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         /* Compatibility: assume unavailable "valid" GPIOs will appear later */
  28         if (!desc && gpio_is_valid(gpio))
  29                 return -EPROBE_DEFER;
  30
  31         err = gpiod_request(desc, label);
  32         if (err)
  33                 return err;
  34
  35         if (flags & GPIOF_OPEN_DRAIN)
  36                 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
  37
  38         if (flags & GPIOF_OPEN_SOURCE)
  39                 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
  40
  41         if (flags & GPIOF_ACTIVE_LOW)
  42                 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
  43
  44         if (flags & GPIOF_DIR_IN)
  45                 err = gpiod_direction_input(desc);
  46         else
  47                 err = gpiod_direction_output_raw(desc,
  48                                 (flags & GPIOF_INIT_HIGH) ? 1 : 0);
  49
  50         if (err)
  51                 goto free_gpio;
  52
  53         if (flags & GPIOF_EXPORT) {
  54                 err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
  55                 if (err)
  56                         goto free_gpio;
  57         }
  58
  59         return 0;
  60
  61  free_gpio:
  62         gpiod_free(desc);
  63         return err;
  64 }
  65 EXPORT_SYMBOL_GPL(gpio_request_one);
  66
  67 int gpio_request(unsigned gpio, const char *label)
  68 {
  69         struct gpio_desc *desc = gpio_to_desc(gpio);
  70
  71         /* Compatibility: assume unavailable "valid" GPIOs will appear later */
  72         if (!desc && gpio_is_valid(gpio))
  73                 return -EPROBE_DEFER;
  74
  75         return gpiod_request(desc, label);
  76 }
  77 EXPORT_SYMBOL_GPL(gpio_request);
  78
  79 /**
  80  * gpio_request_array - request multiple GPIOs in a single call
  81  * @array:      array of the 'struct gpio'
  82  * @num:        how many GPIOs in the array
  83  */
  84 int gpio_request_array(const struct gpio *array, size_t num)
  85 {
  86         int i, err;
  87
  88         for (i = 0; i < num; i++, array++) {
  89                 err = gpio_request_one(array->gpio, array->flags, array->label);
  90                 if (err)
  91                         goto err_free;
  92         }
  93         return 0;
  94
  95 err_free:
  96         while (i--)
  97                 gpio_free((--array)->gpio);
  98         return err;
  99 }
 100 EXPORT_SYMBOL_GPL(gpio_request_array);
 101
 102 /**
 103  * gpio_free_array - release multiple GPIOs in a single call
 104  * @array:      array of the 'struct gpio'
 105  * @num:        how many GPIOs in the array
 106  */
 107 void gpio_free_array(const struct gpio *array, size_t num)
 108 {
 109         while (num--)
 110                 gpio_free((array++)->gpio);
 111 }
 112 EXPORT_SYMBOL_GPL(gpio_free_array);