drivers/hwmon/emc6w201.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
   4  * Copyright (C) 2011  Jean Delvare <jdelvare@suse.de>
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/slab.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/i2c.h>
  12 #include <linux/hwmon.h>
  13 #include <linux/hwmon-sysfs.h>
  14 #include <linux/err.h>
  15 #include <linux/mutex.h>
  16
  17 /*
  18  * Addresses to scan
  19  */
  20
  21 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  22
  23 /*
  24  * The EMC6W201 registers
  25  */
  26
  27 #define EMC6W201_REG_IN(nr)             (0x20 + (nr))
  28 #define EMC6W201_REG_TEMP(nr)           (0x26 + (nr))
  29 #define EMC6W201_REG_FAN(nr)            (0x2C + (nr) * 2)
  30 #define EMC6W201_REG_COMPANY            0x3E
  31 #define EMC6W201_REG_VERSTEP            0x3F
  32 #define EMC6W201_REG_CONFIG             0x40
  33 #define EMC6W201_REG_IN_LOW(nr)         (0x4A + (nr) * 2)
  34 #define EMC6W201_REG_IN_HIGH(nr)        (0x4B + (nr) * 2)
  35 #define EMC6W201_REG_TEMP_LOW(nr)       (0x56 + (nr) * 2)
  36 #define EMC6W201_REG_TEMP_HIGH(nr)      (0x57 + (nr) * 2)
  37 #define EMC6W201_REG_FAN_MIN(nr)        (0x62 + (nr) * 2)
  38
  39 enum subfeature { input, min, max };
  40
  41 /*
  42  * Per-device data
  43  */
  44
  45 struct emc6w201_data {
  46         struct i2c_client *client;
  47         struct mutex update_lock;
  48         char valid; /* zero until following fields are valid */
  49         unsigned long last_updated; /* in jiffies */
  50
  51         /* registers values */
  52         u8 in[3][6];
  53         s8 temp[3][6];
  54         u16 fan[2][5];
  55 };
  56
  57 /*
  58  * Combine LSB and MSB registers in a single value
  59  * Locking: must be called with data->update_lock held
  60  */
  61 static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
  62 {
  63         int lsb, msb;
  64
  65         lsb = i2c_smbus_read_byte_data(client, reg);
  66         msb = i2c_smbus_read_byte_data(client, reg + 1);
  67         if (unlikely(lsb < 0 || msb < 0)) {
  68                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
  69                         16, "read", reg);
  70                 return 0xFFFF;  /* Arbitrary value */
  71         }
  72
  73         return (msb << 8) | lsb;
  74 }
  75
  76 /*
  77  * Write 16-bit value to LSB and MSB registers
  78  * Locking: must be called with data->update_lock held
  79  */
  80 static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
  81 {
  82         int err;
  83
  84         err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
  85         if (likely(!err))
  86                 err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
  87         if (unlikely(err < 0))
  88                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
  89                         16, "write", reg);
  90
  91         return err;
  92 }
  93
  94 /* Read 8-bit value from register */
  95 static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
  96 {
  97         int val;
  98
  99         val = i2c_smbus_read_byte_data(client, reg);
 100         if (unlikely(val < 0)) {
 101                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
 102                         8, "read", reg);
 103                 return 0x00;    /* Arbitrary value */
 104         }
 105
 106         return val;
 107 }
 108
 109 /* Write 8-bit value to register */
 110 static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
 111 {
 112         int err;
 113
 114         err = i2c_smbus_write_byte_data(client, reg, val);
 115         if (unlikely(err < 0))
 116                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
 117                         8, "write", reg);
 118
 119         return err;
 120 }
 121
 122 static struct emc6w201_data *emc6w201_update_device(struct device *dev)
 123 {
 124         struct emc6w201_data *data = dev_get_drvdata(dev);
 125         struct i2c_client *client = data->client;
 126         int nr;
 127
 128         mutex_lock(&data->update_lock);
 129
 130         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 131                 for (nr = 0; nr < 6; nr++) {
 132                         data->in[input][nr] =
 133                                 emc6w201_read8(client,
 134                                                 EMC6W201_REG_IN(nr));
 135                         data->in[min][nr] =
 136                                 emc6w201_read8(client,
 137                                                 EMC6W201_REG_IN_LOW(nr));
 138                         data->in[max][nr] =
 139                                 emc6w201_read8(client,
 140                                                 EMC6W201_REG_IN_HIGH(nr));
 141                 }
 142
 143                 for (nr = 0; nr < 6; nr++) {
 144                         data->temp[input][nr] =
 145                                 emc6w201_read8(client,
