input: touchscreen: added platform data for Fusion touchscreen

Added platform data struct to define interrupt and reset GPIO. This
allows to initialize the touchscreen controller inside the driver
rather then in each platform and use the driver as a module.
(cherry picked from commit cb82730b70f31af3b43041ac4e47de69c18016c9)

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/fusion_F0710A.c b/drivers/input/touchscreen/fusion_F0710A.c
index 44942b3dbcb4..75c7011a36e3 100644
--- a/drivers/input/touchscreen/fusion_F0710A.c
+++ b/drivers/input/touchscreen/fusion_F0710A.c
@@ -16,6 +16,7 @@
 #include <linux/delay.h>
 #include <asm/irq.h>
 #include <linux/gpio.h>
+#include <linux/input/fusion_F0710A.h>
 
 #include "fusion_F0710A.h"
 
@@ -264,10 +265,52 @@ const static u8* g_ver_product[4] = {
 
 static int fusion_F0710A_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 {
+	struct fusion_f0710a_init_data *pdata = i2c->dev.platform_data;
 	int ret;
 	u8 ver_product, ver_id;
 	u32 version;
 
+	if (pdata == NULL)
+	{
+		dev_err(&i2c->dev, "No platform data for Fusion driver\n");
+		return -ENODEV;
+	}
+
+	/* Request pinmuxing, if necessary */
+	if (pdata->pinmux_fusion_pins != NULL)
+	{
+		ret = pdata->pinmux_fusion_pins();
+		if (ret < 0) {
+			dev_err(&i2c->dev, "muxing GPIOs failed\n");
+			return -ENODEV;
+		}
+	}
+
+	if ((gpio_request(pdata->gpio_int, "SO-DIMM 28 (Iris X16-38 Pen)") == 0) &&
+	    (gpio_direction_input(pdata->gpio_int) == 0)) {
+		gpio_export(pdata->gpio_int, 0);
+	} else {
+		printk(KERN_WARNING "Could not obtain GPIO for Fusion pen down\n");
+		return -ENODEV;
+	}
+
+	if ((gpio_request(pdata->gpio_reset, "SO-DIMM 30 (Iris X16-39 RST)") == 0) &&
+	    (gpio_direction_output(pdata->gpio_reset, 1) == 0)) {
+
+		/* Generate a 0 => 1 edge explicitly... */
+		gpio_set_value(pdata->gpio_reset, 0);
+		mdelay(10);
+		gpio_set_value(pdata->gpio_reset, 1);
+
+		gpio_export(pdata->gpio_reset, 0);
+	} else {
+		printk(KERN_WARNING "Could not obtain GPIO for Fusion reset\n");
+		return -ENODEV;
+	}
+
+	/* Use Pen Down GPIO as sampling interrupt */
+	i2c->irq = gpio_to_irq(pdata->gpio_int);
+
 	if(!i2c->irq)
 	{
 		dev_err(&i2c->dev, "fusion_F0710A irq < 0 \n");
@@ -390,6 +433,10 @@ static int fusion_F0710A_resume(struct i2c_client *i2c)
 
 static int fusion_F0710A_remove(struct i2c_client *i2c)
 {
+	struct fusion_f0710a_init_data *pdata = i2c->dev.platform_data;
+
+	gpio_free(pdata->gpio_int);
+	gpio_free(pdata->gpio_reset);
 	destroy_workqueue(fusion_F0710A.workq);
 	free_irq(i2c->irq, &fusion_F0710A);
 	input_unregister_device(fusion_F0710A.input);