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);