209 lines
4.3 KiB
C
209 lines
4.3 KiB
C
/*
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* Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* Under GPLv2
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*/
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#include <common.h>
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#include <errno.h>
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#include <init.h>
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#include <clock.h>
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#include <gpio_keys.h>
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#include <poller.h>
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#include <gpio.h>
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#include <of_gpio.h>
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#include <input/keyboard.h>
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struct gpio_key {
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int code;
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int gpio;
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int active_low;
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int previous_state;
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};
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struct gpio_keys {
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struct gpio_key *buttons;
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int nbuttons;
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/* optional */
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int fifo_size;
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struct kfifo *recv_fifo;
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struct poller_struct poller;
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struct console_device cdev;
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int use_keycodes;
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};
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static inline struct gpio_keys *
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poller_to_gk_pdata(struct poller_struct *poller)
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{
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return container_of(poller, struct gpio_keys, poller);
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}
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static inline struct gpio_keys *
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cdev_to_gk_pdata(struct console_device *cdev)
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{
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return container_of(cdev, struct gpio_keys, cdev);
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}
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static void gpio_key_poller(struct poller_struct *poller)
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{
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struct gpio_keys *gk = poller_to_gk_pdata(poller);
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struct gpio_key *gb;
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int i, val;
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for (i = 0; i < gk->nbuttons; i++) {
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gb = &gk->buttons[i];
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val = gpio_get_value(gb->gpio);
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if (val != gb->previous_state && val != gb->active_low) {
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kfifo_put(gk->recv_fifo, (u_char*)&gb->code, sizeof(int));
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debug("pressed gpio(%d) as %d\n", gb->gpio, gb->code);
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}
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gb->previous_state = val;
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}
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}
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static int gpio_keys_tstc(struct console_device *cdev)
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{
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struct gpio_keys *gk = cdev_to_gk_pdata(cdev);
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return (kfifo_len(gk->recv_fifo) == 0) ? 0 : 1;
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}
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static int gpio_keys_getc(struct console_device *cdev)
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{
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int code = 0;
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struct gpio_keys *gk = cdev_to_gk_pdata(cdev);
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kfifo_get(gk->recv_fifo, (u_char*)&code, sizeof(int));
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if (IS_ENABLED(CONFIG_OFDEVICE) && gk->use_keycodes)
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return keycode_bb_keys[code];
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else
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return code;
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}
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static int gpio_keys_probe_pdata(struct gpio_keys *gk, struct device_d *dev)
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{
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struct gpio_keys_platform_data *pdata;
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int i;
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pdata = dev->platform_data;
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if (!pdata) {
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/* small (so we copy it) but critical! */
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dev_err(dev, "missing platform_data\n");
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return -ENODEV;
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}
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if (pdata->fifo_size)
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gk->fifo_size = pdata->fifo_size;
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gk->buttons = xzalloc(pdata->nbuttons * sizeof(*gk->buttons));
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gk->nbuttons = pdata->nbuttons;
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for (i = 0; i < gk->nbuttons; i++) {
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gk->buttons[i].gpio = pdata->buttons[i].gpio;
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gk->buttons[i].code = pdata->buttons[i].code;
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gk->buttons[i].active_low = pdata->buttons[i].active_low;
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}
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return 0;
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}
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static int gpio_keys_probe_dt(struct gpio_keys *gk, struct device_d *dev)
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{
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struct device_node *npkey, *np = dev->device_node;
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int i = 0, ret;
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if (!IS_ENABLED(CONFIG_OFDEVICE) || !IS_ENABLED(CONFIG_OF_GPIO))
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return -ENODEV;
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gk->nbuttons = of_get_child_count(np);
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gk->buttons = xzalloc(gk->nbuttons * sizeof(*gk->buttons));
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for_each_child_of_node(np, npkey) {
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enum of_gpio_flags gpioflags;
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uint32_t keycode;
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gk->buttons[i].gpio = of_get_named_gpio_flags(npkey, "gpios", 0, &gpioflags);
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if (gk->buttons[i].gpio < 0)
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return gk->buttons[i].gpio;
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if (gpioflags & OF_GPIO_ACTIVE_LOW)
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gk->buttons[i].active_low = 1;
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ret = of_property_read_u32(npkey, "linux,code", &keycode);
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if (ret)
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return ret;
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gk->buttons[i].code = keycode;
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i++;
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}
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gk->use_keycodes = 1;
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return 0;
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}
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static int __init gpio_keys_probe(struct device_d *dev)
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{
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int ret, i, gpio;
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struct console_device *cdev;
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struct gpio_keys *gk;
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gk = xzalloc(sizeof(*gk));
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gk->fifo_size = 50;
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if (dev->device_node)
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ret = gpio_keys_probe_dt(gk, dev);
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else
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ret = gpio_keys_probe_pdata(gk, dev);
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if (ret)
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return ret;
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gk->recv_fifo = kfifo_alloc(gk->fifo_size);
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for (i = 0; i < gk->nbuttons; i++) {
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gpio = gk->buttons[i].gpio;
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ret = gpio_request(gpio, "gpio_keys");
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if (ret) {
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pr_err("gpio_keys: (%d) can not be requested\n", gpio);
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return ret;
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}
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gpio_direction_input(gpio);
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gk->buttons[i].previous_state = gk->buttons[i].active_low;
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}
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gk->poller.func = gpio_key_poller;
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cdev = &gk->cdev;
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dev->type_data = cdev;
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cdev->dev = dev;
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cdev->tstc = gpio_keys_tstc;
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cdev->getc = gpio_keys_getc;
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console_register(&gk->cdev);
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return poller_register(&gk->poller);
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}
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static struct of_device_id key_gpio_of_ids[] = {
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{ .compatible = "gpio-keys", },
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{ }
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};
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static struct driver_d gpio_keys_driver = {
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.name = "gpio_keys",
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.probe = gpio_keys_probe,
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.of_compatible = DRV_OF_COMPAT(key_gpio_of_ids),
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};
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device_platform_driver(gpio_keys_driver);
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