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Merge tag 'pci-v3.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[deliverable/linux.git] / drivers / iio / adc / max1363.c
1 /*
2 * iio/adc/max1363.c
3 * Copyright (C) 2008-2010 Jonathan Cameron
4 *
5 * based on linux/drivers/i2c/chips/max123x
6 * Copyright (C) 2002-2004 Stefan Eletzhofer
7 *
8 * based on linux/drivers/acron/char/pcf8583.c
9 * Copyright (C) 2000 Russell King
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * max1363.c
16 *
17 * Partial support for max1363 and similar chips.
18 *
19 * Not currently implemented.
20 *
21 * - Control of internal reference.
22 */
23
24 #include <linux/interrupt.h>
25 #include <linux/device.h>
26 #include <linux/kernel.h>
27 #include <linux/sysfs.h>
28 #include <linux/list.h>
29 #include <linux/i2c.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/slab.h>
32 #include <linux/err.h>
33 #include <linux/module.h>
34
35 #include <linux/iio/iio.h>
36 #include <linux/iio/sysfs.h>
37 #include <linux/iio/events.h>
38 #include <linux/iio/buffer.h>
39 #include <linux/iio/driver.h>
40 #include <linux/iio/kfifo_buf.h>
41 #include <linux/iio/trigger_consumer.h>
42 #include <linux/iio/triggered_buffer.h>
43
44 #define MAX1363_SETUP_BYTE(a) ((a) | 0x80)
45
46 /* There is a fair bit more defined here than currently
47 * used, but the intention is to support everything these
48 * chips do in the long run */
49
50 /* see data sheets */
51 /* max1363 and max1236, max1237, max1238, max1239 */
52 #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD 0x00
53 #define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF 0x20
54 #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT 0x40
55 #define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT 0x60
56 #define MAX1363_SETUP_POWER_UP_INT_REF 0x10
57 #define MAX1363_SETUP_POWER_DOWN_INT_REF 0x00
58
59 /* think about including max11600 etc - more settings */
60 #define MAX1363_SETUP_EXT_CLOCK 0x08
61 #define MAX1363_SETUP_INT_CLOCK 0x00
62 #define MAX1363_SETUP_UNIPOLAR 0x00
63 #define MAX1363_SETUP_BIPOLAR 0x04
64 #define MAX1363_SETUP_RESET 0x00
65 #define MAX1363_SETUP_NORESET 0x02
66 /* max1363 only - though don't care on others.
67 * For now monitor modes are not implemented as the relevant
68 * line is not connected on my test board.
69 * The definitions are here as I intend to add this soon.
70 */
71 #define MAX1363_SETUP_MONITOR_SETUP 0x01
72
73 /* Specific to the max1363 */
74 #define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
75 #define MAX1363_MON_INT_ENABLE 0x01
76
77 /* defined for readability reasons */
78 /* All chips */
79 #define MAX1363_CONFIG_BYTE(a) ((a))
80
81 #define MAX1363_CONFIG_SE 0x01
82 #define MAX1363_CONFIG_DE 0x00
83 #define MAX1363_CONFIG_SCAN_TO_CS 0x00
84 #define MAX1363_CONFIG_SCAN_SINGLE_8 0x20
85 #define MAX1363_CONFIG_SCAN_MONITOR_MODE 0x40
86 #define MAX1363_CONFIG_SCAN_SINGLE_1 0x60
87 /* max123{6-9} only */
88 #define MAX1236_SCAN_MID_TO_CHANNEL 0x40
89
90 /* max1363 only - merely part of channel selects or don't care for others */
91 #define MAX1363_CONFIG_EN_MON_MODE_READ 0x18
92
93 #define MAX1363_CHANNEL_SEL(a) ((a) << 1)
94
95 /* max1363 strictly 0x06 - but doesn't matter */
96 #define MAX1363_CHANNEL_SEL_MASK 0x1E
97 #define MAX1363_SCAN_MASK 0x60
98 #define MAX1363_SE_DE_MASK 0x01
99
100 #define MAX1363_MAX_CHANNELS 25
101 /**
102 * struct max1363_mode - scan mode information
103 * @conf: The corresponding value of the configuration register
104 * @modemask: Bit mask corresponding to channels enabled in this mode
105 */
106 struct max1363_mode {
107 int8_t conf;
108 DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
109 };
110
111 /* This must be maintained along side the max1363_mode_table in max1363_core */
112 enum max1363_modes {
113 /* Single read of a single channel */
114 _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
115 /* Differential single read */
116 d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
117 d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
118 /* Scan to channel and mid to channel where overlapping */
119 s0to1, s0to2, s2to3, s0to3, s0to4, s0to5, s0to6,
120 s6to7, s0to7, s6to8, s0to8, s6to9,
121 s0to9, s6to10, s0to10, s6to11, s0to11,
122 /* Differential scan to channel and mid to channel where overlapping */
123 d0m1to2m3, d0m1to4m5, d0m1to6m7, d6m7to8m9,
124 d0m1to8m9, d6m7to10m11, d0m1to10m11, d1m0to3m2,
125 d1m0to5m4, d1m0to7m6, d7m6to9m8, d1m0to9m8,
126 d7m6to11m10, d1m0to11m10,
127 };
128
129 /**
130 * struct max1363_chip_info - chip specifc information
131 * @info: iio core function callbacks structure
132 * @channels: channel specification
133 * @num_channels: number of channels
134 * @mode_list: array of available scan modes
135 * @default_mode: the scan mode in which the chip starts up
136 * @int_vref_mv: the internal reference voltage
137 * @num_modes: number of modes
138 * @bits: accuracy of the adc in bits
139 */
140 struct max1363_chip_info {
141 const struct iio_info *info;
142 const struct iio_chan_spec *channels;
143 int num_channels;
144 const enum max1363_modes *mode_list;
145 enum max1363_modes default_mode;
146 u16 int_vref_mv;
147 u8 num_modes;
148 u8 bits;
149 };
150
151 /**
152 * struct max1363_state - driver instance specific data
153 * @client: i2c_client
154 * @setupbyte: cache of current device setup byte
155 * @configbyte: cache of current device config byte
156 * @chip_info: chip model specific constants, available modes, etc.