 146                                                 EMC6W201_REG_TEMP(nr));
 147                         data->temp[min][nr] =
 148                                 emc6w201_read8(client,
 149                                                 EMC6W201_REG_TEMP_LOW(nr));
 150                         data->temp[max][nr] =
 151                                 emc6w201_read8(client,
 152                                                 EMC6W201_REG_TEMP_HIGH(nr));
 153                 }
 154
 155                 for (nr = 0; nr < 5; nr++) {
 156                         data->fan[input][nr] =
 157                                 emc6w201_read16(client,
 158                                                 EMC6W201_REG_FAN(nr));
 159                         data->fan[min][nr] =
 160                                 emc6w201_read16(client,
 161                                                 EMC6W201_REG_FAN_MIN(nr));
 162                 }
 163
 164                 data->last_updated = jiffies;
 165                 data->valid = 1;
 166         }
 167
 168         mutex_unlock(&data->update_lock);
 169
 170         return data;
 171 }
 172
 173 /*
 174  * Sysfs callback functions
 175  */
 176
 177 static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
 178
 179 static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
 180                        char *buf)
 181 {
 182         struct emc6w201_data *data = emc6w201_update_device(dev);
 183         int sf = to_sensor_dev_attr_2(devattr)->index;
 184         int nr = to_sensor_dev_attr_2(devattr)->nr;
 185
 186         return sprintf(buf, "%u\n",
 187                        (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
 188 }
 189
 190 static ssize_t in_store(struct device *dev, struct device_attribute *devattr,
 191                         const char *buf, size_t count)
 192 {
 193         struct emc6w201_data *data = dev_get_drvdata(dev);
 194         struct i2c_client *client = data->client;
 195         int sf = to_sensor_dev_attr_2(devattr)->index;
 196         int nr = to_sensor_dev_attr_2(devattr)->nr;
 197         int err;
 198         long val;
 199         u8 reg;
 200
 201         err = kstrtol(buf, 10, &val);
 202         if (err < 0)
 203                 return err;
 204
 205         val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
 206         val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
 207         reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
 208                           : EMC6W201_REG_IN_HIGH(nr);
 209
 210         mutex_lock(&data->update_lock);
 211         data->in[sf][nr] = val;
 212         err = emc6w201_write8(client, reg, data->in[sf][nr]);
 213         mutex_unlock(&data->update_lock);
 214
 215         return err < 0 ? err : count;
 216 }
 217
 218 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 219                          char *buf)
 220 {
 221         struct emc6w201_data *data = emc6w201_update_device(dev);
 222         int sf = to_sensor_dev_attr_2(devattr)->index;
 223         int nr = to_sensor_dev_attr_2(devattr)->nr;
 224
 225         return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
 226 }
 227
 228 static ssize_t temp_store(struct device *dev,
 229                           struct device_attribute *devattr, const char *buf,
 230                           size_t count)
 231 {
 232         struct emc6w201_data *data = dev_get_drvdata(dev);
 233         struct i2c_client *client = data->client;
 234         int sf = to_sensor_dev_attr_2(devattr)->index;
 235         int nr = to_sensor_dev_attr_2(devattr)->nr;
 236         int err;
 237         long val;
 238         u8 reg;
 239
 240         err = kstrtol(buf, 10, &val);
 241         if (err < 0)
 242                 return err;
 243
 244         val = clamp_val(val, -127000, 127000);
 245         val = DIV_ROUND_CLOSEST(val, 1000);
 246         reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
 247                           : EMC6W201_REG_TEMP_HIGH(nr);
 248
 249         mutex_lock(&data->update_lock);
 250         data->temp[sf][nr] = val;
 251         err = emc6w201_write8(client, reg, data->temp[sf][nr]);
 252         mutex_unlock(&data->update_lock);
 253
 254         return err < 0 ? err : count;
 255 }
 256
 257 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
 258                         char *buf)
 259 {
 260         struct emc6w201_data *data = emc6w201_update_device(dev);
 261         int sf = to_sensor_dev_attr_2(devattr)->index;
 262         int nr = to_sensor_dev_attr_2(devattr)->nr;
 263         unsigned rpm;
 264
 265         if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
 266                 rpm = 0;
 267         else
 268                 rpm = 5400000U / data->fan[sf][nr];
 269
 270         return sprintf(buf, "%u\n", rpm);
 271 }
 272
 273 static ssize_t fan_store(struct device *dev, struct device_attribute *devattr,
