1 /* 2 * lm78.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> 5 * Copyright (c) 2007, 2011 Jean Delvare <khali@linux-fr.org> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/jiffies.h> 28 #include <linux/i2c.h> 29 #include <linux/hwmon.h> 30 #include <linux/hwmon-vid.h> 31 #include <linux/hwmon-sysfs.h> 32 #include <linux/err.h> 33 #include <linux/mutex.h> 34 35 #ifdef CONFIG_ISA 36 #include <linux/platform_device.h> 37 #include <linux/ioport.h> 38 #include <linux/io.h> 39 #endif 40 41 /* Addresses to scan */ 42 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 43 0x2e, 0x2f, I2C_CLIENT_END }; 44 enum chips { lm78, lm79 }; 45 46 /* Many LM78 constants specified below */ 47 48 /* Length of ISA address segment */ 49 #define LM78_EXTENT 8 50 51 /* Where are the ISA address/data registers relative to the base address */ 52 #define LM78_ADDR_REG_OFFSET 5 53 #define LM78_DATA_REG_OFFSET 6 54 55 /* The LM78 registers */ 56 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2) 57 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2) 58 #define LM78_REG_IN(nr) (0x20 + (nr)) 59 60 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr)) 61 #define LM78_REG_FAN(nr) (0x28 + (nr)) 62 63 #define LM78_REG_TEMP 0x27 64 #define LM78_REG_TEMP_OVER 0x39 65 #define LM78_REG_TEMP_HYST 0x3a 66 67 #define LM78_REG_ALARM1 0x41 68 #define LM78_REG_ALARM2 0x42 69 70 #define LM78_REG_VID_FANDIV 0x47 71 72 #define LM78_REG_CONFIG 0x40 73 #define LM78_REG_CHIPID 0x49 74 #define LM78_REG_I2C_ADDR 0x48 75 76 77 /* 78 * Conversions. Rounding and limit checking is only done on the TO_REG 79 * variants. 80 */ 81 82 /* 83 * IN: mV (0V to 4.08V) 84 * REG: 16mV/bit 85 */ 86 static inline u8 IN_TO_REG(unsigned long val) 87 { 88 unsigned long nval = SENSORS_LIMIT(val, 0, 4080); 89 return (nval + 8) / 16; 90 } 91 #define IN_FROM_REG(val) ((val) * 16) 92 93 static inline u8 FAN_TO_REG(long rpm, int div) 94 { 95 if (rpm <= 0) 96 return 255; 97 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); 98 } 99 100 static inline int FAN_FROM_REG(u8 val, int div) 101 { 102 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div); 103 } 104 105 /* 106 * TEMP: mC (-128C to +127C) 107 * REG: 1C/bit, two's complement 108 */ 109 static inline s8 TEMP_TO_REG(int val) 110 { 111 int nval = SENSORS_LIMIT(val, -128000, 127000) ; 112 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000; 113 } 114 115 static inline int TEMP_FROM_REG(s8 val) 116 { 117 return val * 1000; 118 } 119 120 #define DIV_FROM_REG(val) (1 << (val)) 121 122 struct lm78_data { 123 struct i2c_client *client; 124 struct device *hwmon_dev; 125 struct mutex lock; 126 enum chips type; 127 128 /* For ISA device only */ 129 const char *name; 130 int isa_addr; 131 132 struct mutex update_lock; 133 char valid; /* !=0 if following fields are valid */ 134 unsigned long last_updated; /* In jiffies */ 135 136 u8 in[7]; /* Register value */ 137 u8 in_max[7]; /* Register value */ 138 u8 in_min[7]; /* Register value */ 139 u8 fan[3]; /* Register value */ 140 u8 fan_min[3]; /* Register value */ 141 s8 temp; /* Register value */ 142 s8 temp_over; /* Register value */ 143 s8 temp_hyst; /* Register value */ 144 u8 fan_div[3]; /* Register encoding, shifted right */ 145 u8 vid; /* Register encoding, combined */ 146 u16 alarms; /* Register encoding, combined */ 147 }; 148 149 150 static int lm78_read_value(struct lm78_data *data, u8 reg); 151 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value); 152 static struct lm78_data *lm78_update_device(struct device *dev); 153 static void lm78_init_device(struct lm78_data *data); 154 155 156 /* 7 Voltages */ 157 static ssize_t show_in(struct device *dev, struct device_attribute *da, 158 char *buf) 159 { 160 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 161 struct lm78_data *data = lm78_update_device(dev); 162 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index])); 163 } 164 165 static ssize_t show_in_min(struct device *dev, struct device_attribute *da, 166 char *buf) 167 { 168 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 169 struct lm78_data *data = lm78_update_device(dev); 170 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index])); 171 } 172 173 static ssize_t show_in_max(struct device *dev, struct device_attribute *da, 174 char *buf) 175 { 176 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 177 struct lm78_data *data = lm78_update_device(dev); 178 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index])); 179 } 180 181 static ssize_t set_in_min(struct device *dev, struct device_attribute *da, 182 