157 * @current_mode: the scan mode of this chip
158 * @requestedmask: a valid requested set of channels
159 * @reg: supply regulator
160 * @monitor_on: whether monitor mode is enabled
161 * @monitor_speed: parameter corresponding to device monitor speed setting
162 * @mask_high: bitmask for enabled high thresholds
163 * @mask_low: bitmask for enabled low thresholds
164 * @thresh_high: high threshold values
165 * @thresh_low: low threshold values
166 * @vref: Reference voltage regulator
167 * @vref_uv: Actual (external or internal) reference voltage
168 * @send: function used to send data to the chip
169 * @recv: function used to receive data from the chip
170 */
171 struct max1363_state {
172 struct i2c_client *client;
173 u8 setupbyte;
174 u8 configbyte;
175 const struct max1363_chip_info *chip_info;
176 const struct max1363_mode *current_mode;
177 u32 requestedmask;
178 struct regulator *reg;
179
180 /* Using monitor modes and buffer at the same time is
181 currently not supported */
182 bool monitor_on;
183 unsigned int monitor_speed:3;
184 u8 mask_high;
185 u8 mask_low;
186 /* 4x unipolar first then the fours bipolar ones */
187 s16 thresh_high[8];
188 s16 thresh_low[8];
189 struct regulator *vref;
190 u32 vref_uv;
191 int (*send)(const struct i2c_client *client,
192 const char *buf, int count);
193 int (*recv)(const struct i2c_client *client,
194 char *buf, int count);
195 };
196
197 #define MAX1363_MODE_SINGLE(_num, _mask) { \
198 .conf = MAX1363_CHANNEL_SEL(_num) \
199 | MAX1363_CONFIG_SCAN_SINGLE_1 \
200 | MAX1363_CONFIG_SE, \
201 .modemask[0] = _mask, \
202 }
203
204 #define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) { \
205 .conf = MAX1363_CHANNEL_SEL(_num) \
206 | MAX1363_CONFIG_SCAN_TO_CS \
207 | MAX1363_CONFIG_SE, \
208 .modemask[0] = _mask, \
209 }
210
211 /* note not available for max1363 hence naming */
212 #define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num, _mask) { \
213 .conf = MAX1363_CHANNEL_SEL(_num) \
214 | MAX1236_SCAN_MID_TO_CHANNEL \
215 | MAX1363_CONFIG_SE, \
216 .modemask[0] = _mask \
217 }
218
219 #define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) { \
220 .conf = MAX1363_CHANNEL_SEL(_nump) \
221 | MAX1363_CONFIG_SCAN_SINGLE_1 \
222 | MAX1363_CONFIG_DE, \
223 .modemask[0] = _mask \
224 }
225
226 /* Can't think how to automate naming so specify for now */
227 #define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(_num, _numvals, _mask) { \
228 .conf = MAX1363_CHANNEL_SEL(_num) \
229 | MAX1363_CONFIG_SCAN_TO_CS \
230 | MAX1363_CONFIG_DE, \
231 .modemask[0] = _mask \
232 }
233
234 /* note only available for max1363 hence naming */
235 #define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(_num, _numvals, _mask) { \
236 .conf = MAX1363_CHANNEL_SEL(_num) \
237 | MAX1236_SCAN_MID_TO_CHANNEL \
238 | MAX1363_CONFIG_SE, \
239 .modemask[0] = _mask \
240 }
241
242 static const struct max1363_mode max1363_mode_table[] = {
243 /* All of the single channel options first */
244 MAX1363_MODE_SINGLE(0, 1 << 0),
245 MAX1363_MODE_SINGLE(1, 1 << 1),
246 MAX1363_MODE_SINGLE(2, 1 << 2),
247 MAX1363_MODE_SINGLE(3, 1 << 3),
248 MAX1363_MODE_SINGLE(4, 1 << 4),
249 MAX1363_MODE_SINGLE(5, 1 << 5),
250 MAX1363_MODE_SINGLE(6, 1 << 6),
251 MAX1363_MODE_SINGLE(7, 1 << 7),
252 MAX1363_MODE_SINGLE(8, 1 << 8),
253 MAX1363_MODE_SINGLE(9, 1 << 9),
254 MAX1363_MODE_SINGLE(10, 1 << 10),
255 MAX1363_MODE_SINGLE(11, 1 << 11),
256
257 MAX1363_MODE_DIFF_SINGLE(0, 1, 1 << 12),
258 MAX1363_MODE_DIFF_SINGLE(2, 3, 1 << 13),
259 MAX1363_MODE_DIFF_SINGLE(4, 5, 1 << 14),
260 MAX1363_MODE_DIFF_SINGLE(6, 7, 1 << 15),
261 MAX1363_MODE_DIFF_SINGLE(8, 9, 1 << 16),
262 MAX1363_MODE_DIFF_SINGLE(10, 11, 1 << 17),
263 MAX1363_MODE_DIFF_SINGLE(1, 0, 1 << 18),
264 MAX1363_MODE_DIFF_SINGLE(3, 2, 1 << 19),
265 MAX1363_MODE_DIFF_SINGLE(5, 4, 1 << 20),
266 MAX1363_MODE_DIFF_SINGLE(7, 6, 1 << 21),
267 MAX1363_MODE_DIFF_SINGLE(9, 8, 1 << 22),
268 MAX1363_MODE_DIFF_SINGLE(11, 10, 1 << 23),
269
270 /* The multichannel scans next */
271 MAX1363_MODE_SCAN_TO_CHANNEL(1, 0x003),
272 MAX1363_MODE_SCAN_TO_CHANNEL(2, 0x007),
273 MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3, 0x00C),
274 MAX1363_MODE_SCAN_TO_CHANNEL(3, 0x00F),
275 MAX1363_MODE_SCAN_TO_CHANNEL(4, 0x01F),
276 MAX1363_MODE_SCAN_TO_CHANNEL(5, 0x03F),
277 MAX1363_MODE_SCAN_TO_CHANNEL(6, 0x07F),
278 MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7, 0x0C0),
279 MAX1363_MODE_SCAN_TO_CHANNEL(7, 0x0FF),
280 MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8, 0x1C0),
281 MAX1363_MODE_SCAN_TO_CHANNEL(8, 0x1FF),
282 MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9, 0x3C0),
283 MAX1363_MODE_SCAN_TO_CHANNEL(9, 0x3FF),
284 MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10, 0x7C0),
285 MAX1363_MODE_SCAN_TO_CHANNEL(10, 0x7FF),
286 MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11, 0xFC0),
287 MAX1363_MODE_SCAN_TO_CHANNEL(11, 0xFFF),
288
289 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(2, 2, 0x003000),
290 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(4, 3, 0x007000),
291 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(6, 4, 0x00F000),
292 MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(8, 2, 0x018000),
293 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(8, 5, 0x01F000),
294 MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(10, 3, 0x038000),
295 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(10, 6, 0x3F000),
296 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(3, 2, 0x0C0000),
297 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(5, 3, 0x1C0000),
298 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(7, 4, 0x3C0000),
299 MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(9, 2, 0x600000),
300 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(9, 5, 0x7C0000),
301 MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(11, 3, 0xE00000),
302 MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(11, 6, 0xFC0000),
303 };
304
305 static const struct max1363_mode
306 *max1363_match_mode(const unsigned long *mask,
307 const struct max1363_chip_info *ci)
308 {
309 int i;
310 if (mask)
311 for (i = 0; i < ci->num_modes; i++)
312 if (bitmap_subset(mask,
313 max1363_mode_table[ci->mode_list[i]].
314 modemask,
315 MAX1363_MAX_CHANNELS))
316 return &max1363_mode_table[ci->mode_list[i]];
317 return NULL;
318 }
319
320 static int max1363_smbus_send(const struct i2c_client *client, const char *buf,
321 int count)
322 {
323 int i, err;
324
325 for (i = err = 0; err == 0 && i < count; ++i)
326 err = i2c_smbus_write_byte(client, buf[i]);
327
328 return err ? err : count;
329 }
330
331 static int max1363_smbus_recv(const struct i2c_client *client, char *buf,
332 int count)
333 {
334 int i, ret;
335
336 for (i = 0; i < count; ++i) {
337 ret = i2c_smbus_read_byte(client);
338 if (ret < 0)
339 return ret;
340 buf[i] = ret;
341 }
342
343 return count;
344 }
345
346 static int max1363_write_basic_config(struct max1363_state *st)
347 {
348 u8 tx_buf[2] = { st->setupbyte, st->configbyte };
349
350 return st->send(st->client, tx_buf, 2);
351 }
352
353 static int max1363_set_scan_mode(struct max1363_state *st)
354 {
355 st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
356 | MAX1363_SCAN_MASK
357 | MAX1363_SE_DE_MASK);
358 st->configbyte |= st->current_mode->conf;
359
360 return max1363_write_basic_config(st);
361 }
362
363 static int max1363_read_single_chan(struct iio_dev *indio_dev,
364 struct iio_chan_spec const *chan,
365 int *val,
366 long m)
367 {
368 int ret = 0;
369 s32 data;
370 u8 rxbuf[2];
371 struct max1363_state *st = iio_priv(indio_dev);
372 struct i2c_client *client = st->client;
373
374 mutex_lock(&indio_dev->mlock);
375 /*
376 * If monitor mode is enabled, the method for reading a single
377 * channel will have to be rather different and has not yet
378 * been implemented.
379 *
380 * Also, cannot read directly if buffered capture enabled.
