On 08/10/16 19:02, Hans de Goede wrote: > Hi, > > On 08-10-16 19:17, Jonathan Cameron wrote: >> 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? :) > > I own 13 identical (on the outside) 7" android tablets with an > Allwinner A13/A23/A33 SoC, and I've access to 3 friends of mine own. > > And I'm trying to run Fedora with the mainline kernel on all 16 of them. > I'm actually working on hardware auto-detection for devicetree to deal > with the internal differences these "identical" tablets have, see: > > https://openiotelceurope2016.sched.org/event/7rqw/devicetree-hardware-autoconfiguration-hans-de-goede-red-hat?iframe=no&w=i:100;&sidebar=yes&bg=no > > I've the accelerometer working on all of them (now), so this should > be my last patch for a while. Although I do plan to add orientation > support to all the accel drivers used in those tablets, so I > guess that will be another round of patches. > >> You have another unwanted le16_to_cpu conversion of data coming off >> the back of an smbus word read. > > Ugh, I distinctly remember thinking that I needed to take that > out in this driver too, but clearly I did not. I'll post a fixed > v2 soon. Meh, happens to us all :) > >> Otherwise, looks good to me. > > Thank you for the quick response and review. I must say I find > the iio subsys a very welcoming subsys to contribute too. It is indeed a nice corner of the kernel to work in. If it wasn't I'd have burnt out long ago! Stuff like Daniel and co + now Alison mentoring outreachy certainly helps + a steady stream of other people just getting started keeps a level of enthusiasm going. Might help that generally the parts are cheap and getting something going as you've seen is simple + we are in the classic (advanced) maker territory. Anyhow, I thoroughly agree and would just like to add thanks to everyone who does review - I wouldn't keep up (anywhere near) without you all! Anyhow enough soppy stuff - back to reviewing ;) Jonathan > > Regards, > > Hans > > >> >> 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
