linux/drivers/hwmon/vt8231.c
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   1/*
   2 * vt8231.c - Part of lm_sensors, Linux kernel modules
   3 *            for hardware monitoring
   4 *
   5 * Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk>
   6 * Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
   7 *                    Aaron M. Marsh <amarsh@sdf.lonestar.org>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24/*
  25 * Supports VIA VT8231 South Bridge embedded sensors
  26 */
  27
  28#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  29
  30#include <linux/module.h>
  31#include <linux/init.h>
  32#include <linux/slab.h>
  33#include <linux/pci.h>
  34#include <linux/jiffies.h>
  35#include <linux/platform_device.h>
  36#include <linux/hwmon.h>
  37#include <linux/hwmon-sysfs.h>
  38#include <linux/hwmon-vid.h>
  39#include <linux/err.h>
  40#include <linux/mutex.h>
  41#include <linux/acpi.h>
  42#include <linux/io.h>
  43
  44static int force_addr;
  45module_param(force_addr, int, 0);
  46MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
  47
  48static struct platform_device *pdev;
  49
  50#define VT8231_EXTENT 0x80
  51#define VT8231_BASE_REG 0x70
  52#define VT8231_ENABLE_REG 0x74
  53
  54/*
  55 * The VT8231 registers
  56 *
  57 * The reset value for the input channel configuration is used (Reg 0x4A=0x07)
  58 * which sets the selected inputs marked with '*' below if multiple options are
  59 * possible:
  60 *
  61 *                  Voltage Mode          Temperature Mode
  62 *      Sensor        Linux Id        Linux Id        VIA Id
  63 *      --------      --------        --------        ------
  64 *      CPU Diode       N/A             temp1           0
  65 *      UIC1            in0             temp2 *         1
  66 *      UIC2            in1 *           temp3           2
  67 *      UIC3            in2 *           temp4           3
  68 *      UIC4            in3 *           temp5           4
  69 *      UIC5            in4 *           temp6           5
  70 *      3.3V            in5             N/A
  71 *
  72 * Note that the BIOS may set the configuration register to a different value
  73 * to match the motherboard configuration.
  74 */
  75
  76/* fans numbered 0-1 */
  77#define VT8231_REG_FAN_MIN(nr)  (0x3b + (nr))
  78#define VT8231_REG_FAN(nr)      (0x29 + (nr))
  79
  80/* Voltage inputs numbered 0-5 */
  81
  82static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
  83static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
  84static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
  85
  86/*
  87 * Temperatures are numbered 1-6 according to the Linux kernel specification.
  88 *
  89 * In the VIA datasheet, however, the temperatures are numbered from zero.
  90 * Since it is important that this driver can easily be compared to the VIA
  91 * datasheet, we will use the VIA numbering within this driver and map the
  92 * kernel sysfs device name to the VIA number in the sysfs callback.
  93 */
  94
  95#define VT8231_REG_TEMP_LOW01   0x49
  96#define VT8231_REG_TEMP_LOW25   0x4d
  97
  98static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
  99static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
 100static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
 101
 102#define TEMP_FROM_REG(reg)              (((253 * 4 - (reg)) * 550 + 105) / 210)
 103#define TEMP_MAXMIN_FROM_REG(reg)       (((253 - (reg)) * 2200 + 105) / 210)
 104#define TEMP_MAXMIN_TO_REG(val)         (253 - ((val) * 210 + 1100) / 2200)
 105
 106#define VT8231_REG_CONFIG 0x40
 107#define VT8231_REG_ALARM1 0x41
 108#define VT8231_REG_ALARM2 0x42
 109#define VT8231_REG_FANDIV 0x47
 110#define VT8231_REG_UCH_CONFIG 0x4a
 111#define VT8231_REG_TEMP1_CONFIG 0x4b
 112#define VT8231_REG_TEMP2_CONFIG 0x4c
 113
 114/*
 115 * temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
 116 * numbering
 117 */
 118#define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
 119                              ((ch_config) >> ((i)+1)) & 0x01)
 120/* voltages 0-5 */
 121#define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
 122                              !(((ch_config) >> ((i)+2)) & 0x01))
 123
 124#define DIV_FROM_REG(val) (1 << (val))
 125
 126/*
 127 * NB  The values returned here are NOT temperatures.  The calibration curves
 128 *     for the thermistor curves are board-specific and must go in the
 129 *     sensors.conf file.  Temperature sensors are actually ten bits, but the
 130 *     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
 131 *     register.  The temperature value returned should have a magnitude of 3,
 132 *     so we use the VIA scaling as the "true" scaling and use the remaining 2
 133 *     LSBs as fractional precision.
