1 /*
2 * smsc47m1.c - Part of lm_sensors, Linux kernel modules
3 * for hardware monitoring
4 *
5 * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
6 * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
7 * Super-I/O chips.
8 *
9 * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
10 * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de>
11 * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
12 * and Jean Delvare
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; either version 2 of the License, or
17 * (at your option) any later version.
18 *
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.
23 *
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.
27 */
28
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/ioport.h>
34 #include <linux/jiffies.h>
35 #include <linux/platform_device.h>
36 #include <linux/hwmon.h>
37 #include <linux/hwmon-sysfs.h>
38 #include <linux/err.h>
39 #include <linux/init.h>
40 #include <linux/mutex.h>
41 #include <linux/sysfs.h>
42 #include <linux/acpi.h>
43 #include <linux/io.h>
44
45 static unsigned short force_id;
46 module_param(force_id, ushort, 0);
47 MODULE_PARM_DESC(force_id, "Override the detected device ID");
48
49 static struct platform_device *pdev;
50
51 #define DRVNAME "smsc47m1"
52 enum chips { smsc47m1, smsc47m2 };
53
54 /* Super-I/0 registers and commands */
55
56 #define REG 0x2e /* The register to read/write */
57 #define VAL 0x2f /* The value to read/write */
58
59 static inline void
superio_outb(int reg,int val)60 superio_outb(int reg, int val)
61 {
62 outb(reg, REG);
63 outb(val, VAL);
64 }
65
66 static inline int
superio_inb(int reg)67 superio_inb(int reg)
68 {
69 outb(reg, REG);
70 return inb(VAL);
71 }
72
73 /* logical device for fans is 0x0A */
74 #define superio_select() superio_outb(0x07, 0x0A)
75
76 static inline void
superio_enter(void)77 superio_enter(void)
78 {
79 outb(0x55, REG);
80 }
81
82 static inline void
superio_exit(void)83 superio_exit(void)
84 {
85 outb(0xAA, REG);
86 }
87
88 #define SUPERIO_REG_ACT 0x30
89 #define SUPERIO_REG_BASE 0x60
90 #define SUPERIO_REG_DEVID 0x20
91 #define SUPERIO_REG_DEVREV 0x21
92
93 /* Logical device registers */
94
95 #define SMSC_EXTENT 0x80
96
97 /* nr is 0 or 1 in the macros below */
98 #define SMSC47M1_REG_ALARM 0x04
99 #define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
100 #define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
101 #define SMSC47M1_REG_FANDIV 0x58
102
103 static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b };
104 static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c };
105 static const u8 SMSC47M1_REG_PWM[3] = { 0x56, 0x57, 0x69 };
106
107 #define SMSC47M2_REG_ALARM6 0x09
108 #define SMSC47M2_REG_TPIN1 0x38
109 #define SMSC47M2_REG_TPIN2 0x37
110 #define SMSC47M2_REG_TPIN3 0x2d
111 #define SMSC47M2_REG_PPIN3 0x2c
112 #define SMSC47M2_REG_FANDIV3 0x6a
113
114 #define MIN_FROM_REG(reg, div) ((reg) >= 192 ? 0 : \
115 983040 / ((192 - (reg)) * (div)))
116 #define FAN_FROM_REG(reg, div, preload) ((reg) <= (preload) || (reg) == 255 ? \
117 0 : \
118 983040 / (((reg) - (preload)) * (div)))
119 #define DIV_FROM_REG(reg) (1 << (reg))
120 #define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
121 #define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
122 #define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
123
124 struct smsc47m1_data {
125 unsigned short addr;
126 const char *name;
127 enum chips type;
128 struct device *hwmon_dev;
129
130 struct mutex update_lock;
131 unsigned long last_updated; /* In jiffies */
132
133 u8 fan[3]; /* Register value */
134 u8 fan_preload[3]; /* Register value */
135 u8 fan_div[3]; /* Register encoding, shifted right */
136 u8 alarms; /* Register encoding */
137 u8 pwm[3]; /* Register value (bit 0 is disable) */
138 };
139
140 struct smsc47m1_sio_data {
141 enum chips type;
142 u8 activate; /* Remember initial device state */
143 };
144
smsc47m1_read_value(struct smsc47m1_data * data,u8 reg)145 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
146 {
147 return inb_p(data->addr + reg);
148 }
149
smsc47m1_write_value(struct smsc47m1_data * data,u8 reg,u8 value)150 static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
