drivers/hwmon/adm1021.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
   4  *             monitoring
   5  * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
   6  *                           Philip Edelbrock <phil@netroedge.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/i2c.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/hwmon-sysfs.h>
  16 #include <linux/err.h>
  17 #include <linux/mutex.h>
  18
  19
  20 /* Addresses to scan */
  21 static const unsigned short normal_i2c[] = {
  22         0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
  23
  24 enum chips {
  25         adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
  26
  27 /* adm1021 constants specified below */
  28
  29 /* The adm1021 registers */
  30 /* Read-only */
  31 /* For nr in 0-1 */
  32 #define ADM1021_REG_TEMP(nr)            (nr)
  33 #define ADM1021_REG_STATUS              0x02
  34 /* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
  35 #define ADM1021_REG_MAN_ID              0xFE
  36 /* ADM1021 = 0x0X, ADM1023 = 0x3X */
  37 #define ADM1021_REG_DEV_ID              0xFF
  38 /* These use different addresses for reading/writing */
  39 #define ADM1021_REG_CONFIG_R            0x03
  40 #define ADM1021_REG_CONFIG_W            0x09
  41 #define ADM1021_REG_CONV_RATE_R         0x04
  42 #define ADM1021_REG_CONV_RATE_W         0x0A
  43 /* These are for the ADM1023's additional precision on the remote temp sensor */
  44 #define ADM1023_REG_REM_TEMP_PREC       0x10
  45 #define ADM1023_REG_REM_OFFSET          0x11
  46 #define ADM1023_REG_REM_OFFSET_PREC     0x12
  47 #define ADM1023_REG_REM_TOS_PREC        0x13
  48 #define ADM1023_REG_REM_THYST_PREC      0x14
  49 /* limits */
  50 /* For nr in 0-1 */
  51 #define ADM1021_REG_TOS_R(nr)           (0x05 + 2 * (nr))
  52 #define ADM1021_REG_TOS_W(nr)           (0x0B + 2 * (nr))
  53 #define ADM1021_REG_THYST_R(nr)         (0x06 + 2 * (nr))
  54 #define ADM1021_REG_THYST_W(nr)         (0x0C + 2 * (nr))
  55 /* write-only */
  56 #define ADM1021_REG_ONESHOT             0x0F
  57
  58 /* Initial values */
  59
  60 /*
  61  * Note: Even though I left the low and high limits named os and hyst,
  62  * they don't quite work like a thermostat the way the LM75 does.  I.e.,
  63  * a lower temp than THYST actually triggers an alarm instead of
  64  * clearing it.  Weird, ey?   --Phil
  65  */
  66
  67 /* Each client has this additional data */
  68 struct adm1021_data {
  69         struct i2c_client *client;
  70         enum chips type;
  71
  72         const struct attribute_group *groups[3];
  73
  74         struct mutex update_lock;
  75         char valid;             /* !=0 if following fields are valid */
  76         char low_power;         /* !=0 if device in low power mode */
  77         unsigned long last_updated;     /* In jiffies */
  78
  79         int temp_max[2];                /* Register values */
  80         int temp_min[2];
  81         int temp[2];
  82         u8 alarms;
  83         /* Special values for ADM1023 only */
  84         u8 remote_temp_offset;
  85         u8 remote_temp_offset_prec;
  86 };
  87
  88 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
  89 static bool read_only;
  90
  91 static struct adm1021_data *adm1021_update_device(struct device *dev)
  92 {
  93         struct adm1021_data *data = dev_get_drvdata(dev);
  94         struct i2c_client *client = data->client;
  95
  96         mutex_lock(&data->update_lock);
  97
  98         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
  99             || !data->valid) {
 100                 int i;
 101
 102                 dev_dbg(dev, "Starting adm1021 update\n");
 103
 104                 for (i = 0; i < 2; i++) {
 105                         data->temp[i] = 1000 *
 106                                 (s8) i2c_smbus_read_byte_data(
 107                                         client, ADM1021_REG_TEMP(i));
 108                         data->temp_max[i] = 1000 *
 109                                 (s8) i2c_smbus_read_byte_data(
 110                                         client, ADM1021_REG_TOS_R(i));
 111                         if (data->type != lm84) {
 112                                 data->temp_min[i] = 1000 *
 113                                   (s8) i2c_smbus_read_byte_data(client,
 114                                                         ADM1021_REG_THYST_R(i));
 115                         }
 116                 }
 117                 data->alarms = i2c_smbus_read_byte_data(client,
 118                                                 ADM1021_REG_STATUS) & 0x7c;
 119                 if (data->type == adm1023) {
 120                         /*
 121                          * The ADM1023 provides 3 extra bits of precision for
 122                          * the remote sensor in extra registers.
