Merge tag 'for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset updates from Sebastian Reichel:
 "New drivers:
   - Linear ltc3651 charger driver
   - Motorola CPCAP battery fuel-gauge driver

  New chip/feature support:
   - bq27xxx: prepare for chip data setup
   - axp20x_battery: support max charge current setup

  New core features:
   - add Apple Brick ID type
   - support "supplied-from" device property for generic ACPI/pdata support
   - support strings for sysfs properties representing enums
   - introduce battery-info (backend is DT only for now)
   - provide reboot-mode header globally

  .. and misc fixes"

* tag 'for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (39 commits)
  power: supply: sbs-battery: Don't needlessly set CAPACITY_MODE
  power: supply: sbs-battery: Prevent CAPACITY_MODE races
  power: supply: bq24735: remove incorrect le16_to_cpu calls
  power: supply: sbs-battery: remove incorrect le16_to_cpu calls
  power: supply: cpcap-charger: Add missing power_supply_config
  power: supply: twl4030-charger: move allocation of iio channel to the beginning
  power: supply: twl4030-charger: allocate iio by devm_iio_channel_get() and fix error path
  power: supply: core: constify psy_tcd_ops.
  dt-bindings: power: supply: cpcap-battery: Add power-supplies property
  dt-bindings: power: supply: move max8903-charger.txt to proper location
  dt-bindings: power: supply: move maxim,max14656.txt to proper location
  power: supply: twl4030_charger: Use sysfs_match_string() helper
  power: reset: reboot-mode: Make include file global
  power: supply: axp20x_battery: add DT support for battery max constant charge current
  power: supply: axp20x_battery: add support for DT battery
  power: supply: bq27xxx: Add power_supply_battery_info support
  power: supply: bq27xxx: Add chip data memory read/write support
  power: supply: bq27xxx: Add bulk transfer bus methods
  dt-bindings: power: supply: bq27xxx: Add monitored-battery documentation
  power: supply: core: Add power_supply_prop_precharge
  ...

Documentation/ABI/testing/sysfs-class-power-twl4030

@@ -1,20 +1,3 @@
-What: /sys/class/power_supply/twl4030_ac/max_current
-      /sys/class/power_supply/twl4030_usb/max_current
-Description:
-	Read/Write limit on current which may
-	be drawn from the ac (Accessory Charger) or
-	USB port.
-
-	Value is in micro-Amps.
-
-	Value is set automatically to an appropriate
-	value when a cable is plugged or unplugged.
-
-	Value can the set by writing to the attribute.
-	The change will only persist until the next
-	plug event.  These event are reported via udev.
-
-
 What: /sys/class/power_supply/twl4030_usb/mode
 Description:
 	Changing mode for USB port.

Documentation/devicetree/bindings/power/supply/battery.txt

@@ -0,0 +1,57 @@
+Battery Characteristics
+
+The devicetree battery node provides static battery characteristics.
+In smart batteries, these are typically stored in non-volatile memory
+on a fuel gauge chip. The battery node should be used where there is
+no appropriate non-volatile memory, or it is unprogrammed/incorrect.
+
+Upstream dts files should not include battery nodes, unless the battery
+represented cannot easily be replaced in the system by one of a
+different type. This prevents unpredictable, potentially harmful,
+behavior should a replacement that changes the battery type occur
+without a corresponding update to the dtb.
+
+Required Properties:
+ - compatible: Must be "simple-battery"
+
+Optional Properties:
+ - voltage-min-design-microvolt: drained battery voltage
+ - energy-full-design-microwatt-hours: battery design energy
+ - charge-full-design-microamp-hours: battery design capacity
+ - precharge-current-microamp: current for pre-charge phase
+ - charge-term-current-microamp: current for charge termination phase
+ - constant-charge-current-max-microamp: maximum constant input current
+ - constant-charge-voltage-max-microvolt: maximum constant input voltage
+
+Battery properties are named, where possible, for the corresponding
+elements in enum power_supply_property, defined in
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h
+
+Batteries must be referenced by chargers and/or fuel-gauges
+using a phandle. The phandle's property should be named
+"monitored-battery".
+
+Example:
+
+	bat: battery {
+		compatible = "simple-battery";
+		voltage-min-design-microvolt = <3200000>;
+		energy-full-design-microwatt-hours = <5290000>;
+		charge-full-design-microamp-hours = <1430000>;
+		precharge-current-microamp = <256000>;
+		charge-term-current-microamp = <128000>;
+		constant-charge-current-max-microamp = <900000>;
+		constant-charge-voltage-max-microvolt = <4200000>;
+	};
+
+	charger: charger@11 {
+		....
+		monitored-battery = <&bat>;
+		...
+	};
+
+	fuel_gauge: fuel-gauge@22 {
+		....
+		monitored-battery = <&bat>;
+		...
+	};

Documentation/devicetree/bindings/power/supply/bq27xxx.txt

@@ -1,7 +1,7 @@
-Binding for TI BQ27XXX fuel gauge family
+TI BQ27XXX fuel gauge family
 
 Required properties:
-- compatible: Should contain one of the following:
+- compatible: contains one of the following:
  * "ti,bq27200" - BQ27200
  * "ti,bq27210" - BQ27210
  * "ti,bq27500" - deprecated, use revision specific property below
@@ -26,11 +26,28 @@ Required properties:
  * "ti,bq27425" - BQ27425
  * "ti,bq27441" - BQ27441
  * "ti,bq27621" - BQ27621
-- reg: integer, i2c address of the device.
+- reg: integer, I2C address of the fuel gauge.
+
+Optional properties:
+- monitored-battery: phandle of battery characteristics node
+    The fuel gauge uses the following battery properties:
+    + energy-full-design-microwatt-hours
+    + charge-full-design-microamp-hours
+    + voltage-min-design-microvolt
+  Both or neither of the *-full-design-*-hours properties must be set.
+  See Documentation/devicetree/bindings/power/supply/battery.txt
 
 Example:
 
-bq27510g3 {
-    compatible = "ti,bq27510g3";
-    reg = <0x55>;
-};
+	bat: battery {
+		compatible = "simple-battery";
+		voltage-min-design-microvolt = <3200000>;
+		energy-full-design-microwatt-hours = <5290000>;
+		charge-full-design-microamp-hours = <1430000>;
+	};
+
+	bq27510g3: fuel-gauge@55 {
+		compatible = "ti,bq27510g3";
+		reg = <0x55>;
+		monitored-battery = <&bat>;
+	};

Documentation/devicetree/bindings/power/supply/cpcap-battery.txt

@@ -0,0 +1,31 @@
+Motorola CPCAP PMIC battery driver binding
+
+Required properties:
+- compatible: Shall be "motorola,cpcap-battery"
+- interrupts: Interrupt specifier for each name in interrupt-names
+- interrupt-names: Should contain the following entries:
+		   "lowbph", "lowbpl", "chrgcurr1", "battdetb"
+- io-channels: IIO ADC channel specifier for each name in io-channel-names
+- io-channel-names: Should contain the following entries:
+		    "battdetb", "battp", "chg_isense", "batti"
+- power-supplies: List of phandles for power-supplying devices, as
+		  described in power_supply.txt. Typically a reference
+		  to cpcap_charger.
+
+Example:
+
+cpcap_battery: battery {
+	compatible = "motorola,cpcap-battery";
+	interrupts-extended = <
+		&cpcap 5 0 &cpcap 3 0
+		&cpcap 20 0 &cpcap 54 0
+	>;
+	interrupt-names =
+		"lowbph", "lowbpl",
+		"chrgcurr1", "battdetb";
+	io-channels = <&cpcap_adc 0 &cpcap_adc 1
+		       &cpcap_adc 5 &cpcap_adc 6>;
+	io-channel-names = "battdetb", "battp",
+			   "chg_isense", "batti";
+	power-supplies = <&cpcap_charger>;
+};

Documentation/devicetree/bindings/power/supply/ltc3651-charger.txt

@@ -0,0 +1,27 @@
+ltc3651-charger
+
+Required properties:
+ - compatible: "lltc,ltc3651-charger"
+ - lltc,acpr-gpios: Connect to ACPR output. See remark below.
+
+Optional properties:
+ - lltc,fault-gpios: Connect to FAULT output. See remark below.
+ - lltc,chrg-gpios: Connect to CHRG output. See remark below.
+
+The ltc3651 outputs are open-drain type and active low. The driver assumes the
+GPIO reports "active" when the output is asserted, so if the pins have been
+connected directly, the GPIO flags should be set to active low also.
+
+The driver will attempt to aquire interrupts for all GPIOs to detect changes in
+line state. If the system is not capabale of providing interrupts, the driver
+cannot report changes and userspace will need to periodically read the sysfs
+attributes to detect changes.
+
+Example:
+
+	charger: battery-charger {
+		compatible = "lltc,ltc3651-charger";
+		lltc,acpr-gpios = <&gpio0 68 GPIO_ACTIVE_LOW>;
+		lltc,fault-gpios = <&gpio0 64 GPIO_ACTIVE_LOW>;
+		lltc,chrg-gpios = <&gpio0 63 GPIO_ACTIVE_LOW>;
+	};

Documentation/devicetree/bindings/property-units.txt

@@ -25,8 +25,10 @@ Distance
 Electricity
 ----------------------------------------
 -microamp	: micro amps
+-microamp-hours : micro amp-hours
 -ohms		: Ohms
 -micro-ohms	: micro Ohms
+-microwatt-hours: micro Watt-hours
 -microvolt	: micro volts
 
 Temperature

Documentation/power/power_supply_class.txt

@@ -115,28 +115,33 @@ of charge when battery became full/empty". It also could mean "value of
 charge when battery considered full/empty at given conditions (temperature,
 age)". I.e. these attributes represents real thresholds, not design values.
 
+ENERGY_FULL, ENERGY_EMPTY - same as above but for energy.
+
 CHARGE_COUNTER - the current charge counter (in µAh).  This could easily
 be negative; there is no empty or full value.  It is only useful for
 relative, time-based measurements.
 
+PRECHARGE_CURRENT - the maximum charge current during precharge phase
+of charge cycle (typically 20% of battery capacity).
+CHARGE_TERM_CURRENT - Charge termination current. The charge cycle
+terminates when battery voltage is above recharge threshold, and charge
+current is below this setting (typically 10% of battery capacity).
+
 CONSTANT_CHARGE_CURRENT - constant charge current programmed by charger.
 CONSTANT_CHARGE_CURRENT_MAX - maximum charge current supported by the
 power supply object.
-INPUT_CURRENT_LIMIT - input current limit programmed by charger. Indicates
-the current drawn from a charging source.
-CHARGE_TERM_CURRENT - Charge termination current used to detect the end of charge
-condition.
-
-CALIBRATE - battery or coulomb counter calibration status
 
 CONSTANT_CHARGE_VOLTAGE - constant charge voltage programmed by charger.
 CONSTANT_CHARGE_VOLTAGE_MAX - maximum charge voltage supported by the
 power supply object.
 
+INPUT_CURRENT_LIMIT - input current limit programmed by charger. Indicates
+the current drawn from a charging source.
+
 CHARGE_CONTROL_LIMIT - current charge control limit setting
 CHARGE_CONTROL_LIMIT_MAX - maximum charge control limit setting
 
-ENERGY_FULL, ENERGY_EMPTY - same as above but for energy.
+CALIBRATE - battery or coulomb counter calibration status
 
 CAPACITY - capacity in percents.
 CAPACITY_ALERT_MIN - minimum capacity alert value in percents.
@@ -174,6 +179,18 @@ issued by external power supply will notify supplicants via
 external_power_changed callback.
 
 
+Devicetree battery characteristics
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Drivers should call power_supply_get_battery_info() to obtain battery
+characteristics from a devicetree battery node, defined in
+Documentation/devicetree/bindings/power/supply/battery.txt. This is
+implemented in drivers/power/supply/bq27xxx_battery.c.
+
+Properties in struct power_supply_battery_info and their counterparts in the
+battery node have names corresponding to elements in enum power_supply_property,
+for naming consistency between sysfs attributes and battery node properties.
+
+
 QA
 ~~
 Q: Where is POWER_SUPPLY_PROP_XYZ attribute?

drivers/power/reset/Kconfig

@@ -58,9 +58,9 @@ config POWER_RESET_BRCMKONA
 
 config POWER_RESET_BRCMSTB
 	bool "Broadcom STB reset driver"
-	depends on ARM || MIPS || COMPILE_TEST
+	depends on ARM || ARM64 || MIPS || COMPILE_TEST
 	depends on MFD_SYSCON
-	default ARCH_BRCMSTB
+	default ARCH_BRCMSTB || BMIPS_GENERIC
 	help
 	  This driver provides restart support for Broadcom STB boards.
 

drivers/power/reset/at91-poweroff.c

@@ -97,7 +97,7 @@ static void at91_lpddr_poweroff(void)
 		  "r" cpu_to_le32(AT91_DDRSDRC_LPDDR2_PWOFF),
 		  "r" (at91_shdwc_base),
 		  "r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW)
-		: "r0");
+		: "r6");
 }
 
 static int at91_poweroff_get_wakeup_mode(struct device_node *np)

drivers/power/reset/at91-sama5d2_shdwc.c

@@ -132,7 +132,7 @@ static void at91_lpddr_poweroff(void)
 		  "r" cpu_to_le32(AT91_DDRSDRC_LPDDR2_PWOFF),
 		  "r" (at91_shdwc->at91_shdwc_base),
 		  "r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW)
-		: "r0");
+		: "r6");
 }
 
 static u32 at91_shdwc_debouncer_value(struct platform_device *pdev,

drivers/power/reset/reboot-mode.c

@@ -13,7 +13,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/reboot.h>
-#include "reboot-mode.h"
+#include <linux/reboot-mode.h>
 
 #define PREFIX "mode-"
 

drivers/power/reset/syscon-reboot-mode.c

@@ -15,7 +15,7 @@
 #include <linux/reboot.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
-#include "reboot-mode.h"
+#include <linux/reboot-mode.h>
 
 struct syscon_reboot_mode {
 	struct regmap *map;

drivers/power/supply/Kconfig

@@ -82,6 +82,14 @@ config BATTERY_ACT8945A
 	  Say Y here to enable support for power supply provided by
 	  Active-semi ActivePath ACT8945A charger.
 
