1 /* 2 * adm1025.c 3 * 4 * Copyright (C) 2000 Chen-Yuan Wu <gwu@esoft.com> 5 * Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de> 6 * 7 * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6 8 * voltages (including its own power source) and up to two temperatures 9 * (its own plus up to one external one). Voltages are scaled internally 10 * (which is not the common way) with ratios such that the nominal value 11 * of each voltage correspond to a register value of 192 (which means a 12 * resolution of about 0.5% of the nominal value). Temperature values are 13 * reported with a 1 deg resolution and a 3 deg accuracy. Complete 14 * datasheet can be obtained from Analog's website at: 15 * http://www.onsemi.com/PowerSolutions/product.do?id=ADM1025 16 * 17 * This driver also supports the ADM1025A, which differs from the ADM1025 18 * only in that it has "open-drain VID inputs while the ADM1025 has 19 * on-chip 100k pull-ups on the VID inputs". It doesn't make any 20 * difference for us. 21 * 22 * This driver also supports the NE1619, a sensor chip made by Philips. 23 * That chip is similar to the ADM1025A, with a few differences. The only 24 * difference that matters to us is that the NE1619 has only two possible 25 * addresses while the ADM1025A has a third one. Complete datasheet can be 26 * obtained from Philips's website at: 27 * http://www.semiconductors.philips.com/pip/NE1619DS.html 28 * 29 * Since the ADM1025 was the first chipset supported by this driver, most 30 * comments will refer to this chipset, but are actually general and 31 * concern all supported chipsets, unless mentioned otherwise. 32 * 33 * This program is free software; you can redistribute it and/or modify 34 * it under the terms of the GNU General Public License as published by 35 * the Free Software Foundation; either version 2 of the License, or 36 * (at your option) any later version. 37 * 38 * This program is distributed in the hope that it will be useful, 39 * but WITHOUT ANY WARRANTY; without even the implied warranty of 40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 41 * GNU General Public License for more details. 42 * 43 * You should have received a copy of the GNU General Public License 44 * along with this program; if not, write to the Free Software 45 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 46 */ 47 48 #include <linux/module.h> 49 #include <linux/init.h> 50 #include <linux/slab.h> 51 #include <linux/jiffies.h> 52 #include <linux/i2c.h> 53 #include <linux/hwmon.h> 54 #include <linux/hwmon-sysfs.h> 55 #include <linux/hwmon-vid.h> 56 #include <linux/err.h> 57 #include <linux/mutex.h> 58 59 /* 60 * Addresses to scan 61 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e. 62 * NE1619 has two possible addresses: 0x2c and 0x2d. 63 */ 64 65 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 66 67 enum chips { adm1025, ne1619 }; 68 69 /* 70 * The ADM1025 registers 71 */ 72 73 #define ADM1025_REG_MAN_ID 0x3E 74 #define ADM1025_REG_CHIP_ID 0x3F 75 #define ADM1025_REG_CONFIG 0x40 76 #define ADM1025_REG_STATUS1 0x41 77 #define ADM1025_REG_STATUS2 0x42 78 #define ADM1025_REG_IN(nr) (0x20 + (nr)) 79 #define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2) 80 #define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2) 81 #define ADM1025_REG_TEMP(nr) (0x26 + (nr)) 82 #define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2) 83 #define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2) 84 #define ADM1025_REG_VID 0x47 85 #define ADM1025_REG_VID4 0x49 86 87 /* 88 * Conversions and various macros 89 * The ADM1025 uses signed 8-bit values for temperatures. 90 */ 91 92 static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 }; 93 94 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192) 95 #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \ 96 (val) >= (scale) * 255 / 192 ? 