1 // SPDX-License-Identifier: GPL-2.0-only
2  /*
3   * iio/adc/max1363.c
4   * Copyright (C) 2008-2010 Jonathan Cameron
5   *
6   * based on linux/drivers/i2c/chips/max123x
7   * Copyright (C) 2002-2004 Stefan Eletzhofer
8   *
9   * based on linux/drivers/acron/char/pcf8583.c
10   * Copyright (C) 2000 Russell King
11   *
12   * Driver for max1363 and similar chips.
13   */
14 
15 #include <linux/interrupt.h>
16 #include <linux/device.h>
17 #include <linux/kernel.h>
18 #include <linux/sysfs.h>
19 #include <linux/list.h>
20 #include <linux/i2c.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/module.h>
25 #include <linux/mod_devicetable.h>
26 #include <linux/property.h>
27 
28 #include <linux/iio/iio.h>
29 #include <linux/iio/sysfs.h>
30 #include <linux/iio/events.h>
31 #include <linux/iio/buffer.h>
32 #include <linux/iio/kfifo_buf.h>
33 #include <linux/iio/trigger_consumer.h>
34 #include <linux/iio/triggered_buffer.h>
35 
36 #define MAX1363_SETUP_BYTE(a) ((a) | 0x80)
37 
38 /* There is a fair bit more defined here than currently
39  * used, but the intention is to support everything these
40  * chips do in the long run */
41 
42 /* see data sheets */
43 /* max1363 and max1236, max1237, max1238, max1239 */
44 #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD	0x00
45 #define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF	0x20
46 #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT	0x40
47 #define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT	0x60
48 #define MAX1363_SETUP_POWER_UP_INT_REF		0x10
49 #define MAX1363_SETUP_POWER_DOWN_INT_REF	0x00
50 
51 /* think about including max11600 etc - more settings */
52 #define MAX1363_SETUP_EXT_CLOCK			0x08
53 #define MAX1363_SETUP_INT_CLOCK			0x00
54 #define MAX1363_SETUP_UNIPOLAR			0x00
55 #define MAX1363_SETUP_BIPOLAR			0x04
56 #define MAX1363_SETUP_RESET			0x00
57 #define MAX1363_SETUP_NORESET			0x02
58 /* max1363 only - though don't care on others.
59  * For now monitor modes are not implemented as the relevant
60  * line is not connected on my test board.
61  * The definitions are here as I intend to add this soon.
62  */
63 #define MAX1363_SETUP_MONITOR_SETUP		0x01
64 
65 /* Specific to the max1363 */
66 #define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
67 #define MAX1363_MON_INT_ENABLE			0x01
68 
69 /* defined for readability reasons */
70 /* All chips */
71 #define MAX1363_CONFIG_BYTE(a) ((a))
72 
73 #define MAX1363_CONFIG_SE			0x01
74 #define MAX1363_CONFIG_DE			0x00
75 #define MAX1363_CONFIG_SCAN_TO_CS		0x00
76 #define MAX1363_CONFIG_SCAN_SINGLE_8		0x20
77 #define MAX1363_CONFIG_SCAN_MONITOR_MODE	0x40
78 #define MAX1363_CONFIG_SCAN_SINGLE_1		0x60
79 /* max123{6-9} only */
80 #define MAX1236_SCAN_MID_TO_CHANNEL		0x40
81 
82 /* max1363 only - merely part of channel selects or don't care for others */
83 #define MAX1363_CONFIG_EN_MON_MODE_READ 0x18
84 
85 #define MAX1363_CHANNEL_SEL(a) ((a) << 1)
86 
87 /* max1363 strictly 0x06 - but doesn't matter */
88 #define MAX1363_CHANNEL_SEL_MASK		0x1E
89 #define MAX1363_SCAN_MASK			0x60
90 #define MAX1363_SE_DE_MASK			0x01
91 
92 #define MAX1363_MAX_CHANNELS 25
93 /**
94  * struct max1363_mode - scan mode information
95  * @conf:	The corresponding value of the configuration register
96  * @modemask:	Bit mask corresponding to channels enabled in this mode
97  */
98 struct max1363_mode {
99 	int8_t		conf;
100 	DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
101 };
102 
103 /* This must be maintained along side the max1363_mode_table in max1363_core */
104 enum max1363_modes {
105 	/* Single read of a single channel */
106 	_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
107 	/* Differential single read */
108 	d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
109 	d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
110 	/* Scan to channel and mid to channel where overlapping */
111 	s0to1, s0to2, s2to3, s0to3, s0to4, s0to5, s0to6,
112 	s6to7, s0to7, s6to8, s0to8, s6to9,
113 	s0to9, s6to10, s0to10, s6to11, s0to11,
114 	/* Differential scan to channel and mid to channel where overlapping */
115 	d0m1to2m3, d0m1to4m5, d0m1to6m7, d6m7to8m9,
116 	d0m1to8m9, d6m7to10m11, d0m1to10m11, d1m0to3m2,
117 	d1m0to5m4, d1m0to7m6, d7m6to9m8, d1m0to9m8,
118 	d7m6to11m10, d1m0to11m10,
119 };
120 
121 /**
122  * struct max1363_chip_info - chip specifc information
123  * @info:		iio core function callbacks structure
124  * @channels:		channel specification
125  * @num_channels:       number of channels
126  * @mode_list:		array of available scan modes
127  * @default_mode:	the scan mode in which the chip starts up
128  * @int_vref_mv:	the internal reference voltage
129  * @num_modes:		number of modes
130  * @bits:		accuracy of the adc in bits
131  */
132 struct max1363_chip_info {
133 	const struct iio_info		*info;
134 	const struct iio_chan_spec	*channels;
135 	int				num_channels;
136 	const enum max1363_modes	*mode_list;
137 	enum max1363_modes		default_mode;
138 	u16				int_vref_mv;
139 	u8				num_modes;
140 	u8				bits;
141 };
142 
143 /**
144  * struct max1363_state - driver instance specific data
145  * @client:		i2c_client
146  * @setupbyte:		cache of current device setup byte
147  * @configbyte:		cache of current device config byte
148  * @chip_info:		chip model specific constants, available modes, etc.
