On 06/14/12 10:08, Zumeng Chen wrote:
> 于 2012年06月14日 14:44, Igor Grinberg 写道:
>> On 06/14/12 07:46, Zumeng Chen wrote:
>>> > 于 2012年06月13日 20:18, Hiremath, Vaibhav 写道:
>>>> >> On Wed, Jun 13, 2012 at 07:14:10, Zumeng Chen wrote:
>>>>> >>> From: Zumeng Chen<zumeng.chen@xxxxxxxxxxxxx>
>>>>> >>>
>>>>> >>> If we don't set proper debouce time for ads7846, then there are
>>>>> >>> flooded interrupt counters of ads7846 responding to one time
>>>>> >>> touch on screen, so the driver couldn't work well.
>>>>> >>>
>>>>> >>> And since most OMAP3 series boards pass NULL pointer of board_pdata
>>>>> >>> to omap_ads7846_init, so it's more proper to set it in driver level
>>>>> >>> after having gpio_request done.
>>>>> >>>
>>>>> >>> This patch has been validated on 3530evm.
>>>>> >>>
>>>>> >>> Signed-off-by: Zumeng Chen<zumeng.chen@xxxxxxxxxxxxx>
>>>>> >>> Signed-off-by: Syed Mohammed Khasim<khasim@xxxxxx>
>>>>> >>> ---
>>>>> >>> drivers/input/touchscreen/ads7846.c | 4 ++++
>>>>> >>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>>>> >>>
>>>>> >>> diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
>>>>> >>> index f02028e..459ff29 100644
>>>>> >>> --- a/drivers/input/touchscreen/ads7846.c
>>>>> >>> +++ b/drivers/input/touchscreen/ads7846.c
>>>>> >>> @@ -980,6 +980,10 @@ static int __devinit ads7846_setup_pendown(struct spi_device *spi, struct ads784
>>>>> >>> }
>>>>> >>>
>>>>> >>> ts->gpio_pendown = pdata->gpio_pendown;
>>>>> >>> +#ifdef CONFIG_ARCH_OMAP3
>>>>> >>> + /* 310 means about 10 microsecond for omap3 */
>>>>> >>> + gpio_set_debounce(pdata->gpio_pendown, 310);
>>>>> >>> +#endif
>>>>> >>>
>>>> >> Zumeng,
>>>> >>
>>>> >> With my sign-off you are changing the original code, that too
>>>> >> without my sign-off and ack.
>>>> >> I wouldn't mind you to submit patches from my tree, but the expectation is
>>>> >> if you are changing the original code, it should be under your sign-off.
>>> > Thanks, good to learn. I'll remove in next time.
>>>> >> Coming to the patch, #ifdef in driver is not recommended, and this 10msec
>>>> >> delay is specific to OMAP GPIO and driver should not be aware of this,
>>>> >> that's where you will find the original patch handling it in board file.
>>> > According to the git blame of the board-omap3evm.c I think
>>> > 96974a24 did a good thing to all the related codes for omap3
>>> > boards. So I think we can call board and driver as BSP level :-)
>>> >
>>> > If #ifdef in driver can save many codes, I guess it's deserved.
>> No, platform/board specific ifdefs in the generic driver code are never
>> deserved.
>> How about the attached patch, does it fix the problem for you?
> Sorry Igor, I just read your patch, yes, most are there, and we
> just have to set get_pendown_state as you early said. Really
> *thanks* for your drive :)
No, with my patch, you don't need the get_pendown_state() and
you don't need to change the board-omap3evm.c ADS7846 related code.
So, I'm going to submit my patch properly.
>
> Regards,
> Zumeng
>> -- Regards, Igor.
>> ads7846.patch
>>
>>
>> diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c
>> index 1706ebc..c187586 100644
>> --- a/arch/arm/mach-omap2/common-board-devices.c
>> +++ b/arch/arm/mach-omap2/common-board-devices.c
>> @@ -63,28 +63,30 @@ void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
>> struct spi_board_info *spi_bi = &ads7846_spi_board_info;
>> int err;
>>
>> - if (board_pdata && board_pdata->get_pendown_state) {
>> - err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
>> - if (err) {
>> - pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
>> - return;
>> - }
>> - gpio_export(gpio_pendown, 0);
>> -
>> - if (gpio_debounce)
>> - gpio_set_debounce(gpio_pendown, gpio_debounce);
>> + err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
>> + if (err) {
>> + pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
>> + return;
>> }
>>
>> + if (gpio_debounce)
>> + gpio_set_debounce(gpio_pendown, gpio_debounce);
>> +
>> spi_bi->bus_num = bus_num;
>> spi_bi->irq = gpio_to_irq(gpio_pendown);
>>
>> if (board_pdata) {
>> board_pdata->gpio_pendown = gpio_pendown;
>> spi_bi->platform_data = board_pdata;
>> + if (board_pdata->get_pendown_state)
>> + gpio_export(gpio_pendown, 0);
>> } else {
>> ads7846_config.gpio_pendown = gpio_pendown;
>> }
>>
>> + if (!board_pdata || (board_pdata && !board_pdata->get_pendown_state))
>> + gpio_free(gpio_pendown);
>> +
>> spi_register_board_info(&ads7846_spi_board_info, 1);
>> }
>> #else
>
--
Regards,
Igor.
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