projects / deliverable / linux.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 | ||
| 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 | ||
| 2be00173 GR |
37 | if (flags & GPIOF_ACTIVE_LOW) |
| 38 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
| 39 | ||
| 122c94de AC |
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); |