From: Peter Meerwald Date: Thu, 19 Sep 2013 19:35:00 +0000 (+0100) Subject: staging:iio:hmc5843: Add pointer to i2c client to data struct X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8a5c19132458a0e74c09aea9ccfe061edfea0151;p=linux-beck.git staging:iio:hmc5843: Add pointer to i2c client to data struct and use it to simplify code Signed-off-by: Peter Meerwald Signed-off-by: Jonathan Cameron --- diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c index 76e0cf43197e..05f95d0795c9 100644 --- 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; }