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rk29_keys.c
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rk29_keys.c
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/*
* Driver for keys on GPIO lines capable of generating interrupts.
*
* 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/adc.h>
#include <asm/gpio.h>
#include <mach/board.h>
#include <plat/key.h>
#define EMPTY_ADVALUE 950
#define DRIFT_ADVALUE 70
#define INVALID_ADVALUE -1
#define EV_MENU KEY_F1
#if 0
#define key_dbg(bdata, format, arg...) \
dev_printk(KERN_INFO , &bdata->input->dev , format , ## arg)
#else
#define key_dbg(bdata, format, arg...)
#endif
struct rk29_button_data {
int state;
int long_press_count;
struct rk29_keys_button *button;
struct input_dev *input;
struct timer_list timer;
struct rk29_keys_drvdata *ddata;
};
struct rk29_keys_drvdata {
int nbuttons;
int result;
bool in_suspend; /* Flag to indicate if we're suspending/resuming */
struct input_dev *input;
struct adc_client *client;
struct timer_list timer;
struct rk29_button_data data[0];
};
static struct input_dev *input_dev;
struct rk29_keys_Arrary {
char keyArrary[20];
};
static ssize_t rk29key_set(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct rk29_keys_platform_data *pdata = dev_get_platdata(dev);
int i,j,start,end;
char rk29keyArrary[400];
struct rk29_keys_Arrary Arrary[]={
{
.keyArrary = {"menu"},
},
{
.keyArrary = {"home"},
},
{
.keyArrary = {"esc"},
},
{
.keyArrary = {"sensor"},
},
{
.keyArrary = {"play"},
},
{
.keyArrary = {"vol+"},
},
{
.keyArrary = {"vol-"},
},
};
char *p;
for(i=0;i<7;i++)
{
p = strstr(buf,Arrary[i].keyArrary);
if(p==0)
{
dev_dbg(dev," rk29key_set p == 0 error ...............\n");
continue;
}
start = strcspn(p,":");
if(i<6)
end = strcspn(p,",");
else
end = strcspn(p,"}");
memset(rk29keyArrary,0,sizeof(rk29keyArrary));
strncpy(rk29keyArrary,p+start+1,end-start-1);
for(j=0;j<7;j++)
{
if(strcmp(pdata->buttons[j].desc,Arrary[i].keyArrary)==0)
{
if(strcmp(rk29keyArrary,"MENU")==0)
pdata->buttons[j].code = EV_MENU;
else if(strcmp(rk29keyArrary,"HOME")==0)
pdata->buttons[j].code = KEY_HOME;
else if(strcmp(rk29keyArrary,"ESC")==0)
pdata->buttons[j].code = KEY_BACK;
else if(strcmp(rk29keyArrary,"sensor")==0)
pdata->buttons[j].code = KEY_CAMERA;
else if(strcmp(rk29keyArrary,"PLAY")==0)
pdata->buttons[j].code = KEY_POWER;
else if(strcmp(rk29keyArrary,"VOLUP")==0)
pdata->buttons[j].code = KEY_VOLUMEUP;
else if(strcmp(rk29keyArrary,"VOLDOWN")==0)
pdata->buttons[j].code = KEY_VOLUMEDOWN;
else
continue;
}
}
}
for(i=0;i<7;i++)
dev_dbg(dev, "desc=%s, code=%d\n",pdata->buttons[i].desc,pdata->buttons[i].code);
return 0;
}
static DEVICE_ATTR(rk29key,0660, NULL, rk29key_set);
void rk29_send_power_key(int state)
{
if (!input_dev)
return;
if(state)
{
input_report_key(input_dev, KEY_POWER, 1);
input_sync(input_dev);
}
else
{
input_report_key(input_dev, KEY_POWER, 0);
input_sync(input_dev);
}
}
void rk28_send_wakeup_key(void)
{
if (!input_dev)
return;
input_report_key(input_dev, KEY_WAKEUP, 1);
input_sync(input_dev);
input_report_key(input_dev, KEY_WAKEUP, 0);
input_sync(input_dev);
}
static void keys_long_press_timer(unsigned long _data)
{
int state;
struct rk29_button_data *bdata = (struct rk29_button_data *)_data;
struct rk29_keys_button *button = bdata->button;
struct input_dev *input = bdata->input;
unsigned int type = EV_KEY;
if(button->gpio != INVALID_GPIO )
state = !!((gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low);
else
state = !!button->adc_state;
if(state) {
if(bdata->long_press_count != 0) {
if(bdata->long_press_count % (LONG_PRESS_COUNT+ONE_SEC_COUNT) == 0){
key_dbg(bdata, "%skey[%s]: report ev[%d] state[0]\n",
(button->gpio == INVALID_GPIO)?"ad":"io", button->desc, button->code_long_press);
input_event(input, type, button->code_long_press, 0);
input_sync(input);
}
else if(bdata->long_press_count%LONG_PRESS_COUNT == 0) {
key_dbg(bdata, "%skey[%s]: report ev[%d] state[1]\n",
(button->gpio == INVALID_GPIO)?"ad":"io", button->desc, button->code_long_press);
input_event(input, type, button->code_long_press, 1);
input_sync(input);
}
}
bdata->long_press_count++;
mod_timer(&bdata->timer,