+config BATTERY_CPCAP
+	tristate "Motorola CPCAP PMIC battery driver"
+	depends on MFD_CPCAP && IIO
+	default MFD_CPCAP
+	help
+	  Say Y here to enable support for battery on Motorola
+	  phones and tablets such as droid 4.
+
 config BATTERY_DS2760
 	tristate "DS2760 battery driver (HP iPAQ & others)"
 	depends on W1 && W1_SLAVE_DS2760
@@ -190,6 +198,17 @@ config BATTERY_BQ27XXX_I2C
 	  Say Y here to enable support for batteries with BQ27xxx chips
 	  connected over an I2C bus.
 
+config BATTERY_BQ27XXX_DT_UPDATES_NVM
+	bool "BQ27xxx support for update of NVM/flash data memory"
+	depends on BATTERY_BQ27XXX_I2C
+	help
+	  Say Y here to enable devicetree monitored-battery config to update
+	  NVM/flash data memory. Only enable this option for devices with a
+	  fuel gauge mounted on the circuit board, and a battery that cannot
+	  easily be replaced with one of a different type. Not for
+	  general-purpose kernels, as this can cause misconfiguration of a
+	  smart battery with embedded NVM/flash.
+
 config BATTERY_DA9030
 	tristate "DA9030 battery driver"
 	depends on PMIC_DA903X
@@ -408,6 +427,13 @@ config CHARGER_MANAGER
           runtime and in suspend-to-RAM by waking up the system periodically
           with help of suspend_again support.
 
+config CHARGER_LTC3651
+	tristate "LTC3651 charger"
+	depends on GPIOLIB
+	help
+	  Say Y to include support for the LTC3651 battery charger which reports
+	  its status via GPIO lines.
+
 config CHARGER_MAX14577
 	tristate "Maxim MAX14577/77836 battery charger driver"
 	depends on MFD_MAX14577

drivers/power/supply/Makefile

@@ -20,6 +20,7 @@ obj-$(CONFIG_BATTERY_88PM860X)	+= 88pm860x_battery.o
 obj-$(CONFIG_BATTERY_ACT8945A)	+= act8945a_charger.o
 obj-$(CONFIG_BATTERY_AXP20X)	+= axp20x_battery.o
 obj-$(CONFIG_CHARGER_AXP20X)	+= axp20x_ac_power.o
+obj-$(CONFIG_BATTERY_CPCAP)	+= cpcap-battery.o
 obj-$(CONFIG_BATTERY_DS2760)	+= ds2760_battery.o
 obj-$(CONFIG_BATTERY_DS2780)	+= ds2780_battery.o
 obj-$(CONFIG_BATTERY_DS2781)	+= ds2781_battery.o
@@ -61,6 +62,7 @@ obj-$(CONFIG_CHARGER_LP8727)	+= lp8727_charger.o
 obj-$(CONFIG_CHARGER_LP8788)	+= lp8788-charger.o
 obj-$(CONFIG_CHARGER_GPIO)	+= gpio-charger.o
 obj-$(CONFIG_CHARGER_MANAGER)	+= charger-manager.o
+obj-$(CONFIG_CHARGER_LTC3651)	+= ltc3651-charger.o
 obj-$(CONFIG_CHARGER_MAX14577)	+= max14577_charger.o
 obj-$(CONFIG_CHARGER_DETECTOR_MAX14656)	+= max14656_charger_detector.o
 obj-$(CONFIG_CHARGER_MAX77693)	+= max77693_charger.o

drivers/power/supply/axp20x_battery.c

@@ -60,6 +60,8 @@ struct axp20x_batt_ps {
 	struct iio_channel *batt_chrg_i;
 	struct iio_channel *batt_dischrg_i;
 	struct iio_channel *batt_v;
+	/* Maximum constant charge current */
+	unsigned int max_ccc;
 	u8 axp_id;
 };
 
@@ -129,6 +131,14 @@ static void raw_to_constant_charge_current(struct axp20x_batt_ps *axp, int *val)
 		*val = *val * 150000 + 300000;
 }
 
+static void constant_charge_current_to_raw(struct axp20x_batt_ps *axp, int *val)
+{
+	if (axp->axp_id == AXP209_ID)
+		*val = (*val - 300000) / 100000;
+	else
+		*val = (*val - 300000) / 150000;
+}
+
 static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
 					      int *val)
 {
@@ -221,9 +231,7 @@ static int axp20x_battery_get_prop(struct power_supply *psy,
 		break;
 
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
-		val->intval = AXP20X_CHRG_CTRL1_TGT_CURR;
-		raw_to_constant_charge_current(axp20x_batt, &val->intval);
-
+		val->intval = axp20x_batt->max_ccc;
 		break;
 
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
@@ -340,10 +348,10 @@ static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
 					      int charge_current)
 {
-	if (axp_batt->axp_id == AXP209_ID)
-		charge_current = (charge_current - 300000) / 100000;
-	else
-		charge_current = (charge_current - 300000) / 150000;
+	if (charge_current > axp_batt->max_ccc)
+		return -EINVAL;
+
+	constant_charge_current_to_raw(axp_batt, &charge_current);
 
 	if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
 		return -EINVAL;
@@ -352,6 +360,36 @@ static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
 				  AXP20X_CHRG_CTRL1_TGT_CURR, charge_current);
 }
 
+static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp,
+						  int charge_current)
+{
+	bool lower_max = false;
+
+	constant_charge_current_to_raw(axp, &charge_current);
+
+	if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
+		return -EINVAL;
+
+	raw_to_constant_charge_current(axp, &charge_current);
+
+	if (charge_current > axp->max_ccc)
+		dev_warn(axp->dev,
+			 "Setting max constant charge current higher than previously defined. Note that increasing the constant charge current may damage your battery.\n");
+	else
+		lower_max = true;
+
+	axp->max_ccc = charge_current;
+
+	if (lower_max) {
+		int current_cc;
+
+		axp20x_get_constant_charge_current(axp, &current_cc);
+		if (current_cc > charge_current)
+			axp20x_set_constant_charge_current(axp, charge_current);
+	}
+
+	return 0;
+}
 static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt,
 					 int min_voltage)
 {
@@ -380,6 +418,9 @@ static int axp20x_battery_set_prop(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 		return axp20x_set_constant_charge_current(axp20x_batt,
 							  val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		return axp20x_set_max_constant_charge_current(axp20x_batt,
+							      val->intval);
 
 	default:
 		return -EINVAL;
@@ -405,7 +446,8 @@ static int axp20x_battery_prop_writeable(struct power_supply *psy,
 {
 	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
 	       psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN ||
-	       psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT;
+	       psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
+	       psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
 }
 
 static const struct power_supply_desc axp20x_batt_ps_desc = {
@@ -433,6 +475,7 @@ static int axp20x_power_probe(struct platform_device *pdev)
 {
 	struct axp20x_batt_ps *axp20x_batt;
 	struct power_supply_config psy_cfg = {};
+	struct power_supply_battery_info info;
 
 	if (!of_device_is_available(pdev->dev.of_node))
 		return -ENODEV;
@@ -484,6 +527,35 @@ static int axp20x_power_probe(struct platform_device *pdev)
 		return PTR_ERR(axp20x_batt->batt);
 	}
 
+	if (!power_supply_get_battery_info(axp20x_batt->batt, &info)) {
+		int vmin = info.voltage_min_design_uv;
+		int ccc = info.constant_charge_current_max_ua;
+
+		if (vmin > 0 && axp20x_set_voltage_min_design(axp20x_batt,
+							      vmin))
+			dev_err(&pdev->dev,
+				"couldn't set voltage_min_design\n");
+
+		/* Set max to unverified value to be able to set CCC */
+		axp20x_batt->max_ccc = ccc;
+
+		if (ccc <= 0 || axp20x_set_constant_charge_current(axp20x_batt,
+								   ccc)) {
+			dev_err(&pdev->dev,
+				"couldn't set constant charge current from DT: fallback to minimum value\n");
+			ccc = 300000;
+			axp20x_batt->max_ccc = ccc;
+			axp20x_set_constant_charge_current(axp20x_batt, ccc);
+		}
+	}
+
+	/*
+	 * Update max CCC to a valid value if battery info is present or set it
+	 * to current register value by default.
+	 */
+	axp20x_get_constant_charge_current(axp20x_batt,
+					   &axp20x_batt->max_ccc);
+
 	return 0;
 }
 

drivers/power/supply/axp20x_usb_power.c

@@ -339,7 +339,7 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 		"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
 	static const char * const axp22x_irq_names[] = {
 		"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
-	static const char * const *irq_names;
+	const char * const *irq_names;
 	const struct power_supply_desc *usb_power_desc;
 	int i, irq, ret;
 

drivers/power/supply/bq24735-charger.c

@@ -81,14 +81,12 @@ static int bq24735_charger_property_is_writeable(struct power_supply *psy,
 static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
 				     u16 value)
 {
-	return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value));
+	return i2c_smbus_write_word_data(client, reg, value);
 }
 
 static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
 {
-	s32 ret = i2c_smbus_read_word_data(client, reg);
-
-	return ret < 0 ? ret : le16_to_cpu(ret);
+	return i2c_smbus_read_word_data(client, reg);
 }
 
 static int bq24735_update_word(struct i2c_client *client, u8 reg,

drivers/power/supply/bq27xxx_battery.c

@@ -5,6 +5,7 @@
  * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
  * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
  * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
+ * Copyright (C) 2017 Liam Breck <kernel@networkimprov.net>
  *
  * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
  *
@@ -65,6 +66,7 @@
 #define BQ27XXX_FLAG_DSC	BIT(0)
 #define BQ27XXX_FLAG_SOCF	BIT(1) /* State-of-Charge threshold final */
 #define BQ27XXX_FLAG_SOC1	BIT(2) /* State-of-Charge threshold 1 */
+#define BQ27XXX_FLAG_CFGUP	BIT(4)
 #define BQ27XXX_FLAG_FC		BIT(9)
 #define BQ27XXX_FLAG_OTD	BIT(14)
 #define BQ27XXX_FLAG_OTC	BIT(15)
@@ -78,6 +80,12 @@
 #define BQ27000_FLAG_FC		BIT(5)
 #define BQ27000_FLAG_CHGS	BIT(7) /* Charge state flag */
 
+/* control register params */
+#define BQ27XXX_SEALED			0x20
+#define BQ27XXX_SET_CFGUPDATE		0x13
+#define BQ27XXX_SOFT_RESET		0x42
+#define BQ27XXX_RESET			0x41
+
 #define BQ27XXX_RS			(20) /* Resistor sense mOhm */
 #define BQ27XXX_POWER_CONSTANT		(29200) /* 29.2 µV^2 * 1000 */
 #define BQ27XXX_CURRENT_CONSTANT	(3570) /* 3.57 µV * 1000 */
@@ -108,9 +116,21 @@ enum bq27xxx_reg_index {
 	BQ27XXX_REG_SOC,	/* State-of-Charge */
 	BQ27XXX_REG_DCAP,	/* Design Capacity */
 	BQ27XXX_REG_AP,		/* Average Power */
+	BQ27XXX_DM_CTRL,	/* Block Data Control */
+	BQ27XXX_DM_CLASS,	/* Data Class */
+	BQ27XXX_DM_BLOCK,	/* Data Block */
+	BQ27XXX_DM_DATA,	/* Block Data */
+	BQ27XXX_DM_CKSUM,	/* Block Data Checksum */
 	BQ27XXX_REG_MAX,	/* sentinel */
 };
 
+#define BQ27XXX_DM_REG_ROWS \
+	[BQ27XXX_DM_CTRL] = 0x61,  \
+	[BQ27XXX_DM_CLASS] = 0x3e, \
+	[BQ27XXX_DM_BLOCK] = 0x3f, \
+	[BQ27XXX_DM_DATA] = 0x40,  \
+	[BQ27XXX_DM_CKSUM] = 0x60
+
 /* Register mappings */
 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 	[BQ27000] = {
@@ -131,6 +151,11 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x0b,
 		[BQ27XXX_REG_DCAP] = 0x76,
 		[BQ27XXX_REG_AP] = 0x24,
+		[BQ27XXX_DM_CTRL] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_CLASS] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_BLOCK] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_DATA] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
 	},
 	[BQ27010] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -150,6 +175,11 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x0b,
 		[BQ27XXX_REG_DCAP] = 0x76,
 		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_CTRL] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_CLASS] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_BLOCK] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_DATA] = INVALID_REG_ADDR,
+		[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
 	},
 	[BQ2750X] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -169,6 +199,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ2751X] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -188,6 +219,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x20,
 		[BQ27XXX_REG_DCAP] = 0x2e,
 		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27500] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -207,6 +239,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27510G1] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -226,6 +259,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27510G2] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -245,6 +279,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27510G3] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -264,6 +299,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x20,
 		[BQ27XXX_REG_DCAP] = 0x2e,
 		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27520G1] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -283,6 +319,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27520G2] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -302,6 +339,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27520G3] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -321,6 +359,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27520G4] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -340,6 +379,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x20,
 		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27530] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -359,6 +399,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27541] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -378,6 +419,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27545] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -397,6 +439,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x2c,
 		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 		[BQ27XXX_REG_AP] = 0x24,
+		BQ27XXX_DM_REG_ROWS,
 	},
 	[BQ27421] = {
 		[BQ27XXX_REG_CTRL] = 0x00,
@@ -416,6 +459,7 @@ static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 		[BQ27XXX_REG_SOC] = 0x1c,
 		[BQ27XXX_REG_DCAP] = 0x3c,
 		[BQ27XXX_REG_AP] = 0x18,
+		BQ27XXX_DM_REG_ROWS,
 	},
 };
 
