| /* |
| * Bosch BMC150 three-axis magnetic field sensor driver |
| * |
| * Copyright (c) 2015, Intel Corporation. |
| * |
| * This code is based on bmm050_api.c authored by contact@bosch.sensortec.com: |
| * |
| * (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/acpi.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/pm.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| #include <linux/iio/buffer.h> |
| #include <linux/iio/events.h> |
| #include <linux/iio/trigger.h> |
| #include <linux/iio/trigger_consumer.h> |
| #include <linux/iio/triggered_buffer.h> |
| #include <linux/regmap.h> |
| |
| #define BMC150_MAGN_DRV_NAME "bmc150_magn" |
| #define BMC150_MAGN_IRQ_NAME "bmc150_magn_event" |
| #define BMC150_MAGN_GPIO_INT "interrupt" |
| |
| #define BMC150_MAGN_REG_CHIP_ID 0x40 |
| #define BMC150_MAGN_CHIP_ID_VAL 0x32 |
| |
| #define BMC150_MAGN_REG_X_L 0x42 |
| #define BMC150_MAGN_REG_X_M 0x43 |
| #define BMC150_MAGN_REG_Y_L 0x44 |
| #define BMC150_MAGN_REG_Y_M 0x45 |
| #define BMC150_MAGN_SHIFT_XY_L 3 |
| #define BMC150_MAGN_REG_Z_L 0x46 |
| #define BMC150_MAGN_REG_Z_M 0x47 |
| #define BMC150_MAGN_SHIFT_Z_L 1 |
| #define BMC150_MAGN_REG_RHALL_L 0x48 |
| #define BMC150_MAGN_REG_RHALL_M 0x49 |
| #define BMC150_MAGN_SHIFT_RHALL_L 2 |
| |
| #define BMC150_MAGN_REG_INT_STATUS 0x4A |
| |
| #define BMC150_MAGN_REG_POWER 0x4B |
| #define BMC150_MAGN_MASK_POWER_CTL BIT(0) |
| |
| #define BMC150_MAGN_REG_OPMODE_ODR 0x4C |
| #define BMC150_MAGN_MASK_OPMODE GENMASK(2, 1) |
| #define BMC150_MAGN_SHIFT_OPMODE 1 |
| #define BMC150_MAGN_MODE_NORMAL 0x00 |
| #define BMC150_MAGN_MODE_FORCED 0x01 |
| #define BMC150_MAGN_MODE_SLEEP 0x03 |
| #define BMC150_MAGN_MASK_ODR GENMASK(5, 3) |
| #define BMC150_MAGN_SHIFT_ODR 3 |
| |
| #define BMC150_MAGN_REG_INT 0x4D |
| |
| #define BMC150_MAGN_REG_INT_DRDY 0x4E |
| #define BMC150_MAGN_MASK_DRDY_EN BIT(7) |
| #define BMC150_MAGN_SHIFT_DRDY_EN 7 |
| #define BMC150_MAGN_MASK_DRDY_INT3 BIT(6) |
| #define BMC150_MAGN_MASK_DRDY_Z_EN BIT(5) |
| #define BMC150_MAGN_MASK_DRDY_Y_EN BIT(4) |
| #define BMC150_MAGN_MASK_DRDY_X_EN BIT(3) |
| #define BMC150_MAGN_MASK_DRDY_DR_POLARITY BIT(2) |
| #define BMC150_MAGN_MASK_DRDY_LATCHING BIT(1) |
| #define BMC150_MAGN_MASK_DRDY_INT3_POLARITY BIT(0) |
| |
| #define BMC150_MAGN_REG_LOW_THRESH 0x4F |
| #define BMC150_MAGN_REG_HIGH_THRESH 0x50 |
| #define BMC150_MAGN_REG_REP_XY 0x51 |
| #define BMC150_MAGN_REG_REP_Z 0x52 |
| |
| #define BMC150_MAGN_REG_TRIM_START 0x5D |
| #define BMC150_MAGN_REG_TRIM_END 0x71 |
| |
| #define BMC150_MAGN_XY_OVERFLOW_VAL -4096 |
| #define BMC150_MAGN_Z_OVERFLOW_VAL -16384 |
| |
| /* Time from SUSPEND to SLEEP */ |
| #define BMC150_MAGN_START_UP_TIME_MS 3 |
| |
| #define BMC150_MAGN_AUTO_SUSPEND_DELAY_MS 2000 |
| |
| #define BMC150_MAGN_REGVAL_TO_REPXY(regval) (((regval) * 2) + 1) |
| #define BMC150_MAGN_REGVAL_TO_REPZ(regval) ((regval) + 1) |
| #define BMC150_MAGN_REPXY_TO_REGVAL(rep) (((rep) - 1) / 2) |
| #define BMC150_MAGN_REPZ_TO_REGVAL(rep) ((rep) - 1) |
| |
| enum bmc150_magn_axis { |
| AXIS_X, |
| AXIS_Y, |
| AXIS_Z, |
| RHALL, |
| AXIS_XYZ_MAX = RHALL, |
| AXIS_XYZR_MAX, |
| }; |
| |
| enum bmc150_magn_power_modes { |
| BMC150_MAGN_POWER_MODE_SUSPEND, |
| BMC150_MAGN_POWER_MODE_SLEEP, |
| BMC150_MAGN_POWER_MODE_NORMAL, |
| }; |
| |
| struct bmc150_magn_trim_regs { |
| s8 x1; |
| s8 y1; |
| __le16 reserved1; |
| u8 reserved2; |
| __le16 z4; |
| s8 x2; |
| s8 y2; |
| __le16 reserved3; |
| __le16 z2; |
| __le16 z1; |
| __le16 xyz1; |
