ARM: SAMSUNG: Revise PM for 12-bit ADC operations

- Fixed: 12bit precision is lost at suspend/resume
- Updated: use pm_dev_ops

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index 45cc7e6982c1..ee8deef19481 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -437,8 +437,10 @@ static int __devexit s3c_adc_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
-static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
+static int s3c_adc_suspend(struct device *dev)
 {
+        struct platform_device *pdev = container_of(dev,
+                        struct platform_device, dev);
         struct adc_device *adc = platform_get_drvdata(pdev);
         unsigned long flags;
         u32 con;
@@ -457,10 +459,13 @@ static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
         return 0;
 }
 
-static int s3c_adc_resume(struct platform_device *pdev)
+static int s3c_adc_resume(struct device *dev)
 {
+        struct platform_device *pdev = container_of(dev,
+                        struct platform_device, dev);
         struct adc_device *adc = platform_get_drvdata(pdev);
         int ret;
+        unsigned long tmp;
 
         ret = regulator_enable(adc->vdd);
         if (ret)
@@ -468,8 +473,11 @@ static int s3c_adc_resume(struct platform_device *pdev)
         clk_enable(adc->clk);
         enable_irq(adc->irq);
 
-        writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
-               adc->regs + S3C2410_ADCCON);
+        tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
+        /* Enable 12-bit ADC resolution */
+        if (platform_get_device_id(pdev)->driver_data != TYPE_ADCV1)
+                tmp |= S3C64XX_ADCCON_RESSEL;
+        writel(tmp, adc->regs + S3C2410_ADCCON);
 
         return 0;
 }
@@ -494,16 +502,20 @@ static struct platform_device_id s3c_adc_driver_ids[] = {
 };
 MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);
 
+static const struct dev_pm_ops adc_pm_ops = {
+        .suspend        = s3c_adc_suspend,
+        .resume         = s3c_adc_resume,
+};
+
 static struct platform_driver s3c_adc_driver = {
         .id_table       = s3c_adc_driver_ids,
         .driver         = {
                 .name   = "s3c-adc",
                 .owner  = THIS_MODULE,
+                .pm     = &adc_pm_ops,
         },
         .probe          = s3c_adc_probe,
         .remove         = __devexit_p(s3c_adc_remove),
-        .suspend        = s3c_adc_suspend,
-        .resume         = s3c_adc_resume,
 };
 
 static int __init adc_init(void)