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Corentin Labbecae2caa2007-02-14 21:15:04 +01001/*
2 * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
3 *
4 * Copyright (C) 2006 Corentin LABBE <corentin.labbe@geomatys.fr>
5 *
6 * Based on LM83 Driver by Jean Delvare <khali@linux-fr.org>
7 *
8 * Give only processor, motherboard temperatures and fan tachs
9 * Very rare chip please let me know if you use it
10 *
11 * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
12 *
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation version 2 of the License
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28#include <linux/module.h>
29#include <linux/init.h>
30#include <linux/slab.h>
31#include <linux/jiffies.h>
32#include <linux/i2c.h>
33#include <linux/hwmon-sysfs.h>
34#include <linux/hwmon.h>
35#include <linux/err.h>
36#include <linux/mutex.h>
37
38/*
39 * Addresses to scan
40 */
41
42static unsigned short normal_i2c[] = {
43 0x28, 0x29, 0x2a,
44 0x2b, 0x2c, 0x2d,
45 0x2e, 0x2f, I2C_CLIENT_END
46};
47
48/*
49 * Insmod parameters
50 */
51
52I2C_CLIENT_INSMOD_1(adm1029);
53
54/*
55 * The ADM1029 registers
56 * Manufacturer ID is 0x41 for Analog Devices
57 */
58
59#define ADM1029_REG_MAN_ID 0x0D
60#define ADM1029_REG_CHIP_ID 0x0E
61#define ADM1029_REG_CONFIG 0x01
62#define ADM1029_REG_NB_FAN_SUPPORT 0x02
63
64#define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06
65
66#define ADM1029_REG_LOCAL_TEMP 0xA0
67#define ADM1029_REG_REMOTE1_TEMP 0xA1
68#define ADM1029_REG_REMOTE2_TEMP 0xA2
69
70#define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
71#define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
72#define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92
73
74#define ADM1029_REG_LOCAL_TEMP_LOW 0x98
75#define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
76#define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A
77
78#define ADM1029_REG_FAN1 0x70
79#define ADM1029_REG_FAN2 0x71
80
81#define ADM1029_REG_FAN1_MIN 0x78
82#define ADM1029_REG_FAN2_MIN 0x79
83
84#define ADM1029_REG_FAN1_CONFIG 0x68
85#define ADM1029_REG_FAN2_CONFIG 0x69
86
87#define TEMP_FROM_REG(val) ((val) * 1000)
88
89#define DIV_FROM_REG(val) ( 1 << (((val) >> 6) - 1))
90
91/* Registers to be checked by adm1029_update_device() */
92static const u8 ADM1029_REG_TEMP[] = {
93 ADM1029_REG_LOCAL_TEMP,
94 ADM1029_REG_REMOTE1_TEMP,
95 ADM1029_REG_REMOTE2_TEMP,
96 ADM1029_REG_LOCAL_TEMP_HIGH,
97 ADM1029_REG_REMOTE1_TEMP_HIGH,
98 ADM1029_REG_REMOTE2_TEMP_HIGH,
99 ADM1029_REG_LOCAL_TEMP_LOW,
100 ADM1029_REG_REMOTE1_TEMP_LOW,
101 ADM1029_REG_REMOTE2_TEMP_LOW,
102};
103
104static const u8 ADM1029_REG_FAN[] = {
105 ADM1029_REG_FAN1,
106 ADM1029_REG_FAN2,
107 ADM1029_REG_FAN1_MIN,
108 ADM1029_REG_FAN2_MIN,
109};
110
111static const u8 ADM1029_REG_FAN_DIV[] = {
112 ADM1029_REG_FAN1_CONFIG,
113 ADM1029_REG_FAN2_CONFIG,
114};
115
116/*
117 * Functions declaration
118 */
119
120static int adm1029_attach_adapter(struct i2c_adapter *adapter);
121static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind);
122static int adm1029_detach_client(struct i2c_client *client);
123static struct adm1029_data *adm1029_update_device(struct device *dev);
124static int adm1029_init_client(struct i2c_client *client);
125
126/*
127 * Driver data (common to all clients)
128 */
129
130static struct i2c_driver adm1029_driver = {
131 .driver = {
132 .name = "adm1029",
133 },
134 .attach_adapter = adm1029_attach_adapter,
135 .detach_client = adm1029_detach_client,
136};
137
138/*
139 * Client data (each client gets its own)
140 */
141
142struct adm1029_data {
143 struct i2c_client client;
Tony Jones1beeffe2007-08-20 13:46:20 -0700144 struct device *hwmon_dev;
