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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [hwmon/] [thmc50.c] - Blame information for rev 62

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1 62 marcus.erl
/*
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 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
const static u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
56
const static u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
57
const static u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
58
 
59
#define THMC50_REG_CONF_nFANOFF                 0x20
60
 
61
/* Each client has this additional data */
62
struct thmc50_data {
63
        struct i2c_client client;
64
        struct device *hwmon_dev;
65
 
66
        struct mutex update_lock;
67
        enum chips type;
68
        unsigned long last_updated;     /* In jiffies */
69
        char has_temp3;         /* !=0 if it is ADM1022 in temp3 mode */
70
        char valid;             /* !=0 if following fields are valid */
71
 
72
        /* Register values */
73
        s8 temp_input[3];
74
        s8 temp_max[3];
75
        s8 temp_min[3];
76
        u8 analog_out;
77
        u8 alarms;
78
};
79
 
80
static int thmc50_attach_adapter(struct i2c_adapter *adapter);
81
static int thmc50_detach_client(struct i2c_client *client);
82
static void thmc50_init_client(struct i2c_client *client);
83
static struct thmc50_data *thmc50_update_device(struct device *dev);
84
 
85
static struct i2c_driver thmc50_driver = {
86
        .driver = {
87
                .name = "thmc50",
88
        },
89
        .attach_adapter = thmc50_attach_adapter,
90
        .detach_client = thmc50_detach_client,
91
};
92
 
93
static ssize_t show_analog_out(struct device *dev,
94
                               struct device_attribute *attr, char *buf)
95
{
96
        struct thmc50_data *data = thmc50_update_device(dev);
97
        return sprintf(buf, "%d\n", data->analog_out);
98
}
99
 
100
static ssize_t set_analog_out(struct device *dev,
101
                              struct device_attribute *attr,
102
                              const char *buf, size_t count)
103
{
104
        struct i2c_client *client = to_i2c_client(dev);
105
        struct thmc50_data *data = i2c_get_clientdata(client);
106
        int tmp = simple_strtoul(buf, NULL, 10);
107
        int config;
108
 
109
        mutex_lock(&data->update_lock);
110
        data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
111
        i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
112
                                  data->analog_out);
113
 
114
        config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
115
        if (data->analog_out == 0)
116
                config &= ~THMC50_REG_CONF_nFANOFF;
117
        else
118
                config |= THMC50_REG_CONF_nFANOFF;
119
        i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
120
 
121
        mutex_unlock(&data->update_lock);
122
        return count;
123
}
124
 
125
/* There is only one PWM mode = DC */
126
static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
127
                             char *buf)
128
{
129
        return sprintf(buf, "0\n");
130
}
131
 
132
/* Temperatures */
133
static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
134
                         char *buf)
135
{
136
        int nr = to_sensor_dev_attr(attr)->index;
137
        struct thmc50_data *data = thmc50_update_device(dev);
138
        return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
139
}
140
 
141
static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
142
                             char *buf)
143
{
144
        int nr = to_sensor_dev_attr(attr)->index;
145
        struct thmc50_data *data = thmc50_update_device(dev);
146
        return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
147
}
148
 
149
static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
150
                            const char *buf, size_t count)
151
{
152
        int nr = to_sensor_dev_attr(attr)->index;
153
        struct i2c_client *client = to_i2c_client(dev);
154
        struct thmc50_data *data = i2c_get_clientdata(client);
155
        int val = simple_strtol(buf, NULL, 10);
156
 
157
        mutex_lock(&data->update_lock);
158
        data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
159
        i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
160
                                  data->temp_min[nr]);
161
        mutex_unlock(&data->update_lock);
162
        return count;
163
}
164
 
165
static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
166
                             char *buf)
167
{
168
        int nr = to_sensor_dev_attr(attr)->index;
169
        struct thmc50_data *data = thmc50_update_device(dev);
170
        return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
171
}
172
 
173
static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
174
                            const char *buf, size_t count)
175
{
176
        int nr = to_sensor_dev_attr(attr)->index;
177
        struct i2c_client *client = to_i2c_client(dev);
178
        struct thmc50_data *data = i2c_get_clientdata(client);
179
        int val = simple_strtol(buf, NULL, 10);
180
 
181
        mutex_lock(&data->update_lock);
182
        data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
183
        i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
184
                                  data->temp_max[nr]);
185
        mutex_unlock(&data->update_lock);
186
        return count;
187
}
188
 
189
static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
190
                          char *buf)
191
{
192
        int index = to_sensor_dev_attr(attr)->index;
193
        struct thmc50_data *data = thmc50_update_device(dev);
194
 
195
        return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
196
}
197
 
