123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522 |
- /*
- * STMicroelectronics pressures driver
- *
- * Copyright 2013 STMicroelectronics Inc.
- *
- * Denis Ciocca <denis.ciocca@st.com>
- *
- * Licensed under the GPL-2.
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/mutex.h>
- #include <linux/interrupt.h>
- #include <linux/i2c.h>
- #include <linux/gpio.h>
- #include <linux/irq.h>
- #include <linux/delay.h>
- #include <linux/iio/iio.h>
- #include <linux/iio/sysfs.h>
- #include <linux/iio/trigger.h>
- #include <linux/iio/buffer.h>
- #include <asm/unaligned.h>
- #include <linux/iio/common/st_sensors.h>
- #include "st_pressure.h"
- #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
- #define ST_PRESS_NUMBER_DATA_CHANNELS 1
- /* 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
- /* CUSTOM VALUES FOR LPS331AP SENSOR */
- #define ST_PRESS_LPS331AP_WAI_EXP 0xbb
- #define ST_PRESS_LPS331AP_ODR_ADDR 0x20
- #define ST_PRESS_LPS331AP_ODR_MASK 0x70
- #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL 0x01
- #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL 0x05
- #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL 0x06
- #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL 0x07
- #define ST_PRESS_LPS331AP_PW_ADDR 0x20
- #define ST_PRESS_LPS331AP_PW_MASK 0x80
- #define ST_PRESS_LPS331AP_FS_ADDR 0x23
- #define ST_PRESS_LPS331AP_FS_MASK 0x30
- #define ST_PRESS_LPS331AP_BDU_ADDR 0x20
- #define ST_PRESS_LPS331AP_BDU_MASK 0x04
- #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR 0x22
- #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK 0x04
- #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK 0x20
- #define ST_PRESS_LPS331AP_MULTIREAD_BIT true
- /* CUSTOM VALUES FOR LPS001WP SENSOR */
- /* LPS001WP pressure resolution */
- #define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
- /* LPS001WP temperature resolution */
- #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
- #define ST_PRESS_LPS001WP_WAI_EXP 0xba
- #define ST_PRESS_LPS001WP_ODR_ADDR 0x20
- #define ST_PRESS_LPS001WP_ODR_MASK 0x30
- #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL 0x01
- #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL 0x02
- #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL 0x03
- #define ST_PRESS_LPS001WP_PW_ADDR 0x20
- #define ST_PRESS_LPS001WP_PW_MASK 0x40
- #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
- (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
- #define ST_PRESS_LPS001WP_BDU_ADDR 0x20
- #define ST_PRESS_LPS001WP_BDU_MASK 0x04
- #define ST_PRESS_LPS001WP_MULTIREAD_BIT true
- #define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
- #define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
- /* CUSTOM VALUES FOR LPS25H SENSOR */
- #define ST_PRESS_LPS25H_WAI_EXP 0xbd
- #define ST_PRESS_LPS25H_ODR_ADDR 0x20
- #define ST_PRESS_LPS25H_ODR_MASK 0x70
- #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL 0x01
- #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL 0x02
- #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL 0x03
- #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL 0x04
- #define ST_PRESS_LPS25H_PW_ADDR 0x20
- #define ST_PRESS_LPS25H_PW_MASK 0x80
- #define ST_PRESS_LPS25H_BDU_ADDR 0x20
- #define ST_PRESS_LPS25H_BDU_MASK 0x04
- #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR 0x23
- #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK 0x01
- #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK 0x10
- #define ST_PRESS_LPS25H_MULTIREAD_BIT true
- #define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
- #define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
- static const struct iio_chan_spec st_press_1_channels[] = {
- {
- .type = IIO_PRESSURE,
- .channel2 = IIO_NO_MOD,
- .address = ST_PRESS_1_OUT_XL_ADDR,
- .scan_index = ST_SENSORS_SCAN_X,
- .scan_type = {
- .sign = 'u',
- .realbits = 24,
- .storagebits = 24,
- .endianness = IIO_LE,
- },
- .info_mask_separate =
- BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
- .modified = 0,
- },
- {
- .type = IIO_TEMP,
- .channel2 = IIO_NO_MOD,
- .address = ST_TEMP_1_OUT_L_ADDR,
- .scan_index = -1,
- .scan_type = {
- .sign = 'u',
- .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),
- .modified = 0,
- },
- IIO_CHAN_SOFT_TIMESTAMP(1)
- };
- static const struct iio_chan_spec st_press_lps001wp_channels[] = {
- {
- .type = IIO_PRESSURE,
- .channel2 = IIO_NO_MOD,
- .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
- .scan_index = ST_SENSORS_SCAN_X,
- .scan_type = {
- .sign = 'u',
- .realbits = 16,
- .storagebits = 16,
- .endianness = IIO_LE,
- },
- .info_mask_separate =
- BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE),
- .modified = 0,
- },
- {
- .type = IIO_TEMP,
- .channel2 = IIO_NO_MOD,
- .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
- .scan_index = -1,
- .scan_type = {
- .sign = 'u',
- .realbits = 16,
- .storagebits = 16,
- .endianness = IIO_LE,
- },
- .info_mask_separate =
- BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE),
- .modified = 0,
- },
- IIO_CHAN_SOFT_TIMESTAMP(1)
- };
- static const struct st_sensor_settings st_press_sensors_settings[] = {
- {
- .wai = ST_PRESS_LPS331AP_WAI_EXP,
- .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 = ST_PRESS_LPS331AP_ODR_ADDR,
