summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/adm1021.c
blob: 679cb92ccaf4b7dae5f62c9565c00dd9d19c01b4 (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
/*
    adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (c) 1998, 1999  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/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/err.h>


/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
					0x29, 0x2a, 0x2b,
					0x4c, 0x4d, 0x4e, 
					I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);

/* adm1021 constants specified below */

/* The adm1021 registers */
/* Read-only */
#define ADM1021_REG_TEMP		0x00
#define ADM1021_REG_REMOTE_TEMP		0x01
#define ADM1021_REG_STATUS		0x02
#define ADM1021_REG_MAN_ID		0x0FE	/* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
#define ADM1021_REG_DEV_ID		0x0FF	/* ADM1021 = 0x0X, ADM1023 = 0x3X */
#define ADM1021_REG_DIE_CODE		0x0FF	/* MAX1617A */
/* These use different addresses for reading/writing */
#define ADM1021_REG_CONFIG_R		0x03
#define ADM1021_REG_CONFIG_W		0x09
#define ADM1021_REG_CONV_RATE_R		0x04
#define ADM1021_REG_CONV_RATE_W		0x0A
/* These are for the ADM1023's additional precision on the remote temp sensor */
#define ADM1021_REG_REM_TEMP_PREC	0x010
#define ADM1021_REG_REM_OFFSET		0x011
#define ADM1021_REG_REM_OFFSET_PREC	0x012
#define ADM1021_REG_REM_TOS_PREC	0x013
#define ADM1021_REG_REM_THYST_PREC	0x014
/* limits */
#define ADM1021_REG_TOS_R		0x05
#define ADM1021_REG_TOS_W		0x0B
#define ADM1021_REG_REMOTE_TOS_R	0x07
#define ADM1021_REG_REMOTE_TOS_W	0x0D
#define ADM1021_REG_THYST_R		0x06
#define ADM1021_REG_THYST_W		0x0C
#define ADM1021_REG_REMOTE_THYST_R	0x08
#define ADM1021_REG_REMOTE_THYST_W	0x0E
/* write-only */
#define ADM1021_REG_ONESHOT		0x0F


/* Conversions. Rounding and limit checking is only done on the TO_REG
   variants. Note that you should be a bit careful with which arguments
   these macros are called: arguments may be evaluated more than once.
   Fixing this is just not worth it. */
/* Conversions  note: 1021 uses normal integer signed-byte format*/
#define TEMP_FROM_REG(val)	(val > 127 ? (val-256)*1000 : val*1000)
#define TEMP_TO_REG(val)	(SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255))

/* Initial values */

/* Note: Even though I left the low and high limits named os and hyst, 
they don't quite work like a thermostat the way the LM75 does.  I.e., 
a lower temp than THYST actually triggers an alarm instead of 
clearing it.  Weird, ey?   --Phil  */

/* Each client has this additional data */
struct adm1021_data {
	struct i2c_client client;
	struct class_device *class_dev;
	enum chips type;

	struct semaphore update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u8	temp_max;	/* Register values */
	u8	temp_hyst;
	u8	temp_input;
	u8	remote_temp_max;
	u8	remote_temp_hyst;
	u8	remote_temp_input;
	u8	alarms;
        /* Special values for ADM1023 only */
	u8	remote_temp_prec;
	u8	remote_temp_os_prec;
	u8	remote_temp_hyst_prec;
	u8	remote_temp_offset;
	u8	remote_temp_offset_prec;
};

static int adm1021_attach_adapter(struct i2c_adapter *adapter);
static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
static void adm1021_init_client(struct i2c_client *client);
static int adm1021_detach_client(struct i2c_client *client);
static int adm1021_read_value(struct i2c_client *client, u8 reg);
static int adm1021_write_value(struct i2c_client *client, u8 reg,
			       u16 value);
static struct adm1021_data *adm1021_update_device(struct device *dev);

/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
static int read_only;


/* This is the driver that will be inserted */
static struct i2c_driver adm1021_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "adm1021",
	},
	.id		= I2C_DRIVERID_ADM1021,
	.attach_adapter	= adm1021_attach_adapter,
	.detach_client	= adm1021_detach_client,
};

#define show(value)	\
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct adm1021_data *data = adm1021_update_device(dev);		\
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value));	\
}
show(temp_max);
show(temp_hyst);
show(temp_input);
show(remote_temp_max);
show(remote_temp_hyst);
show(remote_temp_input);

#define show2(value)	\
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct adm1021_data *data = adm1021_update_device(dev);		\
	return sprintf(buf, "%d\n", data->value);			\
}
show2(alarms);