255 : \ 97 ((val) * 192 + (scale) / 2) / (scale)) 98 99 #define TEMP_FROM_REG(reg) ((reg) * 1000) 100 #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ 101 (val) >= 126500 ? 127 : \ 102 (((val) < 0 ? (val) - 500 : \ 103 (val) + 500) / 1000)) 104 105 /* 106 * Client data (each client gets its own) 107 */ 108 109 struct adm1025_data { 110 struct i2c_client *client; 111 const struct attribute_group *groups[3]; 112 struct mutex update_lock; 113 char valid; /* zero until following fields are valid */ 114 unsigned long last_updated; /* in jiffies */ 115 116 u8 in[6]; /* register value */ 117 u8 in_max[6]; /* register value */ 118 u8 in_min[6]; /* register value */ 119 s8 temp[2]; /* register value */ 120 s8 temp_min[2]; /* register value */ 121 s8 temp_max[2]; /* register value */ 122 u16 alarms; /* register values, combined */ 123 u8 vid; /* register values, combined */ 124 u8 vrm; 125 }; 126 127 static struct adm1025_data *adm1025_update_device(struct device *dev) 128 { 129 struct adm1025_data *data = dev_get_drvdata(dev); 130 struct i2c_client *client = data->client; 131 132 mutex_lock(&data->update_lock); 133 134 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { 135 int i; 136 137 dev_dbg(&client->dev, "Updating data.\n"); 138 for (i = 0; i < 6; i++) { 139 data->in[i] = i2c_smbus_read_byte_data(client, 140 ADM1025_REG_IN(i)); 141 data->in_min[i] = i2c_smbus_read_byte_data(client, 142 ADM1025_REG_IN_MIN(i)); 143 data->in_max[i] = i2c_smbus_read_byte_data(client, 144 ADM1025_REG_IN_MAX(i)); 145 } 146 for (i = 0; i < 2; i++) { 147 data->temp[i] = i2c_smbus_read_byte_data(client, 148 ADM1025_REG_TEMP(i)); 149 data->temp_min[i] = i2c_smbus_read_byte_data(client, 150 ADM1025_REG_TEMP_LOW(i)); 151 data->temp_max[i] = i2c_smbus_read_byte_data(client, 152 ADM1025_REG_TEMP_HIGH(i)); 153 } 154 data->alarms = i2c_smbus_read_byte_data(client, 155 ADM1025_REG_STATUS1) 156 | (i2c_smbus_read_byte_data(client, 157 ADM1025_REG_STATUS2) << 8); 158 data->vid = (i2c_smbus_read_byte_data(client, 159 ADM1025_REG_VID) & 0x0f) 160 | ((i2c_smbus_read_byte_data(client, 161 ADM1025_REG_VID4) & 0x01) << 4); 162 163 data->last_updated = jiffies; 164 data->valid = 1; 165 } 166 167 mutex_unlock(&data->update_lock); 168 169 return data; 170 } 171 172 /* 173 * Sysfs stuff 174 */ 175 176 static ssize_t 177 show_in(struct device *dev, struct device_attribute *attr, char *buf) 178 { 179 int index = to_sensor_dev_attr(attr)->index; 180 struct adm1025_data *data = adm1025_update_device(dev); 181 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index], 182 in_scale[index])); 183 } 184 185 static ssize_t 186 show_in_min(struct device *dev, struct device_attribute *attr, char *buf) 187 { 188 int index = to_sensor_dev_attr(attr)->index; 189 struct adm1025_data *data = adm1025_update_device(dev); 190 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index], 191 in_scale[index])); 192 } 193 194 static ssize_t 195 show_in_max(struct device *dev, struct device_attribute *attr, char *buf) 196 { 197 int index = to_sensor_dev_attr(attr)->index; 198 struct adm1025_data *data = adm1025_update_device(dev); 199 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index], 200 in_scale[index])); 201 } 202 203 static ssize_t 204 show_temp(struct device *dev, struct device_attribute *attr, char *buf) 205 { 206 int index = to_sensor_dev_attr(attr)->index; 207 struct adm1025_data *data = adm1025_update_device(dev); 208 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index])); 209 } 210 211 static ssize_t 212 show_temp_min(struct device *dev, struct device_attribute *attr, char *buf) 213 { 214 int index = to_sensor_dev_attr(attr)->index; 