/*
|
* Driver for keys on GPIO lines capable of generating interrupts.
|
*
|
* Copyright (C) 2015, Fuzhou Rockchip Electronics Co., Ltd
|
* Copyright 2005 Phil Blundell
|
*
|
* This program is free software; you can redistribute it and/or modify
|
* it under the terms of the GNU General Public License version 2 as
|
* published by the Free Software Foundation.
|
*/
|
|
#include <linux/module.h>
|
#include <linux/init.h>
|
#include <linux/fs.h>
|
#include <linux/interrupt.h>
|
#include <linux/irq.h>
|
#include <linux/sched.h>
|
#include <linux/pm.h>
|
#include <linux/sysctl.h>
|
#include <linux/proc_fs.h>
|
#include <linux/delay.h>
|
#include <linux/platform_device.h>
|
#include <linux/input.h>
|
#include <linux/slab.h>
|
#include <linux/wakelock.h>
|
|
#include <linux/iio/iio.h>
|
#include <linux/iio/machine.h>
|
#include <linux/iio/driver.h>
|
#include <linux/iio/consumer.h>
|
|
#include <linux/gpio.h>
|
#include <linux/of.h>
|
#include <linux/of_irq.h>
|
#include <linux/of_gpio.h>
|
#include <linux/of_platform.h>
|
#include <linux/rk_keys.h>
|
|
#define EMPTY_DEFAULT_ADVALUE 1024
|
#define DRIFT_DEFAULT_ADVALUE 70
|
#define INVALID_ADVALUE -1
|
#define EV_ENCALL KEY_F4
|
#define EV_MENU KEY_F1
|
|
#if 0
|
#define key_dbg(bdata, format, arg...) \
|
dev_info(&bdata->input->dev, format, ##arg)
|
#else
|
#define key_dbg(bdata, format, arg...)
|
#endif
|
|
#define DEBOUNCE_JIFFIES (10 / (MSEC_PER_SEC / HZ)) /* 10ms */
|
#define ADC_SAMPLE_JIFFIES (100 / (MSEC_PER_SEC / HZ)) /* 100ms */
|
#define WAKE_LOCK_JIFFIES (1 * HZ) /* 1s */
|
|
enum rk_key_type {
|
TYPE_GPIO = 1,
|
TYPE_ADC
|
};
|
|
struct rk_keys_button {
|
struct device *dev;
|
u32 type; /* TYPE_GPIO, TYPE_ADC */
|
u32 code; /* key code */
|
const char *desc; /* key label */
|
u32 state; /* key up & down state */
|
int gpio; /* gpio only */
|
int adc_value; /* adc only */
|
int adc_state; /* adc only */
|
int active_low; /* gpio only */
|
int wakeup; /* gpio only */
|
struct timer_list timer;
|
};
|
|
struct rk_keys_drvdata {
|
int nbuttons;
|
/* flag to indicate if we're suspending/resuming */
|
bool in_suspend;
|
int result;
|
int rep;
|
int drift_advalue;
|
struct wake_lock wake_lock;
|
struct input_dev *input;
|
struct delayed_work adc_poll_work;
|
struct iio_channel *chan;
|
struct rk_keys_button button[0];
|
};
|
|
static struct input_dev *sinput_dev;
|
|
void rk_send_power_key(int state)
|
{
|
if (!sinput_dev)
|
return;
|
if (state) {
|
input_report_key(sinput_dev, KEY_POWER, 1);
|
input_sync(sinput_dev);
|
} else {
|
input_report_key(sinput_dev, KEY_POWER, 0);
|
input_sync(sinput_dev);
|
}
|
}
|
EXPORT_SYMBOL(rk_send_power_key);
|
|
void rk_send_wakeup_key(void)
|
{
|
if (!sinput_dev)
|
return;
|
|
input_report_key(sinput_dev, KEY_WAKEUP, 1);
|
input_sync(sinput_dev);
|
input_report_key(sinput_dev, KEY_WAKEUP, 0);
|
input_sync(sinput_dev);
|
}
|
EXPORT_SYMBOL(rk_send_wakeup_key);
|
|
static void keys_timer(unsigned long _data)
|
{
|
struct rk_keys_button *button = (struct rk_keys_button *)_data;
|
struct rk_keys_drvdata *pdata = dev_get_drvdata(button->dev);
|
struct input_dev *input = pdata->input;
|
int state;
|
|
if (button->type == TYPE_GPIO)
|
state = !!((gpio_get_value(button->gpio) ? 1 : 0) ^
|
button->active_low);
|
else
|
state = !!button->adc_state;
|
|
if (button->state != state) {
|
button->state = state;
|
input_event(input, EV_KEY, button->code, button->state);
|
key_dbg(pdata, "%skey[%s]: report event[%d] state[%d]\n",
|
button->type == TYPE_ADC ? "adc" : "gpio",
|
button->desc, button->code, button->state);
|
input_event(input, EV_KEY, button->code, button->state);
|
input_sync(input);