 274                          const char *buf, size_t count)
 275 {
 276         struct emc6w201_data *data = dev_get_drvdata(dev);
 277         struct i2c_client *client = data->client;
 278         int sf = to_sensor_dev_attr_2(devattr)->index;
 279         int nr = to_sensor_dev_attr_2(devattr)->nr;
 280         int err;
 281         unsigned long val;
 282
 283         err = kstrtoul(buf, 10, &val);
 284         if (err < 0)
 285                 return err;
 286
 287         if (val == 0) {
 288                 val = 0xFFFF;
 289         } else {
 290                 val = DIV_ROUND_CLOSEST(5400000U, val);
 291                 val = clamp_val(val, 0, 0xFFFE);
 292         }
 293
 294         mutex_lock(&data->update_lock);
 295         data->fan[sf][nr] = val;
 296         err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
 297                                data->fan[sf][nr]);
 298         mutex_unlock(&data->update_lock);
 299
 300         return err < 0 ? err : count;
 301 }
 302
 303 static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input);
 304 static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min);
 305 static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max);
 306 static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input);
 307 static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min);
 308 static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max);
 309 static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input);
 310 static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min);
 311 static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max);
 312 static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input);
 313 static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min);
 314 static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max);
 315 static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input);
 316 static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min);
 317 static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max);
 318 static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input);
 319 static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min);
 320 static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max);
 321
 322 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input);
 323 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min);
 324 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max);
 325 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input);
 326 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min);
 327 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max);
 328 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input);
 329 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min);
 330 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max);
 331 static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input);
 332 static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min);
 333 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max);
 334 static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input);
 335 static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min);
 336 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max);
 337 static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input);
 338 static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min);
 339 static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max);
 340
 341 static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input);
 342 static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min);
 343 static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input);
 344 static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min);
 345 static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input);
 346 static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min);
 347 static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input);
 348 static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min);
 349 static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input);
 350 static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min);
 351
 352 static struct attribute *emc6w201_attrs[] = {
 353         &sensor_dev_attr_in0_input.dev_attr.attr,
 354         &sensor_dev_attr_in0_min.dev_attr.attr,
 355         &sensor_dev_attr_in0_max.dev_attr.attr,
 356         &sensor_dev_attr_in1_input.dev_attr.attr,
 357         &sensor_dev_attr_in1_min.dev_attr.attr,
 358         &sensor_dev_attr_in1_max.dev_attr.attr,
 359         &sensor_dev_attr_in2_input.dev_attr.attr,
 360         &sensor_dev_attr_in2_min.dev_attr.attr,
 361         &sensor_dev_attr_in2_max.dev_attr.attr,
 362         &sensor_dev_attr_in3_input.dev_attr.attr,
 363         &sensor_dev_attr_in3_min.dev_attr.attr,
 364         &sensor_dev_attr_in3_max.dev_attr.attr,
