1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 *
6 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl>
7 * Philip Edelbrock <phil@netroedge.com>
8 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl>
9 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable
10 * guidance from Jean Delvare
11 *
12 * Driver supports Analog Devices ADM9240
13 * Dallas Semiconductor DS1780
14 * National Semiconductor LM81
15 *
16 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
17 *
18 * Voltage Six inputs are scaled by chip, VID also reported
19 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris
20 * Fans 2 fans, low speed alarm, automatic fan clock divider
21 * Alarms 16-bit map of active alarms
22 * Analog Out 0..1250 mV output
23 *
24 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
25 *
26 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
27 *
28 * LM81 extended temp reading not implemented
29 */
30
31 #include <linux/bits.h>
32 #include <linux/init.h>
33 #include <linux/module.h>
34 #include <linux/slab.h>
35 #include <linux/i2c.h>
36 #include <linux/hwmon-sysfs.h>
37 #include <linux/hwmon.h>
38 #include <linux/hwmon-vid.h>
39 #include <linux/err.h>
40 #include <linux/mutex.h>
41 #include <linux/regmap.h>
42
43 /* Addresses to scan */
44 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
45 I2C_CLIENT_END };
46
47 enum chips { adm9240, ds1780, lm81 };
48
49 /* ADM9240 registers */
50 #define ADM9240_REG_MAN_ID 0x3e
51 #define ADM9240_REG_DIE_REV 0x3f
52 #define ADM9240_REG_CONFIG 0x40
53
54 #define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
55 #define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
56 #define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
57 #define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
58 #define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
59 #define ADM9240_REG_INT(nr) (0x41 + (nr))
60 #define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
61 #define ADM9240_REG_TEMP 0x27
62 #define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
63 #define ADM9240_REG_ANALOG_OUT 0x19
64 #define ADM9240_REG_CHASSIS_CLEAR 0x46
65 #define ADM9240_REG_VID_FAN_DIV 0x47
66 #define ADM9240_REG_I2C_ADDR 0x48
67 #define ADM9240_REG_VID4 0x49
68 #define ADM9240_REG_TEMP_CONF 0x4b
69
70 /* generalised scaling with integer rounding */
SCALE(long val,int mul,int div)71 static inline int SCALE(long val, int mul, int div)
72 {
73 if (val < 0)
74 return (val * mul - div / 2) / div;
75 else
76 return (val * mul + div / 2) / div;
77 }
78
79 /* adm9240 internally scales voltage measurements */
80 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
81
IN_FROM_REG(u8 reg,int n)82 static inline unsigned int IN_FROM_REG(u8 reg, int n)
83 {
84 return SCALE(reg, nom_mv[n], 192);
85 }
86
IN_TO_REG(unsigned long val,int n)87 static inline u8 IN_TO_REG(unsigned long val, int n)
88 {
89 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
90 return SCALE(val, 192, nom_mv[n]);
91 }
92
93 /* temperature range: -40..125, 127 disables temperature alarm */
TEMP_TO_REG(long val)94 static inline s8 TEMP_TO_REG(long val)
95 {
96 val = clamp_val(val, -40000, 127000);
97 return SCALE(val, 1, 1000);
98 }
99
100 /* two fans, each with low fan speed limit */
FAN_FROM_REG(u8 reg,u8 div)101 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
102 {
103 if (!reg) /* error */
104 return -1;
105
106 if (reg == 255)
107 return 0;
108
109 return SCALE(1350000, 1, reg * div);
110 }
111
112 /* analog out 0..1250mV */
AOUT_TO_REG(unsigned long val)113 static inline u8 AOUT_TO_REG(unsigned long val)
114 {
115 val = clamp_val(val, 0, 1250);
116 return SCALE(val, 255, 1250);
117 }
118
AOUT_FROM_REG(u8 reg)119 static inline unsigned int AOUT_FROM_REG(u8 reg)
120 {
121 return SCALE(reg, 1250, 255);
122 }
123
124 /* per client data */
