102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
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/* drivers/input/misc/gpio_output.c
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*
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* Copyright (C) 2007 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/gpio_event.h>
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int gpio_event_output_event(
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struct gpio_event_input_devs *input_devs, struct gpio_event_info *info,
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void **data, unsigned int dev, unsigned int type,
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unsigned int code, int value)
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{
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int i;
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struct gpio_event_output_info *oi;
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oi = container_of(info, struct gpio_event_output_info, info);
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if (type != oi->type)
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return 0;
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if (!(oi->flags & GPIOEDF_ACTIVE_HIGH))
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value = !value;
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for (i = 0; i < oi->keymap_size; i++)
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if (dev == oi->keymap[i].dev && code == oi->keymap[i].code)
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gpio_set_value(oi->keymap[i].gpio, value);
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return 0;
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}
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int gpio_event_output_func(
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struct gpio_event_input_devs *input_devs, struct gpio_event_info *info,
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void **data, int func)
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{
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int ret;
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int i;
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struct gpio_event_output_info *oi;
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oi = container_of(info, struct gpio_event_output_info, info);
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if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME)
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return 0;
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if (func == GPIO_EVENT_FUNC_INIT) {
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int output_level = !(oi->flags & GPIOEDF_ACTIVE_HIGH);
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for (i = 0; i < oi->keymap_size; i++) {
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int dev = oi->keymap[i].dev;
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if (dev >= input_devs->count) {
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pr_err("gpio_event_output_func: bad device "
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"index %d >= %d for key code %d\n",
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dev, input_devs->count,
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oi->keymap[i].code);
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ret = -EINVAL;
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goto err_bad_keymap;
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}
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input_set_capability(input_devs->dev[dev], oi->type,
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oi->keymap[i].code);
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}
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for (i = 0; i < oi->keymap_size; i++) {
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ret = gpio_request(oi->keymap[i].gpio,
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"gpio_event_output");
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if (ret) {
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pr_err("gpio_event_output_func: gpio_request "
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"failed for %d\n", oi->keymap[i].gpio);
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goto err_gpio_request_failed;
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}
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ret = gpio_direction_output(oi->keymap[i].gpio,
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output_level);
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if (ret) {
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pr_err("gpio_event_output_func: "
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"gpio_direction_output failed for %d\n",
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oi->keymap[i].gpio);
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goto err_gpio_direction_output_failed;
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}
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}
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return 0;
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}
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ret = 0;
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for (i = oi->keymap_size - 1; i >= 0; i--) {
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err_gpio_direction_output_failed:
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gpio_free(oi->keymap[i].gpio);
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err_gpio_request_failed:
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;
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}
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err_bad_keymap:
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return ret;
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}
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MODULE_DESCRIPTION("GPIO output driver");
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MODULE_AUTHOR("Google, Inc");
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MODULE_LICENSE("GPL v2");
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