| __le16 z3; |
| s8 xy2; |
| u8 xy1; |
| } __packed; |
| |
| struct bmc150_magn_data { |
| struct i2c_client *client; |
| /* |
| * 1. Protect this structure. |
| * 2. Serialize sequences that power on/off the device and access HW. |
| */ |
| struct mutex mutex; |
| struct regmap *regmap; |
| /* 4 x 32 bits for x, y z, 4 bytes align, 64 bits timestamp */ |
| s32 buffer[6]; |
| struct iio_trigger *dready_trig; |
| bool dready_trigger_on; |
| int max_odr; |
| }; |
| |
| static const struct { |
| int freq; |
| u8 reg_val; |
| } bmc150_magn_samp_freq_table[] = { {2, 0x01}, |
| {6, 0x02}, |
| {8, 0x03}, |
| {10, 0x00}, |
| {15, 0x04}, |
| {20, 0x05}, |
| {25, 0x06}, |
| {30, 0x07} }; |
| |
| enum bmc150_magn_presets { |
| LOW_POWER_PRESET, |
| REGULAR_PRESET, |
| ENHANCED_REGULAR_PRESET, |
| HIGH_ACCURACY_PRESET |
| }; |
| |
| static const struct bmc150_magn_preset { |
| u8 rep_xy; |
| u8 rep_z; |
| u8 odr; |
| } bmc150_magn_presets_table[] = { |
| [LOW_POWER_PRESET] = {3, 3, 10}, |
| [REGULAR_PRESET] = {9, 15, 10}, |
| [ENHANCED_REGULAR_PRESET] = {15, 27, 10}, |
| [HIGH_ACCURACY_PRESET] = {47, 83, 20}, |
| }; |
| |
| #define BMC150_MAGN_DEFAULT_PRESET REGULAR_PRESET |
| |
| static bool bmc150_magn_is_writeable_reg(struct device *dev, unsigned int reg) |
| { |
| switch (reg) { |
| case BMC150_MAGN_REG_POWER: |
| case BMC150_MAGN_REG_OPMODE_ODR: |
| case BMC150_MAGN_REG_INT: |
| case BMC150_MAGN_REG_INT_DRDY: |
| case BMC150_MAGN_REG_LOW_THRESH: |
| case BMC150_MAGN_REG_HIGH_THRESH: |
| case BMC150_MAGN_REG_REP_XY: |
| case BMC150_MAGN_REG_REP_Z: |
| return true; |
| default: |
| return false; |
| }; |
| } |
| |
| static bool bmc150_magn_is_volatile_reg(struct device *dev, unsigned int reg) |
| { |
| switch (reg) { |
| case BMC150_MAGN_REG_X_L: |
| case BMC150_MAGN_REG_X_M: |
| case BMC150_MAGN_REG_Y_L: |
| case BMC150_MAGN_REG_Y_M: |
| case BMC150_MAGN_REG_Z_L: |
| case BMC150_MAGN_REG_Z_M: |
| case BMC150_MAGN_REG_RHALL_L: |
| case BMC150_MAGN_REG_RHALL_M: |
| case BMC150_MAGN_REG_INT_STATUS: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static const struct regmap_config bmc150_magn_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| |
| .max_register = BMC150_MAGN_REG_TRIM_END, |
| .cache_type = REGCACHE_RBTREE, |
| |
| .writeable_reg = bmc150_magn_is_writeable_reg, |
| .volatile_reg = bmc150_magn_is_volatile_reg, |
| }; |
| |
| static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data, |
| enum bmc150_magn_power_modes mode, |
| bool state) |
| { |
| int ret; |
| |
| switch (mode) { |
| case BMC150_MAGN_POWER_MODE_SUSPEND: |
| ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_POWER, |
| BMC150_MAGN_MASK_POWER_CTL, !state); |
| if (ret < 0) |
| return ret; |
| usleep_range(BMC150_MAGN_START_UP_TIME_MS * 1000, 20000); |
| return 0; |
| case BMC150_MAGN_POWER_MODE_SLEEP: |
| return regmap_update_bits(data->regmap, |
| BMC150_MAGN_REG_OPMODE_ODR, |
| BMC150_MAGN_MASK_OPMODE, |
| BMC150_MAGN_MODE_SLEEP << |
| BMC150_MAGN_SHIFT_OPMODE); |
| case BMC150_MAGN_POWER_MODE_NORMAL: |
| return regmap_update_bits(data->regmap, |
| BMC150_MAGN_REG_OPMODE_ODR, |
| BMC150_MAGN_MASK_OPMODE, |
| BMC150_MAGN_MODE_NORMAL << |
| BMC150_MAGN_SHIFT_OPMODE); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on) |
| { |
| #ifdef CONFIG_PM |
| int ret; |
| |
| if (on) { |
| ret = pm_runtime_get_sync(&data->client->dev); |
| } else { |
| pm_runtime_mark_last_busy(&data->client->dev); |
| ret = pm_runtime_put_autosuspend(&data->client->dev); |
