1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
  4 *	       monitoring
  5 * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
  6 *			     Kyösti Mälkki <kmalkki@cc.hut.fi>
  7 * Copyright (c) 2005	Maarten Deprez <maartendeprez@users.sourceforge.net>
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/init.h>
 12#include <linux/slab.h>
 13#include <linux/jiffies.h>
 14#include <linux/i2c.h>
 15#include <linux/hwmon.h>
 16#include <linux/hwmon-sysfs.h>
 17#include <linux/hwmon-vid.h>
 18#include <linux/err.h>
 19#include <linux/mutex.h>
 20#include <linux/sysfs.h>
 21
 22/* Type of the extra sensor */
 23static unsigned short extra_sensor_type;
 24module_param(extra_sensor_type, ushort, 0);
 25MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");
 26
 27/* Addresses to scan */
 28static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
 29
 30/*
 31 * Many GL520 constants specified below
 32 * One of the inputs can be configured as either temp or voltage.
 33 * That's why _TEMP2 and _IN4 access the same register
 34 */
 35
 36/* The GL520 registers */
 37#define GL520_REG_CHIP_ID		0x00
 38#define GL520_REG_REVISION		0x01
 39#define GL520_REG_CONF			0x03
 40#define GL520_REG_MASK			0x11
 41
 42#define GL520_REG_VID_INPUT		0x02
 43
 44static const u8 GL520_REG_IN_INPUT[]	= { 0x15, 0x14, 0x13, 0x0d, 0x0e };
 45static const u8 GL520_REG_IN_LIMIT[]	= { 0x0c, 0x09, 0x0a, 0x0b };
 46static const u8 GL520_REG_IN_MIN[]	= { 0x0c, 0x09, 0x0a, 0x0b, 0x18 };
 47static const u8 GL520_REG_IN_MAX[]	= { 0x0c, 0x09, 0x0a, 0x0b, 0x17 };
 48
 49static const u8 GL520_REG_TEMP_INPUT[]		= { 0x04, 0x0e };
 50static const u8 GL520_REG_TEMP_MAX[]		= { 0x05, 0x17 };
 51static const u8 GL520_REG_TEMP_MAX_HYST[]	= { 0x06, 0x18 };
 52
 53#define GL520_REG_FAN_INPUT		0x07
 54#define GL520_REG_FAN_MIN		0x08
 55#define GL520_REG_FAN_DIV		0x0f
 56#define GL520_REG_FAN_OFF		GL520_REG_FAN_DIV
 57
 58#define GL520_REG_ALARMS		0x12
 59#define GL520_REG_BEEP_MASK		0x10
 60#define GL520_REG_BEEP_ENABLE		GL520_REG_CONF
 61
 62/* Client data */
 63struct gl520_data {
 64	struct i2c_client *client;
 65	const struct attribute_group *groups[3];
 66	struct mutex update_lock;
 67	char valid;		/* zero until the following fields are valid */
 68	unsigned long last_updated;	/* in jiffies */
 69
 70	u8 vid;
 71	u8 vrm;
 72	u8 in_input[5];		/* [0] = VVD */
 73	u8 in_min[5];		/* [0] = VDD */
 74	u8 in_max[5];		/* [0] = VDD */
 75	u8 fan_input[2];
 76	u8 fan_min[2];
 77	u8 fan_div[2];
 78	u8 fan_off;
 79	u8 temp_input[2];
 80	u8 temp_max[2];
 81	u8 temp_max_hyst[2];
 82	u8 alarms;
 83	u8 beep_enable;
 84	u8 beep_mask;
 85	u8 alarm_mask;
 86	u8 two_temps;
 87};
 88
 89/*
 90 * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 91 * GL520 uses a high-byte first convention
 92 */
 93static int gl520_read_value(struct i2c_client *client, u8 reg)
 94{
 95	if ((reg >= 0x07) && (reg <= 0x0c))
 96		return i2c_smbus_read_word_swapped(client, reg);
 97	else
 98		return i2c_smbus_read_byte_data(client, reg);
 99}
100
101static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
102{
103	if ((reg >= 0x07) && (reg <= 0x0c))
104		return i2c_smbus_write_word_swapped(client, reg, value);
105	else
106		return i2c_smbus_write_byte_data(client, reg, value);
107}
108
109static struct gl520_data *gl520_update_device(struct device *dev)
110{
111	struct gl520_data *data = dev_get_drvdata(dev);
112	struct i2c_client *client = data->client;
113	int val, i;
114
115	mutex_lock(&data->update_lock);