jiffies + msecs_to_jiffies(DEFAULT_DEBOUNCE_INTERVAL));
}
else {
if(bdata->long_press_count <= LONG_PRESS_COUNT) {
bdata->long_press_count = 0;
key_dbg(bdata, "%skey[%s]: report ev[%d] state[1], report ev[%d] state[0]\n",
(button->gpio == INVALID_GPIO)?"ad":"io", button->desc, button->code, button->code);
input_event(input, type, button->code, 1);
input_sync(input);
input_event(input, type, button->code, 0);
input_sync(input);
}
else if(bdata->state != state) {
key_dbg(bdata, "%skey[%s]: report ev[%d] state[0]\n",
(button->gpio == INVALID_GPIO)?"ad":"io", button->desc, button->code_long_press);
input_event(input, type, button->code_long_press, 0);
input_sync(input);
}
}
bdata->state = state;
}
static void keys_timer(unsigned long _data)
{
int state;
struct rk29_button_data *bdata = (struct rk29_button_data *)_data;
struct rk29_keys_button *button = bdata->button;
struct input_dev *input = bdata->input;
unsigned int type = EV_KEY;
if(button->gpio != INVALID_GPIO)
state = !!((gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low);
else
state = !!button->adc_state;
if(bdata->state != state) {
bdata->state = state;
key_dbg(bdata, "%skey[%s]: report ev[%d] state[%d]\n",
(button->gpio == INVALID_GPIO)?"ad":"io", button->desc, button->code, bdata->state);
input_event(input, type, button->code, bdata->state);
input_sync(input);
}
if(state)
mod_timer(&bdata->timer,
jiffies + msecs_to_jiffies(DEFAULT_DEBOUNCE_INTERVAL));
}
static irqreturn_t keys_isr(int irq, void *dev_id)
{
struct rk29_button_data *bdata = dev_id;
struct rk29_keys_button *button = bdata->button;
struct input_dev *input = bdata->input;
unsigned int type = EV_KEY;
BUG_ON(irq != gpio_to_irq(button->gpio));
if(button->wakeup == 1 && bdata->ddata->in_suspend == true){
bdata->state = 1;
key_dbg(bdata, "wakeup: %skey[%s]: report ev[%d] state[%d]\n",
(button->gpio == INVALID_GPIO)?"ad":"io", button->desc, button->code, bdata->state);
input_event(input, type, button->code, bdata->state);
input_sync(input);
}
bdata->long_press_count = 0;
mod_timer(&bdata->timer,
jiffies + msecs_to_jiffies(DEFAULT_DEBOUNCE_INTERVAL));
return IRQ_HANDLED;
}
static void keys_adc_callback(struct adc_client *client, void *client_param, int result)
{
struct rk29_keys_drvdata *ddata = (struct rk29_keys_drvdata *)client_param;
int i;
if(result > INVALID_ADVALUE && result < EMPTY_ADVALUE)
ddata->result = result;
for (i = 0; i < ddata->nbuttons; i++) {
struct rk29_button_data *bdata = &ddata->data[i];
struct rk29_keys_button *button = bdata->button;
if(!button->adc_value)
continue;
if(result < button->adc_value + DRIFT_ADVALUE &&
result > button->adc_value - DRIFT_ADVALUE)
button->adc_state = 1;
else
button->adc_state = 0;
if(bdata->state != button->adc_state)
mod_timer(&bdata->timer,
jiffies + msecs_to_jiffies(DEFAULT_DEBOUNCE_INTERVAL));
}
return;
}
static void keys_adc_timer(unsigned long _data)
{
struct rk29_keys_drvdata *ddata = (struct rk29_keys_drvdata *)_data;
if (!ddata->in_suspend)
adc_async_read(ddata->client);
mod_timer(&ddata->timer, jiffies + msecs_to_jiffies(ADC_SAMPLE_TIME));
}
static ssize_t adc_value_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct rk29_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 int __devinit keys_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rk29_keys_platform_data *pdata = dev_get_platdata(dev);
struct rk29_keys_drvdata *ddata;
struct input_dev *input;
int i, error = 0;
int wakeup = 0;
if(!pdata)
return -EINVAL;
ddata = kzalloc(sizeof(struct rk29_keys_drvdata) +
pdata->nbuttons * sizeof(struct rk29_button_data),
GFP_KERNEL);
input = input_allocate_device();
if (!ddata || !input) {
error = -ENOMEM;
goto fail0;
}
platform_set_drvdata(pdev, ddata);
input->name = 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;
/* Enable auto repeat feature of Linux input subsystem */
if (pdata->rep)
__set_bit(EV_REP, input->evbit);
ddata->nbuttons = pdata->nbuttons;
ddata->input = input;
for (i = 0; i < pdata->nbuttons; i++) {
struct rk29_keys_button *button = &pdata->buttons[i];
struct rk29_button_data *bdata = &ddata->data[i];
bdata->input = input;
bdata->button = button;
bdata->ddata = ddata;
