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