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From:   Shreeya Patel <shreeya.patel23498@gmail.com>
To:     lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org,
        knaack.h@gmx.de, pmeerw@pmeerw.net, gregkh@linuxfoundation.org,
        linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org, jeremyfertic@gmail.com,
        shreeya.patel23498@gmail.com
Subject: [PATCH v4 3/3] Staging: iio: adt7316: Add regmap support
Date:   Sat, 26 Jan 2019 23:04:02 +0530
Message-Id: <20190126173402.12428-4-shreeya.patel23498@gmail.com>
In-Reply-To: <20190126173402.12428-1-shreeya.patel23498@gmail.com>
References: <20190126173402.12428-1-shreeya.patel23498@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Both i2c and spi drivers have functions for reading and writing
to/from registers. Remove this redundant and common code by using
regmap API.

Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>
---
 drivers/staging/iio/addac/adt7316-i2c.c |  56 +++-------
 drivers/staging/iio/addac/adt7316-spi.c |  74 +++----------
 drivers/staging/iio/addac/adt7316.c     | 134 ++++++++++++------------
 drivers/staging/iio/addac/adt7316.h     |  10 +-
 4 files changed, 95 insertions(+), 179 deletions(-)

diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c
index 167eafe3dd8c..435b65845174 100644
--- a/drivers/staging/iio/addac/adt7316-i2c.c
+++ b/drivers/staging/iio/addac/adt7316-i2c.c
@@ -12,60 +12,28 @@
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
 
 #include "adt7316.h"
 
-/*
- * adt7316 register access by I2C
- */
-static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
-{
-	struct i2c_client *cl = client;
-	int ret;
-
-	ret = i2c_smbus_write_byte(cl, reg);
-	if (ret < 0) {
-		dev_err(&cl->dev, "I2C fail to select reg\n");
-		return ret;
-	}
-
-	ret = i2c_smbus_read_byte(client);
-	if (ret < 0) {
-		dev_err(&cl->dev, "I2C read error\n");
-		return ret;
-	}
-
-	*data = ret;
-
-	return 0;
-}
-
-static int adt7316_i2c_write(void *client, u8 reg, u8 data)
-{
-	struct i2c_client *cl = client;
-	int ret;
-
-	ret = i2c_smbus_write_byte_data(cl, reg, data);
-	if (ret < 0)
-		dev_err(&cl->dev, "I2C write error\n");
-
-	return ret;
-}
-
 /*
  * device probe and remove
  */
-
 static int adt7316_i2c_probe(struct i2c_client *client,
 			     const struct i2c_device_id *id)
 {
-	struct adt7316_bus bus = {
-		.client = client,
-		.read = adt7316_i2c_read,
-		.write = adt7316_i2c_write,
-	};
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i2c(client, &adt7316_regmap_config);
+
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Error initializing i2c regmap: %ld\n",
+			PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
 
-	return adt7316_probe(&client->dev, &bus, id->name, client->irq);
+	return adt7316_probe(&client->dev, regmap, id ? id->name : NULL,
+			     client->irq);
 }
 
 static const struct i2c_device_id adt7316_i2c_id[] = {
diff --git a/drivers/staging/iio/addac/adt7316-spi.c b/drivers/staging/iio/addac/adt7316-spi.c
index 06c943c2cc01..203b5c3ada6e 100644
--- a/drivers/staging/iio/addac/adt7316-spi.c
+++ b/drivers/staging/iio/addac/adt7316-spi.c
@@ -11,74 +11,19 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
+#include <linux/regmap.h>
 #include <linux/spi/spi.h>
 
 #include "adt7316.h"
 
