staging:iio:hmc5843: Add pointer to i2c client to data struct

and use it to simplify code

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
index 76e0cf4..05f95d0 100644 (file)
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -182,6 +182,7 @@ struct hmc5843_chip_info {
 
 /* Each client has this additional data */
 struct hmc5843_data {
+       struct i2c_client *client;
        struct mutex lock;
        u8 rate;
        u8 meas_conf;
@@ -200,18 +201,15 @@ static s32 hmc5843_configure(struct i2c_client *client,
 }
 
 /* Return the measurement value from the specified channel */
-static int hmc5843_read_measurement(struct iio_dev *indio_dev,
-                                   int address,
-                                   int *val)
+static int hmc5843_read_measurement(struct hmc5843_data *data,
+                                   int address, int *val)
 {
-       struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
-       struct hmc5843_data *data = iio_priv(indio_dev);
        s32 result;
        int tries = 150;
 
        mutex_lock(&data->lock);
        while (tries-- > 0) {
-               result = i2c_smbus_read_byte_data(client,
+               result = i2c_smbus_read_byte_data(data->client,
                        HMC5843_STATUS_REG);
                if (result & HMC5843_DATA_READY)
                        break;
@@ -219,12 +217,12 @@ static int hmc5843_read_measurement(struct iio_dev *indio_dev,
        }
 
        if (tries < 0) {
-               dev_err(&client->dev, "data not ready\n");
+               dev_err(&data->client->dev, "data not ready\n");
                mutex_unlock(&data->lock);
                return -EIO;
        }
 
-       result = i2c_smbus_read_word_swapped(client, address);
+       result = i2c_smbus_read_word_swapped(data->client, address);
        mutex_unlock(&data->lock);
        if (result < 0)
                return -EINVAL;
@@ -318,15 +316,13 @@ static IIO_DEVICE_ATTR(operating_mode,
  *     and BN.
  *
  */
-static s32 hmc5843_set_meas_conf(struct i2c_client *client,
-                                     u8 meas_conf)
+static s32 hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
 {
-       struct iio_dev *indio_dev = i2c_get_clientdata(client);
-       struct hmc5843_data *data = iio_priv(indio_dev);
        u8 reg_val;
        reg_val = (meas_conf & HMC5843_MEAS_CONF_MASK) |
                (data->rate << HMC5843_RATE_OFFSET);
-       return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
+       return i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
+               reg_val);
 }
 
 static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
@@ -344,7 +340,6 @@ static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
                                                size_t count)
 {
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
        struct hmc5843_data *data = iio_priv(indio_dev);
        unsigned long meas_conf = 0;
        int error;
@@ -357,7 +352,7 @@ static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
 
        mutex_lock(&data->lock);
        dev_dbg(dev, "set measurement configuration to %lu\n", meas_conf);
-       if (hmc5843_set_meas_conf(client, meas_conf)) {
+       if (hmc5843_set_meas_conf(data, meas_conf)) {
                count = -EINVAL;
                goto exit;
        }
@@ -396,21 +391,19 @@ static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev,
 
 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_sampling_frequencies_available);
 
-static s32 hmc5843_set_rate(struct i2c_client *client,
-                               u8 rate)
+static s32 hmc5843_set_rate(struct hmc5843_data *data, u8 rate)
 {
-       struct iio_dev *indio_dev = i2c_get_clientdata(client);
-       struct hmc5843_data *data = iio_priv(indio_dev);
        u8 reg_val;
 
        if (rate >= HMC5843_RATE_NOT_USED) {
-               dev_err(&client->dev,
+               dev_err(&data->client->dev,
                        "data output rate is not supported\n");
                return -EINVAL;
        }
 
        reg_val = data->meas_conf | (rate << HMC5843_RATE_OFFSET);
-       return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
+       return i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
+               reg_val);
 }
 
 static int hmc5843_check_sampling_frequency(struct hmc5843_data *data,
@@ -433,20 +426,19 @@ static ssize_t hmc5843_set_sampling_frequency(struct device *dev,
 {
 
