drivers/hwmon/it87.c

   1 /*
   2     it87.c - Part of lm_sensors, Linux kernel modules for hardware
   3              monitoring.
   4
   5     The IT8705F is an LPC-based Super I/O part that contains UARTs, a
   6     parallel port, an IR port, a MIDI port, a floppy controller, etc., in
   7     addition to an Environment Controller (Enhanced Hardware Monitor and
   8     Fan Controller)
   9
  10     This driver supports only the Environment Controller in the IT8705F and
  11     similar parts.  The other devices are supported by different drivers.
  12
  13     Supports: IT8705F  Super I/O chip w/LPC interface
  14               IT8712F  Super I/O chip w/LPC interface
  15               IT8716F  Super I/O chip w/LPC interface
  16               IT8718F  Super I/O chip w/LPC interface
  17               IT8720F  Super I/O chip w/LPC interface
  18               IT8726F  Super I/O chip w/LPC interface
  19               Sis950   A clone of the IT8705F
  20
  21     Copyright (C) 2001 Chris Gauthron
  22     Copyright (C) 2005-2007 Jean Delvare <khali@linux-fr.org>
  23
  24     This program is free software; you can redistribute it and/or modify
  25     it under the terms of the GNU General Public License as published by
  26     the Free Software Foundation; either version 2 of the License, or
  27     (at your option) any later version.
  28
  29     This program is distributed in the hope that it will be useful,
  30     but WITHOUT ANY WARRANTY; without even the implied warranty of
  31     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32     GNU General Public License for more details.
  33
  34     You should have received a copy of the GNU General Public License
  35     along with this program; if not, write to the Free Software
  36     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  37 */
  38
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/jiffies.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/hwmon.h>
  45 #include <linux/hwmon-sysfs.h>
  46 #include <linux/hwmon-vid.h>
  47 #include <linux/err.h>
  48 #include <linux/mutex.h>
  49 #include <linux/sysfs.h>
  50 #include <linux/string.h>
  51 #include <linux/dmi.h>
  52 #include <linux/acpi.h>
  53 #include <asm/io.h>
  54
  55 #define DRVNAME "it87"
  56
  57 enum chips { it87, it8712, it8716, it8718, it8720 };
  58
  59 static unsigned short force_id;
  60 module_param(force_id, ushort, 0);
  61 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  62
  63 static struct platform_device *pdev;
  64
  65 #define REG     0x2e    /* The register to read/write */
  66 #define DEV     0x07    /* Register: Logical device select */
  67 #define VAL     0x2f    /* The value to read/write */
  68 #define PME     0x04    /* The device with the fan registers in it */
  69
  70 /* The device with the IT8718F/IT8720F VID value in it */
  71 #define GPIO    0x07
  72
  73 #define DEVID   0x20    /* Register: Device ID */
  74 #define DEVREV  0x22    /* Register: Device Revision */
  75
  76 static inline int
  77 superio_inb(int reg)
  78 {
  79         outb(reg, REG);
  80         return inb(VAL);
  81 }
  82
  83 static int superio_inw(int reg)
  84 {
  85         int val;
  86         outb(reg++, REG);
  87         val = inb(VAL) << 8;
  88         outb(reg, REG);
  89         val |= inb(VAL);
  90         return val;
  91 }
  92
  93 static inline void
  94 superio_select(int ldn)
  95 {
  96         outb(DEV, REG);
  97         outb(ldn, VAL);
  98 }
  99
 100 static inline void
 101 superio_enter(void)
 102 {
 103         outb(0x87, REG);
 104         outb(0x01, REG);
 105         outb(0x55, REG);
 106         outb(0x55, REG);
 107 }
 108
 109 static inline void
 110 superio_exit(void)
 111 {
 112         outb(0x02, REG);
 113         outb(0x02, VAL);
 114 }
 115
 116 /* Logical device 4 registers */
 117 #define IT8712F_DEVID 0x8712
 118 #define IT8705F_DEVID 0x8705
 119 #define IT8716F_DEVID 0x8716
 120 #define IT8718F_DEVID 0x8718
 121 #define IT8720F_DEVID 0x8720
 122 #define IT8726F_DEVID 0x8726
 123 #define IT87_ACT_REG  0x30
 124 #define IT87_BASE_REG 0x60
 125
 126 /* Logical device 7 registers (IT8712F and later) */
 127 #define IT87_SIO_PINX2_REG      0x2c    /* Pin selection */
 128 #define IT87_SIO_VID_REG        0xfc    /* VID value */
 129
 130 /* Update battery voltage after every reading if true */
 131 static int update_vbat;
 132
 133 /* Not all BIOSes properly configure the PWM registers */
 134 static int fix_pwm_polarity;
 135
 136 /* Many IT87 constants specified below */
 137
 138 /* Length of ISA address segment */
 139 #define IT87_EXTENT 8
 140
 141 /* Length of ISA address segment for Environmental Controller */
 142 #define IT87_EC_EXTENT 2
 143
 144 /* Offset of EC registers from ISA base address */
 145 #define IT87_EC_OFFSET 5
 146
 147 /* Where are the ISA address/data registers relative to the EC base address */
 148 #define IT87_ADDR_REG_OFFSET 0
 149 #define IT87_DATA_REG_OFFSET 1
 150
 151 /*----- The IT87 registers -----*/
 152
 153 #define IT87_REG_CONFIG        0x00
 154
 155 #define IT87_REG_ALARM1        0x01
 156 #define IT87_REG_ALARM2        0x02
 157 #define IT87_REG_ALARM3        0x03
 158
 159 /* The IT8718F and IT8720F have the VID value in a different register, in
 160    Super-I/O configuration space. */
 161 #define IT87_REG_VID           0x0a
 162 /* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
 163    for fan divisors. Later IT8712F revisions must use 16-bit tachometer
 164    mode. */
 165 #define IT87_REG_FAN_DIV       0x0b
 166 #define IT87_REG_FAN_16BIT     0x0c
 167
 168 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
 169
 170 static const u8 IT87_REG_FAN[]          = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
 171 static const u8 IT87_REG_FAN_MIN[]      = { 0x10, 0x11, 0x12, 0x84, 0x86 };
 172 static const u8 IT87_REG_FANX[]         = { 0x18, 0x19, 0x1a, 0x81, 0x83 };
 173 static const u8 IT87_REG_FANX_MIN[]     = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
 174 #define IT87_REG_FAN_MAIN_CTRL 0x13
 175 #define IT87_REG_FAN_CTL       0x14
 176 #define IT87_REG_PWM(nr)       (0x15 + (nr))
 177
 178 #define IT87_REG_VIN(nr)       (0x20 + (nr))
 179 #define IT87_REG_TEMP(nr)      (0x29 + (nr))
 180
 181 #define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
 182 #define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
 183 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
 184 #define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)
 185
 186 #define IT87_REG_VIN_ENABLE    0x50
 187 #define IT87_REG_TEMP_ENABLE   0x51
 188
 189 #define IT87_REG_CHIPID        0x58
 190
 191 #define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
 192 #define IN_FROM_REG(val) ((val) * 16)
 193
 194 static inline u8 FAN_TO_REG(long rpm, int div)
 195 {
 196         if (rpm == 0)
 197                 return 255;
 198         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
 199         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
 200                              254);
 201 }
 202
 203 static inline u16 FAN16_TO_REG(long rpm)
 204 {
 205         if (rpm == 0)
 206                 return 0xffff;
 207         return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
 208 }
 209
 210 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
 211 /* The divider is fixed to 2 in 16-bit mode */
 212 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
 213
 214 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
 215                                         ((val)+500)/1000),-128,127))
 216 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
 217
 218 #define PWM_TO_REG(val)   ((val) >> 1)
 219 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
 220
 221 static int DIV_TO_REG(int val)
 222 {
 223         int answer = 0;
 224         while (answer < 7 && (val >>= 1))
 225                 answer++;
 226         return answer;
 227 }
 228 #define DIV_FROM_REG(val) (1 << (val))
 229
 230 static const unsigned int pwm_freq[8] = {
 231         48000000 / 128,
 232         24000000 / 128,
 233         12000000 / 128,
 234         8000000 / 128,
 235         6000000 / 128,
 236         3000000 / 128,
 237         1500000 / 128,
 238         750000 / 128,
 239 };
 240
 241
 242 struct it87_sio_data {
 243         enum chips type;
 244         /* Values read from Super-I/O config space */
 245         u8 revision;
 246         u8 vid_value;
 247         /* Values set based on DMI strings */
 248         u8 skip_pwm;
 249 };
 250
 251 /* For each registered chip, we need to keep some data in memory.
