dmard06.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * IIO driver for Domintech DMARD06 accelerometer
  4 *
  5 * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/mod_devicetable.h>
 10#include <linux/i2c.h>
 11#include <linux/iio/iio.h>
 12
 13#define DMARD06_DRV_NAME		"dmard06"
 14
 15/* Device data registers */
 16#define DMARD06_CHIP_ID_REG		0x0f
 17#define DMARD06_TOUT_REG		0x40
 18#define DMARD06_XOUT_REG		0x41
 19#define DMARD06_YOUT_REG		0x42
 20#define DMARD06_ZOUT_REG		0x43
 21#define DMARD06_CTRL1_REG		0x44
 22
 23/* Device ID value */
 24#define DMARD05_CHIP_ID			0x05
 25#define DMARD06_CHIP_ID			0x06
 26#define DMARD07_CHIP_ID			0x07
 27
 28/* Device values */
 29#define DMARD05_AXIS_SCALE_VAL		15625
 30#define DMARD06_AXIS_SCALE_VAL		31250
 31#define DMARD06_TEMP_CENTER_VAL		25
 32#define DMARD06_SIGN_BIT		7
 33
 34/* Device power modes */
 35#define DMARD06_MODE_NORMAL		0x27
 36#define DMARD06_MODE_POWERDOWN		0x00
 37
 38/* Device channels */
 39#define DMARD06_ACCEL_CHANNEL(_axis, _reg) {			\
 40	.type = IIO_ACCEL,					\
 41	.address = _reg,					\
 42	.channel2 = IIO_MOD_##_axis,				\
 43	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
 44	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
 45	.modified = 1,						\
 46}
 47
 48#define DMARD06_TEMP_CHANNEL(_reg) {				\
 49	.type = IIO_TEMP,					\
 50	.address = _reg,					\
 51	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
 52			      BIT(IIO_CHAN_INFO_OFFSET),	\
 53}
 54
 55struct dmard06_data {
 56	struct i2c_client *client;
 57	u8 chip_id;
 58};
 59
 60static const struct iio_chan_spec dmard06_channels[] = {
 61	DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
 62	DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
 63	DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
 64	DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
 65};
 66
 67static int dmard06_read_raw(struct iio_dev *indio_dev,
 68			    struct iio_chan_spec const *chan,
 69			    int *val, int *val2, long mask)
 70{
 71	struct dmard06_data *dmard06 = iio_priv(indio_dev);
 72	int ret;
 73
 74	switch (mask) {
 75	case IIO_CHAN_INFO_RAW:
 76		ret = i2c_smbus_read_byte_data(dmard06->client,
 77					       chan->address);
 78		if (ret < 0) {
 79			dev_err(&dmard06->client->dev,
 80				"Error reading data: %d\n", ret);
 81			return ret;
 82		}
 83
 84		*val = sign_extend32(ret, DMARD06_SIGN_BIT);
 85
 86		if (dmard06->chip_id == DMARD06_CHIP_ID)
 87			*val = *val >> 1;
 88
 89		switch (chan->type) {
 90		case IIO_ACCEL:
 91			return IIO_VAL_INT;
 92		case IIO_TEMP:
 93			if (dmard06->chip_id != DMARD06_CHIP_ID)
 94				*val = *val / 2;
 95			return IIO_VAL_INT;
 96		default:
 97			return -EINVAL;
 98		}
 99	case IIO_CHAN_INFO_OFFSET:
100		switch (chan->type) {
101		case IIO_TEMP:
102			*val = DMARD06_TEMP_CENTER_VAL;
103			return IIO_VAL_INT;
104		default:
105			return -EINVAL;
106		}
107	case IIO_CHAN_INFO_SCALE:
108		switch (chan->type) {
109		case IIO_ACCEL:
110			*val = 0;
111			if (dmard06->chip_id == DMARD06_CHIP_ID)
112				*val2 = DMARD06_AXIS_SCALE_VAL;
113			else
114				*val2 = DMARD05_AXIS_SCALE_VAL;
115			return IIO_VAL_INT_PLUS_MICRO;
116		default:
117			return -EINVAL;
118		}
119	default:
120		return -EINVAL;
121	}
122}
123
124static const struct iio_info dmard06_info = {
125	.read_raw	= dmard06_read_raw,
126};
127
128static int dmard06_probe(struct i2c_client *client)
129{
130	int ret;
131	struct iio_dev *indio_dev;
132	struct dmard06_data *dmard06;
133
134	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
135		dev_err(&client->dev, "I2C check functionality failed\n");
136		return -ENXIO;
137	}
138
139	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
140	if (!indio_dev)
141		return -ENOMEM;
142
143	dmard06 = iio_priv(indio_dev);
144	dmard06->client = client;
145
146	ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
147	if (ret < 0) {
148		dev_err(&client->dev, "Error reading chip id: %d\n", ret);
149		return ret;
150	}
151
152	if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
153	    ret != DMARD07_CHIP_ID) {
154		dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
155		return -ENODEV;
156	}
157
158	dmard06->chip_id = ret;
159
160	i2c_set_clientdata(client, indio_dev);
161	indio_dev->name = DMARD06_DRV_NAME;
162	indio_dev->modes = INDIO_DIRECT_MODE;
163	indio_dev->channels = dmard06_channels;
164	indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
165	indio_dev->info = &dmard06_info;
166
167	return devm_iio_device_register(&client->dev, indio_dev);
168}
169
170static int dmard06_suspend(struct device *dev)
171{
172	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
173	struct dmard06_data *dmard06 = iio_priv(indio_dev);
174	int ret;
175
176	ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
177					DMARD06_MODE_POWERDOWN);
178	if (ret < 0)
179		return ret;
180
181	return 0;
182}
183
184static int dmard06_resume(struct device *dev)
185{
186	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
187	struct dmard06_data *dmard06 = iio_priv(indio_dev);
188	int ret;
189
190	ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
191					DMARD06_MODE_NORMAL);
192	if (ret < 0)
193		return ret;
194
195	return 0;
196}
197
198static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend,
199				dmard06_resume);
200
201static const struct i2c_device_id dmard06_id[] = {
202	{ "dmard05" },
203	{ "dmard06" },
204	{ "dmard07" },
205	{ }
206};
207MODULE_DEVICE_TABLE(i2c, dmard06_id);
208
209static const struct of_device_id dmard06_of_match[] = {
210	{ .compatible = "domintech,dmard05" },
211	{ .compatible = "domintech,dmard06" },
212	{ .compatible = "domintech,dmard07" },
213	{ }
214};
215MODULE_DEVICE_TABLE(of, dmard06_of_match);
216
217static struct i2c_driver dmard06_driver = {
218	.probe = dmard06_probe,
219	.id_table = dmard06_id,
220	.driver = {
221		.name = DMARD06_DRV_NAME,
222		.of_match_table = dmard06_of_match,
223		.pm = pm_sleep_ptr(&dmard06_pm_ops),
224	},
225};
226module_i2c_driver(dmard06_driver);
227
228MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
229MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
230MODULE_LICENSE("GPL v2");