Merge branch 'regmap-mfd' into regmap-next

drivers/mfd/Kconfig

@@ -404,6 +404,7 @@ config MFD_WM831X_I2C
 	bool "Support Wolfson Microelectronics WM831x/2x PMICs with I2C"
 	select MFD_CORE
 	select MFD_WM831X
+	select REGMAP_I2C
 	depends on I2C=y && GENERIC_HARDIRQS
 	help
 	  Support for the Wolfson Microelecronics WM831x and WM832x PMICs
@@ -415,6 +416,7 @@ config MFD_WM831X_SPI
 	bool "Support Wolfson Microelectronics WM831x/2x PMICs with SPI"
 	select MFD_CORE
 	select MFD_WM831X
+	select REGMAP_SPI
 	depends on SPI_MASTER && GENERIC_HARDIRQS
 	help
 	  Support for the Wolfson Microelecronics WM831x and WM832x PMICs
@@ -488,6 +490,7 @@ config MFD_WM8350_I2C
 config MFD_WM8994
 	bool "Support Wolfson Microelectronics WM8994"
 	select MFD_CORE
+	select REGMAP_I2C
 	depends on I2C=y && GENERIC_HARDIRQS
 	help
 	  The WM8994 is a highly integrated hi-fi CODEC designed for

drivers/mfd/wm831x-i2c.c

@@ -18,67 +18,17 @@
 #include <linux/delay.h>
 #include <linux/mfd/core.h>
 #include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/regmap.h>
 
 #include <linux/mfd/wm831x/core.h>
 #include <linux/mfd/wm831x/pdata.h>
 
-static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg,
-				  int bytes, void *dest)
-{
-	struct i2c_client *i2c = wm831x->control_data;
-	int ret;
-	u16 r = cpu_to_be16(reg);
-
-	ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
-	if (ret < 0)
-		return ret;
-	if (ret != 2)
-		return -EIO;
-
-	ret = i2c_master_recv(i2c, dest, bytes);
-	if (ret < 0)
-		return ret;
-	if (ret != bytes)
-		return -EIO;
-	return 0;
-}
-
-/* Currently we allocate the write buffer on the stack; this is OK for
- * small writes - if we need to do large writes this will need to be
- * revised.
- */
-static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg,
-				   int bytes, void *src)
-{
-	struct i2c_client *i2c = wm831x->control_data;
-	struct i2c_msg xfer[2];
-	int ret;
-
-	reg = cpu_to_be16(reg);
-
-	xfer[0].addr = i2c->addr;
-	xfer[0].flags = 0;
-	xfer[0].len = 2;
-	xfer[0].buf = (char *)&reg;
-
-	xfer[1].addr = i2c->addr;
-	xfer[1].flags = I2C_M_NOSTART;
-	xfer[1].len = bytes;
-	xfer[1].buf = (char *)src;
-
-	ret = i2c_transfer(i2c->adapter, xfer, 2);
-	if (ret < 0)
-		return ret;
-	if (ret != 2)
-		return -EIO;
-
-	return 0;
-}
-
 static int wm831x_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct wm831x *wm831x;
+	int ret;
 
 	wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
 	if (wm831x == NULL)
@@ -86,9 +36,15 @@ static int wm831x_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, wm831x);
 	wm831x->dev = &i2c->dev;
-	wm831x->control_data = i2c;
-	wm831x->read_dev = wm831x_i2c_read_device;
-	wm831x->write_dev = wm831x_i2c_write_device;
+
+	wm831x->regmap = regmap_init_i2c(i2c, &wm831x_regmap_config);
+	if (IS_ERR(wm831x->regmap)) {
+		ret = PTR_ERR(wm831x->regmap);
+		dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+			ret);
+		kfree(wm831x);
+		return ret;
+	}
 
 	return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
 }

drivers/mfd/wm831x-spi.c

@@ -16,78 +16,19 @@
 #include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/spi/spi.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
 
