summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/fscpos.c
blob: 6d0146b570201533d99b346e4aa1612c4fbcd06c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
/*
	fscpos.c - Kernel module for hardware monitoring with FSC Poseidon chips
	Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
	fujitsu siemens poseidon chip,
	module based on the old fscpos module by Hermann Jung <hej@odn.de> and
	the fscher module by Reinhard Nissl <rnissl@gmx.de>

	original module based on lm80.c
	Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
	and Philip Edelbrock <phil@netroedge.com>

	Thanks to Jean Delvare for reviewing my code and suggesting a lot of
	improvements.
*/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/hwmon.h>
#include <linux/err.h>

/*
 * Addresses to scan
 */
static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };

/*
 * Insmod parameters
 */
I2C_CLIENT_INSMOD_1(fscpos);

/*
 * The FSCPOS registers
 */

/* chip identification */
#define FSCPOS_REG_IDENT_0		0x00
#define FSCPOS_REG_IDENT_1		0x01
#define FSCPOS_REG_IDENT_2		0x02
#define FSCPOS_REG_REVISION		0x03

/* global control and status */
#define FSCPOS_REG_EVENT_STATE		0x04
#define FSCPOS_REG_CONTROL		0x05

/* watchdog */
#define FSCPOS_REG_WDOG_PRESET		0x28
#define FSCPOS_REG_WDOG_STATE		0x23
#define FSCPOS_REG_WDOG_CONTROL		0x21

/* voltages */
#define FSCPOS_REG_VOLT_12		0x45
#define FSCPOS_REG_VOLT_5		0x42
#define FSCPOS_REG_VOLT_BATT		0x48

/* fans - the chip does not support minimum speed for fan2 */
static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };

/* temperatures */
static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };

/*
 * Functions declaration
 */
static int fscpos_attach_adapter(struct i2c_adapter *adapter);
static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
static int fscpos_detach_client(struct i2c_client *client);

static int fscpos_read_value(struct i2c_client *client, u8 register);
static int fscpos_write_value(struct i2c_client *client, u8 register, u8 value);
static struct fscpos_data *fscpos_update_device(struct device *dev);
static void fscpos_init_client(struct i2c_client *client);

static void reset_fan_alarm(struct i2c_client *client, int nr);

/*
 * Driver data (common to all clients)
 */
static struct i2c_driver fscpos_driver = {
	.driver = {
		.name	= "fscpos",
	},
	.id		= I2C_DRIVERID_FSCPOS,
	.attach_adapter	= fscpos_attach_adapter,
	.detach_client	= fscpos_detach_client,
};

/*
 * Client data (each client gets its own)
 */
struct fscpos_data {
	struct i2c_client client;
	struct class_device *class_dev;
	struct semaphore update_lock;
	char valid; 		/* 0 until following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* register values */
	u8 revision;		/* revision of chip */
	u8 global_event;	/* global event status */
	u8 global_control;	/* global control register */
	u8 wdog_control;	/* watchdog control */
	u8 wdog_state;		/* watchdog status */
	u8 wdog_preset;		/* watchdog preset */
	u8 volt[3];		/* 12, 5, battery current */
	u8 temp_act[3];		/* temperature */
	u8 temp_status[3];	/* status of sensor */
	u8 fan_act[3];		/* fans revolutions per second */
	u8 fan_status[3];	/* fan status */
	u8 pwm[2];		/* fan min value for rps */
	u8 fan_ripple[3];	/* divider for rps */
};

/* Temperature */
#define TEMP_FROM_REG(val)	(((val) - 128) * 1000)

static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
}

static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
{
	/* bits 2..7 reserved => mask with 0x03 */
	return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
}

static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "1\n");
}

static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
			*data, const char *buf,	size_t count, int nr, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	if (v != 1) {
		dev_err(&client->dev, "temp_reset value %ld not supported. "
					"Use 1 to reset the alarm!\n", v);
		return -EINVAL;
	}

	dev_info(&client->dev, "You used the temp_reset feature which has not "
				"been proplerly tested. Please report your "
				"experience to the module author.\n");

