Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / drivers / hwmon / smsc47m1.c
1 /*
2     smsc47m1.c - Part of lm_sensors, Linux kernel modules
3                  for hardware monitoring
4
5     Supports the SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x,
6     LPC47M15x, LPC47M192 and LPC47M997 Super-I/O chips.
7
8     Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
9     Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
10     Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
11                         and Jean Delvare
12
13     This program is free software; you can redistribute it and/or modify
14     it under the terms of the GNU General Public License as published by
15     the Free Software Foundation; either version 2 of the License, or
16     (at your option) any later version.
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/slab.h>
30 #include <linux/ioport.h>
31 #include <linux/jiffies.h>
32 #include <linux/i2c.h>
33 #include <linux/i2c-isa.h>
34 #include <linux/hwmon.h>
35 #include <linux/err.h>
36 #include <linux/init.h>
37 #include <linux/mutex.h>
38 #include <linux/sysfs.h>
39 #include <asm/io.h>
40
41 /* Address is autodetected, there is no default value */
42 static unsigned short address;
43
44 /* Super-I/0 registers and commands */
45
46 #define REG     0x2e    /* The register to read/write */
47 #define VAL     0x2f    /* The value to read/write */
48
49 static inline void
50 superio_outb(int reg, int val)
51 {
52         outb(reg, REG);
53         outb(val, VAL);
54 }
55
56 static inline int
57 superio_inb(int reg)
58 {
59         outb(reg, REG);
60         return inb(VAL);
61 }
62
63 /* logical device for fans is 0x0A */
64 #define superio_select() superio_outb(0x07, 0x0A)
65
66 static inline void
67 superio_enter(void)
68 {
69         outb(0x55, REG);
70 }
71
72 static inline void
73 superio_exit(void)
74 {
75         outb(0xAA, REG);
76 }
77
78 #define SUPERIO_REG_ACT         0x30
79 #define SUPERIO_REG_BASE        0x60
80 #define SUPERIO_REG_DEVID       0x20
81
82 /* Logical device registers */
83
84 #define SMSC_EXTENT             0x80
85
86 /* nr is 0 or 1 in the macros below */
87 #define SMSC47M1_REG_ALARM              0x04
88 #define SMSC47M1_REG_TPIN(nr)           (0x34 - (nr))
89 #define SMSC47M1_REG_PPIN(nr)           (0x36 - (nr))
90 #define SMSC47M1_REG_PWM(nr)            (0x56 + (nr))
91 #define SMSC47M1_REG_FANDIV             0x58
92 #define SMSC47M1_REG_FAN(nr)            (0x59 + (nr))
93 #define SMSC47M1_REG_FAN_PRELOAD(nr)    (0x5B + (nr))
94
95 #define MIN_FROM_REG(reg,div)           ((reg)>=192 ? 0 : \
96                                          983040/((192-(reg))*(div)))
97 #define FAN_FROM_REG(reg,div,preload)   ((reg)<=(preload) || (reg)==255 ? 0 : \
98                                          983040/(((reg)-(preload))*(div)))
99 #define DIV_FROM_REG(reg)               (1 << (reg))
100 #define PWM_FROM_REG(reg)               (((reg) & 0x7E) << 1)
101 #define PWM_EN_FROM_REG(reg)            ((~(reg)) & 0x01)
102 #define PWM_TO_REG(reg)                 (((reg) >> 1) & 0x7E)
103
104 struct smsc47m1_data {
105         struct i2c_client client;
106         struct class_device *class_dev;
107         struct mutex lock;
108
109         struct mutex update_lock;
110         unsigned long last_updated;     /* In jiffies */
111
112         u8 fan[2];              /* Register value */
113         u8 fan_preload[2];      /* Register value */
114         u8 fan_div[2];          /* Register encoding, shifted right */
115         u8 alarms;              /* Register encoding */
116         u8 pwm[2];              /* Register value (bit 7 is enable) */
117 };
118
119
120 static int smsc47m1_detect(struct i2c_adapter *adapter);
121 static int smsc47m1_detach_client(struct i2c_client *client);
122
123 static int smsc47m1_read_value(struct i2c_client *client, u8 reg);
124 static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value);
125
126 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
127                 int init);
128
129
130 static struct i2c_driver smsc47m1_driver = {
131         .driver = {
132                 .owner  = THIS_MODULE,
133                 .name   = "smsc47m1",
134         },
135         .attach_adapter = smsc47m1_detect,
136         .detach_client  = smsc47m1_detach_client,
137 };
138
139 /* nr is 0 or 1 in the callback functions below */
140
141 static ssize_t get_fan(struct device *dev, char *buf, int nr)
142 {
143         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
144         /* This chip (stupidly) stops monitoring fan speed if PWM is
145            enabled and duty cycle is 0%. This is fine if the monitoring
146            and control concern the same fan, but troublesome if they are
147            not (which could as well happen). */
148         int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
149                   FAN_FROM_REG(data->fan[nr],
150                                DIV_FROM_REG(data->fan_div[nr]),
151                                data->fan_preload[nr]);
152         return sprintf(buf, "%d\n", rpm);
153 }
154
155 static ssize_t get_fan_min(struct device *dev, char *buf, int nr)
156 {
157         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
158         int rpm = MIN_FROM_REG(data->fan_preload[nr],