 252    The structure is dynamically allocated. */
 253 struct it87_data {
 254         struct device *hwmon_dev;
 255         enum chips type;
 256         u8 revision;
 257
 258         unsigned short addr;
 259         const char *name;
 260         struct mutex update_lock;
 261         char valid;             /* !=0 if following fields are valid */
 262         unsigned long last_updated;     /* In jiffies */
 263
 264         u8 in[9];               /* Register value */
 265         u8 in_max[8];           /* Register value */
 266         u8 in_min[8];           /* Register value */
 267         u8 has_fan;             /* Bitfield, fans enabled */
 268         u16 fan[5];             /* Register values, possibly combined */
 269         u16 fan_min[5];         /* Register values, possibly combined */
 270         u8 temp[3];             /* Register value */
 271         u8 temp_high[3];        /* Register value */
 272         u8 temp_low[3];         /* Register value */
 273         u8 sensor;              /* Register value */
 274         u8 fan_div[3];          /* Register encoding, shifted right */
 275         u8 vid;                 /* Register encoding, combined */
 276         u8 vrm;
 277         u32 alarms;             /* Register encoding, combined */
 278         u8 fan_main_ctrl;       /* Register value */
 279         u8 fan_ctl;             /* Register value */
 280         u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
 281 };
 282
 283 static inline int has_16bit_fans(const struct it87_data *data)
 284 {
 285         /* IT8705F Datasheet 0.4.1, 3h == Version G.
 286            IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
 287            These are the first revisions with 16bit tachometer support. */
 288         return (data->type == it87 && data->revision >= 0x03)
 289             || (data->type == it8712 && data->revision >= 0x08)
 290             || data->type == it8716
 291             || data->type == it8718
 292             || data->type == it8720;
 293 }
 294
 295 static int it87_probe(struct platform_device *pdev);
 296 static int __devexit it87_remove(struct platform_device *pdev);
 297
 298 static int it87_read_value(struct it87_data *data, u8 reg);
 299 static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
 300 static struct it87_data *it87_update_device(struct device *dev);
 301 static int it87_check_pwm(struct device *dev);
 302 static void it87_init_device(struct platform_device *pdev);
 303
 304
 305 static struct platform_driver it87_driver = {
 306         .driver = {
 307                 .owner  = THIS_MODULE,
 308                 .name   = DRVNAME,
 309         },
 310         .probe  = it87_probe,
 311         .remove = __devexit_p(it87_remove),
 312 };
 313
 314 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 315                 char *buf)
 316 {
 317         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 318         int nr = sensor_attr->index;
 319
 320         struct it87_data *data = it87_update_device(dev);
 321         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
 322 }
 323
 324 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 325                 char *buf)
 326 {
 327         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 328         int nr = sensor_attr->index;
 329
 330         struct it87_data *data = it87_update_device(dev);
 331         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
 332 }
 333
 334 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 335                 char *buf)
 336 {
 337         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 338         int nr = sensor_attr->index;
 339
 340         struct it87_data *data = it87_update_device(dev);
 341         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
 342 }
 343
 344 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 345                 const char *buf, size_t count)
 346 {
 347         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 348         int nr = sensor_attr->index;
 349
 350         struct it87_data *data = dev_get_drvdata(dev);
 351         unsigned long val = simple_strtoul(buf, NULL, 10);
 352
 353         mutex_lock(&data->update_lock);
 354         data->in_min[nr] = IN_TO_REG(val);
 355         it87_write_value(data, IT87_REG_VIN_MIN(nr),
 356                         data->in_min[nr]);
 357         mutex_unlock(&data->update_lock);
 358         return count;
 359 }
 360 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 361                 const char *buf, size_t count)
 362 {
 363         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 364         int nr = sensor_attr->index;
 365
 366         struct it87_data *data = dev_get_drvdata(dev);
 367         unsigned long val = simple_strtoul(buf, NULL, 10);
 368
 369         mutex_lock(&data->update_lock);
 370         data->in_max[nr] = IN_TO_REG(val);
 371         it87_write_value(data, IT87_REG_VIN_MAX(nr),
 372                         data->in_max[nr]);
 373         mutex_unlock(&data->update_lock);
 374         return count;
 375 }
 376
 377 #define show_in_offset(offset)                                  \
 378 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 379                 show_in, NULL, offset);
 380
 381 #define limit_in_offset(offset)                                 \
 382 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 383                 show_in_min, set_in_min, offset);               \
 384 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 385                 show_in_max, set_in_max, offset);
 386
 387 show_in_offset(0);
 388 limit_in_offset(0);
 389 show_in_offset(1);
 390 limit_in_offset(1);
 391 show_in_offset(2);
 392 limit_in_offset(2);
 393 show_in_offset(3);
 394 limit_in_offset(3);
 395 show_in_offset(4);
 396 limit_in_offset(4);
 397 show_in_offset(5);
 398 limit_in_offset(5);
 399 show_in_offset(6);
 400 limit_in_offset(6);
 401 show_in_offset(7);
 402 limit_in_offset(7);
 403 show_in_offset(8);
 404
 405 /* 3 temperatures */
 406 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 407                 char *buf)
 408 {
 409         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 410         int nr = sensor_attr->index;
 411
 412         struct it87_data *data = it87_update_device(dev);
 413         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 414 }
 415 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 416                 char *buf)
 417 {
 418         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 419         int nr = sensor_attr->index;
 420
 421         struct it87_data *data = it87_update_device(dev);
 422         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
 423 }
 424 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 425                 char *buf)
 426 {
 427         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 428         int nr = sensor_attr->index;
 429
 430         struct it87_data *data = it87_update_device(dev);
 431         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
 432 }
 433 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 434                 const char *buf, size_t count)
 435 {
 436         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 437         int nr = sensor_attr->index;
 438
 439         struct it87_data *data = dev_get_drvdata(dev);
 440         int val = simple_strtol(buf, NULL, 10);
 441
 442         mutex_lock(&data->update_lock);
 443         data->temp_high[nr] = TEMP_TO_REG(val);
 444         it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
 445         mutex_unlock(&data->update_lock);
 446         return count;
 447 }
 448 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 449                 const char *buf, size_t count)
 450 {
 451         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 452         int nr = sensor_attr->index;
 453
 454         struct it87_data *data = dev_get_drvdata(dev);
 455         int val = simple_strtol(buf, NULL, 10);
 456
 457         mutex_lock(&data->update_lock);
 458         data->temp_low[nr] = TEMP_TO_REG(val);
 459         it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
 460         mutex_unlock(&data->update_lock);
 461         return count;
 462 }
 463 #define show_temp_offset(offset)                                        \
