> This driver is based on the DA311 Android driver which can be found here: > https://git.matricom.net/Firmware/kernel_amlogic_meson-common/tree/1e70113a5befd07debb68f537156def84c5be57a/drivers/amlogic/input/sensor > the mir3da_* files are the DA311 driver. looks good to me, minor comment below > Unfortunately there is no datasheet. > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> > --- > .../devicetree/bindings/i2c/trivial-devices.txt | 1 + > drivers/iio/accel/Kconfig | 10 + > drivers/iio/accel/Makefile | 1 + > drivers/iio/accel/da311.c | 312 +++++++++++++++++++++ > 4 files changed, 324 insertions(+) > create mode 100644 drivers/iio/accel/da311.c > > diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt > index 21ca02e..8ad9064 100644 > --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt > +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt > @@ -122,6 +122,7 @@ 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,da311 MiraMEMS DA311 3-axis 12-bit digital accelerometer > national,lm63 Temperature sensor with integrated fan control > national,lm75 I2C TEMP SENSOR > national,lm80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig > index 6236fd5..c94348f 100644 > --- a/drivers/iio/accel/Kconfig > +++ b/drivers/iio/accel/Kconfig > @@ -52,6 +52,16 @@ config BMC150_ACCEL_SPI > tristate > select REGMAP_SPI > > +config DA311 > + tristate "MiraMEMS DA311 3-axis 12-bit digital accelerometer driver" > + depends on I2C > + help > + Say yes here to build support for the MiraMEMS DA311 3-axis 12-bit > + digital accelerometer. > + > + To compile this driver as a module, choose M here: the > + module will be called da311. > + > config DMARD06 > tristate "Domintech DMARD06 Digital Accelerometer Driver" > depends on OF || COMPILE_TEST > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile > index 9f51559..601ca59 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-$(CONFIG_DA311) += da311.o > obj-$(CONFIG_DMARD06) += dmard06.o > obj-$(CONFIG_DMARD09) += dmard09.o > obj-$(CONFIG_DMARD10) += dmard10.o > diff --git a/drivers/iio/accel/da311.c b/drivers/iio/accel/da311.c > new file mode 100644 > index 0000000..93d027c > --- /dev/null > +++ b/drivers/iio/accel/da311.c > @@ -0,0 +1,312 @@ > +/** > + * IIO driver for the MiraMEMS DA311 3-axis accelerometer > + * > + * Copyright (c) 2016 Hans de Goede <hdegoede@xxxxxxxxxx> > + * Copyright (c) 2011-2013 MiraMEMS Sensing Technology Co., Ltd. > + * > + * 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 DA311_CHIP_ID 0x13 > + > +/* > + * Note register addressed go from 0 - 0x3f and then wrap. > + * For some reason there are 2 banks with 0 - 0x3f addresses, > + * rather then a single 0-0x7f bank. > + */ > + > +/* Bank 0 regs */ > +#define DA311_REG_BANK 0x0000 > +#define DA311_REG_LDO_REG 0x0006 > +#define DA311_REG_CHIP_ID 0x000f > +#define DA311_REG_TEMP_CFG_REG 0x001f > +#define DA311_REG_CTRL_REG1 0x0020 > +#define DA311_REG_CTRL_REG3 0x0022 > +#define DA311_REG_CTRL_REG4 0x0023 > +#define DA311_REG_CTRL_REG5 0x0024 > +#define DA311_REG_CTRL_REG6 0x0025 > +#define DA311_REG_STATUS_REG 0x0027 > +#define DA311_REG_OUT_X_L 0x0028 > +#define DA311_REG_OUT_X_H 0x0029 > +#define DA311_REG_OUT_Y_L 0x002a > +#define DA311_REG_OUT_Y_H 0x002b > +#define DA311_REG_OUT_Z_L 0x002c > +#define DA311_REG_OUT_Z_H 0x002d > +#define