if (button->code_long_press)
setup_timer(&bdata->timer,
keys_long_press_timer, (unsigned long)bdata);
else if (button->code)
setup_timer(&bdata->timer,
keys_timer, (unsigned long)bdata);
if (button->wakeup)
wakeup = 1;
input_set_capability(input, EV_KEY, button->code);
};
if (pdata->chn >= 0) {
setup_timer(&ddata->timer, keys_adc_timer, (unsigned long)ddata);
ddata->client = adc_register(pdata->chn, keys_adc_callback, (void *)ddata);
if (!ddata->client) {
error = -EINVAL;
goto fail1;
}
mod_timer(&ddata->timer, jiffies + msecs_to_jiffies(100));
}
for (i = 0; i < pdata->nbuttons; i++) {
struct rk29_keys_button *button = &pdata->buttons[i];
struct rk29_button_data *bdata = &ddata->data[i];
int irq;
if(button->gpio != INVALID_GPIO) {
error = gpio_request(button->gpio, button->desc ?: "keys");
if (error < 0) {
pr_err("gpio-keys: failed to request GPIO %d,"
" error %d\n", button->gpio, error);
goto fail2;
}
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 fail2;
}
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 fail2;
}
error = request_irq(irq, keys_isr,
(button->active_low)?IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING,
button->desc ? button->desc : "keys",
bdata);
if (error) {
pr_err("gpio-keys: Unable to claim irq %d; error %d\n",
irq, error);
gpio_free(button->gpio);
goto fail2;
}
}
}
input_set_capability(input, EV_KEY, KEY_WAKEUP);
error = input_register_device(input);
if (error) {
pr_err("gpio-keys: Unable to register input device, "
"error: %d\n", error);
goto fail2;
}
device_init_wakeup(dev, wakeup);
error = device_create_file(dev, &dev_attr_get_adc_value);
error = device_create_file(dev, &dev_attr_rk29key);
if(error )
{
pr_err("failed to create key file error: %d\n", error);
}
input_dev = input;
return error;
fail2:
while (--i >= 0) {
free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
del_timer_sync(&ddata->data[i].timer);
gpio_free(pdata->buttons[i].gpio);
}
if(pdata->chn >= 0 && ddata->client);
adc_unregister(ddata->client);
if(pdata->chn >= 0)
del_timer_sync(&ddata->timer);
fail1:
platform_set_drvdata(pdev, NULL);
fail0:
input_free_device(input);
kfree(ddata);
return error;
}
static int __devexit keys_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rk29_keys_platform_data *pdata = dev_get_platdata(dev);
struct rk29_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
int i;
input_dev = NULL;
device_init_wakeup(dev, 0);
for (i = 0; i < pdata->nbuttons; i++) {
int irq = gpio_to_irq(pdata->buttons[i].gpio);
free_irq(irq, &ddata->data[i]);
del_timer_sync(&ddata->data[i].timer);
gpio_free(pdata->buttons[i].gpio);
}
if(pdata->chn >= 0 && ddata->client);
adc_unregister(ddata->client);
input_unregister_device(input);
return 0;
}
#ifdef CONFIG_PM
static int keys_suspend(struct device *dev)
{
struct rk29_keys_platform_data *pdata = dev_get_platdata(dev);
struct rk29_keys_drvdata *ddata = dev_get_drvdata(dev);
int i;
ddata->in_suspend = true;
if (device_may_wakeup(dev)) {
for (i = 0; i < pdata->nbuttons; i++) {
struct rk29_keys_button *button = &pdata->buttons[i];
if (button->wakeup) {
int irq = gpio_to_irq(button->gpio);
enable_irq_wake(irq);
}
}
}
return 0;
}
static int keys_resume(struct device *dev)
{
struct rk29_keys_platform_data *pdata = dev_get_platdata(dev);
struct rk29_keys_drvdata *ddata = dev_get_drvdata(dev);
int i;
if (device_may_wakeup(dev)) {
for (i = 0; i < pdata->nbuttons; i++) {
struct rk29_keys_button *button = &pdata->buttons[i];
if (button->wakeup) {
int irq = gpio_to_irq(button->gpio);
disable_irq_wake(irq);
}
}
preempt_disable();
if (local_softirq_pending())
do_softirq(); // for call resend_irqs, which may call keys_isr
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 = __devexit_p(keys_remove),
.driver = {
.name = "rk29-keypad",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &keys_pm_ops,
#endif
}
};
static int __init keys_init(void)
{
return platform_driver_register(&keys_device_driver);
}
static void __exit keys_exit(void)
{
platform_driver_unregister(&keys_device_driver);
}
module_init(keys_init);
module_exit(keys_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");
MODULE_ALIAS("platform:gpio-keys");