116
117	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
118
119		dev_dbg(&client->dev, "Starting gl520sm update\n");
120
121		data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
122		data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
123		data->vid = gl520_read_value(client,
124					     GL520_REG_VID_INPUT) & 0x1f;
125
126		for (i = 0; i < 4; i++) {
127			data->in_input[i] = gl520_read_value(client,
128							GL520_REG_IN_INPUT[i]);
129			val = gl520_read_value(client, GL520_REG_IN_LIMIT[i]);
130			data->in_min[i] = val & 0xff;
131			data->in_max[i] = (val >> 8) & 0xff;
132		}
133
134		val = gl520_read_value(client, GL520_REG_FAN_INPUT);
135		data->fan_input[0] = (val >> 8) & 0xff;
136		data->fan_input[1] = val & 0xff;
137
138		val = gl520_read_value(client, GL520_REG_FAN_MIN);
139		data->fan_min[0] = (val >> 8) & 0xff;
140		data->fan_min[1] = val & 0xff;
141
142		data->temp_input[0] = gl520_read_value(client,
143						GL520_REG_TEMP_INPUT[0]);
144		data->temp_max[0] = gl520_read_value(client,
145						GL520_REG_TEMP_MAX[0]);
146		data->temp_max_hyst[0] = gl520_read_value(client,
147						GL520_REG_TEMP_MAX_HYST[0]);
148
149		val = gl520_read_value(client, GL520_REG_FAN_DIV);
150		data->fan_div[0] = (val >> 6) & 0x03;
151		data->fan_div[1] = (val >> 4) & 0x03;
152		data->fan_off = (val >> 2) & 0x01;
153
154		data->alarms &= data->alarm_mask;
155
156		val = gl520_read_value(client, GL520_REG_CONF);
157		data->beep_enable = !((val >> 2) & 1);
158
159		/* Temp1 and Vin4 are the same input */
160		if (data->two_temps) {
161			data->temp_input[1] = gl520_read_value(client,
162						GL520_REG_TEMP_INPUT[1]);
163			data->temp_max[1] = gl520_read_value(client,
164						GL520_REG_TEMP_MAX[1]);
165			data->temp_max_hyst[1] = gl520_read_value(client,
166						GL520_REG_TEMP_MAX_HYST[1]);
167		} else {
168			data->in_input[4] = gl520_read_value(client,
169						GL520_REG_IN_INPUT[4]);
170			data->in_min[4] = gl520_read_value(client,
171						GL520_REG_IN_MIN[4]);
172			data->in_max[4] = gl520_read_value(client,
173						GL520_REG_IN_MAX[4]);
174		}
175
176		data->last_updated = jiffies;
177		data->valid = 1;
178	}
179
180	mutex_unlock(&data->update_lock);
181
182	return data;
183}
184
185/*
186 * Sysfs stuff
187 */
188
189static ssize_t cpu0_vid_show(struct device *dev,
190			     struct device_attribute *attr, char *buf)
191{
192	struct gl520_data *data = gl520_update_device(dev);
193	return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
194}
195static DEVICE_ATTR_RO(cpu0_vid);
196
197#define VDD_FROM_REG(val)	DIV_ROUND_CLOSEST((val) * 95, 4)
198#define VDD_CLAMP(val)		clamp_val(val, 0, 255 * 95 / 4)
199#define VDD_TO_REG(val)		DIV_ROUND_CLOSEST(VDD_CLAMP(val) * 4, 95)
200
201#define IN_FROM_REG(val)	((val) * 19)
202#define IN_CLAMP(val)		clamp_val(val, 0, 255 * 19)
203#define IN_TO_REG(val)		DIV_ROUND_CLOSEST(IN_CLAMP(val), 19)
204
205static ssize_t in_input_show(struct device *dev,
206			     struct device_attribute *attr, char *buf)
207{
208	int n = to_sensor_dev_attr(attr)->index;
209	struct gl520_data *data = gl520_update_device(dev);
210	u8 r = data->in_input[n];
211
212	if (n == 0)
213		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
214	else
215		return sprintf(buf, "%d\n", IN_FROM_REG(r));
216}
217
218static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
219			   char *buf)
220{
221	int n = to_sensor_dev_attr(attr)->index;
222	struct gl520_data *data = gl520_update_device(dev);
223	u8 r = data->in_min[n];
