drivers/i2c/chips/lm78.c

   1 /*
   2     lm78.c - Part of lm_sensors, Linux kernel modules for hardware
   3              monitoring
   4     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/i2c.h>
  27 #include <linux/i2c-sensor.h>
  28 #include <asm/io.h>
  29
  30 /* Addresses to scan */
  31 static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
  32                                         0x25, 0x26, 0x27, 0x28, 0x29,
  33                                         0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
  34                                         0x2f, I2C_CLIENT_END };
  35 static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END };
  36
  37 /* Insmod parameters */
  38 SENSORS_INSMOD_3(lm78, lm78j, lm79);
  39
  40 /* Many LM78 constants specified below */
  41
  42 /* Length of ISA address segment */
  43 #define LM78_EXTENT 8
  44
  45 /* Where are the ISA address/data registers relative to the base address */
  46 #define LM78_ADDR_REG_OFFSET 5
  47 #define LM78_DATA_REG_OFFSET 6
  48
  49 /* The LM78 registers */
  50 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
  51 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
  52 #define LM78_REG_IN(nr) (0x20 + (nr))
  53
  54 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
  55 #define LM78_REG_FAN(nr) (0x28 + (nr))
  56
  57 #define LM78_REG_TEMP 0x27
  58 #define LM78_REG_TEMP_OVER 0x39
  59 #define LM78_REG_TEMP_HYST 0x3a
  60
  61 #define LM78_REG_ALARM1 0x41
  62 #define LM78_REG_ALARM2 0x42
  63
  64 #define LM78_REG_VID_FANDIV 0x47
  65
  66 #define LM78_REG_CONFIG 0x40
  67 #define LM78_REG_CHIPID 0x49
  68 #define LM78_REG_I2C_ADDR 0x48
  69
  70
  71 /* Conversions. Rounding and limit checking is only done on the TO_REG
  72    variants. */
  73
  74 /* IN: mV, (0V to 4.08V)
  75    REG: 16mV/bit */
  76 static inline u8 IN_TO_REG(unsigned long val)
  77 {
  78         unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
  79         return (nval + 8) / 16;
  80 }
  81 #define IN_FROM_REG(val) ((val) *  16)
  82
  83 static inline u8 FAN_TO_REG(long rpm, int div)
  84 {
  85         if (rpm <= 0)
  86                 return 255;
  87         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
  88 }
  89
  90 static inline int FAN_FROM_REG(u8 val, int div)
  91 {
  92         return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
  93 }
  94
  95 /* TEMP: mC (-128C to +127C)
  96    REG: 1C/bit, two's complement */
  97 static inline s8 TEMP_TO_REG(int val)
  98 {
  99         int nval = SENSORS_LIMIT(val, -128000, 127000) ;
 100         return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
 101 }
 102
 103 static inline int TEMP_FROM_REG(s8 val)
 104 {
 105         return val * 1000;
 106 }
 107
 108 /* VID: mV
 109    REG: (see doc/vid) */
 110 static inline int VID_FROM_REG(u8 val)
 111 {
 112         return val==0x1f ? 0 : val>=0x10 ? 5100-val*100 : 2050-val*50;
 113 }
 114
 115 #define DIV_FROM_REG(val) (1 << (val))
 116
 117 /* There are some complications in a module like this. First off, LM78 chips
 118    may be both present on the SMBus and the ISA bus, and we have to handle
 119    those cases separately at some places. Second, there might be several
 120    LM78 chips available (well, actually, that is probably never done; but
 121    it is a clean illustration of how to handle a case like that). Finally,
 122    a specific chip may be attached to *both* ISA and SMBus, and we would
 123    not like to detect it double. Fortunately, in the case of the LM78 at
 124    least, a register tells us what SMBus address we are on, so that helps
 125    a bit - except if there could be more than one SMBus. Groan. No solution
 126    for this yet. */
 127
 128 /* This module may seem overly long and complicated. In fact, it is not so
 129    bad. Quite a lot of bookkeeping is done. A real driver can often cut
 130    some corners. */
 131
 132 /* For each registered LM78, we need to keep some data in memory. That
 133    data is pointed to by lm78_list[NR]->data. The structure itself is
 134    dynamically allocated, at the same time when a new lm78 client is
 135    allocated. */
 136 struct lm78_data {
 137         struct i2c_client client;
 138         struct semaphore lock;
 139         enum chips type;
 140
 141         struct semaphore update_lock;
 142         char valid;             /* !=0 if following fields are valid */
 143         unsigned long last_updated;     /* In jiffies */
 144
 145         u8 in[7];               /* Register value */
 146         u8 in_max[7];           /* Register value */
 147         u8 in_min[7];           /* Register value */
 148         u8 fan[3];              /* Register value */
 149         u8 fan_min[3];          /* Register value */
