drivers/hwmon/lm90.c

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This source file includes following definitions.
adm1032_write_byte
lm90_read_reg
lm90_read16
lm90_update_confreg
lm90_select_remote_channel
lm90_write_convrate
lm90_set_convrate
lm90_update_limits
lm90_update_device
temp_from_s8
temp_from_u8
temp_from_s16
temp_from_u16
temp_to_s8
temp_to_u8
temp_to_s16
hyst_to_reg
temp_from_u8_adt7461
temp_from_u16_adt7461
temp_to_u8_adt7461
temp_to_u16_adt7461
pec_show
pec_store
lm90_get_temp11
lm90_set_temp11
lm90_get_temp8
lm90_set_temp8
lm90_get_temphyst
lm90_set_temphyst
lm90_temp_read
lm90_temp_write
lm90_temp_is_visible
lm90_chip_read
lm90_chip_write
lm90_chip_is_visible
lm90_read
lm90_write
lm90_is_visible
lm90_detect
lm90_restore_conf
lm90_init_client
lm90_is_tripped
lm90_irq_thread
lm90_remove_pec
lm90_regulator_disable
lm90_probe
lm90_alert
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
   4  *          monitoring
   5  * Copyright (C) 2003-2010  Jean Delvare <jdelvare@suse.de>
   6  *
   7  * Based on the lm83 driver. The LM90 is a sensor chip made by National
   8  * Semiconductor. It reports up to two temperatures (its own plus up to
   9  * one external one) with a 0.125 deg resolution (1 deg for local
  10  * temperature) and a 3-4 deg accuracy.
  11  *
  12  * This driver also supports the LM89 and LM99, two other sensor chips
  13  * made by National Semiconductor. Both have an increased remote
  14  * temperature measurement accuracy (1 degree), and the LM99
  15  * additionally shifts remote temperatures (measured and limits) by 16
  16  * degrees, which allows for higher temperatures measurement.
  17  * Note that there is no way to differentiate between both chips.
  18  * When device is auto-detected, the driver will assume an LM99.
  19  *
  20  * This driver also supports the LM86, another sensor chip made by
  21  * National Semiconductor. It is exactly similar to the LM90 except it
  22  * has a higher accuracy.
  23  *
  24  * This driver also supports the ADM1032, a sensor chip made by Analog
  25  * Devices. That chip is similar to the LM90, with a few differences
  26  * that are not handled by this driver. Among others, it has a higher
  27  * accuracy than the LM90, much like the LM86 does.
  28  *
  29  * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
  30  * chips made by Maxim. These chips are similar to the LM86.
  31  * Note that there is no easy way to differentiate between the three
  32  * variants. We use the device address to detect MAX6659, which will result
  33  * in a detection as max6657 if it is on address 0x4c. The extra address
  34  * and features of the MAX6659 are only supported if the chip is configured
  35  * explicitly as max6659, or if its address is not 0x4c.
  36  * These chips lack the remote temperature offset feature.
  37  *
  38  * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
  39  * MAX6692 chips made by Maxim.  These are again similar to the LM86,
  40  * but they use unsigned temperature values and can report temperatures
  41  * from 0 to 145 degrees.
  42  *
  43  * This driver also supports the MAX6680 and MAX6681, two other sensor
  44  * chips made by Maxim. These are quite similar to the other Maxim
  45  * chips. The MAX6680 and MAX6681 only differ in the pinout so they can
  46  * be treated identically.
  47  *
  48  * This driver also supports the MAX6695 and MAX6696, two other sensor
  49  * chips made by Maxim. These are also quite similar to other Maxim
  50  * chips, but support three temperature sensors instead of two. MAX6695
  51  * and MAX6696 only differ in the pinout so they can be treated identically.
  52  *
  53  * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
  54  * NCT1008 from ON Semiconductor. The chips are supported in both compatibility
  55  * and extended mode. They are mostly compatible with LM90 except for a data
  56  * format difference for the temperature value registers.
  57  *
  58  * This driver also supports the SA56004 from Philips. This device is
  59  * pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
  60  *
  61  * This driver also supports the G781 from GMT. This device is compatible
  62  * with the ADM1032.
  63  *
  64  * This driver also supports TMP451 from Texas Instruments. This device is
  65  * supported in both compatibility and extended mode. It's mostly compatible
  66  * with ADT7461 except for local temperature low byte register and max
  67  * conversion rate.
  68  *
  69  * Since the LM90 was the first chipset supported by this driver, most
  70  * comments will refer to this chipset, but are actually general and
  71  * concern all supported chipsets, unless mentioned otherwise.
  72  */
  73 
  74 #include <linux/module.h>
  75 #include <linux/init.h>
  76 #include <linux/slab.h>
  77 #include <linux/jiffies.h>
  78 #include <linux/i2c.h>
  79 #include <linux/hwmon.h>
  80 #include <linux/err.h>
  81 #include <linux/mutex.h>
  82 #include <linux/of_device.h>
  83 #include <linux/sysfs.h>
  84 #include <linux/interrupt.h>
  85 #include <linux/regulator/consumer.h>
  86 
  87 /*
  88  * Addresses to scan
  89  * Address is fully defined internally and cannot be changed except for
  90  * MAX6659, MAX6680 and MAX6681.
  91  * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
  92  * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
  93  * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
  94  * have address 0x4d.
  95  * MAX6647 has address 0x4e.
  96  * MAX6659 can have address 0x4c, 0x4d or 0x4e.
  97  * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
  98  * 0x4c, 0x4d or 0x4e.
  99  * SA56004 can have address 0x48 through 0x4F.
 100  */
 101 
 102 static const unsigned short normal_i2c[] = {
 103         0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
 104         0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
 105 
 106 enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
 107         max6646, w83l771, max6696, sa56004, g781, tmp451 };
 108 
 109 /*
 110  * The LM90 registers
 111  */
 112 
 113 #define LM90_REG_R_MAN_ID               0xFE
 114 #define LM90_REG_R_CHIP_ID              0xFF
 115 #define LM90_REG_R_CONFIG1              0x03
 116 #define LM90_REG_W_CONFIG1              0x09
 117 #define LM90_REG_R_CONFIG2              0xBF
 118 #define LM90_REG_W_CONFIG2              0xBF
 119 #define LM90_REG_R_CONVRATE             0x04
 120 #define LM90_REG_W_CONVRATE             0x0A
 121 #define LM90_REG_R_STATUS               0x02
 122 #define LM90_REG_R_LOCAL_TEMP           0x00
 123 #define LM90_REG_R_LOCAL_HIGH           0x05
 124 #define LM90_REG_W_LOCAL_HIGH           0x0B
 125 #define LM90_REG_R_LOCAL_LOW            0x06
 126 #define LM90_REG_W_LOCAL_LOW            0x0C
 127 #define LM90_REG_R_LOCAL_CRIT           0x20
 128 #define LM90_REG_W_LOCAL_CRIT           0x20
 129 #define LM90_REG_R_REMOTE_TEMPH         0x01
 130 #define LM90_REG_R_REMOTE_TEMPL         0x10
 131 #define LM90_REG_R_REMOTE_OFFSH         0x11
 132 #define LM90_REG_W_REMOTE_OFFSH         0x11
 133 #define LM90_REG_R_REMOTE_OFFSL         0x12
 134 #define LM90_REG_W_REMOTE_OFFSL         0x12
 135 #define LM90_REG_R_REMOTE_HIGHH         0x07
 136 #define LM90_REG_W_REMOTE_HIGHH         0x0D
 137 #define LM90_REG_R_REMOTE_HIGHL         0x13
 138 #define LM90_REG_W_REMOTE_HIGHL         0x13
 139 #define LM90_REG_R_REMOTE_LOWH          0x08
 140 #define LM90_REG_W_REMOTE_LOWH          0x0E
 141 #define LM90_REG_R_REMOTE_LOWL          0x14
 142 #define LM90_REG_W_REMOTE_LOWL          0x14
 143 #define LM90_REG_R_REMOTE_CRIT          0x19
 144 #define LM90_REG_W_REMOTE_CRIT          0x19
 145 #define LM90_REG_R_TCRIT_HYST           0x21
 146 #define LM90_REG_W_TCRIT_HYST           0x21
 147 
 148 /* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
 149 
 150 #define MAX6657_REG_R_LOCAL_TEMPL       0x11
 151 #define MAX6696_REG_R_STATUS2           0x12
 152 #define MAX6659_REG_R_REMOTE_EMERG      0x16
 153 #define MAX6659_REG_W_REMOTE_EMERG      0x16
 154 #define MAX6659_REG_R_LOCAL_EMERG       0x17
 155 #define MAX6659_REG_W_LOCAL_EMERG       0x17
 156 
 157 /*  SA56004 registers */
 158 
 159 #define SA56004_REG_R_LOCAL_TEMPL 0x22
 160 
 161 #define LM90_MAX_CONVRATE_MS    16000   /* Maximum conversion rate in ms */
 162 
 163 /* TMP451 registers */
 164 #define TMP451_REG_R_LOCAL_TEMPL        0x15
 165 
 166 /*
