2 smsc47m1.c - Part of lm_sensors, Linux kernel modules
3 for hardware monitoring
5 Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
6 LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
9 Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
10 Copyright (C) 2004-2007 Jean Delvare <khali@linux-fr.org>
11 Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
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; either version 2 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/slab.h>
31 #include <linux/ioport.h>
32 #include <linux/jiffies.h>
33 #include <linux/platform_device.h>
34 #include <linux/hwmon.h>
35 #include <linux/hwmon-sysfs.h>
36 #include <linux/err.h>
37 #include <linux/init.h>
38 #include <linux/mutex.h>
39 #include <linux/sysfs.h>
42 static unsigned short force_id;
43 module_param(force_id, ushort, 0);
44 MODULE_PARM_DESC(force_id, "Override the detected device ID");
46 static struct platform_device *pdev;
48 #define DRVNAME "smsc47m1"
49 enum chips { smsc47m1, smsc47m2 };
51 /* Super-I/0 registers and commands */
53 #define REG 0x2e /* The register to read/write */
54 #define VAL 0x2f /* The value to read/write */
57 superio_outb(int reg, int val)
70 /* logical device for fans is 0x0A */
71 #define superio_select() superio_outb(0x07, 0x0A)
85 #define SUPERIO_REG_ACT 0x30
86 #define SUPERIO_REG_BASE 0x60
87 #define SUPERIO_REG_DEVID 0x20
88 #define SUPERIO_REG_DEVREV 0x21
90 /* Logical device registers */
92 #define SMSC_EXTENT 0x80
94 /* nr is 0 or 1 in the macros below */
95 #define SMSC47M1_REG_ALARM 0x04
96 #define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
97 #define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
98 #define SMSC47M1_REG_FANDIV 0x58
100 static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b };
101 static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c };
102 static const u8 SMSC47M1_REG_PWM[3] = { 0x56, 0x57, 0x69 };
104 #define SMSC47M2_REG_ALARM6 0x09
105 #define SMSC47M2_REG_TPIN1 0x38
106 #define SMSC47M2_REG_TPIN2 0x37
107 #define SMSC47M2_REG_TPIN3 0x2d
108 #define SMSC47M2_REG_PPIN3 0x2c
109 #define SMSC47M2_REG_FANDIV3 0x6a
111 #define MIN_FROM_REG(reg,div) ((reg)>=192 ? 0 : \
112 983040/((192-(reg))*(div)))
113 #define FAN_FROM_REG(reg,div,preload) ((reg)<=(preload) || (reg)==255 ? 0 : \
114 983040/(((reg)-(preload))*(div)))
115 #define DIV_FROM_REG(reg) (1 << (reg))
116 #define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
117 #define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
118 #define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
120 struct smsc47m1_data {
124 struct device *hwmon_dev;
126 struct mutex update_lock;
127 unsigned long last_updated; /* In jiffies */
129 u8 fan[3]; /* Register value */
130 u8 fan_preload[3]; /* Register value */
131 u8 fan_div[3]; /* Register encoding, shifted right */
132 u8 alarms; /* Register encoding */
133 u8 pwm[3]; /* Register value (bit 0 is disable) */
136 struct smsc47m1_sio_data {
141 static int smsc47m1_probe(struct platform_device *pdev);
142 static int __devexit smsc47m1_remove(struct platform_device *pdev);
143 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
146 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
148 return inb_p(data->addr + reg);
151 static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
154 outb_p(value, data->addr + reg);
157 static struct platform_driver smsc47m1_driver = {
159 .owner = THIS_MODULE,
162 .probe = smsc47m1_probe,
163 .remove = __devexit_p(smsc47m1_remove),
166 static ssize_t get_fan(struct device *dev, struct device_attribute
169 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
170 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
171 int nr = attr->index;
172 /* This chip (stupidly) stops monitoring fan speed if PWM is
173 enabled and duty cycle is 0%. This is fine if the monitoring
174 and control concern the same fan, but troublesome if they are
175 not (which could as well happen). */