 #include <linux/mfd/wm831x/core.h>
 
-static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
-				  int bytes, void *dest)
-{
-	u16 tx_val;
-	u16 *d = dest;
-	int r, ret;
-
-	/* Go register at a time */
-	for (r = reg; r < reg + (bytes / 2); r++) {
-		tx_val = r | 0x8000;
-
-		ret = spi_write_then_read(wm831x->control_data,
-					  (u8 *)&tx_val, 2, (u8 *)d, 2);
-		if (ret != 0)
-			return ret;
-
-		*d = be16_to_cpu(*d);
-
-		d++;
-	}
-
-	return 0;
-}
-
-static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
-				   int bytes, void *src)
-{
-	struct spi_device *spi = wm831x->control_data;
-	u16 *s = src;
-	u16 data[2];
-	int ret, r;
-
-	/* Go register at a time */
-	for (r = reg; r < reg + (bytes / 2); r++) {
-		data[0] = r;
-		data[1] = *s++;
-
-		ret = spi_write(spi, (char *)&data, sizeof(data));
-		if (ret != 0)
-			return ret;
-	}
-
-	return 0;
-}
-
 static int __devinit wm831x_spi_probe(struct spi_device *spi)
 {
+	const struct spi_device_id *id = spi_get_device_id(spi);
 	struct wm831x *wm831x;
 	enum wm831x_parent type;
+	int ret;
 
-	/* Currently SPI support for ID tables is unmerged, we're faking it */
-	if (strcmp(spi->modalias, "wm8310") == 0)
-		type = WM8310;
-	else if (strcmp(spi->modalias, "wm8311") == 0)
-		type = WM8311;
-	else if (strcmp(spi->modalias, "wm8312") == 0)
-		type = WM8312;
-	else if (strcmp(spi->modalias, "wm8320") == 0)
-		type = WM8320;
-	else if (strcmp(spi->modalias, "wm8321") == 0)
-		type = WM8321;
-	else if (strcmp(spi->modalias, "wm8325") == 0)
-		type = WM8325;
-	else if (strcmp(spi->modalias, "wm8326") == 0)
-		type = WM8326;
-	else {
-		dev_err(&spi->dev, "Unknown device type\n");
-		return -EINVAL;
-	}
+	type = (enum wm831x_parent)id->driver_data;
 
 	wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
 	if (wm831x == NULL)
@@ -98,9 +39,15 @@ static int __devinit wm831x_spi_probe(struct spi_device *spi)
 
 	dev_set_drvdata(&spi->dev, wm831x);
 	wm831x->dev = &spi->dev;
-	wm831x->control_data = spi;
-	wm831x->read_dev = wm831x_spi_read_device;
-	wm831x->write_dev = wm831x_spi_write_device;
+
+	wm831x->regmap = regmap_init_spi(spi, &wm831x_regmap_config);
+	if (IS_ERR(wm831x->regmap)) {
+		ret = PTR_ERR(wm831x->regmap);
+		dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+			ret);
+		kfree(wm831x);
+		return ret;
+	}
 
 	return wm831x_device_init(wm831x, type, spi->irq);
 }
@@ -126,79 +73,26 @@ static const struct dev_pm_ops wm831x_spi_pm = {
 	.suspend = wm831x_spi_suspend,
 };
 
-static struct spi_driver wm8310_spi_driver = {
-	.driver = {
-		.name	= "wm8310",
-		.bus	= &spi_bus_type,
-		.owner	= THIS_MODULE,
-		.pm	= &wm831x_spi_pm,
-	},
-	.probe		= wm831x_spi_probe,
-	.remove		= __devexit_p(wm831x_spi_remove),
-};
-
-static struct spi_driver wm8311_spi_driver = {
-	.driver = {
-		.name	= "wm8311",
-		.bus	= &spi_bus_type,
-		.owner	= THIS_MODULE,
-		.pm	= &wm831x_spi_pm,
-	},
-	.probe		= wm831x_spi_probe,
-	.remove		= __devexit_p(wm831x_spi_remove),
-};
-
-static struct spi_driver wm8312_spi_driver = {
-	.driver = {
-		.name	= "wm8312",
-		.bus	= &spi_bus_type,
-		.owner	= THIS_MODULE,
-		.pm	= &wm831x_spi_pm,
-	},
-	.probe		= wm831x_spi_probe,
-	.remove		= __devexit_p(wm831x_spi_remove),
-};
-
-static struct spi_driver wm8320_spi_driver = {
-	.driver = {
-		.name	= "wm8320",
-		.bus	= &spi_bus_type,
-		.owner	= THIS_MODULE,
-		.pm	= &wm831x_spi_pm,
-	},
-	.probe		= wm831x_spi_probe,
-	.remove		= __devexit_p(wm831x_spi_remove),
-};
-
-static struct spi_driver wm8321_spi_driver = {
-	.driver = {
-		.name	= "wm8321",
-		.bus	= &spi_bus_type,
-		.owner	= THIS_MODULE,
-		.pm	= &wm831x_spi_pm,
-	},
-	.probe		= wm831x_spi_probe,
-	.remove		= __devexit_p(wm831x_spi_remove),
+static const struct spi_device_id wm831x_spi_ids[] = {
+	{ "wm8310", WM8310 },
+	{ "wm8311", WM8311 },
+	{ "wm8312", WM8312 },
+	{ "wm8320", WM8320 },
+	{ "wm8321", WM8321 },
+	{ "wm8325", WM8325 },
+	{ "wm8326", WM8326 },
+	{ },
 };
+MODULE_DEVICE_TABLE(spi, wm831x_spi_id);
 
