Merge branch 'for-2.6.32' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[pandora-kernel.git] / drivers / hwmon / thmc50.c
1 /*
2     thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
3              monitoring
4     Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
5     Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
6     Philip Edelbrock <phil@netroedge.com>
7
8     This program is free software; you can redistribute it and/or modify
9     it under the terms of the GNU General Public License as published by
10     the Free Software Foundation; either version 2 of the License, or
11     (at your option) any later version.
12
13     This program is distributed in the hope that it will be useful,
14     but WITHOUT ANY WARRANTY; without even the implied warranty of
15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16     GNU General Public License for more details.
17
18     You should have received a copy of the GNU General Public License
19     along with this program; if not, write to the Free Software
20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/err.h>
30 #include <linux/mutex.h>
31
32 MODULE_LICENSE("GPL");
33
34 /* Addresses to scan */
35 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
36
37 /* Insmod parameters */
38 I2C_CLIENT_INSMOD_2(thmc50, adm1022);
39 I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs "
40                         "to enable 3rd temperature (ADM1022 only)");
41
42 /* Many THMC50 constants specified below */
43
44 /* The THMC50 registers */
45 #define THMC50_REG_CONF                         0x40
46 #define THMC50_REG_COMPANY_ID                   0x3E
47 #define THMC50_REG_DIE_CODE                     0x3F
48 #define THMC50_REG_ANALOG_OUT                   0x19
49 /*
50  * The mirror status register cannot be used as
51  * reading it does not clear alarms.
52  */
53 #define THMC50_REG_INTR                         0x41
54
55 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
56 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
57 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
58 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 };
59 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 };
60
61 #define THMC50_REG_CONF_nFANOFF                 0x20
62 #define THMC50_REG_CONF_PROGRAMMED              0x08
63
64 /* Each client has this additional data */
65 struct thmc50_data {
66         struct device *hwmon_dev;
67
68         struct mutex update_lock;
69         enum chips type;
70         unsigned long last_updated;     /* In jiffies */
71         char has_temp3;         /* !=0 if it is ADM1022 in temp3 mode */
72         char valid;             /* !=0 if following fields are valid */
73
74         /* Register values */
75         s8 temp_input[3];
76         s8 temp_max[3];
77         s8 temp_min[3];
78         s8 temp_critical[3];
79         u8 analog_out;
80         u8 alarms;
81 };
82
83 static int thmc50_detect(struct i2c_client *client, int kind,
84                          struct i2c_board_info *info);
85 static int thmc50_probe(struct i2c_client *client,
86                         const struct i2c_device_id *id);
87 static int thmc50_remove(struct i2c_client *client);
88 static void thmc50_init_client(struct i2c_client *client);
89 static struct thmc50_data *thmc50_update_device(struct device *dev);
90
91 static const struct i2c_device_id thmc50_id[] = {
92         { "adm1022", adm1022 },
93         { "thmc50", thmc50 },
94         { }
95 };
96 MODULE_DEVICE_TABLE(i2c, thmc50_id);
97
98 static struct i2c_driver thmc50_driver = {
99         .class = I2C_CLASS_HWMON,
100         .driver = {
101                 .name = "thmc50",
102         },
103         .probe = thmc50_probe,
104         .remove = thmc50_remove,
105         .id_table = thmc50_id,
106         .detect = thmc50_detect,
107         .address_data = &addr_data,
108 };
109
110 static ssize_t show_analog_out(struct device *dev,
111                                struct device_attribute *attr, char *buf)
112 {
113         struct thmc50_data *data = thmc50_update_device(dev);
114         return sprintf(buf, "%d\n", data->analog_out);
115 }
116
117 static ssize_t set_analog_out(struct device *dev,
118                               struct device_attribute *attr,
119                               const char *buf, size_t count)
120 {
121         struct i2c_client *client = to_i2c_client(dev);
122         struct thmc50_data *data = i2c_get_clientdata(client);
123         int tmp = simple_strtoul(buf, NULL, 10);
124         int config;
125
126         mutex_lock(&data->update_lock);
127         data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
128         i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
129                                   data->analog_out);
130
131         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
132         if (data->analog_out == 0)
133                 config &= ~THMC50_REG_CONF_nFANOFF;
134         else
135                 config |= THMC50_REG_CONF_nFANOFF;
136         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
137
138         mutex_unlock(&data->update_lock);
139         return count;
140 }
141
142 /* There is only one PWM mode = DC */
143 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
144                              char *buf)
145 {
146         return sprintf(buf, "0\n");
147 }
148
149 /* Temperatures */
150 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
151                          char *buf)
152 {
153         int nr = to_sensor_dev_attr(attr)->index;
154         struct thmc50_data *data = thmc50_update_device(dev);
155         return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
156 }
157
158 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
159                              char *buf)
160 {
161         int nr = to_sensor_dev_attr(attr)->index;
162         struct thmc50_data *data = thmc50_update_device(dev);
163         return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
164 }
165
166 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
167                             const char *buf, size_t count)
168 {
169         int nr = to_sensor_dev_attr(attr)->index;
170         struct i2c_client *client = to_i2c_client(dev);
171         struct thmc50_data *data = i2c_get_clientdata(client);
172         int val = simple_strtol(buf, NULL, 10);
173
