mirror of https://gitee.com/openkylin/linux.git
694 lines
17 KiB
C
694 lines
17 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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/*
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* About determining pressure scaling factors
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* ------------------------------------------
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*
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* Datasheets specify typical pressure sensitivity so that pressure is computed
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* according to the following equation :
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* pressure[mBar] = raw / sensitivity
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* where :
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* raw the 24 bits long raw sampled pressure
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* sensitivity a scaling factor specified by the datasheet in LSB/mBar
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*
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* IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
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* computed according to :
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* pressure[kPascal] = pressure[mBar] / 10
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* = raw / (sensitivity * 10) (1)
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*
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* Finally, st_press_read_raw() returns pressure scaling factor as an
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* IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
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* Therefore, from (1), "gain" becomes :
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* gain = 10^9 / (sensitivity * 10)
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* = 10^8 / sensitivity
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*
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* About determining temperature scaling factors and offsets
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* ---------------------------------------------------------
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*
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* Datasheets specify typical temperature sensitivity and offset so that
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* temperature is computed according to the following equation :
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* temp[Celsius] = offset[Celsius] + (raw / sensitivity)
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* where :
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* raw the 16 bits long raw sampled temperature
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* offset a constant specified by the datasheet in degree Celsius
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* (sometimes zero)
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* sensitivity a scaling factor specified by the datasheet in LSB/Celsius
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*
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* IIO ABI expects temperature to be expressed as milli degree Celsius such as
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* user space should compute temperature according to :
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* temp[mCelsius] = temp[Celsius] * 10^3
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* = (offset[Celsius] + (raw / sensitivity)) * 10^3
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* = ((offset[Celsius] * sensitivity) + raw) *
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* (10^3 / sensitivity) (2)
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*
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* IIO ABI expects user space to apply offset and scaling factors to raw samples
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* according to :
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* temp[mCelsius] = (OFFSET + raw) * SCALE
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* where :
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* OFFSET an arbitrary constant exposed by device
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* SCALE an arbitrary scaling factor exposed by device
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*
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* Matching OFFSET and SCALE with members of (2) gives :
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* OFFSET = offset[Celsius] * sensitivity (3)
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* SCALE = 10^3 / sensitivity (4)
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*
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* st_press_read_raw() returns temperature scaling factor as an
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* IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
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* Therefore, from (3), "gain2" becomes :
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* gain2 = sensitivity
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*
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* When declared within channel, i.e. for a non zero specified offset,
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* st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
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* numerator = OFFSET * 10^3
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* denominator = 10^3
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* giving from (4):
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* numerator = offset[Celsius] * 10^3 * sensitivity
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* = offset[mCelsius] * gain2
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*/
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#define MCELSIUS_PER_CELSIUS 1000
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/* Default pressure sensitivity */
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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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/* Default temperature sensitivity */
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#define ST_PRESS_LSB_PER_CELSIUS 480UL
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#define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL
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/* FULLSCALE */
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#define ST_PRESS_FS_AVL_1100MB 1100
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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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/* LPS001WP pressure resolution */
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#define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
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/* LPS001WP temperature resolution */
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#define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
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/* LPS001WP pressure gain */
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#define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
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(100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
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/* LPS001WP pressure and temp L addresses */
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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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/* LPS25H pressure and temp L addresses */
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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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/* LPS22HB temperature sensitivity */
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#define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL
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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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.address = ST_PRESS_1_OUT_XL_ADDR,
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.scan_index = 0,
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.scan_type = {
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.sign = 's',
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.realbits = 24,
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.storagebits = 32,
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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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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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},
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{
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.type = IIO_TEMP,
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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 = 's',
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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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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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},
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IIO_CHAN_SOFT_TIMESTAMP(2)
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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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.address = ST_PRESS_LPS001WP_OUT_L_ADDR,
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.scan_index = 0,
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.scan_type = {
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.sign = 's',
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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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},
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{
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.type = IIO_TEMP,
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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 = 's',
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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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},
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IIO_CHAN_SOFT_TIMESTAMP(2)
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};
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static const struct iio_chan_spec st_press_lps22hb_channels[] = {
