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 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
 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        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
 429static 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
 440static 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
 464static 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
 531EXIT:
 532        mutex_unlock(&data->update_lock);
 533        return count;
 534}
 535
 536
 537
 538static 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
 572EXIT:
 573        data->valid = 0;
 574        mutex_unlock(&data->update_lock);
 575        return count;
 576}
 577
 578static 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
 592static 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
 606static 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        }
 633EXIT:
 634        mutex_unlock(&data->update_lock);
 635        return count;
 636}
 637
 638
 639
 640static 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
 649static 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        }
 686EXIT:
 687        mutex_unlock(&data->update_lock);
 688        return count;
 689}
 690
 691
 692
 693static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 694        get_temp, NULL, IDX_TEMP1_INPUT);
 695static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
 696        set_temp, IDX_TEMP1_MIN);
 697static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
 698        set_temp, IDX_TEMP1_MAX);
 699static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
 700        set_temp, IDX_TEMP1_CRIT);
 701static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
 702        get_temp_alarm, NULL, IDX_TEMP1_MIN);
 703static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
 704        get_temp_alarm, NULL, IDX_TEMP1_MAX);
 705static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
 706        get_temp_alarm, NULL, IDX_TEMP1_CRIT);
 707static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
 708        get_temp, NULL, IDX_TEMP2_INPUT);
 709static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
 710        set_temp, IDX_TEMP2_MIN);
 711static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
 712        set_temp, IDX_TEMP2_MAX);
 713static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
 714        set_temp, IDX_TEMP2_CRIT);
 715static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
 716        get_temp2_fault, NULL, 0);
 717static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
 718        get_temp_alarm, NULL, IDX_TEMP2_MIN);
 719static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
 720        get_temp_alarm, NULL, IDX_TEMP2_MAX);
 721static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
 722        get_temp_alarm, NULL, IDX_TEMP2_CRIT);
 723static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
 724static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 725        get_fan, set_fan, IDX_FAN1_MIN);
 726static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
 727        get_fan, set_fan, IDX_FAN1_MAX);
 728static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
 729static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 730        get_fan1_div, set_fan1_div, 0);
 731
 732static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
 733static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
 734        get_pwm1_enable, set_pwm1_enable, 0);
 735static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
 736        get_pwm1_auto_point_pwm, NULL, 0);
 737static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
 738        get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
 739static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
 740        get_pwm1_auto_point_pwm, NULL, 2);
 741static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
 742        get_pwm1_auto_channels_temp, NULL, 0);
 743static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
 744        get_temp_auto_point_temp, NULL, 1, 0);
 745static 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);
 747static 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
 750static 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);
 752static 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);
 754static 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
 759static 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
 795static struct attribute_group amc6821_attr_grp = {
 796        .attrs = amc6821_attrs,
 797};
 798
 799
 800
 801/* Return 0 if detection is successful, -ENODEV otherwise */
 802static 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
 847static 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
 883static 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
 894static 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
 981static 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
1084module_i2c_driver(amc6821_driver);
1085
1086MODULE_LICENSE("GPL");
1087MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1088MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
1089
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