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         mutex_lock(&data->update_lock);
 364         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 365         if (config < 0) {
 366                         dev_err(&client->dev,
 367                         "Error reading configuration register, aborting.\n");
 368                         count = config;
 369                         goto unlock;
 370         }
 371
 372         switch (val) {
 373         case 1:
 374                 config &= ~AMC6821_CONF1_FDRC0;
 375                 config &= ~AMC6821_CONF1_FDRC1;
 376                 break;
 377         case 2:
 378                 config &= ~AMC6821_CONF1_FDRC0;
 379                 config |= AMC6821_CONF1_FDRC1;
 380                 break;
 381         case 3:
 382                 config |= AMC6821_CONF1_FDRC0;
 383                 config |= AMC6821_CONF1_FDRC1;
 384                 break;
 385         default:
 386                 count = -EINVAL;
 387                 goto unlock;
 388         }
 389         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
 390                         dev_err(&client->dev,
 391                         "Configuration register write error, aborting.\n");
 392                         count = -EIO;
 393         }
 394 unlock:
 395         mutex_unlock(&data->update_lock);
 396         return count;
 397 }
 398
 399
 400 static ssize_t get_pwm1_auto_channels_temp(
 401                 struct device *dev,
 402                 struct device_attribute *devattr,
 403                 char *buf)
 404 {
 405         struct amc6821_data *data = amc6821_update_device(dev);
 406         return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
 407 }
 408
 409
 410 static ssize_t get_temp_auto_point_temp(
 411                 struct device *dev,
 412                 struct device_attribute *devattr,
 413                 char *buf)
 414 {
 415         int ix = to_sensor_dev_attr_2(devattr)->index;
 416         int nr = to_sensor_dev_attr_2(devattr)->nr;
 417         struct amc6821_data *data = amc6821_update_device(dev);
 418         switch (nr) {
 419         case 1:
 420                 return sprintf(buf, "%d\n",
 421                         data->temp1_auto_point_temp[ix] * 1000);
 422         case 2:
 423                 return sprintf(buf, "%d\n",
 424                         data->temp2_auto_point_temp[ix] * 1000);
 425         default:
 426                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 427                 return -EINVAL;
 428         }
 429 }
 430
 431
 432 static ssize_t get_pwm1_auto_point_pwm(
 433                 struct device *dev,
 434                 struct device_attribute *devattr,
 435                 char *buf)
 436 {
 437         int ix = to_sensor_dev_attr(devattr)->index;
 438         struct amc6821_data *data = amc6821_update_device(dev);
 439         return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
 440 }
 441
 442
 443 static inline ssize_t set_slope_register(struct i2c_client *client,
 444                 u8 reg,
 445                 u8 dpwm,
 446                 u8 *ptemp)
 447 {
 448         int dt;
 449         u8 tmp;
 450
 451         dt = ptemp[2]-ptemp[1];
 452         for (tmp = 4; tmp > 0; tmp--) {
 453                 if (dt * (0x20 >> tmp) >= dpwm)
 454                         break;
 455         }
 456         tmp |= (ptemp[1] & 0x7C) << 1;
 457         if (i2c_smbus_write_byte_data(client,
 458                         reg, tmp)) {
 459                 dev_err(&client->dev, "Register write error, aborting.\n");
 460                 return -EIO;
 461         }
 462         return 0;
 463 }
 464
 465
 466
 467 static ssize_t set_temp_auto_point_temp(
 468                 struct device *dev,
 469                 struct device_attribute *attr,
 470                 const char *buf,
 471                 size_t count)
 472 {
 473         struct i2c_client *client = to_i2c_client(dev);
 474         struct amc6821_data *data = amc6821_update_device(dev);
 475         int ix = to_sensor_dev_attr_2(attr)->index;
 476         int nr = to_sensor_dev_attr_2(attr)->nr;
 477         u8 *ptemp;
 478         u8 reg;
 479         int dpwm;
 480         long val;
 481         int ret = kstrtol(buf, 10, &val);
 482         if (ret)
 483                 return ret;
 484
 485         switch (nr) {
 486         case 1:
 487                 ptemp = data->temp1_auto_point_temp;
 488                 reg = AMC6821_REG_LTEMP_FAN_CTRL;
 489                 break;
 490         case 2:
 491                 ptemp = data->temp2_auto_point_temp;
 492                 reg = AMC6821_REG_RTEMP_FAN_CTRL;
 493                 break;
 494         default:
 495                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 496                 return -EINVAL;
 497         }
 498
 499         mutex_lock(&data->update_lock);
 500         data->valid = 0;
 501
 502         switch (ix) {
