1 /* 2 * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201 3 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/slab.h> 23 #include <linux/jiffies.h> 24 #include <linux/i2c.h> 25 #include <linux/hwmon.h> 26 #include <linux/hwmon-sysfs.h> 27 #include <linux/err.h> 28 #include <linux/mutex.h> 29 30 /* 31 * Addresses to scan 32 */ 33 34 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 35 36 /* 37 * The EMC6W201 registers 38 */ 39 40 #define EMC6W201_REG_IN(nr) (0x20 + (nr)) 41 #define EMC6W201_REG_TEMP(nr) (0x26 + (nr)) 42 #define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2) 43 #define EMC6W201_REG_COMPANY 0x3E 44 #define EMC6W201_REG_VERSTEP 0x3F 45 #define EMC6W201_REG_CONFIG 0x40 46 #define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2) 47 #define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2) 48 #define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2) 49 #define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2) 50 #define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2) 51 52 enum subfeature { input, min, max }; 53 54 /* 55 * Per-device data 56 */ 57 58 struct emc6w201_data { 59 struct i2c_client *client; 60 struct mutex update_lock; 61 char valid; /* zero until following fields are valid */ 62 unsigned long last_updated; /* in jiffies */ 63 64 /* registers values */ 65 u8 in[3][6]; 66 s8 temp[3][6]; 67 u16 fan[2][5]; 68 }; 69 70 /* 71 * Combine LSB and MSB registers in a single value 72 * Locking: must be called with data->update_lock held 73 */ 74 static u16 emc6w201_read16(struct i2c_client *client, u8 reg) 75 { 76 int lsb, msb; 77 78 lsb = i2c_smbus_read_byte_data(client, reg); 79 msb = i2c_smbus_read_byte_data(client, reg + 1); 80 if (unlikely(lsb < 0 || msb < 0)) { 81 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 82 16, "read", reg); 83 return 0xFFFF; /* Arbitrary value */ 84 } 85 86 return (msb << 8) | lsb; 87 } 88 89 /* 90 * Write 16-bit value to LSB and MSB registers 91 * Locking: must be called with data->update_lock held 92 */ 93 static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val) 94 { 95 int err; 96 97 err = i2c_smbus_write_byte_data(client, reg, val & 0xff); 98 if (likely(!err)) 99 err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8); 100 if (unlikely(err < 0)) 101 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 102 16, "write", reg); 103 104 return err; 105 } 106 107 /* Read 8-bit value from register */ 108 static u8 emc6w201_read8(struct i2c_client *client, u8 reg) 109 { 110 int val; 111 112 val = i2c_smbus_read_byte_data(client, reg); 113 if (unlikely(val < 0)) { 114 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 115 8, "read", reg); 116 return 0x00; /* Arbitrary value */ 117 } 118 119 return val; 120 } 121 122 /* Write 8-bit value to register */ 123 static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val) 124 { 125 int err; 126 127 err = i2c_smbus_write_byte_data(client, reg, val); 128 if (unlikely(err < 0)) 129 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 130 8, "write", reg); 131 132 return err; 133 } 134 135 static struct emc6w201_data *emc6w201_update_device(struct device *dev) 136 { 137 struct emc6w201_data *data = dev_get_drvdata(dev); 138 struct i2c_client *client = data->client; 139 int nr; 140 141 mutex_lock(&data->update_lock); 142 143 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 144 for (nr = 0; nr < 6; nr++) { 145 data->in[input][nr] = 146 emc6w201_read8(client, 147 EMC6W201_REG_IN(nr)); 148 data->in[min][nr] = 149 emc6w201_read8(client, 150 EMC6W201_REG_IN_LOW(nr)); 151 data->in[max][nr] = 152 emc6w201_read8(client, 153 EMC6W201_REG_IN_HIGH(nr)); 154 } 155 156 for (nr = 0; nr < 6; nr++) { 157 data->temp[input][nr] = 158 emc6w201_read8(client, 159 EMC6W201_REG_TEMP(nr)); 160 data->temp[min][nr] = 161 emc6w201_read8(client, 162 EMC6W201_REG_TEMP_LOW(nr)); 163 data->temp[max][nr] = 164 emc6w201_read8(client, 165 EMC6W201_REG_TEMP_HIGH(nr)); 