159                                DIV_FROM_REG(data->fan_div[nr]));
160         return sprintf(buf, "%d\n", rpm);
161 }
162
163 static ssize_t get_fan_div(struct device *dev, char *buf, int nr)
164 {
165         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
166         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
167 }
168
169 static ssize_t get_pwm(struct device *dev, char *buf, int nr)
170 {
171         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
172         return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[nr]));
173 }
174
175 static ssize_t get_pwm_en(struct device *dev, char *buf, int nr)
176 {
177         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
178         return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[nr]));
179 }
180
181 static ssize_t get_alarms(struct device *dev, struct device_attribute *attr, char *buf)
182 {
183         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
184         return sprintf(buf, "%d\n", data->alarms);
185 }
186
187 static ssize_t set_fan_min(struct device *dev, const char *buf,
188                 size_t count, int nr)
189 {
190         struct i2c_client *client = to_i2c_client(dev);
191         struct smsc47m1_data *data = i2c_get_clientdata(client);
192         long rpmdiv, val = simple_strtol(buf, NULL, 10);
193
194         mutex_lock(&data->update_lock);
195         rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
196
197         if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
198                 mutex_unlock(&data->update_lock);
199                 return -EINVAL;
200         }
201
202         data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
203         smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
204                              data->fan_preload[nr]);
205         mutex_unlock(&data->update_lock);
206
207         return count;
208 }
209
210 /* Note: we save and restore the fan minimum here, because its value is
211    determined in part by the fan clock divider.  This follows the principle
212    of least surprise; the user doesn't expect the fan minimum to change just
213    because the divider changed. */
214 static ssize_t set_fan_div(struct device *dev, const char *buf,
215                 size_t count, int nr)
216 {
217         struct i2c_client *client = to_i2c_client(dev);
218         struct smsc47m1_data *data = i2c_get_clientdata(client);
219
220         long new_div = simple_strtol(buf, NULL, 10), tmp;
221         u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
222
223         if (new_div == old_div) /* No change */
224                 return count;
225
226         mutex_lock(&data->update_lock);
227         switch (new_div) {
228         case 1: data->fan_div[nr] = 0; break;
229         case 2: data->fan_div[nr] = 1; break;
230         case 4: data->fan_div[nr] = 2; break;
231         case 8: data->fan_div[nr] = 3; break;
232         default:
233                 mutex_unlock(&data->update_lock);
234                 return -EINVAL;
235         }
236
237         tmp = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV) & 0x0F;
238         tmp |= (data->fan_div[0] << 4) | (data->fan_div[1] << 6);
239         smsc47m1_write_value(client, SMSC47M1_REG_FANDIV, tmp);
240
241         /* Preserve fan min */
242         tmp = 192 - (old_div * (192 - data->fan_preload[nr])
243                      + new_div / 2) / new_div;
244         data->fan_preload[nr] = SENSORS_LIMIT(tmp, 0, 191);
245         smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
246                              data->fan_preload[nr]);
247         mutex_unlock(&data->update_lock);
248
249         return count;
250 }
251
252 static ssize_t set_pwm(struct device *dev, const char *buf,
253                 size_t count, int nr)
254 {
255         struct i2c_client *client = to_i2c_client(dev);
256         struct smsc47m1_data *data = i2c_get_clientdata(client);
257
258         long val = simple_strtol(buf, NULL, 10);
259
260         if (val < 0 || val > 255)
261                 return -EINVAL;
262
263         mutex_lock(&data->update_lock);
264         data->pwm[nr] &= 0x81; /* Preserve additional bits */
265         data->pwm[nr] |= PWM_TO_REG(val);
266         smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr),
267                              data->pwm[nr]);
268         mutex_unlock(&data->update_lock);
269
270         return count;
271 }
272
273 static ssize_t set_pwm_en(struct device *dev, const char *buf,
274                 size_t count, int nr)
275 {
276         struct i2c_client *client = to_i2c_client(dev);
277         struct smsc47m1_data *data = i2c_get_clientdata(client);
278
279         long val = simple_strtol(buf, NULL, 10);
280         
281         if (val != 0 && val != 1)
282                 return -EINVAL;
283
284         mutex_lock(&data->update_lock);
285         data->pwm[nr] &= 0xFE; /* preserve the other bits */
286         data->pwm[nr] |= !val;
287         smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr),
288                              data->pwm[nr]);
289         mutex_unlock(&data->update_lock);
290
291         return count;
292 }
293
294 #define fan_present(offset)                                             \
295 static ssize_t get_fan##offset (struct device *dev, struct device_attribute *attr, char *buf)           \
