Date:	Thu, 13 Aug 2015 12:12:06 -0700
From:	Andrew Duggan <aduggan@...aptics.com>
To:	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Andrew Duggan <aduggan@...aptics.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Christopher Heiny <cheiny@...aptics.com>,
	Vincent Huang <vincent.huang@...synaptics.com>,
	Stephen Chandler Paul <cpaul@...hat.com>
Subject: [PATCH] Input: synaptics-rmi4: Use generic interrupt handling

Currently the RMI4 driver expects the device to have a GPIO and manages
the that GPIO internally. However, this duplicates functionality which
could be handled by more generic interrupt handling code. Also, some
RMI devices will not have a GPIO or it won't be accessible to the rmi4
driver. This patch removes the GPIO code and instead gets the irq passed
up from the underlying transport (ie i2c-core).

Signed-off-by: Andrew Duggan <aduggan@...aptics.com>
---
Hi Dmitry,

I went ahead and removed the GPIO handling code. If we end up needing GPIO
support in the future it sounds like the right thing go to would be to
reimplement it using the gpiod API.

Thanks,
Andrew

 drivers/input/rmi4/rmi_bus.h    |  3 ++
 drivers/input/rmi4/rmi_driver.c | 81 +++++++----------------------------------
 drivers/input/rmi4/rmi_driver.h |  2 -
 drivers/input/rmi4/rmi_i2c.c    | 27 ++------------
 include/linux/rmi.h             | 19 ----------
 5 files changed, 20 insertions(+), 112 deletions(-)

diff --git a/drivers/input/rmi4/rmi_bus.h b/drivers/input/rmi4/rmi_bus.h
index d4cfc85..4e3bca3 100644
--- a/drivers/input/rmi4/rmi_bus.h
+++ b/drivers/input/rmi4/rmi_bus.h
@@ -175,6 +175,9 @@ struct rmi_transport_dev {
 	struct device *dev;
 	struct rmi_device *rmi_dev;
 
+	int irq;
+	int irq_flags;
+
 	irqreturn_t (*irq_thread)(int irq, void *p);
 	irqreturn_t (*hard_irq)(int irq, void *p);
 
diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index b9db709..585bd7b 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -20,7 +20,6 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/fs.h>
-#include <linux/gpio.h>
 #include <linux/kconfig.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -42,27 +41,18 @@
 
 #define DEFAULT_POLL_INTERVAL_MS	13
 
-#define IRQ_DEBUG(data) (IS_ENABLED(CONFIG_RMI4_DEBUG) && data->irq_debug)
-
 static irqreturn_t rmi_irq_thread(int irq, void *p)
 {
 	struct rmi_transport_dev *xport = p;
 	struct rmi_device *rmi_dev = xport->rmi_dev;
 	struct rmi_driver *driver = rmi_dev->driver;
-	struct rmi_device_platform_data *pdata = xport->dev->platform_data;
 	struct rmi_driver_data *data;
 
 	data = dev_get_drvdata(&rmi_dev->dev);
 
-	if (IRQ_DEBUG(data))
-		dev_dbg(xport->dev, "ATTN gpio, value: %d.\n",
-				gpio_get_value(pdata->attn_gpio));
-
-	if (gpio_get_value(pdata->attn_gpio) == pdata->attn_polarity) {
-		data->attn_count++;
-		if (driver && driver->irq_handler && rmi_dev)
-			driver->irq_handler(rmi_dev, irq);
-	}
+	data->attn_count++;
+	if (driver && driver->irq_handler && rmi_dev)
+		driver->irq_handler(rmi_dev, irq);
 
 	return IRQ_HANDLED;
 }
@@ -124,15 +114,15 @@ static void disable_sensor(struct rmi_device *rmi_dev)
 	if (!data->enabled)
 		return;
 
-	if (!data->irq)
+	if (!rmi_dev->xport->irq)
 		disable_polling(rmi_dev);
 
 	if (rmi_dev->xport->ops->disable_device)
 		rmi_dev->xport->ops->disable_device(rmi_dev->xport);
 
