git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 420818f9 AH |
1 | /* drivers/input/misc/gpio_output.c |
| 2 | * | |
| 3 | * Copyright (C) 2007 Google, Inc. | |
| 4 | * | |
| 5 | * This software is licensed under the terms of the GNU General Public | |
| 6 | * License version 2, as published by the Free Software Foundation, and | |
| 7 | * may be copied, distributed, and modified under those terms. | |
| 8 | * | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | * | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/kernel.h> | |
| 17 | #include <linux/gpio.h> | |
| 18 | #include <linux/gpio_event.h> | |
| 19 | ||
| 20 | int gpio_event_output_event( | |
| 21 | struct input_dev *input_dev, struct gpio_event_info *info, void **data, | |
| 22 | unsigned int type, unsigned int code, int value) | |
| 23 | { | |
| 24 | int i; | |
| 25 | struct gpio_event_output_info *oi; | |
| 26 | oi = container_of(info, struct gpio_event_output_info, info); | |
| 27 | if (type != oi->type) | |
| 28 | return 0; | |
| 29 | if (!(oi->flags & GPIOEDF_ACTIVE_HIGH)) | |
| 30 | value = !value; | |
| 31 | for (i = 0; i < oi->keymap_size; i++) | |
| 32 | if (code == oi->keymap[i].code) | |
| 33 | gpio_set_value(oi->keymap[i].gpio, value); | |
| 34 | return 0; | |
| 35 | } | |
| 36 | ||
| 37 | int gpio_event_output_func( | |
| 38 | struct input_dev *input_dev, struct gpio_event_info *info, void **data, | |
| 39 | int func) | |
| 40 | { | |
| 41 | int ret; | |
| 42 | int i; | |
| 43 | struct gpio_event_output_info *oi; | |
| 44 | oi = container_of(info, struct gpio_event_output_info, info); | |
| 45 | ||
| 46 | if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME) | |
| 47 | return 0; | |
| 48 | ||
| 49 | if (func == GPIO_EVENT_FUNC_INIT) { | |
| 50 | int output_level = !(oi->flags & GPIOEDF_ACTIVE_HIGH); | |
| 51 | for (i = 0; i < oi->keymap_size; i++) | |
| 52 | input_set_capability(input_dev, oi->type, | |
| 53 | oi->keymap[i].code); | |
| 54 | ||
| 55 | for (i = 0; i < oi->keymap_size; i++) { | |
| 56 | ret = gpio_request(oi->keymap[i].gpio, | |
| 57 | "gpio_event_output"); | |
| 58 | if (ret) { | |
| 59 | pr_err("gpio_event_output_func: gpio_request " | |
| 60 | "failed for %d\n", oi->keymap[i].gpio); | |
| 61 | goto err_gpio_request_failed; | |
| 62 | } | |
| 63 | ret = gpio_direction_output(oi->keymap[i].gpio, | |
| 64 | output_level); | |
| 65 | if (ret) { | |
| 66 | pr_err("gpio_event_output_func: " | |
| 67 | "gpio_direction_output failed for %d\n", | |
| 68 | oi->keymap[i].gpio); | |
| 69 | goto err_gpio_direction_output_failed; | |
| 70 | } | |
| 71 | } | |
| 72 | return 0; | |
| 73 | } | |
| 74 | ||
| 75 | ret = 0; | |
| 76 | for (i = oi->keymap_size - 1; i >= 0; i--) { | |
| 77 | err_gpio_direction_output_failed: | |
| 78 | gpio_free(oi->keymap[i].gpio); | |
| 79 | err_gpio_request_failed: | |
| 80 | ; | |
| 81 | } | |
| 82 | return ret; | |
| 83 | } | |
| 84 |