1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * lm87.c
   4 *
   5 * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
   6 *                          Philip Edelbrock <phil@netroedge.com>
   7 *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
   8 *                          Dan Eaton <dan.eaton@rocketlogix.com>
   9 * Copyright (C) 2004-2008  Jean Delvare <jdelvare@suse.de>
  10 *
  11 * Original port to Linux 2.6 by Jeff Oliver.
  12 *
  13 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
  14 * to 8 voltages (including its own power source), up to three temperatures
  15 * (its own plus up to two external ones) and up to two fans. The default
  16 * configuration is 6 voltages, two temperatures and two fans (see below).
  17 * Voltages are scaled internally with ratios such that the nominal value of
  18 * each voltage correspond to a register value of 192 (which means a
  19 * resolution of about 0.5% of the nominal value). Temperature values are
  20 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
  21 * datasheet can be obtained from National's website at:
  22 *   http://www.national.com/pf/LM/LM87.html
  23 *
  24 * Some functions share pins, so not all functions are available at the same
  25 * time. Which are depends on the hardware setup. This driver normally
  26 * assumes that firmware configured the chip correctly. Where this is not
  27 * the case, platform code must set the I2C client's platform_data to point
  28 * to a u8 value to be written to the channel register.
  29 * For reference, here is the list of exclusive functions:
  30 *  - in0+in5 (default) or temp3
  31 *  - fan1 (default) or in6
  32 *  - fan2 (default) or in7
  33 *  - VID lines (default) or IRQ lines (not handled by this driver)
  34 *
  35 * The LM87 additionally features an analog output, supposedly usable to
  36 * control the speed of a fan. All new chips use pulse width modulation
  37 * instead. The LM87 is the only hardware monitoring chipset I know of
  38 * which uses amplitude modulation. Be careful when using this feature.
  39 *
  40 * This driver also supports the ADM1024, a sensor chip made by Analog
  41 * Devices. That chip is fully compatible with the LM87. Complete
  42 * datasheet can be obtained from Analog's website at:
  43 *   https://www.analog.com/en/prod/0,2877,ADM1024,00.html
  44 */
  45
  46#include <linux/module.h>
  47#include <linux/init.h>
  48#include <linux/slab.h>
  49#include <linux/jiffies.h>
  50#include <linux/i2c.h>
  51#include <linux/hwmon.h>
  52#include <linux/hwmon-sysfs.h>
  53#include <linux/hwmon-vid.h>
  54#include <linux/err.h>
  55#include <linux/mutex.h>
  56#include <linux/regulator/consumer.h>
  57
  58/*
  59 * Addresses to scan
  60 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  61 */
  62
  63static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  64
  65/*
  66 * The LM87 registers
  67 */
  68
  69/* nr in 0..5 */
  70#define LM87_REG_IN(nr)			(0x20 + (nr))
  71#define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
  72#define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
  73/* nr in 0..1 */
  74#define LM87_REG_AIN(nr)		(0x28 + (nr))
  75#define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
  76#define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))
  77
  78static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  79static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  80static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  81
  82#define LM87_REG_TEMP_HW_INT_LOCK	0x13
  83#define LM87_REG_TEMP_HW_EXT_LOCK	0x14
  84#define LM87_REG_TEMP_HW_INT		0x17
  85#define LM87_REG_TEMP_HW_EXT		0x18
  86
  87/* nr in 0..1 */
  88#define LM87_REG_FAN(nr)		(0x28 + (nr))
  89#define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
  90#define LM87_REG_AOUT			0x19
  91
  92#define LM87_REG_CONFIG			0x40
  93#define LM87_REG_CHANNEL_MODE		0x16
  94#define LM87_REG_VID_FAN_DIV		0x47
  95#define LM87_REG_VID4			0x49
  96
  97#define LM87_REG_ALARMS1		0x41
  98#define LM87_REG_ALARMS2		0x42
  99
 100#define LM87_REG_COMPANY_ID		0x3E
 101#define LM87_REG_REVISION		0x3F
 102
 103/*
 104 * Conversions and various macros
 105 * The LM87 uses signed 8-bit values for temperatures.