Corentin Labbecae2caa2007-02-14 21:15:04 +0100145 struct mutex update_lock;
146 char valid; /* zero until following fields are valid */
147 unsigned long last_updated; /* in jiffies */
148
149 /* registers values, signed for temperature, unsigned for other stuff */
150 s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
151 u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
152 u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
153};
154
155/*
156 * Sysfs stuff
157 */
158
159static ssize_t
160show_temp(struct device *dev, struct device_attribute *devattr, char *buf)
161{
162 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
163 struct adm1029_data *data = adm1029_update_device(dev);
164 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
165}
166
167static ssize_t
168show_fan(struct device *dev, struct device_attribute *devattr, char *buf)
169{
170 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
171 struct adm1029_data *data = adm1029_update_device(dev);
172 u16 val;
173 if (data->fan[attr->index] == 0 || data->fan_div[attr->index] == 0
174 || data->fan[attr->index] == 255) {
175 return sprintf(buf, "0\n");
176 }
177
178 val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
179 / data->fan[attr->index];
180 return sprintf(buf, "%d\n", val);
181}
182
183static ssize_t
184show_fan_div(struct device *dev, struct device_attribute *devattr, char *buf)
185{
186 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
187 struct adm1029_data *data = adm1029_update_device(dev);
188 if (data->fan_div[attr->index] == 0)
189 return sprintf(buf, "0\n");
190 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
191}
192
193static ssize_t set_fan_div(struct device *dev,
194 struct device_attribute *devattr, const char *buf, size_t count)
195{
196 struct i2c_client *client = to_i2c_client(dev);
197 struct adm1029_data *data = i2c_get_clientdata(client);
198 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
199 long val = simple_strtol(buf, NULL, 10);
200 u8 reg;
201
202 mutex_lock(&data->update_lock);
203
204 /*Read actual config */
205 reg = i2c_smbus_read_byte_data(client,
206 ADM1029_REG_FAN_DIV[attr->index]);
207
208 switch (val) {
209 case 1:
210 val = 1;
211 break;
212 case 2:
213 val = 2;
214 break;
215 case 4:
216 val = 3;
217 break;
218 default:
219 mutex_unlock(&data->update_lock);
220 dev_err(&client->dev, "fan_div value %ld not "
221 "supported. Choose one of 1, 2 or 4!\n", val);
222 return -EINVAL;
223 }
224 /* Update the value */
225 reg = (reg & 0x3F) | (val << 6);
226
227 /* Write value */
228 i2c_smbus_write_byte_data(client,
229 ADM1029_REG_FAN_DIV[attr->index], reg);
230 mutex_unlock(&data->update_lock);
231
232 return count;
233}
234
235/*
236Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others
237 S_IWUSR stand for Is Writable by User
238*/
239static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
240static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
241static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
242
243static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
244static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
245static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
246
247static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
248static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
249static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
250
251static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
252static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
253
254static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
255static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
256
257static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
