mfd: convert DS1WM to use MFD core

This patch converts the DS1WM driver into an MFD cell. It also
calculates the bus_shift parameter from the memory resource size.
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

drivers/w1/masters/ds1wm.c

@@ -19,7 +19,8 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/delay.h>
-#include <linux/ds1wm.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/ds1wm.h>
 
 #include <asm/io.h>
 
@@ -89,7 +90,7 @@ struct ds1wm_data {
 	void		__iomem *map;
 	int		bus_shift; /* # of shifts to calc register offsets */
 	struct platform_device *pdev;
-	struct ds1wm_platform_data *pdata;
+	struct mfd_cell	*cell;
 	int		irq;
 	int		active_high;
 	struct clk	*clk;
@@ -217,8 +218,8 @@ static void ds1wm_up(struct ds1wm_data *ds1wm_data)
 {
 	int gclk, divisor;
 
-	if (ds1wm_data->pdata->enable)
-		ds1wm_data->pdata->enable(ds1wm_data->pdev);
+	if (ds1wm_data->cell->enable)
+		ds1wm_data->cell->enable(ds1wm_data->pdev);
 
 	gclk = clk_get_rate(ds1wm_data->clk);
 	clk_enable(ds1wm_data->clk);
@@ -244,8 +245,8 @@ static void ds1wm_down(struct ds1wm_data *ds1wm_data)
 	ds1wm_write_register(ds1wm_data, DS1WM_INT_EN,
 			     ds1wm_data->active_high ? DS1WM_INTEN_IAS : 0);
 
-	if (ds1wm_data->pdata->disable)
-		ds1wm_data->pdata->disable(ds1wm_data->pdev);
+	if (ds1wm_data->cell->disable)
+		ds1wm_data->cell->disable(ds1wm_data->pdev);
 
 	clk_disable(ds1wm_data->clk);
 }
@@ -330,13 +331,18 @@ static struct w1_bus_master ds1wm_master = {
 static int ds1wm_probe(struct platform_device *pdev)
 {
 	struct ds1wm_data *ds1wm_data;
-	struct ds1wm_platform_data *plat;
+	struct ds1wm_driver_data *plat;
 	struct resource *res;
+	struct mfd_cell *cell;
 	int ret;
 
 	if (!pdev)
 		return -ENODEV;
 
+	cell = pdev->dev.platform_data;
+	if (!cell)
+		return -ENODEV;
+
 	ds1wm_data = kzalloc(sizeof(*ds1wm_data), GFP_KERNEL);
 	if (!ds1wm_data)
 		return -ENOMEM;
@@ -348,15 +354,18 @@ static int ds1wm_probe(struct platform_device *pdev)
 		ret = -ENXIO;
 		goto err0;
 	}
-	ds1wm_data->map = ioremap(res->start, res->end - res->start + 1);
+	ds1wm_data->map = ioremap(res->start, resource_size(res));
 	if (!ds1wm_data->map) {
 		ret = -ENOMEM;
 		goto err0;
 	}
-	plat = pdev->dev.platform_data;
-	ds1wm_data->bus_shift = plat->bus_shift;
+	plat = cell->driver_data;
+
+	/* calculate bus shift from mem resource */
+	ds1wm_data->bus_shift = resource_size(res) >> 3;
+
 	ds1wm_data->pdev = pdev;
-	ds1wm_data->pdata = plat;
+	ds1wm_data->cell = cell;
 
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (!res) {

include/linux/ds1wm.h

-/* platform data for the DS1WM driver */
-
-struct ds1wm_platform_data {
-	int bus_shift;	    /* number of shifts needed to calculate the
-			     * offset between DS1WM registers;
-			     * e.g. on h5xxx and h2200 this is 2
-			     * (registers aligned to 4-byte boundaries),
-			     * while on hx4700 this is 1 */
-	int active_high;
-	void (*enable)(struct platform_device *pdev);
-	void (*disable)(struct platform_device *pdev);
-};

include/linux/mfd/ds1wm.h

+/* MFD cell driver data for the DS1WM driver */
+
+struct ds1wm_driver_data {
+	int active_high;
+};