 150         s8 temp;                /* Register value */
 151         s8 temp_over;           /* Register value */
 152         s8 temp_hyst;           /* Register value */
 153         u8 fan_div[3];          /* Register encoding, shifted right */
 154         u8 vid;                 /* Register encoding, combined */
 155         u16 alarms;             /* Register encoding, combined */
 156 };
 157
 158
 159 static int lm78_attach_adapter(struct i2c_adapter *adapter);
 160 static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
 161 static int lm78_detach_client(struct i2c_client *client);
 162
 163 static int lm78_read_value(struct i2c_client *client, u8 register);
 164 static int lm78_write_value(struct i2c_client *client, u8 register, u8 value);
 165 static struct lm78_data *lm78_update_device(struct device *dev);
 166 static void lm78_init_client(struct i2c_client *client);
 167
 168
 169 static struct i2c_driver lm78_driver = {
 170         .owner          = THIS_MODULE,
 171         .name           = "lm78",
 172         .id             = I2C_DRIVERID_LM78,
 173         .flags          = I2C_DF_NOTIFY,
 174         .attach_adapter = lm78_attach_adapter,
 175         .detach_client  = lm78_detach_client,
 176 };
 177
 178 /* 7 Voltages */
 179 static ssize_t show_in(struct device *dev, char *buf, int nr)
 180 {
 181         struct lm78_data *data = lm78_update_device(dev);
 182         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
 183 }
 184
 185 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
 186 {
 187         struct lm78_data *data = lm78_update_device(dev);
 188         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
 189 }
 190
 191 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
 192 {
 193         struct lm78_data *data = lm78_update_device(dev);
 194         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
 195 }
 196
 197 static ssize_t set_in_min(struct device *dev, const char *buf,
 198                 size_t count, int nr)
 199 {
 200         struct i2c_client *client = to_i2c_client(dev);
 201         struct lm78_data *data = i2c_get_clientdata(client);
 202         unsigned long val = simple_strtoul(buf, NULL, 10);
 203
 204         down(&data->update_lock);
 205         data->in_min[nr] = IN_TO_REG(val);
 206         lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]);
 207         up(&data->update_lock);
 208         return count;
 209 }
 210
 211 static ssize_t set_in_max(struct device *dev, const char *buf,
 212                 size_t count, int nr)
 213 {
 214         struct i2c_client *client = to_i2c_client(dev);
 215         struct lm78_data *data = i2c_get_clientdata(client);
 216         unsigned long val = simple_strtoul(buf, NULL, 10);
 217
 218         down(&data->update_lock);
 219         data->in_max[nr] = IN_TO_REG(val);
 220         lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]);
 221         up(&data->update_lock);
 222         return count;
 223 }
 224
 225 #define show_in_offset(offset)                                  \
 226 static ssize_t                                                  \
 227         show_in##offset (struct device *dev, char *buf)         \
 228 {                                                               \
 229         return show_in(dev, buf, offset);                       \
 230 }                                                               \
 231 static DEVICE_ATTR(in##offset##_input, S_IRUGO,                 \
 232                 show_in##offset, NULL);                         \
 233 static ssize_t                                                  \
 234         show_in##offset##_min (struct device *dev, char *buf)   \
 235 {                                                               \
 236         return show_in_min(dev, buf, offset);                   \
 237 }                                                               \
 238 static ssize_t                                                  \
 239         show_in##offset##_max (struct device *dev, char *buf)   \
 240 {                                                               \
 241         return show_in_max(dev, buf, offset);                   \
 242 }                                                               \
 243 static ssize_t set_in##offset##_min (struct device *dev,        \
 244                 const char *buf, size_t count)                  \
 245 {                                                               \
 246         return set_in_min(dev, buf, count, offset);             \
 247 }                                                               \
 248 static ssize_t set_in##offset##_max (struct device *dev,        \
 249                 const char *buf, size_t count)                  \