	/* Supported value: 2 (clears the status) */
	fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
	return count;
}

/* Fans */
#define RPM_FROM_REG(val)	((val) * 60)

static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
{
	/* bits 0..1, 3..7 reserved => mask with 0x04 */
	return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
}

static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
}

static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
{
	/* bits 2..7 reserved => mask with 0x03 */
	return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
}

static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
			*data, const char *buf,	size_t count, int nr, int reg)
{
	/* supported values: 2, 4, 8 */
	unsigned long v = simple_strtoul(buf, NULL, 10);

	switch (v) {
		case 2: v = 1; break;
		case 4: v = 2; break;
		case 8: v = 3; break;
	default:
		dev_err(&client->dev, "fan_ripple value %ld not supported. "
					"Must be one of 2, 4 or 8!\n", v);
		return -EINVAL;
	}
	
	down(&data->update_lock);
	/* bits 2..7 reserved => mask with 0x03 */
	data->fan_ripple[nr - 1] &= ~0x03;
	data->fan_ripple[nr - 1] |= v;
	
	fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
	up(&data->update_lock);
	return count;
}

static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "%u\n", data->pwm[nr - 1]);
}

static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
				const char *buf, size_t count, int nr, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);

	/* Range: 0..255 */
	if (v < 0) v = 0;
	if (v > 255) v = 255;

	down(&data->update_lock);
	data->pwm[nr - 1] = v;
	fscpos_write_value(client, reg, data->pwm[nr - 1]);
	up(&data->update_lock);
	return count;
}

static void reset_fan_alarm(struct i2c_client *client, int nr)
{
	fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
}

/* Volts */
#define VOLT_FROM_REG(val, mult)	((val) * (mult) / 255)

static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
}

static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
}

static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
}

/* Watchdog */
static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
{
	/* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
	return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
}

static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
				*data, const char *buf,	size_t count, int reg)
{
	/* bits 0..3 reserved => mask with 0xf0 */
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;

	down(&data->update_lock);
	data->wdog_control &= ~0xf0;
	data->wdog_control |= v;
	fscpos_write_value(client, reg, data->wdog_control);
	up(&data->update_lock);
	return count;
}

static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
{
	/* bits 0, 2..7 reserved => mask with 0x02 */
	return sprintf(buf, "%u\n", data->wdog_state & 0x02);
}

static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
				*data, const char *buf, size_t count, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;

	/* Valid values: 2 (clear) */
	if (v != 2) {
		dev_err(&client->dev, "wdog_state value %ld not supported. "
					"Must be 2 to clear the state!\n", v);
		return -EINVAL;
	}

	down(&data->update_lock);
	data->wdog_state &= ~v;
	fscpos_write_value(client, reg, v);
	up(&data->update_lock);
	return count;
}

static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
{
	return sprintf(buf, "%u\n", data->wdog_preset);
}

static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
				*data, const char *buf,	size_t count, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;

	down(&data->update_lock);
	data->wdog_preset = v;
	fscpos_write_value(client, reg, data->wdog_preset);
	up(&data->update_lock);
	return count;
}

/* Event */
static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
{
	/* bits 5..7 reserved => mask with 0x1f */
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", data->global_event & 0x9b);
}

/*
 * Sysfs stuff
 */
#define create_getter(kind, sub) \
	static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
	{ \
		struct fscpos_data *data = fscpos_update_device(dev); \
		return show_##kind##sub(data, buf); \
	}

#define create_getter_n(kind, offset, sub) \
	static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
								 	*buf) \
	{ \
		struct fscpos_data *data = fscpos_update_device(dev); \
		return show_##kind##sub(data, buf, offset); \
	}

#define create_setter(kind, sub, reg) \
	static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
							*buf, size_t count) \
	{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct fscpos_data *data = i2c_get_clientdata(client); \
		return set_##kind##sub(client, data, buf, count, reg); \
	}

