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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
32static unsigned short force_id;
33module_param(force_id, ushort, 0);
34MODULE_PARM_DESC(force_id, "Override the detected device ID");
35
36static struct platform_device *smsc47m1_pdev;
37
38#define DRVNAME "smsc47m1"
39enum 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
46static inline void
47superio_outb(int reg, int val)
48{
49 outb(reg, REG);
50 outb(val, VAL);
51}
52
53static inline int
54superio_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
63static inline int
64superio_enter(void)
65{
66 if (!request_muxed_region(REG, 2, DRVNAME))
67 return -EBUSY;
68
69 outb(0x55, REG);
70 return 0;
71}
72
73static inline void
74superio_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
95static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b };
96static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c };
97static 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
116struct 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
132struct smsc47m1_sio_data {
133 enum chips type;
134 u8 activate; /* Remember initial device state */
135};
136
137static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
138{
139 return inb_p(data->addr + reg);
140}
141
142static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
143 u8 value)
144{
145 outb_p(value, data->addr + reg);
146}
147
148static 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
197static 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
216static 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
227static 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
235static 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
243static 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
251static 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
259static 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
266static 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 */
303static 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
369static 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
395static 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
422static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
423static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
424static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
425static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0);
426static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
427static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_en, 0);
428static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
429static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
430static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
431static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1);
432static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
433static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_en, 1);
434static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
435static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
436static SENSOR_DEVICE_ATTR_RW(fan3_div, fan_div, 2);
437static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2);
438static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
439static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_en, 2);
440
441static DEVICE_ATTR_RO(alarms);
442
443static 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}
450static DEVICE_ATTR_RO(name);
451
452static 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
460static const struct attribute_group smsc47m1_group_fan1 = {
461 .attrs = smsc47m1_attributes_fan1,
462};
463
464static 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
472static const struct attribute_group smsc47m1_group_fan2 = {
473 .attrs = smsc47m1_attributes_fan2,
474};
475
476static 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
484static const struct attribute_group smsc47m1_group_fan3 = {
485 .attrs = smsc47m1_attributes_fan3,
486};
487
488static 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
494static const struct attribute_group smsc47m1_group_pwm1 = {
495 .attrs = smsc47m1_attributes_pwm1,
496};
497
498static 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
504static const struct attribute_group smsc47m1_group_pwm2 = {
505 .attrs = smsc47m1_attributes_pwm2,
506};
507
508static 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
514static const struct attribute_group smsc47m1_group_pwm3 = {
515 .attrs = smsc47m1_attributes_pwm3,
516};
517
518static struct attribute *smsc47m1_attributes[] = {
519 &dev_attr_alarms.attr,
520 &dev_attr_name.attr,
521 NULL
522};
523
524static const struct attribute_group smsc47m1_group = {
525 .attrs = smsc47m1_attributes,
526};
527
528static 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 */
610static 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 */
634static 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
696static 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
707static 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
838error_remove_files:
839 smsc47m1_remove_files(dev);
840 return err;
841}
842
843static void __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
851/*
852 * smsc47m1_remove() lives in .exit.text. For drivers registered via
853 * module_platform_driver_probe() this ok because they cannot get unbound at
854 * runtime. The driver needs to be marked with __refdata, otherwise modpost
855 * triggers a section mismatch warning.