176 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
177 FAN_FROM_REG(data->fan[nr],
178 DIV_FROM_REG(data->fan_div[nr]),
179 data->fan_preload[nr]);
180 return sprintf(buf, "%d\n", rpm);
183 static ssize_t get_fan_min(struct device *dev, struct device_attribute
186 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
187 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
188 int nr = attr->index;
189 int rpm = MIN_FROM_REG(data->fan_preload[nr],
190 DIV_FROM_REG(data->fan_div[nr]));
191 return sprintf(buf, "%d\n", rpm);
194 static ssize_t get_fan_div(struct device *dev, struct device_attribute
197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
198 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
199 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
202 static ssize_t get_fan_alarm(struct device *dev, struct device_attribute
205 int bitnr = to_sensor_dev_attr(devattr)->index;
206 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
207 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
210 static ssize_t get_pwm(struct device *dev, struct device_attribute
213 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
214 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
215 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
218 static ssize_t get_pwm_en(struct device *dev, struct device_attribute
221 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
222 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
223 return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index]));
226 static ssize_t get_alarms(struct device *dev, struct device_attribute
229 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
230 return sprintf(buf, "%d\n", data->alarms);
233 static ssize_t set_fan_min(struct device *dev, struct device_attribute
234 *devattr, const char *buf, size_t count)
236 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
237 struct smsc47m1_data *data = dev_get_drvdata(dev);
238 int nr = attr->index;
239 long rpmdiv, val = simple_strtol(buf, NULL, 10);
241 mutex_lock(&data->update_lock);
242 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
244 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
245 mutex_unlock(&data->update_lock);
249 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
250 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
251 data->fan_preload[nr]);
252 mutex_unlock(&data->update_lock);
257 /* Note: we save and restore the fan minimum here, because its value is
258 determined in part by the fan clock divider. This follows the principle
259 of least surprise; the user doesn't expect the fan minimum to change just
260 because the divider changed. */
261 static ssize_t set_fan_div(struct device *dev, struct device_attribute
262 *devattr, const char *buf, size_t count)
264 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
265 struct smsc47m1_data *data = dev_get_drvdata(dev);
266 int nr = attr->index;
267 long new_div = simple_strtol(buf, NULL, 10), tmp;
268 u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
270 if (new_div == old_div) /* No change */
273 mutex_lock(&data->update_lock);
275 case 1: data->fan_div[nr] = 0; break;
276 case 2: data->fan_div[nr] = 1; break;
277 case 4: data->fan_div[nr] = 2; break;
278 case 8: data->fan_div[nr] = 3; break;
280 mutex_unlock(&data->update_lock);
287 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
288 & ~(0x03 << (4 + 2 * nr));
289 tmp |= data->fan_div[nr] << (4 + 2 * nr);
290 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
293 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
294 tmp |= data->fan_div[2] << 4;
295 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
299 /* Preserve fan min */
300 tmp = 192 - (old_div * (192 - data->fan_preload[nr])
301 + new_div / 2) / new_div;
302 data->fan_preload[nr] = SENSORS_LIMIT(tmp, 0, 191);
303 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
304 data->fan_preload[nr]);
305 mutex_unlock(&data->update_lock);
310 static ssize_t set_pwm(struct device *dev, struct device_attribute