296 {                                                                       \
297         return get_fan(dev, buf, offset - 1);                           \
298 }                                                                       \
299 static ssize_t get_fan##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)     \
300 {                                                                       \
301         return get_fan_min(dev, buf, offset - 1);                       \
302 }                                                                       \
303 static ssize_t set_fan##offset##_min (struct device *dev, struct device_attribute *attr,                \
304                 const char *buf, size_t count)                          \
305 {                                                                       \
306         return set_fan_min(dev, buf, count, offset - 1);                \
307 }                                                                       \
308 static ssize_t get_fan##offset##_div (struct device *dev, struct device_attribute *attr, char *buf)     \
309 {                                                                       \
310         return get_fan_div(dev, buf, offset - 1);                       \
311 }                                                                       \
312 static ssize_t set_fan##offset##_div (struct device *dev, struct device_attribute *attr,                \
313                 const char *buf, size_t count)                          \
314 {                                                                       \
315         return set_fan_div(dev, buf, count, offset - 1);                \
316 }                                                                       \
317 static ssize_t get_pwm##offset (struct device *dev, struct device_attribute *attr, char *buf)           \
318 {                                                                       \
319         return get_pwm(dev, buf, offset - 1);                           \
320 }                                                                       \
321 static ssize_t set_pwm##offset (struct device *dev, struct device_attribute *attr,                      \
322                 const char *buf, size_t count)                          \
323 {                                                                       \
324         return set_pwm(dev, buf, count, offset - 1);                    \
325 }                                                                       \
326 static ssize_t get_pwm##offset##_en (struct device *dev, struct device_attribute *attr, char *buf)      \
327 {                                                                       \
328         return get_pwm_en(dev, buf, offset - 1);                        \
329 }                                                                       \
330 static ssize_t set_pwm##offset##_en (struct device *dev, struct device_attribute *attr,         \
331                 const char *buf, size_t count)                          \
332 {                                                                       \
333         return set_pwm_en(dev, buf, count, offset - 1);                 \
334 }                                                                       \
335 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan##offset,       \
336                 NULL);                                                  \
337 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
338                 get_fan##offset##_min, set_fan##offset##_min);          \
339 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,                \
340                 get_fan##offset##_div, set_fan##offset##_div);          \
341 static DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,                      \
342                 get_pwm##offset, set_pwm##offset);                      \
343 static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,             \
344                 get_pwm##offset##_en, set_pwm##offset##_en);
345
346 fan_present(1);
347 fan_present(2);
348
349 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
350
351 /* Almost all sysfs files may or may not be created depending on the chip
352    setup so we create them individually. It is still convenient to define a
353    group to remove them all at once. */
354 static struct attribute *smsc47m1_attributes[] = {
355         &dev_attr_fan1_input.attr,
356         &dev_attr_fan1_min.attr,
357         &dev_attr_fan1_div.attr,
358         &dev_attr_fan2_input.attr,
359         &dev_attr_fan2_min.attr,
360         &dev_attr_fan2_div.attr,
361
362         &dev_attr_pwm1.attr,
363         &dev_attr_pwm1_enable.attr,
364         &dev_attr_pwm2.attr,
365         &dev_attr_pwm2_enable.attr,
366
367         &dev_attr_alarms.attr,
368         NULL
369 };
370
371 static const struct attribute_group smsc47m1_group = {
372         .attrs = smsc47m1_attributes,
373 };
374
375 static int __init smsc47m1_find(unsigned short *addr)
376 {
377         u8 val;
378
379         superio_enter();
380         val = superio_inb(SUPERIO_REG_DEVID);
381
382         /*
383          * SMSC LPC47M10x/LPC47M13x (device id 0x59), LPC47M14x (device id
384          * 0x5F) and LPC47B27x (device id 0x51) have fan control.
