// SPDX-License-Identifier: GPL-2.0-only /** * IIO driver for the MiraMEMS DA311 3-axis accelerometer * * Copyright (c) 2016 Hans de Goede * Copyright (c) 2011-2013 MiraMEMS Sensing Technology Co., Ltd. */ #include #include #include #include #include #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 = 9.81 / 1024 = 0.009580078 */ static const int da311_nscale = 9580078; #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) { static 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); 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 12 bits, stored as 16 bits with the 4 * least significant bits always 0. */ *val = (short)ret >> 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 = { .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) 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 "); MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver"); MODULE_LICENSE("GPL v2");