 167  * Device flags
 168  */
 169 #define LM90_FLAG_ADT7461_EXT   (1 << 0) /* ADT7461 extended mode       */
 170 /* Device features */
 171 #define LM90_HAVE_OFFSET        (1 << 1) /* temperature offset register */
 172 #define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit       */
 173 #define LM90_HAVE_EMERGENCY     (1 << 4) /* 3rd upper (emergency) limit */
 174 #define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm            */
 175 #define LM90_HAVE_TEMP3         (1 << 6) /* 3rd temperature sensor      */
 176 #define LM90_HAVE_BROKEN_ALERT  (1 << 7) /* Broken alert                */
 177 #define LM90_PAUSE_FOR_CONFIG   (1 << 8) /* Pause conversion for config */
 178 
 179 /* LM90 status */
 180 #define LM90_STATUS_LTHRM       (1 << 0) /* local THERM limit tripped */
 181 #define LM90_STATUS_RTHRM       (1 << 1) /* remote THERM limit tripped */
 182 #define LM90_STATUS_ROPEN       (1 << 2) /* remote is an open circuit */
 183 #define LM90_STATUS_RLOW        (1 << 3) /* remote low temp limit tripped */
 184 #define LM90_STATUS_RHIGH       (1 << 4) /* remote high temp limit tripped */
 185 #define LM90_STATUS_LLOW        (1 << 5) /* local low temp limit tripped */
 186 #define LM90_STATUS_LHIGH       (1 << 6) /* local high temp limit tripped */
 187 
 188 #define MAX6696_STATUS2_R2THRM  (1 << 1) /* remote2 THERM limit tripped */
 189 #define MAX6696_STATUS2_R2OPEN  (1 << 2) /* remote2 is an open circuit */
 190 #define MAX6696_STATUS2_R2LOW   (1 << 3) /* remote2 low temp limit tripped */
 191 #define MAX6696_STATUS2_R2HIGH  (1 << 4) /* remote2 high temp limit tripped */
 192 #define MAX6696_STATUS2_ROT2    (1 << 5) /* remote emergency limit tripped */
 193 #define MAX6696_STATUS2_R2OT2   (1 << 6) /* remote2 emergency limit tripped */
 194 #define MAX6696_STATUS2_LOT2    (1 << 7) /* local emergency limit tripped */
 195 
 196 /*
 197  * Driver data (common to all clients)
 198  */
 199 
 200 static const struct i2c_device_id lm90_id[] = {
 201         { "adm1032", adm1032 },
 202         { "adt7461", adt7461 },
 203         { "adt7461a", adt7461 },
 204         { "g781", g781 },
 205         { "lm90", lm90 },
 206         { "lm86", lm86 },
 207         { "lm89", lm86 },
 208         { "lm99", lm99 },
 209         { "max6646", max6646 },
 210         { "max6647", max6646 },
 211         { "max6649", max6646 },
 212         { "max6657", max6657 },
 213         { "max6658", max6657 },
 214         { "max6659", max6659 },
 215         { "max6680", max6680 },
 216         { "max6681", max6680 },
 217         { "max6695", max6696 },
 218         { "max6696", max6696 },
 219         { "nct1008", adt7461 },
 220         { "w83l771", w83l771 },
 221         { "sa56004", sa56004 },
 222         { "tmp451", tmp451 },
 223         { }
 224 };
 225 MODULE_DEVICE_TABLE(i2c, lm90_id);
 226 
 227 static const struct of_device_id __maybe_unused lm90_of_match[] = {
 228         {
 229                 .compatible = "adi,adm1032",
 230                 .data = (void *)adm1032
 231         },
 232         {
 233                 .compatible = "adi,adt7461",
 234                 .data = (void *)adt7461
 235         },
 236         {
 237                 .compatible = "adi,adt7461a",
 238                 .data = (void *)adt7461
 239         },
 240         {
 241                 .compatible = "gmt,g781",
 242                 .data = (void *)g781
 243         },
 244         {
 245                 .compatible = "national,lm90",
 246                 .data = (void *)lm90
 247         },
 248         {
 249                 .compatible = "national,lm86",
 250                 .data = (void *)lm86
 251         },
 252         {
 253                 .compatible = "national,lm89",
 254                 .data = (void *)lm86
 255         },
 256         {
 257                 .compatible = "national,lm99",
 258                 .data = (void *)lm99
 259         },
 260         {
 261                 .compatible = "dallas,max6646",
 262                 .data = (void *)max6646
 263         },
 264         {
 265                 .compatible = "dallas,max6647",
 266                 .data = (void *)max6646
 267         },
 268         {
 269                 .compatible = "dallas,max6649",
 270                 .data = (void *)max6646
 271         },
 272         {
 273                 .compatible = "dallas,max6657",
 274                 .data = (void *)max6657
 275         },
 276         {
 277                 .compatible = "dallas,max6658",
 278                 .data = (void *)max6657
 279         },
 280         {
 281                 .compatible = "dallas,max6659",
 282                 .data = (void *)max6659
 283         },
 284         {
 285                 .compatible = "dallas,max6680",
 286                 .data = (void *)max6680
 287         },
 288         {
 289                 .compatible = "dallas,max6681",
 290                 .data = (void *)max6680
 291         },
 292         {
 293                 .compatible = "dallas,max6695",
 294                 .data = (void *)max6696
 295         },
 296         {
 297                 .compatible = "dallas,max6696",
 298                 .data = (void *)max6696
 299         },
 300         {
 301                 .compatible = "onnn,nct1008",
 302                 .data = (void *)adt7461
 303         },
 304         {
 305                 .compatible = "winbond,w83l771",
 306                 .data = (void *)w83l771
 307         },
 308         {
 309                 .compatible = "nxp,sa56004",
 310                 .data = (void *)sa56004
 311         },
 312         {
 313                 .compatible = "ti,tmp451",
 314                 .data = (void *)tmp451
 315         },
 316         { },
 317 };
 318 MODULE_DEVICE_TABLE(of, lm90_of_match);
 319 
 320 /*
 321  * chip type specific parameters
 322  */
 323 struct lm90_params {
 324         u32 flags;              /* Capabilities */
 325         u16 alert_alarms;       /* Which alarm bits trigger ALERT# */
 326                                 /* Upper 8 bits for max6695/96 */
 327         u8 max_convrate;        /* Maximum conversion rate register value */
 328         u8 reg_local_ext;       /* Extended local temp register (optional) */
 329 };
 330 
 331 static const struct lm90_params lm90_params[] = {
 332         [adm1032] = {
 333                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 334                   | LM90_HAVE_BROKEN_ALERT,
 335                 .alert_alarms = 0x7c,
 336                 .max_convrate = 10,
 337         },
 338         [adt7461] = {
 339                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 340                   | LM90_HAVE_BROKEN_ALERT,
 341                 .alert_alarms = 0x7c,
 342                 .max_convrate = 10,
 343         },
 344         [g781] = {
 345                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 346                   | LM90_HAVE_BROKEN_ALERT,
 347                 .alert_alarms = 0x7c,
 348                 .max_convrate = 8,
 349         },
 350         [lm86] = {
 351                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 352                 .alert_alarms = 0x7b,
 353                 .max_convrate = 9,
 354         },
 355         [lm90] = {
 356                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 357                 .alert_alarms = 0x7b,
 358                 .max_convrate = 9,
 359         },
 360         [lm99] = {
 361                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 362                 .alert_alarms = 0x7b,
 363                 .max_convrate = 9,
 364         },
 365         [max6646] = {
 366                 .alert_alarms = 0x7c,
 367                 .max_convrate = 6,
 368                 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 369         },
 370         [max6657] = {
 371                 .flags = LM90_PAUSE_FOR_CONFIG,
 372                 .alert_alarms = 0x7c,
 373                 .max_convrate = 8,
 374                 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 375         },
 376         [max6659] = {
 377                 .flags = LM90_HAVE_EMERGENCY,
 378                 .alert_alarms = 0x7c,
 379                 .max_convrate = 8,
 380                 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 381         },
 382         [max6680] = {
 383                 .flags = LM90_HAVE_OFFSET,
 384                 .alert_alarms = 0x7c,