|
}
|
|
if (state)
|
mod_timer(&button->timer, jiffies + DEBOUNCE_JIFFIES);
|
}
|
|
static irqreturn_t keys_isr(int irq, void *dev_id)
|
{
|
struct rk_keys_button *button = (struct rk_keys_button *)dev_id;
|
struct rk_keys_drvdata *pdata = dev_get_drvdata(button->dev);
|
struct input_dev *input = pdata->input;
|
|
BUG_ON(irq != gpio_to_irq(button->gpio));
|
|
if (button->wakeup && pdata->in_suspend) {
|
button->state = 1;
|
key_dbg(pdata,
|
"wakeup: %skey[%s]: report event[%d] state[%d]\n",
|
(button->type == TYPE_ADC) ? "adc" : "gpio",
|
button->desc, button->code, button->state);
|
input_event(input, EV_KEY, button->code, button->state);
|
input_sync(input);
|
}
|
if (button->wakeup)
|
wake_lock_timeout(&pdata->wake_lock, WAKE_LOCK_JIFFIES);
|
mod_timer(&button->timer, jiffies + DEBOUNCE_JIFFIES);
|
|
return IRQ_HANDLED;
|
}
|
|
/*
|
static ssize_t adc_value_show(struct device *dev, struct device_attribute *attr,
|
char *buf)
|
{
|
struct rk_keys_drvdata *ddata = dev_get_drvdata(dev);
|
|
return sprintf(buf, "adc_value: %d\n", ddata->result);
|
}
|
static DEVICE_ATTR(get_adc_value, S_IRUGO | S_IWUSR, adc_value_show, NULL);
|
*/
|
|
static const struct of_device_id rk_key_match[] = {
|
{ .compatible = "rockchip,key", .data = NULL},
|
{},
|
};
|
MODULE_DEVICE_TABLE(of, rk_key_match);
|
|
static int rk_key_adc_iio_read(struct rk_keys_drvdata *data)
|
{
|
struct iio_channel *channel = data->chan;
|
int val, ret;
|
|
if (!channel)
|
return INVALID_ADVALUE;
|
ret = iio_read_channel_raw(channel, &val);
|
if (ret < 0) {
|
pr_err("read channel() error: %d\n", ret);
|
return ret;
|
}
|
return val;
|
}
|
|
static void adc_key_poll(struct work_struct *work)
|
{
|
struct rk_keys_drvdata *ddata;
|
int i, result = -1;
|
|
ddata = container_of(work, struct rk_keys_drvdata, adc_poll_work.work);
|
if (!ddata->in_suspend) {
|
result = rk_key_adc_iio_read(ddata);
|
if (result > INVALID_ADVALUE &&
|
result < (EMPTY_DEFAULT_ADVALUE - ddata->drift_advalue))
|
ddata->result = result;
|
for (i = 0; i < ddata->nbuttons; i++) {
|
struct rk_keys_button *button = &ddata->button[i];
|
|
if (!button->adc_value)
|
continue;
|
if (result < button->adc_value + ddata->drift_advalue &&
|
result > button->adc_value - ddata->drift_advalue)
|
button->adc_state = 1;
|
else
|
button->adc_state = 0;
|
if (button->state != button->adc_state)
|
mod_timer(&button->timer,
|
jiffies + DEBOUNCE_JIFFIES);
|
}
|
}
|
|
schedule_delayed_work(&ddata->adc_poll_work, ADC_SAMPLE_JIFFIES);
|
}
|
|
static int rk_key_type_get(struct device_node *node,
|
struct rk_keys_button *button)
|
{
|
u32 adc_value;
|
|
if (!of_property_read_u32(node, "rockchip,adc_value", &adc_value))
|
return TYPE_ADC;
|
else if (of_get_gpio(node, 0) >= 0)
|
return TYPE_GPIO;
|
else
|
return -1;
|
}
|
|
static int rk_keys_parse_dt(struct rk_keys_drvdata *pdata,
|
struct platform_device *pdev)
|
{
|
struct device_node *node = pdev->dev.of_node;
|
struct device_node *child_node;
|
struct iio_channel *chan;
|
int ret, gpio, i = 0;
|
u32 code, adc_value, flags, drift;
|
|
if (of_property_read_u32(node, "adc-drift", &drift))
|
pdata->drift_advalue = DRIFT_DEFAULT_ADVALUE;
|
else
|
pdata->drift_advalue = (int)drift;
|
|
chan = iio_channel_get(&pdev->dev, NULL);
|
if (IS_ERR(chan)) {
|
dev_info(&pdev->dev, "no io-channels defined\n");
|
chan = NULL;
|
}
|
pdata->chan = chan;
|
|
for_each_child_of_node(node, child_node) {
|
if (of_property_read_u32(child_node, "linux,code", &code)) {
|
dev_err(&pdev->dev,
|
"Missing linux,code property in the DT.\n");
|
ret = -EINVAL;
|
goto error_ret;
|
}
|
pdata->button[i].code = code;
|
pdata->button[i].desc =
|