215 struct adm1025_data *data = adm1025_update_device(dev); 216 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index])); 217 } 218 219 static ssize_t 220 show_temp_max(struct device *dev, struct device_attribute *attr, char *buf) 221 { 222 int index = to_sensor_dev_attr(attr)->index; 223 struct adm1025_data *data = adm1025_update_device(dev); 224 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index])); 225 } 226 227 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr, 228 const char *buf, size_t count) 229 { 230 int index = to_sensor_dev_attr(attr)->index; 231 struct adm1025_data *data = dev_get_drvdata(dev); 232 struct i2c_client *client = data->client; 233 long val; 234 int err; 235 236 err = kstrtol(buf, 10, &val); 237 if (err) 238 return err; 239 240 mutex_lock(&data->update_lock); 241 data->in_min[index] = IN_TO_REG(val, in_scale[index]); 242 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index), 243 data->in_min[index]); 244 mutex_unlock(&data->update_lock); 245 return count; 246 } 247 248 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr, 249 const char *buf, size_t count) 250 { 251 int index = to_sensor_dev_attr(attr)->index; 252 struct adm1025_data *data = dev_get_drvdata(dev); 253 struct i2c_client *client = data->client; 254 long val; 255 int err; 256 257 err = kstrtol(buf, 10, &val); 258 if (err) 259 return err; 260 261 mutex_lock(&data->update_lock); 262 data->in_max[index] = IN_TO_REG(val, in_scale[index]); 263 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index), 264 data->in_max[index]); 265 mutex_unlock(&data->update_lock); 266 return count; 267 } 268 269 #define set_in(offset) \ 270 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 271 show_in, NULL, offset); \ 272 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \ 273 show_in_min, set_in_min, offset); \ 274 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \ 275 show_in_max, set_in_max, offset) 276 set_in(0); 277 set_in(1); 278 set_in(2); 279 set_in(3); 280 set_in(4); 281 set_in(5); 282 283 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, 284 const char *buf, size_t count) 285 { 286 int index = to_sensor_dev_attr(attr)->index; 287 struct adm1025_data *data = dev_get_drvdata(dev); 288 struct i2c_client *client = data->client; 289 long val; 290 int err; 291 292 err = kstrtol(buf, 10, &val); 293 if (err) 294 return err; 295 296 mutex_lock(&data->update_lock); 297 data->temp_min[index] = TEMP_TO_REG(val); 298 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index), 299 data->temp_min[index]); 300 mutex_unlock(&data->update_lock); 301 return count; 302 } 303 304 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, 305 const char *buf, size_t count) 306 { 307 int index = to_sensor_dev_attr(attr)->index; 308 struct adm1025_data *data = dev_get_drvdata(dev); 309 struct i2c_client *client = data->client; 310 long val; 311 int err; 312 313 err = kstrtol(buf, 10, &val); 314 if (err) 315 return err; 316 317 mutex_lock(&data->update_lock); 318 data->temp_max[index] = TEMP_TO_REG(val); 319 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index), 320 data->temp_max[index]); 321 mutex_unlock(&data->update_lock); 322 return count; 323 } 324 325 #define set_temp(offset) \ 326 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ 327 show_temp, NULL, offset - 1); \ 328 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \ 329 show_temp_min, set_temp_min, offset - 1); \ 330 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \ 331 show_temp_max, set_temp_max, offset - 1) 332 set_temp(1); 333 set_temp(2); 334 335 static ssize_t 336 alarms_show(struct device *dev, struct device_attribute *attr, char *buf) 337 { 338 struct adm1025_data *data = adm1025_update_device(dev); 339 return