 385                 .max_convrate = 7,
 386         },
 387         [max6696] = {
 388                 .flags = LM90_HAVE_EMERGENCY
 389                   | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
 390                 .alert_alarms = 0x1c7c,
 391                 .max_convrate = 6,
 392                 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
 393         },
 394         [w83l771] = {
 395                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 396                 .alert_alarms = 0x7c,
 397                 .max_convrate = 8,
 398         },
 399         [sa56004] = {
 400                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
 401                 .alert_alarms = 0x7b,
 402                 .max_convrate = 9,
 403                 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
 404         },
 405         [tmp451] = {
 406                 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 407                   | LM90_HAVE_BROKEN_ALERT,
 408                 .alert_alarms = 0x7c,
 409                 .max_convrate = 9,
 410                 .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
 411         },
 412 };
 413 
 414 /*
 415  * TEMP8 register index
 416  */
 417 enum lm90_temp8_reg_index {
 418         LOCAL_LOW = 0,
 419         LOCAL_HIGH,
 420         LOCAL_CRIT,
 421         REMOTE_CRIT,
 422         LOCAL_EMERG,    /* max6659 and max6695/96 */
 423         REMOTE_EMERG,   /* max6659 and max6695/96 */
 424         REMOTE2_CRIT,   /* max6695/96 only */
 425         REMOTE2_EMERG,  /* max6695/96 only */
 426         TEMP8_REG_NUM
 427 };
 428 
 429 /*
 430  * TEMP11 register index
 431  */
 432 enum lm90_temp11_reg_index {
 433         REMOTE_TEMP = 0,
 434         REMOTE_LOW,
 435         REMOTE_HIGH,
 436         REMOTE_OFFSET,  /* except max6646, max6657/58/59, and max6695/96 */
 437         LOCAL_TEMP,
 438         REMOTE2_TEMP,   /* max6695/96 only */
 439         REMOTE2_LOW,    /* max6695/96 only */
 440         REMOTE2_HIGH,   /* max6695/96 only */
 441         TEMP11_REG_NUM
 442 };
 443 
 444 /*
 445  * Client data (each client gets its own)
 446  */
 447 
 448 struct lm90_data {
 449         struct i2c_client *client;
 450         u32 channel_config[4];
 451         struct hwmon_channel_info temp_info;
 452         const struct hwmon_channel_info *info[3];
 453         struct hwmon_chip_info chip;
 454         struct mutex update_lock;
 455         bool valid;             /* true if register values are valid */
 456         unsigned long last_updated; /* in jiffies */
 457         int kind;
 458         u32 flags;
 459 
 460         unsigned int update_interval; /* in milliseconds */
 461 
 462         u8 config;              /* Current configuration register value */
 463         u8 config_orig;         /* Original configuration register value */
 464         u8 convrate_orig;       /* Original conversion rate register value */
 465         u16 alert_alarms;       /* Which alarm bits trigger ALERT# */
 466                                 /* Upper 8 bits for max6695/96 */
 467         u8 max_convrate;        /* Maximum conversion rate */
 468         u8 reg_local_ext;       /* local extension register offset */
 469 
 470         /* registers values */
 471         s8 temp8[TEMP8_REG_NUM];
 472         s16 temp11[TEMP11_REG_NUM];
 473         u8 temp_hyst;
 474         u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
 475 };
 476 
 477 /*
 478  * Support functions
 479  */
 480 
 481 /*
 482  * The ADM1032 supports PEC but not on write byte transactions, so we need
 483  * to explicitly ask for a transaction without PEC.
 484  */
 485 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
 486 {
 487         return i2c_smbus_xfer(client->adapter, client->addr,
 488                               client->flags & ~I2C_CLIENT_PEC,
 489                               I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
 490 }
 491 
 492 /*
 493  * It is assumed that client->update_lock is held (unless we are in
 494  * detection or initialization steps). This matters when PEC is enabled,
 495  * because we don't want the address pointer to change between the write
 496  * byte and the read byte transactions.
 497  */
 498 static int lm90_read_reg(struct i2c_client *client, u8 reg)
 499 {
 500         int err;
 501 
 502         if (client->flags & I2C_CLIENT_PEC) {
 503                 err = adm1032_write_byte(client, reg);
 504                 if (err >= 0)
 505                         err = i2c_smbus_read_byte(client);
 506         } else
 507                 err = i2c_smbus_read_byte_data(client, reg);
 508 
 509         return err;
 510 }
 511 
 512 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl)
 513 {
 514         int oldh, newh, l;
 515 
 516         /*
 517          * There is a trick here. We have to read two registers to have the
 518          * sensor temperature, but we have to beware a conversion could occur
 519          * between the readings. The datasheet says we should either use
 520          * the one-shot conversion register, which we don't want to do
 521          * (disables hardware monitoring) or monitor the busy bit, which is
 522          * impossible (we can't read the values and monitor that bit at the
 523          * exact same time). So the solution used here is to read the high
 524          * byte once, then the low byte, then the high byte again. If the new
 525          * high byte matches the old one, then we have a valid reading. Else
 526          * we have to read the low byte again, and now we believe we have a
 527          * correct reading.
 528          */
 529         oldh = lm90_read_reg(client, regh);
 530         if (oldh < 0)
 531                 return oldh;
 532         l = lm90_read_reg(client, regl);
 533         if (l < 0)
 534                 return l;
 535         newh = lm90_read_reg(client, regh);
 536         if (newh < 0)
 537                 return newh;
 538         if (oldh != newh) {
 539                 l = lm90_read_reg(client, regl);
 540                 if (l < 0)
 541                         return l;
 542         }
 543         return (newh << 8) | l;
 544 }
 545 
 546 static int lm90_update_confreg(struct lm90_data *data, u8 config)
 547 {
 548         if (data->config != config) {
 549                 int err;
 550 
 551                 err = i2c_smbus_write_byte_data(data->client,
 552                                                 LM90_REG_W_CONFIG1,
 553                                                 config);
 554                 if (err)
 555                         return err;
 556                 data->config = config;
 557         }
 558         return 0;
 559 }
 560 
 561 /*
 562  * client->update_lock must be held when calling this function (unless we are
 563  * in detection or initialization steps), and while a remote channel other
 564  * than channel 0 is selected. Also, calling code must make sure to re-select
 565  * external channel 0 before releasing the lock. This is necessary because
 566  * various registers have different meanings as a result of selecting a
 567  * non-default remote channel.
 568  */
 569 static int lm90_select_remote_channel(struct lm90_data *data, int channel)
 570 {
 571         int err = 0;
 572 
 573         if (data->kind == max6696) {
 574                 u8 config = data->config & ~0x08;
 575 
 576                 if (channel)
 577                         config |= 0x08;
 578                 err = lm90_update_confreg(data, config);
 579         }
 580         return err;
 581 }
 582 
 583 static int lm90_write_convrate(struct lm90_data *data, int val)
 584 {
 585         u8 config = data->config;
 586         int err;
 587 
 588         /* Save config and pause conversion */
 589         if (data->flags & LM90_PAUSE_FOR_CONFIG) {
 590                 err = lm90_update_confreg(data, config | 0x40);
 591                 if (err < 0)
 592                         return err;
 593         }
 594 
 595         /* Set conv rate */
 596         err = i2c_smbus_write_byte_data(data->client, LM90_REG_W_CONVRATE, val);
 597 
 598         /* Revert change to config */
 599         lm90_update_confreg(data, config);
 600 
 601         return err;
 602 }
 603 
 604 /*
 605  * Set conversion rate.
 606  * client->update_lock must be held when calling this function (unless we are
 607  * in detection or initialization steps).
