diff options
Diffstat (limited to 'drivers/iio/accel/dmard06.c')
| -rw-r--r-- | drivers/iio/accel/dmard06.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/iio/accel/dmard06.c b/drivers/iio/accel/dmard06.c new file mode 100644 index 0000000..656ca8e --- /dev/null +++ b/drivers/iio/accel/dmard06.c @@ -0,0 +1,241 @@ +/* + * IIO driver for Domintech DMARD06 accelerometer + * + * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/iio/iio.h> + +#define DMARD06_DRV_NAME "dmard06" + +/* Device data registers */ +#define DMARD06_CHIP_ID_REG 0x0f +#define DMARD06_TOUT_REG 0x40 +#define DMARD06_XOUT_REG 0x41 +#define DMARD06_YOUT_REG 0x42 +#define DMARD06_ZOUT_REG 0x43 +#define DMARD06_CTRL1_REG 0x44 + +/* Device ID value */ +#define DMARD05_CHIP_ID 0x05 +#define DMARD06_CHIP_ID 0x06 +#define DMARD07_CHIP_ID 0x07 + +/* Device values */ +#define DMARD05_AXIS_SCALE_VAL 15625 +#define DMARD06_AXIS_SCALE_VAL 31250 +#define DMARD06_TEMP_CENTER_VAL 25 +#define DMARD06_SIGN_BIT 7 + +/* Device power modes */ +#define DMARD06_MODE_NORMAL 0x27 +#define DMARD06_MODE_POWERDOWN 0x00 + +/* Device channels */ +#define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \ + .type = IIO_ACCEL, \ + .address = _reg, \ + .channel2 = IIO_MOD_##_axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .modified = 1, \ +} + +#define DMARD06_TEMP_CHANNEL(_reg) { \ + .type = IIO_TEMP, \ + .address = _reg, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_OFFSET), \ +} + +struct dmard06_data { + struct i2c_client *client; + u8 chip_id; +}; + +static const struct iio_chan_spec dmard06_channels[] = { + DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG), + DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG), + DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG), + DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG), +}; + +static int dmard06_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct dmard06_data *dmard06 = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = i2c_smbus_read_byte_data(dmard06->client, + chan->address); + if (ret < 0) { + dev_err(&dmard06->client->dev, + "Error reading data: %d\n", ret); + return ret; + } + + *val = sign_extend32(ret, DMARD06_SIGN_BIT); + + if (dmard06->chip_id == DMARD06_CHIP_ID) + *val = *val >> 1; + + switch (chan->type) { + case IIO_ACCEL: + return IIO_VAL_INT; + case IIO_TEMP: + if (dmard06->chip_id != DMARD06_CHIP_ID) + *val = *val / 2; + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_OFFSET: + switch (chan->type) { + case IIO_TEMP: + *val = DMARD06_TEMP_CENTER_VAL; + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_ACCEL: + *val = 0; + if (dmard06->chip_id == DMARD06_CHIP_ID) + *val2 = DMARD06_AXIS_SCALE_VAL; + else + *val2 = DMARD05_AXIS_SCALE_VAL; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static const struct iio_info dmard06_info = { + .driver_module = THIS_MODULE, + .read_raw = dmard06_read_raw, +}; + +static int dmard06_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct iio_dev *indio_dev; + struct dmard06_data *dmard06; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "I2C check functionality failed\n"); + return -ENXIO; + } + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06)); + if (!indio_dev) { + dev_err(&client->dev, "Failed to allocate iio device\n"); + return -ENOMEM; + } + + dmard06 = iio_priv(indio_dev); + dmard06->client = client; + + ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG); + if (ret < 0) { + dev_err(&client->dev, "Error reading chip id: %d\n", ret); + return ret; + } + + if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID && + ret != DMARD07_CHIP_ID) { + dev_err(&client->dev, "Invalid chip id: %02d\n", ret); + return -ENODEV; + } + + dmard06->chip_id = ret; + + i2c_set_clientdata(client, indio_dev); + indio_dev->dev.parent = &client->dev; + indio_dev->name = DMARD06_DRV_NAME; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = dmard06_channels; + indio_dev->num_channels = ARRAY_SIZE(dmard06_channels); + indio_dev->info = &dmard06_info; + + return devm_iio_device_register(&client->dev, indio_dev); +} + +#ifdef CONFIG_PM_SLEEP +static int dmard06_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct dmard06_data *dmard06 = iio_priv(indio_dev); + int ret; + + ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG, + DMARD06_MODE_POWERDOWN); + if (ret < 0) + return ret; + + return 0; +} + +static int dmard06_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct dmard06_data *dmard06 = iio_priv(indio_dev); + int ret; + + ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG, + DMARD06_MODE_NORMAL); + if (ret < 0) + return ret; + + return 0; +} + +static SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, dmard06_resume); +#define DMARD06_PM_OPS (&dmard06_pm_ops) +#else +#define DMARD06_PM_OPS NULL +#endif + +static const struct i2c_device_id dmard06_id[] = { + { "dmard05", 0 }, + { "dmard06", 0 }, + { "dmard07", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, dmard06_id); + +static const struct of_device_id dmard06_of_match[] = { + { .compatible = "domintech,dmard05" }, + { .compatible = "domintech,dmard06" }, + { .compatible = "domintech,dmard07" }, + { } +}; +MODULE_DEVICE_TABLE(of, dmard06_of_match); + +static struct i2c_driver dmard06_driver = { + .probe = dmard06_probe, + .id_table = dmard06_id, + .driver = { + .name = DMARD06_DRV_NAME, + .of_match_table = of_match_ptr(dmard06_of_match), + .pm = DMARD06_PM_OPS, + }, +}; +module_i2c_driver(dmard06_driver); + +MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>"); +MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver"); +MODULE_LICENSE("GPL v2"); |