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@@ -1,5 +1,5 @@
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/*
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- * LEDs driver for Freescale MC13783/MC13892
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+ * LEDs driver for Freescale MC13783/MC13892/MC34708
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*
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* Copyright (C) 2010 Philippe Rétornaz
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*
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@@ -17,57 +17,56 @@
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#include <linux/module.h>
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#include <linux/kernel.h>
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-#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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+#include <linux/of.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/mc13xxx.h>
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-#define MC13XXX_REG_LED_CONTROL(x) (51 + (x))
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-
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struct mc13xxx_led_devtype {
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int led_min;
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int led_max;
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int num_regs;
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+ u32 ledctrl_base;
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};
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struct mc13xxx_led {
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struct led_classdev cdev;
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struct work_struct work;
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- struct mc13xxx *master;
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enum led_brightness new_brightness;
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int id;
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+ struct mc13xxx_leds *leds;
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};
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struct mc13xxx_leds {
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+ struct mc13xxx *master;
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struct mc13xxx_led_devtype *devtype;
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int num_leds;
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- struct mc13xxx_led led[0];
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+ struct mc13xxx_led *led;
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};
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+static unsigned int mc13xxx_max_brightness(int id)
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+{
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+ if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
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+ return 0x0f;
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+ else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
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+ return 0x1f;
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+
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+ return 0x3f;
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+}
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+
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static void mc13xxx_led_work(struct work_struct *work)
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{
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struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
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- int reg, mask, value, bank, off, shift;
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+ struct mc13xxx_leds *leds = led->leds;
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+ unsigned int reg, bank, off, shift;
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switch (led->id) {
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case MC13783_LED_MD:
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- reg = MC13XXX_REG_LED_CONTROL(2);
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- shift = 9;
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- mask = 0x0f;
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- value = led->new_brightness >> 4;
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- break;
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case MC13783_LED_AD:
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- reg = MC13XXX_REG_LED_CONTROL(2);
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- shift = 13;
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- mask = 0x0f;
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- value = led->new_brightness >> 4;
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- break;
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case MC13783_LED_KP:
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- reg = MC13XXX_REG_LED_CONTROL(2);
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- shift = 17;
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- mask = 0x0f;
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- value = led->new_brightness >> 4;
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+ reg = 2;
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+ shift = 9 + (led->id - MC13783_LED_MD) * 4;
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break;
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case MC13783_LED_R1:
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case MC13783_LED_G1:
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@@ -80,44 +79,35 @@ static void mc13xxx_led_work(struct work_struct *work)
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case MC13783_LED_B3:
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off = led->id - MC13783_LED_R1;
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bank = off / 3;
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- reg = MC13XXX_REG_LED_CONTROL(3) + bank;
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+ reg = 3 + bank;
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shift = (off - bank * 3) * 5 + 6;
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- value = led->new_brightness >> 3;
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- mask = 0x1f;
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break;
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case MC13892_LED_MD:
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- reg = MC13XXX_REG_LED_CONTROL(0);
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- shift = 3;
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- mask = 0x3f;
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- value = led->new_brightness >> 2;
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- break;
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case MC13892_LED_AD:
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- reg = MC13XXX_REG_LED_CONTROL(0);
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- shift = 15;
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- mask = 0x3f;
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- value = led->new_brightness >> 2;
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- break;
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case MC13892_LED_KP:
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- reg = MC13XXX_REG_LED_CONTROL(1);
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- shift = 3;
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- mask = 0x3f;
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- value = led->new_brightness >> 2;
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+ reg = (led->id - MC13892_LED_MD) / 2;
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+ shift = 3 + (led->id - MC13892_LED_MD) * 12;
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break;
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case MC13892_LED_R:
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case MC13892_LED_G:
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case MC13892_LED_B:
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off = led->id - MC13892_LED_R;
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bank = off / 2;
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- reg = MC13XXX_REG_LED_CONTROL(2) + bank;
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+ reg = 2 + bank;
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shift = (off - bank * 2) * 12 + 3;
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- value = led->new_brightness >> 2;
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- mask = 0x3f;
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+ break;
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+ case MC34708_LED_R:
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+ case MC34708_LED_G:
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+ reg = 0;
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+ shift = 3 + (led->id - MC34708_LED_R) * 12;
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break;
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default:
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BUG();
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}
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- mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
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+ mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
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+ mc13xxx_max_brightness(led->id) << shift,
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+ led->new_brightness << shift);
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}
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static void mc13xxx_led_set(struct led_classdev *led_cdev,
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@@ -130,47 +120,121 @@ static void mc13xxx_led_set(struct led_classdev *led_cdev,
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schedule_work(&led->work);
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}
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-static int __init mc13xxx_led_probe(struct platform_device *pdev)
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+#ifdef CONFIG_OF
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+static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
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+ struct platform_device *pdev)
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{
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- struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
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- struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
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- struct mc13xxx_led_devtype *devtype =
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- (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
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- struct mc13xxx_leds *leds;
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- int i, id, num_leds, ret = -ENODATA;
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- u32 reg, init_led = 0;
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+ struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
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+ struct mc13xxx_leds_platform_data *pdata;
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+ struct device_node *parent, *child;
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+ struct device *dev = &pdev->dev;
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+ int i = 0, ret = -ENODATA;
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+
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+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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+ if (!pdata)
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+ return ERR_PTR(-ENOMEM);
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+
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+ of_node_get(dev->parent->of_node);
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+
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+ parent = of_find_node_by_name(dev->parent->of_node, "leds");
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+ if (!parent)
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+ goto out_node_put;
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- if (!pdata) {
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- dev_err(&pdev->dev, "Missing platform data\n");
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- return -ENODEV;
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+ ret = of_property_read_u32_array(parent, "led-control",
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+ pdata->led_control,
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+ leds->devtype->num_regs);
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+ if (ret)
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+ goto out_node_put;
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+
