1/*
   2 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
   3 *          monitoring
   4 * Copyright (C) 2003-2010  Jean Delvare <jdelvare@suse.de>
   5 *
   6 * Based on the lm83 driver. The LM90 is a sensor chip made by National
   7 * Semiconductor. It reports up to two temperatures (its own plus up to
   8 * one external one) with a 0.125 deg resolution (1 deg for local
   9 * temperature) and a 3-4 deg accuracy.
  10 *
  11 * This driver also supports the LM89 and LM99, two other sensor chips
  12 * made by National Semiconductor. Both have an increased remote
  13 * temperature measurement accuracy (1 degree), and the LM99
  14 * additionally shifts remote temperatures (measured and limits) by 16
  15 * degrees, which allows for higher temperatures measurement.
  16 * Note that there is no way to differentiate between both chips.
  17 * When device is auto-detected, the driver will assume an LM99.
  18 *
  19 * This driver also supports the LM86, another sensor chip made by
  20 * National Semiconductor. It is exactly similar to the LM90 except it
  21 * has a higher accuracy.
  22 *
  23 * This driver also supports the ADM1032, a sensor chip made by Analog
  24 * Devices. That chip is similar to the LM90, with a few differences
  25 * that are not handled by this driver. Among others, it has a higher
  26 * accuracy than the LM90, much like the LM86 does.
  27 *
  28 * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
  29 * chips made by Maxim. These chips are similar to the LM86.
  30 * Note that there is no easy way to differentiate between the three
  31 * variants. We use the device address to detect MAX6659, which will result
  32 * in a detection as max6657 if it is on address 0x4c. The extra address
  33 * and features of the MAX6659 are only supported if the chip is configured
  34 * explicitly as max6659, or if its address is not 0x4c.
  35 * These chips lack the remote temperature offset feature.
  36 *
  37 * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
  38 * MAX6692 chips made by Maxim.  These are again similar to the LM86,
  39 * but they use unsigned temperature values and can report temperatures
  40 * from 0 to 145 degrees.
  41 *
  42 * This driver also supports the MAX6680 and MAX6681, two other sensor
  43 * chips made by Maxim. These are quite similar to the other Maxim
  44 * chips. The MAX6680 and MAX6681 only differ in the pinout so they can
  45 * be treated identically.
  46 *
  47 * This driver also supports the MAX6695 and MAX6696, two other sensor
  48 * chips made by Maxim. These are also quite similar to other Maxim
  49 * chips, but support three temperature sensors instead of two. MAX6695
  50 * and MAX6696 only differ in the pinout so they can be treated identically.
  51 *
  52 * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
  53 * NCT1008 from ON Semiconductor. The chips are supported in both compatibility
  54 * and extended mode. They are mostly compatible with LM90 except for a data
  55 * format difference for the temperature value registers.
  56 *
  57 * This driver also supports the SA56004 from Philips. This device is
  58 * pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
  59 *
  60 * This driver also supports the G781 from GMT. This device is compatible
  61 * with the ADM1032.
  62 *
  63 * This driver also supports TMP451 from Texas Instruments. This device is
  64 * supported in both compatibility and extended mode. It's mostly compatible
  65 * with ADT7461 except for local temperature low byte register and max
  66 * conversion rate.
  67 *
  68 * Since the LM90 was the first chipset supported by this driver, most
  69 * comments will refer to this chipset, but are actually general and
  70 * concern all supported chipsets, unless mentioned otherwise.
  71 *
  72 * This program is free software; you can redistribute it and/or modify
  73 * it under the terms of the GNU General Public License as published by
  74 * the Free Software Foundation; either version 2 of the License, or
  75 * (at your option) any later version.
  76 *
  77 * This program is distributed in the hope that it will be useful,
  78 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  79 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  80 * GNU General Public License for more details.
  81 *
  82 * You should have received a copy of the GNU General Public License
  83 * along with this program; if not, write to the Free Software
  84 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  85 */
  86
  87#include <linux/module.h>
  88#include <linux/init.h>
  89#include <linux/slab.h>
  90#include <linux/jiffies.h>
  91#include <linux/i2c.h>
  92#include <linux/hwmon-sysfs.h>
  93#include <linux/hwmon.h>
  94#include <linux/err.h>
  95#include <linux/mutex.h>
  96#include <linux/sysfs.h>
  97#include <linux/interrupt.h>
  98#include <linux/regulator/consumer.h>
  99
 100/*
 101 * Addresses to scan
 102 * Address is fully defined internally and cannot be changed except for
 103 * MAX6659, MAX6680 and MAX6681.
 104 * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
 105 * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
 106 * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
 107 * have address 0x4d.
 108 * MAX6647 has address 0x4e.
 109 * MAX6659 can have address 0x4c, 0x4d or 0x4e.
 110 * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
 111 * 0x4c, 0x4d or 0x4e.
 112 * SA56004 can have address 0x48 through 0x4F.
 113 */
 114
 115static const unsigned short normal_i2c[] = {
 116	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
 117	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
 118
 119enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
 120	max6646, w83l771, max6696, sa56004, g781, tmp451 };
 121
 122/*
 123 * The LM90 registers
 124 */
 125
 126#define LM90_REG_R_MAN_ID		0xFE
 127#define LM90_REG_R_CHIP_ID		0xFF
 128#define LM90_REG_R_CONFIG1		0x03
 129#define LM90_REG_W_CONFIG1		0x09
 130#define LM90_REG_R_CONFIG2		0xBF
 131#define LM90_REG_W_CONFIG2		0xBF