 123                          */
 124                         data->temp[1] += 125 * (i2c_smbus_read_byte_data(
 125                                 client, ADM1023_REG_REM_TEMP_PREC) >> 5);
 126                         data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
 127                                 client, ADM1023_REG_REM_TOS_PREC) >> 5);
 128                         data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
 129                                 client, ADM1023_REG_REM_THYST_PREC) >> 5);
 130                         data->remote_temp_offset =
 131                                 i2c_smbus_read_byte_data(client,
 132                                                 ADM1023_REG_REM_OFFSET);
 133                         data->remote_temp_offset_prec =
 134                                 i2c_smbus_read_byte_data(client,
 135                                                 ADM1023_REG_REM_OFFSET_PREC);
 136                 }
 137                 data->last_updated = jiffies;
 138                 data->valid = 1;
 139         }
 140
 141         mutex_unlock(&data->update_lock);
 142
 143         return data;
 144 }
 145
 146 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 147                          char *buf)
 148 {
 149         int index = to_sensor_dev_attr(devattr)->index;
 150         struct adm1021_data *data = adm1021_update_device(dev);
 151
 152         return sprintf(buf, "%d\n", data->temp[index]);
 153 }
 154
 155 static ssize_t temp_max_show(struct device *dev,
 156                              struct device_attribute *devattr, char *buf)
 157 {
 158         int index = to_sensor_dev_attr(devattr)->index;
 159         struct adm1021_data *data = adm1021_update_device(dev);
 160
 161         return sprintf(buf, "%d\n", data->temp_max[index]);
 162 }
 163
 164 static ssize_t temp_min_show(struct device *dev,
 165                              struct device_attribute *devattr, char *buf)
 166 {
 167         int index = to_sensor_dev_attr(devattr)->index;
 168         struct adm1021_data *data = adm1021_update_device(dev);
 169
 170         return sprintf(buf, "%d\n", data->temp_min[index]);
 171 }
 172
 173 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 174                           char *buf)
 175 {
 176         int index = to_sensor_dev_attr(attr)->index;
 177         struct adm1021_data *data = adm1021_update_device(dev);
 178         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 179 }
 180
 181 static ssize_t alarms_show(struct device *dev,
 182                            struct device_attribute *attr,
 183                            char *buf)
 184 {
 185         struct adm1021_data *data = adm1021_update_device(dev);
 186         return sprintf(buf, "%u\n", data->alarms);
 187 }
 188
 189 static ssize_t temp_max_store(struct device *dev,
 190                               struct device_attribute *devattr,
 191                               const char *buf, size_t count)
 192 {
 193         int index = to_sensor_dev_attr(devattr)->index;
 194         struct adm1021_data *data = dev_get_drvdata(dev);
 195         struct i2c_client *client = data->client;
 196         long temp;
 197         int reg_val, err;
 198
 199         err = kstrtol(buf, 10, &temp);
 200         if (err)
 201                 return err;
 202         temp /= 1000;
 203
 204         mutex_lock(&data->update_lock);
 205         reg_val = clamp_val(temp, -128, 127);
 206         data->temp_max[index] = reg_val * 1000;
 207         if (!read_only)
 208                 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
 209                                           reg_val);
 210         mutex_unlock(&data->update_lock);
 211
 212         return count;
 213 }
 214
 215 static ssize_t temp_min_store(struct device *dev,
 216                               struct device_attribute *devattr,
 217                               const char *buf, size_t count)
 218 {
 219         int index = to_sensor_dev_attr(devattr)->index;
 220         struct adm1021_data *data = dev_get_drvdata(dev);
 221         struct i2c_client *client = data->client;
 222         long temp;
 223         int reg_val, err;
 224
 225         err = kstrtol(buf, 10, &temp);
 226         if (err)
 227                 return err;
 228         temp /= 1000;
 229
 230         mutex_lock(&data->update_lock);
 231         reg_val = clamp_val(temp, -128, 127);
 232         data->temp_min[index] = reg_val * 1000;
 233         if (!read_only)
 234                 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
 235                                           reg_val);
 236         mutex_unlock(&data->update_lock);
 237
 238         return count;
 239 }
 240
 241 static ssize_t low_power_show(struct device *dev,
 242                               struct device_attribute *devattr, char *buf)
 243 {
 244         struct adm1021_data *data = adm1021_update_device(dev);
 245         return sprintf(buf, "%d\n", data->low_power);
 246 }
 247
 248 static ssize_t low_power_store(struct device *dev,
 249                                struct device_attribute *devattr,
 250                                const char *buf, size_t count)
 251 {
 252         struct adm1021_data *data = dev_get_drvdata(dev);
 253         struct i2c_client *client = data->client;
 254         char low_power;
 255         unsigned long val;
 256         int err;
 257
 258         err = kstrtoul(buf, 10, &val);
