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Date: Sun, 29 May 2022 06:18:51 +0000
From: LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
To: jic23@...nel.org, lars@...afoo.de, robh+dt@...nel.org,
tomas.melin@...sala.com, andy.shevchenko@...il.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Qing-wu.Li@...ca-geosystems.com.cn,
thomas.haemmerle@...ca-geosystems.com
Cc: linux-iio@...r.kernel.org
Subject: [PATCH V9 3/5] 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@...ca-geosystems.com.cn>
---
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 ff16d2cc8c70..21bf439e5c84 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);
--
2.25.1
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