166 } 167 168 for (nr = 0; nr < 5; nr++) { 169 data->fan[input][nr] = 170 emc6w201_read16(client, 171 EMC6W201_REG_FAN(nr)); 172 data->fan[min][nr] = 173 emc6w201_read16(client, 174 EMC6W201_REG_FAN_MIN(nr)); 175 } 176 177 data->last_updated = jiffies; 178 data->valid = 1; 179 } 180 181 mutex_unlock(&data->update_lock); 182 183 return data; 184 } 185 186 /* 187 * Sysfs callback functions 188 */ 189 190 static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 }; 191 192 static ssize_t show_in(struct device *dev, struct device_attribute *devattr, 193 char *buf) 194 { 195 struct emc6w201_data *data = emc6w201_update_device(dev); 196 int sf = to_sensor_dev_attr_2(devattr)->index; 197 int nr = to_sensor_dev_attr_2(devattr)->nr; 198 199 return sprintf(buf, "%u\n", 200 (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0); 201 } 202 203 static ssize_t set_in(struct device *dev, struct device_attribute *devattr, 204 const char *buf, size_t count) 205 { 206 struct emc6w201_data *data = dev_get_drvdata(dev); 207 struct i2c_client *client = data->client; 208 int sf = to_sensor_dev_attr_2(devattr)->index; 209 int nr = to_sensor_dev_attr_2(devattr)->nr; 210 int err; 211 long val; 212 u8 reg; 213 214 err = kstrtol(buf, 10, &val); 215 if (err < 0) 216 return err; 217 218 val = DIV_ROUND_CLOSEST(val * 0xC0, nominal_mv[nr]); 219 reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr) 220 : EMC6W201_REG_IN_HIGH(nr); 221 222 mutex_lock(&data->update_lock); 223 data->in[sf][nr] = clamp_val(val, 0, 255); 224 err = emc6w201_write8(client, reg, data->in[sf][nr]); 225 mutex_unlock(&data->update_lock); 226 227 return err < 0 ? err : count; 228 } 229 230 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, 231 char *buf) 232 { 233 struct emc6w201_data *data = emc6w201_update_device(dev); 234 int sf = to_sensor_dev_attr_2(devattr)->index; 235 int nr = to_sensor_dev_attr_2(devattr)->nr; 236 237 return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000); 238 } 239 240 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, 241 const char *buf, size_t count) 242 { 243 struct emc6w201_data *data = dev_get_drvdata(dev); 244 struct i2c_client *client = data->client; 245 int sf = to_sensor_dev_attr_2(devattr)->index; 246 int nr = to_sensor_dev_attr_2(devattr)->nr; 247 int err; 248 long val; 249 u8 reg; 250 251 err = kstrtol(buf, 10, &val); 252 if (err < 0) 253 return err; 254 255 val = DIV_ROUND_CLOSEST(val, 1000); 256 reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr) 257 : EMC6W201_REG_TEMP_HIGH(nr); 258 259 mutex_lock(&data->update_lock); 260 data->temp[sf][nr] = clamp_val(val, -127, 127); 261 err = emc6w201_write8(client, reg, data->temp[sf][nr]); 262 mutex_unlock(&data->update_lock); 263 264 return err < 0 ? err : count; 265 } 266 267 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr, 268 char *buf) 269 { 270 struct emc6w201_data *data = emc6w201_update_device(dev); 271 int sf = to_sensor_dev_attr_2(devattr)->index; 272 int nr = to_sensor_dev_attr_2(devattr)->nr; 273 unsigned rpm; 274 275 if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF) 276 rpm = 0; 277 else 278 rpm = 5400000U / data->fan[sf][nr]; 279 280 return sprintf(buf, "%u\n", rpm); 281 } 282 283 static ssize_t set_fan(struct device *dev, struct device_attribute *devattr, 284 const char *buf, size_t count) 285 { 286 struct emc6w201_data *data = dev_get_drvdata(dev); 287 struct i2c_client *client = data->client; 288 int sf = to_sensor_dev_attr_2(devattr)->index; 289 int nr = to_sensor_dev_attr_2(devattr)->nr; 290 int err; 291 unsigned long val; 292 293 err = kstrtoul(buf, 10, &val); 294 if (err < 0) 295 return err; 296 297 if (val == 0) { 298 val = 0xFFFF; 299 } else { 300 val = DIV_ROUND_CLOSEST(5400000U, val); 301 val = clamp_val(val, 0, 0xFFFE); 302 } 303 304 mutex_lock(&data->update_lock); 305 data->fan[sf][nr] = val; 306 err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr), 307 data->fan[sf][nr]); 308 