-static struct spi_driver wm8325_spi_driver = {
+static struct spi_driver wm831x_spi_driver = {
 	.driver = {
-		.name	= "wm8325",
-		.bus	= &spi_bus_type,
-		.owner	= THIS_MODULE,
-		.pm	= &wm831x_spi_pm,
-	},
-	.probe		= wm831x_spi_probe,
-	.remove		= __devexit_p(wm831x_spi_remove),
-};
-
-static struct spi_driver wm8326_spi_driver = {
-	.driver = {
-		.name	= "wm8326",
+		.name	= "wm831x",
 		.bus	= &spi_bus_type,
 		.owner	= THIS_MODULE,
 		.pm	= &wm831x_spi_pm,
 	},
+	.id_table	= wm831x_spi_ids,
 	.probe		= wm831x_spi_probe,
 	.remove		= __devexit_p(wm831x_spi_remove),
 };
@@ -207,33 +101,9 @@ static int __init wm831x_spi_init(void)
 {
 	int ret;
 
-	ret = spi_register_driver(&wm8310_spi_driver);
-	if (ret != 0)
-		pr_err("Failed to register WM8310 SPI driver: %d\n", ret);
-
-	ret = spi_register_driver(&wm8311_spi_driver);
-	if (ret != 0)
-		pr_err("Failed to register WM8311 SPI driver: %d\n", ret);
-
-	ret = spi_register_driver(&wm8312_spi_driver);
-	if (ret != 0)
-		pr_err("Failed to register WM8312 SPI driver: %d\n", ret);
-
-	ret = spi_register_driver(&wm8320_spi_driver);
-	if (ret != 0)
-		pr_err("Failed to register WM8320 SPI driver: %d\n", ret);
-
-	ret = spi_register_driver(&wm8321_spi_driver);
-	if (ret != 0)
-		pr_err("Failed to register WM8321 SPI driver: %d\n", ret);
-
-	ret = spi_register_driver(&wm8325_spi_driver);
-	if (ret != 0)
-		pr_err("Failed to register WM8325 SPI driver: %d\n", ret);
-
-	ret = spi_register_driver(&wm8326_spi_driver);
+	ret = spi_register_driver(&wm831x_spi_driver);
 	if (ret != 0)
-		pr_err("Failed to register WM8326 SPI driver: %d\n", ret);
+		pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 
 	return 0;
 }
@@ -241,13 +111,7 @@ subsys_initcall(wm831x_spi_init);
 
 static void __exit wm831x_spi_exit(void)
 {
-	spi_unregister_driver(&wm8326_spi_driver);
-	spi_unregister_driver(&wm8325_spi_driver);
-	spi_unregister_driver(&wm8321_spi_driver);
-	spi_unregister_driver(&wm8320_spi_driver);
-	spi_unregister_driver(&wm8312_spi_driver);
-	spi_unregister_driver(&wm8311_spi_driver);
-	spi_unregister_driver(&wm8310_spi_driver);
+	spi_unregister_driver(&wm831x_spi_driver);
 }
 module_exit(wm831x_spi_exit);
 

drivers/mfd/wm8400-core.c

@@ -13,11 +13,13 @@
  */
 
 #include <linux/bug.h>
+#include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/wm8400-private.h>
 #include <linux/mfd/wm8400-audio.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 
 static struct {
@@ -123,14 +125,9 @@ static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest)
 	/* If there are any volatile reads then read back the entire block */
 	for (i = reg; i < reg + num_regs; i++)
 		if (reg_data[i].vol) {
-			ret = wm8400->read_dev(wm8400->io_data, reg,
-					       num_regs, dest);
-			if (ret != 0)
-				return ret;
-			for (i = 0; i < num_regs; i++)
-				dest[i] = be16_to_cpu(dest[i]);
-
-			return 0;
+			ret = regmap_bulk_read(wm8400->regmap, reg, dest,
+					       num_regs);
+			return ret;
 		}
 
