On 23/04/15 19:34, Irina Tirdea wrote: > Add support for the Bosh BMC150 Magnetometer. Bosch. Good start :) > The specification can be downloaded from: > http://ae-bst.resource.bosch.com/media/products/dokumente/bmc150/BST-BMC150-DS000-04.pdf. > The chip contains both an accelerometer and a magnetometer. > This patch adds support only for the magnetometer part. > > The temperature compensation formulas are based on bmm050_api.c > authored by contact@xxxxxxxxxxxxxxxxxxx. > > Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx> Very nice. A couple of tiny bits inline. I'd like to leave this on the list for a few more days to see if anyone else has any comments to add to mine. We are very early in this cycle, so no rush! Thanks, Jonathan > --- > drivers/iio/magnetometer/Kconfig | 14 + > drivers/iio/magnetometer/Makefile | 2 + > drivers/iio/magnetometer/bmc150_magn.c | 986 +++++++++++++++++++++++++++++++++ > 3 files changed, 1002 insertions(+) > create mode 100644 drivers/iio/magnetometer/bmc150_magn.c > > diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig > index a5d6de7..008baca 100644 > --- a/drivers/iio/magnetometer/Kconfig > +++ b/drivers/iio/magnetometer/Kconfig > @@ -76,4 +76,18 @@ config IIO_ST_MAGN_SPI_3AXIS > depends on IIO_ST_MAGN_3AXIS > depends on IIO_ST_SENSORS_SPI > > +config BMC150_MAGN > + tristate "Bosch BMC150 Magnetometer Driver" > + depends on I2C > + select IIO_BUFFER > + select IIO_TRIGGERED_BUFFER > + help > + Say yes here to build support for the BMC150 magnetometer. > + > + Currently this only supports the device via an i2c interface. > + > + This is a combo module with both accelerometer and magnetometer. > + This driver is only implementing magnetometer part, which has > + its own address and register map. > + > endmenu > diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile > index 0f5d3c9..e2c3459 100644 > --- a/drivers/iio/magnetometer/Makefile > +++ b/drivers/iio/magnetometer/Makefile > @@ -13,3 +13,5 @@ st_magn-$(CONFIG_IIO_BUFFER) += st_magn_buffer.o > > obj-$(CONFIG_IIO_ST_MAGN_I2C_3AXIS) += st_magn_i2c.o > obj-$(CONFIG_IIO_ST_MAGN_SPI_3AXIS) += st_magn_spi.o > + > +obj-$(CONFIG_BMC150_MAGN) += bmc150_magn.o > diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c > new file mode 100644 > index 0000000..b8e4c90 > --- /dev/null > +++ b/drivers/iio/magnetometer/bmc150_magn.c > @@ -0,0 +1,986 @@ > +/* > + * Bosch BMC150 three-axis magnetic field sensor driver > + * > + * Copyright (c) 2015, Intel Corporation. > + * > + * This code is based on bmm050_api.c authored by contact@xxxxxxxxxxxxxxxxxxx: > + * > + * (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; > +}; > + > +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 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; > + 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; > + 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: > + mutex_lock(&data->mutex); > + ret = bmc150_magn_set_odr(data, val); > + mutex_unlock(&data->mutex); > + return ret; > + 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 IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2 6 8 10 15 20 25 30"); > + > +static struct attribute *bmc150_magn_attributes[] = { > + &iio_const_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), \ > + .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, \ > + .shift = 0, \ Don't bother specifying the shift as it'll be set to 0 anyway. (also default in my mind will always be zero anyway for a shift so it doesn't serve a documentation purpose either!) > + .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", ret); > + ret = -ENODEV; > + goto err_poweroff; > + } > + dev_dbg(&data->client->dev, "Chip id %x\n", ret); > + > + 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_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 -EAGAIN; Is EAGAIN a sensible error? Would returning ret not make more sense? > + } > + > + 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@xxxxxxxxx>"); > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("BMC150 magnetometer driver"); > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