311 *devattr, const char *buf, size_t count)
313 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
314 struct smsc47m1_data *data = dev_get_drvdata(dev);
315 int nr = attr->index;
316 long val = simple_strtol(buf, NULL, 10);
318 if (val < 0 || val > 255)
321 mutex_lock(&data->update_lock);
322 data->pwm[nr] &= 0x81; /* Preserve additional bits */
323 data->pwm[nr] |= PWM_TO_REG(val);
324 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
326 mutex_unlock(&data->update_lock);
331 static ssize_t set_pwm_en(struct device *dev, struct device_attribute
332 *devattr, const char *buf, size_t count)
334 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
335 struct smsc47m1_data *data = dev_get_drvdata(dev);
336 int nr = attr->index;
337 long val = simple_strtol(buf, NULL, 10);
339 if (val != 0 && val != 1)
342 mutex_lock(&data->update_lock);
343 data->pwm[nr] &= 0xFE; /* preserve the other bits */
344 data->pwm[nr] |= !val;
345 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
347 mutex_unlock(&data->update_lock);
352 #define fan_present(offset) \
353 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan, \
355 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
356 get_fan_min, set_fan_min, offset - 1); \
357 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
358 get_fan_div, set_fan_div, offset - 1); \
359 static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm, \
361 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
362 get_pwm, set_pwm, offset - 1); \
363 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
364 get_pwm_en, set_pwm_en, offset - 1)
370 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
372 static ssize_t show_name(struct device *dev, struct device_attribute
375 struct smsc47m1_data *data = dev_get_drvdata(dev);
377 return sprintf(buf, "%s\n", data->name);
379 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
381 /* Almost all sysfs files may or may not be created depending on the chip
382 setup so we create them individually. It is still convenient to define a
383 group to remove them all at once. */
384 static struct attribute *smsc47m1_attributes[] = {
385 &sensor_dev_attr_fan1_input.dev_attr.attr,
386 &sensor_dev_attr_fan1_min.dev_attr.attr,
387 &sensor_dev_attr_fan1_div.dev_attr.attr,
388 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
389 &sensor_dev_attr_fan2_input.dev_attr.attr,
390 &sensor_dev_attr_fan2_min.dev_attr.attr,
391 &sensor_dev_attr_fan2_div.dev_attr.attr,
392 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
393 &sensor_dev_attr_fan3_input.dev_attr.attr,
394 &sensor_dev_attr_fan3_min.dev_attr.attr,
395 &sensor_dev_attr_fan3_div.dev_attr.attr,
396 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
398 &sensor_dev_attr_pwm1.dev_attr.attr,
399 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
400 &sensor_dev_attr_pwm2.dev_attr.attr,
401 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
402 &sensor_dev_attr_pwm3.dev_attr.attr,
403 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
405 &dev_attr_alarms.attr,
410 static const struct attribute_group smsc47m1_group = {
411 .attrs = smsc47m1_attributes,
414 static int __init smsc47m1_find(unsigned short *addr,
415 struct smsc47m1_sio_data *sio_data)
420 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
423 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
424 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
425 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
426 * can do much more besides (device id 0x60).
427 * The LPC47M997 is undocumented, but seems to be compatible with
428 * the LPC47M192, and has the same device id.
429 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
430 * supports a 3rd fan, and the pin configuration registers are
431 * unfortunately different.
432 * The LPC47M233 has the same device id (0x6B) but is not compatible.
433 * We check the high bit of the device revision register to
434 * differentiate them.
