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ARM: SAMSUNG: Add suspend/resume support for S3C PWM driver

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Reset period_ns and duty_ns values in suspend handler to avoid skip of
configuration if same values passed to pwm_config;
Restore invertion bit in resume handler.

Without this patch PWM works incorrectly after resume from suspend.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Vasily Khoruzhick 2010-03-15 16:27:08 +02:00 committed by Ben Dooks
parent 664e87e47e
commit e79032aa75
1 changed files with 35 additions and 0 deletions
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35
arch/arm/plat-samsung/pwm.c
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@ -379,6 +379,39 @@ static int __devexit s3c_pwm_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)
{
struct pwm_device *pwm = platform_get_drvdata(pdev);
/* No one preserve these values during suspend so reset them
* Otherwise driver leaves PWM unconfigured if same values
* passed to pwm_config
*/
pwm->period_ns = 0;
pwm->duty_ns = 0;
return 0;
}
static int s3c_pwm_resume(struct platform_device *pdev)
{
struct pwm_device *pwm = platform_get_drvdata(pdev);
unsigned long tcon;
/* Restore invertion */
tcon = __raw_readl(S3C2410_TCON);
tcon |= pwm_tcon_invert(pwm);
__raw_writel(tcon, S3C2410_TCON);
return 0;
}
#else
#define s3c_pwm_suspend NULL
#define s3c_pwm_resume NULL
#endif
static struct platform_driver s3c_pwm_driver = {
.driver = {
.name = "s3c24xx-pwm",
@ -386,6 +419,8 @@ static struct platform_driver s3c_pwm_driver = {
},
.probe = s3c_pwm_probe,
.remove = __devexit_p(s3c_pwm_remove),
.suspend = s3c_pwm_suspend,
.resume = s3c_pwm_resume,
};
static int __init pwm_init(void)