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{
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.type = IIO_PRESSURE,
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.address = ST_PRESS_1_OUT_XL_ADDR,
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.scan_index = 0,
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.scan_type = {
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.sign = 's',
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.realbits = 24,
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.storagebits = 32,
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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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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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},
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{
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.type = IIO_TEMP,
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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 = 's',
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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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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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},
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IIO_CHAN_SOFT_TIMESTAMP(2)
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};
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static const struct st_sensor_settings st_press_sensors_settings[] = {
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{
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/*
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* CUSTOM VALUES FOR LPS331AP SENSOR
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* See LPS331AP datasheet:
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* http://www2.st.com/resource/en/datasheet/lps331ap.pdf
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*/
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.wai = 0xbb,
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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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 = 0x20,
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.mask = 0x70,
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.odr_avl = {
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{ .hz = 1, .value = 0x01 },
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{ .hz = 7, .value = 0x05 },
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{ .hz = 13, .value = 0x06 },
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{ .hz = 25, .value = 0x07 },
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},
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},
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.pw = {
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.addr = 0x20,
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.mask = 0x80,
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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 = 0x23,
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.mask = 0x30,
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.fs_avl = {
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/*
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* Pressure and temperature sensitivity values
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* as defined in table 3 of LPS331AP datasheet.
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*/
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[0] = {
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.num = ST_PRESS_FS_AVL_1260MB,
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.gain = ST_PRESS_KPASCAL_NANO_SCALE,
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.gain2 = ST_PRESS_LSB_PER_CELSIUS,
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},
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},
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},
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.bdu = {
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.addr = 0x20,
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.mask = 0x04,
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},
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.drdy_irq = {
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.int1 = {
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.addr = 0x22,
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.mask = 0x04,
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},
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.int2 = {
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.addr = 0x22,
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.mask = 0x20,
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},
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.addr_ihl = 0x22,
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.mask_ihl = 0x80,
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.addr_od = 0x22,
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.mask_od = 0x40,
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.stat_drdy = {
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.addr = ST_SENSORS_DEFAULT_STAT_ADDR,
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.mask = 0x03,
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},
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},
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.sim = {
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.addr = 0x20,
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.value = BIT(0),
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},
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.multi_read_bit = true,
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.bootime = 2,
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},
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{
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/*
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* CUSTOM VALUES FOR LPS001WP SENSOR
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*/
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.wai = 0xba,
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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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 = 0x20,
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.mask = 0x30,
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.odr_avl = {
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{ .hz = 1, .value = 0x01 },
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{ .hz = 7, .value = 0x02 },
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{ .hz = 13, .value = 0x03 },
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},
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},
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.pw = {
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.addr = 0x20,
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.mask = 0x40,
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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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.fs_avl = {
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/*
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* Pressure and temperature resolution values
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* as defined in table 3 of LPS001WP datasheet.
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*/
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[0] = {
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.num = ST_PRESS_FS_AVL_1100MB,
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.gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
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.gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
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},
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},
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},
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.bdu = {
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.addr = 0x20,
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.mask = 0x04,
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},
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.sim = {
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.addr = 0x20,
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.value = BIT(0),
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},
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.multi_read_bit = true,
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.bootime = 2,
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},
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{
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/*
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* CUSTOM VALUES FOR LPS25H SENSOR
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* See LPS25H datasheet:
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* http://www2.st.com/resource/en/datasheet/lps25h.pdf
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*/
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.wai = 0xbd,
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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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 = 0x20,
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.mask = 0x70,
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.odr_avl = {
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{ .hz = 1, .value = 0x01 },
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{ .hz = 7, .value = 0x02 },
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{ .hz = 13, .value = 0x03 },
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{ .hz = 25, .value = 0x04 },
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},
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},
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.pw = {
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.addr = 0x20,
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.mask = 0x80,
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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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.fs_avl = {
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/*
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* Pressure and temperature sensitivity values
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* as defined in table 3 of LPS25H datasheet.
