drivers/hwmon/nct7904.c

   1 /*
   2  * nct7904.c - driver for Nuvoton NCT7904D.
   3  *
   4  * Copyright (c) 2015 Kontron
   5  * Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/device.h>
  20 #include <linux/init.h>
  21 #include <linux/i2c.h>
  22 #include <linux/mutex.h>
  23 #include <linux/hwmon.h>
  24
  25 #define VENDOR_ID_REG           0x7A    /* Any bank */
  26 #define NUVOTON_ID              0x50
  27 #define CHIP_ID_REG             0x7B    /* Any bank */
  28 #define NCT7904_ID              0xC5
  29 #define DEVICE_ID_REG           0x7C    /* Any bank */
  30
  31 #define BANK_SEL_REG            0xFF
  32 #define BANK_0                  0x00
  33 #define BANK_1                  0x01
  34 #define BANK_2                  0x02
  35 #define BANK_3                  0x03
  36 #define BANK_4                  0x04
  37 #define BANK_MAX                0x04
  38
  39 #define FANIN_MAX               12      /* Counted from 1 */
  40 #define VSEN_MAX                21      /* VSEN1..14, 3VDD, VBAT, V3VSB,
  41                                            LTD (not a voltage), VSEN17..19 */
  42 #define FANCTL_MAX              4       /* Counted from 1 */
  43 #define TCPU_MAX                8       /* Counted from 1 */
  44 #define TEMP_MAX                4       /* Counted from 1 */
  45
  46 #define VT_ADC_CTRL0_REG        0x20    /* Bank 0 */
  47 #define VT_ADC_CTRL1_REG        0x21    /* Bank 0 */
  48 #define VT_ADC_CTRL2_REG        0x22    /* Bank 0 */
  49 #define FANIN_CTRL0_REG         0x24
  50 #define FANIN_CTRL1_REG         0x25
  51 #define DTS_T_CTRL0_REG         0x26
  52 #define DTS_T_CTRL1_REG         0x27
  53 #define VT_ADC_MD_REG           0x2E
  54
  55 #define VSEN1_HV_REG            0x40    /* Bank 0; 2 regs (HV/LV) per sensor */
  56 #define TEMP_CH1_HV_REG         0x42    /* Bank 0; same as VSEN2_HV */
  57 #define LTD_HV_REG              0x62    /* Bank 0; 2 regs in VSEN range */
  58 #define FANIN1_HV_REG           0x80    /* Bank 0; 2 regs (HV/LV) per sensor */
  59 #define T_CPU1_HV_REG           0xA0    /* Bank 0; 2 regs (HV/LV) per sensor */
  60
  61 #define PRTS_REG                0x03    /* Bank 2 */
  62 #define FANCTL1_FMR_REG         0x00    /* Bank 3; 1 reg per channel */
  63 #define FANCTL1_OUT_REG         0x10    /* Bank 3; 1 reg per channel */
  64
  65 static const unsigned short normal_i2c[] = {
  66         0x2d, 0x2e, I2C_CLIENT_END
  67 };
  68
  69 struct nct7904_data {
  70         struct i2c_client *client;
  71         struct mutex bank_lock;
  72         int bank_sel;
  73         u32 fanin_mask;
  74         u32 vsen_mask;
  75         u32 tcpu_mask;
  76         u8 fan_mode[FANCTL_MAX];
  77 };
  78
  79 /* Access functions */
  80 static int nct7904_bank_lock(struct nct7904_data *data, unsigned bank)
  81 {
  82         int ret;
  83
  84         mutex_lock(&data->bank_lock);
  85         if (data->bank_sel == bank)
  86                 return 0;
  87         ret = i2c_smbus_write_byte_data(data->client, BANK_SEL_REG, bank);
  88         if (ret == 0)
  89                 data->bank_sel = bank;
  90         else
  91                 data->bank_sel = -1;
  92         return ret;
  93 }
  94
  95 static inline void nct7904_bank_release(struct nct7904_data *data)
  96 {
  97         mutex_unlock(&data->bank_lock);
  98 }
  99
 100 /* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
 101 static int nct7904_read_reg(struct nct7904_data *data,
 102                             unsigned bank, unsigned reg)
 103 {
 104         struct i2c_client *client = data->client;
 105         int ret;
 106
 107         ret = nct7904_bank_lock(data, bank);
 108         if (ret == 0)
 109                 ret = i2c_smbus_read_byte_data(client, reg);
 110
 111         nct7904_bank_release(data);
 112         return ret;
 113 }
 114
 115 /*
 116  * Read 2-byte register. Returns register in big-endian format or
 117  * -ERRNO on error.
