path: root/drivers/iio/accel/bma180.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
 *
 * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
 *
 * Support for BMA250 (c) Peter Meerwald <pmeerw@pmeerw.net>
 *
 * SPI is not supported by driver
 * BMA023/BMA150/SMB380: 7-bit I2C slave address 0x38
 * BMA180: 7-bit I2C slave address 0x40 or 0x41
 * BMA250: 7-bit I2C slave address 0x18 or 0x19
 */

#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

#define BMA180_DRV_NAME "bma180"
#define BMA180_IRQ_NAME "bma180_event"

enum chip_ids {
	BMA023,
	BMA150,
	BMA180,
	BMA250,
};

struct bma180_data;

struct bma180_part_info {
	u8 chip_id;
	const struct iio_chan_spec *channels;
	unsigned int num_channels;
	const int *scale_table;
	unsigned int num_scales;
	const int *bw_table;
	unsigned int num_bw;
	int temp_offset;

	u8 int_reset_reg, int_reset_mask;
	u8 sleep_reg, sleep_mask;
	u8 bw_reg, bw_mask, bw_offset;
	u8 scale_reg, scale_mask;
	u8 power_reg, power_mask, lowpower_val;
	u8 int_enable_reg, int_enable_mask;
	u8 softreset_reg, softreset_val;

	int (*chip_config)(struct bma180_data *data);
	void (*chip_disable)(struct bma180_data *data);
};

/* Register set */
#define BMA023_CTRL_REG0	0x0a
#define BMA023_CTRL_REG1	0x0b
#define BMA023_CTRL_REG2	0x14
#define BMA023_CTRL_REG3	0x15

#define BMA023_RANGE_MASK	GENMASK(4, 3) /* Range of accel values */
#define BMA023_BW_MASK		GENMASK(2, 0) /* Accel bandwidth */
#define BMA023_SLEEP		BIT(0)
#define BMA023_INT_RESET_MASK	BIT(6)
#define BMA023_NEW_DATA_INT	BIT(5) /* Intr every new accel data is ready */
#define BMA023_RESET_VAL	BIT(1)

#define BMA180_CHIP_ID		0x00 /* Need to distinguish BMA180 from other */
#define BMA180_ACC_X_LSB	0x02 /* First of 6 registers of accel data */
#define BMA180_TEMP		0x08
#define BMA180_CTRL_REG0	0x0d
#define BMA180_RESET		0x10
#define BMA180_BW_TCS		0x20
#define BMA180_CTRL_REG3	0x21
#define BMA180_TCO_Z		0x30
#define BMA180_OFFSET_LSB1	0x35

/* BMA180_CTRL_REG0 bits */
#define BMA180_DIS_WAKE_UP	BIT(0) /* Disable wake up mode */
#define BMA180_SLEEP		BIT(1) /* 1 - chip will sleep */
#define BMA180_EE_W		BIT(4) /* Unlock writing to addr from 0x20 */
#define BMA180_RESET_INT	BIT(6) /* Reset pending interrupts */

/* BMA180_CTRL_REG3 bits */
#define BMA180_NEW_DATA_INT	BIT(1) /* Intr every new accel data is ready */

/* BMA180_OFFSET_LSB1 skipping mode bit */
#define BMA180_SMP_SKIP		BIT(0)

/* Bit masks for registers bit fields */
#define BMA180_RANGE		0x0e /* Range of measured accel values */
#define BMA180_BW		0xf0 /* Accel bandwidth */
#define BMA180_MODE_CONFIG	0x03 /* Config operation modes */

/* We have to write this value in reset register to do soft reset */
#define BMA180_RESET_VAL	0xb6

#define BMA023_ID_REG_VAL	0x02
#define BMA180_ID_REG_VAL	0x03
#define BMA250_ID_REG_VAL	0x03

/* Chip power modes */
#define BMA180_LOW_POWER	0x03

#define BMA250_RANGE_REG	0x0f
#define BMA250_BW_REG		0x10
#define BMA250_POWER_REG	0x11
#define BMA250_RESET_REG	0x14
#define BMA250_INT_ENABLE_REG	0x17
#define BMA250_INT_MAP_REG	0x1a
#define BMA250_INT_RESET_REG	0x21

#define BMA250_RANGE_MASK	GENMASK(3, 0) /* Range of accel values */
#define BMA250_BW_MASK		GENMASK(4, 0) /* Accel bandwidth */
#define BMA250_BW_OFFSET	8
#define BMA250_SUSPEND_MASK	BIT(7) /* chip will sleep */
#define BMA250_LOWPOWER_MASK	BIT(6)
#define BMA250_DATA_INTEN_MASK	BIT(4)
#define BMA250_INT1_DATA_MASK	BIT(0)
#define BMA250_INT_RESET_MASK	BIT(7) /* Reset pending interrupts */

struct bma180_data {
	struct regulator *vdd_supply;
	struct regulator *vddio_supply;
	struct i2c_client *client;
	struct iio_trigger *trig;
	const struct bma180_part_info *part_info;
	struct iio_mount_matrix orientation;
	struct mutex mutex;
	bool sleep_state;
	int scale;
	int bw;
	bool pmode;
	/* Ensure timestamp is naturally aligned */
	struct {
		s16 chan[4];
		s64 timestamp __aligned(8);
	} scan;
};

enum bma180_chan {
	AXIS_X,
	AXIS_Y,
	AXIS_Z,
	TEMP
};

static int bma023_bw_table[] = { 25, 50, 100, 190, 375, 750, 1500 }; /* Hz */
static int bma023_scale_table[] = { 2452, 4903, 9709, };

static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };

static int bma250_bw_table[] = { 8, 16, 31, 63, 125, 250, 500, 1000 }; /* Hz */
static int bma250_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
	0, 0, 306458 };

static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan)
{
	int ret;

	if (data->sleep_state)
		return -EBUSY;

	switch (chan) {
	case TEMP:
		ret = i2c_smbus_read_byte_data(data->client, BMA180_TEMP);
		if (ret < 0)
			dev_err(&data->client->dev, "failed to read temp register\n");
		break;
	default:
		ret = i2c_smbus_read_