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   1 /*
   2  * lm87.c
   3  *
   4  * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
   5  *                          Philip Edelbrock <phil@netroedge.com>
   6  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
   7  *                          Dan Eaton <dan.eaton@rocketlogix.com>
   8  * Copyright (C) 2004       Jean Delvare <khali@linux-fr.org>
   9  *
  10  * Original port to Linux 2.6 by Jeff Oliver.
  11  *
  12  * The LM87 is a sensor chip made by National Semiconductor. It monitors up
  13  * to 8 voltages (including its own power source), up to three temperatures
  14  * (its own plus up to two external ones) and up to two fans. The default
  15  * configuration is 6 voltages, two temperatures and two fans (see below).
  16  * Voltages are scaled internally with ratios such that the nominal value of
  17  * each voltage correspond to a register value of 192 (which means a
  18  * resolution of about 0.5% of the nominal value). Temperature values are
  19  * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
  20  * datasheet can be obtained from National's website at:
  21  *   http://www.national.com/pf/LM/LM87.html
  22  *
  23  * Some functions share pins, so not all functions are available at the same
  24  * time. Which are depends on the hardware setup. This driver assumes that
  25  * the BIOS configured the chip correctly. In that respect, it  differs from
  26  * the original driver (from lm_sensors for Linux 2.4), which would force the
  27  * LM87 to an arbitrary, compile-time chosen mode, regardless of the actual
  28  * chipset wiring.
  29  * For reference, here is the list of exclusive functions:
  30  *  - in0+in5 (default) or temp3
  31  *  - fan1 (default) or in6
  32  *  - fan2 (default) or in7
  33  *  - VID lines (default) or IRQ lines (not handled by this driver)
  34  *
  35  * The LM87 additionally features an analog output, supposedly usable to
  36  * control the speed of a fan. All new chips use pulse width modulation
  37  * instead. The LM87 is the only hardware monitoring chipset I know of
  38  * which uses amplitude modulation. Be careful when using this feature.
  39  *
  40  * This program is free software; you can redistribute it and/or modify
  41  * it under the terms of the GNU General Public License as published by
  42  * the Free Software Foundation; either version 2 of the License, or
  43  * (at your option) any later version.
  44  *
  45  * This program is distributed in the hope that it will be useful,
  46  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  47  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  48  * GNU General Public License for more details.
  49  *
  50  * You should have received a copy of the GNU General Public License
  51  * along with this program; if not, write to the Free Software
  52  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  53  */
  54
  55 #include <linux/module.h>
  56 #include <linux/init.h>
  57 #include <linux/slab.h>
  58 #include <linux/jiffies.h>
  59 #include <linux/i2c.h>
  60 #include <linux/hwmon.h>
  61 #include <linux/hwmon-sysfs.h>
  62 #include <linux/hwmon-vid.h>
  63 #include <linux/err.h>
  64 #include <linux/mutex.h>
  65
  66 /*
  67  * Addresses to scan
  68  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  69  */
  70
  71 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  72
  73 /*
  74  * Insmod parameters
  75  */
  76
  77 I2C_CLIENT_INSMOD_1(lm87);
  78
  79 /*
  80  * The LM87 registers
  81  */
  82
  83 /* nr in 0..5 */
  84 #define LM87_REG_IN(nr)                 (0x20 + (nr))
  85 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  86 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  87 /* nr in 0..1 */
  88 #define LM87_REG_AIN(nr)                (0x28 + (nr))
  89 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  90 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  91
  92 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  93 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  94 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  95
  96 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
  97 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
  98 #define LM87_REG_TEMP_HW_INT            0x17
  99 #define LM87_REG_TEMP_HW_EXT            0x18
 100
 101 /* nr in 0..1 */
 102 #define LM87_REG_FAN(nr)                (0x28 + (nr))
 103 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
 104 #define LM87_REG_AOUT                   0x19
 105
 106 #define LM87_REG_CONFIG                 0x40
 107 #define LM87_REG_CHANNEL_MODE           0x16
 108 #define LM87_REG_VID_FAN_DIV            0x47
 109 #define LM87_REG_VID4                   0x49
 110
 111 #define LM87_REG_ALARMS1                0x41
 112 #define LM87_REG_ALARMS2                0x42
 113
 114 #define LM87_REG_COMPANY_ID             0x3E
 115 #define LM87_REG_REVISION               0x3F
 116
 117 /*
 118  * Conversions and various macros
 119  * The LM87 uses signed 8-bit values for temperatures.
 120  */
 121
 122 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
 123 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
 124                                  (val) * 192 >= (scale) * 255 ? 255 : \
 125                                  ((val) * 192 + (scale)/2) / (scale))
 126
 127 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 128 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 129                                  (val) >= 126500 ? 127 : \
 130                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
 131
 132 #define FAN_FROM_REG(reg,div)   ((reg) == 255 || (reg) == 0 ? 0 : \
 133                                  (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
 134 #define FAN_TO_REG(val,div)     ((val)*(div) * 255 <= 1350000 ? 255 : \
 135                                  (1350000 + (val)*(div) / 2) / ((val)*(div)))
 136
 137 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 138
 139 /* analog out is 9.80mV/LSB */
 140 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
 141 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
 142                                  (val) >= 2500 ? 255 : \
 143                                  ((val) * 10 + 49) / 98)
 144
 145 /* nr in 0..1 */
 146 #define CHAN_NO_FAN(nr)         (1 << (nr))
 147 #define CHAN_TEMP3              (1 << 2)
 148 #define CHAN_VCC_5V             (1 << 3)
 149 #define CHAN_NO_VID             (1 << 7)
 150
 151 /*
 152  * Functions declaration
 153  */
 154
 155 static int lm87_attach_adapter(struct i2c_adapter *adapter);
 156 static int lm87_detect(struct i2c_adapter *adapter, int address, int kind);
 157 static void lm87_init_client(struct i2c_client *client);
 158 static int lm87_detach_client(struct i2c_client *client);
 159 static struct lm87_data *lm87_update_device(struct device *dev);
 160
 161 /*
 162  * Driver data (common to all clients)
 163  */
 164
 165 static struct i2c_driver lm87_driver = {
 166         .driver = {
 167                 .name   = "lm87",
 168         },
 169         .id             = I2C_DRIVERID_LM87,
 170         .attach_adapter = lm87_attach_adapter,
 171         .detach_client  = lm87_detach_client,
 172 };
 173
 174 /*
 175  * Client data (each client gets its own)
 176  */
 177
 178 struct lm87_data {
 179         struct i2c_client client;
 180         struct device *hwmon_dev;
 181         struct mutex update_lock;
 182         char valid; /* zero until following fields are valid */
 183         unsigned long last_updated; /* In jiffies */
 184
 185         u8 channel;             /* register value */
 186
 187         u8 in[8];               /* register value */
 188         u8 in_max[8];           /* register value */
 189         u8 in_min[8];           /* register value */
 190         u16 in_scale[8];
 191
 192         s8 temp[3];             /* register value */
 193         s8 temp_high[3];        /* register value */
 194         s8 temp_low[3];         /* register value */
 195         s8 temp_crit_int;       /* min of two register values */
 196         s8 temp_crit_ext;       /* min of two register values */
 197
 198         u8 fan[2];              /* register value */
 199         u8 fan_min[2];          /* register value */
 200         u8 fan_div[2];          /* register value, shifted right */
 201         u8 aout;                /* register value */
 202
 203         u16 alarms;             /* register values, combined */
 204         u8 vid;                 /* register values, combined */
 205         u8 vrm;
 206 };
 207
 208 /*
 209  * Sysfs stuff
 210  */
 211
 212 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 213 {
 214         return i2c_smbus_read_byte_data(client, reg);
 215 }
 216
 217 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 218 {
 219         return i2c_smbus_write_byte_data(client, reg, value);
 220 }
 221
 222 #define show_in(offset) \
 223 static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 224 { \
 225         struct lm87_data *data = lm87_update_device(dev); \
 226         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
 227                        data->in_scale[offset])); \
 228 } \
 229 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 230 { \
 231         struct lm87_data *data = lm87_update_device(dev); \
 232         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
 233                        data->in_scale[offset])); \
 234 } \
 235 static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
 236 { \
 237         struct lm87_data *data = lm87_update_device(dev); \
 238         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
 239                        data->in_scale[offset])); \
 240 } \
 241 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 242                 show_in##offset##_input, NULL);
 243 show_in(0);
 244 show_in(1);
 245 show_in(2);
 246 show_in(3);
 247 show_in(4);
 248 show_in(5);
 249 show_in(6);
 250 show_in(7);
 251
 252 static void set_in_min(struct device *dev, const char *buf, int nr)
 253 {
 254         struct i2c_client *client = to_i2c_client(dev);
 255         struct lm87_data *data = i2c_get_clientdata(client);
 256         long val = simple_strtol(buf, NULL, 10);
 257
 258         mutex_lock(&data->update_lock);
 259         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 260         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
 261                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
 262         mutex_unlock(&data->update_lock);
 263 }
 264
 265 static void set_in_max(struct device *dev, const char *buf, int nr)
 266 {
 267         struct i2c_client *client = to_i2c_client(dev);
 268         struct lm87_data *data = i2c_get_clientdata(client);
 269         long val = simple_strtol(buf, NULL, 10);
 270
 271         mutex_lock(&data->update_lock);
 272         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 273         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
 274                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
 275         mutex_unlock(&data->update_lock);
 276 }
 277
 278 #define set_in(offset) \
 279 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
 280                 const char *buf, size_t count) \
 281 { \
 282         set_in_min(dev, buf, offset); \
 283         return count; \
 284 } \
 285 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
 286                 const char *buf, size_t count) \
 287 { \
 288         set_in_max(dev, buf, offset); \
 289         return count; \
 290 } \
 291 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 292                 show_in##offset##_min, set_in##offset##_min); \
 293 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 294                 show_in##offset##_max, set_in##offset##_max);
 295 set_in(0);
 296 set_in(1);
 297 set_in(2);
 298 set_in(3);
 299 set_in(4);
 300 set_in(5);
 301 set_in(6);
 302 set_in(7);
 303
 304 #define show_temp(offset) \
 305 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 306 { \
 307         struct lm87_data *data = lm87_update_device(dev); \
 308         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
 309 } \
 310 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
 311 { \
 312         struct lm87_data *data = lm87_update_device(dev); \
 313         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
 314 } \
 315 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
 316 { \
 317         struct lm87_data *data = lm87_update_device(dev); \
 318         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
 319 }\
 320 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 321                 show_temp##offset##_input, NULL);
 322 show_temp(1);
 323 show_temp(2);
 324 show_temp(3);
 325
 326 static void set_temp_low(struct device *dev, const char *buf, int nr)
 327 {
 328         struct i2c_client *client = to_i2c_client(dev);
 329         struct lm87_data *data = i2c_get_clientdata(client);
 330         long val = simple_strtol(buf, NULL, 10);
 331
 332         mutex_lock(&data->update_lock);
 333         data->temp_low[nr] = TEMP_TO_REG(val);
 334         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 335         mutex_unlock(&data->update_lock);
 336 }
 337
 338 static void set_temp_high(struct device *dev, const char *buf, int nr)
 339 {
 340         struct i2c_client *client = to_i2c_client(dev);
 341         struct lm87_data *data = i2c_get_clientdata(client);
 342         long val = simple_strtol(buf, NULL, 10);
 343
 344         mutex_lock(&data->update_lock);
 345         data->temp_high[nr] = TEMP_TO_REG(val);
 346         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 347         mutex_unlock(&data->update_lock);
 348 }
 349
 350 #define set_temp(offset) \
 351 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
 352                 const char *buf, size_t count) \
 353 { \
 354         set_temp_low(dev, buf, offset-1); \
 355         return count; \
 356 } \
 357 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
 358                 const char *buf, size_t count) \
 359 { \
 360         set_temp_high(dev, buf, offset-1); \
 361         return count; \
 362 } \
 363 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 364                 show_temp##offset##_high, set_temp##offset##_high); \
 365 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 366                 show_temp##offset##_low, set_temp##offset##_low);
 367 set_temp(1);
 368 set_temp(2);
 369 set_temp(3);
 370
 371 static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
 372 {
 373         struct lm87_data *data = lm87_update_device(dev);
 374         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 375 }
 376
 377 static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
 378 {
 379         struct lm87_data *data = lm87_update_device(dev);
 380         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 381 }
 382
 383 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 384 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 385 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 386
 387 #define show_fan(offset) \
 388 static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 389 { \
 390         struct lm87_data *data = lm87_update_device(dev); \
 391         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
 392                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 393 } \
 394 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 395 { \
 396         struct lm87_data *data = lm87_update_device(dev); \
 397         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
 398                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 399 } \
 400 static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
 401 { \
 402         struct lm87_data *data = lm87_update_device(dev); \
 403         return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
 404 } \
 405 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 406                 show_fan##offset##_input, NULL);
 407 show_fan(1);
 408 show_fan(2);
 409
 410 static void set_fan_min(struct device *dev, const char *buf, int nr)
 411 {
 412         struct i2c_client *client = to_i2c_client(dev);
 413         struct lm87_data *data = i2c_get_clientdata(client);
 414         long val = simple_strtol(buf, NULL, 10);
 415
 416         mutex_lock(&data->update_lock);
 417         data->fan_min[nr] = FAN_TO_REG(val,
 418                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 419         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 420         mutex_unlock(&data->update_lock);
 421 }
 422
 423 /* Note: we save and restore the fan minimum here, because its value is
 424    determined in part by the fan clock divider.  This follows the principle
 425    of least surprise; the user doesn't expect the fan minimum to change just
 426    because the divider changed. */
 427 static ssize_t set_fan_div(struct device *dev, const char *buf,
 428                 size_t count, int nr)
 429 {
 430         struct i2c_client *client = to_i2c_client(dev);
 431         struct lm87_data *data = i2c_get_clientdata(client);
 432         long val = simple_strtol(buf, NULL, 10);
 433         unsigned long min;
 434         u8 reg;
 435
 436         mutex_lock(&data->update_lock);
 437         min = FAN_FROM_REG(data->fan_min[nr],
 438                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 439
 440         switch (val) {
 441         case 1: data->fan_div[nr] = 0; break;
 442         case 2: data->fan_div[nr] = 1; break;
 443         case 4: data->fan_div[nr] = 2; break;
 444         case 8: data->fan_div[nr] = 3; break;
 445         default:
 446                 mutex_unlock(&data->update_lock);
 447                 return -EINVAL;
 448         }
 449
 450         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 451         switch (nr) {
 452         case 0:
 453             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 454             break;
 455         case 1:
 456             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 457             break;
 458         }
 459         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 460
 461         data->fan_min[nr] = FAN_TO_REG(min, val);
 462         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 463                          data->fan_min[nr]);
 464         mutex_unlock(&data->update_lock);
 465
 466         return count;
 467 }
 468
 469 #define set_fan(offset) \
 470 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 471                 size_t count) \
 472 { \
 473         set_fan_min(dev, buf, offset-1); \
 474         return count; \
 475 } \
 476 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 477                 size_t count) \
 478 { \
 479         return set_fan_div(dev, buf, count, offset-1); \
 480 } \
 481 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 482                 show_fan##offset##_min, set_fan##offset##_min); \
 483 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 484                 show_fan##offset##_div, set_fan##offset##_div);
 485 set_fan(1);
 486 set_fan(2);
 487
 488 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 489 {
 490         struct lm87_data *data = lm87_update_device(dev);
 491         return sprintf(buf, "%d\n", data->alarms);
 492 }
 493 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 494
 495 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 496 {
 497         struct lm87_data *data = lm87_update_device(dev);
 498         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 499 }
 500 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 501
 502 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 503 {
 504         struct lm87_data *data = dev_get_drvdata(dev);
 505         return sprintf(buf, "%d\n", data->vrm);
 506 }
 507 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 508 {
 509         struct i2c_client *client = to_i2c_client(dev);
 510         struct lm87_data *data = i2c_get_clientdata(client);
 511         data->vrm = simple_strtoul(buf, NULL, 10);
 512         return count;
 513 }
 514 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 515
 516 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 517 {
 518         struct lm87_data *data = lm87_update_device(dev);
 519         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 520 }
 521 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 522 {
 523         struct i2c_client *client = to_i2c_client(dev);
 524         struct lm87_data *data = i2c_get_clientdata(client);
 525         long val = simple_strtol(buf, NULL, 10);
 526
 527         mutex_lock(&data->update_lock);
 528         data->aout = AOUT_TO_REG(val);
 529         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 530         mutex_unlock(&data->update_lock);
 531         return count;
 532 }
 533 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 534
 535 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 536                           char *buf)
 537 {
 538         struct lm87_data *data = lm87_update_device(dev);
 539         int bitnr = to_sensor_dev_attr(attr)->index;
 540         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 541 }
 542 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 543 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 544 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 545 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 546 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 547 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 548 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 549 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 550 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 551 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 552 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 553 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 554 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 555 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 556 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 557
 558 /*
 559  * Real code
 560  */
 561
 562 static int lm87_attach_adapter(struct i2c_adapter *adapter)
 563 {
 564         if (!(adapter->class & I2C_CLASS_HWMON))
 565                 return 0;
 566         return i2c_probe(adapter, &addr_data, lm87_detect);
 567 }
 568
 569 static struct attribute *lm87_attributes[] = {
 570         &dev_attr_in1_input.attr,
 571         &dev_attr_in1_min.attr,
 572         &dev_attr_in1_max.attr,
 573         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 574         &dev_attr_in2_input.attr,
 575         &dev_attr_in2_min.attr,
 576         &dev_attr_in2_max.attr,
 577         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 578         &dev_attr_in3_input.attr,
 579         &dev_attr_in3_min.attr,
 580         &dev_attr_in3_max.attr,
 581         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 582         &dev_attr_in4_input.attr,
 583         &dev_attr_in4_min.attr,
 584         &dev_attr_in4_max.attr,
 585         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 586
 587         &dev_attr_temp1_input.attr,
 588         &dev_attr_temp1_max.attr,
 589         &dev_attr_temp1_min.attr,
 590         &dev_attr_temp1_crit.attr,
 591         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 592         &dev_attr_temp2_input.attr,
 593         &dev_attr_temp2_max.attr,
 594         &dev_attr_temp2_min.attr,
 595         &dev_attr_temp2_crit.attr,
 596         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 597         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 598
 599         &dev_attr_alarms.attr,
 600         &dev_attr_aout_output.attr,
 601
 602         NULL
 603 };
 604
 605 static const struct attribute_group lm87_group = {
 606         .attrs = lm87_attributes,
 607 };
 608
 609 static struct attribute *lm87_attributes_opt[] = {
 610         &dev_attr_in6_input.attr,
 611         &dev_attr_in6_min.attr,
 612         &dev_attr_in6_max.attr,
 613         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 614
 615         &dev_attr_fan1_input.attr,
 616         &dev_attr_fan1_min.attr,
 617         &dev_attr_fan1_div.attr,
 618         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 619
 620         &dev_attr_in7_input.attr,
 621         &dev_attr_in7_min.attr,
 622         &dev_attr_in7_max.attr,
 623         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 624
 625         &dev_attr_fan2_input.attr,
 626         &dev_attr_fan2_min.attr,
 627         &dev_attr_fan2_div.attr,
 628         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 629
 630         &dev_attr_temp3_input.attr,
 631         &dev_attr_temp3_max.attr,
 632         &dev_attr_temp3_min.attr,
 633         &dev_attr_temp3_crit.attr,
 634         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 635         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 636
 637         &dev_attr_in0_input.attr,
 638         &dev_attr_in0_min.attr,
 639         &dev_attr_in0_max.attr,
 640         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 641         &dev_attr_in5_input.attr,
 642         &dev_attr_in5_min.attr,
 643         &dev_attr_in5_max.attr,
 644         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 645
 646         &dev_attr_cpu0_vid.attr,
 647         &dev_attr_vrm.attr,
 648
 649         NULL
 650 };
 651
 652 static const struct attribute_group lm87_group_opt = {
 653         .attrs = lm87_attributes_opt,
 654 };
 655
 656 /*
 657  * The following function does more than just detection. If detection
 658  * succeeds, it also registers the new chip.
 659  */
 660 static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
 661 {
 662         struct i2c_client *new_client;
 663         struct lm87_data *data;
 664         int err = 0;
 665
 666         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 667                 goto exit;
 668
 669         if (!(data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL))) {
 670                 err = -ENOMEM;
 671                 goto exit;
 672         }
 673
 674         /* The common I2C client data is placed right before the
 675            LM87-specific data. */
 676         new_client = &data->client;
 677         i2c_set_clientdata(new_client, data);
 678         new_client->addr = address;
 679         new_client->adapter = adapter;
 680         new_client->driver = &lm87_driver;
 681         new_client->flags = 0;
 682
 683         /* Default to an LM87 if forced */
 684         if (kind == 0)
 685                 kind = lm87;
 686
 687         /* Now, we do the remaining detection. */
 688         if (kind < 0) {
 689                 u8 rev = lm87_read_value(new_client, LM87_REG_REVISION);
 690
 691                 if (rev < 0x01 || rev > 0x08
 692                  || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
 693                  || lm87_read_value(new_client, LM87_REG_COMPANY_ID) != 0x02) {
 694                         dev_dbg(&adapter->dev,
 695                                 "LM87 detection failed at 0x%02x.\n",
 696                                 address);
 697                         goto exit_free;
 698                 }
 699         }
 700
 701         /* We can fill in the remaining client fields */
 702         strlcpy(new_client->name, "lm87", I2C_NAME_SIZE);
 703         data->valid = 0;
 704         mutex_init(&data->update_lock);
 705
 706         /* Tell the I2C layer a new client has arrived */
 707         if ((err = i2c_attach_client(new_client)))
 708                 goto exit_free;
 709
 710         /* Initialize the LM87 chip */
 711         lm87_init_client(new_client);
 712
 713         data->in_scale[0] = 2500;
 714         data->in_scale[1] = 2700;
 715         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 716         data->in_scale[3] = 5000;
 717         data->in_scale[4] = 12000;
 718         data->in_scale[5] = 2700;
 719         data->in_scale[6] = 1875;
 720         data->in_scale[7] = 1875;
 721
 722         /* Register sysfs hooks */
 723         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
 724                 goto exit_detach;
 725
 726         if (data->channel & CHAN_NO_FAN(0)) {
 727                 if ((err = device_create_file(&new_client->dev,
 728                                         &dev_attr_in6_input))
 729                  || (err = device_create_file(&new_client->dev,
 730                                         &dev_attr_in6_min))
 731                  || (err = device_create_file(&new_client->dev,
 732                                         &dev_attr_in6_max))
 733                  || (err = device_create_file(&new_client->dev,
 734                                         &sensor_dev_attr_in6_alarm.dev_attr)))
 735                         goto exit_remove;
 736         } else {
 737                 if ((err = device_create_file(&new_client->dev,
 738                                         &dev_attr_fan1_input))
 739                  || (err = device_create_file(&new_client->dev,
 740                                         &dev_attr_fan1_min))
 741                  || (err = device_create_file(&new_client->dev,
 742                                         &dev_attr_fan1_div))
 743                  || (err = device_create_file(&new_client->dev,
 744                                         &sensor_dev_attr_fan1_alarm.dev_attr)))
 745                         goto exit_remove;
 746         }
 747
 748         if (data->channel & CHAN_NO_FAN(1)) {
 749                 if ((err = device_create_file(&new_client->dev,
 750                                         &dev_attr_in7_input))
 751                  || (err = device_create_file(&new_client->dev,
 752                                         &dev_attr_in7_min))
 753                  || (err = device_create_file(&new_client->dev,
 754                                         &dev_attr_in7_max))
 755                  || (err = device_create_file(&new_client->dev,
 756                                         &sensor_dev_attr_in7_alarm.dev_attr)))
 757                         goto exit_remove;
 758         } else {
 759                 if ((err = device_create_file(&new_client->dev,
 760                                         &dev_attr_fan2_input))
 761                  || (err = device_create_file(&new_client->dev,
 762                                         &dev_attr_fan2_min))
 763                  || (err = device_create_file(&new_client->dev,
 764                                         &dev_attr_fan2_div))
 765                  || (err = device_create_file(&new_client->dev,
 766                                         &sensor_dev_attr_fan2_alarm.dev_attr)))
 767                         goto exit_remove;
 768         }
 769
 770         if (data->channel & CHAN_TEMP3) {
 771                 if ((err = device_create_file(&new_client->dev,
 772                                         &dev_attr_temp3_input))
 773                  || (err = device_create_file(&new_client->dev,
 774                                         &dev_attr_temp3_max))
 775                  || (err = device_create_file(&new_client->dev,
 776                                         &dev_attr_temp3_min))
 777                  || (err = device_create_file(&new_client->dev,
 778                                         &dev_attr_temp3_crit))
 779                  || (err = device_create_file(&new_client->dev,
 780                                         &sensor_dev_attr_temp3_alarm.dev_attr))
 781                  || (err = device_create_file(&new_client->dev,
 782                                         &sensor_dev_attr_temp3_fault.dev_attr)))
 783                         goto exit_remove;
 784         } else {
 785                 if ((err = device_create_file(&new_client->dev,
 786                                         &dev_attr_in0_input))
 787                  || (err = device_create_file(&new_client->dev,
 788                                         &dev_attr_in0_min))
 789                  || (err = device_create_file(&new_client->dev,
 790                                         &dev_attr_in0_max))
 791                  || (err = device_create_file(&new_client->dev,
 792                                         &sensor_dev_attr_in0_alarm.dev_attr))
 793                  || (err = device_create_file(&new_client->dev,
 794                                         &dev_attr_in5_input))
 795                  || (err = device_create_file(&new_client->dev,
 796                                         &dev_attr_in5_min))
 797                  || (err = device_create_file(&new_client->dev,
 798                                         &dev_attr_in5_max))
 799                  || (err = device_create_file(&new_client->dev,
 800                                         &sensor_dev_attr_in5_alarm.dev_attr)))
 801                         goto exit_remove;
 802         }
 803
 804         if (!(data->channel & CHAN_NO_VID)) {
 805                 data->vrm = vid_which_vrm();
 806                 if ((err = device_create_file(&new_client->dev,
 807                                         &dev_attr_cpu0_vid))
 808                  || (err = device_create_file(&new_client->dev,
 809                                         &dev_attr_vrm)))
 810                         goto exit_remove;
 811         }
 812
 813         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 814         if (IS_ERR(data->hwmon_dev)) {
 815                 err = PTR_ERR(data->hwmon_dev);
 816                 goto exit_remove;
 817         }
 818
 819         return 0;
 820
 821 exit_remove:
 822         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
 823         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
 824 exit_detach:
 825         i2c_detach_client(new_client);
 826 exit_free:
 827         kfree(data);
 828 exit:
 829         return err;
 830 }
 831
 832 static void lm87_init_client(struct i2c_client *client)
 833 {
 834         struct lm87_data *data = i2c_get_clientdata(client);
 835         u8 config;
 836
 837         data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 838
 839         config = lm87_read_value(client, LM87_REG_CONFIG);
 840         if (!(config & 0x01)) {
 841                 int i;
 842
 843                 /* Limits are left uninitialized after power-up */
 844                 for (i = 1; i < 6; i++) {
 845                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 846                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 847                 }
 848                 for (i = 0; i < 2; i++) {
 849                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 850                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 851                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 852                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 853                 }
 854                 if (data->channel & CHAN_TEMP3) {
 855                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 856                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 857                 } else {
 858                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 859                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 860                 }
 861         }
 862         if ((config & 0x81) != 0x01) {
 863                 /* Start monitoring */
 864                 lm87_write_value(client, LM87_REG_CONFIG,
 865                                  (config & 0xF7) | 0x01);
 866         }
 867 }
 868
 869 static int lm87_detach_client(struct i2c_client *client)
 870 {
 871         struct lm87_data *data = i2c_get_clientdata(client);
 872         int err;
 873
 874         hwmon_device_unregister(data->hwmon_dev);
 875         sysfs_remove_group(&client->dev.kobj, &lm87_group);
 876         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
 877
 878         if ((err = i2c_detach_client(client)))
 879                 return err;
 880
 881         kfree(data);
 882         return 0;
 883 }
 884
 885 static struct lm87_data *lm87_update_device(struct device *dev)
 886 {
 887         struct i2c_client *client = to_i2c_client(dev);
 888         struct lm87_data *data = i2c_get_clientdata(client);
 889
 890         mutex_lock(&data->update_lock);
 891
 892         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 893                 int i, j;
 894
 895                 dev_dbg(&client->dev, "Updating data.\n");
 896
 897                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 898                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 899                 for (; i < j; i++) {
 900                         data->in[i] = lm87_read_value(client,
 901                                       LM87_REG_IN(i));
 902                         data->in_min[i] = lm87_read_value(client,
 903                                           LM87_REG_IN_MIN(i));
 904                         data->in_max[i] = lm87_read_value(client,
 905                                           LM87_REG_IN_MAX(i));
 906                 }
 907
 908                 for (i = 0; i < 2; i++) {
 909                         if (data->channel & CHAN_NO_FAN(i)) {
 910                                 data->in[6+i] = lm87_read_value(client,
 911                                                 LM87_REG_AIN(i));
 912                                 data->in_max[6+i] = lm87_read_value(client,
 913                                                     LM87_REG_AIN_MAX(i));
 914                                 data->in_min[6+i] = lm87_read_value(client,
 915                                                     LM87_REG_AIN_MIN(i));
 916
 917                         } else {
 918                                 data->fan[i] = lm87_read_value(client,
 919                                                LM87_REG_FAN(i));
 920                                 data->fan_min[i] = lm87_read_value(client,
 921                                                    LM87_REG_FAN_MIN(i));
 922                         }
 923                 }
 924
 925                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 926                 for (i = 0 ; i < j; i++) {
 927                         data->temp[i] = lm87_read_value(client,
 928                                         LM87_REG_TEMP[i]);
 929                         data->temp_high[i] = lm87_read_value(client,
 930                                              LM87_REG_TEMP_HIGH[i]);
 931                         data->temp_low[i] = lm87_read_value(client,
 932                                             LM87_REG_TEMP_LOW[i]);
 933                 }
 934
 935                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 936                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 937                 data->temp_crit_int = min(i, j);
 938
 939                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 940                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 941                 data->temp_crit_ext = min(i, j);
 942
 943                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 944                 data->fan_div[0] = (i >> 4) & 0x03;
 945                 data->fan_div[1] = (i >> 6) & 0x03;
 946                 data->vid = (i & 0x0F)
 947                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 948                              << 4;
 949
 950                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 951                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 952                                 << 8);
 953                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 954
 955                 data->last_updated = jiffies;
 956                 data->valid = 1;
 957         }
 958
 959         mutex_unlock(&data->update_lock);
 960
 961         return data;
 962 }
 963
 964 static int __init sensors_lm87_init(void)
 965 {
 966         return i2c_add_driver(&lm87_driver);
 967 }
 968
 969 static void __exit sensors_lm87_exit(void)
 970 {
 971         i2c_del_driver(&lm87_driver);
 972 }
 973
 974 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
 975 MODULE_DESCRIPTION("LM87 driver");
 976 MODULE_LICENSE("GPL");
 977
 978 module_init(sensors_lm87_init);
 979 module_exit(sensors_lm87_exit);