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+ pdata->num_leds = of_get_child_count(parent);
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+
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+ pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
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+ GFP_KERNEL);
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+ if (!pdata->led) {
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+ ret = -ENOMEM;
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+ goto out_node_put;
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}
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- num_leds = pdata->num_leds;
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+ for_each_child_of_node(parent, child) {
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+ const char *str;
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+ u32 tmp;
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- if ((num_leds < 1) ||
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- (num_leds > (devtype->led_max - devtype->led_min + 1))) {
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- dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
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- return -EINVAL;
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+ if (of_property_read_u32(child, "reg", &tmp))
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+ continue;
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+ pdata->led[i].id = leds->devtype->led_min + tmp;
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+
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+ if (!of_property_read_string(child, "label", &str))
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+ pdata->led[i].name = str;
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+ if (!of_property_read_string(child, "linux,default-trigger",
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+ &str))
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+ pdata->led[i].default_trigger = str;
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+
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+ i++;
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}
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- leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
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- sizeof(struct mc13xxx_leds), GFP_KERNEL);
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+ pdata->num_leds = i;
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+ ret = i > 0 ? 0 : -ENODATA;
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+
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+out_node_put:
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+ of_node_put(parent);
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+
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+ return ret ? ERR_PTR(ret) : pdata;
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+}
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+#else
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+static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
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+ struct platform_device *pdev)
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+{
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+ return ERR_PTR(-ENOSYS);
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+}
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+#endif
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+
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+static int __init mc13xxx_led_probe(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
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+ struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
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+ struct mc13xxx_led_devtype *devtype =
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+ (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
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+ struct mc13xxx_leds *leds;
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+ int i, id, ret = -ENODATA;
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+ u32 init_led = 0;
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+
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+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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leds->devtype = devtype;
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- leds->num_leds = num_leds;
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+ leds->master = mcdev;
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platform_set_drvdata(pdev, leds);
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+ if (dev->parent->of_node) {
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+ pdata = mc13xxx_led_probe_dt(pdev);
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+ if (IS_ERR(pdata))
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+ return PTR_ERR(pdata);
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+ } else if (!pdata)
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+ return -ENODATA;
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+
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+ leds->num_leds = pdata->num_leds;
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+
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+ if ((leds->num_leds < 1) ||
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+ (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
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+ dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
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+ return -EINVAL;
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+ }
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+
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+ leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
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+ GFP_KERNEL);
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+ if (!leds->led)
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+ return -ENOMEM;
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+
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for (i = 0; i < devtype->num_regs; i++) {
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- reg = pdata->led_control[i];
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- WARN_ON(reg >= (1 << 24));
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- ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
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+ ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
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+ pdata->led_control[i]);
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if (ret)
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return ret;
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}
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- for (i = 0; i < num_leds; i++) {
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+ for (i = 0; i < leds->num_leds; i++) {
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const char *name, *trig;
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ret = -EINVAL;
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@@ -180,30 +244,29 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev)
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trig = pdata->led[i].default_trigger;
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if ((id > devtype->led_max) || (id < devtype->led_min)) {
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- dev_err(&pdev->dev, "Invalid ID %i\n", id);
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+ dev_err(dev, "Invalid ID %i\n", id);
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break;
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}
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if (init_led & (1 << id)) {
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- dev_warn(&pdev->dev,
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- "LED %i already initialized\n", id);
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+ dev_warn(dev, "LED %i already initialized\n", id);
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break;
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}
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init_led |= 1 << id;
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leds->led[i].id = id;
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- leds->led[i].master = mcdev;
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+ leds->led[i].leds = leds;
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leds->led[i].cdev.name = name;
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leds->led[i].cdev.default_trigger = trig;
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+ leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
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leds->led[i].cdev.brightness_set = mc13xxx_led_set;
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- leds->led[i].cdev.brightness = LED_OFF;
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+ leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
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INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
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- ret = led_classdev_register(pdev->dev.parent,
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- &leds->led[i].cdev);
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+ ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
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if (ret) {
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- dev_err(&pdev->dev, "Failed to register LED %i\n", id);
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+ dev_err(dev, "Failed to register LED %i\n", id);
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break;
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}
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}
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@@ -219,7 +282,6 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev)
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static int mc13xxx_led_remove(struct platform_device *pdev)
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{
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- struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
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struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
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int i;
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@@ -228,9 +290,6 @@ static int mc13xxx_led_remove(struct platform_device *pdev)
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cancel_work_sync(&leds->led[i].work);
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}
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- for (i = 0; i < leds->devtype->num_regs; i++)
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- mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
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-
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return 0;
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}
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@@ -238,17 +297,27 @@ static const struct mc13xxx_led_devtype mc13783_led_devtype = {
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.led_min = MC13783_LED_MD,
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.led_max = MC13783_LED_B3,
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.num_regs = 6,
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+ .ledctrl_base = 51,
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};
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static const struct mc13xxx_led_devtype mc13892_led_devtype = {
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.led_min = MC13892_LED_MD,
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.led_max = MC13892_LED_B,
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.num_regs = 4,
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+ .ledctrl_base = 51,
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+};
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+
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+static const struct mc13xxx_led_devtype mc34708_led_devtype = {
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+ .led_min = MC34708_LED_R,
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+ .led_max = MC34708_LED_G,
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+ .num_regs = 1,
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+ .ledctrl_base = 54,
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};
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static const struct platform_device_id mc13xxx_led_id_table[] = {
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{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
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{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
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+ { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
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Linus Torvalds