const char *buf, size_t count) 183 { 184 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 185 struct lm78_data *data = dev_get_drvdata(dev); 186 int nr = attr->index; 187 unsigned long val; 188 int err; 189 190 err = kstrtoul(buf, 10, &val); 191 if (err) 192 return err; 193 194 mutex_lock(&data->update_lock); 195 data->in_min[nr] = IN_TO_REG(val); 196 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]); 197 mutex_unlock(&data->update_lock); 198 return count; 199 } 200 201 static ssize_t set_in_max(struct device *dev, struct device_attribute *da, 202 const char *buf, size_t count) 203 { 204 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 205 struct lm78_data *data = dev_get_drvdata(dev); 206 int nr = attr->index; 207 unsigned long val; 208 int err; 209 210 err = kstrtoul(buf, 10, &val); 211 if (err) 212 return err; 213 214 mutex_lock(&data->update_lock); 215 data->in_max[nr] = IN_TO_REG(val); 216 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]); 217 mutex_unlock(&data->update_lock); 218 return count; 219 } 220 221 #define show_in_offset(offset) \ 222 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 223 show_in, NULL, offset); \ 224 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 225 show_in_min, set_in_min, offset); \ 226 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 227 show_in_max, set_in_max, offset); 228 229 show_in_offset(0); 230 show_in_offset(1); 231 show_in_offset(2); 232 show_in_offset(3); 233 show_in_offset(4); 234 show_in_offset(5); 235 show_in_offset(6); 236 237 /* Temperature */ 238 static ssize_t show_temp(struct device *dev, struct device_attribute *da, 239 char *buf) 240 { 241 struct lm78_data *data = lm78_update_device(dev); 242 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); 243 } 244 245 static ssize_t show_temp_over(struct device *dev, struct device_attribute *da, 246 char *buf) 247 { 248 struct lm78_data *data = lm78_update_device(dev); 249 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over)); 250 } 251 252 static ssize_t set_temp_over(struct device *dev, struct device_attribute *da, 253 const char *buf, size_t count) 254 { 255 struct lm78_data *data = dev_get_drvdata(dev); 256 long val; 257 int err; 258 259 err = kstrtol(buf, 10, &val); 260 if (err) 261 return err; 262 263 mutex_lock(&data->update_lock); 264 data->temp_over = TEMP_TO_REG(val); 265 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over); 266 mutex_unlock(&data->update_lock); 267 return count; 268 } 269 270 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da, 271 char *buf) 272 { 273 struct lm78_data *data = lm78_update_device(dev); 274 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); 275 } 276 277 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da, 278 const char *buf, size_t count) 279 { 280 struct lm78_data *data = dev_get_drvdata(dev); 281 long val; 282 int err; 283 284 err = kstrtol(buf, 10, &val); 285 if (err) 286 return err; 287 288 mutex_lock(&data->update_lock); 289 data->temp_hyst = TEMP_TO_REG(val); 290 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst); 291 mutex_unlock(&data->update_lock); 292 return count; 293 } 294 295 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 296 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, 297 show_temp_over, set_temp_over); 298 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, 299 show_temp_hyst, set_temp_hyst); 300 301 /* 3 Fans */ 302 static ssize_t show_fan(struct device *dev, struct device_attribute *da, 303 char *buf) 304 { 305 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 306 struct lm78_data *data = lm78_update_device(dev); 307 int nr = attr->index; 308 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], 309 DIV_FROM_REG(data->fan_div[nr]))); 310 } 311 312 static ssize_t show_fan_min(struct device *dev, struct device_attribute *da, 313 char *buf) 314 { 315 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 316 struct lm78_data *data = lm78_update_device(dev); 317 int nr = attr->index; 318 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr], 319 DIV_FROM_REG(data->fan_div[nr]))); 320 } 321 322 static ssize_t set_fan_min(struct device *dev, struct device_attribute *da, 323 const char *buf, size_t count) 324 { 325 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 326 struct lm78_data *data = dev_get_drvdata(dev); 327 int nr = attr->index; 328 unsigned long val; 329 int err; 330 331 err = kstrtoul(buf, 10, &val); 332 if (err) 333 return err; 334 335 mutex_lock(&data->update_lock); 336 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); 337 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); 338 mutex_unlock(&data->update_lock); 339 return count; 340 } 341 342 static ssize_t show_fan_div(struct device *dev, struct device_attribute *da, 343 char *buf) 344 { 345 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 346 struct lm78_data *data = lm78_update_device(dev); 347 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); 348 } 349 350 /* 351 * Note: we save and restore the fan minimum here, because its value is 352 * determined in part by the fan divisor. This follows the principle of 353 * least surprise; the user doesn't expect the fan minimum to change just 354 * because the divisor changed. 