224
225	if (n == 0)
226		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
227	else
228		return sprintf(buf, "%d\n", IN_FROM_REG(r));
229}
230
231static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
232			   char *buf)
233{
234	int n = to_sensor_dev_attr(attr)->index;
235	struct gl520_data *data = gl520_update_device(dev);
236	u8 r = data->in_max[n];
237
238	if (n == 0)
239		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
240	else
241		return sprintf(buf, "%d\n", IN_FROM_REG(r));
242}
243
244static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
245			    const char *buf, size_t count)
246{
247	struct gl520_data *data = dev_get_drvdata(dev);
248	struct i2c_client *client = data->client;
249	int n = to_sensor_dev_attr(attr)->index;
250	u8 r;
251	long v;
252	int err;
253
254	err = kstrtol(buf, 10, &v);
255	if (err)
256		return err;
257
258	mutex_lock(&data->update_lock);
259
260	if (n == 0)
261		r = VDD_TO_REG(v);
262	else
263		r = IN_TO_REG(v);
264
265	data->in_min[n] = r;
266
267	if (n < 4)
268		gl520_write_value(client, GL520_REG_IN_MIN[n],
269				  (gl520_read_value(client, GL520_REG_IN_MIN[n])
270				   & ~0xff) | r);
271	else
272		gl520_write_value(client, GL520_REG_IN_MIN[n], r);
273
274	mutex_unlock(&data->update_lock);
275	return count;
276}
277
278static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
279			    const char *buf, size_t count)
280{
281	struct gl520_data *data = dev_get_drvdata(dev);
282	struct i2c_client *client = data->client;
283	int n = to_sensor_dev_attr(attr)->index;
284	u8 r;
285	long v;
286	int err;
287
288	err = kstrtol(buf, 10, &v);
289	if (err)
290		return err;
291
292	if (n == 0)
293		r = VDD_TO_REG(v);
294	else
295		r = IN_TO_REG(v);
296
297	mutex_lock(&data->update_lock);
298
299	data->in_max[n] = r;
300
301	if (n < 4)
302		gl520_write_value(client, GL520_REG_IN_MAX[n],
303				  (gl520_read_value(client, GL520_REG_IN_MAX[n])
304				   & ~0xff00) | (r << 8));
305	else
306		gl520_write_value(client, GL520_REG_IN_MAX[n], r);
307
308	mutex_unlock(&data->update_lock);
309	return count;
310}
311
312static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
313static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
314static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
315static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
316static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
317static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
318static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
319static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
320static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
321static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
322static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
323static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
324static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
325static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
326static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
327
328#define DIV_FROM_REG(val) (1 << (val))
329#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : (480000 / ((val) << (div))))
330
331#define FAN_BASE(div)		(480000 >> (div))
332#define FAN_CLAMP(val, div)	clamp_val(val, FAN_BASE(div) / 255, \
333					  FAN_BASE(div))
334#define FAN_TO_REG(val, div)	((val) == 0 ? 0 : \
335				 DIV_ROUND_CLOSEST(480000, \
336						FAN_CLAMP(val, div) << (div)))
337
338static ssize_t fan_input_show(struct device *dev,