438 pr_info(DRVNAME ": Found SMSC LPC47B27x\n");
439 sio_data->type = smsc47m1;
442 pr_info(DRVNAME ": Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
443 sio_data->type = smsc47m1;
446 pr_info(DRVNAME ": Found SMSC LPC47M14x\n");
447 sio_data->type = smsc47m1;
450 pr_info(DRVNAME ": Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
451 sio_data->type = smsc47m1;
454 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
455 pr_debug(DRVNAME ": "
456 "Found SMSC LPC47M233, unsupported\n");
461 pr_info(DRVNAME ": Found SMSC LPC47M292\n");
462 sio_data->type = smsc47m2;
470 *addr = (superio_inb(SUPERIO_REG_BASE) << 8)
471 | superio_inb(SUPERIO_REG_BASE + 1);
472 val = superio_inb(SUPERIO_REG_ACT);
473 if (*addr == 0 || (val & 0x01) == 0) {
474 pr_info(DRVNAME ": Device is disabled, will not use\n");
483 static int __devinit smsc47m1_probe(struct platform_device *pdev)
485 struct device *dev = &pdev->dev;
486 struct smsc47m1_sio_data *sio_data = dev->platform_data;
487 struct smsc47m1_data *data;
488 struct resource *res;
490 int fan1, fan2, fan3, pwm1, pwm2, pwm3;
492 static const char *names[] = {
497 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
498 if (!request_region(res->start, SMSC_EXTENT, DRVNAME)) {
499 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
500 (unsigned long)res->start,
501 (unsigned long)res->end);
505 if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
510 data->addr = res->start;
511 data->type = sio_data->type;
512 data->name = names[sio_data->type];
513 mutex_init(&data->update_lock);
514 platform_set_drvdata(pdev, data);
516 /* If no function is properly configured, there's no point in
517 actually registering the chip. */
518 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
520 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
522 if (data->type == smsc47m2) {
523 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
525 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
527 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
529 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
532 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
534 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
539 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
540 dev_warn(dev, "Device not configured, will not use\n");
545 /* Some values (fan min, clock dividers, pwm registers) may be
546 needed before any update is triggered, so we better read them
547 at least once here. We don't usually do it that way, but in
548 this particular case, manually reading 5 registers out of 8
549 doesn't make much sense and we're better using the existing
551 smsc47m1_update_device(dev, 1);
553 /* Register sysfs hooks */
555 if ((err = device_create_file(dev,
556 &sensor_dev_attr_fan1_input.dev_attr))
557 || (err = device_create_file(dev,
558 &sensor_dev_attr_fan1_min.dev_attr))
559 || (err = device_create_file(dev,
560 &sensor_dev_attr_fan1_div.dev_attr))
561 || (err = device_create_file(dev,
562 &sensor_dev_attr_fan1_alarm.dev_attr)))
563 goto error_remove_files;
565 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");
568 if ((err = device_create_file(dev,
569 &sensor_dev_attr_fan2_input.dev_attr))
570 || (err = device_create_file(dev,
571 &sensor_dev_attr_fan2_min.dev_attr))
572 || (err = device_create_file(dev,
573 &sensor_dev_attr_fan2_div.dev_attr))
574 || (err = device_create_file(dev,
575 &sensor_dev_attr_fan2_alarm.dev_attr)))
576 goto error_remove_files;
578 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");
581 if ((err = device_create_file(dev,
582 &sensor_dev_attr_fan3_input.dev_attr))
583 || (err = device_create_file(dev,
584 &sensor_dev_attr_fan3_min.dev_attr))
585 || (err = device_create_file(dev,
586 &sensor_dev_attr_fan3_div.dev_attr))
587 || (err = device_create_file(dev,
588 &sensor_dev_attr_fan3_alarm.dev_attr)))
589 goto error_remove_files;
590 } else if (data->type == smsc47m2)
591 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");
594 if ((err = device_create_file(dev,
595 &sensor_dev_attr_pwm1.dev_attr))
596 || (err = device_create_file(dev,
597 &sensor_dev_attr_pwm1_enable.dev_attr)))
