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@xxxxxxxxxx> Cc: Oleksandr Kravchenko <o.v.kravchenko@xxxxxxxxxxxxxxx> --- drivers/iio/accel/bma180.c | 161 +++++++++++++++++++++++++++++++++++---------- 1 file changed, 127 insertions(+), 34 deletions(-) diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c index 9fbc81f..c8e0a0a 100644 --- a/drivers/iio/accel/bma180.c +++ b/drivers/iio/accel/bma180.c @@ -3,9 +3,15 @@ * * Copyright 2013 Oleksandr Kravchenko <x0199363@xxxxxx> * + * Support for BMA250 (c) Peter Meerwald <pmeerw@xxxxxxxxxx> + * * 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> @@ -23,13 +29,13 @@ #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> -#define BMA180_DRV_NAME "bma180" -#define BMA180_IRQ_NAME "bma180_event" - enum { BMA180, + BMA250, }; +struct bma180_data; + struct bma180_part_info { const struct iio_chan_spec *channels; unsigned num_channels; @@ -37,6 +43,15 @@ 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); }; @@ -75,13 +90,23 @@ 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; @@ -105,6 +130,10 @@ 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; @@ -143,7 +172,8 @@ 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"); @@ -153,10 +183,8 @@ 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); @@ -173,7 +201,8 @@ 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, @@ -205,8 +234,8 @@ 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"); @@ -229,8 +258,8 @@ 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"); @@ -245,9 +274,9 @@ 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"); @@ -261,7 +290,7 @@ 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"); @@ -288,7 +317,11 @@ 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) @@ -303,19 +336,37 @@ 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, 38344); /* 2 G */ if (ret) goto err; - ret = bma180_set_scale(data, BMA180_DEF_SCALE); + ret = bma180_set_bits(data, BMA250_INT_MAP_REG, + BMA250_INT1_DATA_MASK, 1); if (ret) goto err; @@ -341,6 +392,19 @@ 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) { @@ -543,14 +607,43 @@ 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) @@ -626,11 +719,10 @@ 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; @@ -644,7 +736,7 @@ 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; @@ -741,7 +833,8 @@ 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 }, { } }; @@ -749,7 +842,7 @@ MODULE_DEVICE_TABLE(i2c, bma180_id); static struct i2c_driver bma180_driver = { .driver = { - .name = BMA180_DRV_NAME, + .name = "bma180", .owner = THIS_MODULE, .pm = BMA180_PM_OPS, }, @@ -762,5 +855,5 @@ module_i2c_driver(bma180_driver); MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@xxxxxx>"); MODULE_AUTHOR("Texas Instruments, Inc."); -MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor"); +MODULE_DESCRIPTION("Bosch BMA180/BMA250 triaxial acceleration sensor"); MODULE_LICENSE("GPL"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