856 */
857static struct platform_driver smsc47m1_driver __refdata = {
858 .driver = {
859 .name = DRVNAME,
860 },
861 .remove_new = __exit_p(smsc47m1_remove),
862};
863
864static int __init smsc47m1_device_add(unsigned short address,
865 const struct smsc47m1_sio_data *sio_data)
866{
867 const struct resource res = {
868 .start = address,
869 .end = address + SMSC_EXTENT - 1,
870 .name = DRVNAME,
871 .flags = IORESOURCE_IO,
872 };
873 const struct platform_device_info pdevinfo = {
874 .name = DRVNAME,
875 .id = address,
876 .res = &res,
877 .num_res = 1,
878 .data = sio_data,
879 .size_data = sizeof(struct smsc47m1_sio_data),
880 };
881 int err;
882
883 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
884 if (err)
885 return err;
886
887 smsc47m1_pdev = platform_device_register_full(&pdevinfo);
888 if (IS_ERR(smsc47m1_pdev)) {
889 pr_err("Device allocation failed\n");
890 return PTR_ERR(smsc47m1_pdev);
891 }
892
893 return 0;
894}
895
896static int __init sm_smsc47m1_init(void)
897{
898 int err;
899 unsigned short address;
900 struct smsc47m1_sio_data sio_data;
901
902 err = smsc47m1_find(&sio_data);
903 if (err < 0)
904 return err;
905 address = err;
906
907 /* Sets global smsc47m1_pdev as a side effect */
908 err = smsc47m1_device_add(address, &sio_data);
909 if (err)
910 return err;
911
912 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
913 if (err)
914 goto exit_device;
915
916 return 0;
917
918exit_device:
919 platform_device_unregister(smsc47m1_pdev);
920 smsc47m1_restore(&sio_data);
921 return err;
922}
923
924static void __exit sm_smsc47m1_exit(void)
925{
926 platform_driver_unregister(&smsc47m1_driver);
927 smsc47m1_restore(dev_get_platdata(&smsc47m1_pdev->dev));
928 platform_device_unregister(smsc47m1_pdev);
929}
930
931MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
932MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
933MODULE_LICENSE("GPL");
934
935module_init(sm_smsc47m1_init);
936module_exit(sm_smsc47m1_exit);
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
45static unsigned short force_id;
46module_param(force_id, ushort, 0);
47MODULE_PARM_DESC(force_id, "Override the detected device ID");
48
49static struct platform_device *pdev;
50
51#define DRVNAME "smsc47m1"
52enum 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
59static inline void
60superio_outb(int reg, int val)
61{
62 outb(reg, REG);
63 outb(val, VAL);
64}
65
66static inline int
67superio_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
76static inline void
77superio_enter(void)
78{
79 outb(0x55, REG);
80}
81
82static inline void
83superio_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
103static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b };
104static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c };
105static 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
124struct 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
140struct smsc47m1_sio_data {
141 enum chips type;
142 u8 activate; /* Remember initial device state */
143};
144
145
146static int __exit smsc47m1_remove(struct platform_device *pdev);
147static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
148 int init);
149
150static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
151{
152 return inb_p(data->addr + reg);
153}
154
155static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
156 u8 value)
157{
158 outb_p(value, data->addr + reg);
159}
160
161static struct platform_driver smsc47m1_driver = {
162 .driver = {
163 .owner = THIS_MODULE,
164 .name = DRVNAME,
165 },
166 .remove = __exit_p(smsc47m1_remove),
167};
168
169static ssize_t get_fan(struct device *dev, struct device_attribute
170 *devattr, char *buf)
171{
172 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
173 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
174 int nr = attr->index;
175 /*
176 * This chip (stupidly) stops monitoring fan speed if PWM is
177 * enabled and duty cycle is 0%. This is fine if the monitoring
178 * and control concern the same fan, but troublesome if they are
179 * not (which could as well happen).
