1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * smsc47m1.c - Part of lm_sensors, Linux kernel modules
4 * for hardware monitoring
5 *
6 * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
7 * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
8 * Super-I/O chips.
9 *
10 * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
11 * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de>
12 * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
13 * and Jean Delvare
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/ioport.h>
21 #include <linux/jiffies.h>
22 #include <linux/platform_device.h>
23 #include <linux/hwmon.h>
24 #include <linux/hwmon-sysfs.h>
25 #include <linux/err.h>
26 #include <linux/init.h>
27 #include <linux/mutex.h>
28 #include <linux/sysfs.h>
29 #include <linux/acpi.h>
30 #include <linux/io.h>
31
32 static unsigned short force_id;
33 module_param(force_id, ushort, 0);
34 MODULE_PARM_DESC(force_id, "Override the detected device ID");
35
36 static struct platform_device *pdev;
37
38 #define DRVNAME "smsc47m1"
39 enum chips { smsc47m1, smsc47m2 };
40
41 /* Super-I/0 registers and commands */
42
43 #define REG 0x2e /* The register to read/write */
44 #define VAL 0x2f /* The value to read/write */
45
46 static inline void
superio_outb(int reg,int val)47 superio_outb(int reg, int val)
48 {
49 outb(reg, REG);
50 outb(val, VAL);
51 }
52
53 static inline int
superio_inb(int reg)54 superio_inb(int reg)
55 {
56 outb(reg, REG);
57 return inb(VAL);
58 }
59
60 /* logical device for fans is 0x0A */
61 #define superio_select() superio_outb(0x07, 0x0A)
62
63 static inline int
superio_enter(void)64 superio_enter(void)
65 {
66 if (!request_muxed_region(REG, 2, DRVNAME))
67 return -EBUSY;
68
69 outb(0x55, REG);
70 return 0;
71 }
72
73 static inline void
superio_exit(void)74 superio_exit(void)
75 {
76 outb(0xAA, REG);
77 release_region(REG, 2);
78 }
79
80 #define SUPERIO_REG_ACT 0x30
81 #define SUPERIO_REG_BASE 0x60
82 #define SUPERIO_REG_DEVID 0x20
83 #define SUPERIO_REG_DEVREV 0x21
84
85 /* Logical device registers */
86
87 #define SMSC_EXTENT 0x80
88
89 /* nr is 0 or 1 in the macros below */
90 #define SMSC47M1_REG_ALARM 0x04
91 #define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
92 #define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
93 #define SMSC47M1_REG_FANDIV 0x58
94
95 static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b };
96 static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c };
97 static const u8 SMSC47M1_REG_PWM[3] = { 0x56, 0x57, 0x69 };
98
99 #define SMSC47M2_REG_ALARM6 0x09
100 #define SMSC47M2_REG_TPIN1 0x38
101 #define SMSC47M2_REG_TPIN2 0x37
102 #define SMSC47M2_REG_TPIN3 0x2d
103 #define SMSC47M2_REG_PPIN3 0x2c
104 #define SMSC47M2_REG_FANDIV3 0x6a
105
106 #define MIN_FROM_REG(reg, div) ((reg) >= 192 ? 0 : \
107 983040 / ((192 - (reg)) * (div)))
108 #define FAN_FROM_REG(reg, div, preload) ((reg) <= (preload) || (reg) == 255 ? \
109 0 : \
110 983040 / (((reg) - (preload)) * (div)))
111 #define DIV_FROM_REG(reg) (1 << (reg))
112 #define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
113 #define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
114 #define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
115
116 struct smsc47m1_data {
117 unsigned short addr;
118 const char *name;
119 enum chips type;
120 struct device *hwmon_dev;
121
122 struct mutex update_lock;
123 unsigned long last_updated; /* In jiffies */
124
125 u8 fan[3]; /* Register value */
126 u8 fan_preload[3]; /* Register value */
127 u8 fan_div[3]; /* Register encoding, shifted right */
128 u8 alarms; /* Register encoding */
129 u8 pwm[3]; /* Register value (bit 0 is disable) */
130 };
131
132 struct smsc47m1_sio_data {
133 enum chips type;
134 u8 activate; /* Remember initial device state */
135 };
136
smsc47m1_read_value(struct smsc47m1_data * data,u8 reg)137 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
138 {
139 return inb_p(data->addr + reg);
140 }
141
smsc47m1_write_value(struct smsc47m1_data * data,u8 reg,u8 value)142 static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
143 u8 value)
144 {
145 outb_p(value, data->addr + reg);
146 }
147
smsc47m1_update_device(struct device * dev,int init)148 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
