290 lines
7.1 KiB
C
290 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IIO driver for the MiraMEMS DA311 3-axis accelerometer
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*
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* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
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* Copyright (c) 2011-2013 MiraMEMS Sensing Technology Co., Ltd.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/byteorder/generic.h>
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#define DA311_CHIP_ID 0x13
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/*
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* Note register addressed go from 0 - 0x3f and then wrap.
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* For some reason there are 2 banks with 0 - 0x3f addresses,
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* rather then a single 0-0x7f bank.
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*/
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/* Bank 0 regs */
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#define DA311_REG_BANK 0x0000
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#define DA311_REG_LDO_REG 0x0006
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#define DA311_REG_CHIP_ID 0x000f
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#define DA311_REG_TEMP_CFG_REG 0x001f
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#define DA311_REG_CTRL_REG1 0x0020
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#define DA311_REG_CTRL_REG3 0x0022
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#define DA311_REG_CTRL_REG4 0x0023
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#define DA311_REG_CTRL_REG5 0x0024
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#define DA311_REG_CTRL_REG6 0x0025
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#define DA311_REG_STATUS_REG 0x0027
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#define DA311_REG_OUT_X_L 0x0028
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#define DA311_REG_OUT_X_H 0x0029
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#define DA311_REG_OUT_Y_L 0x002a
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#define DA311_REG_OUT_Y_H 0x002b
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#define DA311_REG_OUT_Z_L 0x002c
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#define DA311_REG_OUT_Z_H 0x002d
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#define DA311_REG_INT1_CFG 0x0030
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#define DA311_REG_INT1_SRC 0x0031
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#define DA311_REG_INT1_THS 0x0032
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#define DA311_REG_INT1_DURATION 0x0033
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#define DA311_REG_INT2_CFG 0x0034
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#define DA311_REG_INT2_SRC 0x0035
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#define DA311_REG_INT2_THS 0x0036
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#define DA311_REG_INT2_DURATION 0x0037
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#define DA311_REG_CLICK_CFG 0x0038
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#define DA311_REG_CLICK_SRC 0x0039
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#define DA311_REG_CLICK_THS 0x003a
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#define DA311_REG_TIME_LIMIT 0x003b
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#define DA311_REG_TIME_LATENCY 0x003c
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#define DA311_REG_TIME_WINDOW 0x003d
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/* Bank 1 regs */
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#define DA311_REG_SOFT_RESET 0x0105
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#define DA311_REG_OTP_XOFF_L 0x0110
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#define DA311_REG_OTP_XOFF_H 0x0111
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#define DA311_REG_OTP_YOFF_L 0x0112
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#define DA311_REG_OTP_YOFF_H 0x0113
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#define DA311_REG_OTP_ZOFF_L 0x0114
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#define DA311_REG_OTP_ZOFF_H 0x0115
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#define DA311_REG_OTP_XSO 0x0116
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#define DA311_REG_OTP_YSO 0x0117
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#define DA311_REG_OTP_ZSO 0x0118
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#define DA311_REG_OTP_TRIM_OSC 0x011b
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#define DA311_REG_LPF_ABSOLUTE 0x011c
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#define DA311_REG_TEMP_OFF1 0x0127
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#define DA311_REG_TEMP_OFF2 0x0128
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#define DA311_REG_TEMP_OFF3 0x0129
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#define DA311_REG_OTP_TRIM_THERM_H 0x011a
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/*
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* a value of + or -1024 corresponds to + or - 1G
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* scale = 9.81 / 1024 = 0.009580078
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*/
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static const int da311_nscale = 9580078;
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#define DA311_CHANNEL(reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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}
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static const struct iio_chan_spec da311_channels[] = {
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/* | 0x80 comes from the android driver */
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DA311_CHANNEL(DA311_REG_OUT_X_L | 0x80, X),
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DA311_CHANNEL(DA311_REG_OUT_Y_L | 0x80, Y),
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DA311_CHANNEL(DA311_REG_OUT_Z_L | 0x80, Z),
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};
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struct da311_data {
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struct i2c_client *client;
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};
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static int da311_register_mask_write(struct i2c_client *client, u16 addr,
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u8 mask, u8 data)
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{
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int ret;
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u8 tmp_data = 0;
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if (addr & 0xff00) {
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/* Select bank 1 */
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ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x01);
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if (ret < 0)
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return ret;
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}
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if (mask != 0xff) {
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ret = i2c_smbus_read_byte_data(client, addr);
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if (ret < 0)
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return ret;
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tmp_data = ret;
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}
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tmp_data &= ~mask;
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tmp_data |= data & mask;
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ret = i2c_smbus_write_byte_data(client, addr & 0xff, tmp_data);
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if (ret < 0)
