drivers/hwmon/asb100.c

   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 #include <linux/module.h>
  40 #include <linux/slab.h>
  41 #include <linux/i2c.h>
  42 #include <linux/i2c-sensor.h>
  43 #include <linux/i2c-vid.h>
  44 #include <linux/init.h>
  45 #include <linux/jiffies.h>
  46 #include "lm75.h"
  47
  48 /*
  49         HISTORY:
  50         2003-12-29      1.0.0   Ported from lm_sensors project for kernel 2.6
  51 */
  52 #define ASB100_VERSION "1.0.0"
  53
  54 /* I2C addresses to scan */
  55 static unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
  56
  57 /* ISA addresses to scan (none) */
  58 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
  59
  60 /* Insmod parameters */
  61 SENSORS_INSMOD_1(asb100);
  62 I2C_CLIENT_MODULE_PARM(force_subclients, "List of subclient addresses: "
  63         "{bus, clientaddr, subclientaddr1, subclientaddr2}");
  64
  65 /* Voltage IN registers 0-6 */
  66 #define ASB100_REG_IN(nr)       (0x20 + (nr))
  67 #define ASB100_REG_IN_MAX(nr)   (0x2b + (nr * 2))
  68 #define ASB100_REG_IN_MIN(nr)   (0x2c + (nr * 2))
  69
  70 /* FAN IN registers 1-3 */
  71 #define ASB100_REG_FAN(nr)      (0x28 + (nr))
  72 #define ASB100_REG_FAN_MIN(nr)  (0x3b + (nr))
  73
  74 /* TEMPERATURE registers 1-4 */
  75 static const u16 asb100_reg_temp[]      = {0, 0x27, 0x150, 0x250, 0x17};
  76 static const u16 asb100_reg_temp_max[]  = {0, 0x39, 0x155, 0x255, 0x18};
  77 static const u16 asb100_reg_temp_hyst[] = {0, 0x3a, 0x153, 0x253, 0x19};
  78
  79 #define ASB100_REG_TEMP(nr) (asb100_reg_temp[nr])
  80 #define ASB100_REG_TEMP_MAX(nr) (asb100_reg_temp_max[nr])
  81 #define ASB100_REG_TEMP_HYST(nr) (asb100_reg_temp_hyst[nr])
  82
  83 #define ASB100_REG_TEMP2_CONFIG 0x0152
  84 #define ASB100_REG_TEMP3_CONFIG 0x0252
  85
  86
  87 #define ASB100_REG_CONFIG       0x40
  88 #define ASB100_REG_ALARM1       0x41
  89 #define ASB100_REG_ALARM2       0x42
  90 #define ASB100_REG_SMIM1        0x43
  91 #define ASB100_REG_SMIM2        0x44
  92 #define ASB100_REG_VID_FANDIV   0x47
  93 #define ASB100_REG_I2C_ADDR     0x48
  94 #define ASB100_REG_CHIPID       0x49
  95 #define ASB100_REG_I2C_SUBADDR  0x4a
  96 #define ASB100_REG_PIN          0x4b
  97 #define ASB100_REG_IRQ          0x4c
  98 #define ASB100_REG_BANK         0x4e
  99 #define ASB100_REG_CHIPMAN      0x4f
 100
 101 #define ASB100_REG_WCHIPID      0x58
 102
 103 /* bit 7 -> enable, bits 0-3 -> duty cycle */
 104 #define ASB100_REG_PWM1         0x59
 105
 106 /* CONVERSIONS
 107    Rounding and limit checking is only done on the TO_REG variants. */
 108
 109 /* These constants are a guess, consistent w/ w83781d */
 110 #define ASB100_IN_MIN (   0)
 111 #define ASB100_IN_MAX (4080)
 112
 113 /* IN: 1/1000 V (0V to 4.08V)
 114    REG: 16mV/bit */
 115 static 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
 121 static unsigned IN_FROM_REG(u8 reg)
 122 {
 123         return reg * 16;
 124 }
 125
 126 static 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
 136 static 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 /* TEMP: 0.001C/bit (-128C to +127C)
 146    REG: 1C/bit, two's complement */
 147 static u8 TEMP_TO_REG(int temp)
 148 {
 149         int ntemp = SENSORS_LIMIT(temp, ASB100_TEMP_MIN, ASB100_TEMP_MAX);
 150         ntemp += (ntemp<0 ? -500 : 500);
 151         return (u8)(ntemp / 1000);
 152 }
 153
 154 static int TEMP_FROM_REG(u8 reg)
 155 {
 156         return (s8)reg * 1000;
 157 }
 158
 159 /* PWM: 0 - 255 per sensors documentation
 160    REG: (6.25% duty cycle per bit) */
 161 static u8 ASB100_PWM_TO_REG(int pwm)
 162 {
 163         pwm = SENSORS_LIMIT(pwm, 0, 255);
 164         return (u8)(pwm / 16);
 165 }
 166
 167 static int ASB100_PWM_FROM_REG(u8 reg)
 168 {
 169         return reg * 16;
 170 }
 171
 172 #define DIV_FROM_REG(val) (1 << (val))
 173
 174 /* FAN DIV: 1, 2, 4, or 8 (defaults to 2)
 175    REG: 0, 1, 2, or 3 (respectively) (defaults to 1) */
 176 static u8 DIV_TO_REG(long val)
 177 {
 178         return val==8 ? 3 : val==4 ? 2 : val==1 ? 0 : 1;
 179 }
 180
 181 /* For each registered client, we need to keep some data in memory. That
 182    data is pointed to by client->data. The structure itself is
 183    dynamically allocated, at the same time the client itself is allocated. */
 184 struct asb100_data {
 185         struct i2c_client client;
 186         struct semaphore lock;
 187         enum chips type;
 188
 189         struct semaphore update_lock;
 190         unsigned long last_updated;     /* In jiffies */
 191
 192         /* array of 2 pointers to subclients */
 193         struct i2c_client *lm75[2];
 194
 195         char valid;             /* !=0 if following fields are valid */
 196         u8 in[7];               /* Register value */
 197         u8 in_max[7];           /* Register value */
 198         u8 in_min[7];           /* Register value */
 199         u8 fan[3];              /* Register value */