149 int init)
150 {
151 struct smsc47m1_data *data = dev_get_drvdata(dev);
152
153 mutex_lock(&data->update_lock);
154
155 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
156 int i, fan_nr;
157 fan_nr = data->type == smsc47m2 ? 3 : 2;
158
159 for (i = 0; i < fan_nr; i++) {
160 data->fan[i] = smsc47m1_read_value(data,
161 SMSC47M1_REG_FAN[i]);
162 data->fan_preload[i] = smsc47m1_read_value(data,
163 SMSC47M1_REG_FAN_PRELOAD[i]);
164 data->pwm[i] = smsc47m1_read_value(data,
165 SMSC47M1_REG_PWM[i]);
166 }
167
168 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
169 data->fan_div[0] = (i >> 4) & 0x03;
170 data->fan_div[1] = i >> 6;
171
172 data->alarms = smsc47m1_read_value(data,
173 SMSC47M1_REG_ALARM) >> 6;
174 /* Clear alarms if needed */
175 if (data->alarms)
176 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);
177
178 if (fan_nr >= 3) {
179 data->fan_div[2] = (smsc47m1_read_value(data,
180 SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
181 data->alarms |= (smsc47m1_read_value(data,
182 SMSC47M2_REG_ALARM6) & 0x40) >> 4;
183 /* Clear alarm if needed */
184 if (data->alarms & 0x04)
185 smsc47m1_write_value(data,
186 SMSC47M2_REG_ALARM6,
187 0x40);
188 }
189
190 data->last_updated = jiffies;
191 }
192
193 mutex_unlock(&data->update_lock);
194 return data;
195 }
196
fan_show(struct device * dev,struct device_attribute * devattr,char * buf)197 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
198 char *buf)
199 {
200 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
201 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
202 int nr = attr->index;
203 /*
204 * This chip (stupidly) stops monitoring fan speed if PWM is
205 * enabled and duty cycle is 0%. This is fine if the monitoring
206 * and control concern the same fan, but troublesome if they are
207 * not (which could as well happen).
208 */
209 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
210 FAN_FROM_REG(data->fan[nr],
211 DIV_FROM_REG(data->fan_div[nr]),
212 data->fan_preload[nr]);
213 return sprintf(buf, "%d\n", rpm);
214 }
215
fan_min_show(struct device * dev,struct device_attribute * devattr,char * buf)216 static ssize_t fan_min_show(struct device *dev,
217 struct device_attribute *devattr, char *buf)
218 {
219 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
220 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
221 int nr = attr->index;
222 int rpm = MIN_FROM_REG(data->fan_preload[nr],
223 DIV_FROM_REG(data->fan_div[nr]));
224 return sprintf(buf, "%d\n", rpm);
225 }
226
fan_div_show(struct device * dev,struct device_attribute * devattr,char * buf)227 static ssize_t fan_div_show(struct device *dev,
228 struct device_attribute *devattr, char *buf)
229 {
230 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
231 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
232 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
233 }
234
fan_alarm_show(struct device * dev,struct device_attribute * devattr,char * buf)235 static ssize_t fan_alarm_show(struct device *dev,
236 struct device_attribute *devattr, char *buf)
237 {
238 int bitnr = to_sensor_dev_attr(devattr)->index;
239 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
240 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
241 }
242
pwm_show(struct device * dev,struct device_attribute * devattr,char * buf)243 static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
244 char *buf)
245 {
246 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
247 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
248 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
249 }
250
pwm_en_show(struct device * dev,struct device_attribute * devattr,char * buf)251 static ssize_t pwm_en_show(struct device *dev,
252 struct device_attribute *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_EN_FROM_REG(data->pwm[attr->index]));
257 }
258
alarms_show(struct device * dev,struct device_attribute * devattr,char * buf)259 static ssize_t alarms_show(struct device *dev,
260 struct device_attribute *devattr, char *buf)
261 {
262 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
263 return sprintf(buf, "%d\n", data->alarms);
264 }
265
fan_min_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)266 static ssize_t fan_min_store(struct device *dev,
