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: 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
Jonathan Cameron
parent
402a324e61
commit
2017cff24c
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@ -6,13 +6,13 @@
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menu "Accelerometers"
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config BMA180
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tristate "Bosch BMA180 3-Axis Accelerometer Driver"
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tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"
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depends on I2C
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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help
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Say Y here if you want to build a driver for the Bosch BMA180
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triaxial acceleration sensor.
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Say Y here if you want to build a driver for the Bosch BMA180 or
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BMA250 triaxial acceleration sensor.
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To compile this driver as a module, choose M here: the
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module will be called bma180.
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@ -3,9 +3,15 @@
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*
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* Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
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*
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* Support for BMA250 (c) Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* SPI is not supported by driver
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* BMA180: 7-bit I2C slave address 0x40 or 0x41
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* BMA250: 7-bit I2C slave address 0x18 or 0x19
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*/
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#include <linux/module.h>
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@ -28,6 +34,7 @@
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enum {
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BMA180,
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BMA250,
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};
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struct bma180_data;
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@ -39,6 +46,15 @@ struct bma180_part_info {
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unsigned num_scales;
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const int *bw_table;
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unsigned num_bw;
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u8 int_reset_reg, int_reset_mask;
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u8 sleep_reg, sleep_mask;
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u8 bw_reg, bw_mask;
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u8 scale_reg, scale_mask;
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u8 power_reg, power_mask, lowpower_val;
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u8 int_enable_reg, int_enable_mask;
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u8 softreset_reg;
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int (*chip_config)(struct bma180_data *data);
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void (*chip_disable)(struct bma180_data *data);
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};
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@ -77,13 +93,23 @@ struct bma180_part_info {
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#define BMA180_ID_REG_VAL 0x03
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/* Chip power modes */
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#define BMA180_LOW_NOISE 0x00
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#define BMA180_LOW_POWER 0x03
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/* Defaults values */
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#define BMA180_DEF_PMODE false
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#define BMA180_DEF_BW 20
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#define BMA180_DEF_SCALE 2452
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#define BMA250_RANGE_REG 0x0f
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#define BMA250_BW_REG 0x10
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#define BMA250_POWER_REG 0x11
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#define BMA250_RESET_REG 0x14
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#define BMA250_INT_ENABLE_REG 0x17
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#define BMA250_INT_MAP_REG 0x1a
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#define BMA250_INT_RESET_REG 0x21
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#define BMA250_RANGE_MASK GENMASK(3, 0) /* Range of accel values */
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#define BMA250_BW_MASK GENMASK(4, 0) /* Accel bandwidth */
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#define BMA250_SUSPEND_MASK BIT(7) /* chip will sleep */
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#define BMA250_LOWPOWER_MASK BIT(6)
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#define BMA250_DATA_INTEN_MASK BIT(4)
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#define BMA250_INT1_DATA_MASK BIT(0)
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#define BMA250_INT_RESET_MASK BIT(7) /* Reset pending interrupts */
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struct bma180_data {
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struct i2c_client *client;
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@ -107,6 +133,10 @@ enum bma180_chan {
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static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
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static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
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static int bma250_bw_table[] = { 8, 16, 31, 63, 125, 250 }; /* Hz */
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static int bma250_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
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0, 0, 306458 };
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static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan)
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{
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int ret;
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@ -145,7 +175,8 @@ static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
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static int bma180_reset_intr(struct bma180_data *data)
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{
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int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1);
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int ret = bma180_set_bits(data, data->part_info->int_reset_reg,
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data->part_info->int_reset_mask, 1);
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if (ret)
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dev_err(&data->client->dev, "failed to reset interrupt\n");
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@ -155,10 +186,8 @@ static int bma180_reset_intr(struct bma180_data *data)
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static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state)
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{
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u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;
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int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,
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reg_val);