 132#define LM90_REG_R_CONVRATE		0x04
 133#define LM90_REG_W_CONVRATE		0x0A
 134#define LM90_REG_R_STATUS		0x02
 135#define LM90_REG_R_LOCAL_TEMP		0x00
 136#define LM90_REG_R_LOCAL_HIGH		0x05
 137#define LM90_REG_W_LOCAL_HIGH		0x0B
 138#define LM90_REG_R_LOCAL_LOW		0x06
 139#define LM90_REG_W_LOCAL_LOW		0x0C
 140#define LM90_REG_R_LOCAL_CRIT		0x20
 141#define LM90_REG_W_LOCAL_CRIT		0x20
 142#define LM90_REG_R_REMOTE_TEMPH		0x01
 143#define LM90_REG_R_REMOTE_TEMPL		0x10
 144#define LM90_REG_R_REMOTE_OFFSH		0x11
 145#define LM90_REG_W_REMOTE_OFFSH		0x11
 146#define LM90_REG_R_REMOTE_OFFSL		0x12
 147#define LM90_REG_W_REMOTE_OFFSL		0x12
 148#define LM90_REG_R_REMOTE_HIGHH		0x07
 149#define LM90_REG_W_REMOTE_HIGHH		0x0D
 150#define LM90_REG_R_REMOTE_HIGHL		0x13
 151#define LM90_REG_W_REMOTE_HIGHL		0x13
 152#define LM90_REG_R_REMOTE_LOWH		0x08
 153#define LM90_REG_W_REMOTE_LOWH		0x0E
 154#define LM90_REG_R_REMOTE_LOWL		0x14
 155#define LM90_REG_W_REMOTE_LOWL		0x14
 156#define LM90_REG_R_REMOTE_CRIT		0x19
 157#define LM90_REG_W_REMOTE_CRIT		0x19
 158#define LM90_REG_R_TCRIT_HYST		0x21
 159#define LM90_REG_W_TCRIT_HYST		0x21
 160
 161/* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
 162
 163#define MAX6657_REG_R_LOCAL_TEMPL	0x11
 164#define MAX6696_REG_R_STATUS2		0x12
 165#define MAX6659_REG_R_REMOTE_EMERG	0x16
 166#define MAX6659_REG_W_REMOTE_EMERG	0x16
 167#define MAX6659_REG_R_LOCAL_EMERG	0x17
 168#define MAX6659_REG_W_LOCAL_EMERG	0x17
 169
 170/*  SA56004 registers */
 171
 172#define SA56004_REG_R_LOCAL_TEMPL 0x22
 173
 174#define LM90_DEF_CONVRATE_RVAL	6	/* Def conversion rate register value */
 175#define LM90_MAX_CONVRATE_MS	16000	/* Maximum conversion rate in ms */
 176
 177/* TMP451 registers */
 178#define TMP451_REG_R_LOCAL_TEMPL	0x15
 179
 180/*
 181 * Device flags
 182 */
 183#define LM90_FLAG_ADT7461_EXT	(1 << 0) /* ADT7461 extended mode	*/
 184/* Device features */
 185#define LM90_HAVE_OFFSET	(1 << 1) /* temperature offset register	*/
 186#define LM90_HAVE_REM_LIMIT_EXT	(1 << 3) /* extended remote limit	*/
 187#define LM90_HAVE_EMERGENCY	(1 << 4) /* 3rd upper (emergency) limit	*/
 188#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm		*/
 189#define LM90_HAVE_TEMP3		(1 << 6) /* 3rd temperature sensor	*/
 190#define LM90_HAVE_BROKEN_ALERT	(1 << 7) /* Broken alert		*/
 191
 192/* LM90 status */
 193#define LM90_STATUS_LTHRM	(1 << 0) /* local THERM limit tripped */
 194#define LM90_STATUS_RTHRM	(1 << 1) /* remote THERM limit tripped */
 195#define LM90_STATUS_ROPEN	(1 << 2) /* remote is an open circuit */
 196#define LM90_STATUS_RLOW	(1 << 3) /* remote low temp limit tripped */
 197#define LM90_STATUS_RHIGH	(1 << 4) /* remote high temp limit tripped */
 198#define LM90_STATUS_LLOW	(1 << 5) /* local low temp limit tripped */
 199#define LM90_STATUS_LHIGH	(1 << 6) /* local high temp limit tripped */
 200
 201#define MAX6696_STATUS2_R2THRM	(1 << 1) /* remote2 THERM limit tripped */
 202#define MAX6696_STATUS2_R2OPEN	(1 << 2) /* remote2 is an open circuit */
 203#define MAX6696_STATUS2_R2LOW	(1 << 3) /* remote2 low temp limit tripped */
 204#define MAX6696_STATUS2_R2HIGH	(1 << 4) /* remote2 high temp limit tripped */
 205#define MAX6696_STATUS2_ROT2	(1 << 5) /* remote emergency limit tripped */
 206#define MAX6696_STATUS2_R2OT2	(1 << 6) /* remote2 emergency limit tripped */
 207#define MAX6696_STATUS2_LOT2	(1 << 7) /* local emergency limit tripped */
 208
 209/*
 210 * Driver data (common to all clients)
 211 */
 212
 213static const struct i2c_device_id lm90_id[] = {
 214	{ "adm1032", adm1032 },
 215	{ "adt7461", adt7461 },
 216	{ "adt7461a", adt7461 },
 217	{ "g781", g781 },
 218	{ "lm90", lm90 },
 219	{ "lm86", lm86 },
 220	{ "lm89", lm86 },
 221	{ "lm99", lm99 },
 222	{ "max6646", max6646 },
 223	{ "max6647", max6646 },
 224	{ "max6649", max6646 },
 225	{ "max6657", max6657 },
 226	{ "max6658", max6657 },
 227	{ "max6659", max6659 },
 228	{ "max6680", max6680 },
 229	{ "max6681", max6680 },
 230	{ "max6695", max6696 },
 231	{ "max6696", max6696 },
 232	{ "nct1008", adt7461 },
 233	{ "w83l771", w83l771 },
 234	{ "sa56004", sa56004 },
 235	{ "tmp451", tmp451 },
 236	{ }
 237};
 238MODULE_DEVICE_TABLE(i2c, lm90_id);
 239
 240/*
 241 * chip type specific parameters
 242 */
 243struct lm90_params {
 244	u32 flags;		/* Capabilities */
 245	u16 alert_alarms;	/* Which alarm bits trigger ALERT# */
 246				/* Upper 8 bits for max6695/96 */
 247	u8 max_convrate;	/* Maximum conversion rate register value */
 248	u8 reg_local_ext;	/* Extended local temp register (optional) */
 249};
 250
 251static const struct lm90_params lm90_params[] = {
 252	[adm1032] = {
 253		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 254		  | LM90_HAVE_BROKEN_ALERT,
 255		.alert_alarms = 0x7c,
 256		.max_convrate = 10,
 257	},
 258	[adt7461] = {
 259		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 260		  | LM90_HAVE_BROKEN_ALERT,
 261		.alert_alarms = 0x7c,
 262		.max_convrate = 10,
 263	},
 264	[g781] = {
 265		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 266		  | LM90_HAVE_BROKEN_ALERT,
 267		.alert_alarms = 0x7c,
 268		.max_convrate = 8,
 269	},
 270	[lm86] = {
 271		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 272		.alert_alarms = 0x7b,
 273		.max_convrate = 9,
 274	},
 275	[lm90] = {
 276		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 277		.alert_alarms = 0x7b,
 278		.max_convrate = 9,
 279	},
 280	[lm99] = {
 281		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 282		.alert_alarms = 0x7b,
 283		.max_convrate = 9,
 284	},
 285	[max6646] = {
 286		.alert_alarms = 0x7c,
 287		.max_convrate = 6,
 288		.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 289	},
 290	[max6657] = {
 291		.alert_alarms = 0x7c,
 292		.max_convrate = 8,
 293		.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 294	},
 295	[max6659] = {
 296		.flags = LM90_HAVE_EMERGENCY,
 297		.alert_alarms = 0x7c,
 298		.max_convrate = 8,
 299		.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 300	},
 301	[max6680] = {
 302		.flags = LM90_HAVE_OFFSET,
 303		.alert_alarms = 0x7c,