198
#define temp_reg(offset)                                                \
199
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,     \
200
                        NULL, offset - 1);                              \
201
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
202
                        show_temp_min, set_temp_min, offset - 1);       \
203
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
204
                        show_temp_max, set_temp_max, offset - 1);
205
 
206
temp_reg(1);
207
temp_reg(2);
208
temp_reg(3);
209
 
210
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
211
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
212
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
213
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
214
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
215
 
216
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
217
                          set_analog_out, 0);
218
static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
219
 
220
static struct attribute *thmc50_attributes[] = {
221
        &sensor_dev_attr_temp1_max.dev_attr.attr,
222
        &sensor_dev_attr_temp1_min.dev_attr.attr,
223
        &sensor_dev_attr_temp1_input.dev_attr.attr,
224
        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
225
        &sensor_dev_attr_temp2_max.dev_attr.attr,
226
        &sensor_dev_attr_temp2_min.dev_attr.attr,
227
        &sensor_dev_attr_temp2_input.dev_attr.attr,
228
        &sensor_dev_attr_temp2_alarm.dev_attr.attr,
229
        &sensor_dev_attr_temp2_fault.dev_attr.attr,
230
        &sensor_dev_attr_pwm1.dev_attr.attr,
231
        &sensor_dev_attr_pwm1_mode.dev_attr.attr,
232
        NULL
233
};
234
 
235
static const struct attribute_group thmc50_group = {
236
        .attrs = thmc50_attributes,
237
};
238
 
239
/* for ADM1022 3rd temperature mode */
240
static struct attribute *temp3_attributes[] = {
241
        &sensor_dev_attr_temp3_max.dev_attr.attr,
242
        &sensor_dev_attr_temp3_min.dev_attr.attr,
243
        &sensor_dev_attr_temp3_input.dev_attr.attr,
244
        &sensor_dev_attr_temp3_alarm.dev_attr.attr,
245
        &sensor_dev_attr_temp3_fault.dev_attr.attr,
246
        NULL
247
};
248
 
249
static const struct attribute_group temp3_group = {
250
        .attrs = temp3_attributes,
251
};
252
 
253
static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
254
{
255
        unsigned company;
256
        unsigned revision;
257
        unsigned config;
258
        struct i2c_client *client;
259
        struct thmc50_data *data;
260
        struct device *dev;
261
        int err = 0;
262
        const char *type_name;
263
 
264
        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
265
                pr_debug("thmc50: detect failed, "
266
                         "smbus byte data not supported!\n");
267
                goto exit;
268
        }
269
 
270
        /* OK. For now, we presume we have a valid client. We now create the
271
           client structure, even though we cannot fill it completely yet.
272
           But it allows us to access thmc50 registers. */
273
        if (!(data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL))) {
274
                pr_debug("thmc50: detect failed, kzalloc failed!\n");
275
                err = -ENOMEM;
276
                goto exit;
277
        }
278
 
279
        client = &data->client;
280
        i2c_set_clientdata(client, data);
281
        client->addr = address;
282
        client->adapter = adapter;
283
        client->driver = &thmc50_driver;
284
        dev = &client->dev;
285
 
286
        pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
287
                 client->addr, i2c_adapter_id(client->adapter));
288
 
289
        /* Now, we do the remaining detection. */
290
        company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
291
        revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
292
        config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
293
 
294
        if (kind == 0)
295
                kind = thmc50;
296
        else if (kind < 0) {
297
                err = -ENODEV;
298
                if (revision >= 0xc0 && ((config & 0x10) == 0)) {
299
                        if (company == 0x49) {
300
                                kind = thmc50;
301
                                err = 0;
302
                        } else if (company == 0x41) {
303
                                kind = adm1022;
304
                                err = 0;
305
                        }
306
                }
307
        }
308
        if (err == -ENODEV) {
309
                pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
310
                goto exit_free;
311
        }
312
        data->type = kind;
313
 
314
        if (kind == adm1022) {
315
                int id = i2c_adapter_id(client->adapter);
316
                int i;
317
 
318
                type_name = "adm1022";
319
                data->has_temp3 = (config >> 7) & 1;    /* config MSB */
320
                for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
321
                        if (adm1022_temp3[i] == id &&
322
                            adm1022_temp3[i + 1] == address) {
323
                                /* enable 2nd remote temp */
324
                                data->has_temp3 = 1;
325
                                break;
326
                        }
327
        } else {
328
                type_name = "thmc50";
329
        }
330
        pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
331
                 type_name, (revision >> 4) - 0xc, revision & 0xf);
332
 
333
        /* Fill in the remaining client fields & put it into the global list */
334
        strlcpy(client->name, type_name, I2C_NAME_SIZE);
335
        mutex_init(&data->update_lock);
336
 