 134 *
 135 *     All the on-chip hardware temperature comparisons for the alarms are only
 136 *     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
 137 *     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
 138 *     ignored.
 139 */
 140
 141/*
 142 ****** FAN RPM CONVERSIONS ********
 143 * This chip saturates back at 0, not at 255 like many the other chips.
 144 * So, 0 means 0 RPM
 145 */
 146static inline u8 FAN_TO_REG(long rpm, int div)
 147{
 148        if (rpm == 0)
 149                return 0;
 150        return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
 151}
 152
 153#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
 154
 155struct vt8231_data {
 156        unsigned short addr;
 157        const char *name;
 158
 159        struct mutex update_lock;
 160        struct device *hwmon_dev;
 161        char valid;             /* !=0 if following fields are valid */
 162        unsigned long last_updated;     /* In jiffies */
 163
 164        u8 in[6];               /* Register value */
 165        u8 in_max[6];           /* Register value */
 166        u8 in_min[6];           /* Register value */
 167        u16 temp[6];            /* Register value 10 bit, right aligned */
 168        u8 temp_max[6];         /* Register value */
 169        u8 temp_min[6];         /* Register value */
 170        u8 fan[2];              /* Register value */
 171        u8 fan_min[2];          /* Register value */
 172        u8 fan_div[2];          /* Register encoding, shifted right */
 173        u16 alarms;             /* Register encoding */
 174        u8 uch_config;
 175};
 176
 177static struct pci_dev *s_bridge;
 178static int vt8231_probe(struct platform_device *pdev);
 179static int __devexit vt8231_remove(struct platform_device *pdev);
 180static struct vt8231_data *vt8231_update_device(struct device *dev);
 181static void vt8231_init_device(struct vt8231_data *data);
 182
 183static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
 184{
 185        return inb_p(data->addr + reg);
 186}
 187
 188static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
 189                                        u8 value)
 190{
 191        outb_p(value, data->addr + reg);
 192}
 193
 194/* following are the sysfs callback functions */
 195static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 196                char *buf)
 197{
 198        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 199        int nr = sensor_attr->index;
 200        struct vt8231_data *data = vt8231_update_device(dev);
 201
 202        return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
 203}
 204
 205static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 206                char *buf)
 207{
 208        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 209        int nr = sensor_attr->index;
 210        struct vt8231_data *data = vt8231_update_device(dev);
 211
 212        return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
 213}
 214
 215static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 216                char *buf)
 217{
 218        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 219        int nr = sensor_attr->index;
 220        struct vt8231_data *data = vt8231_update_device(dev);
 221
 222        return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
 223}
 224
 225static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 226                const char *buf, size_t count)
 227{
 228        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 229        int nr = sensor_attr->index;
 230        struct vt8231_data *data = dev_get_drvdata(dev);
 231        unsigned long val;
 232        int err;
 233
 234        err = kstrtoul(buf, 10, &val);
 235        if (err)
 236                return err;
 237
 238        mutex_lock(&data->update_lock);
 239        data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 240        vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
 241        mutex_unlock(&data->update_lock);
 242        return count;
 243}
 244
 245static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 246                const char *buf, size_t count)
 247{
 248        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 249        int nr = sensor_attr->index;
 250        struct vt8231_data *data = dev_get_drvdata(dev);
 251        unsigned long val;
 252        int err;
 253
 254        err = kstrtoul(buf, 10, &val);
 255        if (err)
 256                return err;
 257
 258        mutex_lock(&data->update_lock);
 259        data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 260        vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
 261        mutex_unlock(&data->update_lock);
 262        return count;
 263}
 264
 265/* Special case for input 5 as this has 3.3V scaling built into the chip */
 266static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
 267                char *buf)
 268{
 269        struct vt8231_data *data = vt8231_update_device(dev);
 270
 271        return sprintf(buf, "%d\n",
 272                (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
 273}
 274