 #define ADT7316_SPI_MAX_FREQ_HZ		5000000
-#define ADT7316_SPI_CMD_READ		0x91
-#define ADT7316_SPI_CMD_WRITE		0x90
-
-/*
- * adt7316 register access by SPI
- */
-
-static int adt7316_spi_read(void *client, u8 reg, u8 *data)
-{
-	struct spi_device *spi_dev = client;
-	u8 cmd[2];
-	int ret;
-
-	cmd[0] = ADT7316_SPI_CMD_WRITE;
-	cmd[1] = reg;
-
-	ret = spi_write(spi_dev, cmd, 2);
-	if (ret < 0) {
-		dev_err(&spi_dev->dev, "SPI fail to select reg\n");
-		return ret;
-	}
-
-	cmd[0] = ADT7316_SPI_CMD_READ;
-
-	ret = spi_write_then_read(spi_dev, cmd, 1, data, 1);
-	if (ret < 0) {
-		dev_err(&spi_dev->dev, "SPI read data error\n");
-		return ret;
-	}
-
-	return 0;
-}
-
-static int adt7316_spi_write(void *client, u8 reg, u8 val)
-{
-	struct spi_device *spi_dev = client;
-	u8 buf[ADT7316_REG_MAX_ADDR + 2];
-	int ret = 0;
-
-	buf[0] = ADT7316_SPI_CMD_WRITE;
-	buf[1] = reg;
-	buf[2] = val;
-
-	ret = spi_write(spi_dev, buf, 3);
-	if (ret < 0) {
-		dev_err(&spi_dev->dev, "SPI write error\n");
-		return ret;
-	}
-
-	return ret;
-}
 
 /*
  * device probe and remove
  */
-
 static int adt7316_spi_probe(struct spi_device *spi_dev)
 {
-	struct adt7316_bus bus = {
-		.client = spi_dev,
-		.read = adt7316_spi_read,
-		.write = adt7316_spi_write,
-	};
+	struct regmap *regmap;
 
 	/* don't exceed max specified SPI CLK frequency */
 	if (spi_dev->max_speed_hz > ADT7316_SPI_MAX_FREQ_HZ) {
@@ -87,12 +32,19 @@ static int adt7316_spi_probe(struct spi_device *spi_dev)
 		return -EINVAL;
 	}
 
+	regmap = devm_regmap_init_spi(spi_dev, &adt7316_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi_dev->dev, "Error initializing spi regmap: %ld\n",
+			PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
 	/* switch from default I2C protocol to SPI protocol */
-	adt7316_spi_write(spi_dev, 0, 0);
-	adt7316_spi_write(spi_dev, 0, 0);
-	adt7316_spi_write(spi_dev, 0, 0);
+	regmap_write(regmap, 0, 0);
+	regmap_write(regmap, 0, 0);
+	regmap_write(regmap, 0, 0);
 
-	return adt7316_probe(&spi_dev->dev, &bus, spi_dev->modalias,
+	return adt7316_probe(&spi_dev->dev, regmap, spi_dev->modalias,
 			     spi_dev->irq);
 }
 
diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
index 7c4f84822c18..922f827da8c4 100644
--- a/drivers/staging/iio/addac/adt7316.c
+++ b/drivers/staging/iio/addac/adt7316.c
@@ -17,6 +17,7 @@
 #include <linux/list.h>
 #include <linux/i2c.h>
 #include <linux/rtc.h>
+#include <linux/regmap.h>
 #include <linux/module.h>
 
 #include <linux/iio/iio.h>
@@ -179,7 +180,7 @@
  */
 
 struct adt7316_chip_info {
-	struct adt7316_bus	bus;
+	struct regmap		*regmap;
 	struct gpio_desc	*ldac_pin;
 	u16			int_mask;	/* 0x2f */
 	u8			config1;
@@ -240,7 +241,7 @@ static ssize_t _adt7316_store_enabled(struct adt7316_chip_info *chip,
 	else
 		config1 = chip->config1 & ~ADT7316_EN;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG1, config1);
 	if (ret)
 		return -EIO;
 
@@ -304,7 +305,7 @@ static ssize_t adt7316_store_select_ex_temp(struct device *dev,
 	if (buf[0] == '1')
 		config1 |= ADT7516_SEL_EX_TEMP;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG1, config1);
 	if (ret)
 		return -EIO;
 
