[PATCH 1/6] Input: edt-ft5x06

* [PATCH 1/6] Input: edt-ft5x06 - switch to newer gpio framework
@ 2015-09-12 17:45 Dmitry Torokhov
  2015-09-12 17:45 ` [PATCH 2/6] Input: edt-ft5x06 - drop parsing of irq gpio Dmitry Torokhov
                   ` (5 more replies)
  0 siblings, 6 replies; 11+ messages in thread
From: Dmitry Torokhov @ 2015-09-12 17:45 UTC (permalink / raw)
  To: linux-input
  Cc: linux-kernel, Franklin S Cooper Jr, Maxime Ripard, Lothar Waßmann

From: Franklin S Cooper Jr <fcooper@ti.com>

The current/old gpio framework used doesn't properly listen to
ACTIVE_LOW and ACTIVE_HIGH flags. The newer gpio framework takes into
account these flags when setting gpio values.

Since the values being output were based on voltage and not logic they
change to reflect this difference. Also use gpiod_set_value_cansleep since
wake and reset pins can be provided by bus based io expanders.

Switch from msleep(5) to udelay_range(5000,6000) to avoid check patch
warning.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 .../bindings/input/touchscreen/edt-ft5x06.txt      |   4 +-
 drivers/input/touchscreen/edt-ft5x06.c             | 129 ++++++---------------
 include/linux/input/edt-ft5x06.h                   |   3 -
 3 files changed, 40 insertions(+), 96 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
index 76db967..9330d4d 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
@@ -50,6 +50,6 @@ Example:
 		pinctrl-0 = <&edt_ft5x06_pins>;
 		interrupt-parent = <&gpio2>;
 		interrupts = <5 0>;
-		reset-gpios = <&gpio2 6 1>;
-		wake-gpios = <&gpio4 9 0>;
+		reset-gpios = <&gpio2 6 GPIO_ACTIVE_LOW>;
+		wake-gpios = <&gpio4 9 GPIO_ACTIVE_HIGH>;
 	};
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 48de1e8..5738722 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -34,8 +34,7 @@
 #include <linux/delay.h>
 #include <linux/debugfs.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/input/mt.h>
 #include <linux/input/touchscreen.h>
 #include <linux/input/edt-ft5x06.h>
@@ -91,9 +90,9 @@ struct edt_ft5x06_ts_data {
 	u16 num_x;
 	u16 num_y;
 
-	int reset_pin;
-	int irq_pin;
-	int wake_pin;
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *wake_gpio;
+	struct gpio_desc *irq_gpio;
 
 #if defined(CONFIG_DEBUG_FS)
 	struct dentry *debug_dir;
@@ -752,45 +751,6 @@ edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
 
 #endif /* CONFIG_DEBUGFS */
 
-static int edt_ft5x06_ts_reset(struct i2c_client *client,
-			struct edt_ft5x06_ts_data *tsdata)
-{
-	int error;
-
-	if (gpio_is_valid(tsdata->wake_pin)) {
-		error = devm_gpio_request_one(&client->dev,
-					tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
-					"edt-ft5x06 wake");
-		if (error) {
-			dev_err(&client->dev,
-				"Failed to request GPIO %d as wake pin, error %d\n",
-				tsdata->wake_pin, error);
-			return error;
-		}
-
-		msleep(5);
-		gpio_set_value(tsdata->wake_pin, 1);
-	}
-	if (gpio_is_valid(tsdata->reset_pin)) {
-		/* this pulls reset down, enabling the low active reset */
-		error = devm_gpio_request_one(&client->dev,
-					tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
-					"edt-ft5x06 reset");
-		if (error) {
-			dev_err(&client->dev,
-				"Failed to request GPIO %d as reset pin, error %d\n",
-				tsdata->reset_pin, error);
-			return error;
-		}
-
-		msleep(5);
-		gpio_set_value(tsdata->reset_pin, 1);
-		msleep(300);
-	}
-
-	return 0;
-}
-
 static int edt_ft5x06_ts_identify(struct i2c_client *client,
 					struct edt_ft5x06_ts_data *tsdata,
 					char *fw_version)
@@ -931,30 +891,6 @@ edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
 	}
 }
 