 	/* Otherwise use the cache */
@@ -149,14 +146,11 @@ static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs,
 	for (i = 0; i < num_regs; i++) {
 		BUG_ON(!reg_data[reg + i].writable);
 		wm8400->reg_cache[reg + i] = src[i];
-		src[i] = cpu_to_be16(src[i]);
+		ret = regmap_write(wm8400->regmap, reg, src[i]);
+		if (ret != 0)
+			return ret;
 	}
 
-	/* Do the actual I/O */
-	ret = wm8400->write_dev(wm8400->io_data, reg, num_regs, src);
-	if (ret != 0)
-		return -EIO;
-
 	return 0;
 }
 
@@ -270,14 +264,14 @@ static int wm8400_init(struct wm8400 *wm8400,
 	dev_set_drvdata(wm8400->dev, wm8400);
 
 	/* Check that this is actually a WM8400 */
-	ret = wm8400->read_dev(wm8400->io_data, WM8400_RESET_ID, 1, &reg);
+	ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &i);
 	if (ret != 0) {
 		dev_err(wm8400->dev, "Chip ID register read failed\n");
 		return -EIO;
 	}
-	if (be16_to_cpu(reg) != reg_data[WM8400_RESET_ID].default_val) {
+	if (i != reg_data[WM8400_RESET_ID].default_val) {
 		dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
-			be16_to_cpu(reg));
+			reg);
 		return -ENODEV;
 	}
 
@@ -285,9 +279,8 @@ static int wm8400_init(struct wm8400 *wm8400,
 	 * is a PMIC we can't reset it safely so initialise the register
 	 * cache from the hardware.
 	 */
-	ret = wm8400->read_dev(wm8400->io_data, 0,
-			       ARRAY_SIZE(wm8400->reg_cache),
-			       wm8400->reg_cache);
+	ret = regmap_raw_read(wm8400->regmap, 0, wm8400->reg_cache,
+			      ARRAY_SIZE(wm8400->reg_cache));
 	if (ret != 0) {
 		dev_err(wm8400->dev, "Register cache read failed\n");
 		return -EIO;
@@ -337,60 +330,13 @@ static void wm8400_release(struct wm8400 *wm8400)
 	mfd_remove_devices(wm8400->dev);
 }
 
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
-static int wm8400_i2c_read(void *io_data, char reg, int count, u16 *dest)
-{
-	struct i2c_client *i2c = io_data;
-	struct i2c_msg xfer[2];
-	int ret;
-
-	/* Write register */
-	xfer[0].addr = i2c->addr;
-	xfer[0].flags = 0;
-	xfer[0].len = 1;
-	xfer[0].buf = &reg;
-
-	/* Read data */
-	xfer[1].addr = i2c->addr;
-	xfer[1].flags = I2C_M_RD;
-	xfer[1].len = count * sizeof(u16);
-	xfer[1].buf = (u8 *)dest;
-
-	ret = i2c_transfer(i2c->adapter, xfer, 2);
-	if (ret == 2)
-		ret = 0;
-	else if (ret >= 0)
-		ret = -EIO;
-
-	return ret;
-}
-
-static int wm8400_i2c_write(void *io_data, char reg, int count, const u16 *src)
-{
-	struct i2c_client *i2c = io_data;
-	u8 *msg;
-	int ret;
-
-	/* We add 1 byte for device register - ideally I2C would gather. */
-	msg = kmalloc((count * sizeof(u16)) + 1, GFP_KERNEL);
-	if (msg == NULL)
-		return -ENOMEM;
-
-	msg[0] = reg;
-	memcpy(&msg[1], src, count * sizeof(u16));
-
-	ret = i2c_master_send(i2c, msg, (count * sizeof(u16)) + 1);
-
-	if (ret == (count * 2) + 1)
-		ret = 0;
-	else if (ret >= 0)
-		ret = -EIO;
-
-	kfree(msg);
-
-	return ret;
-}
+static const struct regmap_config wm8400_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.max_register = WM8400_REGISTER_COUNT - 1,
+};
 
