xref: /openbmc/linux/drivers/hwmon/asc7621.c (revision 1975d167)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * asc7621.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
4  * Copyright (c) 2007, 2010 George Joseph  <george.joseph@fairview5.com>
5  */
6 
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/jiffies.h>
11 #include <linux/i2c.h>
12 #include <linux/hwmon.h>
13 #include <linux/hwmon-sysfs.h>
14 #include <linux/err.h>
15 #include <linux/mutex.h>
16 
17 /* Addresses to scan */
18 static const unsigned short normal_i2c[] = {
19 	0x2c, 0x2d, 0x2e, I2C_CLIENT_END
20 };
21 
22 enum asc7621_type {
23 	asc7621,
24 	asc7621a
25 };
26 
27 #define INTERVAL_HIGH   (HZ + HZ / 2)
28 #define INTERVAL_LOW    (1 * 60 * HZ)
29 #define PRI_NONE        0
30 #define PRI_LOW         1
31 #define PRI_HIGH        2
32 #define FIRST_CHIP      asc7621
33 #define LAST_CHIP       asc7621a
34 
35 struct asc7621_chip {
36 	char *name;
37 	enum asc7621_type chip_type;
38 	u8 company_reg;
39 	u8 company_id;
40 	u8 verstep_reg;
41 	u8 verstep_id;
42 	const unsigned short *addresses;
43 };
44 
45 static struct asc7621_chip asc7621_chips[] = {
46 	{
47 		.name = "asc7621",
48 		.chip_type = asc7621,
49 		.company_reg = 0x3e,
50 		.company_id = 0x61,
51 		.verstep_reg = 0x3f,
52 		.verstep_id = 0x6c,
53 		.addresses = normal_i2c,
54 	 },
55 	{
56 		.name = "asc7621a",
57 		.chip_type = asc7621a,
58 		.company_reg = 0x3e,
59 		.company_id = 0x61,
60 		.verstep_reg = 0x3f,
61 		.verstep_id = 0x6d,
62 		.addresses = normal_i2c,
63 	 },
64 };
65 
66 /*
67  * Defines the highest register to be used, not the count.
68  * The actual count will probably be smaller because of gaps
69  * in the implementation (unused register locations).
70  * This define will safely set the array size of both the parameter
71  * and data arrays.
72  * This comes from the data sheet register description table.
73  */
74 #define LAST_REGISTER 0xff
75 
76 struct asc7621_data {
77 	struct i2c_client client;
78 	struct device *class_dev;
79 	struct mutex update_lock;
80 	bool valid;		/* true if following fields are valid */
81 	unsigned long last_high_reading;	/* In jiffies */
82 	unsigned long last_low_reading;		/* In jiffies */
83 	/*
84 	 * Registers we care about occupy the corresponding index
85 	 * in the array.  Registers we don't care about are left
86 	 * at 0.
87 	 */
88 	u8 reg[LAST_REGISTER + 1];
89 };
90 
91 /*
92  * Macro to get the parent asc7621_param structure
93  * from a sensor_device_attribute passed into the
94  * show/store functions.
95  */
96 #define to_asc7621_param(_sda) \
97 	container_of(_sda, struct asc7621_param, sda)
98 
99 /*
100  * Each parameter to be retrieved needs an asc7621_param structure
101  * allocated.  It contains the sensor_device_attribute structure
102  * and the control info needed to retrieve the value from the register map.
103  */
104 struct asc7621_param {
105 	struct sensor_device_attribute sda;
106 	u8 priority;
107 	u8 msb[3];
108 	u8 lsb[3];
109 	u8 mask[3];
110 	u8 shift[3];
111 };
112 
113 /*
114  * This is the map that ultimately indicates whether we'll be
115  * retrieving a register value or not, and at what frequency.
116  */
117 static u8 asc7621_register_priorities[255];
118 
119 static struct asc7621_data *asc7621_update_device(struct device *dev);
120 
read_byte(struct i2c_client * client,u8 reg)121 static inline u8 read_byte(struct i2c_client *client, u8 reg)
122 {
123 	int res = i2c_smbus_read_byte_data(client, reg);
124 	if (res < 0) {
125 		dev_err(&client->dev,
126 			"Unable to read from register 0x%02x.\n", reg);
127 		return 0;
128 	}
129 	return res & 0xff;
130 }
131 
write_byte(struct i2c_client * client,u8 reg,u8 data)132 static inline int write_byte(struct i2c_client *client, u8 reg, u8 data)
133 {
134 	int res = i2c_smbus_write_byte_data(client, reg, data);
135 	if (res < 0) {
136 		dev_err(&client->dev,
137 			"Unable to write value 0x%02x to register 0x%02x.\n",
138 			data, reg);
139 	}
140 	return res;
141 }
142 
143 /*
144  * Data Handlers
145  * Each function handles the formatting, storage
146  * and retrieval of like parameters.
147  */
148 
149 #define SETUP_SHOW_DATA_PARAM(d, a) \
150 	struct sensor_device_attribute *sda = to_sensor_dev_attr(a); \
151 	struct asc7621_data *data = asc7621_update_device(d); \
152 	struct asc7621_param *param = to_asc7621_param(sda)
153 
154 #define SETUP_STORE_DATA_PARAM(d, a) \
155 	struct sensor_device_attribute *sda = to_sensor_dev_attr(a); \
156 	struct i2c_client *client = to_i2c_client(d); \
157 	struct asc7621_data *data = i2c_get_clientdata(client); \
158 	struct asc7621_param *param = to_asc7621_param(sda)
159 
160 /*
161  * u8 is just what it sounds like...an unsigned byte with no
162  * special formatting.
163  */
show_u8(struct device * dev,struct device_attribute * attr,char * buf)164 static ssize_t show_u8(struct device *dev, struct device_attribute *attr,
165 		       char *buf)
166 {
167 	SETUP_SHOW_DATA_PARAM(dev, attr);
168 
169 	return sprintf(buf, "%u\n", data->reg[param->msb[0]]);
170 }
171 
store_u8(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)172 static ssize_t store_u8(struct device *dev, struct device_attribute *attr,
173 			const char *buf, size_t count)
174 {
175 	SETUP_STORE_DATA_PARAM(dev, attr);
176 	long reqval;
177 
178 	if (kstrtol(buf, 10, &reqval))
179 		return -EINVAL;
180 
181 	reqval = clamp_val(reqval, 0, 255);
182 
183 	mutex_lock(&data->update_lock);
184 	data->reg[param->msb[0]] = reqval;
185 	write_byte(client, param->msb[0], reqval);
186 	mutex_unlock(&data->update_lock);
187 	return count;
188 }
189 
190 /*
191  * Many of the config values occupy only a few bits of a register.
