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iio:bma180: Add BMA250 chip support

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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: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2014-08-19 23:43:00 +01:00 committed by Jonathan Cameron
parent 402a324e61
commit 2017cff24c
2 changed files with 129 additions and 35 deletions
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6
drivers/iio/accel/Kconfig
View File

@ -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.

158
drivers/iio/accel/bma180.c
View File

@ -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)
@ -303,21 +337,39 @@ static int bma180_chip_config(struct bma180_data *data)
if (ret)
goto err;
ret = bma180_set_ee_writing_state(data, true);
if (ret)
goto err;
ret = bma180_set_new_data_intr_state(data, false);
if (ret)
goto err;
ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
if (ret)
goto err;
ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
ret = bma180_set_bw(data, 20); /* 20 Hz */
if (ret)
goto err;
ret = bma180_set_bw(data, BMA180_DEF_BW);
ret = bma180_set_scale(data, 2452); /* 2 G */
if (ret)
goto err;
ret = bma180_set_scale(data, BMA180_DEF_SCALE);
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, 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");