 365         &sensor_dev_attr_in4_input.dev_attr.attr,
 366         &sensor_dev_attr_in4_min.dev_attr.attr,
 367         &sensor_dev_attr_in4_max.dev_attr.attr,
 368         &sensor_dev_attr_in5_input.dev_attr.attr,
 369         &sensor_dev_attr_in5_min.dev_attr.attr,
 370         &sensor_dev_attr_in5_max.dev_attr.attr,
 371
 372         &sensor_dev_attr_temp1_input.dev_attr.attr,
 373         &sensor_dev_attr_temp1_min.dev_attr.attr,
 374         &sensor_dev_attr_temp1_max.dev_attr.attr,
 375         &sensor_dev_attr_temp2_input.dev_attr.attr,
 376         &sensor_dev_attr_temp2_min.dev_attr.attr,
 377         &sensor_dev_attr_temp2_max.dev_attr.attr,
 378         &sensor_dev_attr_temp3_input.dev_attr.attr,
 379         &sensor_dev_attr_temp3_min.dev_attr.attr,
 380         &sensor_dev_attr_temp3_max.dev_attr.attr,
 381         &sensor_dev_attr_temp4_input.dev_attr.attr,
 382         &sensor_dev_attr_temp4_min.dev_attr.attr,
 383         &sensor_dev_attr_temp4_max.dev_attr.attr,
 384         &sensor_dev_attr_temp5_input.dev_attr.attr,
 385         &sensor_dev_attr_temp5_min.dev_attr.attr,
 386         &sensor_dev_attr_temp5_max.dev_attr.attr,
 387         &sensor_dev_attr_temp6_input.dev_attr.attr,
 388         &sensor_dev_attr_temp6_min.dev_attr.attr,
 389         &sensor_dev_attr_temp6_max.dev_attr.attr,
 390
 391         &sensor_dev_attr_fan1_input.dev_attr.attr,
 392         &sensor_dev_attr_fan1_min.dev_attr.attr,
 393         &sensor_dev_attr_fan2_input.dev_attr.attr,
 394         &sensor_dev_attr_fan2_min.dev_attr.attr,
 395         &sensor_dev_attr_fan3_input.dev_attr.attr,
 396         &sensor_dev_attr_fan3_min.dev_attr.attr,
 397         &sensor_dev_attr_fan4_input.dev_attr.attr,
 398         &sensor_dev_attr_fan4_min.dev_attr.attr,
 399         &sensor_dev_attr_fan5_input.dev_attr.attr,
 400         &sensor_dev_attr_fan5_min.dev_attr.attr,
 401         NULL
 402 };
 403
 404 ATTRIBUTE_GROUPS(emc6w201);
 405
 406 /*
 407  * Driver interface
 408  */
 409
 410 /* Return 0 if detection is successful, -ENODEV otherwise */
 411 static int emc6w201_detect(struct i2c_client *client,
 412                            struct i2c_board_info *info)
 413 {
 414         struct i2c_adapter *adapter = client->adapter;
 415         int company, verstep, config;
 416
 417         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 418                 return -ENODEV;
 419
 420         /* Identification */
 421         company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
 422         if (company != 0x5C)
 423                 return -ENODEV;
 424         verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
 425         if (verstep < 0 || (verstep & 0xF0) != 0xB0)
 426                 return -ENODEV;
 427         if ((verstep & 0x0F) > 2) {
 428                 dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n",
 429                         verstep & 0x0F);
 430                 return -ENODEV;
 431         }
 432
 433         /* Check configuration */
 434         config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
 435         if (config < 0 || (config & 0xF4) != 0x04)
 436                 return -ENODEV;
 437         if (!(config & 0x01)) {
 438                 dev_err(&client->dev, "Monitoring not enabled\n");
 439                 return -ENODEV;
 440         }
 441
 442         strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
 443
 444         return 0;
 445 }
 446
 447 static int emc6w201_probe(struct i2c_client *client,
 448                           const struct i2c_device_id *id)
 449 {
 450         struct device *dev = &client->dev;
 451         struct emc6w201_data *data;
 452         struct device *hwmon_dev;
 453
 454         data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
 455         if (!data)
 456                 return -ENOMEM;
 457
 458         data->client = client;
 459         mutex_init(&data->update_lock);
 460
 461         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 462                                                            data,
 463                                                            emc6w201_groups);
 464         return PTR_ERR_OR_ZERO(hwmon_dev);
 465 }
 466
 467 static const struct i2c_device_id emc6w201_id[] = {
 468         { "emc6w201", 0 },
 469         { }
 470 };
 471 MODULE_DEVICE_TABLE(i2c, emc6w201_id);
 472
 473 static struct i2c_driver emc6w201_driver = {
 474         .class          = I2C_CLASS_HWMON,
 475         .driver = {
 476                 .name   = "emc6w201",
 477         },
 478         .probe          = emc6w201_probe,
 479         .id_table       = emc6w201_id,
 480         .detect         = emc6w201_detect,
 481         .address_list   = normal_i2c,
 482 };
 483
 484 module_i2c_driver(emc6w201_driver);
 485
 486 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 487 MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
 488 MODULE_LICENSE("GPL");