192  */
show_bitmask(struct device * dev,struct device_attribute * attr,char * buf)193 static ssize_t show_bitmask(struct device *dev,
194 			    struct device_attribute *attr, char *buf)
195 {
196 	SETUP_SHOW_DATA_PARAM(dev, attr);
197 
198 	return sprintf(buf, "%u\n",
199 		       (data->reg[param->msb[0]] >> param->
200 			shift[0]) & param->mask[0]);
201 }
202 
store_bitmask(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)203 static ssize_t store_bitmask(struct device *dev,
204 			     struct device_attribute *attr,
205 			     const char *buf, size_t count)
206 {
207 	SETUP_STORE_DATA_PARAM(dev, attr);
208 	long reqval;
209 	u8 currval;
210 
211 	if (kstrtol(buf, 10, &reqval))
212 		return -EINVAL;
213 
214 	reqval = clamp_val(reqval, 0, param->mask[0]);
215 
216 	reqval = (reqval & param->mask[0]) << param->shift[0];
217 
218 	mutex_lock(&data->update_lock);
219 	currval = read_byte(client, param->msb[0]);
220 	reqval |= (currval & ~(param->mask[0] << param->shift[0]));
221 	data->reg[param->msb[0]] = reqval;
222 	write_byte(client, param->msb[0], reqval);
223 	mutex_unlock(&data->update_lock);
224 	return count;
225 }
226 
227 /*
228  * 16 bit fan rpm values
229  * reported by the device as the number of 11.111us periods (90khz)
230  * between full fan rotations.  Therefore...
231  * RPM = (90000 * 60) / register value
232  */
show_fan16(struct device * dev,struct device_attribute * attr,char * buf)233 static ssize_t show_fan16(struct device *dev,
234 			  struct device_attribute *attr, char *buf)
235 {
236 	SETUP_SHOW_DATA_PARAM(dev, attr);
237 	u16 regval;
238 
239 	mutex_lock(&data->update_lock);
240 	regval = (data->reg[param->msb[0]] << 8) | data->reg[param->lsb[0]];
241 	mutex_unlock(&data->update_lock);
242 
243 	return sprintf(buf, "%u\n",
244 		       (regval == 0 ? -1 : (regval) ==
245 			0xffff ? 0 : 5400000 / regval));
246 }
247 
store_fan16(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)248 static ssize_t store_fan16(struct device *dev,
249 			   struct device_attribute *attr, const char *buf,
250 			   size_t count)
251 {
252 	SETUP_STORE_DATA_PARAM(dev, attr);
253 	long reqval;
254 
255 	if (kstrtol(buf, 10, &reqval))
256 		return -EINVAL;
257 
258 	/*
259 	 * If a minimum RPM of zero is requested, then we set the register to
260 	 * 0xffff. This value allows the fan to be stopped completely without
261 	 * generating an alarm.
262 	 */
263 	reqval =
264 	    (reqval <= 0 ? 0xffff : clamp_val(5400000 / reqval, 0, 0xfffe));
265 
266 	mutex_lock(&data->update_lock);
267 	data->reg[param->msb[0]] = (reqval >> 8) & 0xff;
268 	data->reg[param->lsb[0]] = reqval & 0xff;
269 	write_byte(client, param->msb[0], data->reg[param->msb[0]]);
270 	write_byte(client, param->lsb[0], data->reg[param->lsb[0]]);
271 	mutex_unlock(&data->update_lock);
272 
273 	return count;
274 }
275 
276 /*
277  * Voltages are scaled in the device so that the nominal voltage
278  * is 3/4ths of the 0-255 range (i.e. 192).
279  * If all voltages are 'normal' then all voltage registers will
280  * read 0xC0.
281  *
282  * The data sheet provides us with the 3/4 scale value for each voltage
283  * which is stored in in_scaling.  The sda->index parameter value provides
284  * the index into in_scaling.
285  *
286  * NOTE: The chip expects the first 2 inputs be 2.5 and 2.25 volts
287  * respectively. That doesn't mean that's what the motherboard provides. :)
288  */
289 
290 static const int asc7621_in_scaling[] = {
291 	2500, 2250, 3300, 5000, 12000
292 };
293 
show_in10(struct device * dev,struct device_attribute * attr,char * buf)294 static ssize_t show_in10(struct device *dev, struct device_attribute *attr,
295 			 char *buf)
296 {
297 	SETUP_SHOW_DATA_PARAM(dev, attr);
298 	u16 regval;
299 	u8 nr = sda->index;
300 
301 	mutex_lock(&data->update_lock);
302 	regval = (data->reg[param->msb[0]] << 8) | (data->reg[param->lsb[0]]);
303 	mutex_unlock(&data->update_lock);
304 
305 	/* The LSB value is a 2-bit scaling of the MSB's LSbit value. */
306 	regval = (regval >> 6) * asc7621_in_scaling[nr] / (0xc0 << 2);
307 
308 	return sprintf(buf, "%u\n", regval);
309 }
310 
311 /* 8 bit voltage values (the mins and maxs) */
show_in8(struct device * dev,struct device_attribute * attr,char * buf)312 static ssize_t show_in8(struct device *dev, struct device_attribute *attr,
313 			char *buf)
314 {
315 	SETUP_SHOW_DATA_PARAM(dev, attr);
316 	u8 nr = sda->index;
317 
318 	return sprintf(buf, "%u\n",
319 		       ((data->reg[param->msb[0]] *
320 			 asc7621_in_scaling[nr]) / 0xc0));
321 }
322 
store_in8(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)323 static ssize_t store_in8(struct device *dev, struct device_attribute *attr,
324 			 const char *buf, size_t count)
325 {
326 	SETUP_STORE_DATA_PARAM(dev, attr);
327 	long reqval;
328 	u8 nr = sda->index;
329 
330 	if (kstrtol(buf, 10, &reqval))
331 		return -EINVAL;
332 
333 	reqval = clamp_val(reqval, 0, 0xffff);
334 
335 	reqval = reqval * 0xc0 / asc7621_in_scaling[nr];
336 
337 	reqval = clamp_val(reqval, 0, 0xff);
338 
339 	mutex_lock(&data->update_lock);
340 	data->reg[param->msb[0]] = reqval;
341 	write_byte(client, param->msb[0], reqval);
342 	mutex_unlock(&data->update_lock);
343 
344 	return count;
345 }
346 
show_temp8(struct device * dev,struct device_attribute * attr,char * buf)347 static ssize_t show_temp8(struct device *dev,
348 			  struct device_attribute *attr, char *buf)
349 {
350 	SETUP_SHOW_DATA_PARAM(dev, attr);
351 
352 	return sprintf(buf, "%d\n", ((s8) data->reg[param->msb[0]]) * 1000);
353 }
354 
store_temp8(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)355 static ssize_t store_temp8(struct device *dev,
356 			   struct device_attribute *attr, const char *buf,
357 			   size_t count)
358 {
359 	SETUP_STORE_DATA_PARAM(dev, attr);
360 	long reqval;
361 	s8 temp;
362 
363 	if (kstrtol(buf, 10, &reqval))
364 		return -EINVAL;
365 
366 	reqval = clamp_val(reqval, -127000, 127000);
367 
368 	temp = reqval / 1000;
369 
370 	mutex_lock(&data->update_lock);
371 	data->reg[param->msb[0]] = temp;
372 	write_byte(client, param->msb[0], temp);
373 	mutex_unlock(&data->update_lock);
374 	return count;
375 }
376 
377 /*
378  * Temperatures that occupy 2 bytes always have the whole
379  * number of degrees in the MSB with some part of the LSB
380  * indicating fractional degrees.