381 */
382 if (st->monitor_on || iio_buffer_enabled(indio_dev)) {
383 ret = -EBUSY;
384 goto error_ret;
385 }
386
387 /* Check to see if current scan mode is correct */
388 if (st->current_mode != &max1363_mode_table[chan->address]) {
389 /* Update scan mode if needed */
390 st->current_mode = &max1363_mode_table[chan->address];
391 ret = max1363_set_scan_mode(st);
392 if (ret < 0)
393 goto error_ret;
394 }
395 if (st->chip_info->bits != 8) {
396 /* Get reading */
397 data = st->recv(client, rxbuf, 2);
398 if (data < 0) {
399 ret = data;
400 goto error_ret;
401 }
402 data = (rxbuf[1] | rxbuf[0] << 8) &
403 ((1 << st->chip_info->bits) - 1);
404 } else {
405 /* Get reading */
406 data = st->recv(client, rxbuf, 1);
407 if (data < 0) {
408 ret = data;
409 goto error_ret;
410 }
411 data = rxbuf[0];
412 }
413 *val = data;
414 error_ret:
415 mutex_unlock(&indio_dev->mlock);
416 return ret;
417
418 }
419
420 static int max1363_read_raw(struct iio_dev *indio_dev,
421 struct iio_chan_spec const *chan,
422 int *val,
423 int *val2,
424 long m)
425 {
426 struct max1363_state *st = iio_priv(indio_dev);
427 int ret;
428
429 switch (m) {
430 case IIO_CHAN_INFO_RAW:
431 ret = max1363_read_single_chan(indio_dev, chan, val, m);
432 if (ret < 0)
433 return ret;
434 return IIO_VAL_INT;
435 case IIO_CHAN_INFO_SCALE:
436 *val = st->vref_uv / 1000;
437 *val2 = st->chip_info->bits;
438 return IIO_VAL_FRACTIONAL_LOG2;
439 default:
440 return -EINVAL;
441 }
442 return 0;
443 }
444
445 /* Applies to max1363 */
446 static const enum max1363_modes max1363_mode_list[] = {
447 _s0, _s1, _s2, _s3,
448 s0to1, s0to2, s0to3,
449 d0m1, d2m3, d1m0, d3m2,
450 d0m1to2m3, d1m0to3m2,
451 };
452
453 static const struct iio_event_spec max1363_events[] = {
454 {
455 .type = IIO_EV_TYPE_THRESH,
456 .dir = IIO_EV_DIR_RISING,
457 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
458 BIT(IIO_EV_INFO_ENABLE),
459 }, {
460 .type = IIO_EV_TYPE_THRESH,
461 .dir = IIO_EV_DIR_FALLING,
462 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
463 BIT(IIO_EV_INFO_ENABLE),
464 },
465 };
466
467 #define MAX1363_CHAN_U(num, addr, si, bits, ev_spec, num_ev_spec) \
468 { \
469 .type = IIO_VOLTAGE, \
470 .indexed = 1, \
471 .channel = num, \
472 .address = addr, \
473 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
474 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
475 .datasheet_name = "AIN"#num, \
476 .scan_type = { \
477 .sign = 'u', \
478 .realbits = bits, \
479 .storagebits = (bits > 8) ? 16 : 8, \
480 .endianness = IIO_BE, \
481 }, \
482 .scan_index = si, \
483 .event_spec = ev_spec, \
484 .num_event_specs = num_ev_spec, \
485 }
486
487 /* bipolar channel */
488 #define MAX1363_CHAN_B(num, num2, addr, si, bits, ev_spec, num_ev_spec) \
489 { \
490 .type = IIO_VOLTAGE, \
491 .differential = 1, \
492 .indexed = 1, \
493 .channel = num, \
494 .channel2 = num2, \
495 .address = addr, \
496 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
497 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
498 .datasheet_name = "AIN"#num"-AIN"#num2, \
499 .scan_type = { \
500 .sign = 's', \
501 .realbits = bits, \
502 .storagebits = (bits > 8) ? 16 : 8, \
503 .endianness = IIO_BE, \
504 }, \
505 .scan_index = si, \
506 .event_spec = ev_spec, \
507 .num_event_specs = num_ev_spec, \
508 }
509
510 #define MAX1363_4X_CHANS(bits, ev_spec, num_ev_spec) { \
511 MAX1363_CHAN_U(0, _s0, 0, bits, ev_spec, num_ev_spec), \
512 MAX1363_CHAN_U(1, _s1, 1, bits, ev_spec, num_ev_spec), \
513 MAX1363_CHAN_U(2, _s2, 2, bits, ev_spec, num_ev_spec), \
514 MAX1363_CHAN_U(3, _s3, 3, bits, ev_spec, num_ev_spec), \
515 MAX1363_CHAN_B(0, 1, d0m1, 4, bits, ev_spec, num_ev_spec), \
516 MAX1363_CHAN_B(2, 3, d2m3, 5, bits, ev_spec, num_ev_spec), \
517 MAX1363_CHAN_B(1, 0, d1m0, 6, bits, ev_spec, num_ev_spec), \
518 MAX1363_CHAN_B(3, 2, d3m2, 7, bits, ev_spec, num_ev_spec), \
519 IIO_CHAN_SOFT_TIMESTAMP(8) \
520 }
521
522 static const struct iio_chan_spec max1036_channels[] =
523 MAX1363_4X_CHANS(8, NULL, 0);
524 static const struct iio_chan_spec max1136_channels[] =
525 MAX1363_4X_CHANS(10, NULL, 0);
526 static const struct iio_chan_spec max1236_channels[] =
527 MAX1363_4X_CHANS(12, NULL, 0);
528 static const struct iio_chan_spec max1361_channels[] =
529 MAX1363_4X_CHANS(10, max1363_events, ARRAY_SIZE(max1363_events));
530 static const struct iio_chan_spec max1363_channels[] =
531 MAX1363_4X_CHANS(12, max1363_events, ARRAY_SIZE(max1363_events));
532
533 /* Applies to max1236, max1237 */
534 static const enum max1363_modes max1236_mode_list[] = {
535 _s0, _s1, _s2, _s3,
536 s0to1, s0to2, s0to3,
537 d0m1, d2m3, d1m0, d3m2,
538 d0m1to2m3, d1m0to3m2,
539 s2to3,
540 };
541
542 /* Applies to max1238, max1239 */
543 static const enum max1363_modes max1238_mode_list[] = {
544 _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
545 s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
546 s0to7, s0to8, s0to9, s0to10, s0to11,
547 d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
548 d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
549 d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
550 d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
551 s6to7, s6to8, s6to9, s6to10, s6to11,
552 d6m7to8m9, d6m7to10m11, d7m6to9m8, d7m6to11m10,
553 };
554
555 #define MAX1363_12X_CHANS(bits) { \
556 MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
557 MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
558 MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
559 MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
560 MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
561 MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
562 MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
563 MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
564 MAX1363_CHAN_U(8, _s8, 8, bits, NULL, 0), \
565 MAX1363_CHAN_U(9, _s9, 9, bits, NULL, 0), \
566 MAX1363_CHAN_U(10, _s10, 10, bits, NULL, 0), \
567 MAX1363_CHAN_U(11, _s11, 11, bits, NULL, 0), \
568 MAX1363_CHAN_B(0, 1, d0m1, 12, bits, NULL, 0), \
569 MAX1363_CHAN_B(2, 3, d2m3, 13, bits, NULL, 0), \
570 MAX1363_CHAN_B(4, 5, d4m5, 14, bits, NULL, 0), \
571 MAX1363_CHAN_B(6, 7, d6m7, 15, bits, NULL, 0), \
572 MAX1363_CHAN_B(8, 9, d8m9, 16, bits, NULL, 0), \
573 MAX1363_CHAN_B(10, 11, d10m11, 17, bits, NULL, 0), \
574 MAX1363_CHAN_B(1, 0, d1m0, 18, bits, NULL, 0), \
575 MAX1363_CHAN_B(3, 2, d3m2, 19, bits, NULL, 0), \
576 MAX1363_CHAN_B(5, 4, d5m4, 20, bits, NULL, 0), \
577 MAX1363_CHAN_B(7, 6, d7m6, 21, bits, NULL, 0), \
578 MAX1363_CHAN_B(9, 8, d9m8, 22, bits, NULL, 0), \
579 MAX1363_CHAN_B(11, 10, d11m10, 23, bits, NULL, 0), \
580 IIO_CHAN_SOFT_TIMESTAMP(24) \
581 }
582 static const struct iio_chan_spec max1038_channels[] = MAX1363_12X_CHANS(8);
583 static const struct iio_chan_spec max1138_channels[] = MAX1363_12X_CHANS(10);
584 static const struct iio_chan_spec max1238_channels[] = MAX1363_12X_CHANS(12);
585
586 static const enum max1363_modes max11607_mode_list[] = {
587 _s0, _s1, _s2, _s3,
588 s0to1, s0to2, s0to3,
589 s2to3,
590 d0m1, d2m3, d1m0, d3m2,
591 d0m1to2m3, d1m0to3m2,
592 };
593
594 static const enum max1363_modes max11608_mode_list[] = {
595 _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7,
596 s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, s0to7,
597 s6to7,
598 d0m1, d2m3, d4m5, d6m7,
599 d1m0, d3m2, d5m4, d7m6,
600 d0m1to2m3, d0m1to4m5, d0m1to6m7,
601 d1m0to3m2, d1m0to5m4, d1m0to7m6,
602 };
603
604 #define MAX1363_8X_CHANS(bits) { \
605 MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
606 MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
607 MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
608 MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
609 MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
610 MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
611 MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
612 MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