267 struct device_attribute *devattr,
268 const char *buf, size_t count)
269 {
270 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
271 struct smsc47m1_data *data = dev_get_drvdata(dev);
272 int nr = attr->index;
273 long rpmdiv;
274 long val;
275 int err;
276
277 err = kstrtol(buf, 10, &val);
278 if (err)
279 return err;
280
281 mutex_lock(&data->update_lock);
282 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
283
284 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
285 mutex_unlock(&data->update_lock);
286 return -EINVAL;
287 }
288
289 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
290 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
291 data->fan_preload[nr]);
292 mutex_unlock(&data->update_lock);
293
294 return count;
295 }
296
297 /*
298 * Note: we save and restore the fan minimum here, because its value is
299 * determined in part by the fan clock divider. This follows the principle
300 * of least surprise; the user doesn't expect the fan minimum to change just
301 * because the divider changed.
302 */
fan_div_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)303 static ssize_t fan_div_store(struct device *dev,
304 struct device_attribute *devattr,
305 const char *buf, size_t count)
306 {
307 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
308 struct smsc47m1_data *data = dev_get_drvdata(dev);
309 int nr = attr->index;
310 long new_div;
311 int err;
312 long tmp;
313 u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
314
315 err = kstrtol(buf, 10, &new_div);
316 if (err)
317 return err;
318
319 if (new_div == old_div) /* No change */
320 return count;
321
322 mutex_lock(&data->update_lock);
323 switch (new_div) {
324 case 1:
325 data->fan_div[nr] = 0;
326 break;
327 case 2:
328 data->fan_div[nr] = 1;
329 break;
330 case 4:
331 data->fan_div[nr] = 2;
332 break;
333 case 8:
334 data->fan_div[nr] = 3;
335 break;
336 default:
337 mutex_unlock(&data->update_lock);
338 return -EINVAL;
339 }
340
341 switch (nr) {
342 case 0:
343 case 1:
344 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
345 & ~(0x03 << (4 + 2 * nr));
346 tmp |= data->fan_div[nr] << (4 + 2 * nr);
347 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
348 break;
349 case 2:
350 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
351 tmp |= data->fan_div[2] << 4;
352 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
353 break;
354 default:
355 BUG();
356 }
357
358 /* Preserve fan min */
359 tmp = 192 - (old_div * (192 - data->fan_preload[nr])
360 + new_div / 2) / new_div;
361 data->fan_preload[nr] = clamp_val(tmp, 0, 191);
362 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
363 data->fan_preload[nr]);
364 mutex_unlock(&data->update_lock);
365
366 return count;
367 }
368
pwm_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)369 static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
370 const char *buf, size_t count)
371 {
372 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
373 struct smsc47m1_data *data = dev_get_drvdata(dev);
374 int nr = attr->index;
375 long val;
376 int err;
377
378 err = kstrtol(buf, 10, &val);
379 if (err)
380 return err;
381
382 if (val < 0 || val > 255)
383 return -EINVAL;
384
385 mutex_lock(&data->update_lock);
386 data->pwm[nr] &= 0x81; /* Preserve additional bits */
387 data->pwm[nr] |= PWM_TO_REG(val);
388 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
389 data->pwm[nr]);
390 mutex_unlock(&data->update_lock);
391
392 return count;
393 }
394
pwm_en_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)395 static ssize_t pwm_en_store(struct device *dev,
396 struct device_attribute *devattr, const char *buf,
397 size_t count)
398 {
399 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
400 struct smsc47m1_data *data = dev_get_drvdata(dev);
401 int nr = attr->index;
402 unsigned long val;
403 int err;
404
405 err = kstrtoul(buf, 10, &val);
406 if (err)
407 return err;
408
409 if (val > 1)
410 return -EINVAL;
411
412 mutex_lock(&data->update_lock);
413 data->pwm[nr] &= 0xFE; /* preserve the other bits */
414 data->pwm[nr] |= !val;
415 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
416 data->pwm[nr]);
417 mutex_unlock(&data->update_lock);
418
419 return count;
420 }
421