125 struct adm9240_data {
126 struct device *dev;
127 struct regmap *regmap;
128 struct mutex update_lock;
129
130 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
131 u8 vrm; /* -- vrm set on startup, no accessor */
132 };
133
134 /* write new fan div, callers must hold data->update_lock */
adm9240_write_fan_div(struct adm9240_data * data,int channel,u8 fan_div)135 static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
136 {
137 unsigned int reg, old, shift = (channel + 2) * 2;
138 int err;
139
140 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®);
141 if (err < 0)
142 return err;
143 old = (reg >> shift) & 3;
144 reg &= ~(3 << shift);
145 reg |= (fan_div << shift);
146 err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
147 if (err < 0)
148 return err;
149 dev_dbg(data->dev,
150 "fan%d clock divider changed from %lu to %lu\n",
151 channel + 1, BIT(old), BIT(fan_div));
152
153 return 0;
154 }
155
156 /*
157 * set fan speed low limit:
158 *
159 * - value is zero: disable fan speed low limit alarm
160 *
161 * - value is below fan speed measurement range: enable fan speed low
162 * limit alarm to be asserted while fan speed too slow to measure
163 *
164 * - otherwise: select fan clock divider to suit fan speed low limit,
165 * measurement code may adjust registers to ensure fan speed reading
166 */
adm9240_fan_min_write(struct adm9240_data * data,int channel,long val)167 static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
168 {
169 u8 new_div;
170 u8 fan_min;
171 int err;
172
173 mutex_lock(&data->update_lock);
174
175 if (!val) {
176 fan_min = 255;
177 new_div = data->fan_div[channel];
178
179 dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
180 } else if (val < 1350000 / (8 * 254)) {
181 new_div = 3;
182 fan_min = 254;
183
184 dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
185 channel + 1, FAN_FROM_REG(254, BIT(new_div)));
186 } else {
187 unsigned int new_min = 1350000 / val;
188
189 new_div = 0;
190 while (new_min > 192 && new_div < 3) {
191 new_div++;
192 new_min /= 2;
193 }
194 if (!new_min) /* keep > 0 */
195 new_min++;
196
197 fan_min = new_min;
198
199 dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
200 channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
201 }
202
203 if (new_div != data->fan_div[channel]) {
204 data->fan_div[channel] = new_div;
205 adm9240_write_fan_div(data, channel, new_div);
206 }
207 err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
208
209 mutex_unlock(&data->update_lock);
210
211 return err;
212 }
213
cpu0_vid_show(struct device * dev,struct device_attribute * attr,char * buf)214 static ssize_t cpu0_vid_show(struct device *dev,
215 struct device_attribute *attr, char *buf)
216 {
217 struct adm9240_data *data = dev_get_drvdata(dev);
218 unsigned int regval;
219 int err;
220 u8 vid;
221
222 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®val);
223 if (err < 0)
224 return err;
225 vid = regval & 0x0f;
226 err = regmap_read(data->regmap, ADM9240_REG_VID4, ®val);
227 if (err < 0)
228 return err;
229 vid |= (regval & 1) << 4;
230 return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
231 }
232 static DEVICE_ATTR_RO(cpu0_vid);
233
aout_output_show(struct device * dev,struct device_attribute * attr,char * buf)234 static ssize_t aout_output_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236 {
237 struct adm9240_data *data = dev_get_drvdata(dev);
238 unsigned int regval;
239 int err;
240
241 err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, ®val);
242 if (err)
243 return err;
244
245 return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
246 }
247
aout_output_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)248 static ssize_t aout_output_store(struct device *dev,
249 struct device_attribute *attr,
250 const char *buf, size_t count)
251 {