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int ret = bma180_set_bits(data, data->part_info->int_enable_reg,
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data->part_info->int_enable_mask, state);
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if (ret)
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goto err;
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ret = bma180_reset_intr(data);
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@ -175,7 +204,8 @@ err:
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static int bma180_set_sleep_state(struct bma180_data *data, bool state)
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{
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int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state);
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int ret = bma180_set_bits(data, data->part_info->sleep_reg,
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data->part_info->sleep_mask, state);
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if (ret) {
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dev_err(&data->client->dev,
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@ -207,8 +237,8 @@ static int bma180_set_bw(struct bma180_data *data, int val)
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for (i = 0; i < data->part_info->num_bw; ++i) {
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if (data->part_info->bw_table[i] == val) {
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ret = bma180_set_bits(data,
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BMA180_BW_TCS, BMA180_BW, i);
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ret = bma180_set_bits(data, data->part_info->bw_reg,
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data->part_info->bw_mask, i);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set bandwidth\n");
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@ -231,8 +261,8 @@ static int bma180_set_scale(struct bma180_data *data, int val)
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for (i = 0; i < data->part_info->num_scales; ++i)
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if (data->part_info->scale_table[i] == val) {
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ret = bma180_set_bits(data,
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BMA180_OFFSET_LSB1, BMA180_RANGE, i);
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ret = bma180_set_bits(data, data->part_info->scale_reg,
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data->part_info->scale_mask, i);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set scale\n");
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@ -247,9 +277,9 @@ static int bma180_set_scale(struct bma180_data *data, int val)
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static int bma180_set_pmode(struct bma180_data *data, bool mode)
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{
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u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;
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int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
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reg_val);
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u8 reg_val = mode ? data->part_info->lowpower_val : 0;
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int ret = bma180_set_bits(data, data->part_info->power_reg,
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data->part_info->power_mask, reg_val);
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if (ret) {
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dev_err(&data->client->dev, "failed to set power mode\n");
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@ -263,7 +293,7 @@ static int bma180_set_pmode(struct bma180_data *data, bool mode)
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static int bma180_soft_reset(struct bma180_data *data)
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{
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int ret = i2c_smbus_write_byte_data(data->client,
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BMA180_RESET, BMA180_RESET_VAL);
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data->part_info->softreset_reg, BMA180_RESET_VAL);
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if (ret)
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dev_err(&data->client->dev, "failed to reset the chip\n");
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@ -290,7 +320,11 @@ static int bma180_chip_init(struct bma180_data *data)
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*/
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msleep(20);
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return 0;
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ret = bma180_set_new_data_intr_state(data, false);
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if (ret)
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return ret;
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return bma180_set_pmode(data, false);
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}
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static int bma180_chip_config(struct bma180_data *data)
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@ -303,21 +337,39 @@ static int bma180_chip_config(struct bma180_data *data)
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if (ret)
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goto err;
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ret = bma180_set_ee_writing_state(data, true);
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if (ret)
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goto err;
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ret = bma180_set_new_data_intr_state(data, false);
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if (ret)
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goto err;
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ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
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if (ret)
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goto err;
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ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
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ret = bma180_set_bw(data, 20); /* 20 Hz */
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if (ret)
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goto err;
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ret = bma180_set_bw(data, BMA180_DEF_BW);
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ret = bma180_set_scale(data, 2452); /* 2 G */
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if (ret)
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goto err;
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ret = bma180_set_scale(data, BMA180_DEF_SCALE);
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return 0;
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err:
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dev_err(&data->client->dev, "failed to config the chip\n");
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return ret;
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}
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static int bma250_chip_config(struct bma180_data *data)
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{
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int ret = bma180_chip_init(data);
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if (ret)
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goto err;
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ret = bma180_set_bw(data, 16); /* 16 Hz */
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if (ret)
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goto err;
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ret = bma180_set_scale(data, 38344); /* 2 G */
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if (ret)
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goto err;
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ret = bma180_set_bits(data, BMA250_INT_MAP_REG,
