drivers/gpio/gpiolib-legacy.c

   1 #include <linux/gpio/consumer.h>
   2 #include <linux/gpio/driver.h>
   3
   4 #include <linux/gpio.h>
   5
   6 #include "gpiolib.h"
   7
   8 void gpio_free(unsigned gpio)
   9 {
  10         gpiod_free(gpio_to_desc(gpio));
  11 }
  12 EXPORT_SYMBOL_GPL(gpio_free);
  13
  14 /**
  15  * gpio_request_one - request a single GPIO with initial configuration
  16  * @gpio:       the GPIO number
  17  * @flags:      GPIO configuration as specified by GPIOF_*
  18  * @label:      a literal description string of this GPIO
  19  */
  20 int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
  21 {
  22         struct gpio_desc *desc;
  23         int err;
  24
  25         desc = gpio_to_desc(gpio);
  26
  27         err = gpiod_request(desc, label);
  28         if (err)
  29                 return err;
  30
  31         if (flags & GPIOF_OPEN_DRAIN)
  32                 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
  33
  34         if (flags & GPIOF_OPEN_SOURCE)
  35                 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
  36
  37         if (flags & GPIOF_ACTIVE_LOW)
  38                 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
  39
  40         if (flags & GPIOF_DIR_IN)
  41                 err = gpiod_direction_input(desc);
  42         else
  43                 err = gpiod_direction_output_raw(desc,
  44                                 (flags & GPIOF_INIT_HIGH) ? 1 : 0);
  45
  46         if (err)
  47                 goto free_gpio;
  48
  49         if (flags & GPIOF_EXPORT) {
  50                 err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
  51                 if (err)
  52                         goto free_gpio;
  53         }
  54
  55         return 0;
  56
  57  free_gpio:
  58         gpiod_free(desc);
  59         return err;
  60 }
  61 EXPORT_SYMBOL_GPL(gpio_request_one);
  62
  63 int gpio_request(unsigned gpio, const char *label)
  64 {
  65         return gpiod_request(gpio_to_desc(gpio), label);
  66 }
  67 EXPORT_SYMBOL_GPL(gpio_request);
  68
  69 /**
  70  * gpio_request_array - request multiple GPIOs in a single call
  71  * @array:      array of the 'struct gpio'
  72  * @num:        how many GPIOs in the array
  73  */
  74 int gpio_request_array(const struct gpio *array, size_t num)
  75 {
  76         int i, err;
  77
  78         for (i = 0; i < num; i++, array++) {
  79                 err = gpio_request_one(array->gpio, array->flags, array->label);
  80                 if (err)
  81                         goto err_free;
  82         }
  83         return 0;
  84
  85 err_free:
  86         while (i--)
  87                 gpio_free((--array)->gpio);
  88         return err;
  89 }
  90 EXPORT_SYMBOL_GPL(gpio_request_array);
  91
  92 /**
  93  * gpio_free_array - release multiple GPIOs in a single call
  94  * @array:      array of the 'struct gpio'
  95  * @num:        how many GPIOs in the array
  96  */
  97 void gpio_free_array(const struct gpio *array, size_t num)
  98 {
  99         while (num--)
 100                 gpio_free((array++)->gpio);
 101 }
 102 EXPORT_SYMBOL_GPL(gpio_free_array);