 200         u8 fan_min[3];          /* Register value */
 201         u16 temp[4];            /* Register value (0 and 3 are u8 only) */
 202         u16 temp_max[4];        /* Register value (0 and 3 are u8 only) */
 203         u16 temp_hyst[4];       /* Register value (0 and 3 are u8 only) */
 204         u8 fan_div[3];          /* Register encoding, right justified */
 205         u8 pwm;                 /* Register encoding */
 206         u8 vid;                 /* Register encoding, combined */
 207         u32 alarms;             /* Register encoding, combined */
 208         u8 vrm;
 209 };
 210
 211 static int asb100_read_value(struct i2c_client *client, u16 reg);
 212 static void asb100_write_value(struct i2c_client *client, u16 reg, u16 val);
 213
 214 static int asb100_attach_adapter(struct i2c_adapter *adapter);
 215 static int asb100_detect(struct i2c_adapter *adapter, int address, int kind);
 216 static int asb100_detach_client(struct i2c_client *client);
 217 static struct asb100_data *asb100_update_device(struct device *dev);
 218 static void asb100_init_client(struct i2c_client *client);
 219
 220 static struct i2c_driver asb100_driver = {
 221         .owner          = THIS_MODULE,
 222         .name           = "asb100",
 223         .id             = I2C_DRIVERID_ASB100,
 224         .flags          = I2C_DF_NOTIFY,
 225         .attach_adapter = asb100_attach_adapter,
 226         .detach_client  = asb100_detach_client,
 227 };
 228
 229 /* 7 Voltages */
 230 #define show_in_reg(reg) \
 231 static ssize_t show_##reg (struct device *dev, char *buf, int nr) \
 232 { \
 233         struct asb100_data *data = asb100_update_device(dev); \
 234         return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 235 }
 236
 237 show_in_reg(in)
 238 show_in_reg(in_min)
 239 show_in_reg(in_max)
 240
 241 #define set_in_reg(REG, reg) \
 242 static ssize_t set_in_##reg(struct device *dev, const char *buf, \
 243                 size_t count, int nr) \
 244 { \
 245         struct i2c_client *client = to_i2c_client(dev); \
 246         struct asb100_data *data = i2c_get_clientdata(client); \
 247         unsigned long val = simple_strtoul(buf, NULL, 10); \
 248  \
 249         down(&data->update_lock); \
 250         data->in_##reg[nr] = IN_TO_REG(val); \
 251         asb100_write_value(client, ASB100_REG_IN_##REG(nr), \
 252                 data->in_##reg[nr]); \
 253         up(&data->update_lock); \
 254         return count; \
 255 }
 256
 257 set_in_reg(MIN, min)
 258 set_in_reg(MAX, max)
 259
 260 #define sysfs_in(offset) \
 261 static ssize_t \
 262         show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
 263 { \
 264         return show_in(dev, buf, offset); \
 265 } \
 266 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 267                 show_in##offset, NULL); \
 268 static ssize_t \
 269         show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
 270 { \
 271         return show_in_min(dev, buf, offset); \
 272 } \
 273 static ssize_t \
 274         show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
 275 { \
 276         return show_in_max(dev, buf, offset); \
 277 } \
 278 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
 279                 const char *buf, size_t count) \
 280 { \
 281         return set_in_min(dev, buf, count, offset); \
 282 } \
 283 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
 284                 const char *buf, size_t count) \
 285 { \
 286         return set_in_max(dev, buf, count, offset); \
 287 } \
 288 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 289                 show_in##offset##_min, set_in##offset##_min); \
 290 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 291                 show_in##offset##_max, set_in##offset##_max);
 292
 293 sysfs_in(0);
 294 sysfs_in(1);
 295 sysfs_in(2);
 296 sysfs_in(3);
 297 sysfs_in(4);
 298 sysfs_in(5);
 299 sysfs_in(6);
 300
 301 #define device_create_file_in(client, offset) do { \
 302         device_create_file(&client->dev, &dev_attr_in##offset##_input); \
 303         device_create_file(&client->dev, &dev_attr_in##offset##_min); \
 304         device_create_file(&client->dev, &dev_attr_in##offset##_max); \
 305 } while (0)
 306
 307 /* 3 Fans */
 308 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 309 {
 310         struct asb100_data *data = asb100_update_device(dev);
 311         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 312                 DIV_FROM_REG(data->fan_div[nr])));
 313 }
 314
 315 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 316 {
 317         struct asb100_data *data = asb100_update_device(dev);
 318         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 319                 DIV_FROM_REG(data->fan_div[nr])));
 320 }
 321
 322 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 323 {
 324         struct asb100_data *data = asb100_update_device(dev);
 325         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 326 }