 304		.max_convrate = 7,
 305	},
 306	[max6696] = {
 307		.flags = LM90_HAVE_EMERGENCY
 308		  | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
 309		.alert_alarms = 0x1c7c,
 310		.max_convrate = 6,
 311		.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 312	},
 313	[w83l771] = {
 314		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 315		.alert_alarms = 0x7c,
 316		.max_convrate = 8,
 317	},
 318	[sa56004] = {
 319		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 320		.alert_alarms = 0x7b,
 321		.max_convrate = 9,
 322		.reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
 323	},
 324	[tmp451] = {
 325		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 326		  | LM90_HAVE_BROKEN_ALERT,
 327		.alert_alarms = 0x7c,
 328		.max_convrate = 9,
 329		.reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
 330	}
 331};
 332
 333/*
 334 * TEMP8 register index
 335 */
 336enum lm90_temp8_reg_index {
 337	LOCAL_LOW = 0,
 338	LOCAL_HIGH,
 339	LOCAL_CRIT,
 340	REMOTE_CRIT,
 341	LOCAL_EMERG,	/* max6659 and max6695/96 */
 342	REMOTE_EMERG,	/* max6659 and max6695/96 */
 343	REMOTE2_CRIT,	/* max6695/96 only */
 344	REMOTE2_EMERG,	/* max6695/96 only */
 345	TEMP8_REG_NUM
 346};
 347
 348/*
 349 * TEMP11 register index
 350 */
 351enum lm90_temp11_reg_index {
 352	REMOTE_TEMP = 0,
 353	REMOTE_LOW,
 354	REMOTE_HIGH,
 355	REMOTE_OFFSET,	/* except max6646, max6657/58/59, and max6695/96 */
 356	LOCAL_TEMP,
 357	REMOTE2_TEMP,	/* max6695/96 only */
 358	REMOTE2_LOW,	/* max6695/96 only */
 359	REMOTE2_HIGH,	/* max6695/96 only */
 360	TEMP11_REG_NUM
 361};
 362
 363/*
 364 * Client data (each client gets its own)
 365 */
 366
 367struct lm90_data {
 368	struct i2c_client *client;
 369	struct device *hwmon_dev;
 370	const struct attribute_group *groups[6];
 371	struct mutex update_lock;
 372	struct regulator *regulator;
 373	char valid; /* zero until following fields are valid */
 374	unsigned long last_updated; /* in jiffies */
 375	int kind;
 376	u32 flags;
 377
 378	int update_interval;	/* in milliseconds */
 379
 380	u8 config_orig;		/* Original configuration register value */
 381	u8 convrate_orig;	/* Original conversion rate register value */
 382	u16 alert_alarms;	/* Which alarm bits trigger ALERT# */
 383				/* Upper 8 bits for max6695/96 */
 384	u8 max_convrate;	/* Maximum conversion rate */
 385	u8 reg_local_ext;	/* local extension register offset */
 386
 387	/* registers values */
 388	s8 temp8[TEMP8_REG_NUM];
 389	s16 temp11[TEMP11_REG_NUM];
 390	u8 temp_hyst;
 391	u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
 392};
 393
 394/*
 395 * Support functions
 396 */
 397
 398/*
 399 * The ADM1032 supports PEC but not on write byte transactions, so we need
 400 * to explicitly ask for a transaction without PEC.
 401 */
 402static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
 403{
 404	return i2c_smbus_xfer(client->adapter, client->addr,
 405			      client->flags & ~I2C_CLIENT_PEC,
 406			      I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
 407}
 408
 409/*
 410 * It is assumed that client->update_lock is held (unless we are in
 411 * detection or initialization steps). This matters when PEC is enabled,
 412 * because we don't want the address pointer to change between the write
 413 * byte and the read byte transactions.
 414 */
 415static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
 416{
 417	int err;
 418
 419	if (client->flags & I2C_CLIENT_PEC) {
 420		err = adm1032_write_byte(client, reg);
 421		if (err >= 0)
 422			err = i2c_smbus_read_byte(client);
 423	} else
 424		err = i2c_smbus_read_byte_data(client, reg);
 425
 426	if (err < 0) {
 427		dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
 428			 reg, err);
 429		return err;
 430	}
 431	*value = err;
 432
 433	return 0;
 434}
 435
 436static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
 437{
 438	int err;
 439	u8 oldh, newh, l;
 440
 441	/*
 442	 * There is a trick here. We have to read two registers to have the
 443	 * sensor temperature, but we have to beware a conversion could occur
 444	 * between the readings. The datasheet says we should either use
 445	 * the one-shot conversion register, which we don't want to do
 446	 * (disables hardware monitoring) or monitor the busy bit, which is
 447	 * impossible (we can't read the values and monitor that bit at the
 448	 * exact same time). So the solution used here is to read the high
 449	 * byte once, then the low byte, then the high byte again. If the new
 450	 * high byte matches the old one, then we have a valid reading. Else
 451	 * we have to read the low byte again, and now we believe we have a
 452	 * correct reading.
 453	 */
 454	if ((err = lm90_read_reg(client, regh, &oldh))
 455	 || (err = lm90_read_reg(client, regl, &l))
 456	 || (err = lm90_read_reg(client, regh, &newh)))
 457		return err;
 458	if (oldh != newh) {
 459		err = lm90_read_reg(client, regl, &l);
 460		if (err)
 461			return err;
 462	}
 463	*value = (newh << 8) | l;
 464
 465	return 0;
 466}
 467
 468/*
 469 * client->update_lock must be held when calling this function (unless we are
 470 * in detection or initialization steps), and while a remote channel other
 471 * than channel 0 is selected. Also, calling code must make sure to re-select
 472 * external channel 0 before releasing the lock. This is necessary because
 473 * various registers have different meanings as a result of selecting a
 474 * non-default remote channel.
 475 */
 476static inline void lm90_select_remote_channel(struct i2c_client *client,
 477					      struct lm90_data *data,
 478					      int channel)
 479{
 480	u8 config;
 481
 482	if (data->kind == max6696) {
 483		lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
 484		config &= ~0x08;
 485		if (channel)
 486			config |= 0x08;
 487		i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
 488					  config);
 489	}
 490}
 491
 492/*
 493 * Set conversion rate.
 494 * client->update_lock must be held when calling this function (unless we are
 495 * in detection or initialization steps).
