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gpio-button-hotplug: add irq mode to driver

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Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 39021
v19.07.3_mercusys_ac12_duma
John Crispin 11 years ago
parent 31a2912cd9
commit bc76dec31f
1 changed files with 176 additions and 94 deletions
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270
package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
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@ -23,11 +23,12 @@
#include <linux/netlink.h>
#include <linux/kobject.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio_keys.h>
#define DRV_NAME "gpio-keys-polled"
#define DRV_NAME "gpio-keys"
#define BH_SKB_SIZE 2048
@ -69,6 +70,7 @@ struct gpio_keys_button_data {
int count;
int threshold;
int can_sleep;
struct gpio_keys_button *b;
};
extern u64 uevent_next_seqnum(void);
@ -129,7 +131,6 @@ static int bh_event_add_var(struct bh_event *event, int argv,
static int button_hotplug_fill_event(struct bh_event *event)
{
char *s;
int ret;
ret = bh_event_add_var(event, 0, "HOME=%s", "/");
@ -235,18 +236,18 @@ static int button_get_index(unsigned int code)
}
static void button_hotplug_event(struct gpio_keys_button_data *data,
unsigned int type, unsigned int code, int value)
unsigned int type, int value)
{
struct bh_priv *priv = &data->bh;
unsigned long seen = jiffies;
int btn;
BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
BH_DBG("event type=%u, code=%u, value=%d\n", type, data->b->code, value);
if ((type != EV_KEY) && (type != EV_SW))
return;
btn = button_get_index(code);
btn = button_get_index(data->b->code);
if (btn < 0)
return;
@ -256,12 +257,13 @@ static void button_hotplug_event(struct gpio_keys_button_data *data,
}
#else
static void button_hotplug_event(struct gpio_keys_button_data *data,
unsigned int type, unsigned int code, int value)
unsigned int type, int value)
{
}
#endif /* CONFIG_HOTPLUG */
struct gpio_keys_polled_dev {
struct gpio_keys_button_dev {
int polled;
struct delayed_work work;
struct device *dev;
@ -269,26 +271,24 @@ struct gpio_keys_polled_dev {
struct gpio_keys_button_data data[0];
};
static int gpio_button_get_value(struct gpio_keys_button *button,
struct gpio_keys_button_data *bdata)
static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
{
int val;
if (bdata->can_sleep)
val = !!gpio_get_value_cansleep(button->gpio);
val = !!gpio_get_value_cansleep(bdata->b->gpio);
else
val = !!gpio_get_value(button->gpio);
val = !!gpio_get_value(bdata->b->gpio);
return val ^ button->active_low;
return val ^ bdata->b->active_low;
}
static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
struct gpio_keys_button_data *bdata)
static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
{
int state = gpio_button_get_value(button, bdata);
int state = gpio_button_get_value(bdata);
if (state != bdata->last_state) {
unsigned int type = button->type ?: EV_KEY;
unsigned int type = bdata->b->type ?: EV_KEY;
if (bdata->count < bdata->threshold) {
bdata->count++;
@ -296,7 +296,7 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
}
if ((bdata->last_state != -1) || (type == EV_SW))
button_hotplug_event(bdata, type, button->code, state);
button_hotplug_event(bdata, type, state);
bdata->last_state = state;
}
@ -304,55 +304,58 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
bdata->count = 0;
}
static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev)
static void gpio_keys_polled_queue_work(struct gpio_keys_button_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
if (delay >= HZ)
delay = round_jiffies_relative(delay);
delay = round_jiffies_relative(delay);
schedule_delayed_work(&bdev->work, delay);
}
static void gpio_keys_polled_poll(struct work_struct *work)
{
struct gpio_keys_polled_dev *bdev =
container_of(work, struct gpio_keys_polled_dev, work.work);
struct gpio_keys_platform_data *pdata = bdev->pdata;
struct gpio_keys_button_dev *bdev =
container_of(work, struct gpio_keys_button_dev, work.work);
int i;
for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[i];
gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
gpio_keys_polled_check_state(bdata);
}
gpio_keys_polled_queue_work(bdev);
}
static void gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev)
static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
int i;
if (pdata->enable)
