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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/netlink.h>
#include <linux/kobject.h> #include <linux/kobject.h>
#include <linux/input.h> #include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/of_gpio.h> #include <linux/of_gpio.h>
#include <linux/gpio_keys.h> #include <linux/gpio_keys.h>
#define DRV_NAME "gpio-keys-polled" #define DRV_NAME "gpio-keys"
#define BH_SKB_SIZE 2048 #define BH_SKB_SIZE 2048
@ -69,6 +70,7 @@ struct gpio_keys_button_data {
int count; int count;
int threshold; int threshold;
int can_sleep; int can_sleep;
struct gpio_keys_button *b;
}; };
extern u64 uevent_next_seqnum(void); 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) static int button_hotplug_fill_event(struct bh_event *event)
{ {
char *s;
int ret; int ret;
ret = bh_event_add_var(event, 0, "HOME=%s", "/"); 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, 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; struct bh_priv *priv = &data->bh;
unsigned long seen = jiffies; unsigned long seen = jiffies;
int btn; 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)) if ((type != EV_KEY) && (type != EV_SW))
return; return;
btn = button_get_index(code); btn = button_get_index(data->b->code);
if (btn < 0) if (btn < 0)
return; return;
@ -256,12 +257,13 @@ static void button_hotplug_event(struct gpio_keys_button_data *data,
} }
#else #else
static void button_hotplug_event(struct gpio_keys_button_data *data, 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 */ #endif /* CONFIG_HOTPLUG */
struct gpio_keys_polled_dev { struct gpio_keys_button_dev {
int polled;
struct delayed_work work; struct delayed_work work;
struct device *dev; struct device *dev;
@ -269,26 +271,24 @@ struct gpio_keys_polled_dev {
struct gpio_keys_button_data data[0]; struct gpio_keys_button_data data[0];
}; };
static int gpio_button_get_value(struct gpio_keys_button *button, static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
struct gpio_keys_button_data *bdata)
{ {
int val; int val;
if (bdata->can_sleep) if (bdata->can_sleep)
val = !!gpio_get_value_cansleep(button->gpio); val = !!gpio_get_value_cansleep(bdata->b->gpio);
else 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, static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
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) { 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) { if (bdata->count < bdata->threshold) {
bdata->count++; 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)) 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; bdata->last_state = state;
} }
@ -304,55 +304,58 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
bdata->count = 0; 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; struct gpio_keys_platform_data *pdata = bdev->pdata;
unsigned long delay = msecs_to_jiffies(pdata->poll_interval); unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
if (delay >= HZ) if (delay >= HZ)
delay = round_jiffies_relative(delay); delay = round_jiffies_relative(delay);
schedule_delayed_work(&bdev->work, delay); schedule_delayed_work(&bdev->work, delay);
} }
static void gpio_keys_polled_poll(struct work_struct *work) static void gpio_keys_polled_poll(struct work_struct *work)
{ {
struct gpio_keys_polled_dev *bdev = struct gpio_keys_button_dev *bdev =
container_of(work, struct gpio_keys_polled_dev, work.work); container_of(work, struct gpio_keys_button_dev, work.work);
struct gpio_keys_platform_data *pdata = bdev->pdata;
int i; int i;
for (i = 0; i < bdev->pdata->nbuttons; i++) { for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[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); 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; struct gpio_keys_platform_data *pdata = bdev->pdata;
int i;
if (pdata->enable) cancel_delayed_work_sync(&bdev->work);
pdata->enable(bdev->dev);
/* report initial state of the buttons */ if (pdata->disable)
for (i = 0; i < pdata->nbuttons; i++) pdata->disable(bdev->dev);
gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]); }
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 #ifdef CONFIG_OF
static struct gpio_keys_platform_data * 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 device_node *node, *pp;
struct gpio_keys_platform_data *pdata; struct gpio_keys_platform_data *pdata;
struct gpio_keys_button *button; struct gpio_keys_button *button;
int error; int error;
int nbuttons; int nbuttons;
int i; int i = 0;
node = dev->of_node; node = dev->of_node;
if (!node) if (!node)
@ -362,7 +365,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
if (nbuttons == 0) if (nbuttons == 0)
return NULL; return NULL;
pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button), pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * (sizeof *button),
GFP_KERNEL); GFP_KERNEL);
if (!pdata) { if (!pdata) {
error = -ENOMEM; error = -ENOMEM;
@ -375,7 +378,6 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
pdata->rep = !!of_get_property(node, "autorepeat", NULL); pdata->rep = !!of_get_property(node, "autorepeat", NULL);
of_property_read_u32(node, "poll-interval", &pdata->poll_interval); of_property_read_u32(node, "poll-interval", &pdata->poll_interval);
i = 0;
for_each_child_of_node(node, pp) { for_each_child_of_node(node, pp) {