 118  */
 119 static int nct7904_read_reg16(struct nct7904_data *data,
 120                               unsigned bank, unsigned reg)
 121 {
 122         struct i2c_client *client = data->client;
 123         int ret, hi;
 124
 125         ret = nct7904_bank_lock(data, bank);
 126         if (ret == 0) {
 127                 ret = i2c_smbus_read_byte_data(client, reg);
 128                 if (ret >= 0) {
 129                         hi = ret;
 130                         ret = i2c_smbus_read_byte_data(client, reg + 1);
 131                         if (ret >= 0)
 132                                 ret |= hi << 8;
 133                 }
 134         }
 135
 136         nct7904_bank_release(data);
 137         return ret;
 138 }
 139
 140 /* Write 1-byte register. Returns 0 or -ERRNO on error. */
 141 static int nct7904_write_reg(struct nct7904_data *data,
 142                              unsigned bank, unsigned reg, u8 val)
 143 {
 144         struct i2c_client *client = data->client;
 145         int ret;
 146
 147         ret = nct7904_bank_lock(data, bank);
 148         if (ret == 0)
 149                 ret = i2c_smbus_write_byte_data(client, reg, val);
 150
 151         nct7904_bank_release(data);
 152         return ret;
 153 }
 154
 155 static int nct7904_read_fan(struct device *dev, u32 attr, int channel,
 156                             long *val)
 157 {
 158         struct nct7904_data *data = dev_get_drvdata(dev);
 159         unsigned int cnt, rpm;
 160         int ret;
 161
 162         switch(attr) {
 163         case hwmon_fan_input:
 164                 ret = nct7904_read_reg16(data, BANK_0,
 165                                          FANIN1_HV_REG + channel * 2);
 166                 if (ret < 0)
 167                         return ret;
 168                 cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
 169                 if (cnt == 0x1fff)
 170                         rpm = 0;
 171                 else
 172                         rpm = 1350000 / cnt;
 173                 *val = rpm;
 174                 return 0;
 175         default:
 176                 return -EOPNOTSUPP;
 177         }
 178 }
 179
 180 static umode_t nct7904_fan_is_visible(const void *_data, u32 attr, int channel)
 181 {
 182         const struct nct7904_data *data = _data;
 183
 184         if (attr == hwmon_fan_input && data->fanin_mask & (1 << channel))
 185                 return S_IRUGO;
 186         return 0;
 187 }
 188
 189 static u8 nct7904_chan_to_index[] = {
 190         0,      /* Not used */
 191         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
 192         18, 19, 20, 16
 193 };
 194
 195 static int nct7904_read_in(struct device *dev, u32 attr, int channel,
 196                            long *val)
 197 {
 198         struct nct7904_data *data = dev_get_drvdata(dev);
 199         int ret, volt, index;
 200
 201         index = nct7904_chan_to_index[channel];
 202
 203         switch(attr) {
 204         case hwmon_in_input:
 205                 ret = nct7904_read_reg16(data, BANK_0,
 206                                          VSEN1_HV_REG + index * 2);
 207                 if (ret < 0)
 208                         return ret;
 209                 volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
 210                 if (index < 14)
 211                         volt *= 2; /* 0.002V scale */
 212                 else
 213                         volt *= 6; /* 0.006V scale */
 214                 *val = volt;
 215                 return 0;
 216         default:
 217                 return -EOPNOTSUPP;
 218         }
 219 }
 220
 221 static umode_t nct7904_in_is_visible(const void *_data, u32 attr, int channel)
 222 {
 223         const struct nct7904_data *data = _data;
 224         int index = nct7904_chan_to_index[channel];
 225
 226         if (channel > 0 && attr == hwmon_in_input &&
 227             (data->vsen_mask & BIT(index)))
 228                 return S_IRUGO;
 229
 230         return 0;
 231 }
 232
 233 static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
