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iio: accel: sca3300: modified to support multi chips
Prepare the way for multiple chips and additional channels: - Modify the driver to read the device ID and load the corresponding sensor information from the table to support multiple chips - Add prepares for the addition of extra channels - Prepare for handling the operation modes for multiple chips Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn> Reviewed-by: Tomas Melin <tomas.melin@vaisala.com> Link: https://lore.kernel.org/r/20220529061853.3044893-4-Qing-wu.Li@leica-geosystems.com.cn Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
LI Qingwu
Jonathan Cameron
parent
e59dd3aca9
commit
ad985d4d38
1 changed files with 156 additions and 41 deletions
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@ -93,19 +93,40 @@ static const struct iio_chan_spec sca3300_channels[] = {
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static const int sca3300_lp_freq[] = {70, 70, 70, 10};
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static const int sca3300_accel_scale[][2] = {{0, 370}, {0, 741}, {0, 185}, {0, 185}};
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static const int sca3300_lp_freq[] = {70, 10};
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static const int sca3300_lp_freq_map[] = {0, 0, 0, 1};
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static const int sca3300_accel_scale[][2] = {{0, 370}, {0, 741}, {0, 185}};
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static const int sca3300_accel_scale_map[] = {0, 1, 2, 2};
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static const int sca3300_avail_modes_map[] = {0, 1, 2, 3};
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static const unsigned long sca3300_scan_masks[] = {
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BIT(SCA3300_ACC_X) | BIT(SCA3300_ACC_Y) | BIT(SCA3300_ACC_Z) |
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BIT(SCA3300_TEMP),
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0
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};
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struct sca3300_chip_info {
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const char *name;
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const unsigned long *scan_masks;
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const struct iio_chan_spec *channels;
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u8 num_channels;
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u8 num_accel_scales;
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const int (*accel_scale)[2];
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const int *accel_scale_map;
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u8 num_freqs;
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const int *freq_table;
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const int *freq_map;
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const int *avail_modes_table;
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u8 num_avail_modes;
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u8 chip_id;
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};
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/**
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* struct sca3300_data - device data
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* @spi: SPI device structure
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* @lock: Data buffer lock
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* @chip: Sensor chip specific information
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* @scan: Triggered buffer. Four channel 16-bit data + 64-bit timestamp
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* @txbuf: Transmit buffer
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* @rxbuf: Receive buffer
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@ -113,6 +134,7 @@ static const unsigned long sca3300_scan_masks[] = {
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struct sca3300_data {
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struct spi_device *spi;
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struct mutex lock;
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const struct sca3300_chip_info *chip;
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struct {
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s16 channels[4];
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s64 ts __aligned(sizeof(s64));
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@ -121,6 +143,24 @@ struct sca3300_data {
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u8 rxbuf[4];
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};
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static const struct sca3300_chip_info sca3300_chip_tbl[] = {
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{
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.name = "sca3300",
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.scan_masks = sca3300_scan_masks,
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.channels = sca3300_channels,
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.num_channels = ARRAY_SIZE(sca3300_channels),
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.num_accel_scales = ARRAY_SIZE(sca3300_accel_scale)*2,
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.accel_scale = sca3300_accel_scale,
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.accel_scale_map = sca3300_accel_scale_map,
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.num_freqs = ARRAY_SIZE(sca3300_lp_freq),
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.freq_table = sca3300_lp_freq,
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.freq_map = sca3300_lp_freq_map,
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.avail_modes_table = sca3300_avail_modes_map,
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.num_avail_modes = 4,
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.chip_id = SCA3300_WHOAMI_ID,
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},
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};
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DECLARE_CRC8_TABLE(sca3300_crc_table);
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static int sca3300_transfer(struct sca3300_data *sca_data, int *val)
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@ -227,36 +267,91 @@ static int sca3300_write_reg(struct sca3300_data *sca_data, u8 reg, int val)
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return sca3300_error_handler(sca_data);
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}
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static int sca3300_set_op_mode(struct sca3300_data *sca_data, int index)
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{
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if ((index < 0) || (index >= sca_data->chip->num_avail_modes))
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return -EINVAL;
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return sca3300_write_reg(sca_data, SCA3300_REG_MODE,
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sca_data->chip->avail_modes_table[index]);
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}
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static int sca3300_get_op_mode(struct sca3300_data *sca_data, int *index)
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{
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int reg_val;
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int ret;
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int i;
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ret = sca3300_read_reg(sca_data, SCA3300_REG_MODE, ®_val);
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if (ret)
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return ret;
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for (i = 0; i < sca_data->chip->num_avail_modes; i++) {
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if (sca_data->chip->avail_modes_table[i] == reg_val)
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break;
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}
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if (i == sca_data->chip->num_avail_modes)
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return -EINVAL;
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*index = i;
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return 0;
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}
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static int sca3300_set_frequency(struct sca3300_data *data, int val)
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{
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const struct sca3300_chip_info *chip = data->chip;
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unsigned int index;
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int *opmode_scale;
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int *new_scale;
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unsigned int i;
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if (sca3300_get_op_mode(data, &index))
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return -EINVAL;
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/*
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* Find a mode in which the requested sampling frequency is available
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* and the scaling currently set is retained.