381  */
382 
383 /*   mmmmmmmm.llxxxxxx */
show_temp10(struct device * dev,struct device_attribute * attr,char * buf)384 static ssize_t show_temp10(struct device *dev,
385 			   struct device_attribute *attr, char *buf)
386 {
387 	SETUP_SHOW_DATA_PARAM(dev, attr);
388 	u8 msb, lsb;
389 	int temp;
390 
391 	mutex_lock(&data->update_lock);
392 	msb = data->reg[param->msb[0]];
393 	lsb = (data->reg[param->lsb[0]] >> 6) & 0x03;
394 	temp = (((s8) msb) * 1000) + (lsb * 250);
395 	mutex_unlock(&data->update_lock);
396 
397 	return sprintf(buf, "%d\n", temp);
398 }
399 
400 /*   mmmmmm.ll */
show_temp62(struct device * dev,struct device_attribute * attr,char * buf)401 static ssize_t show_temp62(struct device *dev,
402 			   struct device_attribute *attr, char *buf)
403 {
404 	SETUP_SHOW_DATA_PARAM(dev, attr);
405 	u8 regval = data->reg[param->msb[0]];
406 	int temp = ((s8) (regval & 0xfc) * 1000) + ((regval & 0x03) * 250);
407 
408 	return sprintf(buf, "%d\n", temp);
409 }
410 
store_temp62(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)411 static ssize_t store_temp62(struct device *dev,
412 			    struct device_attribute *attr, const char *buf,
413 			    size_t count)
414 {
415 	SETUP_STORE_DATA_PARAM(dev, attr);
416 	long reqval, i, f;
417 	s8 temp;
418 
419 	if (kstrtol(buf, 10, &reqval))
420 		return -EINVAL;
421 
422 	reqval = clamp_val(reqval, -32000, 31750);
423 	i = reqval / 1000;
424 	f = reqval - (i * 1000);
425 	temp = i << 2;
426 	temp |= f / 250;
427 
428 	mutex_lock(&data->update_lock);
429 	data->reg[param->msb[0]] = temp;
430 	write_byte(client, param->msb[0], temp);
431 	mutex_unlock(&data->update_lock);
432 	return count;
433 }
434 
435 /*
436  * The aSC7621 doesn't provide an "auto_point2".  Instead, you
437  * specify the auto_point1 and a range.  To keep with the sysfs
438  * hwmon specs, we synthesize the auto_point_2 from them.
439  */
440 
441 static const u32 asc7621_range_map[] = {
442 	2000, 2500, 3330, 4000, 5000, 6670, 8000, 10000,
443 	13330, 16000, 20000, 26670, 32000, 40000, 53330, 80000,
444 };
445 
show_ap2_temp(struct device * dev,struct device_attribute * attr,char * buf)446 static ssize_t show_ap2_temp(struct device *dev,
447 			     struct device_attribute *attr, char *buf)
448 {
449 	SETUP_SHOW_DATA_PARAM(dev, attr);
450 	long auto_point1;
451 	u8 regval;
452 	int temp;
453 
454 	mutex_lock(&data->update_lock);
455 	auto_point1 = ((s8) data->reg[param->msb[1]]) * 1000;
456 	regval =
457 	    ((data->reg[param->msb[0]] >> param->shift[0]) & param->mask[0]);
458 	temp = auto_point1 + asc7621_range_map[clamp_val(regval, 0, 15)];
459 	mutex_unlock(&data->update_lock);
460 
461 	return sprintf(buf, "%d\n", temp);
462 
463 }
464 
store_ap2_temp(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)465 static ssize_t store_ap2_temp(struct device *dev,
466 			      struct device_attribute *attr,
467 			      const char *buf, size_t count)
468 {
469 	SETUP_STORE_DATA_PARAM(dev, attr);
470 	long reqval, auto_point1;
471 	int i;
472 	u8 currval, newval = 0;
473 
474 	if (kstrtol(buf, 10, &reqval))
475 		return -EINVAL;
476 
477 	mutex_lock(&data->update_lock);
478 	auto_point1 = data->reg[param->msb[1]] * 1000;
479 	reqval = clamp_val(reqval, auto_point1 + 2000, auto_point1 + 80000);
480 
481 	for (i = ARRAY_SIZE(asc7621_range_map) - 1; i >= 0; i--) {
482 		if (reqval >= auto_point1 + asc7621_range_map[i]) {
483 			newval = i;
484 			break;
485 		}
486 	}
487 
488 	newval = (newval & param->mask[0]) << param->shift[0];
489 	currval = read_byte(client, param->msb[0]);
490 	newval |= (currval & ~(param->mask[0] << param->shift[0]));
491 	data->reg[param->msb[0]] = newval;
492 	write_byte(client, param->msb[0], newval);
493 	mutex_unlock(&data->update_lock);
494 	return count;
495 }
496 
show_pwm_ac(struct device * dev,struct device_attribute * attr,char * buf)497 static ssize_t show_pwm_ac(struct device *dev,
498 			   struct device_attribute *attr, char *buf)
499 {
500 	SETUP_SHOW_DATA_PARAM(dev, attr);
501 	u8 config, altbit, regval;
502 	static const u8 map[] = {
503 		0x01, 0x02, 0x04, 0x1f, 0x00, 0x06, 0x07, 0x10,
504 		0x08, 0x0f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f
505 	};
506 
507 	mutex_lock(&data->update_lock);
508 	config = (data->reg[param->msb[0]] >> param->shift[0]) & param->mask[0];
509 	altbit = (data->reg[param->msb[1]] >> param->shift[1]) & param->mask[1];
510 	regval = config | (altbit << 3);
511 	mutex_unlock(&data->update_lock);
512 
513 	return sprintf(buf, "%u\n", map[clamp_val(regval, 0, 15)]);
514 }
515 
store_pwm_ac(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)516 static ssize_t store_pwm_ac(struct device *dev,
517 			    struct device_attribute *attr,
518 			    const char *buf, size_t count)
519 {
520 	SETUP_STORE_DATA_PARAM(dev, attr);
521 	unsigned long reqval;
522 	u8 currval, config, altbit, newval;
523 	static const u16 map[] = {
524 		0x04, 0x00, 0x01, 0xff, 0x02, 0xff, 0x05, 0x06,
525 		0x08, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f,
526 		0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
527 		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x03,
528 	};
529 
530 	if (kstrtoul(buf, 10, &reqval))
531 		return -EINVAL;
532 
533 	if (reqval > 31)
534 		return -EINVAL;
535 
536 	reqval = map[reqval];
537 	if (reqval == 0xff)
538 		return -EINVAL;
539 
540 	config = reqval & 0x07;
541 	altbit = (reqval >> 3) & 0x01;
542 
543 	config = (config & param->mask[0]) << param->shift[0];
544 	altbit = (altbit & param->mask[1]) << param->shift[1];
545 
546 	mutex_lock(&data->update_lock);
547 	currval = read_byte(client, param->msb[0]);
548 	newval = config | (currval & ~(param->mask[0] << param->shift[0]));
549 	newval = altbit | (newval & ~(param->mask[1] << param->shift[1]));
550 	data->reg[param->msb[0]] = newval;
551 	write_byte(client, param->msb[0], newval);
552 	mutex_unlock(&data->update_lock);
553 	return count;
554 }
555 
show_pwm_enable(struct device * dev,struct device_attribute * attr,char * buf)556 static ssize_t show_pwm_enable(struct device *dev,
557 			       struct device_attribute *attr, char *buf)
558 {
559 	SETUP_SHOW_DATA_PARAM(dev, attr);
560 	u8 config, altbit, minoff, val, newval;
561 
562 	mutex_lock(&data->update_lock);
563 	config = (data->reg[param->msb[0]] >> param->shift[0]) & param->mask[0];
564 	altbit = (data->reg[param->msb[1]] >> param->shift[1]) & param->mask[1];
565 	minoff = (data->reg[param->msb[2]] >> param->shift[2]) & param->mask[2];
566 	mutex_unlock(&data->update_lock);
567 
568 	val = config | (altbit << 3);
569 
570 	if (val == 3 || val >= 10)
571 		newval = 255;
572 	else if (val == 4)
573 		newval = 0;
574 	else if (val == 7)
575 		newval = 1;
576 	else if (minoff == 1)
577 		newval = 2;
578 	else
579 		newval = 3;
580 
581 	return sprintf(buf, "%u\n", newval);
582 }
583 
store_pwm_enable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)584 static ssize_t store_pwm_enable(struct device *dev,
585 				struct device_attribute *attr,
586 				const char *buf, size_t count)
587 {
588 	SETUP_STORE_DATA_PARAM(dev, attr);
589 	long reqval;
590 	u8 currval, config, altbit, newval, minoff = 255;
591 
592 	if (kstrtol(buf, 10, &reqval))
593 		return -EINVAL;
594 
595 	switch (reqval) {
596 	case 0:
597 		newval = 0x04;
598 		break;
599 	case 1:
600 		newval = 0x07;
601 		break;
602 	case 2:
603 		newval = 0x00;
604 		minoff = 1;
605 		break;
606 	case 3:
607 		newval = 0x00;
608 		minoff = 0;
609 		break;
610 	case 255:
611 		newval = 0x03;
612 		break;
613 	default:
614 		return -EINVAL;
615 	}
616 
617 	config = newval & 0x07;
618 	altbit = (newval >> 3) & 0x01;
619 
620 	mutex_lock(&data->update_lock);
621 	config = (config & param->mask[0]) << param->shift[0];
622 	altbit = (altbit & param->mask[1]) << param->shift[1];
623 	currval = read_byte(client, param->msb[0]);
624 	newval = config | (currval & ~(param->mask[0] << param->shift[0]));
625 	newval = altbit | (newval & ~(param->mask[1] << param->shift[1]));
626 	data->reg[param->msb[0]] = newval;
627 	write_byte(client, param->msb[0], newval);
628 	if (minoff < 255) {
629 		minoff = (minoff & param->mask[2]) << param->shift[2];
630 		currval = read_byte(client, param->msb[2]);
631 		newval =
632 		    minoff | (currval & ~(param->mask[2] << param->shift[2]));
633 		data->reg[param->msb[2]] = newval;
634 		write_byte(client, param->msb[2], newval);
635 	}
636 	mutex_unlock(&data->update_lock);
637 	return count;
638 }
639 
640 static const u32 asc7621_pwm_freq_map[] = {
641 	10, 15, 23, 30, 38, 47, 62, 94,
642 	23000, 24000, 25000, 26000, 27000, 28000, 29000, 30000
643 };
644 
show_pwm_freq(struct device * dev,struct device_attribute * attr,char * buf)645 static ssize_t show_pwm_freq(struct device *dev,
646 			     struct device_attribute *attr, char *buf)
647 {
648 	SETUP_SHOW_DATA_PARAM(dev, attr);
649 	u8 regval =
650 	    (data->reg[param->msb[0]] >> param->shift[0]) & param->mask[0];
651 
652 	regval = clamp_val(regval, 0, 15);
653 
654 	return sprintf(buf, "%u\n", asc7621_pwm_freq_map[regval]);
655 }
656 
store_pwm_freq(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)657 static ssize_t store_pwm_freq(struct device *dev,
658 			      struct device_attribute *attr,
659 			      const char *buf, size_t count)
660 {
661 	SETUP_STORE_DATA_PARAM(dev, attr);
662 	unsigned long reqval;
663 	u8 currval, newval = 255;
664 	int i;
665 
666 	if (kstrtoul(buf, 10, &reqval))
667 		return -EINVAL;
668 
669 	for (i = 0; i < ARRAY_SIZE(asc7621_pwm_freq_map); i++) {
670 		if (reqval == asc7621_pwm_freq_map[i]) {
671 			newval = i;
672 			break;
673 		}
674 	}
675 	if (newval == 255)
676 		return -EINVAL;
677 
678 	newval = (newval & param->mask[0]) << param->shift[0];
679 
680 	mutex_lock(&data->update_lock);
681 	currval = read_byte(client, param->msb[0]);
682 	newval |= (currval & ~(param->mask[0] << param->shift[0]));
683 	data->reg[param->msb[0]] = newval;
684 	write_byte(client, param->msb[0], newval);
685 	mutex_unlock(&data->update_lock);
686 	return count;
687 }
688 
689 static const u32 asc7621_pwm_auto_spinup_map[] =  {
690 	0, 100, 250, 400, 700, 1000, 2000, 4000
691 };
692 
show_pwm_ast(struct device * dev,struct device_attribute * attr,char * buf)693 static ssize_t show_pwm_ast(struct device *dev,
694 			    struct device_attribute *attr, char *buf)
695 {
696 	SETUP_SHOW_DATA_PARAM(dev, attr);
697 	u8 regval =
698 	    (data->reg[param->msb[0]] >> param->shift[0]) & param->mask[0];
699 
700 	regval = clamp_val(regval, 0, 7);
701 
702 	return sprintf(buf, "%u\n", asc7621_pwm_auto_spinup_map[regval]);
703 
704 }
705 
store_pwm_ast(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)706 static ssize_t store_pwm_ast(struct device *dev,
707 			     struct device_attribute *attr,
708 			     const char *buf, size_t count)
709 {
710 	SETUP_STORE_DATA_PARAM(dev, attr);
711 	long reqval;
712 	u8 currval, newval = 255;
713 	u32 i;
714 
715 	if (kstrtol(buf, 10, &reqval))
716 		return -EINVAL;
717 
718 	for (i = 0; i < ARRAY_SIZE(asc7621_pwm_auto_spinup_map); i++) {
719 		if (reqval == asc7621_pwm_auto_spinup_map[i]) {
720 			newval = i;
721 			break;
722 		}
723 	}
724 	if (newval == 255)
725 		return -EINVAL;
726 
727 	newval = (newval & param->mask[0]) << param->shift[0];
728 
729 	mutex_lock(&data->update_lock);
730 	currval = read_byte(client, param->msb[0]);
731 	newval |= (currval & ~(param->mask[0] << param->shift[0]));
732 	data->reg[param->msb[0]] = newval;
733 	write_byte(client, param->msb[0], newval);
734 	mutex_unlock(&data->update_lock);
735 	return count;
736 }
737 
738 static const u32 asc7621_temp_smoothing_time_map[] = {
739 	35000, 17600, 11800, 7000, 4400, 3000, 1600, 800
740 };
741 
show_temp_st(struct device * dev,struct device_attribute * attr,char * buf)742 static ssize_t show_temp_st(struct device *dev,
743 			    struct device_attribute *attr, char *buf)
744 {
745 	SETUP_SHOW_DATA_PARAM(dev, attr);
746 	u8 regval =
747 	    (data->reg[param->msb[0]] >> param->shift[0]) & param->mask[0];
748 	regval = clamp_val(regval, 0, 7);
749 
750 	return sprintf(buf, "%u\n", asc7621_temp_smoothing_time_map[regval]);
751 }
752 
store_temp_st(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)753 static ssize_t store_temp_st(struct device *dev,
754 			     struct device_attribute *attr,
755 			     const char *buf, size_t count)
756 {
757 	SETUP_STORE_DATA_PARAM(dev, attr);
758 	long reqval;
759 	u8 currval, newval = 255;
760 	u32 i;
761 
762 	if (kstrtol(buf, 10, &reqval))
763 		return -EINVAL;
764 
765 	for (i = 0; i < ARRAY_SIZE(asc7621_temp_smoothing_time_map); i++) {
766 		if (reqval == asc7621_temp_smoothing_time_map[i]) {
767 			newval = i;
768 			break;
769 		}
770 	}
771 
772 	if (newval == 255)
773 		return -EINVAL;
774 
775 	newval = (newval & param->mask[0]) << param->shift[0];
776 
777 	mutex_lock(&data->update_lock);
778 	currval = read_byte(client, param->msb[0]);
779 	newval |= (currval & ~(param->mask[0] << param->shift[0]));
780 	data->reg[param->msb[0]] = newval;
781 	write_byte(client, param->msb[0], newval);
782 	mutex_unlock(&data->update_lock);
783 	return count;
784 }
785 
786 /*
787  * End of data handlers
788  *
789  * These defines do nothing more than make the table easier
790  * to read when wrapped at column 80.
791  */
792 
793 /*
794  * Creates a variable length array inititalizer.
795  * VAA(1,3,5,7) would produce {1,3,5,7}
796  */
797 #define VAA(args...) {args}
798 
799 #define PREAD(name, n, pri, rm, rl, m, s, r) \
800 	{.sda = SENSOR_ATTR(name, S_IRUGO, show_##r, NULL, n), \
801 	  .priority = pri, .msb[0] = rm, .lsb[0] = rl, .mask[0] = m, \
802 	  .shift[0] = s,}
803 
804 #define PWRITE(name, n, pri, rm, rl, m, s, r) \
805 	{.sda = SENSOR_ATTR(name, S_IRUGO | S_IWUSR, show_##r, store_##r, n), \
806 	  .priority = pri, .msb[0] = rm, .lsb[0] = rl, .mask[0] = m, \
807 	  .shift[0] = s,}
808 
809 /*
810  * PWRITEM assumes that the initializers for the .msb, .lsb, .mask and .shift
811  * were created using the VAA macro.
812  */
813 #define PWRITEM(name, n, pri, rm, rl, m, s, r) \
814 	{.sda = SENSOR_ATTR(name, S_IRUGO | S_IWUSR, show_##r, store_##r, n), \
815 	  .priority = pri, .msb = rm, .lsb = rl, .mask = m, .shift = s,}
816 
817 static struct asc7621_param asc7621_params[] = {
818 	PREAD(in0_input, 0, PRI_HIGH, 0x20, 0x13, 0, 0, in10),
819 	PREAD(in1_input, 1, PRI_HIGH, 0x21, 0x18, 0, 0, in10),
820 	PREAD(in2_input, 2, PRI_HIGH, 0x22, 0x11, 0, 0, in10),
821 	PREAD(in3_input, 3, PRI_HIGH, 0x23, 0x12, 0, 0, in10),
822 	PREAD(in4_input, 4, PRI_HIGH, 0x24, 0x14, 0, 0, in10),
823 
824 	PWRITE(in0_min, 0, PRI_LOW, 0x44, 0, 0, 0, in8),
825 	PWRITE(in1_min, 1, PRI_LOW, 0x46, 0, 0, 0, in8),
826 	PWRITE(in2_min, 2, PRI_LOW, 0x48, 0, 0, 0, in8),
827 	PWRITE(in3_min, 3, PRI_LOW, 0x4a, 0, 0, 0, in8),
828 	PWRITE(in4_min, 4, PRI_LOW, 0x4c, 0, 0, 0, in8),
829 
830 	PWRITE(in0_max, 0, PRI_LOW, 0x45, 0, 0, 0, in8),
831 	PWRITE(in1_max, 1, PRI_LOW, 0x47, 0, 0, 0, in8),
832 	PWRITE(in2_max, 2, PRI_LOW, 0x49, 0, 0, 0, in8),
833 	PWRITE(in3_max, 3, PRI_LOW, 0x4b, 0, 0, 0, in8),
834 	PWRITE(in4_max, 4, PRI_LOW, 0x4d, 0, 0, 0, in8),
835 
836 	PREAD(in0_alarm, 0, PRI_HIGH, 0x41, 0, 0x01, 0, bitmask),
837 	PREAD(in1_alarm, 1, PRI_HIGH, 0x41, 0, 0x01, 1, bitmask),
838 	PREAD(in2_alarm, 2, PRI_HIGH, 0x41, 0, 0x01, 2, bitmask),
839 	PREAD(in3_alarm, 3, PRI_HIGH, 0x41, 0, 0x01, 3, bitmask),
840 	PREAD(in4_alarm, 4, PRI_HIGH, 0x42, 0, 0x01, 0, bitmask),
841 
842 	PREAD(fan1_input, 0, PRI_HIGH, 0x29, 0x28, 0, 0, fan16),
843 	PREAD(fan2_input, 1, PRI_HIGH, 0x2b, 0x2a, 0, 0, fan16),
844 	PREAD(fan3_input, 2, PRI_HIGH, 0x2d, 0x2c, 0, 0, fan16),
845 	PREAD(fan4_input, 3, PRI_HIGH, 0x2f, 0x2e, 0, 0, fan16),
846 
847 	PWRITE(fan1_min, 0, PRI_LOW, 0x55, 0x54, 0, 0, fan16),
848 	PWRITE(fan2_min, 1, PRI_LOW, 0x57, 0x56, 0, 0, fan16),
849 	PWRITE(fan3_min, 2, PRI_LOW, 0x59, 0x58, 0, 0, fan16),
850 	PWRITE(fan4_min, 3, PRI_LOW, 0x5b, 0x5a, 0, 0, fan16),
851 
852 	PREAD(fan1_alarm, 0, PRI_HIGH, 0x42, 0, 0x01, 2, bitmask),
853 	PREAD(fan2_alarm, 1, PRI_HIGH, 0x42, 0, 0x01, 3, bitmask),
854 	PREAD(fan3_alarm, 2, PRI_HIGH, 0x42, 0, 0x01, 4, bitmask),
855 	PREAD(fan4_alarm, 3, PRI_HIGH, 0x42, 0, 0x01, 5, bitmask),
856 
857 	PREAD(temp1_input, 0, PRI_HIGH, 0x25, 0x10, 0, 0, temp10),
858 	PREAD(temp2_input, 1, PRI_HIGH, 0x26, 0x15, 0, 0, temp10),
859 	PREAD(temp3_input, 2, PRI_HIGH, 0x27, 0x16, 0, 0, temp10),
860 	PREAD(temp4_input, 3, PRI_HIGH, 0x33, 0x17, 0, 0, temp10),
861 	PREAD(temp5_input, 4, PRI_HIGH, 0xf7, 0xf6, 0, 0, temp10),
862 	PREAD(temp6_input, 5, PRI_HIGH, 0xf9, 0xf8, 0, 0, temp10),
863 	PREAD(temp7_input, 6, PRI_HIGH, 0xfb, 0xfa, 0, 0, temp10),
864 	PREAD(temp8_input, 7, PRI_HIGH, 0xfd, 0xfc, 0, 0, temp10),
865 
866 	PWRITE(temp1_min, 0, PRI_LOW, 0x4e, 0, 0, 0, temp8),
867 	PWRITE(temp2_min, 1, PRI_LOW, 0x50, 0, 0, 0, temp8),
868 	PWRITE(temp3_min, 2, PRI_LOW, 0x52, 0, 0, 0, temp8),
869 	PWRITE(temp4_min, 3, PRI_LOW, 0x34, 0, 0, 0, temp8),
870 
871 	PWRITE(temp1_max, 0, PRI_LOW, 0x4f, 0, 0, 0, temp8),
872 	PWRITE(temp2_max, 1, PRI_LOW, 0x51, 0, 0, 0, temp8),
873 	PWRITE(temp3_max, 2, PRI_LOW, 0x53, 0, 0, 0, temp8),
874 	PWRITE(temp4_max, 3, PRI_LOW, 0x35, 0, 0, 0, temp8),
875 
876 	PREAD(temp1_alarm, 0, PRI_HIGH, 0x41, 0, 0x01, 4, bitmask),
877 	PREAD(temp2_alarm, 1, PRI_HIGH, 0x41, 0, 0x01, 5, bitmask),
878 	PREAD(temp3_alarm, 2, PRI_HIGH, 0x41, 0, 0x01, 6, bitmask),
879 	PREAD(temp4_alarm, 3, PRI_HIGH, 0x43, 0, 0x01, 0, bitmask),
880 
881 	PWRITE(temp1_source, 0, PRI_LOW, 0x02, 0, 0x07, 4, bitmask),
882 	PWRITE(temp2_source, 1, PRI_LOW, 0x02, 0, 0x07, 0, bitmask),
883 	PWRITE(temp3_source, 2, PRI_LOW, 0x03, 0, 0x07, 4, bitmask),
884 	PWRITE(temp4_source, 3, PRI_LOW, 0x03, 0, 0x07, 0, bitmask),
885 
886 	PWRITE(temp1_smoothing_enable, 0, PRI_LOW, 0x62, 0, 0x01, 3, bitmask),
887 	PWRITE(temp2_smoothing_enable, 1, PRI_LOW, 0x63, 0, 0x01, 7, bitmask),
888 	PWRITE(temp3_smoothing_enable, 2, PRI_LOW, 0x63, 0, 0x01, 3, bitmask),
889 	PWRITE(temp4_smoothing_enable, 3, PRI_LOW, 0x3c, 0, 0x01, 3, bitmask),
890 
891 	PWRITE(temp1_smoothing_time, 0, PRI_LOW, 0x62, 0, 0x07, 0, temp_st),
892 	PWRITE(temp2_smoothing_time, 1, PRI_LOW, 0x63, 0, 0x07, 4, temp_st),
893 	PWRITE(temp3_smoothing_time, 2, PRI_LOW, 0x63, 0, 0x07, 0, temp_st),
894 	PWRITE(temp4_smoothing_time, 3, PRI_LOW, 0x3c, 0, 0x07, 0, temp_st),
895 
896 	PWRITE(temp1_auto_point1_temp_hyst, 0, PRI_LOW, 0x6d, 0, 0x0f, 4,
897 	       bitmask),
898 	PWRITE(temp2_auto_point1_temp_hyst, 1, PRI_LOW, 0x6d, 0, 0x0f, 0,
899 	       bitmask),
900 	PWRITE(temp3_auto_point1_temp_hyst, 2, PRI_LOW, 0x6e, 0, 0x0f, 4,
901 	       bitmask),
902 	PWRITE(temp4_auto_point1_temp_hyst, 3, PRI_LOW, 0x6e, 0, 0x0f, 0,
903 	       bitmask),
904 
905 	PREAD(temp1_auto_point2_temp_hyst, 0, PRI_LOW, 0x6d, 0, 0x0f, 4,
906 	      bitmask),
907 	PREAD(temp2_auto_point2_temp_hyst, 1, PRI_LOW, 0x6d, 0, 0x0f, 0,
908 	      bitmask),
909 	PREAD(temp3_auto_point2_temp_hyst, 2, PRI_LOW, 0x6e, 0, 0x0f, 4,
910 	      bitmask),
911 	PREAD(temp4_auto_point2_temp_hyst, 3, PRI_LOW, 0x6e, 0, 0x0f, 0,
912 	      bitmask),
913 
914 	PWRITE(temp1_auto_point1_temp, 0, PRI_LOW, 0x67, 0, 0, 0, temp8),
915 	PWRITE(temp2_auto_point1_temp, 1, PRI_LOW, 0x68, 0, 0, 0, temp8),
916 	PWRITE(temp3_auto_point1_temp, 2, PRI_LOW, 0x69, 0, 0, 0, temp8),
917 	PWRITE(temp4_auto_point1_temp, 3, PRI_LOW, 0x3b, 0, 0, 0, temp8),
918 
919 	PWRITEM(temp1_auto_point2_temp, 0, PRI_LOW, VAA(0x5f, 0x67), VAA(0),
920 		VAA(0x0f), VAA(4), ap2_temp),
921 	PWRITEM(temp2_auto_point2_temp, 1, PRI_LOW, VAA(0x60, 0x68), VAA(0),
922 		VAA(0x0f), VAA(4), ap2_temp),
923 	PWRITEM(temp3_auto_point2_temp, 2, PRI_LOW, VAA(0x61, 0x69), VAA(0),
924 		VAA(0x0f), VAA(4), ap2_temp),
925 	PWRITEM(temp4_auto_point2_temp, 3, PRI_LOW, VAA(0x3c, 0x3b), VAA(0),
926 		VAA(0x0f), VAA(4), ap2_temp),
927 
928 	PWRITE(temp1_crit, 0, PRI_LOW, 0x6a, 0, 0, 0, temp8),
929 	PWRITE(temp2_crit, 1, PRI_LOW, 0x6b, 0, 0, 0, temp8),
930 	PWRITE(temp3_crit, 2, PRI_LOW, 0x6c, 0, 0, 0, temp8),
931 	PWRITE(temp4_crit, 3, PRI_LOW, 0x3d, 0, 0, 0, temp8),
932 
933 	PWRITE(temp5_enable, 4, PRI_LOW, 0x0e, 0, 0x01, 0, bitmask),
934 	PWRITE(temp6_enable, 5, PRI_LOW, 0x0e, 0, 0x01, 1, bitmask),
935 	PWRITE(temp7_enable, 6, PRI_LOW, 0x0e, 0, 0x01, 2, bitmask),
936 	PWRITE(temp8_enable, 7, PRI_LOW, 0x0e, 0, 0x01, 3, bitmask),
937 
938 	PWRITE(remote1_offset, 0, PRI_LOW, 0x1c, 0, 0, 0, temp62),
939 	PWRITE(remote2_offset, 1, PRI_LOW, 0x1d, 0, 0, 0, temp62),
940 
941 	PWRITE(pwm1, 0, PRI_HIGH, 0x30, 0, 0, 0, u8),
942 	PWRITE(pwm2, 1, PRI_HIGH, 0x31, 0, 0, 0, u8),
943 	PWRITE(pwm3, 2, PRI_HIGH, 0x32, 0, 0, 0, u8),
944 
945 	PWRITE(pwm1_invert, 0, PRI_LOW, 0x5c, 0, 0x01, 4, bitmask),
946 	PWRITE(pwm2_invert, 1, PRI_LOW, 0x5d, 0, 0x01, 4, bitmask),
947 	PWRITE(pwm3_invert, 2, PRI_LOW, 0x5e, 0, 0x01, 4, bitmask),
948 
949 	PWRITEM(pwm1_enable, 0, PRI_LOW, VAA(0x5c, 0x5c, 0x62), VAA(0, 0, 0),
950 		VAA(0x07, 0x01, 0x01), VAA(5, 3, 5), pwm_enable),
951 	PWRITEM(pwm2_enable, 1, PRI_LOW, VAA(0x5d, 0x5d, 0x62), VAA(0, 0, 0),
952 		VAA(0x07, 0x01, 0x01), VAA(5, 3, 6), pwm_enable),
953 	PWRITEM(pwm3_enable, 2, PRI_LOW, VAA(0x5e, 0x5e, 0x62), VAA(0, 0, 0),
954 		VAA(0x07, 0x01, 0x01), VAA(5, 3, 7), pwm_enable),
955 
956 	PWRITEM(pwm1_auto_channels, 0, PRI_LOW, VAA(0x5c, 0x5c), VAA(0, 0),
957 		VAA(0x07, 0x01), VAA(5, 3), pwm_ac),
958 	PWRITEM(pwm2_auto_channels, 1, PRI_LOW, VAA(0x5d, 0x5d), VAA(0, 0),
959 		VAA(0x07, 0x01), VAA(5, 3), pwm_ac),
960 	PWRITEM(pwm3_auto_channels, 2, PRI_LOW, VAA(0x5e, 0x5e), VAA(0, 0),
961 		VAA(0x07, 0x01), VAA(5, 3), pwm_ac),
962 
963 	PWRITE(pwm1_auto_point1_pwm, 0, PRI_LOW, 0x64, 0, 0, 0, u8),
964 	PWRITE(pwm2_auto_point1_pwm, 1, PRI_LOW, 0x65, 0, 0, 0, u8),
965 	PWRITE(pwm3_auto_point1_pwm, 2, PRI_LOW, 0x66, 0, 0, 0, u8),
966 
967 	PWRITE(pwm1_auto_point2_pwm, 0, PRI_LOW, 0x38, 0, 0, 0, u8),
968 	PWRITE(pwm2_auto_point2_pwm, 1, PRI_LOW, 0x39, 0, 0, 0, u8),
969 	PWRITE(pwm3_auto_point2_pwm, 2, PRI_LOW, 0x3a, 0, 0, 0, u8),
970 
971 	PWRITE(pwm1_freq, 0, PRI_LOW, 0x5f, 0, 0x0f, 0, pwm_freq),
972 	PWRITE(pwm2_freq, 1, PRI_LOW, 0x60, 0, 0x0f, 0, pwm_freq),
973 	PWRITE(pwm3_freq, 2, PRI_LOW, 0x61, 0, 0x0f, 0, pwm_freq),
974 
975 	PREAD(pwm1_auto_zone_assigned, 0, PRI_LOW, 0, 0, 0x03, 2, bitmask),
976 	PREAD(pwm2_auto_zone_assigned, 1, PRI_LOW, 0, 0, 0x03, 4, bitmask),
977 	PREAD(pwm3_auto_zone_assigned, 2, PRI_LOW, 0, 0, 0x03, 6, bitmask),
978 
979 	PWRITE(pwm1_auto_spinup_time, 0, PRI_LOW, 0x5c, 0, 0x07, 0, pwm_ast),
980 	PWRITE(pwm2_auto_spinup_time, 1, PRI_LOW, 0x5d, 0, 0x07, 0, pwm_ast),
981 	PWRITE(pwm3_auto_spinup_time, 2, PRI_LOW, 0x5e, 0, 0x07, 0, pwm_ast),
982 
983 	PWRITE(peci_enable, 0, PRI_LOW, 0x40, 0, 0x01, 4, bitmask),
984 	PWRITE(peci_avg, 0, PRI_LOW, 0x36, 0, 0x07, 0, bitmask),
985 	PWRITE(peci_domain, 0, PRI_LOW, 0x36, 0, 0x01, 3, bitmask),
986 	PWRITE(peci_legacy, 0, PRI_LOW, 0x36, 0, 0x01, 4, bitmask),
987 	PWRITE(peci_diode, 0, PRI_LOW, 0x0e, 0, 0x07, 4, bitmask),
988 	PWRITE(peci_4domain, 0, PRI_LOW, 0x0e, 0, 0x01, 4, bitmask),
989 
990 };
991 
asc7621_update_device(struct device * dev)992 static struct asc7621_data *asc7621_update_device(struct device *dev)
993 {
994 	struct i2c_client *client = to_i2c_client(dev);
995 	struct asc7621_data *data = i2c_get_clientdata(client);
996 	int i;
997 
998 /*
999  * The asc7621 chips guarantee consistent reads of multi-byte values
1000  * regardless of the order of the reads.  No special logic is needed
1001  * so we can just read the registers in whatever  order they appear
1002  * in the asc7621_params array.
1003  */
1004 
1005 	mutex_lock(&data->update_lock);
1006 
1007 	/* Read all the high priority registers */
1008 
1009 	if (!data->valid ||
1010 	    time_after(jiffies, data->last_high_reading + INTERVAL_HIGH)) {
1011 
1012 		for (i = 0; i < ARRAY_SIZE(asc7621_register_priorities); i++) {
1013 			if (asc7621_register_priorities[i] == PRI_HIGH) {
1014 				data->reg[i] =
1015 				    i2c_smbus_read_byte_data(client, i) & 0xff;
1016 			}
1017 		}
1018 		data->last_high_reading = jiffies;
1019 	}			/* last_reading */
1020 
1021 	/* Read all the low priority registers. */
1022 
1023 	if (!data->valid ||
1024 	    time_after(jiffies, data->last_low_reading + INTERVAL_LOW)) {
1025 
1026 		for (i = 0; i < ARRAY_SIZE(asc7621_params); i++) {
1027 			if (asc7621_register_priorities[i] == PRI_LOW) {
1028 				data->reg[i] =
1029 				    i2c_smbus_read_byte_data(client, i) & 0xff;
1030 			}
1031 		}
1032 		data->last_low_reading = jiffies;
1033 	}			/* last_reading */
1034 
1035 	data->valid = true;
1036 
1037 	mutex_unlock(&data->update_lock);
1038 
1039 	return data;
1040 }
1041 
1042 /*
1043  * Standard detection and initialization below
1044  *
1045  * Helper function that checks if an address is valid
1046  * for a particular chip.
1047  */
1048 
valid_address_for_chip(int chip_type,int address)1049 static inline int valid_address_for_chip(int chip_type, int address)
1050 {
1051 	int i;
1052 
1053 	for (i = 0; asc7621_chips[chip_type].addresses[i] != I2C_CLIENT_END;
1054 	     i++) {
1055 		if (asc7621_chips[chip_type].addresses[i] == address)
1056 			return 1;
1057 	}
1058 	return 0;
1059 }
1060 
asc7621_init_client(struct i2c_client * client)1061 static void asc7621_init_client(struct i2c_client *client)
1062 {
1063 	int value;
1064 
1065 	/* Warn if part was not "READY" */
1066 
1067 	value = read_byte(client, 0x40);
1068 
1069 	if (value & 0x02) {
1070 		dev_err(&client->dev,
1071 			"Client (%d,0x%02x) config is locked.\n",
1072 			i2c_adapter_id(client->adapter), client->addr);
1073 	}
1074 	if (!(value & 0x04)) {
1075 		dev_err(&client->dev, "Client (%d,0x%02x) is not ready.\n",
1076 			i2c_adapter_id(client->adapter), client->addr);
1077 	}
1078 
1079 /*
1080  * Start monitoring
1081  *
1082  * Try to clear LOCK, Set START, save everything else
1083  */
1084 	value = (value & ~0x02) | 0x01;
1085 	write_byte(client, 0x40, value & 0xff);
1086 
1087 }
1088 
1089 static int
asc7621_probe(struct i2c_client * client)1090 asc7621_probe(struct i2c_client *client)
1091 {
1092 	struct asc7621_data *data;
1093 	int i, err;
1094 
1095 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1096 		return -EIO;
1097 
1098 	data = devm_kzalloc(&client->dev, sizeof(struct asc7621_data),
1099 			    GFP_KERNEL);
1100 	if (data == NULL)
1101 		return -ENOMEM;
1102 
1103 	i2c_set_clientdata(client, data);
1104 	mutex_init(&data->update_lock);
1105 
1106 	/* Initialize the asc7621 chip */
1107 	asc7621_init_client(client);
1108 
1109 	/* Create the sysfs entries */
1110 	for (i = 0; i < ARRAY_SIZE(asc7621_params); i++) {
1111 		err =
1112 		    device_create_file(&client->dev,
1113 				       &(asc7621_params[i].sda.dev_attr));
1114 		if (err)
1115 			goto exit_remove;
1116 	}
1117 
1118 	data->class_dev = hwmon_device_register(&client->dev);
1119 	if (IS_ERR(data->class_dev)) {
1120 		err = PTR_ERR(data->class_dev);
1121 		goto exit_remove;
1122 	}
1123 
1124 	return 0;
1125 
1126 exit_remove:
1127 	for (i = 0; i < ARRAY_SIZE(asc7621_params); i++) {
1128 		device_remove_file(&client->dev,
1129 				   &(asc7621_params[i].sda.dev_attr));
1130 	}
1131 
1132 	return err;
1133 }
1134 
asc7621_detect(struct i2c_client * client,struct i2c_board_info * info)1135 static int asc7621_detect(struct i2c_client *client,
1136 			  struct i2c_board_info *info)
1137 {
1138 	struct i2c_adapter *adapter = client->adapter;
1139 	int company, verstep, chip_index;
1140 
1141 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1142 		return -ENODEV;
1143 
1144 	for (chip_index = FIRST_CHIP; chip_index <= LAST_CHIP; chip_index++) {
1145 
1146 		if (!valid_address_for_chip(chip_index, client->addr))
1147 			continue;
1148 
1149 		company = read_byte(client,
1150 			asc7621_chips[chip_index].company_reg);
1151 		verstep = read_byte(client,
1152 			asc7621_chips[chip_index].verstep_reg);
1153 
1154 		if (company == asc7621_chips[chip_index].company_id &&
1155 		    verstep == asc7621_chips[chip_index].verstep_id) {
1156 			strscpy(info->type, asc7621_chips[chip_index].name,
1157 				I2C_NAME_SIZE);
1158 
1159 			dev_info(&adapter->dev, "Matched %s at 0x%02x\n",
1160 				 asc7621_chips[chip_index].name, client->addr);
1161 			return 0;
1162 		}
1163 	}
1164 
1165 	return -ENODEV;
1166 }
1167 
asc7621_remove(struct i2c_client * client)1168 static void asc7621_remove(struct i2c_client *client)
1169 {
1170 	struct asc7621_data *data = i2c_get_clientdata(client);
1171 	int i;
1172 
1173 	hwmon_device_unregister(data->class_dev);
1174 
1175 	for (i = 0; i < ARRAY_SIZE(asc7621_params); i++) {
1176 		device_remove_file(&client->dev,
1177 				   &(asc7621_params[i].sda.dev_attr));
1178 	}
1179 }
1180 
1181 static const struct i2c_device_id asc7621_id[] = {
1182 	{"asc7621", asc7621},
1183 	{"asc7621a", asc7621a},
1184 	{},
1185 };
1186 
1187 MODULE_DEVICE_TABLE(i2c, asc7621_id);
1188 
1189 static struct i2c_driver asc7621_driver = {
1190 	.class = I2C_CLASS_HWMON,
1191 	.driver = {
1192 		.name = "asc7621",
1193 	},
1194 	.probe = asc7621_probe,
1195 	.remove = asc7621_remove,
1196 	.id_table = asc7621_id,
1197 	.detect = asc7621_detect,
1198 	.address_list = normal_i2c,
1199 };
1200 
sm_asc7621_init(void)1201 static int __init sm_asc7621_init(void)
1202 {
1203 	int i, j;
1204 /*
1205  * Collect all the registers needed into a single array.
1206  * This way, if a register isn't actually used for anything,
1207  * we don't retrieve it.
1208  */
1209 
1210 	for (i = 0; i < ARRAY_SIZE(asc7621_params); i++) {
1211 		for (j = 0; j < ARRAY_SIZE(asc7621_params[i].msb); j++)
1212 			asc7621_register_priorities[asc7621_params[i].msb[j]] =
1213 			    asc7621_params[i].priority;
1214 		for (j = 0; j < ARRAY_SIZE(asc7621_params[i].lsb); j++)
1215 			asc7621_register_priorities[asc7621_params[i].lsb[j]] =
1216 			    asc7621_params[i].priority;
1217 	}
1218 	return i2c_add_driver(&asc7621_driver);
1219 }
1220 
sm_asc7621_exit(void)1221 static void __exit sm_asc7621_exit(void)
1222 {
1223 	i2c_del_driver(&asc7621_driver);
1224 }
1225 
1226 MODULE_LICENSE("GPL");
1227 MODULE_AUTHOR("George Joseph");
1228 MODULE_DESCRIPTION("Andigilog aSC7621 and aSC7621a driver");
1229 
1230 module_init(sm_asc7621_init);
1231 module_exit(sm_asc7621_exit);
1232