180 */
181 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
182 FAN_FROM_REG(data->fan[nr],
183 DIV_FROM_REG(data->fan_div[nr]),
184 data->fan_preload[nr]);
185 return sprintf(buf, "%d\n", rpm);
186}
187
188static ssize_t get_fan_min(struct device *dev, struct device_attribute
189 *devattr, char *buf)
190{
191 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
192 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
193 int nr = attr->index;
194 int rpm = MIN_FROM_REG(data->fan_preload[nr],
195 DIV_FROM_REG(data->fan_div[nr]));
196 return sprintf(buf, "%d\n", rpm);
197}
198
199static ssize_t get_fan_div(struct device *dev, struct device_attribute
200 *devattr, char *buf)
201{
202 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
203 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
204 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
205}
206
207static ssize_t get_fan_alarm(struct device *dev, struct device_attribute
208 *devattr, char *buf)
209{
210 int bitnr = to_sensor_dev_attr(devattr)->index;
211 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
212 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
213}
214
215static ssize_t get_pwm(struct device *dev, struct device_attribute
216 *devattr, char *buf)
217{
218 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
219 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
220 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
221}
222
223static ssize_t get_pwm_en(struct device *dev, struct device_attribute
224 *devattr, char *buf)
225{
226 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
227 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
228 return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index]));
229}
230
231static ssize_t get_alarms(struct device *dev, struct device_attribute
232 *devattr, char *buf)
233{
234 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
235 return sprintf(buf, "%d\n", data->alarms);
236}
237
238static ssize_t set_fan_min(struct device *dev, struct device_attribute
239 *devattr, const char *buf, size_t count)
240{
241 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
242 struct smsc47m1_data *data = dev_get_drvdata(dev);
243 int nr = attr->index;
244 long rpmdiv;
245 long val;
246 int err;
247
248 err = kstrtol(buf, 10, &val);
249 if (err)
250 return err;
251
252 mutex_lock(&data->update_lock);
253 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
254
255 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
256 mutex_unlock(&data->update_lock);
257 return -EINVAL;
258 }
259
260 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
261 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
262 data->fan_preload[nr]);
263 mutex_unlock(&data->update_lock);
264
265 return count;
266}
267
268/*
269 * Note: we save and restore the fan minimum here, because its value is
270 * determined in part by the fan clock divider. This follows the principle
271 * of least surprise; the user doesn't expect the fan minimum to change just
272 * because the divider changed.
273 */
274static ssize_t set_fan_div(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 new_div;
281 int err;
282 long tmp;
283 u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
284
285 err = kstrtol(buf, 10, &new_div);
286 if (err)
287 return err;
288
289 if (new_div == old_div) /* No change */
290 return count;
291
292 mutex_lock(&data->update_lock);
293 switch (new_div) {
294 case 1:
295 data->fan_div[nr] = 0;
296 break;
297 case 2:
298 data->fan_div[nr] = 1;
299 break;
300 case 4:
301 data->fan_div[nr] = 2;
302 break;
303 case 8:
304 data->fan_div[nr] = 3;
305 break;
306 default:
307 mutex_unlock(&data->update_lock);
308 return -EINVAL;
309 }
310
311 switch (nr) {
312 case 0:
313 case 1:
314 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
315 & ~(0x03 << (4 + 2 * nr));
316 tmp |= data->fan_div[nr] << (4 + 2 * nr);
317 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
318 break;
319 case 2:
320 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
321 tmp |= data->fan_div[2] << 4;
322 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
323 break;
324 }
325
326 /* Preserve fan min */
327 tmp = 192 - (old_div * (192 - data->fan_preload[nr])
328 + new_div / 2) / new_div;
329 data->fan_preload[nr] = clamp_val(tmp, 0, 191);
330 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
331 data->fan_preload[nr]);
332 mutex_unlock(&data->update_lock);
333
334 return count;
335}
336
337static ssize_t set_pwm(struct device *dev, struct device_attribute
338 *devattr, const char *buf, size_t count)
339{
340 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
341 struct smsc47m1_data *data = dev_get_drvdata(dev);
342 int nr = attr->index;
343 long val;
344 int err;
345
346 err = kstrtol(buf, 10, &val);
347 if (err)
348 return err;
349