 234                              long *val)
 235 {
 236         struct nct7904_data *data = dev_get_drvdata(dev);
 237         int ret, temp;
 238
 239         switch(attr) {
 240         case hwmon_temp_input:
 241                 if (channel == 0)
 242                         ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
 243                 else
 244                         ret = nct7904_read_reg16(data, BANK_0,
 245                                         T_CPU1_HV_REG + (channel - 1) * 2);
 246                 if (ret < 0)
 247                         return ret;
 248                 temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
 249                 *val = sign_extend32(temp, 10) * 125;
 250                 return 0;
 251         default:
 252                 return -EOPNOTSUPP;
 253         }
 254 }
 255
 256 static umode_t nct7904_temp_is_visible(const void *_data, u32 attr, int channel)
 257 {
 258         const struct nct7904_data *data = _data;
 259
 260         if (attr == hwmon_temp_input) {
 261                 if (channel == 0) {
 262                         if (data->vsen_mask & BIT(17))
 263                                 return S_IRUGO;
 264                 } else {
 265                         if (data->tcpu_mask & BIT(channel - 1))
 266                                 return S_IRUGO;
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int nct7904_read_pwm(struct device *dev, u32 attr, int channel,
 274                             long *val)
 275 {
 276         struct nct7904_data *data = dev_get_drvdata(dev);
 277         int ret;
 278
 279         switch(attr) {
 280         case hwmon_pwm_input:
 281                 ret = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + channel);
 282                 if (ret < 0)
 283                         return ret;
 284                 *val = ret;
 285                 return 0;
 286         case hwmon_pwm_enable:
 287                 ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + channel);
 288                 if (ret < 0)
 289                         return ret;
 290
 291                 *val = ret ? 2 : 1;
 292                 return 0;
 293         default:
 294                 return -EOPNOTSUPP;
 295         }
 296 }
 297
 298 static int nct7904_write_pwm(struct device *dev, u32 attr, int channel,
 299                              long val)
 300 {
 301         struct nct7904_data *data = dev_get_drvdata(dev);
 302         int ret;
 303
 304         switch(attr) {
 305         case hwmon_pwm_input:
 306                 if (val < 0 || val > 255)
 307                         return -EINVAL;
 308                 ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + channel,
 309                                         val);
 310                 return ret;
 311         case hwmon_pwm_enable:
 312                 if (val < 1 || val > 2 ||
 313                     (val == 2 && !data->fan_mode[channel]))
 314                         return -EINVAL;
 315                 ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + channel,
 316                                         val == 2 ? data->fan_mode[channel] : 0);
 317                 return ret;
 318         default:
 319                 return -EOPNOTSUPP;
 320         }
 321 }
 322
 323 static umode_t nct7904_pwm_is_visible(const void *_data, u32 attr, int channel)
 324 {
 325         switch(attr) {
 326         case hwmon_pwm_input:
 327         case hwmon_pwm_enable:
 328                 return S_IRUGO | S_IWUSR;
 329         default:
 330                 return 0;
 331         }
 332 }
 333
 334 static int nct7904_read(struct device *dev, enum hwmon_sensor_types type,
 335                         u32 attr, int channel, long *val)
 336 {
 337         switch (type) {
 338         case hwmon_in:
 339                 return nct7904_read_in(dev, attr, channel, val);
 340         case hwmon_fan:
 341                 return nct7904_read_fan(dev, attr, channel, val);
 342         case hwmon_pwm:
 343                 return nct7904_read_pwm(dev, attr, channel, val);