| } |
| |
| if (ret < 0) { |
| dev_err(&data->client->dev, |
| "failed to change power state to %d\n", on); |
| if (on) |
| pm_runtime_put_noidle(&data->client->dev); |
| |
| return ret; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val) |
| { |
| int ret, reg_val; |
| u8 i, odr_val; |
| |
| ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, ®_val); |
| if (ret < 0) |
| return ret; |
| odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR; |
| |
| for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) |
| if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) { |
| *val = bmc150_magn_samp_freq_table[i].freq; |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val) |
| { |
| int ret; |
| u8 i; |
| |
| for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) { |
| if (bmc150_magn_samp_freq_table[i].freq == val) { |
| ret = regmap_update_bits(data->regmap, |
| BMC150_MAGN_REG_OPMODE_ODR, |
| BMC150_MAGN_MASK_ODR, |
| bmc150_magn_samp_freq_table[i]. |
| reg_val << |
| BMC150_MAGN_SHIFT_ODR); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int bmc150_magn_set_max_odr(struct bmc150_magn_data *data, int rep_xy, |
| int rep_z, int odr) |
| { |
| int ret, reg_val, max_odr; |
| |
| if (rep_xy <= 0) { |
| ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY, |
| ®_val); |
| if (ret < 0) |
| return ret; |
| rep_xy = BMC150_MAGN_REGVAL_TO_REPXY(reg_val); |
| } |
| if (rep_z <= 0) { |
| ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z, |
| ®_val); |
| if (ret < 0) |
| return ret; |
| rep_z = BMC150_MAGN_REGVAL_TO_REPZ(reg_val); |
| } |
| if (odr <= 0) { |
| ret = bmc150_magn_get_odr(data, &odr); |
| if (ret < 0) |
| return ret; |
| } |
| /* the maximum selectable read-out frequency from datasheet */ |
| max_odr = 1000000 / (145 * rep_xy + 500 * rep_z + 980); |
| if (odr > max_odr) { |
| dev_err(&data->client->dev, |
| "Can't set oversampling with sampling freq %d\n", |
| odr); |
| return -EINVAL; |
| } |
| data->max_odr = max_odr; |
| |
| return 0; |
| } |
| |
| static s32 bmc150_magn_compensate_x(struct bmc150_magn_trim_regs *tregs, s16 x, |
| u16 rhall) |
| { |
| s16 val; |
| u16 xyz1 = le16_to_cpu(tregs->xyz1); |
| |
| if (x == BMC150_MAGN_XY_OVERFLOW_VAL) |
| return S32_MIN; |
| |
| if (!rhall) |
| rhall = xyz1; |
| |
| val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000))); |
| val = ((s16)((((s32)x) * ((((((((s32)tregs->xy2) * ((((s32)val) * |
| ((s32)val)) >> 7)) + (((s32)val) * |
| ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) * |
| ((s32)(((s16)tregs->x2) + ((s16)0xA0)))) >> 12)) >> 13)) + |
| (((s16)tregs->x1) << 3); |
| |
| return (s32)val; |
| } |
| |
| static s32 bmc150_magn_compensate_y(struct bmc150_magn_trim_regs *tregs, s16 y, |
| u16 rhall) |
| { |
| s16 val; |
| u16 xyz1 = le16_to_cpu(tregs->xyz1); |
| |
| if (y == BMC150_MAGN_XY_OVERFLOW_VAL) |
| return S32_MIN; |
| |
| if (!rhall) |
| rhall = xyz1; |
| |
| val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000))); |
| val = ((s16)((((s32)y) * ((((((((s32)tregs->xy2) * ((((s32)val) * |
| ((s32)val)) >> 7)) + (((s32)val) * |
| ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) * |
| ((s32)(((s16)tregs->y2) + ((s16)0xA0)))) >> 12)) >> 13)) + |
| (((s16)tregs->y1) << 3); |
| |
| return (s32)val; |
| } |
| |
| static s32 bmc150_magn_compensate_z(struct bmc150_magn_trim_regs *tregs, s16 z, |
| u16 rhall) |
| { |
| s32 val; |
| u16 xyz1 = le16_to_cpu(tregs->xyz1); |
| u16 z1 = le16_to_cpu(tregs->z1); |