339			      struct device_attribute *attr, char *buf)
340{
341	int n = to_sensor_dev_attr(attr)->index;
342	struct gl520_data *data = gl520_update_device(dev);
343
344	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n],
345						 data->fan_div[n]));
346}
347
348static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
349			    char *buf)
350{
351	int n = to_sensor_dev_attr(attr)->index;
352	struct gl520_data *data = gl520_update_device(dev);
353
354	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n],
355						 data->fan_div[n]));
356}
357
358static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
359			    char *buf)
360{
361	int n = to_sensor_dev_attr(attr)->index;
362	struct gl520_data *data = gl520_update_device(dev);
363
364	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n]));
365}
366
367static ssize_t fan1_off_show(struct device *dev,
368			     struct device_attribute *attr, char *buf)
369{
370	struct gl520_data *data = gl520_update_device(dev);
371	return sprintf(buf, "%d\n", data->fan_off);
372}
373
374static ssize_t fan_min_store(struct device *dev,
375			     struct device_attribute *attr, const char *buf,
376			     size_t count)
377{
378	struct gl520_data *data = dev_get_drvdata(dev);
379	struct i2c_client *client = data->client;
380	int n = to_sensor_dev_attr(attr)->index;
381	u8 r;
382	unsigned long v;
383	int err;
384
385	err = kstrtoul(buf, 10, &v);
386	if (err)
387		return err;
388
389	mutex_lock(&data->update_lock);
390	r = FAN_TO_REG(v, data->fan_div[n]);
391	data->fan_min[n] = r;
392
393	if (n == 0)
394		gl520_write_value(client, GL520_REG_FAN_MIN,
395				  (gl520_read_value(client, GL520_REG_FAN_MIN)
396				   & ~0xff00) | (r << 8));
397	else
398		gl520_write_value(client, GL520_REG_FAN_MIN,
399				  (gl520_read_value(client, GL520_REG_FAN_MIN)
400				   & ~0xff) | r);
401
402	data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
403	if (data->fan_min[n] == 0)
404		data->alarm_mask &= (n == 0) ? ~0x20 : ~0x40;
405	else
406		data->alarm_mask |= (n == 0) ? 0x20 : 0x40;
407	data->beep_mask &= data->alarm_mask;
408	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
409
410	mutex_unlock(&data->update_lock);
411	return count;
412}
413
414static ssize_t fan_div_store(struct device *dev,
415			     struct device_attribute *attr, const char *buf,
416			     size_t count)
417{
418	struct gl520_data *data = dev_get_drvdata(dev);
419	struct i2c_client *client = data->client;
420	int n = to_sensor_dev_attr(attr)->index;
421	u8 r;
422	unsigned long v;
423	int err;
424
425	err = kstrtoul(buf, 10, &v);
426	if (err)
427		return err;
428
429	switch (v) {
430	case 1:
431		r = 0;
432		break;
433	case 2:
434		r = 1;
435		break;
436	case 4:
437		r = 2;
438		break;
439	case 8:
440		r = 3;
441		break;
442	default:
443		dev_err(&client->dev,
444	"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
445		return -EINVAL;
446	}
447
448	mutex_lock(&data->update_lock);
449	data->fan_div[n] = r;
450
451	if (n == 0)
452		gl520_write_value(client, GL520_REG_FAN_DIV,
453				  (gl520_read_value(client, GL520_REG_FAN_DIV)
454				   & ~0xc0) | (r << 6));
455	else
456		gl520_write_value(client, GL520_REG_FAN_DIV,
457				  (gl520_read_value(client, GL520_REG_FAN_DIV)
458				   & ~0x30) | (r << 4));
459
460	mutex_unlock(&data->update_lock);
461	return count;
462}
463
464static ssize_t fan1_off_store(struct device *dev,
465			      struct device_attribute *attr, const char *buf,
466			      size_t count)
467{
