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11#include <linux/module.h>
12#include <linux/i2c.h>
13#include <linux/iio/iio.h>
14
15#define DMARD06_DRV_NAME "dmard06"
16
17
18#define DMARD06_CHIP_ID_REG 0x0f
19#define DMARD06_TOUT_REG 0x40
20#define DMARD06_XOUT_REG 0x41
21#define DMARD06_YOUT_REG 0x42
22#define DMARD06_ZOUT_REG 0x43
23#define DMARD06_CTRL1_REG 0x44
24
25
26#define DMARD05_CHIP_ID 0x05
27#define DMARD06_CHIP_ID 0x06
28#define DMARD07_CHIP_ID 0x07
29
30
31#define DMARD05_AXIS_SCALE_VAL 15625
32#define DMARD06_AXIS_SCALE_VAL 31250
33#define DMARD06_TEMP_CENTER_VAL 25
34#define DMARD06_SIGN_BIT 7
35
36
37#define DMARD06_MODE_NORMAL 0x27
38#define DMARD06_MODE_POWERDOWN 0x00
39
40
41#define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \
42 .type = IIO_ACCEL, \
43 .address = _reg, \
44 .channel2 = IIO_MOD_##_axis, \
45 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
46 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
47 .modified = 1, \
48}
49
50#define DMARD06_TEMP_CHANNEL(_reg) { \
51 .type = IIO_TEMP, \
52 .address = _reg, \
53 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
54 BIT(IIO_CHAN_INFO_OFFSET), \
55}
56
57struct dmard06_data {
58 struct i2c_client *client;
59 u8 chip_id;
60};
61
62static const struct iio_chan_spec dmard06_channels[] = {
63 DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
64 DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
65 DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
66 DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
67};
68
69static int dmard06_read_raw(struct iio_dev *indio_dev,
70 struct iio_chan_spec const *chan,
71 int *val, int *val2, long mask)
72{
73 struct dmard06_data *dmard06 = iio_priv(indio_dev);
74 int ret;
75
76 switch (mask) {
77 case IIO_CHAN_INFO_RAW:
78 ret = i2c_smbus_read_byte_data(dmard06->client,
79 chan->address);
80 if (ret < 0) {
81 dev_err(&dmard06->client->dev,
82 "Error reading data: %d\n", ret);
83 return ret;
84 }
85
86 *val = sign_extend32(ret, DMARD06_SIGN_BIT);
87
88 if (dmard06->chip_id == DMARD06_CHIP_ID)
89 *val = *val >> 1;
90
91 switch (chan->type) {
92 case IIO_ACCEL:
93 return IIO_VAL_INT;
94 case IIO_TEMP:
95 if (dmard06->chip_id != DMARD06_CHIP_ID)
96 *val = *val / 2;
97 return IIO_VAL_INT;
98 default:
99 return -EINVAL;
100 }
101 case IIO_CHAN_INFO_OFFSET:
102 switch (chan->type) {
103 case IIO_TEMP:
104 *val = DMARD06_TEMP_CENTER_VAL;
105 return IIO_VAL_INT;
106 default:
107 return -EINVAL;
108 }
109 case IIO_CHAN_INFO_SCALE:
110 switch (chan->type) {
111 case IIO_ACCEL:
112 *val = 0;
113 if (dmard06->chip_id == DMARD06_CHIP_ID)
114 *val2 = DMARD06_AXIS_SCALE_VAL;
115 else
116 *val2 = DMARD05_AXIS_SCALE_VAL;
117 return IIO_VAL_INT_PLUS_MICRO;
118 default:
119 return -EINVAL;
120 }
121 default:
122 return -EINVAL;
123 }
124}
125
126static const struct iio_info dmard06_info = {
127 .read_raw = dmard06_read_raw,
128};
129
130static int dmard06_probe(struct i2c_client *client,
131 const struct i2c_device_id *id)
132{
133 int ret;
134 struct iio_dev *indio_dev;
135 struct dmard06_data *dmard06;
136
137 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
138 dev_err(&client->dev, "I2C check functionality failed\n");
139 return -ENXIO;
140 }
141
142 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
143 if (!indio_dev) {
144 dev_err(&client->dev, "Failed to allocate iio device\n");
145 return -ENOMEM;
146 }
147
148 dmard06 = iio_priv(indio_dev);
149 dmard06->client = client;
150
151 ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
152 if (ret < 0) {
153 dev_err(&client->dev, "Error reading chip id: %d\n", ret);
154 return ret;
155 }
156
157 if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
158 ret != DMARD07_CHIP_ID) {
159 dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
160 return -ENODEV;
161 }
162
163 dmard06->chip_id = ret;
164
165 i2c_set_clientdata(client, indio_dev);
166 indio_dev->dev.parent = &client->dev;
167 indio_dev->name = DMARD06_DRV_NAME;
168 indio_dev->modes = INDIO_DIRECT_MODE;
169 indio_dev->channels = dmard06_channels;
170 indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
171 indio_dev->info = &dmard06_info;
172
173 return devm_iio_device_register(&client->dev, indio_dev);
174}
175
176#ifdef CONFIG_PM_SLEEP
177static int dmard06_suspend(struct device *dev)
178{
179 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
180 struct dmard06_data *dmard06 = iio_priv(indio_dev);
181 int ret;
182
183 ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
184 DMARD06_MODE_POWERDOWN);
185 if (ret < 0)
186 return ret;
187
188 return 0;
189}
190
191static int dmard06_resume(struct device *dev)
192{
193 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
194 struct dmard06_data *dmard06 = iio_priv(indio_dev);
195 int ret;
196
197 ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
198 DMARD06_MODE_NORMAL);
199 if (ret < 0)
200 return ret;
201
202 return 0;
203}
204
205static SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, dmard06_resume);
206#define DMARD06_PM_OPS (&dmard06_pm_ops)
207#else
208#define DMARD06_PM_OPS NULL
209#endif
210
211static const struct i2c_device_id dmard06_id[] = {
212 { "dmard05", 0 },
213 { "dmard06", 0 },
214 { "dmard07", 0 },
215 { }
216};
217MODULE_DEVICE_TABLE(i2c, dmard06_id);
218
219static const struct of_device_id dmard06_of_match[] = {
220 { .compatible = "domintech,dmard05" },
221 { .compatible = "domintech,dmard06" },
222 { .compatible = "domintech,dmard07" },
223 { }
224};
225MODULE_DEVICE_TABLE(of, dmard06_of_match);
226
227static struct i2c_driver dmard06_driver = {
228 .probe = dmard06_probe,
229 .id_table = dmard06_id,
230 .driver = {
231 .name = DMARD06_DRV_NAME,
232 .of_match_table = of_match_ptr(dmard06_of_match),
233 .pm = DMARD06_PM_OPS,
234 },
235};
236module_i2c_driver(dmard06_driver);
237
238MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
239MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
240MODULE_LICENSE("GPL v2");
241
