Commit 2017cff2 authored by Peter Meerwald's avatar Peter Meerwald Committed by Jonathan Cameron
Browse files

iio:bma180: Add BMA250 chip support 

the BMA250 has only 10-bit resolution; while the data readout registers
have identical layout, the configuration is completely different compared
to the BMA180

datasheet: http://ae-bst.resource.bosch.com/media/products/dokumente/bma250/BST-BMA250-DS002-05.pdf



Signed-off-by: default avatarPeter Meerwald <pmeerw@pmeerw.net>
Cc: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 402a324e

drivers/iio/accel/Kconfig

+3 −3
Original line number Diff line number Diff line
@@ -6,13 +6,13 @@ 
menu "Accelerometers"



config BMA180

	tristate "Bosch BMA180 3-Axis Accelerometer Driver"

	tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"

	depends on I2C

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	help

	  Say Y here if you want to build a driver for the Bosch BMA180

	  triaxial acceleration sensor.

	  Say Y here if you want to build a driver for the Bosch BMA180 or

	  BMA250 triaxial acceleration sensor.



	  To compile this driver as a module, choose M here: the

	  module will be called bma180.

drivers/iio/accel/bma180.c

+125 −31
Original line number Diff line number Diff line
@@ -3,9 +3,15 @@ 
 *

 * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>

 *

 * Support for BMA250 (c) Peter Meerwald <pmeerw@pmeerw.net>

 *

 * This file is subject to the terms and conditions of version 2 of

 * the GNU General Public License.  See the file COPYING in the main

 * directory of this archive for more details.

 *

 * SPI is not supported by driver

 * BMA180: 7-bit I2C slave address 0x40 or 0x41

 * BMA250: 7-bit I2C slave address 0x18 or 0x19

 */



#include <linux/module.h>
@@ -28,6 +34,7 @@ 


enum {

	BMA180,

	BMA250,

};



struct bma180_data;
@@ -39,6 +46,15 @@ struct bma180_part_info { 
	unsigned num_scales;

	const int *bw_table;

	unsigned num_bw;



	u8 int_reset_reg, int_reset_mask;

	u8 sleep_reg, sleep_mask;

	u8 bw_reg, bw_mask;

	u8 scale_reg, scale_mask;

	u8 power_reg, power_mask, lowpower_val;

	u8 int_enable_reg, int_enable_mask;

	u8 softreset_reg;



	int (*chip_config)(struct bma180_data *data);

	void (*chip_disable)(struct bma180_data *data);

};
@@ -77,13 +93,23 @@ struct bma180_part_info { 
#define BMA180_ID_REG_VAL	0x03



/* Chip power modes */

#define BMA180_LOW_NOISE	0x00

#define BMA180_LOW_POWER	0x03



/* Defaults values */

#define BMA180_DEF_PMODE	false

#define BMA180_DEF_BW		20

#define BMA180_DEF_SCALE	2452

#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_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 i2c_client *client;
@@ -107,6 +133,10 @@ enum bma180_chan { 
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 }; /* 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;
@@ -145,7 +175,8 @@ static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val) 


static int bma180_reset_intr(struct bma180_data *data)

{

	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1);

	int ret = bma180_set_bits(data, data->part_info->int_reset_reg,

		data->part_info->int_reset_mask, 1);



	if (ret)

		dev_err(&data->client->dev, "failed to reset interrupt\n");
@@ -155,10 +186,8 @@ static int bma180_reset_intr(struct bma180_data *data) 


static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state)

{

	u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;

	int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,

			reg_val);



	int ret = bma180_set_bits(data, data->part_info->int_enable_reg,

			data->part_info->int_enable_mask, state);

	if (ret)

		goto err;

	ret = bma180_reset_intr(data);
@@ -175,7 +204,8 @@ err: 


static int bma180_set_sleep_state(struct bma180_data *data, bool state)