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 static int wm8400_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
@@ -403,18 +349,23 @@ static int wm8400_i2c_probe(struct i2c_client *i2c,
 		goto err;
 	}
 
-	wm8400->io_data = i2c;
-	wm8400->read_dev = wm8400_i2c_read;
-	wm8400->write_dev = wm8400_i2c_write;
+	wm8400->regmap = regmap_init_i2c(i2c, &wm8400_regmap_config);
+	if (IS_ERR(wm8400->regmap)) {
+		ret = PTR_ERR(wm8400->regmap);
+		goto struct_err;
+	}
+
 	wm8400->dev = &i2c->dev;
 	i2c_set_clientdata(i2c, wm8400);
 
 	ret = wm8400_init(wm8400, i2c->dev.platform_data);
 	if (ret != 0)
-		goto struct_err;
+		goto map_err;
 
 	return 0;
 
+map_err:
+	regmap_exit(wm8400->regmap);
 struct_err:
 	kfree(wm8400);
 err:
@@ -426,6 +377,7 @@ static int wm8400_i2c_remove(struct i2c_client *i2c)
 	struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
 
 	wm8400_release(wm8400);
+	regmap_exit(wm8400->regmap);
 	kfree(wm8400);
 
 	return 0;

drivers/mfd/wm8994-core.c

@@ -16,9 +16,11 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
+#include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/mfd/core.h>
 #include <linux/pm_runtime.h>
+#include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/regulator/machine.h>
 
@@ -29,22 +31,7 @@
 static int wm8994_read(struct wm8994 *wm8994, unsigned short reg,
 		       int bytes, void *dest)
 {
-	int ret, i;
-	u16 *buf = dest;
-
-	BUG_ON(bytes % 2);
-	BUG_ON(bytes <= 0);
-
-	ret = wm8994->read_dev(wm8994, reg, bytes, dest);
-	if (ret < 0)
-		return ret;
-
-	for (i = 0; i < bytes / 2; i++) {
-		dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n",
-			 be16_to_cpu(buf[i]), reg + i, reg + i);
-	}
-
-	return 0;
+	return regmap_raw_read(wm8994->regmap, reg, dest, bytes);
 }
 
 /**
@@ -55,19 +42,15 @@ static int wm8994_read(struct wm8994 *wm8994, unsigned short reg,
  */
 int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
 {
-	unsigned short val;
+	unsigned int val;
 	int ret;
 
-	mutex_lock(&wm8994->io_lock);
-
-	ret = wm8994_read(wm8994, reg, 2, &val);
-
-	mutex_unlock(&wm8994->io_lock);
+	ret = regmap_read(wm8994->regmap, reg, &val);
 
 	if (ret < 0)
 		return ret;
 	else
-		return be16_to_cpu(val);
+		return val;
 }
 EXPORT_SYMBOL_GPL(wm8994_reg_read);
 
@@ -82,33 +65,13 @@ EXPORT_SYMBOL_GPL(wm8994_reg_read);
 int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
 		     int count, u16 *buf)
 {
-	int ret;
-
-	mutex_lock(&wm8994->io_lock);
-
-	ret = wm8994_read(wm8994, reg, count * 2, buf);
-
-	mutex_unlock(&wm8994->io_lock);
-
-	return ret;
+	return regmap_bulk_read(wm8994->regmap, reg, buf, count);
 }
-EXPORT_SYMBOL_GPL(wm8994_bulk_read);
 
 static int wm8994_write(struct wm8994 *wm8994, unsigned short reg,
 			int bytes, const void *src)
 {
-	const u16 *buf = src;
-	int i;
-
-	BUG_ON(bytes % 2);
-	BUG_ON(bytes <= 0);
-
-	for (i = 0; i < bytes / 2; i++) {
-		dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n",
-			 be16_to_cpu(buf[i]), reg + i, reg + i);
-	}
-
-	return wm8994->write_dev(wm8994, reg, bytes, src);
+	return regmap_raw_write(wm8994->regmap, reg, src, bytes);
 }
 