 496 */
 497static void lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
 498			      unsigned int interval)
 499{
 500	int i;
 501	unsigned int update_interval;
 502
 503	/* Shift calculations to avoid rounding errors */
 504	interval <<= 6;
 505
 506	/* find the nearest update rate */
 507	for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
 508	     i < data->max_convrate; i++, update_interval >>= 1)
 509		if (interval >= update_interval * 3 / 4)
 510			break;
 511
 512	i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i);
 513	data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
 514}
 515
 516static struct lm90_data *lm90_update_device(struct device *dev)
 517{
 518	struct lm90_data *data = dev_get_drvdata(dev);
 519	struct i2c_client *client = data->client;
 520	unsigned long next_update;
 521
 522	mutex_lock(&data->update_lock);
 523
 524	next_update = data->last_updated +
 525		      msecs_to_jiffies(data->update_interval);
 526	if (time_after(jiffies, next_update) || !data->valid) {
 527		u8 h, l;
 528		u8 alarms;
 529
 530		dev_dbg(&client->dev, "Updating lm90 data.\n");
 531		lm90_read_reg(client, LM90_REG_R_LOCAL_LOW,
 532			      &data->temp8[LOCAL_LOW]);
 533		lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH,
 534			      &data->temp8[LOCAL_HIGH]);
 535		lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT,
 536			      &data->temp8[LOCAL_CRIT]);
 537		lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
 538			      &data->temp8[REMOTE_CRIT]);
 539		lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
 540
 541		if (data->reg_local_ext) {
 542			lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
 543				    data->reg_local_ext,
 544				    &data->temp11[LOCAL_TEMP]);
 545		} else {
 546			if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
 547					  &h) == 0)
 548				data->temp11[LOCAL_TEMP] = h << 8;
 549		}
 550		lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
 551			    LM90_REG_R_REMOTE_TEMPL,
 552			    &data->temp11[REMOTE_TEMP]);
 553
 554		if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
 555			data->temp11[REMOTE_LOW] = h << 8;
 556			if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
 557			 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
 558					  &l) == 0)
 559				data->temp11[REMOTE_LOW] |= l;
 560		}
 561		if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
 562			data->temp11[REMOTE_HIGH] = h << 8;
 563			if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
 564			 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
 565					  &l) == 0)
 566				data->temp11[REMOTE_HIGH] |= l;
 567		}
 568
 569		if (data->flags & LM90_HAVE_OFFSET) {
 570			if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
 571					  &h) == 0
 572			 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
 573					  &l) == 0)
 574				data->temp11[REMOTE_OFFSET] = (h << 8) | l;
 575		}
 576		if (data->flags & LM90_HAVE_EMERGENCY) {
 577			lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
 578				      &data->temp8[LOCAL_EMERG]);
 579			lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
 580				      &data->temp8[REMOTE_EMERG]);
 581		}
 582		lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
 583		data->alarms = alarms;	/* save as 16 bit value */
 584
 585		if (data->kind == max6696) {
 586			lm90_select_remote_channel(client, data, 1);
 587			lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
 588				      &data->temp8[REMOTE2_CRIT]);
 589			lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
 590				      &data->temp8[REMOTE2_EMERG]);
 591			lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
 592				    LM90_REG_R_REMOTE_TEMPL,
 593				    &data->temp11[REMOTE2_TEMP]);
 594			if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
 595				data->temp11[REMOTE2_LOW] = h << 8;
 596			if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
 597				data->temp11[REMOTE2_HIGH] = h << 8;
 598			lm90_select_remote_channel(client, data, 0);
 599
 600			if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
 601					   &alarms))
 602				data->alarms |= alarms << 8;
 603		}
 604
 605		/*
 606		 * Re-enable ALERT# output if it was originally enabled and
 607		 * relevant alarms are all clear
 608		 */
 609		if ((data->config_orig & 0x80) == 0
 610		 && (data->alarms & data->alert_alarms) == 0) {
 611			u8 config;
 612
 613			lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
 614			if (config & 0x80) {
 615				dev_dbg(&client->dev, "Re-enabling ALERT#\n");
 616				i2c_smbus_write_byte_data(client,
 617							  LM90_REG_W_CONFIG1,
 618							  config & ~0x80);
 619			}
 620		}
 621
 622		data->last_updated = jiffies;
 623		data->valid = 1;
 624	}
 625
 626	mutex_unlock(&data->update_lock);
 627
 628	return data;
 629}
 630
 631/*
 632 * Conversions
 633 * For local temperatures and limits, critical limits and the hysteresis
 634 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
 635 * For remote temperatures and limits, it uses signed 11-bit values with
 636 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.  Some
 637 * Maxim chips use unsigned values.
 638 */
 639
 640static inline int temp_from_s8(s8 val)
 641{
 642	return val * 1000;
 643}
 644
 645static inline int temp_from_u8(u8 val)
 646{
 647	return val * 1000;
 648}
 649
 650static inline int temp_from_s16(s16 val)
 651{
 652	return val / 32 * 125;
 653}
 654
 655static inline int temp_from_u16(u16 val)
 656{
 657	return val / 32 * 125;
 658}
 659
 660static s8 temp_to_s8(long val)
 661{
 662	if (val <= -128000)
 663		return -128;
 664	if (val >= 127000)
 665		return 127;
 666	if (val < 0)
 667		return (val - 500) / 1000;
 668	return (val + 500) / 1000;
 669}
 670
 671static u8 temp_to_u8(long val)
 672{
 673	if (val <= 0)
 674		return 0;
 675	if (val >= 255000)
 676		return 255;
 677	return (val + 500) / 1000;
 678}
 679
 680static s16 temp_to_s16(long val)
 681{
 682	if (val <= -128000)
 683		return 0x8000;
 684	if (val >= 127875)
 685		return 0x7FE0;
 686	if (val < 0)
 687		return (val - 62) / 125 * 32;
 688	return (val + 62) / 125 * 32;
 689}
 690
 691static u8 hyst_to_reg(long val)
 692{
 693	if (val <= 0)
 694		return 0;
 695	if (val >= 30500)
 696		return 31;
 697	return (val + 500) / 1000;
 698}
 699
 700/*
 701 * ADT7461 in compatibility mode is almost identical to LM90 except that
 702 * attempts to write values that are outside the range 0 < temp < 127 are
 703 * treated as the boundary value.
 704 *
 705 * ADT7461 in "extended mode" operation uses unsigned integers offset by
 706 * 64 (e.g., 0 -> -64 degC).  The range is restricted to -64..191 degC.
 707 */
 708static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
 709{
 710	if (data->flags & LM90_FLAG_ADT7461_EXT)
 711		return (val - 64) * 1000;
 712	else
 713		return temp_from_s8(val);
 714}
 715
 716static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
 717{
 718	if (data->flags & LM90_FLAG_ADT7461_EXT)
 719		return (val - 0x4000) / 64 * 250;
 720	else
 721		return temp_from_s16(val);
 722}
 723
 724static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
 725{
 726	if (data->flags & LM90_FLAG_ADT7461_EXT) {
 727		if (val <= -64000)
 728			return 0;
 729		if (val >= 191000)
 730			return 0xFF;
 731		return (val + 500 + 64000) / 1000;
 732	} else {
 733		if (val <= 0)
 734			return 0;
 735		if (val >= 127000)
 736			return 127;
 737		return (val + 500) / 1000;
 738	}
 739}
 740
 741static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
 742{
 743	if (data->flags & LM90_FLAG_ADT7461_EXT) {
 744		if (val <= -64000)
 745			return 0;
 746		if (val >= 191750)
 747			return 0xFFC0;
 748		return (val + 64000 + 125) / 250 * 64;
 749	} else {
 750		if (val <= 0)
 751			return 0;
 752		if (val >= 127750)
 753			return 0x7FC0;
 754		return (val + 125) / 250 * 64;
 755	}
 756}
 757
 758/*
 759 * Sysfs stuff
 760 */
 761
 762static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
 763			  char *buf)
 764{
 765	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 766	struct lm90_data *data = lm90_update_device(dev);
 767	int temp;
 768
 769	if (data->kind == adt7461 || data->kind == tmp451)
 770		temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
 771	else if (data->kind == max6646)
