diff options
Diffstat (limited to 'drivers/iio/pressure/st_pressure_core.c')
-rw-r--r-- | drivers/iio/pressure/st_pressure_core.c | 798 |
1 files changed, 798 insertions, 0 deletions
diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c new file mode 100644 index 0000000000..80176e3083 --- /dev/null +++ b/drivers/iio/pressure/st_pressure_core.c @@ -0,0 +1,798 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/sysfs.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> +#include <asm/unaligned.h> + +#include <linux/iio/common/st_sensors.h> +#include "st_pressure.h" + +/* + * About determining pressure scaling factors + * ------------------------------------------ + * + * Datasheets specify typical pressure sensitivity so that pressure is computed + * according to the following equation : + * pressure[mBar] = raw / sensitivity + * where : + * raw the 24 bits long raw sampled pressure + * sensitivity a scaling factor specified by the datasheet in LSB/mBar + * + * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be + * computed according to : + * pressure[kPascal] = pressure[mBar] / 10 + * = raw / (sensitivity * 10) (1) + * + * Finally, st_press_read_raw() returns pressure scaling factor as an + * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part. + * Therefore, from (1), "gain" becomes : + * gain = 10^9 / (sensitivity * 10) + * = 10^8 / sensitivity + * + * About determining temperature scaling factors and offsets + * --------------------------------------------------------- + * + * Datasheets specify typical temperature sensitivity and offset so that + * temperature is computed according to the following equation : + * temp[Celsius] = offset[Celsius] + (raw / sensitivity) + * where : + * raw the 16 bits long raw sampled temperature + * offset a constant specified by the datasheet in degree Celsius + * (sometimes zero) + * sensitivity a scaling factor specified by the datasheet in LSB/Celsius + * + * IIO ABI expects temperature to be expressed as milli degree Celsius such as + * user space should compute temperature according to : + * temp[mCelsius] = temp[Celsius] * 10^3 + * = (offset[Celsius] + (raw / sensitivity)) * 10^3 + * = ((offset[Celsius] * sensitivity) + raw) * + * (10^3 / sensitivity) (2) + * + * IIO ABI expects user space to apply offset and scaling factors to raw samples + * according to : + * temp[mCelsius] = (OFFSET + raw) * SCALE + * where : + * OFFSET an arbitrary constant exposed by device + * SCALE an arbitrary scaling factor exposed by device + * + * Matching OFFSET and SCALE with members of (2) gives : + * OFFSET = offset[Celsius] * sensitivity (3) + * SCALE = 10^3 / sensitivity (4) + * + * st_press_read_raw() returns temperature scaling factor as an + * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator. + * Therefore, from (3), "gain2" becomes : + * gain2 = sensitivity + * + * When declared within channel, i.e. for a non zero specified offset, + * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as : + * numerator = OFFSET * 10^3 + * denominator = 10^3 + * giving from (4): + * numerator = offset[Celsius] * 10^3 * sensitivity + * = offset[mCelsius] * gain2 + */ + +#define MCELSIUS_PER_CELSIUS 1000 + +/* Default pressure sensitivity */ +#define ST_PRESS_LSB_PER_MBAR 4096UL +#define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \ + ST_PRESS_LSB_PER_MBAR) + +/* Default temperature sensitivity */ +#define ST_PRESS_LSB_PER_CELSIUS 480UL +#define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL + +/* FULLSCALE */ +#define ST_PRESS_FS_AVL_1100MB 1100 +#define ST_PRESS_FS_AVL_1260MB 1260 + +#define ST_PRESS_1_OUT_XL_ADDR 0x28 +#define ST_TEMP_1_OUT_L_ADDR 0x2b + +/* LPS001WP