149  * @current_mode:	the scan mode of this chip
150  * @requestedmask:	a valid requested set of channels
151  * @lock:		lock to ensure state is consistent
152  * @monitor_on:		whether monitor mode is enabled
153  * @monitor_speed:	parameter corresponding to device monitor speed setting
154  * @mask_high:		bitmask for enabled high thresholds
155  * @mask_low:		bitmask for enabled low thresholds
156  * @thresh_high:	high threshold values
157  * @thresh_low:		low threshold values
158  * @vref:		Reference voltage regulator
159  * @vref_uv:		Actual (external or internal) reference voltage
160  * @send:		function used to send data to the chip
161  * @recv:		function used to receive data from the chip
162  */
163 struct max1363_state {
164 	struct i2c_client		*client;
165 	u8				setupbyte;
166 	u8				configbyte;
167 	const struct max1363_chip_info	*chip_info;
168 	const struct max1363_mode	*current_mode;
169 	u32				requestedmask;
170 	struct mutex			lock;
171 
172 	/* Using monitor modes and buffer at the same time is
173 	   currently not supported */
174 	bool				monitor_on;
175 	unsigned int			monitor_speed:3;
176 	u8				mask_high;
177 	u8				mask_low;
178 	/* 4x unipolar first then the fours bipolar ones */
179 	s16				thresh_high[8];
180 	s16				thresh_low[8];
181 	struct regulator		*vref;
182 	u32				vref_uv;
183 	int				(*send)(const struct i2c_client *client,
184 						const char *buf, int count);
185 	int				(*recv)(const struct i2c_client *client,
186 						char *buf, int count);
187 };
188 
189 #define MAX1363_MODE_SINGLE(_num, _mask) {				\
190 		.conf = MAX1363_CHANNEL_SEL(_num)			\
191 			| MAX1363_CONFIG_SCAN_SINGLE_1			\
192 			| MAX1363_CONFIG_SE,				\
193 			.modemask[0] = _mask,				\
194 			}
195 
196 #define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) {			\
197 		.conf = MAX1363_CHANNEL_SEL(_num)			\
198 			| MAX1363_CONFIG_SCAN_TO_CS			\
199 			| MAX1363_CONFIG_SE,				\
200 			.modemask[0] = _mask,				\
201 			}
202 
203 /* note not available for max1363 hence naming */
204 #define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num, _mask) {		\
205 		.conf = MAX1363_CHANNEL_SEL(_num)			\
206 			| MAX1236_SCAN_MID_TO_CHANNEL			\
207 			| MAX1363_CONFIG_SE,				\
208 			.modemask[0] = _mask				\
209 }
210 
211 #define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) {			\
212 		.conf = MAX1363_CHANNEL_SEL(_nump)			\
213 			| MAX1363_CONFIG_SCAN_SINGLE_1			\
214 			| MAX1363_CONFIG_DE,				\
215 			.modemask[0] = _mask				\
216 			}
217 
218 /* Can't think how to automate naming so specify for now */
219 #define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(_num, _numvals, _mask) {	\
220 		.conf = MAX1363_CHANNEL_SEL(_num)			\
221 			| MAX1363_CONFIG_SCAN_TO_CS			\
222 			| MAX1363_CONFIG_DE,				\
223 			.modemask[0] = _mask				\
224 			}
225 
226 /* note only available for max1363 hence naming */
227 #define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(_num, _numvals, _mask) {	\
228 		.conf = MAX1363_CHANNEL_SEL(_num)			\
229 			| MAX1236_SCAN_MID_TO_CHANNEL			\
230 			| MAX1363_CONFIG_SE,				\
231 			.modemask[0] = _mask				\
232 }
233 
234 static const struct max1363_mode max1363_mode_table[] = {
235 	/* All of the single channel options first */
236 	MAX1363_MODE_SINGLE(0, 1 << 0),
237 	MAX1363_MODE_SINGLE(1, 1 << 1),
238 	MAX1363_MODE_SINGLE(2, 1 << 2),
239 	MAX1363_MODE_SINGLE(3, 1 << 3),
240 	MAX1363_MODE_SINGLE(4, 1 << 4),
241 	MAX1363_MODE_SINGLE(5, 1 << 5),
242 	MAX1363_MODE_SINGLE(6, 1 << 6),
243 	MAX1363_MODE_SINGLE(7, 1 << 7),
244 	MAX1363_MODE_SINGLE(8, 1 << 8),
245 	MAX1363_MODE_SINGLE(9, 1 << 9),
246 	MAX1363_MODE_SINGLE(10, 1 << 10),
247 	MAX1363_MODE_SINGLE(11, 1 << 11),
248 
249 	MAX1363_MODE_DIFF_SINGLE(0, 1, 1 << 12),
250 	MAX1363_MODE_DIFF_SINGLE(2, 3, 1 << 13),
251 	MAX1363_MODE_DIFF_SINGLE(4, 5, 1 << 14),
252 	MAX1363_MODE_DIFF_SINGLE(6, 7, 1 << 15),
253 	MAX1363_MODE_DIFF_SINGLE(8, 9, 1 << 16),
254 	MAX1363_MODE_DIFF_SINGLE(10, 11, 1 << 17),
255 	MAX1363_MODE_DIFF_SINGLE(1, 0, 1 << 18),
256 	MAX1363_MODE_DIFF_SINGLE(3, 2, 1 << 19),
257 	MAX1363_MODE_DIFF_SINGLE(5, 4, 1 << 20),
258 	MAX1363_MODE_DIFF_SINGLE(7, 6, 1 << 21),
259 	MAX1363_MODE_DIFF_SINGLE(9, 8, 1 << 22),
260 	MAX1363_MODE_DIFF_SINGLE(11, 10, 1 << 23),
261 
262 	/* The multichannel scans next */
263 	MAX1363_MODE_SCAN_TO_CHANNEL(1, 0x003),
264 	MAX1363_MODE_SCAN_TO_CHANNEL(2, 0x007),
265 	MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3, 0x00C),
266 	MAX1363_MODE_SCAN_TO_CHANNEL(3, 0x00F),
267 	MAX1363_MODE_SCAN_TO_CHANNEL(4, 0x01F),
268 	MAX1363_MODE_SCAN_TO_CHANNEL(5, 0x03F),
269 	MAX1363_MODE_SCAN_TO_CHANNEL(6, 0x07F),
270 	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7, 0x0C0),
271 	MAX1363_MODE_SCAN_TO_CHANNEL(7, 0x0FF),
272 	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8, 0x1C0),
273 	MAX1363_MODE_SCAN_TO_CHANNEL(8, 0x1FF),
274 	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9, 0x3C0),
275 	MAX1363_MODE_SCAN_TO_CHANNEL(9, 0x3FF),
276 	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10, 0x7C0),
277 	MAX1363_MODE_SCAN_TO_CHANNEL(10, 0x7FF),
278 	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11, 0xFC0),
279 	MAX1363_MODE_SCAN_TO_CHANNEL(11, 0xFFF),
280 
281 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(2, 2, 0x003000),
282 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(4, 3, 0x007000),
283 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(6, 4, 0x00F000),
284 	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(8, 2, 0x018000),
285 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(8, 5, 0x01F000),
286 	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(10, 3, 0x038000),
287 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(10, 6, 0x3F000),
288 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(3, 2, 0x0C0000),
289 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(5, 3, 0x1C0000),
290 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(7, 4, 0x3C0000),
291 	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(9, 2, 0x600000),
292 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(9, 5, 0x7C0000),
293 	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(11, 3, 0xE00000),
294 	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(11, 6, 0xFC0000),
295 };
296 
297 static const struct max1363_mode
max1363_match_mode(const unsigned long * mask,const struct max1363_chip_info * ci)298 *max1363_match_mode(const unsigned long *mask,
299 	const struct max1363_chip_info *ci)
300 {
301 	int i;
302 	if (mask)
303 		for (i = 0; i < ci->num_modes; i++)
304 			if (bitmap_subset(mask,
305 					  max1363_mode_table[ci->mode_list[i]].
