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