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  * Based on max6650.c:
   7  * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24
  25 #include <linux/kernel.h>       /* Needed for KERN_INFO */
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/i2c.h>
  31 #include <linux/hwmon.h>
  32 #include <linux/hwmon-sysfs.h>
  33 #include <linux/err.h>
  34 #include <linux/mutex.h>
  35
  36
  37 /*
  38  * Addresses to scan.
  39  */
  40
  41 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
  42         0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
  43
  44
  45
  46 /*
  47  * Insmod parameters
  48  */
  49
  50 static int pwminv;      /*Inverted PWM output. */
  51 module_param(pwminv, int, S_IRUGO);
  52
  53 static int init = 1; /*Power-on initialization.*/
  54 module_param(init, int, S_IRUGO);
  55
  56
  57 enum chips { amc6821 };
  58
  59 #define AMC6821_REG_DEV_ID 0x3D
  60 #define AMC6821_REG_COMP_ID 0x3E
  61 #define AMC6821_REG_CONF1 0x00
  62 #define AMC6821_REG_CONF2 0x01
  63 #define AMC6821_REG_CONF3 0x3F
  64 #define AMC6821_REG_CONF4 0x04
  65 #define AMC6821_REG_STAT1 0x02
  66 #define AMC6821_REG_STAT2 0x03
  67 #define AMC6821_REG_TDATA_LOW 0x08
  68 #define AMC6821_REG_TDATA_HI 0x09
  69 #define AMC6821_REG_LTEMP_HI 0x0A
  70 #define AMC6821_REG_RTEMP_HI 0x0B
  71 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
  72 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
  73 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
  74 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
  75 #define AMC6821_REG_LTEMP_CRIT 0x1B
  76 #define AMC6821_REG_RTEMP_CRIT 0x1D
  77 #define AMC6821_REG_PSV_TEMP 0x1C
  78 #define AMC6821_REG_DCY 0x22
  79 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24
  80 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25
  81 #define AMC6821_REG_DCY_LOW_TEMP 0x21
  82
  83 #define AMC6821_REG_TACH_LLIMITL 0x10
  84 #define AMC6821_REG_TACH_LLIMITH 0x11
  85 #define AMC6821_REG_TACH_HLIMITL 0x12
  86 #define AMC6821_REG_TACH_HLIMITH 0x13
  87
  88 #define AMC6821_CONF1_START 0x01
  89 #define AMC6821_CONF1_FAN_INT_EN 0x02
  90 #define AMC6821_CONF1_FANIE 0x04
  91 #define AMC6821_CONF1_PWMINV 0x08
  92 #define AMC6821_CONF1_FAN_FAULT_EN 0x10
  93 #define AMC6821_CONF1_FDRC0 0x20
  94 #define AMC6821_CONF1_FDRC1 0x40
  95 #define AMC6821_CONF1_THERMOVIE 0x80
  96
  97 #define AMC6821_CONF2_PWM_EN 0x01
  98 #define AMC6821_CONF2_TACH_MODE 0x02
  99 #define AMC6821_CONF2_TACH_EN 0x04
 100 #define AMC6821_CONF2_RTFIE 0x08
 101 #define AMC6821_CONF2_LTOIE 0x10
 102 #define AMC6821_CONF2_RTOIE 0x20
 103 #define AMC6821_CONF2_PSVIE 0x40
 104 #define AMC6821_CONF2_RST 0x80
 105
 106 #define AMC6821_CONF3_THERM_FAN_EN 0x80
 107 #define AMC6821_CONF3_REV_MASK 0x0F
 108
 109 #define AMC6821_CONF4_OVREN 0x10
 110 #define AMC6821_CONF4_TACH_FAST 0x20
 111 #define AMC6821_CONF4_PSPR 0x40
 112 #define AMC6821_CONF4_MODE 0x80
 113
 114 #define AMC6821_STAT1_RPM_ALARM 0x01
 115 #define AMC6821_STAT1_FANS 0x02
 116 #define AMC6821_STAT1_RTH 0x04
 117 #define AMC6821_STAT1_RTL 0x08
 118 #define AMC6821_STAT1_R_THERM 0x10
 119 #define AMC6821_STAT1_RTF 0x20
 120 #define AMC6821_STAT1_LTH 0x40
 121 #define AMC6821_STAT1_LTL 0x80
 122
 123 #define AMC6821_STAT2_RTC 0x08
 124 #define AMC6821_STAT2_LTC 0x10
 125 #define AMC6821_STAT2_LPSV 0x20
 126 #define AMC6821_STAT2_L_THERM 0x40
 127 #define AMC6821_STAT2_THERM_IN 0x80
 128
 129 enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
 130         IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
 131         IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
 132         TEMP_IDX_LEN, };
 133
 134 static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
 135                         AMC6821_REG_LTEMP_LIMIT_MIN,
 136                         AMC6821_REG_LTEMP_LIMIT_MAX,
 137                         AMC6821_REG_LTEMP_CRIT,
 138                         AMC6821_REG_RTEMP_HI,
 139                         AMC6821_REG_RTEMP_LIMIT_MIN,
 140                         AMC6821_REG_RTEMP_LIMIT_MAX,
 141                         AMC6821_REG_RTEMP_CRIT, };
 142
 143 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
 144         FAN1_IDX_LEN, };
 145
 146 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
 147                         AMC6821_REG_TACH_LLIMITL,
 148                         AMC6821_REG_TACH_HLIMITL, };
 149
 150
 151 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
 152                         AMC6821_REG_TACH_LLIMITH,
 153                         AMC6821_REG_TACH_HLIMITH, };
 154
 155 static int amc6821_probe(
 156                 struct i2c_client *client,
 157                 const struct i2c_device_id *id);
 158 static int amc6821_detect(
 159                 struct i2c_client *client,
 160                 struct i2c_board_info *info);
 161 static int amc6821_init_client(struct i2c_client *client);
 162 static int amc6821_remove(struct i2c_client *client);
