aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/thmc50.c
blob: c920f394a5c266f294c1dbef8d37ccf73916c484 (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
/*
    thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
    Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
    Philip Edelbrock <phil@netroedge.com>

    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.
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

MODULE_LICENSE("GPL");

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_2(thmc50, adm1022);
I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs "
			"to enable 3rd temperature (ADM1022 only)");

/* Many THMC50 constants specified below */

/* The THMC50 registers */
#define THMC50_REG_CONF				0x40
#define THMC50_REG_COMPANY_ID			0x3E
#define THMC50_REG_DIE_CODE			0x3F
#define THMC50_REG_ANALOG_OUT			0x19
/*
 * We use mirror status register for reading alarms
 * so ACPI can use the primary status register.
 */
#define THMC50_REG_INTR_MIRROR			0x4C

const static u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
const static u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
const static u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };

#define THMC50_REG_CONF_nFANOFF			0x20

/* Each client has this additional data */
struct thmc50_data {
	struct i2c_client client;
	struct class_device *class_dev;

	struct mutex update_lock;
	enum chips type;
	unsigned long last_updated;	/* In jiffies */
	char has_temp3;		/* !=0 if it is ADM1022 in temp3 mode */
	char valid;		/* !=0 if following fields are valid */

	/* Register values */
	s8 temp_input[3];
	s8 temp_max[3];
	s8 temp_min[3];
	u8 analog_out;
	u8 alarms;
};

static int thmc50_attach_adapter(struct i2c_adapter *adapter);
static int thmc50_detach_client(struct i2c_client *client);
static void thmc50_init_client(struct i2c_client *client);
static struct thmc50_data *thmc50_update_device(struct device *dev);

static struct i2c_driver thmc50_driver = {
	.driver = {
		.name = "thmc50",
	},
	.attach_adapter = thmc50_attach_adapter,
	.detach_client = thmc50_detach_client,
};

static ssize_t show_analog_out(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->analog_out);
}

static ssize_t set_analog_out(struct device *dev,
			      struct device_attribute *attr,
			      const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thmc50_data *data = i2c_get_clientdata(client);
	int tmp = simple_strtoul(buf, NULL, 10);
	int config;

	mutex_lock(&data->update_lock);
	data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
	i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
				  data->analog_out);

	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
	if (data->analog_out == 0)
		config &= ~THMC50_REG_CONF_nFANOFF;
	else
		config |= THMC50_REG_CONF_nFANOFF;
	i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);

	mutex_unlock(&data->update_lock);
	return count;
}

/* There is only one PWM mode = DC */
static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	return sprintf(buf, "0\n");
}

/* Temperatures */
static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
}

static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
}

static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct thmc50_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
	i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
				  data->temp_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
}

static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct thmc50_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
	i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
				  data->temp_max[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);

	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
}

#define temp_reg(offset)						\
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,	\
			NULL, offset - 1);				\
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,	\
			show_temp_min, set_temp_min, offset - 1);	\
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,	\
			show_temp_max, set_temp_max, offset - 1);

temp_reg(1);
temp_reg(2);
temp_reg(3);

static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);

static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
			  set_analog_out, 0);
static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);

static struct attribute *thmc50_attributes[] = {
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm1_mode.dev_attr.attr,
	NULL
};

static const struct attribute_group thmc50_group = {
	.attrs = thmc50_attributes,
};

/* for ADM1022 3rd temperature mode */
static struct attribute *adm1022_attributes[] = {
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,
	NULL
};

static const struct attribute_group adm1022_group = {
	.attrs = adm1022_attributes,
};

static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
{
	unsigned company;
	unsigned revision;
	unsigned config;
	struct i2c_client *client;
	struct thmc50_data *data;
	struct device *dev;
	int err = 0;
	const char *type_name = "";

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		pr_debug("thmc50: detect failed, "
			 "smbus byte data not supported!\n");
		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 thmc50 registers. */
	if (!(data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL))) {
		pr_debug("thmc50: detect failed, kzalloc failed!\n");
		err = -ENOMEM;
		goto exit;
	}

	client = &data->client;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &thmc50_driver;
	dev = &client->dev;

	pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
		 client->addr, i2c_adapter_id(client->adapter));