422 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
423 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
424 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
425 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0);
426 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
427 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_en, 0);
428 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
429 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
430 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
431 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1);
432 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
433 static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_en, 1);
434 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
435 static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
436 static SENSOR_DEVICE_ATTR_RW(fan3_div, fan_div, 2);
437 static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2);
438 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
439 static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_en, 2);
440
441 static DEVICE_ATTR_RO(alarms);
442
name_show(struct device * dev,struct device_attribute * devattr,char * buf)443 static ssize_t name_show(struct device *dev, struct device_attribute
444 *devattr, char *buf)
445 {
446 struct smsc47m1_data *data = dev_get_drvdata(dev);
447
448 return sprintf(buf, "%s\n", data->name);
449 }
450 static DEVICE_ATTR_RO(name);
451
452 static struct attribute *smsc47m1_attributes_fan1[] = {
453 &sensor_dev_attr_fan1_input.dev_attr.attr,
454 &sensor_dev_attr_fan1_min.dev_attr.attr,
455 &sensor_dev_attr_fan1_div.dev_attr.attr,
456 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
457 NULL
458 };
459
460 static const struct attribute_group smsc47m1_group_fan1 = {
461 .attrs = smsc47m1_attributes_fan1,
462 };
463
464 static struct attribute *smsc47m1_attributes_fan2[] = {
465 &sensor_dev_attr_fan2_input.dev_attr.attr,
466 &sensor_dev_attr_fan2_min.dev_attr.attr,
467 &sensor_dev_attr_fan2_div.dev_attr.attr,
468 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
469 NULL
470 };
471
472 static const struct attribute_group smsc47m1_group_fan2 = {
473 .attrs = smsc47m1_attributes_fan2,
474 };
475
476 static struct attribute *smsc47m1_attributes_fan3[] = {
477 &sensor_dev_attr_fan3_input.dev_attr.attr,
478 &sensor_dev_attr_fan3_min.dev_attr.attr,
479 &sensor_dev_attr_fan3_div.dev_attr.attr,
480 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
481 NULL
482 };
483
484 static const struct attribute_group smsc47m1_group_fan3 = {
485 .attrs = smsc47m1_attributes_fan3,
486 };
487
488 static struct attribute *smsc47m1_attributes_pwm1[] = {
489 &sensor_dev_attr_pwm1.dev_attr.attr,
490 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
491 NULL
492 };
493
494 static const struct attribute_group smsc47m1_group_pwm1 = {
495 .attrs = smsc47m1_attributes_pwm1,
496 };
497
498 static struct attribute *smsc47m1_attributes_pwm2[] = {
499 &sensor_dev_attr_pwm2.dev_attr.attr,
500 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
501 NULL
502 };
503
504 static const struct attribute_group smsc47m1_group_pwm2 = {
505 .attrs = smsc47m1_attributes_pwm2,
506 };
507
508 static struct attribute *smsc47m1_attributes_pwm3[] = {
509 &sensor_dev_attr_pwm3.dev_attr.attr,
510 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
511 NULL
512 };
513
514 static const struct attribute_group smsc47m1_group_pwm3 = {
515 .attrs = smsc47m1_attributes_pwm3,
516 };
517
518 static struct attribute *smsc47m1_attributes[] = {
519 &dev_attr_alarms.attr,
520 &dev_attr_name.attr,
521 NULL
522 };
523
524 static const struct attribute_group smsc47m1_group = {
525 .attrs = smsc47m1_attributes,
526 };
527
smsc47m1_find(struct smsc47m1_sio_data * sio_data)528 static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
529 {
530 u8 val;
531 unsigned short addr;
532 int err;
533
534 err = superio_enter();
535 if (err)
536 return err;
537
538 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
539
540 /*
541 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
542 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
543 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
544 * can do much more besides (device id 0x60).