-	if (data->irq) {
-		disable_irq(data->irq);
-		free_irq(data->irq, rmi_dev->xport);
+	if (rmi_dev->xport->irq > 0) {
+		disable_irq(rmi_dev->xport->irq);
+		free_irq(rmi_dev->xport->irq, rmi_dev->xport);
 	}
 
 	data->enabled = false;
@@ -154,12 +144,12 @@ static int enable_sensor(struct rmi_device *rmi_dev)
 	}
 
 	xport = rmi_dev->xport;
-	if (data->irq) {
-		retval = request_threaded_irq(data->irq,
+	if (xport->irq > 0) {
+		retval = request_threaded_irq(xport->irq,
 				xport->hard_irq ? xport->hard_irq : NULL,
 				xport->irq_thread ?
 					xport->irq_thread : rmi_irq_thread,
-				data->irq_flags,
+				xport->irq_flags,
 				dev_name(&rmi_dev->dev), xport);
 		if (retval)
 			return retval;
@@ -717,15 +707,10 @@ static int rmi_driver_remove(struct device *dev)
 {
 	struct rmi_device *rmi_dev = to_rmi_device(dev);
 	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
-	const struct rmi_device_platform_data *pdata =
-					rmi_get_platform_data(rmi_dev);
 
 	disable_sensor(rmi_dev);
 	rmi_free_function_list(rmi_dev);
 
-	if (data->gpio_held)
-		gpio_free(pdata->attn_gpio);
-
 	kfree(data->irq_status);
 	kfree(data);
 
@@ -866,47 +851,9 @@ static int rmi_driver_probe(struct device *dev)
 		mutex_init(&data->suspend_mutex);
 	}
 
-	if (gpio_is_valid(pdata->attn_gpio)) {
-		static const char GPIO_LABEL[] = "attn";
-		unsigned long gpio_flags = GPIOF_DIR_IN;
-
-		data->irq = gpio_to_irq(pdata->attn_gpio);
-		if (pdata->level_triggered) {
-			data->irq_flags = IRQF_ONESHOT |
-				((pdata->attn_polarity == RMI_ATTN_ACTIVE_HIGH)
-				? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW);
-		} else {
-			data->irq_flags =
-				(pdata->attn_polarity == RMI_ATTN_ACTIVE_HIGH)
-				? IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
-		}
-
-		if (IS_ENABLED(CONFIG_RMI4_DEV))
-			gpio_flags |= GPIOF_EXPORT;
-
-		retval = gpio_request_one(pdata->attn_gpio, gpio_flags,
-					  GPIO_LABEL);
-		if (retval) {
-			dev_warn(dev, "WARNING: Failed to request ATTN gpio %d, code=%d.\n",
-				 pdata->attn_gpio, retval);
-			retval = 0;
-		} else {
-			dev_info(dev, "Obtained ATTN gpio %d.\n",
-					pdata->attn_gpio);
-			data->gpio_held = true;
-			if (IS_ENABLED(CONFIG_RMI4_DEV)) {
-				retval = gpio_export_link(dev,
-						GPIO_LABEL, pdata->attn_gpio);
-				if (retval) {
-					dev_warn(dev,
-						"WARNING: Failed to symlink ATTN gpio!\n");
-					retval = 0;
-				} else {
-					dev_info(dev, "Exported ATTN gpio %d.",
-						pdata->attn_gpio);
-				}
-			}
-		}
+	if (rmi_dev->xport->irq > 0) {
+		if (!rmi_dev->xport->hard_irq)
+			rmi_dev->xport->irq_flags = IRQF_ONESHOT;
 	} else {
 		data->poll_interval = ktime_set(0,
 			(pdata->poll_interval_ms ? pdata->poll_interval_ms :
@@ -924,8 +871,6 @@ err_destroy_functions:
 	rmi_free_function_list(rmi_dev);
 	kfree(irq_memory);
 err_free_mem:
-	if (data->gpio_held)
-		gpio_free(pdata->attn_gpio);
 	kfree(data);
 	return retval < 0 ? retval : 0;
 }
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index 34f7a7d..ad69962 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -38,8 +38,6 @@ struct rmi_driver_data {
 	bool f01_bootloader_mode;
 
 	u32 attn_count;
-	u32 irq_debug;	/* Should be bool, but debugfs wants u32 */
-	bool gpio_held;
 	int irq;
 	int irq_flags;
 	int num_of_irq_regs;
diff --git a/drivers/input/rmi4/rmi_i2c.c b/drivers/input/rmi4/rmi_i2c.c
index 24d8a04..cf537c9 100644
--- a/drivers/input/rmi4/rmi_i2c.c
+++ b/drivers/input/rmi4/rmi_i2c.c
@@ -196,9 +196,9 @@ static int rmi_i2c_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	dev_dbg(&client->dev, "Probing %s at %#02x (GPIO %d).\n",
+	dev_dbg(&client->dev, "Probing %s at %#02x.\n",
 		pdata->sensor_name ? pdata->sensor_name : "-no name-",
-		client->addr, pdata->attn_gpio);
+		client->addr);
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev,
@@ -206,15 +206,6 @@ static int rmi_i2c_probe(struct i2c_client *client,
 		return -ENODEV;
 	}
 