mutex_unlock(&data->update_lock); 309 310 return err < 0 ? err : count; 311 } 312 313 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, input); 314 static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in, 315 0, min); 316 static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in, 317 0, max); 318 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input); 319 static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in, 320 1, min); 321 static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in, 322 1, max); 323 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input); 324 static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in, 325 2, min); 326 static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in, 327 2, max); 328 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input); 329 static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in, 330 3, min); 331 static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in, 332 3, max); 333 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input); 334 static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in, 335 4, min); 336 static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in, 337 4, max); 338 static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input); 339 static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in, 340 5, min); 341 static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in, 342 5, max); 343 344 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input); 345 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 346 0, min); 347 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 348 0, max); 349 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input); 350 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 351 1, min); 352 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 353 1, max); 354 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input); 355 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 356 2, min); 357 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 358 2, max); 359 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input); 360 static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 361 3, min); 362 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 363 3, max); 364 static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input); 365 static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 366 4, min); 367 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 368 4, max); 369 static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input); 370 static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 371 5, min); 372 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 373 5, max); 374 375 static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input); 376 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan, 377 0, min); 378 static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input); 379 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan, 380 1, min); 381 static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input); 382 static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan, 383 2, min); 384 static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input); 385 static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan, 386 3, min); 387 static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input); 388 static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan, 389 4, min); 390 391 static struct attribute *emc6w201_attrs[] = { 392 &sensor_dev_attr_in0_input.dev_attr.attr, 393 &sensor_dev_attr_in0_min.dev_attr.attr, 394 &sensor_dev_attr_in0_max.dev_attr.attr, 395 &sensor_dev_attr_in1_input.dev_attr.attr, 396 &sensor_dev_attr_in1_min.dev_attr.attr, 397 &sensor_dev_attr_in1_max.dev_attr.attr, 398 &sensor_dev_attr_in2_input.dev_attr.attr, 399 &sensor_dev_attr_in2_min.dev_attr.attr, 400 &sensor_dev_attr_in2_max.dev_attr.attr, 401 &sensor_dev_attr_in3_input.dev_attr.attr, 402 &sensor_dev_attr_in3_min.dev_attr.attr, 403 &sensor_dev_attr_in3_max.dev_attr.attr, 404 &sensor_dev_attr_in4_input.dev_attr.attr, 405 &sensor_dev_attr_in4_min.dev_attr.attr, 406 &sensor_dev_attr_in4_max.dev_attr.attr, 407 &sensor_dev_attr_in5_input.dev_attr.attr, 408 &sensor_dev_attr_in5_min.dev_attr.attr, 409 &sensor_dev_attr_in5_max.dev_attr.attr, 410 411 &sensor_dev_attr_temp1_input.dev_attr.attr, 412 &sensor_dev_attr_temp1_min.dev_attr.attr, 413 &sensor_dev_attr_temp1_max.dev_attr.attr, 414 &sensor_dev_attr_temp2_input.dev_attr.attr, 415 &sensor_dev_attr_temp2_min.dev_attr.attr, 416 &sensor_dev_attr_temp2_max.dev_attr.attr, 417 &sensor_dev_attr_temp3_input.dev_attr.attr, 418 &sensor_dev_attr_temp3_min.dev_attr.attr, 419 &sensor_dev_attr_temp3_max.dev_attr.attr, 420 &sensor_dev_attr_temp4_input.dev_attr.attr, 421 &sensor_dev_attr_temp4_min.dev_attr.attr, 422 &sensor_dev_attr_temp4_max.dev_attr.attr, 423 &sensor_dev_attr_temp5_input.dev_attr.attr, 424 &sensor_dev_attr_temp5_min.dev_attr.attr, 425 &sensor_dev_attr_temp5_max.dev_attr.attr, 426 &sensor_dev_attr_temp6_input.dev_attr.attr, 427 &sensor_dev_attr_temp6_min.dev_attr.attr, 428 &sensor_dev_attr_temp6_max.dev_attr.attr, 429 430 &sensor_dev_attr_fan1_input.dev_attr.attr, 431 &sensor_dev_attr_fan1_min.dev_attr.attr, 432 &sensor_dev_attr_fan2_input.dev_attr.attr, 433 &sensor_dev_attr_fan2_min.dev_attr.attr, 434 &sensor_dev_attr_fan3_input.dev_attr.attr, 435 &sensor_dev_attr_fan3_min.dev_attr.attr, 436 &sensor_dev_attr_fan4_input.dev_attr.attr, 437 &sensor_dev_attr_fan4_min.dev_attr.attr, 438 &sensor_dev_attr_fan5_input.dev_attr.attr, 439 &sensor_dev_attr_fan5_min.dev_attr.attr, 440 NULL 441 }; 442 443 ATTRIBUTE_GROUPS(emc6w201); 444 445 /* 446 * Driver interface 447 */ 448 449 /* Return 0 if detection is successful, -ENODEV otherwise */ 450 static int emc6w201_detect(struct i2c_client *client, 451 struct i2c_board_info *info) 452 { 453 struct i2c_adapter *adapter = client->adapter; 454 int company, verstep, config; 455 456 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 457 return -ENODEV; 458 459 /* Identification */ 460 company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY); 461 if (company != 0x5C) 462 return -ENODEV; 463 verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP); 464 if (verstep < 0 || (verstep & 0xF0) != 0xB0) 465 return -ENODEV; 466 if ((verstep & 0x0F) > 2) { 467 dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n", 468 verstep & 0x0F); 469 return -ENODEV; 470 } 471 472 /* Check configuration */ 473 config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); 474 if (config < 0 || (config & 0xF4) != 0x04) 475 return -ENODEV; 476 if (!(config & 0x01)) { 477 dev_err(&client->dev, "Monitoring not enabled\n"); 478 return -ENODEV; 479 } 480 481 strlcpy(info->type, "emc6w201", I2C_NAME_SIZE); 482 483 return 0; 484 } 485 486 static int emc6w201_probe(struct i2c_client *client, 487 const struct i2c_device_id *id) 488 { 489 struct device *dev = &client->dev; 490 struct emc6w201_data *data; 491 struct device *hwmon_dev; 492 493 data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL); 494 if (!data) 495 return -ENOMEM; 496 497 data->client = client; 498 mutex_init(&data->update_lock); 499 500 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 501 data, 502 emc6w201_groups); 503 return PTR_ERR_OR_ZERO(hwmon_dev); 504 } 505 506 static const struct i2c_device_id emc6w201_id[] = { 507 { "emc6w201", 0 }, 508 { } 509 }; 510 MODULE_DEVICE_TABLE(i2c, emc6w201_id); 511 512 static struct i2c_driver emc6w201_driver = { 513 .class = I2C_CLASS_HWMON, 514 .driver = { 515 .name = "emc6w201", 516 }, 517 .probe = emc6w201_probe, 518 .id_table = emc6w201_id, 519 .detect = emc6w201_detect, 520 .address_list = normal_i2c, 521 }; 522 523 module_i2c_driver(emc6w201_driver); 524 525 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 526 MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); 527 MODULE_LICENSE("GPL"); 528