xref: /openbmc/linux/drivers/hwmon/smsc47m192.c (revision 9ac8d3fb)
1 /*
2     smsc47m192.c - Support for hardware monitoring block of
3                    SMSC LPC47M192 and compatible Super I/O chips
4 
5     Copyright (C) 2006  Hartmut Rick <linux@rick.claranet.de>
6 
7     Derived from lm78.c and other chip drivers.
8 
9     This program is free software; you can redistribute it and/or modify
10     it under the terms of the GNU General Public License as published by
11     the Free Software Foundation; either version 2 of the License, or
12     (at your option) any later version.
13 
14     This program is distributed in the hope that it will be useful,
15     but WITHOUT ANY WARRANTY; without even the implied warranty of
16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17     GNU General Public License for more details.
18 
19     You should have received a copy of the GNU General Public License
20     along with this program; if not, write to the Free Software
21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23 
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/jiffies.h>
28 #include <linux/i2c.h>
29 #include <linux/hwmon.h>
30 #include <linux/hwmon-sysfs.h>
31 #include <linux/hwmon-vid.h>
32 #include <linux/err.h>
33 #include <linux/sysfs.h>
34 #include <linux/mutex.h>
35 
36 /* Addresses to scan */
37 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
38 
39 /* Insmod parameters */
40 I2C_CLIENT_INSMOD_1(smsc47m192);
41 
42 /* SMSC47M192 registers */
43 #define SMSC47M192_REG_IN(nr)		((nr)<6 ? (0x20 + (nr)) : \
44 					(0x50 + (nr) - 6))
45 #define SMSC47M192_REG_IN_MAX(nr)	((nr)<6 ? (0x2b + (nr) * 2) : \
46 					(0x54 + (((nr) - 6) * 2)))
47 #define SMSC47M192_REG_IN_MIN(nr)	((nr)<6 ? (0x2c + (nr) * 2) : \
48 					(0x55 + (((nr) - 6) * 2)))
49 static u8 SMSC47M192_REG_TEMP[3] =	{ 0x27, 0x26, 0x52 };
50 static u8 SMSC47M192_REG_TEMP_MAX[3] =	{ 0x39, 0x37, 0x58 };
51 static u8 SMSC47M192_REG_TEMP_MIN[3] =	{ 0x3A, 0x38, 0x59 };
52 #define SMSC47M192_REG_TEMP_OFFSET(nr)	((nr)==2 ? 0x1e : 0x1f)
53 #define SMSC47M192_REG_ALARM1		0x41
54 #define SMSC47M192_REG_ALARM2		0x42
55 #define SMSC47M192_REG_VID		0x47
56 #define SMSC47M192_REG_VID4		0x49
57 #define SMSC47M192_REG_CONFIG		0x40
58 #define SMSC47M192_REG_SFR		0x4f
59 #define SMSC47M192_REG_COMPANY_ID	0x3e
60 #define SMSC47M192_REG_VERSION		0x3f
61 
62 /* generalised scaling with integer rounding */
63 static inline int SCALE(long val, int mul, int div)
64 {
65 	if (val < 0)
66 		return (val * mul - div / 2) / div;
67 	else
68 		return (val * mul + div / 2) / div;
69 }
70 
71 /* Conversions */
72 
73 /* smsc47m192 internally scales voltage measurements */
74 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
75 
76 static inline unsigned int IN_FROM_REG(u8 reg, int n)
77 {
78 	return SCALE(reg, nom_mv[n], 192);
79 }
80 
81 static inline u8 IN_TO_REG(unsigned long val, int n)
82 {
83 	return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
84 }
85 
86 /* TEMP: 0.001 degC units (-128C to +127C)
87    REG: 1C/bit, two's complement */
88 static inline s8 TEMP_TO_REG(int val)
89 {
90 	return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);
91 }
92 
93 static inline int TEMP_FROM_REG(s8 val)
94 {
95 	return val * 1000;
96 }
97 
98 struct smsc47m192_data {
99 	struct device *hwmon_dev;
100 	struct mutex update_lock;
101 	char valid;		/* !=0 if following fields are valid */
102 	unsigned long last_updated;	/* In jiffies */
103 
104 	u8 in[8];		/* Register value */
105 	u8 in_max[8];		/* Register value */
106 	u8 in_min[8];		/* Register value */
107 	s8 temp[3];		/* Register value */
108 	s8 temp_max[3];		/* Register value */
109 	s8 temp_min[3];		/* Register value */
110 	s8 temp_offset[3];	/* Register value */
111 	u16 alarms;		/* Register encoding, combined */
112 	u8 vid;			/* Register encoding, combined */
113 	u8 vrm;
114 };
115 
116 static int smsc47m192_probe(struct i2c_client *client,
117 			    const struct i2c_device_id *id);
118 static int smsc47m192_detect(struct i2c_client *client, int kind,
119 			     struct i2c_board_info *info);
120 static int smsc47m192_remove(struct i2c_client *client);
121 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
122 
123 static const struct i2c_device_id smsc47m192_id[] = {
124 	{ "smsc47m192", smsc47m192 },
125 	{ }
126 };
127 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
128 
129 static struct i2c_driver smsc47m192_driver = {
130 	.class		= I2C_CLASS_HWMON,
131 	.driver = {
132 		.name	= "smsc47m192",
133 	},
134 	.probe		= smsc47m192_probe,
135 	.remove		= smsc47m192_remove,
136 	.id_table	= smsc47m192_id,
137 	.detect		= smsc47m192_detect,
138 	.address_data	= &addr_data,
139 };
140 
141 /* Voltages */
142 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
143 		char *buf)
144 {
145 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
146 	int nr = sensor_attr->index;
147 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
148 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
149 }
150 
151 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
152 		char *buf)
153 {
154 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
155 	int nr = sensor_attr->index;
156 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
157 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
158 }
159 
160 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
161 		char *buf)
162 {
163 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
164 	int nr = sensor_attr->index;
165 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
166 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
167 }
168 
169 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
170 		const char *buf, size_t count)
171 {
172 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
173 	int nr = sensor_attr->index;
174 	struct i2c_client *client = to_i2c_client(dev);
175 	struct smsc47m192_data *data = i2c_get_clientdata(client);
176 	unsigned long val = simple_strtoul(buf, NULL, 10);
177 
178 	mutex_lock(&data->update_lock);
179 	data->in_min[nr] = IN_TO_REG(val, nr);
180 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
181 							data->in_min[nr]);
182 	mutex_unlock(&data->update_lock);
183 	return count;
184 }
185 
186 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
187 		const char *buf, size_t count)
188 {
189 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
190 	int nr = sensor_attr->index;
191 	struct i2c_client *client = to_i2c_client(dev);
192 	struct smsc47m192_data *data = i2c_get_clientdata(client);
193 	unsigned long val = simple_strtoul(buf, NULL, 10);
194 
195 	mutex_lock(&data->update_lock);
196 	data->in_max[nr] = IN_TO_REG(val, nr);
197 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
198 							data->in_max[nr]);
199 	mutex_unlock(&data->update_lock);
200 	return count;
201 }
202 
203 #define show_in_offset(offset)					\
204 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,		\
205 		show_in, NULL, offset);				\
206 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,	\
207 		show_in_min, set_in_min, offset);		\
208 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,	\
209 		show_in_max, set_in_max, offset);
210 
211 show_in_offset(0)
212 show_in_offset(1)
213 show_in_offset(2)
214 show_in_offset(3)
215 show_in_offset(4)
216 show_in_offset(5)
217 show_in_offset(6)
218 show_in_offset(7)
219 
220 /* Temperatures */
221 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
222 		char *buf)
223 {
224 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
225 	int nr = sensor_attr->index;
226 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
227 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
228 }
229 
230 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
231 		char *buf)
232 {
233 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
234 	int nr = sensor_attr->index;
235 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
236 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
237 }
238 
239 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
240 		char *buf)
241 {
242 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
243 	int nr = sensor_attr->index;
244 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
245 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
246 }
247 
248 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
249 		const char *buf, size_t count)
250 {
251 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
252 	int nr = sensor_attr->index;
253 	struct i2c_client *client = to_i2c_client(dev);
254 	struct smsc47m192_data *data = i2c_get_clientdata(client);
255 	long val = simple_strtol(buf, NULL, 10);
256 
257 	mutex_lock(&data->update_lock);
258 	data->temp_min[nr] = TEMP_TO_REG(val);
259 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
260 						data->temp_min[nr]);
261 	mutex_unlock(&data->update_lock);
262 	return count;
263 }
264 
265 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
266 		const char *buf, size_t count)
267 {
268 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
269 	int nr = sensor_attr->index;
270 	struct i2c_client *client = to_i2c_client(dev);
271 	struct smsc47m192_data *data = i2c_get_clientdata(client);
272 	long val = simple_strtol(buf, NULL, 10);
273 
274 	mutex_lock(&data->update_lock);
275 	data->temp_max[nr] = TEMP_TO_REG(val);
276 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
277 						data->temp_max[nr]);
278 	mutex_unlock(&data->update_lock);
279 	return count;
280 }
281 
282 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
283 		*attr, char *buf)
284 {
285 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
286 	int nr = sensor_attr->index;
287 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
288 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
289 }
290 
291 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
292 		*attr, const char *buf, size_t count)
293 {
294 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
295 	int nr = sensor_attr->index;
296 	struct i2c_client *client = to_i2c_client(dev);
297 	struct smsc47m192_data *data = i2c_get_clientdata(client);
298 	u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
299 	long val = simple_strtol(buf, NULL, 10);
300 
301 	mutex_lock(&data->update_lock);
302 	data->temp_offset[nr] = TEMP_TO_REG(val);
303 	if (nr>1)
304 		i2c_smbus_write_byte_data(client,
305 			SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
306 	else if (data->temp_offset[nr] != 0) {
307 		/* offset[0] and offset[1] share the same register,
308 			SFR bit 4 activates offset[0] */
309 		i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
310 					(sfr & 0xef) | (nr==0 ? 0x10 : 0));
311 		data->temp_offset[1-nr] = 0;
312 		i2c_smbus_write_byte_data(client,
313 			SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
314 	} else if ((sfr & 0x10) == (nr==0 ? 0x10 : 0))
315 		i2c_smbus_write_byte_data(client,
316 					SMSC47M192_REG_TEMP_OFFSET(nr), 0);
317 	mutex_unlock(&data->update_lock);
318 	return count;
319 }
320 
321 #define show_temp_index(index)						\
322 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,			\
323 		show_temp, NULL, index-1);				\
324 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,		\
325 		show_temp_min, set_temp_min, index-1);			\
326 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,		\
327 		show_temp_max, set_temp_max, index-1);			\
328 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,	\
329 		show_temp_offset, set_temp_offset, index-1);
330 
331 show_temp_index(1)
332 show_temp_index(2)
333 show_temp_index(3)
334 
335 /* VID */
336 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
337 		char *buf)
338 {
339 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
340 	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
341 }
342 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
343 
344 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
345 		char *buf)
346 {
347 	struct smsc47m192_data *data = dev_get_drvdata(dev);
348 	return sprintf(buf, "%d\n", data->vrm);
349 }
350 
351 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
352 		const char *buf, size_t count)
353 {
354 	struct smsc47m192_data *data = dev_get_drvdata(dev);
355 	data->vrm = simple_strtoul(buf, NULL, 10);
356 	return count;
357 }
358 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
359 
360 /* Alarms */
361 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
362 		char *buf)
363 {
364 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
365 	int nr = sensor_attr->index;
366 	struct smsc47m192_data *data = smsc47m192_update_device(dev);
367 	return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
368 }
369 
370 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
371 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
372 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
373 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
374 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
375 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
376 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
377 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
378 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
379 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
380 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
381 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
382 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
383 
384 static struct attribute *smsc47m192_attributes[] = {
385 	&sensor_dev_attr_in0_input.dev_attr.attr,
386 	&sensor_dev_attr_in0_min.dev_attr.attr,
387 	&sensor_dev_attr_in0_max.dev_attr.attr,
388 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
389 	&sensor_dev_attr_in1_input.dev_attr.attr,
390 	&sensor_dev_attr_in1_min.dev_attr.attr,
391 	&sensor_dev_attr_in1_max.dev_attr.attr,
392 	&sensor_dev_attr_in1_alarm.dev_attr.attr,
393 	&sensor_dev_attr_in2_input.dev_attr.attr,
394 	&sensor_dev_attr_in2_min.dev_attr.attr,
395 	&sensor_dev_attr_in2_max.dev_attr.attr,
396 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
397 	&sensor_dev_attr_in3_input.dev_attr.attr,
398 	&sensor_dev_attr_in3_min.dev_attr.attr,
399 	&sensor_dev_attr_in3_max.dev_attr.attr,
400 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
401 	&sensor_dev_attr_in5_input.dev_attr.attr,
402 	&sensor_dev_attr_in5_min.dev_attr.attr,
403 	&sensor_dev_attr_in5_max.dev_attr.attr,
404 	&sensor_dev_attr_in5_alarm.dev_attr.attr,
405 	&sensor_dev_attr_in6_input.dev_attr.attr,
406 	&sensor_dev_attr_in6_min.dev_attr.attr,
407 	&sensor_dev_attr_in6_max.dev_attr.attr,
408 	&sensor_dev_attr_in6_alarm.dev_attr.attr,
409 	&sensor_dev_attr_in7_input.dev_attr.attr,
410 	&sensor_dev_attr_in7_min.dev_attr.attr,
411 	&sensor_dev_attr_in7_max.dev_attr.attr,
412 	&sensor_dev_attr_in7_alarm.dev_attr.attr,
413 
414 	&sensor_dev_attr_temp1_input.dev_attr.attr,
415 	&sensor_dev_attr_temp1_max.dev_attr.attr,
416 	&sensor_dev_attr_temp1_min.dev_attr.attr,
417 	&sensor_dev_attr_temp1_offset.dev_attr.attr,
418 	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
419 	&sensor_dev_attr_temp2_input.dev_attr.attr,
420 	&sensor_dev_attr_temp2_max.dev_attr.attr,
421 	&sensor_dev_attr_temp2_min.dev_attr.attr,
422 	&sensor_dev_attr_temp2_offset.dev_attr.attr,
423 	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
424 	&sensor_dev_attr_temp2_fault.dev_attr.attr,
425 	&sensor_dev_attr_temp3_input.dev_attr.attr,
426 	&sensor_dev_attr_temp3_max.dev_attr.attr,
427 	&sensor_dev_attr_temp3_min.dev_attr.attr,
428 	&sensor_dev_attr_temp3_offset.dev_attr.attr,
429 	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
430 	&sensor_dev_attr_temp3_fault.dev_attr.attr,
431 
432 	&dev_attr_cpu0_vid.attr,
433 	&dev_attr_vrm.attr,
434 	NULL
435 };
436 
437 static const struct attribute_group smsc47m192_group = {
438 	.attrs = smsc47m192_attributes,
439 };
440 
441 static struct attribute *smsc47m192_attributes_in4[] = {
442 	&sensor_dev_attr_in4_input.dev_attr.attr,
443 	&sensor_dev_attr_in4_min.dev_attr.attr,
444 	&sensor_dev_attr_in4_max.dev_attr.attr,
445 	&sensor_dev_attr_in4_alarm.dev_attr.attr,
446 	NULL
447 };
448 
449 static const struct attribute_group smsc47m192_group_in4 = {
450 	.attrs = smsc47m192_attributes_in4,
451 };
452 
453 static void smsc47m192_init_client(struct i2c_client *client)
454 {
455 	int i;
456 	u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
457 	u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
458 
459 	/* select cycle mode (pause 1 sec between updates) */
460 	i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
461 						(sfr & 0xfd) | 0x02);
462 	if (!(config & 0x01)) {
463 		/* initialize alarm limits */
464 		for (i=0; i<8; i++) {
465 			i2c_smbus_write_byte_data(client,
466 				SMSC47M192_REG_IN_MIN(i), 0);
467 			i2c_smbus_write_byte_data(client,
468 				SMSC47M192_REG_IN_MAX(i), 0xff);
469 		}
470 		for (i=0; i<3; i++) {
471 			i2c_smbus_write_byte_data(client,
472 				SMSC47M192_REG_TEMP_MIN[i], 0x80);
473 			i2c_smbus_write_byte_data(client,
474 				SMSC47M192_REG_TEMP_MAX[i], 0x7f);
475 		}
476 
477 		/* start monitoring */
478 		i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
479 						(config & 0xf7) | 0x01);
480 	}
481 }
482 
483 /* Return 0 if detection is successful, -ENODEV otherwise */
484 static int smsc47m192_detect(struct i2c_client *client, int kind,
485 			     struct i2c_board_info *info)
486 {
487 	struct i2c_adapter *adapter = client->adapter;
488 	int version;
489 
490 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
491 		return -ENODEV;
492 
493 	/* Detection criteria from sensors_detect script */
494 	if (kind < 0) {
495 		if (i2c_smbus_read_byte_data(client,
496 				SMSC47M192_REG_COMPANY_ID) == 0x55
497 		 && ((version = i2c_smbus_read_byte_data(client,
498 				SMSC47M192_REG_VERSION)) & 0xf0) == 0x20
499 		 && (i2c_smbus_read_byte_data(client,
500 				SMSC47M192_REG_VID) & 0x70) == 0x00
501 		 && (i2c_smbus_read_byte_data(client,
502 				SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
503 			dev_info(&adapter->dev,
504 				 "found SMSC47M192 or compatible, "
505 				 "version 2, stepping A%d\n", version & 0x0f);
506 		} else {
507 			dev_dbg(&adapter->dev,
508 				"SMSC47M192 detection failed at 0x%02x\n",
509 				client->addr);
510 			return -ENODEV;
511 		}
512 	}
513 
514 	strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
515 
516 	return 0;
517 }
518 
519 static int smsc47m192_probe(struct i2c_client *client,
520 			    const struct i2c_device_id *id)
521 {
522 	struct smsc47m192_data *data;
523 	int config;
524 	int err;
525 
526 	data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL);
527 	if (!data) {
528 		err = -ENOMEM;
529 		goto exit;
530 	}
531 
532 	i2c_set_clientdata(client, data);
533 	data->vrm = vid_which_vrm();
534 	mutex_init(&data->update_lock);
535 
536 	/* Initialize the SMSC47M192 chip */
537 	smsc47m192_init_client(client);
538 
539 	/* Register sysfs hooks */
540 	if ((err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group)))
541 		goto exit_free;
542 
543 	/* Pin 110 is either in4 (+12V) or VID4 */
544 	config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
545 	if (!(config & 0x20)) {
546 		if ((err = sysfs_create_group(&client->dev.kobj,
547 					      &smsc47m192_group_in4)))
548 			goto exit_remove_files;
549 	}
550 
551 	data->hwmon_dev = hwmon_device_register(&client->dev);
552 	if (IS_ERR(data->hwmon_dev)) {
553 		err = PTR_ERR(data->hwmon_dev);
554 		goto exit_remove_files;
555 	}
556 
557 	return 0;
558 
559 exit_remove_files:
560 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
561 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
562 exit_free:
563 	kfree(data);
564 exit:
565 	return err;
566 }
567 
568 static int smsc47m192_remove(struct i2c_client *client)
569 {
570 	struct smsc47m192_data *data = i2c_get_clientdata(client);
571 
572 	hwmon_device_unregister(data->hwmon_dev);
573 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
574 	sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
575 
576 	kfree(data);
577 
578 	return 0;
579 }
580 
581 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
582 {
583 	struct i2c_client *client = to_i2c_client(dev);
584 	struct smsc47m192_data *data = i2c_get_clientdata(client);
585 	int i, config;
586 
587 	mutex_lock(&data->update_lock);
588 
589 	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
590 	 || !data->valid) {
591 		u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
592 
593 		dev_dbg(&client->dev, "Starting smsc47m192 update\n");
594 
595 		for (i = 0; i <= 7; i++) {
596 			data->in[i] = i2c_smbus_read_byte_data(client,
597 						SMSC47M192_REG_IN(i));
598 			data->in_min[i] = i2c_smbus_read_byte_data(client,
599 						SMSC47M192_REG_IN_MIN(i));
600 			data->in_max[i] = i2c_smbus_read_byte_data(client,
601 						SMSC47M192_REG_IN_MAX(i));
602 		}
603 		for (i = 0; i < 3; i++) {
604 			data->temp[i] = i2c_smbus_read_byte_data(client,
605 						SMSC47M192_REG_TEMP[i]);
606 			data->temp_max[i] = i2c_smbus_read_byte_data(client,
607 						SMSC47M192_REG_TEMP_MAX[i]);
608 			data->temp_min[i] = i2c_smbus_read_byte_data(client,
609 						SMSC47M192_REG_TEMP_MIN[i]);
610 		}
611 		for (i = 1; i < 3; i++)
612 			data->temp_offset[i] = i2c_smbus_read_byte_data(client,
613 						SMSC47M192_REG_TEMP_OFFSET(i));
614 		/* first offset is temp_offset[0] if SFR bit 4 is set,
615 					temp_offset[1] otherwise */
616 		if (sfr & 0x10) {
617 			data->temp_offset[0] = data->temp_offset[1];
618 			data->temp_offset[1] = 0;
619 		} else
620 			data->temp_offset[0] = 0;
621 
622 		data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
623 			    & 0x0f;
624 		config = i2c_smbus_read_byte_data(client,
625 						  SMSC47M192_REG_CONFIG);
626 		if (config & 0x20)
627 			data->vid |= (i2c_smbus_read_byte_data(client,
628 					SMSC47M192_REG_VID4) & 0x01) << 4;
629 		data->alarms = i2c_smbus_read_byte_data(client,
630 						SMSC47M192_REG_ALARM1) |
631 			       (i2c_smbus_read_byte_data(client,
632 		       				SMSC47M192_REG_ALARM2) << 8);
633 
634 		data->last_updated = jiffies;
635 		data->valid = 1;
636 	}
637 
638 	mutex_unlock(&data->update_lock);
639 
640 	return data;
641 }
642 
643 static int __init smsc47m192_init(void)
644 {
645 	return i2c_add_driver(&smsc47m192_driver);
646 }
647 
648 static void __exit smsc47m192_exit(void)
649 {
650 	i2c_del_driver(&smsc47m192_driver);
651 }
652 
653 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
654 MODULE_DESCRIPTION("SMSC47M192 driver");
655 MODULE_LICENSE("GPL");
656 
657 module_init(smsc47m192_init);
658 module_exit(smsc47m192_exit);
659