468	struct gl520_data *data = dev_get_drvdata(dev);
469	struct i2c_client *client = data->client;
470	u8 r;
471	unsigned long v;
472	int err;
473
474	err = kstrtoul(buf, 10, &v);
475	if (err)
476		return err;
477
478	r = (v ? 1 : 0);
479
480	mutex_lock(&data->update_lock);
481	data->fan_off = r;
482	gl520_write_value(client, GL520_REG_FAN_OFF,
483			  (gl520_read_value(client, GL520_REG_FAN_OFF)
484			   & ~0x0c) | (r << 2));
485	mutex_unlock(&data->update_lock);
486	return count;
487}
488
489static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
490static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
491static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
492static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
493static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
494static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
495static DEVICE_ATTR_RW(fan1_off);
496
497#define TEMP_FROM_REG(val)	(((val) - 130) * 1000)
498#define TEMP_CLAMP(val)		clamp_val(val, -130000, 125000)
499#define TEMP_TO_REG(val)	(DIV_ROUND_CLOSEST(TEMP_CLAMP(val), 1000) + 130)
500
501static ssize_t temp_input_show(struct device *dev,
502			       struct device_attribute *attr, char *buf)
503{
504	int n = to_sensor_dev_attr(attr)->index;
505	struct gl520_data *data = gl520_update_device(dev);
506
507	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n]));
508}
509
510static ssize_t temp_max_show(struct device *dev,
511			     struct device_attribute *attr, char *buf)
512{
513	int n = to_sensor_dev_attr(attr)->index;
514	struct gl520_data *data = gl520_update_device(dev);
515
516	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n]));
517}
518
519static ssize_t temp_max_hyst_show(struct device *dev,
520				  struct device_attribute *attr, char *buf)
521{
522	int n = to_sensor_dev_attr(attr)->index;
523	struct gl520_data *data = gl520_update_device(dev);
524
525	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n]));
526}
527
528static ssize_t temp_max_store(struct device *dev,
529			      struct device_attribute *attr, const char *buf,
530			      size_t count)
531{
532	struct gl520_data *data = dev_get_drvdata(dev);
533	struct i2c_client *client = data->client;
534	int n = to_sensor_dev_attr(attr)->index;
535	long v;
536	int err;
537
538	err = kstrtol(buf, 10, &v);
539	if (err)
540		return err;
541
542	mutex_lock(&data->update_lock);
543	data->temp_max[n] = TEMP_TO_REG(v);
544	gl520_write_value(client, GL520_REG_TEMP_MAX[n], data->temp_max[n]);
545	mutex_unlock(&data->update_lock);
546	return count;
547}
548
549static ssize_t temp_max_hyst_store(struct device *dev,
550				   struct device_attribute *attr,
551				   const char *buf, size_t count)
552{
553	struct gl520_data *data = dev_get_drvdata(dev);
554	struct i2c_client *client = data->client;
555	int n = to_sensor_dev_attr(attr)->index;
556	long v;
557	int err;
558
559	err = kstrtol(buf, 10, &v);
560	if (err)
561		return err;
562
563	mutex_lock(&data->update_lock);
564	data->temp_max_hyst[n] = TEMP_TO_REG(v);
565	gl520_write_value(client, GL520_REG_TEMP_MAX_HYST[n],
566			  data->temp_max_hyst[n]);
567	mutex_unlock(&data->update_lock);
568	return count;
569}
570
571static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
572static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
573static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
574static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
575static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp_max_hyst, 0);
