Input: zforce_ts - convert to use the gpiod interface

Use the new GPIO descriptor interface to handle the zForce GPIOs.
This simplifies the code and allows transparently handle GPIO polarity, as
specified in device tree data.

Also switch to using gpio_{set|get}_value_cansleep() since none of the
callers is in atomic context and cansleep variant allows more GPIO
controllers to be used with the touchscreen.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/zforce_ts.c

@@ -24,14 +24,13 @@
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
 #include <linux/input/mt.h>
 #include <linux/platform_data/zforce_ts.h>
 #include <linux/regulator/consumer.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 
 #define WAIT_TIMEOUT		msecs_to_jiffies(1000)
 
@@ -120,6 +119,9 @@ struct zforce_ts {
 
 	struct regulator	*reg_vdd;
 
+	struct gpio_desc	*gpio_int;
+	struct gpio_desc	*gpio_rst;
+
 	bool			suspending;
 	bool			suspended;
 	bool			boot_complete;
@@ -161,6 +163,16 @@ static int zforce_command(struct zforce_ts *ts, u8 cmd)
 	return 0;
 }
 
+static void zforce_reset_assert(struct zforce_ts *ts)
+{
+	gpiod_set_value_cansleep(ts->gpio_rst, 1);
+}
+
+static void zforce_reset_deassert(struct zforce_ts *ts)
+{
+	gpiod_set_value_cansleep(ts->gpio_rst, 0);
+}
+
 static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len)
 {
 	struct i2c_client *client = ts->client;
@@ -479,7 +491,6 @@ static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
 {
 	struct zforce_ts *ts = dev_id;
 	struct i2c_client *client = ts->client;
-	const struct zforce_ts_platdata *pdata = ts->pdata;
 	int ret;
 	u8 payload_buffer[FRAME_MAXSIZE];
 	u8 *payload;
@@ -499,7 +510,7 @@ static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
 	if (!ts->suspending && device_may_wakeup(&client->dev))
 		pm_stay_awake(&client->dev);
 
-	while (!gpio_get_value(pdata->gpio_int)) {
+	while (!gpiod_get_value_cansleep(ts->gpio_int)) {
 		ret = zforce_read_packet(ts, payload_buffer);
 		if (ret < 0) {
 			dev_err(&client->dev,
@@ -690,7 +701,7 @@ static void zforce_reset(void *data)
 {
 	struct zforce_ts *ts = data;
 
-	gpio_set_value(ts->pdata->gpio_rst, 0);
+	zforce_reset_assert(ts);
 
 	udelay(10);
 
@@ -712,18 +723,6 @@ static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
 		return ERR_PTR(-ENOMEM);
 	}
 
-	pdata->gpio_int = of_get_gpio(np, 0);
-	if (!gpio_is_valid(pdata->gpio_int)) {
-		dev_err(dev, "failed to get interrupt gpio\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	pdata->gpio_rst = of_get_gpio(np, 1);
-	if (!gpio_is_valid(pdata->gpio_rst)) {
-		dev_err(dev, "failed to get reset gpio\n");
-		return ERR_PTR(-EINVAL);
-	}
-
 	if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
 		dev_err(dev, "failed to get x-size property\n");
 		return ERR_PTR(-EINVAL);
@@ -755,19 +754,22 @@ static int zforce_probe(struct i2c_client *client,
 	if (!ts)
 		return -ENOMEM;
 
-	ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN,
-				    "zforce_ts_int");
-	if (ret) {
-		dev_err(&client->dev, "request of gpio %d failed, %d\n",
-			pdata->gpio_int, ret);
+	/* INT GPIO */
+	ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, GPIOD_IN);
+	if (IS_ERR(ts->gpio_int)) {
+		ret = PTR_ERR(ts->gpio_int);
+		dev_err(&client->dev,
+			"failed to request interrupt GPIO: %d\n", ret);
 		return ret;
 	}
 
-	ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
-				    GPIOF_OUT_INIT_LOW, "zforce_ts_rst");
-	if (ret) {
-		dev_err(&client->dev, "request of gpio %d failed, %d\n",
-			pdata->gpio_rst, ret);
+	/* RST GPIO */
+	ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1,
+					    GPIOD_OUT_HIGH);
+	if (IS_ERR(ts->gpio_rst)) {
+		ret = PTR_ERR(ts->gpio_rst);
+		dev_err(&client->dev,
+			"failed to request reset GPIO: %d\n", ret);
 		return ret;
 	}
 
@@ -863,7 +865,7 @@ static int zforce_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, ts);
 
 	/* let the controller boot */
-	gpio_set_value(pdata->gpio_rst, 1);
+	zforce_reset_deassert(ts);
 
 	ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
 	if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)

include/linux/platform_data/zforce_ts.h

@@ -16,9 +16,6 @@
 #define _LINUX_INPUT_ZFORCE_TS_H
 
 struct zforce_ts_platdata {
-	int gpio_int;
-	int gpio_rst;
-
 	unsigned int x_max;
 	unsigned int y_max;
 };