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>

diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index 45cc7e6..ee8deef 100644 (file)
--- 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)