Hi Alek,
>
> From 35101ecc80cfc638ac80a2cea590ab86135be395 Mon Sep 17 00:00:00 2001
> From: Alek Du <alek.du@xxxxxxxxx>
> Date: Fri, 8 May 2009 12:25:34 +0800
> Subject: [PATCH] input: Change timer function to workqueue for gpio_keys driver
>
> 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@xxxxxxxxx>
> ---
> drivers/input/keyboard/gpio_keys.c | 32 ++++++++++++++------------------
> 1 files changed, 14 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index ad67d76..9205ac6 100644
> --- a/drivers/input/keyboard/gpio_keys.c
> +++ b/drivers/input/keyboard/gpio_keys.c
> @@ -22,13 +22,17 @@
> #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;
> +/* Change timer func to workqueue func due to the fact that gpio_get_value
> + * may sleep for some i2c and spi GPIO expander
> + */
This is anyway goes into commit text and git history, so I don't see
any additional value in keeping this comment here. Patch looks good
otherwise, but it is better if someone can verify this driver having
direct gpio keys.
> + struct delayed_work work;
> };
>
> struct gpio_keys_drvdata {
> @@ -36,8 +40,10 @@ 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;
> @@ -47,13 +53,6 @@ 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;
> @@ -62,10 +61,10 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
> BUG_ON(irq != gpio_to_irq(button->gpio));
>
> if (button->debounce_interval)
> - mod_timer(&bdata->timer,
> - jiffies + msecs_to_jiffies(button->debounce_interval));
> + schedule_delayed_work(&bdata->work,
> + msecs_to_jiffies(button->debounce_interval));
> else
> - gpio_keys_report_event(bdata);
> + schedule_work(&bdata->work.work);
>
> return IRQ_HANDLED;
> }
> @@ -112,8 +111,7 @@ 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) {
> @@ -173,8 +171,7 @@ 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);
> }
>
> @@ -198,8 +195,7 @@ 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);
> }
>
> --
> 1.6.0.4
>
--
---Trilok Soni
http://triloksoni.wordpress.com
http://www.linkedin.com/in/triloksoni
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