@@ -345,7 +346,7 @@ static ssize_t adt7316_store_mode(struct device *dev,
 	if (!memcmp(buf, "single_channel", 14))
 		config2 |= ADT7316_AD_SINGLE_CH_MODE;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG2, config2);
 	if (ret)
 		return -EIO;
 
@@ -438,7 +439,7 @@ static ssize_t adt7316_store_ad_channel(struct device *dev,
 
 	config2 |= data;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG2, config2);
 	if (ret)
 		return -EIO;
 
@@ -498,7 +499,7 @@ static ssize_t adt7316_store_disable_averaging(struct device *dev,
 	if (buf[0] == '1')
 		config2 |= ADT7316_DISABLE_AVERAGING;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG2, config2);
 	if (ret)
 		return -EIO;
 
@@ -537,7 +538,7 @@ static ssize_t adt7316_store_enable_smbus_timeout(struct device *dev,
 	if (buf[0] == '1')
 		config2 |= ADT7316_EN_SMBUS_TIMEOUT;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG2, config2);
 	if (ret)
 		return -EIO;
 
@@ -575,7 +576,7 @@ static ssize_t adt7316_store_powerdown(struct device *dev,
 	if (buf[0] == '1')
 		config1 |= ADT7316_PD;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG1, config1);
 	if (ret)
 		return -EIO;
 
@@ -613,7 +614,7 @@ static ssize_t adt7316_store_fast_ad_clock(struct device *dev,
 	if (buf[0] == '1')
 		config3 |= ADT7316_ADCLK_22_5;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG3, config3);
 	if (ret)
 		return -EIO;
 
@@ -659,7 +660,7 @@ static ssize_t adt7316_store_da_high_resolution(struct device *dev,
 	if (buf[0] == '1')
 		config3 |= ADT7316_DA_HIGH_RESOLUTION;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG3, config3);
 	if (ret)
 		return -EIO;
 
@@ -705,7 +706,7 @@ static ssize_t adt7316_store_AIN_internal_Vref(struct device *dev,
 	else
 		config3 = chip->config3 | ADT7516_AIN_IN_VREF;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG3, config3);
 	if (ret)
 		return -EIO;
 
@@ -744,7 +745,7 @@ static ssize_t adt7316_store_enable_prop_DACA(struct device *dev,
 	if (buf[0] == '1')
 		config3 |= ADT7316_EN_IN_TEMP_PROP_DACA;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG3, config3);
 	if (ret)
 		return -EIO;
 
@@ -783,7 +784,7 @@ static ssize_t adt7316_store_enable_prop_DACB(struct device *dev,
 	if (buf[0] == '1')
 		config3 |= ADT7316_EN_EX_TEMP_PROP_DACB;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG3, config3);
 	if (ret)
 		return -EIO;
 
@@ -826,7 +827,7 @@ static ssize_t adt7316_store_DAC_2Vref_ch_mask(struct device *dev,
 	dac_config = chip->dac_config & (~ADT7316_DA_2VREF_CH_MASK);
 	dac_config |= data;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config);
+	ret = regmap_write(chip->regmap, ADT7316_DAC_CONFIG, dac_config);
 	if (ret)
 		return -EIO;
 
@@ -886,7 +887,7 @@ static ssize_t adt7316_store_DAC_update_mode(struct device *dev,
 	dac_config = chip->dac_config & (~ADT7316_DA_EN_MODE_MASK);
 	dac_config |= data << ADT7316_DA_EN_MODE_SHIFT;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config);
+	ret = regmap_write(chip->regmap, ADT7316_DAC_CONFIG, dac_config);
 	if (ret)
 		return -EIO;
 
@@ -941,8 +942,8 @@ static ssize_t adt7316_store_update_DAC(struct device *dev,
 		ldac_config = chip->ldac_config & (~ADT7316_LDAC_EN_DA_MASK);
 		ldac_config |= data;
 