@@ -757,6 +801,73 @@ static struct {
 static DEFINE_MUTEX(bq27xxx_list_lock);
 static LIST_HEAD(bq27xxx_battery_devices);
 
+#define BQ27XXX_MSLEEP(i) usleep_range((i)*1000, (i)*1000+500)
+
+#define BQ27XXX_DM_SZ	32
+
+struct bq27xxx_dm_reg {
+	u8 subclass_id;
+	u8 offset;
+	u8 bytes;
+	u16 min, max;
+};
+
+/**
+ * struct bq27xxx_dm_buf - chip data memory buffer
+ * @class: data memory subclass_id
+ * @block: data memory block number
+ * @data: data from/for the block
+ * @has_data: true if data has been filled by read
+ * @dirty: true if data has changed since last read/write
+ *
+ * Encapsulates info required to manage chip data memory blocks.
+ */
+struct bq27xxx_dm_buf {
+	u8 class;
+	u8 block;
+	u8 data[BQ27XXX_DM_SZ];
+	bool has_data, dirty;
+};
+
+#define BQ27XXX_DM_BUF(di, i) { \
+	.class = (di)->dm_regs[i].subclass_id, \
+	.block = (di)->dm_regs[i].offset / BQ27XXX_DM_SZ, \
+}
+
+static inline u16 *bq27xxx_dm_reg_ptr(struct bq27xxx_dm_buf *buf,
+				      struct bq27xxx_dm_reg *reg)
+{
+	if (buf->class == reg->subclass_id &&
+	    buf->block == reg->offset / BQ27XXX_DM_SZ)
+		return (u16 *) (buf->data + reg->offset % BQ27XXX_DM_SZ);
+
+	return NULL;
+}
+
+enum bq27xxx_dm_reg_id {
+	BQ27XXX_DM_DESIGN_CAPACITY = 0,
+	BQ27XXX_DM_DESIGN_ENERGY,
+	BQ27XXX_DM_TERMINATE_VOLTAGE,
+};
+
+static const char * const bq27xxx_dm_reg_name[] = {
+	[BQ27XXX_DM_DESIGN_CAPACITY] = "design-capacity",
+	[BQ27XXX_DM_DESIGN_ENERGY] = "design-energy",
+	[BQ27XXX_DM_TERMINATE_VOLTAGE] = "terminate-voltage",
+};
+
+
+static bool bq27xxx_dt_to_nvm = true;
+module_param_named(dt_monitored_battery_updates_nvm, bq27xxx_dt_to_nvm, bool, 0444);
+MODULE_PARM_DESC(dt_monitored_battery_updates_nvm,
+	"Devicetree monitored-battery config updates data memory on NVM/flash chips.\n"
+	"Users must set this =0 when installing a different type of battery!\n"
+	"Default is =1."
+#ifndef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
+	"\nSetting this affects future kernel updates, not the current configuration."
+#endif
+);
+
 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 {
 	struct bq27xxx_device_info *di;
@@ -794,11 +905,419 @@ MODULE_PARM_DESC(poll_interval,
 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 			       bool single)
 {
-	/* Reports EINVAL for invalid/missing registers */
+	int ret;
+
+	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
+		return -EINVAL;
+
+	ret = di->bus.read(di, di->regs[reg_index], single);
+	if (ret < 0)
+		dev_dbg(di->dev, "failed to read register 0x%02x (index %d)\n",
+			di->regs[reg_index], reg_index);
+
+	return ret;
+}
+
+static inline int bq27xxx_write(struct bq27xxx_device_info *di, int reg_index,
+				u16 value, bool single)
+{
+	int ret;
+
+	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
+		return -EINVAL;
+
+	if (!di->bus.write)
+		return -EPERM;
+
+	ret = di->bus.write(di, di->regs[reg_index], value, single);
+	if (ret < 0)
+		dev_dbg(di->dev, "failed to write register 0x%02x (index %d)\n",
+			di->regs[reg_index], reg_index);
+
+	return ret;
+}
+
+static inline int bq27xxx_read_block(struct bq27xxx_device_info *di, int reg_index,
+				     u8 *data, int len)
+{
+	int ret;
+
+	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
+		return -EINVAL;
+
+	if (!di->bus.read_bulk)
+		return -EPERM;
+
+	ret = di->bus.read_bulk(di, di->regs[reg_index], data, len);
+	if (ret < 0)
+		dev_dbg(di->dev, "failed to read_bulk register 0x%02x (index %d)\n",
+			di->regs[reg_index], reg_index);
+
+	return ret;
+}
+
+static inline int bq27xxx_write_block(struct bq27xxx_device_info *di, int reg_index,
+				      u8 *data, int len)
+{
+	int ret;
+
 	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 		return -EINVAL;
 
-	return di->bus.read(di, di->regs[reg_index], single);
+	if (!di->bus.write_bulk)
+		return -EPERM;
+
+	ret = di->bus.write_bulk(di, di->regs[reg_index], data, len);
+	if (ret < 0)
+		dev_dbg(di->dev, "failed to write_bulk register 0x%02x (index %d)\n",
+			di->regs[reg_index], reg_index);
+
+	return ret;
+}
+
+static int bq27xxx_battery_seal(struct bq27xxx_device_info *di)
+{
+	int ret;
+
+	ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_SEALED, false);
+	if (ret < 0) {
+		dev_err(di->dev, "bus error on seal: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bq27xxx_battery_unseal(struct bq27xxx_device_info *di)
+{
+	int ret;
+
+	if (di->unseal_key == 0) {
+		dev_err(di->dev, "unseal failed due to missing key\n");
+		return -EINVAL;
+	}
+
+	ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)(di->unseal_key >> 16), false);
+	if (ret < 0)
+		goto out;
+
+	ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)di->unseal_key, false);
+	if (ret < 0)
+		goto out;
+
+	return 0;
+
+out:
+	dev_err(di->dev, "bus error on unseal: %d\n", ret);
+	return ret;
+}
+
+static u8 bq27xxx_battery_checksum_dm_block(struct bq27xxx_dm_buf *buf)
+{
+	u16 sum = 0;
+	int i;
+
+	for (i = 0; i < BQ27XXX_DM_SZ; i++)
+		sum += buf->data[i];
+	sum &= 0xff;
+
+	return 0xff - sum;
+}
+
+static int bq27xxx_battery_read_dm_block(struct bq27xxx_device_info *di,
+					 struct bq27xxx_dm_buf *buf)
+{
+	int ret;
+
+	buf->has_data = false;
+
+	ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
+	if (ret < 0)
+		goto out;
+
+	ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
+	if (ret < 0)
+		goto out;
+
+	BQ27XXX_MSLEEP(1);
+
+	ret = bq27xxx_read_block(di, BQ27XXX_DM_DATA, buf->data, BQ27XXX_DM_SZ);
+	if (ret < 0)
+		goto out;
+
+	ret = bq27xxx_read(di, BQ27XXX_DM_CKSUM, true);
+	if (ret < 0)
+		goto out;
+
+	if ((u8)ret != bq27xxx_battery_checksum_dm_block(buf)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	buf->has_data = true;
+	buf->dirty = false;
+
+	return 0;
+
+out:
+	dev_err(di->dev, "bus error reading chip memory: %d\n", ret);
+	return ret;
+}
+
+static void bq27xxx_battery_update_dm_block(struct bq27xxx_device_info *di,
+					    struct bq27xxx_dm_buf *buf,
+					    enum bq27xxx_dm_reg_id reg_id,
+					    unsigned int val)
+{
+	struct bq27xxx_dm_reg *reg = &di->dm_regs[reg_id];
+	const char *str = bq27xxx_dm_reg_name[reg_id];
+	u16 *prev = bq27xxx_dm_reg_ptr(buf, reg);
+
+	if (prev == NULL) {
+		dev_warn(di->dev, "buffer does not match %s dm spec\n", str);
+		return;
+	}
+
+	if (reg->bytes != 2) {
+		dev_warn(di->dev, "%s dm spec has unsupported byte size\n", str);
+		return;
+	}
+
+	if (!buf->has_data)
+		return;
+
+	if (be16_to_cpup(prev) == val) {
+		dev_info(di->dev, "%s has %u\n", str, val);
+		return;
+	}
+
+#ifdef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
+	if (!di->ram_chip && !bq27xxx_dt_to_nvm) {
+#else
+	if (!di->ram_chip) {
+#endif
+		/* devicetree and NVM differ; defer to NVM */
+		dev_warn(di->dev, "%s has %u; update to %u disallowed "
+#ifdef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
+			 "by dt_monitored_battery_updates_nvm=0"
+#else
+			 "for flash/NVM data memory"
+#endif
+			 "\n", str, be16_to_cpup(prev), val);
+		return;
+	}
+
+	dev_info(di->dev, "update %s to %u\n", str, val);
+
+	*prev = cpu_to_be16(val);
+	buf->dirty = true;
+}
+
+static int bq27xxx_battery_cfgupdate_priv(struct bq27xxx_device_info *di, bool active)
+{
+	const int limit = 100;
+	u16 cmd = active ? BQ27XXX_SET_CFGUPDATE : BQ27XXX_SOFT_RESET;
+	int ret, try = limit;
+
+	ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, cmd, false);
+	if (ret < 0)
+		return ret;
+
+	do {
+		BQ27XXX_MSLEEP(25);
+		ret = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
+		if (ret < 0)
+			return ret;
+	} while (!!(ret & BQ27XXX_FLAG_CFGUP) != active && --try);
+
+	if (!try) {
+		dev_err(di->dev, "timed out waiting for cfgupdate flag %d\n", active);
+		return -EINVAL;
+	}
+
+	if (limit - try > 3)
+		dev_warn(di->dev, "cfgupdate %d, retries %d\n", active, limit - try);
+
+	return 0;
+}
+
+static inline int bq27xxx_battery_set_cfgupdate(struct bq27xxx_device_info *di)
+{
+	int ret = bq27xxx_battery_cfgupdate_priv(di, true);
+	if (ret < 0 && ret != -EINVAL)
+		dev_err(di->dev, "bus error on set_cfgupdate: %d\n", ret);
+
+	return ret;
+}
+
+static inline int bq27xxx_battery_soft_reset(struct bq27xxx_device_info *di)
+{
+	int ret = bq27xxx_battery_cfgupdate_priv(di, false);
+	if (ret < 0 && ret != -EINVAL)
+		dev_err(di->dev, "bus error on soft_reset: %d\n", ret);
+
+	return ret;
+}
+
+static int bq27xxx_battery_write_dm_block(struct bq27xxx_device_info *di,
+					  struct bq27xxx_dm_buf *buf)
+{
+	bool cfgup = di->chip == BQ27421; /* assume related chips need cfgupdate */
+	int ret;
+
+	if (!buf->dirty)
+		return 0;
+
+	if (cfgup) {
+		ret = bq27xxx_battery_set_cfgupdate(di);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = bq27xxx_write(di, BQ27XXX_DM_CTRL, 0, true);
+	if (ret < 0)
+		goto out;
+
+	ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
+	if (ret < 0)
+		goto out;
+
+	ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
+	if (ret < 0)
+		goto out;
+
+	BQ27XXX_MSLEEP(1);
+
+	ret = bq27xxx_write_block(di, BQ27XXX_DM_DATA, buf->data, BQ27XXX_DM_SZ);
+	if (ret < 0)
+		goto out;
+
+	ret = bq27xxx_write(di, BQ27XXX_DM_CKSUM,
+			    bq27xxx_battery_checksum_dm_block(buf), true);
+	if (ret < 0)
+		goto out;
+
+	/* DO NOT read BQ27XXX_DM_CKSUM here to verify it! That may cause NVM
+	 * corruption on the '425 chip (and perhaps others), which can damage
+	 * the chip.
+	 */
+
+	if (cfgup) {
+		BQ27XXX_MSLEEP(1);
+		ret = bq27xxx_battery_soft_reset(di);
+		if (ret < 0)
+			return ret;
+	} else {
+		BQ27XXX_MSLEEP(100); /* flash DM updates in <100ms */
+	}
+
+	buf->dirty = false;
+
+	return 0;
+
+out:
+	if (cfgup)
+		bq27xxx_battery_soft_reset(di);
+
+	dev_err(di->dev, "bus error writing chip memory: %d\n", ret);
+	return ret;
+}
+
+static void bq27xxx_battery_set_config(struct bq27xxx_device_info *di,
+				       struct power_supply_battery_info *info)
+{
+	struct bq27xxx_dm_buf bd = BQ27XXX_DM_BUF(di, BQ27XXX_DM_DESIGN_CAPACITY);
+	struct bq27xxx_dm_buf bt = BQ27XXX_DM_BUF(di, BQ27XXX_DM_TERMINATE_VOLTAGE);
+	bool updated;
+
+	if (bq27xxx_battery_unseal(di) < 0)
+		return;
+
+	if (info->charge_full_design_uah != -EINVAL &&
+	    info->energy_full_design_uwh != -EINVAL) {
+		bq27xxx_battery_read_dm_block(di, &bd);
+		/* assume design energy & capacity are in same block */
+		bq27xxx_battery_update_dm_block(di, &bd,
+					BQ27XXX_DM_DESIGN_CAPACITY,
+					info->charge_full_design_uah / 1000);
+		bq27xxx_battery_update_dm_block(di, &bd,
+					BQ27XXX_DM_DESIGN_ENERGY,
+					info->energy_full_design_uwh / 1000);
+	}
+
+	if (info->voltage_min_design_uv != -EINVAL) {
+		bool same = bd.class == bt.class && bd.block == bt.block;
+		if (!same)
+			bq27xxx_battery_read_dm_block(di, &bt);
+		bq27xxx_battery_update_dm_block(di, same ? &bd : &bt,
+					BQ27XXX_DM_TERMINATE_VOLTAGE,
+					info->voltage_min_design_uv / 1000);
+	}
+
+	updated = bd.dirty || bt.dirty;
+
+	bq27xxx_battery_write_dm_block(di, &bd);
+	bq27xxx_battery_write_dm_block(di, &bt);
+
+	bq27xxx_battery_seal(di);
+
+	if (updated && di->chip != BQ27421) { /* not a cfgupdate chip, so reset */
+		bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_RESET, false);
+		BQ27XXX_MSLEEP(300); /* reset time is not documented */
+	}
+	/* assume bq27xxx_battery_update() is called hereafter */
+}
+
+static void bq27xxx_battery_settings(struct bq27xxx_device_info *di)
+{
+	struct power_supply_battery_info info = {};
+	unsigned int min, max;
+
+	if (power_supply_get_battery_info(di->bat, &info) < 0)
+		return;
+
+	if (!di->dm_regs) {
+		dev_warn(di->dev, "data memory update not supported for chip\n");
+		return;
+	}
+
+	if (info.energy_full_design_uwh != info.charge_full_design_uah) {
+		if (info.energy_full_design_uwh == -EINVAL)
+			dev_warn(di->dev, "missing battery:energy-full-design-microwatt-hours\n");
+		else if (info.charge_full_design_uah == -EINVAL)
+			dev_warn(di->dev, "missing battery:charge-full-design-microamp-hours\n");
+	}
+
+	/* assume min == 0 */
+	max = di->dm_regs[BQ27XXX_DM_DESIGN_ENERGY].max;
+	if (info.energy_full_design_uwh > max * 1000) {
+		dev_err(di->dev, "invalid battery:energy-full-design-microwatt-hours %d\n",
+			info.energy_full_design_uwh);
+		info.energy_full_design_uwh = -EINVAL;
+	}
+
+	/* assume min == 0 */
+	max = di->dm_regs[BQ27XXX_DM_DESIGN_CAPACITY].max;
+	if (info.charge_full_design_uah > max * 1000) {
+		dev_err(di->dev, "invalid battery:charge-full-design-microamp-hours %d\n",
+			info.charge_full_design_uah);
+		info.charge_full_design_uah = -EINVAL;
+	}
+
+	min = di->dm_regs[BQ27XXX_DM_TERMINATE_VOLTAGE].min;
+	max = di->dm_regs[BQ27XXX_DM_TERMINATE_VOLTAGE].max;
+	if ((info.voltage_min_design_uv < min * 1000 ||
+	     info.voltage_min_design_uv > max * 1000) &&
+	     info.voltage_min_design_uv != -EINVAL) {
+		dev_err(di->dev, "invalid battery:voltage-min-design-microvolt %d\n",
+			info.voltage_min_design_uv);
+		info.voltage_min_design_uv = -EINVAL;
+	}
+
+	if ((info.energy_full_design_uwh != -EINVAL &&
+	     info.charge_full_design_uah != -EINVAL) ||
+	     info.voltage_min_design_uv  != -EINVAL)
+		bq27xxx_battery_set_config(di, &info);
 }
 
