1 /* 2 * adm1025.c 3 * 4 * Copyright (C) 2000 Chen-Yuan Wu <gwu@esoft.com> 5 * Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org> 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.analog.com/Analog_Root/productPage/productHome/0,2121,ADM1025,00.html 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-vid.h> 55 #include <linux/err.h> 56 57 /* 58 * Addresses to scan 59 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e. 60 * NE1619 has two possible addresses: 0x2c and 0x2d. 61 */ 62 63 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 64 65 /* 66 * Insmod parameters 67 */ 68 69 I2C_CLIENT_INSMOD_2(adm1025, ne1619); 70 71 /* 72 * The ADM1025 registers 73 */ 74 75 #define ADM1025_REG_MAN_ID 0x3E 76 #define ADM1025_REG_CHIP_ID 0x3F 77 #define ADM1025_REG_CONFIG 0x40 78 #define ADM1025_REG_STATUS1 0x41 79 #define ADM1025_REG_STATUS2 0x42 80 #define ADM1025_REG_IN(nr) (0x20 + (nr)) 81 #define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2) 82 #define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2) 83 #define ADM1025_REG_TEMP(nr) (0x26 + (nr)) 84 #define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2) 85 #define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2) 86 #define ADM1025_REG_VID 0x47 87 #define ADM1025_REG_VID4 0x49 88 89 /* 90 * Conversions and various macros 91 * The ADM1025 uses signed 8-bit values for temperatures. 92 */ 93 94 static int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 }; 95 96 #define IN_FROM_REG(reg,scale) (((reg) * (scale) + 96) / 192) 97 #define IN_TO_REG(val,scale) ((val) <= 0 ? 0 : \ 98 (val) * 192 >= (scale) * 255 ? 255 : \ 99 ((val) * 192 + (scale)/2) / (scale)) 100 101 #define TEMP_FROM_REG(reg) ((reg) * 1000) 102 #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ 103 (val) >= 126500 ? 127 : \ 104 (((val) < 0 ? (val)-500 : (val)+500) / 1000)) 105 106 /* 107 * Functions declaration 108 */ 109 110 static int adm1025_attach_adapter(struct i2c_adapter *adapter); 111 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind); 112 static void adm1025_init_client(struct i2c_client *client); 113 static int adm1025_detach_client(struct i2c_client *client); 114 static struct adm1025_data *adm1025_update_device(struct device *dev); 115 116 /* 117 * Driver data (common to all clients) 118 */ 119 120 static struct i2c_driver adm1025_driver = { 121 .driver = { 122 .name = "adm1025", 123 }, 124 .id = I2C_DRIVERID_ADM1025, 125 .attach_adapter = adm1025_attach_adapter, 126 .detach_client = adm1025_detach_client, 127 }; 128 129 /* 130 * Client data (each client gets its own) 131 */ 132 133 struct adm1025_data { 134 struct i2c_client client; 135 struct class_device *class_dev; 136 struct semaphore update_lock; 137 char valid; /* zero until following fields are valid */ 138 unsigned long last_updated; /* in jiffies */ 139 140 u8 in[6]; /* register value */ 141 u8 in_max[6]; /* register value */ 142 u8 in_min[6]; /* register value */ 143 s8 temp[2]; /* register value */ 144 s8 temp_min[2]; /* register value */ 145 s8 temp_max[2]; /* register value */ 146 u16 alarms; /* register values, combined */ 147 u8 vid; /* register values, combined */ 148 u8 vrm; 149 }; 150 151 /* 152 * Sysfs stuff 153 */ 154 155 #define show_in(offset) \ 156 static ssize_t show_in##offset(struct device *dev, struct device_attribute *attr, char *buf) \ 157 { \ 158 struct adm1025_data *data = adm1025_update_device(dev); \ 159 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \ 160 in_scale[offset])); \ 161 } \ 162 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \ 163 { \ 164 struct adm1025_data *data = adm1025_update_device(dev); \ 165 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \ 166 in_scale[offset])); \ 167 } \ 168 static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \ 169 { \ 170 struct adm1025_data *data = adm1025_update_device(dev); \ 171 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \ 172 in_scale[offset])); \ 173 } \ 174 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); 175 show_in(0); 176 show_in(1); 177 show_in(2); 178 show_in(3); 179 show_in(4); 180 show_in(5); 181 182 #define show_temp(offset) \ 183 static ssize_t show_temp##offset(struct device *dev, struct device_attribute *attr, char *buf) \ 184 { \ 185 struct adm1025_data *data = adm1025_update_device(dev); \ 186 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \ 187 } \ 188 static ssize_t show_temp##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \ 189 { \ 190 struct adm1025_data *data = adm1025_update_device(dev); \ 191 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[offset-1])); \ 192 } \ 193 static ssize_t show_temp##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \ 194 { \ 195 struct adm1025_data *data = adm1025_update_device(dev); \ 196 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[offset-1])); \ 197 }\ 198 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp##offset, NULL); 199 show_temp(1); 200 show_temp(2); 201 202 #define set_in(offset) \ 203 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \ 204 size_t count) \ 205 { \ 206 struct i2c_client *client = to_i2c_client(dev); \ 207 struct adm1025_data *data = i2c_get_clientdata(client); \ 208 long val = simple_strtol(buf, NULL, 10); \ 209 \ 210 down(&data->update_lock); \ 211 data->in_min[offset] = IN_TO_REG(val, in_scale[offset]); \ 212 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(offset), \ 213 data->in_min[offset]); \ 214 up(&data->update_lock); \ 215 return count; \ 216 } \ 217 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \ 218 size_t count) \ 219 { \ 220 struct i2c_client *client = to_i2c_client(dev); \ 221 struct adm1025_data *data = i2c_get_clientdata(client); \ 222 long val = simple_strtol(buf, NULL, 10); \ 223 \ 224 down(&data->update_lock); \ 225 data->in_max[offset] = IN_TO_REG(val, in_scale[offset]); \ 226 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(offset), \ 227 data->in_max[offset]); \ 228 up(&data->update_lock); \ 229 return count; \ 230 } \ 231 static DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \ 232 show_in##offset##_min, set_in##offset##_min); \ 233 static DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \ 234 show_in##offset##_max, set_in##offset##_max); 235 set_in(0); 236 set_in(1); 237 set_in(2); 238 set_in(3); 239 set_in(4); 240 set_in(5); 241 242 #define set_temp(offset) \ 243 static ssize_t set_temp##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \ 244 size_t count) \ 245 { \ 246 struct i2c_client *client = to_i2c_client(dev); \ 247 struct adm1025_data *data = i2c_get_clientdata(client); \ 248 long val = simple_strtol(buf, NULL, 10); \ 249 \ 250 down(&data->update_lock); \ 251 data->temp_min[offset-1] = TEMP_TO_REG(val); \ 252 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(offset-1), \ 253 data->temp_min[offset-1]); \ 254 up(&data->update_lock); \ 255 return count; \ 256 } \ 257 static ssize_t set_temp##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \ 258 size_t count) \ 259 { \ 260 struct i2c_client *client = to_i2c_client(dev); \ 261 struct adm1025_data *data = i2c_get_clientdata(client); \ 262 long val = simple_strtol(buf, NULL, 10); \ 263 \ 264 down(&data->update_lock); \ 265 data->temp_max[offset-1] = TEMP_TO_REG(val); \ 266 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(offset-1), \ 267 data->temp_max[offset-1]); \ 268 up(&data->update_lock); \ 269 return count; \ 270 } \ 271 static DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \ 272 show_temp##offset##_min, set_temp##offset##_min); \ 273 static DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \ 274 show_temp##offset##_max, set_temp##offset##_max); 275 set_temp(1); 276 set_temp(2); 277 278 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) 279 { 280 struct adm1025_data *data = adm1025_update_device(dev); 281 return sprintf(buf, "%u\n", data->alarms); 282 } 283 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 284 285 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) 286 { 287 struct adm1025_data *data = adm1025_update_device(dev); 288 return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm)); 289 } 290 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 291 292 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf) 293 { 294 struct adm1025_data *data = adm1025_update_device(dev); 295 return sprintf(buf, "%u\n", data->vrm); 296 } 297 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 298 { 299 struct i2c_client *client = to_i2c_client(dev); 300 struct adm1025_data *data = i2c_get_clientdata(client); 301 data->vrm = simple_strtoul(buf, NULL, 10); 302 return count; 303 } 304 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm); 305 306 /* 307 * Real code 308 */ 309 310 static int adm1025_attach_adapter(struct i2c_adapter *adapter) 311 { 312 if (!