of_get_property(child_node, "label", NULL);
|
pdata->button[i].type =
|
rk_key_type_get(child_node, &pdata->button[i]);
|
switch (pdata->button[i].type) {
|
case TYPE_GPIO:
|
gpio = of_get_gpio_flags(child_node, 0, &flags);
|
if (gpio < 0) {
|
ret = gpio;
|
if (ret != -EPROBE_DEFER)
|
dev_err(&pdev->dev,
|
"Failed to get gpio flags, error: %d\n",
|
ret);
|
goto error_ret;
|
}
|
|
pdata->button[i].gpio = gpio;
|
pdata->button[i].active_low =
|
flags & OF_GPIO_ACTIVE_LOW;
|
pdata->button[i].wakeup =
|
!!of_get_property(child_node, "gpio-key,wakeup",
|
NULL);
|
break;
|
|
case TYPE_ADC:
|
if (of_property_read_u32
|
(child_node, "rockchip,adc_value", &adc_value)) {
|
dev_err(&pdev->dev,
|
"Missing rockchip,adc_value property in the DT.\n");
|
ret = -EINVAL;
|
goto error_ret;
|
}
|
pdata->button[i].adc_value = adc_value;
|
break;
|
|
default:
|
dev_err(&pdev->dev,
|
"Error rockchip,type property in the DT.\n");
|
ret = -EINVAL;
|
goto error_ret;
|
}
|
i++;
|
}
|
|
return 0;
|
|
error_ret:
|
return ret;
|
}
|
|
static int keys_probe(struct platform_device *pdev)
|
{
|
struct device *dev = &pdev->dev;
|
struct device_node *np = pdev->dev.of_node;
|
struct rk_keys_drvdata *ddata = NULL;
|
struct input_dev *input = NULL;
|
int i, error = 0;
|
int wakeup, key_num = 0;
|
|
key_num = of_get_child_count(np);
|
if (key_num == 0)
|
dev_info(&pdev->dev, "no key defined\n");
|
|
ddata = devm_kzalloc(dev, sizeof(struct rk_keys_drvdata) +
|
key_num * sizeof(struct rk_keys_button),
|
GFP_KERNEL);
|
|
input = devm_input_allocate_device(dev);
|
if (!ddata || !input) {
|
error = -ENOMEM;
|
return error;
|
}
|
platform_set_drvdata(pdev, ddata);
|
dev_set_drvdata(&pdev->dev, ddata);
|
|
input->name = "rk29-keypad"; /* pdev->name; */
|
input->phys = "gpio-keys/input0";
|
input->dev.parent = dev;
|
|
input->id.bustype = BUS_HOST;
|
input->id.vendor = 0x0001;
|
input->id.product = 0x0001;
|
input->id.version = 0x0100;
|
ddata->input = input;
|
|
/* parse info from dt */
|
ddata->nbuttons = key_num;
|
error = rk_keys_parse_dt(ddata, pdev);
|
if (error)
|
goto fail0;
|
|
/* Enable auto repeat feature of Linux input subsystem */
|
if (ddata->rep)
|
__set_bit(EV_REP, input->evbit);
|
|
error = input_register_device(input);
|
if (error) {
|
pr_err("gpio-keys: Unable to register input device, error: %d\n",
|
error);
|
goto fail0;
|
}
|
sinput_dev = input;
|
|
for (i = 0; i < ddata->nbuttons; i++) {
|
struct rk_keys_button *button = &ddata->button[i];
|
|
if (button->code) {
|
setup_timer(&button->timer,
|
keys_timer, (unsigned long)button);
|
}
|
|
if (button->wakeup)
|
wakeup = 1;
|
|
input_set_capability(input, EV_KEY, button->code);
|
}
|
|
wake_lock_init(&ddata->wake_lock, WAKE_LOCK_SUSPEND, input->name);
|
device_init_wakeup(dev, wakeup);
|
|
for (i = 0; i < ddata->nbuttons; i++) {
|
struct rk_keys_button *button = &ddata->button[i];
|
|
button->dev = &pdev->dev;
|
if (button->type == TYPE_GPIO) {
|
int irq;
|
|
error =
|
devm_gpio_request(dev, button->gpio,
|
button->desc ? : "keys");
|
if (error < 0) {
|
pr_err("gpio-keys: failed to request GPIO %d, error %d\n",
|
button->gpio, error);
|
goto fail1;
|
}
|
|
error = gpio_direction_input(button->gpio);
|
if (error < 0) {
|
pr_err("gpio-keys: failed to configure input direction for GPIO %d, error %d\n",
|
button->gpio, error);
|
gpio_free(button->gpio);
|
goto fail1;
|
}
|
|
irq = gpio_to_irq(button->gpio);
|
if (irq < 0) {
|
error = irq;
|
pr_err("gpio-keys: Unable to get irq number for GPIO %d, error %d\n",
|
button->gpio, error);
|
gpio_free(button->gpio);
|
goto fail1;
|
}
|
|
error = devm_request_irq(dev, irq, keys_isr,
|
button->active_low ?