 344         case hwmon_temp:
 345                 return nct7904_read_temp(dev, attr, channel, val);
 346         default:
 347                 return -EOPNOTSUPP;
 348         }
 349 }
 350
 351 static int nct7904_write(struct device *dev, enum hwmon_sensor_types type,
 352                          u32 attr, int channel, long val)
 353 {
 354         switch (type) {
 355         case hwmon_pwm:
 356                 return nct7904_write_pwm(dev, attr, channel, val);
 357         default:
 358                 return -EOPNOTSUPP;
 359         }
 360 }
 361
 362 static umode_t nct7904_is_visible(const void *data,
 363                                   enum hwmon_sensor_types type,
 364                                   u32 attr, int channel)
 365 {
 366         switch (type) {
 367         case hwmon_in:
 368                 return nct7904_in_is_visible(data, attr, channel);
 369         case hwmon_fan:
 370                 return nct7904_fan_is_visible(data, attr, channel);
 371         case hwmon_pwm:
 372                 return nct7904_pwm_is_visible(data, attr, channel);
 373         case hwmon_temp:
 374                 return nct7904_temp_is_visible(data, attr, channel);
 375         default:
 376                 return 0;
 377         }
 378 }
 379
 380 /* Return 0 if detection is successful, -ENODEV otherwise */
 381 static int nct7904_detect(struct i2c_client *client,
 382                           struct i2c_board_info *info)
 383 {
 384         struct i2c_adapter *adapter = client->adapter;
 385
 386         if (!i2c_check_functionality(adapter,
 387                                      I2C_FUNC_SMBUS_READ_BYTE |
 388                                      I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 389                 return -ENODEV;
 390
 391         /* Determine the chip type. */
 392         if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID ||
 393             i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID ||
 394             (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 ||
 395             (i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00)
 396                 return -ENODEV;
 397
 398         strlcpy(info->type, "nct7904", I2C_NAME_SIZE);
 399
 400         return 0;
 401 }
 402
 403 static const u32 nct7904_in_config[] = {
 404         HWMON_I_INPUT,                  /* dummy, skipped in is_visible */
 405         HWMON_I_INPUT,
 406         HWMON_I_INPUT,
 407         HWMON_I_INPUT,
 408         HWMON_I_INPUT,
 409         HWMON_I_INPUT,
 410         HWMON_I_INPUT,
 411         HWMON_I_INPUT,
 412         HWMON_I_INPUT,
 413         HWMON_I_INPUT,
 414         HWMON_I_INPUT,
 415         HWMON_I_INPUT,
 416         HWMON_I_INPUT,
 417         HWMON_I_INPUT,
 418         HWMON_I_INPUT,
 419         HWMON_I_INPUT,
 420         HWMON_I_INPUT,
 421         HWMON_I_INPUT,
 422         HWMON_I_INPUT,
 423         HWMON_I_INPUT,
 424         HWMON_I_INPUT,
 425         0
 426 };
 427
 428 static const struct hwmon_channel_info nct7904_in = {
 429         .type = hwmon_in,
 430         .config = nct7904_in_config,
 431 };
 432
 433 static const u32 nct7904_fan_config[] = {
 434             HWMON_F_INPUT,
 435             HWMON_F_INPUT,
 436             HWMON_F_INPUT,
 437             HWMON_F_INPUT,
 438             HWMON_F_INPUT,
 439             HWMON_F_INPUT,
 440             HWMON_F_INPUT,
 441             HWMON_F_INPUT,
 442             0
 443 };
 444
 445 static const struct hwmon_channel_info nct7904_fan = {
 446         .type = hwmon_fan,
 447         .config = nct7904_fan_config,
 448 };
 449
 450 static const u32 nct7904_pwm_config[] = {
 451             HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
 452             HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
 453             HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
 454             HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
 455             0
 456 };
 457
 458 static const struct hwmon_channel_info nct7904_pwm = {
 459         .type = hwmon_pwm,