sprintf(buf, "%u\n", data->alarms); 340 } 341 static DEVICE_ATTR_RO(alarms); 342 343 static ssize_t 344 show_alarm(struct device *dev, struct device_attribute *attr, char *buf) 345 { 346 int bitnr = to_sensor_dev_attr(attr)->index; 347 struct adm1025_data *data = adm1025_update_device(dev); 348 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 349 } 350 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 351 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 352 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 353 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 354 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 355 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 356 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5); 357 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4); 358 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14); 359 360 static ssize_t 361 cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf) 362 { 363 struct adm1025_data *data = adm1025_update_device(dev); 364 return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm)); 365 } 366 static DEVICE_ATTR_RO(cpu0_vid); 367 368 static ssize_t 369 vrm_show(struct device *dev, struct device_attribute *attr, char *buf) 370 { 371 struct adm1025_data *data = dev_get_drvdata(dev); 372 return sprintf(buf, "%u\n", data->vrm); 373 } 374 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 375 const char *buf, size_t count) 376 { 377 struct adm1025_data *data = dev_get_drvdata(dev); 378 unsigned long val; 379 int err; 380 381 err = kstrtoul(buf, 10, &val); 382 if (err) 383 return err; 384 385 if (val > 255) 386 return -EINVAL; 387 388 data->vrm = val; 389 return count; 390 } 391 static DEVICE_ATTR_RW(vrm); 392 393 /* 394 * Real code 395 */ 396 397 static struct attribute *adm1025_attributes[] = { 398 &sensor_dev_attr_in0_input.dev_attr.attr, 399 &sensor_dev_attr_in1_input.dev_attr.attr, 400 &sensor_dev_attr_in2_input.dev_attr.attr, 401 &sensor_dev_attr_in3_input.dev_attr.attr, 402 &sensor_dev_attr_in5_input.dev_attr.attr, 403 &sensor_dev_attr_in0_min.dev_attr.attr, 404 &sensor_dev_attr_in1_min.dev_attr.attr, 405 &sensor_dev_attr_in2_min.dev_attr.attr, 406 &sensor_dev_attr_in3_min.dev_attr.attr, 407 &sensor_dev_attr_in5_min.dev_attr.attr, 408 &sensor_dev_attr_in0_max.dev_attr.attr, 409 &sensor_dev_attr_in1_max.dev_attr.attr, 410 &sensor_dev_attr_in2_max.dev_attr.attr, 411 &sensor_dev_attr_in3_max.dev_attr.attr, 412 &sensor_dev_attr_in5_max.dev_attr.attr, 413 &sensor_dev_attr_in0_alarm.dev_attr.attr, 414 &sensor_dev_attr_in1_alarm.dev_attr.attr, 415 &sensor_dev_attr_in2_alarm.dev_attr.attr, 416 &sensor_dev_attr_in3_alarm.dev_attr.attr, 417 &sensor_dev_attr_in5_alarm.dev_attr.attr, 418 &sensor_dev_attr_temp1_input.dev_attr.attr, 419 &sensor_dev_attr_temp2_input.dev_attr.attr, 420 &sensor_dev_attr_temp1_min.dev_attr.attr, 421 &sensor_dev_attr_temp2_min.dev_attr.attr, 422 &sensor_dev_attr_temp1_max.dev_attr.attr, 423 &sensor_dev_attr_temp2_max.dev_attr.attr, 424 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 425 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 426 &sensor_dev_attr_temp1_fault.dev_attr.attr, 427 &dev_attr_alarms.attr, 428 &dev_attr_cpu0_vid.attr, 429 &dev_attr_vrm.attr, 430 NULL 431 }; 432 433 static const struct attribute_group adm1025_group = { 434 .attrs = adm1025_attributes, 435 }; 436 437 static struct attribute *adm1025_attributes_in4[] = { 438 &sensor_dev_attr_in4_input.dev_attr.attr, 439 &sensor_dev_attr_in4_min.dev_attr.attr, 440 &sensor_dev_attr_in4_max.dev_attr.attr, 441 &sensor_dev_attr_in4_alarm.dev_attr.attr, 442 NULL 443 }; 444 445 static const struct attribute_group adm1025_group_in4 = { 446 .attrs = adm1025_attributes_in4, 447 }; 448 449 /* Return 0 if detection