598 goto error_remove_files;
600 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");
603 if ((err = device_create_file(dev,
604 &sensor_dev_attr_pwm2.dev_attr))
605 || (err = device_create_file(dev,
606 &sensor_dev_attr_pwm2_enable.dev_attr)))
607 goto error_remove_files;
609 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");
612 if ((err = device_create_file(dev,
613 &sensor_dev_attr_pwm3.dev_attr))
614 || (err = device_create_file(dev,
615 &sensor_dev_attr_pwm3_enable.dev_attr)))
616 goto error_remove_files;
617 } else if (data->type == smsc47m2)
618 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");
620 if ((err = device_create_file(dev, &dev_attr_alarms)))
621 goto error_remove_files;
622 if ((err = device_create_file(dev, &dev_attr_name)))
623 goto error_remove_files;
625 data->hwmon_dev = hwmon_device_register(dev);
626 if (IS_ERR(data->hwmon_dev)) {
627 err = PTR_ERR(data->hwmon_dev);
628 goto error_remove_files;
634 sysfs_remove_group(&dev->kobj, &smsc47m1_group);
636 platform_set_drvdata(pdev, NULL);
639 release_region(res->start, SMSC_EXTENT);
643 static int __devexit smsc47m1_remove(struct platform_device *pdev)
645 struct smsc47m1_data *data = platform_get_drvdata(pdev);
646 struct resource *res;
648 hwmon_device_unregister(data->hwmon_dev);
649 sysfs_remove_group(&pdev->dev.kobj, &smsc47m1_group);
651 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
652 release_region(res->start, SMSC_EXTENT);
653 platform_set_drvdata(pdev, NULL);
659 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
662 struct smsc47m1_data *data = dev_get_drvdata(dev);
664 mutex_lock(&data->update_lock);
666 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
668 fan_nr = data->type == smsc47m2 ? 3 : 2;
670 for (i = 0; i < fan_nr; i++) {
671 data->fan[i] = smsc47m1_read_value(data,
672 SMSC47M1_REG_FAN[i]);
673 data->fan_preload[i] = smsc47m1_read_value(data,
674 SMSC47M1_REG_FAN_PRELOAD[i]);
675 data->pwm[i] = smsc47m1_read_value(data,
676 SMSC47M1_REG_PWM[i]);
679 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
680 data->fan_div[0] = (i >> 4) & 0x03;
681 data->fan_div[1] = i >> 6;
683 data->alarms = smsc47m1_read_value(data,
684 SMSC47M1_REG_ALARM) >> 6;
685 /* Clear alarms if needed */
687 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);
690 data->fan_div[2] = (smsc47m1_read_value(data,
691 SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
692 data->alarms |= (smsc47m1_read_value(data,
693 SMSC47M2_REG_ALARM6) & 0x40) >> 4;
694 /* Clear alarm if needed */
695 if (data->alarms & 0x04)
696 smsc47m1_write_value(data,
701 data->last_updated = jiffies;
704 mutex_unlock(&data->update_lock);
708 static int __init smsc47m1_device_add(unsigned short address,
709 const struct smsc47m1_sio_data *sio_data)
711 struct resource res = {
713 .end = address + SMSC_EXTENT - 1,
715 .flags = IORESOURCE_IO,
719 pdev = platform_device_alloc(DRVNAME, address);
722 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
726 err = platform_device_add_resources(pdev, &res, 1);
728 printk(KERN_ERR DRVNAME ": Device resource addition failed "
730 goto exit_device_put;
733 err = platform_device_add_data(pdev, sio_data,
734 sizeof(struct smsc47m1_sio_data));
736 printk(KERN_ERR DRVNAME ": Platform data allocation failed\n");
737 goto exit_device_put;
740 err = platform_device_add(pdev);
742 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
744 goto exit_device_put;
750 platform_device_put(pdev);
755 static int __init sm_smsc47m1_init(void)
758 unsigned short address;
759 struct smsc47m1_sio_data sio_data;
761 if (smsc47m1_find(&address, &sio_data))
764 err = platform_driver_register(&smsc47m1_driver);
768 /* Sets global pdev as a side effect */
769 err = smsc47m1_device_add(address, &sio_data);
776 platform_driver_unregister(&smsc47m1_driver);
781 static void __exit sm_smsc47m1_exit(void)
783 platform_device_unregister(pdev);
784 platform_driver_unregister(&smsc47m1_driver);
787 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
788 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
789 MODULE_LICENSE("GPL");
791 module_init(sm_smsc47m1_init);
792 module_exit(sm_smsc47m1_exit);