 464 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
 465                 show_temp, NULL, offset - 1);                           \
 466 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 467                 show_temp_max, set_temp_max, offset - 1);               \
 468 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
 469                 show_temp_min, set_temp_min, offset - 1);
 470
 471 show_temp_offset(1);
 472 show_temp_offset(2);
 473 show_temp_offset(3);
 474
 475 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
 476                 char *buf)
 477 {
 478         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 479         int nr = sensor_attr->index;
 480
 481         struct it87_data *data = it87_update_device(dev);
 482         u8 reg = data->sensor; /* In case the value is updated while we use it */
 483
 484         if (reg & (1 << nr))
 485                 return sprintf(buf, "3\n");  /* thermal diode */
 486         if (reg & (8 << nr))
 487                 return sprintf(buf, "4\n");  /* thermistor */
 488         return sprintf(buf, "0\n");      /* disabled */
 489 }
 490 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
 491                 const char *buf, size_t count)
 492 {
 493         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 494         int nr = sensor_attr->index;
 495
 496         struct it87_data *data = dev_get_drvdata(dev);
 497         int val = simple_strtol(buf, NULL, 10);
 498
 499         mutex_lock(&data->update_lock);
 500
 501         data->sensor &= ~(1 << nr);
 502         data->sensor &= ~(8 << nr);
 503         if (val == 2) { /* backwards compatibility */
 504                 dev_warn(dev, "Sensor type 2 is deprecated, please use 4 "
 505                          "instead\n");
 506                 val = 4;
 507         }
 508         /* 3 = thermal diode; 4 = thermistor; 0 = disabled */
 509         if (val == 3)
 510             data->sensor |= 1 << nr;
 511         else if (val == 4)
 512             data->sensor |= 8 << nr;
 513         else if (val != 0) {
 514                 mutex_unlock(&data->update_lock);
 515                 return -EINVAL;
 516         }
 517         it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
 518         mutex_unlock(&data->update_lock);
 519         return count;
 520 }
 521 #define show_sensor_offset(offset)                                      \
 522 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,       \
 523                 show_sensor, set_sensor, offset - 1);
 524
 525 show_sensor_offset(1);
 526 show_sensor_offset(2);
 527 show_sensor_offset(3);
 528
 529 /* 3 Fans */
 530 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 531                 char *buf)
 532 {
 533         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 534         int nr = sensor_attr->index;
 535
 536         struct it87_data *data = it87_update_device(dev);
 537         return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
 538                                 DIV_FROM_REG(data->fan_div[nr])));
 539 }
 540 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 541                 char *buf)
 542 {
 543         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 544         int nr = sensor_attr->index;
 545
 546         struct it87_data *data = it87_update_device(dev);
 547         return sprintf(buf,"%d\n",
 548                 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
 549 }
 550 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 551                 char *buf)
 552 {
 553         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 554         int nr = sensor_attr->index;
 555
 556         struct it87_data *data = it87_update_device(dev);
 557         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 558 }
 559 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
 560                 char *buf)
 561 {
 562         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 563         int nr = sensor_attr->index;
 564
 565         struct it87_data *data = it87_update_device(dev);
 566         return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
 567 }
 568 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
 569                 char *buf)
 570 {
 571         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 572         int nr = sensor_attr->index;
 573
 574         struct it87_data *data = it87_update_device(dev);
 575         return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
 576 }
 577 static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
 578                 char *buf)
 579 {
 580         struct it87_data *data = it87_update_device(dev);
 581         int index = (data->fan_ctl >> 4) & 0x07;
 582
 583         return sprintf(buf, "%u\n", pwm_freq[index]);
 584 }
 585 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 586                 const char *buf, size_t count)
 587 {
 588         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 589         int nr = sensor_attr->index;
 590
 591         struct it87_data *data = dev_get_drvdata(dev);
 592         int val = simple_strtol(buf, NULL, 10);
 593         u8 reg;
 594
 595         mutex_lock(&data->update_lock);
 596         reg = it87_read_value(data, IT87_REG_FAN_DIV);
 597         switch (nr) {
 598         case 0: data->fan_div[nr] = reg & 0x07; break;
 599         case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
 600         case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
 601         }
 602
 603         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 604         it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
 605         mutex_unlock(&data->update_lock);
 606         return count;
 607 }
 608 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 609                 const char *buf, size_t count)
 610 {
 611         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 612         int nr = sensor_attr->index;
 613
 614         struct it87_data *data = dev_get_drvdata(dev);
 615         unsigned long val = simple_strtoul(buf, NULL, 10);
 616         int min;
 617         u8 old;
 618
 619         mutex_lock(&data->update_lock);
 620         old = it87_read_value(data, IT87_REG_FAN_DIV);
 621
 622         /* Save fan min limit */
 623         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 624
 625         switch (nr) {
 626         case 0:
 627         case 1:
 628                 data->fan_div[nr] = DIV_TO_REG(val);
 629                 break;
 630         case 2:
 631                 if (val < 8)
 632                         data->fan_div[nr] = 1;
 633                 else
 634                         data->fan_div[nr] = 3;
 635         }
 636         val = old & 0x80;
 637         val |= (data->fan_div[0] & 0x07);
 638         val |= (data->fan_div[1] & 0x07) << 3;
 639         if (data->fan_div[2] == 3)
 640                 val |= 0x1 << 6;
 641         it87_write_value(data, IT87_REG_FAN_DIV, val);
 642
 643         /* Restore fan min limit */
 644         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 645         it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
 646
 647         mutex_unlock(&data->update_lock);
 648         return count;
 649 }
 650 static ssize_t set_pwm_enable(struct device *dev,
 651                 struct device_attribute *attr, const char *buf, size_t count)
 652 {
 653         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 654         int nr = sensor_attr->index;
 655
 656         struct it87_data *data = dev_get_drvdata(dev);
 657         int val = simple_strtol(buf, NULL, 10);
 658
 659         mutex_lock(&data->update_lock);
 660
 661         if (val == 0) {
 662                 int tmp;
 663                 /* make sure the fan is on when in on/off mode */
 664                 tmp = it87_read_value(data, IT87_REG_FAN_CTL);
 665                 it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));
 666                 /* set on/off mode */
 667                 data->fan_main_ctrl &= ~(1 << nr);
 668                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
 669         } else if (val == 1) {
 670                 /* set SmartGuardian mode */
 671                 data->fan_main_ctrl |= (1 << nr);