	/* Now, we do the remaining detection. */
	company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
	revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);

	if (kind == 0)
		kind = thmc50;
	else if (kind < 0) {
		err = -ENODEV;
		if (revision >= 0xc0 && ((config & 0x10) == 0)) {
			if (company == 0x49) {
				kind = thmc50;
				err = 0;
			} else if (company == 0x41) {
				kind = adm1022;
				err = 0;
			}
		}
	}
	if (err == -ENODEV) {
		pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
		goto exit_free;
	}
	pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
		 type_name, (revision >> 4) - 0xc, revision & 0xf);
	data->type = kind;

	if (kind == thmc50)
		type_name = "thmc50";
	else if (kind == adm1022) {
		int id = i2c_adapter_id(client->adapter);
		int i;

		type_name = "adm1022";
		data->has_temp3 = (config >> 7) & 1;	/* config MSB */
		for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
			if (adm1022_temp3[i] == id &&
			    adm1022_temp3[i + 1] == address) {
				/* enable 2nd remote temp */
				data->has_temp3 = 1;
				break;
			}
	}

	/* Fill in the remaining client fields & put it into the global list */
	strlcpy(client->name, type_name, I2C_NAME_SIZE);
	mutex_init(&data->update_lock);

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

	thmc50_init_client(client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
		goto exit_detach;

	/* Register ADM1022 sysfs hooks */
	if (data->type == adm1022)
		if ((err = sysfs_create_group(&client->dev.kobj,
					      &adm1022_group)))
			goto exit_remove_sysfs_thmc50;

	/* Register a new directory entry with module sensors */
	data->class_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_remove_sysfs;
	}

	return 0;

exit_remove_sysfs:
	if (data->type == adm1022)
		sysfs_remove_group(&client->dev.kobj, &adm1022_group);
exit_remove_sysfs_thmc50:
	sysfs_remove_group(&client->dev.kobj, &thmc50_group);
exit_detach:
	i2c_detach_client(client);
exit_free:
	kfree(data);
exit:
	return err;
}

static int thmc50_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, thmc50_detect);
}

static int thmc50_detach_client(struct i2c_client *client)
{
	struct thmc50_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->class_dev);
	sysfs_remove_group(&client->dev.kobj, &thmc50_group);
	if (data->type == adm1022)
		sysfs_remove_group(&client->dev.kobj, &adm1022_group);

	if ((err = i2c_detach_client(client)))
		return err;

	kfree(data);

	return 0;
}

static void thmc50_init_client(struct i2c_client *client)
{
	struct thmc50_data *data = i2c_get_clientdata(client);
	int config;

	data->analog_out = i2c_smbus_read_byte_data(client,
						    THMC50_REG_ANALOG_OUT);
	/* set up to at least 1 */
	if (data->analog_out == 0) {
		data->analog_out = 1;
		i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
					  data->analog_out);
	}
	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
	config |= 0x1;	/* start the chip if it is in standby mode */
	if (data->has_temp3)
		config |= 0x80;		/* enable 2nd remote temp */
	i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
}

static struct thmc50_data *thmc50_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thmc50_data *data = i2c_get_clientdata(client);
	int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + timeout)
	    || !data->valid) {

		int temps = data->has_temp3 ? 3 : 2;
		int i;
		for (i = 0; i < temps; i++) {
			data->temp_input[i] = i2c_smbus_read_byte_data(client,
						THMC50_REG_TEMP[i]);
			data->temp_max[i] = i2c_smbus_read_byte_data(client,
						THMC50_REG_TEMP_MAX[i]);
			data->temp_min[i] = i2c_smbus_read_byte_data(client,
						THMC50_REG_TEMP_MIN[i]);
		}
		data->analog_out =
		    i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
		data->alarms =
		    i2c_smbus_read_byte_data(client, THMC50_REG_INTR_MIRROR);
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sm_thmc50_init(void)
{
	return i2c_add_driver(&thmc50_driver);
}

static void __exit sm_thmc50_exit(void)
{
	i2c_del_driver(&thmc50_driver);
}

MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
MODULE_DESCRIPTION("THMC50 driver");

module_init(sm_thmc50_init);
module_exit(sm_thmc50_exit);