 106 */
 107
 108#define IN_FROM_REG(reg, scale)	(((reg) * (scale) + 96) / 192)
 109#define IN_TO_REG(val, scale)	((val) <= 0 ? 0 : \
 110				 (val) >= (scale) * 255 / 192 ? 255 : \
 111				 ((val) * 192 + (scale) / 2) / (scale))
 112
 113#define TEMP_FROM_REG(reg)	((reg) * 1000)
 114#define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
 115				 (val) >= 126500 ? 127 : \
 116				 (((val) < 0 ? (val) - 500 : \
 117				   (val) + 500) / 1000))
 118
 119#define FAN_FROM_REG(reg, div)	((reg) == 255 || (reg) == 0 ? 0 : \
 120				 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
 121#define FAN_TO_REG(val, div)	((val) * (div) * 255 <= 1350000 ? 255 : \
 122				 (1350000 + (val)*(div) / 2) / ((val) * (div)))
 123
 124#define FAN_DIV_FROM_REG(reg)	(1 << (reg))
 125
 126/* analog out is 9.80mV/LSB */
 127#define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
 128#define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
 129				 (val) >= 2500 ? 255 : \
 130				 ((val) * 10 + 49) / 98)
 131
 132/* nr in 0..1 */
 133#define CHAN_NO_FAN(nr)		(1 << (nr))
 134#define CHAN_TEMP3		(1 << 2)
 135#define CHAN_VCC_5V		(1 << 3)
 136#define CHAN_NO_VID		(1 << 7)
 137
 138/*
 139 * Client data (each client gets its own)
 140 */
 141
 142struct lm87_data {
 143	struct mutex update_lock;
 144	char valid; /* zero until following fields are valid */
 145	unsigned long last_updated; /* In jiffies */
 146
 147	u8 channel;		/* register value */
 148	u8 config;		/* original register value */
 149
 150	u8 in[8];		/* register value */
 151	u8 in_max[8];		/* register value */
 152	u8 in_min[8];		/* register value */
 153	u16 in_scale[8];
 154
 155	s8 temp[3];		/* register value */
 156	s8 temp_high[3];	/* register value */
 157	s8 temp_low[3];		/* register value */
 158	s8 temp_crit_int;	/* min of two register values */
 159	s8 temp_crit_ext;	/* min of two register values */
 160
 161	u8 fan[2];		/* register value */
 162	u8 fan_min[2];		/* register value */
 163	u8 fan_div[2];		/* register value, shifted right */
 164	u8 aout;		/* register value */
 165
 166	u16 alarms;		/* register values, combined */
 167	u8 vid;			/* register values, combined */
 168	u8 vrm;
 169
 170	const struct attribute_group *attr_groups[6];
 171};
 172
 173static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 174{
 175	return i2c_smbus_read_byte_data(client, reg);
 176}
 177
 178static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 179{
 180	return i2c_smbus_write_byte_data(client, reg, value);
 181}
 182
 183static struct lm87_data *lm87_update_device(struct device *dev)
 184{
 185	struct i2c_client *client = dev_get_drvdata(dev);
 186	struct lm87_data *data = i2c_get_clientdata(client);
 187
 188	mutex_lock(&data->update_lock);
 189
 190	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 191		int i, j;
 192
 193		dev_dbg(&client->dev, "Updating data.\n");
 194
 195		i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 196		j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 197		for (; i < j; i++) {
 198			data->in[i] = lm87_read_value(client,
 199				      LM87_REG_IN(i));
 200			data->in_min[i] = lm87_read_value(client,
 201					  LM87_REG_IN_MIN(i));
 202			data->in_max[i] = lm87_read_value(client,
 203					  LM87_REG_IN_MAX(i));
 204		}
 205
 206		for (i = 0; i < 2; i++) {
 207			if (data->channel & CHAN_NO_FAN(i)) {
 208				data->in[6+i] = lm87_read_value(client,
 209						LM87_REG_AIN(i));
 210				data->in_max[6+i] = lm87_read_value(client,
 211						    LM87_REG_AIN_MAX(i));
 212				data->in_min[6+i] = lm87_read_value(client,
 213						    LM87_REG_AIN_MIN(i));
 214
 215			} else {
 216				data->fan[i] = lm87_read_value(client,
 217					       LM87_REG_FAN(i));
 218				data->fan_min[i] = lm87_read_value(client,
 219						   LM87_REG_FAN_MIN(i));
 220			}
 221		}
 222
 223		j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 224		for (i = 0 ; i < j; i++) {
 225			data->temp[i] = lm87_read_value(client,
 226					LM87_REG_TEMP[i]);
 227			data->temp_high[i] = lm87_read_value(client,
 228					     LM87_REG_TEMP_HIGH[i]);
 229			data->temp_low[i] = lm87_read_value(client,
 230					    LM87_REG_TEMP_LOW[i]);
 231		}
 232
 233		i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 234		j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 235		data->temp_crit_int = min(i, j);
 236
 237		i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 238		j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 239		data->temp_crit_ext = min(i, j);
 240
 241		i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 242		data->fan_div[0] = (i >> 4) & 0x03;
 243		data->fan_div[1] = (i >> 6) & 0x03;
 244		data->vid = (i & 0x0F)
 245			  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 246			     << 4;
