1 // SPDX-License-Identifier: GPL-2.0 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 28 /* Compatibility: assume unavailable "valid" GPIOs will appear later */ 29 if (!desc && gpio_is_valid(gpio)) 30 return -EPROBE_DEFER; 31 32 err = gpiod_request(desc, label); 33 if (err) 34 return err; 35 36 if (flags & GPIOF_ACTIVE_LOW) 37 set_bit(FLAG_ACTIVE_LOW, &desc->flags); 38 39 if (flags & GPIOF_DIR_IN) 40 err = gpiod_direction_input(desc); 41 else 42 err = gpiod_direction_output_raw(desc, 43 (flags & GPIOF_INIT_HIGH) ? 1 : 0); 44 45 if (err) 46 goto free_gpio; 47 48 return 0; 49 50 free_gpio: 51 gpiod_free(desc); 52 return err; 53 } 54 EXPORT_SYMBOL_GPL(gpio_request_one); 55 56 int gpio_request(unsigned gpio, const char *label) 57 { 58 struct gpio_desc *desc = gpio_to_desc(gpio); 59 60 /* Compatibility: assume unavailable "valid" GPIOs will appear later */ 61 if (!desc && gpio_is_valid(gpio)) 62 return -EPROBE_DEFER; 63 64 return gpiod_request(desc, label); 65 } 66 EXPORT_SYMBOL_GPL(gpio_request); 67 68 /** 69 * gpio_request_array - request multiple GPIOs in a single call 70 * @array: array of the 'struct gpio' 71 * @num: how many GPIOs in the array 72 */ 73 int gpio_request_array(const struct gpio *array, size_t num) 74 { 75 int i, err; 76 77 for (i = 0; i < num; i++, array++) { 78 err = gpio_request_one(array->gpio, array->flags, array->label); 79 if (err) 80 goto err_free; 81 } 82 return 0; 83 84 err_free: 85 while (i--) 86 gpio_free((--array)->gpio); 87 return err; 88 } 89 EXPORT_SYMBOL_GPL(gpio_request_array); 90 91 /** 92 * gpio_free_array - release multiple GPIOs in a single call 93 * @array: array of the 'struct gpio' 94 * @num: how many GPIOs in the array 95 */ 96 void gpio_free_array(const struct gpio *array, size_t num) 97 { 98 while (num--) 99 gpio_free((array++)->gpio); 100 } 101 EXPORT_SYMBOL_GPL(gpio_free_array); 102