-		ret = chip->bus.write(chip->bus.client, ADT7316_LDAC_CONFIG,
-			ldac_config);
+		ret = regmap_write(chip->regmap, ADT7316_LDAC_CONFIG,
+				   ldac_config);
 		if (ret)
 			return -EIO;
 	} else {
@@ -983,7 +984,7 @@ static ssize_t adt7316_store_DA_AB_Vref_bypass(struct device *dev,
 	if (buf[0] == '1')
 		dac_config |= ADT7316_VREF_BYPASS_DAC_AB;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config);
+	ret = regmap_write(chip->regmap, ADT7316_DAC_CONFIG, dac_config);
 	if (ret)
 		return -EIO;
 
@@ -1022,7 +1023,7 @@ static ssize_t adt7316_store_DA_CD_Vref_bypass(struct device *dev,
 	if (buf[0] == '1')
 		dac_config |= ADT7316_VREF_BYPASS_DAC_CD;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config);
+	ret = regmap_write(chip->regmap, ADT7316_DAC_CONFIG, dac_config);
 	if (ret)
 		return -EIO;
 
@@ -1082,8 +1083,7 @@ static ssize_t adt7316_store_DAC_internal_Vref(struct device *dev,
 			ldac_config = chip->ldac_config | ADT7316_DAC_IN_VREF;
 	}
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_LDAC_CONFIG,
-			ldac_config);
+	ret = regmap_write(chip->regmap, ADT7316_LDAC_CONFIG, ldac_config);
 	if (ret)
 		return -EIO;
 
@@ -1101,7 +1101,7 @@ static ssize_t adt7316_show_ad(struct adt7316_chip_info *chip,
 			       int channel, char *buf)
 {
 	u16 data;
-	u8 msb, lsb;
+	unsigned int msb, lsb;
 	char sign = ' ';
 	int ret;
 
@@ -1111,13 +1111,12 @@ static ssize_t adt7316_show_ad(struct adt7316_chip_info *chip,
 
 	switch (channel) {
 	case ADT7316_AD_SINGLE_CH_IN:
-		ret = chip->bus.read(chip->bus.client,
-			ADT7316_LSB_IN_TEMP_VDD, &lsb);
+		ret = regmap_read(chip->regmap, ADT7316_LSB_IN_TEMP_VDD, &lsb);
 		if (ret)
 			return -EIO;
 
-		ret = chip->bus.read(chip->bus.client,
-			ADT7316_AD_MSB_DATA_BASE + channel, &msb);
+		ret = regmap_read(chip->regmap,
+				  ADT7316_AD_MSB_DATA_BASE + channel, &msb);
 		if (ret)
 			return -EIO;
 
@@ -1125,14 +1124,12 @@ static ssize_t adt7316_show_ad(struct adt7316_chip_info *chip,
 		data |= lsb & ADT7316_LSB_IN_TEMP_MASK;
 		break;
 	case ADT7316_AD_SINGLE_CH_VDD:
-		ret = chip->bus.read(chip->bus.client,
-			ADT7316_LSB_IN_TEMP_VDD, &lsb);
+		ret = regmap_read(chip->regmap, ADT7316_LSB_IN_TEMP_VDD, &lsb);
 		if (ret)
 			return -EIO;
 
-		ret = chip->bus.read(chip->bus.client,
-
-			ADT7316_AD_MSB_DATA_BASE + channel, &msb);
+		ret = regmap_read(chip->regmap,
+				  ADT7316_AD_MSB_DATA_BASE + channel, &msb);
 		if (ret)
 			return -EIO;
 
@@ -1140,13 +1137,12 @@ static ssize_t adt7316_show_ad(struct adt7316_chip_info *chip,
 		data |= (lsb & ADT7316_LSB_VDD_MASK) >> ADT7316_LSB_VDD_OFFSET;
 		return sprintf(buf, "%d\n", data);
 	default: /* ex_temp and ain */
-		ret = chip->bus.read(chip->bus.client,
-			ADT7316_LSB_EX_TEMP_AIN, &lsb);
+		ret = regmap_read(chip->regmap, ADT7316_LSB_EX_TEMP_AIN, &lsb);
 		if (ret)
 			return -EIO;
 