576static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, temp_max_hyst, 1);
577
578static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
579			   char *buf)
580{
581	struct gl520_data *data = gl520_update_device(dev);
582	return sprintf(buf, "%d\n", data->alarms);
583}
584
585static ssize_t beep_enable_show(struct device *dev,
586				struct device_attribute *attr, char *buf)
587{
588	struct gl520_data *data = gl520_update_device(dev);
589	return sprintf(buf, "%d\n", data->beep_enable);
590}
591
592static ssize_t beep_mask_show(struct device *dev,
593			      struct device_attribute *attr, char *buf)
594{
595	struct gl520_data *data = gl520_update_device(dev);
596	return sprintf(buf, "%d\n", data->beep_mask);
597}
598
599static ssize_t beep_enable_store(struct device *dev,
600				 struct device_attribute *attr,
601				 const char *buf, size_t count)
602{
603	struct gl520_data *data = dev_get_drvdata(dev);
604	struct i2c_client *client = data->client;
605	u8 r;
606	unsigned long v;
607	int err;
608
609	err = kstrtoul(buf, 10, &v);
610	if (err)
611		return err;
612
613	r = (v ? 0 : 1);
614
615	mutex_lock(&data->update_lock);
616	data->beep_enable = !r;
617	gl520_write_value(client, GL520_REG_BEEP_ENABLE,
618			  (gl520_read_value(client, GL520_REG_BEEP_ENABLE)
619			   & ~0x04) | (r << 2));
620	mutex_unlock(&data->update_lock);
621	return count;
622}
623
624static ssize_t beep_mask_store(struct device *dev,
625			       struct device_attribute *attr, const char *buf,
626			       size_t count)
627{
628	struct gl520_data *data = dev_get_drvdata(dev);
629	struct i2c_client *client = data->client;
630	unsigned long r;
631	int err;
632
633	err = kstrtoul(buf, 10, &r);
634	if (err)
635		return err;
636
637	mutex_lock(&data->update_lock);
638	r &= data->alarm_mask;
639	data->beep_mask = r;
640	gl520_write_value(client, GL520_REG_BEEP_MASK, r);
641	mutex_unlock(&data->update_lock);
642	return count;
643}
644
645static DEVICE_ATTR_RO(alarms);
646static DEVICE_ATTR_RW(beep_enable);
647static DEVICE_ATTR_RW(beep_mask);
648
649static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
650			  char *buf)
651{
652	int bit_nr = to_sensor_dev_attr(attr)->index;
653	struct gl520_data *data = gl520_update_device(dev);
654
655	return sprintf(buf, "%d\n", (data->alarms >> bit_nr) & 1);
656}
657
658static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
659static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
660static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
661static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
662static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
663static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 5);
664static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 6);
665static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 7);
666static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 7);
667
668static ssize_t beep_show(struct device *dev, struct device_attribute *attr,
669			 char *buf)
670{
671	int bitnr = to_sensor_dev_attr(attr)->index;
672	struct gl520_data *data = gl520_update_device(dev);
673
674	return sprintf(buf, "%d\n", (data->beep_mask >> bitnr) & 1);
675}
676
677static ssize_t beep_store(struct device *dev, struct device_attribute *attr,
678			  const char *buf, size_t count)
679{
680	struct gl520_data *data = dev_get_drvdata(dev);
681	struct i2c_client *client = data->client;
682	int bitnr = to_sensor_dev_attr(attr)->index;
683	unsigned long bit;
684