306 					  modemask,
307 					  MAX1363_MAX_CHANNELS))
308 				return &max1363_mode_table[ci->mode_list[i]];
309 	return NULL;
310 }
311 
max1363_smbus_send(const struct i2c_client * client,const char * buf,int count)312 static int max1363_smbus_send(const struct i2c_client *client, const char *buf,
313 		int count)
314 {
315 	int i, err;
316 
317 	for (i = err = 0; err == 0 && i < count; ++i)
318 		err = i2c_smbus_write_byte(client, buf[i]);
319 
320 	return err ? err : count;
321 }
322 
max1363_smbus_recv(const struct i2c_client * client,char * buf,int count)323 static int max1363_smbus_recv(const struct i2c_client *client, char *buf,
324 		int count)
325 {
326 	int i, ret;
327 
328 	for (i = 0; i < count; ++i) {
329 		ret = i2c_smbus_read_byte(client);
330 		if (ret < 0)
331 			return ret;
332 		buf[i] = ret;
333 	}
334 
335 	return count;
336 }
337 
max1363_write_basic_config(struct max1363_state * st)338 static int max1363_write_basic_config(struct max1363_state *st)
339 {
340 	u8 tx_buf[2] = { st->setupbyte, st->configbyte };
341 
342 	return st->send(st->client, tx_buf, 2);
343 }
344 
max1363_set_scan_mode(struct max1363_state * st)345 static int max1363_set_scan_mode(struct max1363_state *st)
346 {
347 	st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
348 			    | MAX1363_SCAN_MASK
349 			    | MAX1363_SE_DE_MASK);
350 	st->configbyte |= st->current_mode->conf;
351 
352 	return max1363_write_basic_config(st);
353 }
354 
max1363_read_single_chan(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,long m)355 static int max1363_read_single_chan(struct iio_dev *indio_dev,
356 				    struct iio_chan_spec const *chan,
357 				    int *val,
358 				    long m)
359 {
360 	int ret = 0;
361 	s32 data;
362 	u8 rxbuf[2];
363 	struct max1363_state *st = iio_priv(indio_dev);
364 	struct i2c_client *client = st->client;
365 
366 	ret = iio_device_claim_direct_mode(indio_dev);
367 	if (ret)
368 		return ret;
369 	mutex_lock(&st->lock);
370 
371 	/*
372 	 * If monitor mode is enabled, the method for reading a single
373 	 * channel will have to be rather different and has not yet
374 	 * been implemented.
375 	 *
376 	 * Also, cannot read directly if buffered capture enabled.
377 	 */
378 	if (st->monitor_on) {
379 		ret = -EBUSY;
380 		goto error_ret;
381 	}
382 
383 	/* Check to see if current scan mode is correct */
384 	if (st->current_mode != &max1363_mode_table[chan->address]) {
385 		/* Update scan mode if needed */
386 		st->current_mode = &max1363_mode_table[chan->address];
387 		ret = max1363_set_scan_mode(st);
388 		if (ret < 0)
389 			goto error_ret;
390 	}
391 	if (st->chip_info->bits != 8) {
392 		/* Get reading */
393 		data = st->recv(client, rxbuf, 2);
394 		if (data < 0) {
395 			ret = data;
396 			goto error_ret;
397 		}
398 		data = (rxbuf[1] | rxbuf[0] << 8) &
399 		  ((1 << st->chip_info->bits) - 1);
400 	} else {
401 		/* Get reading */
402 		data = st->recv(client, rxbuf, 1);
403 		if (data < 0) {
404 			ret = data;
405 			goto error_ret;
406 		}
407 		data = rxbuf[0];
408 	}
409 	*val = data;
410 
411 error_ret:
412 	mutex_unlock(&st->lock);
413 	iio_device_release_direct_mode(indio_dev);
414 	return ret;
415 
416 }
417 
max1363_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long m)418 static int max1363_read_raw(struct iio_dev *indio_dev,
419 			    struct iio_chan_spec const *chan,
420 			    int *val,
421 			    int *val2,
422 			    long m)
423 {
424 	struct max1363_state *st = iio_priv(indio_dev);
425 	int ret;
426 
427 	switch (m) {
428 	case IIO_CHAN_INFO_RAW:
429 		ret = max1363_read_single_chan(indio_dev, chan, val, m);
430 		if (ret < 0)
431 			return ret;
432 		return IIO_VAL_INT;
433 	case IIO_CHAN_INFO_SCALE:
434 		*val = st->vref_uv / 1000;
435 		*val2 = st->chip_info->bits;
436 		return IIO_VAL_FRACTIONAL_LOG2;
437 	default:
438 		return -EINVAL;
439 	}
440 	return 0;
441 }
442 
443 /* Applies to max1363 */
444 static const enum max1363_modes max1363_mode_list[] = {
445 	_s0, _s1, _s2, _s3,
446 	s0to1, s0to2, s0to3,
447 	d0m1, d2m3, d1m0, d3m2,
448 	d0m1to2m3, d1m0to3m2,
449 };
450 
451 static const struct iio_event_spec max1363_events[] = {
452 	{
453 		.type = IIO_EV_TYPE_THRESH,
454 		.dir = IIO_EV_DIR_RISING,
455 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
456 			BIT(IIO_EV_INFO_ENABLE),
457 	}, {
458 		.type = IIO_EV_TYPE_THRESH,
459 		.dir = IIO_EV_DIR_FALLING,
460 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
461 			BIT(IIO_EV_INFO_ENABLE),
462 	},
463 };
464 
465 #define MAX1363_CHAN_U(num, addr, si, bits, ev_spec, num_ev_spec)	\
466 	{								\
467 		.type = IIO_VOLTAGE,					\
468 		.indexed = 1,						\
469 		.channel = num,						\
470 		.address = addr,					\
471 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
472 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
473 		.datasheet_name = "AIN"#num,				\
474 		.scan_type = {						\
475 			.sign = 'u',					\
476 			.realbits = bits,				\
477 			.storagebits = (bits > 8) ? 16 : 8,		\
478 			.endianness = IIO_BE,				\
479 		},							\
480 		.scan_index = si,					\
481 		.event_spec = ev_spec,					\
482 		.num_event_specs = num_ev_spec,				\
483 	}
484 
485 /* bipolar channel */
486 #define MAX1363_CHAN_B(num, num2, addr, si, bits, ev_spec, num_ev_spec)	\
487 	{								\
488 		.type = IIO_VOLTAGE,					\
489 		.differential = 1,					\
490 		.indexed = 1,						\
491 		.channel = num,						\
492 		.channel2 = num2,					\
493 		.address = addr,					\
494 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
495 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
496 		.datasheet_name = "AIN"#num"-AIN"#num2,			\
497 		.scan_type = {						\
498 			.sign = 's',					\
499 			.realbits = bits,				\
500 			.storagebits = (bits > 8) ? 16 : 8,		\
501 			.endianness = IIO_BE,				\
502 		},							\
503 		.scan_index = si,					\
504 		.event_spec = ev_spec,					\
505 		.num_event_specs = num_ev_spec,				\
506 	}
507 
508 #define MAX1363_4X_CHANS(bits, ev_spec, num_ev_spec) {			\
509 	MAX1363_CHAN_U(0, _s0, 0, bits, ev_spec, num_ev_spec),		\
510 	MAX1363_CHAN_U(1, _s1, 1, bits, ev_spec, num_ev_spec),		\
511 	MAX1363_CHAN_U(2, _s2, 2, bits, ev_spec, num_ev_spec),		\
512 	MAX1363_CHAN_U(3, _s3, 3, bits, ev_spec, num_ev_spec),		\
513 	MAX1363_CHAN_B(0, 1, d0m1, 4, bits, ev_spec, num_ev_spec),	\
514 	MAX1363_CHAN_B(2, 3, d2m3, 5, bits, ev_spec, num_ev_spec),	\
515 	MAX1363_CHAN_B(1, 0, d1m0, 6, bits, ev_spec, num_ev_spec),	\
516 	MAX1363_CHAN_B(3, 2, d3m2, 7, bits, ev_spec, num_ev_spec),	\
517 	IIO_CHAN_SOFT_TIMESTAMP(8)					\
518 	}
519 
