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gpio-button-hotplug: support interrupt properties
Upstream Linux's input gpio-keys driver supports
specifying a external interrupt for a gpio via the
'interrupts' properties as well as having support
for software debounce.
This patch ports these features to OpenWrt's event
version. Only the "pure" interrupt-driven support is
left behind, since this goes a bit against the "gpio"
in the "gpio-keys" and I don't have a real device to
test this with.
This patch also silences the generated warnings showing
up since 4.14 due to the 'constification' of the
struct gpio_keys_button *buttons variable in the
upstream struct gpio_keys_platform_data declaration.
gpio-button-hotplug.c: In function 'gpio_keys_get_devtree_pdata':
gpio-button-hotplug.c:392:10: warning: assignment discards 'const'
qualifier from pointer target type [-Wdiscarded-qualifiers]
button = &pdata->buttons[i++];
^
gpio-button-hotplug.c: In function 'gpio_keys_button_probe':
gpio-button-hotplug.c:537:12: warning: assignment discards 'const'
qualifier from pointer target type [-Wdiscarded-qualifiers]
bdata->b = &pdata->buttons[i];
^
gpio-button-hotplug.c: In function 'gpio_keys_probe':
gpio-button-hotplug.c:563:37: warning: initialization discards 'const'
qualifier from pointer target type [-Wdiscarded-qualifiers]
struct gpio_keys_button *button = &pdata->buttons[i];
^
Acked-by: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter
parent
678ee30ee4
commit
afc056d7dc
@ -26,6 +26,7 @@
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/gpio_keys.h>
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#define DRV_NAME "gpio-keys"
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@ -70,7 +71,10 @@ struct gpio_keys_button_data {
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int count;
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int threshold;
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int can_sleep;
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struct gpio_keys_button *b;
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int irq;
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unsigned int software_debounce;
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struct gpio_desc *gpiod;
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const struct gpio_keys_button *b;
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};
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extern u64 uevent_next_seqnum(void);
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@ -298,7 +302,7 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
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return;
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}
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if ((bdata->last_state != -1) || (type == EV_SW))
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if (bdata->last_state != -1 || type == EV_SW)
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button_hotplug_event(bdata, type, state);
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bdata->last_state = state;
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@ -340,11 +344,29 @@ static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev)
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pdata->disable(bdev->dev);
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}
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static void gpio_keys_irq_work_func(struct work_struct *work)
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{
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struct gpio_keys_button_data *bdata = container_of(work,
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struct gpio_keys_button_data, work.work);
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int state = gpio_button_get_value(bdata);
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if (state != bdata->last_state) {
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unsigned int type = bdata->b->type ?: EV_KEY;
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if (bdata->last_state != -1 || type == EV_SW)
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button_hotplug_event(bdata, type, state);
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bdata->last_state = state;
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}
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}
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static irqreturn_t button_handle_irq(int irq, void *_bdata)
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{
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struct gpio_keys_button_data *bdata = (struct gpio_keys_button_data *) _bdata;
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struct gpio_keys_button_data *bdata =
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(struct gpio_keys_button_data *) _bdata;
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button_hotplug_event(bdata, bdata->b->type ?: EV_KEY, gpio_button_get_value(bdata));
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schedule_delayed_work(&bdata->work,
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msecs_to_jiffies(bdata->software_debounce));
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return IRQ_HANDLED;
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}
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@ -390,7 +412,9 @@ gpio_keys_get_devtree_pdata(struct device *dev)
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continue;
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}
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button = &pdata->buttons[i++];
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button = (struct gpio_keys_button *)(&pdata->buttons[i++]);
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button->irq = irq_of_parse_and_map(pp, 0);
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button->gpio = of_get_gpio_flags(pp, 0, &flags);
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if (button->gpio < 0) {
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@ -517,6 +541,9 @@ static int gpio_keys_button_probe(struct platform_device *pdev,
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gpio, error);
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return error;
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}
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bdata->gpiod = gpio_to_desc(gpio);
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if (!bdata->gpiod)
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return -EINVAL;
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error = gpio_direction_input(gpio);
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if (error) {
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@ -529,12 +556,26 @@ static int gpio_keys_button_probe(struct platform_device *pdev,
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bdata->can_sleep = gpio_cansleep(gpio);
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bdata->last_state = -1;
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if (bdev->polled)
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if (bdev->polled) {
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bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
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pdata->poll_interval);
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else
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pdata->poll_interval);
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} else {
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bdata->threshold = 1;
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if (button->debounce_interval) {
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error = gpiod_set_debounce(bdata->gpiod,
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button->debounce_interval * 1000);
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/*
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* use timer if gpiolib doesn't provide
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* debounce.
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*/
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if (error < 0) {
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bdata->software_debounce =
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button->debounce_interval;
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}
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}
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}
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bdata->b = &pdata->buttons[i];
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}
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@ -561,23 +602,39 @@ static int gpio_keys_probe(struct platform_device *pdev)
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pdata = bdev->pdata;
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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const struct gpio_keys_button *button = &pdata->buttons[i];
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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unsigned long irqflags = IRQF_ONESHOT;
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if (!button->irq)
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button->irq = gpio_to_irq(button->gpio);
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if (button->irq < 0) {
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dev_err(&pdev->dev, "failed to get irq for gpio:%d\n", button->gpio);
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continue;
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if (!button->irq) {
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bdata->irq = gpio_to_irq(button->gpio);
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if (bdata->irq < 0) {
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dev_err(&pdev->dev, "failed to get irq for gpio:%d\n",
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button->gpio);
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continue;
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}
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irqflags |= IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
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} else {
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bdata->irq = button->irq;
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}
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ret = devm_request_threaded_irq(&pdev->dev, button->irq, NULL, button_handle_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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dev_name(&pdev->dev), bdata);
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if (ret < 0)
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dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n", button->irq, button->gpio);
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else
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dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n", button->gpio, button->irq);
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INIT_DELAYED_WORK(&bdata->work, gpio_keys_irq_work_func);
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ret = devm_request_threaded_irq(&pdev->dev,
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bdata->irq, NULL, button_handle_irq,
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irqflags, dev_name(&pdev->dev), bdata);
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if (ret < 0) {
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bdata->irq = 0;
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dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n",
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bdata->irq, button->gpio);
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continue;
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} else {
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dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n",
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button->gpio, bdata->irq);
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}
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if (bdata->b->type == EV_SW)
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button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata));
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@ -613,6 +670,19 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
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return ret;
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}
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static void gpio_keys_irq_close(struct gpio_keys_button_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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size_t i;
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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disable_irq(bdata->irq);
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cancel_delayed_work_sync(&bdata->work);
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}
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}
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static int gpio_keys_remove(struct platform_device *pdev)
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{
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struct gpio_keys_button_dev *bdev = platform_get_drvdata(pdev);
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@ -621,6 +691,8 @@ static int gpio_keys_remove(struct platform_device *pdev)
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if (bdev->polled)
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gpio_keys_polled_close(bdev);
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else
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gpio_keys_irq_close(bdev);
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return 0;
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}
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