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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
4 *
5 * based on max1668.c
6 * Copyright (c) 2011 David George <david.george@ska.ac.za>
7 */
8
9#include <linux/bitfield.h>
10#include <linux/bits.h>
11#include <linux/err.h>
12#include <linux/hwmon.h>
13#include <linux/i2c.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/mutex.h>
17#include <linux/of.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20
21enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
22 max6697, max6698, max6699 };
23
24/* Report local sensor as temp1 */
25
26static const u8 MAX6697_REG_TEMP[] = {
27 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
28static const u8 MAX6697_REG_TEMP_EXT[] = {
29 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
30static const u8 MAX6697_REG_MAX[] = {
31 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
32static const u8 MAX6697_REG_CRIT[] = {
33 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
34
35#define MAX6697_REG_MIN 0x30
36/*
37 * Map device tree / internal register bit map to chip bit map.
38 * Applies to alert register and over-temperature register.
39 */
40
41#define MAX6697_EXTERNAL_MASK_DT GENMASK(7, 1)
42#define MAX6697_LOCAL_MASK_DT BIT(0)
43#define MAX6697_EXTERNAL_MASK_CHIP GENMASK(6, 0)
44#define MAX6697_LOCAL_MASK_CHIP BIT(7)
45
46/* alert - local channel is in bit 6 */
47#define MAX6697_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
48 (((reg) & 0x01) << 6) | ((reg) & 0x80))
49
50/* over-temperature - local channel is in bit 7 */
51#define MAX6697_OVERT_MAP_BITS(reg) \
52 (FIELD_PREP(MAX6697_EXTERNAL_MASK_CHIP, FIELD_GET(MAX6697_EXTERNAL_MASK_DT, reg)) | \
53 FIELD_PREP(MAX6697_LOCAL_MASK_CHIP, FIELD_GET(MAX6697_LOCAL_MASK_DT, reg)))
54
55#define MAX6697_REG_STAT_ALARM 0x44
56#define MAX6697_REG_STAT_CRIT 0x45
57#define MAX6697_REG_STAT_FAULT 0x46
58#define MAX6697_REG_STAT_MIN_ALARM 0x47
59
60#define MAX6697_REG_CONFIG 0x41
61#define MAX6581_CONF_EXTENDED BIT(1)
62#define MAX6693_CONF_BETA BIT(2)
63#define MAX6697_CONF_RESISTANCE BIT(3)
64#define MAX6697_CONF_TIMEOUT BIT(5)
65#define MAX6697_REG_ALERT_MASK 0x42
66#define MAX6697_REG_OVERT_MASK 0x43
67
68#define MAX6581_REG_RESISTANCE 0x4a
69#define MAX6581_REG_IDEALITY 0x4b
70#define MAX6581_REG_IDEALITY_SELECT 0x4c
71#define MAX6581_REG_OFFSET 0x4d
72#define MAX6581_REG_OFFSET_SELECT 0x4e
73#define MAX6581_OFFSET_MIN -31750
74#define MAX6581_OFFSET_MAX 31750
75
76#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
77
78struct max6697_chip_data {
79 int channels;
80 u32 have_ext;
81 u32 have_crit;
82 u32 have_fault;
83 u8 valid_conf;
84};
85
86struct max6697_data {
87 struct regmap *regmap;
88
89 enum chips type;
90 const struct max6697_chip_data *chip;
91
92 int temp_offset; /* in degrees C */
93
94 struct mutex update_lock;
95
96#define MAX6697_TEMP_INPUT 0
97#define MAX6697_TEMP_EXT 1
98#define MAX6697_TEMP_MAX 2
99#define MAX6697_TEMP_CRIT 3
100 u32 alarms;
101};
102
103static const struct max6697_chip_data max6697_chip_data[] = {
104 [max6581] = {
105 .channels = 8,
106 .have_crit = 0xff,
107 .have_ext = 0x7f,
108 .have_fault = 0xfe,
109 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
110 },
111 [max6602] = {
112 .channels = 5,
113 .have_crit = 0x12,
114 .have_ext = 0x02,
115 .have_fault = 0x1e,
116 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
117 },
118 [max6622] = {
119 .channels = 5,
120 .have_crit = 0x12,
121 .have_ext = 0x02,
122 .have_fault = 0x1e,
123 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
124 },
125 [max6636] = {
126 .channels = 7,
127 .have_crit = 0x72,
128 .have_ext = 0x02,
129 .have_fault = 0x7e,
130 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
131 },
132 [max6689] = {
133 .channels = 7,
134 .have_crit = 0x72,
135 .have_ext = 0x02,
136 .have_fault = 0x7e,
137 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
138 },
139 [max6693] = {
140 .channels = 7,
141 .have_crit = 0x72,
142 .have_ext = 0x02,
143 .have_fault = 0x7e,
144 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
145 MAX6697_CONF_TIMEOUT,
146 },
147 [max6694] = {
148 .channels = 5,
149 .have_crit = 0x12,
150 .have_ext = 0x02,
151 .have_fault = 0x1e,
152 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
153 MAX6697_CONF_TIMEOUT,
154 },
155 [max6697] = {
156 .channels = 7,
157 .have_crit = 0x72,
158 .have_ext = 0x02,
159 .have_fault = 0x7e,
160 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
161 },
162 [max6698] = {
163 .channels = 7,
164 .have_crit = 0x72,
165 .have_ext = 0x02,
166 .have_fault = 0x0e,
167 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
168 },
169 [max6699] = {
170 .channels = 5,
171 .have_crit = 0x12,
172 .have_ext = 0x02,
173 .have_fault = 0x1e,
174 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
175 },
176};
177
178static int max6697_alarm_channel_map(int channel)
179{
180 switch (channel) {
181 case 0:
182 return 6;
183 case 7:
184 return 7;
185 default:
186 return channel - 1;