 /*
@@ -1318,6 +1837,13 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 		ret = bq27xxx_simple_value(di->charge_design_full, val);
 		break;
+	/*
+	 * TODO: Implement these to make registers set from
+	 * power_supply_battery_info visible in sysfs.
+	 */
+	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		return -EINVAL;
 	case POWER_SUPPLY_PROP_CYCLE_COUNT:
 		ret = bq27xxx_simple_value(di->cache.cycle_count, val);
 		break;
@@ -1351,7 +1877,10 @@ static void bq27xxx_external_power_changed(struct power_supply *psy)
 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
 {
 	struct power_supply_desc *psy_desc;
-	struct power_supply_config psy_cfg = { .drv_data = di, };
+	struct power_supply_config psy_cfg = {
+		.of_node = di->dev->of_node,
+		.drv_data = di,
+	};
 
 	INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
 	mutex_init(&di->lock);
@@ -1376,6 +1905,7 @@ int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
 
 	dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 
+	bq27xxx_battery_settings(di);
 	bq27xxx_battery_update(di);
 
 	mutex_lock(&bq27xxx_list_lock);

drivers/power/supply/bq27xxx_battery_i2c.c

@@ -38,7 +38,7 @@ static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
 {
 	struct i2c_client *client = to_i2c_client(di->dev);
 	struct i2c_msg msg[2];
-	unsigned char data[2];
+	u8 data[2];
 	int ret;
 
 	if (!client->adapter)
@@ -68,6 +68,82 @@ static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
 	return ret;
 }
 
+static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
+				     int value, bool single)
+{
+	struct i2c_client *client = to_i2c_client(di->dev);
+	struct i2c_msg msg;
+	u8 data[4];
+	int ret;
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	data[0] = reg;
+	if (single) {
+		data[1] = (u8) value;
+		msg.len = 2;
+	} else {
+		put_unaligned_le16(value, &data[1]);
+		msg.len = 3;
+	}
+
+	msg.buf = data;
+	msg.addr = client->addr;
+	msg.flags = 0;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		return ret;
+	if (ret != 1)
+		return -EINVAL;
+	return 0;
+}
+
+static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
+					 u8 *data, int len)
+{
+	struct i2c_client *client = to_i2c_client(di->dev);
+	int ret;
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
+	if (ret < 0)
+		return ret;
+	if (ret != len)
+		return -EINVAL;
+	return 0;
+}
+
+static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
+					  u8 reg, u8 *data, int len)
+{
+	struct i2c_client *client = to_i2c_client(di->dev);
+	struct i2c_msg msg;
+	u8 buf[33];
+	int ret;
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	buf[0] = reg;
+	memcpy(&buf[1], data, len);
+
+	msg.buf = buf;
+	msg.addr = client->addr;
+	msg.flags = 0;
+	msg.len = len + 1;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		return ret;
+	if (ret != 1)
+		return -EINVAL;
+	return 0;
+}
+
 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
 				     const struct i2c_device_id *id)
 {
@@ -95,7 +171,11 @@ static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
 	di->dev = &client->dev;
 	di->chip = id->driver_data;
 	di->name = name;
+
 	di->bus.read = bq27xxx_battery_i2c_read;
+	di->bus.write = bq27xxx_battery_i2c_write;
+	di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
+	di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
 
 	ret = bq27xxx_battery_setup(di);
 	if (ret)

