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