 503         case 0:
 504                 ptemp[0] = clamp_val(val / 1000, 0,
 505                                      data->temp1_auto_point_temp[1]);
 506                 ptemp[0] = clamp_val(ptemp[0], 0,
 507                                      data->temp2_auto_point_temp[1]);
 508                 ptemp[0] = clamp_val(ptemp[0], 0, 63);
 509                 if (i2c_smbus_write_byte_data(
 510                                         client,
 511                                         AMC6821_REG_PSV_TEMP,
 512                                         ptemp[0])) {
 513                                 dev_err(&client->dev,
 514                                         "Register write error, aborting.\n");
 515                                 count = -EIO;
 516                 }
 517                 goto EXIT;
 518         case 1:
 519                 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
 520                 ptemp[1] &= 0x7C;
 521                 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
 522                 break;
 523         case 2:
 524                 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
 525                 break;
 526         default:
 527                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 528                 count = -EINVAL;
 529                 goto EXIT;
 530         }
 531         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 532         if (set_slope_register(client, reg, dpwm, ptemp))
 533                 count = -EIO;
 534
 535 EXIT:
 536         mutex_unlock(&data->update_lock);
 537         return count;
 538 }
 539
 540
 541
 542 static ssize_t set_pwm1_auto_point_pwm(
 543                 struct device *dev,
 544                 struct device_attribute *attr,
 545                 const char *buf,
 546                 size_t count)
 547 {
 548         struct i2c_client *client = to_i2c_client(dev);
 549         struct amc6821_data *data = i2c_get_clientdata(client);
 550         int dpwm;
 551         long val;
 552         int ret = kstrtol(buf, 10, &val);
 553         if (ret)
 554                 return ret;
 555
 556         mutex_lock(&data->update_lock);
 557         data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
 558         if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
 559                         data->pwm1_auto_point_pwm[1])) {
 560                 dev_err(&client->dev, "Register write error, aborting.\n");
 561                 count = -EIO;
 562                 goto EXIT;
 563         }
 564         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 565         if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
 566                         data->temp1_auto_point_temp)) {
 567                 count = -EIO;
 568                 goto EXIT;
 569         }
 570         if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
 571                         data->temp2_auto_point_temp)) {
 572                 count = -EIO;
 573                 goto EXIT;
 574         }
 575
 576 EXIT:
 577         data->valid = 0;
 578         mutex_unlock(&data->update_lock);
 579         return count;
 580 }
 581
 582 static ssize_t get_fan(
 583                 struct device *dev,
 584                 struct device_attribute *devattr,
 585                 char *buf)
 586 {
 587         struct amc6821_data *data = amc6821_update_device(dev);
 588         int ix = to_sensor_dev_attr(devattr)->index;
 589         if (0 == data->fan[ix])
 590                 return sprintf(buf, "0");
 591         return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
 592 }
 593
 594
 595
 596 static ssize_t get_fan1_fault(
 597                 struct device *dev,
 598                 struct device_attribute *devattr,
 599                 char *buf)
 600 {
 601         struct amc6821_data *data = amc6821_update_device(dev);
 602         if (data->stat1 & AMC6821_STAT1_FANS)
 603                 return sprintf(buf, "1");
 604         else
 605                 return sprintf(buf, "0");
 606 }
 607
 608
 609
 610 static ssize_t set_fan(
 611                 struct device *dev,
 612                 struct device_attribute *attr,
 613                 const char *buf, size_t count)
 614 {
 615         struct i2c_client *client = to_i2c_client(dev);
 616         struct amc6821_data *data = i2c_get_clientdata(client);
 617         long val;
 618         int ix = to_sensor_dev_attr(attr)->index;
 619         int ret = kstrtol(buf, 10, &val);
 620         if (ret)
 621                 return ret;
 622         val = 1 > val ? 0xFFFF : 6000000/val;
 623
 624         mutex_lock(&data->update_lock);
 625         data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
 626         if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
 627                         data->fan[ix] & 0xFF)) {
 628                 dev_err(&client->dev, "Register write error, aborting.\n");
 629                 count = -EIO;
 630                 goto EXIT;
 631         }
 632         if (i2c_smbus_write_byte_data(client,
 633                         fan_reg_hi[ix], data->fan[ix] >> 8)) {
 634                 dev_err(&client->dev, "Register write error, aborting.\n");
 635                 count = -EIO;
 636         }
 637 EXIT:
 638         mutex_unlock(&data->update_lock);
 639         return count;
 640 }
 641
 642
 643
 644 static ssize_t get_fan1_div(
 645                 struct device *dev,
 646                 struct device_attribute *devattr,
 647                 char *buf)
 648 {
 649         struct amc6821_data *data = amc6821_update_device(dev);
 650         return sprintf(buf, "%d\n", data->fan1_div);
 651 }
 652
 653 static ssize_t set_fan1_div(
 654                 struct device *dev,
 655                 struct device_attribute *attr,
 656                 const char *buf, size_t count)
 657 {
 658         struct i2c_client *client = to_i2c_client(dev);
 659         struct amc6821_data *data = i2c_get_clientdata(client);
 660         long val;
 661         int config = kstrtol(buf, 10, &val);
 662         if (config)
 663                 return config;
 664
 665         mutex_lock(&data->update_lock);
 666         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 667         if (config < 0) {
 668                 dev_err(&client->dev,
 669                         "Error reading configuration register, aborting.\n");
 670                 count = config;
 671                 goto EXIT;
 672         }
 673         switch (val) {
 674         case 2:
 675                 config &= ~AMC6821_CONF4_PSPR;
 676                 data->fan1_div = 2;
 677                 break;
 678         case 4:
 679                 config |= AMC6821_CONF4_PSPR;
 680                 data->fan1_div = 4;
 681                 break;
 682         default:
 683                 count = -EINVAL;
 684                 goto EXIT;
 685         }
 686         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
 687                 dev_err(&client->dev,
 688                         "Configuration register write error, aborting.\n");
 689                 count = -EIO;
 690         }
 691 EXIT:
 692         mutex_unlock(&data->update_lock);
 693         return count;
 694 }
 695
 696
 697
 698 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 699         get_temp, NULL, IDX_TEMP1_INPUT);
 700 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
 701         set_temp, IDX_TEMP1_MIN);
 702 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
 703         set_temp, IDX_TEMP1_MAX);
 704 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
 705         set_temp, IDX_TEMP1_CRIT);
 706 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
 707         get_temp_alarm, NULL, IDX_TEMP1_MIN);
 708 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
 709         get_temp_alarm, NULL, IDX_TEMP1_MAX);
 710 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
 711         get_temp_alarm, NULL, IDX_TEMP1_CRIT);
 712 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
 713         get_temp, NULL, IDX_TEMP2_INPUT);
 714 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
 715         set_temp, IDX_TEMP2_MIN);
 716 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
 717         set_temp, IDX_TEMP2_MAX);
 718 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
 719         set_temp, IDX_TEMP2_CRIT);
 720 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
 721         get_temp2_fault, NULL, 0);
 722 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
 723         get_temp_alarm, NULL, IDX_TEMP2_MIN);
 724 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
 725         get_temp_alarm, NULL, IDX_TEMP2_MAX);
 726 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
 727         get_temp_alarm, NULL, IDX_TEMP2_CRIT);
 728 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
 729 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 730         get_fan, set_fan, IDX_FAN1_MIN);
 731 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
 732         get_fan, set_fan, IDX_FAN1_MAX);
 733 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
 734 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 735         get_fan1_div, set_fan1_div, 0);
 736
 737 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
 738 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
 739         get_pwm1_enable, set_pwm1_enable, 0);
 740 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
 741         get_pwm1_auto_point_pwm, NULL, 0);
 742 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
 743         get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
 744 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
 745         get_pwm1_auto_point_pwm, NULL, 2);
 746 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
 747         get_pwm1_auto_channels_temp, NULL, 0);
 748 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
 749         get_temp_auto_point_temp, NULL, 1, 0);
 750 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
 751         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
 752 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
 753         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
 754
 755 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
 756         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
 757 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
 758         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
 759 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
 760         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
 761
 762
 763
 764 static struct attribute *amc6821_attrs[] = {
 765         &sensor_dev_attr_temp1_input.dev_attr.attr,
 766         &sensor_dev_attr_temp1_min.dev_attr.attr,
 767         &sensor_dev_attr_temp1_max.dev_attr.attr,
 768         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 769         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 770         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 771         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 772         &sensor_dev_attr_temp2_input.dev_attr.attr,
 773         &sensor_dev_attr_temp2_min.dev_attr.attr,
 774         &sensor_dev_attr_temp2_max.dev_attr.attr,
 775         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 776         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 777         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 778         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 779         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 780         &sensor_dev_attr_fan1_input.dev_attr.attr,
 781         &sensor_dev_attr_fan1_min.dev_attr.attr,
 782         &sensor_dev_attr_fan1_max.dev_attr.attr,
 783         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 784         &sensor_dev_attr_fan1_div.dev_attr.attr,
 785         &sensor_dev_attr_pwm1.dev_attr.attr,
 786         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 787         &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
 788         &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
 789         &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
 790         &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
 791         &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
 792         &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
 793         &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
 794         &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
 795         &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
 796         &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
 797         NULL
 798 };
 799
 800 static struct attribute_group amc6821_attr_grp = {
 801         .attrs = amc6821_attrs,
 802 };
 803
 804
 805
 806 /* Return 0 if detection is successful, -ENODEV otherwise */
 807 static int amc6821_detect(
 808                 struct i2c_client *client,
 809                 struct i2c_board_info *info)
 810 {
 811         struct i2c_adapter *adapter = client->adapter;
 812         int address = client->addr;
 813         int dev_id, comp_id;
 814
 815         dev_dbg(&adapter->dev, "amc6821_detect called.\n");
 816
 817         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 818                 dev_dbg(&adapter->dev,
 819                         "amc6821: I2C bus doesn't support byte mode, "
 820                         "skipping.\n");
 821                 return -ENODEV;
 822         }
 823
 824         dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
 825         comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
 826         if (dev_id != 0x21 || comp_id != 0x49) {
 827                 dev_dbg(&adapter->dev,
 828                         "amc6821: detection failed at 0x%02x.\n",
 829                         address);
 830                 return -ENODEV;
 831         }
 832
 833         /*
 834          * Bit 7 of the address register is ignored, so we can check the
 835          * ID registers again
 836          */
 837         dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
 838         comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
 839         if (dev_id != 0x21 || comp_id != 0x49) {
 840                 dev_dbg(&adapter->dev,
 841                         "amc6821: detection failed at 0x%02x.\n",
 842                         address);
 843                 return -ENODEV;
 844         }
 845
 846         dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
 847         strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
 848
 849         return 0;
 850 }
 851
 852 static int amc6821_probe(
 853         struct i2c_client *client,
 854         const struct i2c_device_id *id)
 855 {
 856         struct amc6821_data *data;
 857         int err;
 858
 859         data = devm_kzalloc(&client->dev, sizeof(struct amc6821_data),
 860                             GFP_KERNEL);
 861         if (!data)
 862                 return -ENOMEM;
 863
 864         i2c_set_clientdata(client, data);
 865         mutex_init(&data->update_lock);
 866
 867         /*
 868          * Initialize the amc6821 chip
 869          */
 870         err = amc6821_init_client(client);
 871         if (err)
 872                 return err;
 873
 874         err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
 875         if (err)
 876                 return err;
 877
 878         data->hwmon_dev = hwmon_device_register(&client->dev);
 879         if (!IS_ERR(data->hwmon_dev))
 880                 return 0;
 881
 882         err = PTR_ERR(data->hwmon_dev);
 883         dev_err(&client->dev, "error registering hwmon device.\n");
 884         sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
 885         return err;
 886 }
 887
 888 static int amc6821_remove(struct i2c_client *client)
 889 {
 890         struct amc6821_data *data = i2c_get_clientdata(client);
 891
 892         hwmon_device_unregister(data->hwmon_dev);
 893         sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
 894
 895         return 0;
 896 }
 897
 898
 899 static int amc6821_init_client(struct i2c_client *client)
 900 {
 901         int config;
 902         int err = -EIO;
 903
 904         if (init) {
 905                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 906
 907                 if (config < 0) {
 908                                 dev_err(&client->dev,
 909                         "Error reading configuration register, aborting.\n");
 910                                 return err;
 911                 }
 912
 913                 config |= AMC6821_CONF4_MODE;
 914
 915                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
 916                                 config)) {
 917                         dev_err(&client->dev,
 918                         "Configuration register write error, aborting.\n");
 919                         return err;
 920                 }
 921
 922                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
 923
 924                 if (config < 0) {
 925                         dev_err(&client->dev,
 926                         "Error reading configuration register, aborting.\n");
 927                         return err;
 928                 }
 929
 930                 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
 931
 932                 config &= ~AMC6821_CONF3_THERM_FAN_EN;
 933
 934                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
 935                                 config)) {
 936                         dev_err(&client->dev,
 937                         "Configuration register write error, aborting.\n");
 938                         return err;
 939                 }
 940
 941                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
 942
 943                 if (config < 0) {
 944                         dev_err(&client->dev,
 945                         "Error reading configuration register, aborting.\n");
 946                         return err;
 947                 }
 948
 949                 config &= ~AMC6821_CONF2_RTFIE;
 950                 config &= ~AMC6821_CONF2_LTOIE;
 951                 config &= ~AMC6821_CONF2_RTOIE;
 952                 if (i2c_smbus_write_byte_data(client,
 953                                 AMC6821_REG_CONF2, config)) {
 954                         dev_err(&client->dev,
 955                         "Configuration register write error, aborting.\n");
 956                         return err;
 957                 }
 958
 959                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 960
 961                 if (config < 0) {
 962                         dev_err(&client->dev,
 963                         "Error reading configuration register, aborting.\n");
 964                         return err;
 965                 }
 966
 967                 config &= ~AMC6821_CONF1_THERMOVIE;
 968                 config &= ~AMC6821_CONF1_FANIE;
 969                 config |= AMC6821_CONF1_START;
 970                 if (pwminv)
 971                         config |= AMC6821_CONF1_PWMINV;
 972                 else
 973                         config &= ~AMC6821_CONF1_PWMINV;
 974
 975                 if (i2c_smbus_write_byte_data(
 976                                 client, AMC6821_REG_CONF1, config)) {
 977                         dev_err(&client->dev,
 978                         "Configuration register write error, aborting.\n");
 979                         return err;
 980                 }
 981         }
 982         return 0;
 983 }
 984
 985
 986 static struct amc6821_data *amc6821_update_device(struct device *dev)
 987 {
 988         struct i2c_client *client = to_i2c_client(dev);
 989         struct amc6821_data *data = i2c_get_clientdata(client);
 990         int timeout = HZ;
 991         u8 reg;
 992         int i;
 993
 994         mutex_lock(&data->update_lock);
 995
 996         if (time_after(jiffies, data->last_updated + timeout) ||
 997                         !data->valid) {
 998
 999                 for (i = 0; i < TEMP_IDX_LEN; i++)
1000                         data->temp[i] = i2c_smbus_read_byte_data(client,
1001                                 temp_reg[i]);
1002
1003                 data->stat1 = i2c_smbus_read_byte_data(client,
1004                         AMC6821_REG_STAT1);
1005                 data->stat2 = i2c_smbus_read_byte_data(client,
1006                         AMC6821_REG_STAT2);
1007
1008                 data->pwm1 = i2c_smbus_read_byte_data(client,
1009                         AMC6821_REG_DCY);
1010                 for (i = 0; i < FAN1_IDX_LEN; i++) {
1011                         data->fan[i] = i2c_smbus_read_byte_data(
1012                                         client,
1013                                         fan_reg_low[i]);
1014                         data->fan[i] += i2c_smbus_read_byte_data(
1015                                         client,
1016                                         fan_reg_hi[i]) << 8;
1017                 }
1018                 data->fan1_div = i2c_smbus_read_byte_data(client,
1019                         AMC6821_REG_CONF4);
1020                 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1021
1022                 data->pwm1_auto_point_pwm[0] = 0;
1023                 data->pwm1_auto_point_pwm[2] = 255;
1024                 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1025                         AMC6821_REG_DCY_LOW_TEMP);
1026
1027                 data->temp1_auto_point_temp[0] =
1028                         i2c_smbus_read_byte_data(client,
1029                                         AMC6821_REG_PSV_TEMP);
1030                 data->temp2_auto_point_temp[0] =
1031                                 data->temp1_auto_point_temp[0];
1032                 reg = i2c_smbus_read_byte_data(client,
1033                         AMC6821_REG_LTEMP_FAN_CTRL);
1034                 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1035                 reg &= 0x07;
1036                 reg = 0x20 >> reg;
1037                 if (reg > 0)
1038                         data->temp1_auto_point_temp[2] =
1039                                 data->temp1_auto_point_temp[1] +
1040                                 (data->pwm1_auto_point_pwm[2] -
1041                                 data->pwm1_auto_point_pwm[1]) / reg;
1042                 else
1043                         data->temp1_auto_point_temp[2] = 255;
1044
1045                 reg = i2c_smbus_read_byte_data(client,
1046                         AMC6821_REG_RTEMP_FAN_CTRL);
1047                 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1048                 reg &= 0x07;
1049                 reg = 0x20 >> reg;
1050                 if (reg > 0)
1051                         data->temp2_auto_point_temp[2] =
1052                                 data->temp2_auto_point_temp[1] +
1053                                 (data->pwm1_auto_point_pwm[2] -
1054                                 data->pwm1_auto_point_pwm[1]) / reg;
1055                 else
1056                         data->temp2_auto_point_temp[2] = 255;
1057
1058                 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1059                 reg = (reg >> 5) & 0x3;
1060                 switch (reg) {
1061                 case 0: /*open loop: software sets pwm1*/
1062                         data->pwm1_auto_channels_temp = 0;
1063                         data->pwm1_enable = 1;
1064                         break;
1065                 case 2: /*closed loop: remote T (temp2)*/
1066                         data->pwm1_auto_channels_temp = 2;
1067                         data->pwm1_enable = 2;
1068                         break;
1069                 case 3: /*closed loop: local and remote T (temp2)*/
1070                         data->pwm1_auto_channels_temp = 3;
1071                         data->pwm1_enable = 3;
1072                         break;
1073                 case 1: /*
1074                          * semi-open loop: software sets rpm, chip controls
1075                          * pwm1, currently not implemented
1076                          */
1077                         data->pwm1_auto_channels_temp = 0;
1078                         data->pwm1_enable = 0;
1079                         break;
1080                 }
1081
1082                 data->last_updated = jiffies;
1083                 data->valid = 1;
1084         }
1085         mutex_unlock(&data->update_lock);
1086         return data;
1087 }
1088
1089 module_i2c_driver(amc6821_driver);
1090
1091 MODULE_LICENSE("GPL");
1092 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1093 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");