613 MAX1363_CHAN_B(0, 1, d0m1, 8, bits, NULL, 0), \
614 MAX1363_CHAN_B(2, 3, d2m3, 9, bits, NULL, 0), \
615 MAX1363_CHAN_B(4, 5, d4m5, 10, bits, NULL, 0), \
616 MAX1363_CHAN_B(6, 7, d6m7, 11, bits, NULL, 0), \
617 MAX1363_CHAN_B(1, 0, d1m0, 12, bits, NULL, 0), \
618 MAX1363_CHAN_B(3, 2, d3m2, 13, bits, NULL, 0), \
619 MAX1363_CHAN_B(5, 4, d5m4, 14, bits, NULL, 0), \
620 MAX1363_CHAN_B(7, 6, d7m6, 15, bits, NULL, 0), \
621 IIO_CHAN_SOFT_TIMESTAMP(16) \
622 }
623 static const struct iio_chan_spec max11602_channels[] = MAX1363_8X_CHANS(8);
624 static const struct iio_chan_spec max11608_channels[] = MAX1363_8X_CHANS(10);
625 static const struct iio_chan_spec max11614_channels[] = MAX1363_8X_CHANS(12);
626
627 static const enum max1363_modes max11644_mode_list[] = {
628 _s0, _s1, s0to1, d0m1, d1m0,
629 };
630
631 #define MAX1363_2X_CHANS(bits) { \
632 MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
633 MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
634 MAX1363_CHAN_B(0, 1, d0m1, 2, bits, NULL, 0), \
635 MAX1363_CHAN_B(1, 0, d1m0, 3, bits, NULL, 0), \
636 IIO_CHAN_SOFT_TIMESTAMP(4) \
637 }
638
639 static const struct iio_chan_spec max11646_channels[] = MAX1363_2X_CHANS(10);
640 static const struct iio_chan_spec max11644_channels[] = MAX1363_2X_CHANS(12);
641
642 enum { max1361,
643 max1362,
644 max1363,
645 max1364,
646 max1036,
647 max1037,
648 max1038,
649 max1039,
650 max1136,
651 max1137,
652 max1138,
653 max1139,
654 max1236,
655 max1237,
656 max1238,
657 max1239,
658 max11600,
659 max11601,
660 max11602,
661 max11603,
662 max11604,
663 max11605,
664 max11606,
665 max11607,
666 max11608,
667 max11609,
668 max11610,
669 max11611,
670 max11612,
671 max11613,
672 max11614,
673 max11615,
674 max11616,
675 max11617,
676 max11644,
677 max11645,
678 max11646,
679 max11647
680 };
681
682 static const int max1363_monitor_speeds[] = { 133000, 665000, 33300, 16600,
683 8300, 4200, 2000, 1000 };
684
685 static ssize_t max1363_monitor_show_freq(struct device *dev,
686 struct device_attribute *attr,
687 char *buf)
688 {
689 struct max1363_state *st = iio_priv(dev_to_iio_dev(dev));
690 return sprintf(buf, "%d\n", max1363_monitor_speeds[st->monitor_speed]);
691 }
692
693 static ssize_t max1363_monitor_store_freq(struct device *dev,
694 struct device_attribute *attr,
695 const char *buf,
696 size_t len)
697 {
698 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
699 struct max1363_state *st = iio_priv(indio_dev);
700 int i, ret;
701 unsigned long val;
702 bool found = false;
703
704 ret = kstrtoul(buf, 10, &val);
705 if (ret)
706 return -EINVAL;
707 for (i = 0; i < ARRAY_SIZE(max1363_monitor_speeds); i++)
708 if (val == max1363_monitor_speeds[i]) {
709 found = true;
710 break;
711 }
712 if (!found)
713 return -EINVAL;
714
715 mutex_lock(&indio_dev->mlock);
716 st->monitor_speed = i;
717 mutex_unlock(&indio_dev->mlock);
718
719 return 0;
720 }
721
722 static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
723 max1363_monitor_show_freq,
724 max1363_monitor_store_freq);
725
726 static IIO_CONST_ATTR(sampling_frequency_available,
727 "133000 665000 33300 16600 8300 4200 2000 1000");
728
729 static int max1363_read_thresh(struct iio_dev *indio_dev,
730 const struct iio_chan_spec *chan, enum iio_event_type type,
731 enum iio_event_direction dir, enum iio_event_info info, int *val,
732 int *val2)
733 {
734 struct max1363_state *st = iio_priv(indio_dev);
735 if (dir == IIO_EV_DIR_FALLING)
736 *val = st->thresh_low[chan->channel];
737 else
738 *val = st->thresh_high[chan->channel];
739 return IIO_VAL_INT;
740 }
741
742 static int max1363_write_thresh(struct iio_dev *indio_dev,
743 const struct iio_chan_spec *chan, enum iio_event_type type,
744 enum iio_event_direction dir, enum iio_event_info info, int val,
745 int val2)
746 {
747 struct max1363_state *st = iio_priv(indio_dev);
748 /* make it handle signed correctly as well */
749 switch (st->chip_info->bits) {
750 case 10:
751 if (val > 0x3FF)
752 return -EINVAL;
753 break;
754 case 12:
755 if (val > 0xFFF)
756 return -EINVAL;
757 break;
758 }
759
760 switch (dir) {
761 case IIO_EV_DIR_FALLING:
762 st->thresh_low[chan->channel] = val;
763 break;
764 case IIO_EV_DIR_RISING:
765 st->thresh_high[chan->channel] = val;
766 break;
767 default:
768 return -EINVAL;
769 }
770
771 return 0;
772 }
773
774 static const u64 max1363_event_codes[] = {
775 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
776 IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
777 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
778 IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
779 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
780 IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
781 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
782 IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
783 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
784 IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
785 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
786 IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
787 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
788 IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
789 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
790 IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
791 };
792
793 static irqreturn_t max1363_event_handler(int irq, void *private)
794 {
795 struct iio_dev *indio_dev = private;
796 struct max1363_state *st = iio_priv(indio_dev);
797 s64 timestamp = iio_get_time_ns();
798 unsigned long mask, loc;
799 u8 rx;
800 u8 tx[2] = { st->setupbyte,
801 MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };
802
803 st->recv(st->client, &rx, 1);
804 mask = rx;
805 for_each_set_bit(loc, &mask, 8)
806 iio_push_event(indio_dev, max1363_event_codes[loc], timestamp);
807 st->send(st->client, tx, 2);
808
809 return IRQ_HANDLED;
810 }
811
812 static int max1363_read_event_config(struct iio_dev *indio_dev,
813 const struct iio_chan_spec *chan, enum iio_event_type type,
814 enum iio_event_direction dir)
815 {
816 struct max1363_state *st = iio_priv(indio_dev);
817 int val;
818 int number = chan->channel;
819
820 mutex_lock(&indio_dev->mlock);
821 if (dir == IIO_EV_DIR_FALLING)
822 val = (1 << number) & st->mask_low;
823 else
824 val = (1 << number) & st->mask_high;
825 mutex_unlock(&indio_dev->mlock);
826
827 return val;
828 }
829
830 static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
831 {
832 u8 *tx_buf;
833 int ret, i = 3, j;
834 unsigned long numelements;
835 int len;
836 const long *modemask;
837
838 if (!enabled) {
839 /* transition to buffered capture is not currently supported */
840 st->setupbyte &= ~MAX1363_SETUP_MONITOR_SETUP;
841 st->configbyte &= ~MAX1363_SCAN_MASK;
842 st->monitor_on = false;
843 return max1363_write_basic_config(st);
844 }
845
846 /* Ensure we are in the relevant mode */
847 st->setupbyte |= MAX1363_SETUP_MONITOR_SETUP;
848 st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
849 | MAX1363_SCAN_MASK
850 | MAX1363_SE_DE_MASK);
851 st->configbyte |= MAX1363_CONFIG_SCAN_MONITOR_MODE;
852 if ((st->mask_low | st->mask_high) & 0x0F) {
853 st->configbyte |= max1363_mode_table[s0to3].conf;
854 modemask = max1363_mode_table[s0to3].modemask;
855 } else if ((st->mask_low | st->mask_high) & 0x30) {
856 st->configbyte |= max1363_mode_table[d0m1to2m3].conf;
857 modemask = max1363_mode_table[d0m1to2m3].modemask;
858 } else {
859 st->configbyte |= max1363_mode_table[d1m0to3m2].conf;
860 modemask = max1363_mode_table[d1m0to3m2].modemask;
861 }
862 numelements = bitmap_weight(modemask, MAX1363_MAX_CHANNELS);
863 len = 3 * numelements + 3;
864 tx_buf = kmalloc(len, GFP_KERNEL);
865 if (!tx_buf) {
866 ret = -ENOMEM;
867 goto error_ret;
868 }
869 tx_buf[0] = st->configbyte;
870 tx_buf[1] = st->setupbyte;
871 tx_buf[2] = (st->monitor_speed << 1);
872
873 /*
874 * So we need to do yet another bit of nefarious scan mode
875 * setup to match what we need.