545 * The LPC47M997 is undocumented, but seems to be compatible with
546 * the LPC47M192, and has the same device id.
547 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
548 * supports a 3rd fan, and the pin configuration registers are
549 * unfortunately different.
550 * The LPC47M233 has the same device id (0x6B) but is not compatible.
551 * We check the high bit of the device revision register to
552 * differentiate them.
553 */
554 switch (val) {
555 case 0x51:
556 pr_info("Found SMSC LPC47B27x\n");
557 sio_data->type = smsc47m1;
558 break;
559 case 0x59:
560 pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
561 sio_data->type = smsc47m1;
562 break;
563 case 0x5F:
564 pr_info("Found SMSC LPC47M14x\n");
565 sio_data->type = smsc47m1;
566 break;
567 case 0x60:
568 pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
569 sio_data->type = smsc47m1;
570 break;
571 case 0x6B:
572 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
573 pr_debug("Found SMSC LPC47M233, unsupported\n");
574 superio_exit();
575 return -ENODEV;
576 }
577
578 pr_info("Found SMSC LPC47M292\n");
579 sio_data->type = smsc47m2;
580 break;
581 default:
582 superio_exit();
583 return -ENODEV;
584 }
585
586 superio_select();
587 addr = (superio_inb(SUPERIO_REG_BASE) << 8)
588 | superio_inb(SUPERIO_REG_BASE + 1);
589 if (addr == 0) {
590 pr_info("Device address not set, will not use\n");
591 superio_exit();
592 return -ENODEV;
593 }
594
595 /*
596 * Enable only if address is set (needed at least on the
597 * Compaq Presario S4000NX)
598 */
599 sio_data->activate = superio_inb(SUPERIO_REG_ACT);
600 if ((sio_data->activate & 0x01) == 0) {
601 pr_info("Enabling device\n");
602 superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
603 }
604
605 superio_exit();
606 return addr;
607 }
608
609 /* Restore device to its initial state */
smsc47m1_restore(const struct smsc47m1_sio_data * sio_data)610 static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
611 {
612 if ((sio_data->activate & 0x01) == 0) {
613 if (!superio_enter()) {
614 superio_select();
615 pr_info("Disabling device\n");
616 superio_outb(SUPERIO_REG_ACT, sio_data->activate);
617 superio_exit();
618 } else {
619 pr_warn("Failed to disable device\n");
620 }
621 }
622 }
623
624 #define CHECK 1
625 #define REQUEST 2
626
627 /*
628 * This function can be used to:
629 * - test for resource conflicts with ACPI
630 * - request the resources
631 * We only allocate the I/O ports we really need, to minimize the risk of
632 * conflicts with ACPI or with other drivers.