 672                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
 673                 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
 674                 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
 675         } else {
 676                 mutex_unlock(&data->update_lock);
 677                 return -EINVAL;
 678         }
 679
 680         mutex_unlock(&data->update_lock);
 681         return count;
 682 }
 683 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
 684                 const char *buf, size_t count)
 685 {
 686         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 687         int nr = sensor_attr->index;
 688
 689         struct it87_data *data = dev_get_drvdata(dev);
 690         int val = simple_strtol(buf, NULL, 10);
 691
 692         if (val < 0 || val > 255)
 693                 return -EINVAL;
 694
 695         mutex_lock(&data->update_lock);
 696         data->manual_pwm_ctl[nr] = val;
 697         if (data->fan_main_ctrl & (1 << nr))
 698                 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
 699         mutex_unlock(&data->update_lock);
 700         return count;
 701 }
 702 static ssize_t set_pwm_freq(struct device *dev,
 703                 struct device_attribute *attr, const char *buf, size_t count)
 704 {
 705         struct it87_data *data = dev_get_drvdata(dev);
 706         unsigned long val = simple_strtoul(buf, NULL, 10);
 707         int i;
 708
 709         /* Search for the nearest available frequency */
 710         for (i = 0; i < 7; i++) {
 711                 if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
 712                         break;
 713         }
 714
 715         mutex_lock(&data->update_lock);
 716         data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
 717         data->fan_ctl |= i << 4;
 718         it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
 719         mutex_unlock(&data->update_lock);
 720
 721         return count;
 722 }
 723
 724 #define show_fan_offset(offset)                                 \
 725 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
 726                 show_fan, NULL, offset - 1);                    \
 727 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 728                 show_fan_min, set_fan_min, offset - 1);         \
 729 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 730                 show_fan_div, set_fan_div, offset - 1);
 731
 732 show_fan_offset(1);
 733 show_fan_offset(2);
 734 show_fan_offset(3);
 735
 736 #define show_pwm_offset(offset)                                         \
 737 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,      \
 738                 show_pwm_enable, set_pwm_enable, offset - 1);           \
 739 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,               \
 740                 show_pwm, set_pwm, offset - 1);                         \
 741 static DEVICE_ATTR(pwm##offset##_freq,                                  \
 742                 (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),            \
 743                 show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
 744
 745 show_pwm_offset(1);
 746 show_pwm_offset(2);
 747 show_pwm_offset(3);
 748
 749 /* A different set of callbacks for 16-bit fans */
 750 static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
 751                 char *buf)
 752 {
 753         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 754         int nr = sensor_attr->index;
 755         struct it87_data *data = it87_update_device(dev);
 756         return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
 757 }
 758
 759 static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
 760                 char *buf)
 761 {
 762         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 763         int nr = sensor_attr->index;
 764         struct it87_data *data = it87_update_device(dev);
 765         return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
 766 }
 767
 768 static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
 769                 const char *buf, size_t count)
 770 {
 771         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 772         int nr = sensor_attr->index;
 773         struct it87_data *data = dev_get_drvdata(dev);
 774         int val = simple_strtol(buf, NULL, 10);
 775
 776         mutex_lock(&data->update_lock);
 777         data->fan_min[nr] = FAN16_TO_REG(val);
 778         it87_write_value(data, IT87_REG_FAN_MIN[nr],
 779                          data->fan_min[nr] & 0xff);
 780         it87_write_value(data, IT87_REG_FANX_MIN[nr],
 781                          data->fan_min[nr] >> 8);
 782         mutex_unlock(&data->update_lock);
 783         return count;
 784 }
 785
 786 /* We want to use the same sysfs file names as 8-bit fans, but we need
 787    different variable names, so we have to use SENSOR_ATTR instead of
 788    SENSOR_DEVICE_ATTR. */
 789 #define show_fan16_offset(offset) \
 790 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
 791         = SENSOR_ATTR(fan##offset##_input, S_IRUGO,             \
 792                 show_fan16, NULL, offset - 1);                  \
 793 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
 794         = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,     \
 795                 show_fan16_min, set_fan16_min, offset - 1)
 796
 797 show_fan16_offset(1);
 798 show_fan16_offset(2);
 799 show_fan16_offset(3);
 800 show_fan16_offset(4);
 801 show_fan16_offset(5);
 802
 803 /* Alarms */
 804 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 805 {
 806         struct it87_data *data = it87_update_device(dev);
 807         return sprintf(buf, "%u\n", data->alarms);
 808 }
 809 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 810
 811 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 812                 char *buf)
 813 {
 814         int bitnr = to_sensor_dev_attr(attr)->index;
 815         struct it87_data *data = it87_update_device(dev);
 816         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 817 }
 818 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
 819 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
 820 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
 821 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
 822 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
 823 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
 824 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
 825 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
 826 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
 827 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
 828 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
 829 static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
 830 static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
 831 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
 832 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
 833 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
 834
 835 static ssize_t
 836 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
 837 {
 838         struct it87_data *data = dev_get_drvdata(dev);
 839         return sprintf(buf, "%u\n", data->vrm);
 840 }
 841 static ssize_t
 842 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 843 {
 844         struct it87_data *data = dev_get_drvdata(dev);
 845         u32 val;
 846
 847         val = simple_strtoul(buf, NULL, 10);
 848         data->vrm = val;
 849
 850         return count;
 851 }
 852 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
 853
 854 static ssize_t
 855 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
 856 {
 857         struct it87_data *data = it87_update_device(dev);
 858         return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
 859 }
 860 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
 861
 862 static ssize_t show_name(struct device *dev, struct device_attribute
 863                          *devattr, char *buf)
 864 {
 865         struct it87_data *data = dev_get_drvdata(dev);
 866         return sprintf(buf, "%s\n", data->name);
 867 }
 868 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 869
 870 static struct attribute *it87_attributes[] = {
 871         &sensor_dev_attr_in0_input.dev_attr.attr,