187 }
188}
189
190static int max6697_read(struct device *dev, enum hwmon_sensor_types type,
191 u32 attr, int channel, long *val)
192{
193 unsigned int offset_regs[2] = { MAX6581_REG_OFFSET_SELECT, MAX6581_REG_OFFSET };
194 unsigned int temp_regs[2] = { MAX6697_REG_TEMP[channel],
195 MAX6697_REG_TEMP_EXT[channel] };
196 struct max6697_data *data = dev_get_drvdata(dev);
197 struct regmap *regmap = data->regmap;
198 u8 regdata[2] = { };
199 u32 regval;
200 int ret;
201
202 switch (attr) {
203 case hwmon_temp_input:
204 ret = regmap_multi_reg_read(regmap, temp_regs, regdata,
205 data->chip->have_ext & BIT(channel) ? 2 : 1);
206 if (ret)
207 return ret;
208 *val = (((regdata[0] - data->temp_offset) << 3) | (regdata[1] >> 5)) * 125;
209 break;
210 case hwmon_temp_max:
211 ret = regmap_read(regmap, MAX6697_REG_MAX[channel], ®val);
212 if (ret)
213 return ret;
214 *val = ((int)regval - data->temp_offset) * 1000;
215 break;
216 case hwmon_temp_crit:
217 ret = regmap_read(regmap, MAX6697_REG_CRIT[channel], ®val);
218 if (ret)
219 return ret;
220 *val = ((int)regval - data->temp_offset) * 1000;
221 break;
222 case hwmon_temp_min:
223 ret = regmap_read(regmap, MAX6697_REG_MIN, ®val);
224 if (ret)
225 return ret;
226 *val = ((int)regval - data->temp_offset) * 1000;
227 break;
228 case hwmon_temp_offset:
229 ret = regmap_multi_reg_read(regmap, offset_regs, regdata, 2);
230 if (ret)
231 return ret;
232
233 if (!(regdata[0] & BIT(channel - 1)))
234 regdata[1] = 0;
235
236 *val = sign_extend32(regdata[1], 7) * 250;
237 break;
238 case hwmon_temp_fault:
239 ret = regmap_read(regmap, MAX6697_REG_STAT_FAULT, ®val);
240 if (ret)
241 return ret;
242 if (data->type == max6581)
243 *val = !!(regval & BIT(channel - 1));
244 else
245 *val = !!(regval & BIT(channel));
246 break;
247 case hwmon_temp_crit_alarm:
248 ret = regmap_read(regmap, MAX6697_REG_STAT_CRIT, ®val);
249 if (ret)
250 return ret;
251 /*
252 * In the MAX6581 datasheet revision 0 to 3, the local channel
253 * overtemperature status is reported in bit 6 of register 0x45,
254 * and the overtemperature status for remote channel 7 is
255 * reported in bit 7. In Revision 4 and later, the local channel
256 * overtemperature status is reported in bit 7, and the remote
257 * channel 7 overtemperature status is reported in bit 6. A real
258 * chip was found to match the functionality documented in
259 * Revision 4 and later.
260 */
261 *val = !!(regval & BIT(channel ? channel - 1 : 7));
262 break;
263 case hwmon_temp_max_alarm:
264 ret = regmap_read(regmap, MAX6697_REG_STAT_ALARM, ®val);
265 if (ret)
266 return ret;
267 *val = !!(regval & BIT(max6697_alarm_channel_map(channel)));
268 break;
269 case hwmon_temp_min_alarm:
270 ret = regmap_read(regmap, MAX6697_REG_STAT_MIN_ALARM, ®val);
271 if (ret)
272 return ret;
273 *val = !!(regval & BIT(max6697_alarm_channel_map(channel)));
274 break;
275 default:
276 return -EOPNOTSUPP;
277 }
278 return 0;
279}
280
281static int max6697_write(struct device *dev, enum hwmon_sensor_types type,
282 u32 attr, int channel, long val)
283{
284 struct max6697_data *data = dev_get_drvdata(dev);
285 struct regmap *regmap = data->regmap;
286 int ret;
287
288 switch (attr) {
289 case hwmon_temp_max:
290 val = clamp_val(val, -1000000, 1000000); /* prevent underflow */
291 val = DIV_ROUND_CLOSEST(val, 1000) + data->temp_offset;
292 val = clamp_val(val, 0, data->type == max6581 ? 255 : 127);
293 return regmap_write(regmap, MAX6697_REG_MAX[channel], val);
294 case hwmon_temp_crit:
295 val = clamp_val(val, -1000000, 1000000); /* prevent underflow */
296 val = DIV_ROUND_CLOSEST(val, 1000) + data->temp_offset;
297 val = clamp_val(val, 0, data->type == max6581 ? 255 : 127);
298 return regmap_write(regmap, MAX6697_REG_CRIT[channel], val);
299 case hwmon_temp_min:
300 val = clamp_val(val, -1000000, 1000000); /* prevent underflow */
301 val = DIV_ROUND_CLOSEST(val, 1000) + data->temp_offset;
302 val = clamp_val(val, 0, 255);
303 return regmap_write(regmap, MAX6697_REG_MIN, val);
304 case hwmon_temp_offset:
305 mutex_lock(&data->update_lock);
306 val = clamp_val(val, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
307 val = DIV_ROUND_CLOSEST(val, 250);
308 if (!val) { /* disable this (and only this) channel */
309 ret = regmap_clear_bits(regmap, MAX6581_REG_OFFSET_SELECT,
310 BIT(channel - 1));
311 } else {
312 /* enable channel and update offset */
313 ret = regmap_set_bits(regmap, MAX6581_REG_OFFSET_SELECT,
314 BIT(channel - 1));
315 if (ret)
316 goto unlock;
317 ret = regmap_write(regmap, MAX6581_REG_OFFSET, val);
318 }
319unlock:
320 mutex_unlock(&data->update_lock);
321 return ret;
322 default:
323 return -EOPNOTSUPP;
324 }
325}
326
327static umode_t max6697_is_visible(const void *_data, enum hwmon_sensor_types type,
328 u32 attr, int channel)
329{
330 const struct max6697_data *data = _data;
331 const struct max6697_chip_data *chip = data->chip;
332
333 if (channel >= chip->channels)
334 return 0;
335
336 switch (attr) {
337 case hwmon_temp_max:
338 return 0644;
339 case hwmon_temp_input:
340 case hwmon_temp_max_alarm:
341 return 0444;
342 case hwmon_temp_min:
343 if (data->type == max6581)
344 return channel ? 0444 : 0644;
345 break;
346 case hwmon_temp_min_alarm:
347 if (data->type == max6581)
348 return 0444;
349 break;
350 case hwmon_temp_crit:
351 if (chip->have_crit & BIT(channel))
352 return 0644;
353 break;
354 case hwmon_temp_crit_alarm:
355 if (chip->have_crit & BIT(channel))
356 return 0444;
357 break;
358 case hwmon_temp_fault:
359 if (chip->have_fault & BIT(channel))
360 return 0444;
361 break;
362 case hwmon_temp_offset:
363 if (data->type == max6581 && channel)
364 return 0644;
365 break;
366 default:
367 break;
368 }
369 return 0;
370}
371
372/* Return 0 if detection is successful, -ENODEV otherwise */
373static const struct hwmon_channel_info * const max6697_info[] = {
374 HWMON_CHANNEL_INFO(temp,
375 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
376 HWMON_T_MIN | HWMON_T_MIN_ALARM |
377 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
378 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
379 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
380 HWMON_T_MIN | HWMON_T_MIN_ALARM |
381 HWMON_T_FAULT | HWMON_T_OFFSET,
382 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
383 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
384 HWMON_T_MIN | HWMON_T_MIN_ALARM |
385 HWMON_T_FAULT | HWMON_T_OFFSET,
386 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
387 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
388 HWMON_T_MIN | HWMON_T_MIN_ALARM |
389 HWMON_T_FAULT | HWMON_T_OFFSET,
390 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
391 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
392 HWMON_T_MIN | HWMON_T_MIN_ALARM |
393 HWMON_T_FAULT | HWMON_T_OFFSET,
394 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
395 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
396 HWMON_T_MIN | HWMON_T_MIN_ALARM |
397 HWMON_T_FAULT | HWMON_T_OFFSET,
398 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
399 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
400 HWMON_T_MIN | HWMON_T_MIN_ALARM |
401 HWMON_T_FAULT | HWMON_T_OFFSET,
402 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
403 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
404 HWMON_T_MIN | HWMON_T_MIN_ALARM |
405 HWMON_T_FAULT | HWMON_T_OFFSET),
406 NULL
407};
408
409static const struct hwmon_ops max6697_hwmon_ops = {
410 .is_visible = max6697_is_visible,
411 .read = max6697_read,
412 .write = max6697_write,
413};
414
415static const struct hwmon_chip_info max6697_chip_info = {
416 .ops = &max6697_hwmon_ops,
417 .info = max6697_info,
418};
419
420static int max6697_config_of(struct device_node *node, struct max6697_data *data)
421{
422 const struct max6697_chip_data *chip = data->chip;
423 struct regmap *regmap = data->regmap;
424 int ret, confreg;
425 u32 vals[2];
426
427 confreg = 0;
428 if (of_property_read_bool(node, "smbus-timeout-disable") &&
429 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
430 confreg |= MAX6697_CONF_TIMEOUT;
431 }
432 if (of_property_read_bool(node, "extended-range-enable") &&
433 (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
434 confreg |= MAX6581_CONF_EXTENDED;
435 data->temp_offset = 64;
436 }
437 if (of_property_read_bool(node, "beta-compensation-enable") &&
438 (chip->valid_conf & MAX6693_CONF_BETA)) {
439 confreg |= MAX6693_CONF_BETA;
440 }
441
442 if (of_property_read_u32(node, "alert-mask", vals))
443 vals[0] = 0;
444 ret = regmap_write(regmap, MAX6697_REG_ALERT_MASK,
445 MAX6697_ALERT_MAP_BITS(vals[0]));
446 if (ret)
447 return ret;
448
449 if (of_property_read_u32(node, "over-temperature-mask", vals))
450 vals[0] = 0;
451 ret = regmap_write(regmap, MAX6697_REG_OVERT_MASK,
452 MAX6697_OVERT_MAP_BITS(vals[0]));
453 if (ret)
454 return ret;
455
456 if (data->type != max6581) {
457 if (of_property_read_bool(node, "resistance-cancellation") &&
458 chip->valid_conf & MAX6697_CONF_RESISTANCE) {
459 confreg |= MAX6697_CONF_RESISTANCE;
460 }
461 } else {
462 if (of_property_read_u32(node, "resistance-cancellation", &vals[0])) {
463 if (of_property_read_bool(node, "resistance-cancellation"))
464 vals[0] = 0xfe;
465 else
466 vals[0] = 0;
467 }
468
469 vals[0] &= 0xfe;
470 ret = regmap_write(regmap, MAX6581_REG_RESISTANCE, vals[0] >> 1);
471 if (ret < 0)
472 return ret;
473
474 if (of_property_read_u32_array(node, "transistor-ideality", vals, 2)) {
475 vals[0] = 0;
476 vals[1] = 0;
477 }
478
479 ret = regmap_write(regmap, MAX6581_REG_IDEALITY, vals[1]);
480 if (ret < 0)
481 return ret;
482 ret = regmap_write(regmap, MAX6581_REG_IDEALITY_SELECT,
483 (vals[0] & 0xfe) >> 1);
484 if (ret < 0)
485 return ret;
486 }
487 return regmap_write(regmap, MAX6697_REG_CONFIG, confreg);
488}
489
490static int max6697_init_chip(struct device_node *np, struct max6697_data *data)
491{
492 unsigned int reg;
493 int ret;
494
495 /*
496 * Don't touch configuration if there is no devicetree configuration.