633 */
smsc47m1_handle_resources(unsigned short address,enum chips type,int action,struct device * dev)634 static int __init smsc47m1_handle_resources(unsigned short address,
635 enum chips type, int action,
636 struct device *dev)
637 {
638 static const u8 ports_m1[] = {
639 /* register, region length */
640 0x04, 1,
641 0x33, 4,
642 0x56, 7,
643 };
644
645 static const u8 ports_m2[] = {
646 /* register, region length */
647 0x04, 1,
648 0x09, 1,
649 0x2c, 2,
650 0x35, 4,
651 0x56, 7,
652 0x69, 4,
653 };
654
655 int i, ports_size, err;
656 const u8 *ports;
657
658 switch (type) {
659 case smsc47m1:
660 default:
661 ports = ports_m1;
662 ports_size = ARRAY_SIZE(ports_m1);
663 break;
664 case smsc47m2:
665 ports = ports_m2;
666 ports_size = ARRAY_SIZE(ports_m2);
667 break;
668 }
669
670 for (i = 0; i + 1 < ports_size; i += 2) {
671 unsigned short start = address + ports[i];
672 unsigned short len = ports[i + 1];
673
674 switch (action) {
675 case CHECK:
676 /* Only check for conflicts */
677 err = acpi_check_region(start, len, DRVNAME);
678 if (err)
679 return err;
680 break;
681 case REQUEST:
682 /* Request the resources */
683 if (!devm_request_region(dev, start, len, DRVNAME)) {
684 dev_err(dev,
685 "Region 0x%x-0x%x already in use!\n",
686 start, start + len);
687 return -EBUSY;
688 }
689 break;
690 }
691 }
692
693 return 0;
694 }
695
smsc47m1_remove_files(struct device * dev)696 static void smsc47m1_remove_files(struct device *dev)
697 {
698 sysfs_remove_group(&dev->kobj, &smsc47m1_group);
699 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1);
700 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2);
701 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3);
702 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1);
703 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2);
704 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3);
705 }
706
smsc47m1_probe(struct platform_device * pdev)707 static int __init smsc47m1_probe(struct platform_device *pdev)
708 {
709 struct device *dev = &pdev->dev;
710 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev);
711 struct smsc47m1_data *data;
712 struct resource *res;
713 int err;
714 int fan1, fan2, fan3, pwm1, pwm2, pwm3;
715
716 static const char * const names[] = {
717 "smsc47m1",
718 "smsc47m2",
719 };
720
721 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
722 err = smsc47m1_handle_resources(res->start, sio_data->type,
723 REQUEST, dev);
724 if (err < 0)
725 return err;
726
727 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL);
728 if (!data)
729 return -ENOMEM;
730
731 data->addr = res->start;
732 data->type = sio_data->type;
733 data->name = names[sio_data->type];
734 mutex_init(&data->update_lock);
735 platform_set_drvdata(pdev, data);
736
737 /*
738 * If no function is properly configured, there's no point in
739 * actually registering the chip.
740 */
741 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
742 == 0x04;
743 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
744 == 0x04;
745 if (data->type == smsc47m2) {
746 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
747 & 0x0d) == 0x09;
748 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
749 & 0x0d) == 0x09;
750 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
751 & 0x0d) == 0x0d;
752 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
753 & 0x0d) == 0x08;
754 } else {
755 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
756 & 0x05) == 0x05;
757 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
758 & 0x05) == 0x05;
759 fan3 = 0;
760 pwm3 = 0;
761 }
762 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
763 dev_warn(dev, "Device not configured, will not use\n");
764 return -ENODEV;
765 }
766
767 /*
768 * Some values (fan min, clock dividers, pwm registers) may be
769 * needed before any update is triggered, so we better read them
770 * at least once here. We don't usually do it that way, but in
771 * this particular case, manually reading 5 registers out of 8
772 * doesn't make much sense and we're better using the existing
773 * function.