 772		temp = temp_from_u8(data->temp8[attr->index]);
 773	else
 774		temp = temp_from_s8(data->temp8[attr->index]);
 775
 776	/* +16 degrees offset for temp2 for the LM99 */
 777	if (data->kind == lm99 && attr->index == 3)
 778		temp += 16000;
 779
 780	return sprintf(buf, "%d\n", temp);
 781}
 782
 783static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
 784			 const char *buf, size_t count)
 785{
 786	static const u8 reg[TEMP8_REG_NUM] = {
 787		LM90_REG_W_LOCAL_LOW,
 788		LM90_REG_W_LOCAL_HIGH,
 789		LM90_REG_W_LOCAL_CRIT,
 790		LM90_REG_W_REMOTE_CRIT,
 791		MAX6659_REG_W_LOCAL_EMERG,
 792		MAX6659_REG_W_REMOTE_EMERG,
 793		LM90_REG_W_REMOTE_CRIT,
 794		MAX6659_REG_W_REMOTE_EMERG,
 795	};
 796
 797	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 798	struct lm90_data *data = dev_get_drvdata(dev);
 799	struct i2c_client *client = data->client;
 800	int nr = attr->index;
 801	long val;
 802	int err;
 803
 804	err = kstrtol(buf, 10, &val);
 805	if (err < 0)
 806		return err;
 807
 808	/* +16 degrees offset for temp2 for the LM99 */
 809	if (data->kind == lm99 && attr->index == 3)
 810		val -= 16000;
 811
 812	mutex_lock(&data->update_lock);
 813	if (data->kind == adt7461 || data->kind == tmp451)
 814		data->temp8[nr] = temp_to_u8_adt7461(data, val);
 815	else if (data->kind == max6646)
 816		data->temp8[nr] = temp_to_u8(val);
 817	else
 818		data->temp8[nr] = temp_to_s8(val);
 819
 820	lm90_select_remote_channel(client, data, nr >= 6);
 821	i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
 822	lm90_select_remote_channel(client, data, 0);
 823
 824	mutex_unlock(&data->update_lock);
 825	return count;
 826}
 827
 828static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
 829			   char *buf)
 830{
 831	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
 832	struct lm90_data *data = lm90_update_device(dev);
 833	int temp;
 834
 835	if (data->kind == adt7461 || data->kind == tmp451)
 836		temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
 837	else if (data->kind == max6646)
 838		temp = temp_from_u16(data->temp11[attr->index]);
 839	else
 840		temp = temp_from_s16(data->temp11[attr->index]);
 841
 842	/* +16 degrees offset for temp2 for the LM99 */
 843	if (data->kind == lm99 &&  attr->index <= 2)
 844		temp += 16000;
 845
 846	return sprintf(buf, "%d\n", temp);
 847}
 848
 849static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
 850			  const char *buf, size_t count)
 851{
 852	struct {
 853		u8 high;
 854		u8 low;
 855		int channel;
 856	} reg[5] = {
 857		{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
 858		{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
 859		{ LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
 860		{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 },
 861		{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 }
 862	};
 863
 864	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
 865	struct lm90_data *data = dev_get_drvdata(dev);
 866	struct i2c_client *client = data->client;
 867	int nr = attr->nr;
 868	int index = attr->index;
 869	long val;
 870	int err;
 871
 872	err = kstrtol(buf, 10, &val);
 873	if (err < 0)
 874		return err;
 875
 876	/* +16 degrees offset for temp2 for the LM99 */
 877	if (data->kind == lm99 && index <= 2)
 878		val -= 16000;
 879
 880	mutex_lock(&data->update_lock);
 881	if (data->kind == adt7461 || data->kind == tmp451)
 882		data->temp11[index] = temp_to_u16_adt7461(data, val);
 883	else if (data->kind == max6646)
 884		data->temp11[index] = temp_to_u8(val) << 8;
 885	else if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
 886		data->temp11[index] = temp_to_s16(val);
 887	else
 888		data->temp11[index] = temp_to_s8(val) << 8;
 889
 890	lm90_select_remote_channel(client, data, reg[nr].channel);
 891	i2c_smbus_write_byte_data(client, reg[nr].high,
 892				  data->temp11[index] >> 8);
 893	if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
 894		i2c_smbus_write_byte_data(client, reg[nr].low,
 895					  data->temp11[index] & 0xff);
 896	lm90_select_remote_channel(client, data, 0);
 897
 898	mutex_unlock(&data->update_lock);
 899	return count;
 900}
 901
 902static ssize_t show_temphyst(struct device *dev,
 903			     struct device_attribute *devattr,
 904			     char *buf)
 905{
 906	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 907	struct lm90_data *data = lm90_update_device(dev);
 908	int temp;
 909
 910	if (data->kind == adt7461 || data->kind == tmp451)
 911		temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
 912	else if (data->kind == max6646)
 913		temp = temp_from_u8(data->temp8[attr->index]);
 914	else
 915		temp = temp_from_s8(data->temp8[attr->index]);
 916
 917	/* +16 degrees offset for temp2 for the LM99 */
 918	if (data->kind == lm99 && attr->index == 3)
 919		temp += 16000;
 920
 921	return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst));
 922}
 923
 924static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
 925			    const char *buf, size_t count)
 926{
 927	struct lm90_data *data = dev_get_drvdata(dev);
 928	struct i2c_client *client = data->client;
 929	long val;
 930	int err;
 931	int temp;
 932
 933	err = kstrtol(buf, 10, &val);
 934	if (err < 0)
 935		return err;
 936
 937	mutex_lock(&data->update_lock);
 938	if (data->kind == adt7461 || data->kind == tmp451)
 939		temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]);
 940	else if (data->kind == max6646)
 941		temp = temp_from_u8(data->temp8[LOCAL_CRIT]);
 942	else
 943		temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
 944
 945	data->temp_hyst = hyst_to_reg(temp - val);
 946	i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
 947				  data->temp_hyst);
 948	mutex_unlock(&data->update_lock);
 949	return count;
 950}
 951
 952static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
 953			   char *buf)
 954{
 955	struct lm90_data *data = lm90_update_device(dev);
 956	return sprintf(buf, "%d\n", data->alarms);
 957}
 958
 959static ssize_t show_alarm(struct device *dev, struct device_attribute
 960			  *devattr, char *buf)
 961{
 962	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 963	struct lm90_data *data = lm90_update_device(dev);
 964	int bitnr = attr->index;
 965
 966	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
 967}
 968
 969static ssize_t show_update_interval(struct device *dev,
 970				    struct device_attribute *attr, char *buf)
 971{
 972	struct lm90_data *data = dev_get_drvdata(dev);
 973
 974	return sprintf(buf, "%u\n", data->update_interval);
 975}
 976
 977static ssize_t set_update_interval(struct device *dev,
 978				   struct device_attribute *attr,
 979				   const char *buf, size_t count)
 980{
 981	struct lm90_data *data = dev_get_drvdata(dev);
 982	struct i2c_client *client = data->client;
 983	unsigned long val;
 984	int err;
 985
 986	err = kstrtoul(buf, 10, &val);
 987	if (err)
 988		return err;
 989
 990	mutex_lock(&data->update_lock);
 991	lm90_set_convrate(client, data, clamp_val(val, 0, 100000));
 992	mutex_unlock(&data->update_lock);
 993
 994	return count;
 995}
 996
 997static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL,
 998	0, LOCAL_TEMP);
 999static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL,
1000	0, REMOTE_TEMP);
1001static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
1002	set_temp8, LOCAL_LOW);
1003static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
1004	set_temp11, 0, REMOTE_LOW);
1005static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
1006	set_temp8, LOCAL_HIGH);
1007static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
1008	set_temp11, 1, REMOTE_HIGH);
1009static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
1010	set_temp8, LOCAL_CRIT);
1011static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
1012	set_temp8, REMOTE_CRIT);
1013static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
1014	set_temphyst, LOCAL_CRIT);
1015static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL,
1016	REMOTE_CRIT);
1017static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
1018	set_temp11, 2, REMOTE_OFFSET);
1019
1020/* Individual alarm files */
1021static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
1022static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
