staging: iio: cleanup and move comments in hmc5843
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>hifive-unleashed-5.1
Peter Meerwald
Greg Kroah-Hartman
parent
e278df1c82
commit
c7c34af049
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@ -103,6 +103,18 @@ static const int hmc5843_regval_to_nanoscale[] = {
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6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
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};
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/*
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* From the datasheet:
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* Value | Sensor input field range (Ga) | Gain (counts/milli-Gauss)
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* 0 | (+-)0.7 | 1620
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* 1 | (+-)1.0 | 1300
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* 2 | (+-)1.5 | 970
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* 3 | (+-)2.0 | 780
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* 4 | (+-)3.2 | 530
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* 5 | (+-)3.8 | 460
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* 6 | (+-)4.5 | 390
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* 7 | (+-)6.5 | 280
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*/
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static const int regval_to_input_field_mg[] = {
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700,
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1000,
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@ -113,6 +125,19 @@ static const int regval_to_input_field_mg[] = {
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4500,
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6500
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};
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/*
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* From the datasheet:
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* Value | Data output rate (Hz)
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* 0 | 0.5
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* 1 | 1
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* 2 | 2
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* 3 | 5
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* 4 | 10 (default)
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* 5 | 20
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* 6 | 50
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* 7 | Not used
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*/
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static const char * const regval_to_samp_freq[] = {
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"0.5",
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"1",
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@ -130,18 +155,16 @@ static const unsigned short normal_i2c[] = { HMC5843_I2C_ADDRESS,
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/* Each client has this additional data */
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struct hmc5843_data {
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struct mutex lock;
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u8 rate;
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u8 meas_conf;
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u8 operating_mode;
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u8 range;
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u8 rate;
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u8 meas_conf;
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u8 operating_mode;
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u8 range;
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};
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static void hmc5843_init_client(struct i2c_client *client);
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/* The lower two bits contain the current conversion mode */
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static s32 hmc5843_configure(struct i2c_client *client,
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u8 operating_mode)
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{
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/* The lower two bits contain the current conversion mode */
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return i2c_smbus_write_byte_data(client,
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HMC5843_MODE_REG,
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operating_mode & HMC5843_MODE_MASK);
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@ -166,23 +189,22 @@ static int hmc5843_read_measurement(struct iio_dev *indio_dev,
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if (result < 0)
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return -EINVAL;
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*val = (s16)swab16((u16)result);
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*val = (s16)swab16((u16)result);
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return IIO_VAL_INT;
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}
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/*
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* From the datasheet
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* From the datasheet:
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* 0 - Continuous-Conversion Mode: In continuous-conversion mode, the
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* device continuously performs conversions and places the result in the
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* data register.
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* device continuously performs conversions and places the result in
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* the data register.
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*
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* 1 - Single-Conversion Mode : device performs a single measurement,
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* sets RDY high and returned to sleep mode
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* 1 - Single-Conversion Mode : Device performs a single measurement,
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* sets RDY high and returns to sleep mode.
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*
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* 2 - Idle Mode : Device is placed in idle mode.
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* 2 - Idle Mode : Device is placed in idle mode.
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*
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* 3 - Sleep Mode. Device is placed in sleep mode.
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* 3 - Sleep Mode : Device is placed in sleep mode.
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*
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*/
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static ssize_t hmc5843_show_operating_mode(struct device *dev,
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@ -206,13 +228,14 @@ static ssize_t hmc5843_set_operating_mode(struct device *dev,
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unsigned long operating_mode = 0;
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s32 status;
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int error;
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mutex_lock(&data->lock);
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error = kstrtoul(buf, 10, &operating_mode);
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if (error) {
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count = error;
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goto exit;
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}
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dev_dbg(dev, "set Conversion mode to %lu\n", operating_mode);
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dev_dbg(dev, "set conversion mode to %lu\n", operating_mode);
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if (operating_mode > HMC5843_MODE_SLEEP) {
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count = -EINVAL;
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goto exit;
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@ -230,6 +253,7 @@ exit:
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mutex_unlock(&data->lock);
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return count;
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}
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static IIO_DEVICE_ATTR(operating_mode,
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S_IWUSR | S_IRUGO,
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hmc5843_show_operating_mode,
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@ -239,17 +263,19 @@ static IIO_DEVICE_ATTR(operating_mode,
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/*
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* API for setting the measurement configuration to
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* Normal, Positive bias and Negative bias
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* From the datasheet
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*
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* Normal measurement configuration (default): In normal measurement
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* configuration the device follows normal measurement flow. Pins BP and BN
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* are left floating and high impedance.
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* From the datasheet:
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* 0 - Normal measurement configuration (default): In normal measurement
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* configuration the device follows normal measurement flow. Pins BP
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* and BN are left floating and high impedance.
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*
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* Positive bias configuration: In positive bias configuration, a positive
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* current is forced across the resistive load on pins BP and BN.
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* 1 - Positive bias configuration: In positive bias configuration, a
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* positive current is forced across the resistive load on pins BP
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* and BN.
