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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
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
24#define DMARD05_CHIP_ID 0x05
25#define DMARD06_CHIP_ID 0x06
26#define DMARD07_CHIP_ID 0x07
27
28
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
35#define DMARD06_MODE_NORMAL 0x27
36#define DMARD06_MODE_POWERDOWN 0x00
37
38
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
55struct dmard06_data {
56 struct i2c_client *client;
57 u8 chip_id;
58};
59
60static 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
67static 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
124static const struct iio_info dmard06_info = {
125 .read_raw = dmard06_read_raw,
126};
127
128static int dmard06_probe(struct i2c_client *client,
129 const struct i2c_device_id *id)
130{
131 int ret;
132 struct iio_dev *indio_dev;
133 struct dmard06_data *dmard06;
134
135 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
136 dev_err(&client->dev, "I2C check functionality failed\n");
137 return -ENXIO;
138 }
139
140 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
141 if (!indio_dev) {
142 dev_err(&client->dev, "Failed to allocate iio device\n");
143 return -ENOMEM;
144 }
145
146 dmard06 = iio_priv(indio_dev);
147 dmard06->client = client;
148
149 ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
150 if (ret < 0) {
151 dev_err(&client->dev, "Error reading chip id: %d\n", ret);
152 return ret;
153 }
154
155 if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
156 ret != DMARD07_CHIP_ID) {
157 dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
158 return -ENODEV;
159 }
160
161 dmard06->chip_id = ret;
162
163 i2c_set_clientdata(client, indio_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
174static 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
188static 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
202static 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
208static const struct i2c_device_id dmard06_id[] = {
209 { "dmard05", 0 },
210 { "dmard06", 0 },
211 { "dmard07", 0 },
212 { }
213};
214MODULE_DEVICE_TABLE(i2c, dmard06_id);
215
216static const struct of_device_id dmard06_of_match[] = {
217 { .compatible = "domintech,dmard05" },
218 { .compatible = "domintech,dmard06" },
219 { .compatible = "domintech,dmard07" },
220 { }
221};
222MODULE_DEVICE_TABLE(of, dmard06_of_match);
223
224static 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 = dmard06_of_match,
230 .pm = DMARD06_PM_OPS,
231 },
232};
233module_i2c_driver(dmard06_driver);
234
235MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
236MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
237MODULE_LICENSE("GPL v2");
238