|
IRQF_TRIGGER_FALLING :
|
IRQF_TRIGGER_RISING,
|
button->desc ?
|
button->desc : "keys",
|
button);
|
if (error) {
|
pr_err("gpio-keys: Unable to claim irq %d; error %d\n",
|
irq, error);
|
gpio_free(button->gpio);
|
goto fail1;
|
}
|
}
|
}
|
|
input_set_capability(input, EV_KEY, KEY_WAKEUP);
|
/* adc polling work */
|
if (ddata->chan) {
|
INIT_DELAYED_WORK(&ddata->adc_poll_work, adc_key_poll);
|
schedule_delayed_work(&ddata->adc_poll_work,
|
ADC_SAMPLE_JIFFIES);
|
}
|
|
return error;
|
|
fail1:
|
while (--i >= 0)
|
del_timer_sync(&ddata->button[i].timer);
|
device_init_wakeup(dev, 0);
|
wake_lock_destroy(&ddata->wake_lock);
|
fail0:
|
platform_set_drvdata(pdev, NULL);
|
|
return error;
|
}
|
|
static int keys_remove(struct platform_device *pdev)
|
{
|
struct device *dev = &pdev->dev;
|
struct rk_keys_drvdata *ddata = dev_get_drvdata(dev);
|
struct input_dev *input = ddata->input;
|
int i;
|
|
device_init_wakeup(dev, 0);
|
for (i = 0; i < ddata->nbuttons; i++)
|
del_timer_sync(&ddata->button[i].timer);
|
if (ddata->chan)
|
cancel_delayed_work_sync(&ddata->adc_poll_work);
|
input_unregister_device(input);
|
wake_lock_destroy(&ddata->wake_lock);
|
|
sinput_dev = NULL;
|
|
return 0;
|
}
|
|
#ifdef CONFIG_PM
|
static int keys_suspend(struct device *dev)
|
{
|
struct rk_keys_drvdata *ddata = dev_get_drvdata(dev);
|
int i;
|
|
ddata->in_suspend = true;
|
if (device_may_wakeup(dev)) {
|
for (i = 0; i < ddata->nbuttons; i++) {
|
struct rk_keys_button *button = ddata->button + i;
|
|
if (button->wakeup)
|
enable_irq_wake(gpio_to_irq(button->gpio));
|
}
|
}
|
|
return 0;
|
}
|
|
static int keys_resume(struct device *dev)
|
{
|
struct rk_keys_drvdata *ddata = dev_get_drvdata(dev);
|
int i;
|
|
if (device_may_wakeup(dev)) {
|
for (i = 0; i < ddata->nbuttons; i++) {
|
struct rk_keys_button *button = ddata->button + i;
|
|
if (button->wakeup)
|
disable_irq_wake(gpio_to_irq(button->gpio));
|
}
|
preempt_disable();
|
/* for call resend_irqs, which may call keys_isr */
|
if (local_softirq_pending())
|
do_softirq();
|
preempt_enable_no_resched();
|
}
|
|
ddata->in_suspend = false;
|
|
return 0;
|
}
|
|
static const struct dev_pm_ops keys_pm_ops = {
|
.suspend = keys_suspend,
|
.resume = keys_resume,
|
};
|
#endif
|
|
static struct platform_driver keys_device_driver = {
|
.probe = keys_probe,
|
.remove = keys_remove,
|
.driver = {
|
.name = "rk-keypad",
|
.owner = THIS_MODULE,
|
.of_match_table = rk_key_match,
|
#ifdef CONFIG_PM
|
.pm = &keys_pm_ops,
|
#endif
|
}
|
};
|
|
static int __init rk_keys_driver_init(void)
|
{
|
return platform_driver_register(&keys_device_driver);
|
}
|
|
static void __exit rk_keys_driver_exit(void)
|
{
|
platform_driver_unregister(&keys_device_driver);
|
}
|
|
late_initcall_sync(rk_keys_driver_init);
|
module_exit(rk_keys_driver_exit);
|
