lkml.org 
[lkml]   [2012]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] leds: leds-pwm: Convert to use devm_get_pwm
On 11/10/2012 02:48 AM, Bryan Wu wrote:
> On Wed, Nov 7, 2012 at 3:42 AM, Peter Ujfalusi <peter.ujfalusi@ti.com> wrote:
>> Update the driver to use the new API for requesting pwm so we can take
>> advantage of the pwm_lookup table to find the correct pwm to be used for the
>> LED functionality.
>> If the devm_get_pwm fails we fall back to legacy mode to try to get the pwm.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
>> ---
>> drivers/leds/leds-pwm.c | 16 ++++++++++++++--
>> 1 file changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
>> index f2e44c7..6bf9445 100644
>> --- a/drivers/leds/leds-pwm.c
>> +++ b/drivers/leds/leds-pwm.c
>> @@ -47,6 +47,19 @@ static void led_pwm_set(struct led_classdev *led_cdev,
>> }
>> }
>>
>> +static struct pwm_device *led_pwm_request_pwm(struct platform_device *pdev,
>> + struct led_pwm *cur_led)
>> +{
>> + struct pwm_device *pwm;
>> +
>> + pwm = devm_pwm_get(&pdev->dev, cur_led->name);
>> + if (IS_ERR(pwm)) {
>> + dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
>> + pwm = pwm_request(cur_led->pwm_id, cur_led->name);
>
> Looks good, but why we still need to keep the old API pwm_request(),
> if devm_pwm_get() is the right replacement. AFAIK, devm_***() API will
> help to clean up if device probing fails.
>
> So if it is good enough, we can just replace pwm_request() to the devm_pwm_get()

I have greped for "leds_pwm" in arch/ and the only place it is used is the
arch/arm/mach-omap2/board-sdp4430sdp.c and that is not working at all (using
wrong ID for the PWM).
I think I can remove the legacy way of requesting the pwm from the driver
safely (I can also mark the pwm_id in struct led_pwm as deprecated at the same
time).
Will send the v2 soon.

Thank you,
Péter

>
> Thanks,
> -Bryan
>
>> + }
>> + return pwm;
>> +}
>> +
>> static int led_pwm_probe(struct platform_device *pdev)
>> {
>> struct led_pwm_platform_data *pdata = pdev->dev.platform_data;
>> @@ -67,8 +80,7 @@ static int led_pwm_probe(struct platform_device *pdev)
>> cur_led = &pdata->leds[i];
>> led_dat = &leds_data[i];
>>
>> - led_dat->pwm = pwm_request(cur_led->pwm_id,
>> - cur_led->name);
>> + led_dat->pwm = led_pwm_request_pwm(pdev, cur_led);
>> if (IS_ERR(led_dat->pwm)) {
>> ret = PTR_ERR(led_dat->pwm);
>> dev_err(&pdev->dev, "unable to request PWM %d\n",
>> --
>> 1.8.0
>>


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2012-11-12 10:21    [W:0.117 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site