 247
 248		data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 249			     | (lm87_read_value(client, LM87_REG_ALARMS2)
 250				<< 8);
 251		data->aout = lm87_read_value(client, LM87_REG_AOUT);
 252
 253		data->last_updated = jiffies;
 254		data->valid = 1;
 255	}
 256
 257	mutex_unlock(&data->update_lock);
 258
 259	return data;
 260}
 261
 262/*
 263 * Sysfs stuff
 264 */
 265
 266static ssize_t in_input_show(struct device *dev,
 267			     struct device_attribute *attr, char *buf)
 268{
 269	struct lm87_data *data = lm87_update_device(dev);
 270	int nr = to_sensor_dev_attr(attr)->index;
 271
 272	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
 273		       data->in_scale[nr]));
 274}
 275
 276static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
 277			   char *buf)
 278{
 279	struct lm87_data *data = lm87_update_device(dev);
 280	int nr = to_sensor_dev_attr(attr)->index;
 281
 282	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
 283		       data->in_scale[nr]));
 284}
 285
 286static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
 287			   char *buf)
 288{
 289	struct lm87_data *data = lm87_update_device(dev);
 290	int nr = to_sensor_dev_attr(attr)->index;
 291
 292	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
 293		       data->in_scale[nr]));
 294}
 295
 296static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
 297			    const char *buf, size_t count)
 298{
 299	struct i2c_client *client = dev_get_drvdata(dev);
 300	struct lm87_data *data = i2c_get_clientdata(client);
 301	int nr = to_sensor_dev_attr(attr)->index;
 302	long val;
 303	int err;
 304
 305	err = kstrtol(buf, 10, &val);
 306	if (err)
 307		return err;
 308
 309	mutex_lock(&data->update_lock);
 310	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 311	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
 312			 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
 313	mutex_unlock(&data->update_lock);
 314	return count;
 315}
 316
 317static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
 318			    const char *buf, size_t count)
 319{
 320	struct i2c_client *client = dev_get_drvdata(dev);
 321	struct lm87_data *data = i2c_get_clientdata(client);
 322	int nr = to_sensor_dev_attr(attr)->index;
 323	long val;
 324	int err;
 325
 326	err = kstrtol(buf, 10, &val);
 327	if (err)
 328		return err;
 329
 330	mutex_lock(&data->update_lock);
 331	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 332	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
 333			 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
 334	mutex_unlock(&data->update_lock);
 335	return count;
 336}
 337
 338static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
 339static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
 340static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
 341static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
 342static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
 343static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
 344static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
 345static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
 346static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
 347static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
 348static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
 349static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
 350static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
 351static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
 352static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
 353static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
 354static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
 355static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
 356static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
 357static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
 358static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
 359static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
 360static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
 361static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
 362
 363static ssize_t temp_input_show(struct device *dev,
 364			       struct device_attribute *attr, char *buf)
 365{
 366	struct lm87_data *data = lm87_update_device(dev);
 367	int nr = to_sensor_dev_attr(attr)->index;
 368
 369	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 370}
 371
 372static ssize_t temp_low_show(struct device *dev,
 373			     struct device_attribute *attr, char *buf)
 374{
 375	struct lm87_data *data = lm87_update_device(dev);
 376	int nr = to_sensor_dev_attr(attr)->index;
 377
 378	return sprintf(buf, "%d\n",