1023static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
1024static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
1025static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1026static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
1027static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
1028/* Raw alarm file for compatibility */
1029static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1030
1031static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
1032		   set_update_interval);
1033
1034static struct attribute *lm90_attributes[] = {
1035	&sensor_dev_attr_temp1_input.dev_attr.attr,
1036	&sensor_dev_attr_temp2_input.dev_attr.attr,
1037	&sensor_dev_attr_temp1_min.dev_attr.attr,
1038	&sensor_dev_attr_temp2_min.dev_attr.attr,
1039	&sensor_dev_attr_temp1_max.dev_attr.attr,
1040	&sensor_dev_attr_temp2_max.dev_attr.attr,
1041	&sensor_dev_attr_temp1_crit.dev_attr.attr,
1042	&sensor_dev_attr_temp2_crit.dev_attr.attr,
1043	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
1044	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
1045
1046	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
1047	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
1048	&sensor_dev_attr_temp2_fault.dev_attr.attr,
1049	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
1050	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
1051	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
1052	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
1053	&dev_attr_alarms.attr,
1054	&dev_attr_update_interval.attr,
1055	NULL
1056};
1057
1058static const struct attribute_group lm90_group = {
1059	.attrs = lm90_attributes,
1060};
1061
1062static struct attribute *lm90_temp2_offset_attributes[] = {
1063	&sensor_dev_attr_temp2_offset.dev_attr.attr,
1064	NULL
1065};
1066
1067static const struct attribute_group lm90_temp2_offset_group = {
1068	.attrs = lm90_temp2_offset_attributes,
1069};
1070
1071/*
1072 * Additional attributes for devices with emergency sensors
1073 */
1074static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8,
1075	set_temp8, LOCAL_EMERG);
1076static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8,
1077	set_temp8, REMOTE_EMERG);
1078static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst,
1079			  NULL, LOCAL_EMERG);
1080static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst,
1081			  NULL, REMOTE_EMERG);
1082
1083static struct attribute *lm90_emergency_attributes[] = {
1084	&sensor_dev_attr_temp1_emergency.dev_attr.attr,
1085	&sensor_dev_attr_temp2_emergency.dev_attr.attr,
1086	&sensor_dev_attr_temp1_emergency_hyst.dev_attr.attr,
1087	&sensor_dev_attr_temp2_emergency_hyst.dev_attr.attr,
1088	NULL
1089};
1090
1091static const struct attribute_group lm90_emergency_group = {
1092	.attrs = lm90_emergency_attributes,
1093};
1094
1095static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15);
1096static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13);
1097
1098static struct attribute *lm90_emergency_alarm_attributes[] = {
1099	&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
1100	&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
1101	NULL
1102};
1103
1104static const struct attribute_group lm90_emergency_alarm_group = {
1105	.attrs = lm90_emergency_alarm_attributes,
1106};
1107
1108/*
1109 * Additional attributes for devices with 3 temperature sensors
1110 */
1111static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL,
1112	0, REMOTE2_TEMP);
1113static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
1114	set_temp11, 3, REMOTE2_LOW);
1115static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
1116	set_temp11, 4, REMOTE2_HIGH);
1117static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
1118	set_temp8, REMOTE2_CRIT);
1119static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL,
1120	REMOTE2_CRIT);
1121static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
1122	set_temp8, REMOTE2_EMERG);
1123static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
1124			  NULL, REMOTE2_EMERG);
1125
1126static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
1127static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
1128static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11);
1129static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12);
1130static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14);
1131
1132static struct attribute *lm90_temp3_attributes[] = {
1133	&sensor_dev_attr_temp3_input.dev_attr.attr,
1134	&sensor_dev_attr_temp3_min.dev_attr.attr,
1135	&sensor_dev_attr_temp3_max.dev_attr.attr,
1136	&sensor_dev_attr_temp3_crit.dev_attr.attr,
1137	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
1138	&sensor_dev_attr_temp3_emergency.dev_attr.attr,
1139	&sensor_dev_attr_temp3_emergency_hyst.dev_attr.attr,
1140
1141	&sensor_dev_attr_temp3_fault.dev_attr.attr,
1142	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
1143	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
1144	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
1145	&sensor_dev_attr_temp3_emergency_alarm.dev_attr.attr,
1146	NULL
1147};
1148
1149static const struct attribute_group lm90_temp3_group = {
1150	.attrs = lm90_temp3_attributes,
1151};
1152
1153/* pec used for ADM1032 only */
1154static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
1155			char *buf)
1156{
1157	struct i2c_client *client = to_i2c_client(dev);
1158	return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
1159}
1160
1161static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
1162		       const char *buf, size_t count)
1163{
1164	struct i2c_client *client = to_i2c_client(dev);
1165	long val;
1166	int err;
1167
1168	err = kstrtol(buf, 10, &val);
1169	if (err < 0)
1170		return err;
1171
1172	switch (val) {
1173	case 0:
1174		client->flags &= ~I2C_CLIENT_PEC;
1175		break;
1176	case 1:
1177		client->flags |= I2C_CLIENT_PEC;
1178		break;
1179	default:
1180		return -EINVAL;
1181	}
1182
1183	return count;
1184}
1185
1186static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
1187
1188/*
1189 * Real code
1190 */
1191
1192/* Return 0 if detection is successful, -ENODEV otherwise */
1193static int lm90_detect(struct i2c_client *client,
1194		       struct i2c_board_info *info)
1195{
1196	struct i2c_adapter *adapter = client->adapter;
1197	int address = client->addr;
1198	const char *name = NULL;
1199	int man_id, chip_id, config1, config2, convrate;
1200
1201	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1202		return -ENODEV;
1203
1204	/* detection and identification */
1205	man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID);
1206	chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID);
1207	config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
1208	convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE);
1209	if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0)
1210		return -ENODEV;
1211
1212	if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) {
1213		config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2);
1214		if (config2 < 0)
1215			return -ENODEV;
1216	} else
1217		config2 = 0;		/* Make compiler happy */
1218
1219	if ((address == 0x4C || address == 0x4D)
1220	 && man_id == 0x01) { /* National Semiconductor */
1221		if ((config1 & 0x2A) == 0x00
1222		 && (config2 & 0xF8) == 0x00
1223		 && convrate <= 0x09) {
1224			if (address == 0x4C
1225			 && (chip_id & 0xF0) == 0x20) { /* LM90 */
1226				name = "lm90";
1227			} else
1228			if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
1229				name = "lm99";
1230				dev_info(&adapter->dev,
1231					 "Assuming LM99 chip at 0x%02x\n",
1232					 address);
1233				dev_info(&adapter->dev,
1234					 "If it is an LM89, instantiate it "
1235					 "with the new_device sysfs "
1236					 "interface\n");
1237			} else
1238			if (address == 0x4C
1239			 && (chip_id & 0xF0) == 0x10) { /* LM86 */
1240				name = "lm86";
1241			}
1242		}
1243	} else
1244	if ((address == 0x4C || address == 0x4D)
1245	 && man_id == 0x41) { /* Analog Devices */
1246		if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
1247		 && (config1 & 0x3F) == 0x00
1248		 && convrate <= 0x0A) {
1249			name = "adm1032";
1250			/*
1251			 * The ADM1032 supports PEC, but only if combined
1252			 * transactions are not used.