| s16 z2 = le16_to_cpu(tregs->z2); |
| s16 z3 = le16_to_cpu(tregs->z3); |
| s16 z4 = le16_to_cpu(tregs->z4); |
| |
| if (z == BMC150_MAGN_Z_OVERFLOW_VAL) |
| return S32_MIN; |
| |
| val = (((((s32)(z - z4)) << 15) - ((((s32)z3) * ((s32)(((s16)rhall) - |
| ((s16)xyz1)))) >> 2)) / (z2 + ((s16)(((((s32)z1) * |
| ((((s16)rhall) << 1))) + (1 << 15)) >> 16)))); |
| |
| return val; |
| } |
| |
| static int bmc150_magn_read_xyz(struct bmc150_magn_data *data, s32 *buffer) |
| { |
| int ret; |
| __le16 values[AXIS_XYZR_MAX]; |
| s16 raw_x, raw_y, raw_z; |
| u16 rhall; |
| struct bmc150_magn_trim_regs tregs; |
| |
| ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_X_L, |
| values, sizeof(values)); |
| if (ret < 0) |
| return ret; |
| |
| raw_x = (s16)le16_to_cpu(values[AXIS_X]) >> BMC150_MAGN_SHIFT_XY_L; |
| raw_y = (s16)le16_to_cpu(values[AXIS_Y]) >> BMC150_MAGN_SHIFT_XY_L; |
| raw_z = (s16)le16_to_cpu(values[AXIS_Z]) >> BMC150_MAGN_SHIFT_Z_L; |
| rhall = le16_to_cpu(values[RHALL]) >> BMC150_MAGN_SHIFT_RHALL_L; |
| |
| ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_TRIM_START, |
| &tregs, sizeof(tregs)); |
| if (ret < 0) |
| return ret; |
| |
| buffer[AXIS_X] = bmc150_magn_compensate_x(&tregs, raw_x, rhall); |
| buffer[AXIS_Y] = bmc150_magn_compensate_y(&tregs, raw_y, rhall); |
| buffer[AXIS_Z] = bmc150_magn_compensate_z(&tregs, raw_z, rhall); |
| |
| return 0; |
| } |
| |
| static int bmc150_magn_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, long mask) |
| { |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret, tmp; |
| s32 values[AXIS_XYZ_MAX]; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| if (iio_buffer_enabled(indio_dev)) |
| return -EBUSY; |
| mutex_lock(&data->mutex); |
| |
| ret = bmc150_magn_set_power_state(data, true); |
| if (ret < 0) { |
| mutex_unlock(&data->mutex); |
| return ret; |
| } |
| |
| ret = bmc150_magn_read_xyz(data, values); |
| if (ret < 0) { |
| bmc150_magn_set_power_state(data, false); |
| mutex_unlock(&data->mutex); |
| return ret; |
| } |
| *val = values[chan->scan_index]; |
| |
| ret = bmc150_magn_set_power_state(data, false); |
| if (ret < 0) { |
| mutex_unlock(&data->mutex); |
| return ret; |
| } |
| |
| mutex_unlock(&data->mutex); |
| return IIO_VAL_INT; |
| case IIO_CHAN_INFO_SCALE: |
| /* |
| * The API/driver performs an off-chip temperature |
| * compensation and outputs x/y/z magnetic field data in |
| * 16 LSB/uT to the upper application layer. |
| */ |
| *val = 0; |
| *val2 = 625; |
| return IIO_VAL_INT_PLUS_MICRO; |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| ret = bmc150_magn_get_odr(data, val); |
| if (ret < 0) |
| return ret; |
| return IIO_VAL_INT; |
| case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
| switch (chan->channel2) { |
| case IIO_MOD_X: |
| case IIO_MOD_Y: |
| ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY, |
| &tmp); |
| if (ret < 0) |
| return ret; |
| *val = BMC150_MAGN_REGVAL_TO_REPXY(tmp); |
| return IIO_VAL_INT; |
| case IIO_MOD_Z: |
| ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z, |
| &tmp); |
| if (ret < 0) |
| return ret; |
| *val = BMC150_MAGN_REGVAL_TO_REPZ(tmp); |
| return IIO_VAL_INT; |
| default: |
| return -EINVAL; |
| } |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int bmc150_magn_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, long mask) |
| { |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| if (val > data->max_odr) |
| return -EINVAL; |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_set_odr(data, val); |
