497 lines
13 KiB
C
497 lines
13 KiB
C
/*
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* STMicroelectronics pressures driver
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*
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* Copyright 2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/buffer.h>
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#include <asm/unaligned.h>
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#include <linux/iio/common/st_sensors.h>
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#include "st_pressure.h"
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#define ST_PRESS_LSB_PER_MBAR 4096UL
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#define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
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ST_PRESS_LSB_PER_MBAR)
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#define ST_PRESS_LSB_PER_CELSIUS 480UL
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#define ST_PRESS_CELSIUS_NANO_SCALE (1000000000UL / \
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ST_PRESS_LSB_PER_CELSIUS)
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#define ST_PRESS_NUMBER_DATA_CHANNELS 1
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/* FULLSCALE */
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#define ST_PRESS_FS_AVL_1260MB 1260
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#define ST_PRESS_1_OUT_XL_ADDR 0x28
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#define ST_TEMP_1_OUT_L_ADDR 0x2b
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/* CUSTOM VALUES FOR LPS331AP SENSOR */
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#define ST_PRESS_LPS331AP_WAI_EXP 0xbb
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#define ST_PRESS_LPS331AP_ODR_ADDR 0x20
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#define ST_PRESS_LPS331AP_ODR_MASK 0x70
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#define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL 0x01
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#define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL 0x05
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#define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL 0x06
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#define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL 0x07
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#define ST_PRESS_LPS331AP_PW_ADDR 0x20
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#define ST_PRESS_LPS331AP_PW_MASK 0x80
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#define ST_PRESS_LPS331AP_FS_ADDR 0x23
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#define ST_PRESS_LPS331AP_FS_MASK 0x30
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#define ST_PRESS_LPS331AP_FS_AVL_1260_VAL 0x00
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#define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE
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#define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE
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#define ST_PRESS_LPS331AP_BDU_ADDR 0x20
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#define ST_PRESS_LPS331AP_BDU_MASK 0x04
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#define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR 0x22
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#define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK 0x04
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#define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK 0x20
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#define ST_PRESS_LPS331AP_MULTIREAD_BIT true
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#define ST_PRESS_LPS331AP_TEMP_OFFSET 42500
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/* CUSTOM VALUES FOR LPS001WP SENSOR */
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#define ST_PRESS_LPS001WP_WAI_EXP 0xba
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#define ST_PRESS_LPS001WP_ODR_ADDR 0x20
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#define ST_PRESS_LPS001WP_ODR_MASK 0x30
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#define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL 0x01
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#define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL 0x02
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#define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL 0x03
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#define ST_PRESS_LPS001WP_PW_ADDR 0x20
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#define ST_PRESS_LPS001WP_PW_MASK 0x40
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#define ST_PRESS_LPS001WP_BDU_ADDR 0x20
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#define ST_PRESS_LPS001WP_BDU_MASK 0x04
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#define ST_PRESS_LPS001WP_MULTIREAD_BIT true
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#define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
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#define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
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/* CUSTOM VALUES FOR LPS25H SENSOR */
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#define ST_PRESS_LPS25H_WAI_EXP 0xbd
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#define ST_PRESS_LPS25H_ODR_ADDR 0x20
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#define ST_PRESS_LPS25H_ODR_MASK 0x70
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#define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL 0x01
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#define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL 0x02
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#define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL 0x03
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#define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL 0x04
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#define ST_PRESS_LPS25H_PW_ADDR 0x20
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#define ST_PRESS_LPS25H_PW_MASK 0x80
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#define ST_PRESS_LPS25H_FS_ADDR 0x00
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#define ST_PRESS_LPS25H_FS_MASK 0x00
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#define ST_PRESS_LPS25H_FS_AVL_1260_VAL 0x00
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#define ST_PRESS_LPS25H_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE
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#define ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE
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#define ST_PRESS_LPS25H_BDU_ADDR 0x20
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#define ST_PRESS_LPS25H_BDU_MASK 0x04
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#define ST_PRESS_LPS25H_DRDY_IRQ_ADDR 0x23
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#define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK 0x01
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#define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK 0x10
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#define ST_PRESS_LPS25H_MULTIREAD_BIT true
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#define ST_PRESS_LPS25H_TEMP_OFFSET 42500
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#define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
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#define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
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static const struct iio_chan_spec st_press_1_channels[] = {
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{
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.type = IIO_PRESSURE,
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.channel2 = IIO_NO_MOD,
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.address = ST_PRESS_1_OUT_XL_ADDR,
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.scan_index = ST_SENSORS_SCAN_X,
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.scan_type = {
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.sign = 'u',
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.realbits = 24,
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.storagebits = 24,
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.endianness = IIO_LE,
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},
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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.modified = 0,
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},
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{
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.type = IIO_TEMP,
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.channel2 = IIO_NO_MOD,
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.address = ST_TEMP_1_OUT_L_ADDR,
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.scan_index = -1,
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.scan_type = {
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.sign = 'u',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_LE,
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},
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.modified = 0,
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},
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IIO_CHAN_SOFT_TIMESTAMP(1)
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};
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static const struct iio_chan_spec st_press_lps001wp_channels[] = {