DA311_REG_INT1_CFG 0x0030 > +#define DA311_REG_INT1_SRC 0x0031 > +#define DA311_REG_INT1_THS 0x0032 > +#define DA311_REG_INT1_DURATION 0x0033 > +#define DA311_REG_INT2_CFG 0x0034 > +#define DA311_REG_INT2_SRC 0x0035 > +#define DA311_REG_INT2_THS 0x0036 > +#define DA311_REG_INT2_DURATION 0x0037 > +#define DA311_REG_CLICK_CFG 0x0038 > +#define DA311_REG_CLICK_SRC 0x0039 > +#define DA311_REG_CLICK_THS 0x003a > +#define DA311_REG_TIME_LIMIT 0x003b > +#define DA311_REG_TIME_LATENCY 0x003c > +#define DA311_REG_TIME_WINDOW 0x003d > + > +/* Bank 1 regs */ > +#define DA311_REG_SOFT_RESET 0x0105 > +#define DA311_REG_OTP_XOFF_L 0x0110 > +#define DA311_REG_OTP_XOFF_H 0x0111 > +#define DA311_REG_OTP_YOFF_L 0x0112 > +#define DA311_REG_OTP_YOFF_H 0x0113 > +#define DA311_REG_OTP_ZOFF_L 0x0114 > +#define DA311_REG_OTP_ZOFF_H 0x0115 > +#define DA311_REG_OTP_XSO 0x0116 > +#define DA311_REG_OTP_YSO 0x0117 > +#define DA311_REG_OTP_ZSO 0x0118 > +#define DA311_REG_OTP_TRIM_OSC 0x011b > +#define DA311_REG_LPF_ABSOLUTE 0x011c > +#define DA311_REG_TEMP_OFF1 0x0127 > +#define DA311_REG_TEMP_OFF2 0x0128 > +#define DA311_REG_TEMP_OFF3 0x0129 > +#define DA311_REG_OTP_TRIM_THERM_H 0x011a > + > +/* > + * a value of + or -1024 corresponds to + or - 1G > + * scale = 1 / 1024 = 0.000976562 > + */ > + > +static const int da311_nscale = 976562; > + > +#define DA311_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 da311_channels[] = { > + /* | 0x80 comes from the android driver */ > + DA311_CHANNEL(DA311_REG_OUT_X_L | 0x80, X), > + DA311_CHANNEL(DA311_REG_OUT_Y_L | 0x80, Y), > + DA311_CHANNEL(DA311_REG_OUT_Z_L | 0x80, Z), > +}; > + > +struct da311_data { > + struct i2c_client *client; > +}; > + > +static int da311_register_mask_write(struct i2c_client *client, u16 addr, > + u8 mask, u8 data) > +{ > + int ret; > + u8 tmp_data = 0; > + > + if (addr & 0xff00) { > + /* Select bank 1 */ > + ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x01); > + if (ret < 0) > + return ret; > + } > + > + if (mask != 0xff) { > + ret = i2c_smbus_read_byte_data(client, addr); > + if (ret < 0) > + return ret; > + tmp_data = ret; > + } > + > + tmp_data &= ~mask; > + tmp_data |= data & mask; > + ret = i2c_smbus_write_byte_data(client, addr & 0xff, tmp_data); > + if (ret < 0) > + return ret; > + > + if (addr & 0xff00) { > + /* Back to bank 0 */ > + ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x00); > + if (ret < 0) > + return ret; > + } > + > + return 0; > +} > + > +/* Init sequence taken from the android driver */ > +static int da311_reset(struct i2c_client *client) > +{ > + const struct { > + u16 addr; > + u8 mask; > + u8 data; > + } init_data[] = { > + { DA311_REG_TEMP_CFG_REG, 0xff, 0x08 }, > + { DA311_REG_CTRL_REG5, 0xff, 0x80 }, > + { DA311_REG_CTRL_REG4, 0x30, 0x00 }, > + { DA311_REG_CTRL_REG1, 0xff, 0x6f }, > + { DA311_REG_TEMP_CFG_REG, 0xff, 0x88 }, > + { DA311_REG_LDO_REG, 0xff, 0x02 }, > + { DA311_REG_OTP_TRIM_OSC, 0xff, 0x27 }, > + { DA311_REG_LPF_ABSOLUTE, 0xff, 0x30 }, > + { DA311_REG_TEMP_OFF1, 0xff, 0x3f }, > + { DA311_REG_TEMP_OFF2, 0xff, 0xff }, > + { DA311_REG_TEMP_OFF3, 0xff, 0x0f }, > + }; > + int i, ret; > + > + /* Reset */ > + ret = da311_register_mask_write(client, DA311_REG_SOFT_RESET, > + 0xff, 0xaa); > + if (ret < 0) > + return ret; > + > + for (i = 0; i < ARRAY_SIZE(init_data); i++) { > + ret = da311_register_mask_write(client, > + init_data[i].addr, > + init_data[i].mask, > + init_data[i].data); > + if (ret < 0) > + return ret; > + } > + > + return 0; > +} > + > +static int da311_enable(struct i2c_client *client, bool enable) > +{ > + u8 data = enable ? 