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*/
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[0] = {
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.num = ST_PRESS_FS_AVL_1260MB,
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.gain = ST_PRESS_KPASCAL_NANO_SCALE,
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.gain2 = ST_PRESS_LSB_PER_CELSIUS,
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},
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},
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},
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.bdu = {
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.addr = 0x20,
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.mask = 0x04,
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},
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.drdy_irq = {
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.int1 = {
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.addr = 0x23,
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.mask = 0x01,
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},
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.addr_ihl = 0x22,
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.mask_ihl = 0x80,
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.addr_od = 0x22,
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.mask_od = 0x40,
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.stat_drdy = {
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.addr = ST_SENSORS_DEFAULT_STAT_ADDR,
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.mask = 0x03,
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},
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},
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.sim = {
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.addr = 0x20,
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.value = BIT(0),
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},
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.multi_read_bit = true,
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.bootime = 2,
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},
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{
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/*
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* CUSTOM VALUES FOR LPS22HB SENSOR
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* See LPS22HB datasheet:
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* http://www2.st.com/resource/en/datasheet/lps22hb.pdf
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*/
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.wai = 0xb1,
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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.sensors_supported = {
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[0] = LPS22HB_PRESS_DEV_NAME,
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[1] = LPS33HW_PRESS_DEV_NAME,
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[2] = LPS35HW_PRESS_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
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.num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
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.odr = {
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.addr = 0x10,
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.mask = 0x70,
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.odr_avl = {
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{ .hz = 1, .value = 0x01 },
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{ .hz = 10, .value = 0x02 },
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{ .hz = 25, .value = 0x03 },
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{ .hz = 50, .value = 0x04 },
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{ .hz = 75, .value = 0x05 },
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},
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},
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.pw = {
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.addr = 0x10,
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.mask = 0x70,
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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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.fs_avl = {
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/*
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* Pressure and temperature sensitivity values
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* as defined in table 3 of LPS22HB datasheet.
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*/
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[0] = {
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.num = ST_PRESS_FS_AVL_1260MB,
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.gain = ST_PRESS_KPASCAL_NANO_SCALE,
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.gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
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},
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},
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},
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.bdu = {
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.addr = 0x10,
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.mask = 0x02,
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},
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.drdy_irq = {
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.int1 = {
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.addr = 0x12,
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.mask = 0x04,
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},
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.addr_ihl = 0x12,
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.mask_ihl = 0x80,
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.addr_od = 0x12,
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.mask_od = 0x40,
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.stat_drdy = {
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.addr = ST_SENSORS_DEFAULT_STAT_ADDR,
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.mask = 0x03,
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},
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},
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.sim = {
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.addr = 0x10,
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.value = BIT(0),
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},
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.multi_read_bit = false,
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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,
|
|
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 = {
|
|
.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
|
|
|
|
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);
|
|
|
|
err = st_sensors_power_enable(indio_dev);
|
|
if (err)
|
|
return err;
|
|
|
|
err = st_sensors_check_device_support(indio_dev,
|
|
ARRAY_SIZE(st_press_sensors_settings),
|
|
st_press_sensors_settings);
|
|
if (err < 0)
|
|
goto st_press_power_off;
|
|
|
|
/*
|
|
* 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;
|
|
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;
|
|
|
|
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.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, press_data->dev->platform_data);
|
|
if (err < 0)
|
|
goto st_press_power_off;
|
|
|
|
err = st_press_allocate_ring(indio_dev);
|
|
if (err < 0)
|
|
goto st_press_power_off;
|
|
|
|
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);
|
|
st_press_power_off:
|
|
st_sensors_power_disable(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");
|