#define create_setter_n(kind, offset, sub, reg) \
	static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
					const char *buf, size_t count) \
	{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct fscpos_data *data = i2c_get_clientdata(client); \
		return set_##kind##sub(client, data, buf, count, offset, reg);\
	}

#define create_sysfs_device_ro(kind, sub, offset) \
	static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
					sysfs_show_##kind##offset##sub, NULL);

#define create_sysfs_device_rw(kind, sub, offset) \
	static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
		sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);

#define sysfs_ro_n(kind, sub, offset) \
	create_getter_n(kind, offset, sub); \
	create_sysfs_device_ro(kind, sub, offset);

#define sysfs_rw_n(kind, sub, offset, reg) \
	create_getter_n(kind, offset, sub); \
	create_setter_n(kind, offset, sub, reg); \
	create_sysfs_device_rw(kind, sub, offset);

#define sysfs_rw(kind, sub, reg) \
	create_getter(kind, sub); \
	create_setter(kind, sub, reg); \
	create_sysfs_device_rw(kind, sub,);

#define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
	sysfs_fan(offset, reg_status, reg_ripple); \
	sysfs_rw_n(pwm,, offset, reg_min);

#define sysfs_fan(offset, reg_status, reg_ripple) \
	sysfs_ro_n(fan, _input, offset); \
	sysfs_ro_n(fan, _status, offset); \
	sysfs_rw_n(fan, _ripple, offset, reg_ripple);

#define sysfs_temp(offset, reg_status) \
	sysfs_ro_n(temp, _input, offset); \
	sysfs_ro_n(temp, _status, offset); \
	sysfs_rw_n(temp, _reset, offset, reg_status);

#define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
	sysfs_rw(wdog, _control, reg_wdog_control); \
	sysfs_rw(wdog, _preset, reg_wdog_preset); \
	sysfs_rw(wdog, _state, reg_wdog_state);

sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
							FSCPOS_REG_PWM[0]);
sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
							FSCPOS_REG_PWM[1]);
sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);

sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);

sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
						FSCPOS_REG_WDOG_CONTROL);

static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);

static int fscpos_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, fscpos_detect);
}

static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct fscpos_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

	/*
	 * OK. For now, we presume we have a valid client. We now create the
	 * client structure, even though we cannot fill it completely yet.
	 * But it allows us to access fscpos_{read,write}_value.
	 */

	if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &fscpos_driver;
	new_client->flags = 0;

	/* Do the remaining detection unless force or force_fscpos parameter */
	if (kind < 0) {
		if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
			!= 0x50) /* 'P' */
		|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
			!= 0x45) /* 'E' */
		|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
			!= 0x47))/* 'G' */
		{
			dev_dbg(&new_client->dev, "fscpos detection failed\n");
			goto exit_free;
		}
	}

	/* Fill in the remaining client fields and put it in the global list */
	strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);

	data->valid = 0;
	init_MUTEX(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(new_client)))
		goto exit_free;

	/* Inizialize the fscpos chip */
	fscpos_init_client(new_client);

	/* Announce that the chip was found */
	dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);

	/* Register sysfs hooks */
	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_detach;
	}