151 u8 value)
152 {
153 outb_p(value, data->addr + reg);
154 }
155
smsc47m1_update_device(struct device * dev,int init)156 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
157 int init)
158 {
159 struct smsc47m1_data *data = dev_get_drvdata(dev);
160
161 mutex_lock(&data->update_lock);
162
163 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
164 int i, fan_nr;
165 fan_nr = data->type == smsc47m2 ? 3 : 2;
166
167 for (i = 0; i < fan_nr; i++) {
168 data->fan[i] = smsc47m1_read_value(data,
169 SMSC47M1_REG_FAN[i]);
170 data->fan_preload[i] = smsc47m1_read_value(data,
171 SMSC47M1_REG_FAN_PRELOAD[i]);
172 data->pwm[i] = smsc47m1_read_value(data,
173 SMSC47M1_REG_PWM[i]);
174 }
175
176 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
177 data->fan_div[0] = (i >> 4) & 0x03;
178 data->fan_div[1] = i >> 6;
179
180 data->alarms = smsc47m1_read_value(data,
181 SMSC47M1_REG_ALARM) >> 6;
182 /* Clear alarms if needed */
183 if (data->alarms)
184 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);
185
186 if (fan_nr >= 3) {
187 data->fan_div[2] = (smsc47m1_read_value(data,
188 SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
189 data->alarms |= (smsc47m1_read_value(data,
190 SMSC47M2_REG_ALARM6) & 0x40) >> 4;
191 /* Clear alarm if needed */
192 if (data->alarms & 0x04)
193 smsc47m1_write_value(data,
194 SMSC47M2_REG_ALARM6,
195 0x40);
196 }
197
198 data->last_updated = jiffies;
199 }
200
201 mutex_unlock(&data->update_lock);
202 return data;
203 }
204
get_fan(struct device * dev,struct device_attribute * devattr,char * buf)205 static ssize_t get_fan(struct device *dev, struct device_attribute
206 *devattr, char *buf)
207 {
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
209 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
210 int nr = attr->index;
211 /*
212 * This chip (stupidly) stops monitoring fan speed if PWM is
213 * enabled and duty cycle is 0%. This is fine if the monitoring
214 * and control concern the same fan, but troublesome if they are
215 * not (which could as well happen).
216 */
217 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
218 FAN_FROM_REG(data->fan[nr],
219 DIV_FROM_REG(data->fan_div[nr]),
220 data->fan_preload[nr]);
221 return sprintf(buf, "%d\n", rpm);
222 }
223
get_fan_min(struct device * dev,struct device_attribute * devattr,char * buf)224 static ssize_t get_fan_min(struct device *dev, struct device_attribute
225 *devattr, char *buf)
226 {
227 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
228 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
229 int nr = attr->index;
230 int rpm = MIN_FROM_REG(data->fan_preload[nr],
231 DIV_FROM_REG(data->fan_div[nr]));
232 return sprintf(buf, "%d\n", rpm);
233 }
234
get_fan_div(struct device * dev,struct device_attribute * devattr,char * buf)235 static ssize_t get_fan_div(struct device *dev, struct device_attribute
236 *devattr, char *buf)
237 {
238 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
239 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
240 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
241 }
242
get_fan_alarm(struct device * dev,struct device_attribute * devattr,char * buf)243 static ssize_t get_fan_alarm(struct device *dev, struct device_attribute
244 *devattr, char *buf)
245 {
246 int bitnr = to_sensor_dev_attr(devattr)->index;
247 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
248 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
249 }
250
get_pwm(struct device * dev,struct device_attribute * devattr,char * buf)251 static ssize_t get_pwm(struct device *dev, struct device_attribute
252 *devattr, char *buf)
253 {
254 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
255 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
256 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
257 }
258
get_pwm_en(struct device * dev,struct device_attribute * devattr,char * buf)259 static ssize_t get_pwm_en(struct device *dev, struct device_attribute
260 *devattr, char *buf)
261 {
262 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
263 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
264 return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index]));