174         mutex_lock(&data->update_lock);
175         data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
176         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
177                                   data->temp_min[nr]);
178         mutex_unlock(&data->update_lock);
179         return count;
180 }
181
182 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
183                              char *buf)
184 {
185         int nr = to_sensor_dev_attr(attr)->index;
186         struct thmc50_data *data = thmc50_update_device(dev);
187         return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
188 }
189
190 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
191                             const char *buf, size_t count)
192 {
193         int nr = to_sensor_dev_attr(attr)->index;
194         struct i2c_client *client = to_i2c_client(dev);
195         struct thmc50_data *data = i2c_get_clientdata(client);
196         int val = simple_strtol(buf, NULL, 10);
197
198         mutex_lock(&data->update_lock);
199         data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
200         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
201                                   data->temp_max[nr]);
202         mutex_unlock(&data->update_lock);
203         return count;
204 }
205
206 static ssize_t show_temp_critical(struct device *dev,
207                                   struct device_attribute *attr,
208                                   char *buf)
209 {
210         int nr = to_sensor_dev_attr(attr)->index;
211         struct thmc50_data *data = thmc50_update_device(dev);
212         return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000);
213 }
214
215 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
216                           char *buf)
217 {
218         int index = to_sensor_dev_attr(attr)->index;
219         struct thmc50_data *data = thmc50_update_device(dev);
220
221         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
222 }
223
224 #define temp_reg(offset)                                                \
225 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,     \
226                         NULL, offset - 1);                              \
227 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
228                         show_temp_min, set_temp_min, offset - 1);       \
229 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
230                         show_temp_max, set_temp_max, offset - 1);       \
231 static SENSOR_DEVICE_ATTR(temp##offset##_crit, S_IRUGO,                 \
232                         show_temp_critical, NULL, offset - 1);
233
234 temp_reg(1);
235 temp_reg(2);
236 temp_reg(3);
237
238 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
239 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
240 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
241 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
242 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
243
244 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
245                           set_analog_out, 0);
246 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
247
248 static struct attribute *thmc50_attributes[] = {
249         &sensor_dev_attr_temp1_max.dev_attr.attr,
250         &sensor_dev_attr_temp1_min.dev_attr.attr,
251         &sensor_dev_attr_temp1_input.dev_attr.attr,
252         &sensor_dev_attr_temp1_crit.dev_attr.attr,
253         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
254         &sensor_dev_attr_temp2_max.dev_attr.attr,
255         &sensor_dev_attr_temp2_min.dev_attr.attr,
256         &sensor_dev_attr_temp2_input.dev_attr.attr,
257         &sensor_dev_attr_temp2_crit.dev_attr.attr,
258         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
259         &sensor_dev_attr_temp2_fault.dev_attr.attr,
260         &sensor_dev_attr_pwm1.dev_attr.attr,
261         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
262         NULL
263 };
264
265 static const struct attribute_group thmc50_group = {
266         .attrs = thmc50_attributes,
267 };
268
269 /* for ADM1022 3rd temperature mode */
270 static struct attribute *temp3_attributes[] = {
271         &sensor_dev_attr_temp3_max.dev_attr.attr,
272         &sensor_dev_attr_temp3_min.dev_attr.attr,
273         &sensor_dev_attr_temp3_input.dev_attr.attr,
274         &sensor_dev_attr_temp3_crit.dev_attr.attr,
275         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
276         &sensor_dev_attr_temp3_fault.dev_attr.attr,
277         NULL
278 };
279
280 static const struct attribute_group temp3_group = {
281         .attrs = temp3_attributes,
282 };
283
284 /* Return 0 if detection is successful, -ENODEV otherwise */
285 static int thmc50_detect(struct i2c_client *client, int kind,
286                          struct i2c_board_info *info)
287 {
288         unsigned company;
289         unsigned revision;
290         unsigned config;
291         struct i2c_adapter *adapter = client->adapter;
292         int err = 0;
293         const char *type_name;
294
295         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
296                 pr_debug("thmc50: detect failed, "
297                          "smbus byte data not supported!\n");
298                 return -ENODEV;
299         }
300
301         pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
302                  client->addr, i2c_adapter_id(client->adapter));
303
304         /* Now, we do the remaining detection. */
305         company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
306         revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
307         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
308
309         if (kind == 0)
310                 kind = thmc50;
311         else if (kind < 0) {
312                 err = -ENODEV;
313                 if (revision >= 0xc0 && ((config & 0x10) == 0)) {
314                         if (company == 0x49) {
315                                 kind = thmc50;
316                                 err = 0;
317                         } else if (company == 0x41) {
318                                 kind = adm1022;
319                                 err = 0;
320                         }
321                 }
322         }
323         if (err == -ENODEV) {
324                 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