 275static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
 276                char *buf)
 277{
 278        struct vt8231_data *data = vt8231_update_device(dev);
 279
 280        return sprintf(buf, "%d\n",
 281                (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
 282}
 283
 284static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
 285                char *buf)
 286{
 287        struct vt8231_data *data = vt8231_update_device(dev);
 288
 289        return sprintf(buf, "%d\n",
 290                (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
 291}
 292
 293static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
 294                const char *buf, size_t count)
 295{
 296        struct vt8231_data *data = dev_get_drvdata(dev);
 297        unsigned long val;
 298        int err;
 299
 300        err = kstrtoul(buf, 10, &val);
 301        if (err)
 302                return err;
 303
 304        mutex_lock(&data->update_lock);
 305        data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 306                                        0, 255);
 307        vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
 308        mutex_unlock(&data->update_lock);
 309        return count;
 310}
 311
 312static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
 313                const char *buf, size_t count)
 314{
 315        struct vt8231_data *data = dev_get_drvdata(dev);
 316        unsigned long val;
 317        int err;
 318
 319        err = kstrtoul(buf, 10, &val);
 320        if (err)
 321                return err;
 322
 323        mutex_lock(&data->update_lock);
 324        data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 325                                        0, 255);
 326        vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
 327        mutex_unlock(&data->update_lock);
 328        return count;
 329}
 330
 331#define define_voltage_sysfs(offset)                            \
 332static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 333                show_in, NULL, offset);                         \
 334static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 335                show_in_min, set_in_min, offset);               \
 336static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 337                show_in_max, set_in_max, offset)
 338
 339define_voltage_sysfs(0);
 340define_voltage_sysfs(1);
 341define_voltage_sysfs(2);
 342define_voltage_sysfs(3);
 343define_voltage_sysfs(4);
 344
 345static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
 346static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
 347static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
 348
 349/* Temperatures */
 350static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
 351                char *buf)
 352{
 353        struct vt8231_data *data = vt8231_update_device(dev);
 354        return sprintf(buf, "%d\n", data->temp[0] * 250);
 355}
 356
 357static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
 358                char *buf)
 359{
 360        struct vt8231_data *data = vt8231_update_device(dev);
 361        return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
 362}
 363
 364static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
 365                char *buf)
 366{
 367        struct vt8231_data *data = vt8231_update_device(dev);
 368        return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
 369}
 370
 371static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
 372                const char *buf, size_t count)
 373{
 374        struct vt8231_data *data = dev_get_drvdata(dev);
 375        long val;
 376        int err;
 377
 378        err = kstrtol(buf, 10, &val);
 379        if (err)
 380                return err;
 381
 382        mutex_lock(&data->update_lock);
 383        data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 384        vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
 385        mutex_unlock(&data->update_lock);
 386        return count;
 387}
 388static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
 389                const char *buf, size_t count)
 390{
 391        struct vt8231_data *data = dev_get_drvdata(dev);
 392        long val;
 393        int err;
 394
 395        err = kstrtol(buf, 10, &val);
 396        if (err)
 397                return err;
 398
 399        mutex_lock(&data->update_lock);
 400        data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 401        vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
 402        mutex_unlock(&data->update_lock);
 403        return count;
 404}
 405
 406static 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        struct vt8231_data *data = vt8231_update_device(dev);
 412        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 413}
 414
 415static 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        struct vt8231_data *data = vt8231_update_device(dev);
 421        return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
 422}
 423
 424static 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        struct vt8231_data *data = vt8231_update_device(dev);