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*/
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opmode_scale = (int *)chip->accel_scale[chip->accel_scale_map[index]];
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for (i = 0; i < chip->num_avail_modes; i++) {
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new_scale = (int *)chip->accel_scale[chip->accel_scale_map[i]];
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if ((val == chip->freq_table[chip->freq_map[i]]) &&
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(opmode_scale[1] == new_scale[1]) &&
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(opmode_scale[0] == new_scale[0]))
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break;
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}
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if (i == chip->num_avail_modes)
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return -EINVAL;
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return sca3300_set_op_mode(data, i);
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}
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static int sca3300_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct sca3300_data *data = iio_priv(indio_dev);
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int reg_val;
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int ret;
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int index;
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int i;
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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if (val)
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if (chan->type != IIO_ACCEL)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(sca3300_accel_scale); i++) {
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if (val2 == sca3300_accel_scale[i][1])
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return sca3300_write_reg(data, SCA3300_REG_MODE, i);
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/*
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* Letting scale take priority over sampling frequency.
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* That makes sense given we can only ever end up increasing
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* the sampling frequency which is unlikely to be a problem.
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*/
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for (i = 0; i < data->chip->num_avail_modes; i++) {
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index = data->chip->accel_scale_map[i];
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if ((val == data->chip->accel_scale[index][0]) &&
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(val2 == data->chip->accel_scale[index][1]))
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return sca3300_set_op_mode(data, i);
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}
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return -EINVAL;
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
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ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val);
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if (ret)
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return ret;
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/* freq. change is possible only for mode 3 and 4 */
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if (reg_val == 2 && val == sca3300_lp_freq[3])
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return sca3300_write_reg(data, SCA3300_REG_MODE, 3);
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if (reg_val == 3 && val == sca3300_lp_freq[2])
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return sca3300_write_reg(data, SCA3300_REG_MODE, 2);
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return -EINVAL;
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return sca3300_set_frequency(data, val);
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default:
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return -EINVAL;
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}
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@ -267,8 +362,8 @@ static int sca3300_read_raw(struct iio_dev *indio_dev,
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int *val, int *val2, long mask)
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{
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struct sca3300_data *data = iio_priv(indio_dev);
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int index;
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int ret;
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int reg_val;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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@ -277,17 +372,24 @@ static int sca3300_read_raw(struct iio_dev *indio_dev,
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val);
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ret = sca3300_get_op_mode(data, &index);
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if (ret)
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return ret;
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*val = 0;
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*val2 = sca3300_accel_scale[reg_val][1];
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return IIO_VAL_INT_PLUS_MICRO;
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switch (chan->type) {
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case IIO_ACCEL:
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index = data->chip->accel_scale_map[index];
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*val = data->chip->accel_scale[index][0];
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*val2 = data->chip->accel_scale[index][1];
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
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ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val);
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ret = sca3300_get_op_mode(data, &index);
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if (ret)
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return ret;
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*val = sca3300_lp_freq[reg_val];
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index = data->chip->freq_map[index];
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*val = data->chip->freq_table[index];
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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@ -331,6 +433,7 @@ static int sca3300_init(struct sca3300_data *sca_data,
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{
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int value = 0;
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int ret;
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int i;
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ret = sca3300_write_reg(sca_data, SCA3300_REG_MODE,
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SCA3300_MODE_SW_RESET);
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@ -347,12 +450,17 @@ static int sca3300_init(struct sca3300_data *sca_data,
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if (ret)
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return ret;
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if (value != SCA3300_WHOAMI_ID) {
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dev_err(&sca_data->spi->dev,
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"device id not expected value, %d != %u\n",
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value, SCA3300_WHOAMI_ID);
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for (i = 0; i < ARRAY_SIZE(sca3300_chip_tbl); i++) {
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if (sca3300_chip_tbl[i].chip_id == value)
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break;
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}
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if (i == ARRAY_SIZE(sca3300_chip_tbl)) {
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dev_err(&sca_data->spi->dev, "unknown chip id %x\n", value);
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return -ENODEV;
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}
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sca_data->chip = &sca3300_chip_tbl[i];
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return 0;
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}
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@ -384,15 +492,21 @@ static int sca3300_read_avail(struct iio_dev *indio_dev,
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const int **vals, int *type, int *length,
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long mask)
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{
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struct sca3300_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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*vals = (const int *)sca3300_accel_scale;
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*length = ARRAY_SIZE(sca3300_accel_scale) * 2 - 2;
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*type = IIO_VAL_INT_PLUS_MICRO;
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return IIO_AVAIL_LIST;
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switch (chan->type) {
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case IIO_ACCEL:
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*vals = (const int *)data->chip->accel_scale;
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*length = data->chip->num_accel_scales;
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*type = IIO_VAL_INT_PLUS_MICRO;
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return IIO_AVAIL_LIST;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
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*vals = &sca3300_lp_freq[2];
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*length = 2;
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*vals = (const int *)data->chip->freq_table;
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*length = data->chip->num_freqs;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_LIST;
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default:
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@ -424,11 +538,6 @@ static int sca3300_probe(struct spi_device *spi)
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crc8_populate_msb(sca3300_crc_table, SCA3300_CRC8_POLYNOMIAL);
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indio_dev->info = &sca3300_info;
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indio_dev->name = SCA3300_ALIAS;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = sca3300_channels;
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indio_dev->num_channels = ARRAY_SIZE(sca3300_channels);
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indio_dev->available_scan_masks = sca3300_scan_masks;
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ret = sca3300_init(sca_data, indio_dev);
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if (ret) {
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@ -436,6 +545,12 @@ static int sca3300_probe(struct spi_device *spi)
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return ret;
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}
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indio_dev->name = sca_data->chip->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = sca_data->chip->channels;
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indio_dev->num_channels = sca_data->chip->num_channels;
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indio_dev->available_scan_masks = sca_data->chip->scan_masks;
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ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
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iio_pollfunc_store_time,
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sca3300_trigger_handler, NULL);
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