385          * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
386          * can do much more besides (device id 0x60).
387          * The LPC47M997 is undocumented, but seems to be compatible with
388          * the LPC47M192, and has the same device id.
389          */
390         if (val == 0x51)
391                 printk(KERN_INFO "smsc47m1: Found SMSC LPC47B27x\n");
392         else if (val == 0x59)
393                 printk(KERN_INFO "smsc47m1: Found SMSC LPC47M10x/LPC47M13x\n");
394         else if (val == 0x5F)
395                 printk(KERN_INFO "smsc47m1: Found SMSC LPC47M14x\n");
396         else if (val == 0x60)
397                 printk(KERN_INFO "smsc47m1: Found SMSC "
398                        "LPC47M15x/LPC47M192/LPC47M997\n");
399         else {
400                 superio_exit();
401                 return -ENODEV;
402         }
403
404         superio_select();
405         *addr = (superio_inb(SUPERIO_REG_BASE) << 8)
406               |  superio_inb(SUPERIO_REG_BASE + 1);
407         val = superio_inb(SUPERIO_REG_ACT);
408         if (*addr == 0 || (val & 0x01) == 0) {
409                 printk(KERN_INFO "smsc47m1: Device is disabled, will not use\n");
410                 superio_exit();
411                 return -ENODEV;
412         }
413
414         superio_exit();
415         return 0;
416 }
417
418 static int smsc47m1_detect(struct i2c_adapter *adapter)
419 {
420         struct i2c_client *new_client;
421         struct smsc47m1_data *data;
422         int err = 0;
423         int fan1, fan2, pwm1, pwm2;
424
425         if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.driver.name)) {
426                 dev_err(&adapter->dev, "Region 0x%x already in use!\n", address);
427                 return -EBUSY;
428         }
429
430         if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
431                 err = -ENOMEM;
432                 goto error_release;
433         }
434
435         new_client = &data->client;
436         i2c_set_clientdata(new_client, data);
437         new_client->addr = address;
438         mutex_init(&data->lock);
439         new_client->adapter = adapter;
440         new_client->driver = &smsc47m1_driver;
441         new_client->flags = 0;
442
443         strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE);
444         mutex_init(&data->update_lock);
445
446         /* If no function is properly configured, there's no point in
447            actually registering the chip. */
448         fan1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(0)) & 0x05)
449                == 0x05;
450         fan2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(1)) & 0x05)
451                == 0x05;
452         pwm1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(0)) & 0x05)
453                == 0x04;
454         pwm2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(1)) & 0x05)
455                == 0x04;
456         if (!(fan1 || fan2 || pwm1 || pwm2)) {
457                 dev_warn(&adapter->dev, "Device at 0x%x is not configured, "
458                          "will not use\n", new_client->addr);
459                 err = -ENODEV;
460                 goto error_free;
461         }
462
463         if ((err = i2c_attach_client(new_client)))
464                 goto error_free;
465
466         /* Some values (fan min, clock dividers, pwm registers) may be
467            needed before any update is triggered, so we better read them
468            at least once here. We don't usually do it that way, but in
469            this particular case, manually reading 5 registers out of 8
470            doesn't make much sense and we're better using the existing
471            function. */
472         smsc47m1_update_device(&new_client->dev, 1);
473
474         /* Register sysfs hooks */
475         if (fan1) {
476                 if ((err = device_create_file(&new_client->dev,
477                                               &dev_attr_fan1_input))
478                  || (err = device_create_file(&new_client->dev,
479                                               &dev_attr_fan1_min))
480                  || (err = device_create_file(&new_client->dev,
481                                               &dev_attr_fan1_div)))
482                         goto error_remove_files;
483         } else
484                 dev_dbg(&new_client->dev, "Fan 1 not enabled by hardware, "
485                         "skipping\n");
486
487         if (fan2) {
488                 if ((err = device_create_file(&new_client->dev,
489                                               &dev_attr_fan2_input))
490                  || (err = device_create_file(&new_client->dev,
491                                               &dev_attr_fan2_min))
492                  || (err = device_create_file(&new_client->dev,
493                                               &dev_attr_fan2_div)))
494                         goto error_remove_files;