{

	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state);

	int ret = bma180_set_bits(data, data->part_info->sleep_reg,

		data->part_info->sleep_mask, state);



	if (ret) {

		dev_err(&data->client->dev,
@@ -207,8 +237,8 @@ static int bma180_set_bw(struct bma180_data *data, int val) 


	for (i = 0; i < data->part_info->num_bw; ++i) {

		if (data->part_info->bw_table[i] == val) {

			ret = bma180_set_bits(data,

					BMA180_BW_TCS, BMA180_BW, i);

			ret = bma180_set_bits(data, data->part_info->bw_reg,

				data->part_info->bw_mask, i);

			if (ret) {

				dev_err(&data->client->dev,

					"failed to set bandwidth\n");
@@ -231,8 +261,8 @@ static int bma180_set_scale(struct bma180_data *data, int val) 


	for (i = 0; i < data->part_info->num_scales; ++i)

		if (data->part_info->scale_table[i] == val) {

			ret = bma180_set_bits(data,

					BMA180_OFFSET_LSB1, BMA180_RANGE, i);

			ret = bma180_set_bits(data, data->part_info->scale_reg,

				data->part_info->scale_mask, i);

			if (ret) {

				dev_err(&data->client->dev,

					"failed to set scale\n");
@@ -247,9 +277,9 @@ static int bma180_set_scale(struct bma180_data *data, int val) 


static int bma180_set_pmode(struct bma180_data *data, bool mode)

{

	u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;

	int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,

			reg_val);

	u8 reg_val = mode ? data->part_info->lowpower_val : 0;

	int ret = bma180_set_bits(data, data->part_info->power_reg,

		data->part_info->power_mask, reg_val);



	if (ret) {

		dev_err(&data->client->dev, "failed to set power mode\n");
@@ -263,7 +293,7 @@ static int bma180_set_pmode(struct bma180_data *data, bool mode) 
static int bma180_soft_reset(struct bma180_data *data)

{

	int ret = i2c_smbus_write_byte_data(data->client,

			BMA180_RESET, BMA180_RESET_VAL);

		data->part_info->softreset_reg, BMA180_RESET_VAL);



	if (ret)

		dev_err(&data->client->dev, "failed to reset the chip\n");
@@ -290,7 +320,11 @@ static int bma180_chip_init(struct bma180_data *data) 
	 */

	msleep(20);



	return 0;

	ret = bma180_set_new_data_intr_state(data, false);

	if (ret)

		return ret;



	return bma180_set_pmode(data, false);

}



static int bma180_chip_config(struct bma180_data *data)
@@ -305,19 +339,37 @@ static int bma180_chip_config(struct bma180_data *data) 
	ret = bma180_set_ee_writing_state(data, true);

	if (ret)

		goto err;

	ret = bma180_set_new_data_intr_state(data, false);

	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);

	if (ret)

		goto err;

	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);

	ret = bma180_set_bw(data, 20); /* 20 Hz */

	if (ret)

		goto err;

	ret = bma180_set_pmode(data, BMA180_DEF_PMODE);

	ret = bma180_set_scale(data, 2452); /* 2 G */

	if (ret)

		goto err;

	ret = bma180_set_bw(data, BMA180_DEF_BW);



	return 0;



err:

	dev_err(&data->client->dev, "failed to config the chip\n");

	return ret;

}



static int bma250_chip_config(struct bma180_data *data)

{

	int ret = bma180_chip_init(data);



	if (ret)

		goto err;

	ret = bma180_set_bw(data, 16); /* 16 Hz */

	if (ret)

		goto err;

	ret = bma180_set_scale(data, BMA180_DEF_SCALE);

	ret = bma180_set_scale(data, 38344); /* 2 G */

	if (ret)

		goto err;

	ret = bma180_set_bits(data, BMA250_INT_MAP_REG,

		BMA250_INT1_DATA_MASK, 1);

	if (ret)

		goto err;
@@ -343,6 +395,19 @@ err: 
	dev_err(&data->client->dev, "failed to disable the chip\n");

}



static void bma250_chip_disable(struct bma180_data *data)

{

	if (bma180_set_new_data_intr_state(data, false))

		goto err;

	if (bma180_set_sleep_state(data, true))

		goto err;



	return;



err:

	dev_err(&data->client->dev, "failed to disable the chip\n");