 430        return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
 431}
 432
 433static 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        struct vt8231_data *data = dev_get_drvdata(dev);
 439        long val;
 440        int err;
 441
 442        err = kstrtol(buf, 10, &val);
 443        if (err)
 444                return err;
 445
 446        mutex_lock(&data->update_lock);
 447        data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 448        vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
 449        mutex_unlock(&data->update_lock);
 450        return count;
 451}
 452static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 453                const char *buf, size_t count)
 454{
 455        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 456        int nr = sensor_attr->index;
 457        struct vt8231_data *data = dev_get_drvdata(dev);
 458        long val;
 459        int err;
 460
 461        err = kstrtol(buf, 10, &val);
 462        if (err)
 463                return err;
 464
 465        mutex_lock(&data->update_lock);
 466        data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 467        vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
 468        mutex_unlock(&data->update_lock);
 469        return count;
 470}
 471
 472/*
 473 * Note that these map the Linux temperature sensor numbering (1-6) to the VIA
 474 * temperature sensor numbering (0-5)
 475 */
 476#define define_temperature_sysfs(offset)                                \
 477static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
 478                show_temp, NULL, offset - 1);                           \
 479static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 480                show_temp_max, set_temp_max, offset - 1);               \
 481static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,   \
 482                show_temp_min, set_temp_min, offset - 1)
 483
 484static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
 485static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
 486static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min,
 487                   set_temp0_min);
 488
 489define_temperature_sysfs(2);
 490define_temperature_sysfs(3);
 491define_temperature_sysfs(4);
 492define_temperature_sysfs(5);
 493define_temperature_sysfs(6);
 494
 495/* Fans */
 496static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 497                char *buf)
 498{
 499        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 500        int nr = sensor_attr->index;
 501        struct vt8231_data *data = vt8231_update_device(dev);
 502        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 503                                DIV_FROM_REG(data->fan_div[nr])));
 504}
 505
 506static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 507                char *buf)
 508{
 509        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 510        int nr = sensor_attr->index;
 511        struct vt8231_data *data = vt8231_update_device(dev);
 512        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 513                        DIV_FROM_REG(data->fan_div[nr])));
 514}
 515
 516static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 517                char *buf)
 518{
 519        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 520        int nr = sensor_attr->index;
 521        struct vt8231_data *data = vt8231_update_device(dev);
 522        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 523}
 524
 525static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 526                const char *buf, size_t count)
 527{
 528        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 529        int nr = sensor_attr->index;
 530        struct vt8231_data *data = dev_get_drvdata(dev);
 531        unsigned long val;
 532        int err;
 533
 534        err = kstrtoul(buf, 10, &val);
 535        if (err)
 536                return err;
 537
 538        mutex_lock(&data->update_lock);
 539        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 540        vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 541        mutex_unlock(&data->update_lock);
 542        return count;
 543}
 544
 545static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 546                const char *buf, size_t count)
 547{
 548        struct vt8231_data *data = dev_get_drvdata(dev);
 549        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 550        unsigned long val;
 551        int nr = sensor_attr->index;
 552        int old = vt8231_read_value(data, VT8231_REG_FANDIV);
 553        long min = FAN_FROM_REG(data->fan_min[nr],
 554                                 DIV_FROM_REG(data->fan_div[nr]));
 555        int err;
 556
 557        err = kstrtoul(buf, 10, &val);
 558        if (err)
 559                return err;
 560
 561        mutex_lock(&data->update_lock);
 562        switch (val) {
 563        case 1:
 564                data->fan_div[nr] = 0;
 565                break;
 566        case 2:
 567                data->fan_div[nr] = 1;
 568                break;
 569        case 4:
 570                data->fan_div[nr] = 2;