| mutex_unlock(&data->mutex); |
| return ret; |
| case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
| switch (chan->channel2) { |
| case IIO_MOD_X: |
| case IIO_MOD_Y: |
| if (val < 1 || val > 511) |
| return -EINVAL; |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_set_max_odr(data, val, 0, 0); |
| if (ret < 0) { |
| mutex_unlock(&data->mutex); |
| return ret; |
| } |
| ret = regmap_update_bits(data->regmap, |
| BMC150_MAGN_REG_REP_XY, |
| 0xFF, |
| BMC150_MAGN_REPXY_TO_REGVAL |
| (val)); |
| mutex_unlock(&data->mutex); |
| return ret; |
| case IIO_MOD_Z: |
| if (val < 1 || val > 256) |
| return -EINVAL; |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_set_max_odr(data, 0, val, 0); |
| if (ret < 0) { |
| mutex_unlock(&data->mutex); |
| return ret; |
| } |
| ret = regmap_update_bits(data->regmap, |
| BMC150_MAGN_REG_REP_Z, |
| 0xFF, |
| BMC150_MAGN_REPZ_TO_REGVAL |
| (val)); |
| mutex_unlock(&data->mutex); |
| return ret; |
| default: |
| return -EINVAL; |
| } |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int bmc150_magn_validate_trigger(struct iio_dev *indio_dev, |
| struct iio_trigger *trig) |
| { |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| |
| if (data->dready_trig != trig) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| size_t len = 0; |
| u8 i; |
| |
| for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) { |
| if (bmc150_magn_samp_freq_table[i].freq > data->max_odr) |
| break; |
| len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", |
| bmc150_magn_samp_freq_table[i].freq); |
| } |
| /* replace last space with a newline */ |
| buf[len - 1] = '\n'; |
| |
| return len; |
| } |
| |
| static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail); |
| |
| static struct attribute *bmc150_magn_attributes[] = { |
| &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group bmc150_magn_attrs_group = { |
| .attrs = bmc150_magn_attributes, |
| }; |
| |
| #define BMC150_MAGN_CHANNEL(_axis) { \ |
| .type = IIO_MAGN, \ |
| .modified = 1, \ |
| .channel2 = IIO_MOD_##_axis, \ |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
| BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ |
| .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ |
| BIT(IIO_CHAN_INFO_SCALE), \ |
| .scan_index = AXIS_##_axis, \ |
| .scan_type = { \ |
| .sign = 's', \ |
| .realbits = 32, \ |
| .storagebits = 32, \ |
| .endianness = IIO_LE \ |
| }, \ |
| } |
| |
| static const struct iio_chan_spec bmc150_magn_channels[] = { |
| BMC150_MAGN_CHANNEL(X), |
| BMC150_MAGN_CHANNEL(Y), |
| BMC150_MAGN_CHANNEL(Z), |
| IIO_CHAN_SOFT_TIMESTAMP(3), |
| }; |
| |
| static const struct iio_info bmc150_magn_info = { |
| .attrs = &bmc150_magn_attrs_group, |
| .read_raw = bmc150_magn_read_raw, |
| .write_raw = bmc150_magn_write_raw, |
| .validate_trigger = bmc150_magn_validate_trigger, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static const unsigned long bmc150_magn_scan_masks[] = {0x07, 0}; |
| |
| static irqreturn_t bmc150_magn_trigger_handler(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_read_xyz(data, data->buffer); |
| mutex_unlock(&data->mutex); |
| if (ret < 0) |
| goto err; |
| |
| iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
| pf->timestamp); |
| |
| err: |
| iio_trigger_notify_done(data->dready_trig); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int bmc150_magn_init(struct bmc150_magn_data *data) |
| { |
| int ret, chip_id; |