 872         &sensor_dev_attr_in1_input.dev_attr.attr,
 873         &sensor_dev_attr_in2_input.dev_attr.attr,
 874         &sensor_dev_attr_in3_input.dev_attr.attr,
 875         &sensor_dev_attr_in4_input.dev_attr.attr,
 876         &sensor_dev_attr_in5_input.dev_attr.attr,
 877         &sensor_dev_attr_in6_input.dev_attr.attr,
 878         &sensor_dev_attr_in7_input.dev_attr.attr,
 879         &sensor_dev_attr_in8_input.dev_attr.attr,
 880         &sensor_dev_attr_in0_min.dev_attr.attr,
 881         &sensor_dev_attr_in1_min.dev_attr.attr,
 882         &sensor_dev_attr_in2_min.dev_attr.attr,
 883         &sensor_dev_attr_in3_min.dev_attr.attr,
 884         &sensor_dev_attr_in4_min.dev_attr.attr,
 885         &sensor_dev_attr_in5_min.dev_attr.attr,
 886         &sensor_dev_attr_in6_min.dev_attr.attr,
 887         &sensor_dev_attr_in7_min.dev_attr.attr,
 888         &sensor_dev_attr_in0_max.dev_attr.attr,
 889         &sensor_dev_attr_in1_max.dev_attr.attr,
 890         &sensor_dev_attr_in2_max.dev_attr.attr,
 891         &sensor_dev_attr_in3_max.dev_attr.attr,
 892         &sensor_dev_attr_in4_max.dev_attr.attr,
 893         &sensor_dev_attr_in5_max.dev_attr.attr,
 894         &sensor_dev_attr_in6_max.dev_attr.attr,
 895         &sensor_dev_attr_in7_max.dev_attr.attr,
 896         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 897         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 898         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 899         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 900         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 901         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 902         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 903         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 904
 905         &sensor_dev_attr_temp1_input.dev_attr.attr,
 906         &sensor_dev_attr_temp2_input.dev_attr.attr,
 907         &sensor_dev_attr_temp3_input.dev_attr.attr,
 908         &sensor_dev_attr_temp1_max.dev_attr.attr,
 909         &sensor_dev_attr_temp2_max.dev_attr.attr,
 910         &sensor_dev_attr_temp3_max.dev_attr.attr,
 911         &sensor_dev_attr_temp1_min.dev_attr.attr,
 912         &sensor_dev_attr_temp2_min.dev_attr.attr,
 913         &sensor_dev_attr_temp3_min.dev_attr.attr,
 914         &sensor_dev_attr_temp1_type.dev_attr.attr,
 915         &sensor_dev_attr_temp2_type.dev_attr.attr,
 916         &sensor_dev_attr_temp3_type.dev_attr.attr,
 917         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 918         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 919         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 920
 921         &dev_attr_alarms.attr,
 922         &dev_attr_name.attr,
 923         NULL
 924 };
 925
 926 static const struct attribute_group it87_group = {
 927         .attrs = it87_attributes,
 928 };
 929
 930 static struct attribute *it87_attributes_opt[] = {
 931         &sensor_dev_attr_fan1_input16.dev_attr.attr,
 932         &sensor_dev_attr_fan1_min16.dev_attr.attr,
 933         &sensor_dev_attr_fan2_input16.dev_attr.attr,
 934         &sensor_dev_attr_fan2_min16.dev_attr.attr,
 935         &sensor_dev_attr_fan3_input16.dev_attr.attr,
 936         &sensor_dev_attr_fan3_min16.dev_attr.attr,
 937         &sensor_dev_attr_fan4_input16.dev_attr.attr,
 938         &sensor_dev_attr_fan4_min16.dev_attr.attr,
 939         &sensor_dev_attr_fan5_input16.dev_attr.attr,
 940         &sensor_dev_attr_fan5_min16.dev_attr.attr,
 941
 942         &sensor_dev_attr_fan1_input.dev_attr.attr,
 943         &sensor_dev_attr_fan1_min.dev_attr.attr,
 944         &sensor_dev_attr_fan1_div.dev_attr.attr,
 945         &sensor_dev_attr_fan2_input.dev_attr.attr,
 946         &sensor_dev_attr_fan2_min.dev_attr.attr,
 947         &sensor_dev_attr_fan2_div.dev_attr.attr,
 948         &sensor_dev_attr_fan3_input.dev_attr.attr,
 949         &sensor_dev_attr_fan3_min.dev_attr.attr,
 950         &sensor_dev_attr_fan3_div.dev_attr.attr,
 951
 952         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 953         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 954         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 955         &sensor_dev_attr_fan4_alarm.dev_attr.attr,
 956         &sensor_dev_attr_fan5_alarm.dev_attr.attr,
 957
 958         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 959         &sensor_dev_attr_pwm2_enable.dev_attr.attr,
 960         &sensor_dev_attr_pwm3_enable.dev_attr.attr,
 961         &sensor_dev_attr_pwm1.dev_attr.attr,
 962         &sensor_dev_attr_pwm2.dev_attr.attr,
 963         &sensor_dev_attr_pwm3.dev_attr.attr,
 964         &dev_attr_pwm1_freq.attr,
 965         &dev_attr_pwm2_freq.attr,
 966         &dev_attr_pwm3_freq.attr,
 967
 968         &dev_attr_vrm.attr,
 969         &dev_attr_cpu0_vid.attr,
 970         NULL
 971 };
 972
 973 static const struct attribute_group it87_group_opt = {
 974         .attrs = it87_attributes_opt,
 975 };
 976
 977 /* SuperIO detection - will change isa_address if a chip is found */
 978 static int __init it87_find(unsigned short *address,
 979         struct it87_sio_data *sio_data)
 980 {
 981         int err = -ENODEV;
 982         u16 chip_type;
 983         const char *board_vendor, *board_name;
 984
 985         superio_enter();
 986         chip_type = force_id ? force_id : superio_inw(DEVID);
 987
 988         switch (chip_type) {
 989         case IT8705F_DEVID:
 990                 sio_data->type = it87;
 991                 break;
 992         case IT8712F_DEVID:
 993                 sio_data->type = it8712;
 994                 break;
 995         case IT8716F_DEVID:
 996         case IT8726F_DEVID:
 997                 sio_data->type = it8716;
 998                 break;
 999         case IT8718F_DEVID:
1000                 sio_data->type = it8718;
1001                 break;
1002         case IT8720F_DEVID:
1003                 sio_data->type = it8720;
1004                 break;
1005         case 0xffff:    /* No device at all */
1006                 goto exit;
1007         default:
1008                 pr_debug(DRVNAME ": Unsupported chip (DEVID=0x%x)\n",
1009                          chip_type);
1010                 goto exit;
1011         }
1012
1013         superio_select(PME);
1014         if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
1015                 pr_info("it87: Device not activated, skipping\n");
1016                 goto exit;
1017         }
1018
1019         *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
1020         if (*address == 0) {
1021                 pr_info("it87: Base address not set, skipping\n");
1022                 goto exit;
1023         }
1024
1025         err = 0;
1026         sio_data->revision = superio_inb(DEVREV) & 0x0f;
1027         pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
1028                 chip_type, *address, sio_data->revision);
1029
1030         /* Read GPIO config and VID value from LDN 7 (GPIO) */
1031         if (chip_type != IT8705F_DEVID) {
1032                 int reg;
1033
1034                 superio_select(GPIO);
1035                 if ((chip_type == it8718) ||
1036                     (chip_type == it8720))
1037                         sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
1038
1039                 reg = superio_inb(IT87_SIO_PINX2_REG);
1040                 if (reg & (1 << 0))
1041                         pr_info("it87: in3 is VCC (+5V)\n");
1042                 if (reg & (1 << 1))
1043                         pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
1044         }
1045
1046         /* Disable specific features based on DMI strings */
1047         board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
1048         board_name = dmi_get_system_info(DMI_BOARD_NAME);
1049         if (board_vendor && board_name) {
1050                 if (strcmp(board_vendor, "nVIDIA") == 0
1051                  && strcmp(board_name, "FN68PT") == 0) {
1052                         /* On the Shuttle SN68PT, FAN_CTL2 is apparently not
1053                            connected to a fan, but to something else. One user
1054                            has reported instant system power-off when changing
1055                            the PWM2 duty cycle, so we disable it.