 608  */
 609 static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
 610                              unsigned int interval)
 611 {
 612         unsigned int update_interval;
 613         int i, err;
 614 
 615         /* Shift calculations to avoid rounding errors */
 616         interval <<= 6;
 617 
 618         /* find the nearest update rate */
 619         for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
 620              i < data->max_convrate; i++, update_interval >>= 1)
 621                 if (interval >= update_interval * 3 / 4)
 622                         break;
 623 
 624         err = lm90_write_convrate(data, i);
 625         data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
 626         return err;
 627 }
 628 
 629 static int lm90_update_limits(struct device *dev)
 630 {
 631         struct lm90_data *data = dev_get_drvdata(dev);
 632         struct i2c_client *client = data->client;
 633         int val;
 634 
 635         val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT);
 636         if (val < 0)
 637                 return val;
 638         data->temp8[LOCAL_CRIT] = val;
 639 
 640         val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
 641         if (val < 0)
 642                 return val;
 643         data->temp8[REMOTE_CRIT] = val;
 644 
 645         val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST);
 646         if (val < 0)
 647                 return val;
 648         data->temp_hyst = val;
 649 
 650         val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
 651         if (val < 0)
 652                 return val;
 653         data->temp11[REMOTE_LOW] = val << 8;
 654 
 655         if (data->flags & LM90_HAVE_REM_LIMIT_EXT) {
 656                 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL);
 657                 if (val < 0)
 658                         return val;
 659                 data->temp11[REMOTE_LOW] |= val;
 660         }
 661 
 662         val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH);
 663         if (val < 0)
 664                 return val;
 665         data->temp11[REMOTE_HIGH] = val << 8;
 666 
 667         if (data->flags & LM90_HAVE_REM_LIMIT_EXT) {
 668                 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL);
 669                 if (val < 0)
 670                         return val;
 671                 data->temp11[REMOTE_HIGH] |= val;
 672         }
 673 
 674         if (data->flags & LM90_HAVE_OFFSET) {
 675                 val = lm90_read16(client, LM90_REG_R_REMOTE_OFFSH,
 676                                   LM90_REG_R_REMOTE_OFFSL);
 677                 if (val < 0)
 678                         return val;
 679                 data->temp11[REMOTE_OFFSET] = val;
 680         }
 681 
 682         if (data->flags & LM90_HAVE_EMERGENCY) {
 683                 val = lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG);
 684                 if (val < 0)
 685                         return val;
 686                 data->temp8[LOCAL_EMERG] = val;
 687 
 688                 val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG);
 689                 if (val < 0)
 690                         return val;
 691                 data->temp8[REMOTE_EMERG] = val;
 692         }
 693 
 694         if (data->kind == max6696) {
 695                 val = lm90_select_remote_channel(data, 1);
 696                 if (val < 0)
 697                         return val;
 698 
 699                 val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
 700                 if (val < 0)
 701                         return val;
 702                 data->temp8[REMOTE2_CRIT] = val;
 703 
 704                 val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG);
 705                 if (val < 0)
 706                         return val;
 707                 data->temp8[REMOTE2_EMERG] = val;
 708 
 709                 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
 710                 if (val < 0)
 711                         return val;
 712                 data->temp11[REMOTE2_LOW] = val << 8;
 713 
 714                 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH);
 715                 if (val < 0)
 716                         return val;
 717                 data->temp11[REMOTE2_HIGH] = val << 8;
 718 
 719                 lm90_select_remote_channel(data, 0);
 720         }
 721 
 722         return 0;
 723 }
 724 
 725 static int lm90_update_device(struct device *dev)
 726 {
 727         struct lm90_data *data = dev_get_drvdata(dev);
 728         struct i2c_client *client = data->client;
 729         unsigned long next_update;
 730         int val;
 731 
 732         if (!data->valid) {
 733                 val = lm90_update_limits(dev);
 734                 if (val < 0)
 735                         return val;
 736         }
 737 
 738         next_update = data->last_updated +
 739                       msecs_to_jiffies(data->update_interval);
 740         if (time_after(jiffies, next_update) || !data->valid) {
 741                 dev_dbg(&client->dev, "Updating lm90 data.\n");
 742 
 743                 data->valid = false;
 744 
 745                 val = lm90_read_reg(client, LM90_REG_R_LOCAL_LOW);
 746                 if (val < 0)
 747                         return val;
 748                 data->temp8[LOCAL_LOW] = val;
 749 
 750                 val = lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH);
 751                 if (val < 0)
 752                         return val;
 753                 data->temp8[LOCAL_HIGH] = val;
 754 
 755                 if (data->reg_local_ext) {
 756                         val = lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
 757                                           data->reg_local_ext);
 758                         if (val < 0)
 759                                 return val;
 760                         data->temp11[LOCAL_TEMP] = val;
 761                 } else {
 762                         val = lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP);
 763                         if (val < 0)
 764                                 return val;
 765                         data->temp11[LOCAL_TEMP] = val << 8;
 766                 }
 767                 val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
 768                                   LM90_REG_R_REMOTE_TEMPL);
 769                 if (val < 0)
 770                         return val;
 771                 data->temp11[REMOTE_TEMP] = val;
 772 
 773                 val = lm90_read_reg(client, LM90_REG_R_STATUS);
 774                 if (val < 0)
 775                         return val;
 776                 data->alarms = val;     /* lower 8 bit of alarms */
 777 
 778                 if (data->kind == max6696) {
 779                         val = lm90_select_remote_channel(data, 1);
 780                         if (val < 0)
 781                                 return val;
 782 
 783                         val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
 784                                           LM90_REG_R_REMOTE_TEMPL);
 785                         if (val < 0) {
 786                                 lm90_select_remote_channel(data, 0);
 787                                 return val;
 788                         }
 789                         data->temp11[REMOTE2_TEMP] = val;
 790 
 791                         lm90_select_remote_channel(data, 0);
 792 
 793                         val = lm90_read_reg(client, MAX6696_REG_R_STATUS2);
 794                         if (val < 0)
 795                                 return val;
 796                         data->alarms |= val << 8;
 797                 }
 798 
 799                 /*
 800                  * Re-enable ALERT# output if it was originally enabled and
 801                  * relevant alarms are all clear
 802                  */
 803                 if (!(data->config_orig & 0x80) &&
 804                     !(data->alarms & data->alert_alarms)) {
 805                         if (data->config & 0x80) {
 806                                 dev_dbg(&client->dev, "Re-enabling ALERT#\n");
 807                                 lm90_update_confreg(data, data->config & ~0x80);
 808                         }
 809                 }
 810 
 811                 data->last_updated = jiffies;
 812                 data->valid = true;
 813         }
 814 
 815         return 0;
 816 }
 817 
 818 /*
 819  * Conversions
 820  * For local temperatures and limits, critical limits and the hysteresis
 821  * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
 822  * For remote temperatures and limits, it uses signed 11-bit values with
 823  * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.  Some
 824  * Maxim chips use unsigned values.
 825  */
 826 
 827 static inline int temp_from_s8(s8 val)
 828 {
 829         return val * 1000;
 830 }
 831 
 832 static inline int temp_from_u8(u8 val)
 833 {
 834         return val * 1000;
 835 }
 836 
 837 static inline int temp_from_s16(s16 val)
 838 {
 839         return val / 32 * 125;
 840 }
 841 
 842 static inline int temp_from_u16(u16 val)
 843 {
 844         return val / 32 * 125;
 845 }
 846 
 847 static s8 temp_to_s8(long val)
 848 {
 849         if (val <= -128000)
 850                 return -128;
 851         if (val >= 127000)
 852                 return 127;
 853         if (val < 0)
 854                 return (val - 500) / 1000;
 855         return (val + 500) / 1000;
 856 }
 857 
 858 static u8 temp_to_u8(long val)
 859 {
 860         if (val <= 0)
 861                 return 0;
 862         if (val >= 255000)
 863                 return 255;
 864         return (val + 500) / 1000;
 865 }
 866 
 867 static s16 temp_to_s16(long val)
 868 {
 869         if (val <= -128000)
 870                 return 0x8000;
 871         if (val >= 127875)
 872                 return 0x7FE0;
 873         if (val < 0)
 874                 return (val - 62) / 125 * 32;
 875         return (val + 62) / 125 * 32;
 876 }
 877 
 878 static u8 hyst_to_reg(long val)
 879 {
 880         if (val <= 0)
 881                 return 0;
 882         if (val >= 30500)
 883                 return 31;
 884         return (val + 500) / 1000;
 885 }
 886 
 887 /*
 888  * ADT7461 in compatibility mode is almost identical to LM90 except that
 889  * attempts to write values that are outside the range 0 < temp < 127 are
 890  * treated as the boundary value.
 891  *
 892  * ADT7461 in "extended mode" operation uses unsigned integers offset by
 893  * 64 (e.g., 0 -> -64 degC).  The range is restricted to -64..191 degC.