497 * If that is the case, use the current chip configuration.
498 */
499 if (!np) {
500 struct regmap *regmap = data->regmap;
501
502 ret = regmap_read(regmap, MAX6697_REG_CONFIG, ®);
503 if (ret < 0)
504 return ret;
505 if (data->type == max6581) {
506 if (reg & MAX6581_CONF_EXTENDED)
507 data->temp_offset = 64;
508 ret = regmap_read(regmap, MAX6581_REG_RESISTANCE, ®);
509 }
510 } else {
511 ret = max6697_config_of(np, data);
512 }
513
514 return ret;
515}
516
517static bool max6697_volatile_reg(struct device *dev, unsigned int reg)
518{
519 switch (reg) {
520 case 0x00 ... 0x09: /* temperature high bytes */
521 case 0x44 ... 0x47: /* status */
522 case 0x51 ... 0x58: /* temperature low bytes */
523 return true;
524 default:
525 return false;
526 }
527}
528
529static bool max6697_writeable_reg(struct device *dev, unsigned int reg)
530{
531 return reg != 0x0a && reg != 0x0f && !max6697_volatile_reg(dev, reg);
532}
533
534static const struct regmap_config max6697_regmap_config = {
535 .reg_bits = 8,
536 .val_bits = 8,
537 .max_register = 0x58,
538 .writeable_reg = max6697_writeable_reg,
539 .volatile_reg = max6697_volatile_reg,
540 .cache_type = REGCACHE_MAPLE,
541};
542
543static int max6697_probe(struct i2c_client *client)
544{
545 struct device *dev = &client->dev;
546 struct max6697_data *data;
547 struct device *hwmon_dev;
548 struct regmap *regmap;
549 int err;
550
551 regmap = regmap_init_i2c(client, &max6697_regmap_config);
552 if (IS_ERR(regmap))
553 return PTR_ERR(regmap);
554
555 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
556 if (!data)
557 return -ENOMEM;
558
559 data->regmap = regmap;
560 data->type = (uintptr_t)i2c_get_match_data(client);
561 data->chip = &max6697_chip_data[data->type];
562 mutex_init(&data->update_lock);
563
564 err = max6697_init_chip(client->dev.of_node, data);
565 if (err)
566 return err;
567
568 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
569 &max6697_chip_info, NULL);
570 return PTR_ERR_OR_ZERO(hwmon_dev);
571}
572
573static const struct i2c_device_id max6697_id[] = {
574 { "max6581", max6581 },
575 { "max6602", max6602 },
576 { "max6622", max6622 },
577 { "max6636", max6636 },
578 { "max6689", max6689 },
579 { "max6693", max6693 },
580 { "max6694", max6694 },
581 { "max6697", max6697 },
582 { "max6698", max6698 },
583 { "max6699", max6699 },
584 { }
585};
586MODULE_DEVICE_TABLE(i2c, max6697_id);
587
588static const struct of_device_id __maybe_unused max6697_of_match[] = {
589 {
590 .compatible = "maxim,max6581",
591 .data = (void *)max6581
592 },
593 {
594 .compatible = "maxim,max6602",
595 .data = (void *)max6602
596 },
597 {
598 .compatible = "maxim,max6622",
599 .data = (void *)max6622
600 },
601 {
602 .compatible = "maxim,max6636",
603 .data = (void *)max6636
604 },
605 {
606 .compatible = "maxim,max6689",
607 .data = (void *)max6689
608 },
609 {
610 .compatible = "maxim,max6693",
611 .data = (void *)max6693
612 },
613 {
614 .compatible = "maxim,max6694",
615 .data = (void *)max6694
616 },
617 {
618 .compatible = "maxim,max6697",
619 .data = (void *)max6697
620 },
621 {
622 .compatible = "maxim,max6698",
623 .data = (void *)max6698
624 },
625 {
626 .compatible = "maxim,max6699",
627 .data = (void *)max6699
628 },
629 { },
630};
631MODULE_DEVICE_TABLE(of, max6697_of_match);
632
633static struct i2c_driver max6697_driver = {
634 .driver = {
635 .name = "max6697",
636 .of_match_table = of_match_ptr(max6697_of_match),
637 },
638 .probe = max6697_probe,
639 .id_table = max6697_id,
640};
641
642module_i2c_driver(max6697_driver);
643
644MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
645MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
646MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
4 *
5 * based on max1668.c
6 * Copyright (c) 2011 David George <david.george@ska.ac.za>
7 */
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/slab.h>
12#include <linux/jiffies.h>
13#include <linux/i2c.h>
14#include <linux/hwmon.h>
15#include <linux/hwmon-sysfs.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18#include <linux/of.h>
19
20#include <linux/platform_data/max6697.h>
21
22enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
23 max6697, max6698, max6699 };
24
25/* Report local sensor as temp1 */
26
27static const u8 MAX6697_REG_TEMP[] = {
28 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
29static const u8 MAX6697_REG_TEMP_EXT[] = {
30 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
31static const u8 MAX6697_REG_MAX[] = {
32 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
33static const u8 MAX6697_REG_CRIT[] = {
34 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
35
36/*
37 * Map device tree / platform data register bit map to chip bit map.
