linux/drivers/hwmon/asb100.c
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   1/*
   2 * asb100.c - Part of lm_sensors, Linux kernel modules for hardware
   3 *            monitoring
   4 *
   5 * Copyright (C) 2004 Mark M. Hoffman <mhoffman@lightlink.com>
   6 *
   7 * (derived from w83781d.c)
   8 *
   9 * Copyright (C) 1998 - 2003  Frodo Looijaard <frodol@dds.nl>,
  10 *                            Philip Edelbrock <phil@netroedge.com>, and
  11 *                            Mark Studebaker <mdsxyz123@yahoo.com>
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26 */
  27
  28/*
  29 * This driver supports the hardware sensor chips: Asus ASB100 and
  30 * ASB100-A "BACH".
  31 *
  32 * ASB100-A supports pwm1, while plain ASB100 does not.  There is no known
  33 * way for the driver to tell which one is there.
  34 *
  35 * Chip #vin    #fanin  #pwm    #temp   wchipid vendid  i2c     ISA
  36 * asb100       7       3       1       4       0x31    0x0694  yes     no
  37 */
  38
  39#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  40
  41#include <linux/module.h>
  42#include <linux/slab.h>
  43#include <linux/i2c.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/init.h>
  49#include <linux/jiffies.h>
  50#include <linux/mutex.h>
  51#include "lm75.h"
  52
  53/* I2C addresses to scan */
  54static const unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
  55
  56static unsigned short force_subclients[4];
  57module_param_array(force_subclients, short, NULL, 0);
  58MODULE_PARM_DESC(force_subclients, "List of subclient addresses: "
  59        "{bus, clientaddr, subclientaddr1, subclientaddr2}");
  60
  61/* Voltage IN registers 0-6 */
  62#define ASB100_REG_IN(nr)       (0x20 + (nr))
  63#define ASB100_REG_IN_MAX(nr)   (0x2b + (nr * 2))
  64#define ASB100_REG_IN_MIN(nr)   (0x2c + (nr * 2))
  65
  66/* FAN IN registers 1-3 */
  67#define ASB100_REG_FAN(nr)      (0x28 + (nr))
  68#define ASB100_REG_FAN_MIN(nr)  (0x3b + (nr))
  69
  70/* TEMPERATURE registers 1-4 */
  71static const u16 asb100_reg_temp[]      = {0, 0x27, 0x150, 0x250, 0x17};
  72static const u16 asb100_reg_temp_max[]  = {0, 0x39, 0x155, 0x255, 0x18};
  73static const u16 asb100_reg_temp_hyst[] = {0, 0x3a, 0x153, 0x253, 0x19};
  74
  75#define ASB100_REG_TEMP(nr) (asb100_reg_temp[nr])
  76#define ASB100_REG_TEMP_MAX(nr) (asb100_reg_temp_max[nr])
  77#define ASB100_REG_TEMP_HYST(nr) (asb100_reg_temp_hyst[nr])
  78
  79#define ASB100_REG_TEMP2_CONFIG 0x0152
  80#define ASB100_REG_TEMP3_CONFIG 0x0252
  81
  82
  83#define ASB100_REG_CONFIG       0x40
  84#define ASB100_REG_ALARM1       0x41
  85#define ASB100_REG_ALARM2       0x42
  86#define ASB100_REG_SMIM1        0x43
  87#define ASB100_REG_SMIM2        0x44
  88#define ASB100_REG_VID_FANDIV   0x47
  89#define ASB100_REG_I2C_ADDR     0x48
  90#define ASB100_REG_CHIPID       0x49
  91#define ASB100_REG_I2C_SUBADDR  0x4a
  92#define ASB100_REG_PIN          0x4b
  93#define ASB100_REG_IRQ          0x4c
  94#define ASB100_REG_BANK         0x4e
  95#define ASB100_REG_CHIPMAN      0x4f
  96
  97#define ASB100_REG_WCHIPID      0x58
  98
  99/* bit 7 -> enable, bits 0-3 -> duty cycle */
 100#define ASB100_REG_PWM1         0x59
 101
 102/*
 103 * CONVERSIONS
 104 * Rounding and limit checking is only done on the TO_REG variants.