 259         if (err)
 260                 return err;
 261         low_power = val != 0;
 262
 263         mutex_lock(&data->update_lock);
 264         if (low_power != data->low_power) {
 265                 int config = i2c_smbus_read_byte_data(
 266                         client, ADM1021_REG_CONFIG_R);
 267                 data->low_power = low_power;
 268                 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
 269                         (config & 0xBF) | (low_power << 6));
 270         }
 271         mutex_unlock(&data->update_lock);
 272
 273         return count;
 274 }
 275
 276
 277 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 278 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
 279 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
 280 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 281 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
 282 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
 283 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
 284 static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 5);
 285 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
 286 static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
 287 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
 288
 289 static DEVICE_ATTR_RO(alarms);
 290 static DEVICE_ATTR_RW(low_power);
 291
 292 static struct attribute *adm1021_attributes[] = {
 293         &sensor_dev_attr_temp1_max.dev_attr.attr,
 294         &sensor_dev_attr_temp1_input.dev_attr.attr,
 295         &sensor_dev_attr_temp2_max.dev_attr.attr,
 296         &sensor_dev_attr_temp2_input.dev_attr.attr,
 297         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 298         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 299         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 300         &dev_attr_alarms.attr,
 301         &dev_attr_low_power.attr,
 302         NULL
 303 };
 304
 305 static const struct attribute_group adm1021_group = {
 306         .attrs = adm1021_attributes,
 307 };
 308
 309 static struct attribute *adm1021_min_attributes[] = {
 310         &sensor_dev_attr_temp1_min.dev_attr.attr,
 311         &sensor_dev_attr_temp2_min.dev_attr.attr,
 312         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 313         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 314         NULL
 315 };
 316
 317 static const struct attribute_group adm1021_min_group = {
 318         .attrs = adm1021_min_attributes,
 319 };
 320
 321 /* Return 0 if detection is successful, -ENODEV otherwise */
 322 static int adm1021_detect(struct i2c_client *client,
 323                           struct i2c_board_info *info)
 324 {
 325         struct i2c_adapter *adapter = client->adapter;
 326         const char *type_name;
 327         int conv_rate, status, config, man_id, dev_id;
 328
 329         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 330                 pr_debug("detect failed, smbus byte data not supported!\n");
 331                 return -ENODEV;
 332         }
 333
 334         status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
 335         conv_rate = i2c_smbus_read_byte_data(client,
 336                                              ADM1021_REG_CONV_RATE_R);
 337         config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
 338
 339         /* Check unused bits */
 340         if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
 341                 pr_debug("detect failed, chip not detected!\n");
 342                 return -ENODEV;
 343         }
 344
 345         /* Determine the chip type. */
 346         man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
 347         dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
 348
 349         if (man_id < 0 || dev_id < 0)
 350                 return -ENODEV;
 351
 352         if (man_id == 0x4d && dev_id == 0x01)
 353                 type_name = "max1617a";
 354         else if (man_id == 0x41) {
 355                 if ((dev_id & 0xF0) == 0x30)
 356                         type_name = "adm1023";
 357                 else if ((dev_id & 0xF0) == 0x00)
 358                         type_name = "adm1021";
 359                 else
 360                         return -ENODEV;
 361         } else if (man_id == 0x49)
 362                 type_name = "thmc10";
 363         else if (man_id == 0x23)
 364                 type_name = "gl523sm";
 365         else if (man_id == 0x54)
 366                 type_name = "mc1066";
 367         else {
 368                 int lte, rte, lhi, rhi, llo, rlo;
 369
 370                 /* extra checks for LM84 and MAX1617 to avoid misdetections */
 371
 372                 llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
 373                 rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
 374
 375                 /* fail if any of the additional register reads failed */
 376                 if (llo < 0 || rlo < 0)
 377                         return -ENODEV;
 378
 379                 lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
 380                 rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
 381                 lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
 382                 rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
 383
 384                 /*
 385                  * Fail for negative temperatures and negative high limits.