pdata->enable(bdev->dev);
cancel_delayed_work_sync(&bdev->work);
/* report initial state of the buttons */
for (i = 0; i < pdata->nbuttons; i++)
gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]);
if (pdata->disable)
pdata->disable(bdev->dev);
}
gpio_keys_polled_queue_work(bdev);
static irqreturn_t button_handle_irq(int irq, void *_bdata)
{
struct gpio_keys_button_data *bdata = (struct gpio_keys_button_data *) _bdata;
button_hotplug_event(bdata, bdata->b->type ?: EV_KEY, gpio_button_get_value(bdata));
return IRQ_HANDLED;
}
#ifdef CONFIG_OF
static struct gpio_keys_platform_data *
gpio_keys_polled_get_devtree_pdata(struct device *dev)
gpio_keys_get_devtree_pdata(struct device *dev)
{
struct device_node *node, *pp;
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button *button;
int error;
int nbuttons;
int i;
int i = 0;
node = dev->of_node;
if (!node)
@ -362,7 +365,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
if (nbuttons == 0)
return NULL;
pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * (sizeof *button),
GFP_KERNEL);
if (!pdata) {
error = -ENOMEM;
@ -375,7 +378,6 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
pdata->rep = !!of_get_property(node, "autorepeat", NULL);
of_property_read_u32(node, "poll-interval", &pdata->poll_interval);
i = 0;
for_each_child_of_node(node, pp) {
enum of_gpio_flags flags;
@ -394,7 +396,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
dev_err(dev, "Button without keycode: 0x%x\n",
button->gpio);
error = -EINVAL;
goto err_free_pdata;
goto err_out;
}
button->desc = of_get_property(pp, "label", NULL);
@ -411,17 +413,21 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
if (pdata->nbuttons == 0) {
error = -EINVAL;
goto err_free_pdata;
goto err_out;
}
return pdata;
err_free_pdata:
kfree(pdata);
err_out:
return ERR_PTR(error);
}
static struct of_device_id gpio_keys_of_match[] = {
{ .compatible = "gpio-keys", },
{ },
};
MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
static struct of_device_id gpio_keys_polled_of_match[] = {
{ .compatible = "gpio-keys-polled", },
{ },
@ -431,47 +437,47 @@ MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
#else
static inline struct gpio_keys_platform_data *
gpio_keys_polled_get_devtree_pdata(struct device *dev)
gpio_keys_get_devtree_pdata(struct device *dev)
{
return NULL;
}
#endif
static void gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
cancel_delayed_work_sync(&bdev->work);
if (pdata->disable)
pdata->disable(bdev->dev);
}
static int gpio_keys_polled_probe(struct platform_device *pdev)
static int gpio_keys_button_probe(struct platform_device *pdev,
struct gpio_keys_button_dev **_bdev, int polled)
{
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct gpio_keys_polled_dev *bdev;
struct gpio_keys_button_dev *bdev;
struct gpio_keys_button *buttons;
int error;
int i;
if (!pdata) {
pdata = gpio_keys_polled_get_devtree_pdata(dev);
pdata = gpio_keys_get_devtree_pdata(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
if (!pdata) {
dev_err(dev, "missing platform data\n");
return -EINVAL;
}
pdev->dev.platform_data = pdata;
}
if (!pdata->poll_interval) {
if (polled && !pdata->poll_interval) {
dev_err(dev, "missing poll_interval value\n");
error = -EINVAL;
goto err_free_pdata;
return -EINVAL;
}
bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
buttons = devm_kzalloc(dev, pdata->nbuttons * sizeof(struct gpio_keys_button),
GFP_KERNEL);
if (!buttons) {
dev_err(dev, "no memory for button data\n");
return -ENOMEM;
}
memcpy(buttons, pdata->buttons, pdata->nbuttons * sizeof(struct gpio_keys_button));
bdev = devm_kzalloc(dev, sizeof(struct gpio_keys_button_dev) +
pdata->nbuttons * sizeof(struct gpio_keys_button_data),
GFP_KERNEL);
if (!bdev) {
@ -479,23 +485,24 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
return -ENOMEM;
}
bdev->polled = polled;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
struct gpio_keys_button *button = &buttons[i];
struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned int gpio = button->gpio;
if (button->wakeup) {
dev_err(dev, DRV_NAME " does not support wakeup\n");
error = -EINVAL;
goto err_free_gpio;
dev_err(dev, DRV_NAME "does not support wakeup\n");
return -EINVAL;
}
error = gpio_request(gpio,
error = devm_gpio_request(dev, gpio,
button->desc ? button->desc : DRV_NAME);
if (error) {
dev_err(dev, "unable to claim gpio %u, err=%d\n",
