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Message-ID: <20210703180509.1683ed4d@jic23-huawei>
Date: Sat, 3 Jul 2021 18:05:09 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Alexandru Ardelean <aardelean@...iqon.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Peter Meerwald-Stadler <pmeerw@...erw.net>
Subject: Re: [PATCH 1/2] iio: proximity: rfd77402: use i2c_client for
rfd77402_{init,powerdown}()
On Wed, 30 Jun 2021 16:16:35 +0300
Alexandru Ardelean <aardelean@...iqon.com> wrote:
> These 2 functions only do I2C reads/writes and don't require any of the
> private data of the driver.
>
> They're also used in the PM suspend/resume part of the driver.
>
> Converting them to take an i2c_client object as parameter simplifies things
> a bit (especially in the suspend/resume) as the driver mostly needs the
> reference for i2c_client, so no need to jump through hoops to get it from
> the private data (as was done in many places).
>
> The rfd77402_measure() function has also been converted to take an
> i2c_client object, since it also does only I2C ops.
Not sure I'd have bothered with this function, but it doesn't hurt
and is perhaps more consistent than leaving it alone..
>
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
+CC Peter
I'm fine with this change, but it should sit on the list a little longer
(not to mention I'm not taking anything today anyway as mid merge window!)
Jonathan
> ---
> drivers/iio/proximity/rfd77402.c | 60 ++++++++++++++------------------
> 1 file changed, 27 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/iio/proximity/rfd77402.c b/drivers/iio/proximity/rfd77402.c
> index 7a0472323f17..f349526421f3 100644
> --- a/drivers/iio/proximity/rfd77402.c
> +++ b/drivers/iio/proximity/rfd77402.c
> @@ -90,18 +90,18 @@ static const struct iio_chan_spec rfd77402_channels[] = {
> },
> };
>
> -static int rfd77402_set_state(struct rfd77402_data *data, u8 state, u16 check)
> +static int rfd77402_set_state(struct i2c_client *client, u8 state, u16 check)
> {
> int ret;
>
> - ret = i2c_smbus_write_byte_data(data->client, RFD77402_CMD_R,
> + ret = i2c_smbus_write_byte_data(client, RFD77402_CMD_R,
> state | RFD77402_CMD_VALID);
> if (ret < 0)
> return ret;
>
> usleep_range(10000, 20000);
>
> - ret = i2c_smbus_read_word_data(data->client, RFD77402_STATUS_R);
> + ret = i2c_smbus_read_word_data(client, RFD77402_STATUS_R);
> if (ret < 0)
> return ret;
> if ((ret & RFD77402_STATUS_PM_MASK) != check)
> @@ -110,24 +110,24 @@ static int rfd77402_set_state(struct rfd77402_data *data, u8 state, u16 check)
> return 0;
> }
>
> -static int rfd77402_measure(struct rfd77402_data *data)
> +static int rfd77402_measure(struct i2c_client *client)
> {
> int ret;
> int tries = 10;
>
> - ret = rfd77402_set_state(data, RFD77402_CMD_MCPU_ON,
> + ret = rfd77402_set_state(client, RFD77402_CMD_MCPU_ON,
> RFD77402_STATUS_MCPU_ON);
> if (ret < 0)
> return ret;
>
> - ret = i2c_smbus_write_byte_data(data->client, RFD77402_CMD_R,
> + ret = i2c_smbus_write_byte_data(client, RFD77402_CMD_R,
> RFD77402_CMD_SINGLE |
> RFD77402_CMD_VALID);
> if (ret < 0)
> goto err;
>
> while (tries-- > 0) {
> - ret = i2c_smbus_read_byte_data(data->client, RFD77402_ICSR);
> + ret = i2c_smbus_read_byte_data(client, RFD77402_ICSR);
> if (ret < 0)
> goto err;
> if (ret & RFD77402_ICSR_RESULT)
> @@ -140,7 +140,7 @@ static int rfd77402_measure(struct rfd77402_data *data)
> goto err;
> }
>
> - ret = i2c_smbus_read_word_data(data->client, RFD77402_RESULT_R);
> + ret = i2c_smbus_read_word_data(client, RFD77402_RESULT_R);
> if (ret < 0)
> goto err;
>
> @@ -153,7 +153,7 @@ static int rfd77402_measure(struct rfd77402_data *data)
> return (ret & RFD77402_RESULT_DIST_MASK) >> 2;
>
> err:
> - rfd77402_set_state(data, RFD77402_CMD_MCPU_OFF,
> + rfd77402_set_state(client, RFD77402_CMD_MCPU_OFF,
> RFD77402_STATUS_MCPU_OFF);
> return ret;
> }
> @@ -168,7 +168,7 @@ static int rfd77402_read_raw(struct iio_dev *indio_dev,
> switch (mask) {