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*
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* Negative bias configuration. In negative bias configuration, a negative
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* current is forced across the resistive load on pins BP and BN.
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* 2 - Negative bias configuration. In negative bias configuration, a
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* negative current is forced across the resistive load on pins BP
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* and BN.
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*
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*/
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static s32 hmc5843_set_meas_conf(struct i2c_client *client,
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@ -290,8 +316,7 @@ static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
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return -EINVAL;
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mutex_lock(&data->lock);
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dev_dbg(dev, "set mode to %lu\n", meas_conf);
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dev_dbg(dev, "set measurement configuration to %lu\n", meas_conf);
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if (hmc5843_set_meas_conf(client, meas_conf)) {
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count = -EINVAL;
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goto exit;
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@ -302,25 +327,13 @@ exit:
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mutex_unlock(&data->lock);
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return count;
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}
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static IIO_DEVICE_ATTR(meas_conf,
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S_IWUSR | S_IRUGO,
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hmc5843_show_measurement_configuration,
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hmc5843_set_measurement_configuration,
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0);
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/*
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* From Datasheet
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* The table shows the minimum data output
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* Value | Minimum data output rate(Hz)
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* 0 | 0.5
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* 1 | 1
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* 2 | 2
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* 3 | 5
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* 4 | 10 (default)
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* 5 | 20
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* 6 | 50
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* 7 | Not used
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*/
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("0.5 1 2 5 10 20 50");
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static s32 hmc5843_set_rate(struct i2c_client *client,
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@ -333,7 +346,7 @@ static s32 hmc5843_set_rate(struct i2c_client *client,
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reg_val = (data->meas_conf) | (rate << HMC5843_RATE_OFFSET);
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if (rate >= HMC5843_RATE_NOT_USED) {
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dev_err(&client->dev,
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"This data output rate is not supported\n");
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"data output rate is not supported\n");
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return -EINVAL;
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}
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return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
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@ -392,31 +405,19 @@ static ssize_t show_sampling_frequency(struct device *dev,
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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s32 rate;
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rate = i2c_smbus_read_byte_data(client, this_attr->address);
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rate = i2c_smbus_read_byte_data(client, this_attr->address);
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if (rate < 0)
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return rate;
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rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET;
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return sprintf(buf, "%s\n", regval_to_samp_freq[rate]);
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}
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static IIO_DEVICE_ATTR(sampling_frequency,
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S_IWUSR | S_IRUGO,
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show_sampling_frequency,
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set_sampling_frequency,
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HMC5843_CONFIG_REG_A);
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/*
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* From Datasheet
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* Nominal gain settings
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* Value | Sensor Input Field Range(Ga) | Gain(counts/ milli-gauss)
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*0 |(+-)0.7 |1620
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*1 |(+-)1.0 |1300
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*2 |(+-)1.5 |970
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*3 |(+-)2.0 |780
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*4 |(+-)3.2 |530
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*5 |(+-)3.8 |460
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*6 |(+-)4.5 |390
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*7 |(+-)6.5 |280
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*/
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static ssize_t show_range(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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@ -440,6 +441,7 @@ static ssize_t set_range(struct device *dev,
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struct hmc5843_data *data = iio_priv(indio_dev);
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unsigned long range = 0;
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int error;
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mutex_lock(&data->lock);
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error = kstrtoul(buf, 10, &range);
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if (error) {
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@ -461,8 +463,8 @@ static ssize_t set_range(struct device *dev,
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exit:
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mutex_unlock(&data->lock);
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return count;
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}
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static IIO_DEVICE_ATTR(in_magn_range,
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S_IWUSR | S_IRUGO,
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show_range,
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@ -537,7 +539,7 @@ static int hmc5843_detect(struct i2c_client *client,
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return 0;
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}
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/* Called when we have found a new HMC5843. */
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/* Called when we have found a new HMC5843 */
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static void hmc5843_init_client(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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@ -548,6 +550,7 @@ static void hmc5843_init_client(struct i2c_client *client)
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hmc5843_configure(client, data->operating_mode);
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i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_B, data->range);
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mutex_init(&data->lock);
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pr_info("HMC5843 initialized\n");
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}
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@ -577,8 +580,6 @@ static int hmc5843_probe(struct i2c_client *client,
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data->operating_mode = HMC5843_MODE_CONVERSION_CONTINUOUS;
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i2c_set_clientdata(client, indio_dev);
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/* Initialize the HMC5843 chip */
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hmc5843_init_client(client);
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indio_dev->info = &hmc5843_info;
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@ -587,10 +588,13 @@ static int hmc5843_probe(struct i2c_client *client,
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indio_dev->num_channels = ARRAY_SIZE(hmc5843_channels);
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indio_dev->dev.parent = &client->dev;
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indio_dev->modes = INDIO_DIRECT_MODE;
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err = iio_device_register(indio_dev);
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if (err)
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goto exit_free2;
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return 0;
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exit_free2:
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iio_device_free(indio_dev);
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exit:
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