252 struct adm9240_data *data = dev_get_drvdata(dev);
253 long val;
254 int err;
255
256 err = kstrtol(buf, 10, &val);
257 if (err)
258 return err;
259
260 err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
261 return err < 0 ? err : count;
262 }
263 static DEVICE_ATTR_RW(aout_output);
264
265 static struct attribute *adm9240_attrs[] = {
266 &dev_attr_aout_output.attr,
267 &dev_attr_cpu0_vid.attr,
268 NULL
269 };
270
271 ATTRIBUTE_GROUPS(adm9240);
272
273 /*** sensor chip detect and driver install ***/
274
275 /* Return 0 if detection is successful, -ENODEV otherwise */
adm9240_detect(struct i2c_client * new_client,struct i2c_board_info * info)276 static int adm9240_detect(struct i2c_client *new_client,
277 struct i2c_board_info *info)
278 {
279 struct i2c_adapter *adapter = new_client->adapter;
280 const char *name = "";
281 int address = new_client->addr;
282 u8 man_id, die_rev;
283
284 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
285 return -ENODEV;
286
287 /* verify chip: reg address should match i2c address */
288 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
289 return -ENODEV;
290
291 /* check known chip manufacturer */
292 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
293 if (man_id == 0x23)
294 name = "adm9240";
295 else if (man_id == 0xda)
296 name = "ds1780";
297 else if (man_id == 0x01)
298 name = "lm81";
299 else
300 return -ENODEV;
301
302 /* successful detect, print chip info */
303 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
304 dev_info(&adapter->dev, "found %s revision %u\n",
305 man_id == 0x23 ? "ADM9240" :
306 man_id == 0xda ? "DS1780" : "LM81", die_rev);
307
308 strscpy(info->type, name, I2C_NAME_SIZE);
309
310 return 0;
311 }
312
adm9240_init_client(struct adm9240_data * data)313 static int adm9240_init_client(struct adm9240_data *data)
314 {
315 unsigned int regval;
316 u8 conf, mode;
317 int err;
318
319 err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
320 if (err < 0)
321 return err;
322 err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
323 if (err < 0)
324 return err;
325 mode &= 3;
326
327 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
328
329 dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
330 data->vrm % 10);
331
332 if (conf & 1) { /* measurement cycle running: report state */
333
334 dev_info(data->dev, "status: config 0x%02x mode %u\n",
335 conf, mode);
336
337 } else { /* cold start: open limits before starting chip */
338 int i;
339
340 for (i = 0; i < 6; i++) {
341 err = regmap_write(data->regmap,
342 ADM9240_REG_IN_MIN(i), 0);
343 if (err < 0)
344 return err;
345 err = regmap_write(data->regmap,
346 ADM9240_REG_IN_MAX(i), 255);
347 if (err < 0)
348 return err;
349 }
350 for (i = 0; i < 2; i++) {
351 err = regmap_write(data->regmap,
352 ADM9240_REG_FAN_MIN(i), 255);
353 if (err < 0)
354 return err;
355 }
356 for (i = 0; i < 2; i++) {
357 err = regmap_write(data->regmap,
358 ADM9240_REG_TEMP_MAX(i), 127);
359 if (err < 0)
360 return err;
361 }
362
363 /* start measurement cycle */
364 err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
365 if (err < 0)
366 return err;
367
368 dev_info(data->dev,
369 "cold start: config was 0x%02x mode %u\n", conf, mode);
370 }
371
372 /* read fan divs */
373 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®val);
374 if (err < 0)
375 return err;
376 data->fan_div[0] = (regval >> 4) & 3;
377 data->fan_div[1] = (regval >> 6) & 3;
378 return 0;
379 }
380
adm9240_chip_read(struct device * dev,u32 attr,long * val)381 static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
382 {
383 struct adm9240_data *data = dev_get_drvdata(dev);
384 u8 regs[2];
385 int err;
386
387 switch (attr) {
388 case hwmon_chip_alarms:
389 err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), ®s, 2);
390 if (err < 0)
391 return err;