drivers/power/supply/cpcap-battery.c

@@ -0,0 +1,808 @@
+/*
+ * Battery driver for CPCAP PMIC
+ *
+ * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
+ *
+ * Some parts of the code based on earlie Motorola mapphone Linux kernel
+ * drivers:
+ *
+ * Copyright (C) 2009-2010 Motorola, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/consumer.h>
+#include <linux/iio/types.h>
+#include <linux/mfd/motorola-cpcap.h>
+
+#include <asm/div64.h>
+
+/*
+ * Register bit defines for CPCAP_REG_BPEOL. Some of these seem to
+ * map to MC13783UG.pdf "Table 5-19. Register 13, Power Control 0"
+ * to enable BATTDETEN, LOBAT and EOL features. We currently use
+ * LOBAT interrupts instead of EOL.
+ */
+#define CPCAP_REG_BPEOL_BIT_EOL9	BIT(9)	/* Set for EOL irq */
+#define CPCAP_REG_BPEOL_BIT_EOL8	BIT(8)	/* Set for EOL irq */
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN7	BIT(7)
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN6	BIT(6)
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN5	BIT(5)
+#define CPCAP_REG_BPEOL_BIT_EOL_MULTI	BIT(4)	/* Set for multiple EOL irqs */
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN3	BIT(3)
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN2	BIT(2)
+#define CPCAP_REG_BPEOL_BIT_BATTDETEN	BIT(1)	/* Enable battery detect */
+#define CPCAP_REG_BPEOL_BIT_EOLSEL	BIT(0)	/* BPDET = 0, EOL = 1 */
+
+#define CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS	250
+
+enum {
+	CPCAP_BATTERY_IIO_BATTDET,
+	CPCAP_BATTERY_IIO_VOLTAGE,
+	CPCAP_BATTERY_IIO_CHRG_CURRENT,
+	CPCAP_BATTERY_IIO_BATT_CURRENT,
+	CPCAP_BATTERY_IIO_NR,
+};
+
+enum cpcap_battery_irq_action {
+	CPCAP_BATTERY_IRQ_ACTION_NONE,
+	CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW,
+	CPCAP_BATTERY_IRQ_ACTION_POWEROFF,
+};
+
+struct cpcap_interrupt_desc {
+	const char *name;
+	struct list_head node;
+	int irq;
+	enum cpcap_battery_irq_action action;
+};
+
+struct cpcap_battery_config {
+	int ccm;
+	int cd_factor;
+	struct power_supply_info info;
+};
+
+struct cpcap_coulomb_counter_data {
+	s32 sample;		/* 24-bits */
+	s32 accumulator;
+	s16 offset;		/* 10-bits */
+};
+
+enum cpcap_battery_state {
+	CPCAP_BATTERY_STATE_PREVIOUS,
+	CPCAP_BATTERY_STATE_LATEST,
+	CPCAP_BATTERY_STATE_NR,
+};
+
+struct cpcap_battery_state_data {
+	int voltage;
+	int current_ua;
+	int counter_uah;
+	int temperature;
+	ktime_t time;
+	struct cpcap_coulomb_counter_data cc;
+};
+
+struct cpcap_battery_ddata {
+	struct device *dev;
+	struct regmap *reg;
+	struct list_head irq_list;
+	struct iio_channel *channels[CPCAP_BATTERY_IIO_NR];
+	struct power_supply *psy;
+	struct cpcap_battery_config config;
+	struct cpcap_battery_state_data state[CPCAP_BATTERY_STATE_NR];
+	atomic_t active;
+	int status;
+	u16 vendor;
+};
+
+#define CPCAP_NO_BATTERY	-400
+
+static struct cpcap_battery_state_data *
+cpcap_battery_get_state(struct cpcap_battery_ddata *ddata,
+			enum cpcap_battery_state state)
+{
+	if (state >= CPCAP_BATTERY_STATE_NR)
+		return NULL;
+
+	return &ddata->state[state];
+}
+
+static struct cpcap_battery_state_data *
+cpcap_battery_latest(struct cpcap_battery_ddata *ddata)
+{
+	return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_LATEST);
+}
+
+static struct cpcap_battery_state_data *
+cpcap_battery_previous(struct cpcap_battery_ddata *ddata)
+{
+	return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_PREVIOUS);
+}
+
+static int cpcap_charger_battery_temperature(struct cpcap_battery_ddata *ddata,
+					     int *value)
+{
+	struct iio_channel *channel;
+	int error;
+
+	channel = ddata->channels[CPCAP_BATTERY_IIO_BATTDET];
+	error = iio_read_channel_processed(channel, value);
+	if (error < 0) {
+		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+		*value = CPCAP_NO_BATTERY;
+
+		return error;
+	}
+
+	*value /= 100;
+
+	return 0;
+}
+
+static int cpcap_battery_get_voltage(struct cpcap_battery_ddata *ddata)
+{
+	struct iio_channel *channel;
+	int error, value = 0;
+
+	channel = ddata->channels[CPCAP_BATTERY_IIO_VOLTAGE];
+	error = iio_read_channel_processed(channel, &value);
+	if (error < 0) {
+		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+
+		return 0;
+	}
+
+	return value * 1000;
+}
+
+static int cpcap_battery_get_current(struct cpcap_battery_ddata *ddata)
+{
+	struct iio_channel *channel;
+	int error, value = 0;
+
+	channel = ddata->channels[CPCAP_BATTERY_IIO_BATT_CURRENT];
+	error = iio_read_channel_processed(channel, &value);
+	if (error < 0) {
+		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+
+		return 0;
+	}
+
+	return value * 1000;
+}
+
+/**
+ * cpcap_battery_cc_raw_div - calculate and divide coulomb counter μAms values
+ * @ddata: device driver data
+ * @sample: coulomb counter sample value
+ * @accumulator: coulomb counter integrator value
+ * @offset: coulomb counter offset value
+ * @divider: conversion divider
+ *
+ * Note that cc_lsb and cc_dur values are from Motorola Linux kernel
+ * function data_get_avg_curr_ua() and seem to be based on measured test
+ * results. It also has the following comment:
+ *
+ * Adjustment factors are applied here as a temp solution per the test
+ * results. Need to work out a formal solution for this adjustment.
+ *
+ * A coulomb counter for similar hardware seems to be documented in
+ * "TWL6030 Gas Gauging Basics (Rev. A)" swca095a.pdf in chapter
+ * "10 Calculating Accumulated Current". We however follow what the
+ * Motorola mapphone Linux kernel is doing as there may be either a
+ * TI or ST coulomb counter in the PMIC.
+ */
+static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata,
+				    u32 sample, s32 accumulator,
+				    s16 offset, u32 divider)
+{
+	s64 acc;
+	u64 tmp;
+	int avg_current;
+	u32 cc_lsb;
+
+	sample &= 0xffffff;		/* 24-bits, unsigned */
+	offset &= 0x7ff;		/* 10-bits, signed */
+
+	switch (ddata->vendor) {
+	case CPCAP_VENDOR_ST:
+		cc_lsb = 95374;		/* μAms per LSB */
+		break;
+	case CPCAP_VENDOR_TI:
+		cc_lsb = 91501;		/* μAms per LSB */
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	acc = accumulator;
+	acc = acc - ((s64)sample * offset);
+	cc_lsb = (cc_lsb * ddata->config.cd_factor) / 1000;
+
+	if (acc >=  0)
+		tmp = acc;
+	else
+		tmp = acc * -1;
+
+	tmp = tmp * cc_lsb;
+	do_div(tmp, divider);
+	avg_current = tmp;
+
+	if (acc >= 0)
+		return -avg_current;
+	else
+		return avg_current;
+}
+
+/* 3600000μAms = 1μAh */
+static int cpcap_battery_cc_to_uah(struct cpcap_battery_ddata *ddata,
+				   u32 sample, s32 accumulator,
+				   s16 offset)
+{
+	return cpcap_battery_cc_raw_div(ddata, sample,
+					accumulator, offset,
+					3600000);
+}
+
+static int cpcap_battery_cc_to_ua(struct cpcap_battery_ddata *ddata,
+				  u32 sample, s32 accumulator,
+				  s16 offset)
+{
+	return cpcap_battery_cc_raw_div(ddata, sample,
+					accumulator, offset,
+					sample *
+					CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS);
+}
+
+/**
+ * cpcap_battery_read_accumulated - reads cpcap coulomb counter
+ * @ddata: device driver data
+ * @regs: coulomb counter values
+ *
+ * Based on Motorola mapphone kernel function data_read_regs().
+ * Looking at the registers, the coulomb counter seems similar to
+ * the coulomb counter in TWL6030. See "TWL6030 Gas Gauging Basics
+ * (Rev. A) swca095a.pdf for "10 Calculating Accumulated Current".
+ *
+ * Note that swca095a.pdf instructs to stop the coulomb counter
+ * before reading to avoid values changing. Motorola mapphone
+ * Linux kernel does not do it, so let's assume they've verified
+ * the data produced is correct.
+ */
+static int
+cpcap_battery_read_accumulated(struct cpcap_battery_ddata *ddata,
+			       struct cpcap_coulomb_counter_data *ccd)
+{
+	u16 buf[7];	/* CPCAP_REG_CC1 to CCI */
+	int error;
+
+	ccd->sample = 0;
+	ccd->accumulator = 0;
+	ccd->offset = 0;
+
+	/* Read coulomb counter register range */
+	error = regmap_bulk_read(ddata->reg, CPCAP_REG_CCS1,
+				 buf, ARRAY_SIZE(buf));
+	if (error)
+		return 0;
+
+	/* Sample value CPCAP_REG_CCS1 & 2 */
+	ccd->sample = (buf[1] & 0x0fff) << 16;
+	ccd->sample |= buf[0];
+
+	/* Accumulator value CPCAP_REG_CCA1 & 2 */
+	ccd->accumulator = ((s16)buf[3]) << 16;
+	ccd->accumulator |= buf[2];
+
+	/* Offset value CPCAP_REG_CCO */
+	ccd->offset = buf[5];
+
+	/* Adjust offset based on mode value CPCAP_REG_CCM? */
+	if (buf[4] >= 0x200)
+		ccd->offset |= 0xfc00;
+
+	return cpcap_battery_cc_to_uah(ddata,
+				       ccd->sample,
+				       ccd->accumulator,
+				       ccd->offset);
+}
+
+/**
+ * cpcap_battery_cc_get_avg_current - read cpcap coulumb counter
+ * @ddata: cpcap battery driver device data
+ */
+static int cpcap_battery_cc_get_avg_current(struct cpcap_battery_ddata *ddata)
+{
+	int value, acc, error;
+	s32 sample = 1;
+	s16 offset;
+
+	if (ddata->vendor == CPCAP_VENDOR_ST)
+		sample = 4;
+
+	/* Coulomb counter integrator */
+	error = regmap_read(ddata->reg, CPCAP_REG_CCI, &value);
+	if (error)
+		return error;
+
+	if ((ddata->vendor == CPCAP_VENDOR_TI) && (value > 0x2000))
+		value = value | 0xc000;
+
+	acc = (s16)value;
+
+	/* Coulomb counter sample time */
+	error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
+	if (error)
+		return error;
+
+	if (value < 0x200)
+		offset = value;
+	else
+		offset = value | 0xfc00;
+
+	return cpcap_battery_cc_to_ua(ddata, sample, acc, offset);
+}
+
+static bool cpcap_battery_full(struct cpcap_battery_ddata *ddata)
+{
+	struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
+
+	/* Basically anything that measures above 4347000 is full */
+	if (state->voltage >= (ddata->config.info.voltage_max_design - 4000))
+		return true;
+
+	return false;
+}
+
+static int cpcap_battery_update_status(struct cpcap_battery_ddata *ddata)
+{
+	struct cpcap_battery_state_data state, *latest, *previous;
+	ktime_t now;
+	int error;
+
+	memset(&state, 0, sizeof(state));
+	now = ktime_get();
+
+	latest = cpcap_battery_latest(ddata);
+	if (latest) {
+		s64 delta_ms = ktime_to_ms(ktime_sub(now, latest->time));
+
+		if (delta_ms < CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS)
+			return delta_ms;
+	}
+
+	state.time = now;
+	state.voltage = cpcap_battery_get_voltage(ddata);
+	state.current_ua = cpcap_battery_get_current(ddata);
+	state.counter_uah = cpcap_battery_read_accumulated(ddata, &state.cc);
+
+	error = cpcap_charger_battery_temperature(ddata,
+						  &state.temperature);
+	if (error)
+		return error;
+
+	previous = cpcap_battery_previous(ddata);
+	memcpy(previous, latest, sizeof(*previous));
+	memcpy(latest, &state, sizeof(*latest));
+
+	return 0;
+}
+
+static enum power_supply_property cpcap_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_COUNTER,
+	POWER_SUPPLY_PROP_POWER_NOW,
+	POWER_SUPPLY_PROP_POWER_AVG,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_SCOPE,
+	POWER_SUPPLY_PROP_TEMP,
+};
+
+static int cpcap_battery_get_property(struct power_supply *psy,
+				      enum power_supply_property psp,
+				      union power_supply_propval *val)
+{
+	struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
+	struct cpcap_battery_state_data *latest, *previous;
+	u32 sample;
+	s32 accumulator;
+	int cached;
+	s64 tmp;
+
+	cached = cpcap_battery_update_status(ddata);
+	if (cached < 0)
+		return cached;
+
+	latest = cpcap_battery_latest(ddata);
+	previous = cpcap_battery_previous(ddata);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+		if (latest->temperature > CPCAP_NO_BATTERY)
+			val->intval = 1;
+		else
+			val->intval = 0;
+		break;
+	case POWER_SUPPLY_PROP_STATUS:
+		if (cpcap_battery_full(ddata)) {
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+			break;
+		}
+		if (cpcap_battery_cc_get_avg_current(ddata) < 0)
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		else
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = ddata->config.info.technology;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = cpcap_battery_get_voltage(ddata);
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		val->intval = ddata->config.info.voltage_max_design;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = ddata->config.info.voltage_min_design;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		if (cached) {
+			val->intval = cpcap_battery_cc_get_avg_current(ddata);
+			break;
+		}
+		sample = latest->cc.sample - previous->cc.sample;
+		accumulator = latest->cc.accumulator - previous->cc.accumulator;
+		val->intval = cpcap_battery_cc_to_ua(ddata, sample,
+						     accumulator,
+						     latest->cc.offset);
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		val->intval = latest->current_ua;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+		val->intval = latest->counter_uah;
+		break;
+	case POWER_SUPPLY_PROP_POWER_NOW:
+		tmp = (latest->voltage / 10000) * latest->current_ua;
+		val->intval = div64_s64(tmp, 100);
+		break;
+	case POWER_SUPPLY_PROP_POWER_AVG:
+		if (cached) {
+			tmp = cpcap_battery_cc_get_avg_current(ddata);
+			tmp *= (latest->voltage / 10000);
+			val->intval = div64_s64(tmp, 100);
+			break;
+		}
+		sample = latest->cc.sample - previous->cc.sample;
+		accumulator = latest->cc.accumulator - previous->cc.accumulator;
+		tmp = cpcap_battery_cc_to_ua(ddata, sample, accumulator,
+					     latest->cc.offset);
+		tmp *= ((latest->voltage + previous->voltage) / 20000);
+		val->intval = div64_s64(tmp, 100);
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+		if (cpcap_battery_full(ddata))
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+		else if (latest->voltage >= 3750000)
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
+		else if (latest->voltage >= 3300000)
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+		else if (latest->voltage > 3100000)
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+		else if (latest->voltage <= 3100000)
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+		else
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+		val->intval = ddata->config.info.charge_full_design;
+		break;
+	case POWER_SUPPLY_PROP_SCOPE:
+		val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		val->intval = latest->temperature;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
+{
+	struct cpcap_battery_ddata *ddata = data;
+	struct cpcap_battery_state_data *latest;
+	struct cpcap_interrupt_desc *d;
+
+	if (!atomic_read(&ddata->active))
+		return IRQ_NONE;
+
+	list_for_each_entry(d, &ddata->irq_list, node) {
+		if (irq == d->irq)
+			break;
+	}
+
+	if (!d)
+		return IRQ_NONE;
+
+	latest = cpcap_battery_latest(ddata);
+
+	switch (d->action) {
+	case CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW:
+		if (latest->counter_uah >= 0)
+			dev_warn(ddata->dev, "Battery low at 3.3V!\n");
+		break;
+	case CPCAP_BATTERY_IRQ_ACTION_POWEROFF:
+		if (latest->counter_uah >= 0) {
+			dev_emerg(ddata->dev,
+				  "Battery empty at 3.1V, powering off\n");
+			orderly_poweroff(true);
+		}
+		break;
+	default:
+		break;
+	}
+
+	power_supply_changed(ddata->psy);
+
+	return IRQ_HANDLED;
+}
+
+static int cpcap_battery_init_irq(struct platform_device *pdev,
+				  struct cpcap_battery_ddata *ddata,
+				  const char *name)
+{
+	struct cpcap_interrupt_desc *d;
+	int irq, error;
+
+	irq = platform_get_irq_byname(pdev, name);
+	if (!irq)
+		return -ENODEV;
+
+	error = devm_request_threaded_irq(ddata->dev, irq, NULL,
+					  cpcap_battery_irq_thread,
+					  IRQF_SHARED,
+					  name, ddata);
+	if (error) {
+		dev_err(ddata->dev, "could not get irq %s: %i\n",
+			name, error);
+
+		return error;
+	}
+
+	d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
+	if (!d)
+		return -ENOMEM;
+
+	d->name = name;
+	d->irq = irq;
+
+	if (!strncmp(name, "lowbph", 6))
+		d->action = CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW;
+	else if (!strncmp(name, "lowbpl", 6))
+		d->action = CPCAP_BATTERY_IRQ_ACTION_POWEROFF;
+
+	list_add(&d->node, &ddata->irq_list);
+
+	return 0;
+}
+
+static int cpcap_battery_init_interrupts(struct platform_device *pdev,
+					 struct cpcap_battery_ddata *ddata)
+{
+	const char * const cpcap_battery_irqs[] = {
+		"eol", "lowbph", "lowbpl",
+		"chrgcurr1", "battdetb"
+	};
+	int i, error;
+
+	for (i = 0; i < ARRAY_SIZE(cpcap_battery_irqs); i++) {
+		error = cpcap_battery_init_irq(pdev, ddata,
+					       cpcap_battery_irqs[i]);
+		if (error)
+			return error;
+	}
+
+	/* Enable low battery interrupts for 3.3V high and 3.1V low */
+	error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
+				   0xffff,
+				   CPCAP_REG_BPEOL_BIT_BATTDETEN);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static int cpcap_battery_init_iio(struct cpcap_battery_ddata *ddata)
+{
+	const char * const names[CPCAP_BATTERY_IIO_NR] = {
+		"battdetb", "battp", "chg_isense", "batti",
+	};
+	int error, i;
+
+	for (i = 0; i < CPCAP_BATTERY_IIO_NR; i++) {
+		ddata->channels[i] = devm_iio_channel_get(ddata->dev,
+							  names[i]);
+		if (IS_ERR(ddata->channels[i])) {
+			error = PTR_ERR(ddata->channels[i]);
+			goto out_err;
+		}
+
+		if (!ddata->channels[i]->indio_dev) {
+			error = -ENXIO;
+			goto out_err;
+		}
+	}
+
+	return 0;
+
+out_err:
+	dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
+		error);
+
+	return error;
+}
+
+/*
+ * Based on the values from Motorola mapphone Linux kernel. In the
+ * the Motorola mapphone Linux kernel tree the value for pm_cd_factor
+ * is passed to the kernel via device tree. If it turns out to be
+ * something device specific we can consider that too later.
+ *
+ * And looking at the battery full and shutdown values for the stock
+ * kernel on droid 4, full is 4351000 and software initiates shutdown
+ * at 3078000. The device will die around 2743000.
+ */
+static const struct cpcap_battery_config cpcap_battery_default_data = {
+	.ccm = 0x3ff,
+	.cd_factor = 0x3cc,
+	.info.technology = POWER_SUPPLY_TECHNOLOGY_LION,
+	.info.voltage_max_design = 4351000,
+	.info.voltage_min_design = 3100000,
+	.info.charge_full_design = 1740000,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id cpcap_battery_id_table[] = {
+	{
+		.compatible = "motorola,cpcap-battery",
+		.data = &cpcap_battery_default_data,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, cpcap_battery_id_table);
+#endif
+
+static int cpcap_battery_probe(struct platform_device *pdev)
+{
+	struct power_supply_desc *psy_desc;
+	struct cpcap_battery_ddata *ddata;
+	const struct of_device_id *match;
+	struct power_supply_config psy_cfg = {};
+	int error;
+
+	match = of_match_device(of_match_ptr(cpcap_battery_id_table),
+				&pdev->dev);
+	if (!match)
+		return -EINVAL;
+
+	if (!match->data) {
+		dev_err(&pdev->dev, "no configuration data found\n");
+
+		return -ENODEV;
+	}
+
+	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&ddata->irq_list);
+	ddata->dev = &pdev->dev;
+	memcpy(&ddata->config, match->data, sizeof(ddata->config));
+
+	ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
+	if (!ddata->reg)
+		return -ENODEV;
+
+	error = cpcap_get_vendor(ddata->dev, ddata->reg, &ddata->vendor);
+	if (error)
+		return error;
+
+	platform_set_drvdata(pdev, ddata);
+
+	error = regmap_update_bits(ddata->reg, CPCAP_REG_CCM,
+				   0xffff, ddata->config.ccm);
+	if (error)
+		return error;
+
+	error = cpcap_battery_init_interrupts(pdev, ddata);
+	if (error)
+		return error;
+
+	error = cpcap_battery_init_iio(ddata);
+	if (error)
+		return error;
+
+	psy_desc = devm_kzalloc(ddata->dev, sizeof(*psy_desc), GFP_KERNEL);
+	if (!psy_desc)
+		return -ENOMEM;
+
+	psy_desc->name = "battery",
+	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY,
+	psy_desc->properties = cpcap_battery_props,
+	psy_desc->num_properties = ARRAY_SIZE(cpcap_battery_props),
+	psy_desc->get_property = cpcap_battery_get_property,
+
+	psy_cfg.of_node = pdev->dev.of_node;
+	psy_cfg.drv_data = ddata;
+
+	ddata->psy = devm_power_supply_register(ddata->dev, psy_desc,
+						&psy_cfg);
+	error = PTR_ERR_OR_ZERO(ddata->psy);
+	if (error) {
+		dev_err(ddata->dev, "failed to register power supply\n");
+		return error;
+	}
+
+	atomic_set(&ddata->active, 1);
+
+	return 0;
+}
+
+static int cpcap_battery_remove(struct platform_device *pdev)
+{
+	struct cpcap_battery_ddata *ddata = platform_get_drvdata(pdev);
+	int error;
+
+	atomic_set(&ddata->active, 0);
+	error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
+				   0xffff, 0);
+	if (error)
+		dev_err(&pdev->dev, "could not disable: %i\n", error);
+
+	return 0;
+}
+
+static struct platform_driver cpcap_battery_driver = {
+	.driver	= {
+		.name		= "cpcap_battery",
+		.of_match_table = of_match_ptr(cpcap_battery_id_table),
+	},
+	.probe	= cpcap_battery_probe,
+	.remove = cpcap_battery_remove,
+};
+module_platform_driver(cpcap_battery_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("CPCAP PMIC Battery Driver");

