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12#include <linux/module.h>
13#include <linux/i2c.h>
14#include <linux/iio/iio.h>
15#include <linux/iio/sysfs.h>
16#include <linux/byteorder/generic.h>
17
18#define DA311_CHIP_ID 0x13
19
20
21
22
23
24
25
26
27#define DA311_REG_BANK 0x0000
28#define DA311_REG_LDO_REG 0x0006
29#define DA311_REG_CHIP_ID 0x000f
30#define DA311_REG_TEMP_CFG_REG 0x001f
31#define DA311_REG_CTRL_REG1 0x0020
32#define DA311_REG_CTRL_REG3 0x0022
33#define DA311_REG_CTRL_REG4 0x0023
34#define DA311_REG_CTRL_REG5 0x0024
35#define DA311_REG_CTRL_REG6 0x0025
36#define DA311_REG_STATUS_REG 0x0027
37#define DA311_REG_OUT_X_L 0x0028
38#define DA311_REG_OUT_X_H 0x0029
39#define DA311_REG_OUT_Y_L 0x002a
40#define DA311_REG_OUT_Y_H 0x002b
41#define DA311_REG_OUT_Z_L 0x002c
42#define DA311_REG_OUT_Z_H 0x002d
43#define DA311_REG_INT1_CFG 0x0030
44#define DA311_REG_INT1_SRC 0x0031
45#define DA311_REG_INT1_THS 0x0032
46#define DA311_REG_INT1_DURATION 0x0033
47#define DA311_REG_INT2_CFG 0x0034
48#define DA311_REG_INT2_SRC 0x0035
49#define DA311_REG_INT2_THS 0x0036
50#define DA311_REG_INT2_DURATION 0x0037
51#define DA311_REG_CLICK_CFG 0x0038
52#define DA311_REG_CLICK_SRC 0x0039
53#define DA311_REG_CLICK_THS 0x003a
54#define DA311_REG_TIME_LIMIT 0x003b
55#define DA311_REG_TIME_LATENCY 0x003c
56#define DA311_REG_TIME_WINDOW 0x003d
57
58
59#define DA311_REG_SOFT_RESET 0x0105
60#define DA311_REG_OTP_XOFF_L 0x0110
61#define DA311_REG_OTP_XOFF_H 0x0111
62#define DA311_REG_OTP_YOFF_L 0x0112
63#define DA311_REG_OTP_YOFF_H 0x0113
64#define DA311_REG_OTP_ZOFF_L 0x0114
65#define DA311_REG_OTP_ZOFF_H 0x0115
66#define DA311_REG_OTP_XSO 0x0116
67#define DA311_REG_OTP_YSO 0x0117
68#define DA311_REG_OTP_ZSO 0x0118
69#define DA311_REG_OTP_TRIM_OSC 0x011b
70#define DA311_REG_LPF_ABSOLUTE 0x011c
71#define DA311_REG_TEMP_OFF1 0x0127
72#define DA311_REG_TEMP_OFF2 0x0128
73#define DA311_REG_TEMP_OFF3 0x0129
74#define DA311_REG_OTP_TRIM_THERM_H 0x011a
75
76
77
78
79
80
81static const int da311_nscale = 9580078;
82
83#define DA311_CHANNEL(reg, axis) { \
84 .type = IIO_ACCEL, \
85 .address = reg, \
86 .modified = 1, \
87 .channel2 = IIO_MOD_##axis, \
88 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
89 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
90}
91
92static const struct iio_chan_spec da311_channels[] = {
93
94 DA311_CHANNEL(DA311_REG_OUT_X_L | 0x80, X),
95 DA311_CHANNEL(DA311_REG_OUT_Y_L | 0x80, Y),
96 DA311_CHANNEL(DA311_REG_OUT_Z_L | 0x80, Z),
97};
98
99struct da311_data {
100 struct i2c_client *client;
101};
102
103static int da311_register_mask_write(struct i2c_client *client, u16 addr,
104 u8 mask, u8 data)
105{
106 int ret;
107 u8 tmp_data = 0;
108
109 if (addr & 0xff00) {
110
111 ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x01);
112 if (ret < 0)
113 return ret;
114 }
115
116 if (mask != 0xff) {
117 ret = i2c_smbus_read_byte_data(client, addr);
118 if (ret < 0)
119 return ret;
120 tmp_data = ret;
121 }
122
123 tmp_data &= ~mask;
124 tmp_data |= data & mask;
125 ret = i2c_smbus_write_byte_data(client, addr & 0xff, tmp_data);
126 if (ret < 0)
127 return ret;
128
129 if (addr & 0xff00) {
130
131 ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x00);
132 if (ret < 0)
133 return ret;
134 }
135
136 return 0;
137}
138
139
140static int da311_reset(struct i2c_client *client)
141{
142 static const struct {
143 u16 addr;
144 u8 mask;
145 u8 data;
146 } init_data[] = {
147 { DA311_REG_TEMP_CFG_REG, 0xff, 0x08 },
148 { DA311_REG_CTRL_REG5, 0xff, 0x80 },
149 { DA311_REG_CTRL_REG4, 0x30, 0x00 },
150 { DA311_REG_CTRL_REG1, 0xff, 0x6f },
151 { DA311_REG_TEMP_CFG_REG, 0xff, 0x88 },
