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 in_show(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 in_store(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 = clamp_val(val, 0, 255 * nominal_mv[nr] / 192); 219 val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]); 220 reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr) 221 : EMC6W201_REG_IN_HIGH(nr); 222 223 mutex_lock(&data->update_lock); 224 data->in[sf][nr] = val; 225 err = emc6w201_write8(client, reg, data->in[sf][nr]); 226 mutex_unlock(&data->update_lock); 227 228 return err < 0 ? err : count; 229 } 230 231 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 232 char *buf) 233 { 234 struct emc6w201_data *data = emc6w201_update_device(dev); 235 int sf = to_sensor_dev_attr_2(devattr)->index; 236 int nr = to_sensor_dev_attr_2(devattr)->nr; 237 238 return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000); 239 } 240 241 static ssize_t temp_store(struct device *dev, 242 struct device_attribute *devattr, const char *buf, 243 size_t count) 244 { 245 struct emc6w201_data *data = dev_get_drvdata(dev); 246 struct i2c_client *client = data->client; 247 int sf = to_sensor_dev_attr_2(devattr)->index; 248 int nr = to_sensor_dev_attr_2(devattr)->nr; 249 int err; 250 long val; 251 u8 reg; 252 253 err = kstrtol(buf, 10, &val); 254 if (err < 0) 255 return err; 256 257 val = clamp_val(val, -127000, 127000); 258 val = DIV_ROUND_CLOSEST(val, 1000); 259 reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr) 260 : EMC6W201_REG_TEMP_HIGH(nr); 261 262 mutex_lock(&data->update_lock); 263 data->temp[sf][nr] = val; 264 err = emc6w201_write8(client, reg, data->temp[sf][nr]); 265 mutex_unlock(&data->update_lock); 266 267 return err < 0 ? err : count; 268 } 269 270 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, 271 char *buf) 272 { 273 struct emc6w201_data *data = emc6w201_update_device(dev); 274 int sf = to_sensor_dev_attr_2(devattr)->index; 275 int nr = to_sensor_dev_attr_2(devattr)->nr; 276 unsigned rpm; 277 278 if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF) 279 rpm = 0; 280 else 281 rpm = 5400000U / data->fan[sf][nr]; 282 283 return sprintf(buf, "%u\n", rpm); 284 } 285 286 static ssize_t fan_store(struct device *dev, struct device_attribute *devattr, 287 const char *buf, size_t count) 288 { 289 struct emc6w201_data *data = dev_get_drvdata(dev); 290 struct i2c_client *client = data->client; 291 int sf = to_sensor_dev_attr_2(devattr)->index; 292 int nr = to_sensor_dev_attr_2(devattr)->nr; 293 int err; 294 unsigned long val; 295 296 err = kstrtoul(buf, 10, &val); 297 if (err < 0) 298 return err; 299 300 if (val == 0) { 301 val = 0xFFFF; 302 } else { 303 val = DIV_ROUND_CLOSEST(5400000U, val); 304 val = clamp_val(val, 0, 0xFFFE); 305 } 306 307 mutex_lock(&data->update_lock); 308 data->fan[sf][nr] = val; 309 err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr), 310 data->fan[sf][nr]); 311 mutex_unlock(&data->update_lock); 312 313 return err < 0 ? err : count; 314 } 315 316 static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input); 317 static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min); 318 static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max); 319 static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input); 320 static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min); 321 static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max); 322 static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input); 323 static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min); 324 static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max); 325 static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input); 326 static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min); 327 static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max); 328 static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input); 329 static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min); 330 static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max); 331 static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input); 332 static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min); 333 static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max); 334 335 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input); 336 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min); 337 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max); 338 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input); 339 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min); 340 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max); 341 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input); 342 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min); 343 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max); 344 static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input); 345 static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min); 346 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max); 347 static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input); 348 static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min); 349 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max); 350 static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input); 