1056                            I use the board name string as the trigger in case
1057                            the same board is ever used in other systems. */
1058                         pr_info("it87: Disabling pwm2 due to "
1059                                 "hardware constraints\n");
1060                         sio_data->skip_pwm = (1 << 1);
1061                 }
1062         }
1063
1064 exit:
1065         superio_exit();
1066         return err;
1067 }
1068
1069 static int __devinit it87_probe(struct platform_device *pdev)
1070 {
1071         struct it87_data *data;
1072         struct resource *res;
1073         struct device *dev = &pdev->dev;
1074         struct it87_sio_data *sio_data = dev->platform_data;
1075         int err = 0;
1076         int enable_pwm_interface;
1077         static const char *names[] = {
1078                 "it87",
1079                 "it8712",
1080                 "it8716",
1081                 "it8718",
1082                 "it8720",
1083         };
1084
1085         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1086         if (!request_region(res->start, IT87_EC_EXTENT, DRVNAME)) {
1087                 dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
1088                         (unsigned long)res->start,
1089                         (unsigned long)(res->start + IT87_EC_EXTENT - 1));
1090                 err = -EBUSY;
1091                 goto ERROR0;
1092         }
1093
1094         if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
1095                 err = -ENOMEM;
1096                 goto ERROR1;
1097         }
1098
1099         data->addr = res->start;
1100         data->type = sio_data->type;
1101         data->revision = sio_data->revision;
1102         data->name = names[sio_data->type];
1103
1104         /* Now, we do the remaining detection. */
1105         if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
1106          || it87_read_value(data, IT87_REG_CHIPID) != 0x90) {
1107                 err = -ENODEV;
1108                 goto ERROR2;
1109         }
1110
1111         platform_set_drvdata(pdev, data);
1112
1113         mutex_init(&data->update_lock);
1114
1115         /* Check PWM configuration */
1116         enable_pwm_interface = it87_check_pwm(dev);
1117
1118         /* Initialize the IT87 chip */
1119         it87_init_device(pdev);
1120
1121         /* Register sysfs hooks */
1122         if ((err = sysfs_create_group(&dev->kobj, &it87_group)))
1123                 goto ERROR2;
1124
1125         /* Do not create fan files for disabled fans */
1126         if (has_16bit_fans(data)) {
1127                 /* 16-bit tachometers */
1128                 if (data->has_fan & (1 << 0)) {
1129                         if ((err = device_create_file(dev,
1130                              &sensor_dev_attr_fan1_input16.dev_attr))
1131                          || (err = device_create_file(dev,
1132                              &sensor_dev_attr_fan1_min16.dev_attr))
1133                          || (err = device_create_file(dev,
1134                              &sensor_dev_attr_fan1_alarm.dev_attr)))
1135                                 goto ERROR4;
1136                 }
1137                 if (data->has_fan & (1 << 1)) {
1138                         if ((err = device_create_file(dev,
1139                              &sensor_dev_attr_fan2_input16.dev_attr))
1140                          || (err = device_create_file(dev,
1141                              &sensor_dev_attr_fan2_min16.dev_attr))
1142                          || (err = device_create_file(dev,
1143                              &sensor_dev_attr_fan2_alarm.dev_attr)))
1144                                 goto ERROR4;
1145                 }
1146                 if (data->has_fan & (1 << 2)) {
1147                         if ((err = device_create_file(dev,
1148                              &sensor_dev_attr_fan3_input16.dev_attr))
1149                          || (err = device_create_file(dev,
1150                              &sensor_dev_attr_fan3_min16.dev_attr))
1151                          || (err = device_create_file(dev,
1152                              &sensor_dev_attr_fan3_alarm.dev_attr)))
1153                                 goto ERROR4;
1154                 }
1155                 if (data->has_fan & (1 << 3)) {
1156                         if ((err = device_create_file(dev,
1157                              &sensor_dev_attr_fan4_input16.dev_attr))
1158                          || (err = device_create_file(dev,
1159                              &sensor_dev_attr_fan4_min16.dev_attr))
1160                          || (err = device_create_file(dev,
1161                              &sensor_dev_attr_fan4_alarm.dev_attr)))
1162                                 goto ERROR4;
1163                 }
1164                 if (data->has_fan & (1 << 4)) {
1165                         if ((err = device_create_file(dev,
1166                              &sensor_dev_attr_fan5_input16.dev_attr))
1167                          || (err = device_create_file(dev,
1168                              &sensor_dev_attr_fan5_min16.dev_attr))
1169                          || (err = device_create_file(dev,
1170                              &sensor_dev_attr_fan5_alarm.dev_attr)))
1171                                 goto ERROR4;
1172                 }
1173         } else {
1174                 /* 8-bit tachometers with clock divider */
1175                 if (data->has_fan & (1 << 0)) {
1176                         if ((err = device_create_file(dev,
1177                              &sensor_dev_attr_fan1_input.dev_attr))
1178                          || (err = device_create_file(dev,
1179                              &sensor_dev_attr_fan1_min.dev_attr))
1180                          || (err = device_create_file(dev,
1181                              &sensor_dev_attr_fan1_div.dev_attr))
1182                          || (err = device_create_file(dev,
1183                              &sensor_dev_attr_fan1_alarm.dev_attr)))
1184                                 goto ERROR4;
1185                 }
1186                 if (data->has_fan & (1 << 1)) {
1187                         if ((err = device_create_file(dev,
1188                              &sensor_dev_attr_fan2_input.dev_attr))
1189                          || (err = device_create_file(dev,
1190                              &sensor_dev_attr_fan2_min.dev_attr))
1191                          || (err = device_create_file(dev,
1192                              &sensor_dev_attr_fan2_div.dev_attr))
1193                          || (err = device_create_file(dev,
1194                              &sensor_dev_attr_fan2_alarm.dev_attr)))
1195                                 goto ERROR4;
1196                 }
1197                 if (data->has_fan & (1 << 2)) {
1198                         if ((err = device_create_file(dev,
1199                              &sensor_dev_attr_fan3_input.dev_attr))
1200                          || (err = device_create_file(dev,
1201                              &sensor_dev_attr_fan3_min.dev_attr))
1202                          || (err = device_create_file(dev,
1203                              &sensor_dev_attr_fan3_div.dev_attr))
1204                          || (err = device_create_file(dev,
1205                              &sensor_dev_attr_fan3_alarm.dev_attr)))
1206                                 goto ERROR4;
1207                 }
1208         }
1209
1210         if (enable_pwm_interface) {
1211                 if (!(sio_data->skip_pwm & (1 << 0))) {
1212                         if ((err = device_create_file(dev,
1213                              &sensor_dev_attr_pwm1_enable.dev_attr))
1214                          || (err = device_create_file(dev,
1215                              &sensor_dev_attr_pwm1.dev_attr))
1216                          || (err = device_create_file(dev,
1217                              &dev_attr_pwm1_freq)))
1218                                 goto ERROR4;
1219                 }
1220                 if (!(sio_data->skip_pwm & (1 << 1))) {
1221                         if ((err = device_create_file(dev,
1222                              &sensor_dev_attr_pwm2_enable.dev_attr))
1223                          || (err = device_create_file(dev,
1224                              &sensor_dev_attr_pwm2.dev_attr))
1225                          || (err = device_create_file(dev,
1226                              &dev_attr_pwm2_freq)))
1227                                 goto ERROR4;
1228                 }
1229                 if (!(sio_data->skip_pwm & (1 << 2))) {
1230                         if ((err = device_create_file(dev,
1231                              &sensor_dev_attr_pwm3_enable.dev_attr))
1232                          || (err = device_create_file(dev,
1233                              &sensor_dev_attr_pwm3.dev_attr))
1234                          || (err = device_create_file(dev,
1235                              &dev_attr_pwm3_freq)))
1236                                 goto ERROR4;
1237                 }
1238         }
1239
1240         if (data->type == it8712 || data->type == it8716
1241          || data->type == it8718 || data->type == it8720) {
1242                 data->vrm = vid_which_vrm();
1243                 /* VID reading from Super-I/O config space if available */
1244                 data->vid = sio_data->vid_value;
1245                 if ((err = device_create_file(dev,
1246                      &dev_attr_vrm))
1247                  || (err = device_create_file(dev,
1248                      &dev_attr_cpu0_vid)))
1249                         goto ERROR4;
1250         }
1251
1252         data->hwmon_dev = hwmon_device_register(dev);
1253         if (IS_ERR(data->hwmon_dev)) {
1254                 err = PTR_ERR(data->hwmon_dev);
1255                 goto ERROR4;
1256         }
1257
1258         return 0;
1259
1260 ERROR4:
1261         sysfs_remove_group(&dev->kobj, &it87_group);
1262         sysfs_remove_group(&dev->kobj, &it87_group_opt);
1263 ERROR2:
1264         platform_set_drvdata(pdev, NULL);
1265         kfree(data);
1266 ERROR1:
1267         release_region(res->start, IT87_EC_EXTENT);
1268 ERROR0:
1269         return err;
1270 }
1271
1272 static int __devexit it87_remove(struct platform_device *pdev)
1273 {
1274         struct it87_data *data = platform_get_drvdata(pdev);
1275
1276         hwmon_device_unregister(data->hwmon_dev);
1277         sysfs_remove_group(&pdev->dev.kobj, &it87_group);
1278         sysfs_remove_group(&pdev->dev.kobj, &it87_group_opt);
1279
1280         release_region(data->addr, IT87_EC_EXTENT);
1281         platform_set_drvdata(pdev, NULL);
1282         kfree(data);
1283
1284         return 0;
1285 }
1286
1287 /* Must be called with data->update_lock held, except during initialization.
