summaryrefslogtreecommitdiffstats
path: root/drivers/iio/magnetometer/st_magn_core.c
blob: 52bbcfa1e07795208b45633ced62de0015772b74 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
/*
 * STMicroelectronics magnetometers driver
 *
 * Copyright 2012-2013 STMicroelectronics Inc.
 *
 * Denis Ciocca <denis.ciocca@st.com>
 *
 * Licensed under the GPL-2.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>

#include <linux/iio/common/st_sensors.h>
#include "st_magn.h"

#define ST_MAGN_NUMBER_DATA_CHANNELS		3

/* DEFAULT VALUE FOR SENSORS */
#define ST_MAGN_DEFAULT_OUT_X_H_ADDR		0X03
#define ST_MAGN_DEFAULT_OUT_Y_H_ADDR		0X07
#define ST_MAGN_DEFAULT_OUT_Z_H_ADDR		0X05

/* FULLSCALE */
#define ST_MAGN_FS_AVL_1300MG			1300
#define ST_MAGN_FS_AVL_1900MG			1900
#define ST_MAGN_FS_AVL_2500MG			2500
#define ST_MAGN_FS_AVL_4000MG			4000
#define ST_MAGN_FS_AVL_4700MG			4700
#define ST_MAGN_FS_AVL_5600MG			5600
#define ST_MAGN_FS_AVL_8000MG			8000
#define ST_MAGN_FS_AVL_8100MG			8100
#define ST_MAGN_FS_AVL_10000MG			10000

/* CUSTOM VALUES FOR SENSOR 1 */
#define ST_MAGN_1_WAI_EXP			0x3c
#define ST_MAGN_1_ODR_ADDR			0x00
#define ST_MAGN_1_ODR_MASK			0x1c
#define ST_MAGN_1_ODR_AVL_1HZ_VAL		0x00
#define ST_MAGN_1_ODR_AVL_2HZ_VAL		0x01
#define ST_MAGN_1_ODR_AVL_3HZ_VAL		0x02
#define ST_MAGN_1_ODR_AVL_8HZ_VAL		0x03
#define ST_MAGN_1_ODR_AVL_15HZ_VAL		0x04
#define ST_MAGN_1_ODR_AVL_30HZ_VAL		0x05
#define ST_MAGN_1_ODR_AVL_75HZ_VAL		0x06
#define ST_MAGN_1_ODR_AVL_220HZ_VAL		0x07
#define ST_MAGN_1_PW_ADDR			0x02
#define ST_MAGN_1_PW_MASK			0x03
#define ST_MAGN_1_PW_ON				0x00
#define ST_MAGN_1_PW_OFF			0x03
#define ST_MAGN_1_FS_ADDR			0x01
#define ST_MAGN_1_FS_MASK			0xe0
#define ST_MAGN_1_FS_AVL_1300_VAL		0x01
#define ST_MAGN_1_FS_AVL_1900_VAL		0x02
#define ST_MAGN_1_FS_AVL_2500_VAL		0x03
#define ST_MAGN_1_FS_AVL_4000_VAL		0x04
#define ST_MAGN_1_FS_AVL_4700_VAL		0x05
#define ST_MAGN_1_FS_AVL_5600_VAL		0x06
#define ST_MAGN_1_FS_AVL_8100_VAL		0x07
#define ST_MAGN_1_FS_AVL_1300_GAIN_XY		1100
#define ST_MAGN_1_FS_AVL_1900_GAIN_XY		855
#define ST_MAGN_1_FS_AVL_2500_GAIN_XY		670
#define ST_MAGN_1_FS_AVL_4000_GAIN_XY		450
#define ST_MAGN_1_FS_AVL_4700_GAIN_XY		400
#define ST_MAGN_1_FS_AVL_5600_GAIN_XY		330
#define ST_MAGN_1_FS_AVL_8100_GAIN_XY		230
#define ST_MAGN_1_FS_AVL_1300_GAIN_Z		980
#define ST_MAGN_1_FS_AVL_1900_GAIN_Z		760
#define ST_MAGN_1_FS_AVL_2500_GAIN_Z		600
#define ST_MAGN_1_FS_AVL_4000_GAIN_Z		400
#define ST_MAGN_1_FS_AVL_4700_GAIN_Z		355
#define ST_MAGN_1_FS_AVL_5600_GAIN_Z		295
#define ST_MAGN_1_FS_AVL_8100_GAIN_Z		205
#define ST_MAGN_1_MULTIREAD_BIT			false