38 * Applies to alert register and over-temperature register.
39 */
40#define MAX6697_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
41 (((reg) & 0x01) << 6) | ((reg) & 0x80))
42#define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
43
44#define MAX6697_REG_STAT(n) (0x44 + (n))
45
46#define MAX6697_REG_CONFIG 0x41
47#define MAX6581_CONF_EXTENDED (1 << 1)
48#define MAX6693_CONF_BETA (1 << 2)
49#define MAX6697_CONF_RESISTANCE (1 << 3)
50#define MAX6697_CONF_TIMEOUT (1 << 5)
51#define MAX6697_REG_ALERT_MASK 0x42
52#define MAX6697_REG_OVERT_MASK 0x43
53
54#define MAX6581_REG_RESISTANCE 0x4a
55#define MAX6581_REG_IDEALITY 0x4b
56#define MAX6581_REG_IDEALITY_SELECT 0x4c
57#define MAX6581_REG_OFFSET 0x4d
58#define MAX6581_REG_OFFSET_SELECT 0x4e
59#define MAX6581_OFFSET_MIN -31750
60#define MAX6581_OFFSET_MAX 31750
61
62#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
63
64struct max6697_chip_data {
65 int channels;
66 u32 have_ext;
67 u32 have_crit;
68 u32 have_fault;
69 u8 valid_conf;
70 const u8 *alarm_map;
71};
72
73struct max6697_data {
74 struct i2c_client *client;
75
76 enum chips type;
77 const struct max6697_chip_data *chip;
78
79 int update_interval; /* in milli-seconds */
80 int temp_offset; /* in degrees C */
81
82 struct mutex update_lock;
83 unsigned long last_updated; /* In jiffies */
84 bool valid; /* true if following fields are valid */
85
86 /* 1x local and up to 7x remote */
87 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
88#define MAX6697_TEMP_INPUT 0
89#define MAX6697_TEMP_EXT 1
90#define MAX6697_TEMP_MAX 2
91#define MAX6697_TEMP_CRIT 3
92 u32 alarms;
93};
94
95/* Diode fault status bits on MAX6581 are right shifted by one bit */
96static const u8 max6581_alarm_map[] = {
97 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
98 16, 17, 18, 19, 20, 21, 22, 23 };
99
100static const struct max6697_chip_data max6697_chip_data[] = {
101 [max6581] = {
102 .channels = 8,
103 .have_crit = 0xff,
104 .have_ext = 0x7f,
105 .have_fault = 0xfe,
106 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
107 .alarm_map = max6581_alarm_map,
108 },
109 [max6602] = {
110 .channels = 5,
111 .have_crit = 0x12,
112 .have_ext = 0x02,
113 .have_fault = 0x1e,
114 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
115 },
116 [max6622] = {
117 .channels = 5,
118 .have_crit = 0x12,
119 .have_ext = 0x02,
120 .have_fault = 0x1e,
121 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
122 },
123 [max6636] = {
124 .channels = 7,
125 .have_crit = 0x72,
126 .have_ext = 0x02,
127 .have_fault = 0x7e,
128 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
129 },
130 [max6689] = {
131 .channels = 7,
132 .have_crit = 0x72,
133 .have_ext = 0x02,
134 .have_fault = 0x7e,
135 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
136 },
137 [max6693] = {
138 .channels = 7,
139 .have_crit = 0x72,
140 .have_ext = 0x02,
141 .have_fault = 0x7e,
142 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
143 MAX6697_CONF_TIMEOUT,
144 },
145 [max6694] = {
146 .channels = 5,
147 .have_crit = 0x12,
148 .have_ext = 0x02,
149 .have_fault = 0x1e,
150 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
151 MAX6697_CONF_TIMEOUT,
152 },
153 [max6697] = {
154 .channels = 7,
155 .have_crit = 0x72,
156 .have_ext = 0x02,
157 .have_fault = 0x7e,
158 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
159 },
160 [max6698] = {
161 .channels = 7,
162 .have_crit = 0x72,
163 .have_ext = 0x02,
164 .have_fault = 0x0e,
165 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
166 },
167 [max6699] = {
168 .channels = 5,
169 .have_crit = 0x12,
170 .have_ext = 0x02,
171 .have_fault = 0x1e,
172 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
173 },
174};
175
176static inline int max6581_offset_to_millic(int val)
177{
178 return sign_extend32(val, 7) * 250;
179}
180
181static struct max6697_data *max6697_update_device(struct device *dev)
182{
183 struct max6697_data *data = dev_get_drvdata(dev);
184 struct i2c_client *client = data->client;
185 struct max6697_data *ret = data;
186 int val;
187 int i;
188 u32 alarms;
189
190 mutex_lock(&data->update_lock);
191
192 if (data->valid &&
193 !time_after(jiffies, data->last_updated
194 + msecs_to_jiffies(data->update_interval)))
195 goto abort;
196
197 for (i = 0; i < data->chip->channels; i++) {
198 if (data->chip->have_ext & (1 << i)) {
199 val = i2c_smbus_read_byte_data(client,
200 MAX6697_REG_TEMP_EXT[i]);
201 if (unlikely(val < 0)) {
202 ret = ERR_PTR(val);
203 goto abort;
204 }
205 data->temp[i][MAX6697_TEMP_EXT] = val;
206 }
207
208 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
209 if (unlikely(val < 0)) {
210 ret = ERR_PTR(val);
211 goto abort;
212 }
213 data->temp[i][MAX6697_TEMP_INPUT] = val;
214
215 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
216 if (unlikely(val < 0)) {
217 ret = ERR_PTR(val);
218 goto abort;
219 }
220 data->temp[i][MAX6697_TEMP_MAX] = val;
221
222 if (data->chip->have_crit & (1 << i)) {
223 val = i2c_smbus_read_byte_data(client,
224 MAX6697_REG_CRIT[i]);
225 if (unlikely(val < 0)) {
226 ret = ERR_PTR(val);
227 goto abort;
228 }
229 data->temp[i][MAX6697_TEMP_CRIT] = val;
230 }
231 }
232
233 alarms = 0;
234 for (i = 0; i < 3; i++) {
235 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
236 if (unlikely(val < 0)) {
237 ret = ERR_PTR(val);
238 goto abort;
239 }
240 alarms = (alarms << 8) | val;
241 }
242 data->alarms = alarms;
243 data->last_updated = jiffies;
244 data->valid = true;
245abort:
246 mutex_unlock(&data->update_lock);
247
248 return ret;
249}
250
251static ssize_t temp_input_show(struct device *dev,
252 struct device_attribute *devattr, char *buf)
253{
254 int index = to_sensor_dev_attr(devattr)->index;
255 struct max6697_data *data = max6697_update_device(dev);
256 int temp;
257
258 if (IS_ERR(data))
259 return PTR_ERR(data);
260
261 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
262 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
263
264 return sprintf(buf, "%d\n", temp * 125);
265}
266
267static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
268 char *buf)
269{
270 int nr = to_sensor_dev_attr_2(devattr)->nr;
271 int index = to_sensor_dev_attr_2(devattr)->index;
272 struct max6697_data *data = max6697_update_device(dev);
273 int temp;
274
275 if (IS_ERR(data))
276 return PTR_ERR(data);
277
278 temp = data->temp[nr][index];
279 temp -= data->temp_offset;
280
281 return sprintf(buf, "%d\n", temp * 1000);
282}
283
284static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
285 char *buf)
286{
287 int index = to_sensor_dev_attr(attr)->index;
288 struct max6697_data *data = max6697_update_device(dev);
289
290 if (IS_ERR(data))
291 return PTR_ERR(data);
292
293 if (data->chip->alarm_map)
294 index = data->chip->alarm_map[index];
295
296 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
297}
298
299static ssize_t temp_store(struct device *dev,
300 struct device_attribute *devattr, const char *buf,
301 size_t count)
302{
