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Code

generic: update gpio_buttons driver

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23984 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg 2010-11-12 18:53:01 +00:00
parent 4355718b98
commit dc37a9bd6b
1 changed files with 55 additions and 39 deletions
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94
target/linux/generic/files/drivers/input/misc/gpio_buttons.c
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@ -20,23 +20,19 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input-polldev.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/gpio_buttons.h>
#include <asm/gpio.h>
#define DRV_NAME "gpio-buttons"
#define DRV_VERSION "0.1.2"
#define PFX DRV_NAME ": "
struct gpio_button_data {
int last_state;
int count;
int can_sleep;
};
struct gpio_buttons_dev {
@ -45,6 +41,28 @@ struct gpio_buttons_dev {
struct gpio_button_data *data;
};
static void gpio_buttons_check_state(struct input_dev *input,
struct gpio_button *button,
struct gpio_button_data *bdata)
{
int state;
if (bdata->can_sleep)
state = !!gpio_get_value_cansleep(button->gpio);
else
state = !!gpio_get_value(button->gpio);
if (state != bdata->last_state) {
unsigned int type = button->type ?: EV_KEY;
input_event(input, type, button->code,
!!(state ^ button->active_low));
input_sync(input);
bdata->count = 0;
bdata->last_state = state;
}
}
static void gpio_buttons_poll(struct input_polled_dev *dev)
{
struct gpio_buttons_dev *bdev = dev->private;
@ -54,41 +72,34 @@ static void gpio_buttons_poll(struct input_polled_dev *dev)
for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_button *button = &pdata->buttons[i];
unsigned int type = button->type ?: EV_KEY;
int state;
struct gpio_button_data *bdata = &bdev->data[i];
if (bdev->data[i].count < button->threshold) {
bdev->data[i].count++;
continue;
}
if (bdata->count < button->threshold)
bdata->count++;
else
gpio_buttons_check_state(input, button, bdata);
state = gpio_get_value(button->gpio) ? 1 : 0;
if (state != bdev->data[i].last_state) {
input_event(input, type, button->code,
!!(state ^ button->active_low));
input_sync(input);
bdev->data[i].count = 0;
bdev->data[i].last_state = state;
}
}
}
static int __devinit gpio_buttons_probe(struct platform_device *pdev)
{
struct gpio_buttons_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct gpio_buttons_dev *bdev;
struct input_polled_dev *poll_dev;
struct input_dev *input;
int error, i;
int error;
int i;
if (!pdata)
return -ENXIO;
bdev = kzalloc(sizeof(struct gpio_buttons_dev) +
sizeof(struct gpio_button_data) * pdata->nbuttons,
pdata->nbuttons * sizeof(struct gpio_button_data),
GFP_KERNEL);
if (!bdev) {
printk(KERN_ERR DRV_NAME "no memory for device\n");
dev_err(dev, "no memory for private data\n");
return -ENOMEM;
}
@ -96,7 +107,7 @@ static int __devinit gpio_buttons_probe(struct platform_device *pdev)
poll_dev = input_allocate_polled_device();
if (!poll_dev) {
printk(KERN_ERR DRV_NAME "no memory for polled device\n");
dev_err(dev, "no memory for polled device\n");
error = -ENOMEM;
goto err_free_bdev;
}
@ -122,23 +133,26 @@ static int __devinit gpio_buttons_probe(struct platform_device *pdev)
unsigned int gpio = button->gpio;
unsigned int type = button->type ?: EV_KEY;
error = gpio_request(gpio, button->desc ?
button->desc : DRV_NAME);
error = gpio_request(gpio,
button->desc ? button->desc : DRV_NAME);
if (error) {
printk(KERN_ERR PFX "unable to claim gpio %u, "
"error %d\n", gpio, error);
dev_err(dev, "unable to claim gpio %u, err=%d\n",
gpio, error);
goto err_free_gpio;
}
error = gpio_direction_input(gpio);
if (error) {
printk(KERN_ERR PFX "unable to set direction on "
"gpio %u, error %d\n", gpio, error);
dev_err(dev,
"unable to set direction on gpio %u, err=%d\n",
gpio, error);
goto err_free_gpio;
}
bdev->data[i].can_sleep = gpio_cansleep(gpio);
bdev->data[i].last_state = -1;
input_set_capability(input, type, button->code);
bdev->data[i].last_state = gpio_get_value(button->gpio) ? 1 : 0;
}
bdev->poll_dev = poll_dev;
@ -147,11 +161,16 @@ static int __devinit gpio_buttons_probe(struct platform_device *pdev)
error = input_register_polled_device(poll_dev);
if (error) {
printk(KERN_ERR PFX "unable to register polled device, "
"error %d\n", error);
dev_err(dev, "unable to register polled device, err=%d\n",
error);
goto err_free_gpio;
}
/* report initial state of the buttons */
for (i = 0; i < pdata->nbuttons; i++)
gpio_buttons_check_state(input, &pdata->buttons[i],
&bdev->data[i]);
return 0;
err_free_gpio:
@ -197,7 +216,6 @@ static struct platform_driver gpio_buttons_driver = {
static int __init gpio_buttons_init(void)
{
printk(KERN_INFO DRV_NAME " driver version " DRV_VERSION "\n");
return platform_driver_register(&gpio_buttons_driver);
}
@ -209,8 +227,6 @@ static void __exit gpio_buttons_exit(void)
module_init(gpio_buttons_init);
module_exit(gpio_buttons_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("Polled buttons driver for CPU GPIOs");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION("Polled GPIO Buttons driver");