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return ret;
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if (addr & 0xff00) {
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/* Back to bank 0 */
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ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x00);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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/* Init sequence taken from the android driver */
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static int da311_reset(struct i2c_client *client)
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{
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static const struct {
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u16 addr;
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u8 mask;
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u8 data;
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} init_data[] = {
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{ DA311_REG_TEMP_CFG_REG, 0xff, 0x08 },
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{ DA311_REG_CTRL_REG5, 0xff, 0x80 },
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{ DA311_REG_CTRL_REG4, 0x30, 0x00 },
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{ DA311_REG_CTRL_REG1, 0xff, 0x6f },
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{ DA311_REG_TEMP_CFG_REG, 0xff, 0x88 },
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{ DA311_REG_LDO_REG, 0xff, 0x02 },
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{ DA311_REG_OTP_TRIM_OSC, 0xff, 0x27 },
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{ DA311_REG_LPF_ABSOLUTE, 0xff, 0x30 },
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{ DA311_REG_TEMP_OFF1, 0xff, 0x3f },
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{ DA311_REG_TEMP_OFF2, 0xff, 0xff },
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{ DA311_REG_TEMP_OFF3, 0xff, 0x0f },
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};
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int i, ret;
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/* Reset */
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ret = da311_register_mask_write(client, DA311_REG_SOFT_RESET,
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0xff, 0xaa);
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if (ret < 0)
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return ret;
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for (i = 0; i < ARRAY_SIZE(init_data); i++) {
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ret = da311_register_mask_write(client,
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init_data[i].addr,
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init_data[i].mask,
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init_data[i].data);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int da311_enable(struct i2c_client *client, bool enable)
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{
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u8 data = enable ? 0x00 : 0x20;
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return da311_register_mask_write(client, DA311_REG_TEMP_CFG_REG,
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0x20, data);
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}
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static int da311_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct da311_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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if (ret < 0)
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return ret;
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/*
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* Values are 12 bits, stored as 16 bits with the 4
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* least significant bits always 0.
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*/
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*val = (short)ret >> 4;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = da311_nscale;
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return IIO_VAL_INT_PLUS_NANO;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info da311_info = {
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.read_raw = da311_read_raw,
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};
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static void da311_disable(void *client)
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{
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da311_enable(client, false);
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}
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static int da311_probe(struct i2c_client *client)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct da311_data *data;
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ret = i2c_smbus_read_byte_data(client, DA311_REG_CHIP_ID);
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if (ret != DA311_CHIP_ID)
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return (ret < 0) ? ret : -ENODEV;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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data->client = client;
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indio_dev->info = &da311_info;
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indio_dev->name = "da311";
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = da311_channels;
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indio_dev->num_channels = ARRAY_SIZE(da311_channels);
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ret = da311_reset(client);
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if (ret < 0)
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return ret;
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ret = da311_enable(client, true);
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if (ret < 0)
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return ret;
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ret = devm_add_action_or_reset(&client->dev, da311_disable, client);
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if (ret)
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return ret;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static int da311_suspend(struct device *dev)
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{
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return da311_enable(to_i2c_client(dev), false);
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}
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static int da311_resume(struct device *dev)
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{
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return da311_enable(to_i2c_client(dev), true);
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(da311_pm_ops, da311_suspend, da311_resume);
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static const struct i2c_device_id da311_i2c_id[] = {
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{"da311", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, da311_i2c_id);
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static struct i2c_driver da311_driver = {
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.driver = {
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.name = "da311",
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.pm = pm_sleep_ptr(&da311_pm_ops),
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},
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.probe_new = da311_probe,
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.id_table = da311_i2c_id,
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};
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module_i2c_driver(da311_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver");
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MODULE_LICENSE("GPL v2");
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