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SubjectRe: [PATCH] Staging: iio: adt7316: Add regmap support
+CC Jeremy who is also working with this device.

On Sun, 23 Dec 2018 19:32:24 +0530
Shreeya Patel <shreeya.patel23498@gmail.com> wrote:

> Both i2c and spi drivers have functions for reading and writing
> to/from registers. Remove this redundant and common code by using
> regmap API.
> Also remove multi_read and multi_write functions from i2c
> and spi driver as they are not being used anywhere.
>
> Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>

I would have preferred an initial patch that removed the multi_read
and multi_write first as that would (I assume) be easily separated
from the 'major' change of moving to regmap. I also suggest
another section to pull out to a precursor patch below.

The result looks fine to me.

Thanks,

Jonathan

> ---
> drivers/staging/iio/addac/adt7316-i2c.c | 101 ++--------------
> drivers/staging/iio/addac/adt7316-spi.c | 94 +++------------
> drivers/staging/iio/addac/adt7316.c | 147 ++++++++++++------------
> drivers/staging/iio/addac/adt7316.h | 15 +--
> 4 files changed, 103 insertions(+), 254 deletions(-)
>
> diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c
> index ac91163656b5..435b65845174 100644
> --- a/drivers/staging/iio/addac/adt7316-i2c.c
> +++ b/drivers/staging/iio/addac/adt7316-i2c.c
> @@ -12,105 +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)
> - return -EIO;
> -
> - 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 = 0;
> -
> - ret = i2c_smbus_write_byte_data(cl, reg, data);
> - if (ret < 0)
> - dev_err(&cl->dev, "I2C write error\n");
> -
> - return ret;
> -}
> -
> -static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
> -{
> - struct i2c_client *cl = client;
> - int i, ret = 0;
> -
> - if (count > ADT7316_REG_MAX_ADDR)
> - count = ADT7316_REG_MAX_ADDR;
> -
> - for (i = 0; i < count; i++) {
> - ret = adt7316_i2c_read(cl, reg, &data[i]);
> - if (ret < 0) {
> - dev_err(&cl->dev, "I2C multi read error\n");
> - return ret;
> - }
> - }
> -
> - return 0;
> -}
> -
> -static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
> -{
> - struct i2c_client *cl = client;
> - int i, ret = 0;
> -
> - if (count > ADT7316_REG_MAX_ADDR)
> - count = ADT7316_REG_MAX_ADDR;
> -
> - for (i = 0; i < count; i++) {
> - ret = adt7316_i2c_write(cl, reg, data[i]);
> - if (ret < 0) {
> - dev_err(&cl->dev, "I2C multi write error\n");
> - return ret;
> - }
> - }
> -
> - return 0;
> -}
> -
> /*
> * 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,
> - .irq = client->irq,
> - .read = adt7316_i2c_read,
> - .write = adt7316_i2c_write,
> - .multi_read = adt7316_i2c_multi_read,
> - .multi_write = adt7316_i2c_multi_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);
> + 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 e75827e326a6..9e3decb5cb77 100644
> --- a/drivers/staging/iio/addac/adt7316-spi.c
> +++ b/drivers/staging/iio/addac/adt7316-spi.c
> @@ -11,79 +11,12 @@
> #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_multi_read(void *client, u8 reg, u8 count, u8 *data)
> -{
> - struct spi_device *spi_dev = client;
> - u8 cmd[2];
> - int ret = 0;
> -
> - if (count > ADT7316_REG_MAX_ADDR)
> - count = ADT7316_REG_MAX_ADDR;
> -
> - 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, count);
> - if (ret < 0) {
> - dev_err(&spi_dev->dev, "SPI read data error\n");
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -static int adt7316_spi_multi_write(void *client, u8 reg, u8 count, u8 *data)
> -{
> - struct spi_device *spi_dev = client;
> - u8 buf[ADT7316_REG_MAX_ADDR + 2];
> - int i, ret = 0;
> -
> - if (count > ADT7316_REG_MAX_ADDR)
> - count = ADT7316_REG_MAX_ADDR;
> -
> - buf[0] = ADT7316_SPI_CMD_WRITE;
> - buf[1] = reg;
> - for (i = 0; i < count; i++)
> - buf[i + 2] = data[i];
> -
> - ret = spi_write(spi_dev, buf, count + 2);
> - if (ret < 0) {
> - dev_err(&spi_dev->dev, "SPI write error\n");
> - return ret;
> - }
> -
> - return ret;
> -}
> -