 894  */
 895 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
 896 {
 897         if (data->flags & LM90_FLAG_ADT7461_EXT)
 898                 return (val - 64) * 1000;
 899         return temp_from_s8(val);
 900 }
 901 
 902 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
 903 {
 904         if (data->flags & LM90_FLAG_ADT7461_EXT)
 905                 return (val - 0x4000) / 64 * 250;
 906         return temp_from_s16(val);
 907 }
 908 
 909 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
 910 {
 911         if (data->flags & LM90_FLAG_ADT7461_EXT) {
 912                 if (val <= -64000)
 913                         return 0;
 914                 if (val >= 191000)
 915                         return 0xFF;
 916                 return (val + 500 + 64000) / 1000;
 917         }
 918         if (val <= 0)
 919                 return 0;
 920         if (val >= 127000)
 921                 return 127;
 922         return (val + 500) / 1000;
 923 }
 924 
 925 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
 926 {
 927         if (data->flags & LM90_FLAG_ADT7461_EXT) {
 928                 if (val <= -64000)
 929                         return 0;
 930                 if (val >= 191750)
 931                         return 0xFFC0;
 932                 return (val + 64000 + 125) / 250 * 64;
 933         }
 934         if (val <= 0)
 935                 return 0;
 936         if (val >= 127750)
 937                 return 0x7FC0;
 938         return (val + 125) / 250 * 64;
 939 }
 940 
 941 /* pec used for ADM1032 only */
 942 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
 943                         char *buf)
 944 {
 945         struct i2c_client *client = to_i2c_client(dev);
 946 
 947         return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
 948 }
 949 
 950 static ssize_t pec_store(struct device *dev, struct device_attribute *dummy,
 951                          const char *buf, size_t count)
 952 {
 953         struct i2c_client *client = to_i2c_client(dev);
 954         long val;
 955         int err;
 956 
 957         err = kstrtol(buf, 10, &val);
 958         if (err < 0)
 959                 return err;
 960 
 961         switch (val) {
 962         case 0:
 963                 client->flags &= ~I2C_CLIENT_PEC;
 964                 break;
 965         case 1:
 966                 client->flags |= I2C_CLIENT_PEC;
 967                 break;
 968         default:
 969                 return -EINVAL;
 970         }
 971 
 972         return count;
 973 }
 974 
 975 static DEVICE_ATTR_RW(pec);
 976 
 977 static int lm90_get_temp11(struct lm90_data *data, int index)
 978 {
 979         s16 temp11 = data->temp11[index];
 980         int temp;
 981 
 982         if (data->kind == adt7461 || data->kind == tmp451)
 983                 temp = temp_from_u16_adt7461(data, temp11);
 984         else if (data->kind == max6646)
 985                 temp = temp_from_u16(temp11);
 986         else
 987                 temp = temp_from_s16(temp11);
 988 
 989         /* +16 degrees offset for temp2 for the LM99 */
 990         if (data->kind == lm99 && index <= 2)
 991                 temp += 16000;
 992 
 993         return temp;
 994 }
 995 
 996 static int lm90_set_temp11(struct lm90_data *data, int index, long val)
 997 {
 998         static struct reg {
 999                 u8 high;
1000                 u8 low;
1001         } reg[] = {
1002         [REMOTE_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL },
1003         [REMOTE_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL },
1004         [REMOTE_OFFSET] = { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL },
1005         [REMOTE2_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL },
1006         [REMOTE2_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL }
1007         };
1008         struct i2c_client *client = data->client;
1009         struct reg *regp = &reg[index];
1010         int err;
1011 
1012         /* +16 degrees offset for temp2 for the LM99 */
1013         if (data->kind == lm99 && index <= 2)
1014                 val -= 16000;
1015 
1016         if (data->kind == adt7461 || data->kind == tmp451)
1017                 data->temp11[index] = temp_to_u16_adt7461(data, val);
1018         else if (data->kind == max6646)
1019                 data->temp11[index] = temp_to_u8(val) << 8;
1020         else if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
1021                 data->temp11[index] = temp_to_s16(val);
1022         else
1023                 data->temp11[index] = temp_to_s8(val) << 8;
1024 
1025         lm90_select_remote_channel(data, index >= 3);
1026         err = i2c_smbus_write_byte_data(client, regp->high,
1027                                   data->temp11[index] >> 8);
1028         if (err < 0)
1029                 return err;
1030         if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
1031                 err = i2c_smbus_write_byte_data(client, regp->low,
1032                                                 data->temp11[index] & 0xff);
1033 
1034         lm90_select_remote_channel(data, 0);
1035         return err;
1036 }
1037 
1038 static int lm90_get_temp8(struct lm90_data *data, int index)
1039 {
1040         s8 temp8 = data->temp8[index];
1041         int temp;
1042 
1043         if (data->kind == adt7461 || data->kind == tmp451)
1044                 temp = temp_from_u8_adt7461(data, temp8);
1045         else if (data->kind == max6646)
1046                 temp = temp_from_u8(temp8);
1047         else
1048                 temp = temp_from_s8(temp8);
1049 
1050         /* +16 degrees offset for temp2 for the LM99 */
1051         if (data->kind == lm99 && index == 3)
1052                 temp += 16000;
1053 
1054         return temp;
1055 }
1056 
1057 static int lm90_set_temp8(struct lm90_data *data, int index, long val)
1058 {
1059         static const u8 reg[TEMP8_REG_NUM] = {
1060                 LM90_REG_W_LOCAL_LOW,
1061                 LM90_REG_W_LOCAL_HIGH,
1062                 LM90_REG_W_LOCAL_CRIT,
1063                 LM90_REG_W_REMOTE_CRIT,
1064                 MAX6659_REG_W_LOCAL_EMERG,
1065                 MAX6659_REG_W_REMOTE_EMERG,
1066                 LM90_REG_W_REMOTE_CRIT,
1067                 MAX6659_REG_W_REMOTE_EMERG,
1068         };
1069         struct i2c_client *client = data->client;
1070         int err;
1071 
1072         /* +16 degrees offset for temp2 for the LM99 */
1073         if (data->kind == lm99 && index == 3)
1074                 val -= 16000;
1075 
1076         if (data->kind == adt7461 || data->kind == tmp451)
1077                 data->temp8[index] = temp_to_u8_adt7461(data, val);
1078         else if (data->kind == max6646)
1079                 data->temp8[index] = temp_to_u8(val);
1080         else
1081                 data->temp8[index] = temp_to_s8(val);
1082 
1083         lm90_select_remote_channel(data, index >= 6);
1084         err = i2c_smbus_write_byte_data(client, reg[index], data->temp8[index]);
1085         lm90_select_remote_channel(data, 0);
1086 
1087         return err;
1088 }
1089 
1090 static int lm90_get_temphyst(struct lm90_data *data, int index)
1091 {
1092         int temp;
1093 
1094         if (data->kind == adt7461 || data->kind == tmp451)
1095                 temp = temp_from_u8_adt7461(data, data->temp8[index]);
1096         else if (data->kind == max6646)
1097                 temp = temp_from_u8(data->temp8[index]);
1098         else
1099                 temp = temp_from_s8(data->temp8[index]);
1100 
1101         /* +16 degrees offset for temp2 for the LM99 */
1102         if (data->kind == lm99 && index == 3)
1103                 temp += 16000;
1104 
1105         return temp - temp_from_s8(data->temp_hyst);
1106 }
1107 
1108 static int lm90_set_temphyst(struct lm90_data *data, long val)
1109 {
1110         struct i2c_client *client = data->client;
1111         int temp;
1112         int err;
1113 
1114         if (data->kind == adt7461 || data->kind == tmp451)
1115                 temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]);
1116         else if (data->kind == max6646)
1117                 temp = temp_from_u8(data->temp8[LOCAL_CRIT]);
1118         else
1119                 temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
1120 
1121         data->temp_hyst = hyst_to_reg(temp - val);
1122         err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
1123                                         data->temp_hyst);
1124         return err;
1125 }
1126 
1127 static const u8 lm90_temp_index[3] = {
1128         LOCAL_TEMP, REMOTE_TEMP, REMOTE2_TEMP
1129 };
1130 
1131 static const u8 lm90_temp_min_index[3] = {
1132         LOCAL_LOW, REMOTE_LOW, REMOTE2_LOW
1133 };
1134 
1135 static const u8 lm90_temp_max_index[3] = {
1136         LOCAL_HIGH, REMOTE_HIGH, REMOTE2_HIGH
1137 };
1138 
1139 static const u8 lm90_temp_crit_index[3] = {
1140         LOCAL_CRIT, REMOTE_CRIT, REMOTE2_CRIT
1141 };
1142 
1143 static const u8 lm90_temp_emerg_index[3] = {
1144         LOCAL_EMERG, REMOTE_EMERG, REMOTE2_EMERG
1145 };
1146 
1147 static const u8 lm90_min_alarm_bits[3] = { 5, 3, 11 };
1148 static const u8 lm90_max_alarm_bits[3] = { 6, 4, 12 };
1149 static const u8 lm90_crit_alarm_bits[3] = { 0, 1, 9 };
1150 static const u8 lm90_emergency_alarm_bits[3] = { 15, 13, 14 };
1151 static const u8 lm90_fault_bits[3] = { 0, 2, 10 };
1152 
1153 static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val)
1154 {
1155         struct lm90_data *data = dev_get_drvdata(dev);
1156         int err;
1157 
1158         mutex_lock(&data->update_lock);
1159         err = lm90_update_device(dev);
1160         mutex_unlock(&data->update_lock);
1161         if (err)
1162                 return err;
1163 
1164         switch (attr) {
1165         case hwmon_temp_input:
1166                 *val = lm90_get_temp11(data, lm90_temp_index[channel]);
1167                 break;
1168         case hwmon_temp_min_alarm:
1169                 *val = (data->alarms >> lm90_min_alarm_bits[channel]) & 1;
1170                 break;
1171         case hwmon_temp_max_alarm:
1172                 *val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1;
1173                 break;
1174         case hwmon_temp_crit_alarm:
1175                 *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1;
1176                 break;
1177         case hwmon_temp_emergency_alarm:
1178                 *val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1;
1179                 break;
1180         case hwmon_temp_fault:
1181                 *val = (data->alarms >> lm90_fault_bits[channel]) & 1;
1182                 break;
1183         case hwmon_temp_min:
1184                 if (channel == 0)
1185                         *val = lm90_get_temp8(data,
1186                                               lm90_temp_min_index[channel]);
1187                 else
