1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * smsc47m192.c - Support for hardware monitoring block of
4  *		  SMSC LPC47M192 and compatible Super I/O chips
5  *
6  * Copyright (C) 2006  Hartmut Rick <linux@rick.claranet.de>
7  *
8  * Derived from lm78.c and other chip drivers.
9  */
10 
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/jiffies.h>
15 #include <linux/i2c.h>
16 #include <linux/hwmon.h>
17 #include <linux/hwmon-sysfs.h>
18 #include <linux/hwmon-vid.h>
19 #include <linux/err.h>
20 #include <linux/sysfs.h>
21 #include <linux/mutex.h>
22 
23 /* Addresses to scan */
24 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
25 
26 /* SMSC47M192 registers */
27 #define SMSC47M192_REG_IN(nr)		((nr) < 6 ? (0x20 + (nr)) : \
28 					(0x50 + (nr) - 6))
29 #define SMSC47M192_REG_IN_MAX(nr)	((nr) < 6 ? (0x2b + (nr) * 2) : \
30 					(0x54 + (((nr) - 6) * 2)))
31 #define SMSC47M192_REG_IN_MIN(nr)	((nr) < 6 ? (0x2c + (nr) * 2) : \
32 					(0x55 + (((nr) - 6) * 2)))
33 static u8 SMSC47M192_REG_TEMP[3] =	{ 0x27, 0x26, 0x52 };
34 static u8 SMSC47M192_REG_TEMP_MAX[3] =	{ 0x39, 0x37, 0x58 };
35 static u8 SMSC47M192_REG_TEMP_MIN[3] =	{ 0x3A, 0x38, 0x59 };
36 #define SMSC47M192_REG_TEMP_OFFSET(nr)	((nr) == 2 ? 0x1e : 0x1f)
37 #define SMSC47M192_REG_ALARM1		0x41
38 #define SMSC47M192_REG_ALARM2		0x42
39 #define SMSC47M192_REG_VID		0x47
40 #define SMSC47M192_REG_VID4		0x49
41 #define SMSC47M192_REG_CONFIG		0x40
42 #define SMSC47M192_REG_SFR		0x4f
43 #define SMSC47M192_REG_COMPANY_ID	0x3e
44 #define SMSC47M192_REG_VERSION		0x3f
45 
46 /* generalised scaling with integer rounding */
SCALE(long val,int mul,int div)47 static inline int SCALE(long val, int mul, int div)
48 {
49 	if (val < 0)
50 		return (val * mul - div / 2) / div;
51 	else
52 		return (val * mul + div / 2) / div;
53 }
54 
55 /* Conversions */
56 
57 /* smsc47m192 internally scales voltage measurements */
58 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
59 
IN_FROM_REG(u8 reg,int n)60 static inline unsigned int IN_FROM_REG(u8 reg, int n)
61 {
62 	return SCALE(reg, nom_mv[n], 192);
63 }
64 
IN_TO_REG(unsigned long val,int n)65 static inline u8 IN_TO_REG(unsigned long val, int n)
66 {
67 	val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
68 	return SCALE(val, 192, nom_mv[n]);
69 }
70 
71 /*
72  * TEMP: 0.001 degC units (-128C to +127C)
73  * REG: 1C/bit, two's complement
74  */
TEMP_TO_REG(long val)75 static inline s8 TEMP_TO_REG(long val)
76 {
77 	return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
78 }
79 
TEMP_FROM_REG(s8 val)80 static inline int TEMP_FROM_REG(s8 val)
81 {
82 	return val * 1000;
83 }
84 
85 struct smsc47m192_data {
86 	struct i2c_client *client;
87 	const struct attribute_group *groups[3];
88 	struct mutex update_lock;
89 	bool valid;		/* true if following fields are valid */
90 	unsigned long last_updated;	/* In jiffies */
91 
92 	u8 in[8];		/* Register value */
93 	u8 in_max[8];		/* Register value */
94 	u8 in_min[8];		/* Register value */
95 	s8 temp[3];		/* Register value */
96 	s8 temp_max[3];		/* Register value */
97 	s8 temp_min[3];		/* Register value */
98 	s8 temp_offset[3];	/* Register value */
99 	u16 alarms;		/* Register encoding, combined */
100 	u8 vid;			/* Register encoding, combined */
101 	u8 vrm;
102 };
103 
smsc47m192_update_device(struct device * dev)104 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
105 {
106 	struct smsc47m192_data *data = dev_get_drvdata(dev);
107 	struct i2c_client *client = data->client;
108 	int i, config;
109 
110 	mutex_lock(&data->update_lock);
111 
112 	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
113 	 || !data->valid) {
114 		u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
115 
116 		dev_dbg(&client->dev, "Starting smsc47m192 update\n");
117 
118 		for (i = 0; i <= 7; i++) {
119 			data->in[i] = i2c_smbus_read_byte_data(client,
120 						SMSC47M192_REG_IN(i));
121 			data->in_min[i] = i2c_smbus_read_byte_data(client,
122 						SMSC47M192_REG_IN_MIN(i));
123 			data->in_max[i] = i2c_smbus_read_byte_data(client,
124 						SMSC47M192_REG_IN_MAX(i));
125 		}
126 		for (i = 0; i < 3; i++) {
127 			data->temp[i] = i2c_smbus_read_byte_data(client,
128 						SMSC47M192_REG_TEMP[i]);
129 			data->temp_max[i] = i2c_smbus_read_byte_data(client,
130 						SMSC47M192_REG_TEMP_MAX[i]);
131 			data->temp_min[i] = i2c_smbus_read_byte_data(client,
132 						SMSC47M192_REG_TEMP_MIN[i]);
133 		}
134 		for (i = 1; i < 3; i++)
135 			data->temp_offset[i] = i2c_smbus_read_byte_data(client,
136 						SMSC47M192_REG_TEMP_OFFSET(i));
137 		/*
138 		 * first offset is temp_offset[0] if SFR bit 4 is set,
139 		 * temp_offset[1] otherwise
140 		 */
141 		if (sfr & 0x10) {
142 			data->temp_offset[0] = data->temp_offset[1];
143 			data->temp_offset[1] = 0;
144 		} else
145 			data->temp_offset[0] = 0;
146 
147 		data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
148 			    & 0x0f;
149 		config = i2c_smbus_read_byte_data(client,
150 						  SMSC47M192_REG_CONFIG);
151 		if (config & 0x20)
152 			data->vid |= (i2c_smbus_read_byte_data(client,
153 					SMSC47M192_REG_VID4) & 0x01) << 4;
154 		data->alarms = i2c_smbus_read_byte_data(client,
155 						SMSC47M192_REG_ALARM1) |
156 			       (i2c_smbus_read_byte_data(client,
157 						SMSC47M192_REG_ALARM2) << 8);
158 
159 		data->last_updated = jiffies;
160 		data->valid = true;
161 	}
162 
163 	mutex_unlock(&data->update_lock);
164 
165 	return data;
166 }
167 
168 /* Voltages */
in_show(struct device * dev,struct device_attribute * attr,char * buf)169 static ssize_t in_show(struct device *dev, struct device_attribute *attr,
170 		       char *buf)
171 {
172 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
173 	int nr = sensor_attr->index;
174 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
175 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
176 }
177 
in_min_show(struct device * dev,struct device_attribute * attr,char * buf)178 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
179 			   char *buf)
180 {
181 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
182 	int nr = sensor_attr->index;
183 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
184 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
185 }
186 
in_max_show(struct device * dev,struct device_attribute * attr,char * buf)187 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
188 			   char *buf)
189 {
190 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
191 	int nr = sensor_attr->index;
192 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
193 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
194 }
195 
in_min_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)196 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
197 			    const char *buf, size_t count)
198 {
199 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
200 	int nr = sensor_attr->index;
201 	struct smsc47m192_data *data = dev_get_drvdata(dev);
202 	struct i2c_client *client = data->client;
203 	unsigned long val;
204 	int err;
205 
206 	err = kstrtoul(buf, 10, &val);
207 	if (err)
208 		return err;
209 
210 	mutex_lock(&data->update_lock);
211 	data->in_min[nr] = IN_TO_REG(val, nr);
212 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
213 							data->in_min[nr]);
214 	mutex_unlock(&data->update_lock);
215 	return count;
216 }
217 
in_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)218 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
219 			    const char *buf, size_t count)
220 {
221 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
222 	int nr = sensor_attr->index;
223 	struct smsc47m192_data *data = dev_get_drvdata(dev);
224 	struct i2c_client *client = data->client;
225 	unsigned long val;
226 	int err;
227 
228 	err = kstrtoul(buf, 10, &val);
229 	if (err)
230 		return err;
231 
232 	mutex_lock(&data->update_lock);
233 	data->in_max[nr] = IN_TO_REG(val, nr);
234 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
235 							data->in_max[nr]);
236 	mutex_unlock(&data->update_lock);
237 	return count;
238 }
239 
240 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
241 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
242 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
243 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
244 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
245 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
246 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
247 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
248 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
249 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
250 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
251 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
252 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
253 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
254 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
255 static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
256 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
257 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
258 static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6);
259 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
260 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
261 static SENSOR_DEVICE_ATTR_RO(in7_input, in, 7);
262 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
263 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
264 
265 /* Temperatures */
temp_show(struct device * dev,struct device_attribute * attr,char * buf)266 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
267 			 char *buf)
268 {
269 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
270 	int nr = sensor_attr->index;
271 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
272 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
273 }
274 
temp_min_show(struct device * dev,struct device_attribute * attr,char * buf)275 static ssize_t temp_min_show(struct device *dev,
276 			     struct device_attribute *attr, char *buf)
277 {
278 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
279 	int nr = sensor_attr->index;
280 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
281 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
282 }
283 
temp_max_show(struct device * dev,struct device_attribute * attr,char * buf)284 static ssize_t temp_max_show(struct device *dev,
285 			     struct device_attribute *attr, char *buf)
286 {
287 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
288 	int nr = sensor_attr->index;
289 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
290 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
291 }
292 
temp_min_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)293 static ssize_t temp_min_store(struct device *dev,
294 			      struct device_attribute *attr, const char *buf,
295 			      size_t count)
296 {
297 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
298 	int nr = sensor_attr->index;
299 	struct smsc47m192_data *data = dev_get_drvdata(dev);
300 	struct i2c_client *client = data->client;
301 	long val;
302 	int err;
303 
304 	err = kstrtol(buf, 10, &val);
305 	if (err)
306 		return err;
307 
308 	mutex_lock(&data->update_lock);
309 	data->temp_min[nr] = TEMP_TO_REG(val);
310 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
311 						data->temp_min[nr]);
312 	mutex_unlock(&data->update_lock);
313 	return count;
314 }
315 
temp_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)316 static ssize_t temp_max_store(struct device *dev,
317 			      struct device_attribute *attr, const char *buf,
318 			      size_t count)
319 {
320 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
321 	int nr = sensor_attr->index;
322 	struct smsc47m192_data *data = dev_get_drvdata(dev);
323 	struct i2c_client *client = data->client;
324 	long val;
325 	int err;
326 
327 	err = kstrtol(buf, 10, &val);
328 	if (err)
329 		return err;
330 
331 	mutex_lock(&data->update_lock);
332 	data->temp_max[nr] = TEMP_TO_REG(val);
333 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
334 						data->temp_max[nr]);
335 	mutex_unlock(&data->update_lock);
336 	return count;
337 }
338 
temp_offset_show(struct device * dev,struct device_attribute * attr,char * buf)339 static ssize_t temp_offset_show(struct device *dev,
340 				struct device_attribute *attr, char *buf)
341 {
342 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
343 	int nr = sensor_attr->index;
344 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
345 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
346 }
347 
temp_offset_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)348 static ssize_t temp_offset_store(struct device *dev,
349 				 struct device_attribute *attr,
350 				 const char *buf, size_t count)
351 {
352 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
353 	int nr = sensor_attr->index;
354 	struct smsc47m192_data *data = dev_get_drvdata(dev);
355 	struct i2c_client *client = data->client;
356 	u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
357 	long val;
358 	int err;
359 
360 	err = kstrtol(buf, 10, &val);
361 	if (err)
362 		return err;
363 
364 	mutex_lock(&data->update_lock);
365 	data->temp_offset[nr] = TEMP_TO_REG(val);
366 	if (nr > 1)
367 		i2c_smbus_write_byte_data(client,
368 			SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
369 	else if (data->temp_offset[nr] != 0) {
370 		/*
371 		 * offset[0] and offset[1] share the same register,
372 		 * SFR bit 4 activates offset[0]
373 		 */
374 		i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
375 					(sfr & 0xef) | (nr == 0 ? 0x10 : 0));
376 		data->temp_offset[1-nr] = 0;
377 		i2c_smbus_write_byte_data(client,
378 			SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
379 	} else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
380 		i2c_smbus_write_byte_data(client,
381 					SMSC47M192_REG_TEMP_OFFSET(nr), 0);
382 	mutex_unlock(&data->update_lock);
383 	return count;
384 }
385 
386 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
387 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
388 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
389 static SENSOR_DEVICE_ATTR_RW(temp1_offset, temp_offset, 0);
390 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
391 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
392 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
393 static SENSOR_DEVICE_ATTR_RW(temp2_offset, temp_offset, 1);
394 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
395 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
396 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
397 static SENSOR_DEVICE_ATTR_RW(temp3_offset, temp_offset, 2);
398 
399 /* VID */
cpu0_vid_show(struct device * dev,struct device_attribute * attr,char * buf)400 static ssize_t cpu0_vid_show(struct device *dev,
401 			     struct device_attribute *attr, char *buf)
402 {
403 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
404 	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
405 }
406 static DEVICE_ATTR_RO(cpu0_vid);
407 
vrm_show(struct device * dev,struct device_attribute * attr,char * buf)408 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
409 		char *buf)
410 {
411 	struct smsc47m192_data *data = dev_get_drvdata(dev);
412 	return sprintf(buf, "%d\n", data->vrm);
413 }
414 
vrm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)415 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
416 			 const char *buf, size_t count)
417 {
418 	struct smsc47m192_data *data = dev_get_drvdata(dev);
419 	unsigned long val;
420 	int err;
421 
422 	err = kstrtoul(buf, 10, &val);
423 	if (err)
424 		return err;
425 	if (val > 255)
426 		return -EINVAL;
427 
428 	data->vrm = val;
429 	return count;
430 }
431 static DEVICE_ATTR_RW(vrm);
432 
433 /* Alarms */
alarm_show(struct device * dev,struct device_attribute * attr,char * buf)434 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
435 			  char *buf)
436 {
437 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
438 	int nr = sensor_attr->index;
439 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
440 	return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
441 }
442 
443 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0x0010);
444 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 0x0020);
445 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 0x0040);
446 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 0x4000);
447 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 0x8000);
448 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0x0001);
449 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 0x0002);
450 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 0x0004);
451 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 0x0008);
452 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 0x0100);
453 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 0x0200);
454 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 0x0400);
455 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 0x0800);
456 
457 static struct attribute *smsc47m192_attributes[] = {
458 	&sensor_dev_attr_in0_input.dev_attr.attr,
459 	&sensor_dev_attr_in0_min.dev_attr.attr,
460 	&sensor_dev_attr_in0_max.dev_attr.attr,
461 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
462 	&sensor_dev_attr_in1_input.dev_attr.attr,
463 	&sensor_dev_attr_in1_min.dev_attr.attr,
464 	&sensor_dev_attr_in1_max.dev_attr.attr,
465 	&sensor_dev_attr_in1_alarm.dev_attr.attr,
466 	&sensor_dev_attr_in2_input.dev_attr.attr,
467 	&sensor_dev_attr_in2_min.dev_attr.attr,
468 	&sensor_dev_attr_in2_max.dev_attr.attr,
469 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
470 	&sensor_dev_attr_in3_input.dev_attr.attr,
471 	&sensor_dev_attr_in3_min.dev_attr.attr,
472 	&sensor_dev_attr_in3_max.dev_attr.attr,
473 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
474 	&sensor_dev_attr_in5_input.dev_attr.attr,
475 	&sensor_dev_attr_in5_min.dev_attr.attr,
476 	&sensor_dev_attr_in5_max.dev_attr.attr,
477 	&sensor_dev_attr_in5_alarm.dev_attr.attr,
478 	&sensor_dev_attr_in6_input.dev_attr.attr,
479 	&sensor_dev_attr_in6_min.dev_attr.attr,
480 	&sensor_dev_attr_in6_max.dev_attr.attr,
481 	&sensor_dev_attr_in6_alarm.dev_attr.attr,
482 	&sensor_dev_attr_in7_input.dev_attr.attr,
483 	&sensor_dev_attr_in7_min.dev_attr.attr,
484 	&sensor_dev_attr_in7_max.dev_attr.attr,
485 	&sensor_dev_attr_in7_alarm.dev_attr.attr,
486 
487 	&sensor_dev_attr_temp1_input.dev_attr.attr,
488 	&sensor_dev_attr_temp1_max.dev_attr.attr,
489 	&sensor_dev_attr_temp1_min.dev_attr.attr,
490 	&sensor_dev_attr_temp1_offset.dev_attr.attr,
491 	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
492 	&sensor_dev_attr_temp2_input.dev_attr.attr,
493 	&sensor_dev_attr_temp2_max.dev_attr.attr,
494 	&sensor_dev_attr_temp2_min.dev_attr.attr,
495 	&sensor_dev_attr_temp2_offset.dev_attr.attr,
496 	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
497 	&sensor_dev_attr_temp2_fault.dev_attr.attr,
498 	&sensor_dev_attr_temp3_input.dev_attr.attr,
499 	&sensor_dev_attr_temp3_max.dev_attr.attr,
500 	&sensor_dev_attr_temp3_min.dev_attr.attr,
501 	&sensor_dev_attr_temp3_offset.dev_attr.attr,
502 	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
503 	&sensor_dev_attr_temp3_fault.dev_attr.attr,
504 
505 	&dev_attr_cpu0_vid.attr,
506 	&dev_attr_vrm.attr,
507 	NULL
508 };
509 
510 static const struct attribute_group smsc47m192_group = {
511 	.attrs = smsc47m192_attributes,
512 };
513 
514 static struct attribute *smsc47m192_attributes_in4[] = {
515 	&sensor_dev_attr_in4_input.dev_attr.attr,
516 	&sensor_dev_attr_in4_min.dev_attr.attr,
517 	&sensor_dev_attr_in4_max.dev_attr.attr,
518 	&sensor_dev_attr_in4_alarm.dev_attr.attr,
519 	NULL
520 };
521 
522 static const struct attribute_group smsc47m192_group_in4 = {
523 	.attrs = smsc47m192_attributes_in4,
524 };
525 
smsc47m192_init_client(struct i2c_client * client)526 static void smsc47m192_init_client(struct i2c_client *client)
527 {
528 	int i;
529 	u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
530 	u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
531 
532 	/* select cycle mode (pause 1 sec between updates) */
533 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
534 						(sfr & 0xfd) | 0x02);
535 	if (!(config & 0x01)) {
536 		/* initialize alarm limits */
537 		for (i = 0; i < 8; i++) {
538 			i2c_smbus_write_byte_data(client,
539 				SMSC47M192_REG_IN_MIN(i), 0);
540 			i2c_smbus_write_byte_data(client,
541 				SMSC47M192_REG_IN_MAX(i), 0xff);
542 		}
543 		for (i = 0; i < 3; i++) {
544 			i2c_smbus_write_byte_data(client,
545 				SMSC47M192_REG_TEMP_MIN[i], 0x80);
546 			i2c_smbus_write_byte_data(client,
547 				SMSC47M192_REG_TEMP_MAX[i], 0x7f);
548 		}
549 
550 		/* start monitoring */
551 		i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
552 						(config & 0xf7) | 0x01);
553 	}
554 }
555 
556 /* Return 0 if detection is successful, -ENODEV otherwise */
smsc47m192_detect(struct i2c_client * client,struct i2c_board_info * info)557 static int smsc47m192_detect(struct i2c_client *client,
558 			     struct i2c_board_info *info)
559 {
560 	struct i2c_adapter *adapter = client->adapter;
561 	int version;
562 
563 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
564 		return -ENODEV;
565 
566 	/* Detection criteria from sensors_detect script */
567 	version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
568 	if (i2c_smbus_read_byte_data(client,
569 				SMSC47M192_REG_COMPANY_ID) == 0x55
570 	 && (version & 0xf0) == 0x20
571 	 && (i2c_smbus_read_byte_data(client,
572 				SMSC47M192_REG_VID) & 0x70) == 0x00
573 	 && (i2c_smbus_read_byte_data(client,
574 				SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
575 		dev_info(&adapter->dev,
576 			 "found SMSC47M192 or compatible, "
577 			 "version 2, stepping A%d\n", version & 0x0f);
578 	} else {
579 		dev_dbg(&adapter->dev,
580 			"SMSC47M192 detection failed at 0x%02x\n",
581 			client->addr);
582 		return -ENODEV;
583 	}
584 
585 	strscpy(info->type, "smsc47m192", I2C_NAME_SIZE);
586 
587 	return 0;
588 }
589 
smsc47m192_probe(struct i2c_client * client)590 static int smsc47m192_probe(struct i2c_client *client)
591 {
592 	struct device *dev = &client->dev;
593 	struct device *hwmon_dev;
594 	struct smsc47m192_data *data;
595 	int config;
596 
597 	data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL);
598 	if (!data)
599 		return -ENOMEM;
600 
601 	data->client = client;
602 	data->vrm = vid_which_vrm();
603 	mutex_init(&data->update_lock);
604 
605 	/* Initialize the SMSC47M192 chip */
606 	smsc47m192_init_client(client);
607 
608 	/* sysfs hooks */
609 	data->groups[0] = &smsc47m192_group;
610 	/* Pin 110 is either in4 (+12V) or VID4 */
611 	config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
612 	if (!(config & 0x20))
613 		data->groups[1] = &smsc47m192_group_in4;
614 
615 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
616 							   data, data->groups);
617 	return PTR_ERR_OR_ZERO(hwmon_dev);
618 }
619 
620 static const struct i2c_device_id smsc47m192_id[] = {
621 	{ "smsc47m192" },
622 	{ }
623 };
624 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
625 
626 static struct i2c_driver smsc47m192_driver = {
627 	.class		= I2C_CLASS_HWMON,
628 	.driver = {
629 		.name	= "smsc47m192",
630 	},
631 	.probe		= smsc47m192_probe,
632 	.id_table	= smsc47m192_id,
633 	.detect		= smsc47m192_detect,
634 	.address_list	= normal_i2c,
635 };
636 
637 module_i2c_driver(smsc47m192_driver);
638 
639 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
640 MODULE_DESCRIPTION("SMSC47M192 driver");
641 MODULE_LICENSE("GPL");
642