1 /*
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
42 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
43 0x2e, 0x2f, I2C_CLIENT_END
44 };
45
46 /*
47 * Insmod parameters
48 */
49
50 I2C_CLIENT_INSMOD_1(adm1029);
51
52 /*
53 * The ADM1029 registers
54 * Manufacturer ID is 0x41 for Analog Devices
55 */
56
57 #define ADM1029_REG_MAN_ID 0x0D
58 #define ADM1029_REG_CHIP_ID 0x0E
59 #define ADM1029_REG_CONFIG 0x01
60 #define ADM1029_REG_NB_FAN_SUPPORT 0x02
61
62 #define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06
63
64 #define ADM1029_REG_LOCAL_TEMP 0xA0
65 #define ADM1029_REG_REMOTE1_TEMP 0xA1
66 #define ADM1029_REG_REMOTE2_TEMP 0xA2
67
68 #define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
69 #define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
70 #define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92
71
72 #define ADM1029_REG_LOCAL_TEMP_LOW 0x98
73 #define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
74 #define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A
75
76 #define ADM1029_REG_FAN1 0x70
77 #define ADM1029_REG_FAN2 0x71
78
79 #define ADM1029_REG_FAN1_MIN 0x78
80 #define ADM1029_REG_FAN2_MIN 0x79
81
82 #define ADM1029_REG_FAN1_CONFIG 0x68
83 #define ADM1029_REG_FAN2_CONFIG 0x69
84
85 #define TEMP_FROM_REG(val) ((val) * 1000)
86
87 #define DIV_FROM_REG(val) ( 1 << (((val) >> 6) - 1))
88
89 /* Registers to be checked by adm1029_update_device() */
90 static const u8 ADM1029_REG_TEMP[] = {
91 ADM1029_REG_LOCAL_TEMP,
92 ADM1029_REG_REMOTE1_TEMP,
93 ADM1029_REG_REMOTE2_TEMP,
94 ADM1029_REG_LOCAL_TEMP_HIGH,
95 ADM1029_REG_REMOTE1_TEMP_HIGH,
96 ADM1029_REG_REMOTE2_TEMP_HIGH,
97 ADM1029_REG_LOCAL_TEMP_LOW,
98 ADM1029_REG_REMOTE1_TEMP_LOW,
99 ADM1029_REG_REMOTE2_TEMP_LOW,
100 };
101
102 static const u8 ADM1029_REG_FAN[] = {
103 ADM1029_REG_FAN1,
104 ADM1029_REG_FAN2,
105 ADM1029_REG_FAN1_MIN,
106 ADM1029_REG_FAN2_MIN,
107 };
108
109 static const u8 ADM1029_REG_FAN_DIV[] = {
110 ADM1029_REG_FAN1_CONFIG,
111 ADM1029_REG_FAN2_CONFIG,
112 };
113
114 /*
115 * Functions declaration
116 */
117
118 static int adm1029_probe(struct i2c_client *client,
119 const struct i2c_device_id *id);
120 static int adm1029_detect(struct i2c_client *client, int kind,
121 struct i2c_board_info *info);
122 static int adm1029_remove(struct i2c_client *client);
123 static struct adm1029_data *adm1029_update_device(struct device *dev);
124 static int adm1029_init_client(struct i2c_client *client);
125
126 /*
127 * Driver data (common to all clients)
128 */
129
130 static const struct i2c_device_id adm1029_id[] = {
131 { "adm1029", adm1029 },
132 { }
133 };
134 MODULE_DEVICE_TABLE(i2c, adm1029_id);
135
136 static struct i2c_driver adm1029_driver = {
137 .class = I2C_CLASS_HWMON,
138 .driver = {
139 .name = "adm1029",
140 },
141 .probe = adm1029_probe,
142 .remove = adm1029_remove,
143 .id_table = adm1029_id,
144 .detect = adm1029_detect,
145 .address_data = &addr_data,
146 };
147
148 /*
149 * Client data (each client gets its own)
150 */
151
152 struct adm1029_data {
153 struct device *hwmon_dev;
154 struct mutex update_lock;
155 char valid; /* zero until following fields are valid */
156 unsigned long last_updated; /* in jiffies */
157
158 /* registers values, signed for temperature, unsigned for other stuff */
159 s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
160 u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
161 u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
162 };
163
164 /*
165 * Sysfs stuff
166 */
167
168 static ssize_t
169 show_temp(struct device *dev, struct device_attribute *devattr, char *buf)
170 {
171 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
172 struct adm1029_data *data = adm1029_update_device(dev);
173 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
174 }
175
176 static ssize_t
177 show_fan(struct device *dev, struct device_attribute *devattr, char *buf)
178 {
179 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
180 struct adm1029_data *data = adm1029_update_device(dev);
181 u16 val;
182 if (data->fan[attr->index] == 0
183 || (data->fan_div[attr->index] & 0xC0) == 0
184 || data->fan[attr->index] == 255) {
