Input: gpio-keys - change timer to workqueue

The gpio_get_value function of I2C/SPI GPIO expander may sleep thus this
function call can not be called in a timer function.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 12 insertions, 20 deletions

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 9767213b6c8f..2157cd7de00c 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -22,13 +22,14 @@
 #include <linux/platform_device.h>
 #include <linux/input.h>
 #include <linux/gpio_keys.h>
+#include <linux/workqueue.h>
 
 #include <asm/gpio.h>
 
 struct gpio_button_data {
         struct gpio_keys_button *button;
         struct input_dev *input;
-        struct timer_list timer;
+        struct delayed_work work;
 };
 
 struct gpio_keys_drvdata {
@@ -36,8 +37,10 @@ struct gpio_keys_drvdata {
         struct gpio_button_data data[0];
 };
 
-static void gpio_keys_report_event(struct gpio_button_data *bdata)
+static void gpio_keys_report_event(struct work_struct *work)
 {
+        struct gpio_button_data *bdata =
+                container_of(work, struct gpio_button_data, work.work);
         struct gpio_keys_button *button = bdata->button;
         struct input_dev *input = bdata->input;
         unsigned int type = button->type ?: EV_KEY;
@@ -47,25 +50,17 @@ static void gpio_keys_report_event(struct gpio_button_data *bdata)
         input_sync(input);
 }
 
-static void gpio_check_button(unsigned long _data)
-{
-        struct gpio_button_data *data = (struct gpio_button_data *)_data;
-
-        gpio_keys_report_event(data);
-}
-
 static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
 {
         struct gpio_button_data *bdata = dev_id;
         struct gpio_keys_button *button = bdata->button;
+        unsigned long delay;
 
         BUG_ON(irq != gpio_to_irq(button->gpio));
 
-        if (button->debounce_interval)
-                mod_timer(&bdata->timer,
-                        jiffies + msecs_to_jiffies(button->debounce_interval));
-        else
-                gpio_keys_report_event(bdata);
+        delay = button->debounce_interval ?
+                        msecs_to_jiffies(button->debounce_interval) : 0;
+        schedule_delayed_work(&bdata->work, delay);
 
         return IRQ_HANDLED;
 }
@@ -112,8 +107,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
 
                 bdata->input = input;
                 bdata->button = button;
-                setup_timer(&bdata->timer,
-                            gpio_check_button, (unsigned long)bdata);
+                INIT_DELAYED_WORK(&bdata->work, gpio_keys_report_event);
 
                 error = gpio_request(button->gpio, button->desc ?: "gpio_keys");
                 if (error < 0) {
@@ -172,8 +166,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
  fail2:
         while (--i >= 0) {
                 free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
-                if (pdata->buttons[i].debounce_interval)
-                        del_timer_sync(&ddata->data[i].timer);
+                cancel_delayed_work_sync(&ddata->data[i].work);
                 gpio_free(pdata->buttons[i].gpio);
         }
 
@@ -197,8 +190,7 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
         for (i = 0; i < pdata->nbuttons; i++) {
                 int irq = gpio_to_irq(pdata->buttons[i].gpio);
                 free_irq(irq, &ddata->data[i]);
-                if (pdata->buttons[i].debounce_interval)
-                        del_timer_sync(&ddata->data[i].timer);
+                cancel_delayed_work_sync(&ddata->data[i].work);
                 gpio_free(pdata->buttons[i].gpio);
         }