520 static const struct iio_chan_spec max1036_channels[] =
521 	MAX1363_4X_CHANS(8, NULL, 0);
522 static const struct iio_chan_spec max1136_channels[] =
523 	MAX1363_4X_CHANS(10, NULL, 0);
524 static const struct iio_chan_spec max1236_channels[] =
525 	MAX1363_4X_CHANS(12, NULL, 0);
526 static const struct iio_chan_spec max1361_channels[] =
527 	MAX1363_4X_CHANS(10, max1363_events, ARRAY_SIZE(max1363_events));
528 static const struct iio_chan_spec max1363_channels[] =
529 	MAX1363_4X_CHANS(12, max1363_events, ARRAY_SIZE(max1363_events));
530 
531 /* Applies to max1236, max1237 */
532 static const enum max1363_modes max1236_mode_list[] = {
533 	_s0, _s1, _s2, _s3,
534 	s0to1, s0to2, s0to3,
535 	d0m1, d2m3, d1m0, d3m2,
536 	d0m1to2m3, d1m0to3m2,
537 	s2to3,
538 };
539 
540 /* Applies to max1238, max1239 */
541 static const enum max1363_modes max1238_mode_list[] = {
542 	_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
543 	s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
544 	s0to7, s0to8, s0to9, s0to10, s0to11,
545 	d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
546 	d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
547 	d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
548 	d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
549 	s6to7, s6to8, s6to9, s6to10, s6to11,
550 	d6m7to8m9, d6m7to10m11, d7m6to9m8, d7m6to11m10,
551 };
552 
553 #define MAX1363_12X_CHANS(bits) {				\
554 	MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0),		\
555 	MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0),		\
556 	MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0),		\
557 	MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0),		\
558 	MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0),		\
559 	MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0),		\
560 	MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0),		\
561 	MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0),		\
562 	MAX1363_CHAN_U(8, _s8, 8, bits, NULL, 0),		\
563 	MAX1363_CHAN_U(9, _s9, 9, bits, NULL, 0),		\
564 	MAX1363_CHAN_U(10, _s10, 10, bits, NULL, 0),		\
565 	MAX1363_CHAN_U(11, _s11, 11, bits, NULL, 0),		\
566 	MAX1363_CHAN_B(0, 1, d0m1, 12, bits, NULL, 0),		\
567 	MAX1363_CHAN_B(2, 3, d2m3, 13, bits, NULL, 0),		\
568 	MAX1363_CHAN_B(4, 5, d4m5, 14, bits, NULL, 0),		\
569 	MAX1363_CHAN_B(6, 7, d6m7, 15, bits, NULL, 0),		\
570 	MAX1363_CHAN_B(8, 9, d8m9, 16, bits, NULL, 0),		\
571 	MAX1363_CHAN_B(10, 11, d10m11, 17, bits, NULL, 0),	\
572 	MAX1363_CHAN_B(1, 0, d1m0, 18, bits, NULL, 0),		\
573 	MAX1363_CHAN_B(3, 2, d3m2, 19, bits, NULL, 0),		\
574 	MAX1363_CHAN_B(5, 4, d5m4, 20, bits, NULL, 0),		\
575 	MAX1363_CHAN_B(7, 6, d7m6, 21, bits, NULL, 0),		\
576 	MAX1363_CHAN_B(9, 8, d9m8, 22, bits, NULL, 0),		\
577 	MAX1363_CHAN_B(11, 10, d11m10, 23, bits, NULL, 0),	\
578 	IIO_CHAN_SOFT_TIMESTAMP(24)				\
579 	}
580 static const struct iio_chan_spec max1038_channels[] = MAX1363_12X_CHANS(8);
581 static const struct iio_chan_spec max1138_channels[] = MAX1363_12X_CHANS(10);
582 static const struct iio_chan_spec max1238_channels[] = MAX1363_12X_CHANS(12);
583 
584 static const enum max1363_modes max11607_mode_list[] = {
585 	_s0, _s1, _s2, _s3,
586 	s0to1, s0to2, s0to3,
587 	s2to3,
588 	d0m1, d2m3, d1m0, d3m2,
589 	d0m1to2m3, d1m0to3m2,
590 };
591 
592 static const enum max1363_modes max11608_mode_list[] = {
593 	_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7,
594 	s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, s0to7,
595 	s6to7,
596 	d0m1, d2m3, d4m5, d6m7,
597 	d1m0, d3m2, d5m4, d7m6,
598 	d0m1to2m3, d0m1to4m5, d0m1to6m7,
599 	d1m0to3m2, d1m0to5m4, d1m0to7m6,
600 };
601 
602 #define MAX1363_8X_CHANS(bits) {			\
603 	MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0),	\
604 	MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0),	\
605 	MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0),	\
606 	MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0),	\
607 	MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0),	\
608 	MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0),	\
609 	MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0),	\
610 	MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0),	\
611 	MAX1363_CHAN_B(0, 1, d0m1, 8, bits, NULL, 0),	\
612 	MAX1363_CHAN_B(2, 3, d2m3, 9, bits, NULL, 0),	\
613 	MAX1363_CHAN_B(4, 5, d4m5, 10, bits, NULL, 0),	\
614 	MAX1363_CHAN_B(6, 7, d6m7, 11, bits, NULL, 0),	\
615 	MAX1363_CHAN_B(1, 0, d1m0, 12, bits, NULL, 0),	\
616 	MAX1363_CHAN_B(3, 2, d3m2, 13, bits, NULL, 0),	\
617 	MAX1363_CHAN_B(5, 4, d5m4, 14, bits, NULL, 0),	\
618 	MAX1363_CHAN_B(7, 6, d7m6, 15, bits, NULL, 0),	\
619 	IIO_CHAN_SOFT_TIMESTAMP(16)			\
620 }
621 static const struct iio_chan_spec max11602_channels[] = MAX1363_8X_CHANS(8);
622 static const struct iio_chan_spec max11608_channels[] = MAX1363_8X_CHANS(10);
623 static const struct iio_chan_spec max11614_channels[] = MAX1363_8X_CHANS(12);
624 
625 static const enum max1363_modes max11644_mode_list[] = {
626 	_s0, _s1, s0to1, d0m1, d1m0,
627 };
628 
629 #define MAX1363_2X_CHANS(bits) {			\
630 	MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0),	\
631 	MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0),	\
632 	MAX1363_CHAN_B(0, 1, d0m1, 2, bits, NULL, 0),	\
633 	MAX1363_CHAN_B(1, 0, d1m0, 3, bits, NULL, 0),	\
634 	IIO_CHAN_SOFT_TIMESTAMP(4)			\
635 	}
636 
637 static const struct iio_chan_spec max11646_channels[] = MAX1363_2X_CHANS(10);
638 static const struct iio_chan_spec max11644_channels[] = MAX1363_2X_CHANS(12);
639 
640 enum { max1361,
641        max1362,
642        max1363,
643        max1364,
644        max1036,
645        max1037,
646        max1038,
647        max1039,
648        max1136,
649        max1137,
650        max1138,
651        max1139,
652        max1236,
653        max1237,
654        max1238,
655        max1239,
656        max11600,
657        max11601,
658        max11602,
659        max11603,
660        max11604,
661        max11605,
662        max11606,
663        max11607,
664        max11608,
665        max11609,
666        max11610,
667        max11611,
668        max11612,
669        max11613,
670        max11614,
671        max11615,
672        max11616,
673        max11617,
674        max11644,
675        max11645,
676        max11646,
677        max11647
678 };
679 
680 static const int max1363_monitor_speeds[] = { 133000, 665000, 33300, 16600,
681 					      8300, 4200, 2000, 1000 };
682 
max1363_monitor_show_freq(struct device * dev,struct device_attribute * attr,char * buf)683 static ssize_t max1363_monitor_show_freq(struct device *dev,
