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,const struct i2c_device_id * id)127 static int dmard06_probe(struct i2c_client *client,
128 const struct i2c_device_id *id)
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->dev.parent = &client->dev;
164 indio_dev->name = DMARD06_DRV_NAME;
165 indio_dev->modes = INDIO_DIRECT_MODE;
166 indio_dev->channels = dmard06_channels;
167 indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
168 indio_dev->info = &dmard06_info;
169
170 return devm_iio_device_register(&client->dev, indio_dev);
171 }
172
173 #ifdef CONFIG_PM_SLEEP
dmard06_suspend(struct device * dev)174 static int dmard06_suspend(struct device *dev)
175 {
176 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
177 struct dmard06_data *dmard06 = iio_priv(indio_dev);
178 int ret;
179
180 ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
181 DMARD06_MODE_POWERDOWN);
182 if (ret < 0)
183 return ret;
184
185 return 0;
186 }
187
dmard06_resume(struct device * dev)188 static int dmard06_resume(struct device *dev)
189 {
190 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
191 struct dmard06_data *dmard06 = iio_priv(indio_dev);
192 int ret;
193
194 ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
195 DMARD06_MODE_NORMAL);
196 if (ret < 0)
197 return ret;
198
199 return 0;
200 }
201
202 static SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, dmard06_resume);
203 #define DMARD06_PM_OPS (&dmard06_pm_ops)
204 #else
205 #define DMARD06_PM_OPS NULL
206 #endif
207
208 static const struct i2c_device_id dmard06_id[] = {
209 { "dmard05", 0 },
210 { "dmard06", 0 },
211 { "dmard07", 0 },
212 { }
213 };
214 MODULE_DEVICE_TABLE(i2c, dmard06_id);
215
216 static const struct of_device_id dmard06_of_match[] = {
217 { .compatible = "domintech,dmard05" },
218 { .compatible = "domintech,dmard06" },
219 { .compatible = "domintech,dmard07" },
220 { }
221 };
222 MODULE_DEVICE_TABLE(of, dmard06_of_match);
223
224 static struct i2c_driver dmard06_driver = {
225 .probe = dmard06_probe,
226 .id_table = dmard06_id,
227 .driver = {
228 .name = DMARD06_DRV_NAME,
229 .of_match_table = of_match_ptr(dmard06_of_match),
230 .pm = DMARD06_PM_OPS,
231 },
232 };
233 module_i2c_driver(dmard06_driver);
234
235 MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
236 MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
237 MODULE_LICENSE("GPL v2");
238