 379		       TEMP_FROM_REG(data->temp_low[nr]));
 380}
 381
 382static ssize_t temp_high_show(struct device *dev,
 383			      struct device_attribute *attr, char *buf)
 384{
 385	struct lm87_data *data = lm87_update_device(dev);
 386	int nr = to_sensor_dev_attr(attr)->index;
 387
 388	return sprintf(buf, "%d\n",
 389		       TEMP_FROM_REG(data->temp_high[nr]));
 390}
 391
 392static ssize_t temp_low_store(struct device *dev,
 393			      struct device_attribute *attr, const char *buf,
 394			      size_t count)
 395{
 396	struct i2c_client *client = dev_get_drvdata(dev);
 397	struct lm87_data *data = i2c_get_clientdata(client);
 398	int nr = to_sensor_dev_attr(attr)->index;
 399	long val;
 400	int err;
 401
 402	err = kstrtol(buf, 10, &val);
 403	if (err)
 404		return err;
 405
 406	mutex_lock(&data->update_lock);
 407	data->temp_low[nr] = TEMP_TO_REG(val);
 408	lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 409	mutex_unlock(&data->update_lock);
 410	return count;
 411}
 412
 413static ssize_t temp_high_store(struct device *dev,
 414			       struct device_attribute *attr, const char *buf,
 415			       size_t count)
 416{
 417	struct i2c_client *client = dev_get_drvdata(dev);
 418	struct lm87_data *data = i2c_get_clientdata(client);
 419	int nr = to_sensor_dev_attr(attr)->index;
 420	long val;
 421	int err;
 422
 423	err = kstrtol(buf, 10, &val);
 424	if (err)
 425		return err;
 426
 427	mutex_lock(&data->update_lock);
 428	data->temp_high[nr] = TEMP_TO_REG(val);
 429	lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 430	mutex_unlock(&data->update_lock);
 431	return count;
 432}
 433
 434static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 435static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
 436static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
 437static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 438static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
 439static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
 440static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 441static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
 442static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
 443
 444static ssize_t temp1_crit_show(struct device *dev,
 445			       struct device_attribute *attr, char *buf)
 446{
 447	struct lm87_data *data = lm87_update_device(dev);
 448	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 449}
 450
 451static ssize_t temp2_crit_show(struct device *dev,
 452			       struct device_attribute *attr, char *buf)
 453{
 454	struct lm87_data *data = lm87_update_device(dev);
 455	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 456}
 457
 458static DEVICE_ATTR_RO(temp1_crit);
 459static DEVICE_ATTR_RO(temp2_crit);
 460static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
 461
 462static ssize_t fan_input_show(struct device *dev,
 463			      struct device_attribute *attr, char *buf)
 464{
 465	struct lm87_data *data = lm87_update_device(dev);
 466	int nr = to_sensor_dev_attr(attr)->index;
 467
 468	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 469		       FAN_DIV_FROM_REG(data->fan_div[nr])));
 470}
 471
 472static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
 473			    char *buf)
 474{
 475	struct lm87_data *data = lm87_update_device(dev);
 476	int nr = to_sensor_dev_attr(attr)->index;
 477
 478	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 479		       FAN_DIV_FROM_REG(data->fan_div[nr])));
 480}
 481
 482static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
 483			    char *buf)
 484{
 485	struct lm87_data *data = lm87_update_device(dev);
 486	int nr = to_sensor_dev_attr(attr)->index;
 487
 488	return sprintf(buf, "%d\n",
 489		       FAN_DIV_FROM_REG(data->fan_div[nr]));
 490}
 491
 492static ssize_t fan_min_store(struct device *dev,
 493			     struct device_attribute *attr, const char *buf,
 494			     size_t count)
 495{
 496	struct i2c_client *client = dev_get_drvdata(dev);
 497	struct lm87_data *data = i2c_get_clientdata(client);
 498	int nr = to_sensor_dev_attr(attr)->index;
 499	long val;
 500	int err;
 501
 502	err = kstrtol(buf, 10, &val);
 503	if (err)
 504		return err;
 505
 506	mutex_lock(&data->update_lock);
 507	data->fan_min[nr] = FAN_TO_REG(val,
 508			    FAN_DIV_FROM_REG(data->fan_div[nr]));
 509	lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 510	mutex_unlock(&data->update_lock);
 511	return count;
 512}
 513
 514/*
 515 * Note: we save and restore the fan minimum here, because its value is
 516 * determined in part by the fan clock divider.  This follows the principle
 517 * of least surprise; the user doesn't expect the fan minimum to change just
 518 * because the divider changed.