258 show_fan_div, set_fan_div, 0);
259static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
260 show_fan_div, set_fan_div, 1);
261
262static struct attribute *adm1029_attributes[] = {
263 &sensor_dev_attr_temp1_input.dev_attr.attr,
264 &sensor_dev_attr_temp1_min.dev_attr.attr,
265 &sensor_dev_attr_temp1_max.dev_attr.attr,
266 &sensor_dev_attr_temp2_input.dev_attr.attr,
267 &sensor_dev_attr_temp2_min.dev_attr.attr,
268 &sensor_dev_attr_temp2_max.dev_attr.attr,
269 &sensor_dev_attr_temp3_input.dev_attr.attr,
270 &sensor_dev_attr_temp3_min.dev_attr.attr,
271 &sensor_dev_attr_temp3_max.dev_attr.attr,
272 &sensor_dev_attr_fan1_input.dev_attr.attr,
273 &sensor_dev_attr_fan2_input.dev_attr.attr,
274 &sensor_dev_attr_fan1_min.dev_attr.attr,
275 &sensor_dev_attr_fan2_min.dev_attr.attr,
276 &sensor_dev_attr_fan1_div.dev_attr.attr,
277 &sensor_dev_attr_fan2_div.dev_attr.attr,
278 NULL
279};
280
281static const struct attribute_group adm1029_group = {
282 .attrs = adm1029_attributes,
283};
284
285/*
286 * Real code
287 */
288
289static int adm1029_attach_adapter(struct i2c_adapter *adapter)
290{
291 if (!(adapter->class & I2C_CLASS_HWMON))
292 return 0;
293 return i2c_probe(adapter, &addr_data, adm1029_detect);
294}
295
296/*
297 * The following function does more than just detection. If detection
298 * succeeds, it also registers the new chip.
299 */
300
301static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)
302{
303 struct i2c_client *client;
304 struct adm1029_data *data;
305 int err = 0;
306 const char *name = "";
307 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
308 goto exit;
309
310 if (!(data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL))) {
311 err = -ENOMEM;
312 goto exit;
313 }
314
315 client = &data->client;
316 i2c_set_clientdata(client, data);
317 client->addr = address;
318 client->adapter = adapter;
319 client->driver = &adm1029_driver;
320
321 /* Now we do the detection and identification. A negative kind
322 * means that the driver was loaded with no force parameter
323 * (default), so we must both detect and identify the chip
324 * (actually there is only one possible kind of chip for now, adm1029).
325 * A zero kind means that the driver was loaded with the force
326 * parameter, the detection step shall be skipped. A positive kind
327 * means that the driver was loaded with the force parameter and a
328 * given kind of chip is requested, so both the detection and the
329 * identification steps are skipped. */
330
331 /* Default to an adm1029 if forced */
332 if (kind == 0)
333 kind = adm1029;
334
335 /* ADM1029 doesn't have CHIP ID, check just MAN ID
336 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
337 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
338 * documented
339 */
340
341 if (kind <= 0) { /* identification */
342 u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
343
344 man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
345 chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
346 temp_devices_installed = i2c_smbus_read_byte_data(client,
347 ADM1029_REG_TEMP_DEVICES_INSTALLED);
348 nb_fan_support = i2c_smbus_read_byte_data(client,
349 ADM1029_REG_NB_FAN_SUPPORT);
350 /* 0x41 is Analog Devices */
351 if (man_id == 0x41 && (temp_devices_installed & 0xf9) == 0x01
352 && nb_fan_support == 0x03) {
353 if ((chip_id & 0xF0) == 0x00) {
354 kind = adm1029;
355 } else {
356 /* There are no "official" CHIP ID, so actually
357 * we use Major/Minor revision for that */
358 printk(KERN_INFO
359 "adm1029: Unknown major revision %x, "
360 "please let us know\n", chip_id);
361 }
362 }
363
364 if (kind <= 0) { /* identification failed */
365 pr_debug("adm1029: Unsupported chip (man_id=0x%02X, "