(adapter->class & I2C_CLASS_HWMON)) 313 return 0; 314 return i2c_probe(adapter, &addr_data, adm1025_detect); 315 } 316 317 /* 318 * The following function does more than just detection. If detection 319 * succeeds, it also registers the new chip. 320 */ 321 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind) 322 { 323 struct i2c_client *new_client; 324 struct adm1025_data *data; 325 int err = 0; 326 const char *name = ""; 327 u8 config; 328 329 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 330 goto exit; 331 332 if (!(data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) { 333 err = -ENOMEM; 334 goto exit; 335 } 336 337 /* The common I2C client data is placed right before the 338 ADM1025-specific data. */ 339 new_client = &data->client; 340 i2c_set_clientdata(new_client, data); 341 new_client->addr = address; 342 new_client->adapter = adapter; 343 new_client->driver = &adm1025_driver; 344 new_client->flags = 0; 345 346 /* 347 * Now we do the remaining detection. A negative kind means that 348 * the driver was loaded with no force parameter (default), so we 349 * must both detect and identify the chip. A zero kind means that 350 * the driver was loaded with the force parameter, the detection 351 * step shall be skipped. A positive kind means that the driver 352 * was loaded with the force parameter and a given kind of chip is 353 * requested, so both the detection and the identification steps 354 * are skipped. 355 */ 356 config = i2c_smbus_read_byte_data(new_client, ADM1025_REG_CONFIG); 357 if (kind < 0) { /* detection */ 358 if ((config & 0x80) != 0x00 359 || (i2c_smbus_read_byte_data(new_client, 360 ADM1025_REG_STATUS1) & 0xC0) != 0x00 361 || (i2c_smbus_read_byte_data(new_client, 362 ADM1025_REG_STATUS2) & 0xBC) != 0x00) { 363 dev_dbg(&adapter->dev, 364 "ADM1025 detection failed at 0x%02x.\n", 365 address); 366 goto exit_free; 367 } 368 } 369 370 if (kind <= 0) { /* identification */ 371 u8 man_id, chip_id; 372 373 man_id = i2c_smbus_read_byte_data(new_client, 374 ADM1025_REG_MAN_ID); 375 chip_id = i2c_smbus_read_byte_data(new_client, 376 ADM1025_REG_CHIP_ID); 377 378 if (man_id == 0x41) { /* Analog Devices */ 379 if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */ 380 kind = adm1025; 381 } 382 } else 383 if (man_id == 0xA1) { /* Philips */ 384 if (address != 0x2E 385 && (chip_id & 0xF0) == 0x20) { /* NE1619 */ 386 kind = ne1619; 387 } 388 } 389 390 if (kind <= 0) { /* identification failed */ 391 dev_info(&adapter->dev, 392 "Unsupported chip (man_id=0x%02X, " 393 "chip_id=0x%02X).\n", man_id, chip_id); 394 goto exit_free; 395 } 396 } 397 398 if (kind == adm1025) { 399 name = "adm1025"; 400 } else if (kind == ne1619) { 401 name = "ne1619"; 402 } 403 404 /* We can fill in the remaining client fields */ 405 strlcpy(new_client->name, name, I2C_NAME_SIZE); 406 data->valid = 0; 407 init_MUTEX(&data->update_lock); 408 409 /* Tell the I2C layer a new client has arrived */ 410 if ((err = i2c_attach_client(new_client))) 411 goto exit_free; 412 413 /* Initialize the ADM1025 chip */ 414 adm1025_init_client(new_client); 415 416 /* Register sysfs hooks */ 417 data->class_dev = hwmon_device_register(&new_client->dev); 418 if (IS_ERR(data->class_dev)) { 419 err = PTR_ERR(data->class_dev); 420 goto exit_detach; 421 } 422 423 device_create_file(&new_client->dev, &dev_attr_in0_input); 424 device_create_file(&new_client->dev, &dev_attr_in1_input); 425 device_create_file(&new_client->dev, &dev_attr_in2_input); 426 device_create_file(&new_client->dev, &dev_attr_in3_input); 427 device_create_file(&new_client->dev, &dev_attr_in5_input); 428 device_create_file(&new_client->dev, &dev_attr_in0_min); 429 device_create_file(&new_client->dev, &dev_attr_in1_min); 430 device_create_file(&new_client->dev, &dev_attr_in2_min); 431 device_create_file(&new_client->dev, &dev_attr_in3_min); 432 device_create_file(&new_client->dev, &dev_attr_in5_min); 433 device_create_file(&new_client->dev, &dev_attr_in0_max); 434 device_create_file(&new_client->dev, &dev_attr_in1_max); 435 device_create_file(&new_client->dev, &dev_attr_in2_max); 436 