drivers/power/supply/cpcap-charger.c

@@ -38,20 +38,27 @@
 #include <linux/iio/consumer.h>
 #include <linux/mfd/motorola-cpcap.h>
 
-/* CPCAP_REG_CRM register bits */
+/*
+ * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
+ * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
+ * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
+ * and values for CPCAP are different, but some of the internal components seem
+ * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
+ * bits that seem to describe the CRM register.
+ */
 #define CPCAP_REG_CRM_UNUSED_641_15	BIT(15)	/* 641 = register number */
 #define CPCAP_REG_CRM_UNUSED_641_14	BIT(14)	/* 641 = register number */
-#define CPCAP_REG_CRM_CHRG_LED_EN	BIT(13)
-#define CPCAP_REG_CRM_RVRSMODE		BIT(12)
-#define CPCAP_REG_CRM_ICHRG_TR1		BIT(11)
+#define CPCAP_REG_CRM_CHRG_LED_EN	BIT(13)	/* Charger LED */
+#define CPCAP_REG_CRM_RVRSMODE		BIT(12)	/* USB VBUS output enable */
+#define CPCAP_REG_CRM_ICHRG_TR1		BIT(11)	/* Trickle charge current */
 #define CPCAP_REG_CRM_ICHRG_TR0		BIT(10)
-#define CPCAP_REG_CRM_FET_OVRD		BIT(9)
-#define CPCAP_REG_CRM_FET_CTRL		BIT(8)
-#define CPCAP_REG_CRM_VCHRG3		BIT(7)
+#define CPCAP_REG_CRM_FET_OVRD		BIT(9)	/* 0 = hardware, 1 = FET_CTRL */
+#define CPCAP_REG_CRM_FET_CTRL		BIT(8)	/* BPFET 1 if FET_OVRD set */
+#define CPCAP_REG_CRM_VCHRG3		BIT(7)	/* Charge voltage bits */
 #define CPCAP_REG_CRM_VCHRG2		BIT(6)
 #define CPCAP_REG_CRM_VCHRG1		BIT(5)
 #define CPCAP_REG_CRM_VCHRG0		BIT(4)
-#define CPCAP_REG_CRM_ICHRG3		BIT(3)
+#define CPCAP_REG_CRM_ICHRG3		BIT(3)	/* Charge current bits */
 #define CPCAP_REG_CRM_ICHRG2		BIT(2)
 #define CPCAP_REG_CRM_ICHRG1		BIT(1)
 #define CPCAP_REG_CRM_ICHRG0		BIT(0)
@@ -63,42 +70,50 @@
 #define CPCAP_REG_CRM_TR_0A48		CPCAP_REG_CRM_TR(0x2)
 #define CPCAP_REG_CRM_TR_0A72		CPCAP_REG_CRM_TR(0x4)
 
-/* CPCAP_REG_CRM charge voltages */
+/*
+ * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
+ * Note that these register bits don't match MC13783UG.pdf VCHRG
+ * register bits.
+ */
 #define CPCAP_REG_CRM_VCHRG(val)	(((val) & 0xf) << 4)
 #define CPCAP_REG_CRM_VCHRG_3V80	CPCAP_REG_CRM_VCHRG(0x0)
 #define CPCAP_REG_CRM_VCHRG_4V10	CPCAP_REG_CRM_VCHRG(0x1)
-#define CPCAP_REG_CRM_VCHRG_4V15	CPCAP_REG_CRM_VCHRG(0x2)
-#define CPCAP_REG_CRM_VCHRG_4V20	CPCAP_REG_CRM_VCHRG(0x3)
-#define CPCAP_REG_CRM_VCHRG_4V22	CPCAP_REG_CRM_VCHRG(0x4)
-#define CPCAP_REG_CRM_VCHRG_4V24	CPCAP_REG_CRM_VCHRG(0x5)
-#define CPCAP_REG_CRM_VCHRG_4V26	CPCAP_REG_CRM_VCHRG(0x6)
-#define CPCAP_REG_CRM_VCHRG_4V28	CPCAP_REG_CRM_VCHRG(0x7)
-#define CPCAP_REG_CRM_VCHRG_4V30	CPCAP_REG_CRM_VCHRG(0x8)
-#define CPCAP_REG_CRM_VCHRG_4V32	CPCAP_REG_CRM_VCHRG(0x9)
-#define CPCAP_REG_CRM_VCHRG_4V34	CPCAP_REG_CRM_VCHRG(0xa)
+#define CPCAP_REG_CRM_VCHRG_4V12	CPCAP_REG_CRM_VCHRG(0x2)
+#define CPCAP_REG_CRM_VCHRG_4V15	CPCAP_REG_CRM_VCHRG(0x3)
+#define CPCAP_REG_CRM_VCHRG_4V17	CPCAP_REG_CRM_VCHRG(0x4)
+#define CPCAP_REG_CRM_VCHRG_4V20	CPCAP_REG_CRM_VCHRG(0x5)
+#define CPCAP_REG_CRM_VCHRG_4V23	CPCAP_REG_CRM_VCHRG(0x6)
+#define CPCAP_REG_CRM_VCHRG_4V25	CPCAP_REG_CRM_VCHRG(0x7)
+#define CPCAP_REG_CRM_VCHRG_4V27	CPCAP_REG_CRM_VCHRG(0x8)
+#define CPCAP_REG_CRM_VCHRG_4V30	CPCAP_REG_CRM_VCHRG(0x9)
+#define CPCAP_REG_CRM_VCHRG_4V33	CPCAP_REG_CRM_VCHRG(0xa)
 #define CPCAP_REG_CRM_VCHRG_4V35	CPCAP_REG_CRM_VCHRG(0xb)
 #define CPCAP_REG_CRM_VCHRG_4V38	CPCAP_REG_CRM_VCHRG(0xc)
 #define CPCAP_REG_CRM_VCHRG_4V40	CPCAP_REG_CRM_VCHRG(0xd)
 #define CPCAP_REG_CRM_VCHRG_4V42	CPCAP_REG_CRM_VCHRG(0xe)
 #define CPCAP_REG_CRM_VCHRG_4V44	CPCAP_REG_CRM_VCHRG(0xf)
 
-/* CPCAP_REG_CRM charge currents */
+/*
+ * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
+ * values in "Table 8-3. Charge Path Regulator Current Limit
+ * Characteristics" for the nominal values.
+ */
 #define CPCAP_REG_CRM_ICHRG(val)	(((val) & 0xf) << 0)
 #define CPCAP_REG_CRM_ICHRG_0A000	CPCAP_REG_CRM_ICHRG(0x0)
 #define CPCAP_REG_CRM_ICHRG_0A070	CPCAP_REG_CRM_ICHRG(0x1)
-#define CPCAP_REG_CRM_ICHRG_0A176	CPCAP_REG_CRM_ICHRG(0x2)
-#define CPCAP_REG_CRM_ICHRG_0A264	CPCAP_REG_CRM_ICHRG(0x3)
-#define CPCAP_REG_CRM_ICHRG_0A352	CPCAP_REG_CRM_ICHRG(0x4)
-#define CPCAP_REG_CRM_ICHRG_0A440	CPCAP_REG_CRM_ICHRG(0x5)
-#define CPCAP_REG_CRM_ICHRG_0A528	CPCAP_REG_CRM_ICHRG(0x6)
-#define CPCAP_REG_CRM_ICHRG_0A616	CPCAP_REG_CRM_ICHRG(0x7)
-#define CPCAP_REG_CRM_ICHRG_0A704	CPCAP_REG_CRM_ICHRG(0x8)
-#define CPCAP_REG_CRM_ICHRG_0A792	CPCAP_REG_CRM_ICHRG(0x9)
-#define CPCAP_REG_CRM_ICHRG_0A880	CPCAP_REG_CRM_ICHRG(0xa)
-#define CPCAP_REG_CRM_ICHRG_0A968	CPCAP_REG_CRM_ICHRG(0xb)
-#define CPCAP_REG_CRM_ICHRG_1A056	CPCAP_REG_CRM_ICHRG(0xc)
-#define CPCAP_REG_CRM_ICHRG_1A144	CPCAP_REG_CRM_ICHRG(0xd)
-#define CPCAP_REG_CRM_ICHRG_1A584	CPCAP_REG_CRM_ICHRG(0xe)
+#define CPCAP_REG_CRM_ICHRG_0A177	CPCAP_REG_CRM_ICHRG(0x2)
+#define CPCAP_REG_CRM_ICHRG_0A266	CPCAP_REG_CRM_ICHRG(0x3)
+#define CPCAP_REG_CRM_ICHRG_0A355	CPCAP_REG_CRM_ICHRG(0x4)
+#define CPCAP_REG_CRM_ICHRG_0A443	CPCAP_REG_CRM_ICHRG(0x5)
+#define CPCAP_REG_CRM_ICHRG_0A532	CPCAP_REG_CRM_ICHRG(0x6)
+#define CPCAP_REG_CRM_ICHRG_0A621	CPCAP_REG_CRM_ICHRG(0x7)
+#define CPCAP_REG_CRM_ICHRG_0A709	CPCAP_REG_CRM_ICHRG(0x8)
+#define CPCAP_REG_CRM_ICHRG_0A798	CPCAP_REG_CRM_ICHRG(0x9)
+#define CPCAP_REG_CRM_ICHRG_0A886	CPCAP_REG_CRM_ICHRG(0xa)
+#define CPCAP_REG_CRM_ICHRG_0A975	CPCAP_REG_CRM_ICHRG(0xb)
+#define CPCAP_REG_CRM_ICHRG_1A064	CPCAP_REG_CRM_ICHRG(0xc)
+#define CPCAP_REG_CRM_ICHRG_1A152	CPCAP_REG_CRM_ICHRG(0xd)
+#define CPCAP_REG_CRM_ICHRG_1A596	CPCAP_REG_CRM_ICHRG(0xe)
 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT	CPCAP_REG_CRM_ICHRG(0xf)
 
 enum {
@@ -428,9 +443,9 @@ static void cpcap_usb_detect(struct work_struct *work)
 		int max_current;
 
 		if (cpcap_charger_battery_found(ddata))
-			max_current = CPCAP_REG_CRM_ICHRG_1A584;
+			max_current = CPCAP_REG_CRM_ICHRG_1A596;
 		else
-			max_current = CPCAP_REG_CRM_ICHRG_0A528;
+			max_current = CPCAP_REG_CRM_ICHRG_0A532;
 
 		error = cpcap_charger_set_state(ddata,
 						CPCAP_REG_CRM_VCHRG_4V35,
@@ -586,6 +601,7 @@ static int cpcap_charger_probe(struct platform_device *pdev)
 {
 	struct cpcap_charger_ddata *ddata;
 	const struct of_device_id *of_id;
+	struct power_supply_config psy_cfg = {};
 	int error;
 
 	of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
@@ -614,9 +630,12 @@ static int cpcap_charger_probe(struct platform_device *pdev)
 
 	atomic_set(&ddata->active, 1);
 
