On Mon, Sep 24, 2018 at 12:35 AM Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote:
>
> Use regmap for i2c register access. This simplifies register accesses and
> chooses suitable access commands based on the functionality that the
> adapter supports.
>
> Cc: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
> Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Cc: Hans Verkuil <hansverk@xxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Acked-by: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
> ---
> * v2
> - Add thermistor and termperature register address definisions
>
> drivers/media/i2c/video-i2c.c | 60 ++++++++++++++++++++++++-------------------
> 1 file changed, 34 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
> index b7a2af9..fb8509e 100644
> --- a/drivers/media/i2c/video-i2c.c
> +++ b/drivers/media/i2c/video-i2c.c
> @@ -17,6 +17,7 @@
> #include <linux/module.h>
> #include <linux/mutex.h>
> #include <linux/of_device.h>
> +#include <linux/regmap.h>
> #include <linux/sched.h>
> #include <linux/slab.h>
> #include <linux/videodev2.h>
> @@ -38,7 +39,7 @@ struct video_i2c_buffer {
> };
>
> struct video_i2c_data {
> - struct i2c_client *client;
> + struct regmap *regmap;
> const struct video_i2c_chip *chip;
> struct mutex lock;
> spinlock_t slock;
> @@ -62,6 +63,12 @@ static const struct v4l2_frmsize_discrete amg88xx_size = {
> .height = 8,
> };
>
> +static const struct regmap_config amg88xx_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0xff
> +};
> +
> struct video_i2c_chip {
> /* video dimensions */
> const struct v4l2_fmtdesc *format;
> @@ -76,6 +83,8 @@ struct video_i2c_chip {
> /* pixel size in bits */
> unsigned int bpp;
>
> + const struct regmap_config *regmap_config;
> +
> /* xfer function */
> int (*xfer)(struct video_i2c_data *data, char *buf);
>
> @@ -83,26 +92,16 @@ struct video_i2c_chip {
> int (*hwmon_init)(struct video_i2c_data *data);
> };
>
> -static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
> -{
> - struct i2c_client *client = data->client;
> - struct i2c_msg msg[2];
> - u8 reg = 0x80;
> - int ret;
> -
> - msg[0].addr = client->addr;
> - msg[0].flags = 0;
> - msg[0].len = 1;
> - msg[0].buf = (char *)®
> -
> - msg[1].addr = client->addr;
> - msg[1].flags = I2C_M_RD;
> - msg[1].len = data->chip->buffer_size;
> - msg[1].buf = (char *)buf;
> +/* Thermistor register */
> +#define AMG88XX_REG_TTHL 0x0e
>
> - ret = i2c_transfer(client->adapter, msg, 2);
> +/* Temperature register */
> +#define AMG88XX_REG_T01L 0x80
>
> - return (ret == 2) ? 0 : -EIO;
> +static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
> +{
> + return regmap_bulk_read(data->regmap, AMG88XX_REG_T01L, buf,
> + data->chip->buffer_size);
> }
>
> #if IS_ENABLED(CONFIG_HWMON)
> @@ -133,12 +132,15 @@ static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
> u32 attr, int channel, long *val)
> {
> struct video_i2c_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> - int tmp = i2c_smbus_read_word_data(client, 0x0e);
> + __le16 buf;
> + int tmp;
>
> - if (tmp < 0)
> + tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2);
> + if (tmp)
> return tmp;
>
> + tmp = le16_to_cpu(buf);
> +
> /*
> * Check for sign bit, this isn't a two's complement value but an
> * absolute temperature that needs to be inverted in the case of being
> @@ -164,8 +166,9 @@ static const struct hwmon_chip_info amg88xx_chip_info = {
>
> static int amg88xx_hwmon_init(struct video_i2c_data *data)
> {
> - void *hwmon = devm_hwmon_device_register_with_info(&data->client->dev,
> - "amg88xx", data, &amg88xx_chip_info, NULL);
> + struct device *dev = regmap_get_device(data->regmap);
> + void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data,
> + &amg88xx_chip_info, NULL);
>
> return PTR_ERR_OR_ZERO(hwmon);
> }
> @@ -182,6 +185,7 @@ static const struct video_i2c_chip video_i2c_chip[] = {
> .max_fps = 10,
> .buffer_size = 128,
> .bpp = 16,
> + .regmap_config = &amg88xx_regmap_config,
> .xfer = &amg88xx_xfer,
> .hwmon_init = amg88xx_hwmon_init,
> },
> @@ -350,7 +354,8 @@ static int video_i2c_querycap(struct file *file, void *priv,
> struct v4l2_capability *vcap)
> {
> struct video_i2c_data *data = video_drvdata(file);
> - struct i2c_client *client = data->client;
> + struct device *dev = regmap_get_device(data->regmap);
> + struct i2c_client *client = to_i2c_client(dev);
>
> strlcpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
> strlcpy(vcap->card, data->vdev.name, sizeof(vcap->card));
> @@ -527,7 +532,10 @@ static int video_i2c_probe(struct i2c_client *client,
> else
> return -ENODEV;
>
> - data->client = client;
> + data->regmap = devm_regmap_init_i2c(client, data->chip->regmap_config);
> + if (IS_ERR(data->regmap))
> + return PTR_ERR(data->regmap);
> +
> v4l2_dev = &data->v4l2_dev;
> strlcpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));
>
> --
> 2.7.4
>