876 */
877 for (j = 0; j < 8; j++)
878 if (test_bit(j, modemask)) {
879 /* Establish the mode is in the scan */
880 if (st->mask_low & (1 << j)) {
881 tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;
882 tx_buf[i + 1] = (st->thresh_low[j] << 4) & 0xF0;
883 } else if (j < 4) {
884 tx_buf[i] = 0;
885 tx_buf[i + 1] = 0;
886 } else {
887 tx_buf[i] = 0x80;
888 tx_buf[i + 1] = 0;
889 }
890 if (st->mask_high & (1 << j)) {
891 tx_buf[i + 1] |=
892 (st->thresh_high[j] >> 8) & 0x0F;
893 tx_buf[i + 2] = st->thresh_high[j] & 0xFF;
894 } else if (j < 4) {
895 tx_buf[i + 1] |= 0x0F;
896 tx_buf[i + 2] = 0xFF;
897 } else {
898 tx_buf[i + 1] |= 0x07;
899 tx_buf[i + 2] = 0xFF;
900 }
901 i += 3;
902 }
903
904
905 ret = st->send(st->client, tx_buf, len);
906 if (ret < 0)
907 goto error_ret;
908 if (ret != len) {
909 ret = -EIO;
910 goto error_ret;
911 }
912
913 /*
914 * Now that we hopefully have sensible thresholds in place it is
915 * time to turn the interrupts on.
916 * It is unclear from the data sheet if this should be necessary
917 * (i.e. whether monitor mode setup is atomic) but it appears to
918 * be in practice.
919 */
920 tx_buf[0] = st->setupbyte;
921 tx_buf[1] = MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0;
922 ret = st->send(st->client, tx_buf, 2);
923 if (ret < 0)
924 goto error_ret;
925 if (ret != 2) {
926 ret = -EIO;
927 goto error_ret;
928 }
929 ret = 0;
930 st->monitor_on = true;
931 error_ret:
932
933 kfree(tx_buf);
934
935 return ret;
936 }
937
938 /*
939 * To keep this manageable we always use one of 3 scan modes.
940 * Scan 0...3, 0-1,2-3 and 1-0,3-2
941 */
942
943 static inline int __max1363_check_event_mask(int thismask, int checkmask)
944 {
945 int ret = 0;
946 /* Is it unipolar */
947 if (thismask < 4) {
948 if (checkmask & ~0x0F) {
949 ret = -EBUSY;
950 goto error_ret;
951 }
952 } else if (thismask < 6) {
953 if (checkmask & ~0x30) {
954 ret = -EBUSY;
955 goto error_ret;
956 }
957 } else if (checkmask & ~0xC0)
958 ret = -EBUSY;
959 error_ret:
960 return ret;
961 }
962
963 static int max1363_write_event_config(struct iio_dev *indio_dev,
964 const struct iio_chan_spec *chan, enum iio_event_type type,
965 enum iio_event_direction dir, int state)
966 {
967 int ret = 0;
968 struct max1363_state *st = iio_priv(indio_dev);
969 u16 unifiedmask;
970 int number = chan->channel;
971
972 mutex_lock(&indio_dev->mlock);
973 unifiedmask = st->mask_low | st->mask_high;
974 if (dir == IIO_EV_DIR_FALLING) {
975
976 if (state == 0)
977 st->mask_low &= ~(1 << number);
978 else {
979 ret = __max1363_check_event_mask((1 << number),
980 unifiedmask);
981 if (ret)
982 goto error_ret;
983 st->mask_low |= (1 << number);
984 }
985 } else {
986 if (state == 0)
987 st->mask_high &= ~(1 << number);
988 else {
989 ret = __max1363_check_event_mask((1 << number),
990 unifiedmask);
991 if (ret)
992 goto error_ret;
993 st->mask_high |= (1 << number);
994 }
995 }
996
997 max1363_monitor_mode_update(st, !!(st->mask_high | st->mask_low));
998 error_ret:
999 mutex_unlock(&indio_dev->mlock);
1000
1001 return ret;
1002 }
1003
1004 /*
1005 * As with scan_elements, only certain sets of these can
1006 * be combined.
1007 */
1008 static struct attribute *max1363_event_attributes[] = {
1009 &iio_dev_attr_sampling_frequency.dev_attr.attr,
1010 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
1011 NULL,
1012 };
1013
1014 static struct attribute_group max1363_event_attribute_group = {
1015 .attrs = max1363_event_attributes,
1016 .name = "events",
1017 };
1018
1019 static int max1363_update_scan_mode(struct iio_dev *indio_dev,
1020 const unsigned long *scan_mask)
1021 {
1022 struct max1363_state *st = iio_priv(indio_dev);
1023
1024 /*
1025 * Need to figure out the current mode based upon the requested
1026 * scan mask in iio_dev
1027 */
1028 st->current_mode = max1363_match_mode(scan_mask, st->chip_info);
1029 if (!st->current_mode)
1030 return -EINVAL;
1031 max1363_set_scan_mode(st);
1032 return 0;
1033 }
1034
1035 static const struct iio_info max1238_info = {
1036 .read_raw = &max1363_read_raw,
1037 .driver_module = THIS_MODULE,
1038 .update_scan_mode = &max1363_update_scan_mode,
1039 };
1040
1041 static const struct iio_info max1363_info = {
1042 .read_event_value = &max1363_read_thresh,
1043 .write_event_value = &max1363_write_thresh,
1044 .read_event_config = &max1363_read_event_config,
1045 .write_event_config = &max1363_write_event_config,
1046 .read_raw = &max1363_read_raw,
1047 .update_scan_mode = &max1363_update_scan_mode,
1048 .driver_module = THIS_MODULE,
1049 .event_attrs = &max1363_event_attribute_group,
1050 };
1051
1052 /* max1363 and max1368 tested - rest from data sheet */
1053 static const struct max1363_chip_info max1363_chip_info_tbl[] = {
1054 [max1361] = {
1055 .bits = 10,
1056 .int_vref_mv = 2048,
1057 .mode_list = max1363_mode_list,
1058 .num_modes = ARRAY_SIZE(max1363_mode_list),
1059 .default_mode = s0to3,
1060 .channels = max1361_channels,
1061 .num_channels = ARRAY_SIZE(max1361_channels),
1062 .info = &max1363_info,
1063 },
1064 [max1362] = {
1065 .bits = 10,
1066 .int_vref_mv = 4096,
1067 .mode_list = max1363_mode_list,
1068 .num_modes = ARRAY_SIZE(max1363_mode_list),
1069 .default_mode = s0to3,
1070 .channels = max1361_channels,
1071 .num_channels = ARRAY_SIZE(max1361_channels),
1072 .info = &max1363_info,
1073 },
1074 [max1363] = {
1075 .bits = 12,
1076 .int_vref_mv = 2048,
1077 .mode_list = max1363_mode_list,
1078 .num_modes = ARRAY_SIZE(max1363_mode_list),
1079 .default_mode = s0to3,
1080 .channels = max1363_channels,
1081 .num_channels = ARRAY_SIZE(max1363_channels),
1082 .info = &max1363_info,
1083 },
1084 [max1364] = {
1085 .bits = 12,
1086 .int_vref_mv = 4096,
1087 .mode_list = max1363_mode_list,
1088 .num_modes = ARRAY_SIZE(max1363_mode_list),
1089 .default_mode = s0to3,
1090 .channels = max1363_channels,
1091 .num_channels = ARRAY_SIZE(max1363_channels),
1092 .info = &max1363_info,
1093 },
1094 [max1036] = {
1095 .bits = 8,
1096 .int_vref_mv = 4096,
1097 .mode_list = max1236_mode_list,
1098 .num_modes = ARRAY_SIZE(max1236_mode_list),
1099 .default_mode = s0to3,
1100 .info = &max1238_info,