/* CUSTOM VALUES FOR SENSOR 2 */
#define ST_MAGN_2_WAI_EXP			0x3d
#define ST_MAGN_2_ODR_ADDR			0x20
#define ST_MAGN_2_ODR_MASK			0x1c
#define ST_MAGN_2_ODR_AVL_1HZ_VAL		0x00
#define ST_MAGN_2_ODR_AVL_2HZ_VAL		0x01
#define ST_MAGN_2_ODR_AVL_3HZ_VAL		0x02
#define ST_MAGN_2_ODR_AVL_5HZ_VAL		0x03
#define ST_MAGN_2_ODR_AVL_10HZ_VAL		0x04
#define ST_MAGN_2_ODR_AVL_20HZ_VAL		0x05
#define ST_MAGN_2_ODR_AVL_40HZ_VAL		0x06
#define ST_MAGN_2_ODR_AVL_80HZ_VAL		0x07
#define ST_MAGN_2_PW_ADDR			0x22
#define ST_MAGN_2_PW_MASK			0x03
#define ST_MAGN_2_PW_ON				0x00
#define ST_MAGN_2_PW_OFF			0x03
#define ST_MAGN_2_FS_ADDR			0x21
#define ST_MAGN_2_FS_MASK			0x60
#define ST_MAGN_2_FS_AVL_4000_VAL		0x00
#define ST_MAGN_2_FS_AVL_8000_VAL		0x01
#define ST_MAGN_2_FS_AVL_10000_VAL		0x02
#define ST_MAGN_2_FS_AVL_4000_GAIN		430
#define ST_MAGN_2_FS_AVL_8000_GAIN		230
#define ST_MAGN_2_FS_AVL_10000_GAIN		230
#define ST_MAGN_2_MULTIREAD_BIT			false
#define ST_MAGN_2_OUT_X_L_ADDR			0x28
#define ST_MAGN_2_OUT_Y_L_ADDR			0x2a
#define ST_MAGN_2_OUT_Z_L_ADDR			0x2c

static const struct iio_chan_spec st_magn_16bit_channels[] = {
	ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
			ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16,
			ST_MAGN_DEFAULT_OUT_X_H_ADDR),
	ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
			ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16,
			ST_MAGN_DEFAULT_OUT_Y_H_ADDR),
	ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
			ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16,
			ST_MAGN_DEFAULT_OUT_Z_H_ADDR),
	IIO_CHAN_SOFT_TIMESTAMP(3)
};

static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
	ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
			ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
			ST_MAGN_2_OUT_X_L_ADDR),
	ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
			ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
			ST_MAGN_2_OUT_Y_L_ADDR),
	ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
			ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
			ST_MAGN_2_OUT_Z_L_ADDR),
	IIO_CHAN_SOFT_TIMESTAMP(3)
};