 327
 328 static ssize_t set_fan_min(struct device *dev, const char *buf,
 329                                 size_t count, int nr)
 330 {
 331         struct i2c_client *client = to_i2c_client(dev);
 332         struct asb100_data *data = i2c_get_clientdata(client);
 333         u32 val = simple_strtoul(buf, NULL, 10);
 334
 335         down(&data->update_lock);
 336         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 337         asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
 338         up(&data->update_lock);
 339         return count;
 340 }
 341
 342 /* Note: we save and restore the fan minimum here, because its value is
 343    determined in part by the fan divisor.  This follows the principle of
 344    least suprise; the user doesn't expect the fan minimum to change just
 345    because the divisor changed. */
 346 static ssize_t set_fan_div(struct device *dev, const char *buf,
 347                                 size_t count, int nr)
 348 {
 349         struct i2c_client *client = to_i2c_client(dev);
 350         struct asb100_data *data = i2c_get_clientdata(client);
 351         unsigned long min;
 352         unsigned long val = simple_strtoul(buf, NULL, 10);
 353         int reg;
 354
 355         down(&data->update_lock);
 356
 357         min = FAN_FROM_REG(data->fan_min[nr],
 358                         DIV_FROM_REG(data->fan_div[nr]));
 359         data->fan_div[nr] = DIV_TO_REG(val);
 360
 361         switch(nr) {
 362         case 0: /* fan 1 */
 363                 reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 364                 reg = (reg & 0xcf) | (data->fan_div[0] << 4);
 365                 asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
 366                 break;
 367
 368         case 1: /* fan 2 */
 369                 reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 370                 reg = (reg & 0x3f) | (data->fan_div[1] << 6);
 371                 asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
 372                 break;
 373
 374         case 2: /* fan 3 */
 375                 reg = asb100_read_value(client, ASB100_REG_PIN);
 376                 reg = (reg & 0x3f) | (data->fan_div[2] << 6);
 377                 asb100_write_value(client, ASB100_REG_PIN, reg);
 378                 break;
 379         }
 380
 381         data->fan_min[nr] =
 382                 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 383         asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
 384
 385         up(&data->update_lock);
 386
 387         return count;
 388 }
 389
 390 #define sysfs_fan(offset) \
 391 static ssize_t show_fan##offset(struct device *dev, struct device_attribute *attr, char *buf) \
 392 { \
 393         return show_fan(dev, buf, offset - 1); \
 394 } \
 395 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 396 { \
 397         return show_fan_min(dev, buf, offset - 1); \
 398 } \
 399 static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
 400 { \
 401         return show_fan_div(dev, buf, offset - 1); \
 402 } \
 403 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 404                                         size_t count) \
 405 { \
 406         return set_fan_min(dev, buf, count, offset - 1); \
 407 } \
 408 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 409                                         size_t count) \
 410 { \
 411         return set_fan_div(dev, buf, count, offset - 1); \
 412 } \
 413 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 414                 show_fan##offset, NULL); \
 415 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 416                 show_fan##offset##_min, set_fan##offset##_min); \
 417 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 418                 show_fan##offset##_div, set_fan##offset##_div);
 419
 420 sysfs_fan(1);
 421 sysfs_fan(2);
 422 sysfs_fan(3);
 423
 424 #define device_create_file_fan(client, offset) do { \
 425         device_create_file(&client->dev, &dev_attr_fan##offset##_input); \
 426         device_create_file(&client->dev, &dev_attr_fan##offset##_min); \
 427         device_create_file(&client->dev, &dev_attr_fan##offset##_div); \
 428 } while (0)
 429
 430 /* 4 Temp. Sensors */
 431 static int sprintf_temp_from_reg(u16 reg, char *buf, int nr)
 432 {
 433         int ret = 0;
 434
 435         switch (nr) {
 436         case 1: case 2:
 437                 ret = sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(reg));
 438                 break;
 439         case 0: case 3: default:
 440                 ret = sprintf(buf, "%d\n", TEMP_FROM_REG(reg));
 441                 break;
 442         }
 443         return ret;
 444 }
 445
 446 #define show_temp_reg(reg) \
 447 static ssize_t show_##reg(struct device *dev, char *buf, int nr) \
 448 { \
 449         struct asb100_data *data = asb100_update_device(dev); \
 450         return sprintf_temp_from_reg(data->reg[nr], buf, nr); \
