projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| dae5f0af | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 122c94de AC |
2 | #include <linux/gpio/consumer.h> |
| 3 | #include <linux/gpio/driver.h> | |
| 4 | ||
| 5 | #include <linux/gpio.h> | |
| 6 | ||
| 7 | #include "gpiolib.h" | |
| 8 | ||
| 9 | void gpio_free(unsigned gpio) | |
| 10 | { | |
| 11 | gpiod_free(gpio_to_desc(gpio)); | |
| 12 | } | |
| 13 | EXPORT_SYMBOL_GPL(gpio_free); | |
| 14 | ||
| 15 | /** | |
| 16 | * gpio_request_one - request a single GPIO with initial configuration | |
| 17 | * @gpio: the GPIO number | |
| 18 | * @flags: GPIO configuration as specified by GPIOF_* | |
| 19 | * @label: a literal description string of this GPIO | |
| 20 | */ | |
| 21 | int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) | |
| 22 | { | |
| 23 | struct gpio_desc *desc; | |
| 24 | int err; | |
| 25 | ||
| 26 | desc = gpio_to_desc(gpio); | |
| 27 | ||
| 0e9a5edf AC |
28 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ |
| 29 | if (!desc && gpio_is_valid(gpio)) | |
| 30 | return -EPROBE_DEFER; | |
| 31 | ||
| 85b03b30 JH |
32 | err = gpiod_request(desc, label); |
| 33 | if (err) | |
| 34 | return err; | |
| 35 | ||
| 122c94de AC |
36 | if (flags & GPIOF_OPEN_DRAIN) |
| 37 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
| 38 | ||
| 39 | if (flags & GPIOF_OPEN_SOURCE) | |
| 40 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
| 41 | ||
| 2be00173 GR |
42 | if (flags & GPIOF_ACTIVE_LOW) |
| 43 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
| 44 | ||
| 122c94de AC |
45 | if (flags & GPIOF_DIR_IN) |
| 46 | err = gpiod_direction_input(desc); | |
| 47 | else | |
| 48 | err = gpiod_direction_output_raw(desc, | |
| 49 | (flags & GPIOF_INIT_HIGH) ? 1 : 0); | |
| 50 | ||
| 51 | if (err) | |
| 52 | goto free_gpio; | |
| 53 | ||
| 54 | if (flags & GPIOF_EXPORT) { | |
| 55 | err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE); | |
| 56 | if (err) | |
| 57 | goto free_gpio; | |
| 58 | } | |
| 59 | ||
| 60 | return 0; | |
| 61 | ||
| 62 | free_gpio: | |
| 63 | gpiod_free(desc); | |
| 64 | return err; | |
| 65 | } | |
| 66 | EXPORT_SYMBOL_GPL(gpio_request_one); | |
| 67 | ||
| 68 | int gpio_request(unsigned gpio, const char *label) | |
| 69 | { | |
| 0e9a5edf AC |
70 | struct gpio_desc *desc = gpio_to_desc(gpio); |
| 71 | ||
| 72 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ | |
| 73 | if (!desc && gpio_is_valid(gpio)) | |
| 74 | return -EPROBE_DEFER; | |
| 75 | ||
| 76 | return gpiod_request(desc, label); | |
| 122c94de AC |
77 | } |
| 78 | EXPORT_SYMBOL_GPL(gpio_request); | |
| 79 | ||
| 80 | /** | |
| 81 | * gpio_request_array - request multiple GPIOs in a single call | |
| 82 | * @array: array of the 'struct gpio' | |
| 83 | * @num: how many GPIOs in the array | |
| 84 | */ | |
| 85 | int gpio_request_array(const struct gpio *array, size_t num) | |
| 86 | { | |
| 87 | int i, err; | |
| 88 | ||
| 89 | for (i = 0; i < num; i++, array++) { | |
| 90 | err = gpio_request_one(array->gpio, array->flags, array->label); | |
| 91 | if (err) | |
| 92 | goto err_free; | |
| 93 | } | |
| 94 | return 0; | |
| 95 | ||
| 96 | err_free: | |
| 97 | while (i--) | |
| 98 | gpio_free((--array)->gpio); | |
| 99 | return err; | |
| 100 | } | |
| 101 | EXPORT_SYMBOL_GPL(gpio_request_array); | |
| 102 | ||
| 103 | /** | |
| 104 | * gpio_free_array - release multiple GPIOs in a single call | |
| 105 | * @array: array of the 'struct gpio' | |
| 106 | * @num: how many GPIOs in the array | |
| 107 | */ | |
| 108 | void gpio_free_array(const struct gpio *array, size_t num) | |
| 109 | { | |
| 110 | while (num--) | |
| 111 | gpio_free((array++)->gpio); | |
| 112 | } | |
| 113 | EXPORT_SYMBOL_GPL(gpio_free_array); |