392 *val = regs[0] | regs[1] << 8;
393 break;
394 default:
395 return -EOPNOTSUPP;
396 }
397 return 0;
398 }
399
adm9240_intrusion_read(struct device * dev,u32 attr,long * val)400 static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
401 {
402 struct adm9240_data *data = dev_get_drvdata(dev);
403 unsigned int regval;
404 int err;
405
406 switch (attr) {
407 case hwmon_intrusion_alarm:
408 err = regmap_read(data->regmap, ADM9240_REG_INT(1), ®val);
409 if (err < 0)
410 return err;
411 *val = !!(regval & BIT(4));
412 break;
413 default:
414 return -EOPNOTSUPP;
415 }
416 return 0;
417 }
418
adm9240_intrusion_write(struct device * dev,u32 attr,long val)419 static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
420 {
421 struct adm9240_data *data = dev_get_drvdata(dev);
422 int err;
423
424 switch (attr) {
425 case hwmon_intrusion_alarm:
426 if (val)
427 return -EINVAL;
428 err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
429 if (err < 0)
430 return err;
431 dev_dbg(data->dev, "chassis intrusion latch cleared\n");
432 break;
433 default:
434 return -EOPNOTSUPP;
435 }
436 return 0;
437 }
438
adm9240_in_read(struct device * dev,u32 attr,int channel,long * val)439 static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
440 {
441 struct adm9240_data *data = dev_get_drvdata(dev);
442 unsigned int regval;
443 int reg;
444 int err;
445
446 switch (attr) {
447 case hwmon_in_input:
448 reg = ADM9240_REG_IN(channel);
449 break;
450 case hwmon_in_min:
451 reg = ADM9240_REG_IN_MIN(channel);
452 break;
453 case hwmon_in_max:
454 reg = ADM9240_REG_IN_MAX(channel);
455 break;
456 case hwmon_in_alarm:
457 if (channel < 4) {
458 reg = ADM9240_REG_INT(0);
459 } else {
460 reg = ADM9240_REG_INT(1);
461 channel -= 4;
462 }
463 err = regmap_read(data->regmap, reg, ®val);
464 if (err < 0)
465 return err;
466 *val = !!(regval & BIT(channel));
467 return 0;
468 default:
469 return -EOPNOTSUPP;
470 }
471 err = regmap_read(data->regmap, reg, ®val);
472 if (err < 0)
473 return err;
474 *val = IN_FROM_REG(regval, channel);
475 return 0;
476 }
477
adm9240_in_write(struct device * dev,u32 attr,int channel,long val)478 static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
479 {
480 struct adm9240_data *data = dev_get_drvdata(dev);
481 int reg;
482
483 switch (attr) {
484 case hwmon_in_min:
485 reg = ADM9240_REG_IN_MIN(channel);
486 break;
487 case hwmon_in_max:
488 reg = ADM9240_REG_IN_MAX(channel);
489 break;
490 default:
491 return -EOPNOTSUPP;
492 }
493 return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
494 }
495
adm9240_fan_read(struct device * dev,u32 attr,int channel,long * val)496 static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
497 {
498 struct adm9240_data *data = dev_get_drvdata(dev);
499 unsigned int regval;
500 int err;
501
502 switch (attr) {
503 case hwmon_fan_input:
504 err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), ®val);
505 if (err < 0)
506 return err;
507 if (regval == 255 && data->fan_div[channel] < 3) {
508 /* adjust fan clock divider on overflow */
509 err = adm9240_write_fan_div(data, channel,
510 ++data->fan_div[channel]);
511 if (err)
512 return err;
513 }
514 *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
515 break;
516 case hwmon_fan_div:
517 *val = BIT(data->fan_div[channel]);
518 break;
519 case hwmon_fan_min:
520 err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), ®val);
521 if (err < 0)
522 return err;
523 *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
524 break;
525 case hwmon_fan_alarm:
526 err = regmap_read(data->regmap, ADM9240_REG_INT(0), ®val);
527 if (err < 0)
528 return err;
529 *val = !!(regval & BIT(channel + 6));
530 break;
531 default:
532 return -EOPNOTSUPP;
533 }
534 return 0;
535 }
536
adm9240_fan_write(struct device * dev,u32 attr,int channel,long val)537 static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