350 if (val < 0 || val > 255)
351 return -EINVAL;
352
353 mutex_lock(&data->update_lock);
354 data->pwm[nr] &= 0x81; /* Preserve additional bits */
355 data->pwm[nr] |= PWM_TO_REG(val);
356 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
357 data->pwm[nr]);
358 mutex_unlock(&data->update_lock);
359
360 return count;
361}
362
363static ssize_t set_pwm_en(struct device *dev, struct device_attribute
364 *devattr, const char *buf, size_t count)
365{
366 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
367 struct smsc47m1_data *data = dev_get_drvdata(dev);
368 int nr = attr->index;
369 unsigned long val;
370 int err;
371
372 err = kstrtoul(buf, 10, &val);
373 if (err)
374 return err;
375
376 if (val > 1)
377 return -EINVAL;
378
379 mutex_lock(&data->update_lock);
380 data->pwm[nr] &= 0xFE; /* preserve the other bits */
381 data->pwm[nr] |= !val;
382 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
383 data->pwm[nr]);
384 mutex_unlock(&data->update_lock);
385
386 return count;
387}
388
389#define fan_present(offset) \
390static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan, \
391 NULL, offset - 1); \
392static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
393 get_fan_min, set_fan_min, offset - 1); \
394static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
395 get_fan_div, set_fan_div, offset - 1); \
396static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm, \
397 NULL, offset - 1); \
398static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
399 get_pwm, set_pwm, offset - 1); \
400static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
401 get_pwm_en, set_pwm_en, offset - 1)
402
403fan_present(1);
404fan_present(2);
405fan_present(3);
406
407static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
408
409static ssize_t show_name(struct device *dev, struct device_attribute
410 *devattr, char *buf)
411{
412 struct smsc47m1_data *data = dev_get_drvdata(dev);
413
414 return sprintf(buf, "%s\n", data->name);
415}
416static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
417
418static struct attribute *smsc47m1_attributes_fan1[] = {
419 &sensor_dev_attr_fan1_input.dev_attr.attr,
420 &sensor_dev_attr_fan1_min.dev_attr.attr,
421 &sensor_dev_attr_fan1_div.dev_attr.attr,
422 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
423 NULL
424};
425
426static const struct attribute_group smsc47m1_group_fan1 = {
427 .attrs = smsc47m1_attributes_fan1,
428};
429
430static struct attribute *smsc47m1_attributes_fan2[] = {
431 &sensor_dev_attr_fan2_input.dev_attr.attr,
432 &sensor_dev_attr_fan2_min.dev_attr.attr,
433 &sensor_dev_attr_fan2_div.dev_attr.attr,
434 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
435 NULL
436};
437
438static const struct attribute_group smsc47m1_group_fan2 = {
439 .attrs = smsc47m1_attributes_fan2,
440};
441
442static struct attribute *smsc47m1_attributes_fan3[] = {
443 &sensor_dev_attr_fan3_input.dev_attr.attr,
444 &sensor_dev_attr_fan3_min.dev_attr.attr,
445 &sensor_dev_attr_fan3_div.dev_attr.attr,
446 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
447 NULL
448};
449
450static const struct attribute_group smsc47m1_group_fan3 = {
451 .attrs = smsc47m1_attributes_fan3,
452};
453
454static struct attribute *smsc47m1_attributes_pwm1[] = {
455 &sensor_dev_attr_pwm1.dev_attr.attr,
456 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
457 NULL
458};
459
460static const struct attribute_group smsc47m1_group_pwm1 = {
461 .attrs = smsc47m1_attributes_pwm1,
462};
463
464static struct attribute *smsc47m1_attributes_pwm2[] = {
465 &sensor_dev_attr_pwm2.dev_attr.attr,
466 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
467 NULL
468};
469
470static const struct attribute_group smsc47m1_group_pwm2 = {
471 .attrs = smsc47m1_attributes_pwm2,
472};
473
474static struct attribute *smsc47m1_attributes_pwm3[] = {
475 &sensor_dev_attr_pwm3.dev_attr.attr,
476 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
477 NULL
478};
479
480static const struct attribute_group smsc47m1_group_pwm3 = {
481 .attrs = smsc47m1_attributes_pwm3,
482};
483
484static struct attribute *smsc47m1_attributes[] = {
485 &dev_attr_alarms.attr,
486 &dev_attr_name.attr,
487 NULL
488};
489
490static const struct attribute_group smsc47m1_group = {
491 .attrs = smsc47m1_attributes,
492};
493
494static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
495{
496 u8 val;
497 unsigned short addr;
498
499 superio_enter();
500 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
501
502 /*
503 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
504 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
505 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
506 * can do much more besides (device id 0x60).
507 * The LPC47M997 is undocumented, but seems to be compatible with
508 * the LPC47M192, and has the same device id.