}



static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned n,

				 bool micros)

{
@@ -545,14 +610,43 @@ static const struct iio_chan_spec bma180_channels[] = { 
	IIO_CHAN_SOFT_TIMESTAMP(4),

};



static const struct iio_chan_spec bma250_channels[] = {

	BMA180_ACC_CHANNEL(X, 10),

	BMA180_ACC_CHANNEL(Y, 10),

	BMA180_ACC_CHANNEL(Z, 10),

	BMA180_TEMP_CHANNEL,

	IIO_CHAN_SOFT_TIMESTAMP(4),

};



static const struct bma180_part_info bma180_part_info[] = {

	[BMA180] = {

		bma180_channels, ARRAY_SIZE(bma180_channels),

		bma180_scale_table, ARRAY_SIZE(bma180_scale_table),

		bma180_bw_table, ARRAY_SIZE(bma180_bw_table),

		BMA180_CTRL_REG0, BMA180_RESET_INT,

		BMA180_CTRL_REG0, BMA180_SLEEP,

		BMA180_BW_TCS, BMA180_BW,

		BMA180_OFFSET_LSB1, BMA180_RANGE,

		BMA180_TCO_Z, BMA180_MODE_CONFIG, BMA180_LOW_POWER,

		BMA180_CTRL_REG3, BMA180_NEW_DATA_INT,

		BMA180_RESET,

		bma180_chip_config,

		bma180_chip_disable,

	},

	[BMA250] = {

		bma250_channels, ARRAY_SIZE(bma250_channels),

		bma250_scale_table, ARRAY_SIZE(bma250_scale_table),

		bma250_bw_table, ARRAY_SIZE(bma250_bw_table),

		BMA250_INT_RESET_REG, BMA250_INT_RESET_MASK,

		BMA250_POWER_REG, BMA250_SUSPEND_MASK,

		BMA250_BW_REG, BMA250_BW_MASK,

		BMA250_RANGE_REG, BMA250_RANGE_MASK,

		BMA250_POWER_REG, BMA250_LOWPOWER_MASK, 1,

		BMA250_INT_ENABLE_REG, BMA250_DATA_INTEN_MASK,

		BMA250_RESET_REG,

		bma250_chip_config,

		bma250_chip_disable,

	},

};



static irqreturn_t bma180_trigger_handler(int irq, void *p)
@@ -628,11 +722,10 @@ static int bma180_probe(struct i2c_client *client, 
		goto err_chip_disable;



	mutex_init(&data->mutex);



	indio_dev->dev.parent = &client->dev;

	indio_dev->channels = data->part_info->channels;

	indio_dev->num_channels = data->part_info->num_channels;

	indio_dev->name = BMA180_DRV_NAME;

	indio_dev->name = id->name;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->info = &bma180_info;
@@ -646,7 +739,7 @@ static int bma180_probe(struct i2c_client *client, 


		ret = devm_request_irq(&client->dev, client->irq,

			iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,

			BMA180_IRQ_NAME, data->trig);

			"bma180_event", data->trig);

		if (ret) {

			dev_err(&client->dev, "unable to request IRQ\n");

			goto err_trigger_free;
@@ -743,7 +836,8 @@ static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume); 
#endif



static struct i2c_device_id bma180_ids[] = {

	{ BMA180_DRV_NAME, BMA180 },

	{ "bma180", BMA180 },

	{ "bma250", BMA250 },

	{ }

};
@@ -751,7 +845,7 @@ MODULE_DEVICE_TABLE(i2c, bma180_ids); 


static struct i2c_driver bma180_driver = {

	.driver = {

		.name	= BMA180_DRV_NAME,

		.name	= "bma180",

		.owner	= THIS_MODULE,

		.pm	= BMA180_PM_OPS,

	},
@@ -764,5 +858,5 @@ module_i2c_driver(bma180_driver); 


MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");

MODULE_AUTHOR("Texas Instruments, Inc.");

MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");

MODULE_DESCRIPTION("Bosch BMA180/BMA250 triaxial acceleration sensor");

MODULE_LICENSE("GPL");

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