684 					struct device_attribute *attr,
685 					char *buf)
686 {
687 	struct max1363_state *st = iio_priv(dev_to_iio_dev(dev));
688 	return sprintf(buf, "%d\n", max1363_monitor_speeds[st->monitor_speed]);
689 }
690 
max1363_monitor_store_freq(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)691 static ssize_t max1363_monitor_store_freq(struct device *dev,
692 					struct device_attribute *attr,
693 					const char *buf,
694 					size_t len)
695 {
696 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
697 	struct max1363_state *st = iio_priv(indio_dev);
698 	int i, ret;
699 	unsigned long val;
700 	bool found = false;
701 
702 	ret = kstrtoul(buf, 10, &val);
703 	if (ret)
704 		return -EINVAL;
705 	for (i = 0; i < ARRAY_SIZE(max1363_monitor_speeds); i++)
706 		if (val == max1363_monitor_speeds[i]) {
707 			found = true;
708 			break;
709 		}
710 	if (!found)
711 		return -EINVAL;
712 
713 	mutex_lock(&st->lock);
714 	st->monitor_speed = i;
715 	mutex_unlock(&st->lock);
716 
717 	return 0;
718 }
719 
720 static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
721 			max1363_monitor_show_freq,
722 			max1363_monitor_store_freq);
723 
724 static IIO_CONST_ATTR(sampling_frequency_available,
725 		"133000 665000 33300 16600 8300 4200 2000 1000");
726 
max1363_read_thresh(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int * val,int * val2)727 static int max1363_read_thresh(struct iio_dev *indio_dev,
728 	const struct iio_chan_spec *chan, enum iio_event_type type,
729 	enum iio_event_direction dir, enum iio_event_info info, int *val,
730 	int *val2)
731 {
732 	struct max1363_state *st = iio_priv(indio_dev);
733 	if (dir == IIO_EV_DIR_FALLING)
734 		*val = st->thresh_low[chan->channel];
735 	else
736 		*val = st->thresh_high[chan->channel];
737 	return IIO_VAL_INT;
738 }
739 
max1363_write_thresh(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int val,int val2)740 static int max1363_write_thresh(struct iio_dev *indio_dev,
741 	const struct iio_chan_spec *chan, enum iio_event_type type,
742 	enum iio_event_direction dir, enum iio_event_info info, int val,
743 	int val2)
744 {
745 	struct max1363_state *st = iio_priv(indio_dev);
746 	/* make it handle signed correctly as well */
747 	switch (st->chip_info->bits) {
748 	case 10:
749 		if (val > 0x3FF)
750 			return -EINVAL;
751 		break;
752 	case 12:
753 		if (val > 0xFFF)
754 			return -EINVAL;
755 		break;
756 	}
757 
758 	switch (dir) {
759 	case IIO_EV_DIR_FALLING:
760 		st->thresh_low[chan->channel] = val;
761 		break;
762 	case IIO_EV_DIR_RISING:
763 		st->thresh_high[chan->channel] = val;
764 		break;
765 	default:
766 		return -EINVAL;
767 	}
768 
769 	return 0;
770 }
771 
772 static const u64 max1363_event_codes[] = {
773 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
774 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
775 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
776 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
777 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
778 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
779 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
780 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
781 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
782 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
783 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
784 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
785 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
786 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
787 	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
788 			     IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
789 };
790 
max1363_event_handler(int irq,void * private)791 static irqreturn_t max1363_event_handler(int irq, void *private)
792 {
793 	struct iio_dev *indio_dev = private;
794 	struct max1363_state *st = iio_priv(indio_dev);
795 	s64 timestamp = iio_get_time_ns(indio_dev);
796 	unsigned long mask, loc;
797 	u8 rx;
798 	u8 tx[2] = { st->setupbyte,
799 		     MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };
800 
801 	st->recv(st->client, &rx, 1);
802 	mask = rx;
803 	for_each_set_bit(loc, &mask, 8)
804 		iio_push_event(indio_dev, max1363_event_codes[loc], timestamp);
805 	st->send(st->client, tx, 2);
806 
807 	return IRQ_HANDLED;
808 }
809 
max1363_read_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)810 static int max1363_read_event_config(struct iio_dev *indio_dev,
811 	const struct iio_chan_spec *chan, enum iio_event_type type,
812 	enum iio_event_direction dir)
813 {
814 	struct max1363_state *st = iio_priv(indio_dev);
815 	int val;
816 	int number = chan->channel;
817 
818 	mutex_lock(&st->lock);
819 	if (dir == IIO_EV_DIR_FALLING)
820 		val = (1 << number) & st->mask_low;
821 	else
822 		val = (1 << number) & st->mask_high;
823 	mutex_unlock(&st->lock);
824 
825 	return val;
826 }
827 
max1363_monitor_mode_update(struct max1363_state * st,int enabled)828 static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
829 {
830 	u8 *tx_buf;
831 	int ret, i = 3, j;
832 	unsigned long numelements;
833 	int len;
834 	const long *modemask;
835 
836 	if (!enabled) {
837 		/* transition to buffered capture is not currently supported */
838 		st->setupbyte &= ~MAX1363_SETUP_MONITOR_SETUP;
839 		st->configbyte &= ~MAX1363_SCAN_MASK;
840 		st->monitor_on = false;
841 		return max1363_write_basic_config(st);
842 	}
843 
844 	/* Ensure we are in the relevant mode */
845 	st->setupbyte |= MAX1363_SETUP_MONITOR_SETUP;
846 	st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
847 			    | MAX1363_SCAN_MASK
848 			| MAX1363_SE_DE_MASK);
849 	st->configbyte |= MAX1363_CONFIG_SCAN_MONITOR_MODE;
850 	if ((st->mask_low | st->mask_high) & 0x0F) {
851 		st->configbyte |= max1363_mode_table[s0to3].conf;
852 		modemask = max1363_mode_table[s0to3].modemask;
853 	} else if ((st->mask_low | st->mask_high) & 0x30) {
854 		st->configbyte |= max1363_mode_table[d0m1to2m3].conf;
855 		modemask = max1363_mode_table[d0m1to2m3].modemask;
856 	} else {
857 		st->configbyte |= max1363_mode_table[d1m0to3m2].conf;
858 		modemask = max1363_mode_table[d1m0to3m2].modemask;
859 	}
860 	numelements = bitmap_weight(modemask, MAX1363_MAX_CHANNELS);
861 	len = 3 * numelements + 3;
862 	tx_buf = kmalloc(len, GFP_KERNEL);
863 	if (!tx_buf) {
864 		ret = -ENOMEM;
865 		goto error_ret;
866 	}
867 	tx_buf[0] = st->configbyte;
868 	tx_buf[1] = st->setupbyte;
869 	tx_buf[2] = (st->monitor_speed << 1);
870 
871 	/*
872 	 * So we need to do yet another bit of nefarious scan mode
873 	 * setup to match what we need.