185 return sprintf(buf, "\n");
186 }
187
188 val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
189 / data->fan[attr->index];
190 return sprintf(buf, "%d\n", val);
191 }
192
193 static ssize_t
194 show_fan_div(struct device *dev, struct device_attribute *devattr, char *buf)
195 {
196 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
197 struct adm1029_data *data = adm1029_update_device(dev);
198 if ((data->fan_div[attr->index] & 0xC0) == 0)
199 return sprintf(buf, "\n");
200 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
201 }
202
203 static ssize_t set_fan_div(struct device *dev,
204 struct device_attribute *devattr, const char *buf, size_t count)
205 {
206 struct i2c_client *client = to_i2c_client(dev);
207 struct adm1029_data *data = i2c_get_clientdata(client);
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
209 long val = simple_strtol(buf, NULL, 10);
210 u8 reg;
211
212 mutex_lock(&data->update_lock);
213
214 /*Read actual config */
215 reg = i2c_smbus_read_byte_data(client,
216 ADM1029_REG_FAN_DIV[attr->index]);
217
218 switch (val) {
219 case 1:
220 val = 1;
221 break;
222 case 2:
223 val = 2;
224 break;
225 case 4:
226 val = 3;
227 break;
228 default:
229 mutex_unlock(&data->update_lock);
230 dev_err(&client->dev, "fan_div value %ld not "
231 "supported. Choose one of 1, 2 or 4!\n", val);
232 return -EINVAL;
233 }
234 /* Update the value */
235 reg = (reg & 0x3F) | (val << 6);
236
237 /* Write value */
238 i2c_smbus_write_byte_data(client,
239 ADM1029_REG_FAN_DIV[attr->index], reg);
240 mutex_unlock(&data->update_lock);
241
242 return count;
243 }
244
245 /*
246 Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others
247 S_IWUSR stand for Is Writable by User
248 */
249 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
250 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
251 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
252
253 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
254 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
255 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
256
257 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
258 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
259 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
260
261 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
262 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
263
264 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
265 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
266
267 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
268 show_fan_div, set_fan_div, 0);
269 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
270 show_fan_div, set_fan_div, 1);
271
272 static struct attribute *adm1029_attributes[] = {
273 &sensor_dev_attr_temp1_input.dev_attr.attr,
274 &sensor_dev_attr_temp1_min.dev_attr.attr,
275 &sensor_dev_attr_temp1_max.dev_attr.attr,
276 &sensor_dev_attr_temp2_input.dev_attr.attr,
277 &sensor_dev_attr_temp2_min.dev_attr.attr,
278 &sensor_dev_attr_temp2_max.dev_attr.attr,
279 &sensor_dev_attr_temp3_input.dev_attr.attr,
280 &sensor_dev_attr_temp3_min.dev_attr.attr,
281 &sensor_dev_attr_temp3_max.dev_attr.attr,
282 &sensor_dev_attr_fan1_input.dev_attr.attr,
283 &sensor_dev_attr_fan2_input.dev_attr.attr,
284 &sensor_dev_attr_fan1_min.dev_attr.attr,
285 &sensor_dev_attr_fan2_min.dev_attr.attr,
286 &sensor_dev_attr_fan1_div.dev_attr.attr,
287 &sensor_dev_attr_fan2_div.dev_attr.attr,
288 NULL
289 };
290
291 static const struct attribute_group adm1029_group = {
292 .attrs = adm1029_attributes,
293 };
294
295 /*
296 * Real code
297 */
298
299 /* Return 0 if detection is successful, -ENODEV otherwise */
300 static int adm1029_detect(struct i2c_client *client, int kind,
301 struct i2c_board_info *info)
302 {
303 struct i2c_adapter *adapter = client->adapter;
304
305 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
306 return -ENODEV;
307
308 /* Now we do the detection and identification. A negative kind
309 * means that the driver was loaded with no force parameter
310 * (default), so we must both detect and identify the chip
311 * (actually there is only one possible kind of chip for now, adm1029).