-		ret = chip->bus.read(chip->bus.client,
-			ADT7316_AD_MSB_DATA_BASE + channel, &msb);
+		ret = regmap_read(chip->regmap,
+				  ADT7316_AD_MSB_DATA_BASE + channel, &msb);
 		if (ret)
 			return -EIO;
 
@@ -1246,10 +1242,10 @@ static ssize_t adt7316_show_temp_offset(struct adt7316_chip_info *chip,
 					int offset_addr, char *buf)
 {
 	int data;
-	u8 val;
+	unsigned int val;
 	int ret;
 
-	ret = chip->bus.read(chip->bus.client, offset_addr, &val);
+	ret = regmap_read(chip->regmap, offset_addr, &val);
 	if (ret)
 		return -EIO;
 
@@ -1278,7 +1274,7 @@ static ssize_t adt7316_store_temp_offset(struct adt7316_chip_info *chip,
 
 	val = (u8)data;
 
-	ret = chip->bus.write(chip->bus.client, offset_addr, val);
+	ret = regmap_write(chip->regmap, offset_addr, val);
 	if (ret)
 		return -EIO;
 
@@ -1395,7 +1391,7 @@ static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
 				int channel, char *buf)
 {
 	u16 data = 0;
-	u8 msb, lsb, offset;
+	unsigned int msb, lsb, offset;
 	int ret;
 
 	if (channel >= ADT7316_DA_MSB_DATA_REGS ||
@@ -1408,14 +1404,14 @@ static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
 	offset = chip->dac_bits - 8;
 
 	if (chip->dac_bits > 8) {
-		ret = chip->bus.read(chip->bus.client,
-			ADT7316_DA_DATA_BASE + channel * 2, &lsb);
+		ret = regmap_read(chip->regmap,
+				  ADT7316_DA_DATA_BASE + channel * 2, &lsb);
 		if (ret)
 			return -EIO;
 	}
 
-	ret = chip->bus.read(chip->bus.client,
-		ADT7316_DA_DATA_BASE + 1 + channel * 2, &msb);
+	ret = regmap_read(chip->regmap, ADT7316_DA_DATA_BASE + 1 + channel * 2,
+			  &msb);
 	if (ret)
 		return -EIO;
 
@@ -1431,7 +1427,7 @@ static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
 static ssize_t adt7316_store_DAC(struct adt7316_chip_info *chip,
 				 int channel, const char *buf, size_t len)
 {
-	u8 msb, lsb, lsb_reg, offset;
+	unsigned int msb, lsb, lsb_reg, offset;
 	u16 data;
 	int ret;
 
@@ -1454,15 +1450,15 @@ static ssize_t adt7316_store_DAC(struct adt7316_chip_info *chip,
 			lsb_reg = lsb << ADT7316_DA_12_BIT_LSB_SHIFT;
 		else
 			lsb_reg = lsb << ADT7316_DA_10_BIT_LSB_SHIFT;
-		ret = chip->bus.write(chip->bus.client,
-			ADT7316_DA_DATA_BASE + channel * 2, lsb_reg);
+		ret = regmap_write(chip->regmap,
+				   ADT7316_DA_DATA_BASE + channel * 2, lsb_reg);
 		if (ret)
 			return -EIO;
 	}
 
 	msb = data >> offset;
-	ret = chip->bus.write(chip->bus.client,
-		ADT7316_DA_DATA_BASE + 1 + channel * 2, msb);
+	ret = regmap_write(chip->regmap, ADT7316_DA_DATA_BASE + 1 + channel * 2,
+			   msb);
 	if (ret)
 		return -EIO;
 