 519 */
 520static ssize_t fan_div_store(struct device *dev,
 521			     struct device_attribute *attr, const char *buf,
 522			     size_t count)
 523{
 524	struct i2c_client *client = dev_get_drvdata(dev);
 525	struct lm87_data *data = i2c_get_clientdata(client);
 526	int nr = to_sensor_dev_attr(attr)->index;
 527	long val;
 528	int err;
 529	unsigned long min;
 530	u8 reg;
 531
 532	err = kstrtol(buf, 10, &val);
 533	if (err)
 534		return err;
 535
 536	mutex_lock(&data->update_lock);
 537	min = FAN_FROM_REG(data->fan_min[nr],
 538			   FAN_DIV_FROM_REG(data->fan_div[nr]));
 539
 540	switch (val) {
 541	case 1:
 542		data->fan_div[nr] = 0;
 543		break;
 544	case 2:
 545		data->fan_div[nr] = 1;
 546		break;
 547	case 4:
 548		data->fan_div[nr] = 2;
 549		break;
 550	case 8:
 551		data->fan_div[nr] = 3;
 552		break;
 553	default:
 554		mutex_unlock(&data->update_lock);
 555		return -EINVAL;
 556	}
 557
 558	reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 559	switch (nr) {
 560	case 0:
 561	    reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 562	    break;
 563	case 1:
 564	    reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 565	    break;
 566	}
 567	lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 568
 569	data->fan_min[nr] = FAN_TO_REG(min, val);
 570	lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 571			 data->fan_min[nr]);
 572	mutex_unlock(&data->update_lock);
 573
 574	return count;
 575}
 576
 577static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
 578static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
 579static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 580static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
 581static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
 582static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
 583
 584static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
 585			   char *buf)
 586{
 587	struct lm87_data *data = lm87_update_device(dev);
 588	return sprintf(buf, "%d\n", data->alarms);
 589}
 590static DEVICE_ATTR_RO(alarms);
 591
 592static ssize_t cpu0_vid_show(struct device *dev,
 593			     struct device_attribute *attr, char *buf)
 594{
 595	struct lm87_data *data = lm87_update_device(dev);
 596	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 597}
 598static DEVICE_ATTR_RO(cpu0_vid);
 599
 600static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
 601			char *buf)
 602{
 603	struct lm87_data *data = dev_get_drvdata(dev);
 604	return sprintf(buf, "%d\n", data->vrm);
 605}
 606static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
 607			 const char *buf, size_t count)
 608{
 609	struct lm87_data *data = dev_get_drvdata(dev);
 610	unsigned long val;
 611	int err;
 612
 613	err = kstrtoul(buf, 10, &val);
 614	if (err)
 615		return err;
 616
 617	if (val > 255)
 618		return -EINVAL;
 619
 620	data->vrm = val;
 621	return count;
 622}
 623static DEVICE_ATTR_RW(vrm);
 624
 625static ssize_t aout_output_show(struct device *dev,
 626				struct device_attribute *attr, char *buf)
 627{
 628	struct lm87_data *data = lm87_update_device(dev);
 629	return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 630}
 631static ssize_t aout_output_store(struct device *dev,
 632				 struct device_attribute *attr,
 633				 const char *buf, size_t count)
 634{
 635	struct i2c_client *client = dev_get_drvdata(dev);
 636	struct lm87_data *data = i2c_get_clientdata(client);
 637	long val;
 638	int err;
 639
 640	err = kstrtol(buf, 10, &val);
 641	if (err)
 642		return err;
 643
 644	mutex_lock(&data->update_lock);
 645	data->aout = AOUT_TO_REG(val);
 646	lm87_write_value(client, LM87_REG_AOUT, data->aout);
 647	mutex_unlock(&data->update_lock);
 648	return count;
 649}
 650static DEVICE_ATTR_RW(aout_output);
 651
 652static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 653			  char *buf)
