[PATCH 02/11] Input: synaptics-rmi4 - add a common input device in rmi_driver

[Benjamin Tissoires <benjamin.tissoires@redhat.com>]

When .unified_input is set to true in the platform data, the
functions should rely on the common input node created by rmi_driver
to forward events instead of having their own input node.

This node is named "Synaptics PRODUCT_ID" to be able to
differentiate the various models.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 drivers/input/rmi4/rmi_driver.c | 43 +++++++++++++++++++++++++++++++++++++++++
 drivers/input/rmi4/rmi_driver.h |  6 ++++++
 drivers/input/rmi4/rmi_f01.c    |  7 +++++++
 include/linux/rmi.h             |  2 ++
 4 files changed, 58 insertions(+)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index b9db709..95f9386 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -310,6 +310,9 @@ static int process_interrupt_requests(struct rmi_device *rmi_dev)
 		if (entry->irq_mask)
 			process_one_interrupt(data, entry);
 
+	if (data->input)
+		input_sync(data->input);
+
 	return 0;
 }
 
@@ -330,6 +333,25 @@ static int rmi_driver_set_input_params(struct rmi_device *rmi_dev,
 	return 0;
 }
 
+static void rmi_driver_set_input_name(struct rmi_device *rmi_dev,
+				struct input_dev *input)
+{
+	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
+	char *device_name = rmi_f01_get_product_ID(data->f01_container);
+	char *name;
+
+	if (!device_name)
+		return;
+
+	name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL,
+			      "Synaptics %s", device_name);
+	if (!name)
+		return;
+
+	input->name = name;
+}
+
+
 static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev,
 				   unsigned long *mask)
 {
@@ -720,6 +742,8 @@ static int rmi_driver_remove(struct device *dev)
 	const struct rmi_device_platform_data *pdata =
 					rmi_get_platform_data(rmi_dev);
 
+	if (data->input)
+		input_unregister_device(data->input);
 	disable_sensor(rmi_dev);
 	rmi_free_function_list(rmi_dev);
 
@@ -832,6 +856,15 @@ static int rmi_driver_probe(struct device *dev)
 	data->current_irq_mask	= irq_memory + size * 2;
 	data->new_irq_mask	= irq_memory + size * 3;
 
+	if (pdata->unified_input) {
+		data->input = input_allocate_device();
+		if (data->input) {
+			rmi_driver_set_input_params(rmi_dev, data->input);
+			sprintf(data->input_phys, "%s/input0", dev_name(dev));
+			data->input->phys = data->input_phys;
+		}
+	}
+
 	irq_count = 0;
 	dev_dbg(dev, "Creating functions.");
 	retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_create_function);
@@ -866,6 +899,15 @@ static int rmi_driver_probe(struct device *dev)
 		mutex_init(&data->suspend_mutex);
 	}
 
+	if (data->input) {
+		rmi_driver_set_input_name(rmi_dev, data->input);
+		if (input_register_device(data->input)) {
+			dev_err(dev, "%s: Failed to register input device.\n",
+				__func__);
+			goto err_destroy_functions;
+		}
+	}
+
 	if (gpio_is_valid(pdata->attn_gpio)) {
 		static const char GPIO_LABEL[] = "attn";
 		unsigned long gpio_flags = GPIOF_DIR_IN;
@@ -921,6 +963,7 @@ static int rmi_driver_probe(struct device *dev)
 	return 0;
 
 err_destroy_functions:
+	input_free_device(data->input);
 	rmi_free_function_list(rmi_dev);
 	kfree(irq_memory);
 err_free_mem:
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index dda564f..36ca34b 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -13,6 +13,7 @@
 #include <linux/ctype.h>
 #include <linux/hrtimer.h>
 #include <linux/ktime.h>
+#include <linux/input.h>
 #include "rmi_bus.h"
 
 #define RMI_DRIVER_VERSION "1.6"
@@ -29,6 +30,8 @@
 
 #define RMI_PDT_PROPS_HAS_BSR 0x02
 
+#define NAME_BUFFER_SIZE 256
+
 struct rmi_driver_data {
 	struct list_head function_list;
 
@@ -49,6 +52,8 @@ struct rmi_driver_data {
 	unsigned long *current_irq_mask;
 	unsigned long *new_irq_mask;
 	struct mutex irq_mutex;
+	struct input_dev *input;
+	char input_phys[NAME_BUFFER_SIZE];
 
 	/* Following are used when polling. */
 	struct hrtimer poll_timer;
@@ -112,6 +117,7 @@ void rmi_unregister_physical_driver(void);
 
 int rmi_register_f01_handler(void);
 void rmi_unregister_f01_handler(void);
+char *rmi_f01_get_product_ID(struct rmi_function *fn);
 
 #ifdef CONFIG_RMI4_F11
 int rmi_register_f11_handler(void);
diff --git a/drivers/input/rmi4/rmi_f01.c b/drivers/input/rmi4/rmi_f01.c
index ee5f4a1..2d72dc8 100644
--- a/drivers/input/rmi4/rmi_f01.c
+++ b/drivers/input/rmi4/rmi_f01.c
@@ -176,6 +176,13 @@ static int rmi_f01_read_properties(struct rmi_device *rmi_dev,
 	return 0;
 }
 
+char *rmi_f01_get_product_ID(struct rmi_function *fn)
+{
+	struct f01_data *f01 = dev_get_drvdata(&fn->dev);
+
+	return f01->properties.product_id;
+}
+
 static int rmi_f01_probe(struct rmi_function *fn)
 {
 	struct rmi_device *rmi_dev = fn->rmi_dev;
diff --git a/include/linux/rmi.h b/include/linux/rmi.h
index ca35b2f..1d22985 100644
--- a/include/linux/rmi.h
+++ b/include/linux/rmi.h
@@ -277,6 +277,8 @@ struct rmi_device_platform_data {
 	struct rmi_f30_gpioled_map *gpioled_map;
 	struct rmi_button_map *f41_button_map;
 
+	bool unified_input;
+
 #ifdef CONFIG_RMI4_FWLIB
 	char *firmware_name;
 #endif
-- 
2.4.3