685	int err;
686
687	err = kstrtoul(buf, 10, &bit);
688	if (err)
689		return err;
690	if (bit & ~1)
691		return -EINVAL;
692
693	mutex_lock(&data->update_lock);
694	data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
695	if (bit)
696		data->beep_mask |= (1 << bitnr);
697	else
698		data->beep_mask &= ~(1 << bitnr);
699	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
700	mutex_unlock(&data->update_lock);
701	return count;
702}
703
704static SENSOR_DEVICE_ATTR_RW(in0_beep, beep, 0);
705static SENSOR_DEVICE_ATTR_RW(in1_beep, beep, 1);
706static SENSOR_DEVICE_ATTR_RW(in2_beep, beep, 2);
707static SENSOR_DEVICE_ATTR_RW(in3_beep, beep, 3);
708static SENSOR_DEVICE_ATTR_RW(temp1_beep, beep, 4);
709static SENSOR_DEVICE_ATTR_RW(fan1_beep, beep, 5);
710static SENSOR_DEVICE_ATTR_RW(fan2_beep, beep, 6);
711static SENSOR_DEVICE_ATTR_RW(temp2_beep, beep, 7);
712static SENSOR_DEVICE_ATTR_RW(in4_beep, beep, 7);
713
714static struct attribute *gl520_attributes[] = {
715	&dev_attr_cpu0_vid.attr,
716
717	&sensor_dev_attr_in0_input.dev_attr.attr,
718	&sensor_dev_attr_in0_min.dev_attr.attr,
719	&sensor_dev_attr_in0_max.dev_attr.attr,
720	&sensor_dev_attr_in0_alarm.dev_attr.attr,
721	&sensor_dev_attr_in0_beep.dev_attr.attr,
722	&sensor_dev_attr_in1_input.dev_attr.attr,
723	&sensor_dev_attr_in1_min.dev_attr.attr,
724	&sensor_dev_attr_in1_max.dev_attr.attr,
725	&sensor_dev_attr_in1_alarm.dev_attr.attr,
726	&sensor_dev_attr_in1_beep.dev_attr.attr,
727	&sensor_dev_attr_in2_input.dev_attr.attr,
728	&sensor_dev_attr_in2_min.dev_attr.attr,
729	&sensor_dev_attr_in2_max.dev_attr.attr,
730	&sensor_dev_attr_in2_alarm.dev_attr.attr,
731	&sensor_dev_attr_in2_beep.dev_attr.attr,
732	&sensor_dev_attr_in3_input.dev_attr.attr,
733	&sensor_dev_attr_in3_min.dev_attr.attr,
734	&sensor_dev_attr_in3_max.dev_attr.attr,
735	&sensor_dev_attr_in3_alarm.dev_attr.attr,
736	&sensor_dev_attr_in3_beep.dev_attr.attr,
737
738	&sensor_dev_attr_fan1_input.dev_attr.attr,
739	&sensor_dev_attr_fan1_min.dev_attr.attr,
740	&sensor_dev_attr_fan1_div.dev_attr.attr,
741	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
742	&sensor_dev_attr_fan1_beep.dev_attr.attr,
743	&dev_attr_fan1_off.attr,
744	&sensor_dev_attr_fan2_input.dev_attr.attr,
745	&sensor_dev_attr_fan2_min.dev_attr.attr,
746	&sensor_dev_attr_fan2_div.dev_attr.attr,
747	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
748	&sensor_dev_attr_fan2_beep.dev_attr.attr,
749
750	&sensor_dev_attr_temp1_input.dev_attr.attr,
751	&sensor_dev_attr_temp1_max.dev_attr.attr,
752	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
753	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
754	&sensor_dev_attr_temp1_beep.dev_attr.attr,
755
756	&dev_attr_alarms.attr,
757	&dev_attr_beep_enable.attr,
758	&dev_attr_beep_mask.attr,
759	NULL
760};
761
762static const struct attribute_group gl520_group = {
763	.attrs = gl520_attributes,
764};
765
766static struct attribute *gl520_attributes_in4[] = {
767	&sensor_dev_attr_in4_input.dev_attr.attr,
768	&sensor_dev_attr_in4_min.dev_attr.attr,
769	&sensor_dev_attr_in4_max.dev_attr.attr,
770	&sensor_dev_attr_in4_alarm.dev_attr.attr,
771	&sensor_dev_attr_in4_beep.dev_attr.attr,
772	NULL
773};
774
775static struct attribute *gl520_attributes_temp2[] = {
776	&sensor_dev_attr_temp2_input.dev_attr.attr,
777	&sensor_dev_attr_temp2_max.dev_attr.attr,
778	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
779	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
780	&sensor_dev_attr_temp2_beep.dev_attr.attr,
781	NULL