> case IIO_CHAN_INFO_RAW:
> mutex_lock(&data->lock);
> - ret = rfd77402_measure(data);
> + ret = rfd77402_measure(data->client);
> mutex_unlock(&data->lock);
> if (ret < 0)
> return ret;
> @@ -188,23 +188,23 @@ static const struct iio_info rfd77402_info = {
> .read_raw = rfd77402_read_raw,
> };
>
> -static int rfd77402_init(struct rfd77402_data *data)
> +static int rfd77402_init(struct i2c_client *client)
> {
> int ret, i;
>
> - ret = rfd77402_set_state(data, RFD77402_CMD_STANDBY,
> + ret = rfd77402_set_state(client, RFD77402_CMD_STANDBY,
> RFD77402_STATUS_STANDBY);
> if (ret < 0)
> return ret;
>
> /* configure INT pad as push-pull, active low */
> - ret = i2c_smbus_write_byte_data(data->client, RFD77402_ICSR,
> + ret = i2c_smbus_write_byte_data(client, RFD77402_ICSR,
> RFD77402_ICSR_INT_MODE);
> if (ret < 0)
> return ret;
>
> /* I2C configuration */
> - ret = i2c_smbus_write_word_data(data->client, RFD77402_I2C_INIT_CFG,
> + ret = i2c_smbus_write_word_data(client, RFD77402_I2C_INIT_CFG,
> RFD77402_I2C_ADDR_INCR |
> RFD77402_I2C_DATA_INCR |
> RFD77402_I2C_HOST_DEBUG |
> @@ -213,42 +213,42 @@ static int rfd77402_init(struct rfd77402_data *data)
> return ret;
>
> /* set initialization */
> - ret = i2c_smbus_write_word_data(data->client, RFD77402_PMU_CFG, 0x0500);
> + ret = i2c_smbus_write_word_data(client, RFD77402_PMU_CFG, 0x0500);
> if (ret < 0)
> return ret;
>
> - ret = rfd77402_set_state(data, RFD77402_CMD_MCPU_OFF,
> + ret = rfd77402_set_state(client, RFD77402_CMD_MCPU_OFF,
> RFD77402_STATUS_MCPU_OFF);
> if (ret < 0)
> return ret;
>
> /* set initialization */
> - ret = i2c_smbus_write_word_data(data->client, RFD77402_PMU_CFG, 0x0600);
> + ret = i2c_smbus_write_word_data(client, RFD77402_PMU_CFG, 0x0600);
> if (ret < 0)
> return ret;
>
> - ret = rfd77402_set_state(data, RFD77402_CMD_MCPU_ON,
> + ret = rfd77402_set_state(client, RFD77402_CMD_MCPU_ON,
> RFD77402_STATUS_MCPU_ON);
> if (ret < 0)
> return ret;
>
> for (i = 0; i < ARRAY_SIZE(rf77402_tof_config); i++) {
> - ret = i2c_smbus_write_word_data(data->client,
> + ret = i2c_smbus_write_word_data(client,
> rf77402_tof_config[i].reg,
> rf77402_tof_config[i].val);
> if (ret < 0)
> return ret;
> }
>
> - ret = rfd77402_set_state(data, RFD77402_CMD_STANDBY,
> + ret = rfd77402_set_state(client, RFD77402_CMD_STANDBY,
> RFD77402_STATUS_STANDBY);
>
> return ret;
> }
>
> -static int rfd77402_powerdown(struct rfd77402_data *data)
> +static int rfd77402_powerdown(struct i2c_client *client)
> {
> - return rfd77402_set_state(data, RFD77402_CMD_STANDBY,
> + return rfd77402_set_state(client, RFD77402_CMD_STANDBY,
> RFD77402_STATUS_STANDBY);
> }
>
> @@ -280,7 +280,7 @@ static int rfd77402_probe(struct i2c_client *client,
> indio_dev->name = RFD77402_DRV_NAME;
> indio_dev->modes = INDIO_DIRECT_MODE;
>
> - ret = rfd77402_init(data);
> + ret = rfd77402_init(client);
> if (ret < 0)
> return ret;
>
> @@ -291,7 +291,7 @@ static int rfd77402_probe(struct i2c_client *client,
> return 0;
>
> err_powerdown:
> - rfd77402_powerdown(data);
> + rfd77402_powerdown(client);
> return ret;
> }
>
> @@ -300,7 +300,7 @@ static int rfd77402_remove(struct i2c_client *client)
> struct iio_dev *indio_dev = i2c_get_clientdata(client);
>
> iio_device_unregister(indio_dev);
> - rfd77402_powerdown(iio_priv(indio_dev));
> + rfd77402_powerdown(client);
>
> return 0;
> }
> @@ -308,18 +308,12 @@ static int rfd77402_remove(struct i2c_client *client)
> #ifdef CONFIG_PM_SLEEP
> static int rfd77402_suspend(struct device *dev)
> {
> - struct rfd77402_data *data = iio_priv(i2c_get_clientdata(
> - to_i2c_client(dev)));
> -
> - return rfd77402_powerdown(data);
> + return rfd77402_powerdown(to_i2c_client(dev));
> }
>
> static int rfd77402_resume(struct device *dev)
> {
> - struct rfd77402_data *data = iio_priv(i2c_get_clientdata(
> - to_i2c_client(dev)));
> -
> - return rfd77402_init(data);
> + return rfd77402_init(to_i2c_client(dev));
> }
> #endif
>
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