@@ -1571,10 +1567,10 @@ static ssize_t adt7316_show_device_id(struct device *dev,
 {
 	struct iio_dev *dev_info = dev_to_iio_dev(dev);
 	struct adt7316_chip_info *chip = iio_priv(dev_info);
-	u8 id;
+	unsigned int id;
 	int ret;
 
-	ret = chip->bus.read(chip->bus.client, ADT7316_DEVICE_ID, &id);
+	ret = regmap_read(chip->regmap, ADT7316_DEVICE_ID, &id);
 	if (ret)
 		return -EIO;
 
@@ -1589,10 +1585,10 @@ static ssize_t adt7316_show_manufactorer_id(struct device *dev,
 {
 	struct iio_dev *dev_info = dev_to_iio_dev(dev);
 	struct adt7316_chip_info *chip = iio_priv(dev_info);
-	u8 id;
+	unsigned int id;
 	int ret;
 
-	ret = chip->bus.read(chip->bus.client, ADT7316_MANUFACTURE_ID, &id);
+	ret = regmap_read(chip->regmap, ADT7316_MANUFACTURE_ID, &id);
 	if (ret)
 		return -EIO;
 
@@ -1608,10 +1604,10 @@ static ssize_t adt7316_show_device_rev(struct device *dev,
 {
 	struct iio_dev *dev_info = dev_to_iio_dev(dev);
 	struct adt7316_chip_info *chip = iio_priv(dev_info);
-	u8 rev;
+	unsigned int rev;
 	int ret;
 
-	ret = chip->bus.read(chip->bus.client, ADT7316_DEVICE_REV, &rev);
+	ret = regmap_read(chip->regmap, ADT7316_DEVICE_REV, &rev);
 	if (ret)
 		return -EIO;
 
@@ -1626,10 +1622,10 @@ static ssize_t adt7316_show_bus_type(struct device *dev,
 {
 	struct iio_dev *dev_info = dev_to_iio_dev(dev);
 	struct adt7316_chip_info *chip = iio_priv(dev_info);
-	u8 stat;
+	unsigned int stat;
 	int ret;
 
-	ret = chip->bus.read(chip->bus.client, ADT7316_SPI_LOCK_STAT, &stat);
+	ret = regmap_read(chip->regmap, ADT7316_SPI_LOCK_STAT, &stat);
 	if (ret)
 		return -EIO;
 
@@ -1732,11 +1728,11 @@ static irqreturn_t adt7316_event_handler(int irq, void *private)
 {
 	struct iio_dev *indio_dev = private;
 	struct adt7316_chip_info *chip = iio_priv(indio_dev);
-	u8 stat1, stat2;
+	unsigned int stat1, stat2;
 	int ret;
 	s64 time;
 
-	ret = chip->bus.read(chip->bus.client, ADT7316_INT_STAT1, &stat1);
+	ret = regmap_read(chip->regmap, ADT7316_INT_STAT1, &stat1);
 	if (!ret) {
 		if ((chip->id & ID_FAMILY_MASK) != ID_ADT75XX)
 			stat1 &= 0x1F;
@@ -1785,7 +1781,7 @@ static irqreturn_t adt7316_event_handler(int irq, void *private)
 							    IIO_EV_DIR_EITHER),
 				       time);
 		}
-	ret = chip->bus.read(chip->bus.client, ADT7316_INT_STAT2, &stat2);
+	ret = regmap_read(chip->regmap, ADT7316_INT_STAT2, &stat2);
 	if (!ret) {
 		if (stat2 & ADT7316_INT_MASK2_VDD)
 			iio_push_event(indio_dev,
@@ -1871,7 +1867,7 @@ static ssize_t adt7316_set_int_mask(struct device *dev,
 	else
 		mask = ADT7316_INT_MASK2_VDD;	/* disable vdd int */
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_INT_MASK2, mask);
+	ret = regmap_write(chip->regmap, ADT7316_INT_MASK2, mask);
 	if (!ret) {
 		chip->int_mask &= ~ADT7316_VDD_INT_MASK;
 		chip->int_mask |= data & ADT7316_VDD_INT_MASK;
@@ -1885,7 +1881,7 @@ static ssize_t adt7316_set_int_mask(struct device *dev,
 			/* mask in reg is opposite, set 1 to disable */
 			mask = (~data) & ADT7316_TEMP_AIN_INT_MASK;
 	}
-	ret = chip->bus.write(chip->bus.client, ADT7316_INT_MASK1, mask);
+	ret = regmap_write(chip->regmap, ADT7316_INT_MASK1, mask);
 
 	chip->int_mask = mask;
 