874 	 */
875 	for (j = 0; j < 8; j++)
876 		if (test_bit(j, modemask)) {
877 			/* Establish the mode is in the scan */
878 			if (st->mask_low & (1 << j)) {
879 				tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;
880 				tx_buf[i + 1] = (st->thresh_low[j] << 4) & 0xF0;
881 			} else if (j < 4) {
882 				tx_buf[i] = 0;
883 				tx_buf[i + 1] = 0;
884 			} else {
885 				tx_buf[i] = 0x80;
886 				tx_buf[i + 1] = 0;
887 			}
888 			if (st->mask_high & (1 << j)) {
889 				tx_buf[i + 1] |=
890 					(st->thresh_high[j] >> 8) & 0x0F;
891 				tx_buf[i + 2] = st->thresh_high[j] & 0xFF;
892 			} else if (j < 4) {
893 				tx_buf[i + 1] |= 0x0F;
894 				tx_buf[i + 2] = 0xFF;
895 			} else {
896 				tx_buf[i + 1] |= 0x07;
897 				tx_buf[i + 2] = 0xFF;
898 			}
899 			i += 3;
900 		}
901 
902 
903 	ret = st->send(st->client, tx_buf, len);
904 	if (ret < 0)
905 		goto error_ret;
906 	if (ret != len) {
907 		ret = -EIO;
908 		goto error_ret;
909 	}
910 
911 	/*
912 	 * Now that we hopefully have sensible thresholds in place it is
913 	 * time to turn the interrupts on.
914 	 * It is unclear from the data sheet if this should be necessary
915 	 * (i.e. whether monitor mode setup is atomic) but it appears to
916 	 * be in practice.
917 	 */
918 	tx_buf[0] = st->setupbyte;
919 	tx_buf[1] = MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0;
920 	ret = st->send(st->client, tx_buf, 2);
921 	if (ret < 0)
922 		goto error_ret;
923 	if (ret != 2) {
924 		ret = -EIO;
925 		goto error_ret;
926 	}
927 	ret = 0;
928 	st->monitor_on = true;
929 error_ret:
930 
931 	kfree(tx_buf);
932 
933 	return ret;
934 }
935 
936 /*
937  * To keep this manageable we always use one of 3 scan modes.
938  * Scan 0...3, 0-1,2-3 and 1-0,3-2
939  */
940 
__max1363_check_event_mask(int thismask,int checkmask)941 static inline int __max1363_check_event_mask(int thismask, int checkmask)
942 {
943 	int ret = 0;
944 	/* Is it unipolar */
945 	if (thismask < 4) {
946 		if (checkmask & ~0x0F) {
947 			ret = -EBUSY;
948 			goto error_ret;
949 		}
950 	} else if (thismask < 6) {
951 		if (checkmask & ~0x30) {
952 			ret = -EBUSY;
953 			goto error_ret;
954 		}
955 	} else if (checkmask & ~0xC0)
956 		ret = -EBUSY;
957 error_ret:
958 	return ret;
959 }
960 
max1363_write_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)961 static int max1363_write_event_config(struct iio_dev *indio_dev,
962 	const struct iio_chan_spec *chan, enum iio_event_type type,
963 	enum iio_event_direction dir, int state)
964 {
965 	int ret = 0;
966 	struct max1363_state *st = iio_priv(indio_dev);
967 	u16 unifiedmask;
968 	int number = chan->channel;
969 
970 	ret = iio_device_claim_direct_mode(indio_dev);
971 	if (ret)
972 		return ret;
973 	mutex_lock(&st->lock);
974 
975 	unifiedmask = st->mask_low | st->mask_high;
976 	if (dir == IIO_EV_DIR_FALLING) {
977 
978 		if (state == 0)
979 			st->mask_low &= ~(1 << number);
980 		else {
981 			ret = __max1363_check_event_mask((1 << number),
982 							 unifiedmask);
983 			if (ret)
984 				goto error_ret;
985 			st->mask_low |= (1 << number);
986 		}
987 	} else {
988 		if (state == 0)
989 			st->mask_high &= ~(1 << number);
990 		else {
991 			ret = __max1363_check_event_mask((1 << number),
992 							 unifiedmask);
993 			if (ret)
994 				goto error_ret;
995 			st->mask_high |= (1 << number);
996 		}
997 	}
998 
999 	max1363_monitor_mode_update(st, !!(st->mask_high | st->mask_low));
1000 error_ret:
1001 	mutex_unlock(&st->lock);
1002 	iio_device_release_direct_mode(indio_dev);
1003 
1004 	return ret;
1005 }
1006 
1007 /*
1008  * As with scan_elements, only certain sets of these can
1009  * be combined.