| struct bmc150_magn_preset preset; |
| |
| ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, |
| false); |
| if (ret < 0) { |
| dev_err(&data->client->dev, |
| "Failed to bring up device from suspend mode\n"); |
| return ret; |
| } |
| |
| ret = regmap_read(data->regmap, BMC150_MAGN_REG_CHIP_ID, &chip_id); |
| if (ret < 0) { |
| dev_err(&data->client->dev, "Failed reading chip id\n"); |
| goto err_poweroff; |
| } |
| if (chip_id != BMC150_MAGN_CHIP_ID_VAL) { |
| dev_err(&data->client->dev, "Invalid chip id 0x%x\n", chip_id); |
| ret = -ENODEV; |
| goto err_poweroff; |
| } |
| dev_dbg(&data->client->dev, "Chip id %x\n", chip_id); |
| |
| preset = bmc150_magn_presets_table[BMC150_MAGN_DEFAULT_PRESET]; |
| ret = bmc150_magn_set_odr(data, preset.odr); |
| if (ret < 0) { |
| dev_err(&data->client->dev, "Failed to set ODR to %d\n", |
| preset.odr); |
| goto err_poweroff; |
| } |
| |
| ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_XY, |
| BMC150_MAGN_REPXY_TO_REGVAL(preset.rep_xy)); |
| if (ret < 0) { |
| dev_err(&data->client->dev, "Failed to set REP XY to %d\n", |
| preset.rep_xy); |
| goto err_poweroff; |
| } |
| |
| ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_Z, |
| BMC150_MAGN_REPZ_TO_REGVAL(preset.rep_z)); |
| if (ret < 0) { |
| dev_err(&data->client->dev, "Failed to set REP Z to %d\n", |
| preset.rep_z); |
| goto err_poweroff; |
| } |
| |
| ret = bmc150_magn_set_max_odr(data, preset.rep_xy, preset.rep_z, |
| preset.odr); |
| if (ret < 0) |
| goto err_poweroff; |
| |
| ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL, |
| true); |
| if (ret < 0) { |
| dev_err(&data->client->dev, "Failed to power on device\n"); |
| goto err_poweroff; |
| } |
| |
| return 0; |
| |
| err_poweroff: |
| bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true); |
| return ret; |
| } |
| |
| static int bmc150_magn_reset_intr(struct bmc150_magn_data *data) |
| { |
| int tmp; |
| |
| /* |
| * Data Ready (DRDY) is always cleared after |
| * readout of data registers ends. |
| */ |
| return regmap_read(data->regmap, BMC150_MAGN_REG_X_L, &tmp); |
| } |
| |
| static int bmc150_magn_trig_try_reen(struct iio_trigger *trig) |
| { |
| struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| if (!data->dready_trigger_on) |
| return 0; |
| |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_reset_intr(data); |
| mutex_unlock(&data->mutex); |
| |
| return ret; |
| } |
| |
| static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig, |
| bool state) |
| { |
| struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret = 0; |
| |
| mutex_lock(&data->mutex); |
| if (state == data->dready_trigger_on) |
| goto err_unlock; |
| |
| ret = bmc150_magn_set_power_state(data, state); |
| if (ret < 0) |
| goto err_unlock; |
| |
| ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY, |
| BMC150_MAGN_MASK_DRDY_EN, |
| state << BMC150_MAGN_SHIFT_DRDY_EN); |
| if (ret < 0) |
| goto err_poweroff; |
| |
| data->dready_trigger_on = state; |
| |
| if (state) { |
| ret = bmc150_magn_reset_intr(data); |
| if (ret < 0) |
| goto err_poweroff; |
| } |
| mutex_unlock(&data->mutex); |
| |
| return 0; |
| |
| err_poweroff: |
| bmc150_magn_set_power_state(data, false); |
| err_unlock: |
| mutex_unlock(&data->mutex); |
| return ret; |
| } |
| |
| static const struct iio_trigger_ops bmc150_magn_trigger_ops = { |
| .set_trigger_state = bmc150_magn_data_rdy_trigger_set_state, |
| .try_reenable = bmc150_magn_trig_try_reen, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int bmc150_magn_gpio_probe(struct i2c_client *client) |
