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authorVasily Khoruzhick <anarsoul@gmail.com>2010-03-15 16:27:08 +0200
committerBen Dooks <ben-linux@fluff.org>2010-03-15 22:43:33 +0000
commite79032aa75af76a14e2cdd973b199855e7761881 (patch)
tree0dfefe4a63ce0afafd782eda859be26250b93f20 /arch
parent664e87e47e086962a832f9a613a8fd4042a02ac1 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/plat-samsung/pwm.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/pwm.c b/arch/arm/plat-samsung/pwm.c
index ef019f27b67d..f2d11390d01c 100644
--- a/arch/arm/plat-samsung/pwm.c
+++ b/arch/arm/plat-samsung/pwm.c
@@ -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)