 460         .config = nct7904_pwm_config,
 461 };
 462
 463 static const u32 nct7904_temp_config[] = {
 464             HWMON_T_INPUT,
 465             HWMON_T_INPUT,
 466             HWMON_T_INPUT,
 467             HWMON_T_INPUT,
 468             HWMON_T_INPUT,
 469             HWMON_T_INPUT,
 470             HWMON_T_INPUT,
 471             HWMON_T_INPUT,
 472             HWMON_T_INPUT,
 473             0
 474 };
 475
 476 static const struct hwmon_channel_info nct7904_temp = {
 477         .type = hwmon_temp,
 478         .config = nct7904_temp_config,
 479 };
 480
 481 static const struct hwmon_channel_info *nct7904_info[] = {
 482         &nct7904_in,
 483         &nct7904_fan,
 484         &nct7904_pwm,
 485         &nct7904_temp,
 486         NULL
 487 };
 488
 489 static const struct hwmon_ops nct7904_hwmon_ops = {
 490         .is_visible = nct7904_is_visible,
 491         .read = nct7904_read,
 492         .write = nct7904_write,
 493 };
 494
 495 static const struct hwmon_chip_info nct7904_chip_info = {
 496         .ops = &nct7904_hwmon_ops,
 497         .info = nct7904_info,
 498 };
 499
 500 static int nct7904_probe(struct i2c_client *client,
 501                          const struct i2c_device_id *id)
 502 {
 503         struct nct7904_data *data;
 504         struct device *hwmon_dev;
 505         struct device *dev = &client->dev;
 506         int ret, i;
 507         u32 mask;
 508
 509         data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL);
 510         if (!data)
 511                 return -ENOMEM;
 512
 513         data->client = client;
 514         mutex_init(&data->bank_lock);
 515         data->bank_sel = -1;
 516
 517         /* Setup sensor groups. */
 518         /* FANIN attributes */
 519         ret = nct7904_read_reg16(data, BANK_0, FANIN_CTRL0_REG);
 520         if (ret < 0)
 521                 return ret;
 522         data->fanin_mask = (ret >> 8) | ((ret & 0xff) << 8);
 523
 524         /*
 525          * VSEN attributes
 526          *
 527          * Note: voltage sensors overlap with external temperature
 528          * sensors. So, if we ever decide to support the latter
 529          * we will have to adjust 'vsen_mask' accordingly.
 530          */
 531         mask = 0;
 532         ret = nct7904_read_reg16(data, BANK_0, VT_ADC_CTRL0_REG);
 533         if (ret >= 0)
 534                 mask = (ret >> 8) | ((ret & 0xff) << 8);
 535         ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
 536         if (ret >= 0)
 537                 mask |= (ret << 16);
 538         data->vsen_mask = mask;
 539
 540         /* CPU_TEMP attributes */
 541         ret = nct7904_read_reg16(data, BANK_0, DTS_T_CTRL0_REG);
 542         if (ret < 0)
 543                 return ret;
 544         data->tcpu_mask = ((ret >> 8) & 0xf) | ((ret & 0xf) << 4);
 545
 546         for (i = 0; i < FANCTL_MAX; i++) {
 547                 ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i);
 548                 if (ret < 0)
 549                         return ret;
 550                 data->fan_mode[i] = ret;
 551         }
 552
 553         hwmon_dev =
 554                 devm_hwmon_device_register_with_info(dev, client->name, data,
 555                                                      &nct7904_chip_info, NULL);
 556         return PTR_ERR_OR_ZERO(hwmon_dev);
 557 }
 558
 559 static const struct i2c_device_id nct7904_id[] = {
 560         {"nct7904", 0},
 561         {}
 562 };
 563 MODULE_DEVICE_TABLE(i2c, nct7904_id);
 564
 565 static struct i2c_driver nct7904_driver = {
 566         .class = I2C_CLASS_HWMON,
 567         .driver = {
 568                 .name = "nct7904",
 569         },
 570         .probe = nct7904_probe,
 571         .id_table = nct7904_id,
 572         .detect = nct7904_detect,
 573         .address_list = normal_i2c,
 574 };
 575
 576 module_i2c_driver(nct7904_driver);
 577
 578 MODULE_AUTHOR("Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>");
 579 MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
 580 MODULE_LICENSE("GPL");