265 }
266
alarms_show(struct device * dev,struct device_attribute * devattr,char * buf)267 static ssize_t alarms_show(struct device *dev,
268 struct device_attribute *devattr, char *buf)
269 {
270 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
271 return sprintf(buf, "%d\n", data->alarms);
272 }
273
set_fan_min(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)274 static ssize_t set_fan_min(struct device *dev, struct device_attribute
275 *devattr, const char *buf, size_t count)
276 {
277 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
278 struct smsc47m1_data *data = dev_get_drvdata(dev);
279 int nr = attr->index;
280 long rpmdiv;
281 long val;
282 int err;
283
284 err = kstrtol(buf, 10, &val);
285 if (err)
286 return err;
287
288 mutex_lock(&data->update_lock);
289 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
290
291 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
292 mutex_unlock(&data->update_lock);
293 return -EINVAL;
294 }
295
296 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
297 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
298 data->fan_preload[nr]);
299 mutex_unlock(&data->update_lock);
300
301 return count;
302 }
303
304 /*
305 * Note: we save and restore the fan minimum here, because its value is
306 * determined in part by the fan clock divider. This follows the principle
307 * of least surprise; the user doesn't expect the fan minimum to change just
308 * because the divider changed.
309 */
set_fan_div(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)310 static ssize_t set_fan_div(struct device *dev, struct device_attribute
311 *devattr, const char *buf, size_t count)
312 {
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 new_div;
317 int err;
318 long tmp;
319 u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
320
321 err = kstrtol(buf, 10, &new_div);
322 if (err)
323 return err;
324
325 if (new_div == old_div) /* No change */
326 return count;
327
328 mutex_lock(&data->update_lock);
329 switch (new_div) {
330 case 1:
331 data->fan_div[nr] = 0;
332 break;
333 case 2:
334 data->fan_div[nr] = 1;
335 break;
336 case 4:
337 data->fan_div[nr] = 2;
338 break;
339 case 8:
340 data->fan_div[nr] = 3;
341 break;
342 default:
343 mutex_unlock(&data->update_lock);
344 return -EINVAL;
345 }
346
347 switch (nr) {
348 case 0:
349 case 1:
350 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
351 & ~(0x03 << (4 + 2 * nr));
352 tmp |= data->fan_div[nr] << (4 + 2 * nr);
353 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
354 break;
355 case 2:
356 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
357 tmp |= data->fan_div[2] << 4;
358 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
359 break;
360 }
361
362 /* Preserve fan min */
363 tmp = 192 - (old_div * (192 - data->fan_preload[nr])
364 + new_div / 2) / new_div;
365 data->fan_preload[nr] = clamp_val(tmp, 0, 191);
366 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
367 data->fan_preload[nr]);
368 mutex_unlock(&data->update_lock);
369
370 return count;
371 }
372
set_pwm(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)373 static ssize_t set_pwm(struct device *dev, struct device_attribute
374 *devattr, const char *buf, size_t count)
375 {
376 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
377 struct smsc47m1_data *data = dev_get_drvdata(dev);
378 int nr = attr->index;
379 long val;
380 int err;
381
382 err = kstrtol(buf, 10, &val);
383 if (err)
384 return err;
385
386 if (val < 0 || val > 255)
387 return -EINVAL;
388
389 mutex_lock(&data->update_lock);
390 data->pwm[nr] &= 0x81; /* Preserve additional bits */
391 data->pwm[nr] |= PWM_TO_REG(val);
392 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
393 data->pwm[nr]);
394 mutex_unlock(&data->update_lock);
395
396 return count;
397 }
398
set_pwm_en(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)399 static ssize_t set_pwm_en(struct device *dev, struct device_attribute
400 *devattr, const char *buf, size_t count)
401 {
402 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
403 struct smsc47m1_data *data = dev_get_drvdata(dev);
404 int nr = attr->index;
405 unsigned long val;