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{
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.type = IIO_PRESSURE,
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.channel2 = IIO_NO_MOD,
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.address = ST_PRESS_LPS001WP_OUT_L_ADDR,
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.scan_index = ST_SENSORS_SCAN_X,
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.scan_type = {
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.sign = 'u',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_LE,
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},
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.modified = 0,
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},
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{
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.type = IIO_TEMP,
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.channel2 = IIO_NO_MOD,
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.address = ST_TEMP_LPS001WP_OUT_L_ADDR,
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.scan_index = -1,
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.scan_type = {
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.sign = 'u',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_LE,
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},
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.modified = 0,
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},
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IIO_CHAN_SOFT_TIMESTAMP(1)
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};
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static const struct st_sensors st_press_sensors[] = {
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{
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.wai = ST_PRESS_LPS331AP_WAI_EXP,
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.sensors_supported = {
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[0] = LPS331AP_PRESS_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_press_1_channels,
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.num_ch = ARRAY_SIZE(st_press_1_channels),
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.odr = {
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.addr = ST_PRESS_LPS331AP_ODR_ADDR,
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.mask = ST_PRESS_LPS331AP_ODR_MASK,
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.odr_avl = {
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{ 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
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{ 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
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{ 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
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{ 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
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},
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},
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.pw = {
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.addr = ST_PRESS_LPS331AP_PW_ADDR,
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.mask = ST_PRESS_LPS331AP_PW_MASK,
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.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
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.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
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},
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.fs = {
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.addr = ST_PRESS_LPS331AP_FS_ADDR,
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.mask = ST_PRESS_LPS331AP_FS_MASK,
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.fs_avl = {
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[0] = {
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.num = ST_PRESS_FS_AVL_1260MB,
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.value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
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.gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
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.gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
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},
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},
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},
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.bdu = {
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.addr = ST_PRESS_LPS331AP_BDU_ADDR,
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.mask = ST_PRESS_LPS331AP_BDU_MASK,
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},
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.drdy_irq = {
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.addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
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.mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
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.mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
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},
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.multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
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.bootime = 2,
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},
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{
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.wai = ST_PRESS_LPS001WP_WAI_EXP,
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.sensors_supported = {
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[0] = LPS001WP_PRESS_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
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.num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
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.odr = {
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.addr = ST_PRESS_LPS001WP_ODR_ADDR,
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.mask = ST_PRESS_LPS001WP_ODR_MASK,
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.odr_avl = {
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{ 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
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{ 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
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{ 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
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},
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},
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.pw = {
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.addr = ST_PRESS_LPS001WP_PW_ADDR,
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.mask = ST_PRESS_LPS001WP_PW_MASK,
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.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
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.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
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},
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.fs = {
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.addr = 0,
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},
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.bdu = {
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.addr = ST_PRESS_LPS001WP_BDU_ADDR,
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.mask = ST_PRESS_LPS001WP_BDU_MASK,
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},
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.drdy_irq = {
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.addr = 0,
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},
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.multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
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.bootime = 2,
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},
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{
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.wai = ST_PRESS_LPS25H_WAI_EXP,
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.sensors_supported = {
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[0] = LPS25H_PRESS_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_press_1_channels,
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.num_ch = ARRAY_SIZE(st_press_1_channels),
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.odr = {
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.addr = ST_PRESS_LPS25H_ODR_ADDR,
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.mask = ST_PRESS_LPS25H_ODR_MASK,
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.odr_avl = {
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{ 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
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{ 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
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{ 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
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{ 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
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},
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},
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.pw = {
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.addr = ST_PRESS_LPS25H_PW_ADDR,
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.mask = ST_PRESS_LPS25H_PW_MASK,
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.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