pressure resolution */ +#define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL +/* LPS001WP temperature resolution */ +#define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL +/* LPS001WP pressure gain */ +#define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \ + (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR) +/* LPS001WP pressure and temp L addresses */ +#define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28 +#define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a + +/* LPS25H pressure and temp L addresses */ +#define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28 +#define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b + +/* LPS22HB temperature sensitivity */ +#define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL + +static const struct iio_chan_spec st_press_1_channels[] = { + { + .type = IIO_PRESSURE, + .address = ST_PRESS_1_OUT_XL_ADDR, + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 24, + .storagebits = 32, + .endianness = IIO_LE, + }, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + }, + { + .type = IIO_TEMP, + .address = ST_TEMP_1_OUT_L_ADDR, + .scan_index = 1, + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_LE, + }, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + }, + IIO_CHAN_SOFT_TIMESTAMP(2) +}; + +static const struct iio_chan_spec st_press_lps001wp_channels[] = { + { + .type = IIO_PRESSURE, + .address = ST_PRESS_LPS001WP_OUT_L_ADDR, + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_LE, + }, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + }, + { + .type = IIO_TEMP, + .address = ST_TEMP_LPS001WP_OUT_L_ADDR, + .scan_index = 1, + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_LE, + }, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + }, + IIO_CHAN_SOFT_TIMESTAMP(2) +}; + +static const struct iio_chan_spec st_press_lps22hb_channels[] = { + { + .type = IIO_PRESSURE, + .address = ST_PRESS_1_OUT_XL_ADDR, + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 24, + .storagebits = 32, + .endianness = IIO_LE, + }, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + }, + { + .type = IIO_TEMP, + .address = ST_TEMP_1_OUT_L_ADDR, + .scan_index = 1, + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_LE, + }, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + }, + IIO_CHAN_SOFT_TIMESTAMP(2) +}; + +static const struct st_sensor_settings st_press_sensors_settings[] = { + { + /* + * CUSTOM VALUES FOR LPS331AP SENSOR + * See LPS331AP datasheet: + * http://www2.st.com/resource/en/datasheet/lps331ap.pdf + */ + .wai = 0xbb, + .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, + .sensors_supported = { + [0] = LPS331AP_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_1_channels, + .num_ch = ARRAY_SIZE(st_press_1_channels), + .odr = { + .addr = 0x20, + .mask = 0x70, + .odr_avl = { + { .hz = 1, .value = 0x01 }, + { .hz = 7, .value = 0x05 }, + { .hz = 13, .value = 0x06 }, + { .hz = 25, .value = 0x07 }, + }, + }, + .pw = { + .addr = 0x20, + .mask = 0x80, + .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .addr = 0x23, + .mask = 0x30, + .fs_avl = { + /* + * Pressure and temperature sensitivity values + * as defined in table 3 of LPS331AP datasheet. + */ + [0] = { + .num = ST_PRESS_FS_AVL_1260MB, + .gain = ST_PRESS_KPASCAL_NANO_SCALE, + .gain2 = ST_PRESS_LSB_PER_CELSIUS, + }, + }, + }, + .bdu = { + .addr = 0x20, + .mask = 0x04, + }, + .drdy_irq = { + .int1 = { + .addr = 0x22, + .mask = 0x04, + .addr_od = 0x22, + .mask_od = 0x40, + }, + .int2 = { + .addr = 0x22, + .mask = 0x20, + .addr_od = 0x22, + .mask_od = 0x40, + }, + .addr_ihl = 0x22, + .mask_ihl = 0x80, + .stat_drdy = { + .addr = ST_SENSORS_DEFAULT_STAT_ADDR, + .mask = 0x03, + }, + }, + .sim = { + .addr = 0x20, + .value = BIT(0), + }, + .multi_read_bit = true, + .bootime = 2, + }, + { + /* + * CUSTOM VALUES FOR LPS001WP SENSOR + */ + .wai = 0xba, + .