 654{
 655	struct lm87_data *data = lm87_update_device(dev);
 656	int bitnr = to_sensor_dev_attr(attr)->index;
 657	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 658}
 659static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
 660static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
 661static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
 662static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
 663static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
 664static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
 665static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
 666static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
 667static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
 668static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
 669static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
 670static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
 671static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
 672static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
 673static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
 674
 675/*
 676 * Real code
 677 */
 678
 679static struct attribute *lm87_attributes[] = {
 680	&sensor_dev_attr_in1_input.dev_attr.attr,
 681	&sensor_dev_attr_in1_min.dev_attr.attr,
 682	&sensor_dev_attr_in1_max.dev_attr.attr,
 683	&sensor_dev_attr_in1_alarm.dev_attr.attr,
 684	&sensor_dev_attr_in2_input.dev_attr.attr,
 685	&sensor_dev_attr_in2_min.dev_attr.attr,
 686	&sensor_dev_attr_in2_max.dev_attr.attr,
 687	&sensor_dev_attr_in2_alarm.dev_attr.attr,
 688	&sensor_dev_attr_in3_input.dev_attr.attr,
 689	&sensor_dev_attr_in3_min.dev_attr.attr,
 690	&sensor_dev_attr_in3_max.dev_attr.attr,
 691	&sensor_dev_attr_in3_alarm.dev_attr.attr,
 692	&sensor_dev_attr_in4_input.dev_attr.attr,
 693	&sensor_dev_attr_in4_min.dev_attr.attr,
 694	&sensor_dev_attr_in4_max.dev_attr.attr,
 695	&sensor_dev_attr_in4_alarm.dev_attr.attr,
 696
 697	&sensor_dev_attr_temp1_input.dev_attr.attr,
 698	&sensor_dev_attr_temp1_max.dev_attr.attr,
 699	&sensor_dev_attr_temp1_min.dev_attr.attr,
 700	&dev_attr_temp1_crit.attr,
 701	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
 702	&sensor_dev_attr_temp2_input.dev_attr.attr,
 703	&sensor_dev_attr_temp2_max.dev_attr.attr,
 704	&sensor_dev_attr_temp2_min.dev_attr.attr,
 705	&dev_attr_temp2_crit.attr,
 706	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
 707	&sensor_dev_attr_temp2_fault.dev_attr.attr,
 708
 709	&dev_attr_alarms.attr,
 710	&dev_attr_aout_output.attr,
 711
 712	NULL
 713};
 714
 715static const struct attribute_group lm87_group = {
 716	.attrs = lm87_attributes,
 717};
 718
 719static struct attribute *lm87_attributes_in6[] = {
 720	&sensor_dev_attr_in6_input.dev_attr.attr,
 721	&sensor_dev_attr_in6_min.dev_attr.attr,
 722	&sensor_dev_attr_in6_max.dev_attr.attr,
 723	&sensor_dev_attr_in6_alarm.dev_attr.attr,
 724	NULL
 725};
 726
 727static const struct attribute_group lm87_group_in6 = {
 728	.attrs = lm87_attributes_in6,
 729};
 730
 731static struct attribute *lm87_attributes_fan1[] = {
 732	&sensor_dev_attr_fan1_input.dev_attr.attr,
 733	&sensor_dev_attr_fan1_min.dev_attr.attr,
 734	&sensor_dev_attr_fan1_div.dev_attr.attr,
 735	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
 736	NULL
 737};
 738
 739static const struct attribute_group lm87_group_fan1 = {
 740	.attrs = lm87_attributes_fan1,
 741};
 742
 743static struct attribute *lm87_attributes_in7[] = {
 744	&sensor_dev_attr_in7_input.dev_attr.attr,
 745	&sensor_dev_attr_in7_min.dev_attr.attr,
 746	&sensor_dev_attr_in7_max.dev_attr.attr,
 747	&sensor_dev_attr_in7_alarm.dev_attr.attr,
 748	NULL
 749};
 750
 751static const struct attribute_group lm87_group_in7 = {
 752	.attrs = lm87_attributes_in7,
 753};
 754
 755static struct attribute *lm87_attributes_fan2[] = {