782};
783
784static const struct attribute_group gl520_group_in4 = {
785	.attrs = gl520_attributes_in4,
786};
787
788static const struct attribute_group gl520_group_temp2 = {
789	.attrs = gl520_attributes_temp2,
790};
791
792
793/*
794 * Real code
795 */
796
797/* Return 0 if detection is successful, -ENODEV otherwise */
798static int gl520_detect(struct i2c_client *client, struct i2c_board_info *info)
799{
800	struct i2c_adapter *adapter = client->adapter;
801
802	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
803				     I2C_FUNC_SMBUS_WORD_DATA))
804		return -ENODEV;
805
806	/* Determine the chip type. */
807	if ((gl520_read_value(client, GL520_REG_CHIP_ID) != 0x20) ||
808	    ((gl520_read_value(client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
809	    ((gl520_read_value(client, GL520_REG_CONF) & 0x80) != 0x00)) {
810		dev_dbg(&client->dev, "Unknown chip type, skipping\n");
811		return -ENODEV;
812	}
813
814	strlcpy(info->type, "gl520sm", I2C_NAME_SIZE);
815
816	return 0;
817}
818
819/* Called when we have found a new GL520SM. */
820static void gl520_init_client(struct i2c_client *client)
821{
822	struct gl520_data *data = i2c_get_clientdata(client);
823	u8 oldconf, conf;
824
825	conf = oldconf = gl520_read_value(client, GL520_REG_CONF);
826
827	data->alarm_mask = 0xff;
828	data->vrm = vid_which_vrm();
829
830	if (extra_sensor_type == 1)
831		conf &= ~0x10;
832	else if (extra_sensor_type == 2)
833		conf |= 0x10;
834	data->two_temps = !(conf & 0x10);
835
836	/* If IRQ# is disabled, we can safely force comparator mode */
837	if (!(conf & 0x20))
838		conf &= 0xf7;
839
840	/* Enable monitoring if needed */
841	conf |= 0x40;
842
843	if (conf != oldconf)
844		gl520_write_value(client, GL520_REG_CONF, conf);
845
846	gl520_update_device(&(client->dev));
847
848	if (data->fan_min[0] == 0)
849		data->alarm_mask &= ~0x20;
850	if (data->fan_min[1] == 0)
851		data->alarm_mask &= ~0x40;
852
853	data->beep_mask &= data->alarm_mask;
854	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
855}
856
857static int gl520_probe(struct i2c_client *client,
858		       const struct i2c_device_id *id)
859{
860	struct device *dev = &client->dev;
861	struct device *hwmon_dev;
862	struct gl520_data *data;
863
864	data = devm_kzalloc(dev, sizeof(struct gl520_data), GFP_KERNEL);
865	if (!data)
866		return -ENOMEM;
867
868	i2c_set_clientdata(client, data);
869	mutex_init(&data->update_lock);
870	data->client = client;
871
872	/* Initialize the GL520SM chip */
873	gl520_init_client(client);
874
875	/* sysfs hooks */
876	data->groups[0] = &gl520_group;
877
878	if (data->two_temps)
879		data->groups[1] = &gl520_group_temp2;
880	else
881		data->groups[1] = &gl520_group_in4;
882
883	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
884							   data, data->groups);
885	return PTR_ERR_OR_ZERO(hwmon_dev);
886}
887
888static const struct i2c_device_id gl520_id[] = {
889	{ "gl520sm", 0 },
890	{ }
891};
892MODULE_DEVICE_TABLE(i2c, gl520_id);
893
894static struct i2c_driver gl520_driver = {
895	.class		= I2C_CLASS_HWMON,
896	.driver = {
897		.name	= "gl520sm",
898	},
899	.probe		= gl520_probe,
900	.id_table	= gl520_id,
901	.detect		= gl520_detect,
902	.address_list	= normal_i2c,
903};
904
905module_i2c_driver(gl520_driver);
906
907MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
908	"Kyösti Mälkki <kmalkki@cc.hut.fi>, "
909	"Maarten Deprez <maartendeprez@users.sourceforge.net>");
910MODULE_DESCRIPTION("GL520SM driver");
911MODULE_LICENSE("GPL");