[patch 2.6.27-omap-git+ 2/5] twl4030-gpio use new gpiolib hooks

[David Brownell]

From: David Brownell <[EMAIL PROTECTED]>

Use the new gpiolib internal mechanism for tracking gpio usage,
making them power the GPIO module on/off, so that the standard
gpio_request()/gpio_free() calls can completely replace the
twl4030-specific versions.

Signed-off-by: David Brownell <[EMAIL PROTECTED]>
---
 drivers/gpio/twl4030-gpio.c |   77 ++++++++++++++++++++----------------------
 1 file changed, 37 insertions(+), 40 deletions(-)

--- a/drivers/gpio/twl4030-gpio.c
+++ b/drivers/gpio/twl4030-gpio.c
@@ -102,32 +102,10 @@ static inline int gpio_twl4030_read(u8 a
  */
 int twl4030_request_gpio(int gpio)
 {
-       int ret = 0;
-
        if (unlikely(gpio >= TWL4030_GPIO_MAX))
                return -EPERM;
 
-       ret = gpio_request(twl_gpiochip.base + gpio, NULL);
-       if (ret < 0)
-               return ret;
-
-       mutex_lock(&gpio_lock);
-       if (gpio_usage_count & BIT(gpio)) {
-               ret = -EBUSY;
-       } else {
-               /* First time usage? - switch on GPIO module */
-               if (!gpio_usage_count) {
-                       ret = gpio_twl4030_write(REG_GPIO_CTRL,
-                                       MASK_GPIO_CTRL_GPIO_ON);
-
-               }
-               if (!ret)
-                       gpio_usage_count |= BIT(gpio);
-               else
-                       gpio_free(twl_gpiochip.base + gpio);
-       }
-       mutex_unlock(&gpio_lock);
-       return ret;
+       return gpio_request(twl_gpiochip.base + gpio, NULL);
 }
 EXPORT_SYMBOL(twl4030_request_gpio);
 
@@ -136,26 +114,11 @@ EXPORT_SYMBOL(twl4030_request_gpio);
  */
 int twl4030_free_gpio(int gpio)
 {
-       int ret = 0;
-
        if (unlikely(gpio >= TWL4030_GPIO_MAX))
                return -EPERM;
 
-       mutex_lock(&gpio_lock);
-
-       if ((gpio_usage_count & BIT(gpio)) == 0) {
-               ret = -EPERM;
-       } else {
-               gpio_usage_count &= ~BIT(gpio);
-               gpio_free(twl_gpiochip.base + gpio);
-       }
-
-       /* Last time usage? - switch off GPIO module */
-       if (ret == 0 && !gpio_usage_count)
-               ret = gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
-
-       mutex_unlock(&gpio_lock);
-       return ret;
+       gpio_free(twl_gpiochip.base + gpio);
+       return 0;
 }
 EXPORT_SYMBOL(twl4030_free_gpio);
 
@@ -283,6 +246,38 @@ int twl4030_set_gpio_card_detect(int gpi
 
 /*----------------------------------------------------------------------*/
 
+static int twl_request(struct gpio_chip *chip, unsigned offset)
+{
+       int status = 0;
+
+       mutex_lock(&gpio_lock);
+
+       /* on first use, turn GPIO module "on" */
+       if (!gpio_usage_count)
+               status = gpio_twl4030_write(REG_GPIO_CTRL,
+                               MASK_GPIO_CTRL_GPIO_ON);
+
+       if (!status)
+               gpio_usage_count |= (0x1 << offset);
+
+done:
+       mutex_unlock(&gpio_lock);
+       return status;
+}
+
+static void twl_free(struct gpio_chip *chip, unsigned offset)
+{
+       mutex_lock(&gpio_lock);
+
+       gpio_usage_count &= ~BIT(offset);
+
+       /* on last use, switch off GPIO module */
+       if (!gpio_usage_count)
+               gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
+
+       mutex_unlock(&gpio_lock);
+}
+
 static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
 {
        return twl4030_set_gpio_direction(offset, 1);
@@ -316,6 +311,8 @@ static int twl_to_irq(struct gpio_chip *
 static struct gpio_chip twl_gpiochip = {
        .label                  = "twl4030",
        .owner                  = THIS_MODULE,
+       .request                = twl_request,
+       .free                   = twl_free,
        .direction_input        = twl_direction_in,
        .get                    = twl_get,
        .direction_output       = twl_direction_out,
--
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