1253			 */
1254			if (i2c_check_functionality(adapter,
1255						    I2C_FUNC_SMBUS_BYTE))
1256				info->flags |= I2C_CLIENT_PEC;
1257		} else
1258		if (chip_id == 0x51 /* ADT7461 */
1259		 && (config1 & 0x1B) == 0x00
1260		 && convrate <= 0x0A) {
1261			name = "adt7461";
1262		} else
1263		if (chip_id == 0x57 /* ADT7461A, NCT1008 */
1264		 && (config1 & 0x1B) == 0x00
1265		 && convrate <= 0x0A) {
1266			name = "adt7461a";
1267		}
1268	} else
1269	if (man_id == 0x4D) { /* Maxim */
1270		int emerg, emerg2, status2;
1271
1272		/*
1273		 * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read
1274		 * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG
1275		 * exists, both readings will reflect the same value. Otherwise,
1276		 * the readings will be different.
1277		 */
1278		emerg = i2c_smbus_read_byte_data(client,
1279						 MAX6659_REG_R_REMOTE_EMERG);
1280		man_id = i2c_smbus_read_byte_data(client,
1281						  LM90_REG_R_MAN_ID);
1282		emerg2 = i2c_smbus_read_byte_data(client,
1283						  MAX6659_REG_R_REMOTE_EMERG);
1284		status2 = i2c_smbus_read_byte_data(client,
1285						   MAX6696_REG_R_STATUS2);
1286		if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0)
1287			return -ENODEV;
1288
1289		/*
1290		 * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
1291		 * register. Reading from that address will return the last
1292		 * read value, which in our case is those of the man_id
1293		 * register. Likewise, the config1 register seems to lack a
1294		 * low nibble, so the value will be those of the previous
1295		 * read, so in our case those of the man_id register.
1296		 * MAX6659 has a third set of upper temperature limit registers.
1297		 * Those registers also return values on MAX6657 and MAX6658,
1298		 * thus the only way to detect MAX6659 is by its address.
1299		 * For this reason it will be mis-detected as MAX6657 if its
1300		 * address is 0x4C.
1301		 */
1302		if (chip_id == man_id
1303		 && (address == 0x4C || address == 0x4D || address == 0x4E)
1304		 && (config1 & 0x1F) == (man_id & 0x0F)
1305		 && convrate <= 0x09) {
1306			if (address == 0x4C)
1307				name = "max6657";
1308			else
1309				name = "max6659";
1310		} else
1311		/*
1312		 * Even though MAX6695 and MAX6696 do not have a chip ID
1313		 * register, reading it returns 0x01. Bit 4 of the config1
1314		 * register is unused and should return zero when read. Bit 0 of
1315		 * the status2 register is unused and should return zero when
1316		 * read.
1317		 *
1318		 * MAX6695 and MAX6696 have an additional set of temperature
1319		 * limit registers. We can detect those chips by checking if
1320		 * one of those registers exists.
1321		 */
1322		if (chip_id == 0x01
1323		 && (config1 & 0x10) == 0x00
1324		 && (status2 & 0x01) == 0x00
1325		 && emerg == emerg2
1326		 && convrate <= 0x07) {
1327			name = "max6696";
1328		} else
1329		/*
1330		 * The chip_id register of the MAX6680 and MAX6681 holds the
1331		 * revision of the chip. The lowest bit of the config1 register
1332		 * is unused and should return zero when read, so should the
1333		 * second to last bit of config1 (software reset).
1334		 */
1335		if (chip_id == 0x01
1336		 && (config1 & 0x03) == 0x00
1337		 && convrate <= 0x07) {
1338			name = "max6680";
1339		} else
1340		/*
1341		 * The chip_id register of the MAX6646/6647/6649 holds the
1342		 * revision of the chip. The lowest 6 bits of the config1
1343		 * register are unused and should return zero when read.
1344		 */
1345		if (chip_id == 0x59
1346		 && (config1 & 0x3f) == 0x00
1347		 && convrate <= 0x07) {
1348			name = "max6646";
1349		}
1350	} else
1351	if (address == 0x4C
1352	 && man_id == 0x5C) { /* Winbond/Nuvoton */
1353		if ((config1 & 0x2A) == 0x00
1354		 && (config2 & 0xF8) == 0x00) {
1355			if (chip_id == 0x01 /* W83L771W/G */
1356			 && convrate <= 0x09) {
1357				name = "w83l771";
1358			} else
1359			if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */
1360			 && convrate <= 0x08) {
1361				name = "w83l771";
1362			}
1363		}
1364	} else
1365	if (address >= 0x48 && address <= 0x4F
1366	 && man_id == 0xA1) { /*  NXP Semiconductor/Philips */
1367		if (chip_id == 0x00
1368		 && (config1 & 0x2A) == 0x00
1369		 && (config2 & 0xFE) == 0x00
1370		 && convrate <= 0x09) {
1371			name = "sa56004";
1372		}
1373	} else
1374	if ((address == 0x4C || address == 0x4D)
1375	 && man_id == 0x47) { /* GMT */
1376		if (chip_id == 0x01 /* G781 */
1377		 && (config1 & 0x3F) == 0x00
1378		 && convrate <= 0x08)
1379			name = "g781";
1380	} else
1381	if (address == 0x4C
1382	 && man_id == 0x55) { /* Texas Instruments */
1383		int local_ext;
1384
1385		local_ext = i2c_smbus_read_byte_data(client,
1386						     TMP451_REG_R_LOCAL_TEMPL);
1387
1388		if (chip_id == 0x00 /* TMP451 */
1389		 && (config1 & 0x1B) == 0x00
1390		 && convrate <= 0x09
1391		 && (local_ext & 0x0F) == 0x00)
1392			name = "tmp451";
1393	}
1394
1395	if (!name) { /* identification failed */
1396		dev_dbg(&adapter->dev,
1397			"Unsupported chip at 0x%02x (man_id=0x%02X, "
1398			"chip_id=0x%02X)\n", address, man_id, chip_id);
1399		return -ENODEV;
1400	}
1401
1402	strlcpy(info->type, name, I2C_NAME_SIZE);
1403
1404	return 0;
1405}
1406
1407static void lm90_restore_conf(struct i2c_client *client, struct lm90_data *data)
1408{
1409	/* Restore initial configuration */
1410	i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
1411				  data->convrate_orig);
1412	i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1413				  data->config_orig);
1414}
1415
1416static void lm90_init_client(struct i2c_client *client, struct lm90_data *data)
1417{
1418	u8 config, convrate;
1419
1420	if (lm90_read_reg(client, LM90_REG_R_CONVRATE, &convrate) < 0) {
1421		dev_warn(&client->dev, "Failed to read convrate register!\n");
1422		convrate = LM90_DEF_CONVRATE_RVAL;
1423	}
1424	data->convrate_orig = convrate;
1425
1426	/*
1427	 * Start the conversions.
1428	 */
1429	lm90_set_convrate(client, data, 500);	/* 500ms; 2Hz conversion rate */
1430	if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
1431		dev_warn(&client->dev, "Initialization failed!\n");
1432		return;
1433	}
1434	data->config_orig = config;
1435
1436	/* Check Temperature Range Select */
1437	if (data->kind == adt7461 || data->kind == tmp451) {
1438		if (config & 0x04)
1439			data->flags |= LM90_FLAG_ADT7461_EXT;
1440	}
1441
1442	/*
1443	 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
1444	 * 0.125 degree resolution) and range (0x08, extend range
1445	 * to -64 degree) mode for the remote temperature sensor.