1288    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1289    would slow down the IT87 access and should not be necessary. */
1290 static int it87_read_value(struct it87_data *data, u8 reg)
1291 {
1292         outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1293         return inb_p(data->addr + IT87_DATA_REG_OFFSET);
1294 }
1295
1296 /* Must be called with data->update_lock held, except during initialization.
1297    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1298    would slow down the IT87 access and should not be necessary. */
1299 static void it87_write_value(struct it87_data *data, u8 reg, u8 value)
1300 {
1301         outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1302         outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
1303 }
1304
1305 /* Return 1 if and only if the PWM interface is safe to use */
1306 static int __devinit it87_check_pwm(struct device *dev)
1307 {
1308         struct it87_data *data = dev_get_drvdata(dev);
1309         /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1310          * and polarity set to active low is sign that this is the case so we
1311          * disable pwm control to protect the user. */
1312         int tmp = it87_read_value(data, IT87_REG_FAN_CTL);
1313         if ((tmp & 0x87) == 0) {
1314                 if (fix_pwm_polarity) {
1315                         /* The user asks us to attempt a chip reconfiguration.
1316                          * This means switching to active high polarity and
1317                          * inverting all fan speed values. */
1318                         int i;
1319                         u8 pwm[3];
1320
1321                         for (i = 0; i < 3; i++)
1322                                 pwm[i] = it87_read_value(data,
1323                                                          IT87_REG_PWM(i));
1324
1325                         /* If any fan is in automatic pwm mode, the polarity
1326                          * might be correct, as suspicious as it seems, so we
1327                          * better don't change anything (but still disable the
1328                          * PWM interface). */
1329                         if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1330                                 dev_info(dev, "Reconfiguring PWM to "
1331                                          "active high polarity\n");
1332                                 it87_write_value(data, IT87_REG_FAN_CTL,
1333                                                  tmp | 0x87);
1334                                 for (i = 0; i < 3; i++)
1335                                         it87_write_value(data,
1336                                                          IT87_REG_PWM(i),
1337                                                          0x7f & ~pwm[i]);
1338                                 return 1;
1339                         }
1340
1341                         dev_info(dev, "PWM configuration is "
1342                                  "too broken to be fixed\n");
1343                 }
1344
1345                 dev_info(dev, "Detected broken BIOS "
1346                          "defaults, disabling PWM interface\n");
1347                 return 0;
1348         } else if (fix_pwm_polarity) {
1349                 dev_info(dev, "PWM configuration looks "
1350                          "sane, won't touch\n");
1351         }
1352
1353         return 1;
1354 }
1355
1356 /* Called when we have found a new IT87. */
1357 static void __devinit it87_init_device(struct platform_device *pdev)
1358 {
1359         struct it87_data *data = platform_get_drvdata(pdev);
1360         int tmp, i;
1361
1362         /* initialize to sane defaults:
1363          * - if the chip is in manual pwm mode, this will be overwritten with
1364          *   the actual settings on the chip (so in this case, initialization
1365          *   is not needed)
1366          * - if in automatic or on/off mode, we could switch to manual mode,
1367          *   read the registers and set manual_pwm_ctl accordingly, but currently
1368          *   this is not implemented, so we initialize to something sane */
1369         for (i = 0; i < 3; i++) {
1370                 data->manual_pwm_ctl[i] = 0xff;
1371         }
1372
1373         /* Some chips seem to have default value 0xff for all limit
1374          * registers. For low voltage limits it makes no sense and triggers
1375          * alarms, so change to 0 instead. For high temperature limits, it
1376          * means -1 degree C, which surprisingly doesn't trigger an alarm,
1377          * but is still confusing, so change to 127 degrees C. */
1378         for (i = 0; i < 8; i++) {
1379                 tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
1380                 if (tmp == 0xff)
1381                         it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
1382         }
1383         for (i = 0; i < 3; i++) {
1384                 tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1385                 if (tmp == 0xff)
1386                         it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
1387         }
1388
1389         /* Check if temperature channels are reset manually or by some reason */
1390         tmp = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1391         if ((tmp & 0x3f) == 0) {
1392                 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1393                 tmp = (tmp & 0xc0) | 0x2a;
1394                 it87_write_value(data, IT87_REG_TEMP_ENABLE, tmp);
1395         }
1396         data->sensor = tmp;
1397
1398         /* Check if voltage monitors are reset manually or by some reason */
1399         tmp = it87_read_value(data, IT87_REG_VIN_ENABLE);
1400         if ((tmp & 0xff) == 0) {
1401                 /* Enable all voltage monitors */
1402                 it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff);
1403         }
1404
1405         /* Check if tachometers are reset manually or by some reason */
1406         data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
1407         if ((data->fan_main_ctrl & 0x70) == 0) {
1408                 /* Enable all fan tachometers */
1409                 data->fan_main_ctrl |= 0x70;
1410                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1411         }
1412         data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1413
1414         /* Set tachometers to 16-bit mode if needed */
1415         if (has_16bit_fans(data)) {
1416                 tmp = it87_read_value(data, IT87_REG_FAN_16BIT);
1417                 if (~tmp & 0x07 & data->has_fan) {
1418                         dev_dbg(&pdev->dev,
1419                                 "Setting fan1-3 to 16-bit mode\n");
1420                         it87_write_value(data, IT87_REG_FAN_16BIT,
1421                                          tmp | 0x07);
1422                 }
1423                 /* IT8705F only supports three fans. */
1424                 if (data->type != it87) {
1425                         if (tmp & (1 << 4))
1426                                 data->has_fan |= (1 << 3); /* fan4 enabled */
1427                         if (tmp & (1 << 5))
1428                                 data->has_fan |= (1 << 4); /* fan5 enabled */
1429                 }
1430         }
1431
1432         /* Set current fan mode registers and the default settings for the
1433          * other mode registers */
1434         for (i = 0; i < 3; i++) {
1435                 if (data->fan_main_ctrl & (1 << i)) {
1436                         /* pwm mode */
1437                         tmp = it87_read_value(data, IT87_REG_PWM(i));
1438                         if (tmp & 0x80) {
1439                                 /* automatic pwm - not yet implemented, but
1440                                  * leave the settings made by the BIOS alone
1441                                  * until a change is requested via the sysfs
1442                                  * interface */
1443                         } else {