 105 */
 106
 107/* These constants are a guess, consistent w/ w83781d */
 108#define ASB100_IN_MIN           0
 109#define ASB100_IN_MAX           4080
 110
 111/*
 112 * IN: 1/1000 V (0V to 4.08V)
 113 * REG: 16mV/bit
 114 */
 115static u8 IN_TO_REG(unsigned val)
 116{
 117        unsigned nval = SENSORS_LIMIT(val, ASB100_IN_MIN, ASB100_IN_MAX);
 118        return (nval + 8) / 16;
 119}
 120
 121static unsigned IN_FROM_REG(u8 reg)
 122{
 123        return reg * 16;
 124}
 125
 126static u8 FAN_TO_REG(long rpm, int div)
 127{
 128        if (rpm == -1)
 129                return 0;
 130        if (rpm == 0)
 131                return 255;
 132        rpm = SENSORS_LIMIT(rpm, 1, 1000000);
 133        return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
 134}
 135
 136static int FAN_FROM_REG(u8 val, int div)
 137{
 138        return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
 139}
 140
 141/* These constants are a guess, consistent w/ w83781d */
 142#define ASB100_TEMP_MIN         -128000
 143#define ASB100_TEMP_MAX         127000
 144
 145/*
 146 * TEMP: 0.001C/bit (-128C to +127C)
 147 * REG: 1C/bit, two's complement
 148 */
 149static u8 TEMP_TO_REG(long temp)
 150{
 151        int ntemp = SENSORS_LIMIT(temp, ASB100_TEMP_MIN, ASB100_TEMP_MAX);
 152        ntemp += (ntemp < 0 ? -500 : 500);
 153        return (u8)(ntemp / 1000);
 154}
 155
 156static int TEMP_FROM_REG(u8 reg)
 157{
 158        return (s8)reg * 1000;
 159}
 160
 161/*
 162 * PWM: 0 - 255 per sensors documentation
 163 * REG: (6.25% duty cycle per bit)
 164 */
 165static u8 ASB100_PWM_TO_REG(int pwm)
 166{
 167        pwm = SENSORS_LIMIT(pwm, 0, 255);
 168        return (u8)(pwm / 16);
 169}
 170
 171static int ASB100_PWM_FROM_REG(u8 reg)
 172{
 173        return reg * 16;
 174}
 175
 176#define DIV_FROM_REG(val) (1 << (val))
 177
 178/*
 179 * FAN DIV: 1, 2, 4, or 8 (defaults to 2)
 180 * REG: 0, 1, 2, or 3 (respectively) (defaults to 1)
 181 */
 182static u8 DIV_TO_REG(long val)
 183{
 184        return val == 8 ? 3 : val == 4 ? 2 : val == 1 ? 0 : 1;
 185}
 186
 187/*
 188 * For each registered client, we need to keep some data in memory. That
 189 * data is pointed to by client->data. The structure itself is
 190 * dynamically allocated, at the same time the client itself is allocated.
 191 */
 192struct asb100_data {
 193        struct device *hwmon_dev;
 194        struct mutex lock;
 195
 196        struct mutex update_lock;
 197        unsigned long last_updated;     /* In jiffies */
 198
 199        /* array of 2 pointers to subclients */
 200        struct i2c_client *lm75[2];
 201
 202        char valid;             /* !=0 if following fields are valid */
 203        u8 in[7];               /* Register value */
 204        u8 in_max[7];           /* Register value */
 205        u8 in_min[7];           /* Register value */
 206        u8 fan[3];              /* Register value */
 207        u8 fan_min[3];          /* Register value */
 208        u16 temp[4];            /* Register value (0 and 3 are u8 only) */
 209        u16 temp_max[4];        /* Register value (0 and 3 are u8 only) */
 210        u16 temp_hyst[4];       /* Register value (0 and 3 are u8 only) */
 211        u8 fan_div[3];          /* Register encoding, right justified */
 212        u8 pwm;                 /* Register encoding */
 213        u8 vid;                 /* Register encoding, combined */
 214        u32 alarms;             /* Register encoding, combined */
 215        u8 vrm;
 216};
 217
 218static int asb100_read_value(struct i2c_client *client, u16 reg);
 219static void asb100_write_value(struct i2c_client *client, u16 reg, u16 val);
 220
 221static int asb100_probe(struct i2c_client *client,
 222                        const struct i2c_device_id *id);
 223static int asb100_detect(struct i2c_client *client,
 224                         struct i2c_board_info *info);
 225static int asb100_remove(struct i2c_client *client);
 226static struct asb100_data *asb100_update_device(struct device *dev);
 227static void asb100_init_client(struct i2c_client *client);
 228
 229static const struct i2c_device_id asb100_id[] = {
 230        { "asb100", 0 },
 231        { }
 232};
 233MODULE_DEVICE_TABLE(i2c, asb100_id);
 234
 235static struct i2c_driver asb100_driver = {
 236        .class          = I2C_CLASS_HWMON,
 237        .driver = {
 238                .name   = "asb100",
 239        },
 240        .probe          = asb100_probe,
 241        .remove         = asb100_remove,
 242        .id_table       = asb100_id,
 243        .detect         = asb100_detect,
 244        .address_list   = normal_i2c,