+	psy_cfg.of_node = pdev->dev.of_node;
+	psy_cfg.drv_data = ddata;
+
 	ddata->usb = devm_power_supply_register(ddata->dev,
 						&cpcap_charger_usb_desc,
-						NULL);
+						&psy_cfg);
 	if (IS_ERR(ddata->usb)) {
 		error = PTR_ERR(ddata->usb);
 		dev_err(ddata->dev, "failed to register USB charger: %i\n",

drivers/power/supply/ltc3651-charger.c

@@ -0,0 +1,210 @@
+/*
+ *  Copyright (C) 2017, Topic Embedded Products
+ *  Driver for LTC3651 charger IC.
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+struct ltc3651_charger {
+	struct power_supply *charger;
+	struct power_supply_desc charger_desc;
+	struct gpio_desc *acpr_gpio;
+	struct gpio_desc *fault_gpio;
+	struct gpio_desc *chrg_gpio;
+};
+
+static irqreturn_t ltc3651_charger_irq(int irq, void *devid)
+{
+	struct power_supply *charger = devid;
+
+	power_supply_changed(charger);
+
+	return IRQ_HANDLED;
+}
+
+static inline struct ltc3651_charger *psy_to_ltc3651_charger(
+	struct power_supply *psy)
+{
+	return power_supply_get_drvdata(psy);
+}
+
+static int ltc3651_charger_get_property(struct power_supply *psy,
+		enum power_supply_property psp, union power_supply_propval *val)
+{
+	struct ltc3651_charger *ltc3651_charger = psy_to_ltc3651_charger(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (!ltc3651_charger->chrg_gpio) {
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+			break;
+		}
+		if (gpiod_get_value(ltc3651_charger->chrg_gpio))
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		else
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = gpiod_get_value(ltc3651_charger->acpr_gpio);
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		if (!ltc3651_charger->fault_gpio) {
+			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+			break;
+		}
+		if (!gpiod_get_value(ltc3651_charger->fault_gpio)) {
+			val->intval = POWER_SUPPLY_HEALTH_GOOD;
+			break;
+		}
+		/*
+		 * If the fault pin is active, the chrg pin explains the type
+		 * of failure.
+		 */
+		if (!ltc3651_charger->chrg_gpio) {
+			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+			break;
+		}
+		val->intval = gpiod_get_value(ltc3651_charger->chrg_gpio) ?
+				POWER_SUPPLY_HEALTH_OVERHEAT :
+				POWER_SUPPLY_HEALTH_DEAD;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static enum power_supply_property ltc3651_charger_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_HEALTH,
+};
+
+static int ltc3651_charger_probe(struct platform_device *pdev)
+{
+	struct power_supply_config psy_cfg = {};
+	struct ltc3651_charger *ltc3651_charger;
+	struct power_supply_desc *charger_desc;
+	int ret;
+
+	ltc3651_charger = devm_kzalloc(&pdev->dev, sizeof(*ltc3651_charger),
+					GFP_KERNEL);
+	if (!ltc3651_charger)
+		return -ENOMEM;
+
+	ltc3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
+					"lltc,acpr", GPIOD_IN);
+	if (IS_ERR(ltc3651_charger->acpr_gpio)) {
+		ret = PTR_ERR(ltc3651_charger->acpr_gpio);
+		dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);
+		return ret;
+	}
+	ltc3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,
+					"lltc,fault", GPIOD_IN);
+	if (IS_ERR(ltc3651_charger->fault_gpio)) {
+		ret = PTR_ERR(ltc3651_charger->fault_gpio);
+		dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);
+		return ret;
+	}
+	ltc3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,
+					"lltc,chrg", GPIOD_IN);
+	if (IS_ERR(ltc3651_charger->chrg_gpio)) {
+		ret = PTR_ERR(ltc3651_charger->chrg_gpio);
+		dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);
+		return ret;
+	}
+
+	charger_desc = &ltc3651_charger->charger_desc;
+	charger_desc->name = pdev->dev.of_node->name;
+	charger_desc->type = POWER_SUPPLY_TYPE_MAINS;
+	charger_desc->properties = ltc3651_charger_properties;
+	charger_desc->num_properties = ARRAY_SIZE(ltc3651_charger_properties);
+	charger_desc->get_property = ltc3651_charger_get_property;
+	psy_cfg.of_node = pdev->dev.of_node;
+	psy_cfg.drv_data = ltc3651_charger;
+
+	ltc3651_charger->charger = devm_power_supply_register(&pdev->dev,
+						      charger_desc, &psy_cfg);
+	if (IS_ERR(ltc3651_charger->charger)) {
+		ret = PTR_ERR(ltc3651_charger->charger);
+		dev_err(&pdev->dev, "Failed to register power supply: %d\n",
+			ret);
+		return ret;
+	}
+
+	/*
+	 * Acquire IRQs for the GPIO pins if possible. If the system does not
+	 * support IRQs on these pins, userspace will have to poll the sysfs
+	 * files manually.
+	 */
+	if (ltc3651_charger->acpr_gpio) {
+		ret = gpiod_to_irq(ltc3651_charger->acpr_gpio);
+		if (ret >= 0)
+			ret = devm_request_any_context_irq(&pdev->dev, ret,
+				ltc3651_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(&pdev->dev), ltc3651_charger->charger);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "Failed to request acpr irq\n");
+	}
+	if (ltc3651_charger->fault_gpio) {
+		ret = gpiod_to_irq(ltc3651_charger->fault_gpio);
+		if (ret >= 0)
+			ret = devm_request_any_context_irq(&pdev->dev, ret,
+				ltc3651_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(&pdev->dev), ltc3651_charger->charger);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "Failed to request fault irq\n");
+	}
+	if (ltc3651_charger->chrg_gpio) {
+		ret = gpiod_to_irq(ltc3651_charger->chrg_gpio);
+		if (ret >= 0)
+			ret = devm_request_any_context_irq(&pdev->dev, ret,
+				ltc3651_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(&pdev->dev), ltc3651_charger->charger);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "Failed to request chrg irq\n");
+	}
+
+	platform_set_drvdata(pdev, ltc3651_charger);
+
+	return 0;
+}
+
+static const struct of_device_id ltc3651_charger_match[] = {
+	{ .compatible = "lltc,ltc3651-charger" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ltc3651_charger_match);
+
+static struct platform_driver ltc3651_charger_driver = {
+	.probe = ltc3651_charger_probe,
+	.driver = {
+		.name = "ltc3651-charger",
+		.of_match_table = ltc3651_charger_match,
+	},
+};
+
+module_platform_driver(ltc3651_charger_driver);
+
+MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
+MODULE_DESCRIPTION("Driver for LTC3651 charger");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ltc3651-charger");

drivers/power/supply/power_supply_core.c

@@ -17,6 +17,7 @@
 #include <linux/device.h>
 #include <linux/notifier.h>
 #include <linux/err.h>
+#include <linux/of.h>
 #include <linux/power_supply.h>
 #include <linux/thermal.h>
 #include "power_supply.h"
@@ -274,8 +275,30 @@ static int power_supply_check_supplies(struct power_supply *psy)
 	return power_supply_populate_supplied_from(psy);
 }
 #else
-static inline int power_supply_check_supplies(struct power_supply *psy)
+static int power_supply_check_supplies(struct power_supply *psy)
 {
+	int nval, ret;
+
+	if (!psy->dev.parent)
+		return 0;
+
+	nval = device_property_read_string_array(psy->dev.parent,
+						 "supplied-from", NULL, 0);
+	if (nval <= 0)
+		return 0;
+
+	psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
+						sizeof(char *), GFP_KERNEL);
+	if (!psy->supplied_from)
+		return -ENOMEM;
+
+	ret = device_property_read_string_array(psy->dev.parent,
+		"supplied-from", (const char **)psy->supplied_from, nval);
+	if (ret < 0)
+		return ret;
+
+	psy->num_supplies = nval;
+
 	return 0;
 }
 #endif
@@ -497,6 +520,62 @@ struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 #endif /* CONFIG_OF */
 
+int power_supply_get_battery_info(struct power_supply *psy,
+				  struct power_supply_battery_info *info)
+{
+	struct device_node *battery_np;
+	const char *value;
+	int err;
+
+	info->energy_full_design_uwh         = -EINVAL;
+	info->charge_full_design_uah         = -EINVAL;
+	info->voltage_min_design_uv          = -EINVAL;
+	info->precharge_current_ua           = -EINVAL;
+	info->charge_term_current_ua         = -EINVAL;
+	info->constant_charge_current_max_ua = -EINVAL;
+	info->constant_charge_voltage_max_uv = -EINVAL;
+
+	if (!psy->of_node) {
+		dev_warn(&psy->dev, "%s currently only supports devicetree\n",
+			 __func__);
+		return -ENXIO;
+	}
+
+	battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
+	if (!battery_np)
+		return -ENODEV;
+
+	err = of_property_read_string(battery_np, "compatible", &value);
+	if (err)
+		return err;
+
+	if (strcmp("simple-battery", value))
+		return -ENODEV;
+
+	/* The property and field names below must correspond to elements
+	 * in enum power_supply_property. For reasoning, see
+	 * Documentation/power/power_supply_class.txt.
+	 */
+
+	of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
+			     &info->energy_full_design_uwh);
+	of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
+			     &info->charge_full_design_uah);
+	of_property_read_u32(battery_np, "voltage-min-design-microvolt",
+			     &info->voltage_min_design_uv);
+	of_property_read_u32(battery_np, "precharge-current-microamp",
+			     &info->precharge_current_ua);
+	of_property_read_u32(battery_np, "charge-term-current-microamp",
+			     &info->charge_term_current_ua);
+	of_property_read_u32(battery_np, "constant_charge_current_max_microamp",
+			     &info->constant_charge_current_max_ua);
+	of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt",
+			     &info->constant_charge_voltage_max_uv);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
+
 int power_supply_get_property(struct power_supply *psy,
 			    enum power_supply_property psp,
 			    union power_supply_propval *val)
@@ -669,7 +748,7 @@ static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
 	return ret;
 }
 
-static struct thermal_cooling_device_ops psy_tcd_ops = {
+static const struct thermal_cooling_device_ops psy_tcd_ops = {
 	.get_max_state = ps_get_max_charge_cntl_limit,
 	.get_cur_state = ps_get_cur_chrage_cntl_limit,
 	.set_cur_state = ps_set_cur_charge_cntl_limit,

drivers/power/supply/power_supply_sysfs.c

@@ -40,35 +40,42 @@
 
 static struct device_attribute power_supply_attrs[];
 
+static const char * const power_supply_type_text[] = {
+	"Unknown", "Battery", "UPS", "Mains", "USB",
+	"USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
+	"USB_PD", "USB_PD_DRP", "BrickID"
+};
+
+static const char * const power_supply_status_text[] = {
+	"Unknown", "Charging", "Discharging", "Not charging", "Full"
+};
+
+static const char * const power_supply_charge_type_text[] = {
+	"Unknown", "N/A", "Trickle", "Fast"
+};
+
+static const char * const power_supply_health_text[] = {
+	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
+	"Unspecified failure", "Cold", "Watchdog timer expire",
+	"Safety timer expire"
+};
+
+static const char * const power_supply_technology_text[] = {
+	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
+	"LiMn"
+};
+
+static const char * const power_supply_capacity_level_text[] = {
+	"Unknown", "Critical", "Low", "Normal", "High", "Full"
+};
+
+static const char * const power_supply_scope_text[] = {
+	"Unknown", "System", "Device"
+};
+
 static ssize_t power_supply_show_property(struct device *dev,
 					  struct device_attribute *attr,
 					  char *buf) {
-	static char *type_text[] = {
-		"Unknown", "Battery", "UPS", "Mains", "USB",
-		"USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
-		"USB_PD", "USB_PD_DRP"
-	};
-	static char *status_text[] = {
-		"Unknown", "Charging", "Discharging", "Not charging", "Full"
-	};
-	static char *charge_type[] = {
-		"Unknown", "N/A", "Trickle", "Fast"
-	};
-	static char *health_text[] = {
-		"Unknown", "Good", "Overheat", "Dead", "Over voltage",
-		"Unspecified failure", "Cold", "Watchdog timer expire",
-		"Safety timer expire"
-	};
-	static char *technology_text[] = {
-		"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
-		"LiMn"
-	};
-	static char *capacity_level_text[] = {
-		"Unknown", "Critical", "Low", "Normal", "High", "Full"
-	};
-	static char *scope_text[] = {
-		"Unknown", "System", "Device"
-	};
 	ssize_t ret = 0;
 	struct power_supply *psy = dev_get_drvdata(dev);
 	const ptrdiff_t off = attr - power_supply_attrs;
@@ -91,19 +98,26 @@ static ssize_t power_supply_show_property(struct device *dev,
 	}
 
 	if (off == POWER_SUPPLY_PROP_STATUS)
-		return sprintf(buf, "%s\n", status_text[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_status_text[value.intval]);
 	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
-		return sprintf(buf, "%s\n", charge_type[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_charge_type_text[value.intval]);
 	else if (off == POWER_SUPPLY_PROP_HEALTH)
-		return sprintf(buf, "%s\n", health_text[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_health_text[value.intval]);
 	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
-		return sprintf(buf, "%s\n", technology_text[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_technology_text[value.intval]);
 	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
-		return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_capacity_level_text[value.intval]);
 	else if (off == POWER_SUPPLY_PROP_TYPE)
-		return sprintf(buf, "%s\n", type_text[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_type_text[value.intval]);
 	else if (off == POWER_SUPPLY_PROP_SCOPE)
-		return sprintf(buf, "%s\n", scope_text[value.intval]);
+		return sprintf(buf, "%s\n",
+			       power_supply_scope_text[value.intval]);
 	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
 		return sprintf(buf, "%s\n", value.strval);
 
@@ -117,14 +131,46 @@ static ssize_t power_supply_store_property(struct device *dev,
 	struct power_supply *psy = dev_get_drvdata(dev);
 	const ptrdiff_t off = attr - power_supply_attrs;
 	union power_supply_propval value;
-	long long_val;
 
-	/* TODO: support other types than int */
-	ret = kstrtol(buf, 10, &long_val);
-	if (ret < 0)
-		return ret;
+	/* maybe it is a enum property? */
+	switch (off) {
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = sysfs_match_string(power_supply_status_text, buf);
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		ret = sysfs_match_string(power_supply_charge_type_text, buf);
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		ret = sysfs_match_string(power_supply_health_text, buf);
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		ret = sysfs_match_string(power_supply_technology_text, buf);
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+		ret = sysfs_match_string(power_supply_capacity_level_text, buf);
+		break;
+	case POWER_SUPPLY_PROP_SCOPE:
+		ret = sysfs_match_string(power_supply_scope_text, buf);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	/*
+	 * If no match was found, then check to see if it is an integer.
+	 * Integer values are valid for enums in addition to the text value.
+	 */
+	if (ret < 0) {
+		long long_val;
+
+		ret = kstrtol(buf, 10, &long_val);
+		if (ret < 0)
+			return ret;
+
+		ret = long_val;
+	}
 
