forked from Minki/linux
1371856416
Enable multiread by default for LIS3MDL since using I2C interface
the subaddr Msb is used to automatically increase the slave address
during multiple data read/write. In the same way, using SPI interface,
bit 1 in register address is used to enable auto-increment of the slave
address in multiple read/write.
Fixes: 872e79add7 (iio:magn: Add STMicroelectronics magn driver)
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
538 lines
12 KiB
C
538 lines
12 KiB
C
/*
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* STMicroelectronics magnetometers driver
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*
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* Copyright 2012-2013 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/buffer.h>
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#include <linux/iio/common/st_sensors.h>
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#include "st_magn.h"
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#define ST_MAGN_NUMBER_DATA_CHANNELS 3
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/* DEFAULT VALUE FOR SENSORS */
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#define ST_MAGN_DEFAULT_OUT_X_H_ADDR 0X03
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#define ST_MAGN_DEFAULT_OUT_Y_H_ADDR 0X07
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#define ST_MAGN_DEFAULT_OUT_Z_H_ADDR 0X05
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/* FULLSCALE */
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#define ST_MAGN_FS_AVL_1300MG 1300
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#define ST_MAGN_FS_AVL_1900MG 1900
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#define ST_MAGN_FS_AVL_2500MG 2500
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#define ST_MAGN_FS_AVL_4000MG 4000
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#define ST_MAGN_FS_AVL_4700MG 4700
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#define ST_MAGN_FS_AVL_5600MG 5600
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#define ST_MAGN_FS_AVL_8000MG 8000
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#define ST_MAGN_FS_AVL_8100MG 8100
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#define ST_MAGN_FS_AVL_12000MG 12000
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#define ST_MAGN_FS_AVL_15000MG 15000
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#define ST_MAGN_FS_AVL_16000MG 16000
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/* Special L addresses for Sensor 2 */
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#define ST_MAGN_2_OUT_X_L_ADDR 0x28
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#define ST_MAGN_2_OUT_Y_L_ADDR 0x2a
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#define ST_MAGN_2_OUT_Z_L_ADDR 0x2c
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/* Special L addresses for sensor 3 */
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#define ST_MAGN_3_OUT_X_L_ADDR 0x68
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#define ST_MAGN_3_OUT_Y_L_ADDR 0x6a
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#define ST_MAGN_3_OUT_Z_L_ADDR 0x6c
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static const struct iio_chan_spec st_magn_16bit_channels[] = {
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16,
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ST_MAGN_DEFAULT_OUT_X_H_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16,
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ST_MAGN_DEFAULT_OUT_Y_H_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16,
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ST_MAGN_DEFAULT_OUT_Z_H_ADDR),
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IIO_CHAN_SOFT_TIMESTAMP(3)
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};
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static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
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ST_MAGN_2_OUT_X_L_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
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ST_MAGN_2_OUT_Y_L_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
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ST_MAGN_2_OUT_Z_L_ADDR),
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IIO_CHAN_SOFT_TIMESTAMP(3)
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};
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static const struct iio_chan_spec st_magn_3_16bit_channels[] = {
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
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ST_MAGN_3_OUT_X_L_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
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ST_MAGN_3_OUT_Y_L_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
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ST_MAGN_3_OUT_Z_L_ADDR),
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IIO_CHAN_SOFT_TIMESTAMP(3)
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};
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static const struct st_sensor_settings st_magn_sensors_settings[] = {
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{
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.wai = 0, /* This sensor has no valid WhoAmI report 0 */
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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.sensors_supported = {
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[0] = LSM303DLH_MAGN_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_magn_16bit_channels,
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.odr = {
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.addr = 0x00,
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.mask = 0x1c,
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.odr_avl = {
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{ .hz = 1, .value = 0x00 },
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{ .hz = 2, .value = 0x01 },
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{ .hz = 3, .value = 0x02 },
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{ .hz = 8, .value = 0x03 },
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{ .hz = 15, .value = 0x04 },
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{ .hz = 30, .value = 0x05 },
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{ .hz = 75, .value = 0x06 },
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/* 220 Hz, 0x07 reportedly exist */
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},
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},
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.pw = {
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.addr = 0x02,
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.mask = 0x03,
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.value_on = 0x00,
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.value_off = 0x03,
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},
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.fs = {
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.addr = 0x01,
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.mask = 0xe0,
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.fs_avl = {
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[0] = {
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.num = ST_MAGN_FS_AVL_1300MG,
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.value = 0x01,
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.gain = 1100,
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.gain2 = 980,
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},
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[1] = {
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.num = ST_MAGN_FS_AVL_1900MG,
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.value = 0x02,
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.gain = 855,
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.gain2 = 760,
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},
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[2] = {
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.num = ST_MAGN_FS_AVL_2500MG,
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.value = 0x03,
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.gain = 670,
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.gain2 = 600,
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},
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[3] = {
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.num = ST_MAGN_FS_AVL_4000MG,
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.value = 0x04,
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.gain = 450,
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.gain2 = 400,
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},
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[4] = {
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.num = ST_MAGN_FS_AVL_4700MG,
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.value = 0x05,
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.gain = 400,
