From ad985d4d38d7ad8a83b0ff428ea51a2f41ce12e1 Mon Sep 17 00:00:00 2001 From: LI Qingwu Date: Sun, 29 May 2022 06:18:51 +0000 Subject: [PATCH] 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 Reviewed-by: Tomas Melin Link: https://lore.kernel.org/r/20220529061853.3044893-4-Qing-wu.Li@leica-geosystems.com.cn Signed-off-by: Jonathan Cameron --- drivers/iio/accel/sca3300.c | 197 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 156 insertions(+), 41 deletions(-) diff --git a/drivers/iio/accel/sca3300.c b/drivers/iio/accel/sca3300.c index ff16d2c..21bf439 100644 --- a/drivers/iio/accel/sca3300.c +++ b/drivers/iio/accel/sca3300.c @@ -93,19 +93,40 @@ static const struct iio_chan_spec sca3300_channels[] = { IIO_CHAN_SOFT_TIMESTAMP(4), }; -static const int sca3300_lp_freq[] = {70, 70, 70, 10}; -static const int sca3300_accel_scale[][2] = {{0, 370}, {0, 741}, {0, 185}, {0, 185}}; +static const int sca3300_lp_freq[] = {70, 10}; +static const int sca3300_lp_freq_map[] = {0, 0, 0, 1}; +static const int sca3300_accel_scale[][2] = {{0, 370}, {0, 741}, {0, 185}}; +static const int sca3300_accel_scale_map[] = {0, 1, 2, 2}; + +static const int sca3300_avail_modes_map[] = {0, 1, 2, 3}; static const unsigned long sca3300_scan_masks[] = { BIT(SCA3300_ACC_X) | BIT(SCA3300_ACC_Y) | BIT(SCA3300_ACC_Z) | BIT(SCA3300_TEMP), 0 }; +struct sca3300_chip_info { + const char *name; + const unsigned long *scan_masks; + const struct iio_chan_spec *channels; + u8 num_channels; + u8 num_accel_scales; + const int (*accel_scale)[2]; + const int *accel_scale_map; + u8 num_freqs; + const int *freq_table; + const int *freq_map; + const int *avail_modes_table; + u8 num_avail_modes; + u8 chip_id; +}; + /** * struct sca3300_data - device data * @spi: SPI device structure * @lock: Data buffer lock + * @chip: Sensor chip specific information * @scan: Triggered buffer. Four channel 16-bit data + 64-bit timestamp * @txbuf: Transmit buffer * @rxbuf: Receive buffer @@ -113,6 +134,7 @@ static const unsigned long sca3300_scan_masks[] = { struct sca3300_data { struct spi_device *spi; struct mutex lock; + const struct sca3300_chip_info *chip; struct { s16 channels[4]; s64 ts __aligned(sizeof(s64)); @@ -121,6 +143,24 @@ struct sca3300_data { u8 rxbuf[4]; }; +static const struct sca3300_chip_info sca3300_chip_tbl[] = { + { + .name = "sca3300", + .scan_masks = sca3300_scan_masks, + .channels = sca3300_channels, + .num_channels = ARRAY_SIZE(sca3300_channels), + .num_accel_scales = ARRAY_SIZE(sca3300_accel_scale)*2, + .accel_scale = sca3300_accel_scale, + .accel_scale_map = sca3300_accel_scale_map, + .num_freqs = ARRAY_SIZE(sca3300_lp_freq), + .freq_table = sca3300_lp_freq, + .freq_map = sca3300_lp_freq_map, + .avail_modes_table = sca3300_avail_modes_map, + .num_avail_modes = 4, + .chip_id = SCA3300_WHOAMI_ID, + }, +}; + DECLARE_CRC8_TABLE(sca3300_crc_table); static int sca3300_transfer(struct sca3300_data *sca_data, int *val) @@ -227,36 +267,91 @@ static int sca3300_write_reg(struct sca3300_data *sca_data, u8 reg, int val) return sca3300_error_handler(sca_data); } +static int sca3300_set_op_mode(struct sca3300_data *sca_data, int index) +{ + if ((index < 0) || (index >= sca_data->chip->num_avail_modes)) + return -EINVAL; + + return sca3300_write_reg(sca_data, SCA3300_REG_MODE, + sca_data->chip->avail_modes_table[index]); +} + +static int sca3300_get_op_mode(struct sca3300_data *sca_data, int *index) +{ + int reg_val; + int ret; + int i; + + ret = sca3300_read_reg(sca_data, SCA3300_REG_MODE, ®_val); + if (ret) + return ret; + + for (i = 0; i < sca_data->chip->num_avail_modes; i++) { + if (sca_data->chip->avail_modes_table[i] == reg_val) + break; + } + if (i == sca_data->chip->num_avail_modes) + return -EINVAL; + + *index = i; + return 0; +} + +static int sca3300_set_frequency(struct sca3300_data *data, int val) +{ + const struct sca3300_chip_info *chip = data->chip; + unsigned int index; + int *opmode_scale; + int *new_scale; + unsigned int i; + + if (sca3300_get_op_mode(data, &index)) + return -EINVAL; + + /* + * Find a mode in which the requested sampling frequency is available + * and the scaling currently set is retained. + */ + opmode_scale = (int *)chip->accel_scale[chip->accel_scale_map[index]]; + for (i = 0; i < chip->num_avail_modes; i++) { + new_scale = (int *)chip->accel_scale[chip->accel_scale_map[i]]; + if ((val == chip->freq_table[chip->freq_map[i]]) && + (opmode_scale[1] == new_scale[1]) && + (opmode_scale[0] == new_scale[0])) + break; + } + if (i == chip->num_avail_modes) + return -EINVAL; + + return sca3300_set_op_mode(data, i); +} + static int sca3300_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct sca3300_data *data = iio_priv(indio_dev); - int