ARM: SAMSUNG: Add suspend/resume support for S3C PWM driver
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>
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@ -379,6 +379,39 @@ static int __devexit s3c_pwm_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_PM
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static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct pwm_device *pwm = platform_get_drvdata(pdev);
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/* No one preserve these values during suspend so reset them
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* Otherwise driver leaves PWM unconfigured if same values
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* passed to pwm_config
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*/
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pwm->period_ns = 0;
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pwm->duty_ns = 0;
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return 0;
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}
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static int s3c_pwm_resume(struct platform_device *pdev)
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{
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struct pwm_device *pwm = platform_get_drvdata(pdev);
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unsigned long tcon;
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/* Restore invertion */
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tcon = __raw_readl(S3C2410_TCON);
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tcon |= pwm_tcon_invert(pwm);
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__raw_writel(tcon, S3C2410_TCON);
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return 0;
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}
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#else
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#define s3c_pwm_suspend NULL
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#define s3c_pwm_resume NULL
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#endif
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static struct platform_driver s3c_pwm_driver = {
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.driver = {
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.name = "s3c24xx-pwm",
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@ -386,6 +419,8 @@ static struct platform_driver s3c_pwm_driver = {
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},
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.probe = s3c_pwm_probe,
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.remove = __devexit_p(s3c_pwm_remove),
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.suspend = s3c_pwm_suspend,
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.resume = s3c_pwm_resume,
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};
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static int __init pwm_init(void)
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