From: Oleksandr Kravchenko <o.v.kravchenko@xxxxxxxxxxxxxxx> This patch adds IIO driver for Bosch BMA180 triaxial acceleration sensor. http://omapworld.com/BMA180_111_1002839.pdf Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@xxxxxxxxxxxxxxx> --- .../devicetree/bindings/iio/accel/bma180.txt | 53 +++ drivers/iio/accel/Kconfig | 10 + drivers/iio/accel/Makefile | 2 + drivers/iio/accel/bma180.c | 462 ++++++++++++++++++++ 4 files changed, 527 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/accel/bma180.txt create mode 100644 drivers/iio/accel/bma180.c diff --git a/Documentation/devicetree/bindings/iio/accel/bma180.txt b/Documentation/devicetree/bindings/iio/accel/bma180.txt new file mode 100644 index 0000000..7c13c84 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/accel/bma180.txt @@ -0,0 +1,53 @@ +* Bosch BMA180 triaxial acceleration sensor + +http://omapworld.com/BMA180_111_1002839.pdf + +Required properties: + + - compatible : should be "bosch,bma180" + - reg : the I2C address of the sensor + +Optional properties: + + - interrupt-parent : should be the phandle for the interrupt controller + + - interrupts : interrupt mapping for GPIO IRQ, it shuld by configured with + flags IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING + + - range : select the full scale acceleration range + 0 : -1g..+1g + 1 : -1.5g..+1.5g + 2 : -2g..+2g + 3 : -3g..+3g + 4 : -4g..+4g + 5 : -8g..+8g + 6 : -16g..+16g + + - bw : select bandwidth bandwidth + 0 : 10Hz + 1 : 20Hz + 2 : 40Hz + 3 : 75Hz + 4 : 150Hz + 5 : 300Hz + Don't use bandwidth frequency more than 300Hz couse it + influences the frequency of generating new data interrupts + and i2c reading phase can be longer than pheriod of interrupt + generation. + + - mode_config : 0 - select low noise mode, 1 - select low power mode + + - fuzz : specifies fuzz value that is used to filter noise from the event stream + +Example: + +bma180@40 { + compatible = "bosch,bma180"; + reg = <0x40>; + interrupt-parent = <&gpio6>; + interrupts = <18 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>; + range = <2>; + bw = <0>; + mode_config = <1>; + fuzz = <555>; +}; diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 719d83f..61fd29f 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -3,6 +3,16 @@ # menu "Accelerometers" +config BMA180 + tristate "Bosch BMA180 3-Axis Accelerometer Driver" + depends on I2C + help + Say Y here if you want to build a driver for the Bosch BMA180 + triaxial acceleration sensor. + + To compile this driver as a module, choose M here: the + module will be called bma180. + config HID_SENSOR_ACCEL_3D depends on HID_SENSOR_HUB select IIO_BUFFER diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index 87d8fa2..31a36fa 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -12,3 +12,5 @@ obj-$(CONFIG_IIO_ST_ACCEL_I2C_3AXIS) += st_accel_i2c.o obj-$(CONFIG_IIO_ST_ACCEL_SPI_3AXIS) += st_accel_spi.o obj-$(CONFIG_KXSD9) += kxsd9.o + +obj-$(CONFIG_BMA180) += bma180.o diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c new file mode 100644 index 0000000..9f5341f --- /dev/null +++ b/drivers/iio/accel/bma180.c @@ -0,0 +1,462 @@ +/* + * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor + * + * Copyright 2013 Oleksandr Kravchenko <x0199363@xxxxxx> + * + * 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. + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/input.h> +#include <linux/of.h> +#include <linux/bitops.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> + +#define BMA180_DRV_NAME "bma180" +#define BMA180_IRQ_NAME "bma180_event" + +/* Register set */ +#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_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 + +/* Control bits */ +#define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */ +#define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */ +#define BMA180_EE_W BIT(4) /* Unlock writing to addr. from 0x20 */ +#define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */ +#define BMA180_SMP_SKIP BIT(0) /* Sample skipping mode */ + +/* Bit masks fo registerts bit fields */ +#define BMA180_RANGE 0x0e /* Range of accel measurment */ +#define BMA180_BW 0xf0 /* Accel measurmend bandwidth */ +#define BMA180_MODE_CONFIG 0x03 /* Config operation modes */ + +/* We have write this value in reset register to do soft reset */ +#define BMA180_RESET_VAL 0xb6 + +/* Chip operation modes */ +#define BMA180_LOW_NOISE 0x00 +#define BMA180_LOW_POWER 0x03 + +struct bma180_data { + struct i2c_client *client; + struct input_dev *input_dev; + struct