 /**
@@ -121,17 +84,7 @@ static int wm8994_write(struct wm8994 *wm8994, unsigned short reg,
 int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
 		     unsigned short val)
 {
-	int ret;
-
-	val = cpu_to_be16(val);
-
-	mutex_lock(&wm8994->io_lock);
-
-	ret = wm8994_write(wm8994, reg, 2, &val);
-
-	mutex_unlock(&wm8994->io_lock);
-
-	return ret;
+	return regmap_write(wm8994->regmap, reg, val);
 }
 EXPORT_SYMBOL_GPL(wm8994_reg_write);
 
@@ -146,15 +99,7 @@ EXPORT_SYMBOL_GPL(wm8994_reg_write);
 int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
 		      int count, const u16 *buf)
 {
-	int ret;
-
-	mutex_lock(&wm8994->io_lock);
-
-	ret = wm8994_write(wm8994, reg, count * 2, buf);
-
-	mutex_unlock(&wm8994->io_lock);
-
-	return ret;
+	return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16));
 }
 EXPORT_SYMBOL_GPL(wm8994_bulk_write);
 
@@ -169,28 +114,7 @@ EXPORT_SYMBOL_GPL(wm8994_bulk_write);
 int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
 		    unsigned short mask, unsigned short val)
 {
-	int ret;
-	u16 r;
-
-	mutex_lock(&wm8994->io_lock);
-
-	ret = wm8994_read(wm8994, reg, 2, &r);
-	if (ret < 0)
-		goto out;
-
-	r = be16_to_cpu(r);
-
-	r &= ~mask;
-	r |= val;
-
-	r = cpu_to_be16(r);
-
-	ret = wm8994_write(wm8994, reg, 2, &r);
-
-out:
-	mutex_unlock(&wm8994->io_lock);
-
-	return ret;
+	return regmap_update_bits(wm8994->regmap, reg, mask, val);
 }
 EXPORT_SYMBOL_GPL(wm8994_set_bits);
 
@@ -378,6 +302,11 @@ static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 }
 #endif
 
+static struct regmap_config wm8994_regmap_config = {
+	.reg_bits = 16,
+	.val_bits = 16,
+};
+
 /*
  * Instantiate the generic non-control parts of the device.
  */
@@ -387,7 +316,6 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 	const char *devname;
 	int ret, i;
 
-	mutex_init(&wm8994->io_lock);
 	dev_set_drvdata(wm8994->dev, wm8994);
 
 	/* Add the on-chip regulators first for bootstrapping */
@@ -397,7 +325,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 			      NULL, 0);
 	if (ret != 0) {
 		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
-		goto err;
+		goto err_regmap;
 	}
 
 	switch (wm8994->type) {
@@ -409,7 +337,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 		break;
 	default:
 		BUG();
-		goto err;
+		goto err_regmap;
 	}
 
 	wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) *
@@ -417,7 +345,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 				   GFP_KERNEL);
 	if (!wm8994->supplies) {
 		ret = -ENOMEM;
-		goto err;
+		goto err_regmap;
 	}
 
 	switch (wm8994->type) {
@@ -431,7 +359,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 		break;
 	default:
 		BUG();
-		goto err;
+		goto err_regmap;
 	}
 		
 	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
@@ -554,7 +482,8 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 err_supplies:
 	kfree(wm8994->supplies);
-err:
+err_regmap:
+	regmap_exit(wm8994->regmap);
 	mfd_remove_devices(wm8994->dev);
 	kfree(wm8994);
 	return ret;
@@ -569,62 +498,15 @@ static void wm8994_device_exit(struct wm8994 *wm8994)
 			       wm8994->supplies);
 	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 	kfree(wm8994->supplies);
+	regmap_exit(wm8994->regmap);
 	kfree(wm8994);
 }
 