303 int nr = to_sensor_dev_attr_2(devattr)->nr;
304 int index = to_sensor_dev_attr_2(devattr)->index;
305 struct max6697_data *data = dev_get_drvdata(dev);
306 long temp;
307 int ret;
308
309 ret = kstrtol(buf, 10, &temp);
310 if (ret < 0)
311 return ret;
312
313 mutex_lock(&data->update_lock);
314 temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
315 temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
316 data->temp[nr][index] = temp;
317 ret = i2c_smbus_write_byte_data(data->client,
318 index == 2 ? MAX6697_REG_MAX[nr]
319 : MAX6697_REG_CRIT[nr],
320 temp);
321 mutex_unlock(&data->update_lock);
322
323 return ret < 0 ? ret : count;
324}
325
326static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
327 size_t count)
328{
329 int val, ret, index, select;
330 struct max6697_data *data;
331 bool channel_enabled;
332 long temp;
333
334 index = to_sensor_dev_attr(devattr)->index;
335 data = dev_get_drvdata(dev);
336 ret = kstrtol(buf, 10, &temp);
337 if (ret < 0)
338 return ret;
339
340 mutex_lock(&data->update_lock);
341 select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
342 if (select < 0) {
343 ret = select;
344 goto abort;
345 }
346 channel_enabled = (select & (1 << (index - 1)));
347 temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
348 val = DIV_ROUND_CLOSEST(temp, 250);
349 /* disable the offset for channel if the new offset is 0 */
350 if (val == 0) {
351 if (channel_enabled)
352 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
353 select & ~(1 << (index - 1)));
354 ret = ret < 0 ? ret : count;
355 goto abort;
356 }
357 if (!channel_enabled) {
358 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
359 select | (1 << (index - 1)));
360 if (ret < 0)
361 goto abort;
362 }
363 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
364 ret = ret < 0 ? ret : count;
365
366abort:
367 mutex_unlock(&data->update_lock);
368 return ret;
369}
370
371static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
372{
373 struct max6697_data *data;
374 int select, ret, index;
375
376 index = to_sensor_dev_attr(devattr)->index;
377 data = dev_get_drvdata(dev);
378 mutex_lock(&data->update_lock);
379 select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
380 if (select < 0)
381 ret = select;
382 else if (select & (1 << (index - 1)))
383 ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
384 else
385 ret = 0;
386 mutex_unlock(&data->update_lock);
387 return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
388}
389
390static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
391static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
392static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
393
394static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
395static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
396static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
397
398static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
399static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
400static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
401
402static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
403static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
404static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
405
406static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
407static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
408static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
409
410static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
411static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
412static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
413
414static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
415static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
416static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
417
418static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
419static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
420static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
421
422static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
423static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
424static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
425static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
426static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
427static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
428static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
429static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
430
431static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
432static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
433static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
434static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
435static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
436static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
437static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
438static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
439
440static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
441static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
442static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
443static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
444static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
445static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
446static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
447
448/* There is no offset for local temperature so starting from temp2 */
449static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
450static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
451static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
452static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
453static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
454static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
455static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
456
457static DEVICE_ATTR(dummy, 0, NULL, NULL);
458
459static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
460 int index)
461{
462 struct device *dev = kobj_to_dev(kobj);
463 struct max6697_data *data = dev_get_drvdata(dev);
464 const struct max6697_chip_data *chip = data->chip;
465 int channel = index / 7; /* channel number */
466 int nr = index % 7; /* attribute index within channel */
467
468 if (channel >= chip->channels)
469 return 0;
470
471 if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
472 return 0;
473 if (nr == 5 && !(chip->have_fault & (1 << channel)))
474 return 0;
475 /* offset reg is only supported on max6581 remote channels */
476 if (nr == 6)
477 if (data->type != max6581 || channel == 0)
478 return 0;
479
480 return attr->mode;
481}
482
483/*
484 * max6697_is_visible uses the index into the following array to determine
485 * if attributes should be created or not. Any change in order or content
486 * must be matched in max6697_is_visible.
