drivers/hwmon/amc6821.c

   1 /*
   2         amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
   3         monitoring
   4         Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
   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
  22 #include <linux/kernel.h>       /* Needed for KERN_INFO */
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/i2c.h>
  28 #include <linux/hwmon.h>
  29 #include <linux/hwmon-sysfs.h>
  30 #include <linux/err.h>
  31 #include <linux/mutex.h>
  32
  33
  34 /*
  35  * Addresses to scan.
  36  */
  37
  38 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
  39         0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
  40
  41
  42
  43 /*
  44  * Insmod parameters
  45  */
  46
  47 static int pwminv = 0;  /*Inverted PWM output. */
  48 module_param(pwminv, int, S_IRUGO);
  49
  50 static int init = 1; /*Power-on initialization.*/
  51 module_param(init, int, S_IRUGO);
  52
  53
  54 I2C_CLIENT_INSMOD_1(amc6821);
  55
  56 #define AMC6821_REG_DEV_ID 0x3D
  57 #define AMC6821_REG_COMP_ID 0x3E
  58 #define AMC6821_REG_CONF1 0x00
  59 #define AMC6821_REG_CONF2 0x01
  60 #define AMC6821_REG_CONF3 0x3F
  61 #define AMC6821_REG_CONF4 0x04
  62 #define AMC6821_REG_STAT1 0x02
  63 #define AMC6821_REG_STAT2 0x03
  64 #define AMC6821_REG_TDATA_LOW 0x08
  65 #define AMC6821_REG_TDATA_HI 0x09
  66 #define AMC6821_REG_LTEMP_HI 0x0A
  67 #define AMC6821_REG_RTEMP_HI 0x0B
  68 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
  69 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
  70 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
  71 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
  72 #define AMC6821_REG_LTEMP_CRIT 0x1B
  73 #define AMC6821_REG_RTEMP_CRIT 0x1D
  74 #define AMC6821_REG_PSV_TEMP 0x1C
  75 #define AMC6821_REG_DCY 0x22
  76 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24
  77 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25
  78 #define AMC6821_REG_DCY_LOW_TEMP 0x21
  79
  80 #define AMC6821_REG_TACH_LLIMITL 0x10
  81 #define AMC6821_REG_TACH_LLIMITH 0x11
  82 #define AMC6821_REG_TACH_HLIMITL 0x12
  83 #define AMC6821_REG_TACH_HLIMITH 0x13
  84
  85 #define AMC6821_CONF1_START 0x01
  86 #define AMC6821_CONF1_FAN_INT_EN 0x02
  87 #define AMC6821_CONF1_FANIE 0x04
  88 #define AMC6821_CONF1_PWMINV 0x08
  89 #define AMC6821_CONF1_FAN_FAULT_EN 0x10
  90 #define AMC6821_CONF1_FDRC0 0x20
  91 #define AMC6821_CONF1_FDRC1 0x40
  92 #define AMC6821_CONF1_THERMOVIE 0x80
  93
  94 #define AMC6821_CONF2_PWM_EN 0x01
  95 #define AMC6821_CONF2_TACH_MODE 0x02
  96 #define AMC6821_CONF2_TACH_EN 0x04
  97 #define AMC6821_CONF2_RTFIE 0x08
  98 #define AMC6821_CONF2_LTOIE 0x10
  99 #define AMC6821_CONF2_RTOIE 0x20
 100 #define AMC6821_CONF2_PSVIE 0x40
 101 #define AMC6821_CONF2_RST 0x80
 102
 103 #define AMC6821_CONF3_THERM_FAN_EN 0x80
 104 #define AMC6821_CONF3_REV_MASK 0x0F
 105
 106 #define AMC6821_CONF4_OVREN 0x10
 107 #define AMC6821_CONF4_TACH_FAST 0x20
 108 #define AMC6821_CONF4_PSPR 0x40
 109 #define AMC6821_CONF4_MODE 0x80
 110
 111 #define AMC6821_STAT1_RPM_ALARM 0x01
 112 #define AMC6821_STAT1_FANS 0x02
 113 #define AMC6821_STAT1_RTH 0x04
 114 #define AMC6821_STAT1_RTL 0x08
 115 #define AMC6821_STAT1_R_THERM 0x10
 116 #define AMC6821_STAT1_RTF 0x20
 117 #define AMC6821_STAT1_LTH 0x40
 118 #define AMC6821_STAT1_LTL 0x80
 119
 120 #define AMC6821_STAT2_RTC 0x08
 121 #define AMC6821_STAT2_LTC 0x10
 122 #define AMC6821_STAT2_LPSV 0x20
 123 #define AMC6821_STAT2_L_THERM 0x40
 124 #define AMC6821_STAT2_THERM_IN 0x80
 125
 126 enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
 127         IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
 128         IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
 129         TEMP_IDX_LEN, };
 130
 131 static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
 132                         AMC6821_REG_LTEMP_LIMIT_MIN,
 133                         AMC6821_REG_LTEMP_LIMIT_MAX,
 134                         AMC6821_REG_LTEMP_CRIT,
 135                         AMC6821_REG_RTEMP_HI,
 136                         AMC6821_REG_RTEMP_LIMIT_MIN,
 137                         AMC6821_REG_RTEMP_LIMIT_MAX,
 138                         AMC6821_REG_RTEMP_CRIT, };
 139
 140 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
 141         FAN1_IDX_LEN, };
 142
 143 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
 144                         AMC6821_REG_TACH_LLIMITL,
 145                         AMC6821_REG_TACH_HLIMITL, };
 146
 147
 148 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
 149                         AMC6821_REG_TACH_LLIMITH,
 150                         AMC6821_REG_TACH_HLIMITH, };
 151
 152 static int amc6821_probe(
 153                 struct i2c_client *client,
 154                 const struct i2c_device_id *id);
 155 static int amc6821_detect(
 156                 struct i2c_client *client,
 157                 int kind,
 158                 struct i2c_board_info *info);
 159 static int amc6821_init_client(struct i2c_client *client);
 160 static int amc6821_remove(struct i2c_client *client);
 161 static struct amc6821_data *amc6821_update_device(struct device *dev);
 162
 163 /*
 164  * Driver data (common to all clients)
 165  */
 166
 167 static const struct i2c_device_id amc6821_id[] = {
 168         { "amc6821", amc6821 },
 169         { }
 170 };
 171
 172 MODULE_DEVICE_TABLE(i2c, amc6821_id);
 173
 174 static struct i2c_driver amc6821_driver = {
 175         .class = I2C_CLASS_HWMON,
 176         .driver = {
 177                 .name   = "amc6821",
 178         },
 179         .probe = amc6821_probe,
 180         .remove = amc6821_remove,
 181         .id_table = amc6821_id,
 182         .detect = amc6821_detect,
 183         .address_data = &addr_data,
 184 };
 185
 186
 187 /*
 188  * Client data (each client gets its own)
 189   */
 190
 191 struct amc6821_data {
 192         struct device *hwmon_dev;
 193         struct mutex update_lock;
 194         char valid; /* zero until following fields are valid */
 195         unsigned long last_updated; /* in jiffies */
 196
 197         /* register values */
 198         int temp[TEMP_IDX_LEN];
 199
 200         u16 fan[FAN1_IDX_LEN];
 201         u8 fan1_div;
 202
 203         u8 pwm1;
 204         u8 temp1_auto_point_temp[3];
 205         u8 temp2_auto_point_temp[3];
 206         u8 pwm1_auto_point_pwm[3];
 207         u8 pwm1_enable;
 208         u8 pwm1_auto_channels_temp;
 209
 210         u8 stat1;
 211         u8 stat2;
 212 };
 213
 214
 215 static ssize_t get_temp(
 216                 struct device *dev,
 217                 struct device_attribute *devattr,
 218                 char *buf)
 219 {
 220         struct amc6821_data *data = amc6821_update_device(dev);
 221         int ix = to_sensor_dev_attr(devattr)->index;
 222
 223         return sprintf(buf, "%d\n", data->temp[ix] * 1000);
 224 }
 225
 226
 227
 228 static ssize_t set_temp(
 229                 struct device *dev,
 230                 struct device_attribute *attr,
 231                 const char *buf,
 232                 size_t count)
 233 {
 234         struct i2c_client *client = to_i2c_client(dev);
 235         struct amc6821_data *data = i2c_get_clientdata(client);
 236         int ix = to_sensor_dev_attr(attr)->index;
 237         long val;
 238
 239         int ret = strict_strtol(buf, 10, &val);
 240         if (ret)
 241                 return ret;
 242         val = SENSORS_LIMIT(val / 1000, -128, 127);
 243
 244         mutex_lock(&data->update_lock);
 245         data->temp[ix] = val;
 246         if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
 247                 dev_err(&client->dev, "Register write error, aborting.\n");
 248                 count = -EIO;
 249         }
 250         mutex_unlock(&data->update_lock);
 251         return count;
 252 }
 253
 254
 255
 256
 257 static ssize_t get_temp_alarm(
 258         struct device *dev,
 259         struct device_attribute *devattr,
 260         char *buf)
 261 {
 262         struct amc6821_data *data = amc6821_update_device(dev);
 263         int ix = to_sensor_dev_attr(devattr)->index;
 264         u8 flag;
 265
 266         switch (ix) {
 267         case IDX_TEMP1_MIN:
 268                 flag = data->stat1 & AMC6821_STAT1_LTL;
 269                 break;
 270         case IDX_TEMP1_MAX:
 271                 flag = data->stat1 & AMC6821_STAT1_LTH;
 272                 break;
 273         case IDX_TEMP1_CRIT:
 274                 flag = data->stat2 & AMC6821_STAT2_LTC;
 275                 break;
 276         case IDX_TEMP2_MIN:
 277                 flag = data->stat1 & AMC6821_STAT1_RTL;
 278                 break;
 279         case IDX_TEMP2_MAX:
 280                 flag = data->stat1 & AMC6821_STAT1_RTH;
 281                 break;
 282         case IDX_TEMP2_CRIT:
 283                 flag = data->stat2 & AMC6821_STAT2_RTC;
 284                 break;
 285         default:
 286                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 287                 return -EINVAL;
 288         }
 289         if (flag)
 290                 return sprintf(buf, "1");
 291         else
 292                 return sprintf(buf, "0");
 293 }
 294
 295
 296
 297
 298 static ssize_t get_temp2_fault(
 299                 struct device *dev,
 300                 struct device_attribute *devattr,
 301                 char *buf)
 302 {
 303         struct amc6821_data *data = amc6821_update_device(dev);
 304         if (data->stat1 & AMC6821_STAT1_RTF)
 305                 return sprintf(buf, "1");
 306         else
 307                 return sprintf(buf, "0");
 308 }
 309
 310 static ssize_t get_pwm1(
 311                 struct device *dev,
 312                 struct device_attribute *devattr,
 313                 char *buf)
 314 {
 315         struct amc6821_data *data = amc6821_update_device(dev);
 316         return sprintf(buf, "%d\n", data->pwm1);
 317 }
 318
 319 static ssize_t set_pwm1(
 320                 struct device *dev,
 321                 struct device_attribute *devattr,
 322                 const char *buf,
 323                 size_t count)
 324 {
 325         struct i2c_client *client = to_i2c_client(dev);
 326         struct amc6821_data *data = i2c_get_clientdata(client);
 327         long val;
 328         int ret = strict_strtol(buf, 10, &val);
 329         if (ret)
 330                 return ret;
 331
 332         mutex_lock(&data->update_lock);
 333         data->pwm1 = SENSORS_LIMIT(val , 0, 255);
 334         i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
 335         mutex_unlock(&data->update_lock);
 336         return count;
 337 }
 338
 339 static ssize_t get_pwm1_enable(
 340                 struct device *dev,
 341                 struct device_attribute *devattr,
 342                 char *buf)
 343 {
 344         struct amc6821_data *data = amc6821_update_device(dev);
 345         return sprintf(buf, "%d\n", data->pwm1_enable);
 346 }
 347
 348 static ssize_t set_pwm1_enable(
 349                 struct device *dev,
 350                 struct device_attribute *attr,
 351                 const char *buf,
 352                 size_t count)
 353 {
 354         struct i2c_client *client = to_i2c_client(dev);
 355         struct amc6821_data *data = i2c_get_clientdata(client);
 356         long val;
 357         int config = strict_strtol(buf, 10, &val);
 358         if (config)
 359                 return config;
 360
 361         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 362         if (config < 0) {
 363                         dev_err(&client->dev,
 364                         "Error reading configuration register, aborting.\n");
 365                         return -EIO;
 366         }
 367
 368         switch (val) {
 369         case 1:
 370                 config &= ~AMC6821_CONF1_FDRC0;
 371                 config &= ~AMC6821_CONF1_FDRC1;
 372                 break;
 373         case 2:
 374                 config &= ~AMC6821_CONF1_FDRC0;
 375                 config |= AMC6821_CONF1_FDRC1;
 376                 break;
 377         case 3:
 378                 config |= AMC6821_CONF1_FDRC0;
 379                 config |= AMC6821_CONF1_FDRC1;
 380                 break;
 381         default:
 382                 return -EINVAL;
 383         }
 384         mutex_lock(&data->update_lock);
 385         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
 386                         dev_err(&client->dev,
 387                         "Configuration register write error, aborting.\n");
 388                         count = -EIO;
 389         }
 390         mutex_unlock(&data->update_lock);
 391         return count;
 392 }
 393
 394
 395 static ssize_t get_pwm1_auto_channels_temp(
 396                 struct device *dev,
 397                 struct device_attribute *devattr,
 398                 char *buf)
 399 {
 400         struct amc6821_data *data = amc6821_update_device(dev);
 401         return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
 402 }
 403
 404
 405 static ssize_t get_temp_auto_point_temp(
 406                 struct device *dev,
 407                 struct device_attribute *devattr,
 408                 char *buf)
 409 {
 410         int ix = to_sensor_dev_attr_2(devattr)->index;
 411         int nr = to_sensor_dev_attr_2(devattr)->nr;
 412         struct amc6821_data *data = amc6821_update_device(dev);
 413         switch (nr) {
 414         case 1:
 415                 return sprintf(buf, "%d\n",
 416                         data->temp1_auto_point_temp[ix] * 1000);
 417                 break;
 418         case 2:
 419                 return sprintf(buf, "%d\n",
 420                         data->temp2_auto_point_temp[ix] * 1000);
 421                 break;
 422         default:
 423                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 424                 return -EINVAL;
 425         }
 426 }
 427
 428
 429 static ssize_t get_pwm1_auto_point_pwm(
 430                 struct device *dev,
 431                 struct device_attribute *devattr,
 432                 char *buf)
 433 {
 434         int ix = to_sensor_dev_attr(devattr)->index;
 435         struct amc6821_data *data = amc6821_update_device(dev);
 436         return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
 437 }
 438
 439
 440 static inline ssize_t set_slope_register(struct i2c_client *client,
 441                 u8 reg,
 442                 u8 dpwm,
 443                 u8 *ptemp)
 444 {
 445         int dt;
 446         u8 tmp;
 447
 448         dt = ptemp[2]-ptemp[1];
 449         for (tmp = 4; tmp > 0; tmp--) {
 450                 if (dt * (0x20 >> tmp) >= dpwm)
 451                         break;
 452         }
 453         tmp |= (ptemp[1] & 0x7C) << 1;
 454         if (i2c_smbus_write_byte_data(client,
 455                         reg, tmp)) {
 456                 dev_err(&client->dev, "Register write error, aborting.\n");
 457                 return -EIO;
 458         }
 459         return 0;
 460 }
 461
 462
 463
 464 static ssize_t set_temp_auto_point_temp(
 465                 struct device *dev,
 466                 struct device_attribute *attr,
 467                 const char *buf,
 468                 size_t count)
 469 {
 470         struct i2c_client *client = to_i2c_client(dev);
 471         struct amc6821_data *data = amc6821_update_device(dev);
 472         int ix = to_sensor_dev_attr_2(attr)->index;
 473         int nr = to_sensor_dev_attr_2(attr)->nr;
 474         u8 *ptemp;
 475         u8 reg;
 476         int dpwm;
 477         long val;
 478         int ret = strict_strtol(buf, 10, &val);
 479         if (ret)
 480                 return ret;
 481
 482         switch (nr) {
 483         case 1:
 484                 ptemp = data->temp1_auto_point_temp;
 485                 reg = AMC6821_REG_LTEMP_FAN_CTRL;
 486                 break;
 487         case 2:
 488                 ptemp = data->temp2_auto_point_temp;
 489                 reg = AMC6821_REG_RTEMP_FAN_CTRL;
 490                 break;
 491         default:
 492                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 493                 return -EINVAL;
 494         }
 495
 496         data->valid = 0;
 497         mutex_lock(&data->update_lock);
 498         switch (ix) {
 499         case 0:
 500                 ptemp[0] = SENSORS_LIMIT(val / 1000, 0,
 501                                 data->temp1_auto_point_temp[1]);
 502                 ptemp[0] = SENSORS_LIMIT(ptemp[0], 0,
 503                                 data->temp2_auto_point_temp[1]);
 504                 ptemp[0] = SENSORS_LIMIT(ptemp[0], 0, 63);
 505                 if (i2c_smbus_write_byte_data(
 506                                         client,
 507                                         AMC6821_REG_PSV_TEMP,
 508                                         ptemp[0])) {
 509                                 dev_err(&client->dev,
 510                                         "Register write error, aborting.\n");
 511                                 count = -EIO;
 512                 }
 513                 goto EXIT;
 514                 break;
 515         case 1:
 516                 ptemp[1] = SENSORS_LIMIT(
 517                                         val / 1000,
 518                                         (ptemp[0] & 0x7C) + 4,
 519                                         124);
 520                 ptemp[1] &= 0x7C;
 521                 ptemp[2] = SENSORS_LIMIT(
 522                                         ptemp[2], ptemp[1] + 1,
 523                                         255);
 524                 break;
 525         case 2:
 526                 ptemp[2] = SENSORS_LIMIT(
 527                                         val / 1000,
 528                                         ptemp[1]+1,
 529                                         255);
 530                 break;
 531         default:
 532                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 533                 count = -EINVAL;
 534                 goto EXIT;
 535         }
 536         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 537         if (set_slope_register(client, reg, dpwm, ptemp))
 538                 count = -EIO;
 539
 540 EXIT:
 541         mutex_unlock(&data->update_lock);
 542         return count;
 543 }
 544
 545
 546
 547 static ssize_t set_pwm1_auto_point_pwm(
 548                 struct device *dev,
 549                 struct device_attribute *attr,
 550                 const char *buf,
 551                 size_t count)
 552 {
 553         struct i2c_client *client = to_i2c_client(dev);
 554         struct amc6821_data *data = i2c_get_clientdata(client);
 555         int dpwm;
 556         long val;
 557         int ret = strict_strtol(buf, 10, &val);
 558         if (ret)
 559                 return ret;
 560
 561         mutex_lock(&data->update_lock);
 562         data->pwm1_auto_point_pwm[1] = SENSORS_LIMIT(val, 0, 254);
 563         if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
 564                         data->pwm1_auto_point_pwm[1])) {
 565                 dev_err(&client->dev, "Register write error, aborting.\n");
 566                 count = -EIO;
 567                 goto EXIT;
 568         }
 569         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 570         if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
 571                         data->temp1_auto_point_temp)) {
 572                 count = -EIO;
 573                 goto EXIT;
 574         }
 575         if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
 576                         data->temp2_auto_point_temp)) {
 577                 count = -EIO;
 578                 goto EXIT;
 579         }
 580
 581 EXIT:
 582         data->valid = 0;
 583         mutex_unlock(&data->update_lock);
 584         return count;
 585 }
 586
 587 static ssize_t get_fan(
 588                 struct device *dev,
 589                 struct device_attribute *devattr,
 590                 char *buf)
 591 {
 592         struct amc6821_data *data = amc6821_update_device(dev);
 593         int ix = to_sensor_dev_attr(devattr)->index;
 594         if (0 == data->fan[ix])
 595                 return sprintf(buf, "0");
 596         return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
 597 }
 598
 599
 600
 601 static ssize_t get_fan1_fault(
 602                 struct device *dev,
 603                 struct device_attribute *devattr,
 604                 char *buf)
 605 {
 606         struct amc6821_data *data = amc6821_update_device(dev);
 607         if (data->stat1 & AMC6821_STAT1_FANS)
 608                 return sprintf(buf, "1");
 609         else
 610                 return sprintf(buf, "0");
 611 }
 612
 613
 614
 615 static ssize_t set_fan(
 616                 struct device *dev,
 617                 struct device_attribute *attr,
 618                 const char *buf, size_t count)
 619 {
 620         struct i2c_client *client = to_i2c_client(dev);
 621         struct amc6821_data *data = i2c_get_clientdata(client);
 622         long val;
 623         int ix = to_sensor_dev_attr(attr)->index;
 624         int ret = strict_strtol(buf, 10, &val);
 625         if (ret)
 626                 return ret;
 627         val = 1 > val ? 0xFFFF : 6000000/val;
 628
 629         mutex_lock(&data->update_lock);
 630         data->fan[ix] = (u16) SENSORS_LIMIT(val, 1, 0xFFFF);
 631         if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
 632                         data->fan[ix] & 0xFF)) {
 633                 dev_err(&client->dev, "Register write error, aborting.\n");
 634                 count = -EIO;
 635                 goto EXIT;
 636         }
 637         if (i2c_smbus_write_byte_data(client,
 638                         fan_reg_hi[ix], data->fan[ix] >> 8)) {
 639                 dev_err(&client->dev, "Register write error, aborting.\n");
 640                 count = -EIO;
 641         }
 642 EXIT:
 643         mutex_unlock(&data->update_lock);
 644         return count;
 645 }
 646
 647
 648
 649 static ssize_t get_fan1_div(
 650                 struct device *dev,
 651                 struct device_attribute *devattr,
 652                 char *buf)
 653 {
 654         struct amc6821_data *data = amc6821_update_device(dev);
 655         return sprintf(buf, "%d\n", data->fan1_div);
 656 }
 657
 658 static ssize_t set_fan1_div(
 659                 struct device *dev,
 660                 struct device_attribute *attr,
 661                 const char *buf, size_t count)
 662 {
 663         struct i2c_client *client = to_i2c_client(dev);
 664         struct amc6821_data *data = i2c_get_clientdata(client);
 665         long val;
 666         int config = strict_strtol(buf, 10, &val);
 667         if (config)
 668                 return config;
 669
 670         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 671         if (config < 0) {
 672                 dev_err(&client->dev,
 673                         "Error reading configuration register, aborting.\n");
 674                 return -EIO;
 675         }
 676         mutex_lock(&data->update_lock);
 677         switch (val) {
 678         case 2:
 679                 config &= ~AMC6821_CONF4_PSPR;
 680                 data->fan1_div = 2;
 681                 break;
 682         case 4:
 683                 config |= AMC6821_CONF4_PSPR;
 684                 data->fan1_div = 4;
 685                 break;
 686         default:
 687                 mutex_unlock(&data->update_lock);
 688                 count = -EINVAL;
 689                 goto EXIT;
 690         }
 691         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
 692                 dev_err(&client->dev,
 693                         "Configuration register write error, aborting.\n");
 694                 count = -EIO;
 695         }
 696 EXIT:
 697         mutex_unlock(&data->update_lock);
 698         return count;
 699 }
 700
 701
 702
 703 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 704         get_temp, NULL, IDX_TEMP1_INPUT);
 705 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
 706         set_temp, IDX_TEMP1_MIN);
 707 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
 708         set_temp, IDX_TEMP1_MAX);
 709 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
 710         set_temp, IDX_TEMP1_CRIT);
 711 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
 712         get_temp_alarm, NULL, IDX_TEMP1_MIN);
 713 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
 714         get_temp_alarm, NULL, IDX_TEMP1_MAX);
 715 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
 716         get_temp_alarm, NULL, IDX_TEMP1_CRIT);
 717 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
 718         get_temp, NULL, IDX_TEMP2_INPUT);
 719 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
 720         set_temp, IDX_TEMP2_MIN);
 721 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
 722         set_temp, IDX_TEMP2_MAX);
 723 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
 724         set_temp, IDX_TEMP2_CRIT);
 725 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
 726         get_temp2_fault, NULL, 0);
 727 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
 728         get_temp_alarm, NULL, IDX_TEMP2_MIN);
 729 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
 730         get_temp_alarm, NULL, IDX_TEMP2_MAX);
 731 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
 732         get_temp_alarm, NULL, IDX_TEMP2_CRIT);
 733 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
 734 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 735         get_fan, set_fan, IDX_FAN1_MIN);
 736 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
 737         get_fan, set_fan, IDX_FAN1_MAX);
 738 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
 739 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 740         get_fan1_div, set_fan1_div, 0);
 741
 742 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
 743 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
 744         get_pwm1_enable, set_pwm1_enable, 0);
 745 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
 746         get_pwm1_auto_point_pwm, NULL, 0);
 747 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
 748         get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
 749 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
 750         get_pwm1_auto_point_pwm, NULL, 2);
 751 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
 752         get_pwm1_auto_channels_temp, NULL, 0);
 753 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
 754         get_temp_auto_point_temp, NULL, 1, 0);
 755 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
 756         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
 757 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
 758         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
 759
 760 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
 761         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
 762 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
 763         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
 764 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
 765         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
 766
 767
 768
 769 static struct attribute *amc6821_attrs[] = {
 770         &sensor_dev_attr_temp1_input.dev_attr.attr,
 771         &sensor_dev_attr_temp1_min.dev_attr.attr,
 772         &sensor_dev_attr_temp1_max.dev_attr.attr,
 773         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 774         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 775         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 776         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 777         &sensor_dev_attr_temp2_input.dev_attr.attr,
 778         &sensor_dev_attr_temp2_min.dev_attr.attr,
 779         &sensor_dev_attr_temp2_max.dev_attr.attr,
 780         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 781         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 782         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 783         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 784         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 785         &sensor_dev_attr_fan1_input.dev_attr.attr,
 786         &sensor_dev_attr_fan1_min.dev_attr.attr,
 787         &sensor_dev_attr_fan1_max.dev_attr.attr,
 788         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 789         &sensor_dev_attr_fan1_div.dev_attr.attr,
 790         &sensor_dev_attr_pwm1.dev_attr.attr,
 791         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 792         &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
 793         &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
 794         &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
 795         &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
 796         &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
 797         &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
 798         &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
 799         &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
 800         &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
 801         &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
 802         NULL
 803 };
 804
 805 static struct attribute_group amc6821_attr_grp = {
 806         .attrs = amc6821_attrs,
 807 };
 808
 809
 810
 811 /* Return 0 if detection is successful, -ENODEV otherwise */
 812 static int amc6821_detect(
 813                 struct i2c_client *client,
 814                 int kind,
 815                 struct i2c_board_info *info)
 816 {
 817         struct i2c_adapter *adapter = client->adapter;
 818         int address = client->addr;
 819
 820         dev_dbg(&adapter->dev, "amc6821_detect called, kind = %d.\n", kind);
 821
 822         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 823                 dev_dbg(&adapter->dev,
 824                 "max6650: I2C bus doesn't support byte read mode, skipping.\n");
 825                 return -ENODEV;
 826         }
 827         if ((kind < 0) &&
 828                 ((i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID) &
 829                         0xDE) ||
 830                 (i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID) &
 831                         0xB6))) {
 832                         dev_dbg(&adapter->dev,
 833                                 "amc6821: detection failed at 0x%02x.\n",
 834                                 address);
 835                 return -ENODEV;
 836         }
 837
 838         dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
 839         strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
 840
 841         return 0;
 842 }
 843
 844 static int amc6821_probe(
 845         struct i2c_client *client,
 846         const struct i2c_device_id *id)
 847 {
 848         struct amc6821_data *data;
 849         int err;
 850
 851         data = kzalloc(sizeof(struct amc6821_data), GFP_KERNEL);
 852         if (!data) {
 853                 dev_err(&client->dev, "out of memory.\n");
 854                 return -ENOMEM;
 855         }
 856
 857
 858         i2c_set_clientdata(client, data);
 859         mutex_init(&data->update_lock);
 860
 861         /*
 862          * Initialize the amc6821 chip
 863          */
 864         err = amc6821_init_client(client);
 865         if (err)
 866                 goto err_free;
 867
 868         err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
 869         if (err)
 870                 goto err_free;
 871
 872         data->hwmon_dev = hwmon_device_register(&client->dev);
 873         if (!IS_ERR(data->hwmon_dev))
 874                 return 0;
 875
 876         err = PTR_ERR(data->hwmon_dev);
 877         dev_err(&client->dev, "error registering hwmon device.\n");
 878         sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
 879 err_free:
 880         kfree(data);
 881         return err;
 882 }
 883
 884 static int amc6821_remove(struct i2c_client *client)
 885 {
 886         struct amc6821_data *data = i2c_get_clientdata(client);
 887
 888         hwmon_device_unregister(data->hwmon_dev);
 889         sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
 890
 891         kfree(data);
 892
 893         return 0;
 894 }
 895
 896
 897 static int amc6821_init_client(struct i2c_client *client)
 898 {
 899         int config;
 900         int err = -EIO;
 901
 902         if (init) {
 903                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 904
 905                 if (config < 0) {
 906                                 dev_err(&client->dev,
 907                         "Error reading configuration register, aborting.\n");
 908                                 return err;
 909                 }
 910
 911                 config |= AMC6821_CONF4_MODE;
 912
 913                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
 914                                 config)) {
 915                         dev_err(&client->dev,
 916                         "Configuration register write error, aborting.\n");
 917                         return err;
 918                 }
 919
 920                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
 921
 922                 if (config < 0) {
 923                         dev_err(&client->dev,
 924                         "Error reading configuration register, aborting.\n");
 925                         return err;
 926                 }
 927
 928                 config &= ~AMC6821_CONF3_THERM_FAN_EN;
 929
 930                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
 931                                 config)) {
 932                         dev_err(&client->dev,
 933                         "Configuration register write error, aborting.\n");
 934                         return err;
 935                 }
 936
 937                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
 938
 939                 if (config < 0) {
 940                         dev_err(&client->dev,
 941                         "Error reading configuration register, aborting.\n");
 942                         return err;
 943                 }
 944
 945                 config &= ~AMC6821_CONF2_RTFIE;
 946                 config &= ~AMC6821_CONF2_LTOIE;
 947                 config &= ~AMC6821_CONF2_RTOIE;
 948                 if (i2c_smbus_write_byte_data(client,
 949                                 AMC6821_REG_CONF2, config)) {
 950                         dev_err(&client->dev,
 951                         "Configuration register write error, aborting.\n");
 952                         return err;
 953                 }
 954
 955                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 956
 957                 if (config < 0) {
 958                         dev_err(&client->dev,
 959                         "Error reading configuration register, aborting.\n");
 960                         return err;
 961                 }
 962
 963                 config &= ~AMC6821_CONF1_THERMOVIE;
 964                 config &= ~AMC6821_CONF1_FANIE;
 965                 config |= AMC6821_CONF1_START;
 966                 if (pwminv)
 967                         config |= AMC6821_CONF1_PWMINV;
 968                 else
 969                         config &= ~AMC6821_CONF1_PWMINV;
 970
 971                 if (i2c_smbus_write_byte_data(
 972                                 client, AMC6821_REG_CONF1, config)) {
 973                         dev_err(&client->dev,
 974                         "Configuration register write error, aborting.\n");
 975                         return err;
 976                 }
 977         }
 978         return 0;
 979 }
 980
 981
 982 static struct amc6821_data *amc6821_update_device(struct device *dev)
 983 {
 984         struct i2c_client *client = to_i2c_client(dev);
 985         struct amc6821_data *data = i2c_get_clientdata(client);
 986         int timeout = HZ;
 987         u8 reg;
 988         int i;
 989
 990         mutex_lock(&data->update_lock);
 991
 992         if (time_after(jiffies, data->last_updated + timeout) ||
 993                         !data->valid) {
 994
 995                 for (i = 0; i < TEMP_IDX_LEN; i++)
 996                         data->temp[i] = i2c_smbus_read_byte_data(client,
 997                                 temp_reg[i]);
 998
 999                 data->stat1 = i2c_smbus_read_byte_data(client,
1000                         AMC6821_REG_STAT1);
1001                 data->stat2 = i2c_smbus_read_byte_data(client,
1002                         AMC6821_REG_STAT2);
1003
1004                 data->pwm1 = i2c_smbus_read_byte_data(client,
1005                         AMC6821_REG_DCY);
1006                 for (i = 0; i < FAN1_IDX_LEN; i++) {
1007                         data->fan[i] = i2c_smbus_read_byte_data(
1008                                         client,
1009                                         fan_reg_low[i]);
1010                         data->fan[i] += i2c_smbus_read_byte_data(
1011                                         client,
1012                                         fan_reg_hi[i]) << 8;
1013                 }
1014                 data->fan1_div = i2c_smbus_read_byte_data(client,
1015                         AMC6821_REG_CONF4);
1016                 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1017
1018                 data->pwm1_auto_point_pwm[0] = 0;
1019                 data->pwm1_auto_point_pwm[2] = 255;
1020                 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1021                         AMC6821_REG_DCY_LOW_TEMP);
1022
1023                 data->temp1_auto_point_temp[0] =
1024                         i2c_smbus_read_byte_data(client,
1025                                         AMC6821_REG_PSV_TEMP);
1026                 data->temp2_auto_point_temp[0] =
1027                                 data->temp1_auto_point_temp[0];
1028                 reg = i2c_smbus_read_byte_data(client,
1029                         AMC6821_REG_LTEMP_FAN_CTRL);
1030                 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1031                 reg &= 0x07;
1032                 reg = 0x20 >> reg;
1033                 if (reg > 0)
1034                         data->temp1_auto_point_temp[2] =
1035                                 data->temp1_auto_point_temp[1] +
1036                                 (data->pwm1_auto_point_pwm[2] -
1037                                 data->pwm1_auto_point_pwm[1]) / reg;
1038                 else
1039                         data->temp1_auto_point_temp[2] = 255;
1040
1041                 reg = i2c_smbus_read_byte_data(client,
1042                         AMC6821_REG_RTEMP_FAN_CTRL);
1043                 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1044                 reg &= 0x07;
1045                 reg = 0x20 >> reg;
1046                 if (reg > 0)
1047                         data->temp2_auto_point_temp[2] =
1048                                 data->temp2_auto_point_temp[1] +
1049                                 (data->pwm1_auto_point_pwm[2] -
1050                                 data->pwm1_auto_point_pwm[1]) / reg;
1051                 else
1052                         data->temp2_auto_point_temp[2] = 255;
1053
1054                 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1055                 reg = (reg >> 5) & 0x3;
1056                 switch (reg) {
1057                 case 0: /*open loop: software sets pwm1*/
1058                         data->pwm1_auto_channels_temp = 0;
1059                         data->pwm1_enable = 1;
1060                         break;
1061                 case 2: /*closed loop: remote T (temp2)*/
1062                         data->pwm1_auto_channels_temp = 2;
1063                         data->pwm1_enable = 2;
1064                         break;
1065                 case 3: /*closed loop: local and remote T (temp2)*/
1066                         data->pwm1_auto_channels_temp = 3;
1067                         data->pwm1_enable = 3;
1068                         break;
1069                 case 1: /*semi-open loop: software sets rpm, chip controls pwm1,
1070                           *currently not implemented
1071                           */
1072                         data->pwm1_auto_channels_temp = 0;
1073                         data->pwm1_enable = 0;
1074                         break;
1075                 }
1076
1077                 data->last_updated = jiffies;
1078                 data->valid = 1;
1079         }
1080         mutex_unlock(&data->update_lock);
1081         return data;
1082 }
1083
1084
1085 static int __init amc6821_init(void)
1086 {
1087         return i2c_add_driver(&amc6821_driver);
1088 }
1089
1090 static void __exit amc6821_exit(void)
1091 {
1092         i2c_del_driver(&amc6821_driver);
1093 }
1094
1095 module_init(amc6821_init);
1096 module_exit(amc6821_exit);
1097
1098
1099 MODULE_LICENSE("GPL");
1100 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1101 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
1102 MODULE_SUPPORTED_DEVICE("amc6821");