1444                                 /* manual pwm */
1445                                 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1446                         }
1447                 }
1448         }
1449
1450         /* Start monitoring */
1451         it87_write_value(data, IT87_REG_CONFIG,
1452                          (it87_read_value(data, IT87_REG_CONFIG) & 0x36)
1453                          | (update_vbat ? 0x41 : 0x01));
1454 }
1455
1456 static struct it87_data *it87_update_device(struct device *dev)
1457 {
1458         struct it87_data *data = dev_get_drvdata(dev);
1459         int i;
1460
1461         mutex_lock(&data->update_lock);
1462
1463         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1464             || !data->valid) {
1465
1466                 if (update_vbat) {
1467                         /* Cleared after each update, so reenable.  Value
1468                           returned by this read will be previous value */
1469                         it87_write_value(data, IT87_REG_CONFIG,
1470                            it87_read_value(data, IT87_REG_CONFIG) | 0x40);
1471                 }
1472                 for (i = 0; i <= 7; i++) {
1473                         data->in[i] =
1474                             it87_read_value(data, IT87_REG_VIN(i));
1475                         data->in_min[i] =
1476                             it87_read_value(data, IT87_REG_VIN_MIN(i));
1477                         data->in_max[i] =
1478                             it87_read_value(data, IT87_REG_VIN_MAX(i));
1479                 }
1480                 /* in8 (battery) has no limit registers */
1481                 data->in[8] =
1482                     it87_read_value(data, IT87_REG_VIN(8));
1483
1484                 for (i = 0; i < 5; i++) {
1485                         /* Skip disabled fans */
1486                         if (!(data->has_fan & (1 << i)))
1487                                 continue;
1488
1489                         data->fan_min[i] =
1490                             it87_read_value(data, IT87_REG_FAN_MIN[i]);
1491                         data->fan[i] = it87_read_value(data,
1492                                        IT87_REG_FAN[i]);
1493                         /* Add high byte if in 16-bit mode */
1494                         if (has_16bit_fans(data)) {
1495                                 data->fan[i] |= it87_read_value(data,
1496                                                 IT87_REG_FANX[i]) << 8;
1497                                 data->fan_min[i] |= it87_read_value(data,
1498                                                 IT87_REG_FANX_MIN[i]) << 8;
1499                         }
1500                 }
1501                 for (i = 0; i < 3; i++) {
1502                         data->temp[i] =
1503                             it87_read_value(data, IT87_REG_TEMP(i));
1504                         data->temp_high[i] =
1505                             it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1506                         data->temp_low[i] =
1507                             it87_read_value(data, IT87_REG_TEMP_LOW(i));
1508                 }
1509
1510                 /* Newer chips don't have clock dividers */
1511                 if ((data->has_fan & 0x07) && !has_16bit_fans(data)) {
1512                         i = it87_read_value(data, IT87_REG_FAN_DIV);
1513                         data->fan_div[0] = i & 0x07;
1514                         data->fan_div[1] = (i >> 3) & 0x07;
1515                         data->fan_div[2] = (i & 0x40) ? 3 : 1;
1516                 }
1517
1518                 data->alarms =
1519                         it87_read_value(data, IT87_REG_ALARM1) |
1520                         (it87_read_value(data, IT87_REG_ALARM2) << 8) |
1521                         (it87_read_value(data, IT87_REG_ALARM3) << 16);
1522                 data->fan_main_ctrl = it87_read_value(data,
1523                                 IT87_REG_FAN_MAIN_CTRL);
1524                 data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
1525
1526                 data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1527                 /* The 8705 does not have VID capability.
1528                    The 8718 and the 8720 don't use IT87_REG_VID for the
1529                    same purpose. */
1530                 if (data->type == it8712 || data->type == it8716) {
1531                         data->vid = it87_read_value(data, IT87_REG_VID);
1532                         /* The older IT8712F revisions had only 5 VID pins,
1533                            but we assume it is always safe to read 6 bits. */
1534                         data->vid &= 0x3f;
1535                 }
1536                 data->last_updated = jiffies;
1537                 data->valid = 1;
1538         }
1539
1540         mutex_unlock(&data->update_lock);
1541
1542         return data;
1543 }
1544
1545 static int __init it87_device_add(unsigned short address,
1546                                   const struct it87_sio_data *sio_data)
1547 {
1548         struct resource res = {
1549                 .start  = address + IT87_EC_OFFSET,
1550                 .end    = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1,
1551                 .name   = DRVNAME,
1552                 .flags  = IORESOURCE_IO,
1553         };
1554         int err;
1555
1556         err = acpi_check_resource_conflict(&res);
1557         if (err)
1558                 goto exit;
1559
1560         pdev = platform_device_alloc(DRVNAME, address);
1561         if (!pdev) {
1562                 err = -ENOMEM;
1563                 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
1564                 goto exit;
1565         }
1566
1567         err = platform_device_add_resources(pdev, &res, 1);
1568         if (err) {
1569                 printk(KERN_ERR DRVNAME ": Device resource addition failed "
1570                        "(%d)\n", err);
1571                 goto exit_device_put;
1572         }
1573
1574         err = platform_device_add_data(pdev, sio_data,
1575                                        sizeof(struct it87_sio_data));
1576         if (err) {
1577                 printk(KERN_ERR DRVNAME ": Platform data allocation failed\n");
1578                 goto exit_device_put;
1579         }
1580
1581         err = platform_device_add(pdev);
1582         if (err) {
1583                 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
1584                        err);
1585                 goto exit_device_put;
1586         }
1587
1588         return 0;
1589
1590 exit_device_put:
1591         platform_device_put(pdev);
1592 exit:
1593         return err;
1594 }
1595
1596 static int __init sm_it87_init(void)
1597 {
1598         int err;
1599         unsigned short isa_address=0;
1600         struct it87_sio_data sio_data;
1601
1602         memset(&sio_data, 0, sizeof(struct it87_sio_data));
1603         err = it87_find(&isa_address, &sio_data);
1604         if (err)
1605                 return err;
1606         err = platform_driver_register(&it87_driver);
1607         if (err)
1608                 return err;
1609
1610         err = it87_device_add(isa_address, &sio_data);
1611         if (err){
1612                 platform_driver_unregister(&it87_driver);
1613                 return err;
1614         }
1615
1616         return 0;
1617 }
1618
1619 static void __exit sm_it87_exit(void)
1620 {
1621         platform_device_unregister(pdev);
1622         platform_driver_unregister(&it87_driver);
1623 }
1624
1625
1626 MODULE_AUTHOR("Chris Gauthron, "
1627               "Jean Delvare <khali@linux-fr.org>");
1628 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8720F/8726F, SiS950 driver");
1629 module_param(update_vbat, bool, 0);
1630 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1631 module_param(fix_pwm_polarity, bool, 0);
1632 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1633 MODULE_LICENSE("GPL");
1634
1635 module_init(sm_it87_init);
1636 module_exit(sm_it87_exit);