366 "chip_id=0x%02X)\n", man_id, chip_id);
367 goto exit_free;
368 }
369 }
370
371 if (kind == adm1029) {
372 name = "adm1029";
373 }
374
375 /* We can fill in the remaining client fields */
376 strlcpy(client->name, name, I2C_NAME_SIZE);
377 mutex_init(&data->update_lock);
378
379 /* Tell the I2C layer a new client has arrived */
380 if ((err = i2c_attach_client(client)))
381 goto exit_free;
382
383 /*
384 * Initialize the ADM1029 chip
385 * Check config register
386 */
387 if (adm1029_init_client(client) == 0)
388 goto exit_detach;
389
390 /* Register sysfs hooks */
391 if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
392 goto exit_detach;
393
Tony Jones1beeffe2007-08-20 13:46:20 -0700394 data->hwmon_dev = hwmon_device_register(&client->dev);
395 if (IS_ERR(data->hwmon_dev)) {
396 err = PTR_ERR(data->hwmon_dev);
Corentin Labbecae2caa2007-02-14 21:15:04 +0100397 goto exit_remove_files;
398 }
399
400 return 0;
401
402 exit_remove_files:
403 sysfs_remove_group(&client->dev.kobj, &adm1029_group);
404 exit_detach:
405 i2c_detach_client(client);
406 exit_free:
407 kfree(data);
408 exit:
409 return err;
410}
411
412static int adm1029_init_client(struct i2c_client *client)
413{
414 u8 config;
415 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
416 if ((config & 0x10) == 0) {
417 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
418 config | 0x10);
419 }
420 /* recheck config */
421 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
422 if ((config & 0x10) == 0) {
423 dev_err(&client->dev, "Initialization failed!\n");
424 return 0;
425 }
426 return 1;
427}
428
429static int adm1029_detach_client(struct i2c_client *client)
430{
431 struct adm1029_data *data = i2c_get_clientdata(client);
432 int err;
433
Tony Jones1beeffe2007-08-20 13:46:20 -0700434 hwmon_device_unregister(data->hwmon_dev);
Corentin Labbecae2caa2007-02-14 21:15:04 +0100435 sysfs_remove_group(&client->dev.kobj, &adm1029_group);
436
437 if ((err = i2c_detach_client(client)))
438 return err;
439
440 kfree(data);
441 return 0;
442}
443
444/*
445function that update the status of the chips (temperature for exemple)
446*/
447static struct adm1029_data *adm1029_update_device(struct device *dev)
448{
449 struct i2c_client *client = to_i2c_client(dev);
450 struct adm1029_data *data = i2c_get_clientdata(client);
451
452 mutex_lock(&data->update_lock);
453 /*
454 * Use the "cache" Luke, don't recheck values
455 * if there are already checked not a long time later
456 */
457 if (time_after(jiffies, data->last_updated + HZ * 2)
458 || !data->valid) {
459 int nr;
460
461 dev_dbg(&client->dev, "Updating adm1029 data\n");
462
463 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
464 data->temp[nr] =
465 i2c_smbus_read_byte_data(client,
466 ADM1029_REG_TEMP[nr]);
467 }
468 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
469 data->fan[nr] =
470 i2c_smbus_read_byte_data(client,
471 ADM1029_REG_FAN[nr]);
472 }
473 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
474 data->fan_div[nr] =
475 i2c_smbus_read_byte_data(client,
476 ADM1029_REG_FAN_DIV[nr]);
477 }
478
479 data->last_updated = jiffies;
480 data->valid = 1;
481 }
482
483 mutex_unlock(&data->update_lock);
484
485 return data;
486}
487
488/*
489 Common module stuff
490*/
491static int __init sensors_adm1029_init(void)
492{
493
494 return i2c_add_driver(&adm1029_driver);
495}
496
497static void __exit sensors_adm1029_exit(void)
498{
499
500 i2c_del_driver(&adm1029_driver);
501}
502
503MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
504MODULE_DESCRIPTION("adm1029 driver");
505MODULE_LICENSE("GPL v2");
506
507module_init(sensors_adm1029_init);
508module_exit(sensors_adm1029_exit);