 163 static struct amc6821_data *amc6821_update_device(struct device *dev);
 164
 165 /*
 166  * Driver data (common to all clients)
 167  */
 168
 169 static const struct i2c_device_id amc6821_id[] = {
 170         { "amc6821", amc6821 },
 171         { }
 172 };
 173
 174 MODULE_DEVICE_TABLE(i2c, amc6821_id);
 175
 176 static struct i2c_driver amc6821_driver = {
 177         .class = I2C_CLASS_HWMON,
 178         .driver = {
 179                 .name   = "amc6821",
 180         },
 181         .probe = amc6821_probe,
 182         .remove = amc6821_remove,
 183         .id_table = amc6821_id,
 184         .detect = amc6821_detect,
 185         .address_list = normal_i2c,
 186 };
 187
 188
 189 /*
 190  * Client data (each client gets its own)
 191  */
 192
 193 struct amc6821_data {
 194         struct device *hwmon_dev;
 195         struct mutex update_lock;
 196         char valid; /* zero until following fields are valid */
 197         unsigned long last_updated; /* in jiffies */
 198
 199         /* register values */
 200         int temp[TEMP_IDX_LEN];
 201
 202         u16 fan[FAN1_IDX_LEN];
 203         u8 fan1_div;
 204
 205         u8 pwm1;
 206         u8 temp1_auto_point_temp[3];
 207         u8 temp2_auto_point_temp[3];
 208         u8 pwm1_auto_point_pwm[3];
 209         u8 pwm1_enable;
 210         u8 pwm1_auto_channels_temp;
 211
 212         u8 stat1;
 213         u8 stat2;
 214 };
 215
 216
 217 static ssize_t get_temp(
 218                 struct device *dev,
 219                 struct device_attribute *devattr,
 220                 char *buf)
 221 {
 222         struct amc6821_data *data = amc6821_update_device(dev);
 223         int ix = to_sensor_dev_attr(devattr)->index;
 224
 225         return sprintf(buf, "%d\n", data->temp[ix] * 1000);
 226 }
 227
 228
 229
 230 static ssize_t set_temp(
 231                 struct device *dev,
 232                 struct device_attribute *attr,
 233                 const char *buf,
 234                 size_t count)
 235 {
 236         struct i2c_client *client = to_i2c_client(dev);
 237         struct amc6821_data *data = i2c_get_clientdata(client);
 238         int ix = to_sensor_dev_attr(attr)->index;
 239         long val;
 240
 241         int ret = kstrtol(buf, 10, &val);
 242         if (ret)
 243                 return ret;
 244         val = clamp_val(val / 1000, -128, 127);
 245
 246         mutex_lock(&data->update_lock);
 247         data->temp[ix] = val;
 248         if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
 249                 dev_err(&client->dev, "Register write error, aborting.\n");
 250                 count = -EIO;
 251         }
 252         mutex_unlock(&data->update_lock);
 253         return count;
 254 }
 255
 256
 257
 258
 259 static ssize_t get_temp_alarm(
 260         struct device *dev,
 261         struct device_attribute *devattr,
 262         char *buf)
 263 {
 264         struct amc6821_data *data = amc6821_update_device(dev);
 265         int ix = to_sensor_dev_attr(devattr)->index;
 266         u8 flag;
 267
 268         switch (ix) {
 269         case IDX_TEMP1_MIN:
 270                 flag = data->stat1 & AMC6821_STAT1_LTL;
 271                 break;
 272         case IDX_TEMP1_MAX:
 273                 flag = data->stat1 & AMC6821_STAT1_LTH;
 274                 break;
 275         case IDX_TEMP1_CRIT:
 276                 flag = data->stat2 & AMC6821_STAT2_LTC;
 277                 break;
 278         case IDX_TEMP2_MIN:
 279                 flag = data->stat1 & AMC6821_STAT1_RTL;
 280                 break;
 281         case IDX_TEMP2_MAX:
 282                 flag = data->stat1 & AMC6821_STAT1_RTH;
 283                 break;
 284         case IDX_TEMP2_CRIT:
 285                 flag = data->stat2 & AMC6821_STAT2_RTC;
 286                 break;
 287         default:
 288                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 289                 return -EINVAL;
 290         }
 291         if (flag)
 292                 return sprintf(buf, "1");
 293         else
 294                 return sprintf(buf, "0");
 295 }
 296
 297
 298
 299
 300 static ssize_t get_temp2_fault(
 301                 struct device *dev,
 302                 struct device_attribute *devattr,
 303                 char *buf)
 304 {
 305         struct amc6821_data *data = amc6821_update_device(dev);
 306         if (data->stat1 & AMC6821_STAT1_RTF)
 307                 return sprintf(buf, "1");
 308         else
 309                 return sprintf(buf, "0");
 310 }
 311
 312 static ssize_t get_pwm1(
 313                 struct device *dev,
 314                 struct device_attribute *devattr,
 315                 char *buf)
 316 {
 317         struct amc6821_data *data = amc6821_update_device(dev);
 318         return sprintf(buf, "%d\n", data->pwm1);
 319 }
 320
 321 static ssize_t set_pwm1(
 322                 struct device *dev,
 323                 struct device_attribute *devattr,