 250 {                                                               \
 251         return set_in_max(dev, buf, count, offset);             \
 252 }                                                               \
 253 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,         \
 254                 show_in##offset##_min, set_in##offset##_min);   \
 255 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,         \
 256                 show_in##offset##_max, set_in##offset##_max);
 257
 258 show_in_offset(0);
 259 show_in_offset(1);
 260 show_in_offset(2);
 261 show_in_offset(3);
 262 show_in_offset(4);
 263 show_in_offset(5);
 264 show_in_offset(6);
 265
 266 /* Temperature */
 267 static ssize_t show_temp(struct device *dev, char *buf)
 268 {
 269         struct lm78_data *data = lm78_update_device(dev);
 270         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
 271 }
 272
 273 static ssize_t show_temp_over(struct device *dev, char *buf)
 274 {
 275         struct lm78_data *data = lm78_update_device(dev);
 276         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
 277 }
 278
 279 static ssize_t set_temp_over(struct device *dev, const char *buf, size_t count)
 280 {
 281         struct i2c_client *client = to_i2c_client(dev);
 282         struct lm78_data *data = i2c_get_clientdata(client);
 283         long val = simple_strtol(buf, NULL, 10);
 284
 285         down(&data->update_lock);
 286         data->temp_over = TEMP_TO_REG(val);
 287         lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over);
 288         up(&data->update_lock);
 289         return count;
 290 }
 291
 292 static ssize_t show_temp_hyst(struct device *dev, char *buf)
 293 {
 294         struct lm78_data *data = lm78_update_device(dev);
 295         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
 296 }
 297
 298 static ssize_t set_temp_hyst(struct device *dev, const char *buf, size_t count)
 299 {
 300         struct i2c_client *client = to_i2c_client(dev);
 301         struct lm78_data *data = i2c_get_clientdata(client);
 302         long val = simple_strtol(buf, NULL, 10);
 303
 304         down(&data->update_lock);
 305         data->temp_hyst = TEMP_TO_REG(val);
 306         lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst);
 307         up(&data->update_lock);
 308         return count;
 309 }
 310
 311 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 312 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
 313                 show_temp_over, set_temp_over);
 314 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
 315                 show_temp_hyst, set_temp_hyst);
 316
 317 /* 3 Fans */
 318 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 319 {
 320         struct lm78_data *data = lm78_update_device(dev);
 321         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 322                 DIV_FROM_REG(data->fan_div[nr])) );
 323 }
 324
 325 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 326 {
 327         struct lm78_data *data = lm78_update_device(dev);
 328         return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr],
 329                 DIV_FROM_REG(data->fan_div[nr])) );
 330 }
 331
 332 static ssize_t set_fan_min(struct device *dev, const char *buf,
 333                 size_t count, int nr)
 334 {
 335         struct i2c_client *client = to_i2c_client(dev);
 336         struct lm78_data *data = i2c_get_clientdata(client);
 337         unsigned long val = simple_strtoul(buf, NULL, 10);
 338
 339         down(&data->update_lock);
 340         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 341         lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
 342         up(&data->update_lock);
 343         return count;
 344 }
 345
 346 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 347 {
 348         struct lm78_data *data = lm78_update_device(dev);
 349         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
 350 }
 351
 352 /* Note: we save and restore the fan minimum here, because its value is
 353    determined in part by the fan divisor.  This follows the principle of
 354    least suprise; the user doesn't expect the fan minimum to change just
 355    because the divisor changed. */
 356 static ssize_t set_fan_div(struct device *dev, const char *buf,
 357         size_t count, int nr)
 358 {
 359         struct i2c_client *client = to_i2c_client(dev);
 360         struct lm78_data *data = i2c_get_clientdata(client);
 361         unsigned long val = simple_strtoul(buf, NULL, 10);
 362         unsigned long min;
 363         u8 reg;
 364
 365         down(&data->update_lock);
 366         min = FAN_FROM_REG(data->fan_min[nr],
 367                            DIV_FROM_REG(data->fan_div[nr]));
 368
 369         switch (val) {
 370         case 1: data->fan_div[nr] = 0; break;
 371         case 2: data->fan_div[nr] = 1; break;
 372         case 4: data->fan_div[nr] = 2; break;
 373         case 8: data->fan_div[nr] = 3; break;
 374         default:
 375                 dev_err(&client->dev, "fan_div value %ld not "
 376                         "supported. Choose one of 1, 2, 4 or 8!\n", val);
 377                 up(&data->update_lock);
 378                 return -EINVAL;
 379         }
 380
 381         reg = lm78_read_value(client, LM78_REG_VID_FANDIV);
 382         switch (nr) {
 383         case 0:
 384                 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
 385                 break;
 386         case 1:
 387                 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
 388                 break;
 389         }
 390         lm78_write_value(client, LM78_REG_VID_FANDIV, reg);
 391
 392         data->fan_min[nr] =
 393                 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 394         lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
 395         up(&data->update_lock);
 396
 397         return count;
 398 }
 399
 400 #define show_fan_offset(offset)                                         \
 401 static ssize_t show_fan_##offset (struct device *dev, char *buf)        \
 402 {                                                                       \
 403         return show_fan(dev, buf, offset - 1);                          \
 404 }                                                                       \
 405 static ssize_t show_fan_##offset##_min (struct device *dev, char *buf)  \
 406 {                                                                       \
 407         return show_fan_min(dev, buf, offset - 1);                      \
 408 }                                                                       \
 409 static ssize_t show_fan_##offset##_div (struct device *dev, char *buf)  \
 410 {                                                                       \
 411         return show_fan_div(dev, buf, offset - 1);                      \
 412 }                                                                       \
 413 static ssize_t set_fan_##offset##_min (struct device *dev,              \
 414                 const char *buf, size_t count)                          \
 415 {                                                                       \
 416         return set_fan_min(dev, buf, count, offset - 1);                \
 417 }                                                                       \
 418 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
 419 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 420                 show_fan_##offset##_min, set_fan_##offset##_min);
 421
 422 static ssize_t set_fan_1_div(struct device *dev, const char *buf,
 423                 size_t count)
 424 {
 425         return set_fan_div(dev, buf, count, 0) ;
 426 }
 427
 428 static ssize_t set_fan_2_div(struct device *dev, const char *buf,
 429                 size_t count)
 430 {
 431         return set_fan_div(dev, buf, count, 1) ;
 432 }
 433
 434 show_fan_offset(1);
 435 show_fan_offset(2);
 436 show_fan_offset(3);
 437
 438 /* Fan 3 divisor is locked in H/W */
 439 static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 440                 show_fan_1_div, set_fan_1_div);
 441 static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
 442                 show_fan_2_div, set_fan_2_div);
 443 static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL);
 444
 445 /* VID */
 446 static ssize_t show_vid(struct device *dev, char *buf)
 447 {
 448         struct lm78_data *data = lm78_update_device(dev);
 449         return sprintf(buf, "%d\n", VID_FROM_REG(data->vid));
 450 }
 451 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 452
 453 /* Alarms */
 454 static ssize_t show_alarms(struct device *dev, char *buf)
 455 {
 456         struct lm78_data *data = lm78_update_device(dev);
 457         return sprintf(buf, "%u\n", data->alarms);
 458 }
 459 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 460
 461 /* This function is called when:
 462      * lm78_driver is inserted (when this module is loaded), for each
 463        available adapter
 464      * when a new adapter is inserted (and lm78_driver is still present) */
 465 static int lm78_attach_adapter(struct i2c_adapter *adapter)
 466 {
 467         if (!(adapter->class & I2C_CLASS_HWMON))
 468                 return 0;
 469         return i2c_detect(adapter, &addr_data, lm78_detect);
 470 }
 471
 472 /* This function is called by i2c_detect */
 473 int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
 474 {
 475         int i, err;
 476         struct i2c_client *new_client;
 477         struct lm78_data *data;
 478         const char *client_name = "";
 479         int is_isa = i2c_is_isa_adapter(adapter);
 480
 481         if (!is_isa &&
 482             !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 483                 err = -ENODEV;
 484                 goto ERROR0;
 485         }
 486
 487         /* Reserve the ISA region */
 488         if (is_isa)
 489                 if (!request_region(address, LM78_EXTENT, lm78_driver.name)) {
 490                         err = -EBUSY;
 491                         goto ERROR0;
 492                 }
 493
 494         /* Probe whether there is anything available on this address. Already
 495            done for SMBus clients */
 496         if (kind < 0) {
 497                 if (is_isa) {
 498
 499 #define REALLY_SLOW_IO
 500                         /* We need the timeouts for at least some LM78-like
 501                            chips. But only if we read 'undefined' registers. */
 502                         i = inb_p(address + 1);
 503                         if (inb_p(address + 2) != i) {
 504                                 err = -ENODEV;
 505                                 goto ERROR1;
 506                         }
 507                         if (inb_p(address + 3) != i) {
 508                                 err = -ENODEV;
 509                                 goto ERROR1;
 510                         }
 511                         if (inb_p(address + 7) != i) {
 512                                 err = -ENODEV;
 513                                 goto ERROR1;
 514                         }
 515 #undef REALLY_SLOW_IO
 516
 517                         /* Let's just hope nothing breaks here */
 518                         i = inb_p(address + 5) & 0x7f;
 519                         outb_p(~i & 0x7f, address + 5);
 520                         if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
 521                                 outb_p(i, address + 5);
 522                                 err = -ENODEV;
 523                                 goto ERROR1;
 524                         }
 525                 }
 526         }
 527
 528         /* OK. For now, we presume we have a valid client. We now create the
 529            client structure, even though we cannot fill it completely yet.
 530            But it allows us to access lm78_{read,write}_value. */
 531
 532         if (!(data = kmalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
 533                 err = -ENOMEM;
 534                 goto ERROR1;
 535         }
 536         memset(data, 0, sizeof(struct lm78_data));
 537
 538         new_client = &data->client;
 539         if (is_isa)
 540                 init_MUTEX(&data->lock);
 541         i2c_set_clientdata(new_client, data);
 542         new_client->addr = address;
 543         new_client->adapter = adapter;
 544         new_client->driver = &lm78_driver;
 545         new_client->flags = 0;
 546
 547         /* Now, we do the remaining detection. */
 548         if (kind < 0) {
 549                 if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) {
 550                         err = -ENODEV;
 551                         goto ERROR2;
 552                 }
 553                 if (!is_isa && (lm78_read_value(
 554                                 new_client, LM78_REG_I2C_ADDR) != address)) {
 555                         err = -ENODEV;
 556                         goto ERROR2;
 557                 }
 558         }
 559
 560         /* Determine the chip type. */
 561         if (kind <= 0) {
 562                 i = lm78_read_value(new_client, LM78_REG_CHIPID);
 563                 if (i == 0x00 || i == 0x20)
 564                         kind = lm78;
 565                 else if (i == 0x40)
 566                         kind = lm78j;
 567                 else if ((i & 0xfe) == 0xc0)
 568                         kind = lm79;
 569                 else {
 570                         if (kind == 0)
 571                                 dev_warn(&adapter->dev, "Ignoring 'force' "
 572                                         "parameter for unknown chip at "
 573                                         "adapter %d, address 0x%02x\n",
 574                                         i2c_adapter_id(adapter), address);
 575                         err = -ENODEV;
 576                         goto ERROR2;
 577                 }
 578         }
 579
 580         if (kind == lm78) {
 581                 client_name = "lm78";
 582         } else if (kind == lm78j) {
 583                 client_name = "lm78-j";
 584         } else if (kind == lm79) {
 585                 client_name = "lm79";
 586         }
 587
 588         /* Fill in the remaining client fields and put into the global list */
 589         strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
 590         data->type = kind;
 591
 592         data->valid = 0;
 593         init_MUTEX(&data->update_lock);
 594
 595         /* Tell the I2C layer a new client has arrived */
 596         if ((err = i2c_attach_client(new_client)))
 597                 goto ERROR2;
 598
 599         /* Initialize the LM78 chip */
 600         lm78_init_client(new_client);
 601
 602         /* A few vars need to be filled upon startup */
 603         for (i = 0; i < 3; i++) {
 604                 data->fan_min[i] = lm78_read_value(new_client,
 605                                         LM78_REG_FAN_MIN(i));
 606         }
 607
 608         /* Register sysfs hooks */
 609         device_create_file(&new_client->dev, &dev_attr_in0_input);
 610         device_create_file(&new_client->dev, &dev_attr_in0_min);
 611         device_create_file(&new_client->dev, &dev_attr_in0_max);
 612         device_create_file(&new_client->dev, &dev_attr_in1_input);
 613         device_create_file(&new_client->dev, &dev_attr_in1_min);
 614         device_create_file(&new_client->dev, &dev_attr_in1_max);
 615         device_create_file(&new_client->dev, &dev_attr_in2_input);
 616         device_create_file(&new_client->dev, &dev_attr_in2_min);
 617         device_create_file(&new_client->dev, &dev_attr_in2_max);
 618         device_create_file(&new_client->dev, &dev_attr_in3_input);
 619         device_create_file(&new_client->dev, &dev_attr_in3_min);
 620         device_create_file(&new_client->dev, &dev_attr_in3_max);
 621         device_create_file(&new_client->dev, &dev_attr_in4_input);
 622         device_create_file(&new_client->dev, &dev_attr_in4_min);
 623         device_create_file(&new_client->dev, &dev_attr_in4_max);
 624         device_create_file(&new_client->dev, &dev_attr_in5_input);
 625         device_create_file(&new_client->dev, &dev_attr_in5_min);
 626         device_create_file(&new_client->dev, &dev_attr_in5_max);
 627         device_create_file(&new_client->dev, &dev_attr_in6_input);
 628         device_create_file(&new_client->dev, &dev_attr_in6_min);
 629         device_create_file(&new_client->dev, &dev_attr_in6_max);
 630         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 631         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 632         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 633         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 634         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 635         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 636         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 637         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 638         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 639         device_create_file(&new_client->dev, &dev_attr_fan3_input);
 640         device_create_file(&new_client->dev, &dev_attr_fan3_min);
 641         device_create_file(&new_client->dev, &dev_attr_fan3_div);
 642         device_create_file(&new_client->dev, &dev_attr_alarms);
 643         device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
 644
 645         return 0;
 646
 647 ERROR2:
 648         kfree(data);
 649 ERROR1:
 650         if (is_isa)
 651                 release_region(address, LM78_EXTENT);
 652 ERROR0:
 653         return err;
 654 }
 655
 656 static int lm78_detach_client(struct i2c_client *client)
 657 {
 658         int err;
 659
 660         if ((err = i2c_detach_client(client))) {
 661                 dev_err(&client->dev,
 662                     "Client deregistration failed, client not detached.\n");
 663                 return err;
 664         }
 665
 666         if(i2c_is_isa_client(client))
 667                 release_region(client->addr, LM78_EXTENT);
 668
 669         kfree(i2c_get_clientdata(client));
 670
 671         return 0;
 672 }
 673
 674 /* The SMBus locks itself, but ISA access must be locked explicitely!
 675    We don't want to lock the whole ISA bus, so we lock each client
 676    separately.
 677    We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
 678    would slow down the LM78 access and should not be necessary.  */
 679 static int lm78_read_value(struct i2c_client *client, u8 reg)
 680 {
 681         int res;
 682         if (i2c_is_isa_client(client)) {
 683                 struct lm78_data *data = i2c_get_clientdata(client);
 684                 down(&data->lock);
 685                 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
 686                 res = inb_p(client->addr + LM78_DATA_REG_OFFSET);
 687                 up(&data->lock);
 688                 return res;
 689         } else
 690                 return i2c_smbus_read_byte_data(client, reg);
 691 }
 692
 693 /* The SMBus locks itself, but ISA access muse be locked explicitely!
 694    We don't want to lock the whole ISA bus, so we lock each client
 695    separately.
 696    We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
 697    would slow down the LM78 access and should not be necessary.
 698    There are some ugly typecasts here, but the good new is - they should
 699    nowhere else be necessary! */
 700 static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
 701 {
 702         if (i2c_is_isa_client(client)) {
 703                 struct lm78_data *data = i2c_get_clientdata(client);
 704                 down(&data->lock);
 705                 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
 706                 outb_p(value, client->addr + LM78_DATA_REG_OFFSET);
 707                 up(&data->lock);
 708                 return 0;
 709         } else
 710                 return i2c_smbus_write_byte_data(client, reg, value);
 711 }
 712
 713 /* Called when we have found a new LM78. It should set limits, etc. */
 714 static void lm78_init_client(struct i2c_client *client)
 715 {
 716         u8 config = lm78_read_value(client, LM78_REG_CONFIG);
 717
 718         /* Start monitoring */
 719         if (!(config & 0x01))
 720                 lm78_write_value(client, LM78_REG_CONFIG,
 721                                  (config & 0xf7) | 0x01);
 722 }
 723
 724 static struct lm78_data *lm78_update_device(struct device *dev)
 725 {
 726         struct i2c_client *client = to_i2c_client(dev);
 727         struct lm78_data *data = i2c_get_clientdata(client);
 728         int i;
 729
 730         down(&data->update_lock);
 731
 732         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 733             || !data->valid) {
 734
 735                 dev_dbg(&client->dev, "Starting lm78 update\n");
 736
 737                 for (i = 0; i <= 6; i++) {
 738                         data->in[i] =
 739                             lm78_read_value(client, LM78_REG_IN(i));
 740                         data->in_min[i] =
 741                             lm78_read_value(client, LM78_REG_IN_MIN(i));
 742                         data->in_max[i] =
 743                             lm78_read_value(client, LM78_REG_IN_MAX(i));
 744                 }
 745                 for (i = 0; i < 3; i++) {
 746                         data->fan[i] =
 747                             lm78_read_value(client, LM78_REG_FAN(i));
 748                         data->fan_min[i] =
 749                             lm78_read_value(client, LM78_REG_FAN_MIN(i));
 750                 }
 751                 data->temp = lm78_read_value(client, LM78_REG_TEMP);
 752                 data->temp_over =
 753                     lm78_read_value(client, LM78_REG_TEMP_OVER);
 754                 data->temp_hyst =
 755                     lm78_read_value(client, LM78_REG_TEMP_HYST);
 756                 i = lm78_read_value(client, LM78_REG_VID_FANDIV);
 757                 data->vid = i & 0x0f;
 758                 if (data->type == lm79)
 759                         data->vid |=
 760                             (lm78_read_value(client, LM78_REG_CHIPID) &
 761                              0x01) << 4;
 762                 else
 763                         data->vid |= 0x10;
 764                 data->fan_div[0] = (i >> 4) & 0x03;
 765                 data->fan_div[1] = i >> 6;
 766                 data->alarms = lm78_read_value(client, LM78_REG_ALARM1) +
 767                     (lm78_read_value(client, LM78_REG_ALARM2) << 8);
 768                 data->last_updated = jiffies;
 769                 data->valid = 1;
 770
 771                 data->fan_div[2] = 1;
 772         }
 773
 774         up(&data->update_lock);
 775
 776         return data;
 777 }
 778
 779 static int __init sm_lm78_init(void)
 780 {
 781         return i2c_add_driver(&lm78_driver);
 782 }
 783
 784 static void __exit sm_lm78_exit(void)
 785 {
 786         i2c_del_driver(&lm78_driver);
 787 }
 788
 789
 790
 791 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
 792 MODULE_DESCRIPTION("LM78, LM78-J and LM79 driver");
 793 MODULE_LICENSE("GPL");
 794
 795 module_init(sm_lm78_init);
 796 module_exit(sm_lm78_exit);