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.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
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},
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.fs = {
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.addr = ST_PRESS_LPS25H_FS_ADDR,
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.mask = ST_PRESS_LPS25H_FS_MASK,
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.fs_avl = {
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[0] = {
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.num = ST_PRESS_FS_AVL_1260MB,
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.value = ST_PRESS_LPS25H_FS_AVL_1260_VAL,
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.gain = ST_PRESS_LPS25H_FS_AVL_1260_GAIN,
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.gain2 = ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN,
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},
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},
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},
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.bdu = {
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.addr = ST_PRESS_LPS25H_BDU_ADDR,
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.mask = ST_PRESS_LPS25H_BDU_MASK,
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},
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.drdy_irq = {
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.addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
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.mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
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.mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
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},
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.multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
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.bootime = 2,
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},
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};
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static int st_press_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *ch,
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int val,
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int val2,
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long mask)
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{
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int err;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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if (val2)
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return -EINVAL;
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mutex_lock(&indio_dev->mlock);
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err = st_sensors_set_odr(indio_dev, val);
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mutex_unlock(&indio_dev->mlock);
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return err;
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default:
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return -EINVAL;
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}
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}
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static int st_press_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *ch, int *val,
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int *val2, long mask)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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err = st_sensors_read_info_raw(indio_dev, ch, val);
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if (err < 0)
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goto read_error;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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switch (ch->type) {
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case IIO_PRESSURE:
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*val2 = pdata->current_fullscale->gain;
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break;
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case IIO_TEMP:
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*val2 = pdata->current_fullscale->gain2;
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break;
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default:
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err = -EINVAL;
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goto read_error;
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}
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return IIO_VAL_INT_PLUS_NANO;
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case IIO_CHAN_INFO_OFFSET:
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switch (ch->type) {
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case IIO_TEMP:
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*val = 425;
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*val2 = 10;
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break;
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default:
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err = -EINVAL;
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goto read_error;
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}
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return IIO_VAL_FRACTIONAL;
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case IIO_CHAN_INFO_SAMP_FREQ:
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*val = pdata->odr;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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read_error:
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return err;
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}
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static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
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static struct attribute *st_press_attributes[] = {
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group st_press_attribute_group = {
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.attrs = st_press_attributes,
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};
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static const struct iio_info press_info = {
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.driver_module = THIS_MODULE,
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.attrs = &st_press_attribute_group,
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.read_raw = &st_press_read_raw,
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.write_raw = &st_press_write_raw,
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};
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#ifdef CONFIG_IIO_TRIGGER
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static const struct iio_trigger_ops st_press_trigger_ops = {
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.owner = THIS_MODULE,
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.set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
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};
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#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
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#else
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#define ST_PRESS_TRIGGER_OPS NULL
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#endif
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int st_press_common_probe(struct iio_dev *indio_dev,
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struct st_sensors_platform_data *plat_data)
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{
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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int irq = pdata->get_irq_data_ready(indio_dev);
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int err;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &press_info;
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st_sensors_power_enable(indio_dev);
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err = st_sensors_check_device_support(indio_dev,
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ARRAY_SIZE(st_press_sensors),
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st_press_sensors);
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if (err < 0)
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return err;
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pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
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pdata->multiread_bit = pdata->sensor->multi_read_bit;
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indio_dev->channels = pdata->sensor->ch;
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indio_dev->num_channels = pdata->sensor->num_ch;
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if (pdata->sensor->fs.addr != 0)
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pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
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&pdata->sensor->fs.fs_avl[0];
|
|
|
|
pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
|
|
|
|
/* Some devices don't support a data ready pin. */
|
|
if (!plat_data && pdata->sensor->drdy_irq.addr)
|
|
plat_data =
|
|
(struct st_sensors_platform_data *)&default_press_pdata;
|
|
|
|
err = st_sensors_init_sensor(indio_dev, plat_data);
|
|
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 *pdata = iio_priv(indio_dev);
|
|
|
|
st_sensors_power_disable(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
if (pdata->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");
|