 451 }
 452
 453 show_temp_reg(temp);
 454 show_temp_reg(temp_max);
 455 show_temp_reg(temp_hyst);
 456
 457 #define set_temp_reg(REG, reg) \
 458 static ssize_t set_##reg(struct device *dev, const char *buf, \
 459                         size_t count, int nr) \
 460 { \
 461         struct i2c_client *client = to_i2c_client(dev); \
 462         struct asb100_data *data = i2c_get_clientdata(client); \
 463         unsigned long val = simple_strtoul(buf, NULL, 10); \
 464  \
 465         down(&data->update_lock); \
 466         switch (nr) { \
 467         case 1: case 2: \
 468                 data->reg[nr] = LM75_TEMP_TO_REG(val); \
 469                 break; \
 470         case 0: case 3: default: \
 471                 data->reg[nr] = TEMP_TO_REG(val); \
 472                 break; \
 473         } \
 474         asb100_write_value(client, ASB100_REG_TEMP_##REG(nr+1), \
 475                         data->reg[nr]); \
 476         up(&data->update_lock); \
 477         return count; \
 478 }
 479
 480 set_temp_reg(MAX, temp_max);
 481 set_temp_reg(HYST, temp_hyst);
 482
 483 #define sysfs_temp(num) \
 484 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
 485 { \
 486         return show_temp(dev, buf, num-1); \
 487 } \
 488 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL); \
 489 static ssize_t show_temp_max##num(struct device *dev, struct device_attribute *attr, char *buf) \
 490 { \
 491         return show_temp_max(dev, buf, num-1); \
 492 } \
 493 static ssize_t set_temp_max##num(struct device *dev, struct device_attribute *attr, const char *buf, \
 494                                         size_t count) \
 495 { \
 496         return set_temp_max(dev, buf, count, num-1); \
 497 } \
 498 static DEVICE_ATTR(temp##num##_max, S_IRUGO | S_IWUSR, \
 499                 show_temp_max##num, set_temp_max##num); \
 500 static ssize_t show_temp_hyst##num(struct device *dev, struct device_attribute *attr, char *buf) \
 501 { \
 502         return show_temp_hyst(dev, buf, num-1); \
 503 } \
 504 static ssize_t set_temp_hyst##num(struct device *dev, struct device_attribute *attr, const char *buf, \
 505                                         size_t count) \
 506 { \
 507         return set_temp_hyst(dev, buf, count, num-1); \
 508 } \
 509 static DEVICE_ATTR(temp##num##_max_hyst, S_IRUGO | S_IWUSR, \
 510                 show_temp_hyst##num, set_temp_hyst##num);
 511
 512 sysfs_temp(1);
 513 sysfs_temp(2);
 514 sysfs_temp(3);
 515 sysfs_temp(4);
 516
 517 /* VID */
 518 #define device_create_file_temp(client, num) do { \
 519         device_create_file(&client->dev, &dev_attr_temp##num##_input); \
 520         device_create_file(&client->dev, &dev_attr_temp##num##_max); \
 521         device_create_file(&client->dev, &dev_attr_temp##num##_max_hyst); \
 522 } while (0)
 523
 524 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 525 {
 526         struct asb100_data *data = asb100_update_device(dev);
 527         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 528 }
 529
 530 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 531 #define device_create_file_vid(client) \
 532 device_create_file(&client->dev, &dev_attr_cpu0_vid)
 533
 534 /* VRM */
 535 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 536 {
 537         struct asb100_data *data = asb100_update_device(dev);
 538         return sprintf(buf, "%d\n", data->vrm);
 539 }
 540
 541 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 542 {
 543         struct i2c_client *client = to_i2c_client(dev);
 544         struct asb100_data *data = i2c_get_clientdata(client);
 545         unsigned long val = simple_strtoul(buf, NULL, 10);
 546         data->vrm = val;
 547         return count;
 548 }
 549
 550 /* Alarms */
 551 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 552 #define device_create_file_vrm(client) \
 553 device_create_file(&client->dev, &dev_attr_vrm);
 554
 555 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 556 {
 557         struct asb100_data *data = asb100_update_device(dev);
 558         return sprintf(buf, "%u\n", data->alarms);
 559 }
 560
 561 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 562 #define device_create_file_alarms(client) \
 563 device_create_file(&client->dev, &dev_attr_alarms)
 564
 565 /* 1 PWM */
 566 static ssize_t show_pwm1(struct device *dev, struct device_attribute *attr, char *buf)
 567 {
 568         struct asb100_data *data = asb100_update_device(dev);
 569         return sprintf(buf, "%d\n", ASB100_PWM_FROM_REG(data->pwm & 0x0f));
 570 }
 571
 572 static ssize_t set_pwm1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 573 {
 574         struct i2c_client *client = to_i2c_client(dev);
 575         struct asb100_data *data = i2c_get_clientdata(client);
 576         unsigned long val = simple_strtoul(buf, NULL, 10);
 577
 578         down(&data->update_lock);
 579         data->pwm &= 0x80; /* keep the enable bit */
 580         data->pwm |= (0x0f & ASB100_PWM_TO_REG(val));
 581         asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
 582         up(&data->update_lock);
 583         return count;
 584 }
 585
 586 static ssize_t show_pwm_enable1(struct device *dev, struct device_attribute *attr, char *buf)
 587 {
 588         struct asb100_data *data = asb100_update_device(dev);
 589         return sprintf(buf, "%d\n", (data->pwm & 0x80) ? 1 : 0);
 590 }
 591
 592 static ssize_t set_pwm_enable1(struct device *dev, struct device_attribute *attr, const char *buf,
 593                                 size_t count)
 594 {
 595         struct i2c_client *client = to_i2c_client(dev);
 596         struct asb100_data *data = i2c_get_clientdata(client);
 597         unsigned long val = simple_strtoul(buf, NULL, 10);
 598
 599         down(&data->update_lock);
 600         data->pwm &= 0x0f; /* keep the duty cycle bits */
 601         data->pwm |= (val ? 0x80 : 0x00);
 602         asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
 603         up(&data->update_lock);
 604         return count;
 605 }
 606
 607 static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm1, set_pwm1);
 608 static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 609                 show_pwm_enable1, set_pwm_enable1);
 610 #define device_create_file_pwm1(client) do { \
 611         device_create_file(&new_client->dev, &dev_attr_pwm1); \
 612         device_create_file(&new_client->dev, &dev_attr_pwm1_enable); \
 613 } while (0)
 614
 615 /* This function is called when:
 616         asb100_driver is inserted (when this module is loaded), for each
 617                 available adapter
 618         when a new adapter is inserted (and asb100_driver is still present)
 619  */
 620 static int asb100_attach_adapter(struct i2c_adapter *adapter)
 621 {
 622         if (!(adapter->class & I2C_CLASS_HWMON))
 623                 return 0;
 624         return i2c_detect(adapter, &addr_data, asb100_detect);
 625 }
 626
 627 static int asb100_detect_subclients(struct i2c_adapter *adapter, int address,
 628                 int kind, struct i2c_client *new_client)
 629 {
 630         int i, id, err;
 631         struct asb100_data *data = i2c_get_clientdata(new_client);
 632
 633         data->lm75[0] = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 634         if (!(data->lm75[0])) {
 635                 err = -ENOMEM;
 636                 goto ERROR_SC_0;
 637         }
 638         memset(data->lm75[0], 0x00, sizeof(struct i2c_client));
 639
 640         data->lm75[1] = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 641         if (!(data->lm75[1])) {
 642                 err = -ENOMEM;
 643                 goto ERROR_SC_1;
 644         }
 645         memset(data->lm75[1], 0x00, sizeof(struct i2c_client));
 646
 647         id = i2c_adapter_id(adapter);
 648
 649         if (force_subclients[0] == id && force_subclients[1] == address) {
 650                 for (i = 2; i <= 3; i++) {
 651                         if (force_subclients[i] < 0x48 ||
 652                             force_subclients[i] > 0x4f) {
 653                                 dev_err(&new_client->dev, "invalid subclient "
 654                                         "address %d; must be 0x48-0x4f\n",
 655                                         force_subclients[i]);
 656                                 err = -ENODEV;
 657                                 goto ERROR_SC_2;
 658                         }
 659                 }
 660                 asb100_write_value(new_client, ASB100_REG_I2C_SUBADDR,
 661                                         (force_subclients[2] & 0x07) |
 662                                         ((force_subclients[3] & 0x07) <<4));
 663                 data->lm75[0]->addr = force_subclients[2];
 664                 data->lm75[1]->addr = force_subclients[3];
 665         } else {
 666                 int val = asb100_read_value(new_client, ASB100_REG_I2C_SUBADDR);
 667                 data->lm75[0]->addr = 0x48 + (val & 0x07);
 668                 data->lm75[1]->addr = 0x48 + ((val >> 4) & 0x07);
 669         }
 670
 671         if(data->lm75[0]->addr == data->lm75[1]->addr) {
 672                 dev_err(&new_client->dev, "duplicate addresses 0x%x "
 673                                 "for subclients\n", data->lm75[0]->addr);
 674                 err = -ENODEV;
 675                 goto ERROR_SC_2;
 676         }
 677
 678         for (i = 0; i <= 1; i++) {
 679                 i2c_set_clientdata(data->lm75[i], NULL);
 680                 data->lm75[i]->adapter = adapter;
 681                 data->lm75[i]->driver = &asb100_driver;
 682                 data->lm75[i]->flags = 0;
 683                 strlcpy(data->lm75[i]->name, "asb100 subclient", I2C_NAME_SIZE);
 684         }
 685
 686         if ((err = i2c_attach_client(data->lm75[0]))) {
 687                 dev_err(&new_client->dev, "subclient %d registration "
 688                         "at address 0x%x failed.\n", i, data->lm75[0]->addr);
 689                 goto ERROR_SC_2;
 690         }
 691
 692         if ((err = i2c_attach_client(data->lm75[1]))) {
 693                 dev_err(&new_client->dev, "subclient %d registration "
 694                         "at address 0x%x failed.\n", i, data->lm75[1]->addr);
 695                 goto ERROR_SC_3;
 696         }
 697
 698         return 0;
 699
 700 /* Undo inits in case of errors */
 701 ERROR_SC_3:
 702         i2c_detach_client(data->lm75[0]);
 703 ERROR_SC_2:
 704         kfree(data->lm75[1]);
 705 ERROR_SC_1:
 706         kfree(data->lm75[0]);
 707 ERROR_SC_0:
 708         return err;
 709 }
 710
 711 static int asb100_detect(struct i2c_adapter *adapter, int address, int kind)
 712 {
 713         int err;
 714         struct i2c_client *new_client;
 715         struct asb100_data *data;
 716
 717         /* asb100 is SMBus only */
 718         if (i2c_is_isa_adapter(adapter)) {
 719                 pr_debug("asb100.o: detect failed, "
 720                                 "cannot attach to legacy adapter!\n");
 721                 err = -ENODEV;
 722                 goto ERROR0;
 723         }
 724
 725         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 726                 pr_debug("asb100.o: detect failed, "
 727                                 "smbus byte data not supported!\n");
 728                 err = -ENODEV;
 729                 goto ERROR0;
 730         }
 731
 732         /* OK. For now, we presume we have a valid client. We now create the
 733            client structure, even though we cannot fill it completely yet.
 734            But it allows us to access asb100_{read,write}_value. */
 735
 736         if (!(data = kmalloc(sizeof(struct asb100_data), GFP_KERNEL))) {
 737                 pr_debug("asb100.o: detect failed, kmalloc failed!\n");
 738                 err = -ENOMEM;
 739                 goto ERROR0;
 740         }
 741         memset(data, 0, sizeof(struct asb100_data));
 742
 743         new_client = &data->client;
 744         init_MUTEX(&data->lock);
 745         i2c_set_clientdata(new_client, data);
 746         new_client->addr = address;
 747         new_client->adapter = adapter;
 748         new_client->driver = &asb100_driver;
 749         new_client->flags = 0;
 750
 751         /* Now, we do the remaining detection. */
 752
 753         /* The chip may be stuck in some other bank than bank 0. This may
 754            make reading other information impossible. Specify a force=... or
 755            force_*=... parameter, and the chip will be reset to the right
 756            bank. */
 757         if (kind < 0) {
 758
 759                 int val1 = asb100_read_value(new_client, ASB100_REG_BANK);
 760                 int val2 = asb100_read_value(new_client, ASB100_REG_CHIPMAN);
 761
 762                 /* If we're in bank 0 */
 763                 if ( (!(val1 & 0x07)) &&
 764                                 /* Check for ASB100 ID (low byte) */
 765                                 ( ((!(val1 & 0x80)) && (val2 != 0x94)) ||
 766                                 /* Check for ASB100 ID (high byte ) */
 767                                 ((val1 & 0x80) && (val2 != 0x06)) ) ) {
 768                         pr_debug("asb100.o: detect failed, "
 769                                         "bad chip id 0x%02x!\n", val2);
 770                         err = -ENODEV;
 771                         goto ERROR1;
 772                 }
 773
 774         } /* kind < 0 */
 775
 776         /* We have either had a force parameter, or we have already detected
 777            Winbond. Put it now into bank 0 and Vendor ID High Byte */
 778         asb100_write_value(new_client, ASB100_REG_BANK,
 779                 (asb100_read_value(new_client, ASB100_REG_BANK) & 0x78) | 0x80);
 780
 781         /* Determine the chip type. */
 782         if (kind <= 0) {
 783                 int val1 = asb100_read_value(new_client, ASB100_REG_WCHIPID);
 784                 int val2 = asb100_read_value(new_client, ASB100_REG_CHIPMAN);
 785
 786                 if ((val1 == 0x31) && (val2 == 0x06))
 787                         kind = asb100;
 788                 else {
 789                         if (kind == 0)
 790                                 dev_warn(&new_client->dev, "ignoring "
 791                                         "'force' parameter for unknown chip "
 792                                         "at adapter %d, address 0x%02x.\n",
 793                                         i2c_adapter_id(adapter), address);
 794                         err = -ENODEV;
 795                         goto ERROR1;
 796                 }
 797         }
 798
 799         /* Fill in remaining client fields and put it into the global list */
 800         strlcpy(new_client->name, "asb100", I2C_NAME_SIZE);
 801         data->type = kind;
 802
 803         data->valid = 0;
 804         init_MUTEX(&data->update_lock);
 805
 806         /* Tell the I2C layer a new client has arrived */
 807         if ((err = i2c_attach_client(new_client)))
 808                 goto ERROR1;
 809
 810         /* Attach secondary lm75 clients */
 811         if ((err = asb100_detect_subclients(adapter, address, kind,
 812                         new_client)))
 813                 goto ERROR2;
 814
 815         /* Initialize the chip */
 816         asb100_init_client(new_client);
 817
 818         /* A few vars need to be filled upon startup */
 819         data->fan_min[0] = asb100_read_value(new_client, ASB100_REG_FAN_MIN(0));
 820         data->fan_min[1] = asb100_read_value(new_client, ASB100_REG_FAN_MIN(1));
 821         data->fan_min[2] = asb100_read_value(new_client, ASB100_REG_FAN_MIN(2));
 822
 823         /* Register sysfs hooks */
 824         device_create_file_in(new_client, 0);
 825         device_create_file_in(new_client, 1);
 826         device_create_file_in(new_client, 2);
 827         device_create_file_in(new_client, 3);
 828         device_create_file_in(new_client, 4);
 829         device_create_file_in(new_client, 5);
 830         device_create_file_in(new_client, 6);
 831
 832         device_create_file_fan(new_client, 1);
 833         device_create_file_fan(new_client, 2);
 834         device_create_file_fan(new_client, 3);
 835
 836         device_create_file_temp(new_client, 1);
 837         device_create_file_temp(new_client, 2);
 838         device_create_file_temp(new_client, 3);
 839         device_create_file_temp(new_client, 4);
 840
 841         device_create_file_vid(new_client);
 842         device_create_file_vrm(new_client);
 843
 844         device_create_file_alarms(new_client);
 845
 846         device_create_file_pwm1(new_client);
 847
 848         return 0;
 849
 850 ERROR2:
 851         i2c_detach_client(new_client);
 852 ERROR1:
 853         kfree(data);
 854 ERROR0:
 855         return err;
 856 }
 857
 858 static int asb100_detach_client(struct i2c_client *client)
 859 {
 860         int err;
 861
 862         if ((err = i2c_detach_client(client))) {
 863                 dev_err(&client->dev, "client deregistration failed; "
 864                         "client not detached.\n");
 865                 return err;
 866         }
 867
 868         if (i2c_get_clientdata(client)==NULL) {
 869                 /* subclients */
 870                 kfree(client);
 871         } else {
 872                 /* main client */
 873                 kfree(i2c_get_clientdata(client));
 874         }
 875
 876         return 0;
 877 }
 878
 879 /* The SMBus locks itself, usually, but nothing may access the chip between
 880    bank switches. */
 881 static int asb100_read_value(struct i2c_client *client, u16 reg)
 882 {
 883         struct asb100_data *data = i2c_get_clientdata(client);
 884         struct i2c_client *cl;
 885         int res, bank;
 886
 887         down(&data->lock);
 888
 889         bank = (reg >> 8) & 0x0f;
 890         if (bank > 2)
 891                 /* switch banks */
 892                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
 893
 894         if (bank == 0 || bank > 2) {
 895                 res = i2c_smbus_read_byte_data(client, reg & 0xff);
 896         } else {
 897                 /* switch to subclient */
 898                 cl = data->lm75[bank - 1];
 899
 900                 /* convert from ISA to LM75 I2C addresses */
 901                 switch (reg & 0xff) {
 902                 case 0x50: /* TEMP */
 903                         res = swab16(i2c_smbus_read_word_data (cl, 0));
 904                         break;
 905                 case 0x52: /* CONFIG */
 906                         res = i2c_smbus_read_byte_data(cl, 1);
 907                         break;
 908                 case 0x53: /* HYST */
 909                         res = swab16(i2c_smbus_read_word_data (cl, 2));
 910                         break;
 911                 case 0x55: /* MAX */
 912                 default:
 913                         res = swab16(i2c_smbus_read_word_data (cl, 3));
 914                         break;
 915                 }
 916         }
 917
 918         if (bank > 2)
 919                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
 920
 921         up(&data->lock);
 922
 923         return res;
 924 }
 925
 926 static void asb100_write_value(struct i2c_client *client, u16 reg, u16 value)
 927 {
 928         struct asb100_data *data = i2c_get_clientdata(client);
 929         struct i2c_client *cl;
 930         int bank;
 931
 932         down(&data->lock);
 933
 934         bank = (reg >> 8) & 0x0f;
 935         if (bank > 2)
 936                 /* switch banks */
 937                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
 938
 939         if (bank == 0 || bank > 2) {
 940                 i2c_smbus_write_byte_data(client, reg & 0xff, value & 0xff);
 941         } else {
 942                 /* switch to subclient */
 943                 cl = data->lm75[bank - 1];
 944
 945                 /* convert from ISA to LM75 I2C addresses */
 946                 switch (reg & 0xff) {
 947                 case 0x52: /* CONFIG */
 948                         i2c_smbus_write_byte_data(cl, 1, value & 0xff);
 949                         break;
 950                 case 0x53: /* HYST */
 951                         i2c_smbus_write_word_data(cl, 2, swab16(value));
 952                         break;
 953                 case 0x55: /* MAX */
 954                         i2c_smbus_write_word_data(cl, 3, swab16(value));
 955                         break;
 956                 }
 957         }
 958
 959         if (bank > 2)
 960                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
 961
 962         up(&data->lock);
 963 }
 964
 965 static void asb100_init_client(struct i2c_client *client)
 966 {
 967         struct asb100_data *data = i2c_get_clientdata(client);
 968         int vid = 0;
 969
 970         vid = asb100_read_value(client, ASB100_REG_VID_FANDIV) & 0x0f;
 971         vid |= (asb100_read_value(client, ASB100_REG_CHIPID) & 0x01) << 4;
 972         data->vrm = i2c_which_vrm();
 973         vid = vid_from_reg(vid, data->vrm);
 974
 975         /* Start monitoring */
 976         asb100_write_value(client, ASB100_REG_CONFIG,
 977                 (asb100_read_value(client, ASB100_REG_CONFIG) & 0xf7) | 0x01);
 978 }
 979
 980 static struct asb100_data *asb100_update_device(struct device *dev)
 981 {
 982         struct i2c_client *client = to_i2c_client(dev);
 983         struct asb100_data *data = i2c_get_clientdata(client);
 984         int i;
 985
 986         down(&data->update_lock);
 987
 988         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 989                 || !data->valid) {
 990
 991                 dev_dbg(&client->dev, "starting device update...\n");
 992
 993                 /* 7 voltage inputs */
 994                 for (i = 0; i < 7; i++) {
 995                         data->in[i] = asb100_read_value(client,
 996                                 ASB100_REG_IN(i));
 997                         data->in_min[i] = asb100_read_value(client,
 998                                 ASB100_REG_IN_MIN(i));
 999                         data->in_max[i] = asb100_read_value(client,
1000                                 ASB100_REG_IN_MAX(i));
1001                 }
1002
1003                 /* 3 fan inputs */
1004                 for (i = 0; i < 3; i++) {
1005                         data->fan[i] = asb100_read_value(client,
1006                                         ASB100_REG_FAN(i));
1007                         data->fan_min[i] = asb100_read_value(client,
1008                                         ASB100_REG_FAN_MIN(i));
1009                 }
1010
1011                 /* 4 temperature inputs */
1012                 for (i = 1; i <= 4; i++) {
1013                         data->temp[i-1] = asb100_read_value(client,
1014                                         ASB100_REG_TEMP(i));
1015                         data->temp_max[i-1] = asb100_read_value(client,
1016                                         ASB100_REG_TEMP_MAX(i));
1017                         data->temp_hyst[i-1] = asb100_read_value(client,
1018                                         ASB100_REG_TEMP_HYST(i));
1019                 }
1020
1021                 /* VID and fan divisors */
1022                 i = asb100_read_value(client, ASB100_REG_VID_FANDIV);
1023                 data->vid = i & 0x0f;
1024                 data->vid |= (asb100_read_value(client,
1025                                 ASB100_REG_CHIPID) & 0x01) << 4;
1026                 data->fan_div[0] = (i >> 4) & 0x03;
1027                 data->fan_div[1] = (i >> 6) & 0x03;
1028                 data->fan_div[2] = (asb100_read_value(client,
1029                                 ASB100_REG_PIN) >> 6) & 0x03;
1030
1031                 /* PWM */
1032                 data->pwm = asb100_read_value(client, ASB100_REG_PWM1);
1033
1034                 /* alarms */
1035                 data->alarms = asb100_read_value(client, ASB100_REG_ALARM1) +
1036                         (asb100_read_value(client, ASB100_REG_ALARM2) << 8);
1037
1038                 data->last_updated = jiffies;
1039                 data->valid = 1;
1040
1041                 dev_dbg(&client->dev, "... device update complete\n");
1042         }
1043
1044         up(&data->update_lock);
1045
1046         return data;
1047 }
1048
1049 static int __init asb100_init(void)
1050 {
1051         return i2c_add_driver(&asb100_driver);
1052 }
1053
1054 static void __exit asb100_exit(void)
1055 {
1056         i2c_del_driver(&asb100_driver);
1057 }
1058
1059 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1060 MODULE_DESCRIPTION("ASB100 Bach driver");
1061 MODULE_LICENSE("GPL");
1062
1063 module_init(asb100_init);
1064 module_exit(asb100_exit);
1065