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-rw-r--r--package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c141
1 files changed, 76 insertions, 65 deletions
diff --git a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
index e63d414284..edd03d2b62 100644
--- a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
+++ b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
@@ -35,10 +35,6 @@
#define DRV_NAME "gpio-keys"
#define PFX DRV_NAME ": "
-struct bh_priv {
- unsigned long seen;
-};
-
struct bh_event {
const char *name;
unsigned int type;
@@ -56,7 +52,8 @@ struct bh_map {
struct gpio_keys_button_data {
struct delayed_work work;
- struct bh_priv bh;
+ unsigned long seen;
+ int map_entry;
int last_state;
int count;
int threshold;
@@ -238,39 +235,6 @@ static int button_get_index(unsigned int code)
return -1;
}
-static void button_hotplug_event(struct gpio_keys_button_data *data,
- unsigned int type, int value)
-{
- struct bh_priv *priv = &data->bh;
- unsigned long seen = jiffies;
- int btn;
-
- pr_debug(PFX "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(data->b->code);
- if (btn < 0)
- return;
-
- if (priv->seen == 0)
- priv->seen = seen;
-
- button_hotplug_create_event(button_map[btn].name, type,
- (seen - priv->seen) / HZ, value);
- priv->seen = seen;
-}
-
-struct gpio_keys_button_dev {
- int polled;
- struct delayed_work work;
-
- struct device *dev;
- struct gpio_keys_platform_data *pdata;
- struct gpio_keys_button_data data[0];
-};
-
static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
{
int val;
@@ -283,27 +247,61 @@ static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
return val ^ bdata->b->active_low;
}
-static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
+static void gpio_keys_handle_button(struct gpio_keys_button_data *bdata)
{
+ unsigned int type = bdata->b->type ?: EV_KEY;
int state = gpio_button_get_value(bdata);
+ unsigned long seen = jiffies;
- if (state != bdata->last_state) {
- unsigned int type = bdata->b->type ?: EV_KEY;
+ pr_debug(PFX "event type=%u, code=%u, pressed=%d\n",
+ type, bdata->b->code, state);
+
+ /* is this the initialization state? */
+ if (bdata->last_state == -1) {
+ /*
+ * Don't advertise unpressed buttons on initialization.
+ * Just save their state and continue otherwise this
+ * can cause OpenWrt to enter failsafe.
+ */
+ if (type == EV_KEY && state == 0)
+ goto set_state;
+ /*
+ * But we are very interested in pressed buttons and
+ * initial switch state. These will be reported to
+ * userland.
+ */
+ } else if (bdata->last_state == state) {
+ /* reset asserted counter (only relevant for polled keys) */
+ bdata->count = 0;
+ return;
+ }
- if (bdata->count < bdata->threshold) {
- bdata->count++;
- return;
- }
+ if (bdata->count < bdata->threshold) {
+ bdata->count++;
+ return;
+ }
- if (bdata->last_state != -1 || type == EV_SW)
- button_hotplug_event(bdata, type, state);
+ if (bdata->seen == 0)
+ bdata->seen = seen;
- bdata->last_state = state;
- }
+ button_hotplug_create_event(button_map[bdata->map_entry].name, type,
+ (seen - bdata->seen) / HZ, state);
+ bdata->seen = seen;
+set_state:
+ bdata->last_state = state;
bdata->count = 0;
}
+struct gpio_keys_button_dev {
+ int polled;
+ struct delayed_work work;
+
+ struct device *dev;
+ struct gpio_keys_platform_data *pdata;
+ struct gpio_keys_button_data data[0];
+};
+
static void gpio_keys_polled_queue_work(struct gpio_keys_button_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