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, + .sensors_supported = { + [0] = LPS001WP_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_lps001wp_channels, + .num_ch = ARRAY_SIZE(st_press_lps001wp_channels), + .odr = { + .addr = 0x20, + .mask = 0x30, + .odr_avl = { + { .hz = 1, .value = 0x01 }, + { .hz = 7, .value = 0x02 }, + { .hz = 13, .value = 0x03 }, + }, + }, + .pw = { + .addr = 0x20, + .mask = 0x40, + .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .fs_avl = { + /* + * Pressure and temperature resolution values + * as defined in table 3 of LPS001WP datasheet. + */ + [0] = { + .num = ST_PRESS_FS_AVL_1100MB, + .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN, + .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS, + }, + }, + }, + .bdu = { + .addr = 0x20, + .mask = 0x04, + }, + .sim = { + .addr = 0x20, + .value = BIT(0), + }, + .multi_read_bit = true, + .bootime = 2, + }, + { + /* + * CUSTOM VALUES FOR LPS25H SENSOR + * See LPS25H datasheet: + * http://www2.st.com/resource/en/datasheet/lps25h.pdf + */ + .wai = 0xbd, + .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, + .sensors_supported = { + [0] = LPS25H_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_1_channels, + .num_ch = ARRAY_SIZE(st_press_1_channels), + .odr = { + .addr = 0x20, + .mask = 0x70, + .odr_avl = { + { .hz = 1, .value = 0x01 }, + { .hz = 7, .value = 0x02 }, + { .hz = 13, .value = 0x03 }, + { .hz = 25, .value = 0x04 }, + }, + }, + .pw = { + .addr = 0x20, + .mask = 0x80, + .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .fs_avl = { + /* + * Pressure and temperature sensitivity values + * as defined in table 3 of LPS25H datasheet. + */ + [0] = { + .num = ST_PRESS_FS_AVL_1260MB, + .gain = ST_PRESS_KPASCAL_NANO_SCALE, + .gain2 = ST_PRESS_LSB_PER_CELSIUS, + }, + }, + }, + .bdu = { + .addr = 0x20, + .mask = 0x04, + }, + .drdy_irq = { + .int1 = { + .addr = 0x23, + .mask = 0x01, + .addr_od = 0x22, + .mask_od = 0x40, + }, + .addr_ihl = 0x22, + .mask_ihl = 0x80, + .stat_drdy = { + .addr = ST_SENSORS_DEFAULT_STAT_ADDR, + .mask = 0x03, + }, + }, + .sim = { + .addr = 0x20, + .value = BIT(0), + }, + .multi_read_bit = true, + .bootime = 2, + }, + { + /* + * CUSTOM VALUES FOR LPS22HB SENSOR + * See LPS22HB datasheet: + * http://www2.st.com/resource/en/datasheet/lps22hb.pdf + */ + .wai = 0xb1, + .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, + .sensors_supported = { + [0] = LPS22HB_PRESS_DEV_NAME, + [1] = LPS33HW_PRESS_DEV_NAME, + [2] = LPS35HW_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_lps22hb_channels, + .num_ch = ARRAY_SIZE(st_press_lps22hb_channels), + .odr = { + .addr = 0x10, + .mask = 0x70, + .odr_avl = { + { .hz = 1, .value = 0x01 }, + { .hz = 10, .value = 0x02 }, + { .hz = 25, .value = 0x03 }, + { .hz = 50, .value = 0x04 }, + { .hz = 75, .value = 0x05 }, + }, + }, + .pw = { + .addr = 0x10, + .mask = 0x70, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .fs_avl = { + /* + * Pressure and temperature sensitivity values + * as defined in table 3 of LPS22HB datasheet. + */ + [0] = { + .num = ST_PRESS_FS_AVL_1260MB, + .gain = ST_PRESS_KPASCAL_NANO_SCALE, + .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS, + }, + }, + }, + .bdu = { + .addr = 0x10, + .mask = 0x02, + }, + .drdy_irq = { + .int1 = { + .addr = 0x12, + .mask = 0x04, + .addr_od = 0x12, + .mask_od = 0x40, + }, + .addr_ihl = 0x12, + .mask_ihl = 0x80, + .stat_drdy = { + .addr = ST_SENSORS_DEFAULT_STAT_ADDR, + .mask = 0x03, + }, + }, + .sim = { + .addr = 0x10, + .value = BIT(0), + }, + .multi_read_bit = false, + .bootime = 2, + }, + { + /* + * CUSTOM VALUES FOR LPS22HH SENSOR + * See LPS22HH datasheet: + * http://www2.st.com/resource/en/datasheet/lps22hh.pdf + */ + .wai = 0xb3, + .