351 static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min); 352 static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max); 353 354 static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input); 355 static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min); 356 static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input); 357 static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min); 358 static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input); 359 static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min); 360 static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input); 361 static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min); 362 static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input); 363 static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min); 364 365 static struct attribute *emc6w201_attrs[] = { 366 &sensor_dev_attr_in0_input.dev_attr.attr, 367 &sensor_dev_attr_in0_min.dev_attr.attr, 368 &sensor_dev_attr_in0_max.dev_attr.attr, 369 &sensor_dev_attr_in1_input.dev_attr.attr, 370 &sensor_dev_attr_in1_min.dev_attr.attr, 371 &sensor_dev_attr_in1_max.dev_attr.attr, 372 &sensor_dev_attr_in2_input.dev_attr.attr, 373 &sensor_dev_attr_in2_min.dev_attr.attr, 374 &sensor_dev_attr_in2_max.dev_attr.attr, 375 &sensor_dev_attr_in3_input.dev_attr.attr, 376 &sensor_dev_attr_in3_min.dev_attr.attr, 377 &sensor_dev_attr_in3_max.dev_attr.attr, 378 &sensor_dev_attr_in4_input.dev_attr.attr, 379 &sensor_dev_attr_in4_min.dev_attr.attr, 380 &sensor_dev_attr_in4_max.dev_attr.attr, 381 &sensor_dev_attr_in5_input.dev_attr.attr, 382 &sensor_dev_attr_in5_min.dev_attr.attr, 383 &sensor_dev_attr_in5_max.dev_attr.attr, 384 385 &sensor_dev_attr_temp1_input.dev_attr.attr, 386 &sensor_dev_attr_temp1_min.dev_attr.attr, 387 &sensor_dev_attr_temp1_max.dev_attr.attr, 388 &sensor_dev_attr_temp2_input.dev_attr.attr, 389 &sensor_dev_attr_temp2_min.dev_attr.attr, 390 &sensor_dev_attr_temp2_max.dev_attr.attr, 391 &sensor_dev_attr_temp3_input.dev_attr.attr, 392 &sensor_dev_attr_temp3_min.dev_attr.attr, 393 &sensor_dev_attr_temp3_max.dev_attr.attr, 394 &sensor_dev_attr_temp4_input.dev_attr.attr, 395 &sensor_dev_attr_temp4_min.dev_attr.attr, 396 &sensor_dev_attr_temp4_max.dev_attr.attr, 397 &sensor_dev_attr_temp5_input.dev_attr.attr, 398 &sensor_dev_attr_temp5_min.dev_attr.attr, 399 &sensor_dev_attr_temp5_max.dev_attr.attr, 400 &sensor_dev_attr_temp6_input.dev_attr.attr, 401 &sensor_dev_attr_temp6_min.dev_attr.attr, 402 &sensor_dev_attr_temp6_max.dev_attr.attr, 403 404 &sensor_dev_attr_fan1_input.dev_attr.attr, 405 &sensor_dev_attr_fan1_min.dev_attr.attr, 406 &sensor_dev_attr_fan2_input.dev_attr.attr, 407 &sensor_dev_attr_fan2_min.dev_attr.attr, 408 &sensor_dev_attr_fan3_input.dev_attr.attr, 409 &sensor_dev_attr_fan3_min.dev_attr.attr, 410 &sensor_dev_attr_fan4_input.dev_attr.attr, 411 &sensor_dev_attr_fan4_min.dev_attr.attr, 412 &sensor_dev_attr_fan5_input.dev_attr.attr, 413 &sensor_dev_attr_fan5_min.dev_attr.attr, 414 NULL 415 }; 416 417 ATTRIBUTE_GROUPS(emc6w201); 418 419 /* 420 * Driver interface 421 */ 422 423 /* Return 0 if detection is successful, -ENODEV otherwise */ 424 static int emc6w201_detect(struct i2c_client *client, 425 struct i2c_board_info *info) 426 { 427 struct i2c_adapter *adapter = client->adapter; 428 int company, verstep, config; 429 430 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 431 return -ENODEV; 432 433 /* Identification */ 434 company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY); 435 if (company != 0x5C) 436 return -ENODEV; 437 verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP); 438 if (verstep < 0 || (verstep & 0xF0) != 0xB0) 439 return -ENODEV; 440 if ((verstep & 0x0F) > 2) { 441 dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n", 442 verstep & 0x0F); 443 return -ENODEV; 444 } 445 446 /* Check configuration */ 447 config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); 448 if (config < 0 || (config & 0xF4) != 0x04) 449 return -ENODEV; 450 if (!(config & 0x01)) { 451 dev_err(&client->dev, "Monitoring not enabled\n"); 452 return -ENODEV; 453 } 454 455 strlcpy(info->type, "emc6w201", I2C_NAME_SIZE); 456 457 return 0; 458 } 459 460 static int emc6w201_probe(struct i2c_client *client, 461 const struct i2c_device_id *id) 462 { 463 struct device *dev = &client->dev; 464 struct emc6w201_data *data; 465 struct device *hwmon_dev; 466 467 data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL); 468 if (!data) 469 return -ENOMEM; 470 471 data->client = client; 472 mutex_init(&data->update_lock); 473 474 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 475 data, 476 emc6w201_groups); 477 return PTR_ERR_OR_ZERO(hwmon_dev); 478 } 479 480 static const struct i2c_device_id emc6w201_id[] = { 481 { "emc6w201", 0 }, 482 { } 483 }; 484 MODULE_DEVICE_TABLE(i2c, emc6w201_id); 485 486 static struct i2c_driver emc6w201_driver = { 487 .class = I2C_CLASS_HWMON, 488 .driver = { 489 .name = "emc6w201", 490 }, 491 .probe = emc6w201_probe, 492 .id_table = emc6w201_id, 493 .detect = emc6w201_detect, 494 .address_list = normal_i2c, 495 }; 496 497 module_i2c_driver(emc6w201_driver); 498 499 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 500 MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); 501 MODULE_LICENSE("GPL"); 502