 245};
 246
 247/* 7 Voltages */
 248#define show_in_reg(reg) \
 249static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 250                char *buf) \
 251{ \
 252        int nr = to_sensor_dev_attr(attr)->index; \
 253        struct asb100_data *data = asb100_update_device(dev); \
 254        return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 255}
 256
 257show_in_reg(in)
 258show_in_reg(in_min)
 259show_in_reg(in_max)
 260
 261#define set_in_reg(REG, reg) \
 262static ssize_t set_in_##reg(struct device *dev, struct device_attribute *attr, \
 263                const char *buf, size_t count) \
 264{ \
 265        int nr = to_sensor_dev_attr(attr)->index; \
 266        struct i2c_client *client = to_i2c_client(dev); \
 267        struct asb100_data *data = i2c_get_clientdata(client); \
 268        unsigned long val; \
 269        int err = kstrtoul(buf, 10, &val); \
 270        if (err) \
 271                return err; \
 272        mutex_lock(&data->update_lock); \
 273        data->in_##reg[nr] = IN_TO_REG(val); \
 274        asb100_write_value(client, ASB100_REG_IN_##REG(nr), \
 275                data->in_##reg[nr]); \
 276        mutex_unlock(&data->update_lock); \
 277        return count; \
 278}
 279
 280set_in_reg(MIN, min)
 281set_in_reg(MAX, max)
 282
 283#define sysfs_in(offset) \
 284static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 285                show_in, NULL, offset); \
 286static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 287                show_in_min, set_in_min, offset); \
 288static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 289                show_in_max, set_in_max, offset)
 290
 291sysfs_in(0);
 292sysfs_in(1);
 293sysfs_in(2);
 294sysfs_in(3);
 295sysfs_in(4);
 296sysfs_in(5);
 297sysfs_in(6);
 298
 299/* 3 Fans */
 300static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 301                char *buf)
 302{
 303        int nr = to_sensor_dev_attr(attr)->index;
 304        struct asb100_data *data = asb100_update_device(dev);
 305        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 306                DIV_FROM_REG(data->fan_div[nr])));
 307}
 308
 309static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 310                char *buf)
 311{
 312        int nr = to_sensor_dev_attr(attr)->index;
 313        struct asb100_data *data = asb100_update_device(dev);
 314        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 315                DIV_FROM_REG(data->fan_div[nr])));
 316}
 317
 318static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 319                char *buf)
 320{
 321        int nr = to_sensor_dev_attr(attr)->index;
 322        struct asb100_data *data = asb100_update_device(dev);
 323        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 324}
 325
 326static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 327                const char *buf, size_t count)
 328{
 329        int nr = to_sensor_dev_attr(attr)->index;
 330        struct i2c_client *client = to_i2c_client(dev);
 331        struct asb100_data *data = i2c_get_clientdata(client);
 332        unsigned long val;
 333        int err;
 334
 335        err = kstrtoul(buf, 10, &val);
 336        if (err)
 337                return err;
 338
 339        mutex_lock(&data->update_lock);
 340        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 341        asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
 342        mutex_unlock(&data->update_lock);
 343        return count;
 344}
 345
 346/*
 347 * Note: we save and restore the fan minimum here, because its value is
 348 * determined in part by the fan divisor.  This follows the principle of
 349 * least surprise; the user doesn't expect the fan minimum to change just
 350 * because the divisor changed.
 351 */
 352static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 353                const char *buf, size_t count)
 354{
 355        int nr = to_sensor_dev_attr(attr)->index;
 356        struct i2c_client *client = to_i2c_client(dev);
 357        struct asb100_data *data = i2c_get_clientdata(client);
 358        unsigned long min;
 359        int reg;
 360        unsigned long val;
 361        int err;
 362
 363        err = kstrtoul(buf, 10, &val);
 364        if (err)
 365                return err;
 366
 367        mutex_lock(&data->update_lock);
 368
 369        min = FAN_FROM_REG(data->fan_min[nr],
 370                        DIV_FROM_REG(data->fan_div[nr]));
 371        data->fan_div[nr] = DIV_TO_REG(val);
 372
 373        switch (nr) {
 374        case 0: /* fan 1 */