406 int err;
407
408 err = kstrtoul(buf, 10, &val);
409 if (err)
410 return err;
411
412 if (val > 1)
413 return -EINVAL;
414
415 mutex_lock(&data->update_lock);
416 data->pwm[nr] &= 0xFE; /* preserve the other bits */
417 data->pwm[nr] |= !val;
418 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
419 data->pwm[nr]);
420 mutex_unlock(&data->update_lock);
421
422 return count;
423 }
424
425 #define fan_present(offset) \
426 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan, \
427 NULL, offset - 1); \
428 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
429 get_fan_min, set_fan_min, offset - 1); \
430 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
431 get_fan_div, set_fan_div, offset - 1); \
432 static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm, \
433 NULL, offset - 1); \
434 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
435 get_pwm, set_pwm, offset - 1); \
436 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
437 get_pwm_en, set_pwm_en, offset - 1)
438
439 fan_present(1);
440 fan_present(2);
441 fan_present(3);
442
443 static DEVICE_ATTR_RO(alarms);
444
name_show(struct device * dev,struct device_attribute * devattr,char * buf)445 static ssize_t name_show(struct device *dev, struct device_attribute
446 *devattr, char *buf)
447 {
448 struct smsc47m1_data *data = dev_get_drvdata(dev);
449
450 return sprintf(buf, "%s\n", data->name);
451 }
452 static DEVICE_ATTR_RO(name);
453
454 static struct attribute *smsc47m1_attributes_fan1[] = {
455 &sensor_dev_attr_fan1_input.dev_attr.attr,
456 &sensor_dev_attr_fan1_min.dev_attr.attr,
457 &sensor_dev_attr_fan1_div.dev_attr.attr,
458 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
459 NULL
460 };
461
462 static const struct attribute_group smsc47m1_group_fan1 = {
463 .attrs = smsc47m1_attributes_fan1,
464 };
465
466 static struct attribute *smsc47m1_attributes_fan2[] = {
467 &sensor_dev_attr_fan2_input.dev_attr.attr,
468 &sensor_dev_attr_fan2_min.dev_attr.attr,
469 &sensor_dev_attr_fan2_div.dev_attr.attr,
470 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
471 NULL
472 };
473
474 static const struct attribute_group smsc47m1_group_fan2 = {
475 .attrs = smsc47m1_attributes_fan2,
476 };
477
478 static struct attribute *smsc47m1_attributes_fan3[] = {
479 &sensor_dev_attr_fan3_input.dev_attr.attr,
480 &sensor_dev_attr_fan3_min.dev_attr.attr,
481 &sensor_dev_attr_fan3_div.dev_attr.attr,
482 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
483 NULL
484 };
485
486 static const struct attribute_group smsc47m1_group_fan3 = {
487 .attrs = smsc47m1_attributes_fan3,
488 };
489
490 static struct attribute *smsc47m1_attributes_pwm1[] = {
491 &sensor_dev_attr_pwm1.dev_attr.attr,
492 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
493 NULL
494 };
495
496 static const struct attribute_group smsc47m1_group_pwm1 = {
497 .attrs = smsc47m1_attributes_pwm1,
498 };
499
500 static struct attribute *smsc47m1_attributes_pwm2[] = {
501 &sensor_dev_attr_pwm2.dev_attr.attr,
502 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
503 NULL
504 };
505
506 static const struct attribute_group smsc47m1_group_pwm2 = {
507 .attrs = smsc47m1_attributes_pwm2,
508 };
509
510 static struct attribute *smsc47m1_attributes_pwm3[] = {
511 &sensor_dev_attr_pwm3.dev_attr.attr,
512 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
513 NULL
514 };
515
516 static const struct attribute_group smsc47m1_group_pwm3 = {
517 .attrs = smsc47m1_attributes_pwm3,
518 };
519
520 static struct attribute *smsc47m1_attributes[] = {
521 &dev_attr_alarms.attr,
522 &dev_attr_name.attr,
523 NULL
524 };
525
526 static const struct attribute_group smsc47m1_group = {
527 .attrs = smsc47m1_attributes,
528 };
529
smsc47m1_find(struct smsc47m1_sio_data * sio_data)530 static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
531 {
532 u8 val;
533 unsigned short addr;
534
535 superio_enter();
536 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
537
538 /*
539 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
540 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
541 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
542 * can do much more besides (device id 0x60).