mutex mutex; + int sleep_state; + int range; + int bw; + int mode; + int fuzz; + int acc_reg[3]; +}; + +enum bma180_axis { + AXIS_X, + AXIS_Y, + AXIS_Z, +}; + +struct bma180_range { + int g_range; + int ratio; +}; + +static struct bma180_range bma180_range_table[7] = { + { 1000, 130 }, + { 1500, 190 }, + { 2000, 250 }, + { 3000, 380 }, + { 4000, 500 }, + { 8000, 990 }, + { 16000, 1980 }, +}; + +static int bma180_get_acc_reg(struct bma180_data *data, enum bma180_axis axis) +{ + u8 reg = BMA180_ACC_X_LSB + axis * 2; + int ret; + + if (data->sleep_state) + return -EBUSY; + + ret = i2c_smbus_read_word_data(data->client, reg); + if (ret < 0) + dev_err(&data->client->dev, + "failed to read accel_%c registers\n", 'x' + axis); + + return ret; +} + +static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val) +{ + int ret = i2c_smbus_read_byte_data(data->client, reg); + u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1)); + + if (ret < 0) + return ret; + + return i2c_smbus_write_byte_data(data->client, reg, reg_val); +} + +static int bma180_set_new_data_intr_state(struct bma180_data *data, int state) +{ + u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00; + int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3, + reg_val); + + if (ret) + dev_err(&data->client->dev, + "failed to set new data interrupt state %d\n", state); + + return ret; +} + +static int bma180_set_sleep_state(struct bma180_data *data, int state) +{ + int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state); + + if (ret) { + dev_err(&data->client->dev, + "failed to set sleep state %d\n", state); + return ret; + } + data->sleep_state = state; + + return 0; +} + +static int bma180_set_ee_writing_state(struct bma180_data *data, int state) +{ + int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state); + + if (ret) + dev_err(&data->client->dev, + "failed to set ee writing state %d\n", state); + + return ret; +} + +static int bma180_soft_reset(struct bma180_data *data) +{ + int ret = i2c_smbus_write_byte_data(data->client, + BMA180_RESET, BMA180_RESET_VAL); + + if (ret) + dev_err(&data->client->dev, "failed to reset the chip\n"); + + return ret; +} + +static int bma180_chip_init(struct bma180_data *data) +{ + /* Try to read chip_id register. It must return 0x03. */ + int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID); + + if (ret < 0) + goto err; + if (ret != 0x03) { + ret = -ENODEV; + goto err; + } + + ret = bma180_soft_reset(data); + if (ret) + goto err; + /* + * No serial transaction should occur within minimum 10 μs + * after soft_reset command + */ + msleep(20); + + ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1); + if (ret) + goto err; + ret = bma180_set_ee_writing_state(data, 1); + if (ret) + goto err; + ret = bma180_set_new_data_intr_state(data, 0); + if (ret) + goto err; + ret = bma180_set_bits(data, BMA180_BW_TCS, BMA180_BW, data->bw); + if (ret) + goto err; + ret = bma180_set_bits(data, + BMA180_OFFSET_LSB1, BMA180_RANGE, data->range); + if (ret) + goto err; + ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG, + data->mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE); + if (ret) + goto err; + ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1); + if (ret) + goto err; + ret = bma180_set_new_data_intr_state(data, 1); + if (ret) + goto err; + ret = bma180_set_ee_writing_state(data, 0); + if (ret) + goto err; + + return 0; + +err: + dev_err(&data->client->dev, "failed to init the chip\n"); + return ret; +} + +static void bma180_chip_disable(struct bma180_data *data) +{ + if (bma180_set_ee_writing_state(data, 1)) + goto err; + if (bma180_set_new_data_intr_state(data, 0)) + goto err; + if (bma180_set_ee_writing_state(data, 0)) + goto err; + if (bma180_set_sleep_state(data, 1)) + goto err; + + return; + +err: + dev_err(&data->client->dev, "failed to disable the chip\n"); +} + +static int bma180_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask) +{ + struct bma180_data *data = iio_priv(indio_dev); + long tmp = ((s16)data->acc_reg[chan->channel] >> 2) + * bma180_range_table[data->range].ratio; + + if (data->acc_reg[chan->channel] < 0) + return data->acc_reg[chan->channel]; + + *val = tmp / 1000000; + *val2 = (tmp % 1000000); + + return IIO_VAL_INT_PLUS_MICRO; +} + +static const struct iio_info bma180_info = { + .driver_module = THIS_MODULE, + .read_raw = &bma180_read_raw, +}; + +static const struct iio_chan_spec bma180_channels[] = { + { + .type = IIO_ACCEL, + .channel = AXIS_X, + .channel2 = IIO_MOD_X, + .indexed = true, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + }, { + .type = IIO_ACCEL, + .channel = AXIS_Y, + .channel2 = IIO_MOD_Y, + .indexed = true, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + }, { + .type = IIO_ACCEL, + .channel = AXIS_Z, + .channel2 = IIO_MOD_Z, + .indexed = true, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + }, +}; + +static irqreturn_t bma180_interrupt_handler(int irq, void *private) +{ + struct iio_dev *dev_info = private; + struct bma180_data *data = iio_priv(dev_info); + int i; + + mutex_lock(&data->mutex); + for (i = AXIS_X; i <= AXIS_Z; ++i) + data->acc_reg[i] = bma180_get_acc_reg(data, i); + mutex_unlock(&data->mutex); + + input_report_abs(data->input_dev, ABS_X, data->acc_reg[AXIS_X]); + input_report_abs(data->input_dev, ABS_Y, data->acc_reg[AXIS_Y]); + input_report_abs(data->input_dev, ABS_Z, data->acc_reg[AXIS_Z]); + input_sync(data->input_dev); + + return IRQ_HANDLED; +} + +static int bma180_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct input_dev *input_dev; + struct bma180_data *data; + struct iio_dev *indio_dev; + struct device_node *np = client->dev.of_node; + int i, ret; + + if (!client->irq) { + dev_err(&client->dev, "this driver cann't work without IRQ\n"); + return -ENODEV; + } + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + input_dev = input_allocate_device(); + if (!input_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->client = client; + + of_property_read_u32(np, "bw", &data->bw); + of_property_read_u32(np, "range", &data->range); + of_property_read_u32(np, "mode", &data->mode); + of_property_read_u32(np, "fuzz", &data->fuzz); + + ret = bma180_chip_init(data); + if (ret < 0) + goto err_1; + + mutex_init(&data->mutex); + + indio_dev->dev.parent = &client->dev; + indio_dev->channels = bma180_channels; + indio_dev->num_channels = ARRAY_SIZE(bma180_channels); + indio_dev->name = BMA180_DRV_NAME; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &bma180_info; + + input_dev->name = BMA180_DRV_NAME; + input_dev->id.bustype = BUS_I2C; + __set_bit(EV_ABS, input_dev->evbit); + for (i = ABS_X; i <= ABS_Z; ++i) + input_set_abs_params(input_dev, i, + -bma180_range_table[data->range].g_range, + bma180_range_table[data->range].g_range, + data->fuzz, 0); + input_dev->dev.parent = &client->dev; + input_set_drvdata(input_dev, data); + + data->input_dev = input_dev; + + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, bma180_interrupt_handler, IRQF_ONESHOT, + BMA180_IRQ_NAME, indio_dev); + if (ret < 0) { + dev_err(&client->dev, "irq request error %d\n", -ret); + goto err_1; + } + + ret = input_register_device(input_dev); + if (ret) { + dev_err(&client->dev, "unable to register input device\n"); + goto err_1; + } + + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(&client->dev, "unable to register iio device\n"); + goto err_2; + } + + return 0; + +err_2: + input_unregister_device(input_dev); +err_1: + input_free_device(input_dev); + + bma180_chip_disable(data); + + return ret; +} + +static int bma180_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct bma180_data *data = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + input_unregister_device(data->input_dev); + + mutex_lock(&data->mutex); + bma180_chip_disable(data); + mutex_unlock(&data->mutex); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int bma180_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct bma180_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->mutex); + ret = bma180_set_sleep_state(data, 1); + mutex_unlock(&data->mutex); + + return ret; +} + +static int bma180_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct bma180_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->mutex); + ret = bma180_set_sleep_state(data, 0); + mutex_unlock(&data->mutex); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume); +#define BMA180_PM_OPS (&bma180_pm_ops) +#else +#define BMA180_PM_OPS NULL +#endif + +static struct i2c_device_id bma180_id[] = { + { BMA180_DRV_NAME, 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, bma180_id); + +static struct i2c_driver bma180_driver = { + .driver = { + .name = BMA180_DRV_NAME, + .owner = THIS_MODULE, + .pm = BMA180_PM_OPS, + }, + .probe = bma180_probe, + .remove = bma180_remove, + .id_table = bma180_id, +}; + +module_i2c_driver(bma180_driver); + +MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@xxxxxx>"); +MODULE_AUTHOR("Texas Instruments, Inc."); +MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor"); +MODULE_LICENSE("GPL"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