538 {
539 struct adm9240_data *data = dev_get_drvdata(dev);
540 int err;
541
542 switch (attr) {
543 case hwmon_fan_min:
544 err = adm9240_fan_min_write(data, channel, val);
545 if (err < 0)
546 return err;
547 break;
548 default:
549 return -EOPNOTSUPP;
550 }
551 return 0;
552 }
553
adm9240_temp_read(struct device * dev,u32 attr,int channel,long * val)554 static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
555 {
556 struct adm9240_data *data = dev_get_drvdata(dev);
557 unsigned int regval;
558 int err, temp;
559
560 switch (attr) {
561 case hwmon_temp_input:
562 err = regmap_read(data->regmap, ADM9240_REG_TEMP, ®val);
563 if (err < 0)
564 return err;
565 temp = regval << 1;
566 err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, ®val);
567 if (err < 0)
568 return err;
569 temp |= regval >> 7;
570 *val = sign_extend32(temp, 8) * 500;
571 break;
572 case hwmon_temp_max:
573 err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), ®val);
574 if (err < 0)
575 return err;
576 *val = (s8)regval * 1000;
577 break;
578 case hwmon_temp_max_hyst:
579 err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), ®val);
580 if (err < 0)
581 return err;
582 *val = (s8)regval * 1000;
583 break;
584 case hwmon_temp_alarm:
585 err = regmap_read(data->regmap, ADM9240_REG_INT(0), ®val);
586 if (err < 0)
587 return err;
588 *val = !!(regval & BIT(4));
589 break;
590 default:
591 return -EOPNOTSUPP;
592 }
593 return 0;
594 }
595
adm9240_temp_write(struct device * dev,u32 attr,int channel,long val)596 static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
597 {
598 struct adm9240_data *data = dev_get_drvdata(dev);
599 int reg;
600
601 switch (attr) {
602 case hwmon_temp_max:
603 reg = ADM9240_REG_TEMP_MAX(0);
604 break;
605 case hwmon_temp_max_hyst:
606 reg = ADM9240_REG_TEMP_MAX(1);
607 break;
608 default:
609 return -EOPNOTSUPP;
610 }
611 return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
612 }
613
adm9240_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)614 static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
615 int channel, long *val)
616 {
617 switch (type) {
618 case hwmon_chip:
619 return adm9240_chip_read(dev, attr, val);
620 case hwmon_intrusion:
621 return adm9240_intrusion_read(dev, attr, val);
622 case hwmon_in:
623 return adm9240_in_read(dev, attr, channel, val);
624 case hwmon_fan:
625 return adm9240_fan_read(dev, attr, channel, val);
626 case hwmon_temp:
627 return adm9240_temp_read(dev, attr, channel, val);
628 default:
629 return -EOPNOTSUPP;
630 }
631 }
632
adm9240_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)633 static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
634 int channel, long val)
635 {
636 switch (type) {
637 case hwmon_intrusion:
638 return adm9240_intrusion_write(dev, attr, val);
639 case hwmon_in:
640 return adm9240_in_write(dev, attr, channel, val);
641 case hwmon_fan:
642 return adm9240_fan_write(dev, attr, channel, val);
643 case hwmon_temp:
644 return adm9240_temp_write(dev, attr, channel, val);
645 default:
646 return -EOPNOTSUPP;
647 }
648 }
649
adm9240_is_visible(const void * _data,enum hwmon_sensor_types type,u32 attr,int channel)650 static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
651 u32 attr, int channel)
652 {
653 umode_t mode = 0;
654
655 switch (type) {
656 case hwmon_chip:
657 switch (attr) {
658 case hwmon_chip_alarms:
659 mode = 0444;
660 break;
661 default:
662 break;
663 }
664 break;
665 case hwmon_intrusion:
666 switch (attr) {
667 case hwmon_intrusion_alarm:
668 mode = 0644;
669 break;
670 default:
671 break;
672 }
673 break;
674 case hwmon_temp:
675 switch (attr) {
676 case hwmon_temp:
677 case hwmon_temp_alarm:
678 mode = 0444;
679 break;
680 case hwmon_temp_max:
681 case hwmon_temp_max_hyst:
682 mode = 0644;
683 break;
684 default:
685 break;
686 }
687 break;
688 case hwmon_fan:
689 switch (attr) {
690 case hwmon_fan_input:
691 case hwmon_fan_div:
692 case hwmon_fan_alarm:
693 mode = 0444;
694 break;
695 case hwmon_fan_min:
696 mode = 0644;
697 break;
698 default:
699 break;
700 }
701 break;
702 case hwmon_in:
703 switch (attr) {
704 case hwmon_in_input:
705 case hwmon_in_alarm:
706 mode = 0444;
707 break;
708 case hwmon_in_min:
709 case hwmon_in_max:
710 mode = 0644;
711 break;
712 default:
713 break;
714 }
715 break;
716 default:
717 break;
718 }
719 return mode;
720 }
721
722 static const struct hwmon_ops adm9240_hwmon_ops = {
723 .is_visible = adm9240_is_visible,
724 .read = adm9240_read,
725 .write = adm9240_write,
726 };
727
728 static const struct hwmon_channel_info *adm9240_info[] = {
729 HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
730 HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
731 HWMON_CHANNEL_INFO(temp,
732 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
733 HWMON_CHANNEL_INFO(in,
734 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
735 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
736 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
737 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
738 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
739 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
740 HWMON_CHANNEL_INFO(fan,
741 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
742 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
743 NULL
744 };
745
746 static const struct hwmon_chip_info adm9240_chip_info = {
747 .ops = &adm9240_hwmon_ops,
748 .info = adm9240_info,
749 };
750
adm9240_volatile_reg(struct device * dev,unsigned int reg)751 static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
752 {
753 switch (reg) {
754 case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
755 case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
756 case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
757 case ADM9240_REG_TEMP:
758 case ADM9240_REG_TEMP_CONF:
759 case ADM9240_REG_VID_FAN_DIV:
760 case ADM9240_REG_VID4:
761 case ADM9240_REG_ANALOG_OUT:
762 return true;
763 default:
764 return false;
765 }
766 }
767
768 static const struct regmap_config adm9240_regmap_config = {
769 .reg_bits = 8,
770 .val_bits = 8,
771 .use_single_read = true,
772 .use_single_write = true,
773 .volatile_reg = adm9240_volatile_reg,
774 };
775
adm9240_probe(struct i2c_client * client)776 static int adm9240_probe(struct i2c_client *client)
777 {
778 struct device *dev = &client->dev;
779 struct device *hwmon_dev;
780 struct adm9240_data *data;
781 int err;
782
783 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
784 if (!data)
785 return -ENOMEM;
786
787 data->dev = dev;
788 mutex_init(&data->update_lock);
789 data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
790 if (IS_ERR(data->regmap))
791 return PTR_ERR(data->regmap);
792
793 err = adm9240_init_client(data);
794 if (err < 0)
795 return err;
796
797 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
798 &adm9240_chip_info,
799 adm9240_groups);
800 return PTR_ERR_OR_ZERO(hwmon_dev);
801 }
802
803 static const struct i2c_device_id adm9240_id[] = {
804 { "adm9240", adm9240 },
805 { "ds1780", ds1780 },
806 { "lm81", lm81 },
807 { }
808 };
809 MODULE_DEVICE_TABLE(i2c, adm9240_id);
810
811 static struct i2c_driver adm9240_driver = {
812 .class = I2C_CLASS_HWMON,
813 .driver = {
814 .name = "adm9240",
815 },
816 .probe_new = adm9240_probe,
817 .id_table = adm9240_id,
818 .detect = adm9240_detect,
819 .address_list = normal_i2c,
820 };
821
822 module_i2c_driver(adm9240_driver);
823
824 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
825 "Grant Coady <gcoady.lk@gmail.com> and others");
826 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
827 MODULE_LICENSE("GPL");
828