543 * The LPC47M997 is undocumented, but seems to be compatible with
544 * the LPC47M192, and has the same device id.
545 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
546 * supports a 3rd fan, and the pin configuration registers are
547 * unfortunately different.
548 * The LPC47M233 has the same device id (0x6B) but is not compatible.
549 * We check the high bit of the device revision register to
550 * differentiate them.
551 */
552 switch (val) {
553 case 0x51:
554 pr_info("Found SMSC LPC47B27x\n");
555 sio_data->type = smsc47m1;
556 break;
557 case 0x59:
558 pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
559 sio_data->type = smsc47m1;
560 break;
561 case 0x5F:
562 pr_info("Found SMSC LPC47M14x\n");
563 sio_data->type = smsc47m1;
564 break;
565 case 0x60:
566 pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
567 sio_data->type = smsc47m1;
568 break;
569 case 0x6B:
570 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
571 pr_debug("Found SMSC LPC47M233, unsupported\n");
572 superio_exit();
573 return -ENODEV;
574 }
575
576 pr_info("Found SMSC LPC47M292\n");
577 sio_data->type = smsc47m2;
578 break;
579 default:
580 superio_exit();
581 return -ENODEV;
582 }
583
584 superio_select();
585 addr = (superio_inb(SUPERIO_REG_BASE) << 8)
586 | superio_inb(SUPERIO_REG_BASE + 1);
587 if (addr == 0) {
588 pr_info("Device address not set, will not use\n");
589 superio_exit();
590 return -ENODEV;
591 }
592
593 /*
594 * Enable only if address is set (needed at least on the
595 * Compaq Presario S4000NX)
596 */
597 sio_data->activate = superio_inb(SUPERIO_REG_ACT);
598 if ((sio_data->activate & 0x01) == 0) {
599 pr_info("Enabling device\n");
600 superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
601 }
602
603 superio_exit();
604 return addr;
605 }
606
607 /* Restore device to its initial state */
smsc47m1_restore(const struct smsc47m1_sio_data * sio_data)608 static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
609 {
610 if ((sio_data->activate & 0x01) == 0) {
611 superio_enter();
612 superio_select();
613
614 pr_info("Disabling device\n");
615 superio_outb(SUPERIO_REG_ACT, sio_data->activate);
616
617 superio_exit();
618 }
619 }
620
621 #define CHECK 1
622 #define REQUEST 2
623
624 /*
625 * This function can be used to:
626 * - test for resource conflicts with ACPI
627 * - request the resources
628 * We only allocate the I/O ports we really need, to minimize the risk of
629 * conflicts with ACPI or with other drivers.