509 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
510 * supports a 3rd fan, and the pin configuration registers are
511 * unfortunately different.
512 * The LPC47M233 has the same device id (0x6B) but is not compatible.
513 * We check the high bit of the device revision register to
514 * differentiate them.
515 */
516 switch (val) {
517 case 0x51:
518 pr_info("Found SMSC LPC47B27x\n");
519 sio_data->type = smsc47m1;
520 break;
521 case 0x59:
522 pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
523 sio_data->type = smsc47m1;
524 break;
525 case 0x5F:
526 pr_info("Found SMSC LPC47M14x\n");
527 sio_data->type = smsc47m1;
528 break;
529 case 0x60:
530 pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
531 sio_data->type = smsc47m1;
532 break;
533 case 0x6B:
534 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
535 pr_debug("Found SMSC LPC47M233, unsupported\n");
536 superio_exit();
537 return -ENODEV;
538 }
539
540 pr_info("Found SMSC LPC47M292\n");
541 sio_data->type = smsc47m2;
542 break;
543 default:
544 superio_exit();
545 return -ENODEV;
546 }
547
548 superio_select();
549 addr = (superio_inb(SUPERIO_REG_BASE) << 8)
550 | superio_inb(SUPERIO_REG_BASE + 1);
551 if (addr == 0) {
552 pr_info("Device address not set, will not use\n");
553 superio_exit();
554 return -ENODEV;
555 }
556
557 /*
558 * Enable only if address is set (needed at least on the
559 * Compaq Presario S4000NX)
560 */
561 sio_data->activate = superio_inb(SUPERIO_REG_ACT);
562 if ((sio_data->activate & 0x01) == 0) {
563 pr_info("Enabling device\n");
564 superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
565 }
566
567 superio_exit();
568 return addr;
569}
570
571/* Restore device to its initial state */
572static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
573{
574 if ((sio_data->activate & 0x01) == 0) {
575 superio_enter();
576 superio_select();
577
578 pr_info("Disabling device\n");
579 superio_outb(SUPERIO_REG_ACT, sio_data->activate);
580
581 superio_exit();
582 }
583}
584
585#define CHECK 1
586#define REQUEST 2
587
588/*
589 * This function can be used to:
590 * - test for resource conflicts with ACPI
591 * - request the resources
592 * We only allocate the I/O ports we really need, to minimize the risk of
593 * conflicts with ACPI or with other drivers.
594 */
595static int __init smsc47m1_handle_resources(unsigned short address,
596 enum chips type, int action,
597 struct device *dev)
598{
599 static const u8 ports_m1[] = {
600 /* register, region length */
601 0x04, 1,
602 0x33, 4,
603 0x56, 7,
604 };
605
606 static const u8 ports_m2[] = {
607 /* register, region length */
608 0x04, 1,
609 0x09, 1,
610 0x2c, 2,
611 0x35, 4,
612 0x56, 7,
613 0x69, 4,
614 };
615
616 int i, ports_size, err;
617 const u8 *ports;
618
619 switch (type) {
620 case smsc47m1:
621 default:
622 ports = ports_m1;
623 ports_size = ARRAY_SIZE(ports_m1);
624 break;
625 case smsc47m2:
626 ports = ports_m2;
627 ports_size = ARRAY_SIZE(ports_m2);
628 break;
629 }
630
631 for (i = 0; i + 1 < ports_size; i += 2) {
632 unsigned short start = address + ports[i];
633 unsigned short len = ports[i + 1];
634
635 switch (action) {
636 case CHECK:
637 /* Only check for conflicts */
638 err = acpi_check_region(start, len, DRVNAME);
639 if (err)
640 return err;
641 break;
642 case REQUEST:
643 /* Request the resources */
644 if (!devm_request_region(dev, start, len, DRVNAME)) {
645 dev_err(dev,
646 "Region 0x%hx-0x%hx already in use!\n",
647 start, start + len);
648 return -EBUSY;
649 }
650 break;
651 }
652 }
653
654 return 0;
655}
656
657static void smsc47m1_remove_files(struct device *dev)
658{
659 sysfs_remove_group(&dev->kobj, &smsc47m1_group);
660 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1);
661 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2);
662 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3);
663 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1);
664 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2);
665 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3);
666}
667
668static int __init smsc47m1_probe(struct platform_device *pdev)
669{
670 struct device *dev = &pdev->dev;
671 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev);
672 struct smsc47m1_data *data;
673 struct resource *res;
674 int err;
675 int fan1, fan2, fan3, pwm1, pwm2, pwm3;
676
677 static const char * const names[] = {
678 "smsc47m1",
679 "smsc47m2",
680 };
681
682 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
683 err = smsc47m1_handle_resources(res->start, sio_data->type,
684 REQUEST, dev);
685 if (err < 0)
686 return err;
687
688 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL);
689 if (!data)
690 return -ENOMEM;
691
692 data->addr = res->start;
693 data->type = sio_data->type;
694 data->name = names[sio_data->type];
695 mutex_init(&data->update_lock);
696 platform_set_drvdata(pdev, data);
697
698 /*
699 * If no function is properly configured, there's no point in
700 * actually registering the chip.