| { |
| struct device *dev; |
| struct gpio_desc *gpio; |
| int ret; |
| |
| if (!client) |
| return -EINVAL; |
| |
| dev = &client->dev; |
| |
| /* data ready GPIO interrupt pin */ |
| gpio = devm_gpiod_get_index(dev, BMC150_MAGN_GPIO_INT, 0); |
| if (IS_ERR(gpio)) { |
| dev_err(dev, "ACPI GPIO get index failed\n"); |
| return PTR_ERR(gpio); |
| } |
| |
| ret = gpiod_direction_input(gpio); |
| if (ret) |
| return ret; |
| |
| ret = gpiod_to_irq(gpio); |
| |
| dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret); |
| |
| return ret; |
| } |
| |
| static const char *bmc150_magn_match_acpi_device(struct device *dev) |
| { |
| const struct acpi_device_id *id; |
| |
| id = acpi_match_device(dev->driver->acpi_match_table, dev); |
| if (!id) |
| return NULL; |
| |
| return dev_name(dev); |
| } |
| |
| static int bmc150_magn_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct bmc150_magn_data *data; |
| struct iio_dev *indio_dev; |
| const char *name = NULL; |
| int ret; |
| |
| indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| if (!indio_dev) |
| return -ENOMEM; |
| |
| data = iio_priv(indio_dev); |
| i2c_set_clientdata(client, indio_dev); |
| data->client = client; |
| |
| if (id) |
| name = id->name; |
| else if (ACPI_HANDLE(&client->dev)) |
| name = bmc150_magn_match_acpi_device(&client->dev); |
| else |
| return -ENOSYS; |
| |
| mutex_init(&data->mutex); |
| data->regmap = devm_regmap_init_i2c(client, &bmc150_magn_regmap_config); |
| if (IS_ERR(data->regmap)) { |
| dev_err(&client->dev, "Failed to allocate register map\n"); |
| return PTR_ERR(data->regmap); |
| } |
| |
| ret = bmc150_magn_init(data); |
| if (ret < 0) |
| return ret; |
| |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->channels = bmc150_magn_channels; |
| indio_dev->num_channels = ARRAY_SIZE(bmc150_magn_channels); |
| indio_dev->available_scan_masks = bmc150_magn_scan_masks; |
| indio_dev->name = name; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->info = &bmc150_magn_info; |
| |
| if (client->irq <= 0) |
| client->irq = bmc150_magn_gpio_probe(client); |
| |
| if (client->irq > 0) { |
| data->dready_trig = devm_iio_trigger_alloc(&client->dev, |
| "%s-dev%d", |
| indio_dev->name, |
| indio_dev->id); |
| if (!data->dready_trig) { |
| ret = -ENOMEM; |
| dev_err(&client->dev, "iio trigger alloc failed\n"); |
| goto err_poweroff; |
| } |
| |
| data->dready_trig->dev.parent = &client->dev; |
| data->dready_trig->ops = &bmc150_magn_trigger_ops; |
| iio_trigger_set_drvdata(data->dready_trig, indio_dev); |
| ret = iio_trigger_register(data->dready_trig); |
| if (ret) { |
| dev_err(&client->dev, "iio trigger register failed\n"); |
| goto err_poweroff; |
| } |
| |
| ret = iio_triggered_buffer_setup(indio_dev, |
| &iio_pollfunc_store_time, |
| bmc150_magn_trigger_handler, |
| NULL); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "iio triggered buffer setup failed\n"); |
| goto err_trigger_unregister; |
| } |
| |
| ret = request_threaded_irq(client->irq, |
| iio_trigger_generic_data_rdy_poll, |
| NULL, |
| IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
| BMC150_MAGN_IRQ_NAME, |
| data->dready_trig); |
| if (ret < 0) { |
| dev_err(&client->dev, "request irq %d failed\n", |
| client->irq); |
| goto err_buffer_cleanup; |
| } |
| } |
| |
| ret = iio_device_register(indio_dev); |
| if (ret < 0) { |
| dev_err(&client->dev, "unable to register iio device\n"); |
| goto err_free_irq; |