630 */
smsc47m1_handle_resources(unsigned short address,enum chips type,int action,struct device * dev)631 static int __init smsc47m1_handle_resources(unsigned short address,
632 enum chips type, int action,
633 struct device *dev)
634 {
635 static const u8 ports_m1[] = {
636 /* register, region length */
637 0x04, 1,
638 0x33, 4,
639 0x56, 7,
640 };
641
642 static const u8 ports_m2[] = {
643 /* register, region length */
644 0x04, 1,
645 0x09, 1,
646 0x2c, 2,
647 0x35, 4,
648 0x56, 7,
649 0x69, 4,
650 };
651
652 int i, ports_size, err;
653 const u8 *ports;
654
655 switch (type) {
656 case smsc47m1:
657 default:
658 ports = ports_m1;
659 ports_size = ARRAY_SIZE(ports_m1);
660 break;
661 case smsc47m2:
662 ports = ports_m2;
663 ports_size = ARRAY_SIZE(ports_m2);
664 break;
665 }
666
667 for (i = 0; i + 1 < ports_size; i += 2) {
668 unsigned short start = address + ports[i];
669 unsigned short len = ports[i + 1];
670
671 switch (action) {
672 case CHECK:
673 /* Only check for conflicts */
674 err = acpi_check_region(start, len, DRVNAME);
675 if (err)
676 return err;
677 break;
678 case REQUEST:
679 /* Request the resources */
680 if (!devm_request_region(dev, start, len, DRVNAME)) {
681 dev_err(dev,
682 "Region 0x%hx-0x%hx already in use!\n",
683 start, start + len);
684 return -EBUSY;
685 }
686 break;
687 }
688 }
689
690 return 0;
691 }
692
smsc47m1_remove_files(struct device * dev)693 static void smsc47m1_remove_files(struct device *dev)
694 {
695 sysfs_remove_group(&dev->kobj, &smsc47m1_group);
696 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1);
697 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2);
698 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3);
699 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1);
700 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2);
701 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3);
702 }
703
smsc47m1_probe(struct platform_device * pdev)704 static int __init smsc47m1_probe(struct platform_device *pdev)
705 {
706 struct device *dev = &pdev->dev;
707 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev);
708 struct smsc47m1_data *data;
709 struct resource *res;
710 int err;
711 int fan1, fan2, fan3, pwm1, pwm2, pwm3;
712
713 static const char * const names[] = {
714 "smsc47m1",
715 "smsc47m2",
716 };
717
718 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
719 err = smsc47m1_handle_resources(res->start, sio_data->type,
720 REQUEST, dev);
721 if (err < 0)
722 return err;
723
724 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL);
725 if (!data)
726 return -ENOMEM;
727
728 data->addr = res->start;
729 data->type = sio_data->type;
730 data->name = names[sio_data->type];
731 mutex_init(&data->update_lock);
732 platform_set_drvdata(pdev, data);
733
734 /*
735 * If no function is properly configured, there's no point in
736 * actually registering the chip.
737 */
738 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
739 == 0x04;
740 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
741 == 0x04;
742 if (data->type == smsc47m2) {
743 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
744 & 0x0d) == 0x09;
745 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
746 & 0x0d) == 0x09;
747 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
748 & 0x0d) == 0x0d;
749 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
750 & 0x0d) == 0x08;
751 } else {
752 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
753 & 0x05) == 0x05;
754 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
755 & 0x05) == 0x05;
756 fan3 = 0;
757 pwm3 = 0;
758 }
759 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
760 dev_warn(dev, "Device not configured, will not use\n");
761 return -ENODEV;
762 }
763
764 /*
765 * Some values (fan min, clock dividers, pwm registers) may be
766 * needed before any update is triggered, so we better read them
767 * at least once here. We don't usually do it that way, but in
768 * this particular case, manually reading 5 registers out of 8
769 * doesn't make much sense and we're better using the existing
770 * function.
