include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...

[mv-sheeva.git] / drivers / gpio / gpiolib.c

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 350842ad3632abc46469cd9c6835488a03b771db..76be229c814d40479f37d158c9cc1532a94e9b33 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -9,6 +9,7 @@
 #include <linux/seq_file.h>
 #include <linux/gpio.h>
 #include <linux/idr.h>
+#include <linux/slab.h>
 
 
 /* Optional implementation infrastructure for GPIO interfaces.
@@ -623,7 +624,9 @@ static const struct attribute_group gpiochip_attr_group = {
  * /sys/class/gpio/unexport ... write-only
  *     integer N ... number of GPIO to unexport
  */
-static ssize_t export_store(struct class *class, const char *buf, size_t len)
+static ssize_t export_store(struct class *class,
+                               struct class_attribute *attr,
+                               const char *buf, size_t len)
 {
        long    gpio;
        int     status;
@@ -653,7 +656,9 @@ done:
        return status ? : len;
 }
 
-static ssize_t unexport_store(struct class *class, const char *buf, size_t len)
+static ssize_t unexport_store(struct class *class,
+                               struct class_attribute *attr,
+                               const char *buf, size_t len)
 {
        long    gpio;
        int     status;
@@ -1237,6 +1242,64 @@ void gpio_free(unsigned gpio)
 }
 EXPORT_SYMBOL_GPL(gpio_free);
 
+/**
+ * gpio_request_one - request a single GPIO with initial configuration
+ * @gpio:      the GPIO number
+ * @flags:     GPIO configuration as specified by GPIOF_*
+ * @label:     a literal description string of this GPIO
+ */
+int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
+{
+       int err;
+
+       err = gpio_request(gpio, label);
+       if (err)
+               return err;
+
+       if (flags & GPIOF_DIR_IN)
+               err = gpio_direction_input(gpio);
+       else
+               err = gpio_direction_output(gpio,
+                               (flags & GPIOF_INIT_HIGH) ? 1 : 0);
+
+       return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_one);
+
+/**
+ * gpio_request_array - request multiple GPIOs in a single call
+ * @array:     array of the 'struct gpio'
+ * @num:       how many GPIOs in the array
+ */
+int gpio_request_array(struct gpio *array, size_t num)
+{
+       int i, err;
+
+       for (i = 0; i < num; i++, array++) {
+               err = gpio_request_one(array->gpio, array->flags, array->label);
+               if (err)
+                       goto err_free;
+       }
+       return 0;
+
+err_free:
+       while (i--)
+               gpio_free((--array)->gpio);
+       return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_array);
+
+/**
+ * gpio_free_array - release multiple GPIOs in a single call
+ * @array:     array of the 'struct gpio'
+ * @num:       how many GPIOs in the array
+ */
+void gpio_free_array(struct gpio *array, size_t num)
+{
+       while (num--)
+               gpio_free((array++)->gpio);
+}
+EXPORT_SYMBOL_GPL(gpio_free_array);
 
 /**
  * gpiochip_is_requested - return string iff signal was requested