is successful, -ENODEV otherwise */ 450 static int adm1025_detect(struct i2c_client *client, 451 struct i2c_board_info *info) 452 { 453 struct i2c_adapter *adapter = client->adapter; 454 const char *name; 455 u8 man_id, chip_id; 456 457 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 458 return -ENODEV; 459 460 /* Check for unused bits */ 461 if ((i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG) & 0x80) 462 || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS1) & 0xC0) 463 || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS2) & 0xBC)) { 464 dev_dbg(&adapter->dev, "ADM1025 detection failed at 0x%02x\n", 465 client->addr); 466 return -ENODEV; 467 } 468 469 /* Identification */ 470 chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID); 471 if ((chip_id & 0xF0) != 0x20) 472 return -ENODEV; 473 474 man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID); 475 if (man_id == 0x41) 476 name = "adm1025"; 477 else if (man_id == 0xA1 && client->addr != 0x2E) 478 name = "ne1619"; 479 else 480 return -ENODEV; 481 482 strlcpy(info->type, name, I2C_NAME_SIZE); 483 484 return 0; 485 } 486 487 static void adm1025_init_client(struct i2c_client *client) 488 { 489 u8 reg; 490 struct adm1025_data *data = i2c_get_clientdata(client); 491 int i; 492 493 data->vrm = vid_which_vrm(); 494 495 /* 496 * Set high limits 497 * Usually we avoid setting limits on driver init, but it happens 498 * that the ADM1025 comes with stupid default limits (all registers 499 * set to 0). In case the chip has not gone through any limit 500 * setting yet, we better set the high limits to the max so that 501 * no alarm triggers. 502 */ 503 for (i = 0; i < 6; i++) { 504 reg = i2c_smbus_read_byte_data(client, 505 ADM1025_REG_IN_MAX(i)); 506 if (reg == 0) 507 i2c_smbus_write_byte_data(client, 508 ADM1025_REG_IN_MAX(i), 509 0xFF); 510 } 511 for (i = 0; i < 2; i++) { 512 reg = i2c_smbus_read_byte_data(client, 513 ADM1025_REG_TEMP_HIGH(i)); 514 if (reg == 0) 515 i2c_smbus_write_byte_data(client, 516 ADM1025_REG_TEMP_HIGH(i), 517 0x7F); 518 } 519 520 /* 521 * Start the conversions 522 */ 523 reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG); 524 if (!(reg & 0x01)) 525 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG, 526 (reg&0x7E)|0x01); 527 } 528 529 static int adm1025_probe(struct i2c_client *client, 530 const struct i2c_device_id *id) 531 { 532 struct device *dev = &client->dev; 533 struct device *hwmon_dev; 534 struct adm1025_data *data; 535 u8 config; 536 537 data = devm_kzalloc(dev, sizeof(struct adm1025_data), GFP_KERNEL); 538 if (!data) 539 return -ENOMEM; 540 541 i2c_set_clientdata(client, data); 542 data->client = client; 543 mutex_init(&data->update_lock); 544 545 /* Initialize the ADM1025 chip */ 546 adm1025_init_client(client); 547 548 /* sysfs hooks */ 549 data->groups[0] = &adm1025_group; 550 /* Pin 11 is either in4 (+12V) or VID4 */ 551 config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG); 552 if (!(config & 0x20)) 553 data->groups[1] = &adm1025_group_in4; 554 555 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 556 data, data->groups); 557 return PTR_ERR_OR_ZERO(hwmon_dev); 558 } 559 560 static const struct i2c_device_id adm1025_id[] = { 561 { "adm1025", adm1025 }, 562 { "ne1619", ne1619 }, 563 { } 564 }; 565 MODULE_DEVICE_TABLE(i2c, adm1025_id); 566 567 static struct i2c_driver adm1025_driver = { 568 .class = I2C_CLASS_HWMON, 569 .driver = { 570 .name = "adm1025", 571 }, 572 .probe = adm1025_probe, 573 .id_table = adm1025_id, 574 .detect = adm1025_detect, 575 .address_list = normal_i2c, 576 }; 577 578 module_i2c_driver(adm1025_driver); 579 580 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 581 MODULE_DESCRIPTION("ADM1025 driver"); 582 MODULE_LICENSE("GPL"); 583