	device_create_file(&new_client->dev, &dev_attr_event);
	device_create_file(&new_client->dev, &dev_attr_in0_input);
	device_create_file(&new_client->dev, &dev_attr_in1_input);
	device_create_file(&new_client->dev, &dev_attr_in2_input);
	device_create_file(&new_client->dev, &dev_attr_wdog_control);
	device_create_file(&new_client->dev, &dev_attr_wdog_preset);
	device_create_file(&new_client->dev, &dev_attr_wdog_state);
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp1_status);
	device_create_file(&new_client->dev, &dev_attr_temp1_reset);
	device_create_file(&new_client->dev, &dev_attr_temp2_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_status);
	device_create_file(&new_client->dev, &dev_attr_temp2_reset);
	device_create_file(&new_client->dev, &dev_attr_temp3_input);
	device_create_file(&new_client->dev, &dev_attr_temp3_status);
	device_create_file(&new_client->dev, &dev_attr_temp3_reset);
	device_create_file(&new_client->dev, &dev_attr_fan1_input);
	device_create_file(&new_client->dev, &dev_attr_fan1_status);
	device_create_file(&new_client->dev, &dev_attr_fan1_ripple);
	device_create_file(&new_client->dev, &dev_attr_pwm1);
	device_create_file(&new_client->dev, &dev_attr_fan2_input);
	device_create_file(&new_client->dev, &dev_attr_fan2_status);
	device_create_file(&new_client->dev, &dev_attr_fan2_ripple);
	device_create_file(&new_client->dev, &dev_attr_pwm2);
	device_create_file(&new_client->dev, &dev_attr_fan3_input);
	device_create_file(&new_client->dev, &dev_attr_fan3_status);
	device_create_file(&new_client->dev, &dev_attr_fan3_ripple);

	return 0;

exit_detach:
	i2c_detach_client(new_client);
exit_free:
	kfree(data);
exit:
	return err;
}

static int fscpos_detach_client(struct i2c_client *client)
{
	struct fscpos_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->class_dev);

	if ((err = i2c_detach_client(client)))
		return err;
	kfree(data);
	return 0;
}

static int fscpos_read_value(struct i2c_client *client, u8 reg)
{
	dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
	return i2c_smbus_read_byte_data(client, reg);
}

static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
	return i2c_smbus_write_byte_data(client, reg, value);
}

/* Called when we have found a new FSCPOS chip */
static void fscpos_init_client(struct i2c_client *client)
{
	struct fscpos_data *data = i2c_get_clientdata(client);

	/* read revision from chip */
	data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
}

static struct fscpos_data *fscpos_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct fscpos_data *data = i2c_get_clientdata(client);

	down(&data->update_lock);

	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
		int i;

		dev_dbg(&client->dev, "Starting fscpos update\n");

		for (i = 0; i < 3; i++) {
			data->temp_act[i] = fscpos_read_value(client,
						FSCPOS_REG_TEMP_ACT[i]);
			data->temp_status[i] = fscpos_read_value(client,
						FSCPOS_REG_TEMP_STATE[i]);
			data->fan_act[i] = fscpos_read_value(client,
						FSCPOS_REG_FAN_ACT[i]);
			data->fan_status[i] = fscpos_read_value(client,
						FSCPOS_REG_FAN_STATE[i]);
			data->fan_ripple[i] = fscpos_read_value(client,
						FSCPOS_REG_FAN_RIPPLE[i]);
			if (i < 2) {
				/* fan2_min is not supported by the chip */
				data->pwm[i] = fscpos_read_value(client,
							FSCPOS_REG_PWM[i]);
			}
			/* reset fan status if speed is back to > 0 */
			if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
				reset_fan_alarm(client, i);
			}
		}

		data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
		data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
		data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);

		data->wdog_preset = fscpos_read_value(client,
							FSCPOS_REG_WDOG_PRESET);
		data->wdog_state = fscpos_read_value(client,
							FSCPOS_REG_WDOG_STATE);
		data->wdog_control = fscpos_read_value(client,
						FSCPOS_REG_WDOG_CONTROL);

		data->global_event = fscpos_read_value(client,
						FSCPOS_REG_EVENT_STATE);

		data->last_updated = jiffies;
		data->valid = 1;
	}
	up(&data->update_lock);
	return data;
}

static int __init sm_fscpos_init(void)
{
	return i2c_add_driver(&fscpos_driver);
}

static void __exit sm_fscpos_exit(void)
{
	i2c_del_driver(&fscpos_driver);
}

MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
				"<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
				" and Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
MODULE_LICENSE("GPL");

module_init(sm_fscpos_init);
module_exit(sm_fscpos_exit);
OpenPOWER on IntegriCloud