312 * A zero kind means that the driver was loaded with the force
313 * parameter, the detection step shall be skipped. A positive kind
314 * means that the driver was loaded with the force parameter and a
315 * given kind of chip is requested, so both the detection and the
316 * identification steps are skipped. */
317
318 /* Default to an adm1029 if forced */
319 if (kind == 0)
320 kind = adm1029;
321
322 /* ADM1029 doesn't have CHIP ID, check just MAN ID
323 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
324 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
325 * documented
326 */
327
328 if (kind <= 0) { /* identification */
329 u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
330
331 man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
332 chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
333 temp_devices_installed = i2c_smbus_read_byte_data(client,
334 ADM1029_REG_TEMP_DEVICES_INSTALLED);
335 nb_fan_support = i2c_smbus_read_byte_data(client,
336 ADM1029_REG_NB_FAN_SUPPORT);
337 /* 0x41 is Analog Devices */
338 if (man_id == 0x41 && (temp_devices_installed & 0xf9) == 0x01
339 && nb_fan_support == 0x03) {
340 if ((chip_id & 0xF0) == 0x00) {
341 kind = adm1029;
342 } else {
343 /* There are no "official" CHIP ID, so actually
344 * we use Major/Minor revision for that */
345 printk(KERN_INFO
346 "adm1029: Unknown major revision %x, "
347 "please let us know\n", chip_id);
348 }
349 }
350
351 if (kind <= 0) { /* identification failed */
352 pr_debug("adm1029: Unsupported chip (man_id=0x%02X, "
353 "chip_id=0x%02X)\n", man_id, chip_id);
354 return -ENODEV;
355 }
356 }
357 strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
358
359 return 0;
360 }
361
362 static int adm1029_probe(struct i2c_client *client,
363 const struct i2c_device_id *id)
364 {
365 struct adm1029_data *data;
366 int err;
367
368 data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL);
369 if (!data) {
370 err = -ENOMEM;
371 goto exit;
372 }
373
374 i2c_set_clientdata(client, data);
375 mutex_init(&data->update_lock);
376
377 /*
378 * Initialize the ADM1029 chip
379 * Check config register
380 */
381 if (adm1029_init_client(client) == 0) {
382 err = -ENODEV;
383 goto exit_free;
384 }
385
386 /* Register sysfs hooks */
387 if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
388 goto exit_free;
389
390 data->hwmon_dev = hwmon_device_register(&client->dev);
391 if (IS_ERR(data->hwmon_dev)) {
392 err = PTR_ERR(data->hwmon_dev);
393 goto exit_remove_files;
394 }
395
396 return 0;
397
398 exit_remove_files:
399 sysfs_remove_group(&client->dev.kobj, &adm1029_group);
400 exit_free:
401 kfree(data);
402 exit:
403 return err;
404 }
405
406 static int adm1029_init_client(struct i2c_client *client)
407 {
408 u8 config;
409 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
410 if ((config & 0x10) == 0) {
411 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
412 config | 0x10);
413 }
414 /* recheck config */
415 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
416 if ((config & 0x10) == 0) {
417 dev_err(&client->dev, "Initialization failed!\n");
418 return 0;
419 }
420 return 1;
421 }
422
423 static int adm1029_remove(struct i2c_client *client)
424 {
425 struct adm1029_data *data = i2c_get_clientdata(client);
426
427 hwmon_device_unregister(data->hwmon_dev);
428 sysfs_remove_group(&client->dev.kobj, &adm1029_group);
429
430 kfree(data);
431 return 0;
432 }
433
434 /*
435 function that update the status of the chips (temperature for exemple)
436 */
437 static struct adm1029_data *adm1029_update_device(struct device *dev)
438 {
439 struct i2c_client *client = to_i2c_client(dev);
440 struct adm1029_data *data = i2c_get_clientdata(client);
441
442 mutex_lock(&data->update_lock);
443 /*
444 * Use the "cache" Luke, don't recheck values
445 * if there are already checked not a long time later
446 */
447 if (time_after(jiffies, data->last_updated + HZ * 2)
448 || !data->valid) {
449 int nr;
450
451 dev_dbg(&client->dev, "Updating adm1029 data\n");
452
453 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
454 data->temp[nr] =
455 i2c_smbus_read_byte_data(client,
456 ADM1029_REG_TEMP[nr]);
457 }
458 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
459 data->fan[nr] =
460 i2c_smbus_read_byte_data(client,
461 ADM1029_REG_FAN[nr]);
462 }
463 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
464 data->fan_div[nr] =
465 i2c_smbus_read_byte_data(client,
466 ADM1029_REG_FAN_DIV[nr]);
467 }
468
469 data->last_updated = jiffies;
470 data->valid = 1;
471 }
472
473 mutex_unlock(&data->update_lock);
474
475 return data;
476 }
477
478 /*
479 Common module stuff
480 */
481 static int __init sensors_adm1029_init(void)
482 {
483
484 return i2c_add_driver(&adm1029_driver);
485 }
486
487 static void __exit sensors_adm1029_exit(void)
488 {
489
490 i2c_del_driver(&adm1029_driver);
491 }
492
493 MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
494 MODULE_DESCRIPTION("adm1029 driver");
495 MODULE_LICENSE("GPL v2");
496
497 module_init(sensors_adm1029_init);
498 module_exit(sensors_adm1029_exit);
499
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