 756	&sensor_dev_attr_fan2_input.dev_attr.attr,
 757	&sensor_dev_attr_fan2_min.dev_attr.attr,
 758	&sensor_dev_attr_fan2_div.dev_attr.attr,
 759	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
 760	NULL
 761};
 762
 763static const struct attribute_group lm87_group_fan2 = {
 764	.attrs = lm87_attributes_fan2,
 765};
 766
 767static struct attribute *lm87_attributes_temp3[] = {
 768	&sensor_dev_attr_temp3_input.dev_attr.attr,
 769	&sensor_dev_attr_temp3_max.dev_attr.attr,
 770	&sensor_dev_attr_temp3_min.dev_attr.attr,
 771	&dev_attr_temp3_crit.attr,
 772	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
 773	&sensor_dev_attr_temp3_fault.dev_attr.attr,
 774	NULL
 775};
 776
 777static const struct attribute_group lm87_group_temp3 = {
 778	.attrs = lm87_attributes_temp3,
 779};
 780
 781static struct attribute *lm87_attributes_in0_5[] = {
 782	&sensor_dev_attr_in0_input.dev_attr.attr,
 783	&sensor_dev_attr_in0_min.dev_attr.attr,
 784	&sensor_dev_attr_in0_max.dev_attr.attr,
 785	&sensor_dev_attr_in0_alarm.dev_attr.attr,
 786	&sensor_dev_attr_in5_input.dev_attr.attr,
 787	&sensor_dev_attr_in5_min.dev_attr.attr,
 788	&sensor_dev_attr_in5_max.dev_attr.attr,
 789	&sensor_dev_attr_in5_alarm.dev_attr.attr,
 790	NULL
 791};
 792
 793static const struct attribute_group lm87_group_in0_5 = {
 794	.attrs = lm87_attributes_in0_5,
 795};
 796
 797static struct attribute *lm87_attributes_vid[] = {
 798	&dev_attr_cpu0_vid.attr,
 799	&dev_attr_vrm.attr,
 800	NULL
 801};
 802
 803static const struct attribute_group lm87_group_vid = {
 804	.attrs = lm87_attributes_vid,
 805};
 806
 807/* Return 0 if detection is successful, -ENODEV otherwise */
 808static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
 809{
 810	struct i2c_adapter *adapter = client->adapter;
 811	const char *name;
 812	u8 cid, rev;
 813
 814	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 815		return -ENODEV;
 816
 817	if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
 818		return -ENODEV;
 819
 820	/* Now, we do the remaining detection. */
 821	cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
 822	rev = lm87_read_value(client, LM87_REG_REVISION);
 823
 824	if (cid == 0x02			/* National Semiconductor */
 825	 && (rev >= 0x01 && rev <= 0x08))
 826		name = "lm87";
 827	else if (cid == 0x41		/* Analog Devices */
 828	      && (rev & 0xf0) == 0x10)
 829		name = "adm1024";
 830	else {
 831		dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
 832			client->addr);
 833		return -ENODEV;
 834	}
 835
 836	strlcpy(info->type, name, I2C_NAME_SIZE);
 837
 838	return 0;
 839}
 840
 841static void lm87_restore_config(void *arg)
 842{
 843	struct i2c_client *client = arg;
 844	struct lm87_data *data = i2c_get_clientdata(client);
 845
 846	lm87_write_value(client, LM87_REG_CONFIG, data->config);
 847}
 848
 849static int lm87_init_client(struct i2c_client *client)
 850{
 851	struct lm87_data *data = i2c_get_clientdata(client);
 852	int rc;
 853	struct device_node *of_node = client->dev.of_node;
 854	u8 val = 0;
 855	struct regulator *vcc = NULL;
 856
 857	if (of_node) {
 858		if (of_property_read_bool(of_node, "has-temp3"))
 859			val |= CHAN_TEMP3;
 860		if (of_property_read_bool(of_node, "has-in6"))
 861			val |= CHAN_NO_FAN(0);
 862		if (of_property_read_bool(of_node, "has-in7"))
 863			val |= CHAN_NO_FAN(1);
 864		vcc = devm_regulator_get_optional(&client->dev, "vcc");
 865		if (!IS_ERR(vcc)) {
 866			if (regulator_get_voltage(vcc) == 5000000)
 867				val |= CHAN_VCC_5V;
 868		}
 869		data->channel = val;
 870		lm87_write_value(client,
 871				LM87_REG_CHANNEL_MODE, data->channel);
 872	} else if (dev_get_platdata(&client->dev)) {
 873		data->channel = *(u8 *)dev_get_platdata(&client->dev);
 874		lm87_write_value(client,
 875				 LM87_REG_CHANNEL_MODE, data->channel);
 876	} else {
 877		data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 878	}
