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Date: Sun, 26 Apr 2015 18:19:24 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Irina Tirdea <irina.tirdea@...el.com>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org
CC: linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald <pmeerw@...erw.net>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v2 1/4] iio: magn: Add support for BMC150 magnetometer
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@...ch.sensortec.com.
>
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
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@...ch.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;
> +};
> +
> +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@...el.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("BMC150 magnetometer driver");
>
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