linux/drivers/hwmon/amc6821.c
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   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
  41static 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
  50static int pwminv;      /*Inverted PWM output. */
  51module_param(pwminv, int, S_IRUGO);
  52
  53static int init = 1; /*Power-on initialization.*/
  54module_param(init, int, S_IRUGO);
  55
  56
  57enum 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
 129enum {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
 134static 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
 143enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
 144        FAN1_IDX_LEN, };
 145
 146static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
 147                        AMC6821_REG_TACH_LLIMITL,
 148                        AMC6821_REG_TACH_HLIMITL, };
 149
 150
 151static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
 152                        AMC6821_REG_TACH_LLIMITH,
 153                        AMC6821_REG_TACH_HLIMITH, };
 154
 155static int amc6821_probe(
 156                struct i2c_client *client,
 157                const struct i2c_device_id *id);
 158static int amc6821_detect(
 159                struct i2c_client *client,
 160                struct i2c_board_info *info);
 161static int amc6821_init_client(struct i2c_client *client);
 162static int amc6821_remove(struct i2c_client *client);
 163static struct amc6821_data *amc6821_update_device(struct device *dev);
 164
 165/*
 166 * Driver data (common to all clients)
 167 */
 168
 169static const struct i2c_device_id amc6821_id[] = {
 170        { "amc6821", amc6821 },
 171        { }
 172};
 173
 174MODULE_DEVICE_TABLE(i2c, amc6821_id);
 175
 176static 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
 193struct 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
 217static 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
 230static 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
 259static 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
 300static 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
 312static 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
 321static 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
 341static 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
 350static 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
 397static 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
 407static 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
 431static 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
 442static 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
 466static 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
 534EXIT:
 535        mutex_unlock(&data->update_lock);
 536        return count;
 537}
 538
 539
 540
 541static 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
 575EXIT:
 576        data->valid = 0;
 577        mutex_unlock(&data->update_lock);
 578        return count;
 579}
 580
 581static 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
 595static 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
 609static 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        }
 636EXIT:
 637        mutex_unlock(&data->update_lock);
 638        return count;
 639}
 640
 641
 642
 643static 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
 652static 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        }
 689EXIT:
 690        mutex_unlock(&data->update_lock);
 691        return count;
 692}
 693
 694
 695
 696static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 697        get_temp, NULL, IDX_TEMP1_INPUT);
 698static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
 699        set_temp, IDX_TEMP1_MIN);
 700static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
 701        set_temp, IDX_TEMP1_MAX);
 702static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
 703        set_temp, IDX_TEMP1_CRIT);
 704static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
 705        get_temp_alarm, NULL, IDX_TEMP1_MIN);
 706static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
 707        get_temp_alarm, NULL, IDX_TEMP1_MAX);
 708static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
 709        get_temp_alarm, NULL, IDX_TEMP1_CRIT);
 710static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
 711        get_temp, NULL, IDX_TEMP2_INPUT);
 712static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
 713        set_temp, IDX_TEMP2_MIN);
 714static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
 715        set_temp, IDX_TEMP2_MAX);
 716static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
 717        set_temp, IDX_TEMP2_CRIT);
 718static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
 719        get_temp2_fault, NULL, 0);
 720static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
 721        get_temp_alarm, NULL, IDX_TEMP2_MIN);
 722static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
 723        get_temp_alarm, NULL, IDX_TEMP2_MAX);
 724static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
 725        get_temp_alarm, NULL, IDX_TEMP2_CRIT);
 726static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
 727static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 728        get_fan, set_fan, IDX_FAN1_MIN);
 729static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
 730        get_fan, set_fan, IDX_FAN1_MAX);
 731static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
 732static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 733        get_fan1_div, set_fan1_div, 0);
 734
 735static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
 736static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
 737        get_pwm1_enable, set_pwm1_enable, 0);
 738static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
 739        get_pwm1_auto_point_pwm, NULL, 0);
 740static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
 741        get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
 742static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
 743        get_pwm1_auto_point_pwm, NULL, 2);
 744static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
 745        get_pwm1_auto_channels_temp, NULL, 0);
 746static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
 747        get_temp_auto_point_temp, NULL, 1, 0);
 748static 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);
 750static 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
 753static 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);
 755static 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);
 757static 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
 762static 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
 798static struct attribute_group amc6821_attr_grp = {
 799        .attrs = amc6821_attrs,
 800};
 801
 802
 803
 804/* Return 0 if detection is successful, -ENODEV otherwise */
 805static 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
 850static 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
 886static 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
 897static 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
 984static 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
1087module_i2c_driver(amc6821_driver);
1088
1089MODULE_LICENSE("GPL");
1090MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1091MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
1092
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