 571                break;
 572        case 8:
 573                data->fan_div[nr] = 3;
 574                break;
 575        default:
 576                dev_err(dev, "fan_div value %ld not supported. "
 577                        "Choose one of 1, 2, 4 or 8!\n", val);
 578                mutex_unlock(&data->update_lock);
 579                return -EINVAL;
 580        }
 581
 582        /* Correct the fan minimum speed */
 583        data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 584        vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 585
 586        old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 587        vt8231_write_value(data, VT8231_REG_FANDIV, old);
 588        mutex_unlock(&data->update_lock);
 589        return count;
 590}
 591
 592
 593#define define_fan_sysfs(offset)                                        \
 594static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,                 \
 595                show_fan, NULL, offset - 1);                            \
 596static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,         \
 597                show_fan_div, set_fan_div, offset - 1);                 \
 598static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,         \
 599                show_fan_min, set_fan_min, offset - 1)
 600
 601define_fan_sysfs(1);
 602define_fan_sysfs(2);
 603
 604/* Alarms */
 605static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 606                           char *buf)
 607{
 608        struct vt8231_data *data = vt8231_update_device(dev);
 609        return sprintf(buf, "%d\n", data->alarms);
 610}
 611static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 612
 613static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 614                          char *buf)
 615{
 616        int bitnr = to_sensor_dev_attr(attr)->index;
 617        struct vt8231_data *data = vt8231_update_device(dev);
 618        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 619}
 620static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 621static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11);
 622static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0);
 623static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, 1);
 624static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, 3);
 625static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, 8);
 626static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 11);
 627static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0);
 628static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 1);
 629static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 630static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 631static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 2);
 632static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 633static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 634
 635static ssize_t show_name(struct device *dev, struct device_attribute
 636                         *devattr, char *buf)
 637{
 638        struct vt8231_data *data = dev_get_drvdata(dev);
 639        return sprintf(buf, "%s\n", data->name);
 640}
 641static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 642
 643static struct attribute *vt8231_attributes_temps[6][5] = {
 644        {
 645                &dev_attr_temp1_input.attr,
 646                &dev_attr_temp1_max_hyst.attr,
 647                &dev_attr_temp1_max.attr,
 648                &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 649                NULL
 650        }, {
 651                &sensor_dev_attr_temp2_input.dev_attr.attr,
 652                &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 653                &sensor_dev_attr_temp2_max.dev_attr.attr,
 654                &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 655                NULL
 656        }, {
 657                &sensor_dev_attr_temp3_input.dev_attr.attr,
 658                &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 659                &sensor_dev_attr_temp3_max.dev_attr.attr,
 660                &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 661                NULL
 662        }, {
 663                &sensor_dev_attr_temp4_input.dev_attr.attr,
 664                &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 665                &sensor_dev_attr_temp4_max.dev_attr.attr,
 666                &sensor_dev_attr_temp4_alarm.dev_attr.attr,
 667                NULL
 668        }, {
 669                &sensor_dev_attr_temp5_input.dev_attr.attr,
 670                &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 671                &sensor_dev_attr_temp5_max.dev_attr.attr,
 672                &sensor_dev_attr_temp5_alarm.dev_attr.attr,
 673                NULL
 674        }, {
 675                &sensor_dev_attr_temp6_input.dev_attr.attr,
 676                &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
 677                &sensor_dev_attr_temp6_max.dev_attr.attr,
 678                &sensor_dev_attr_temp6_alarm.dev_attr.attr,
 679                NULL
 680        }
 681};
 682
 683static const struct attribute_group vt8231_group_temps[6] = {
 684        { .attrs = vt8231_attributes_temps[0] },
 685        { .attrs = vt8231_attributes_temps[1] },
 686        { .attrs = vt8231_attributes_temps[2] },
 687        { .attrs = vt8231_attributes_temps[3] },
 688        { .attrs = vt8231_attributes_temps[4] },
 689        { .attrs = vt8231_attributes_temps[5] },
 690};
 691
 692static struct attribute *vt8231_attributes_volts[6][5] = {
 693        {
 694                &sensor_dev_attr_in0_input.dev_attr.attr,
 695                &sensor_dev_attr_in0_min.dev_attr.attr,
 696                &sensor_dev_attr_in0_max.dev_attr.attr,
 697                &sensor_dev_attr_in0_alarm.dev_attr.attr,
 698                NULL
 699        }, {
 700                &sensor_dev_attr_in1_input.dev_attr.attr,
 701                &sensor_dev_attr_in1_min.dev_attr.attr,
 702                &sensor_dev_attr_in1_max.dev_attr.attr,
 703                &sensor_dev_attr_in1_alarm.dev_attr.attr,
 704                NULL
 705        }, {
 706                &sensor_dev_attr_in2_input.dev_attr.attr,
 707                &sensor_dev_attr_in2_min.dev_attr.attr,
 708                &sensor_dev_attr_in2_max.dev_attr.attr,
 709                &sensor_dev_attr_in2_alarm.dev_attr.attr,
 710                NULL
 711        }, {
 712                &sensor_dev_attr_in3_input.dev_attr.attr,
 713                &sensor_dev_attr_in3_min.dev_attr.attr,
 714                &sensor_dev_attr_in3_max.dev_attr.attr,
 715                &sensor_dev_attr_in3_alarm.dev_attr.attr,
 716                NULL
 717        }, {
 718                &sensor_dev_attr_in4_input.dev_attr.attr,
 719                &sensor_dev_attr_in4_min.dev_attr.attr,
 720                &sensor_dev_attr_in4_max.dev_attr.attr,
 721                &sensor_dev_attr_in4_alarm.dev_attr.attr,
 722                NULL
 723        }, {
 724                &dev_attr_in5_input.attr,
 725                &dev_attr_in5_min.attr,
 726                &dev_attr_in5_max.attr,
 727                &sensor_dev_attr_in5_alarm.dev_attr.attr,
 728                NULL
 729        }
 730};
 731
 732static const struct attribute_group vt8231_group_volts[6] = {
 733        { .attrs = vt8231_attributes_volts[0] },
 734        { .attrs = vt8231_attributes_volts[1] },
 735        { .attrs = vt8231_attributes_volts[2] },
 736        { .attrs = vt8231_attributes_volts[3] },
 737        { .attrs = vt8231_attributes_volts[4] },
 738        { .attrs = vt8231_attributes_volts[5] },
 739};
 740
 741static struct attribute *vt8231_attributes[] = {
 742        &sensor_dev_attr_fan1_input.dev_attr.attr,
 743        &sensor_dev_attr_fan2_input.dev_attr.attr,
 744        &sensor_dev_attr_fan1_min.dev_attr.attr,
 745        &sensor_dev_attr_fan2_min.dev_attr.attr,
 746        &sensor_dev_attr_fan1_div.dev_attr.attr,
 747        &sensor_dev_attr_fan2_div.dev_attr.attr,
 748        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 749        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 750        &dev_attr_alarms.attr,
 751        &dev_attr_name.attr,
 752        NULL
 753};
 754
 755static const struct attribute_group vt8231_group = {
 756        .attrs = vt8231_attributes,
 757};
 758
 759static struct platform_driver vt8231_driver = {
 760        .driver = {
 761                .owner  = THIS_MODULE,
 762                .name   = "vt8231",
 763        },
 764        .probe  = vt8231_probe,
 765        .remove = __devexit_p(vt8231_remove),
 766};
 767
 768static DEFINE_PCI_DEVICE_TABLE(vt8231_pci_ids) = {
 769        { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
 770        { 0, }
 771};
 772
 773MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
 774
 775static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 776                                      const struct pci_device_id *id);
 777
 778static struct pci_driver vt8231_pci_driver = {
 779        .name           = "vt8231",
 780        .id_table       = vt8231_pci_ids,
 781        .probe          = vt8231_pci_probe,
 782};
 783
 784static int vt8231_probe(struct platform_device *pdev)
 785{
 786        struct resource *res;
 787        struct vt8231_data *data;
 788        int err = 0, i;
 789
 790        /* Reserve the ISA region */
 791        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 792        if (!request_region(res->start, VT8231_EXTENT,
 793                            vt8231_driver.driver.name)) {
 794                dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
 795                        (unsigned long)res->start, (unsigned long)res->end);
 796                return -ENODEV;
 797        }
 798
 799        data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL);
 800        if (!data) {
 801                err = -ENOMEM;
 802                goto exit_release;
 803        }
 804
 805        platform_set_drvdata(pdev, data);
 806        data->addr = res->start;
 807        data->name = "vt8231";
 808
 809        mutex_init(&data->update_lock);
 810        vt8231_init_device(data);
 811
 812        /* Register sysfs hooks */
 813        err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group);
 814        if (err)