static const struct st_sensors st_magn_sensors[] = {
	{
		.wai = ST_MAGN_1_WAI_EXP,
		.sensors_supported = {
			[0] = LSM303DLHC_MAGN_DEV_NAME,
			[1] = LSM303DLM_MAGN_DEV_NAME,
		},
		.ch = (struct iio_chan_spec *)st_magn_16bit_channels,
		.odr = {
			.addr = ST_MAGN_1_ODR_ADDR,
			.mask = ST_MAGN_1_ODR_MASK,
			.odr_avl = {
				{ 1, ST_MAGN_1_ODR_AVL_1HZ_VAL, },
				{ 2, ST_MAGN_1_ODR_AVL_2HZ_VAL, },
				{ 3, ST_MAGN_1_ODR_AVL_3HZ_VAL, },
				{ 8, ST_MAGN_1_ODR_AVL_8HZ_VAL, },
				{ 15, ST_MAGN_1_ODR_AVL_15HZ_VAL, },
				{ 30, ST_MAGN_1_ODR_AVL_30HZ_VAL, },
				{ 75, ST_MAGN_1_ODR_AVL_75HZ_VAL, },
				{ 220, ST_MAGN_1_ODR_AVL_220HZ_VAL, },
			},
		},
		.pw = {
			.addr = ST_MAGN_1_PW_ADDR,
			.mask = ST_MAGN_1_PW_MASK,
			.value_on = ST_MAGN_1_PW_ON,
			.value_off = ST_MAGN_1_PW_OFF,
		},
		.fs = {
			.addr = ST_MAGN_1_FS_ADDR,
			.mask = ST_MAGN_1_FS_MASK,
			.fs_avl = {
				[0] = {
					.num = ST_MAGN_FS_AVL_1300MG,
					.value = ST_MAGN_1_FS_AVL_1300_VAL,
					.gain = ST_MAGN_1_FS_AVL_1300_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_1300_GAIN_Z,
				},
				[1] = {
					.num = ST_MAGN_FS_AVL_1900MG,
					.value = ST_MAGN_1_FS_AVL_1900_VAL,
					.gain = ST_MAGN_1_FS_AVL_1900_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_1900_GAIN_Z,
				},
				[2] = {
					.num = ST_MAGN_FS_AVL_2500MG,
					.value = ST_MAGN_1_FS_AVL_2500_VAL,
					.gain = ST_MAGN_1_FS_AVL_2500_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_2500_GAIN_Z,
				},
				[3] = {
					.num = ST_MAGN_FS_AVL_4000MG,
					.value = ST_MAGN_1_FS_AVL_4000_VAL,
					.gain = ST_MAGN_1_FS_AVL_4000_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_4000_GAIN_Z,
				},
				[4] = {
					.num = ST_MAGN_FS_AVL_4700MG,
					.value = ST_MAGN_1_FS_AVL_4700_VAL,
					.gain = ST_MAGN_1_FS_AVL_4700_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_4700_GAIN_Z,
				},
				[5] = {
					.num = ST_MAGN_FS_AVL_5600MG,
					.value = ST_MAGN_1_FS_AVL_5600_VAL,
					.gain = ST_MAGN_1_FS_AVL_5600_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_5600_GAIN_Z,
				},
				[6] = {
					.num = ST_MAGN_FS_AVL_8100MG,
					.value = ST_MAGN_1_FS_AVL_8100_VAL,
					.gain = ST_MAGN_1_FS_AVL_8100_GAIN_XY,
					.gain2 = ST_MAGN_1_FS_AVL_8100_GAIN_Z,
				},
			},
		},
		.multi_read_bit = ST_MAGN_1_MULTIREAD_BIT,
		.bootime = 2,
	},
	{
		.wai = ST_MAGN_2_WAI_EXP,
		.sensors_supported = {
			[0] = LIS3MDL_MAGN_DEV_NAME,
		},
		.ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
		.odr = {
			.addr = ST_MAGN_2_ODR_ADDR,
			.mask = ST_MAGN_2_ODR_MASK,
			.odr_avl = {
				{ 1, ST_MAGN_2_ODR_AVL_1HZ_VAL, },
				{ 2, ST_MAGN_2_ODR_AVL_2HZ_VAL, },
				{ 3, ST_MAGN_2_ODR_AVL_3HZ_VAL, },
				{ 5, ST_MAGN_2_ODR_AVL_5HZ_VAL, },
				{ 10, ST_MAGN_2_ODR_AVL_10HZ_VAL, },
				{ 20, ST_MAGN_2_ODR_AVL_20HZ_VAL, },
				{ 40, ST_MAGN_2_ODR_AVL_40HZ_VAL, },
				{ 80, ST_MAGN_2_ODR_AVL_80HZ_VAL, },
			},
		},
		.pw = {
			.addr = ST_MAGN_2_PW_ADDR,
			.mask = ST_MAGN_2_PW_MASK,
			.value_on = ST_MAGN_2_PW_ON,
			.value_off = ST_MAGN_2_PW_OFF,
		},
		.fs = {
			.addr = ST_MAGN_2_FS_ADDR,
			.mask = ST_MAGN_2_FS_MASK,
			.fs_avl = {
				[0] = {
					.num = ST_MAGN_FS_AVL_4000MG,
					.value = ST_MAGN_2_FS_AVL_4000_VAL,
					.gain = ST_MAGN_2_FS_AVL_4000_GAIN,
				},
				[1] = {
					.num = ST_MAGN_FS_AVL_8000MG,
					.value = ST_MAGN_2_FS_AVL_8000_VAL,
					.gain = ST_MAGN_2_FS_AVL_8000_GAIN,
				},
				[2] = {
					.num = ST_MAGN_FS_AVL_10000MG,
					.value = ST_MAGN_2_FS_AVL_10000_VAL,
					.gain = ST_MAGN_2_FS_AVL_10000_GAIN,
				},
			},
		},
		.multi_read_bit = ST_MAGN_2_MULTIREAD_BIT,
		.bootime = 2,
	},
};