1101 .channels = max1036_channels,
1102 .num_channels = ARRAY_SIZE(max1036_channels),
1103 },
1104 [max1037] = {
1105 .bits = 8,
1106 .int_vref_mv = 2048,
1107 .mode_list = max1236_mode_list,
1108 .num_modes = ARRAY_SIZE(max1236_mode_list),
1109 .default_mode = s0to3,
1110 .info = &max1238_info,
1111 .channels = max1036_channels,
1112 .num_channels = ARRAY_SIZE(max1036_channels),
1113 },
1114 [max1038] = {
1115 .bits = 8,
1116 .int_vref_mv = 4096,
1117 .mode_list = max1238_mode_list,
1118 .num_modes = ARRAY_SIZE(max1238_mode_list),
1119 .default_mode = s0to11,
1120 .info = &max1238_info,
1121 .channels = max1038_channels,
1122 .num_channels = ARRAY_SIZE(max1038_channels),
1123 },
1124 [max1039] = {
1125 .bits = 8,
1126 .int_vref_mv = 2048,
1127 .mode_list = max1238_mode_list,
1128 .num_modes = ARRAY_SIZE(max1238_mode_list),
1129 .default_mode = s0to11,
1130 .info = &max1238_info,
1131 .channels = max1038_channels,
1132 .num_channels = ARRAY_SIZE(max1038_channels),
1133 },
1134 [max1136] = {
1135 .bits = 10,
1136 .int_vref_mv = 4096,
1137 .mode_list = max1236_mode_list,
1138 .num_modes = ARRAY_SIZE(max1236_mode_list),
1139 .default_mode = s0to3,
1140 .info = &max1238_info,
1141 .channels = max1136_channels,
1142 .num_channels = ARRAY_SIZE(max1136_channels),
1143 },
1144 [max1137] = {
1145 .bits = 10,
1146 .int_vref_mv = 2048,
1147 .mode_list = max1236_mode_list,
1148 .num_modes = ARRAY_SIZE(max1236_mode_list),
1149 .default_mode = s0to3,
1150 .info = &max1238_info,
1151 .channels = max1136_channels,
1152 .num_channels = ARRAY_SIZE(max1136_channels),
1153 },
1154 [max1138] = {
1155 .bits = 10,
1156 .int_vref_mv = 4096,
1157 .mode_list = max1238_mode_list,
1158 .num_modes = ARRAY_SIZE(max1238_mode_list),
1159 .default_mode = s0to11,
1160 .info = &max1238_info,
1161 .channels = max1138_channels,
1162 .num_channels = ARRAY_SIZE(max1138_channels),
1163 },
1164 [max1139] = {
1165 .bits = 10,
1166 .int_vref_mv = 2048,
1167 .mode_list = max1238_mode_list,
1168 .num_modes = ARRAY_SIZE(max1238_mode_list),
1169 .default_mode = s0to11,
1170 .info = &max1238_info,
1171 .channels = max1138_channels,
1172 .num_channels = ARRAY_SIZE(max1138_channels),
1173 },
1174 [max1236] = {
1175 .bits = 12,
1176 .int_vref_mv = 4096,
1177 .mode_list = max1236_mode_list,
1178 .num_modes = ARRAY_SIZE(max1236_mode_list),
1179 .default_mode = s0to3,
1180 .info = &max1238_info,
1181 .channels = max1236_channels,
1182 .num_channels = ARRAY_SIZE(max1236_channels),
1183 },
1184 [max1237] = {
1185 .bits = 12,
1186 .int_vref_mv = 2048,
1187 .mode_list = max1236_mode_list,
1188 .num_modes = ARRAY_SIZE(max1236_mode_list),
1189 .default_mode = s0to3,
1190 .info = &max1238_info,
1191 .channels = max1236_channels,
1192 .num_channels = ARRAY_SIZE(max1236_channels),
1193 },
1194 [max1238] = {
1195 .bits = 12,
1196 .int_vref_mv = 4096,
1197 .mode_list = max1238_mode_list,
1198 .num_modes = ARRAY_SIZE(max1238_mode_list),
1199 .default_mode = s0to11,
1200 .info = &max1238_info,
1201 .channels = max1238_channels,
1202 .num_channels = ARRAY_SIZE(max1238_channels),
1203 },
1204 [max1239] = {
1205 .bits = 12,
1206 .int_vref_mv = 2048,
1207 .mode_list = max1238_mode_list,
1208 .num_modes = ARRAY_SIZE(max1238_mode_list),
1209 .default_mode = s0to11,
1210 .info = &max1238_info,
1211 .channels = max1238_channels,
1212 .num_channels = ARRAY_SIZE(max1238_channels),
1213 },
1214 [max11600] = {
1215 .bits = 8,
1216 .int_vref_mv = 4096,
1217 .mode_list = max11607_mode_list,
1218 .num_modes = ARRAY_SIZE(max11607_mode_list),
1219 .default_mode = s0to3,
1220 .info = &max1238_info,
1221 .channels = max1036_channels,
1222 .num_channels = ARRAY_SIZE(max1036_channels),
1223 },
1224 [max11601] = {
1225 .bits = 8,
1226 .int_vref_mv = 2048,
1227 .mode_list = max11607_mode_list,
1228 .num_modes = ARRAY_SIZE(max11607_mode_list),
1229 .default_mode = s0to3,
1230 .info = &max1238_info,
1231 .channels = max1036_channels,
1232 .num_channels = ARRAY_SIZE(max1036_channels),
1233 },
1234 [max11602] = {
1235 .bits = 8,
1236 .int_vref_mv = 4096,
1237 .mode_list = max11608_mode_list,
1238 .num_modes = ARRAY_SIZE(max11608_mode_list),
1239 .default_mode = s0to7,
1240 .info = &max1238_info,
1241 .channels = max11602_channels,
1242 .num_channels = ARRAY_SIZE(max11602_channels),
1243 },
1244 [max11603] = {
1245 .bits = 8,
1246 .int_vref_mv = 2048,
1247 .mode_list = max11608_mode_list,
1248 .num_modes = ARRAY_SIZE(max11608_mode_list),
1249 .default_mode = s0to7,
1250 .info = &max1238_info,
1251 .channels = max11602_channels,
1252 .num_channels = ARRAY_SIZE(max11602_channels),
1253 },
1254 [max11604] = {
1255 .bits = 8,
1256 .int_vref_mv = 4098,
1257 .mode_list = max1238_mode_list,
1258 .num_modes = ARRAY_SIZE(max1238_mode_list),
1259 .default_mode = s0to11,
1260 .info = &max1238_info,
1261 .channels = max1238_channels,
1262 .num_channels = ARRAY_SIZE(max1238_channels),
1263 },
1264 [max11605] = {
1265 .bits = 8,
1266 .int_vref_mv = 2048,
1267 .mode_list = max1238_mode_list,
1268 .num_modes = ARRAY_SIZE(max1238_mode_list),
1269 .default_mode = s0to11,
1270 .info = &max1238_info,
1271 .channels = max1238_channels,
1272 .num_channels = ARRAY_SIZE(max1238_channels),
1273 },
1274 [max11606] = {
1275 .bits = 10,
1276 .int_vref_mv = 4096,
1277 .mode_list = max11607_mode_list,
1278 .num_modes = ARRAY_SIZE(max11607_mode_list),
1279 .default_mode = s0to3,
1280 .info = &max1238_info,
1281 .channels = max1136_channels,
1282 .num_channels = ARRAY_SIZE(max1136_channels),
1283 },
1284 [max11607] = {
1285 .bits = 10,
1286 .int_vref_mv = 2048,
1287 .mode_list = max11607_mode_list,
1288 .num_modes = ARRAY_SIZE(max11607_mode_list),
1289 .default_mode = s0to3,
1290 .info = &max1238_info,
1291 .channels = max1136_channels,
1292 .num_channels = ARRAY_SIZE(max1136_channels),
1293 },
1294 [max11608] = {
1295 .bits = 10,
1296 .int_vref_mv = 4096,
1297 .mode_list = max11608_mode_list,
1298 .num_modes = ARRAY_SIZE(max11608_mode_list),
1299 .default_mode = s0to7,
1300 .info = &max1238_info,
1301 .channels = max11608_channels,
1302 .num_channels = ARRAY_SIZE(max11608_channels),
1303 },
1304 [max11609] = {
1305 .bits = 10,
