omap: 4430sdp board support for proximity sensor

omap 4430sdp board support for the  proximity sensor via GPIO keys.
The proximity sensor is connected to GPIO and is registered as a
GPIO key.
- Making the default state of the sensor off at bootup
- The init is called before platform_add_devices

Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index 5b6a48dad86f..d2b917382b42 100644
--- a/arch/arm/mach-omap2/board-4430sdp.c
+++ b/arch/arm/mach-omap2/board-4430sdp.c
@@ -20,6 +20,7 @@
 #include <linux/usb/otg.h>
 #include <linux/spi/spi.h>
 #include <linux/i2c/twl.h>
+#include <linux/gpio_keys.h>
 #include <linux/regulator/machine.h>
 #include <linux/leds.h>
 
@@ -40,6 +41,8 @@
 #define ETH_KS8851_IRQ                  34
 #define ETH_KS8851_POWER_ON             48
 #define ETH_KS8851_QUART                138
+#define OMAP4_SFH7741_SENSOR_OUTPUT_GPIO        184
+#define OMAP4_SFH7741_ENABLE_GPIO               188
 
 static struct gpio_led sdp4430_gpio_leds[] = {
         {
@@ -77,11 +80,47 @@ static struct gpio_led sdp4430_gpio_leds[] = {
 
 };
 
+static struct gpio_keys_button sdp4430_gpio_keys[] = {
+        {
+                .desc                   = "Proximity Sensor",
+                .type                   = EV_SW,
+                .code                   = SW_FRONT_PROXIMITY,
+                .gpio                   = OMAP4_SFH7741_SENSOR_OUTPUT_GPIO,
+                .active_low             = 0,
+        }
+};
+
 static struct gpio_led_platform_data sdp4430_led_data = {
         .leds   = sdp4430_gpio_leds,
         .num_leds       = ARRAY_SIZE(sdp4430_gpio_leds),
 };
 
+static int omap_prox_activate(struct device *dev)
+{
+        gpio_set_value(OMAP4_SFH7741_ENABLE_GPIO , 1);
+        return 0;
+}
+
+static void omap_prox_deactivate(struct device *dev)
+{
+        gpio_set_value(OMAP4_SFH7741_ENABLE_GPIO , 0);
+}
+
+static struct gpio_keys_platform_data sdp4430_gpio_keys_data = {
+        .buttons        = sdp4430_gpio_keys,
+        .nbuttons       = ARRAY_SIZE(sdp4430_gpio_keys),
+        .enable         = omap_prox_activate,
+        .disable        = omap_prox_deactivate,
+};
+
+static struct platform_device sdp4430_gpio_keys_device = {
+        .name   = "gpio-keys",
+        .id     = -1,
+        .dev    = {
+                .platform_data  = &sdp4430_gpio_keys_data,
+        },
+};
+
 static struct platform_device sdp4430_leds_gpio = {
         .name   = "leds-gpio",
         .id     = -1,
@@ -161,6 +200,7 @@ static struct platform_device sdp4430_lcd_device = {
 
 static struct platform_device *sdp4430_devices[] __initdata = {
         &sdp4430_lcd_device,
+        &sdp4430_gpio_keys_device,
         &sdp4430_leds_gpio,
 };
 
@@ -432,11 +472,32 @@ static int __init omap4_i2c_init(void)
                                 ARRAY_SIZE(sdp4430_i2c_4_boardinfo));
         return 0;
 }
+
+static void __init omap_sfh7741prox_init(void)
+{
+        int  error;
+
+        error = gpio_request(OMAP4_SFH7741_ENABLE_GPIO, "sfh7741");
+        if (error < 0) {
+                pr_err("%s:failed to request GPIO %d, error %d\n",
+                        __func__, OMAP4_SFH7741_ENABLE_GPIO, error);
+                return;
+        }
+
+        error = gpio_direction_output(OMAP4_SFH7741_ENABLE_GPIO , 0);
+        if (error < 0) {
+                pr_err("%s: GPIO configuration failed: GPIO %d,error %d\n",
+                         __func__, OMAP4_SFH7741_ENABLE_GPIO, error);
+                gpio_free(OMAP4_SFH7741_ENABLE_GPIO);
+        }
+}
+
 static void __init omap_4430sdp_init(void)
 {
         int status;
 
         omap4_i2c_init();
+        omap_sfh7741prox_init();
         platform_add_devices(sdp4430_devices, ARRAY_SIZE(sdp4430_devices));
         omap_serial_init();
         omap4_twl6030_hsmmc_init(mmc);