701 */
702 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
703 == 0x04;
704 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
705 == 0x04;
706 if (data->type == smsc47m2) {
707 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
708 & 0x0d) == 0x09;
709 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
710 & 0x0d) == 0x09;
711 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
712 & 0x0d) == 0x0d;
713 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
714 & 0x0d) == 0x08;
715 } else {
716 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
717 & 0x05) == 0x05;
718 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
719 & 0x05) == 0x05;
720 fan3 = 0;
721 pwm3 = 0;
722 }
723 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
724 dev_warn(dev, "Device not configured, will not use\n");
725 return -ENODEV;
726 }
727
728 /*
729 * Some values (fan min, clock dividers, pwm registers) may be
730 * needed before any update is triggered, so we better read them
731 * at least once here. We don't usually do it that way, but in
732 * this particular case, manually reading 5 registers out of 8
733 * doesn't make much sense and we're better using the existing
734 * function.
735 */
736 smsc47m1_update_device(dev, 1);
737
738 /* Register sysfs hooks */
739 if (fan1) {
740 err = sysfs_create_group(&dev->kobj,
741 &smsc47m1_group_fan1);
742 if (err)
743 goto error_remove_files;
744 } else
745 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");
746
747 if (fan2) {
748 err = sysfs_create_group(&dev->kobj,
749 &smsc47m1_group_fan2);
750 if (err)
751 goto error_remove_files;
752 } else
753 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");
754
755 if (fan3) {
756 err = sysfs_create_group(&dev->kobj,
757 &smsc47m1_group_fan3);
758 if (err)
759 goto error_remove_files;
760 } else if (data->type == smsc47m2)
761 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");
762
763 if (pwm1) {
764 err = sysfs_create_group(&dev->kobj,
765 &smsc47m1_group_pwm1);
766 if (err)
767 goto error_remove_files;
768 } else
769 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");
770
771 if (pwm2) {
772 err = sysfs_create_group(&dev->kobj,
773 &smsc47m1_group_pwm2);
774 if (err)
775 goto error_remove_files;
776 } else
777 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");
778
779 if (pwm3) {
780 err = sysfs_create_group(&dev->kobj,
781 &smsc47m1_group_pwm3);
782 if (err)
783 goto error_remove_files;
784 } else if (data->type == smsc47m2)
785 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");
786
787 err = sysfs_create_group(&dev->kobj, &smsc47m1_group);
788 if (err)
789 goto error_remove_files;
790
791 data->hwmon_dev = hwmon_device_register(dev);
792 if (IS_ERR(data->hwmon_dev)) {
793 err = PTR_ERR(data->hwmon_dev);
794 goto error_remove_files;
795 }
796
797 return 0;
798
799error_remove_files:
800 smsc47m1_remove_files(dev);
801 return err;
802}
803
804static int __exit smsc47m1_remove(struct platform_device *pdev)
805{
806 struct smsc47m1_data *data = platform_get_drvdata(pdev);
807
808 hwmon_device_unregister(data->hwmon_dev);
809 smsc47m1_remove_files(&pdev->dev);
810
811 return 0;
812}
813
814static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
815 int init)
816{
817 struct smsc47m1_data *data = dev_get_drvdata(dev);
818