reg_val; - int ret; + int index; int i; switch (mask) { case IIO_CHAN_INFO_SCALE: - if (val) + if (chan->type != IIO_ACCEL) return -EINVAL; - - for (i = 0; i < ARRAY_SIZE(sca3300_accel_scale); i++) { - if (val2 == sca3300_accel_scale[i][1]) - return sca3300_write_reg(data, SCA3300_REG_MODE, i); + /* + * Letting scale take priority over sampling frequency. + * That makes sense given we can only ever end up increasing + * the sampling frequency which is unlikely to be a problem. + */ + for (i = 0; i < data->chip->num_avail_modes; i++) { + index = data->chip->accel_scale_map[i]; + if ((val == data->chip->accel_scale[index][0]) && + (val2 == data->chip->accel_scale[index][1])) + return sca3300_set_op_mode(data, i); } return -EINVAL; - case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: - ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); - if (ret) - return ret; - /* freq. change is possible only for mode 3 and 4 */ - if (reg_val == 2 && val == sca3300_lp_freq[3]) - return sca3300_write_reg(data, SCA3300_REG_MODE, 3); - if (reg_val == 3 && val == sca3300_lp_freq[2]) - return sca3300_write_reg(data, SCA3300_REG_MODE, 2); - return -EINVAL; + return sca3300_set_frequency(data, val); default: return -EINVAL; } @@ -267,8 +362,8 @@ static int sca3300_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long mask) { struct sca3300_data *data = iio_priv(indio_dev); + int index; int ret; - int reg_val; switch (mask) { case IIO_CHAN_INFO_RAW: @@ -277,17 +372,24 @@ static int sca3300_read_raw(struct iio_dev *indio_dev, return ret; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: - ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); + ret = sca3300_get_op_mode(data, &index); if (ret) return ret; - *val = 0; - *val2 = sca3300_accel_scale[reg_val][1]; - return IIO_VAL_INT_PLUS_MICRO; + switch (chan->type) { + case IIO_ACCEL: + index = data->chip->accel_scale_map[index]; + *val = data->chip->accel_scale[index][0]; + *val2 = data->chip->accel_scale[index][1]; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: - ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); + ret = sca3300_get_op_mode(data, &index); if (ret) return ret; - *val = sca3300_lp_freq[reg_val]; + index = data->chip->freq_map[index]; + *val = data->chip->freq_table[index]; return IIO_VAL_INT; default: return -EINVAL; @@ -331,6 +433,7 @@ static int sca3300_init(struct sca3300_data *sca_data, { int value = 0; int ret; + int i; ret = sca3300_write_reg(sca_data, SCA3300_REG_MODE, SCA3300_MODE_SW_RESET); @@ -347,12 +450,17 @@ static int sca3300_init(struct sca3300_data *sca_data, if (ret) return ret; - if (value != SCA3300_WHOAMI_ID) { - dev_err(&sca_data->spi->dev, - "device id not expected value, %d != %u\n", - value, SCA3300_WHOAMI_ID); + for (i = 0; i < ARRAY_SIZE(sca3300_chip_tbl); i++) { + if (sca3300_chip_tbl[i].chip_id == value) + break; + } + if (i == ARRAY_SIZE(sca3300_chip_tbl)) { + dev_err(&sca_data->spi->dev, "unknown chip id %x\n", value); return -ENODEV; } + + sca_data->chip = &sca3300_chip_tbl[i]; + return 0; } @@ -384,15 +492,21 @@ static int sca3300_read_avail(struct iio_dev *indio_dev, const int **vals, int *type, int *length, long mask) { + struct sca3300_data *data = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_SCALE: - *vals = (const int *)sca3300_accel_scale; - *length = ARRAY_SIZE(sca3300_accel_scale) * 2 - 2; - *type = IIO_VAL_INT_PLUS_MICRO; - return IIO_AVAIL_LIST; + switch (chan->type) { + case IIO_ACCEL: + *vals = (const int *)data->chip->accel_scale; + *length = data->chip->num_accel_scales; + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: - *vals = &sca3300_lp_freq[2]; - *length = 2; + *vals = (const int *)data->chip->freq_table; + *length = data->chip->num_freqs; *type = IIO_VAL_INT; return IIO_AVAIL_LIST; default: @@ -424,11 +538,6 @@ static int sca3300_probe(struct spi_device *spi) crc8_populate_msb(sca3300_crc_table, SCA3300_CRC8_POLYNOMIAL); indio_dev->info = &sca3300_info; - indio_dev->name = SCA3300_ALIAS; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = sca3300_channels; - indio_dev->num_channels = ARRAY_SIZE(sca3300_channels); - indio_dev->available_scan_masks = sca3300_scan_masks; ret = sca3300_init(sca_data, indio_dev); if (ret) { @@ -436,6 +545,12 @@ static int sca3300_probe(struct spi_device *spi) return ret; } + indio_dev->name = sca_data->chip->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = sca_data->chip->channels; + indio_dev->num_channels = sca_data->chip->num_channels; + indio_dev->available_scan_masks = sca_data->chip->scan_masks; + ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, iio_pollfunc_store_time, sca3300_trigger_handler, NULL); -- 2.7.4