@@ -322,7 +320,9 @@ static void gpio_keys_polled_poll(struct work_struct *work)
for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[i];
- gpio_keys_polled_check_state(bdata);
+
+ if (bdata->gpiod)
+ gpio_keys_handle_button(bdata);
}
gpio_keys_polled_queue_work(bdev);
}
@@ -342,8 +342,7 @@ static void gpio_keys_irq_work_func(struct work_struct *work)
struct gpio_keys_button_data *bdata = container_of(work,
struct gpio_keys_button_data, work.work);
- button_hotplug_event(bdata, bdata->b->type ?: EV_KEY,
- gpio_button_get_value(bdata));
+ gpio_keys_handle_button(bdata);
}
static irqreturn_t button_handle_irq(int irq, void *_bdata)
@@ -351,8 +350,8 @@ static irqreturn_t button_handle_irq(int irq, void *_bdata)
struct gpio_keys_button_data *bdata =
(struct gpio_keys_button_data *) _bdata;
- schedule_delayed_work(&bdata->work,
- msecs_to_jiffies(bdata->software_debounce));
+ mod_delayed_work(system_wq, &bdata->work,
+ msecs_to_jiffies(bdata->software_debounce));
return IRQ_HANDLED;
}
@@ -413,7 +412,7 @@ gpio_keys_get_devtree_pdata(struct device *dev)
return ERR_PTR(error);
}
} else {
- button->active_low = flags & OF_GPIO_ACTIVE_LOW;
+ button->active_low = !!(flags & OF_GPIO_ACTIVE_LOW);
}
if (of_property_read_u32(pp, "linux,code", &button->code)) {
@@ -520,6 +519,19 @@ static int gpio_keys_button_probe(struct platform_device *pdev,
return -EINVAL;
}
+ bdata->map_entry = button_get_index(button->code);
+ if (bdata->map_entry < 0) {
+ dev_warn(dev, DRV_NAME "does not support key code:%u\n",
+ button->code);
+ continue;
+ }
+
+ if (!(button->type == 0 || button->type == EV_KEY ||
+ button->type == EV_SW)) {
+ dev_warn(dev, DRV_NAME "only supports buttons or switches\n");
+ continue;
+ }
+
error = devm_gpio_request(dev, gpio,
button->desc ? button->desc : DRV_NAME);
if (error) {
@@ -540,13 +552,13 @@ static int gpio_keys_button_probe(struct platform_device *pdev,
}
bdata->can_sleep = gpio_cansleep(gpio);
- bdata->last_state = -1;
+ bdata->last_state = -1; /* Unknown state on boot */
if (bdev->polled) {
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
pdata->poll_interval);
} else {
- bdata->threshold = 1;
+ /* bdata->threshold = 0; already initialized */
if (button->debounce_interval) {
error = gpiod_set_debounce(bdata->gpiod,
@@ -592,6 +604,11 @@ static int gpio_keys_probe(struct platform_device *pdev)
struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned long irqflags = IRQF_ONESHOT;
+ INIT_DELAYED_WORK(&bdata->work, gpio_keys_irq_work_func);
+
+ if (!bdata->gpiod)
+ continue;
+
if (!button->irq) {
bdata->irq = gpio_to_irq(button->gpio);
@@ -606,7 +623,8 @@ static int gpio_keys_probe(struct platform_device *pdev)
bdata->irq = button->irq;
}
- INIT_DELAYED_WORK(&bdata->work, gpio_keys_irq_work_func);
+ schedule_delayed_work(&bdata->work,
+ msecs_to_jiffies(bdata->software_debounce));
ret = devm_request_threaded_irq(&pdev->dev,
bdata->irq, NULL, button_handle_irq,
@@ -621,9 +639,6 @@ static int gpio_keys_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n",
button->gpio, bdata->irq);
}
-
- if (bdata->b->type == EV_SW)
- button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata));
}
return 0;
@@ -634,7 +649,6 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button_dev *bdev;
int ret;
- int i;
ret = gpio_keys_button_probe(pdev, &bdev, 1);
@@ -648,9 +662,6 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
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;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-06 20:09:17 +0000