gpio, error);
goto err_free_gpio;
return error;
}
error = gpio_direction_input(gpio);
@ -503,79 +510,154 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
dev_err(dev,
"unable to set direction on gpio %u, err=%d\n",
gpio, error);
goto err_free_gpio;
return error;
}
bdata->can_sleep = gpio_cansleep(gpio);
bdata->last_state = -1;
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
if (bdev->polled)
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
pdata->poll_interval);
else
bdata->threshold = 1;
bdata->b = &pdata->buttons[i];
}
bdev->dev = &pdev->dev;
bdev->pdata = pdata;
platform_set_drvdata(pdev, bdev);
INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
gpio_keys_polled_open(bdev);
*_bdev = bdev;
return 0;
}
static int gpio_keys_probe(struct platform_device *pdev)
{
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button_dev *bdev;
int ret, i;
err_free_gpio:
while (--i >= 0)
gpio_free(pdata->buttons[i].gpio);
kfree(bdev);
platform_set_drvdata(pdev, NULL);
ret = gpio_keys_button_probe(pdev, &bdev, 0);
err_free_pdata:
/* If we have no platform_data, we allocated pdata dynamically. */
if (!dev_get_platdata(&pdev->dev))
kfree(pdata);
if (ret)
return ret;
return error;
pdata = pdev->dev.platform_data;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
struct gpio_keys_button_data *bdata = &bdev->data[i];
if (bdata->can_sleep) {
dev_err(&pdev->dev, "skipping gpio:%d, it can sleep\n", button->gpio);
continue;
}
if (!button->irq)
button->irq = gpio_to_irq(button->gpio);
if (button->irq < 0) {
dev_err(&pdev->dev, "failed to get irq for gpio:%d\n", button->gpio);
continue;
}
ret = devm_request_irq(&pdev->dev, button->irq, button_handle_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
dev_name(&pdev->dev), bdata);
if (ret)
dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n", button->irq, button->gpio);
else
dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n", button->gpio, button->irq);
if (bdata->b->type == EV_SW)
button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata));
}
return 0;
}
static int gpio_keys_polled_remove(struct platform_device *pdev)
static int gpio_keys_polled_probe(struct platform_device *pdev)
{
struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
struct gpio_keys_platform_data *pdata = bdev->pdata;
int i = pdata->nbuttons;
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button_dev *bdev;
int ret;
int i;
ret = gpio_keys_button_probe(pdev, &bdev, 1);
if (ret)
return ret;
INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
gpio_keys_polled_close(bdev);
pdata = bdev->pdata;
while (--i >= 0)
gpio_free(pdata->buttons[i].gpio);
if (pdata->enable)
pdata->enable(bdev->dev);
for (i = 0; i < pdata->nbuttons; i++)
gpio_keys_polled_check_state(&bdev->data[i]);
gpio_keys_polled_queue_work(bdev);
return ret;
}
static int gpio_keys_remove(struct platform_device *pdev)
{
struct gpio_keys_button_dev *bdev = platform_get_drvdata(pdev);
kfree(bdev);
platform_set_drvdata(pdev, NULL);
return 0;
if (bdev->polled)
gpio_keys_polled_close(bdev);
return gpio_keys_remove(pdev);
}
static struct platform_driver gpio_keys_driver = {
.probe = gpio_keys_probe,
.remove = gpio_keys_remove,
.driver = {
.name = "gpio-keys",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpio_keys_of_match),
},
};
static struct platform_driver gpio_keys_polled_driver = {
.probe = gpio_keys_polled_probe,
.remove = gpio_keys_polled_remove,
.remove = gpio_keys_remove,
.driver = {
.name = DRV_NAME,
.name = "gpio-keys-polled",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpio_keys_polled_of_match),
},
};
static int __init gpio_keys_polled_init(void)
static int __init gpio_button_init(void)
{
return platform_driver_register(&gpio_keys_polled_driver);
int ret;
ret = platform_driver_register(&gpio_keys_driver);
if (ret)
return ret;
ret = platform_driver_register(&gpio_keys_polled_driver);
if (ret)
platform_driver_unregister(&gpio_keys_driver);
return ret;
}
static void __exit gpio_keys_polled_exit(void)
static void __exit gpio_button_exit(void)
{
platform_driver_unregister(&gpio_keys_driver);
platform_driver_unregister(&gpio_keys_polled_driver);
}
module_init(gpio_keys_polled_init);
module_exit(gpio_keys_polled_exit);
module_init(gpio_button_init);
module_exit(gpio_button_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");

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