152 { DA311_REG_LDO_REG, 0xff, 0x02 },
153 { DA311_REG_OTP_TRIM_OSC, 0xff, 0x27 },
154 { DA311_REG_LPF_ABSOLUTE, 0xff, 0x30 },
155 { DA311_REG_TEMP_OFF1, 0xff, 0x3f },
156 { DA311_REG_TEMP_OFF2, 0xff, 0xff },
157 { DA311_REG_TEMP_OFF3, 0xff, 0x0f },
158 };
159 int i, ret;
160
161
162 ret = da311_register_mask_write(client, DA311_REG_SOFT_RESET,
163 0xff, 0xaa);
164 if (ret < 0)
165 return ret;
166
167 for (i = 0; i < ARRAY_SIZE(init_data); i++) {
168 ret = da311_register_mask_write(client,
169 init_data[i].addr,
170 init_data[i].mask,
171 init_data[i].data);
172 if (ret < 0)
173 return ret;
174 }
175
176 return 0;
177}
178
179static int da311_enable(struct i2c_client *client, bool enable)
180{
181 u8 data = enable ? 0x00 : 0x20;
182
183 return da311_register_mask_write(client, DA311_REG_TEMP_CFG_REG,
184 0x20, data);
185}
186
187static int da311_read_raw(struct iio_dev *indio_dev,
188 struct iio_chan_spec const *chan,
189 int *val, int *val2, long mask)
190{
191 struct da311_data *data = iio_priv(indio_dev);
192 int ret;
193
194 switch (mask) {
195 case IIO_CHAN_INFO_RAW:
196 ret = i2c_smbus_read_word_data(data->client, chan->address);
197 if (ret < 0)
198 return ret;
199
200
201
202
203 *val = (short)ret >> 4;
204 return IIO_VAL_INT;
205 case IIO_CHAN_INFO_SCALE:
206 *val = 0;
207 *val2 = da311_nscale;
208 return IIO_VAL_INT_PLUS_NANO;
209 default:
210 return -EINVAL;
211 }
212}
213
214static const struct iio_info da311_info = {
215 .read_raw = da311_read_raw,
216};
217
218static int da311_probe(struct i2c_client *client,
219 const struct i2c_device_id *id)
220{
221 int ret;
222 struct iio_dev *indio_dev;
223 struct da311_data *data;
224
225 ret = i2c_smbus_read_byte_data(client, DA311_REG_CHIP_ID);
226 if (ret != DA311_CHIP_ID)
227 return (ret < 0) ? ret : -ENODEV;
228
229 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
230 if (!indio_dev)
231 return -ENOMEM;
232
233 data = iio_priv(indio_dev);
234 data->client = client;
235 i2c_set_clientdata(client, indio_dev);
236
237 indio_dev->dev.parent = &client->dev;
238 indio_dev->info = &da311_info;
239 indio_dev->name = "da311";
240 indio_dev->modes = INDIO_DIRECT_MODE;
241 indio_dev->channels = da311_channels;
242 indio_dev->num_channels = ARRAY_SIZE(da311_channels);
243
244 ret = da311_reset(client);
245 if (ret < 0)
246 return ret;
247
248 ret = da311_enable(client, true);
249 if (ret < 0)
250 return ret;
251
252 ret = iio_device_register(indio_dev);
253 if (ret < 0) {
254 dev_err(&client->dev, "device_register failed\n");
255 da311_enable(client, false);
256 }
257
258 return ret;
259}
260
261static int da311_remove(struct i2c_client *client)
262{
263 struct iio_dev *indio_dev = i2c_get_clientdata(client);
264
265 iio_device_unregister(indio_dev);
266
267 return da311_enable(client, false);
268}
269
270#ifdef CONFIG_PM_SLEEP
271static int da311_suspend(struct device *dev)
272{
273 return da311_enable(to_i2c_client(dev), false);
274}
275
276static int da311_resume(struct device *dev)
277{
278 return da311_enable(to_i2c_client(dev), true);
279}
280#endif
281
282static SIMPLE_DEV_PM_OPS(da311_pm_ops, da311_suspend, da311_resume);
283
284static const struct i2c_device_id da311_i2c_id[] = {
285 {"da311", 0},
286 {}
287};
288MODULE_DEVICE_TABLE(i2c, da311_i2c_id);
289
290static struct i2c_driver da311_driver = {
291 .driver = {
292 .name = "da311",
293 .pm = &da311_pm_ops,
294 },
295 .probe = da311_probe,
296 .remove = da311_remove,
297 .id_table = da311_i2c_id,
298};
299
300module_i2c_driver(da311_driver);
301
302MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
303MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver");
304MODULE_LICENSE("GPL v2");
305