325                 return err;
326         }
327
328         if (kind == adm1022) {
329                 int id = i2c_adapter_id(client->adapter);
330                 int i;
331
332                 type_name = "adm1022";
333                 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
334                         if (adm1022_temp3[i] == id &&
335                             adm1022_temp3[i + 1] == client->addr) {
336                                 /* enable 2nd remote temp */
337                                 config |= (1 << 7);
338                                 i2c_smbus_write_byte_data(client,
339                                                           THMC50_REG_CONF,
340                                                           config);
341                                 break;
342                         }
343         } else {
344                 type_name = "thmc50";
345         }
346         pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
347                  type_name, (revision >> 4) - 0xc, revision & 0xf);
348
349         strlcpy(info->type, type_name, I2C_NAME_SIZE);
350
351         return 0;
352 }
353
354 static int thmc50_probe(struct i2c_client *client,
355                         const struct i2c_device_id *id)
356 {
357         struct thmc50_data *data;
358         int err;
359
360         data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL);
361         if (!data) {
362                 pr_debug("thmc50: detect failed, kzalloc failed!\n");
363                 err = -ENOMEM;
364                 goto exit;
365         }
366
367         i2c_set_clientdata(client, data);
368         data->type = id->driver_data;
369         mutex_init(&data->update_lock);
370
371         thmc50_init_client(client);
372
373         /* Register sysfs hooks */
374         if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
375                 goto exit_free;
376
377         /* Register ADM1022 sysfs hooks */
378         if (data->has_temp3)
379                 if ((err = sysfs_create_group(&client->dev.kobj,
380                                               &temp3_group)))
381                         goto exit_remove_sysfs_thmc50;
382
383         /* Register a new directory entry with module sensors */
384         data->hwmon_dev = hwmon_device_register(&client->dev);
385         if (IS_ERR(data->hwmon_dev)) {
386                 err = PTR_ERR(data->hwmon_dev);
387                 goto exit_remove_sysfs;
388         }
389
390         return 0;
391
392 exit_remove_sysfs:
393         if (data->has_temp3)
394                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
395 exit_remove_sysfs_thmc50:
396         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
397 exit_free:
398         kfree(data);
399 exit:
400         return err;
401 }
402
403 static int thmc50_remove(struct i2c_client *client)
404 {
405         struct thmc50_data *data = i2c_get_clientdata(client);
406
407         hwmon_device_unregister(data->hwmon_dev);
408         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
409         if (data->has_temp3)
410                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
411
412         kfree(data);
413
414         return 0;
415 }
416
417 static void thmc50_init_client(struct i2c_client *client)
418 {
419         struct thmc50_data *data = i2c_get_clientdata(client);
420         int config;
421
422         data->analog_out = i2c_smbus_read_byte_data(client,
423                                                     THMC50_REG_ANALOG_OUT);
424         /* set up to at least 1 */
425         if (data->analog_out == 0) {
426                 data->analog_out = 1;
427                 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
428                                           data->analog_out);
429         }
430         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
431         config |= 0x1;  /* start the chip if it is in standby mode */
432         if (data->type == adm1022 && (config & (1 << 7)))
433                 data->has_temp3 = 1;
434         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
435 }
436
437 static struct thmc50_data *thmc50_update_device(struct device *dev)
438 {
439         struct i2c_client *client = to_i2c_client(dev);
440         struct thmc50_data *data = i2c_get_clientdata(client);
441         int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
442
443         mutex_lock(&data->update_lock);
444
445         if (time_after(jiffies, data->last_updated + timeout)
446             || !data->valid) {
447
448                 int temps = data->has_temp3 ? 3 : 2;
449                 int i;
450                 int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
451
452                 prog &= THMC50_REG_CONF_PROGRAMMED;
453
454                 for (i = 0; i < temps; i++) {
455                         data->temp_input[i] = i2c_smbus_read_byte_data(client,
456                                                 THMC50_REG_TEMP[i]);
457                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
458                                                 THMC50_REG_TEMP_MAX[i]);
459                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
460                                                 THMC50_REG_TEMP_MIN[i]);
461                         data->temp_critical[i] =
462                                 i2c_smbus_read_byte_data(client,
463                                         prog ? THMC50_REG_TEMP_CRITICAL[i]
464                                              : THMC50_REG_TEMP_DEFAULT[i]);
465                 }
466                 data->analog_out =
467                     i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
468                 data->alarms =
469                     i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
470                 data->last_updated = jiffies;
471                 data->valid = 1;
472         }
473
474         mutex_unlock(&data->update_lock);
475
476         return data;
477 }
478
479 static int __init sm_thmc50_init(void)
480 {
481         return i2c_add_driver(&thmc50_driver);
482 }
483
484 static void __exit sm_thmc50_exit(void)
485 {
486         i2c_del_driver(&thmc50_driver);
487 }
488
489 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
490 MODULE_DESCRIPTION("THMC50 driver");
491
492 module_init(sm_thmc50_init);
493 module_exit(sm_thmc50_exit);