2015-05-21 0:37 GMT+08:00 Dmitry Torokhov <[email protected]>:
> Hi Barry,
>
> On Wed, May 20, 2015 at 06:02:36PM +0800, Barry Song wrote:
>> sometimes we press a key to boot, and the boot stage need to get this
>> event.
>> the current codes use edge trigger, so we have no chance to report
>> the cold-touch event.
>> but our user sceneries like Linux navigator does need it.
>
> Input events that come before input device is opened (either by
> userspace or by a kernel consumer) are ignored by input core and we
> already call gpio_keys_report_state() from gpio_keys_open() so I do not
> think this patch has any effect.
Dmitry,
you are right. i missed gpio_keys_open() has done that once it is opened.
556 static int gpio_keys_open(struct input_dev *input)
557 {
558 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
559 const struct gpio_keys_platform_data *pdata = ddata->pdata;
560 int error;
561
562 if (pdata->enable) {
563 error = pdata->enable(input->dev.parent);
564 if (error)
565 return error;
566 }
567
568 /* Report current state of buttons that are connected to GPIOs */
569 gpio_keys_report_state(ddata);
570
571 return 0;
572 }
>
> Thanks.
>
>>
>> Signed-off-by: Barry Song <[email protected]>
>> ---
>> -RFC: for the moment, only an idea
>>
>> drivers/input/keyboard/gpio_keys.c | 13 +++++++++++++
>> 1 file changed, 13 insertions(+)
>>
>> diff --git a/drivers/input/keyboard/gpio_keys.c
>> b/drivers/input/keyboard/gpio_keys.c
>> index ddf4045..77fe0dd 100644
>> --- a/drivers/input/keyboard/gpio_keys.c
>> +++ b/drivers/input/keyboard/gpio_keys.c
>> @@ -766,6 +766,19 @@ static int gpio_keys_probe(struct platform_device *pdev)
>>
>> device_init_wakeup(&pdev->dev, wakeup);
>>
>> + /* if the key is pressed while system boot, force an interrupt */
>> + for (i = 0; i < pdata->nbuttons; i++) {
>> + const struct gpio_keys_button *button = &pdata->buttons[i];
>> + struct gpio_button_data *bdata = &ddata->data[i];
>> + int state;
>> +
>> + if (gpio_is_valid(button->gpio)) {
>> + state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^
>> button->active_low;
>> + if (state)
>> + gpio_keys_gpio_isr(bdata->irq, bdata);
>> + }
>> + }
>> +
>> return 0;
>>
>> err_remove_group:
>> --
>> 1.9.1
>
> --
> Dmitry
-barry
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