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, + .sensors_supported = { + [0] = LPS22HH_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_lps22hb_channels, + .num_ch = ARRAY_SIZE(st_press_lps22hb_channels), + .odr = { + .addr = 0x10, + .mask = 0x70, + .odr_avl = { + { .hz = 1, .value = 0x01 }, + { .hz = 10, .value = 0x02 }, + { .hz = 25, .value = 0x03 }, + { .hz = 50, .value = 0x04 }, + { .hz = 75, .value = 0x05 }, + { .hz = 100, .value = 0x06 }, + { .hz = 200, .value = 0x07 }, + }, + }, + .pw = { + .addr = 0x10, + .mask = 0x70, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .fs_avl = { + /* + * Pressure and temperature sensitivity values + * as defined in table 3 of LPS22HH datasheet. + */ + [0] = { + .num = ST_PRESS_FS_AVL_1260MB, + .gain = ST_PRESS_KPASCAL_NANO_SCALE, + .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS, + }, + }, + }, + .bdu = { + .addr = 0x10, + .mask = BIT(1), + }, + .drdy_irq = { + .int1 = { + .addr = 0x12, + .mask = BIT(2), + .addr_od = 0x11, + .mask_od = BIT(5), + }, + .addr_ihl = 0x11, + .mask_ihl = BIT(6), + .stat_drdy = { + .addr = ST_SENSORS_DEFAULT_STAT_ADDR, + .mask = 0x03, + }, + }, + .sim = { + .addr = 0x10, + .value = BIT(0), + }, + .multi_read_bit = false, + .bootime = 2, + }, + { + /* + * CUSTOM VALUES FOR LPS22DF SENSOR + * See LPS22DF datasheet: + * http://www.st.com/resource/en/datasheet/lps22df.pdf + */ + .wai = 0xb4, + .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, + .sensors_supported = { + [0] = LPS22DF_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_lps22hb_channels, + .num_ch = ARRAY_SIZE(st_press_lps22hb_channels), + .odr = { + .addr = 0x10, + .mask = 0x78, + .odr_avl = { + { .hz = 1, .value = 0x01 }, + { .hz = 4, .value = 0x02 }, + { .hz = 10, .value = 0x03 }, + { .hz = 25, .value = 0x04 }, + { .hz = 50, .value = 0x05 }, + { .hz = 75, .value = 0x06 }, + { .hz = 100, .value = 0x07 }, + { .hz = 200, .value = 0x08 }, + }, + }, + .pw = { + .addr = 0x10, + .mask = 0x78, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .fs_avl = { + /* + * Pressure and temperature sensitivity values + * as defined in table 2 of LPS22DF datasheet. + */ + [0] = { + .num = ST_PRESS_FS_AVL_1260MB, + .gain = ST_PRESS_KPASCAL_NANO_SCALE, + .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS, + }, + }, + }, + .bdu = { + .addr = 0x11, + .mask = BIT(3), + }, + .drdy_irq = { + .int1 = { + .addr = 0x13, + .mask = BIT(5), + .addr_od = 0x12, + .mask_od = BIT(1), + }, + .addr_ihl = 0x12, + .mask_ihl = BIT(3), + .stat_drdy = { + .addr = ST_SENSORS_DEFAULT_STAT_ADDR, + .mask = 0x03, + }, + }, + .sim = { + .addr = 0x0E, + .value = BIT(5), + }, + .multi_read_bit = false, + .bootime = 2, + }, +}; + +static int st_press_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *ch, + int val, + int val2, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + if (val2) + return -EINVAL; + + return st_sensors_set_odr(indio_dev, val); + default: + return -EINVAL; + } +} + +static int st_press_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *ch, int *val, + int *val2, long mask) +{ + int err; + struct st_sensor_data *press_data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + err = st_sensors_read_info_raw(indio_dev, ch, val); + if (err < 0) + goto read_error; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + switch (ch->type) { + case IIO_PRESSURE: + *val = 0; + *val2 = press_data->current_fullscale->gain; + return