 879	data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 880
 881	rc = devm_add_action(&client->dev, lm87_restore_config, client);
 882	if (rc)
 883		return rc;
 884
 885	if (!(data->config & 0x01)) {
 886		int i;
 887
 888		/* Limits are left uninitialized after power-up */
 889		for (i = 1; i < 6; i++) {
 890			lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 891			lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 892		}
 893		for (i = 0; i < 2; i++) {
 894			lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 895			lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 896			lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 897			lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 898		}
 899		if (data->channel & CHAN_TEMP3) {
 900			lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 901			lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 902		} else {
 903			lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 904			lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 905		}
 906	}
 907
 908	/* Make sure Start is set and INT#_Clear is clear */
 909	if ((data->config & 0x09) != 0x01)
 910		lm87_write_value(client, LM87_REG_CONFIG,
 911				 (data->config & 0x77) | 0x01);
 912	return 0;
 913}
 914
 915static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
 916{
 917	struct lm87_data *data;
 918	struct device *hwmon_dev;
 919	int err;
 920	unsigned int group_tail = 0;
 921
 922	data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
 923	if (!data)
 924		return -ENOMEM;
 925
 926	i2c_set_clientdata(client, data);
 927	mutex_init(&data->update_lock);
 928
 929	/* Initialize the LM87 chip */
 930	err = lm87_init_client(client);
 931	if (err)
 932		return err;
 933
 934	data->in_scale[0] = 2500;
 935	data->in_scale[1] = 2700;
 936	data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 937	data->in_scale[3] = 5000;
 938	data->in_scale[4] = 12000;
 939	data->in_scale[5] = 2700;
 940	data->in_scale[6] = 1875;
 941	data->in_scale[7] = 1875;
 942
 943	/*
 944	 * Construct the list of attributes, the list depends on the
 945	 * configuration of the chip
 946	 */
 947	data->attr_groups[group_tail++] = &lm87_group;
 948	if (data->channel & CHAN_NO_FAN(0))
 949		data->attr_groups[group_tail++] = &lm87_group_in6;
 950	else
 951		data->attr_groups[group_tail++] = &lm87_group_fan1;
 952
 953	if (data->channel & CHAN_NO_FAN(1))
 954		data->attr_groups[group_tail++] = &lm87_group_in7;
 955	else
 956		data->attr_groups[group_tail++] = &lm87_group_fan2;
 957
 958	if (data->channel & CHAN_TEMP3)
 959		data->attr_groups[group_tail++] = &lm87_group_temp3;
 960	else
 961		data->attr_groups[group_tail++] = &lm87_group_in0_5;
 962
 963	if (!(data->channel & CHAN_NO_VID)) {
 964		data->vrm = vid_which_vrm();
 965		data->attr_groups[group_tail++] = &lm87_group_vid;
 966	}
 967
 968	hwmon_dev = devm_hwmon_device_register_with_groups(
 969	    &client->dev, client->name, client, data->attr_groups);
 970	return PTR_ERR_OR_ZERO(hwmon_dev);
 971}
 972
 973/*
 974 * Driver data (common to all clients)
 975 */
 976
 977static const struct i2c_device_id lm87_id[] = {
 978	{ "lm87", 0 },
 979	{ "adm1024", 0 },
 980	{ }
 981};
 982MODULE_DEVICE_TABLE(i2c, lm87_id);
 983
 984static const struct of_device_id lm87_of_match[] = {
 985	{ .compatible = "ti,lm87" },
 986	{ .compatible = "adi,adm1024" },
 987	{ },
 988};
 989MODULE_DEVICE_TABLE(of, lm87_of_match);
 990
 991static struct i2c_driver lm87_driver = {
 992	.class		= I2C_CLASS_HWMON,
 993	.driver = {
 994		.name	= "lm87",
 995		.of_match_table = lm87_of_match,
 996	},
 997	.probe		= lm87_probe,
 998	.id_table	= lm87_id,
 999	.detect		= lm87_detect,
1000	.address_list	= normal_i2c,
1001};
1002
1003module_i2c_driver(lm87_driver);
1004
1005MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1006MODULE_DESCRIPTION("LM87 driver");
1007MODULE_LICENSE("GPL");