774 */
775 smsc47m1_update_device(dev, 1);
776
777 /* Register sysfs hooks */
778 if (fan1) {
779 err = sysfs_create_group(&dev->kobj,
780 &smsc47m1_group_fan1);
781 if (err)
782 goto error_remove_files;
783 } else
784 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");
785
786 if (fan2) {
787 err = sysfs_create_group(&dev->kobj,
788 &smsc47m1_group_fan2);
789 if (err)
790 goto error_remove_files;
791 } else
792 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");
793
794 if (fan3) {
795 err = sysfs_create_group(&dev->kobj,
796 &smsc47m1_group_fan3);
797 if (err)
798 goto error_remove_files;
799 } else if (data->type == smsc47m2)
800 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");
801
802 if (pwm1) {
803 err = sysfs_create_group(&dev->kobj,
804 &smsc47m1_group_pwm1);
805 if (err)
806 goto error_remove_files;
807 } else
808 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");
809
810 if (pwm2) {
811 err = sysfs_create_group(&dev->kobj,
812 &smsc47m1_group_pwm2);
813 if (err)
814 goto error_remove_files;
815 } else
816 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");
817
818 if (pwm3) {
819 err = sysfs_create_group(&dev->kobj,
820 &smsc47m1_group_pwm3);
821 if (err)
822 goto error_remove_files;
823 } else if (data->type == smsc47m2)
824 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");
825
826 err = sysfs_create_group(&dev->kobj, &smsc47m1_group);
827 if (err)
828 goto error_remove_files;
829
830 data->hwmon_dev = hwmon_device_register(dev);
831 if (IS_ERR(data->hwmon_dev)) {
832 err = PTR_ERR(data->hwmon_dev);
833 goto error_remove_files;
834 }
835
836 return 0;
837
838 error_remove_files:
839 smsc47m1_remove_files(dev);
840 return err;
841 }
842
smsc47m1_remove(struct platform_device * pdev)843 static int __exit smsc47m1_remove(struct platform_device *pdev)
844 {
845 struct smsc47m1_data *data = platform_get_drvdata(pdev);
846
847 hwmon_device_unregister(data->hwmon_dev);
848 smsc47m1_remove_files(&pdev->dev);
849
850 return 0;
851 }
852
853 static struct platform_driver smsc47m1_driver = {
854 .driver = {
855 .name = DRVNAME,
856 },
857 .remove = __exit_p(smsc47m1_remove),
858 };
859
smsc47m1_device_add(unsigned short address,const struct smsc47m1_sio_data * sio_data)860 static int __init smsc47m1_device_add(unsigned short address,
861 const struct smsc47m1_sio_data *sio_data)
862 {
863 struct resource res = {
864 .start = address,
865 .end = address + SMSC_EXTENT - 1,
866 .name = DRVNAME,
867 .flags = IORESOURCE_IO,
868 };
869 int err;
870
871 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
872 if (err)
873 goto exit;
874
875 pdev = platform_device_alloc(DRVNAME, address);
876 if (!pdev) {
877 err = -ENOMEM;
878 pr_err("Device allocation failed\n");
879 goto exit;
880 }
881
882 err = platform_device_add_resources(pdev, &res, 1);
883 if (err) {
884 pr_err("Device resource addition failed (%d)\n", err);
885 goto exit_device_put;
886 }
887
888 err = platform_device_add_data(pdev, sio_data,
889 sizeof(struct smsc47m1_sio_data));
890 if (err) {
891 pr_err("Platform data allocation failed\n");
892 goto exit_device_put;
893 }
894
895 err = platform_device_add(pdev);
896 if (err) {
897 pr_err("Device addition failed (%d)\n", err);
898 goto exit_device_put;
899 }
900
901 return 0;
902
903 exit_device_put:
904 platform_device_put(pdev);
905 exit:
906 return err;
907 }
908
sm_smsc47m1_init(void)909 static int __init sm_smsc47m1_init(void)
910 {
911 int err;
912 unsigned short address;
913 struct smsc47m1_sio_data sio_data;
914
915 err = smsc47m1_find(&sio_data);
916 if (err < 0)
917 return err;
918 address = err;
919
920 /* Sets global pdev as a side effect */
921 err = smsc47m1_device_add(address, &sio_data);
922 if (err)
923 return err;
924
925 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
926 if (err)
927 goto exit_device;
928
929 return 0;
930
931 exit_device:
932 platform_device_unregister(pdev);
933 smsc47m1_restore(&sio_data);
934 return err;
935 }
936
sm_smsc47m1_exit(void)937 static void __exit sm_smsc47m1_exit(void)
938 {
939 platform_driver_unregister(&smsc47m1_driver);
940 smsc47m1_restore(dev_get_platdata(&pdev->dev));
941 platform_device_unregister(pdev);
942 }
943
944 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
945 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
946 MODULE_LICENSE("GPL");
947
948 module_init(sm_smsc47m1_init);
949 module_exit(sm_smsc47m1_exit);
950