drivers/hwmon/gl520sm.c

   1 /*
   2     gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
   3                 monitoring
   4     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
   5                               Kyösti Mälkki <kmalkki@cc.hut.fi>
   6     Copyright (c) 2005        Maarten Deprez <maartendeprez@users.sourceforge.net>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/i2c.h>
  29 #include <linux/hwmon.h>
  30 #include <linux/hwmon-vid.h>
  31 #include <linux/err.h>
  32 #include <linux/mutex.h>
  33
  34 /* Type of the extra sensor */
  35 static unsigned short extra_sensor_type;
  36 module_param(extra_sensor_type, ushort, 0);
  37 MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");
  38
  39 /* Addresses to scan */
  40 static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  41
  42 /* Insmod parameters */
  43 I2C_CLIENT_INSMOD_1(gl520sm);
  44
  45 /* Many GL520 constants specified below
  46 One of the inputs can be configured as either temp or voltage.
  47 That's why _TEMP2 and _IN4 access the same register
  48 */
  49
  50 /* The GL520 registers */
  51 #define GL520_REG_CHIP_ID               0x00
  52 #define GL520_REG_REVISION              0x01
  53 #define GL520_REG_CONF                  0x03
  54 #define GL520_REG_MASK                  0x11
  55
  56 #define GL520_REG_VID_INPUT             0x02
  57
  58 #define GL520_REG_IN0_INPUT             0x15
  59 #define GL520_REG_IN0_LIMIT             0x0c
  60 #define GL520_REG_IN0_MIN               GL520_REG_IN0_LIMIT
  61 #define GL520_REG_IN0_MAX               GL520_REG_IN0_LIMIT
  62
  63 #define GL520_REG_IN1_INPUT             0x14
  64 #define GL520_REG_IN1_LIMIT             0x09
  65 #define GL520_REG_IN1_MIN               GL520_REG_IN1_LIMIT
  66 #define GL520_REG_IN1_MAX               GL520_REG_IN1_LIMIT
  67
  68 #define GL520_REG_IN2_INPUT             0x13
  69 #define GL520_REG_IN2_LIMIT             0x0a
  70 #define GL520_REG_IN2_MIN               GL520_REG_IN2_LIMIT
  71 #define GL520_REG_IN2_MAX               GL520_REG_IN2_LIMIT
  72
  73 #define GL520_REG_IN3_INPUT             0x0d
  74 #define GL520_REG_IN3_LIMIT             0x0b
  75 #define GL520_REG_IN3_MIN               GL520_REG_IN3_LIMIT
  76 #define GL520_REG_IN3_MAX               GL520_REG_IN3_LIMIT
  77
  78 #define GL520_REG_IN4_INPUT             0x0e
  79 #define GL520_REG_IN4_MAX               0x17
  80 #define GL520_REG_IN4_MIN               0x18
  81
  82 #define GL520_REG_TEMP1_INPUT           0x04
  83 #define GL520_REG_TEMP1_MAX             0x05
  84 #define GL520_REG_TEMP1_MAX_HYST        0x06
  85
  86 #define GL520_REG_TEMP2_INPUT           0x0e
  87 #define GL520_REG_TEMP2_MAX             0x17
  88 #define GL520_REG_TEMP2_MAX_HYST        0x18
  89
  90 #define GL520_REG_FAN_INPUT             0x07
  91 #define GL520_REG_FAN_MIN               0x08
  92 #define GL520_REG_FAN_DIV               0x0f
  93 #define GL520_REG_FAN_OFF               GL520_REG_FAN_DIV
  94
  95 #define GL520_REG_ALARMS                0x12
  96 #define GL520_REG_BEEP_MASK             0x10
  97 #define GL520_REG_BEEP_ENABLE           GL520_REG_CONF
  98
  99 /*
 100  * Function declarations
 101  */
 102
 103 static int gl520_attach_adapter(struct i2c_adapter *adapter);
 104 static int gl520_detect(struct i2c_adapter *adapter, int address, int kind);
 105 static void gl520_init_client(struct i2c_client *client);
 106 static int gl520_detach_client(struct i2c_client *client);
 107 static int gl520_read_value(struct i2c_client *client, u8 reg);
 108 static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value);
 109 static struct gl520_data *gl520_update_device(struct device *dev);
 110
 111 /* Driver data */
 112 static struct i2c_driver gl520_driver = {
 113         .driver = {
 114                 .name   = "gl520sm",
 115         },
 116         .id             = I2C_DRIVERID_GL520,
 117         .attach_adapter = gl520_attach_adapter,
 118         .detach_client  = gl520_detach_client,
 119 };
 120
 121 /* Client data */
 122 struct gl520_data {
 123         struct i2c_client client;
 124         struct class_device *class_dev;
 125         struct mutex update_lock;
 126         char valid;             /* zero until the following fields are valid */
 127         unsigned long last_updated;     /* in jiffies */
 128
 129         u8 vid;
 130         u8 vrm;
 131         u8 in_input[5];         /* [0] = VVD */
 132         u8 in_min[5];           /* [0] = VDD */
 133         u8 in_max[5];           /* [0] = VDD */
 134         u8 fan_input[2];
 135         u8 fan_min[2];
 136         u8 fan_div[2];
 137         u8 fan_off;
 138         u8 temp_input[2];
 139         u8 temp_max[2];
 140         u8 temp_max_hyst[2];
 141         u8 alarms;
 142         u8 beep_enable;
 143         u8 beep_mask;
 144         u8 alarm_mask;
 145         u8 two_temps;
 146 };
 147
 148 /*
 149  * Sysfs stuff
 150  */
 151
 152 #define sysfs_r(type, n, item, reg) \
 153 static ssize_t get_##type##item (struct gl520_data *, char *, int); \
 154 static ssize_t get_##type##n##item (struct device *, struct device_attribute *attr, char *); \
 155 static ssize_t get_##type##n##item (struct device *dev, struct device_attribute *attr, char *buf) \
 156 { \
 157         struct gl520_data *data = gl520_update_device(dev); \
 158         return get_##type##item(data, buf, (n)); \
 159 }
 160
 161 #define sysfs_w(type, n, item, reg) \
 162 static ssize_t set_##type##item (struct i2c_client *, struct gl520_data *, const char *, size_t, int, int); \
 163 static ssize_t set_##type##n##item (struct device *, struct device_attribute *attr, const char *, size_t); \
 164 static ssize_t set_##type##n##item (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
 165 { \
 166         struct i2c_client *client = to_i2c_client(dev); \
 167         struct gl520_data *data = i2c_get_clientdata(client); \
 168         return set_##type##item(client, data, buf, count, (n), reg); \
 169 }
 170
 171 #define sysfs_rw_n(type, n, item, reg) \
 172 sysfs_r(type, n, item, reg) \
 173 sysfs_w(type, n, item, reg) \
 174 static DEVICE_ATTR(type##n##item, S_IRUGO | S_IWUSR, get_##type##n##item, set_##type##n##item);
 175
 176 #define sysfs_ro_n(type, n, item, reg) \
 177 sysfs_r(type, n, item, reg) \
 178 static DEVICE_ATTR(type##n##item, S_IRUGO, get_##type##n##item, NULL);
 179
 180 #define sysfs_rw(type, item, reg) \
 181 sysfs_r(type, 0, item, reg) \
 182 sysfs_w(type, 0, item, reg) \
 183 static DEVICE_ATTR(type##item, S_IRUGO | S_IWUSR, get_##type##0##item, set_##type##0##item);
 184
 185 #define sysfs_ro(type, item, reg) \
 186 sysfs_r(type, 0, item, reg) \
 187 static DEVICE_ATTR(type##item, S_IRUGO, get_##type##0##item, NULL);
 188
 189
 190 #define sysfs_vid(n) \
 191 sysfs_ro_n(cpu, n, _vid, GL520_REG_VID_INPUT)
 192
 193 #define device_create_file_vid(client, n) \
 194 device_create_file(&client->dev, &dev_attr_cpu##n##_vid)
 195
 196 #define sysfs_in(n) \
 197 sysfs_ro_n(in, n, _input, GL520_REG_IN##n##INPUT) \
 198 sysfs_rw_n(in, n, _min, GL520_REG_IN##n##_MIN) \
 199 sysfs_rw_n(in, n, _max, GL520_REG_IN##n##_MAX) \
 200
 201 #define device_create_file_in(client, n) \
 202 ({device_create_file(&client->dev, &dev_attr_in##n##_input); \
 203 device_create_file(&client->dev, &dev_attr_in##n##_min); \
 204 device_create_file(&client->dev, &dev_attr_in##n##_max);})
 205
 206 #define sysfs_fan(n) \
 207 sysfs_ro_n(fan, n, _input, GL520_REG_FAN_INPUT) \
 208 sysfs_rw_n(fan, n, _min, GL520_REG_FAN_MIN) \
 209 sysfs_rw_n(fan, n, _div, GL520_REG_FAN_DIV)
 210
 211 #define device_create_file_fan(client, n) \
 212 ({device_create_file(&client->dev, &dev_attr_fan##n##_input); \
 213 device_create_file(&client->dev, &dev_attr_fan##n##_min); \
 214 device_create_file(&client->dev, &dev_attr_fan##n##_div);})
 215
 216 #define sysfs_fan_off(n) \
 217 sysfs_rw_n(fan, n, _off, GL520_REG_FAN_OFF) \
 218
 219 #define device_create_file_fan_off(client, n) \
 220 device_create_file(&client->dev, &dev_attr_fan##n##_off)
 221
 222 #define sysfs_temp(n) \
 223 sysfs_ro_n(temp, n, _input, GL520_REG_TEMP##n##_INPUT) \
 224 sysfs_rw_n(temp, n, _max, GL520_REG_TEMP##n##_MAX) \
 225 sysfs_rw_n(temp, n, _max_hyst, GL520_REG_TEMP##n##_MAX_HYST)
 226
 227 #define device_create_file_temp(client, n) \
 228 ({device_create_file(&client->dev, &dev_attr_temp##n##_input); \
 229 device_create_file(&client->dev, &dev_attr_temp##n##_max); \
 230 device_create_file(&client->dev, &dev_attr_temp##n##_max_hyst);})
 231
 232 #define sysfs_alarms() \
 233 sysfs_ro(alarms, , GL520_REG_ALARMS) \
 234 sysfs_rw(beep_enable, , GL520_REG_BEEP_ENABLE) \
 235 sysfs_rw(beep_mask, , GL520_REG_BEEP_MASK)
 236
 237 #define device_create_file_alarms(client) \
 238 ({device_create_file(&client->dev, &dev_attr_alarms); \
 239 device_create_file(&client->dev, &dev_attr_beep_enable); \
 240 device_create_file(&client->dev, &dev_attr_beep_mask);})
 241
 242
 243 sysfs_vid(0)
 244
 245 sysfs_in(0)
 246 sysfs_in(1)
 247 sysfs_in(2)
 248 sysfs_in(3)
 249 sysfs_in(4)
 250
 251 sysfs_fan(1)
 252 sysfs_fan(2)
 253 sysfs_fan_off(1)
 254
 255 sysfs_temp(1)
 256 sysfs_temp(2)
 257
 258 sysfs_alarms()
 259
 260
 261 static ssize_t get_cpu_vid(struct gl520_data *data, char *buf, int n)
 262 {
 263         return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 264 }
 265
 266 #define VDD_FROM_REG(val) (((val)*95+2)/4)
 267 #define VDD_TO_REG(val) (SENSORS_LIMIT((((val)*4+47)/95),0,255))
 268
 269 #define IN_FROM_REG(val) ((val)*19)
 270 #define IN_TO_REG(val) (SENSORS_LIMIT((((val)+9)/19),0,255))
 271
 272 static ssize_t get_in_input(struct gl520_data *data, char *buf, int n)
 273 {
 274         u8 r = data->in_input[n];
 275
 276         if (n == 0)
 277                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 278         else
 279                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 280 }
 281
 282 static ssize_t get_in_min(struct gl520_data *data, char *buf, int n)
 283 {
 284         u8 r = data->in_min[n];
 285
 286         if (n == 0)
 287                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 288         else
 289                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 290 }
 291
 292 static ssize_t get_in_max(struct gl520_data *data, char *buf, int n)
 293 {
 294         u8 r = data->in_max[n];
 295
 296         if (n == 0)
 297                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 298         else
 299                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 300 }
 301
 302 static ssize_t set_in_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 303 {
 304         long v = simple_strtol(buf, NULL, 10);
 305         u8 r;
 306
 307         mutex_lock(&data->update_lock);
 308
 309         if (n == 0)
 310                 r = VDD_TO_REG(v);
 311         else
 312                 r = IN_TO_REG(v);
 313
 314         data->in_min[n] = r;
 315
 316         if (n < 4)
 317                 gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);
 318         else
 319                 gl520_write_value(client, reg, r);
 320
 321         mutex_unlock(&data->update_lock);
 322         return count;
 323 }
 324
 325 static ssize_t set_in_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 326 {
 327         long v = simple_strtol(buf, NULL, 10);
 328         u8 r;
 329
 330         if (n == 0)
 331                 r = VDD_TO_REG(v);
 332         else
 333                 r = IN_TO_REG(v);
 334
 335         mutex_lock(&data->update_lock);
 336
 337         data->in_max[n] = r;
 338
 339         if (n < 4)
 340                 gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
 341         else
 342                 gl520_write_value(client, reg, r);
 343
 344         mutex_unlock(&data->update_lock);
 345         return count;
 346 }
 347
 348 #define DIV_FROM_REG(val) (1 << (val))
 349 #define FAN_FROM_REG(val,div) ((val)==0 ? 0 : (480000/((val) << (div))))
 350 #define FAN_TO_REG(val,div) ((val)<=0?0:SENSORS_LIMIT((480000 + ((val) << ((div)-1))) / ((val) << (div)), 1, 255));
 351
 352 static ssize_t get_fan_input(struct gl520_data *data, char *buf, int n)
 353 {
 354         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n - 1], data->fan_div[n - 1]));
 355 }
 356
 357 static ssize_t get_fan_min(struct gl520_data *data, char *buf, int n)
 358 {
 359         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n - 1], data->fan_div[n - 1]));
 360 }
 361
 362 static ssize_t get_fan_div(struct gl520_data *data, char *buf, int n)
 363 {
 364         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n - 1]));
 365 }
 366
 367 static ssize_t get_fan_off(struct gl520_data *data, char *buf, int n)
 368 {
 369         return sprintf(buf, "%d\n", data->fan_off);
 370 }
 371
 372 static ssize_t set_fan_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 373 {
 374         unsigned long v = simple_strtoul(buf, NULL, 10);
 375         u8 r;
 376
 377         mutex_lock(&data->update_lock);
 378         r = FAN_TO_REG(v, data->fan_div[n - 1]);
 379         data->fan_min[n - 1] = r;
 380
 381         if (n == 1)
 382                 gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
 383         else
 384                 gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);
 385
 386         data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 387         if (data->fan_min[n - 1] == 0)
 388                 data->alarm_mask &= (n == 1) ? ~0x20 : ~0x40;
 389         else
 390                 data->alarm_mask |= (n == 1) ? 0x20 : 0x40;
 391         data->beep_mask &= data->alarm_mask;
 392         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 393
 394         mutex_unlock(&data->update_lock);
 395         return count;
 396 }
 397
 398 static ssize_t set_fan_div(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 399 {
 400         unsigned long v = simple_strtoul(buf, NULL, 10);
 401         u8 r;
 402
 403         switch (v) {
 404         case 1: r = 0; break;
 405         case 2: r = 1; break;
 406         case 4: r = 2; break;
 407         case 8: r = 3; break;
 408         default:
 409                 dev_err(&client->dev, "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
 410                 return -EINVAL;
 411         }
 412
 413         mutex_lock(&data->update_lock);
 414         data->fan_div[n - 1] = r;
 415
 416         if (n == 1)
 417                 gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xc0) | (r << 6));
 418         else
 419                 gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x30) | (r << 4));
 420
 421         mutex_unlock(&data->update_lock);
 422         return count;
 423 }
 424
 425 static ssize_t set_fan_off(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 426 {
 427         u8 r = simple_strtoul(buf, NULL, 10)?1:0;
 428
 429         mutex_lock(&data->update_lock);
 430         data->fan_off = r;
 431         gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));
 432         mutex_unlock(&data->update_lock);
 433         return count;
 434 }
 435
 436 #define TEMP_FROM_REG(val) (((val) - 130) * 1000)
 437 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((((val)<0?(val)-500:(val)+500) / 1000)+130),0,255))
 438
 439 static ssize_t get_temp_input(struct gl520_data *data, char *buf, int n)
 440 {
 441         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n - 1]));
 442 }
 443
 444 static ssize_t get_temp_max(struct gl520_data *data, char *buf, int n)
 445 {
 446         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n - 1]));
 447 }
 448
 449 static ssize_t get_temp_max_hyst(struct gl520_data *data, char *buf, int n)
 450 {
 451         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n - 1]));
 452 }
 453
 454 static ssize_t set_temp_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 455 {
 456         long v = simple_strtol(buf, NULL, 10);
 457
 458         mutex_lock(&data->update_lock);
 459         data->temp_max[n - 1] = TEMP_TO_REG(v);
 460         gl520_write_value(client, reg, data->temp_max[n - 1]);
 461         mutex_unlock(&data->update_lock);
 462         return count;
 463 }
 464
 465 static ssize_t set_temp_max_hyst(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 466 {
 467         long v = simple_strtol(buf, NULL, 10);
 468
 469         mutex_lock(&data->update_lock);
 470         data->temp_max_hyst[n - 1] = TEMP_TO_REG(v);
 471         gl520_write_value(client, reg, data->temp_max_hyst[n - 1]);
 472         mutex_unlock(&data->update_lock);
 473         return count;
 474 }
 475
 476 static ssize_t get_alarms(struct gl520_data *data, char *buf, int n)
 477 {
 478         return sprintf(buf, "%d\n", data->alarms);
 479 }
 480
 481 static ssize_t get_beep_enable(struct gl520_data *data, char *buf, int n)
 482 {
 483         return sprintf(buf, "%d\n", data->beep_enable);
 484 }
 485
 486 static ssize_t get_beep_mask(struct gl520_data *data, char *buf, int n)
 487 {
 488         return sprintf(buf, "%d\n", data->beep_mask);
 489 }
 490
 491 static ssize_t set_beep_enable(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 492 {
 493         u8 r = simple_strtoul(buf, NULL, 10)?0:1;
 494
 495         mutex_lock(&data->update_lock);
 496         data->beep_enable = !r;
 497         gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x04) | (r << 2));
 498         mutex_unlock(&data->update_lock);
 499         return count;
 500 }
 501
 502 static ssize_t set_beep_mask(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
 503 {
 504         u8 r = simple_strtoul(buf, NULL, 10);
 505
 506         mutex_lock(&data->update_lock);
 507         r &= data->alarm_mask;
 508         data->beep_mask = r;
 509         gl520_write_value(client, reg, r);
 510         mutex_unlock(&data->update_lock);
 511         return count;
 512 }
 513
 514
 515 /*
 516  * Real code
 517  */
 518
 519 static int gl520_attach_adapter(struct i2c_adapter *adapter)
 520 {
 521         if (!(adapter->class & I2C_CLASS_HWMON))
 522                 return 0;
 523         return i2c_probe(adapter, &addr_data, gl520_detect);
 524 }
 525
 526 static int gl520_detect(struct i2c_adapter *adapter, int address, int kind)
 527 {
 528         struct i2c_client *new_client;
 529         struct gl520_data *data;
 530         int err = 0;
 531
 532         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 533                                      I2C_FUNC_SMBUS_WORD_DATA))
 534                 goto exit;
 535
 536         /* OK. For now, we presume we have a valid client. We now create the
 537            client structure, even though we cannot fill it completely yet.
 538            But it allows us to access gl520_{read,write}_value. */
 539
 540         if (!(data = kzalloc(sizeof(struct gl520_data), GFP_KERNEL))) {
 541                 err = -ENOMEM;
 542                 goto exit;
 543         }
 544
 545         new_client = &data->client;
 546         i2c_set_clientdata(new_client, data);
 547         new_client->addr = address;
 548         new_client->adapter = adapter;
 549         new_client->driver = &gl520_driver;
 550         new_client->flags = 0;
 551
 552         /* Determine the chip type. */
 553         if (kind < 0) {
 554                 if ((gl520_read_value(new_client, GL520_REG_CHIP_ID) != 0x20) ||
 555                     ((gl520_read_value(new_client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
 556                     ((gl520_read_value(new_client, GL520_REG_CONF) & 0x80) != 0x00)) {
 557                         dev_dbg(&new_client->dev, "Unknown chip type, skipping\n");
 558                         goto exit_free;
 559                 }
 560         }
 561
 562         /* Fill in the remaining client fields */
 563         strlcpy(new_client->name, "gl520sm", I2C_NAME_SIZE);
 564         data->valid = 0;
 565         mutex_init(&data->update_lock);
 566
 567         /* Tell the I2C layer a new client has arrived */
 568         if ((err = i2c_attach_client(new_client)))
 569                 goto exit_free;
 570
 571         /* Initialize the GL520SM chip */
 572         gl520_init_client(new_client);
 573
 574         /* Register sysfs hooks */
 575         data->class_dev = hwmon_device_register(&new_client->dev);
 576         if (IS_ERR(data->class_dev)) {
 577                 err = PTR_ERR(data->class_dev);
 578                 goto exit_detach;
 579         }
 580
 581         device_create_file_vid(new_client, 0);
 582
 583         device_create_file_in(new_client, 0);
 584         device_create_file_in(new_client, 1);
 585         device_create_file_in(new_client, 2);
 586         device_create_file_in(new_client, 3);
 587         if (!data->two_temps)
 588                 device_create_file_in(new_client, 4);
 589
 590         device_create_file_fan(new_client, 1);
 591         device_create_file_fan(new_client, 2);
 592         device_create_file_fan_off(new_client, 1);
 593
 594         device_create_file_temp(new_client, 1);
 595         if (data->two_temps)
 596                 device_create_file_temp(new_client, 2);
 597
 598         device_create_file_alarms(new_client);
 599
 600         return 0;
 601
 602 exit_detach:
 603         i2c_detach_client(new_client);
 604 exit_free:
 605         kfree(data);
 606 exit:
 607         return err;
 608 }
 609
 610
 611 /* Called when we have found a new GL520SM. */
 612 static void gl520_init_client(struct i2c_client *client)
 613 {
 614         struct gl520_data *data = i2c_get_clientdata(client);
 615         u8 oldconf, conf;
 616
 617         conf = oldconf = gl520_read_value(client, GL520_REG_CONF);
 618
 619         data->alarm_mask = 0xff;
 620         data->vrm = vid_which_vrm();
 621
 622         if (extra_sensor_type == 1)
 623                 conf &= ~0x10;
 624         else if (extra_sensor_type == 2)
 625                 conf |= 0x10;
 626         data->two_temps = !(conf & 0x10);
 627
 628         /* If IRQ# is disabled, we can safely force comparator mode */
 629         if (!(conf & 0x20))
 630                 conf &= 0xf7;
 631
 632         /* Enable monitoring if needed */
 633         conf |= 0x40;
 634
 635         if (conf != oldconf)
 636                 gl520_write_value(client, GL520_REG_CONF, conf);
 637
 638         gl520_update_device(&(client->dev));
 639
 640         if (data->fan_min[0] == 0)
 641                 data->alarm_mask &= ~0x20;
 642         if (data->fan_min[1] == 0)
 643                 data->alarm_mask &= ~0x40;
 644
 645         data->beep_mask &= data->alarm_mask;
 646         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 647 }
 648
 649 static int gl520_detach_client(struct i2c_client *client)
 650 {
 651         struct gl520_data *data = i2c_get_clientdata(client);
 652         int err;
 653
 654         hwmon_device_unregister(data->class_dev);
 655
 656         if ((err = i2c_detach_client(client)))
 657                 return err;
 658
 659         kfree(data);
 660         return 0;
 661 }
 662
 663
 664 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
 665    GL520 uses a high-byte first convention */
 666 static int gl520_read_value(struct i2c_client *client, u8 reg)
 667 {
 668         if ((reg >= 0x07) && (reg <= 0x0c))
 669                 return swab16(i2c_smbus_read_word_data(client, reg));
 670         else
 671                 return i2c_smbus_read_byte_data(client, reg);
 672 }
 673
 674 static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
 675 {
 676         if ((reg >= 0x07) && (reg <= 0x0c))
 677                 return i2c_smbus_write_word_data(client, reg, swab16(value));
 678         else
 679                 return i2c_smbus_write_byte_data(client, reg, value);
 680 }
 681
 682
 683 static struct gl520_data *gl520_update_device(struct device *dev)
 684 {
 685         struct i2c_client *client = to_i2c_client(dev);
 686         struct gl520_data *data = i2c_get_clientdata(client);
 687         int val;
 688
 689         mutex_lock(&data->update_lock);
 690
 691         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 692
 693                 dev_dbg(&client->dev, "Starting gl520sm update\n");
 694
 695                 data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
 696                 data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 697                 data->vid = gl520_read_value(client, GL520_REG_VID_INPUT) & 0x1f;
 698
 699                 val = gl520_read_value(client, GL520_REG_IN0_LIMIT);
 700                 data->in_min[0] = val & 0xff;
 701                 data->in_max[0] = (val >> 8) & 0xff;
 702                 val = gl520_read_value(client, GL520_REG_IN1_LIMIT);
 703                 data->in_min[1] = val & 0xff;
 704                 data->in_max[1] = (val >> 8) & 0xff;
 705                 val = gl520_read_value(client, GL520_REG_IN2_LIMIT);
 706                 data->in_min[2] = val & 0xff;
 707                 data->in_max[2] = (val >> 8) & 0xff;
 708                 val = gl520_read_value(client, GL520_REG_IN3_LIMIT);
 709                 data->in_min[3] = val & 0xff;
 710                 data->in_max[3] = (val >> 8) & 0xff;
 711
 712                 val = gl520_read_value(client, GL520_REG_FAN_INPUT);
 713                 data->fan_input[0] = (val >> 8) & 0xff;
 714                 data->fan_input[1] = val & 0xff;
 715
 716                 val = gl520_read_value(client, GL520_REG_FAN_MIN);
 717                 data->fan_min[0] = (val >> 8) & 0xff;
 718                 data->fan_min[1] = val & 0xff;
 719
 720                 data->temp_input[0] = gl520_read_value(client, GL520_REG_TEMP1_INPUT);
 721                 data->temp_max[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX);
 722                 data->temp_max_hyst[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX_HYST);
 723
 724                 val = gl520_read_value(client, GL520_REG_FAN_DIV);
 725                 data->fan_div[0] = (val >> 6) & 0x03;
 726                 data->fan_div[1] = (val >> 4) & 0x03;
 727                 data->fan_off = (val >> 2) & 0x01;
 728
 729                 data->alarms &= data->alarm_mask;
 730
 731                 val = gl520_read_value(client, GL520_REG_CONF);
 732                 data->beep_enable = !((val >> 2) & 1);
 733
 734                 data->in_input[0] = gl520_read_value(client, GL520_REG_IN0_INPUT);
 735                 data->in_input[1] = gl520_read_value(client, GL520_REG_IN1_INPUT);
 736                 data->in_input[2] = gl520_read_value(client, GL520_REG_IN2_INPUT);
 737                 data->in_input[3] = gl520_read_value(client, GL520_REG_IN3_INPUT);
 738
 739                 /* Temp1 and Vin4 are the same input */
 740                 if (data->two_temps) {
 741                         data->temp_input[1] = gl520_read_value(client, GL520_REG_TEMP2_INPUT);
 742                         data->temp_max[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX);
 743                         data->temp_max_hyst[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX_HYST);
 744                 } else {
 745                         data->in_input[4] = gl520_read_value(client, GL520_REG_IN4_INPUT);
 746                         data->in_min[4] = gl520_read_value(client, GL520_REG_IN4_MIN);
 747                         data->in_max[4] = gl520_read_value(client, GL520_REG_IN4_MAX);
 748                 }
 749
 750                 data->last_updated = jiffies;
 751                 data->valid = 1;
 752         }
 753
 754         mutex_unlock(&data->update_lock);
 755
 756         return data;
 757 }
 758
 759
 760 static int __init sensors_gl520sm_init(void)
 761 {
 762         return i2c_add_driver(&gl520_driver);
 763 }
 764
 765 static void __exit sensors_gl520sm_exit(void)
 766 {
 767         i2c_del_driver(&gl520_driver);
 768 }
 769
 770
 771 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 772         "Kyösti Mälkki <kmalkki@cc.hut.fi>, "
 773         "Maarten Deprez <maartendeprez@users.sourceforge.net>");
 774 MODULE_DESCRIPTION("GL520SM driver");
 775 MODULE_LICENSE("GPL");
 776
 777 module_init(sensors_gl520sm_init);
 778 module_exit(sensors_gl520sm_exit);