771 */
772 smsc47m1_update_device(dev, 1);
773
774 /* Register sysfs hooks */
775 if (fan1) {
776 err = sysfs_create_group(&dev->kobj,
777 &smsc47m1_group_fan1);
778 if (err)
779 goto error_remove_files;
780 } else
781 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");
782
783 if (fan2) {
784 err = sysfs_create_group(&dev->kobj,
785 &smsc47m1_group_fan2);
786 if (err)
787 goto error_remove_files;
788 } else
789 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");
790
791 if (fan3) {
792 err = sysfs_create_group(&dev->kobj,
793 &smsc47m1_group_fan3);
794 if (err)
795 goto error_remove_files;
796 } else if (data->type == smsc47m2)
797 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");
798
799 if (pwm1) {
800 err = sysfs_create_group(&dev->kobj,
801 &smsc47m1_group_pwm1);
802 if (err)
803 goto error_remove_files;
804 } else
805 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");
806
807 if (pwm2) {
808 err = sysfs_create_group(&dev->kobj,
809 &smsc47m1_group_pwm2);
810 if (err)
811 goto error_remove_files;
812 } else
813 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");
814
815 if (pwm3) {
816 err = sysfs_create_group(&dev->kobj,
817 &smsc47m1_group_pwm3);
818 if (err)
819 goto error_remove_files;
820 } else if (data->type == smsc47m2)
821 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");
822
823 err = sysfs_create_group(&dev->kobj, &smsc47m1_group);
824 if (err)
825 goto error_remove_files;
826
827 data->hwmon_dev = hwmon_device_register(dev);
828 if (IS_ERR(data->hwmon_dev)) {
829 err = PTR_ERR(data->hwmon_dev);
830 goto error_remove_files;
831 }
832
833 return 0;
834
835 error_remove_files:
836 smsc47m1_remove_files(dev);
837 return err;
838 }
839
smsc47m1_remove(struct platform_device * pdev)840 static int __exit smsc47m1_remove(struct platform_device *pdev)
841 {
842 struct smsc47m1_data *data = platform_get_drvdata(pdev);
843
844 hwmon_device_unregister(data->hwmon_dev);
845 smsc47m1_remove_files(&pdev->dev);
846
847 return 0;
848 }
849
850 static struct platform_driver smsc47m1_driver = {
851 .driver = {
852 .name = DRVNAME,
853 },
854 .remove = __exit_p(smsc47m1_remove),
855 };
856
smsc47m1_device_add(unsigned short address,const struct smsc47m1_sio_data * sio_data)857 static int __init smsc47m1_device_add(unsigned short address,
858 const struct smsc47m1_sio_data *sio_data)
859 {
860 struct resource res = {
861 .start = address,
862 .end = address + SMSC_EXTENT - 1,
863 .name = DRVNAME,
864 .flags = IORESOURCE_IO,
865 };
866 int err;
867
868 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
869 if (err)
870 goto exit;
871
872 pdev = platform_device_alloc(DRVNAME, address);
873 if (!pdev) {
874 err = -ENOMEM;
875 pr_err("Device allocation failed\n");
876 goto exit;
877 }
878
879 err = platform_device_add_resources(pdev, &res, 1);
880 if (err) {
881 pr_err("Device resource addition failed (%d)\n", err);
882 goto exit_device_put;
883 }
884
885 err = platform_device_add_data(pdev, sio_data,
886 sizeof(struct smsc47m1_sio_data));
887 if (err) {
888 pr_err("Platform data allocation failed\n");
889 goto exit_device_put;
890 }
891
892 err = platform_device_add(pdev);
893 if (err) {
894 pr_err("Device addition failed (%d)\n", err);
895 goto exit_device_put;
896 }
897
898 return 0;
899
900 exit_device_put:
901 platform_device_put(pdev);
902 exit:
903 return err;
904 }
905
sm_smsc47m1_init(void)906 static int __init sm_smsc47m1_init(void)
907 {
908 int err;
909 unsigned short address;
910 struct smsc47m1_sio_data sio_data;
911
912 err = smsc47m1_find(&sio_data);
913 if (err < 0)
914 return err;
915 address = err;
916
917 /* Sets global pdev as a side effect */
918 err = smsc47m1_device_add(address, &sio_data);
919 if (err)
920 return err;
921
922 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
923 if (err)
924 goto exit_device;
925
926 return 0;
927
928 exit_device:
929 platform_device_unregister(pdev);
930 smsc47m1_restore(&sio_data);
931 return err;
932 }
933
sm_smsc47m1_exit(void)934 static void __exit sm_smsc47m1_exit(void)
935 {
936 platform_driver_unregister(&smsc47m1_driver);
937 smsc47m1_restore(dev_get_platdata(&pdev->dev));
938 platform_device_unregister(pdev);
939 }
940
941 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
942 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
943 MODULE_LICENSE("GPL");
944
945 module_init(sm_smsc47m1_init);
946 module_exit(sm_smsc47m1_exit);
947
