mfd: input: iio: ti_am335x_adc: use one structure for ti_tscadc_dev

The mfd driver creates platform data for the child devices and it is the
ti_tscadc_dev struct. This struct is copied for the two devices.
The copy of the structure makes a common lock in this structure a little
less usefull. Therefore the platform data is not a pointer to the
structure and the same structure is used.
While doing the change I noticed that the suspend/resume code assumes
the wrong pointer for ti_tscadc_dev and this has been fixed as well.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

4 files changed, 23 insertions, 13 deletions

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 5f9a7e7d3135..9db352e413e4 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -140,7 +140,7 @@ static int tiadc_probe(struct platform_device *pdev)
 {
         struct iio_dev          *indio_dev;
         struct tiadc_device     *adc_dev;
-        struct ti_tscadc_dev    *tscadc_dev = pdev->dev.platform_data;
+        struct ti_tscadc_dev    *tscadc_dev = ti_tscadc_dev_get(pdev);
         struct mfd_tscadc_board *pdata;
         int                     err;
 
@@ -205,9 +205,10 @@ static int tiadc_suspend(struct device *dev)
 {
         struct iio_dev *indio_dev = dev_get_drvdata(dev);
         struct tiadc_device *adc_dev = iio_priv(indio_dev);
-        struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
+        struct ti_tscadc_dev *tscadc_dev;
         unsigned int idle;
 
+        tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
         if (!device_may_wakeup(tscadc_dev->dev)) {
                 idle = tiadc_readl(adc_dev, REG_CTRL);
                 idle &= ~(CNTRLREG_TSCSSENB);
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 51e7b87827a4..16077d3d80ba 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -262,7 +262,7 @@ static int titsc_probe(struct platform_device *pdev)
 {
         struct titsc *ts_dev;
         struct input_dev *input_dev;
-        struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
+        struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
         struct mfd_tscadc_board *pdata;
         int err;
 
@@ -329,8 +329,8 @@ err_free_mem:
 
 static int titsc_remove(struct platform_device *pdev)
 {
-        struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
-        struct titsc *ts_dev = tscadc_dev->tsc;
+        struct titsc *ts_dev = platform_get_drvdata(pdev);
+        u32 steps;
 
         free_irq(ts_dev->irq, ts_dev);
 
@@ -344,10 +344,11 @@ static int titsc_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int titsc_suspend(struct device *dev)
 {
-        struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
-        struct titsc *ts_dev = tscadc_dev->tsc;
+        struct titsc *ts_dev = dev_get_drvdata(dev);
+        struct ti_tscadc_dev *tscadc_dev;
         unsigned int idle;
 
+        tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
         if (device_may_wakeup(tscadc_dev->dev)) {
                 idle = titsc_readl(ts_dev, REG_IRQENABLE);
                 titsc_writel(ts_dev, REG_IRQENABLE,
@@ -359,9 +360,10 @@ static int titsc_suspend(struct device *dev)
 
 static int titsc_resume(struct device *dev)
 {
-        struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
-        struct titsc *ts_dev = tscadc_dev->tsc;
+        struct titsc *ts_dev = dev_get_drvdata(dev);
+        struct ti_tscadc_dev *tscadc_dev;
 
+        tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
         if (device_may_wakeup(tscadc_dev->dev)) {
                 titsc_writel(ts_dev, REG_IRQWAKEUP,
                                 0x00);
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e9f3fb510b44..772ea2adb539 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -176,14 +176,14 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
         /* TSC Cell */
         cell = &tscadc->cells[TSC_CELL];
         cell->name = "tsc";
-        cell->platform_data = tscadc;
-        cell->pdata_size = sizeof(*tscadc);
+        cell->platform_data = &tscadc;
+        cell->pdata_size = sizeof(tscadc);
 
         /* ADC Cell */
         cell = &tscadc->cells[ADC_CELL];
         cell->name = "tiadc";
-        cell->platform_data = tscadc;
-        cell->pdata_size = sizeof(*tscadc);
+        cell->platform_data = &tscadc;
+        cell->pdata_size = sizeof(tscadc);
 
         err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
                         TSCADC_CELLS, NULL, 0, NULL);
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index c79ad5d2f271..8114e4e8b91b 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -149,4 +149,11 @@ struct ti_tscadc_dev {
         struct adc_device *adc;
 };
 
+static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
+{
+        struct ti_tscadc_dev **tscadc_dev = p->dev.platform_data;
+
+        return *tscadc_dev;
+}
+
 #endif