1306 .int_vref_mv = 2048,
1307 .mode_list = max11608_mode_list,
1308 .num_modes = ARRAY_SIZE(max11608_mode_list),
1309 .default_mode = s0to7,
1310 .info = &max1238_info,
1311 .channels = max11608_channels,
1312 .num_channels = ARRAY_SIZE(max11608_channels),
1313 },
1314 [max11610] = {
1315 .bits = 10,
1316 .int_vref_mv = 4098,
1317 .mode_list = max1238_mode_list,
1318 .num_modes = ARRAY_SIZE(max1238_mode_list),
1319 .default_mode = s0to11,
1320 .info = &max1238_info,
1321 .channels = max1238_channels,
1322 .num_channels = ARRAY_SIZE(max1238_channels),
1323 },
1324 [max11611] = {
1325 .bits = 10,
1326 .int_vref_mv = 2048,
1327 .mode_list = max1238_mode_list,
1328 .num_modes = ARRAY_SIZE(max1238_mode_list),
1329 .default_mode = s0to11,
1330 .info = &max1238_info,
1331 .channels = max1238_channels,
1332 .num_channels = ARRAY_SIZE(max1238_channels),
1333 },
1334 [max11612] = {
1335 .bits = 12,
1336 .int_vref_mv = 4096,
1337 .mode_list = max11607_mode_list,
1338 .num_modes = ARRAY_SIZE(max11607_mode_list),
1339 .default_mode = s0to3,
1340 .info = &max1238_info,
1341 .channels = max1363_channels,
1342 .num_channels = ARRAY_SIZE(max1363_channels),
1343 },
1344 [max11613] = {
1345 .bits = 12,
1346 .int_vref_mv = 2048,
1347 .mode_list = max11607_mode_list,
1348 .num_modes = ARRAY_SIZE(max11607_mode_list),
1349 .default_mode = s0to3,
1350 .info = &max1238_info,
1351 .channels = max1363_channels,
1352 .num_channels = ARRAY_SIZE(max1363_channels),
1353 },
1354 [max11614] = {
1355 .bits = 12,
1356 .int_vref_mv = 4096,
1357 .mode_list = max11608_mode_list,
1358 .num_modes = ARRAY_SIZE(max11608_mode_list),
1359 .default_mode = s0to7,
1360 .info = &max1238_info,
1361 .channels = max11614_channels,
1362 .num_channels = ARRAY_SIZE(max11614_channels),
1363 },
1364 [max11615] = {
1365 .bits = 12,
1366 .int_vref_mv = 2048,
1367 .mode_list = max11608_mode_list,
1368 .num_modes = ARRAY_SIZE(max11608_mode_list),
1369 .default_mode = s0to7,
1370 .info = &max1238_info,
1371 .channels = max11614_channels,
1372 .num_channels = ARRAY_SIZE(max11614_channels),
1373 },
1374 [max11616] = {
1375 .bits = 12,
1376 .int_vref_mv = 4098,
1377 .mode_list = max1238_mode_list,
1378 .num_modes = ARRAY_SIZE(max1238_mode_list),
1379 .default_mode = s0to11,
1380 .info = &max1238_info,
1381 .channels = max1238_channels,
1382 .num_channels = ARRAY_SIZE(max1238_channels),
1383 },
1384 [max11617] = {
1385 .bits = 12,
1386 .int_vref_mv = 2048,
1387 .mode_list = max1238_mode_list,
1388 .num_modes = ARRAY_SIZE(max1238_mode_list),
1389 .default_mode = s0to11,
1390 .info = &max1238_info,
1391 .channels = max1238_channels,
1392 .num_channels = ARRAY_SIZE(max1238_channels),
1393 },
1394 [max11644] = {
1395 .bits = 12,
1396 .int_vref_mv = 2048,
1397 .mode_list = max11644_mode_list,
1398 .num_modes = ARRAY_SIZE(max11644_mode_list),
1399 .default_mode = s0to1,
1400 .info = &max1238_info,
1401 .channels = max11644_channels,
1402 .num_channels = ARRAY_SIZE(max11644_channels),
1403 },
1404 [max11645] = {
1405 .bits = 12,
1406 .int_vref_mv = 4096,
1407 .mode_list = max11644_mode_list,
1408 .num_modes = ARRAY_SIZE(max11644_mode_list),
1409 .default_mode = s0to1,
1410 .info = &max1238_info,
1411 .channels = max11644_channels,
1412 .num_channels = ARRAY_SIZE(max11644_channels),
1413 },
1414 [max11646] = {
1415 .bits = 10,
1416 .int_vref_mv = 2048,
1417 .mode_list = max11644_mode_list,
1418 .num_modes = ARRAY_SIZE(max11644_mode_list),
1419 .default_mode = s0to1,
1420 .info = &max1238_info,
1421 .channels = max11646_channels,
1422 .num_channels = ARRAY_SIZE(max11646_channels),
1423 },
1424 [max11647] = {
1425 .bits = 10,
1426 .int_vref_mv = 4096,
1427 .mode_list = max11644_mode_list,
1428 .num_modes = ARRAY_SIZE(max11644_mode_list),
1429 .default_mode = s0to1,
1430 .info = &max1238_info,
1431 .channels = max11646_channels,
1432 .num_channels = ARRAY_SIZE(max11646_channels),
1433 },
1434 };
1435
1436 static int max1363_initial_setup(struct max1363_state *st)
1437 {
1438 st->setupbyte = MAX1363_SETUP_INT_CLOCK
1439 | MAX1363_SETUP_UNIPOLAR
1440 | MAX1363_SETUP_NORESET;
1441
1442 if (st->vref)
1443 st->setupbyte |= MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF;
1444 else
1445 st->setupbyte |= MAX1363_SETUP_POWER_UP_INT_REF
1446 | MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT;
1447
1448 /* Set scan mode writes the config anyway so wait until then */
1449 st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte);
1450 st->current_mode = &max1363_mode_table[st->chip_info->default_mode];
1451 st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte);
1452
1453 return max1363_set_scan_mode(st);
1454 }
1455
1456 static int max1363_alloc_scan_masks(struct iio_dev *indio_dev)
1457 {
1458 struct max1363_state *st = iio_priv(indio_dev);
1459 unsigned long *masks;
1460 int i;
1461
1462 masks = devm_kzalloc(&indio_dev->dev,
1463 BITS_TO_LONGS(MAX1363_MAX_CHANNELS) * sizeof(long) *
1464 (st->chip_info->num_modes + 1), GFP_KERNEL);
1465 if (!masks)
1466 return -ENOMEM;
1467
1468 for (i = 0; i < st->chip_info->num_modes; i++)
1469 bitmap_copy(masks + BITS_TO_LONGS(MAX1363_MAX_CHANNELS)*i,
1470 max1363_mode_table[st->chip_info->mode_list[i]]
1471 .modemask, MAX1363_MAX_CHANNELS);
1472
1473 indio_dev->available_scan_masks = masks;
1474
1475 return 0;
1476 }
1477
1478 static irqreturn_t max1363_trigger_handler(int irq, void *p)
1479 {
1480 struct iio_poll_func *pf = p;
1481 struct iio_dev *indio_dev = pf->indio_dev;
1482 struct max1363_state *st = iio_priv(indio_dev);
1483 __u8 *rxbuf;
1484 int b_sent;
1485 size_t d_size;
1486 unsigned long numvals = bitmap_weight(st->current_mode->modemask,
1487 MAX1363_MAX_CHANNELS);
1488
1489 /* Ensure the timestamp is 8 byte aligned */
1490 if (st->chip_info->bits != 8)
1491 d_size = numvals*2;
1492 else
1493 d_size = numvals;
1494 if (indio_dev->scan_timestamp) {
1495 d_size += sizeof(s64);
1496 if (d_size % sizeof(s64))
1497 d_size += sizeof(s64) - (d_size % sizeof(s64));
1498 }
1499 /* Monitor mode prevents reading. Whilst not currently implemented
1500 * might as well have this test in here in the meantime as it does
1501 * no harm.