487 */
488static struct attribute *max6697_attributes[] = {
489 &sensor_dev_attr_temp1_input.dev_attr.attr,
490 &sensor_dev_attr_temp1_max.dev_attr.attr,
491 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
492 &sensor_dev_attr_temp1_crit.dev_attr.attr,
493 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
494 &dev_attr_dummy.attr,
495 &dev_attr_dummy.attr,
496
497 &sensor_dev_attr_temp2_input.dev_attr.attr,
498 &sensor_dev_attr_temp2_max.dev_attr.attr,
499 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
500 &sensor_dev_attr_temp2_crit.dev_attr.attr,
501 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
502 &sensor_dev_attr_temp2_fault.dev_attr.attr,
503 &sensor_dev_attr_temp2_offset.dev_attr.attr,
504
505 &sensor_dev_attr_temp3_input.dev_attr.attr,
506 &sensor_dev_attr_temp3_max.dev_attr.attr,
507 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
508 &sensor_dev_attr_temp3_crit.dev_attr.attr,
509 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
510 &sensor_dev_attr_temp3_fault.dev_attr.attr,
511 &sensor_dev_attr_temp3_offset.dev_attr.attr,
512
513 &sensor_dev_attr_temp4_input.dev_attr.attr,
514 &sensor_dev_attr_temp4_max.dev_attr.attr,
515 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
516 &sensor_dev_attr_temp4_crit.dev_attr.attr,
517 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
518 &sensor_dev_attr_temp4_fault.dev_attr.attr,
519 &sensor_dev_attr_temp4_offset.dev_attr.attr,
520
521 &sensor_dev_attr_temp5_input.dev_attr.attr,
522 &sensor_dev_attr_temp5_max.dev_attr.attr,
523 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
524 &sensor_dev_attr_temp5_crit.dev_attr.attr,
525 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
526 &sensor_dev_attr_temp5_fault.dev_attr.attr,
527 &sensor_dev_attr_temp5_offset.dev_attr.attr,
528
529 &sensor_dev_attr_temp6_input.dev_attr.attr,
530 &sensor_dev_attr_temp6_max.dev_attr.attr,
531 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
532 &sensor_dev_attr_temp6_crit.dev_attr.attr,
533 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
534 &sensor_dev_attr_temp6_fault.dev_attr.attr,
535 &sensor_dev_attr_temp6_offset.dev_attr.attr,
536
537 &sensor_dev_attr_temp7_input.dev_attr.attr,
538 &sensor_dev_attr_temp7_max.dev_attr.attr,
539 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
540 &sensor_dev_attr_temp7_crit.dev_attr.attr,
541 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
542 &sensor_dev_attr_temp7_fault.dev_attr.attr,
543 &sensor_dev_attr_temp7_offset.dev_attr.attr,
544
545 &sensor_dev_attr_temp8_input.dev_attr.attr,
546 &sensor_dev_attr_temp8_max.dev_attr.attr,
547 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
548 &sensor_dev_attr_temp8_crit.dev_attr.attr,
549 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
550 &sensor_dev_attr_temp8_fault.dev_attr.attr,
551 &sensor_dev_attr_temp8_offset.dev_attr.attr,
552 NULL
553};
554
555static const struct attribute_group max6697_group = {
556 .attrs = max6697_attributes, .is_visible = max6697_is_visible,
557};
558__ATTRIBUTE_GROUPS(max6697);
559
560static void max6697_get_config_of(struct device_node *node,
561 struct max6697_platform_data *pdata)
562{
563 int len;
564 const __be32 *prop;
565
566 pdata->smbus_timeout_disable =
567 of_property_read_bool(node, "smbus-timeout-disable");
568 pdata->extended_range_enable =
569 of_property_read_bool(node, "extended-range-enable");
570 pdata->beta_compensation =
571 of_property_read_bool(node, "beta-compensation-enable");
572
573 prop = of_get_property(node, "alert-mask", &len);
574 if (prop && len == sizeof(u32))
575 pdata->alert_mask = be32_to_cpu(prop[0]);
576 prop = of_get_property(node, "over-temperature-mask", &len);
577 if (prop && len == sizeof(u32))
578 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
579 prop = of_get_property(node, "resistance-cancellation", &len);
580 if (prop) {
581 if (len == sizeof(u32))
582 pdata->resistance_cancellation = be32_to_cpu(prop[0]);
583 else
584 pdata->resistance_cancellation = 0xfe;
585 }
586 prop = of_get_property(node, "transistor-ideality", &len);
587 if (prop && len == 2 * sizeof(u32)) {
588 pdata->ideality_mask = be32_to_cpu(prop[0]);
589 pdata->ideality_value = be32_to_cpu(prop[1]);
590 }
591}
592
593static int max6697_init_chip(struct max6697_data *data,
594 struct i2c_client *client)
595{
596 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
597 struct max6697_platform_data p;
598 const struct max6697_chip_data *chip = data->chip;
599 int factor = chip->channels;
600 int ret, reg;
601
602 /*
603 * Don't touch configuration if neither platform data nor OF
604 * configuration was specified. If that is the case, use the
605 * current chip configuration.