IIO_VAL_INT_PLUS_NANO; + case IIO_TEMP: + *val = MCELSIUS_PER_CELSIUS; + *val2 = press_data->current_fullscale->gain2; + return IIO_VAL_FRACTIONAL; + default: + err = -EINVAL; + goto read_error; + } + + case IIO_CHAN_INFO_OFFSET: + switch (ch->type) { + case IIO_TEMP: + *val = ST_PRESS_MILLI_CELSIUS_OFFSET * + press_data->current_fullscale->gain2; + *val2 = MCELSIUS_PER_CELSIUS; + break; + default: + err = -EINVAL; + goto read_error; + } + + return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = press_data->odr; + return IIO_VAL_INT; + default: + return -EINVAL; + } + +read_error: + return err; +} + +static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); + +static struct attribute *st_press_attributes[] = { + &iio_dev_attr_sampling_frequency_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group st_press_attribute_group = { + .attrs = st_press_attributes, +}; + +static const struct iio_info press_info = { + .attrs = &st_press_attribute_group, + .read_raw = &st_press_read_raw, + .write_raw = &st_press_write_raw, + .debugfs_reg_access = &st_sensors_debugfs_reg_access, +}; + +#ifdef CONFIG_IIO_TRIGGER +static const struct iio_trigger_ops st_press_trigger_ops = { + .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE, + .validate_device = st_sensors_validate_device, +}; +#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops) +#else +#define ST_PRESS_TRIGGER_OPS NULL +#endif + +/* + * st_press_get_settings() - get sensor settings from device name + * @name: device name buffer reference. + * + * Return: valid reference on success, NULL otherwise. + */ +const struct st_sensor_settings *st_press_get_settings(const char *name) +{ + int index = st_sensors_get_settings_index(name, + st_press_sensors_settings, + ARRAY_SIZE(st_press_sensors_settings)); + if (index < 0) + return NULL; + + return &st_press_sensors_settings[index]; +} +EXPORT_SYMBOL_NS(st_press_get_settings, IIO_ST_SENSORS); + +int st_press_common_probe(struct iio_dev *indio_dev) +{ + struct st_sensor_data *press_data = iio_priv(indio_dev); + struct device *parent = indio_dev->dev.parent; + struct st_sensors_platform_data *pdata = dev_get_platdata(parent); + int err; + + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &press_info; + + err = st_sensors_verify_id(indio_dev); + if (err < 0) + return err; + + /* + * Skip timestamping channel while declaring available channels to + * common st_sensor layer. Look at st_sensors_get_buffer_element() to + * see how timestamps are explicitly pushed as last samples block + * element. + */ + press_data->num_data_channels = press_data->sensor_settings->num_ch - 1; + indio_dev->channels = press_data->sensor_settings->ch; + indio_dev->num_channels = press_data->sensor_settings->num_ch; + + press_data->current_fullscale = &press_data->sensor_settings->fs.fs_avl[0]; + + press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz; + + /* Some devices don't support a data ready pin. */ + if (!pdata && (press_data->sensor_settings->drdy_irq.int1.addr || + press_data->sensor_settings->drdy_irq.int2.addr)) + pdata = (struct st_sensors_platform_data *)&default_press_pdata; + + err = st_sensors_init_sensor(indio_dev, pdata); + if (err < 0) + return err; + + err = st_press_allocate_ring(indio_dev); + if (err < 0) + return err; + + if (press_data->irq > 0) { + err = st_sensors_allocate_trigger(indio_dev, + ST_PRESS_TRIGGER_OPS); + if (err < 0) + return err; + } + + return devm_iio_device_register(parent, indio_dev); +} +EXPORT_SYMBOL_NS(st_press_common_probe, IIO_ST_SENSORS); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics pressures driver"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(IIO_ST_SENSORS); |