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
        struct hmc5843_data *data = iio_priv(indio_dev);
        int rate;
 
        rate = hmc5843_check_sampling_frequency(data, buf);
        if (rate < 0) {
-               dev_err(&client->dev,
+               dev_err(&data->client->dev,
                        "sampling frequency is not supported\n");
                return rate;
        }
 
        mutex_lock(&data->lock);
        dev_dbg(dev, "set rate to %d\n", rate);
-       if (hmc5843_set_rate(client, rate)) {
+       if (hmc5843_set_rate(data, rate)) {
                count = -EINVAL;
                goto exit;
        }
@@ -461,12 +453,11 @@ static ssize_t hmc5843_show_sampling_frequency(struct device *dev,
                        struct device_attribute *attr, char *buf)
 {
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
        struct hmc5843_data *data = iio_priv(indio_dev);
        s32 rate;
 
-       rate = i2c_smbus_read_byte_data(client, this_attr->address);
+       rate = i2c_smbus_read_byte_data(data->client, this_attr->address);
        if (rate < 0)
                return rate;
        rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET;
@@ -497,7 +488,6 @@ static ssize_t hmc5843_set_range_gain(struct device *dev,
                        size_t count)
 {
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
        struct hmc5843_data *data = iio_priv(indio_dev);
        unsigned long range = 0;
@@ -518,7 +508,7 @@ static ssize_t hmc5843_set_range_gain(struct device *dev,
 
        data->range = range;
        range = range << HMC5843_RANGE_GAIN_OFFSET;
-       if (i2c_smbus_write_byte_data(client, this_attr->address, range))
+       if (i2c_smbus_write_byte_data(data->client, this_attr->address, range))
                count = -EINVAL;
 
 exit:
@@ -541,9 +531,7 @@ static int hmc5843_read_raw(struct iio_dev *indio_dev,
 
        switch (mask) {
        case IIO_CHAN_INFO_RAW:
-               return hmc5843_read_measurement(indio_dev,
-                                               chan->address,
-                                               val);
+               return hmc5843_read_measurement(data, chan->address, val);
        case IIO_CHAN_INFO_SCALE:
                *val = 0;
                *val2 = data->variant->regval_to_nanoscale[data->range];
@@ -621,8 +609,8 @@ static void hmc5843_init_client(struct i2c_client *client,
        data->variant = &hmc5843_chip_info_tbl[id->driver_data];
        indio_dev->channels = data->variant->channels;
        indio_dev->num_channels = 3;
-       hmc5843_set_meas_conf(client, data->meas_conf);
-       hmc5843_set_rate(client, data->rate);
+       hmc5843_set_meas_conf(data, data->meas_conf);
+       hmc5843_set_rate(data, data->rate);
        hmc5843_configure(client, data->operating_mode);
        i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_B, data->range);
        mutex_init(&data->lock);
@@ -649,6 +637,7 @@ static int hmc5843_probe(struct i2c_client *client,
 
        /* default settings at probe */
        data = iio_priv(indio_dev);
+       data->client = client;
        data->meas_conf = HMC5843_MEAS_CONF_NORMAL;
        data->range = HMC5843_RANGE_GAIN_DEFAULT;
        data->operating_mode = HMC5843_MODE_CONVERSION_CONTINUOUS;
@@ -687,10 +676,10 @@ static int hmc5843_suspend(struct device *dev)
 
 static int hmc5843_resume(struct device *dev)
 {
-       struct i2c_client *client = to_i2c_client(dev);
-       struct hmc5843_data *data = iio_priv(i2c_get_clientdata(client));
+       struct hmc5843_data *data = iio_priv(i2c_get_clientdata(
+               to_i2c_client(dev)));
 
-       hmc5843_configure(client, data->operating_mode);
+       hmc5843_configure(data->client, data->operating_mode);
 
        return 0;
 }