enum of_gpio_flags flags; 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", dev_err(dev, "Button without keycode: 0x%x\n",
button->gpio); button->gpio);
error = -EINVAL; error = -EINVAL;
goto err_free_pdata; goto err_out;
} }
button->desc = of_get_property(pp, "label", NULL); 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) { if (pdata->nbuttons == 0) {
error = -EINVAL; error = -EINVAL;
goto err_free_pdata; goto err_out;
} }
return pdata; return pdata;
err_free_pdata:
kfree(pdata);
err_out: err_out:
return ERR_PTR(error); 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[] = { static struct of_device_id gpio_keys_polled_of_match[] = {
{ .compatible = "gpio-keys-polled", }, { .compatible = "gpio-keys-polled", },
{ }, { },
@ -431,47 +437,47 @@ MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
#else #else
static inline struct gpio_keys_platform_data * 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; return NULL;
} }
#endif #endif
static void gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev) static int gpio_keys_button_probe(struct platform_device *pdev,
{ struct gpio_keys_button_dev **_bdev, int polled)
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)
{ {
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev; 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 error;
int i; int i;
if (!pdata) { if (!pdata) {
pdata = gpio_keys_polled_get_devtree_pdata(dev); pdata = gpio_keys_get_devtree_pdata(dev);
if (IS_ERR(pdata)) if (IS_ERR(pdata))
return PTR_ERR(pdata); return PTR_ERR(pdata);
if (!pdata) { if (!pdata) {
dev_err(dev, "missing platform data\n"); dev_err(dev, "missing platform data\n");
return -EINVAL; return -EINVAL;
} }
pdev->dev.platform_data = pdata;
} }
if (!pdata->poll_interval) { if (polled && !pdata->poll_interval) {
dev_err(dev, "missing poll_interval value\n"); dev_err(dev, "missing poll_interval value\n");
error = -EINVAL; return -EINVAL;
goto err_free_pdata;
} }
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), pdata->nbuttons * sizeof(struct gpio_keys_button_data),
GFP_KERNEL); GFP_KERNEL);
if (!bdev) { if (!bdev) {
@ -479,23 +485,24 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
return -ENOMEM; return -ENOMEM;
} }
bdev->polled = polled;
for (i = 0; i < pdata->nbuttons; i++) { 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]; struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned int gpio = button->gpio; unsigned int gpio = button->gpio;
if (button->wakeup) { if (button->wakeup) {
dev_err(dev, DRV_NAME " does not support wakeup\n"); dev_err(dev, DRV_NAME "does not support wakeup\n");
error = -EINVAL; return -EINVAL;
goto err_free_gpio;
} }
error = gpio_request(gpio, error = devm_gpio_request(dev, gpio,
button->desc ? button->desc : DRV_NAME); button->desc ? button->desc : DRV_NAME);
if (error) { if (error) {
dev_err(dev, "unable to claim gpio %u, err=%d\n", dev_err(dev, "unable to claim gpio %u, err=%d\n",
gpio, error); gpio, error);
goto err_free_gpio; return error;
} }
error = gpio_direction_input(gpio); error = gpio_direction_input(gpio);
@ -503,79 +510,154 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
dev_err(dev, dev_err(dev,
"unable to set direction on gpio %u, err=%d\n", "unable to set direction on gpio %u, err=%d\n",
gpio, error); gpio, error);
goto err_free_gpio; return error;
} }
bdata->can_sleep = gpio_cansleep(gpio); bdata->can_sleep = gpio_cansleep(gpio);
bdata->last_state = -1; 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); pdata->poll_interval);
else
bdata->threshold = 1;
bdata->b = &pdata->buttons[i];
} }
bdev->dev = &pdev->dev; bdev->dev = &pdev->dev;
bdev->pdata = pdata; bdev->pdata = pdata;
platform_set_drvdata(pdev, bdev); platform_set_drvdata(pdev, bdev);
INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll); *_bdev = bdev;
gpio_keys_polled_open(bdev);
return 0; 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); ret = gpio_keys_button_probe(pdev, &bdev, 0);
platform_set_drvdata(pdev, NULL);
err_free_pdata: if (ret)
/* If we have no platform_data, we allocated pdata dynamically. */ return ret;
if (!dev_get_platdata(&pdev->dev))
kfree(pdata);
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;
struct gpio_keys_platform_data *pdata = bdev->pdata; struct gpio_keys_button_dev *bdev;
int i = pdata->nbuttons; 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) if (pdata->enable)
gpio_free(pdata->buttons[i].gpio); 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); 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 = { static struct platform_driver gpio_keys_polled_driver = {
.probe = gpio_keys_polled_probe, .probe = gpio_keys_polled_probe,
.remove = gpio_keys_polled_remove, .remove = gpio_keys_remove,
.driver = { .driver = {
.name = DRV_NAME, .name = "gpio-keys-polled",
.owner = THIS_MODULE, .owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpio_keys_polled_of_match), .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); platform_driver_unregister(&gpio_keys_polled_driver);
} }
module_init(gpio_keys_polled_init); module_init(gpio_button_init);
module_exit(gpio_keys_polled_exit); module_exit(gpio_button_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");

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