device_create_file(&new_client->dev, &dev_attr_in3_max); 437 device_create_file(&new_client->dev, &dev_attr_in5_max); 438 device_create_file(&new_client->dev, &dev_attr_temp1_input); 439 device_create_file(&new_client->dev, &dev_attr_temp2_input); 440 device_create_file(&new_client->dev, &dev_attr_temp1_min); 441 device_create_file(&new_client->dev, &dev_attr_temp2_min); 442 device_create_file(&new_client->dev, &dev_attr_temp1_max); 443 device_create_file(&new_client->dev, &dev_attr_temp2_max); 444 device_create_file(&new_client->dev, &dev_attr_alarms); 445 device_create_file(&new_client->dev, &dev_attr_cpu0_vid); 446 device_create_file(&new_client->dev, &dev_attr_vrm); 447 448 /* Pin 11 is either in4 (+12V) or VID4 */ 449 if (!(config & 0x20)) { 450 device_create_file(&new_client->dev, &dev_attr_in4_input); 451 device_create_file(&new_client->dev, &dev_attr_in4_min); 452 device_create_file(&new_client->dev, &dev_attr_in4_max); 453 } 454 455 return 0; 456 457 exit_detach: 458 i2c_detach_client(new_client); 459 exit_free: 460 kfree(data); 461 exit: 462 return err; 463 } 464 465 static void adm1025_init_client(struct i2c_client *client) 466 { 467 u8 reg; 468 struct adm1025_data *data = i2c_get_clientdata(client); 469 int i; 470 471 data->vrm = vid_which_vrm(); 472 473 /* 474 * Set high limits 475 * Usually we avoid setting limits on driver init, but it happens 476 * that the ADM1025 comes with stupid default limits (all registers 477 * set to 0). In case the chip has not gone through any limit 478 * setting yet, we better set the high limits to the max so that 479 * no alarm triggers. 480 */ 481 for (i=0; i<6; i++) { 482 reg = i2c_smbus_read_byte_data(client, 483 ADM1025_REG_IN_MAX(i)); 484 if (reg == 0) 485 i2c_smbus_write_byte_data(client, 486 ADM1025_REG_IN_MAX(i), 487 0xFF); 488 } 489 for (i=0; i<2; i++) { 490 reg = i2c_smbus_read_byte_data(client, 491 ADM1025_REG_TEMP_HIGH(i)); 492 if (reg == 0) 493 i2c_smbus_write_byte_data(client, 494 ADM1025_REG_TEMP_HIGH(i), 495 0x7F); 496 } 497 498 /* 499 * Start the conversions 500 */ 501 reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG); 502 if (!(reg & 0x01)) 503 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG, 504 (reg&0x7E)|0x01); 505 } 506 507 static int adm1025_detach_client(struct i2c_client *client) 508 { 509 struct adm1025_data *data = i2c_get_clientdata(client); 510 int err; 511 512 hwmon_device_unregister(data->class_dev); 513 514 if ((err = i2c_detach_client(client))) 515 return err; 516 517 kfree(data); 518 return 0; 519 } 520 521 static struct adm1025_data *adm1025_update_device(struct device *dev) 522 { 523 struct i2c_client *client = to_i2c_client(dev); 524 struct adm1025_data *data = i2c_get_clientdata(client); 525 526 down(&data->update_lock); 527 528 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { 529 int i; 530 531 dev_dbg(&client->dev, "Updating data.\n"); 532 for (i=0; i<6; i++) { 533 data->in[i] = i2c_smbus_read_byte_data(client, 534 ADM1025_REG_IN(i)); 535 data->in_min[i] = i2c_smbus_read_byte_data(client, 536 ADM1025_REG_IN_MIN(i)); 537 data->in_max[i] = i2c_smbus_read_byte_data(client, 538 ADM1025_REG_IN_MAX(i)); 539 } 540 for (i=0; i<2; i++) { 541 data->temp[i] = i2c_smbus_read_byte_data(client, 542 ADM1025_REG_TEMP(i)); 543 data->temp_min[i] = i2c_smbus_read_byte_data(client, 544 ADM1025_REG_TEMP_LOW(i)); 545 data->temp_max[i] = i2c_smbus_read_byte_data(client, 546 ADM1025_REG_TEMP_HIGH(i)); 547 } 548 data->alarms = i2c_smbus_read_byte_data(client, 549 ADM1025_REG_STATUS1) 550 | (i2c_smbus_read_byte_data(client, 551 ADM1025_REG_STATUS2) << 8); 552 data->vid = (i2c_smbus_read_byte_data(client, 553 ADM1025_REG_VID) & 0x0f) 554 | ((i2c_smbus_read_byte_data(client, 555 ADM1025_REG_VID4) & 0x01) << 4); 556 557 data->last_updated = jiffies; 558 data->valid = 1; 559 } 560 561 up(&data->update_lock); 562 563 return data; 564 } 565 566 static int __init sensors_adm1025_init(void) 567 { 568 return i2c_add_driver(&adm1025_driver); 569 } 570 571 static void __exit sensors_adm1025_exit(void) 572 { 573 i2c_del_driver(&adm1025_driver); 574 } 575 576 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); 577 MODULE_DESCRIPTION("ADM1025 driver"); 578 MODULE_LICENSE("GPL"); 579 580 module_init(sensors_adm1025_init); 581 module_exit(sensors_adm1025_exit); 582