1446	 */
1447	if (data->kind == max6680)
1448		config |= 0x18;
1449
1450	/*
1451	 * Select external channel 0 for max6695/96
1452	 */
1453	if (data->kind == max6696)
1454		config &= ~0x08;
1455
1456	config &= 0xBF;	/* run */
1457	if (config != data->config_orig) /* Only write if changed */
1458		i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
1459}
1460
1461static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
1462{
1463	struct lm90_data *data = i2c_get_clientdata(client);
1464	u8 st, st2 = 0;
1465
1466	lm90_read_reg(client, LM90_REG_R_STATUS, &st);
1467
1468	if (data->kind == max6696)
1469		lm90_read_reg(client, MAX6696_REG_R_STATUS2, &st2);
1470
1471	*status = st | (st2 << 8);
1472
1473	if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0)
1474		return false;
1475
1476	if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
1477	    (st2 & MAX6696_STATUS2_LOT2))
1478		dev_warn(&client->dev,
1479			 "temp%d out of range, please check!\n", 1);
1480	if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
1481	    (st2 & MAX6696_STATUS2_ROT2))
1482		dev_warn(&client->dev,
1483			 "temp%d out of range, please check!\n", 2);
1484	if (st & LM90_STATUS_ROPEN)
1485		dev_warn(&client->dev,
1486			 "temp%d diode open, please check!\n", 2);
1487	if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
1488		   MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
1489		dev_warn(&client->dev,
1490			 "temp%d out of range, please check!\n", 3);
1491	if (st2 & MAX6696_STATUS2_R2OPEN)
1492		dev_warn(&client->dev,
1493			 "temp%d diode open, please check!\n", 3);
1494
1495	return true;
1496}
1497
1498static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
1499{
1500	struct i2c_client *client = dev_id;
1501	u16 status;
1502
1503	if (lm90_is_tripped(client, &status))
1504		return IRQ_HANDLED;
1505	else
1506		return IRQ_NONE;
1507}
1508
1509static int lm90_probe(struct i2c_client *client,
1510		      const struct i2c_device_id *id)
1511{
1512	struct device *dev = &client->dev;
1513	struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
1514	struct lm90_data *data;
1515	struct regulator *regulator;
1516	int groups = 0;
1517	int err;
1518
1519	regulator = devm_regulator_get(dev, "vcc");
1520	if (IS_ERR(regulator))
1521		return PTR_ERR(regulator);
1522
1523	err = regulator_enable(regulator);
1524	if (err < 0) {
1525		dev_err(dev, "Failed to enable regulator: %d\n", err);
1526		return err;
1527	}
1528
1529	data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL);
1530	if (!data)
1531		return -ENOMEM;
1532
1533	data->client = client;
1534	i2c_set_clientdata(client, data);
1535	mutex_init(&data->update_lock);
1536
1537	data->regulator = regulator;
1538
1539	/* Set the device type */
1540	data->kind = id->driver_data;
1541	if (data->kind == adm1032) {
1542		if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
1543			client->flags &= ~I2C_CLIENT_PEC;
1544	}
1545
1546	/*
1547	 * Different devices have different alarm bits triggering the
1548	 * ALERT# output
1549	 */
1550	data->alert_alarms = lm90_params[data->kind].alert_alarms;
1551
1552	/* Set chip capabilities */
1553	data->flags = lm90_params[data->kind].flags;
1554	data->reg_local_ext = lm90_params[data->kind].reg_local_ext;
1555
1556	/* Set maximum conversion rate */
1557	data->max_convrate = lm90_params[data->kind].max_convrate;
1558
1559	/* Initialize the LM90 chip */
1560	lm90_init_client(client, data);
1561
1562	/* Register sysfs hooks */
1563	data->groups[groups++] = &lm90_group;
1564
1565	if (data->flags & LM90_HAVE_OFFSET)
1566		data->groups[groups++] = &lm90_temp2_offset_group;
1567
1568	if (data->flags & LM90_HAVE_EMERGENCY)
1569		data->groups[groups++] = &lm90_emergency_group;
1570
1571	if (data->flags & LM90_HAVE_EMERGENCY_ALARM)
1572		data->groups[groups++] = &lm90_emergency_alarm_group;
1573
1574	if (data->flags & LM90_HAVE_TEMP3)
1575		data->groups[groups++] = &lm90_temp3_group;
1576
1577	if (client->flags & I2C_CLIENT_PEC) {
1578		err = device_create_file(dev, &dev_attr_pec);
1579		if (err)
1580			goto exit_restore;
1581	}
1582
1583	data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
1584							    data, data->groups);
1585	if (IS_ERR(data->hwmon_dev)) {
1586		err = PTR_ERR(data->hwmon_dev);
1587		goto exit_remove_pec;
1588	}
1589
1590	if (client->irq) {
1591		dev_dbg(dev, "IRQ: %d\n", client->irq);
1592		err = devm_request_threaded_irq(dev, client->irq,
1593						NULL, lm90_irq_thread,
1594						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1595						"lm90", client);
1596		if (err < 0) {
1597			dev_err(dev, "cannot request IRQ %d\n", client->irq);
1598			goto exit_unregister;
1599		}
1600	}
1601
1602	return 0;
1603
1604exit_unregister:
1605	hwmon_device_unregister(data->hwmon_dev);
1606exit_remove_pec:
1607	device_remove_file(dev, &dev_attr_pec);
1608exit_restore:
1609	lm90_restore_conf(client, data);
1610	regulator_disable(data->regulator);
1611
1612	return err;
1613}
1614
1615static int lm90_remove(struct i2c_client *client)
1616{
1617	struct lm90_data *data = i2c_get_clientdata(client);
1618
1619	hwmon_device_unregister(data->hwmon_dev);
1620	device_remove_file(&client->dev, &dev_attr_pec);
1621	lm90_restore_conf(client, data);
1622	regulator_disable(data->regulator);
1623
1624	return 0;
1625}
1626
1627static void lm90_alert(struct i2c_client *client, unsigned int flag)
1628{
1629	u16 alarms;
1630
1631	if (lm90_is_tripped(client, &alarms)) {
1632		/*
1633		 * Disable ALERT# output, because these chips don't implement
1634		 * SMBus alert correctly; they should only hold the alert line
1635		 * low briefly.
1636		 */
1637		struct lm90_data *data = i2c_get_clientdata(client);
1638
1639		if ((data->flags & LM90_HAVE_BROKEN_ALERT)
1640		 && (alarms & data->alert_alarms)) {
1641			u8 config;
1642			dev_dbg(&client->dev, "Disabling ALERT#\n");
1643			lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
1644			i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1645						  config | 0x80);
1646		}
1647	} else {
1648		dev_info(&client->dev, "Everything OK\n");
1649	}
1650}
1651
1652static struct i2c_driver lm90_driver = {
1653	.class		= I2C_CLASS_HWMON,
1654	.driver = {
1655		.name	= "lm90",
1656	},
1657	.probe		= lm90_probe,
1658	.remove		= lm90_remove,
1659	.alert		= lm90_alert,
1660	.id_table	= lm90_id,
1661	.detect		= lm90_detect,
1662	.address_list	= normal_i2c,
1663};
1664
1665module_i2c_driver(lm90_driver);
1666
1667MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
1668MODULE_DESCRIPTION("LM90/ADM1032 driver");
1669MODULE_LICENSE("GPL");