-#ifdef CONFIG_OF
-static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
-				struct edt_ft5x06_ts_data *tsdata)
-{
-	struct device_node *np = dev->of_node;
-
-	/*
-	 * irq_pin is not needed for DT setup.
-	 * irq is associated via 'interrupts' property in DT
-	 */
-	tsdata->irq_pin = -EINVAL;
-	tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
-	tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
-
-	return 0;
-}
-#else
-static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
-					struct edt_ft5x06_ts_data *tsdata)
-{
-	return -ENODEV;
-}
-#endif
-
 static int edt_ft5x06_ts_probe(struct i2c_client *client,
 					 const struct i2c_device_id *id)
 {
@@ -973,32 +909,42 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
 		return -ENOMEM;
 	}
 
-	if (!pdata) {
-		error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
-		if (error) {
-			dev_err(&client->dev,
-				"DT probe failed and no platform data present\n");
-			return error;
-		}
-	} else {
-		tsdata->reset_pin = pdata->reset_pin;
-		tsdata->irq_pin = pdata->irq_pin;
-		tsdata->wake_pin = -EINVAL;
+	tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
+						     "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(tsdata->reset_gpio)) {
+		error = PTR_ERR(tsdata->reset_gpio);
+		dev_err(&client->dev,
+			"Failed to request GPIO reset pin, error %d\n", error);
+		return error;
 	}
 
-	error = edt_ft5x06_ts_reset(client, tsdata);
-	if (error)
+	tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
+						    "wake", GPIOD_OUT_LOW);
+	if (IS_ERR(tsdata->wake_gpio)) {
+		error = PTR_ERR(tsdata->wake_gpio);
+		dev_err(&client->dev,
+			"Failed to request GPIO wake pin, error %d\n", error);
 		return error;
+	}
 
-	if (gpio_is_valid(tsdata->irq_pin)) {
-		error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
-					GPIOF_IN, "edt-ft5x06 irq");
-		if (error) {
-			dev_err(&client->dev,
-				"Failed to request GPIO %d, error %d\n",
-				tsdata->irq_pin, error);
-			return error;
-		}
+	tsdata->irq_gpio = devm_gpiod_get_optional(&client->dev,
+						   "irq", GPIOD_IN);
+	if (IS_ERR(tsdata->irq_gpio)) {
+		error = PTR_ERR(tsdata->irq_gpio);
+		dev_err(&client->dev,
+			"Failed to request GPIO irq pin, error %d\n", error);
+		return error;
+	}
+
+	if (tsdata->wake_gpio) {
+		usleep_range(5000, 6000);
+		gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
+	}
+
+	if (tsdata->reset_gpio) {
+		usleep_range(5000, 6000);
+		gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
+		msleep(300);
 	}
 
 	input = devm_input_allocate_device(&client->dev);
@@ -1074,7 +1020,8 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
 
 	dev_dbg(&client->dev,
 		"EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
-		client->irq, tsdata->wake_pin, tsdata->reset_pin);
+		client->irq, desc_to_gpio(tsdata->wake_gpio),
+		desc_to_gpio(tsdata->reset_gpio));
 
 	return 0;
 
diff --git a/include/linux/input/edt-ft5x06.h b/include/linux/input/edt-ft5x06.h
index 8a1e0d1..5ca5b4c 100644
--- a/include/linux/input/edt-ft5x06.h
+++ b/include/linux/input/edt-ft5x06.h
@@ -10,9 +10,6 @@
  */
 
 struct edt_ft5x06_platform_data {
-	int irq_pin;
-	int reset_pin;
-
 	/* startup defaults for operational parameters */
 	bool use_parameters;
 	u8 gain;
-- 
2.6.0.rc0.131.gf624c3d


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