1010  */
1011 static struct attribute *max1363_event_attributes[] = {
1012 	&iio_dev_attr_sampling_frequency.dev_attr.attr,
1013 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
1014 	NULL,
1015 };
1016 
1017 static const struct attribute_group max1363_event_attribute_group = {
1018 	.attrs = max1363_event_attributes,
1019 };
1020 
max1363_update_scan_mode(struct iio_dev * indio_dev,const unsigned long * scan_mask)1021 static int max1363_update_scan_mode(struct iio_dev *indio_dev,
1022 				    const unsigned long *scan_mask)
1023 {
1024 	struct max1363_state *st = iio_priv(indio_dev);
1025 
1026 	/*
1027 	 * Need to figure out the current mode based upon the requested
1028 	 * scan mask in iio_dev
1029 	 */
1030 	st->current_mode = max1363_match_mode(scan_mask, st->chip_info);
1031 	if (!st->current_mode)
1032 		return -EINVAL;
1033 	max1363_set_scan_mode(st);
1034 	return 0;
1035 }
1036 
1037 static const struct iio_info max1238_info = {
1038 	.read_raw = &max1363_read_raw,
1039 	.update_scan_mode = &max1363_update_scan_mode,
1040 };
1041 
1042 static const struct iio_info max1363_info = {
1043 	.read_event_value = &max1363_read_thresh,
1044 	.write_event_value = &max1363_write_thresh,
1045 	.read_event_config = &max1363_read_event_config,
1046 	.write_event_config = &max1363_write_event_config,
1047 	.read_raw = &max1363_read_raw,
1048 	.update_scan_mode = &max1363_update_scan_mode,
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 = 4096,
1257 		.mode_list = max1238_mode_list,
1258 		.num_modes = ARRAY_SIZE(max1238_mode_list),
1259 		.default_mode = s0to11,
1260 		.info = &max1238_info,
1261 		.channels = max1038_channels,
1262 		.num_channels = ARRAY_SIZE(max1038_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 = max1038_channels,
1272 		.num_channels = ARRAY_SIZE(max1038_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 = 4096,
1317 		.mode_list = max1238_mode_list,
1318 		.num_modes = ARRAY_SIZE(max1238_mode_list),
1319 		.default_mode = s0to11,
1320 		.info = &max1238_info,
1321 		.channels = max1138_channels,
1322 		.num_channels = ARRAY_SIZE(max1138_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 = max1138_channels,
1332 		.num_channels = ARRAY_SIZE(max1138_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 = 4096,
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 = 4096,
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 = 2048,
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 = 4096,
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 = 2048,
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 
max1363_initial_setup(struct max1363_state * st)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 
max1363_alloc_scan_masks(struct iio_dev * indio_dev)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 			array3_size(BITS_TO_LONGS(MAX1363_MAX_CHANNELS),
1464 				    sizeof(long),
1465 				    st->chip_info->num_modes + 1),
1466 			GFP_KERNEL);
1467 	if (!masks)
1468 		return -ENOMEM;
1469 
1470 	for (i = 0; i < st->chip_info->num_modes; i++)
1471 		bitmap_copy(masks + BITS_TO_LONGS(MAX1363_MAX_CHANNELS)*i,
1472 			    max1363_mode_table[st->chip_info->mode_list[i]]
1473 			    .modemask, MAX1363_MAX_CHANNELS);
1474 
1475 	indio_dev->available_scan_masks = masks;
1476 
1477 	return 0;
1478 }
1479 
max1363_trigger_handler(int irq,void * p)1480 static irqreturn_t max1363_trigger_handler(int irq, void *p)
1481 {
1482 	struct iio_poll_func *pf = p;
1483 	struct iio_dev *indio_dev = pf->indio_dev;
1484 	struct max1363_state *st = iio_priv(indio_dev);
1485 	__u8 *rxbuf;
1486 	int b_sent;
1487 	size_t d_size;
1488 	unsigned long numvals = bitmap_weight(st->current_mode->modemask,
1489 					      MAX1363_MAX_CHANNELS);
1490 
1491 	/* Ensure the timestamp is 8 byte aligned */
1492 	if (st->chip_info->bits != 8)
1493 		d_size = numvals*2;
1494 	else
1495 		d_size = numvals;
1496 	if (indio_dev->scan_timestamp) {
1497 		d_size += sizeof(s64);
1498 		if (d_size % sizeof(s64))
1499 			d_size += sizeof(s64) - (d_size % sizeof(s64));
1500 	}
1501 	/* Monitor mode prevents reading. Whilst not currently implemented
1502 	 * might as well have this test in here in the meantime as it does
1503 	 * no harm.
1504 	 */
1505 	if (numvals == 0)
1506 		goto done;
1507 
1508 	rxbuf = kmalloc(d_size,	GFP_KERNEL);
1509 	if (rxbuf == NULL)
1510 		goto done;
1511 	if (st->chip_info->bits != 8)
1512 		b_sent = st->recv(st->client, rxbuf, numvals * 2);
1513 	else
1514 		b_sent = st->recv(st->client, rxbuf, numvals);
1515 	if (b_sent < 0)
1516 		goto done_free;
1517 
1518 	iio_push_to_buffers_with_timestamp(indio_dev, rxbuf,
1519 					   iio_get_time_ns(indio_dev));
1520 
1521 done_free:
1522 	kfree(rxbuf);
1523 done:
1524 	iio_trigger_notify_done(indio_dev->trig);
1525 
1526 	return IRQ_HANDLED;
1527 }
1528 
1529 #define MAX1363_COMPATIBLE(of_compatible, cfg) {		\
1530 			.compatible = of_compatible,		\
1531 			.data = &max1363_chip_info_tbl[cfg],	\
1532 }
1533 
1534 static const struct of_device_id max1363_of_match[] = {
1535 	MAX1363_COMPATIBLE("maxim,max1361", max1361),
1536 	MAX1363_COMPATIBLE("maxim,max1362", max1362),
1537 	MAX1363_COMPATIBLE("maxim,max1363", max1363),
1538 	MAX1363_COMPATIBLE("maxim,max1364", max1364),
1539 	MAX1363_COMPATIBLE("maxim,max1036", max1036),
1540 	MAX1363_COMPATIBLE("maxim,max1037", max1037),
1541 	MAX1363_COMPATIBLE("maxim,max1038", max1038),
1542 	MAX1363_COMPATIBLE("maxim,max1039", max1039),
1543 	MAX1363_COMPATIBLE("maxim,max1136", max1136),
1544 	MAX1363_COMPATIBLE("maxim,max1137", max1137),
1545 	MAX1363_COMPATIBLE("maxim,max1138", max1138),
1546 	MAX1363_COMPATIBLE("maxim,max1139", max1139),
1547 	MAX1363_COMPATIBLE("maxim,max1236", max1236),
1548 	MAX1363_COMPATIBLE("maxim,max1237", max1237),
1549 	MAX1363_COMPATIBLE("maxim,max1238", max1238),
