Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/hwmon/smsc47m1.c

  1 /*
  2  * smsc47m1.c - Part of lm_sensors, Linux kernel modules
  3  *              for hardware monitoring
  4  *
  5  * Supports the SMSC LPC47B27x, LPC47M10x, 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
 60 superio_outb(int reg, int val)
 61 {
 62         outb(reg, REG);
 63         outb(val, VAL);
 64 }
 65 
 66 static inline int
 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
 77 superio_enter(void)
 78 {
 79         outb(0x55, REG);
 80 }
 81 
 82 static inline 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 
145 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
146 {
147         return inb_p(data->addr + reg);
148 }
149 
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 
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 
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 
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 
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 
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 
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 
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 
267 static ssize_t get_alarms(struct device *dev, struct device_attribute
268                           *devattr, char *buf)
269 {
270         struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
271         return sprintf(buf, "%d\n", data->alarms);
272 }
273 
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  */
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 
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 
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(alarms, S_IRUGO, get_alarms, NULL);
444 
445 static ssize_t show_name(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(name, S_IRUGO, show_name, NULL);
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 
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 */
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  */
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 
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 
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 
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                 .owner  = THIS_MODULE,
853                 .name   = DRVNAME,
854         },
855         .remove         = __exit_p(smsc47m1_remove),
856 };
857 
858 static int __init smsc47m1_device_add(unsigned short address,
859                                       const struct smsc47m1_sio_data *sio_data)
860 {
861         struct resource res = {
862                 .start  = address,
863                 .end    = address + SMSC_EXTENT - 1,
864                 .name   = DRVNAME,
865                 .flags  = IORESOURCE_IO,
866         };
867         int err;
868 
869         err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
870         if (err)
871                 goto exit;
872 
873         pdev = platform_device_alloc(DRVNAME, address);
874         if (!pdev) {
875                 err = -ENOMEM;
876                 pr_err("Device allocation failed\n");
877                 goto exit;
878         }
879 
880         err = platform_device_add_resources(pdev, &res, 1);
881         if (err) {
882                 pr_err("Device resource addition failed (%d)\n", err);
883                 goto exit_device_put;
884         }
885 
886         err = platform_device_add_data(pdev, sio_data,
887                                        sizeof(struct smsc47m1_sio_data));
888         if (err) {
889                 pr_err("Platform data allocation failed\n");
890                 goto exit_device_put;
891         }
892 
893         err = platform_device_add(pdev);
894         if (err) {
895                 pr_err("Device addition failed (%d)\n", err);
896                 goto exit_device_put;
897         }
898 
899         return 0;
900 
901 exit_device_put:
902         platform_device_put(pdev);
903 exit:
904         return err;
905 }
906 
907 static int __init sm_smsc47m1_init(void)
908 {
909         int err;
910         unsigned short address;
911         struct smsc47m1_sio_data sio_data;
912 
913         err = smsc47m1_find(&sio_data);
914         if (err < 0)
915                 return err;
916         address = err;
917 
918         /* Sets global pdev as a side effect */
919         err = smsc47m1_device_add(address, &sio_data);
920         if (err)
921                 return err;
922 
923         err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
924         if (err)
925                 goto exit_device;
926 
927         return 0;
928 
929 exit_device:
930         platform_device_unregister(pdev);
931         smsc47m1_restore(&sio_data);
932         return err;
933 }
934 
935 static void __exit sm_smsc47m1_exit(void)
936 {
937         platform_driver_unregister(&smsc47m1_driver);
938         smsc47m1_restore(dev_get_platdata(&pdev->dev));
939         platform_device_unregister(pdev);
940 }
941 
942 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
943 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
944 MODULE_LICENSE("GPL");
945 
946 module_init(sm_smsc47m1_init);
947 module_exit(sm_smsc47m1_exit);
948 

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