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.gain2 = 355,
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},
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[5] = {
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.num = ST_MAGN_FS_AVL_5600MG,
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.value = 0x06,
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.gain = 330,
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.gain2 = 295,
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},
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[6] = {
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.num = ST_MAGN_FS_AVL_8100MG,
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.value = 0x07,
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.gain = 230,
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.gain2 = 205,
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},
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},
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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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.wai = 0x3c,
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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.sensors_supported = {
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[0] = LSM303DLHC_MAGN_DEV_NAME,
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[1] = LSM303DLM_MAGN_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_magn_16bit_channels,
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.odr = {
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.addr = 0x00,
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.mask = 0x1c,
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.odr_avl = {
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{ .hz = 1, .value = 0x00 },
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{ .hz = 2, .value = 0x01 },
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{ .hz = 3, .value = 0x02 },
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{ .hz = 8, .value = 0x03 },
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{ .hz = 15, .value = 0x04 },
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{ .hz = 30, .value = 0x05 },
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{ .hz = 75, .value = 0x06 },
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{ .hz = 220, .value = 0x07 },
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},
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},
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.pw = {
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.addr = 0x02,
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.mask = 0x03,
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.value_on = 0x00,
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.value_off = 0x03,
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},
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.fs = {
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.addr = 0x01,
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.mask = 0xe0,
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.fs_avl = {
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[0] = {
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.num = ST_MAGN_FS_AVL_1300MG,
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.value = 0x01,
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.gain = 909,
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.gain2 = 1020,
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},
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[1] = {
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.num = ST_MAGN_FS_AVL_1900MG,
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.value = 0x02,
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.gain = 1169,
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.gain2 = 1315,
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},
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[2] = {
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.num = ST_MAGN_FS_AVL_2500MG,
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.value = 0x03,
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.gain = 1492,
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.gain2 = 1666,
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},
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[3] = {
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.num = ST_MAGN_FS_AVL_4000MG,
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.value = 0x04,
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.gain = 2222,
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.gain2 = 2500,
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},
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[4] = {
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.num = ST_MAGN_FS_AVL_4700MG,
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.value = 0x05,
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.gain = 2500,
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.gain2 = 2816,
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},
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[5] = {
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.num = ST_MAGN_FS_AVL_5600MG,
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.value = 0x06,
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.gain = 3030,
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.gain2 = 3389,
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},
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[6] = {
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.num = ST_MAGN_FS_AVL_8100MG,
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.value = 0x07,
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.gain = 4347,
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.gain2 = 4878,
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},
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},
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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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.wai = 0x3d,
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.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
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.sensors_supported = {
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[0] = LIS3MDL_MAGN_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
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.odr = {
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.addr = 0x20,
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.mask = 0x1c,
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.odr_avl = {
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{ .hz = 1, .value = 0x00 },
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{ .hz = 2, .value = 0x01 },
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{ .hz = 3, .value = 0x02 },
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{ .hz = 5, .value = 0x03 },
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{ .hz = 10, .value = 0x04 },
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{ .hz = 20, .value = 0x05 },
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{ .hz = 40, .value = 0x06 },
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{ .hz = 80, .value = 0x07 },
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},
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},
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.pw = {
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.addr = 0x22,
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.mask = 0x03,
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.value_on = 0x00,
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.value_off = 0x03,
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},
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.fs = {
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.addr = 0x21,
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.mask = 0x60,
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.fs_avl = {
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[0] = {
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.num = ST_MAGN_FS_AVL_4000MG,
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.value = 0x00,
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.gain = 146,
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},
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[1] = {
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.num = ST_MAGN_FS_AVL_8000MG,
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.value = 0x01,
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.gain = 292,
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},
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[2] = {
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.num = ST_MAGN_FS_AVL_12000MG,
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.value = 0x02,
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.gain = 438,