@@ -1899,7 +1895,7 @@ static inline ssize_t adt7316_show_ad_bound(struct device *dev,
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	struct iio_dev *dev_info = dev_to_iio_dev(dev);
 	struct adt7316_chip_info *chip = iio_priv(dev_info);
-	u8 val;
+	unsigned int val;
 	int data;
 	int ret;
 
@@ -1907,7 +1903,7 @@ static inline ssize_t adt7316_show_ad_bound(struct device *dev,
 	    this_attr->address > ADT7316_EX_TEMP_LOW)
 		return -EPERM;
 
-	ret = chip->bus.read(chip->bus.client, this_attr->address, &val);
+	ret = regmap_read(chip->regmap, this_attr->address, &val);
 	if (ret)
 		return -EIO;
 
@@ -1956,7 +1952,7 @@ static inline ssize_t adt7316_set_ad_bound(struct device *dev,
 
 	val = (u8)data;
 
-	ret = chip->bus.write(chip->bus.client, this_attr->address, val);
+	ret = regmap_write(chip->regmap, this_attr->address, val);
 	if (ret)
 		return -EIO;
 
@@ -1987,7 +1983,7 @@ static ssize_t adt7316_set_int_enabled(struct device *dev,
 	if (buf[0] == '1')
 		config1 |= ADT7316_INT_EN;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG1, config1);
 	if (ret)
 		return -EIO;
 
@@ -2124,7 +2120,7 @@ static const struct iio_info adt7516_info = {
 /*
  * device probe and remove
  */
-int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
+int adt7316_probe(struct device *dev, struct regmap *regmap,
 		  const char *name, int irq)
 {
 	struct adt7316_chip_info *chip;
@@ -2138,7 +2134,7 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
 	/* this is only used for device removal purposes */
 	dev_set_drvdata(dev, indio_dev);
 
-	chip->bus = *bus;
+	chip->regmap = regmap;
 
 	if (name[4] == '3')
 		chip->id = ID_ADT7316 + (name[6] - '6');
@@ -2184,11 +2180,11 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
 			return ret;
 	}
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, chip->config1);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG1, chip->config1);
 	if (ret)
 		return -EIO;
 
-	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, chip->config3);
+	ret = regmap_write(chip->regmap, ADT7316_CONFIG3, chip->config3);
 	if (ret)
 		return -EIO;
 
diff --git a/drivers/staging/iio/addac/adt7316.h b/drivers/staging/iio/addac/adt7316.h
index e9f288420234..0162d4026e88 100644
--- a/drivers/staging/iio/addac/adt7316.h
+++ b/drivers/staging/iio/addac/adt7316.h
@@ -11,13 +11,13 @@
 
 #include <linux/types.h>
 #include <linux/pm.h>
+#include <linux/regmap.h>
 
 #define ADT7316_REG_MAX_ADDR		0x3F
 
-struct adt7316_bus {
-	void *client;
-	int (*read)(void *client, u8 reg, u8 *data);
-	int (*write)(void *client, u8 reg, u8 val);
+static const struct regmap_config adt7316_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
 };
 
 #ifdef CONFIG_PM_SLEEP
@@ -26,7 +26,7 @@ extern const struct dev_pm_ops adt7316_pm_ops;
 #else
 #define ADT7316_PM_OPS NULL
 #endif
-int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
+int adt7316_probe(struct device *dev, struct regmap *regmap,
 		  const char *name, int irq);
 
 #endif
-- 
2.17.1