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BMA250_INT1_DATA_MASK, 1);
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if (ret)
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goto err;
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@ -343,6 +395,19 @@ err:
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dev_err(&data->client->dev, "failed to disable the chip\n");
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}
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static void bma250_chip_disable(struct bma180_data *data)
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{
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if (bma180_set_new_data_intr_state(data, false))
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goto err;
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if (bma180_set_sleep_state(data, true))
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goto err;
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return;
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err:
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dev_err(&data->client->dev, "failed to disable the chip\n");
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}
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static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned n,
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bool micros)
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{
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@ -545,14 +610,43 @@ static const struct iio_chan_spec bma180_channels[] = {
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static const struct iio_chan_spec bma250_channels[] = {
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BMA180_ACC_CHANNEL(X, 10),
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BMA180_ACC_CHANNEL(Y, 10),
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BMA180_ACC_CHANNEL(Z, 10),
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BMA180_TEMP_CHANNEL,
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static const struct bma180_part_info bma180_part_info[] = {
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[BMA180] = {
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bma180_channels, ARRAY_SIZE(bma180_channels),
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bma180_scale_table, ARRAY_SIZE(bma180_scale_table),
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bma180_bw_table, ARRAY_SIZE(bma180_bw_table),
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BMA180_CTRL_REG0, BMA180_RESET_INT,
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BMA180_CTRL_REG0, BMA180_SLEEP,
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BMA180_BW_TCS, BMA180_BW,
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BMA180_OFFSET_LSB1, BMA180_RANGE,
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BMA180_TCO_Z, BMA180_MODE_CONFIG, BMA180_LOW_POWER,
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BMA180_CTRL_REG3, BMA180_NEW_DATA_INT,
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BMA180_RESET,
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bma180_chip_config,
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bma180_chip_disable,
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},
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[BMA250] = {
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bma250_channels, ARRAY_SIZE(bma250_channels),
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bma250_scale_table, ARRAY_SIZE(bma250_scale_table),
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bma250_bw_table, ARRAY_SIZE(bma250_bw_table),
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BMA250_INT_RESET_REG, BMA250_INT_RESET_MASK,
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BMA250_POWER_REG, BMA250_SUSPEND_MASK,
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BMA250_BW_REG, BMA250_BW_MASK,
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BMA250_RANGE_REG, BMA250_RANGE_MASK,
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BMA250_POWER_REG, BMA250_LOWPOWER_MASK, 1,
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BMA250_INT_ENABLE_REG, BMA250_DATA_INTEN_MASK,
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BMA250_RESET_REG,
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bma250_chip_config,
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bma250_chip_disable,
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},
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};
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static irqreturn_t bma180_trigger_handler(int irq, void *p)
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@ -628,11 +722,10 @@ static int bma180_probe(struct i2c_client *client,
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goto err_chip_disable;
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mutex_init(&data->mutex);
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indio_dev->dev.parent = &client->dev;
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indio_dev->channels = data->part_info->channels;
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indio_dev->num_channels = data->part_info->num_channels;
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indio_dev->name = BMA180_DRV_NAME;
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indio_dev->name = id->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &bma180_info;
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@ -646,7 +739,7 @@ static int bma180_probe(struct i2c_client *client,
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ret = devm_request_irq(&client->dev, client->irq,
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iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,
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BMA180_IRQ_NAME, data->trig);
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"bma180_event", data->trig);
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if (ret) {
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dev_err(&client->dev, "unable to request IRQ\n");
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goto err_trigger_free;
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@ -743,7 +836,8 @@ static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
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#endif
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static struct i2c_device_id bma180_ids[] = {
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{ BMA180_DRV_NAME, BMA180 },
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{ "bma180", BMA180 },
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{ "bma250", BMA250 },
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{ }
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};
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@ -751,7 +845,7 @@ MODULE_DEVICE_TABLE(i2c, bma180_ids);
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static struct i2c_driver bma180_driver = {
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.driver = {
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.name = BMA180_DRV_NAME,
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.name = "bma180",
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.owner = THIS_MODULE,
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.pm = BMA180_PM_OPS,
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},
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@ -764,5 +858,5 @@ module_i2c_driver(bma180_driver);
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MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
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MODULE_AUTHOR("Texas Instruments, Inc.");
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MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
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MODULE_DESCRIPTION("Bosch BMA180/BMA250 triaxial acceleration sensor");
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MODULE_LICENSE("GPL");
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