1188                         *val = lm90_get_temp11(data,
1189                                                lm90_temp_min_index[channel]);
1190                 break;
1191         case hwmon_temp_max:
1192                 if (channel == 0)
1193                         *val = lm90_get_temp8(data,
1194                                               lm90_temp_max_index[channel]);
1195                 else
1196                         *val = lm90_get_temp11(data,
1197                                                lm90_temp_max_index[channel]);
1198                 break;
1199         case hwmon_temp_crit:
1200                 *val = lm90_get_temp8(data, lm90_temp_crit_index[channel]);
1201                 break;
1202         case hwmon_temp_crit_hyst:
1203                 *val = lm90_get_temphyst(data, lm90_temp_crit_index[channel]);
1204                 break;
1205         case hwmon_temp_emergency:
1206                 *val = lm90_get_temp8(data, lm90_temp_emerg_index[channel]);
1207                 break;
1208         case hwmon_temp_emergency_hyst:
1209                 *val = lm90_get_temphyst(data, lm90_temp_emerg_index[channel]);
1210                 break;
1211         case hwmon_temp_offset:
1212                 *val = lm90_get_temp11(data, REMOTE_OFFSET);
1213                 break;
1214         default:
1215                 return -EOPNOTSUPP;
1216         }
1217         return 0;
1218 }
1219 
1220 static int lm90_temp_write(struct device *dev, u32 attr, int channel, long val)
1221 {
1222         struct lm90_data *data = dev_get_drvdata(dev);
1223         int err;
1224 
1225         mutex_lock(&data->update_lock);
1226 
1227         err = lm90_update_device(dev);
1228         if (err)
1229                 goto error;
1230 
1231         switch (attr) {
1232         case hwmon_temp_min:
1233                 if (channel == 0)
1234                         err = lm90_set_temp8(data,
1235                                               lm90_temp_min_index[channel],
1236                                               val);
1237                 else
1238                         err = lm90_set_temp11(data,
1239                                               lm90_temp_min_index[channel],
1240                                               val);
1241                 break;
1242         case hwmon_temp_max:
1243                 if (channel == 0)
1244                         err = lm90_set_temp8(data,
1245                                              lm90_temp_max_index[channel],
1246                                              val);
1247                 else
1248                         err = lm90_set_temp11(data,
1249                                               lm90_temp_max_index[channel],
1250                                               val);
1251                 break;
1252         case hwmon_temp_crit:
1253                 err = lm90_set_temp8(data, lm90_temp_crit_index[channel], val);
1254                 break;
1255         case hwmon_temp_crit_hyst:
1256                 err = lm90_set_temphyst(data, val);
1257                 break;
1258         case hwmon_temp_emergency:
1259                 err = lm90_set_temp8(data, lm90_temp_emerg_index[channel], val);
1260                 break;
1261         case hwmon_temp_offset:
1262                 err = lm90_set_temp11(data, REMOTE_OFFSET, val);
1263                 break;
1264         default:
1265                 err = -EOPNOTSUPP;
1266                 break;
1267         }
1268 error:
1269         mutex_unlock(&data->update_lock);
1270 
1271         return err;
1272 }
1273 
1274 static umode_t lm90_temp_is_visible(const void *data, u32 attr, int channel)
1275 {
1276         switch (attr) {
1277         case hwmon_temp_input:
1278         case hwmon_temp_min_alarm:
1279         case hwmon_temp_max_alarm:
1280         case hwmon_temp_crit_alarm:
1281         case hwmon_temp_emergency_alarm:
1282         case hwmon_temp_emergency_hyst:
1283         case hwmon_temp_fault:
1284                 return 0444;
1285         case hwmon_temp_min:
1286         case hwmon_temp_max:
1287         case hwmon_temp_crit:
1288         case hwmon_temp_emergency:
1289         case hwmon_temp_offset:
1290                 return 0644;
1291         case hwmon_temp_crit_hyst:
1292                 if (channel == 0)
1293                         return 0644;
1294                 return 0444;
1295         default:
1296                 return 0;
1297         }
1298 }
1299 
1300 static int lm90_chip_read(struct device *dev, u32 attr, int channel, long *val)
1301 {
1302         struct lm90_data *data = dev_get_drvdata(dev);
1303         int err;
1304 
1305         mutex_lock(&data->update_lock);
1306         err = lm90_update_device(dev);
1307         mutex_unlock(&data->update_lock);
1308         if (err)
1309                 return err;
1310 
1311         switch (attr) {
1312         case hwmon_chip_update_interval:
1313                 *val = data->update_interval;
1314                 break;
1315         case hwmon_chip_alarms:
1316                 *val = data->alarms;
1317                 break;
1318         default:
1319                 return -EOPNOTSUPP;
1320         }
1321 
1322         return 0;
1323 }
1324 
1325 static int lm90_chip_write(struct device *dev, u32 attr, int channel, long val)
1326 {
1327         struct lm90_data *data = dev_get_drvdata(dev);
1328         struct i2c_client *client = data->client;
1329         int err;
1330 
1331         mutex_lock(&data->update_lock);
1332 
1333         err = lm90_update_device(dev);
1334         if (err)
1335                 goto error;
1336 
1337         switch (attr) {
1338         case hwmon_chip_update_interval:
1339                 err = lm90_set_convrate(client, data,
1340                                         clamp_val(val, 0, 100000));
1341                 break;
1342         default:
1343                 err = -EOPNOTSUPP;
1344                 break;
1345         }
1346 error:
1347         mutex_unlock(&data->update_lock);
1348 
1349         return err;
1350 }
1351 
1352 static umode_t lm90_chip_is_visible(const void *data, u32 attr, int channel)
1353 {
1354         switch (attr) {
1355         case hwmon_chip_update_interval:
1356                 return 0644;
1357         case hwmon_chip_alarms:
1358                 return 0444;
1359         default:
1360                 return 0;
1361         }
1362 }
1363 
1364 static int lm90_read(struct device *dev, enum hwmon_sensor_types type,
1365                      u32 attr, int channel, long *val)
1366 {
1367         switch (type) {
1368         case hwmon_chip:
1369                 return lm90_chip_read(dev, attr, channel, val);
1370         case hwmon_temp:
1371                 return lm90_temp_read(dev, attr, channel, val);
1372         default:
1373                 return -EOPNOTSUPP;
1374         }
1375 }
1376 
1377 static int lm90_write(struct device *dev, enum hwmon_sensor_types type,
1378                       u32 attr, int channel, long val)
1379 {
1380         switch (type) {
1381         case hwmon_chip:
1382                 return lm90_chip_write(dev, attr, channel, val);
1383         case hwmon_temp:
1384                 return lm90_temp_write(dev, attr, channel, val);
1385         default:
1386                 return -EOPNOTSUPP;
1387         }
1388 }
1389 
1390 static umode_t lm90_is_visible(const void *data, enum hwmon_sensor_types type,
1391                                u32 attr, int channel)
1392 {
1393         switch (type) {
1394         case hwmon_chip:
1395                 return lm90_chip_is_visible(data, attr, channel);
1396         case hwmon_temp:
1397                 return lm90_temp_is_visible(data, attr, channel);
1398         default:
1399                 return 0;
1400         }
1401 }
1402 
1403 /* Return 0 if detection is successful, -ENODEV otherwise */
1404 static int lm90_detect(struct i2c_client *client,
1405                        struct i2c_board_info *info)
1406 {
1407         struct i2c_adapter *adapter = client->adapter;
1408         int address = client->addr;
1409         const char *name = NULL;
1410         int man_id, chip_id, config1, config2, convrate;
1411 
1412         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1413                 return -ENODEV;
1414 
1415         /* detection and identification */
1416         man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID);
1417         chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID);
1418         config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
1419         convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE);
1420         if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0)
1421                 return -ENODEV;
1422 
1423         if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) {
1424                 config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2);
1425                 if (config2 < 0)
1426                         return -ENODEV;
1427         } else
1428                 config2 = 0;            /* Make compiler happy */
1429 
1430         if ((address == 0x4C || address == 0x4D)
1431          && man_id == 0x01) { /* National Semiconductor */
1432                 if ((config1 & 0x2A) == 0x00
1433                  && (config2 & 0xF8) == 0x00
1434                  && convrate <= 0x09) {
1435                         if (address == 0x4C
1436                          && (chip_id & 0xF0) == 0x20) { /* LM90 */
1437                                 name = "lm90";
1438                         } else
1439                         if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
1440                                 name = "lm99";
1441                                 dev_info(&adapter->dev,
1442                                          "Assuming LM99 chip at 0x%02x\n",
1443                                          address);
1444                                 dev_info(&adapter->dev,
1445                                          "If it is an LM89, instantiate it "
1446                                          "with the new_device sysfs "
1447                                          "interface\n");
1448                         } else
1449                         if (address == 0x4C
1450                          && (chip_id & 0xF0) == 0x10) { /* LM86 */
1451                                 name = "lm86";
1452                         }
1453                 }
1454         } else
1455         if ((address == 0x4C || address == 0x4D)
1456          && man_id == 0x41) { /* Analog Devices */
1457                 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
1458                  && (config1 & 0x3F) == 0x00
1459                  && convrate <= 0x0A) {
1460                         name = "adm1032";
1461                         /*
1462                          * The ADM1032 supports PEC, but only if combined
1463                          * transactions are not used.