> -static int adt7316_spi_read(void *client, u8 reg, u8 *data)
> -{
> - return adt7316_spi_multi_read(client, reg, 1, data);
> -}
> -
> -static int adt7316_spi_write(void *client, u8 reg, u8 val)
> -{
> - return adt7316_spi_multi_write(client, reg, 1, &val);
> -}
>
> /*
> * device probe and remove
> @@ -91,14 +24,7 @@ static int adt7316_spi_write(void *client, u8 reg, u8 val)
>
> static int adt7316_spi_probe(struct spi_device *spi_dev)
> {
> - struct adt7316_bus bus = {
> - .client = spi_dev,
> - .irq = spi_dev->irq,
> - .read = adt7316_spi_read,
> - .write = adt7316_spi_write,
> - .multi_read = adt7316_spi_multi_read,
> - .multi_write = adt7316_spi_multi_write,
> - };
> + struct regmap *regmap;
>
> /* don't exceed max specified SPI CLK frequency */
> if (spi_dev->max_speed_hz > ADT7316_SPI_MAX_FREQ_HZ) {
> @@ -107,12 +33,20 @@ 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);
> }
>
> static const struct spi_device_id adt7316_spi_id[] = {
> diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
> index 1ca4ee0f30ee..be2330a42706 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>
> @@ -176,7 +177,7 @@
> */
>
> struct adt7316_chip_info {
> - struct adt7316_bus bus;
> + struct regmap *regmap;
> struct gpio_desc *ldac_pin;
> u16 int_mask; /* 0x2f */
> u8 config1;
> @@ -237,7 +238,7 @@ 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;
>
> @@ -301,7 +302,7 @@ 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;
>
> @@ -342,7 +343,7 @@ 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;
>
> @@ -435,7 +436,7 @@ 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;
>
> @@ -495,7 +496,7 @@ 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;
>
> @@ -534,7 +535,7 @@ 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;
>
> @@ -572,7 +573,7 @@ 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;
>
> @@ -610,7 +611,7 @@ 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;
>
> @@ -663,7 +664,7 @@ static ssize_t adt7316_store_da_high_resolution(struct device *dev,
> config3 = chip->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;
>
> @@ -709,7 +710,7 @@ 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;
>
> @@ -748,7 +749,7 @@ 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;
>
> @@ -787,7 +788,7 @@ 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;
>
> @@ -830,7 +831,7 @@ 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;
>
> @@ -890,7 +891,7 @@ static ssize_t adt7316_store_DAC_update_mode(struct device *dev,
> dac_config = chip->dac_config & (~ADT7316_DA_EN_MODE_MASK);
> dac_config |= data;
>
> - 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;
>
> @@ -945,8 +946,8 @@ 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 {
> @@ -993,7 +994,7 @@ 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;
>
> @@ -1038,7 +1039,7 @@ 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;
>
> @@ -1098,8 +1099,7 @@ 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;
>
> @@ -1117,7 +1117,7 @@ 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;
>
> @@ -1127,13 +1127,12 @@ 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;
>
> @@ -1141,14 +1140,12 @@ 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;
>
> @@ -1156,13 +1153,12 @@ 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;
>
> @@ -1262,10 +1258,10 @@ 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;
>
> @@ -1292,7 +1288,7 @@ 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;
>
> @@ -1409,7 +1405,7 @@ static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
> int channel, char *buf)
> {
> u16 data;
> - u8 msb, lsb, offset;
> + unsigned int msb, lsb, offset;
> int ret;
>
> if (channel >= ADT7316_DA_MSB_DATA_REGS ||
> @@ -1422,14 +1418,14 @@ 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;
>
> @@ -1460,15 +1456,15 @@ static ssize_t adt7316_store_DAC(struct adt7316_chip_info *chip,
>
> if (chip->dac_bits > 8) {
> lsb = data & (1 << offset);
> - ret = chip->bus.write(chip->bus.client,
> - ADT7316_DA_DATA_BASE + channel * 2, lsb);
