msm: gpio: Add gpiomux calls to request and free.

Add gpiomux get and put calls to msmgpio request and free,
in order to allow gpio lines to be properly reference-counted
and power-managed.

Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>

arch/arm/mach-msm/gpio.c

@@ -21,6 +21,7 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include "gpio_hw.h"
+#include "gpiomux.h"
 
 #define FIRST_GPIO_IRQ MSM_GPIO_TO_INT(0)
 
@@ -44,6 +45,8 @@
 			.direction_input = msm_gpio_direction_input,	\
 			.direction_output = msm_gpio_direction_output,	\
 			.to_irq = msm_gpio_to_irq,			\
+			.request = msm_gpio_request,			\
+			.free = msm_gpio_free,				\
 		}							\
 	}
 
@@ -171,6 +174,21 @@ static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 	return MSM_GPIO_TO_INT(chip->base + offset);
 }
 
+#ifdef CONFIG_MSM_GPIOMUX
+static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	return msm_gpiomux_get(chip->base + offset);
+}
+
+static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	msm_gpiomux_put(chip->base + offset);
+}
+#else
+#define msm_gpio_request NULL
+#define msm_gpio_free NULL
+#endif
+
 struct msm_gpio_chip msm_gpio_chips[] = {
 #if defined(CONFIG_ARCH_MSM7X00A)
 	MSM_GPIO_BANK(0,   0,  15),