0x00 : 0x20; > + > + return da311_register_mask_write(client, DA311_REG_TEMP_CFG_REG, > + 0x20, data); > +} > + > +static int da311_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct da311_data *data = iio_priv(indio_dev); > + __le16 buf; > + short tmp_val; > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: can't i2c_smbus_read_word_data() be used? and then sign_extend32() > + ret = i2c_smbus_read_i2c_block_data(data->client, > + chan->address, > + sizeof(buf), (u8 *)&buf); > + if (ret < 0) > + return ret; > + tmp_val = le16_to_cpu(buf); > + /* > + * Values are 12 bits, stored as 16 bits with the 4 > + * least significant bits always 0. > + */ > + *val = tmp_val >> 4; > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SCALE: > + *val = 0; > + *val2 = da311_nscale; > + return IIO_VAL_INT_PLUS_NANO; > + default: > + return -EINVAL; > + } > +} > + > +static const struct iio_info da311_info = { > + .driver_module = THIS_MODULE, > + .read_raw = da311_read_raw, > +}; > + > +static int da311_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + int ret; > + struct iio_dev *indio_dev; > + struct da311_data *data; > + > + ret = i2c_smbus_read_byte_data(client, DA311_REG_CHIP_ID); > + if (ret != DA311_CHIP_ID) > + return (ret < 0) ? ret : -ENODEV; > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > + if (!indio_dev) { > + dev_err(&client->dev, "iio allocation failed!\n"); > + 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 = &da311_info; > + indio_dev->name = "da311"; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->channels = da311_channels; > + indio_dev->num_channels = ARRAY_SIZE(da311_channels); > + > + ret = da311_reset(client); > + if (ret < 0) > + return ret; > + > + ret = da311_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"); > + da311_enable(client, false); > + } > + > + return ret; > +} > + > +static int da311_remove(struct i2c_client *client) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > + > + iio_device_unregister(indio_dev); > + > + return da311_enable(client, false); > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int da311_suspend(struct device *dev) > +{ > + return da311_enable(to_i2c_client(dev), false); > +} > + > +static int da311_resume(struct device *dev) > +{ > + return da311_enable(to_i2c_client(dev), true); > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(da311_pm_ops, da311_suspend, da311_resume); > + > +static const struct i2c_device_id da311_i2c_id[] = { > + {"da311", 0}, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, da311_i2c_id); > + > +static struct i2c_driver da311_driver = { > + .driver = { > + .name = "da311", > + .pm = &da311_pm_ops, > + }, > + .probe = da311_probe, > + .remove = da311_remove, > + .id_table = da311_i2c_id, > +}; > + > +module_i2c_driver(da311_driver); > + > +MODULE_AUTHOR("Hans de Goede <hdegoede@xxxxxxxxxx>"); > +MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver"); > +MODULE_LICENSE("GPL v2"); > -- Peter Meerwald-Stadler +43-664-2444418 (mobile) -- 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