#define set(value, reg)	\
static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)	\
{								\
	struct i2c_client *client = to_i2c_client(dev);		\
	struct adm1021_data *data = i2c_get_clientdata(client);	\
	int temp = simple_strtoul(buf, NULL, 10);		\
								\
	down(&data->update_lock);				\
	data->value = TEMP_TO_REG(temp);			\
	adm1021_write_value(client, reg, data->value);		\
	up(&data->update_lock);					\
	return count;						\
}
set(temp_max, ADM1021_REG_TOS_W);
set(temp_hyst, ADM1021_REG_THYST_W);
set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);

static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);


static int adm1021_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, adm1021_detect);
}

static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
{
	int i;
	struct i2c_client *new_client;
	struct adm1021_data *data;
	int err = 0;
	const char *type_name = "";

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto error0;

	/* 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 adm1021_{read,write}_value. */

	if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto error0;
	}

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &adm1021_driver;
	new_client->flags = 0;

	/* Now, we do the remaining detection. */
	if (kind < 0) {
		if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
		 || (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
		 || (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
			err = -ENODEV;
			goto error1;
		}
	}

	/* Determine the chip type. */
	if (kind <= 0) {
		i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
		if (i == 0x41)
			if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) == 0x030)
				kind = adm1023;
			else
				kind = adm1021;
		else if (i == 0x49)
			kind = thmc10;
		else if (i == 0x23)
			kind = gl523sm;
		else if ((i == 0x4d) &&
			 (adm1021_read_value(new_client, ADM1021_REG_DEV_ID) == 0x01))
			kind = max1617a;
		else if (i == 0x54)
			kind = mc1066;
		/* LM84 Mfr ID in a different place, and it has more unused bits */
		else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00
		      && (kind == 0 /* skip extra detection */
		       || ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00
			&& (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00)))
			kind = lm84;
		else
			kind = max1617;
	}

	if (kind == max1617) {
		type_name = "max1617";
	} else if (kind == max1617a) {
		type_name = "max1617a";
	} else if (kind == adm1021) {
		type_name = "adm1021";
	} else if (kind == adm1023) {
		type_name = "adm1023";
	} else if (kind == thmc10) {
		type_name = "thmc10";
	} else if (kind == lm84) {
		type_name = "lm84";
	} else if (kind == gl523sm) {
		type_name = "gl523sm";
	} else if (kind == mc1066) {
		type_name = "mc1066";
	}

	/* Fill in the remaining client fields and put it into the global list */
	strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
	data->type = kind;
	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 error1;

	/* Initialize the ADM1021 chip */
	if (kind != lm84)
		adm1021_init_client(new_client);

	/* 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 error2;
	}

	device_create_file(&new_client->dev, &dev_attr_temp1_max);
	device_create_file(&new_client->dev, &dev_attr_temp1_min);
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_max);
	device_create_file(&new_client->dev, &dev_attr_temp2_min);
	device_create_file(&new_client->dev, &dev_attr_temp2_input);
	device_create_file(&new_client->dev, &dev_attr_alarms);

	return 0;

error2:
	i2c_detach_client(new_client);
error1:
	kfree(data);
error0:
	return err;
}

static void adm1021_init_client(struct i2c_client *client)
{
	/* Enable ADC and disable suspend mode */
	adm1021_write_value(client, ADM1021_REG_CONFIG_W,
		adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
	/* Set Conversion rate to 1/sec (this can be tinkered with) */
	adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
}

static int adm1021_detach_client(struct i2c_client *client)
{
	struct adm1021_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;
}

/* All registers are byte-sized */
static int adm1021_read_value(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
{
	if (!read_only)
		return i2c_smbus_write_byte_data(client, reg, value);
	return 0;
}

static struct adm1021_data *adm1021_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1021_data *data = i2c_get_clientdata(client);

	down(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		dev_dbg(&client->dev, "Starting adm1021 update\n");

		data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP);
		data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R);
		data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R);
		data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP);
		data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R);
		data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R);
		data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0x7c;
		if (data->type == adm1023) {
			data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC);
			data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC);
			data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC);
			data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET);
			data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC);
		}
		data->last_updated = jiffies;
		data->valid = 1;
	}

	up(&data->update_lock);

	return data;
}

static int __init sensors_adm1021_init(void)
{
	return i2c_add_driver(&adm1021_driver);
}

static void __exit sensors_adm1021_exit(void)
{
	i2c_del_driver(&adm1021_driver);
}

MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
		"Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("adm1021 driver");
MODULE_LICENSE("GPL");

module_param(read_only, bool, 0);
MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");

module_init(sensors_adm1021_init)
module_exit(sensors_adm1021_exit)