 324                 const char *buf,
 325                 size_t count)
 326 {
 327         struct i2c_client *client = to_i2c_client(dev);
 328         struct amc6821_data *data = i2c_get_clientdata(client);
 329         long val;
 330         int ret = kstrtol(buf, 10, &val);
 331         if (ret)
 332                 return ret;
 333
 334         mutex_lock(&data->update_lock);
 335         data->pwm1 = clamp_val(val , 0, 255);
 336         i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
 337         mutex_unlock(&data->update_lock);
 338         return count;
 339 }
 340
 341 static ssize_t get_pwm1_enable(
 342                 struct device *dev,
 343                 struct device_attribute *devattr,
 344                 char *buf)
 345 {
 346         struct amc6821_data *data = amc6821_update_device(dev);
 347         return sprintf(buf, "%d\n", data->pwm1_enable);
 348 }
 349
 350 static ssize_t set_pwm1_enable(
 351                 struct device *dev,
 352                 struct device_attribute *attr,
 353                 const char *buf,
 354                 size_t count)
 355 {
 356         struct i2c_client *client = to_i2c_client(dev);
 357         struct amc6821_data *data = i2c_get_clientdata(client);
 358         long val;
 359         int config = kstrtol(buf, 10, &val);
 360         if (config)
 361                 return config;
 362
 363         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 364         if (config < 0) {
 365                         dev_err(&client->dev,
 366                         "Error reading configuration register, aborting.\n");
 367                         return -EIO;
 368         }
 369
 370         switch (val) {
 371         case 1:
 372                 config &= ~AMC6821_CONF1_FDRC0;
 373                 config &= ~AMC6821_CONF1_FDRC1;
 374                 break;
 375         case 2:
 376                 config &= ~AMC6821_CONF1_FDRC0;
 377                 config |= AMC6821_CONF1_FDRC1;
 378                 break;
 379         case 3:
 380                 config |= AMC6821_CONF1_FDRC0;
 381                 config |= AMC6821_CONF1_FDRC1;
 382                 break;
 383         default:
 384                 return -EINVAL;
 385         }
 386         mutex_lock(&data->update_lock);
 387         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
 388                         dev_err(&client->dev,
 389                         "Configuration register write error, aborting.\n");
 390                         count = -EIO;
 391         }
 392         mutex_unlock(&data->update_lock);
 393         return count;
 394 }
 395
 396
 397 static ssize_t get_pwm1_auto_channels_temp(
 398                 struct device *dev,
 399                 struct device_attribute *devattr,
 400                 char *buf)
 401 {
 402         struct amc6821_data *data = amc6821_update_device(dev);
 403         return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
 404 }
 405
 406
 407 static ssize_t get_temp_auto_point_temp(
 408                 struct device *dev,
 409                 struct device_attribute *devattr,
 410                 char *buf)
 411 {
 412         int ix = to_sensor_dev_attr_2(devattr)->index;
 413         int nr = to_sensor_dev_attr_2(devattr)->nr;
 414         struct amc6821_data *data = amc6821_update_device(dev);
 415         switch (nr) {
 416         case 1:
 417                 return sprintf(buf, "%d\n",
 418                         data->temp1_auto_point_temp[ix] * 1000);
 419                 break;
 420         case 2:
 421                 return sprintf(buf, "%d\n",
 422                         data->temp2_auto_point_temp[ix] * 1000);
 423                 break;
 424         default:
 425                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 426                 return -EINVAL;
 427         }
 428 }
 429
 430
 431 static ssize_t get_pwm1_auto_point_pwm(
 432                 struct device *dev,
 433                 struct device_attribute *devattr,
 434                 char *buf)
 435 {
 436         int ix = to_sensor_dev_attr(devattr)->index;
 437         struct amc6821_data *data = amc6821_update_device(dev);
 438         return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
 439 }
 440
 441
 442 static inline ssize_t set_slope_register(struct i2c_client *client,
 443                 u8 reg,
 444                 u8 dpwm,
 445                 u8 *ptemp)
 446 {
 447         int dt;
 448         u8 tmp;
 449
 450         dt = ptemp[2]-ptemp[1];
 451         for (tmp = 4; tmp > 0; tmp--) {
 452                 if (dt * (0x20 >> tmp) >= dpwm)
 453                         break;
 454         }
 455         tmp |= (ptemp[1] & 0x7C) << 1;
 456         if (i2c_smbus_write_byte_data(client,
 457                         reg, tmp)) {
 458                 dev_err(&client->dev, "Register write error, aborting.\n");
 459                 return -EIO;
 460         }
 461         return 0;