 375                reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 376                reg = (reg & 0xcf) | (data->fan_div[0] << 4);
 377                asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
 378                break;
 379
 380        case 1: /* fan 2 */
 381                reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 382                reg = (reg & 0x3f) | (data->fan_div[1] << 6);
 383                asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
 384                break;
 385
 386        case 2: /* fan 3 */
 387                reg = asb100_read_value(client, ASB100_REG_PIN);
 388                reg = (reg & 0x3f) | (data->fan_div[2] << 6);
 389                asb100_write_value(client, ASB100_REG_PIN, reg);
 390                break;
 391        }
 392
 393        data->fan_min[nr] =
 394                FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 395        asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
 396
 397        mutex_unlock(&data->update_lock);
 398
 399        return count;
 400}
 401
 402#define sysfs_fan(offset) \
 403static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 404                show_fan, NULL, offset - 1); \
 405static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 406                show_fan_min, set_fan_min, offset - 1); \
 407static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 408                show_fan_div, set_fan_div, offset - 1)
 409
 410sysfs_fan(1);
 411sysfs_fan(2);
 412sysfs_fan(3);
 413
 414/* 4 Temp. Sensors */
 415static int sprintf_temp_from_reg(u16 reg, char *buf, int nr)
 416{
 417        int ret = 0;
 418
 419        switch (nr) {
 420        case 1: case 2:
 421                ret = sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(reg));
 422                break;
 423        case 0: case 3: default:
 424                ret = sprintf(buf, "%d\n", TEMP_FROM_REG(reg));
 425                break;
 426        }
 427        return ret;
 428}
 429
 430#define show_temp_reg(reg) \
 431static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 432                char *buf) \
 433{ \
 434        int nr = to_sensor_dev_attr(attr)->index; \
 435        struct asb100_data *data = asb100_update_device(dev); \
 436        return sprintf_temp_from_reg(data->reg[nr], buf, nr); \
 437}
 438
 439show_temp_reg(temp);
 440show_temp_reg(temp_max);
 441show_temp_reg(temp_hyst);
 442
 443#define set_temp_reg(REG, reg) \
 444static ssize_t set_##reg(struct device *dev, struct device_attribute *attr, \
 445                const char *buf, size_t count) \
 446{ \
 447        int nr = to_sensor_dev_attr(attr)->index; \
 448        struct i2c_client *client = to_i2c_client(dev); \
 449        struct asb100_data *data = i2c_get_clientdata(client); \
 450        long val; \
 451        int err = kstrtol(buf, 10, &val); \
 452        if (err) \
 453                return err; \
 454        mutex_lock(&data->update_lock); \
 455        switch (nr) { \
 456        case 1: case 2: \
 457                data->reg[nr] = LM75_TEMP_TO_REG(val); \
 458                break; \
 459        case 0: case 3: default: \
 460                data->reg[nr] = TEMP_TO_REG(val); \
 461                break; \
 462        } \
 463        asb100_write_value(client, ASB100_REG_TEMP_##REG(nr+1), \
 464                        data->reg[nr]); \
 465        mutex_unlock(&data->update_lock); \
 466        return count; \
 467}
 468
 469set_temp_reg(MAX, temp_max);
 470set_temp_reg(HYST, temp_hyst);
 471
 472#define sysfs_temp(num) \
 473static SENSOR_DEVICE_ATTR(temp##num##_input, S_IRUGO, \
 474                show_temp, NULL, num - 1); \
 475static SENSOR_DEVICE_ATTR(temp##num##_max, S_IRUGO | S_IWUSR, \
 476                show_temp_max, set_temp_max, num - 1); \
 477static SENSOR_DEVICE_ATTR(temp##num##_max_hyst, S_IRUGO | S_IWUSR, \
 478                show_temp_hyst, set_temp_hyst, num - 1)
 479
 480sysfs_temp(1);
 481sysfs_temp(2);
 482sysfs_temp(3);
 483sysfs_temp(4);
 484
 485/* VID */
 486static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
 487                char *buf)
 488{
 489        struct asb100_data *data = asb100_update_device(dev);
 490        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 491}
 492
 493static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 494
 495/* VRM */
 496static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
 497                char *buf)
 498{
 499        struct asb100_data *data = dev_get_drvdata(dev);
 500        return sprintf(buf, "%d\n", data->vrm);
 501}
 502
 503static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 504                const char *buf, size_t count)
 505{
 506        struct asb100_data *data = dev_get_drvdata(dev);
 507        unsigned long val;
 508        int err;
 509
 510        err = kstrtoul(buf, 10, &val);
 511        if (err)
 512                return err;
 513        data->vrm = val;
 514        return count;
 515}
 516
 517/* Alarms */
 518static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 519
 520static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 521                char *buf)
 522{
 523        struct asb100_data *data = asb100_update_device(dev);
 524        return sprintf(buf, "%u\n", data->alarms);
 525}
 526
 527static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 528
 529static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 530                char *buf)
 531{
 532        int bitnr = to_sensor_dev_attr(attr)->index;
 533        struct asb100_data *data = asb100_update_device(dev);
 534        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 535}
 536static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 537static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 538static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 539static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 540static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 541static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 542static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 543static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
 544static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 545static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 546static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 13);
 547
 548/* 1 PWM */
 549static ssize_t show_pwm1(struct device *dev, struct device_attribute *attr,
 550                char *buf)
 551{
 552        struct asb100_data *data = asb100_update_device(dev);
 553        return sprintf(buf, "%d\n", ASB100_PWM_FROM_REG(data->pwm & 0x0f));
 554}
 555
 556static ssize_t set_pwm1(struct device *dev, struct device_attribute *attr,
 557                const char *buf, size_t count)
 558{
 559        struct i2c_client *client = to_i2c_client(dev);
 560        struct asb100_data *data = i2c_get_clientdata(client);
 561        unsigned long val;
 562        int err;
 563
 564        err = kstrtoul(buf, 10, &val);
 565        if (err)
 566                return err;
 567
 568        mutex_lock(&data->update_lock);
 569        data->pwm &= 0x80; /* keep the enable bit */
 570        data->pwm |= (0x0f & ASB100_PWM_TO_REG(val));
 571        asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
 572        mutex_unlock(&data->update_lock);
 573        return count;
 574}
 575
 576static ssize_t show_pwm_enable1(struct device *dev,
 577                struct device_attribute *attr, char *buf)
 578{
 579        struct asb100_data *data = asb100_update_device(dev);
 580        return sprintf(buf, "%d\n", (data->pwm & 0x80) ? 1 : 0);
 581}
 582
 583static ssize_t set_pwm_enable1(struct device *dev,
 584                struct device_attribute *attr, const char *buf, size_t count)
 585{
 586        struct i2c_client *client = to_i2c_client(dev);
 587        struct asb100_data *data = i2c_get_clientdata(client);
 588        unsigned long val;
 589        int err;
 590
 591        err = kstrtoul(buf, 10, &val);
 592        if (err)
 593                return err;
 594
 595        mutex_lock(&data->update_lock);
 596        data->pwm &= 0x0f; /* keep the duty cycle bits */
 597        data->pwm |= (val ? 0x80 : 0x00);
 598        asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
 599        mutex_unlock(&data->update_lock);
 600        return count;
 601}
 602
 603static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm1, set_pwm1);
 604static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 605                show_pwm_enable1, set_pwm_enable1);
 606
 607static struct attribute *asb100_attributes[] = {
 608        &sensor_dev_attr_in0_input.dev_attr.attr,
 609        &sensor_dev_attr_in0_min.dev_attr.attr,
 610        &sensor_dev_attr_in0_max.dev_attr.attr,
 611        &sensor_dev_attr_in1_input.dev_attr.attr,
 612        &sensor_dev_attr_in1_min.dev_attr.attr,
 613        &sensor_dev_attr_in1_max.dev_attr.attr,
 614        &sensor_dev_attr_in2_input.dev_attr.attr,
 615        &sensor_dev_attr_in2_min.dev_attr.attr,
 616        &sensor_dev_attr_in2_max.dev_attr.attr,
 617        &sensor_dev_attr_in3_input.dev_attr.attr,
 618        &sensor_dev_attr_in3_min.dev_attr.attr,
 619        &sensor_dev_attr_in3_max.dev_attr.attr,
 620        &sensor_dev_attr_in4_input.dev_attr.attr,
 621        &sensor_dev_attr_in4_min.dev_attr.attr,
 622        &sensor_dev_attr_in4_max.dev_attr.attr,
 623        &sensor_dev_attr_in5_input.dev_attr.attr,
 624        &sensor_dev_attr_in5_min.dev_attr.attr,
 625        &sensor_dev_attr_in5_max.dev_attr.attr,
 626        &sensor_dev_attr_in6_input.dev_attr.attr,
 627        &sensor_dev_attr_in6_min.dev_attr.attr,
 628        &sensor_dev_attr_in6_max.dev_attr.attr,
 629
 630        &sensor_dev_attr_fan1_input.dev_attr.attr,
 631        &sensor_dev_attr_fan1_min.dev_attr.attr,
 632        &sensor_dev_attr_fan1_div.dev_attr.attr,
 633        &sensor_dev_attr_fan2_input.dev_attr.attr,
 634        &sensor_dev_attr_fan2_min.dev_attr.attr,
 635        &sensor_dev_attr_fan2_div.dev_attr.attr,
 636        &sensor_dev_attr_fan3_input.dev_attr.attr,
 637        &sensor_dev_attr_fan3_min.dev_attr.attr,
 638        &sensor_dev_attr_fan3_div.dev_attr.attr,
 639
 640        &sensor_dev_attr_temp1_input.dev_attr.attr,
 641        &sensor_dev_attr_temp1_max.dev_attr.attr,
 642        &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 643        &sensor_dev_attr_temp2_input.dev_attr.attr,
 644        &sensor_dev_attr_temp2_max.dev_attr.attr,
 645        &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 646        &sensor_dev_attr_temp3_input.dev_attr.attr,
 647        &sensor_dev_attr_temp3_max.dev_attr.attr,
 648        &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 649        &sensor_dev_attr_temp4_input.dev_attr.attr,
 650        &sensor_dev_attr_temp4_max.dev_attr.attr,
 651        &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 652
 653        &sensor_dev_attr_in0_alarm.dev_attr.attr,
 654        &sensor_dev_attr_in1_alarm.dev_attr.attr,
 655        &sensor_dev_attr_in2_alarm.dev_attr.attr,
 656        &sensor_dev_attr_in3_alarm.dev_attr.attr,
 657        &sensor_dev_attr_in4_alarm.dev_attr.attr,
 658        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 659        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 660        &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 661        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 662        &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 663        &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 664
 665        &dev_attr_cpu0_vid.attr,
 666        &dev_attr_vrm.attr,
 667        &dev_attr_alarms.attr,
 668        &dev_attr_pwm1.attr,
 669        &dev_attr_pwm1_enable.attr,
 670
 671        NULL
 672};
 673
 674static const struct attribute_group asb100_group = {
 675        .attrs = asb100_attributes,
 676};
 677
 678static int asb100_detect_subclients(struct i2c_client *client)
 679{
 680        int i, id, err;
 681        int address = client->addr;
 682        unsigned short sc_addr[2];
 683        struct asb100_data *data = i2c_get_clientdata(client);
 684        struct i2c_adapter *adapter = client->adapter;
 685
 686        id = i2c_adapter_id(adapter);
 687
 688        if (force_subclients[0] == id && force_subclients[1] == address) {
 689                for (i = 2; i <= 3; i++) {
 690                        if (force_subclients[i] < 0x48 ||
 691                            force_subclients[i] > 0x4f) {
 692                                dev_err(&client->dev, "invalid subclient "
 693                                        "address %d; must be 0x48-0x4f\n",
 694                                        force_subclients[i]);
 695                                err = -ENODEV;
 696                                goto ERROR_SC_2;
 697                        }
 698                }
 699                asb100_write_value(client, ASB100_REG_I2C_SUBADDR,
 700                                        (force_subclients[2] & 0x07) |
 701                                        ((force_subclients[3] & 0x07) << 4));
 702                sc_addr[0] = force_subclients[2];
 703                sc_addr[1] = force_subclients[3];
 704        } else {
 705                int val = asb100_read_value(client, ASB100_REG_I2C_SUBADDR);
 706                sc_addr[0] = 0x48 + (val & 0x07);
 707                sc_addr[1] = 0x48 + ((val >> 4) & 0x07);
 708        }
 709
 710        if (sc_addr[0] == sc_addr[1]) {
 711                dev_err(&client->dev, "duplicate addresses 0x%x "
 712                                "for subclients\n", sc_addr[0]);
 713                err = -ENODEV;
 714                goto ERROR_SC_2;
 715        }
 716
 717        data->lm75[0] = i2c_new_dummy(adapter, sc_addr[0]);
 718        if (!data->lm75[0]) {
 719                dev_err(&client->dev, "subclient %d registration "
 720                        "at address 0x%x failed.\n", 1, sc_addr[0]);
 721                err = -ENOMEM;
 722                goto ERROR_SC_2;
 723        }
 724
 725        data->lm75[1] = i2c_new_dummy(adapter, sc_addr[1]);
 726        if (!data->lm75[1]) {
 727                dev_err(&client->dev, "subclient %d registration "
 728                        "at address 0x%x failed.\n", 2, sc_addr[1]);
 729                err = -ENOMEM;
 730                goto ERROR_SC_3;
 731        }
 732
 733        return 0;
 734
 735/* Undo inits in case of errors */
 736ERROR_SC_3:
 737        i2c_unregister_device(data->lm75[0]);
 738ERROR_SC_2:
 739        return err;
 740}
 741
 742/* Return 0 if detection is successful, -ENODEV otherwise */
 743static int asb100_detect(struct i2c_client *client,
 744                         struct i2c_board_info *info)
 745{
 746        struct i2c_adapter *adapter = client->adapter;
 747        int val1, val2;
 748
 749        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 750                pr_debug("detect failed, smbus byte data not supported!\n");
 751                return -ENODEV;
 752        }
 753
 754        val1 = i2c_smbus_read_byte_data(client, ASB100_REG_BANK);
 755        val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
 756
 757        /* If we're in bank 0 */
 758        if ((!(val1 & 0x07)) &&
 759                        /* Check for ASB100 ID (low byte) */
 760                        (((!(val1 & 0x80)) && (val2 != 0x94)) ||
 761                        /* Check for ASB100 ID (high byte ) */
 762                        ((val1 & 0x80) && (val2 != 0x06)))) {
 763                pr_debug("detect failed, bad chip id 0x%02x!\n", val2);
 764                return -ENODEV;
 765        }
 766
 767        /* Put it now into bank 0 and Vendor ID High Byte */
 768        i2c_smbus_write_byte_data(client, ASB100_REG_BANK,
 769                (i2c_smbus_read_byte_data(client, ASB100_REG_BANK) & 0x78)
 770                | 0x80);
 771
 772        /* Determine the chip type. */
 773        val1 = i2c_smbus_read_byte_data(client, ASB100_REG_WCHIPID);
 774        val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
 775
 776        if (val1 != 0x31 || val2 != 0x06)
 777                return -ENODEV;
 778
 779        strlcpy(info->type, "asb100", I2C_NAME_SIZE);
 780
 781        return 0;
 782}
 783
 784static int asb100_probe(struct i2c_client *client,
 785                        const struct i2c_device_id *id)
 786{
 787        int err;
 788        struct asb100_data *data;
 789
 790        data = kzalloc(sizeof(struct asb100_data), GFP_KERNEL);
 791        if (!data) {
 792                pr_debug("probe failed, kzalloc failed!\n");
 793                err = -ENOMEM;
 794                goto ERROR0;
 795        }
 796
 797        i2c_set_clientdata(client, data);
 798        mutex_init(&data->lock);
 799        mutex_init(&data->update_lock);
 800
 801        /* Attach secondary lm75 clients */
 802        err = asb100_detect_subclients(client);
 803        if (err)
 804                goto ERROR1;
 805
 806        /* Initialize the chip */
 807        asb100_init_client(client);
 808
 809        /* A few vars need to be filled upon startup */
 810        data->fan_min[0] = asb100_read_value(client, ASB100_REG_FAN_MIN(0));
 811        data->fan_min[1] = asb100_read_value(client, ASB100_REG_FAN_MIN(1));
 812        data->fan_min[2] = asb100_read_value(client, ASB100_REG_FAN_MIN(2));
 813
 814        /* Register sysfs hooks */
 815        err = sysfs_create_group(&client->dev.kobj, &asb100_group);
 816        if (err)
 817                goto ERROR3;
 818
 819        data->hwmon_dev = hwmon_device_register(&client->dev);
 820        if (IS_ERR(data->hwmon_dev)) {
 821                err = PTR_ERR(data->hwmon_dev);
 822                goto ERROR4;
 823        }
 824
 825        return 0;
 826
 827ERROR4:
 828        sysfs_remove_group(&client->dev.kobj, &asb100_group);
 829ERROR3:
 830        i2c_unregister_device(data->lm75[1]);
 831        i2c_unregister_device(data->lm75[0]);
 832ERROR1:
 833        kfree(data);
 834ERROR0:
 835        return err;
 836}
 837
 838static int asb100_remove(struct i2c_client *client)
 839{
 840        struct asb100_data *data = i2c_get_clientdata(client);
 841
 842        hwmon_device_unregister(data->hwmon_dev);
 843        sysfs_remove_group(&client->dev.kobj, &asb100_group);
 844
 845        i2c_unregister_device(data->lm75[1]);
 846        i2c_unregister_device(data->lm75[0]);
 847
 848        kfree(data);
 849
 850        return 0;
 851}
 852
 853/*
 854 * The SMBus locks itself, usually, but nothing may access the chip between
 855 * bank switches.
 856 */
 857static int asb100_read_value(struct i2c_client *client, u16 reg)
 858{
 859        struct asb100_data *data = i2c_get_clientdata(client);
 860        struct i2c_client *cl;
 861        int res, bank;
 862
 863        mutex_lock(&data->lock);
 864
 865        bank = (reg >> 8) & 0x0f;
 866        if (bank > 2)
 867                /* switch banks */
 868                i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
 869
 870        if (bank == 0 || bank > 2) {
 871                res = i2c_smbus_read_byte_data(client, reg & 0xff);
 872        } else {
 873                /* switch to subclient */
 874                cl = data->lm75[bank - 1];
 875
 876                /* convert from ISA to LM75 I2C addresses */
 877                switch (reg & 0xff) {
 878                case 0x50: /* TEMP */
 879                        res = i2c_smbus_read_word_swapped(cl, 0);
 880                        break;
 881                case 0x52: /* CONFIG */
 882                        res = i2c_smbus_read_byte_data(cl, 1);
 883                        break;
 884                case 0x53: /* HYST */
 885                        res = i2c_smbus_read_word_swapped(cl, 2);
 886                        break;
 887                case 0x55: /* MAX */
 888                default:
 889                        res = i2c_smbus_read_word_swapped(cl, 3);
 890                        break;
 891                }
 892        }
 893
 894        if (bank > 2)
 895                i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
 896
 897        mutex_unlock(&data->lock);
 898
 899        return res;
 900}
 901
 902static void asb100_write_value(struct i2c_client *client, u16 reg, u16 value)
 903{
 904        struct asb100_data *data = i2c_get_clientdata(client);
 905        struct i2c_client *cl;
 906        int bank;
 907
 908        mutex_lock(&data->lock);
 909
 910        bank = (reg >> 8) & 0x0f;
 911        if (bank > 2)
 912                /* switch banks */
 913                i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
 914
 915        if (bank == 0 || bank > 2) {
 916                i2c_smbus_write_byte_data(client, reg & 0xff, value & 0xff);
 917        } else {
 918                /* switch to subclient */
 919                cl = data->lm75[bank - 1];
 920
 921                /* convert from ISA to LM75 I2C addresses */
 922                switch (reg & 0xff) {
 923                case 0x52: /* CONFIG */
 924                        i2c_smbus_write_byte_data(cl, 1, value & 0xff);
 925                        break;
 926                case 0x53: /* HYST */
 927                        i2c_smbus_write_word_swapped(cl, 2, value);
 928                        break;
 929                case 0x55: /* MAX */
 930                        i2c_smbus_write_word_swapped(cl, 3, value);
 931                        break;
 932                }
 933        }
 934
 935        if (bank > 2)
 936                i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
 937
 938        mutex_unlock(&data->lock);
 939}
 940
 941static void asb100_init_client(struct i2c_client *client)
 942{
 943        struct asb100_data *data = i2c_get_clientdata(client);
 944
 945        data->vrm = vid_which_vrm();
 946
 947        /* Start monitoring */
 948        asb100_write_value(client, ASB100_REG_CONFIG,
 949                (asb100_read_value(client, ASB100_REG_CONFIG) & 0xf7) | 0x01);
 950}
 951
 952static struct asb100_data *asb100_update_device(struct device *dev)
 953{
 954        struct i2c_client *client = to_i2c_client(dev);
 955        struct asb100_data *data = i2c_get_clientdata(client);
 956        int i;
 957
 958        mutex_lock(&data->update_lock);
 959
 960        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 961                || !data->valid) {
 962
 963                dev_dbg(&client->dev, "starting device update...\n");
 964
 965                /* 7 voltage inputs */
 966                for (i = 0; i < 7; i++) {
 967                        data->in[i] = asb100_read_value(client,
 968                                ASB100_REG_IN(i));
 969                        data->in_min[i] = asb100_read_value(client,
 970                                ASB100_REG_IN_MIN(i));
 971                        data->in_max[i] = asb100_read_value(client,
 972                                ASB100_REG_IN_MAX(i));
 973                }
 974
 975                /* 3 fan inputs */
 976                for (i = 0; i < 3; i++) {
 977                        data->fan[i] = asb100_read_value(client,
 978                                        ASB100_REG_FAN(i));
 979                        data->fan_min[i] = asb100_read_value(client,
 980                                        ASB100_REG_FAN_MIN(i));
 981                }
 982
 983                /* 4 temperature inputs */
 984                for (i = 1; i <= 4; i++) {
 985                        data->temp[i-1] = asb100_read_value(client,
 986                                        ASB100_REG_TEMP(i));
 987                        data->temp_max[i-1] = asb100_read_value(client,
 988                                        ASB100_REG_TEMP_MAX(i));
 989                        data->temp_hyst[i-1] = asb100_read_value(client,
 990                                        ASB100_REG_TEMP_HYST(i));
 991                }
 992
 993                /* VID and fan divisors */
 994                i = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 995                data->vid = i & 0x0f;
 996                data->vid |= (asb100_read_value(client,
 997                                ASB100_REG_CHIPID) & 0x01) << 4;
 998                data->fan_div[0] = (i >> 4) & 0x03;
 999                data->fan_div[1] = (i >> 6) & 0x03;
1000                data->fan_div[2] = (asb100_read_value(client,
1001                                ASB100_REG_PIN) >> 6) & 0x03;
1002
1003                /* PWM */
1004                data->pwm = asb100_read_value(client, ASB100_REG_PWM1);
1005
1006                /* alarms */
1007                data->alarms = asb100_read_value(client, ASB100_REG_ALARM1) +
1008                        (asb100_read_value(client, ASB100_REG_ALARM2) << 8);
1009
1010                data->last_updated = jiffies;
1011                data->valid = 1;
1012
1013                dev_dbg(&client->dev, "... device update complete\n");
1014        }
1015
1016        mutex_unlock(&data->update_lock);
1017
1018        return data;
1019}
1020
1021module_i2c_driver(asb100_driver);
1022
1023MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1024MODULE_DESCRIPTION("ASB100 Bach driver");
1025MODULE_LICENSE("GPL");
1026
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