-static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg,
-				  int bytes, void *dest)
-{
-	struct i2c_client *i2c = wm8994->control_data;
-	int ret;
-	u16 r = cpu_to_be16(reg);
-
-	ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
-	if (ret < 0)
-		return ret;
-	if (ret != 2)
-		return -EIO;
-
-	ret = i2c_master_recv(i2c, dest, bytes);
-	if (ret < 0)
-		return ret;
-	if (ret != bytes)
-		return -EIO;
-	return 0;
-}
-
-static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg,
-				   int bytes, const void *src)
-{
-	struct i2c_client *i2c = wm8994->control_data;
-	struct i2c_msg xfer[2];
-	int ret;
-
-	reg = cpu_to_be16(reg);
-
-	xfer[0].addr = i2c->addr;
-	xfer[0].flags = 0;
-	xfer[0].len = 2;
-	xfer[0].buf = (char *)&reg;
-
-	xfer[1].addr = i2c->addr;
-	xfer[1].flags = I2C_M_NOSTART;
-	xfer[1].len = bytes;
-	xfer[1].buf = (char *)src;
-
-	ret = i2c_transfer(i2c->adapter, xfer, 2);
-	if (ret < 0)
-		return ret;
-	if (ret != 2)
-		return -EIO;
-
-	return 0;
-}
-
 static int wm8994_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct wm8994 *wm8994;
+	int ret;
 
 	wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL);
 	if (wm8994 == NULL)
@@ -632,12 +514,18 @@ static int wm8994_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, wm8994);
 	wm8994->dev = &i2c->dev;
-	wm8994->control_data = i2c;
-	wm8994->read_dev = wm8994_i2c_read_device;
-	wm8994->write_dev = wm8994_i2c_write_device;
 	wm8994->irq = i2c->irq;
 	wm8994->type = id->driver_data;
 
+	wm8994->regmap = regmap_init_i2c(i2c, &wm8994_regmap_config);
+	if (IS_ERR(wm8994->regmap)) {
+		ret = PTR_ERR(wm8994->regmap);
+		dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
+			ret);
+		kfree(wm8994);
+		return ret;
+	}
+
 	return wm8994_device_init(wm8994, i2c->irq);
 }
 

include/linux/mfd/wm831x/core.h

@@ -18,6 +18,7 @@
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/list.h>
+#include <linux/regmap.h>
 
 /*
  * Register values.
@@ -361,12 +362,8 @@ struct wm831x {
 	struct mutex io_lock;
 
 	struct device *dev;
-	int (*read_dev)(struct wm831x *wm831x, unsigned short reg,
-			int bytes, void *dest);
-	int (*write_dev)(struct wm831x *wm831x, unsigned short reg,
-			 int bytes, void *src);
 
-	void *control_data;
+	struct regmap *regmap;
 
 	int irq;  /* Our chip IRQ */
 	struct mutex irq_lock;
@@ -416,4 +413,6 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq);
 void wm831x_irq_exit(struct wm831x *wm831x);
 void wm831x_auxadc_init(struct wm831x *wm831x);
 
+extern struct regmap_config wm831x_regmap_config;
+
 #endif

include/linux/mfd/wm8400-private.h

@@ -25,16 +25,15 @@
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
 
+struct regmap;
+
 #define WM8400_REGISTER_COUNT 0x55
 
 struct wm8400 {
 	struct device *dev;
 
-	int (*read_dev)(void *data, char reg, int count, u16 *dst);
-	int (*write_dev)(void *data, char reg, int count, const u16 *src);
-
 	struct mutex io_lock;
-	void *io_data;
+	struct regmap *regmap;
 
 	u16 reg_cache[WM8400_REGISTER_COUNT];
 

include/linux/mfd/wm8994/core.h

@@ -24,6 +24,7 @@ enum wm8994_type {
 
 struct regulator_dev;
 struct regulator_bulk_data;
+struct regmap;
 
 #define WM8994_NUM_GPIO_REGS 11
 #define WM8994_NUM_LDO_REGS   2
@@ -50,18 +51,12 @@ struct regulator_bulk_data;
 #define WM8994_IRQ_GPIO(x) (x + WM8994_IRQ_TEMP_WARN)
 
 struct wm8994 {
-	struct mutex io_lock;
 	struct mutex irq_lock;
 
 	enum wm8994_type type;
 
 	struct device *dev;
-	int (*read_dev)(struct wm8994 *wm8994, unsigned short reg,
-			int bytes, void *dest);
-	int (*write_dev)(struct wm8994 *wm8994, unsigned short reg,
-			 int bytes, const void *src);
-
-	void *control_data;
+	struct regmap *regmap;
 
 	int gpio_base;
 	int irq_base;