- .mask = ST_PRESS_LPS331AP_ODR_MASK,
- .odr_avl = {
- { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
- { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
- { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
- { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
- },
- },
- .pw = {
- .addr = ST_PRESS_LPS331AP_PW_ADDR,
- .mask = ST_PRESS_LPS331AP_PW_MASK,
- .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
- .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
- },
- .fs = {
- .addr = ST_PRESS_LPS331AP_FS_ADDR,
- .mask = ST_PRESS_LPS331AP_FS_MASK,
- .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 = ST_PRESS_LPS331AP_BDU_ADDR,
- .mask = ST_PRESS_LPS331AP_BDU_MASK,
- },
- .drdy_irq = {
- .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
- .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
- .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
- },
- .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
- .bootime = 2,
- },
- {
- .wai = ST_PRESS_LPS001WP_WAI_EXP,
- .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 = ST_PRESS_LPS001WP_ODR_ADDR,
- .mask = ST_PRESS_LPS001WP_ODR_MASK,
- .odr_avl = {
- { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
- { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
- { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
- },
- },
- .pw = {
- .addr = ST_PRESS_LPS001WP_PW_ADDR,
- .mask = ST_PRESS_LPS001WP_PW_MASK,
- .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 = ST_PRESS_LPS001WP_BDU_ADDR,
- .mask = ST_PRESS_LPS001WP_BDU_MASK,
- },
- .drdy_irq = {
- .addr = 0,
- },
- .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
- .bootime = 2,
- },
- {
- .wai = ST_PRESS_LPS25H_WAI_EXP,
- .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 = ST_PRESS_LPS25H_ODR_ADDR,
- .mask = ST_PRESS_LPS25H_ODR_MASK,
- .odr_avl = {
- { 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
- { 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
- { 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
- { 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
- },
- },
- .pw = {
- .addr = ST_PRESS_LPS25H_PW_ADDR,
- .mask = ST_PRESS_LPS25H_PW_MASK,
- .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 = ST_PRESS_LPS25H_BDU_ADDR,
- .mask = ST_PRESS_LPS25H_BDU_MASK,
- },
- .drdy_irq = {
- .addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
- .mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
- .mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
- },
- .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
- .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)
- {
- int err;
- switch (mask) {
- case IIO_CHAN_INFO_SAMP_FREQ:
- if (val2)
- return -EINVAL;
- mutex_lock(&indio_dev->mlock);
- err = st_sensors_set_odr(indio_dev, val);
- mutex_unlock(&indio_dev->mlock);
- return err;
- 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 = {
- .driver_module = THIS_MODULE,
- .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 = {
- .owner = THIS_MODULE,
- .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
- };
- #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
- #else
- #define ST_PRESS_TRIGGER_OPS NULL
- #endif
- int st_press_common_probe(struct iio_dev *indio_dev)
- {
- struct st_sensor_data *press_data = iio_priv(indio_dev);
- struct st_sensors_platform_data *pdata =
- (struct st_sensors_platform_data *)press_data->dev->platform_data;
- int irq = press_data->get_irq_data_ready(indio_dev);
- int err;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->info = &press_info;
- mutex_init(&press_data->tb.buf_lock);
- st_sensors_power_enable(indio_dev);
- err = st_sensors_check_device_support(indio_dev,
- ARRAY_SIZE(st_press_sensors_settings),
- st_press_sensors_settings);
- if (err < 0)
- return err;
- press_data->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
- press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
- indio_dev->channels = press_data->sensor_settings->ch;
- indio_dev->num_channels = press_data->sensor_settings->num_ch;
- if (press_data->sensor_settings->fs.addr != 0)
- press_data->current_fullscale =
- (struct st_sensor_fullscale_avl *)
- &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.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 (irq > 0) {
- err = st_sensors_allocate_trigger(indio_dev,
- ST_PRESS_TRIGGER_OPS);
- if (err < 0)
- goto st_press_probe_trigger_error;
- }
- err = iio_device_register(indio_dev);
- if (err)
- goto st_press_device_register_error;
- dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
- indio_dev->name);
- return err;
- st_press_device_register_error:
- if (irq > 0)
- st_sensors_deallocate_trigger(indio_dev);
- st_press_probe_trigger_error:
- st_press_deallocate_ring(indio_dev);
- return err;
- }
- EXPORT_SYMBOL(st_press_common_probe);
- void st_press_common_remove(struct iio_dev *indio_dev)
- {
- struct st_sensor_data *press_data = iio_priv(indio_dev);
- st_sensors_power_disable(indio_dev);
- iio_device_unregister(indio_dev);
- if (press_data->get_irq_data_ready(indio_dev) > 0)
- st_sensors_deallocate_trigger(indio_dev);
- st_press_deallocate_ring(indio_dev);
- }
- EXPORT_SYMBOL(st_press_common_remove);
- MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
- MODULE_DESCRIPTION("STMicroelectronics pressures driver");
- MODULE_LICENSE("GPL v2");
|