819 mutex_lock(&data->update_lock);
820
821 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
822 int i, fan_nr;
823 fan_nr = data->type == smsc47m2 ? 3 : 2;
824
825 for (i = 0; i < fan_nr; i++) {
826 data->fan[i] = smsc47m1_read_value(data,
827 SMSC47M1_REG_FAN[i]);
828 data->fan_preload[i] = smsc47m1_read_value(data,
829 SMSC47M1_REG_FAN_PRELOAD[i]);
830 data->pwm[i] = smsc47m1_read_value(data,
831 SMSC47M1_REG_PWM[i]);
832 }
833
834 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
835 data->fan_div[0] = (i >> 4) & 0x03;
836 data->fan_div[1] = i >> 6;
837
838 data->alarms = smsc47m1_read_value(data,
839 SMSC47M1_REG_ALARM) >> 6;
840 /* Clear alarms if needed */
841 if (data->alarms)
842 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);
843
844 if (fan_nr >= 3) {
845 data->fan_div[2] = (smsc47m1_read_value(data,
846 SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
847 data->alarms |= (smsc47m1_read_value(data,
848 SMSC47M2_REG_ALARM6) & 0x40) >> 4;
849 /* Clear alarm if needed */
850 if (data->alarms & 0x04)
851 smsc47m1_write_value(data,
852 SMSC47M2_REG_ALARM6,
853 0x40);
854 }
855
856 data->last_updated = jiffies;
857 }
858
859 mutex_unlock(&data->update_lock);
860 return data;
861}
862
863static int __init smsc47m1_device_add(unsigned short address,
864 const struct smsc47m1_sio_data *sio_data)
865{
866 struct resource res = {
867 .start = address,
868 .end = address + SMSC_EXTENT - 1,
869 .name = DRVNAME,
870 .flags = IORESOURCE_IO,
871 };
872 int err;
873
874 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
875 if (err)
876 goto exit;
877
878 pdev = platform_device_alloc(DRVNAME, address);
879 if (!pdev) {
880 err = -ENOMEM;
881 pr_err("Device allocation failed\n");
882 goto exit;
883 }
884
885 err = platform_device_add_resources(pdev, &res, 1);
886 if (err) {
887 pr_err("Device resource addition failed (%d)\n", err);
888 goto exit_device_put;
889 }
890
891 err = platform_device_add_data(pdev, sio_data,
892 sizeof(struct smsc47m1_sio_data));
893 if (err) {
894 pr_err("Platform data allocation failed\n");
895 goto exit_device_put;
896 }
897
898 err = platform_device_add(pdev);
899 if (err) {
900 pr_err("Device addition failed (%d)\n", err);
901 goto exit_device_put;
902 }
903
904 return 0;
905
906exit_device_put:
907 platform_device_put(pdev);
908exit:
909 return err;
910}
911
912static int __init sm_smsc47m1_init(void)
913{
914 int err;
915 unsigned short address;
916 struct smsc47m1_sio_data sio_data;
917
918 err = smsc47m1_find(&sio_data);
919 if (err < 0)
920 return err;
921 address = err;
922
923 /* Sets global pdev as a side effect */
924 err = smsc47m1_device_add(address, &sio_data);
925 if (err)
926 return err;
927
928 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
929 if (err)
930 goto exit_device;
931
932 return 0;
933
934exit_device:
935 platform_device_unregister(pdev);
936 smsc47m1_restore(&sio_data);
937 return err;
938}
939
940static void __exit sm_smsc47m1_exit(void)
941{
942 platform_driver_unregister(&smsc47m1_driver);
943 smsc47m1_restore(dev_get_platdata(&pdev->dev));
944 platform_device_unregister(pdev);
945}
946
947MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
948MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
949MODULE_LICENSE("GPL");
950
951module_init(sm_smsc47m1_init);
952module_exit(sm_smsc47m1_exit);