495         } else
496                 dev_dbg(&new_client->dev, "Fan 2 not enabled by hardware, "
497                         "skipping\n");
498
499         if (pwm1) {
500                 if ((err = device_create_file(&new_client->dev,
501                                               &dev_attr_pwm1))
502                  || (err = device_create_file(&new_client->dev,
503                                               &dev_attr_pwm1_enable)))
504                         goto error_remove_files;
505         } else
506                 dev_dbg(&new_client->dev, "PWM 1 not enabled by hardware, "
507                         "skipping\n");
508         if (pwm2) {
509                 if ((err = device_create_file(&new_client->dev,
510                                               &dev_attr_pwm2))
511                  || (err = device_create_file(&new_client->dev,
512                                               &dev_attr_pwm2_enable)))
513                         goto error_remove_files;
514         } else
515                 dev_dbg(&new_client->dev, "PWM 2 not enabled by hardware, "
516                         "skipping\n");
517
518         if ((err = device_create_file(&new_client->dev, &dev_attr_alarms)))
519                 goto error_remove_files;
520
521         data->class_dev = hwmon_device_register(&new_client->dev);
522         if (IS_ERR(data->class_dev)) {
523                 err = PTR_ERR(data->class_dev);
524                 goto error_remove_files;
525         }
526
527         return 0;
528
529 error_remove_files:
530         sysfs_remove_group(&new_client->dev.kobj, &smsc47m1_group);
531         i2c_detach_client(new_client);
532 error_free:
533         kfree(data);
534 error_release:
535         release_region(address, SMSC_EXTENT);
536         return err;
537 }
538
539 static int smsc47m1_detach_client(struct i2c_client *client)
540 {
541         struct smsc47m1_data *data = i2c_get_clientdata(client);
542         int err;
543
544         hwmon_device_unregister(data->class_dev);
545         sysfs_remove_group(&client->dev.kobj, &smsc47m1_group);
546
547         if ((err = i2c_detach_client(client)))
548                 return err;
549
550         release_region(client->addr, SMSC_EXTENT);
551         kfree(data);
552
553         return 0;
554 }
555
556 static int smsc47m1_read_value(struct i2c_client *client, u8 reg)
557 {
558         int res;
559
560         mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
561         res = inb_p(client->addr + reg);
562         mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
563         return res;
564 }
565
566 static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value)
567 {
568         mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
569         outb_p(value, client->addr + reg);
570         mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
571 }
572
573 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
574                 int init)
575 {
576         struct i2c_client *client = to_i2c_client(dev);
577         struct smsc47m1_data *data = i2c_get_clientdata(client);
578
579         mutex_lock(&data->update_lock);
580
581         if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
582                 int i;
583
584                 for (i = 0; i < 2; i++) {
585                         data->fan[i] = smsc47m1_read_value(client,
586                                        SMSC47M1_REG_FAN(i));
587                         data->fan_preload[i] = smsc47m1_read_value(client,
588                                                SMSC47M1_REG_FAN_PRELOAD(i));
589                         data->pwm[i] = smsc47m1_read_value(client,
590                                        SMSC47M1_REG_PWM(i));
591                 }
592
593                 i = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV);
594                 data->fan_div[0] = (i >> 4) & 0x03;
595                 data->fan_div[1] = i >> 6;
596
597                 data->alarms = smsc47m1_read_value(client,
598                                SMSC47M1_REG_ALARM) >> 6;
599                 /* Clear alarms if needed */
600                 if (data->alarms)
601                         smsc47m1_write_value(client, SMSC47M1_REG_ALARM, 0xC0);
602
603                 data->last_updated = jiffies;
604         }
605
606         mutex_unlock(&data->update_lock);
607         return data;
608 }
609
610 static int __init sm_smsc47m1_init(void)
611 {
612         if (smsc47m1_find(&address)) {
613                 return -ENODEV;
614         }
615
616         return i2c_isa_add_driver(&smsc47m1_driver);
617 }
618
619 static void __exit sm_smsc47m1_exit(void)
620 {
621         i2c_isa_del_driver(&smsc47m1_driver);
622 }
623
624 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
625 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
626 MODULE_LICENSE("GPL");
627
628 module_init(sm_smsc47m1_init);
629 module_exit(sm_smsc47m1_exit);