xref: /openbmc/linux/drivers/iio/accel/dmard06.c (revision 7cf15f42)
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 
55 struct dmard06_data {
56 	struct i2c_client *client;
57 	u8 chip_id;
58 };
59 
60 static 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 
dmard06_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)67 static 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 
124 static const struct iio_info dmard06_info = {
125 	.read_raw	= dmard06_read_raw,
126 };
127 
dmard06_probe(struct i2c_client * client)128 static 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 		dev_err(&client->dev, "Failed to allocate iio device\n");
142 		return -ENOMEM;
143 	}
144 
145 	dmard06 = iio_priv(indio_dev);
146 	dmard06->client = client;
147 
148 	ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
149 	if (ret < 0) {
150 		dev_err(&client->dev, "Error reading chip id: %d\n", ret);
151 		return ret;
152 	}
153 
154 	if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
155 	    ret != DMARD07_CHIP_ID) {
156 		dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
157 		return -ENODEV;
158 	}
159 
160 	dmard06->chip_id = ret;
161 
162 	i2c_set_clientdata(client, indio_dev);
163 	indio_dev->name = DMARD06_DRV_NAME;
164 	indio_dev->modes = INDIO_DIRECT_MODE;
165 	indio_dev->channels = dmard06_channels;
166 	indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
167 	indio_dev->info = &dmard06_info;
168 
169 	return devm_iio_device_register(&client->dev, indio_dev);
170 }
171 
dmard06_suspend(struct device * dev)172 static int dmard06_suspend(struct device *dev)
173 {
174 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
175 	struct dmard06_data *dmard06 = iio_priv(indio_dev);
176 	int ret;
177 
178 	ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
179 					DMARD06_MODE_POWERDOWN);
180 	if (ret < 0)
181 		return ret;
182 
183 	return 0;
184 }
185 
dmard06_resume(struct device * dev)186 static int dmard06_resume(struct device *dev)
187 {
188 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
189 	struct dmard06_data *dmard06 = iio_priv(indio_dev);
190 	int ret;
191 
192 	ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
193 					DMARD06_MODE_NORMAL);
194 	if (ret < 0)
195 		return ret;
196 
197 	return 0;
198 }
199 
200 static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend,
201 				dmard06_resume);
202 
203 static const struct i2c_device_id dmard06_id[] = {
204 	{ "dmard05", 0 },
205 	{ "dmard06", 0 },
206 	{ "dmard07", 0 },
207 	{ }
208 };
209 MODULE_DEVICE_TABLE(i2c, dmard06_id);
210 
211 static const struct of_device_id dmard06_of_match[] = {
212 	{ .compatible = "domintech,dmard05" },
213 	{ .compatible = "domintech,dmard06" },
214 	{ .compatible = "domintech,dmard07" },
215 	{ }
216 };
217 MODULE_DEVICE_TABLE(of, dmard06_of_match);
218 
219 static struct i2c_driver dmard06_driver = {
220 	.probe = dmard06_probe,
221 	.id_table = dmard06_id,
222 	.driver = {
223 		.name = DMARD06_DRV_NAME,
224 		.of_match_table = dmard06_of_match,
225 		.pm = pm_sleep_ptr(&dmard06_pm_ops),
226 	},
227 };
228 module_i2c_driver(dmard06_driver);
229 
230 MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
231 MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
232 MODULE_LICENSE("GPL v2");
233