606 */
607 if (!pdata && !client->dev.of_node) {
608 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
609 if (reg < 0)
610 return reg;
611 if (data->type == max6581) {
612 if (reg & MAX6581_CONF_EXTENDED)
613 data->temp_offset = 64;
614 reg = i2c_smbus_read_byte_data(client,
615 MAX6581_REG_RESISTANCE);
616 if (reg < 0)
617 return reg;
618 factor += hweight8(reg);
619 } else {
620 if (reg & MAX6697_CONF_RESISTANCE)
621 factor++;
622 }
623 goto done;
624 }
625
626 if (client->dev.of_node) {
627 memset(&p, 0, sizeof(p));
628 max6697_get_config_of(client->dev.of_node, &p);
629 pdata = &p;
630 }
631
632 reg = 0;
633 if (pdata->smbus_timeout_disable &&
634 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
635 reg |= MAX6697_CONF_TIMEOUT;
636 }
637 if (pdata->extended_range_enable &&
638 (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
639 reg |= MAX6581_CONF_EXTENDED;
640 data->temp_offset = 64;
641 }
642 if (pdata->resistance_cancellation &&
643 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
644 reg |= MAX6697_CONF_RESISTANCE;
645 factor++;
646 }
647 if (pdata->beta_compensation &&
648 (chip->valid_conf & MAX6693_CONF_BETA)) {
649 reg |= MAX6693_CONF_BETA;
650 }
651
652 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
653 if (ret < 0)
654 return ret;
655
656 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
657 MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
658 if (ret < 0)
659 return ret;
660
661 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
662 MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
663 if (ret < 0)
664 return ret;
665
666 if (data->type == max6581) {
667 factor += hweight8(pdata->resistance_cancellation >> 1);
668 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
669 pdata->resistance_cancellation >> 1);
670 if (ret < 0)
671 return ret;
672 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
673 pdata->ideality_value);
674 if (ret < 0)
675 return ret;
676 ret = i2c_smbus_write_byte_data(client,
677 MAX6581_REG_IDEALITY_SELECT,
678 pdata->ideality_mask >> 1);
679 if (ret < 0)
680 return ret;
681 }
682done:
683 data->update_interval = factor * MAX6697_CONV_TIME;
684 return 0;
685}
686
687static const struct i2c_device_id max6697_id[];
688
689static int max6697_probe(struct i2c_client *client)
690{
691 struct i2c_adapter *adapter = client->adapter;
692 struct device *dev = &client->dev;
693 struct max6697_data *data;
694 struct device *hwmon_dev;
695 int err;
696
697 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
698 return -ENODEV;
699
700 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
701 if (!data)
702 return -ENOMEM;
703
704 if (client->dev.of_node)
705 data->type = (uintptr_t)of_device_get_match_data(&client->dev);
706 else
707 data->type = i2c_match_id(max6697_id, client)->driver_data;
708 data->chip = &max6697_chip_data[data->type];
709 data->client = client;
710 mutex_init(&data->update_lock);
711
712 err = max6697_init_chip(data, client);
713 if (err)
714 return err;
715
716 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
717 data,
718 max6697_groups);
719 return PTR_ERR_OR_ZERO(hwmon_dev);
720}
721
722static const struct i2c_device_id max6697_id[] = {
723 { "max6581", max6581 },
724 { "max6602", max6602 },
725 { "max6622", max6622 },
726 { "max6636", max6636 },
727 { "max6689", max6689 },
728 { "max6693", max6693 },
729 { "max6694", max6694 },
730 { "max6697", max6697 },
731 { "max6698", max6698 },
732 { "max6699", max6699 },
733 { }
734};
735MODULE_DEVICE_TABLE(i2c, max6697_id);
736
737static const struct of_device_id __maybe_unused max6697_of_match[] = {
738 {
739 .compatible = "maxim,max6581",
740 .data = (void *)max6581
741 },
742 {
743 .compatible = "maxim,max6602",
744 .data = (void *)max6602
745 },
746 {
747 .compatible = "maxim,max6622",
748 .data = (void *)max6622
749 },
750 {
751 .compatible = "maxim,max6636",
752 .data = (void *)max6636
753 },
754 {
755 .compatible = "maxim,max6689",
756 .data = (void *)max6689
757 },
758 {
759 .compatible = "maxim,max6693",
760 .data = (void *)max6693
761 },
762 {
763 .compatible = "maxim,max6694",
764 .data = (void *)max6694
765 },
766 {
767 .compatible = "maxim,max6697",
768 .data = (void *)max6697
769 },
770 {
771 .compatible = "maxim,max6698",
772 .data = (void *)max6698
773 },
774 {
775 .compatible = "maxim,max6699",
776 .data = (void *)max6699
777 },
778 { },
779};
780MODULE_DEVICE_TABLE(of, max6697_of_match);
781
782static struct i2c_driver max6697_driver = {
783 .driver = {
784 .name = "max6697",
785 .of_match_table = of_match_ptr(max6697_of_match),
786 },
787 .probe = max6697_probe,
788 .id_table = max6697_id,
789};
790
791module_i2c_driver(max6697_driver);
792
793MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
794MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
795MODULE_LICENSE("GPL");