337
        /* Tell the I2C layer a new client has arrived */
338
        if ((err = i2c_attach_client(client)))
339
                goto exit_free;
340
 
341
        thmc50_init_client(client);
342
 
343
        /* Register sysfs hooks */
344
        if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
345
                goto exit_detach;
346
 
347
        /* Register ADM1022 sysfs hooks */
348
        if (data->has_temp3)
349
                if ((err = sysfs_create_group(&client->dev.kobj,
350
                                              &temp3_group)))
351
                        goto exit_remove_sysfs_thmc50;
352
 
353
        /* Register a new directory entry with module sensors */
354
        data->hwmon_dev = hwmon_device_register(&client->dev);
355
        if (IS_ERR(data->hwmon_dev)) {
356
                err = PTR_ERR(data->hwmon_dev);
357
                goto exit_remove_sysfs;
358
        }
359
 
360
        return 0;
361
 
362
exit_remove_sysfs:
363
        if (data->has_temp3)
364
                sysfs_remove_group(&client->dev.kobj, &temp3_group);
365
exit_remove_sysfs_thmc50:
366
        sysfs_remove_group(&client->dev.kobj, &thmc50_group);
367
exit_detach:
368
        i2c_detach_client(client);
369
exit_free:
370
        kfree(data);
371
exit:
372
        return err;
373
}
374
 
375
static int thmc50_attach_adapter(struct i2c_adapter *adapter)
376
{
377
        if (!(adapter->class & I2C_CLASS_HWMON))
378
                return 0;
379
        return i2c_probe(adapter, &addr_data, thmc50_detect);
380
}
381
 
382
static int thmc50_detach_client(struct i2c_client *client)
383
{
384
        struct thmc50_data *data = i2c_get_clientdata(client);
385
        int err;
386
 
387
        hwmon_device_unregister(data->hwmon_dev);
388
        sysfs_remove_group(&client->dev.kobj, &thmc50_group);
389
        if (data->has_temp3)
390
                sysfs_remove_group(&client->dev.kobj, &temp3_group);
391
 
392
        if ((err = i2c_detach_client(client)))
393
                return err;
394
 
395
        kfree(data);
396
 
397
        return 0;
398
}
399
 
400
static void thmc50_init_client(struct i2c_client *client)
401
{
402
        struct thmc50_data *data = i2c_get_clientdata(client);
403
        int config;
404
 
405
        data->analog_out = i2c_smbus_read_byte_data(client,
406
                                                    THMC50_REG_ANALOG_OUT);
407
        /* set up to at least 1 */
408
        if (data->analog_out == 0) {
409
                data->analog_out = 1;
410
                i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
411
                                          data->analog_out);
412
        }
413
        config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
414
        config |= 0x1;  /* start the chip if it is in standby mode */
415
        if (data->has_temp3)
416
                config |= 0x80;         /* enable 2nd remote temp */
417
        i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
418
}
419
 
420
static struct thmc50_data *thmc50_update_device(struct device *dev)
421
{
422
        struct i2c_client *client = to_i2c_client(dev);
423
        struct thmc50_data *data = i2c_get_clientdata(client);
424
        int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
425
 
426
        mutex_lock(&data->update_lock);
427
 
428
        if (time_after(jiffies, data->last_updated + timeout)
429
            || !data->valid) {
430
 
431
                int temps = data->has_temp3 ? 3 : 2;
432
                int i;
433
                for (i = 0; i < temps; i++) {
434
                        data->temp_input[i] = i2c_smbus_read_byte_data(client,
435
                                                THMC50_REG_TEMP[i]);
436
                        data->temp_max[i] = i2c_smbus_read_byte_data(client,
437
                                                THMC50_REG_TEMP_MAX[i]);
438
                        data->temp_min[i] = i2c_smbus_read_byte_data(client,
439
                                                THMC50_REG_TEMP_MIN[i]);
440
                }
441
                data->analog_out =
442
                    i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
443
                data->alarms =
444
                    i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
445
                data->last_updated = jiffies;
446
                data->valid = 1;
447
        }
448
 
449
        mutex_unlock(&data->update_lock);
450
 
451
        return data;
452
}
453
 
454
static int __init sm_thmc50_init(void)
455
{
456
        return i2c_add_driver(&thmc50_driver);
457
}
458
 
459
static void __exit sm_thmc50_exit(void)
460
{
461
        i2c_del_driver(&thmc50_driver);
462
}
463
 
464
MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
465
MODULE_DESCRIPTION("THMC50 driver");
466
 
467
module_init(sm_thmc50_init);
468
module_exit(sm_thmc50_exit);

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