iio: proximity: rfd77402: use i2c_client for rfd77402_{init,powerdown}()

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.
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210630131636.1563148-1-aardelean@deviqon.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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