 386                  * This check also catches read errors on the tested registers.
 387                  */
 388                 if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
 389                         return -ENODEV;
 390
 391                 /* fail if all registers hold the same value */
 392                 if (lte == rte && lte == lhi && lte == rhi && lte == llo
 393                     && lte == rlo)
 394                         return -ENODEV;
 395
 396                 /*
 397                  * LM84 Mfr ID is in a different place,
 398                  * and it has more unused bits.
 399                  */
 400                 if (conv_rate == 0x00
 401                     && (config & 0x7F) == 0x00
 402                     && (status & 0xAB) == 0x00) {
 403                         type_name = "lm84";
 404                 } else {
 405                         /* fail if low limits are larger than high limits */
 406                         if ((s8)llo > lhi || (s8)rlo > rhi)
 407                                 return -ENODEV;
 408                         type_name = "max1617";
 409                 }
 410         }
 411
 412         pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
 413                  type_name, i2c_adapter_id(adapter), client->addr);
 414         strlcpy(info->type, type_name, I2C_NAME_SIZE);
 415
 416         return 0;
 417 }
 418
 419 static void adm1021_init_client(struct i2c_client *client)
 420 {
 421         /* Enable ADC and disable suspend mode */
 422         i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
 423                 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
 424         /* Set Conversion rate to 1/sec (this can be tinkered with) */
 425         i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
 426 }
 427
 428 static int adm1021_probe(struct i2c_client *client,
 429                          const struct i2c_device_id *id)
 430 {
 431         struct device *dev = &client->dev;
 432         struct adm1021_data *data;
 433         struct device *hwmon_dev;
 434
 435         data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
 436         if (!data)
 437                 return -ENOMEM;
 438
 439         data->client = client;
 440         data->type = id->driver_data;
 441         mutex_init(&data->update_lock);
 442
 443         /* Initialize the ADM1021 chip */
 444         if (data->type != lm84 && !read_only)
 445                 adm1021_init_client(client);
 446
 447         data->groups[0] = &adm1021_group;
 448         if (data->type != lm84)
 449                 data->groups[1] = &adm1021_min_group;
 450
 451         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 452                                                            data, data->groups);
 453
 454         return PTR_ERR_OR_ZERO(hwmon_dev);
 455 }
 456
 457 static const struct i2c_device_id adm1021_id[] = {
 458         { "adm1021", adm1021 },
 459         { "adm1023", adm1023 },
 460         { "max1617", max1617 },
 461         { "max1617a", max1617a },
 462         { "thmc10", thmc10 },
 463         { "lm84", lm84 },
 464         { "gl523sm", gl523sm },
 465         { "mc1066", mc1066 },
 466         { }
 467 };
 468 MODULE_DEVICE_TABLE(i2c, adm1021_id);
 469
 470 static struct i2c_driver adm1021_driver = {
 471         .class          = I2C_CLASS_HWMON,
 472         .driver = {
 473                 .name   = "adm1021",
 474         },
 475         .probe          = adm1021_probe,
 476         .id_table       = adm1021_id,
 477         .detect         = adm1021_detect,
 478         .address_list   = normal_i2c,
 479 };
 480
 481 module_i2c_driver(adm1021_driver);
 482
 483 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 484                 "Philip Edelbrock <phil@netroedge.com>");
 485 MODULE_DESCRIPTION("adm1021 driver");
 486 MODULE_LICENSE("GPL");
 487
 488 module_param(read_only, bool, 0);
 489 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");