-	value.intval = long_val;
+	value.intval = ret;
 
 	ret = power_supply_set_property(psy, off, &value);
 	if (ret < 0)
@@ -196,6 +242,7 @@ static struct device_attribute power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(time_to_full_avg),
 	POWER_SUPPLY_ATTR(type),
 	POWER_SUPPLY_ATTR(scope),
+	POWER_SUPPLY_ATTR(precharge_current),
 	POWER_SUPPLY_ATTR(charge_term_current),
 	POWER_SUPPLY_ATTR(calibrate),
 	/* Properties of type `const char *' */

drivers/power/supply/sbs-battery.c

@@ -171,6 +171,7 @@ struct sbs_info {
 	u32				i2c_retry_count;
 	u32				poll_retry_count;
 	struct delayed_work		work;
+	struct mutex			mode_lock;
 };
 
 static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
@@ -199,7 +200,7 @@ static int sbs_read_word_data(struct i2c_client *client, u8 address)
 		return ret;
 	}
 
-	return le16_to_cpu(ret);
+	return ret;
 }
 
 static int sbs_read_string_data(struct i2c_client *client, u8 address,
@@ -265,7 +266,7 @@ static int sbs_read_string_data(struct i2c_client *client, u8 address,
 	memcpy(values, block_buffer + 1, block_length);
 	values[block_length] = '\0';
 
-	return le16_to_cpu(ret);
+	return ret;
 }
 
 static int sbs_write_word_data(struct i2c_client *client, u8 address,
@@ -278,8 +279,7 @@ static int sbs_write_word_data(struct i2c_client *client, u8 address,
 	retries = chip->i2c_retry_count;
 
 	while (retries > 0) {
-		ret = i2c_smbus_write_word_data(client, address,
-			le16_to_cpu(value));
+		ret = i2c_smbus_write_word_data(client, address, value);
 		if (ret >= 0)
 			break;
 		retries--;
@@ -438,6 +438,11 @@ static int sbs_get_battery_property(struct i2c_client *client,
 	} else {
 		if (psp == POWER_SUPPLY_PROP_STATUS)
 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+		else if (psp == POWER_SUPPLY_PROP_CAPACITY)
+			/* sbs spec says that this can be >100 %
+			 * even if max value is 100 %
+			 */
+			val->intval = min(ret, 100);
 		else
 			val->intval = 0;
 	}
@@ -548,12 +553,7 @@ static int sbs_get_battery_capacity(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	if (psp == POWER_SUPPLY_PROP_CAPACITY) {
-		/* sbs spec says that this can be >100 %
-		* even if max value is 100 % */
-		val->intval = min(ret, 100);
-	} else
-		val->intval = ret;
+	val->intval = ret;
 
 	ret = sbs_set_battery_mode(client, mode);
 	if (ret < 0)
@@ -618,12 +618,17 @@ static int sbs_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_CHARGE_NOW:
 	case POWER_SUPPLY_PROP_CHARGE_FULL:
 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
-	case POWER_SUPPLY_PROP_CAPACITY:
 		ret = sbs_get_property_index(client, psp);
 		if (ret < 0)
 			break;
 
+		/* sbs_get_battery_capacity() will change the battery mode
+		 * temporarily to read the requested attribute. Ensure we stay
+		 * in the desired mode for the duration of the attribute read.
+		 */
+		mutex_lock(&chip->mode_lock);
 		ret = sbs_get_battery_capacity(client, ret, psp, val);
+		mutex_unlock(&chip->mode_lock);
 		break;
 
 	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
@@ -640,6 +645,7 @@ static int sbs_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+	case POWER_SUPPLY_PROP_CAPACITY:
 		ret = sbs_get_property_index(client, psp);
 		if (ret < 0)
 			break;
@@ -808,6 +814,7 @@ static int sbs_probe(struct i2c_client *client,
 	psy_cfg.of_node = client->dev.of_node;
 	psy_cfg.drv_data = chip;
 	chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
+	mutex_init(&chip->mode_lock);
 
 	/* use pdata if available, fall back to DT properties,
 	 * or hardcoded defaults if not

drivers/power/supply/twl4030_charger.c

@@ -153,7 +153,7 @@ struct twl4030_bci {
 };
 
 /* strings for 'usb_mode' values */
-static char *modes[] = { "off", "auto", "continuous" };
+static const char *modes[] = { "off", "auto", "continuous" };
 
 /*
  * clear and set bits on an given register on a given module
@@ -624,63 +624,6 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 	return IRQ_HANDLED;
 }
 
-/*
- * Provide "max_current" attribute in sysfs.
- */
-static ssize_t
-twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
-	const char *buf, size_t n)
-{
-	struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
-	int cur = 0;
-	int status = 0;
-	status = kstrtoint(buf, 10, &cur);
-	if (status)
-		return status;
-	if (cur < 0)
-		return -EINVAL;
-	if (dev == &bci->ac->dev)
-		bci->ac_cur = cur;
-	else
-		bci->usb_cur_target = cur;
-
-	twl4030_charger_update_current(bci);
-	return n;
-}
-
-/*
- * sysfs max_current show
- */
-static ssize_t twl4030_bci_max_current_show(struct device *dev,
-	struct device_attribute *attr, char *buf)
-{
-	int status = 0;
-	int cur = -1;
-	u8 bcictl1;
-	struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
-
-	if (dev == &bci->ac->dev) {
-		if (!bci->ac_is_active)
-			cur = bci->ac_cur;
-	} else {
-		if (bci->ac_is_active)
-			cur = bci->usb_cur_target;
-	}
-	if (cur < 0) {
-		cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
-		if (cur < 0)
-			return cur;
-		status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
-		if (status < 0)
-			return status;
-		cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
-	}
-	return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
-}
-
-static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
-			twl4030_bci_max_current_store);
-
 static void twl4030_bci_usb_work(struct work_struct *data)
 {
 	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
@@ -726,14 +669,10 @@ twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 	int mode;
 	int status;
 
-	if (sysfs_streq(buf, modes[0]))
-		mode = 0;
-	else if (sysfs_streq(buf, modes[1]))
-		mode = 1;
-	else if (sysfs_streq(buf, modes[2]))
-		mode = 2;
-	else
-		return -EINVAL;
+	mode = sysfs_match_string(modes, buf);
+	if (mode < 0)
+		return mode;
+
 	if (dev == &bci->ac->dev) {
 		if (mode == 2)
 			return -EINVAL;
@@ -1041,6 +980,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, bci);
 
+	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
+	if (IS_ERR(bci->channel_vac)) {
+		bci->channel_vac = NULL;
+		dev_warn(&pdev->dev, "could not request vac iio channel");
+	}
+
 	bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
 					     NULL);
 	if (IS_ERR(bci->ac)) {
@@ -1074,12 +1019,6 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
-	if (IS_ERR(bci->channel_vac)) {
-		bci->channel_vac = NULL;
-		dev_warn(&pdev->dev, "could not request vac iio channel");
-	}
-
 	INIT_WORK(&bci->work, twl4030_bci_usb_work);
 	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
 
@@ -1101,7 +1040,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 			       TWL4030_INTERRUPTS_BCIIMR1A);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
-		goto fail;
+		return ret;
 	}
 
 	reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
@@ -1111,14 +1050,10 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 
 	twl4030_charger_update_current(bci);
-	if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
-		dev_warn(&pdev->dev, "could not create sysfs file\n");
 	if (device_create_file(&bci->usb->dev, &dev_attr_mode))
 		dev_warn(&pdev->dev, "could not create sysfs file\n");
 	if (device_create_file(&bci->ac->dev, &dev_attr_mode))
 		dev_warn(&pdev->dev, "could not create sysfs file\n");
-	if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
-		dev_warn(&pdev->dev, "could not create sysfs file\n");
 
 	twl4030_charger_enable_ac(bci, true);
 	if (!IS_ERR_OR_NULL(bci->transceiver))
@@ -1134,10 +1069,6 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 		twl4030_charger_enable_backup(0, 0);
 
 	return 0;
-fail:
-	iio_channel_release(bci->channel_vac);
-
-	return ret;
 }
 
 static int twl4030_bci_remove(struct platform_device *pdev)
@@ -1148,11 +1079,7 @@ static int twl4030_bci_remove(struct platform_device *pdev)
 	twl4030_charger_enable_usb(bci, false);
 	twl4030_charger_enable_backup(0, 0);
 
-	iio_channel_release(bci->channel_vac);
-
-	device_remove_file(&bci->usb->dev, &dev_attr_max_current);
 	device_remove_file(&bci->usb->dev, &dev_attr_mode);
-	device_remove_file(&bci->ac->dev, &dev_attr_max_current);
 	device_remove_file(&bci->ac->dev, &dev_attr_mode);
 	/* mask interrupts */
 	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,

include/linux/power/bq27xxx_battery.h

@@ -40,6 +40,9 @@ struct bq27xxx_platform_data {
 struct bq27xxx_device_info;
 struct bq27xxx_access_methods {
 	int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
+	int (*write)(struct bq27xxx_device_info *di, u8 reg, int value, bool single);
+	int (*read_bulk)(struct bq27xxx_device_info *di, u8 reg, u8 *data, int len);
+	int (*write_bulk)(struct bq27xxx_device_info *di, u8 reg, u8 *data, int len);
 };
 
 struct bq27xxx_reg_cache {
@@ -60,7 +63,10 @@ struct bq27xxx_device_info {
 	struct device *dev;
 	int id;
 	enum bq27xxx_chip chip;
+	bool ram_chip;
 	const char *name;
+	struct bq27xxx_dm_reg *dm_regs;
+	u32 unseal_key;
 	struct bq27xxx_access_methods bus;
 	struct bq27xxx_reg_cache cache;
 	int charge_design_full;

include/linux/power_supply.h

@@ -146,6 +146,7 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
 	POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */
 	POWER_SUPPLY_PROP_SCOPE,
+	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 	POWER_SUPPLY_PROP_CALIBRATE,
 	/* Properties of type `const char *' */
@@ -159,13 +160,14 @@ enum power_supply_type {
 	POWER_SUPPLY_TYPE_BATTERY,
 	POWER_SUPPLY_TYPE_UPS,
 	POWER_SUPPLY_TYPE_MAINS,
-	POWER_SUPPLY_TYPE_USB,		/* Standard Downstream Port */
-	POWER_SUPPLY_TYPE_USB_DCP,	/* Dedicated Charging Port */
-	POWER_SUPPLY_TYPE_USB_CDP,	/* Charging Downstream Port */
-	POWER_SUPPLY_TYPE_USB_ACA,	/* Accessory Charger Adapters */
-	POWER_SUPPLY_TYPE_USB_TYPE_C,	/* Type C Port */
-	POWER_SUPPLY_TYPE_USB_PD,	/* Power Delivery Port */
-	POWER_SUPPLY_TYPE_USB_PD_DRP,	/* PD Dual Role Port */
+	POWER_SUPPLY_TYPE_USB,			/* Standard Downstream Port */
+	POWER_SUPPLY_TYPE_USB_DCP,		/* Dedicated Charging Port */
+	POWER_SUPPLY_TYPE_USB_CDP,		/* Charging Downstream Port */
+	POWER_SUPPLY_TYPE_USB_ACA,		/* Accessory Charger Adapters */
+	POWER_SUPPLY_TYPE_USB_TYPE_C,		/* Type C Port */
+	POWER_SUPPLY_TYPE_USB_PD,		/* Power Delivery Port */
+	POWER_SUPPLY_TYPE_USB_PD_DRP,		/* PD Dual Role Port */
+	POWER_SUPPLY_TYPE_APPLE_BRICK_ID,	/* Apple Charging Method */
 };
 
 enum power_supply_notifier_events {
@@ -288,6 +290,25 @@ struct power_supply_info {
 	int use_for_apm;
 };
 
+/*
+ * This is the recommended struct to manage static battery parameters,
+ * populated by power_supply_get_battery_info(). Most platform drivers should
+ * use these for consistency.
+ * Its field names must correspond to elements in enum power_supply_property.
+ * The default field value is -EINVAL.
+ * Power supply class itself doesn't use this.
+ */
+
+struct power_supply_battery_info {
+	int energy_full_design_uwh;	    /* microWatt-hours */
+	int charge_full_design_uah;	    /* microAmp-hours */
+	int voltage_min_design_uv;	    /* microVolts */
+	int precharge_current_ua;	    /* microAmps */
+	int charge_term_current_ua;	    /* microAmps */
+	int constant_charge_current_max_ua; /* microAmps */
+	int constant_charge_voltage_max_uv; /* microVolts */
+};
+
 extern struct atomic_notifier_head power_supply_notifier;
 extern int power_supply_reg_notifier(struct notifier_block *nb);
 extern void power_supply_unreg_notifier(struct notifier_block *nb);
@@ -306,6 +327,9 @@ static inline struct power_supply *
 devm_power_supply_get_by_phandle(struct device *dev, const char *property)
 { return NULL; }
 #endif /* CONFIG_OF */
+
+extern int power_supply_get_battery_info(struct power_supply *psy,
+					 struct power_supply_battery_info *info);
 extern void power_supply_changed(struct power_supply *psy);
 extern int power_supply_am_i_supplied(struct power_supply *psy);
 extern int power_supply_set_battery_charged(struct power_supply *psy);
@@ -359,6 +383,8 @@ static inline bool power_supply_is_amp_property(enum power_supply_property psp)
 	case POWER_SUPPLY_PROP_CHARGE_NOW:
 	case POWER_SUPPLY_PROP_CHARGE_AVG:
 	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 	case POWER_SUPPLY_PROP_CURRENT_MAX: