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