-	if (pdata->gpio_config) {
-		retval = pdata->gpio_config(pdata->gpio_data, true);
-		if (retval < 0) {
-			dev_err(&client->dev, "Failed to configure GPIOs, code: %d.\n",
-				retval);
-			return retval;
-		}
-	}
-
 	rmi_i2c = devm_kzalloc(&client->dev, sizeof(struct rmi_i2c_xport),
 				GFP_KERNEL);
 	if (!rmi_i2c)
@@ -226,6 +217,7 @@ static int rmi_i2c_probe(struct i2c_client *client,
 	rmi_i2c->xport.dev = &client->dev;
 	rmi_i2c->xport.proto_name = "i2c";
 	rmi_i2c->xport.ops = &rmi_i2c_ops;
+	rmi_i2c->xport.irq = client->irq;
 
 	/*
 	 * Setting the page to zero will (a) make sure the PSR is in a
@@ -241,7 +233,7 @@ static int rmi_i2c_probe(struct i2c_client *client,
 	if (retval) {
 		dev_err(&client->dev, "Failed to register transport driver at 0x%.2X.\n",
 			client->addr);
-		goto err_gpio;
+		return retval;
 	}
 
 	i2c_set_clientdata(client, rmi_i2c);
@@ -249,25 +241,14 @@ static int rmi_i2c_probe(struct i2c_client *client,
 	dev_info(&client->dev, "registered rmi i2c driver at %#04x.\n",
 			client->addr);
 	return 0;
-
-err_gpio:
-	if (pdata->gpio_config)
-		pdata->gpio_config(pdata->gpio_data, false);
-
-	return retval;
 }
 
 static int rmi_i2c_remove(struct i2c_client *client)
 {
-	const struct rmi_device_platform_data *pdata =
-				dev_get_platdata(&client->dev);
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 
 	rmi_unregister_transport_device(&rmi_i2c->xport);
 
-	if (pdata->gpio_config)
-		pdata->gpio_config(pdata->gpio_data, false);
-
 	return 0;
 }
 
diff --git a/include/linux/rmi.h b/include/linux/rmi.h
index ca35b2f..2f3c79d 100644
--- a/include/linux/rmi.h
+++ b/include/linux/rmi.h
@@ -206,19 +206,6 @@ struct rmi_device_platform_data_spi {
  * @firmware_name - if specified will override default firmware name,
  * for reflashing.
  *
- * @attn_gpio - the index of a GPIO that will be used to provide the ATTN
- * interrupt from the touch sensor.
- * @attn_polarity - indicates whether ATTN is active high or low.
- * @level_triggered - by default, the driver uses edge triggered interrupts.
- * However, this can cause problems with suspend/resume on some platforms.  In
- * that case, set this to 1 to use level triggered interrupts.
- * @gpio_config - a routine that will be called when the driver is loaded to
- * perform any platform specific GPIO configuration, and when it is unloaded
- * for GPIO de-configuration.  This is typically used to configure the ATTN
- * GPIO and the I2C or SPI pins, if necessary.
- * @gpio_data - platform specific data to be passed to the GPIO configuration
- * function.
- *
  * @poll_interval_ms - the time in milliseconds between reads of the interrupt
  * status register.  This is ignored if attn_gpio is non-zero.
  *
@@ -256,12 +243,6 @@ struct rmi_device_platform_data_spi {
 struct rmi_device_platform_data {
 	char *sensor_name;	/* Used for diagnostics. */
 
-	int attn_gpio;
-	enum rmi_attn_polarity attn_polarity;
-	bool level_triggered;
-	void *gpio_data;
-	int (*gpio_config)(void *gpio_data, bool configure);
-
 	int poll_interval_ms;
 
 	int reset_delay_ms;
-- 
2.1.4

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