> + ret = regmap_write(chip->regmap,
> + ADT7316_DA_DATA_BASE + channel * 2, lsb);
> 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;
>
> @@ -1577,10 +1573,10 @@ 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;
>
> @@ -1595,10 +1591,10 @@ 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;
>
> @@ -1614,10 +1610,10 @@ 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;
>
> @@ -1632,10 +1628,10 @@ 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;
>
> @@ -1740,11 +1736,11 @@ 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;
> @@ -1793,7 +1789,7 @@ 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,
> @@ -1807,12 +1803,12 @@ static irqreturn_t adt7316_event_handler(int irq, void *private)
> return IRQ_HANDLED;
> }
>
> -static int adt7316_setup_irq(struct iio_dev *indio_dev)
> +static int adt7316_setup_irq(struct iio_dev *indio_dev, int irq)
> {
> struct adt7316_chip_info *chip = iio_priv(indio_dev);
> int irq_type, ret;
>
> - irq_type = irqd_get_trigger_type(irq_get_irq_data(chip->bus.irq));
> + irq_type = irqd_get_trigger_type(irq_get_irq_data(irq));
>
> switch (irq_type) {
> case IRQF_TRIGGER_HIGH:
> @@ -1828,13 +1824,12 @@ static int adt7316_setup_irq(struct iio_dev *indio_dev)
> break;
> }
>
> - ret = devm_request_threaded_irq(&indio_dev->dev, chip->bus.irq,
> + ret = devm_request_threaded_irq(&indio_dev->dev, irq,
> NULL, adt7316_event_handler,
> irq_type | IRQF_ONESHOT,
> indio_dev->name, indio_dev);
> if (ret) {
> - dev_err(&indio_dev->dev, "failed to request irq %d\n",
> - chip->bus.irq);
> + dev_err(&indio_dev->dev, "failed to request irq %d\n", irq);
> return ret;
> }
>
> @@ -1880,7 +1875,7 @@ 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;
> @@ -1894,7 +1889,7 @@ 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;
>
> @@ -1908,7 +1903,7 @@ 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;
>
> @@ -1916,7 +1911,7 @@ 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;
>
> @@ -1965,7 +1960,7 @@ 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;
>
> @@ -1996,7 +1991,7 @@ 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;
>
> @@ -2133,8 +2128,8 @@ static const struct iio_info adt7516_info = {
> /*
> * device probe and remove
> */
> -int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
> - const char *name)
> +int adt7316_probe(struct device *dev, struct regmap *regmap, const char *name,
> + int irq)
> {
> struct adt7316_chip_info *chip;
> struct iio_dev *indio_dev;
> @@ -2147,7 +2142,7 @@ 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');
> @@ -2180,17 +2175,17 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
> indio_dev->name = name;
> indio_dev->modes = INDIO_DIRECT_MODE;
>
> - if (chip->bus.irq > 0) {
> - ret = adt7316_setup_irq(indio_dev);
> + if (irq > 0) {
> + ret = adt7316_setup_irq(indio_dev, irq);

This may also have been clearer as a separate patch before the regmap
one that moved to passing in irq rather than getting it from the bus
route. It is a necessary change to implement regmap but it can be
done separately before the regmap patch I think...

> if (ret)
> 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 fd7c5c92b599..2c72cf3f71cd 100644
> --- a/drivers/staging/iio/addac/adt7316.h
> +++ b/drivers/staging/iio/addac/adt7316.h
> @@ -11,16 +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 irq;
> - int (*read)(void *client, u8 reg, u8 *data);
> - int (*write)(void *client, u8 reg, u8 val);
> - int (*multi_read)(void *client, u8 first_reg, u8 count, u8 *data);
> - int (*multi_write)(void *client, u8 first_reg, u8 count, u8 *data);
> +static const struct regmap_config adt7316_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 10,
> };
>
> #ifdef CONFIG_PM_SLEEP
> @@ -29,7 +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,
> - const char *name);
> +int adt7316_probe(struct device *dev, struct regmap *regmap, const char *name,
> + int irq);
>
> #endif

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