1550 	MAX1363_COMPATIBLE("maxim,max1239", max1239),
1551 	MAX1363_COMPATIBLE("maxim,max11600", max11600),
1552 	MAX1363_COMPATIBLE("maxim,max11601", max11601),
1553 	MAX1363_COMPATIBLE("maxim,max11602", max11602),
1554 	MAX1363_COMPATIBLE("maxim,max11603", max11603),
1555 	MAX1363_COMPATIBLE("maxim,max11604", max11604),
1556 	MAX1363_COMPATIBLE("maxim,max11605", max11605),
1557 	MAX1363_COMPATIBLE("maxim,max11606", max11606),
1558 	MAX1363_COMPATIBLE("maxim,max11607", max11607),
1559 	MAX1363_COMPATIBLE("maxim,max11608", max11608),
1560 	MAX1363_COMPATIBLE("maxim,max11609", max11609),
1561 	MAX1363_COMPATIBLE("maxim,max11610", max11610),
1562 	MAX1363_COMPATIBLE("maxim,max11611", max11611),
1563 	MAX1363_COMPATIBLE("maxim,max11612", max11612),
1564 	MAX1363_COMPATIBLE("maxim,max11613", max11613),
1565 	MAX1363_COMPATIBLE("maxim,max11614", max11614),
1566 	MAX1363_COMPATIBLE("maxim,max11615", max11615),
1567 	MAX1363_COMPATIBLE("maxim,max11616", max11616),
1568 	MAX1363_COMPATIBLE("maxim,max11617", max11617),
1569 	MAX1363_COMPATIBLE("maxim,max11644", max11644),
1570 	MAX1363_COMPATIBLE("maxim,max11645", max11645),
1571 	MAX1363_COMPATIBLE("maxim,max11646", max11646),
1572 	MAX1363_COMPATIBLE("maxim,max11647", max11647),
1573 	{ /* sentinel */ }
1574 };
1575 MODULE_DEVICE_TABLE(of, max1363_of_match);
1576 
max1363_reg_disable(void * reg)1577 static void max1363_reg_disable(void *reg)
1578 {
1579 	regulator_disable(reg);
1580 }
1581 
max1363_probe(struct i2c_client * client)1582 static int max1363_probe(struct i2c_client *client)
1583 {
1584 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
1585 	int ret;
1586 	struct max1363_state *st;
1587 	struct iio_dev *indio_dev;
1588 	struct regulator *vref;
1589 
1590 	indio_dev = devm_iio_device_alloc(&client->dev,
1591 					  sizeof(struct max1363_state));
1592 	if (!indio_dev)
1593 		return -ENOMEM;
1594 
1595 	st = iio_priv(indio_dev);
1596 
1597 	mutex_init(&st->lock);
1598 	ret = devm_regulator_get_enable(&client->dev, "vcc");
1599 	if (ret)
1600 		return ret;
1601 
1602 	st->chip_info = device_get_match_data(&client->dev);
1603 	if (!st->chip_info)
1604 		st->chip_info = &max1363_chip_info_tbl[id->driver_data];
1605 	st->client = client;
1606 
1607 	st->vref_uv = st->chip_info->int_vref_mv * 1000;
1608 	vref = devm_regulator_get_optional(&client->dev, "vref");
1609 	if (!IS_ERR(vref)) {
1610 		int vref_uv;
1611 
1612 		ret = regulator_enable(vref);
1613 		if (ret)
1614 			return ret;
1615 
1616 		ret = devm_add_action_or_reset(&client->dev, max1363_reg_disable, vref);
1617 		if (ret)
1618 			return ret;
1619 
1620 		st->vref = vref;
1621 		vref_uv = regulator_get_voltage(vref);
1622 		if (vref_uv <= 0)
1623 			return -EINVAL;
1624 
1625 		st->vref_uv = vref_uv;
1626 	}
1627 
1628 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1629 		st->send = i2c_master_send;
1630 		st->recv = i2c_master_recv;
1631 	} else if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)
1632 			&& st->chip_info->bits == 8) {
1633 		st->send = max1363_smbus_send;
1634 		st->recv = max1363_smbus_recv;
1635 	} else {
1636 		return -EOPNOTSUPP;
1637 	}
1638 
1639 	ret = max1363_alloc_scan_masks(indio_dev);
1640 	if (ret)
1641 		return ret;
1642 
1643 	indio_dev->name = id->name;
1644 	indio_dev->channels = st->chip_info->channels;
1645 	indio_dev->num_channels = st->chip_info->num_channels;
1646 	indio_dev->info = st->chip_info->info;
1647 	indio_dev->modes = INDIO_DIRECT_MODE;
1648 	ret = max1363_initial_setup(st);
1649 	if (ret < 0)
1650 		return ret;
1651 
1652 	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
1653 					      &max1363_trigger_handler, NULL);
1654 	if (ret)
1655 		return ret;
1656 
1657 	if (client->irq) {
1658 		ret = devm_request_threaded_irq(&client->dev, st->client->irq,
1659 					   NULL,
1660 					   &max1363_event_handler,
1661 					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1662 					   "max1363_event",
1663 					   indio_dev);
1664 
1665 		if (ret)
1666 			return ret;
1667 	}
1668 
1669 	return devm_iio_device_register(&client->dev, indio_dev);
1670 }
1671 
1672 static const struct i2c_device_id max1363_id[] = {
1673 	{ "max1361", max1361 },
1674 	{ "max1362", max1362 },
1675 	{ "max1363", max1363 },
1676 	{ "max1364", max1364 },
1677 	{ "max1036", max1036 },
1678 	{ "max1037", max1037 },
1679 	{ "max1038", max1038 },
1680 	{ "max1039", max1039 },
1681 	{ "max1136", max1136 },
1682 	{ "max1137", max1137 },
1683 	{ "max1138", max1138 },
1684 	{ "max1139", max1139 },
1685 	{ "max1236", max1236 },
1686 	{ "max1237", max1237 },
1687 	{ "max1238", max1238 },
1688 	{ "max1239", max1239 },
1689 	{ "max11600", max11600 },
1690 	{ "max11601", max11601 },
1691 	{ "max11602", max11602 },
1692 	{ "max11603", max11603 },
1693 	{ "max11604", max11604 },
1694 	{ "max11605", max11605 },
1695 	{ "max11606", max11606 },
1696 	{ "max11607", max11607 },
1697 	{ "max11608", max11608 },
1698 	{ "max11609", max11609 },
1699 	{ "max11610", max11610 },
1700 	{ "max11611", max11611 },
1701 	{ "max11612", max11612 },
1702 	{ "max11613", max11613 },
1703 	{ "max11614", max11614 },
1704 	{ "max11615", max11615 },
1705 	{ "max11616", max11616 },
1706 	{ "max11617", max11617 },
1707 	{ "max11644", max11644 },
1708 	{ "max11645", max11645 },
1709 	{ "max11646", max11646 },
1710 	{ "max11647", max11647 },
1711 	{}
1712 };
1713 
1714 MODULE_DEVICE_TABLE(i2c, max1363_id);
1715 
1716 static struct i2c_driver max1363_driver = {
1717 	.driver = {
1718 		.name = "max1363",
1719 		.of_match_table = max1363_of_match,
1720 	},
1721 	.probe = max1363_probe,
1722 	.id_table = max1363_id,
1723 };
1724 module_i2c_driver(max1363_driver);
1725 
1726 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1727 MODULE_DESCRIPTION("Maxim 1363 ADC");
1728 MODULE_LICENSE("GPL v2");
1729