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},
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[3] = {
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.num = ST_MAGN_FS_AVL_16000MG,
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.value = 0x03,
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.gain = 584,
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},
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},
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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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.wai = 0x40,
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.wai_addr = 0x4f,
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.sensors_supported = {
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[0] = LSM303AGR_MAGN_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_magn_3_16bit_channels,
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.odr = {
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.addr = 0x60,
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.mask = 0x0c,
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.odr_avl = {
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{ .hz = 10, .value = 0x00 },
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{ .hz = 20, .value = 0x01 },
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{ .hz = 50, .value = 0x02 },
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{ .hz = 100, .value = 0x03 },
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},
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},
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.pw = {
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.addr = 0x60,
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.mask = 0x03,
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.value_on = 0x00,
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.value_off = 0x03,
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},
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.fs = {
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.fs_avl = {
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[0] = {
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.num = ST_MAGN_FS_AVL_15000MG,
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.gain = 1500,
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},
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},
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},
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.bdu = {
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.addr = 0x62,
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.mask = 0x10,
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},
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.drdy_irq = {
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.addr = 0x62,
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.mask_int1 = 0x01,
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.addr_ihl = 0x63,
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.mask_ihl = 0x04,
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.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
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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_magn_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 *mdata = 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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if ((ch->scan_index == ST_SENSORS_SCAN_Z) &&
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(mdata->current_fullscale->gain2 != 0))
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*val2 = mdata->current_fullscale->gain2;
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else
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*val2 = mdata->current_fullscale->gain;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SAMP_FREQ:
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*val = mdata->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 int st_magn_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val, int val2, 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_SCALE:
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err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
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break;
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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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err = -EINVAL;
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}
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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 ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available);
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static struct attribute *st_magn_attributes[] = {
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
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&iio_dev_attr_in_magn_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group st_magn_attribute_group = {
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.attrs = st_magn_attributes,
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};
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static const struct iio_info magn_info = {
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.driver_module = THIS_MODULE,
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.attrs = &st_magn_attribute_group,
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.read_raw = &st_magn_read_raw,
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.write_raw = &st_magn_write_raw,
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.debugfs_reg_access = &st_sensors_debugfs_reg_access,
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};
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#ifdef CONFIG_IIO_TRIGGER
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static const struct iio_trigger_ops st_magn_trigger_ops = {
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.owner = THIS_MODULE,
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.set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
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.validate_device = st_sensors_validate_device,
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};
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#define ST_MAGN_TRIGGER_OPS (&st_magn_trigger_ops)
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#else
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#define ST_MAGN_TRIGGER_OPS NULL
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#endif
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int st_magn_common_probe(struct iio_dev *indio_dev)
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{
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struct st_sensor_data *mdata = iio_priv(indio_dev);
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int irq = mdata->get_irq_data_ready(indio_dev);
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int err;
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indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &magn_info;
|
|
mutex_init(&mdata->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_magn_sensors_settings),
|
|
st_magn_sensors_settings);
|
|
if (err < 0)
|
|
goto st_magn_power_off;
|
|
|
|
mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
|
|
mdata->multiread_bit = mdata->sensor_settings->multi_read_bit;
|
|
indio_dev->channels = mdata->sensor_settings->ch;
|
|
indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
|
|
|
|
mdata->current_fullscale = (struct st_sensor_fullscale_avl *)
|
|
&mdata->sensor_settings->fs.fs_avl[0];
|
|
mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz;
|
|
|
|
err = st_sensors_init_sensor(indio_dev, NULL);
|
|
if (err < 0)
|
|
goto st_magn_power_off;
|
|
|
|
err = st_magn_allocate_ring(indio_dev);
|
|
if (err < 0)
|
|
goto st_magn_power_off;
|
|
|
|
if (irq > 0) {
|
|
err = st_sensors_allocate_trigger(indio_dev,
|
|
ST_MAGN_TRIGGER_OPS);
|
|
if (err < 0)
|
|
goto st_magn_probe_trigger_error;
|
|
}
|
|
|
|
err = iio_device_register(indio_dev);
|
|
if (err)
|
|
goto st_magn_device_register_error;
|
|
|
|
dev_info(&indio_dev->dev, "registered magnetometer %s\n",
|
|
indio_dev->name);
|
|
|
|
return 0;
|
|
|
|
st_magn_device_register_error:
|
|
if (irq > 0)
|
|
st_sensors_deallocate_trigger(indio_dev);
|
|
st_magn_probe_trigger_error:
|
|
st_magn_deallocate_ring(indio_dev);
|
|
st_magn_power_off:
|
|
st_sensors_power_disable(indio_dev);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(st_magn_common_probe);
|
|
|
|
void st_magn_common_remove(struct iio_dev *indio_dev)
|
|
{
|
|
struct st_sensor_data *mdata = iio_priv(indio_dev);
|
|
|
|
st_sensors_power_disable(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
if (mdata->get_irq_data_ready(indio_dev) > 0)
|
|
st_sensors_deallocate_trigger(indio_dev);
|
|
|
|
st_magn_deallocate_ring(indio_dev);
|
|
}
|
|
EXPORT_SYMBOL(st_magn_common_remove);
|
|
|
|
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
|
|
MODULE_LICENSE("GPL v2");
|