| } |
| |
| ret = pm_runtime_set_active(&client->dev); |
| if (ret) |
| goto err_iio_unregister; |
| |
| pm_runtime_enable(&client->dev); |
| pm_runtime_set_autosuspend_delay(&client->dev, |
| BMC150_MAGN_AUTO_SUSPEND_DELAY_MS); |
| pm_runtime_use_autosuspend(&client->dev); |
| |
| dev_dbg(&indio_dev->dev, "Registered device %s\n", name); |
| |
| return 0; |
| |
| err_iio_unregister: |
| iio_device_unregister(indio_dev); |
| err_free_irq: |
| if (client->irq > 0) |
| free_irq(client->irq, data->dready_trig); |
| err_buffer_cleanup: |
| if (data->dready_trig) |
| iio_triggered_buffer_cleanup(indio_dev); |
| err_trigger_unregister: |
| if (data->dready_trig) |
| iio_trigger_unregister(data->dready_trig); |
| err_poweroff: |
| bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true); |
| return ret; |
| } |
| |
| static int bmc150_magn_remove(struct i2c_client *client) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| |
| pm_runtime_disable(&client->dev); |
| pm_runtime_set_suspended(&client->dev); |
| pm_runtime_put_noidle(&client->dev); |
| |
| iio_device_unregister(indio_dev); |
| |
| if (client->irq > 0) |
| free_irq(data->client->irq, data->dready_trig); |
| |
| if (data->dready_trig) { |
| iio_triggered_buffer_cleanup(indio_dev); |
| iio_trigger_unregister(data->dready_trig); |
| } |
| |
| mutex_lock(&data->mutex); |
| bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true); |
| mutex_unlock(&data->mutex); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int bmc150_magn_runtime_suspend(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP, |
| true); |
| mutex_unlock(&data->mutex); |
| if (ret < 0) { |
| dev_err(&data->client->dev, "powering off device failed\n"); |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int bmc150_magn_runtime_resume(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| |
| return bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL, |
| true); |
| } |
| #endif |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int bmc150_magn_suspend(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP, |
| true); |
| mutex_unlock(&data->mutex); |
| |
| return ret; |
| } |
| |
| static int bmc150_magn_resume(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct bmc150_magn_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&data->mutex); |
| ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL, |
| true); |
| mutex_unlock(&data->mutex); |
| |
| return ret; |
| } |
| #endif |
| |
| static const struct dev_pm_ops bmc150_magn_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(bmc150_magn_suspend, bmc150_magn_resume) |
| SET_RUNTIME_PM_OPS(bmc150_magn_runtime_suspend, |
| bmc150_magn_runtime_resume, NULL) |
| }; |
| |
| static const struct acpi_device_id bmc150_magn_acpi_match[] = { |
| {"BMC150B", 0}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(acpi, bmc150_magn_acpi_match); |
| |
| static const struct i2c_device_id bmc150_magn_id[] = { |
| {"bmc150_magn", 0}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(i2c, bmc150_magn_id); |
| |
| static struct i2c_driver bmc150_magn_driver = { |
| .driver = { |
| .name = BMC150_MAGN_DRV_NAME, |
| .acpi_match_table = ACPI_PTR(bmc150_magn_acpi_match), |
| .pm = &bmc150_magn_pm_ops, |
| }, |
| .probe = bmc150_magn_probe, |
| .remove = bmc150_magn_remove, |
| .id_table = bmc150_magn_id, |
| }; |
| module_i2c_driver(bmc150_magn_driver); |
| |
| MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("BMC150 magnetometer driver"); |