 462 }
 463
 464
 465
 466 static ssize_t set_temp_auto_point_temp(
 467                 struct device *dev,
 468                 struct device_attribute *attr,
 469                 const char *buf,
 470                 size_t count)
 471 {
 472         struct i2c_client *client = to_i2c_client(dev);
 473         struct amc6821_data *data = amc6821_update_device(dev);
 474         int ix = to_sensor_dev_attr_2(attr)->index;
 475         int nr = to_sensor_dev_attr_2(attr)->nr;
 476         u8 *ptemp;
 477         u8 reg;
 478         int dpwm;
 479         long val;
 480         int ret = kstrtol(buf, 10, &val);
 481         if (ret)
 482                 return ret;
 483
 484         switch (nr) {
 485         case 1:
 486                 ptemp = data->temp1_auto_point_temp;
 487                 reg = AMC6821_REG_LTEMP_FAN_CTRL;
 488                 break;
 489         case 2:
 490                 ptemp = data->temp2_auto_point_temp;
 491                 reg = AMC6821_REG_RTEMP_FAN_CTRL;
 492                 break;
 493         default:
 494                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 495                 return -EINVAL;
 496         }
 497
 498         data->valid = 0;
 499         mutex_lock(&data->update_lock);
 500         switch (ix) {
 501         case 0:
 502                 ptemp[0] = clamp_val(val / 1000, 0,
 503                                      data->temp1_auto_point_temp[1]);
 504                 ptemp[0] = clamp_val(ptemp[0], 0,
 505                                      data->temp2_auto_point_temp[1]);
 506                 ptemp[0] = clamp_val(ptemp[0], 0, 63);
 507                 if (i2c_smbus_write_byte_data(
 508                                         client,
 509                                         AMC6821_REG_PSV_TEMP,
 510                                         ptemp[0])) {
 511                                 dev_err(&client->dev,
 512                                         "Register write error, aborting.\n");
 513                                 count = -EIO;
 514                 }
 515                 goto EXIT;
 516                 break;
 517         case 1:
 518                 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
 519                 ptemp[1] &= 0x7C;
 520                 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
 521                 break;
 522         case 2:
 523                 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
 524                 break;
 525         default:
 526                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 527                 count = -EINVAL;
 528                 goto EXIT;
 529         }
 530         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 531         if (set_slope_register(client, reg, dpwm, ptemp))
 532                 count = -EIO;
 533
 534 EXIT:
 535         mutex_unlock(&data->update_lock);
 536         return count;
 537 }
 538
 539
 540
 541 static ssize_t set_pwm1_auto_point_pwm(
 542                 struct device *dev,
 543                 struct device_attribute *attr,
 544                 const char *buf,
 545                 size_t count)
 546 {
 547         struct i2c_client *client = to_i2c_client(dev);
 548         struct amc6821_data *data = i2c_get_clientdata(client);
 549         int dpwm;
 550         long val;
 551         int ret = kstrtol(buf, 10, &val);
 552         if (ret)
 553                 return ret;
 554
 555         mutex_lock(&data->update_lock);
 556         data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
 557         if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
 558                         data->pwm1_auto_point_pwm[1])) {
 559                 dev_err(&client->dev, "Register write error, aborting.\n");
 560                 count = -EIO;
 561                 goto EXIT;
 562         }
 563         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 564         if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
 565                         data->temp1_auto_point_temp)) {
 566                 count = -EIO;
 567                 goto EXIT;
 568         }
 569         if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
 570                         data->temp2_auto_point_temp)) {
 571                 count = -EIO;
 572                 goto EXIT;
 573         }
 574
 575 EXIT:
 576         data->valid = 0;
 577         mutex_unlock(&data->update_lock);
 578         return count;
 579 }
 580
 581 static ssize_t get_fan(
 582                 struct device *dev,
 583                 struct device_attribute *devattr,
 584                 char *buf)
 585 {
 586         struct amc6821_data *data = amc6821_update_device(dev);
 587         int ix = to_sensor_dev_attr(devattr)->index;
 588         if (0 == data->fan[ix])
 589                 return sprintf(buf, "0");
 590         return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
 591 }
 592
 593
 594
 595 static ssize_t get_fan1_fault(
 596                 struct device *dev,
 597                 struct device_attribute *devattr,
 598                 char *buf)
 599 {
 600         struct amc6821_data *data = amc6821_update_device(dev);
 601         if (data->stat1 & AMC6821_STAT1_FANS)
 602                 return sprintf(buf, "1");
 603         else
 604                 return sprintf(buf, "0");
 605 }
 606
 607
 608
 609 static ssize_t set_fan(
 610                 struct device *dev,
 611                 struct device_attribute *attr,
 612                 const char *buf, size_t count)
 613 {
 614         struct i2c_client *client = to_i2c_client(dev);
 615         struct amc6821_data *data = i2c_get_clientdata(client);
 616         long val;
 617         int ix = to_sensor_dev_attr(attr)->index;
 618         int ret = kstrtol(buf, 10, &val);
 619         if (ret)
 620                 return ret;
 621         val = 1 > val ? 0xFFFF : 6000000/val;
 622
 623         mutex_lock(&data->update_lock);
 624         data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
 625         if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
 626                         data->fan[ix] & 0xFF)) {
 627                 dev_err(&client->dev, "Register write error, aborting.\n");
 628                 count = -EIO;
 629                 goto EXIT;
 630         }
 631         if (i2c_smbus_write_byte_data(client,
 632                         fan_reg_hi[ix], data->fan[ix] >> 8)) {
 633                 dev_err(&client->dev, "Register write error, aborting.\n");
 634                 count = -EIO;
 635         }
 636 EXIT:
 637         mutex_unlock(&data->update_lock);
 638         return count;
 639 }
 640
 641
 642
 643 static ssize_t get_fan1_div(
 644                 struct device *dev,
 645                 struct device_attribute *devattr,
 646                 char *buf)
 647 {
 648         struct amc6821_data *data = amc6821_update_device(dev);
 649         return sprintf(buf, "%d\n", data->fan1_div);
 650 }
 651
 652 static ssize_t set_fan1_div(
 653                 struct device *dev,
 654                 struct device_attribute *attr,
 655                 const char *buf, size_t count)
 656 {
 657         struct i2c_client *client = to_i2c_client(dev);
 658         struct amc6821_data *data = i2c_get_clientdata(client);
 659         long val;
 660         int config = kstrtol(buf, 10, &val);
 661         if (config)
 662                 return config;
 663
 664         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 665         if (config < 0) {
 666                 dev_err(&client->dev,
 667                         "Error reading configuration register, aborting.\n");
 668                 return -EIO;
 669         }
 670         mutex_lock(&data->update_lock);
 671         switch (val) {
 672         case 2:
 673                 config &= ~AMC6821_CONF4_PSPR;
 674                 data->fan1_div = 2;
 675                 break;
 676         case 4:
 677                 config |= AMC6821_CONF4_PSPR;
 678                 data->fan1_div = 4;
 679                 break;
 680         default:
 681                 count = -EINVAL;
 682                 goto EXIT;
 683         }
 684         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
 685                 dev_err(&client->dev,
 686                         "Configuration register write error, aborting.\n");
 687                 count = -EIO;
 688         }
 689 EXIT:
 690         mutex_unlock(&data->update_lock);
 691         return count;
 692 }
 693
 694
 695
 696 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 697         get_temp, NULL, IDX_TEMP1_INPUT);
 698 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
 699         set_temp, IDX_TEMP1_MIN);
 700 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
 701         set_temp, IDX_TEMP1_MAX);
 702 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
 703         set_temp, IDX_TEMP1_CRIT);
 704 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
 705         get_temp_alarm, NULL, IDX_TEMP1_MIN);
 706 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
 707         get_temp_alarm, NULL, IDX_TEMP1_MAX);
 708 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
 709         get_temp_alarm, NULL, IDX_TEMP1_CRIT);
 710 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
 711         get_temp, NULL, IDX_TEMP2_INPUT);
 712 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
 713         set_temp, IDX_TEMP2_MIN);
 714 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
 715         set_temp, IDX_TEMP2_MAX);
 716 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
 717         set_temp, IDX_TEMP2_CRIT);
 718 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
 719         get_temp2_fault, NULL, 0);
 720 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
 721         get_temp_alarm, NULL, IDX_TEMP2_MIN);
 722 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
 723         get_temp_alarm, NULL, IDX_TEMP2_MAX);
 724 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
 725         get_temp_alarm, NULL, IDX_TEMP2_CRIT);
 726 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
 727 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 728         get_fan, set_fan, IDX_FAN1_MIN);
 729 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
 730         get_fan, set_fan, IDX_FAN1_MAX);
 731 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
 732 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 733         get_fan1_div, set_fan1_div, 0);
 734
 735 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
 736 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
 737         get_pwm1_enable, set_pwm1_enable, 0);
 738 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
 739         get_pwm1_auto_point_pwm, NULL, 0);
 740 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
 741         get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
 742 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
 743         get_pwm1_auto_point_pwm, NULL, 2);
 744 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
 745         get_pwm1_auto_channels_temp, NULL, 0);
 746 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
 747         get_temp_auto_point_temp, NULL, 1, 0);
 748 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
 749         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
 750 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
 751         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
 752
 753 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
 754         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
 755 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
 756         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
 757 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
 758         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
 759
 760
 761
 762 static struct attribute *amc6821_attrs[] = {
 763         &sensor_dev_attr_temp1_input.dev_attr.attr,
 764         &sensor_dev_attr_temp1_min.dev_attr.attr,
 765         &sensor_dev_attr_temp1_max.dev_attr.attr,
 766         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 767         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 768         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 769         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 770         &sensor_dev_attr_temp2_input.dev_attr.attr,
 771         &sensor_dev_attr_temp2_min.dev_attr.attr,
 772         &sensor_dev_attr_temp2_max.dev_attr.attr,
 773         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 774         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 775         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 776         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 777         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 778         &sensor_dev_attr_fan1_input.dev_attr.attr,
 779         &sensor_dev_attr_fan1_min.dev_attr.attr,
 780         &sensor_dev_attr_fan1_max.dev_attr.attr,
 781         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 782         &sensor_dev_attr_fan1_div.dev_attr.attr,
 783         &sensor_dev_attr_pwm1.dev_attr.attr,
 784         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 785         &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
 786         &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
 787         &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
 788         &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
 789         &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
 790         &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
 791         &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
 792         &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
 793         &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
 794         &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
 795         NULL
 796 };
 797
 798 static struct attribute_group amc6821_attr_grp = {
 799         .attrs = amc6821_attrs,
 800 };
 801
 802
 803
 804 /* Return 0 if detection is successful, -ENODEV otherwise */
 805 static int amc6821_detect(
 806                 struct i2c_client *client,
 807                 struct i2c_board_info *info)
 808 {
 809         struct i2c_adapter *adapter = client->adapter;
 810         int address = client->addr;
 811         int dev_id, comp_id;
 812
 813         dev_dbg(&adapter->dev, "amc6821_detect called.\n");
 814
 815         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 816                 dev_dbg(&adapter->dev,
 817                         "amc6821: I2C bus doesn't support byte mode, "
 818                         "skipping.\n");
 819                 return -ENODEV;
 820         }
 821
 822         dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
 823         comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
 824         if (dev_id != 0x21 || comp_id != 0x49) {
 825                 dev_dbg(&adapter->dev,
 826                         "amc6821: detection failed at 0x%02x.\n",
 827                         address);
 828                 return -ENODEV;
 829         }
 830
 831         /*
 832          * Bit 7 of the address register is ignored, so we can check the
 833          * ID registers again
 834          */
 835         dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
 836         comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
 837         if (dev_id != 0x21 || comp_id != 0x49) {
 838                 dev_dbg(&adapter->dev,
 839                         "amc6821: detection failed at 0x%02x.\n",
 840                         address);
 841                 return -ENODEV;
 842         }
 843
 844         dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
 845         strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
 846
 847         return 0;
 848 }
 849
 850 static int amc6821_probe(
 851         struct i2c_client *client,
 852         const struct i2c_device_id *id)
 853 {
 854         struct amc6821_data *data;
 855         int err;
 856
 857         data = devm_kzalloc(&client->dev, sizeof(struct amc6821_data),
 858                             GFP_KERNEL);
 859         if (!data)
 860                 return -ENOMEM;
 861
 862         i2c_set_clientdata(client, data);
 863         mutex_init(&data->update_lock);
 864
 865         /*
 866          * Initialize the amc6821 chip
 867          */
 868         err = amc6821_init_client(client);
 869         if (err)
 870                 return err;
 871
 872         err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
 873         if (err)
 874                 return err;
 875
 876         data->hwmon_dev = hwmon_device_register(&client->dev);
 877         if (!IS_ERR(data->hwmon_dev))
 878                 return 0;
 879
 880         err = PTR_ERR(data->hwmon_dev);
 881         dev_err(&client->dev, "error registering hwmon device.\n");
 882         sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
 883         return err;
 884 }
 885
 886 static int amc6821_remove(struct i2c_client *client)
 887 {
 888         struct amc6821_data *data = i2c_get_clientdata(client);
 889
 890         hwmon_device_unregister(data->hwmon_dev);
 891         sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
 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                 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
 929
 930                 config &= ~AMC6821_CONF3_THERM_FAN_EN;
 931
 932                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
 933                                 config)) {
 934                         dev_err(&client->dev,
 935                         "Configuration register write error, aborting.\n");
 936                         return err;
 937                 }
 938
 939                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
 940
 941                 if (config < 0) {
 942                         dev_err(&client->dev,
 943                         "Error reading configuration register, aborting.\n");
 944                         return err;
 945                 }
 946
 947                 config &= ~AMC6821_CONF2_RTFIE;
 948                 config &= ~AMC6821_CONF2_LTOIE;
 949                 config &= ~AMC6821_CONF2_RTOIE;
 950                 if (i2c_smbus_write_byte_data(client,
 951                                 AMC6821_REG_CONF2, config)) {
 952                         dev_err(&client->dev,
 953                         "Configuration register write error, aborting.\n");
 954                         return err;
 955                 }
 956
 957                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 958
 959                 if (config < 0) {
 960                         dev_err(&client->dev,
 961                         "Error reading configuration register, aborting.\n");
 962                         return err;
 963                 }
 964
 965                 config &= ~AMC6821_CONF1_THERMOVIE;
 966                 config &= ~AMC6821_CONF1_FANIE;
 967                 config |= AMC6821_CONF1_START;
 968                 if (pwminv)
 969                         config |= AMC6821_CONF1_PWMINV;
 970                 else
 971                         config &= ~AMC6821_CONF1_PWMINV;
 972
 973                 if (i2c_smbus_write_byte_data(
 974                                 client, AMC6821_REG_CONF1, config)) {
 975                         dev_err(&client->dev,
 976                         "Configuration register write error, aborting.\n");
 977                         return err;
 978                 }
 979         }
 980         return 0;
 981 }
 982
 983
 984 static struct amc6821_data *amc6821_update_device(struct device *dev)
 985 {
 986         struct i2c_client *client = to_i2c_client(dev);
 987         struct amc6821_data *data = i2c_get_clientdata(client);
 988         int timeout = HZ;
 989         u8 reg;
 990         int i;
 991
 992         mutex_lock(&data->update_lock);
 993
 994         if (time_after(jiffies, data->last_updated + timeout) ||
 995                         !data->valid) {
 996
 997                 for (i = 0; i < TEMP_IDX_LEN; i++)
 998                         data->temp[i] = i2c_smbus_read_byte_data(client,
 999                                 temp_reg[i]);
1000
1001                 data->stat1 = i2c_smbus_read_byte_data(client,
1002                         AMC6821_REG_STAT1);
1003                 data->stat2 = i2c_smbus_read_byte_data(client,
1004                         AMC6821_REG_STAT2);
1005
1006                 data->pwm1 = i2c_smbus_read_byte_data(client,
1007                         AMC6821_REG_DCY);
1008                 for (i = 0; i < FAN1_IDX_LEN; i++) {
1009                         data->fan[i] = i2c_smbus_read_byte_data(
1010                                         client,
1011                                         fan_reg_low[i]);
1012                         data->fan[i] += i2c_smbus_read_byte_data(
1013                                         client,
1014                                         fan_reg_hi[i]) << 8;
1015                 }
1016                 data->fan1_div = i2c_smbus_read_byte_data(client,
1017                         AMC6821_REG_CONF4);
1018                 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1019
1020                 data->pwm1_auto_point_pwm[0] = 0;
1021                 data->pwm1_auto_point_pwm[2] = 255;
1022                 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1023                         AMC6821_REG_DCY_LOW_TEMP);
1024
1025                 data->temp1_auto_point_temp[0] =
1026                         i2c_smbus_read_byte_data(client,
1027                                         AMC6821_REG_PSV_TEMP);
1028                 data->temp2_auto_point_temp[0] =
1029                                 data->temp1_auto_point_temp[0];
1030                 reg = i2c_smbus_read_byte_data(client,
1031                         AMC6821_REG_LTEMP_FAN_CTRL);
1032                 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1033                 reg &= 0x07;
1034                 reg = 0x20 >> reg;
1035                 if (reg > 0)
1036                         data->temp1_auto_point_temp[2] =
1037                                 data->temp1_auto_point_temp[1] +
1038                                 (data->pwm1_auto_point_pwm[2] -
1039                                 data->pwm1_auto_point_pwm[1]) / reg;
1040                 else
1041                         data->temp1_auto_point_temp[2] = 255;
1042
1043                 reg = i2c_smbus_read_byte_data(client,
1044                         AMC6821_REG_RTEMP_FAN_CTRL);
1045                 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1046                 reg &= 0x07;
1047                 reg = 0x20 >> reg;
1048                 if (reg > 0)
1049                         data->temp2_auto_point_temp[2] =
1050                                 data->temp2_auto_point_temp[1] +
1051                                 (data->pwm1_auto_point_pwm[2] -
1052                                 data->pwm1_auto_point_pwm[1]) / reg;
1053                 else
1054                         data->temp2_auto_point_temp[2] = 255;
1055
1056                 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1057                 reg = (reg >> 5) & 0x3;
1058                 switch (reg) {
1059                 case 0: /*open loop: software sets pwm1*/
1060                         data->pwm1_auto_channels_temp = 0;
1061                         data->pwm1_enable = 1;
1062                         break;
1063                 case 2: /*closed loop: remote T (temp2)*/
1064                         data->pwm1_auto_channels_temp = 2;
1065                         data->pwm1_enable = 2;
1066                         break;
1067                 case 3: /*closed loop: local and remote T (temp2)*/
1068                         data->pwm1_auto_channels_temp = 3;
1069                         data->pwm1_enable = 3;
1070                         break;
1071                 case 1: /*
1072                          * semi-open loop: software sets rpm, chip controls
1073                          * pwm1, currently not implemented
1074                          */
1075                         data->pwm1_auto_channels_temp = 0;
1076                         data->pwm1_enable = 0;
1077                         break;
1078                 }
1079
1080                 data->last_updated = jiffies;
1081                 data->valid = 1;
1082         }
1083         mutex_unlock(&data->update_lock);
1084         return data;
1085 }
1086
1087 module_i2c_driver(amc6821_driver);
1088
1089 MODULE_LICENSE("GPL");
1090 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1091 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");