1502 */
1503 if (numvals == 0)
1504 goto done;
1505
1506 rxbuf = kmalloc(d_size, GFP_KERNEL);
1507 if (rxbuf == NULL)
1508 goto done;
1509 if (st->chip_info->bits != 8)
1510 b_sent = st->recv(st->client, rxbuf, numvals * 2);
1511 else
1512 b_sent = st->recv(st->client, rxbuf, numvals);
1513 if (b_sent < 0)
1514 goto done_free;
1515
1516 iio_push_to_buffers_with_timestamp(indio_dev, rxbuf, iio_get_time_ns());
1517
1518 done_free:
1519 kfree(rxbuf);
1520 done:
1521 iio_trigger_notify_done(indio_dev->trig);
1522
1523 return IRQ_HANDLED;
1524 }
1525
1526 static int max1363_probe(struct i2c_client *client,
1527 const struct i2c_device_id *id)
1528 {
1529 int ret;
1530 struct max1363_state *st;
1531 struct iio_dev *indio_dev;
1532 struct regulator *vref;
1533
1534 indio_dev = devm_iio_device_alloc(&client->dev,
1535 sizeof(struct max1363_state));
1536 if (!indio_dev)
1537 return -ENOMEM;
1538
1539 indio_dev->dev.of_node = client->dev.of_node;
1540 ret = iio_map_array_register(indio_dev, client->dev.platform_data);
1541 if (ret < 0)
1542 return ret;
1543
1544 st = iio_priv(indio_dev);
1545
1546 st->reg = devm_regulator_get(&client->dev, "vcc");
1547 if (IS_ERR(st->reg)) {
1548 ret = PTR_ERR(st->reg);
1549 goto error_unregister_map;
1550 }
1551
1552 ret = regulator_enable(st->reg);
1553 if (ret)
1554 goto error_unregister_map;
1555
1556 /* this is only used for device removal purposes */
1557 i2c_set_clientdata(client, indio_dev);
1558
1559 st->chip_info = &max1363_chip_info_tbl[id->driver_data];
1560 st->client = client;
1561
1562 st->vref_uv = st->chip_info->int_vref_mv * 1000;
1563 vref = devm_regulator_get_optional(&client->dev, "vref");
1564 if (!IS_ERR(vref)) {
1565 int vref_uv;
1566
1567 ret = regulator_enable(vref);
1568 if (ret)
1569 goto error_disable_reg;
1570 st->vref = vref;
1571 vref_uv = regulator_get_voltage(vref);
1572 if (vref_uv <= 0) {
1573 ret = -EINVAL;
1574 goto error_disable_reg;
1575 }
1576 st->vref_uv = vref_uv;
1577 }
1578
1579 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1580 st->send = i2c_master_send;
1581 st->recv = i2c_master_recv;
1582 } else if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)
1583 && st->chip_info->bits == 8) {
1584 st->send = max1363_smbus_send;
1585 st->recv = max1363_smbus_recv;
1586 } else {
1587 ret = -EOPNOTSUPP;
1588 goto error_disable_reg;
1589 }
1590
1591 ret = max1363_alloc_scan_masks(indio_dev);
1592 if (ret)
1593 goto error_disable_reg;
1594
1595 /* Establish that the iio_dev is a child of the i2c device */
1596 indio_dev->dev.parent = &client->dev;
1597 indio_dev->name = id->name;
1598 indio_dev->channels = st->chip_info->channels;
1599 indio_dev->num_channels = st->chip_info->num_channels;
1600 indio_dev->info = st->chip_info->info;
1601 indio_dev->modes = INDIO_DIRECT_MODE;
1602 ret = max1363_initial_setup(st);
1603 if (ret < 0)
1604 goto error_disable_reg;
1605
1606 ret = iio_triggered_buffer_setup(indio_dev, NULL,
1607 &max1363_trigger_handler, NULL);
1608 if (ret)
1609 goto error_disable_reg;
1610
1611 if (client->irq) {
1612 ret = devm_request_threaded_irq(&client->dev, st->client->irq,
1613 NULL,
1614 &max1363_event_handler,
1615 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1616 "max1363_event",
1617 indio_dev);
1618
1619 if (ret)
1620 goto error_uninit_buffer;
1621 }
1622
1623 ret = iio_device_register(indio_dev);
1624 if (ret < 0)
1625 goto error_uninit_buffer;
1626
1627 return 0;
1628
1629 error_uninit_buffer:
1630 iio_triggered_buffer_cleanup(indio_dev);
1631 error_disable_reg:
1632 if (st->vref)
1633 regulator_disable(st->vref);
1634 regulator_disable(st->reg);
1635 error_unregister_map:
1636 iio_map_array_unregister(indio_dev);
1637 return ret;
1638 }
1639
1640 static int max1363_remove(struct i2c_client *client)
1641 {
1642 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1643 struct max1363_state *st = iio_priv(indio_dev);
1644
1645 iio_device_unregister(indio_dev);
1646 iio_triggered_buffer_cleanup(indio_dev);
1647 if (st->vref)
1648 regulator_disable(st->vref);
1649 regulator_disable(st->reg);
1650 iio_map_array_unregister(indio_dev);
1651
1652 return 0;
1653 }
1654
1655 static const struct i2c_device_id max1363_id[] = {
1656 { "max1361", max1361 },
1657 { "max1362", max1362 },
1658 { "max1363", max1363 },
1659 { "max1364", max1364 },
1660 { "max1036", max1036 },
1661 { "max1037", max1037 },
1662 { "max1038", max1038 },
1663 { "max1039", max1039 },
1664 { "max1136", max1136 },
1665 { "max1137", max1137 },
1666 { "max1138", max1138 },
1667 { "max1139", max1139 },
1668 { "max1236", max1236 },
1669 { "max1237", max1237 },
1670 { "max1238", max1238 },
1671 { "max1239", max1239 },
1672 { "max11600", max11600 },
1673 { "max11601", max11601 },
1674 { "max11602", max11602 },
1675 { "max11603", max11603 },
1676 { "max11604", max11604 },
1677 { "max11605", max11605 },
1678 { "max11606", max11606 },
1679 { "max11607", max11607 },
1680 { "max11608", max11608 },
1681 { "max11609", max11609 },
1682 { "max11610", max11610 },
1683 { "max11611", max11611 },
1684 { "max11612", max11612 },
1685 { "max11613", max11613 },
1686 { "max11614", max11614 },
1687 { "max11615", max11615 },
1688 { "max11616", max11616 },
1689 { "max11617", max11617 },
1690 {}
1691 };
1692
1693 MODULE_DEVICE_TABLE(i2c, max1363_id);
1694
1695 static struct i2c_driver max1363_driver = {
1696 .driver = {
1697 .name = "max1363",
1698 },
1699 .probe = max1363_probe,
1700 .remove = max1363_remove,
1701 .id_table = max1363_id,
1702 };
1703 module_i2c_driver(max1363_driver);
1704
1705 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1706 MODULE_DESCRIPTION("Maxim 1363 ADC");
1707 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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