projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 122c94de AC |
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 | ||
| 0e9a5edf AC |
27 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ |
| 28 | if (!desc && gpio_is_valid(gpio)) | |
| 29 | return -EPROBE_DEFER; | |
| 30 | ||
| 85b03b30 JH |
31 | err = gpiod_request(desc, label); |
| 32 | if (err) | |
| 33 | return err; | |
| 34 | ||
| 122c94de AC |
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 | ||
| 2be00173 GR |
41 | if (flags & GPIOF_ACTIVE_LOW) |
| 42 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
| 43 | ||
| 122c94de AC |
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 | { | |
| 0e9a5edf AC |
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); | |
| 122c94de AC |
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); |