 815                goto exit_free;
 816
 817        /* Must update device information to find out the config field */
 818        data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
 819
 820        for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
 821                if (ISTEMP(i, data->uch_config)) {
 822                        err = sysfs_create_group(&pdev->dev.kobj,
 823                                                 &vt8231_group_temps[i]);
 824                        if (err)
 825                                goto exit_remove_files;
 826                }
 827        }
 828
 829        for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
 830                if (ISVOLT(i, data->uch_config)) {
 831                        err = sysfs_create_group(&pdev->dev.kobj,
 832                                                 &vt8231_group_volts[i]);
 833                        if (err)
 834                                goto exit_remove_files;
 835                }
 836        }
 837
 838        data->hwmon_dev = hwmon_device_register(&pdev->dev);
 839        if (IS_ERR(data->hwmon_dev)) {
 840                err = PTR_ERR(data->hwmon_dev);
 841                goto exit_remove_files;
 842        }
 843        return 0;
 844
 845exit_remove_files:
 846        for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 847                sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
 848
 849        for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 850                sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
 851
 852        sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
 853
 854exit_free:
 855        platform_set_drvdata(pdev, NULL);
 856        kfree(data);
 857
 858exit_release:
 859        release_region(res->start, VT8231_EXTENT);
 860        return err;
 861}
 862
 863static int __devexit vt8231_remove(struct platform_device *pdev)
 864{
 865        struct vt8231_data *data = platform_get_drvdata(pdev);
 866        int i;
 867
 868        hwmon_device_unregister(data->hwmon_dev);
 869
 870        for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 871                sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
 872
 873        for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 874                sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
 875
 876        sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
 877
 878        release_region(data->addr, VT8231_EXTENT);
 879        platform_set_drvdata(pdev, NULL);
 880        kfree(data);
 881        return 0;
 882}
 883
 884static void vt8231_init_device(struct vt8231_data *data)
 885{
 886        vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
 887        vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
 888}
 889
 890static struct vt8231_data *vt8231_update_device(struct device *dev)
 891{
 892        struct vt8231_data *data = dev_get_drvdata(dev);
 893        int i;
 894        u16 low;
 895
 896        mutex_lock(&data->update_lock);
 897
 898        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 899            || !data->valid) {
 900                for (i = 0; i < 6; i++) {
 901                        if (ISVOLT(i, data->uch_config)) {
 902                                data->in[i] = vt8231_read_value(data,
 903                                                regvolt[i]);
 904                                data->in_min[i] = vt8231_read_value(data,
 905                                                regvoltmin[i]);
 906                                data->in_max[i] = vt8231_read_value(data,
 907                                                regvoltmax[i]);
 908                        }
 909                }
 910                for (i = 0; i < 2; i++) {
 911                        data->fan[i] = vt8231_read_value(data,
 912                                                VT8231_REG_FAN(i));
 913                        data->fan_min[i] = vt8231_read_value(data,
 914                                                VT8231_REG_FAN_MIN(i));
 915                }
 916
 917                low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
 918                low = (low >> 6) | ((low & 0x30) >> 2)
 919                    | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
 920                for (i = 0; i < 6; i++) {
 921                        if (ISTEMP(i, data->uch_config)) {
 922                                data->temp[i] = (vt8231_read_value(data,
 923                                                       regtemp[i]) << 2)
 924                                                | ((low >> (2 * i)) & 0x03);
 925                                data->temp_max[i] = vt8231_read_value(data,
 926                                                      regtempmax[i]);
 927                                data->temp_min[i] = vt8231_read_value(data,
 928                                                      regtempmin[i]);
 929                        }
 930                }
 931
 932                i = vt8231_read_value(data, VT8231_REG_FANDIV);
 933                data->fan_div[0] = (i >> 4) & 0x03;
 934                data->fan_div[1] = i >> 6;
 935                data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
 936                        (vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
 937
 938                /* Set alarm flags correctly */
 939                if (!data->fan[0] && data->fan_min[0])
 940                        data->alarms |= 0x40;
 941                else if (data->fan[0] && !data->fan_min[0])
 942                        data->alarms &= ~0x40;
 943
 944                if (!data->fan[1] && data->fan_min[1])
 945                        data->alarms |= 0x80;
 946                else if (data->fan[1] && !data->fan_min[1])
 947                        data->alarms &= ~0x80;
 948
 949                data->last_updated = jiffies;
 950                data->valid = 1;
 951        }
 952
 953        mutex_unlock(&data->update_lock);
 954
 955        return data;
 956}
 957
 958static int __devinit vt8231_device_add(unsigned short address)
 959{
 960        struct resource res = {
 961                .start  = address,
 962                .end    = address + VT8231_EXTENT - 1,
 963                .name   = "vt8231",
 964                .flags  = IORESOURCE_IO,
 965        };
 966        int err;
 967
 968        err = acpi_check_resource_conflict(&res);
 969        if (err)
 970                goto exit;
 971
 972        pdev = platform_device_alloc("vt8231", address);
 973        if (!pdev) {
 974                err = -ENOMEM;
 975                pr_err("Device allocation failed\n");
 976                goto exit;
 977        }
 978
 979        err = platform_device_add_resources(pdev, &res, 1);
 980        if (err) {
 981                pr_err("Device resource addition failed (%d)\n", err);
 982                goto exit_device_put;
 983        }
 984
 985        err = platform_device_add(pdev);
 986        if (err) {
 987                pr_err("Device addition failed (%d)\n", err);
 988                goto exit_device_put;
 989        }
 990
 991        return 0;
 992
 993exit_device_put:
 994        platform_device_put(pdev);
 995exit:
 996        return err;
 997}
 998
 999static int __devinit vt8231_pci_probe(struct pci_dev *dev,
1000                                const struct pci_device_id *id)
1001{
1002        u16 address, val;
1003        if (force_addr) {
1004                address = force_addr & 0xff00;
1005                dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
1006                         address);
1007
1008                if (PCIBIOS_SUCCESSFUL !=
1009                    pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
1010                        return -ENODEV;
1011        }
1012
1013        if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
1014                                                        &val))
1015                return -ENODEV;
1016
1017        address = val & ~(VT8231_EXTENT - 1);
1018        if (address == 0) {
1019                dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
1020                return -ENODEV;
1021        }
1022
1023        if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
1024                                                        &val))
1025                return -ENODEV;
1026
1027        if (!(val & 0x0001)) {
1028                dev_warn(&dev->dev, "enabling sensors\n");
1029                if (PCIBIOS_SUCCESSFUL !=
1030                        pci_write_config_word(dev, VT8231_ENABLE_REG,
1031                                                        val | 0x0001))
1032                        return -ENODEV;
1033        }
1034
1035        if (platform_driver_register(&vt8231_driver))
1036                goto exit;
1037
1038        /* Sets global pdev as a side effect */
1039        if (vt8231_device_add(address))
1040                goto exit_unregister;
1041
1042        /*
1043         * Always return failure here.  This is to allow other drivers to bind
1044         * to this pci device.  We don't really want to have control over the
1045         * pci device, we only wanted to read as few register values from it.
1046         */
1047
1048        /*
1049         * We do, however, mark ourselves as using the PCI device to stop it
1050         * getting unloaded.
1051         */
1052        s_bridge = pci_dev_get(dev);
1053        return -ENODEV;
1054
1055exit_unregister:
1056        platform_driver_unregister(&vt8231_driver);
1057exit:
1058        return -ENODEV;
1059}
1060
1061static int __init sm_vt8231_init(void)
1062{
1063        return pci_register_driver(&vt8231_pci_driver);
1064}
1065
1066static void __exit sm_vt8231_exit(void)
1067{
1068        pci_unregister_driver(&vt8231_pci_driver);
1069        if (s_bridge != NULL) {
1070                platform_device_unregister(pdev);
1071                platform_driver_unregister(&vt8231_driver);
1072                pci_dev_put(s_bridge);
1073                s_bridge = NULL;
1074        }
1075}
1076
1077MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
1078MODULE_DESCRIPTION("VT8231 sensors");
1079MODULE_LICENSE("GPL");
1080
1081module_init(sm_vt8231_init);
1082module_exit(sm_vt8231_exit);
1083
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