1464                          */
1465                         if (i2c_check_functionality(adapter,
1466                                                     I2C_FUNC_SMBUS_BYTE))
1467                                 info->flags |= I2C_CLIENT_PEC;
1468                 } else
1469                 if (chip_id == 0x51 /* ADT7461 */
1470                  && (config1 & 0x1B) == 0x00
1471                  && convrate <= 0x0A) {
1472                         name = "adt7461";
1473                 } else
1474                 if (chip_id == 0x57 /* ADT7461A, NCT1008 */
1475                  && (config1 & 0x1B) == 0x00
1476                  && convrate <= 0x0A) {
1477                         name = "adt7461a";
1478                 }
1479         } else
1480         if (man_id == 0x4D) { /* Maxim */
1481                 int emerg, emerg2, status2;
1482 
1483                 /*
1484                  * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read
1485                  * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG
1486                  * exists, both readings will reflect the same value. Otherwise,
1487                  * the readings will be different.
1488                  */
1489                 emerg = i2c_smbus_read_byte_data(client,
1490                                                  MAX6659_REG_R_REMOTE_EMERG);
1491                 man_id = i2c_smbus_read_byte_data(client,
1492                                                   LM90_REG_R_MAN_ID);
1493                 emerg2 = i2c_smbus_read_byte_data(client,
1494                                                   MAX6659_REG_R_REMOTE_EMERG);
1495                 status2 = i2c_smbus_read_byte_data(client,
1496                                                    MAX6696_REG_R_STATUS2);
1497                 if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0)
1498                         return -ENODEV;
1499 
1500                 /*
1501                  * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
1502                  * register. Reading from that address will return the last
1503                  * read value, which in our case is those of the man_id
1504                  * register. Likewise, the config1 register seems to lack a
1505                  * low nibble, so the value will be those of the previous
1506                  * read, so in our case those of the man_id register.
1507                  * MAX6659 has a third set of upper temperature limit registers.
1508                  * Those registers also return values on MAX6657 and MAX6658,
1509                  * thus the only way to detect MAX6659 is by its address.
1510                  * For this reason it will be mis-detected as MAX6657 if its
1511                  * address is 0x4C.
1512                  */
1513                 if (chip_id == man_id
1514                  && (address == 0x4C || address == 0x4D || address == 0x4E)
1515                  && (config1 & 0x1F) == (man_id & 0x0F)
1516                  && convrate <= 0x09) {
1517                         if (address == 0x4C)
1518                                 name = "max6657";
1519                         else
1520                                 name = "max6659";
1521                 } else
1522                 /*
1523                  * Even though MAX6695 and MAX6696 do not have a chip ID
1524                  * register, reading it returns 0x01. Bit 4 of the config1
1525                  * register is unused and should return zero when read. Bit 0 of
1526                  * the status2 register is unused and should return zero when
1527                  * read.
1528                  *
1529                  * MAX6695 and MAX6696 have an additional set of temperature
1530                  * limit registers. We can detect those chips by checking if
1531                  * one of those registers exists.
1532                  */
1533                 if (chip_id == 0x01
1534                  && (config1 & 0x10) == 0x00
1535                  && (status2 & 0x01) == 0x00
1536                  && emerg == emerg2
1537                  && convrate <= 0x07) {
1538                         name = "max6696";
1539                 } else
1540                 /*
1541                  * The chip_id register of the MAX6680 and MAX6681 holds the
1542                  * revision of the chip. The lowest bit of the config1 register
1543                  * is unused and should return zero when read, so should the
1544                  * second to last bit of config1 (software reset).
1545                  */
1546                 if (chip_id == 0x01
1547                  && (config1 & 0x03) == 0x00
1548                  && convrate <= 0x07) {
1549                         name = "max6680";
1550                 } else
1551                 /*
1552                  * The chip_id register of the MAX6646/6647/6649 holds the
1553                  * revision of the chip. The lowest 6 bits of the config1
1554                  * register are unused and should return zero when read.
1555                  */
1556                 if (chip_id == 0x59
1557                  && (config1 & 0x3f) == 0x00
1558                  && convrate <= 0x07) {
1559                         name = "max6646";
1560                 }
1561         } else
1562         if (address == 0x4C
1563          && man_id == 0x5C) { /* Winbond/Nuvoton */
1564                 if ((config1 & 0x2A) == 0x00
1565                  && (config2 & 0xF8) == 0x00) {
1566                         if (chip_id == 0x01 /* W83L771W/G */
1567                          && convrate <= 0x09) {
1568                                 name = "w83l771";
1569                         } else
1570                         if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */
1571                          && convrate <= 0x08) {
1572                                 name = "w83l771";
1573                         }
1574                 }
1575         } else
1576         if (address >= 0x48 && address <= 0x4F
1577          && man_id == 0xA1) { /*  NXP Semiconductor/Philips */
1578                 if (chip_id == 0x00
1579                  && (config1 & 0x2A) == 0x00
1580                  && (config2 & 0xFE) == 0x00
1581                  && convrate <= 0x09) {
1582                         name = "sa56004";
1583                 }
1584         } else
1585         if ((address == 0x4C || address == 0x4D)
1586          && man_id == 0x47) { /* GMT */
1587                 if (chip_id == 0x01 /* G781 */
1588                  && (config1 & 0x3F) == 0x00
1589                  && convrate <= 0x08)
1590                         name = "g781";
1591         } else
1592         if (address == 0x4C
1593          && man_id == 0x55) { /* Texas Instruments */
1594                 int local_ext;
1595 
1596                 local_ext = i2c_smbus_read_byte_data(client,
1597                                                      TMP451_REG_R_LOCAL_TEMPL);
1598 
1599                 if (chip_id == 0x00 /* TMP451 */
1600                  && (config1 & 0x1B) == 0x00
1601                  && convrate <= 0x09
1602                  && (local_ext & 0x0F) == 0x00)
1603                         name = "tmp451";
1604         }
1605 
1606         if (!name) { /* identification failed */
1607                 dev_dbg(&adapter->dev,
1608                         "Unsupported chip at 0x%02x (man_id=0x%02X, "
1609                         "chip_id=0x%02X)\n", address, man_id, chip_id);
1610                 return -ENODEV;
1611         }
1612 
1613         strlcpy(info->type, name, I2C_NAME_SIZE);
1614 
1615         return 0;
1616 }
1617 
1618 static void lm90_restore_conf(void *_data)
1619 {
1620         struct lm90_data *data = _data;
1621         struct i2c_client *client = data->client;
1622 
1623         /* Restore initial configuration */
1624         lm90_write_convrate(data, data->convrate_orig);
1625         i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1626                                   data->config_orig);
1627 }
1628 
1629 static int lm90_init_client(struct i2c_client *client, struct lm90_data *data)
1630 {
1631         int config, convrate;
1632 
1633         convrate = lm90_read_reg(client, LM90_REG_R_CONVRATE);
1634         if (convrate < 0)
1635                 return convrate;
1636         data->convrate_orig = convrate;
1637 
1638         /*
1639          * Start the conversions.
1640          */
1641         config = lm90_read_reg(client, LM90_REG_R_CONFIG1);
1642         if (config < 0)
1643                 return config;
1644         data->config_orig = config;
1645         data->config = config;
1646 
1647         lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
1648 
1649         /* Check Temperature Range Select */
1650         if (data->kind == adt7461 || data->kind == tmp451) {
1651                 if (config & 0x04)
1652                         data->flags |= LM90_FLAG_ADT7461_EXT;
1653         }
1654 
1655         /*
1656          * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
1657          * 0.125 degree resolution) and range (0x08, extend range
1658          * to -64 degree) mode for the remote temperature sensor.
