On 08/10/16 13:34, Hans de Goede wrote: > Add an iio driver for the MiraMEMS DA280 3-axis 14-bit accelerometer, as > well as for the DA226 which is a fully compatible 2-axis version. > > Datasheets for the DA280 and DA226 can be found at the manufacturers site: > http://www.miramems.com/en/products.asp?list=1 > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> How many more of these devices do you have? :) You have another unwanted le16_to_cpu conversion of data coming off the back of an smbus word read. Otherwise, looks good to me. Jonathan > --- > .../devicetree/bindings/i2c/trivial-devices.txt | 2 + > drivers/iio/accel/Kconfig | 10 ++ > drivers/iio/accel/Makefile | 1 + > drivers/iio/accel/da280.c | 183 +++++++++++++++++++++ > 4 files changed, 196 insertions(+) > create mode 100644 drivers/iio/accel/da280.c > > diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt > index b23ded3..6e4ba81 100644 > --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt > +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt > @@ -124,6 +124,8 @@ microchip,mcp4662-502 Microchip 8-bit Dual I2C Digital Potentiometer with NV Mem > microchip,mcp4662-103 Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (10k) > microchip,mcp4662-503 Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (50k) > microchip,mcp4662-104 Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (100k) > +miramems,da226 MiraMEMS DA226 2-axis 14-bit digital accelerometer > +miramems,da280 MiraMEMS DA280 3-axis 14-bit digital accelerometer > miramems,da311 MiraMEMS DA311 3-axis 12-bit digital accelerometer > national,lm63 Temperature sensor with integrated fan control > national,lm75 I2C TEMP SENSOR > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig > index c94348f..c2ed6cf 100644 > --- a/drivers/iio/accel/Kconfig > +++ b/drivers/iio/accel/Kconfig > @@ -52,6 +52,16 @@ config BMC150_ACCEL_SPI > tristate > select REGMAP_SPI > > +config DA280 > + tristate "MiraMEMS DA280 3-axis 14-bit digital accelerometer driver" > + depends on I2C > + help > + Say yes here to build support for the MiraMEMS DA280 3-axis 14-bit > + digital accelerometer. > + > + To compile this driver as a module, choose M here: the > + module will be called da280. > + > config DA311 > tristate "MiraMEMS DA311 3-axis 12-bit digital accelerometer driver" > depends on I2C > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile > index 601ca59..b7a9ba7 100644 > --- a/drivers/iio/accel/Makefile > +++ b/drivers/iio/accel/Makefile > @@ -8,6 +8,7 @@ obj-$(CONFIG_BMA220) += bma220_spi.o > obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o > obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o > obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o > +obj-$(CONFIG_DA280) += da280.o > obj-$(CONFIG_DA311) += da311.o > obj-$(CONFIG_DMARD06) += dmard06.o > obj-$(CONFIG_DMARD09) += dmard09.o > diff --git a/drivers/iio/accel/da280.c b/drivers/iio/accel/da280.c > new file mode 100644 > index 0000000..7b1fe88 > --- /dev/null > +++ b/drivers/iio/accel/da280.c > @@ -0,0 +1,183 @@ > +/** > + * IIO driver for the MiraMEMS DA280 3-axis accelerometer and > + * IIO driver for the MiraMEMS DA226 2-axis accelerometer > + * > + * Copyright (c) 2016 Hans de Goede <hdegoede@xxxxxxxxxx> > + * > + * 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> > +#include <linux/iio/sysfs.h> > +#include <linux/byteorder/generic.h> > + > +#define DA280_REG_CHIP_ID 0x01 > +#define DA280_REG_ACC_X_LSB 0x02 > +#define DA280_REG_ACC_Y_LSB 0x04 > +#define DA280_REG_ACC_Z_LSB 0x06 > +#define DA280_REG_MODE_BW 0x11 > + > +#define DA280_CHIP_ID 0x13 > +#define DA280_MODE_ENABLE 0x1e > +#define DA280_MODE_DISABLE 0x9e > + > +enum { da226, da280 }; > + > +/* > + * a value of + or -4096 corresponds to + or - 1G > + * scale = 9.81 / 4096 = 0.002395019 > + */ > + > +static const int da280_nscale = 2395019; > + > +#define DA280_CHANNEL(reg, axis) { \ > + .type = IIO_ACCEL, \ > + .address = reg, \ > + .modified = 1, \ > + .channel2 = IIO_MOD_##axis, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ > +} > + > +static const struct iio_chan_spec da280_channels[] = { > + DA280_CHANNEL(DA280_REG_ACC_X_LSB, X), > + DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y), > + DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z), > +}; > + > +struct da280_data { > + struct i2c_client *client; > +}; > + > +static int da280_enable(struct i2c_client *client, bool enable) > +{ > + u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE; > + > + return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data); > +} > + > +static int da280_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct da280_data *data = iio_priv(indio_dev); > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + ret = i2c_smbus_read_word_data(data->client, chan->address); > + if (ret < 0) > + return ret; > + /* > + * Values are 14 bits, stored as 16 bits with the 2 > + * least significant bits always 0. > + */ > + *val = ((short)le16_to_cpu(ret)) >> 2; Same thing Lars picked up on before I think... It's already in cpu endian. > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SCALE: > + *val = 0; > + *val2 = da280_nscale; > + return IIO_VAL_INT_PLUS_NANO; > + default: > + return -EINVAL; > + } > +} > + > +static const struct iio_info da280_info = { > + .driver_module = THIS_MODULE, > + .read_raw = da280_read_raw, > +}; > + > +static int da280_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + int ret; > + struct iio_dev *indio_dev; > + struct da280_data *data; > + > + ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID); > + if (ret != DA280_CHIP_ID) > + return (ret < 0) ? ret : -ENODEV; > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > + if (!indio_dev) > + return -ENOMEM; > + > + data = iio_priv(indio_dev); > + data->client = client; > + i2c_set_clientdata(client, indio_dev); > + > + indio_dev->dev.parent = &client->dev; > + indio_dev->info = &da280_info; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->channels = da280_channels; > + if (id->driver_data == da226) { > + indio_dev->name = "da226"; > + indio_dev->num_channels = 2; > + } else { > + indio_dev->name = "da280"; > + indio_dev->num_channels = 3; > + } > + > + ret = da280_enable(client, true); > + if (ret < 0) > + return ret; > + > + ret = iio_device_register(indio_dev); > + if (ret < 0) { > + dev_err(&client->dev, "device_register failed\n"); > + da280_enable(client, false); > + } > + > + return ret; > +} > + > +static int da280_remove(struct i2c_client *client) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > + > + iio_device_unregister(indio_dev); > + > + return da280_enable(client, false); > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int da280_suspend(struct device *dev) > +{ > + return da280_enable(to_i2c_client(dev), false); > +} > + > +static int da280_resume(struct device *dev) > +{ > + return da280_enable(to_i2c_client(dev), true); > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume); > + > +static const struct i2c_device_id da280_i2c_id[] = { > + { "da226", da226 }, > + { "da280", da280 }, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, da280_i2c_id); > + > +static struct i2c_driver da280_driver = { > + .driver = { > + .name = "da280", > + .pm = &da280_pm_ops, > + }, > + .probe = da280_probe, > + .remove = da280_remove, > + .id_table = da280_i2c_id, > +}; > + > +module_i2c_driver(da280_driver); > + > +MODULE_AUTHOR("Hans de Goede <hdegoede@xxxxxxxxxx>"); > +MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver"); > +MODULE_LICENSE("GPL v2"); > -- 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