static int st_magn_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *ch, int *val,
							int *val2, long mask)
{
	int err;
	struct st_sensor_data *mdata = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		err = st_sensors_read_info_raw(indio_dev, ch, val);
		if (err < 0)
			goto read_error;

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		if ((ch->scan_index == ST_SENSORS_SCAN_Z) &&
					(mdata->current_fullscale->gain2 != 0))
			*val2 = mdata->current_fullscale->gain2;
		else
			*val2 = mdata->current_fullscale->gain;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}

read_error:
	return err;
}

static int st_magn_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan, int val, int val2, long mask)
{
	int err;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
		break;
	default:
		err = -EINVAL;
	}

	return err;
}

static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available);

static struct attribute *st_magn_attributes[] = {
	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
	&iio_dev_attr_in_magn_scale_available.dev_attr.attr,
	&iio_dev_attr_sampling_frequency.dev_attr.attr,
	NULL,
};

static const struct attribute_group st_magn_attribute_group = {
	.attrs = st_magn_attributes,
};

static const struct iio_info magn_info = {
	.driver_module = THIS_MODULE,
	.attrs = &st_magn_attribute_group,
	.read_raw = &st_magn_read_raw,
	.write_raw = &st_magn_write_raw,
};

int st_magn_common_probe(struct iio_dev *indio_dev,
					struct st_sensors_platform_data *pdata)
{
	struct st_sensor_data *mdata = iio_priv(indio_dev);
	int irq = mdata->get_irq_data_ready(indio_dev);
	int err;

	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &magn_info;

	err = st_sensors_check_device_support(indio_dev,
				ARRAY_SIZE(st_magn_sensors), st_magn_sensors);
	if (err < 0)
		return err;

	mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
	mdata->multiread_bit = mdata->sensor->multi_read_bit;
	indio_dev->channels = mdata->sensor->ch;
	indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;

	mdata->current_fullscale = (struct st_sensor_fullscale_avl *)
						&mdata->sensor->fs.fs_avl[0];
	mdata->odr = mdata->sensor->odr.odr_avl[0].hz;

	err = st_sensors_init_sensor(indio_dev, pdata);
	if (err < 0)
		return err;

	err = st_magn_allocate_ring(indio_dev);
	if (err < 0)
		return err;

	if (irq > 0) {
		err = st_sensors_allocate_trigger(indio_dev, NULL);
		if (err < 0)
			goto st_magn_probe_trigger_error;
	}

	err = iio_device_register(indio_dev);
	if (err)
		goto st_magn_device_register_error;

	return 0;

st_magn_device_register_error:
	if (irq > 0)
		st_sensors_deallocate_trigger(indio_dev);
st_magn_probe_trigger_error:
	st_magn_deallocate_ring(indio_dev);

	return err;
}
EXPORT_SYMBOL(st_magn_common_probe);

void st_magn_common_remove(struct iio_dev *indio_dev)
{
	struct st_sensor_data *mdata = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (mdata->get_irq_data_ready(indio_dev) > 0)
		st_sensors_deallocate_trigger(indio_dev);

	st_magn_deallocate_ring(indio_dev);
}
EXPORT_SYMBOL(st_magn_common_remove);

MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud