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/drivers/i2c/chips/lm87.c

https://bitbucket.org/evzijst/gittest
C | 829 lines | 613 code | 111 blank | 105 comment | 39 complexity | 56df926afd00d7403b5398fe4a16b117 MD5 | raw file
  1/*
  2 * lm87.c
  3 *
  4 * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
  5 *                          Philip Edelbrock <phil@netroedge.com>
  6 *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
  7 *                          Dan Eaton <dan.eaton@rocketlogix.com>
  8 * Copyright (C) 2004       Jean Delvare <khali@linux-fr.org>
  9 *
 10 * Original port to Linux 2.6 by Jeff Oliver.
 11 *
 12 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
 13 * to 8 voltages (including its own power source), up to three temperatures
 14 * (its own plus up to two external ones) and up to two fans. The default
 15 * configuration is 6 voltages, two temperatures and two fans (see below).
 16 * Voltages are scaled internally with ratios such that the nominal value of
 17 * each voltage correspond to a register value of 192 (which means a
 18 * resolution of about 0.5% of the nominal value). Temperature values are
 19 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
 20 * datasheet can be obtained from National's website at:
 21 *   http://www.national.com/pf/LM/LM87.html
 22 *
 23 * Some functions share pins, so not all functions are available at the same
 24 * time. Which are depends on the hardware setup. This driver assumes that
 25 * the BIOS configured the chip correctly. In that respect, it  differs from
 26 * the original driver (from lm_sensors for Linux 2.4), which would force the
 27 * LM87 to an arbitrary, compile-time chosen mode, regardless of the actual
 28 * chipset wiring.
 29 * For reference, here is the list of exclusive functions:
 30 *  - in0+in5 (default) or temp3
 31 *  - fan1 (default) or in6
 32 *  - fan2 (default) or in7
 33 *  - VID lines (default) or IRQ lines (not handled by this driver)
 34 *
 35 * The LM87 additionally features an analog output, supposedly usable to
 36 * control the speed of a fan. All new chips use pulse width modulation
 37 * instead. The LM87 is the only hardware monitoring chipset I know of
 38 * which uses amplitude modulation. Be careful when using this feature.
 39 *
 40 * This program is free software; you can redistribute it and/or modify
 41 * it under the terms of the GNU General Public License as published by
 42 * the Free Software Foundation; either version 2 of the License, or
 43 * (at your option) any later version.
 44 *
 45 * This program is distributed in the hope that it will be useful,
 46 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 47 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 48 * GNU General Public License for more details.
 49 *
 50 * You should have received a copy of the GNU General Public License
 51 * along with this program; if not, write to the Free Software
 52 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 53 */
 54
 55#include <linux/config.h>
 56#include <linux/module.h>
 57#include <linux/init.h>
 58#include <linux/slab.h>
 59#include <linux/jiffies.h>
 60#include <linux/i2c.h>
 61#include <linux/i2c-sensor.h>
 62#include <linux/i2c-vid.h>
 63
 64/*
 65 * Addresses to scan
 66 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
 67 */
 68
 69static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
 70static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
 71
 72/*
 73 * Insmod parameters
 74 */
 75
 76SENSORS_INSMOD_1(lm87);
 77
 78/*
 79 * The LM87 registers
 80 */
 81
 82/* nr in 0..5 */
 83#define LM87_REG_IN(nr)			(0x20 + (nr))
 84#define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
 85#define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
 86/* nr in 0..1 */
 87#define LM87_REG_AIN(nr)		(0x28 + (nr))
 88#define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
 89#define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))
 90
 91static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
 92static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
 93static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
 94
 95#define LM87_REG_TEMP_HW_INT_LOCK	0x13
 96#define LM87_REG_TEMP_HW_EXT_LOCK	0x14
 97#define LM87_REG_TEMP_HW_INT		0x17
 98#define LM87_REG_TEMP_HW_EXT		0x18
 99
100/* nr in 0..1 */
101#define LM87_REG_FAN(nr)		(0x28 + (nr))
102#define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
103#define LM87_REG_AOUT			0x19
104
105#define LM87_REG_CONFIG			0x40
106#define LM87_REG_CHANNEL_MODE		0x16
107#define LM87_REG_VID_FAN_DIV		0x47
108#define LM87_REG_VID4			0x49
109
110#define LM87_REG_ALARMS1		0x41
111#define LM87_REG_ALARMS2		0x42
112
113#define LM87_REG_COMPANY_ID		0x3E
114#define LM87_REG_REVISION		0x3F
115
116/*
117 * Conversions and various macros
118 * The LM87 uses signed 8-bit values for temperatures.
119 */
120
121#define IN_FROM_REG(reg,scale)	(((reg) * (scale) + 96) / 192)
122#define IN_TO_REG(val,scale)	((val) <= 0 ? 0 : \
123				 (val) * 192 >= (scale) * 255 ? 255 : \
124				 ((val) * 192 + (scale)/2) / (scale))
125
126#define TEMP_FROM_REG(reg)	((reg) * 1000)
127#define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
128				 (val) >= 126500 ? 127 : \
129				 (((val) < 0 ? (val)-500 : (val)+500) / 1000))
130
131#define FAN_FROM_REG(reg,div)	((reg) == 255 || (reg) == 0 ? 0 : \
132				 1350000 + (reg)*(div) / 2) / ((reg)*(div))
133#define FAN_TO_REG(val,div)	((val)*(div) * 255 <= 1350000 ? 255 : \
134				 (1350000 + (val)*(div) / 2) / ((val)*(div)))
135
136#define FAN_DIV_FROM_REG(reg)	(1 << (reg))
137
138/* analog out is 9.80mV/LSB */
139#define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
140#define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
141				 (val) >= 2500 ? 255 : \
142				 ((val) * 10 + 49) / 98)
143
144/* nr in 0..1 */
145#define CHAN_NO_FAN(nr)		(1 << (nr))
146#define CHAN_TEMP3		(1 << 2)
147#define CHAN_VCC_5V		(1 << 3)
148#define CHAN_NO_VID		(1 << 8)
149
150/*
151 * Functions declaration
152 */
153
154static int lm87_attach_adapter(struct i2c_adapter *adapter);
155static int lm87_detect(struct i2c_adapter *adapter, int address, int kind);
156static void lm87_init_client(struct i2c_client *client);
157static int lm87_detach_client(struct i2c_client *client);
158static struct lm87_data *lm87_update_device(struct device *dev);
159
160/*
161 * Driver data (common to all clients)
162 */
163
164static struct i2c_driver lm87_driver = {
165	.owner		= THIS_MODULE,
166	.name		= "lm87",
167	.id		= I2C_DRIVERID_LM87,
168	.flags		= I2C_DF_NOTIFY,
169	.attach_adapter	= lm87_attach_adapter,
170	.detach_client	= lm87_detach_client,
171};
172
173/*
174 * Client data (each client gets its own)
175 */
176
177struct lm87_data {
178	struct i2c_client client;
179	struct semaphore update_lock;
180	char valid; /* zero until following fields are valid */
181	unsigned long last_updated; /* In jiffies */
182
183	u8 channel;		/* register value */
184
185	u8 in[8];		/* register value */
186	u8 in_max[8];		/* register value */
187	u8 in_min[8];		/* register value */
188	u16 in_scale[8];
189
190	s8 temp[3];		/* register value */
191	s8 temp_high[3];	/* register value */
192	s8 temp_low[3];		/* register value */
193	s8 temp_crit_int;	/* min of two register values */
194	s8 temp_crit_ext;	/* min of two register values */
195
196	u8 fan[2];		/* register value */
197	u8 fan_min[2];		/* register value */
198	u8 fan_div[2];		/* register value, shifted right */
199	u8 aout;		/* register value */
200
201	u16 alarms;		/* register values, combined */
202	u8 vid;			/* register values, combined */
203	u8 vrm;
204};
205
206/*
207 * Sysfs stuff
208 */
209
210static inline int lm87_read_value(struct i2c_client *client, u8 reg)
211{
212	return i2c_smbus_read_byte_data(client, reg);
213}
214
215static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
216{
217	return i2c_smbus_write_byte_data(client, reg, value);
218}
219
220#define show_in(offset) \
221static ssize_t show_in##offset##_input(struct device *dev, char *buf) \
222{ \
223	struct lm87_data *data = lm87_update_device(dev); \
224	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
225		       data->in_scale[offset])); \
226} \
227static ssize_t show_in##offset##_min(struct device *dev, char *buf) \
228{ \
229	struct lm87_data *data = lm87_update_device(dev); \
230	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
231		       data->in_scale[offset])); \
232} \
233static ssize_t show_in##offset##_max(struct device *dev, char *buf) \
234{ \
235	struct lm87_data *data = lm87_update_device(dev); \
236	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
237		       data->in_scale[offset])); \
238} \
239static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
240		show_in##offset##_input, NULL);
241show_in(0);
242show_in(1);
243show_in(2);
244show_in(3);
245show_in(4);
246show_in(5);
247show_in(6);
248show_in(7);
249
250static void set_in_min(struct device *dev, const char *buf, int nr)
251{
252	struct i2c_client *client = to_i2c_client(dev);
253	struct lm87_data *data = i2c_get_clientdata(client);
254	long val = simple_strtol(buf, NULL, 10);
255
256	down(&data->update_lock);
257	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
258	lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
259			 LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
260	up(&data->update_lock);
261}
262
263static void set_in_max(struct device *dev, const char *buf, int nr)
264{
265	struct i2c_client *client = to_i2c_client(dev);
266	struct lm87_data *data = i2c_get_clientdata(client);
267	long val = simple_strtol(buf, NULL, 10);
268
269	down(&data->update_lock);
270	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
271	lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
272			 LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
273	up(&data->update_lock);
274}
275
276#define set_in(offset) \
277static ssize_t set_in##offset##_min(struct device *dev, \
278		const char *buf, size_t count) \
279{ \
280	set_in_min(dev, buf, offset); \
281	return count; \
282} \
283static ssize_t set_in##offset##_max(struct device *dev, \
284		const char *buf, size_t count) \
285{ \
286	set_in_max(dev, buf, offset); \
287	return count; \
288} \
289static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
290		show_in##offset##_min, set_in##offset##_min); \
291static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
292		show_in##offset##_max, set_in##offset##_max);
293set_in(0);
294set_in(1);
295set_in(2);
296set_in(3);
297set_in(4);
298set_in(5);
299set_in(6);
300set_in(7);
301
302#define show_temp(offset) \
303static ssize_t show_temp##offset##_input(struct device *dev, char *buf) \
304{ \
305	struct lm87_data *data = lm87_update_device(dev); \
306	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
307} \
308static ssize_t show_temp##offset##_low(struct device *dev, char *buf) \
309{ \
310	struct lm87_data *data = lm87_update_device(dev); \
311	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
312} \
313static ssize_t show_temp##offset##_high(struct device *dev, char *buf) \
314{ \
315	struct lm87_data *data = lm87_update_device(dev); \
316	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
317}\
318static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
319		show_temp##offset##_input, NULL);
320show_temp(1);
321show_temp(2);
322show_temp(3);
323
324static void set_temp_low(struct device *dev, const char *buf, int nr)
325{
326	struct i2c_client *client = to_i2c_client(dev);
327	struct lm87_data *data = i2c_get_clientdata(client);
328	long val = simple_strtol(buf, NULL, 10);
329
330	down(&data->update_lock);
331	data->temp_low[nr] = TEMP_TO_REG(val);
332	lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
333	up(&data->update_lock);
334}
335
336static void set_temp_high(struct device *dev, const char *buf, int nr)
337{
338	struct i2c_client *client = to_i2c_client(dev);
339	struct lm87_data *data = i2c_get_clientdata(client);
340	long val = simple_strtol(buf, NULL, 10);
341
342	down(&data->update_lock);
343	data->temp_high[nr] = TEMP_TO_REG(val);
344	lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
345	up(&data->update_lock);
346}
347
348#define set_temp(offset) \
349static ssize_t set_temp##offset##_low(struct device *dev, \
350		const char *buf, size_t count) \
351{ \
352	set_temp_low(dev, buf, offset-1); \
353	return count; \
354} \
355static ssize_t set_temp##offset##_high(struct device *dev, \
356		const char *buf, size_t count) \
357{ \
358	set_temp_high(dev, buf, offset-1); \
359	return count; \
360} \
361static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
362		show_temp##offset##_high, set_temp##offset##_high); \
363static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
364		show_temp##offset##_low, set_temp##offset##_low);
365set_temp(1);
366set_temp(2);
367set_temp(3);
368
369static ssize_t show_temp_crit_int(struct device *dev, char *buf)
370{
371	struct lm87_data *data = lm87_update_device(dev);
372	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
373}
374
375static ssize_t show_temp_crit_ext(struct device *dev, char *buf)
376{
377	struct lm87_data *data = lm87_update_device(dev);
378	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
379}
380
381static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
382static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
383static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
384
385#define show_fan(offset) \
386static ssize_t show_fan##offset##_input(struct device *dev, char *buf) \
387{ \
388	struct lm87_data *data = lm87_update_device(dev); \
389	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
390		       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
391} \
392static ssize_t show_fan##offset##_min(struct device *dev, char *buf) \
393{ \
394	struct lm87_data *data = lm87_update_device(dev); \
395	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
396		       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
397} \
398static ssize_t show_fan##offset##_div(struct device *dev, char *buf) \
399{ \
400	struct lm87_data *data = lm87_update_device(dev); \
401	return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
402} \
403static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
404		show_fan##offset##_input, NULL);
405show_fan(1);
406show_fan(2);
407
408static void set_fan_min(struct device *dev, const char *buf, int nr)
409{
410	struct i2c_client *client = to_i2c_client(dev);
411	struct lm87_data *data = i2c_get_clientdata(client);
412	long val = simple_strtol(buf, NULL, 10);
413
414	down(&data->update_lock);
415	data->fan_min[nr] = FAN_TO_REG(val,
416			    FAN_DIV_FROM_REG(data->fan_div[nr]));
417	lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
418	up(&data->update_lock);
419}
420
421/* Note: we save and restore the fan minimum here, because its value is
422   determined in part by the fan clock divider.  This follows the principle
423   of least suprise; the user doesn't expect the fan minimum to change just
424   because the divider changed. */
425static ssize_t set_fan_div(struct device *dev, const char *buf,
426		size_t count, int nr)
427{
428	struct i2c_client *client = to_i2c_client(dev);
429	struct lm87_data *data = i2c_get_clientdata(client);
430	long val = simple_strtol(buf, NULL, 10);
431	unsigned long min;
432	u8 reg;
433
434	down(&data->update_lock);
435	min = FAN_FROM_REG(data->fan_min[nr],
436			   FAN_DIV_FROM_REG(data->fan_div[nr]));
437
438	switch (val) {
439	case 1: data->fan_div[nr] = 0; break;
440	case 2: data->fan_div[nr] = 1; break;
441	case 4: data->fan_div[nr] = 2; break;
442	case 8: data->fan_div[nr] = 3; break;
443	default:
444		up(&data->update_lock);
445		return -EINVAL;
446	}
447
448	reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
449	switch (nr) {
450	case 0:
451	    reg = (reg & 0xCF) | (data->fan_div[0] << 4);
452	    break;
453	case 1:
454	    reg = (reg & 0x3F) | (data->fan_div[1] << 6);
455	    break;
456	}
457	lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
458
459	data->fan_min[nr] = FAN_TO_REG(min, val);
460	lm87_write_value(client, LM87_REG_FAN_MIN(nr),
461			 data->fan_min[nr]);
462	up(&data->update_lock);
463
464	return count;
465}
466
467#define set_fan(offset) \
468static ssize_t set_fan##offset##_min(struct device *dev, const char *buf, \
469		size_t count) \
470{ \
471	set_fan_min(dev, buf, offset-1); \
472	return count; \
473} \
474static ssize_t set_fan##offset##_div(struct device *dev, const char *buf, \
475		size_t count) \
476{ \
477	return set_fan_div(dev, buf, count, offset-1); \
478} \
479static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
480		show_fan##offset##_min, set_fan##offset##_min); \
481static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
482		show_fan##offset##_div, set_fan##offset##_div);
483set_fan(1);
484set_fan(2);
485
486static ssize_t show_alarms(struct device *dev, char *buf)
487{
488	struct lm87_data *data = lm87_update_device(dev);
489	return sprintf(buf, "%d\n", data->alarms);
490}
491static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
492
493static ssize_t show_vid(struct device *dev, char *buf)
494{
495	struct lm87_data *data = lm87_update_device(dev);
496	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
497}
498static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
499
500static ssize_t show_vrm(struct device *dev, char *buf)
501{
502	struct lm87_data *data = lm87_update_device(dev);
503	return sprintf(buf, "%d\n", data->vrm);
504}
505static ssize_t set_vrm(struct device *dev, const char *buf, size_t count)
506{
507	struct i2c_client *client = to_i2c_client(dev);
508	struct lm87_data *data = i2c_get_clientdata(client);
509	data->vrm = simple_strtoul(buf, NULL, 10);
510	return count;
511}
512static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
513
514static ssize_t show_aout(struct device *dev, char *buf)
515{
516	struct lm87_data *data = lm87_update_device(dev);
517	return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
518}
519static ssize_t set_aout(struct device *dev, const char *buf, size_t count)
520{
521	struct i2c_client *client = to_i2c_client(dev);
522	struct lm87_data *data = i2c_get_clientdata(client);
523	long val = simple_strtol(buf, NULL, 10);
524
525	down(&data->update_lock);
526	data->aout = AOUT_TO_REG(val);
527	lm87_write_value(client, LM87_REG_AOUT, data->aout);
528	up(&data->update_lock);
529	return count;
530}
531static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
532
533/*
534 * Real code
535 */
536
537static int lm87_attach_adapter(struct i2c_adapter *adapter)
538{
539	if (!(adapter->class & I2C_CLASS_HWMON))
540		return 0;
541	return i2c_detect(adapter, &addr_data, lm87_detect);
542}
543
544/*
545 * The following function does more than just detection. If detection
546 * succeeds, it also registers the new chip.
547 */
548static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
549{
550	struct i2c_client *new_client;
551	struct lm87_data *data;
552	int err = 0;
553
554	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
555		goto exit;
556
557	if (!(data = kmalloc(sizeof(struct lm87_data), GFP_KERNEL))) {
558		err = -ENOMEM;
559		goto exit;
560	}
561	memset(data, 0, sizeof(struct lm87_data));
562
563	/* The common I2C client data is placed right before the
564	   LM87-specific data. */
565	new_client = &data->client;
566	i2c_set_clientdata(new_client, data);
567	new_client->addr = address;
568	new_client->adapter = adapter;
569	new_client->driver = &lm87_driver;
570	new_client->flags = 0;
571
572	/* Default to an LM87 if forced */
573	if (kind == 0)
574		kind = lm87;
575
576	/* Now, we do the remaining detection. */
577	if (kind < 0) {
578		u8 rev = lm87_read_value(new_client, LM87_REG_REVISION);
579
580		if (rev < 0x01 || rev > 0x08
581		 || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
582		 || lm87_read_value(new_client, LM87_REG_COMPANY_ID) != 0x02) {
583			dev_dbg(&adapter->dev,
584				"LM87 detection failed at 0x%02x.\n",
585				address);
586			goto exit_free;
587		}
588	}
589
590	/* We can fill in the remaining client fields */
591	strlcpy(new_client->name, "lm87", I2C_NAME_SIZE);
592	data->valid = 0;
593	init_MUTEX(&data->update_lock);
594
595	/* Tell the I2C layer a new client has arrived */
596	if ((err = i2c_attach_client(new_client)))
597		goto exit_free;
598
599	/* Initialize the LM87 chip */
600	lm87_init_client(new_client);
601
602	data->in_scale[0] = 2500;
603	data->in_scale[1] = 2700;
604	data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
605	data->in_scale[3] = 5000;
606	data->in_scale[4] = 12000;
607	data->in_scale[5] = 2700;
608	data->in_scale[6] = 1875;
609	data->in_scale[7] = 1875;
610
611	/* Register sysfs hooks */
612	device_create_file(&new_client->dev, &dev_attr_in1_input);
613	device_create_file(&new_client->dev, &dev_attr_in1_min);
614	device_create_file(&new_client->dev, &dev_attr_in1_max);
615	device_create_file(&new_client->dev, &dev_attr_in2_input);
616	device_create_file(&new_client->dev, &dev_attr_in2_min);
617	device_create_file(&new_client->dev, &dev_attr_in2_max);
618	device_create_file(&new_client->dev, &dev_attr_in3_input);
619	device_create_file(&new_client->dev, &dev_attr_in3_min);
620	device_create_file(&new_client->dev, &dev_attr_in3_max);
621	device_create_file(&new_client->dev, &dev_attr_in4_input);
622	device_create_file(&new_client->dev, &dev_attr_in4_min);
623	device_create_file(&new_client->dev, &dev_attr_in4_max);
624
625	if (data->channel & CHAN_NO_FAN(0)) {
626		device_create_file(&new_client->dev, &dev_attr_in6_input);
627		device_create_file(&new_client->dev, &dev_attr_in6_min);
628		device_create_file(&new_client->dev, &dev_attr_in6_max);
629	} else {
630		device_create_file(&new_client->dev, &dev_attr_fan1_input);
631		device_create_file(&new_client->dev, &dev_attr_fan1_min);
632		device_create_file(&new_client->dev, &dev_attr_fan1_div);
633	}
634	if (data->channel & CHAN_NO_FAN(1)) {
635		device_create_file(&new_client->dev, &dev_attr_in7_input);
636		device_create_file(&new_client->dev, &dev_attr_in7_min);
637		device_create_file(&new_client->dev, &dev_attr_in7_max);
638	} else {
639		device_create_file(&new_client->dev, &dev_attr_fan2_input);
640		device_create_file(&new_client->dev, &dev_attr_fan2_min);
641		device_create_file(&new_client->dev, &dev_attr_fan2_div);
642	}
643
644	device_create_file(&new_client->dev, &dev_attr_temp1_input);
645	device_create_file(&new_client->dev, &dev_attr_temp1_max);
646	device_create_file(&new_client->dev, &dev_attr_temp1_min);
647	device_create_file(&new_client->dev, &dev_attr_temp1_crit);
648	device_create_file(&new_client->dev, &dev_attr_temp2_input);
649	device_create_file(&new_client->dev, &dev_attr_temp2_max);
650	device_create_file(&new_client->dev, &dev_attr_temp2_min);
651	device_create_file(&new_client->dev, &dev_attr_temp2_crit);
652
653	if (data->channel & CHAN_TEMP3) {
654		device_create_file(&new_client->dev, &dev_attr_temp3_input);
655		device_create_file(&new_client->dev, &dev_attr_temp3_max);
656		device_create_file(&new_client->dev, &dev_attr_temp3_min);
657		device_create_file(&new_client->dev, &dev_attr_temp3_crit);
658	} else {
659		device_create_file(&new_client->dev, &dev_attr_in0_input);
660		device_create_file(&new_client->dev, &dev_attr_in0_min);
661		device_create_file(&new_client->dev, &dev_attr_in0_max);
662		device_create_file(&new_client->dev, &dev_attr_in5_input);
663		device_create_file(&new_client->dev, &dev_attr_in5_min);
664		device_create_file(&new_client->dev, &dev_attr_in5_max);
665	}
666
667	if (!(data->channel & CHAN_NO_VID)) {
668		device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
669		device_create_file(&new_client->dev, &dev_attr_vrm);
670	}
671
672	device_create_file(&new_client->dev, &dev_attr_alarms);
673	device_create_file(&new_client->dev, &dev_attr_aout_output);
674
675	return 0;
676
677exit_free:
678	kfree(data);
679exit:
680	return err;
681}
682
683static void lm87_init_client(struct i2c_client *client)
684{
685	struct lm87_data *data = i2c_get_clientdata(client);
686	u8 config;
687
688	data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
689	data->vrm = i2c_which_vrm();
690
691	config = lm87_read_value(client, LM87_REG_CONFIG);
692	if (!(config & 0x01)) {
693		int i;
694
695		/* Limits are left uninitialized after power-up */
696		for (i = 1; i < 6; i++) {
697			lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
698			lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
699		}
700		for (i = 0; i < 2; i++) {
701			lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
702			lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
703			lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
704			lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
705		}
706		if (data->channel & CHAN_TEMP3) {
707			lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
708			lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
709		} else {
710			lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
711			lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
712		}
713	}
714	if ((config & 0x81) != 0x01) {
715		/* Start monitoring */
716		lm87_write_value(client, LM87_REG_CONFIG,
717				 (config & 0xF7) | 0x01);
718	}
719}
720
721static int lm87_detach_client(struct i2c_client *client)
722{
723	int err;
724
725	if ((err = i2c_detach_client(client))) {
726		dev_err(&client->dev, "Client deregistration failed, "
727			"client not detached.\n");
728		return err;
729	}
730
731	kfree(i2c_get_clientdata(client));
732	return 0;
733}
734
735static struct lm87_data *lm87_update_device(struct device *dev)
736{
737	struct i2c_client *client = to_i2c_client(dev);
738	struct lm87_data *data = i2c_get_clientdata(client);
739
740	down(&data->update_lock);
741
742	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
743		int i, j;
744
745		dev_dbg(&client->dev, "Updating data.\n");
746
747		i = (data->channel & CHAN_TEMP3) ? 1 : 0;
748		j = (data->channel & CHAN_TEMP3) ? 5 : 6;
749		for (; i < j; i++) {
750			data->in[i] = lm87_read_value(client,
751				      LM87_REG_IN(i));
752			data->in_min[i] = lm87_read_value(client,
753					  LM87_REG_IN_MIN(i));
754			data->in_max[i] = lm87_read_value(client,
755					  LM87_REG_IN_MAX(i));
756		}
757
758		for (i = 0; i < 2; i++) {
759			if (data->channel & CHAN_NO_FAN(i)) {
760				data->in[6+i] = lm87_read_value(client,
761						LM87_REG_AIN(i));
762				data->in_max[6+i] = lm87_read_value(client,
763						    LM87_REG_AIN_MAX(i));
764				data->in_min[6+i] = lm87_read_value(client,
765						    LM87_REG_AIN_MIN(i));
766
767			} else {
768				data->fan[i] = lm87_read_value(client,
769					       LM87_REG_FAN(i));
770				data->fan_min[i] = lm87_read_value(client,
771						   LM87_REG_FAN_MIN(i));
772			}
773		}
774
775		j = (data->channel & CHAN_TEMP3) ? 3 : 2;
776		for (i = 0 ; i < j; i++) {
777			data->temp[i] = lm87_read_value(client,
778					LM87_REG_TEMP[i]);
779			data->temp_high[i] = lm87_read_value(client,
780					     LM87_REG_TEMP_HIGH[i]);
781			data->temp_low[i] = lm87_read_value(client,
782					    LM87_REG_TEMP_LOW[i]);
783		}
784
785		i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
786		j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
787		data->temp_crit_int = min(i, j);
788
789		i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
790		j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
791		data->temp_crit_ext = min(i, j);
792
793		i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
794		data->fan_div[0] = (i >> 4) & 0x03;
795		data->fan_div[1] = (i >> 6) & 0x03;
796		data->vid = (i & 0x0F)
797			  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
798			     << 4;
799
800		data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
801			     | (lm87_read_value(client, LM87_REG_ALARMS2)
802				<< 8);
803		data->aout = lm87_read_value(client, LM87_REG_AOUT);
804
805		data->last_updated = jiffies;
806		data->valid = 1;
807	}
808
809	up(&data->update_lock);
810
811	return data;
812}
813
814static int __init sensors_lm87_init(void)
815{
816	return i2c_add_driver(&lm87_driver);
817}
818
819static void __exit sensors_lm87_exit(void)
820{
821	i2c_del_driver(&lm87_driver);
822}
823
824MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
825MODULE_DESCRIPTION("LM87 driver");
826MODULE_LICENSE("GPL");
827
828module_init(sensors_lm87_init);
829module_exit(sensors_lm87_exit);