1659          */
1660         if (data->kind == max6680)
1661                 config |= 0x18;
1662 
1663         /*
1664          * Select external channel 0 for max6695/96
1665          */
1666         if (data->kind == max6696)
1667                 config &= ~0x08;
1668 
1669         config &= 0xBF; /* run */
1670         lm90_update_confreg(data, config);
1671 
1672         return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data);
1673 }
1674 
1675 static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
1676 {
1677         struct lm90_data *data = i2c_get_clientdata(client);
1678         int st, st2 = 0;
1679 
1680         st = lm90_read_reg(client, LM90_REG_R_STATUS);
1681         if (st < 0)
1682                 return false;
1683 
1684         if (data->kind == max6696) {
1685                 st2 = lm90_read_reg(client, MAX6696_REG_R_STATUS2);
1686                 if (st2 < 0)
1687                         return false;
1688         }
1689 
1690         *status = st | (st2 << 8);
1691 
1692         if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0)
1693                 return false;
1694 
1695         if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
1696             (st2 & MAX6696_STATUS2_LOT2))
1697                 dev_warn(&client->dev,
1698                          "temp%d out of range, please check!\n", 1);
1699         if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
1700             (st2 & MAX6696_STATUS2_ROT2))
1701                 dev_warn(&client->dev,
1702                          "temp%d out of range, please check!\n", 2);
1703         if (st & LM90_STATUS_ROPEN)
1704                 dev_warn(&client->dev,
1705                          "temp%d diode open, please check!\n", 2);
1706         if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
1707                    MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
1708                 dev_warn(&client->dev,
1709                          "temp%d out of range, please check!\n", 3);
1710         if (st2 & MAX6696_STATUS2_R2OPEN)
1711                 dev_warn(&client->dev,
1712                          "temp%d diode open, please check!\n", 3);
1713 
1714         return true;
1715 }
1716 
1717 static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
1718 {
1719         struct i2c_client *client = dev_id;
1720         u16 status;
1721 
1722         if (lm90_is_tripped(client, &status))
1723                 return IRQ_HANDLED;
1724         else
1725                 return IRQ_NONE;
1726 }
1727 
1728 static void lm90_remove_pec(void *dev)
1729 {
1730         device_remove_file(dev, &dev_attr_pec);
1731 }
1732 
1733 static void lm90_regulator_disable(void *regulator)
1734 {
1735         regulator_disable(regulator);
1736 }
1737 
1738 
1739 static const struct hwmon_ops lm90_ops = {
1740         .is_visible = lm90_is_visible,
1741         .read = lm90_read,
1742         .write = lm90_write,
1743 };
1744 
1745 static int lm90_probe(struct i2c_client *client,
1746                       const struct i2c_device_id *id)
1747 {
1748         struct device *dev = &client->dev;
1749         struct i2c_adapter *adapter = client->adapter;
1750         struct hwmon_channel_info *info;
1751         struct regulator *regulator;
1752         struct device *hwmon_dev;
1753         struct lm90_data *data;
1754         int err;
1755 
1756         regulator = devm_regulator_get(dev, "vcc");
1757         if (IS_ERR(regulator))
1758                 return PTR_ERR(regulator);
1759 
1760         err = regulator_enable(regulator);
1761         if (err < 0) {
1762                 dev_err(dev, "Failed to enable regulator: %d\n", err);
1763                 return err;
1764         }
1765 
1766         err = devm_add_action_or_reset(dev, lm90_regulator_disable, regulator);
1767         if (err)
1768                 return err;
1769 
1770         data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL);
1771         if (!data)
1772                 return -ENOMEM;
1773 
1774         data->client = client;
1775         i2c_set_clientdata(client, data);
1776         mutex_init(&data->update_lock);
1777 
1778         /* Set the device type */
1779         if (client->dev.of_node)
1780                 data->kind = (enum chips)of_device_get_match_data(&client->dev);
1781         else
1782                 data->kind = id->driver_data;
1783         if (data->kind == adm1032) {
1784                 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
1785                         client->flags &= ~I2C_CLIENT_PEC;
1786         }
1787 
1788         /*
1789          * Different devices have different alarm bits triggering the
1790          * ALERT# output
1791          */
1792         data->alert_alarms = lm90_params[data->kind].alert_alarms;
1793 
1794         /* Set chip capabilities */
1795         data->flags = lm90_params[data->kind].flags;
1796 
1797         data->chip.ops = &lm90_ops;
1798         data->chip.info = data->info;
1799 
1800         data->info[0] = HWMON_CHANNEL_INFO(chip,
1801                 HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL | HWMON_C_ALARMS);
1802         data->info[1] = &data->temp_info;
1803 
1804         info = &data->temp_info;
1805         info->type = hwmon_temp;
1806         info->config = data->channel_config;
1807 
1808         data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
1809                 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
1810                 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM;
1811         data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
1812                 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
1813                 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
1814 
1815         if (data->flags & LM90_HAVE_OFFSET)
1816                 data->channel_config[1] |= HWMON_T_OFFSET;
1817 
1818         if (data->flags & LM90_HAVE_EMERGENCY) {
1819                 data->channel_config[0] |= HWMON_T_EMERGENCY |
1820                         HWMON_T_EMERGENCY_HYST;
1821                 data->channel_config[1] |= HWMON_T_EMERGENCY |
1822                         HWMON_T_EMERGENCY_HYST;
1823         }
1824 
1825         if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
1826                 data->channel_config[0] |= HWMON_T_EMERGENCY_ALARM;
1827                 data->channel_config[1] |= HWMON_T_EMERGENCY_ALARM;
1828         }
1829 
1830         if (data->flags & LM90_HAVE_TEMP3) {
1831                 data->channel_config[2] = HWMON_T_INPUT |
1832                         HWMON_T_MIN | HWMON_T_MAX |
1833                         HWMON_T_CRIT | HWMON_T_CRIT_HYST |
1834                         HWMON_T_EMERGENCY | HWMON_T_EMERGENCY_HYST |
1835                         HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
1836                         HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY_ALARM |
1837                         HWMON_T_FAULT;
1838         }
1839 
1840         data->reg_local_ext = lm90_params[data->kind].reg_local_ext;
1841 
1842         /* Set maximum conversion rate */
1843         data->max_convrate = lm90_params[data->kind].max_convrate;
1844 
1845         /* Initialize the LM90 chip */
1846         err = lm90_init_client(client, data);
1847         if (err < 0) {
1848                 dev_err(dev, "Failed to initialize device\n");
1849                 return err;
1850         }
1851 
1852         /*
1853          * The 'pec' attribute is attached to the i2c device and thus created
1854          * separately.
1855          */
1856         if (client->flags & I2C_CLIENT_PEC) {
1857                 err = device_create_file(dev, &dev_attr_pec);
1858                 if (err)
1859                         return err;
1860                 err = devm_add_action_or_reset(dev, lm90_remove_pec, dev);
1861                 if (err)
1862                         return err;
1863         }
1864 
1865         hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
1866                                                          data, &data->chip,
1867                                                          NULL);
1868         if (IS_ERR(hwmon_dev))
1869                 return PTR_ERR(hwmon_dev);
1870 
1871         if (client->irq) {
1872                 dev_dbg(dev, "IRQ: %d\n", client->irq);
1873                 err = devm_request_threaded_irq(dev, client->irq,
1874                                                 NULL, lm90_irq_thread,
1875                                                 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1876                                                 "lm90", client);
1877                 if (err < 0) {
1878                         dev_err(dev, "cannot request IRQ %d\n", client->irq);
1879                         return err;
1880                 }
1881         }
1882 
1883         return 0;
1884 }
1885 
1886 static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
1887                        unsigned int flag)
1888 {
1889         u16 alarms;
1890 
1891         if (type != I2C_PROTOCOL_SMBUS_ALERT)
1892                 return;
1893 
1894         if (lm90_is_tripped(client, &alarms)) {
1895                 /*
1896                  * Disable ALERT# output, because these chips don't implement
1897                  * SMBus alert correctly; they should only hold the alert line
1898                  * low briefly.
1899                  */
1900                 struct lm90_data *data = i2c_get_clientdata(client);
1901 
1902                 if ((data->flags & LM90_HAVE_BROKEN_ALERT) &&
1903                     (alarms & data->alert_alarms)) {
1904                         dev_dbg(&client->dev, "Disabling ALERT#\n");
1905                         lm90_update_confreg(data, data->config | 0x80);
1906                 }
1907         } else {
1908                 dev_info(&client->dev, "Everything OK\n");
1909         }
1910 }
1911 
1912 static struct i2c_driver lm90_driver = {
1913         .class          = I2C_CLASS_HWMON,
1914         .driver = {
1915                 .name   = "lm90",
1916                 .of_match_table = of_match_ptr(lm90_of_match),
1917         },
1918         .probe          = lm90_probe,
1919         .alert          = lm90_alert,
1920         .id_table       = lm90_id,
1921         .detect         = lm90_detect,
1922         .address_list   = normal_i2c,
1923 };
1924 
1925 module_i2c_driver(lm90_driver);
1926 
1927 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
1928 MODULE_DESCRIPTION("LM90/ADM1032 driver");
1929 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/hwmon/lm90.c

DEFINITIONS