355 */ 356 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da, 357 const char *buf, size_t count) 358 { 359 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 360 struct lm78_data *data = dev_get_drvdata(dev); 361 int nr = attr->index; 362 unsigned long min; 363 u8 reg; 364 unsigned long val; 365 int err; 366 367 err = kstrtoul(buf, 10, &val); 368 if (err) 369 return err; 370 371 mutex_lock(&data->update_lock); 372 min = FAN_FROM_REG(data->fan_min[nr], 373 DIV_FROM_REG(data->fan_div[nr])); 374 375 switch (val) { 376 case 1: 377 data->fan_div[nr] = 0; 378 break; 379 case 2: 380 data->fan_div[nr] = 1; 381 break; 382 case 4: 383 data->fan_div[nr] = 2; 384 break; 385 case 8: 386 data->fan_div[nr] = 3; 387 break; 388 default: 389 dev_err(dev, "fan_div value %ld not " 390 "supported. Choose one of 1, 2, 4 or 8!\n", val); 391 mutex_unlock(&data->update_lock); 392 return -EINVAL; 393 } 394 395 reg = lm78_read_value(data, LM78_REG_VID_FANDIV); 396 switch (nr) { 397 case 0: 398 reg = (reg & 0xcf) | (data->fan_div[nr] << 4); 399 break; 400 case 1: 401 reg = (reg & 0x3f) | (data->fan_div[nr] << 6); 402 break; 403 } 404 lm78_write_value(data, LM78_REG_VID_FANDIV, reg); 405 406 data->fan_min[nr] = 407 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); 408 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); 409 mutex_unlock(&data->update_lock); 410 411 return count; 412 } 413 414 #define show_fan_offset(offset) \ 415 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ 416 show_fan, NULL, offset - 1); \ 417 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 418 show_fan_min, set_fan_min, offset - 1); 419 420 show_fan_offset(1); 421 show_fan_offset(2); 422 show_fan_offset(3); 423 424 /* Fan 3 divisor is locked in H/W */ 425 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, 426 show_fan_div, set_fan_div, 0); 427 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, 428 show_fan_div, set_fan_div, 1); 429 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2); 430 431 /* VID */ 432 static ssize_t show_vid(struct device *dev, struct device_attribute *da, 433 char *buf) 434 { 435 struct lm78_data *data = lm78_update_device(dev); 436 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82)); 437 } 438 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 439 440 /* Alarms */ 441 static ssize_t show_alarms(struct device *dev, struct device_attribute *da, 442 char *buf) 443 { 444 struct lm78_data *data = lm78_update_device(dev); 445 return sprintf(buf, "%u\n", data->alarms); 446 } 447 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 448 449 static ssize_t show_alarm(struct device *dev, struct device_attribute *da, 450 char *buf) 451 { 452 struct lm78_data *data = lm78_update_device(dev); 453 int nr = to_sensor_dev_attr(da)->index; 454 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1); 455 } 456 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 457 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 458 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 459 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 460 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 461 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 462 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10); 463 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 464 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 465 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11); 466 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 467 468 static struct attribute *lm78_attributes[] = { 469 &sensor_dev_attr_in0_input.dev_attr.attr, 470 &sensor_dev_attr_in0_min.dev_attr.attr, 471 &sensor_dev_attr_in0_max.dev_attr.attr, 472 &sensor_dev_attr_in0_alarm.dev_attr.attr, 473 &sensor_dev_attr_in1_input.dev_attr.attr, 474 &sensor_dev_attr_in1_min.dev_attr.attr, 475 &sensor_dev_attr_in1_max.dev_attr.attr, 476 &sensor_dev_attr_in1_alarm.dev_attr.attr, 477 &sensor_dev_attr_in2_input.dev_attr.attr, 478 &sensor_dev_attr_in2_min.dev_attr.attr, 479 &sensor_dev_attr_in2_max.dev_attr.attr, 480 &sensor_dev_attr_in2_alarm.dev_attr.attr, 481 &sensor_dev_attr_in3_input.dev_attr.attr, 482 &sensor_dev_attr_in3_min.dev_attr.attr, 483 &sensor_dev_attr_in3_max.dev_attr.attr, 484 &sensor_dev_attr_in3_alarm.dev_attr.attr, 485 &sensor_dev_attr_in4_input.dev_attr.attr, 486 &sensor_dev_attr_in4_min.dev_attr.attr, 487 &sensor_dev_attr_in4_max.dev_attr.attr, 488 &sensor_dev_attr_in4_alarm.dev_attr.attr, 489 &sensor_dev_attr_in5_input.dev_attr.attr, 490 &sensor_dev_attr_in5_min.dev_attr.attr, 491 &sensor_dev_attr_in5_max.dev_attr.attr, 492 &sensor_dev_attr_in5_alarm.dev_attr.attr, 493 &sensor_dev_attr_in6_input.dev_attr.attr, 494 &sensor_dev_attr_in6_min.dev_attr.attr, 495 &sensor_dev_attr_in6_max.dev_attr.attr, 496 &sensor_dev_attr_in6_alarm.dev_attr.attr, 497 &dev_attr_temp1_input.attr, 498 &dev_attr_temp1_max.attr, 499 &dev_attr_temp1_max_hyst.attr, 500 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 501 &sensor_dev_attr_fan1_input.dev_attr.attr, 502 &sensor_dev_attr_fan1_min.dev_attr.attr, 503 &sensor_dev_attr_fan1_div.dev_attr.attr, 504 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 505 &sensor_dev_attr_fan2_input.dev_attr.attr, 506 &sensor_dev_attr_fan2_min.dev_attr.attr, 507 &sensor_dev_attr_fan2_div.dev_attr.attr, 508 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 509 &sensor_dev_attr_fan3_input.dev_attr.attr, 510 &sensor_dev_attr_fan3_min.dev_attr.attr, 511 &sensor_dev_attr_fan3_div.dev_attr.attr, 512 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 513 &dev_attr_alarms.attr, 514 &dev_attr_cpu0_vid.attr, 515 516 NULL 517 }; 518 519 static const struct attribute_group lm78_group = { 520 .attrs = lm78_attributes, 521 }; 522 523 /* 524 * ISA related code 525 */ 526 #ifdef CONFIG_ISA 527 528 /* ISA device, if found */ 529 static struct platform_device *pdev; 530 531 static unsigned short isa_address = 0x290; 532 533 /* 534 * I2C devices get this name attribute automatically, but for ISA devices 535 * we must create it by ourselves. 536 */ 537 static ssize_t show_name(struct device *dev, struct device_attribute 538 *devattr, char *buf) 539 { 540 struct lm78_data *data = dev_get_drvdata(dev); 541 542 return sprintf(buf, "%s\n", data->name); 543 } 544 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 545 546 static struct lm78_data *lm78_data_if_isa(void) 547 { 548 return pdev ? platform_get_drvdata(pdev) : NULL; 549 } 550 551 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */ 552 static int lm78_alias_detect(struct i2c_client *client, u8 chipid) 553 { 554 struct lm78_data *isa; 555 int i; 556 557 if (!pdev) /* No ISA chip */ 558 return 0; 559 isa = platform_get_drvdata(pdev); 560 561 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr) 562 return 0; /* Address doesn't match */ 563 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe)) 564 return 0; /* Chip type doesn't match */ 565 566 /* 567 * We compare all the limit registers, the config register and the 568 * interrupt mask registers 569 */ 570 for (i = 0x2b; i <= 0x3d; i++) { 571 if (lm78_read_value(isa, i) != 572 i2c_smbus_read_byte_data(client, i)) 573 return 0; 574 } 575 if (lm78_read_value(isa, LM78_REG_CONFIG) != 576 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG)) 577 return 0; 578 for (i = 0x43; i <= 0x46; i++) { 579 if (lm78_read_value(isa, i) != 580 i2c_smbus_read_byte_data(client, i)) 581 return 0; 582 } 583 584 return 1; 585 } 586 #else /* !CONFIG_ISA */ 587 588 static int lm78_alias_detect(struct i2c_client *client, u8 chipid) 589 { 590 return 0; 591 } 592 593 static struct lm78_data *lm78_data_if_isa(void) 594 { 595 return NULL; 596 } 597 #endif /* CONFIG_ISA */ 598 599 static int lm78_i2c_detect(struct i2c_client *client, 600 struct i2c_board_info *info) 601 { 602 int i; 603 struct lm78_data *isa = lm78_data_if_isa(); 604 const char *client_name; 605 struct i2c_adapter *adapter = client->adapter; 606 int address = client->addr; 607 608 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 609 return -ENODEV; 610 611 /* 612 * We block updates of the ISA device to minimize the risk of 613 * concurrent access to the same LM78 chip through different 614 * interfaces. 615 */ 616 if (isa) 617 mutex_lock(&isa->update_lock); 618 619 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80) 620 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address) 621 goto err_nodev; 622 623 /* Explicitly prevent the misdetection of Winbond chips */ 624 i = i2c_smbus_read_byte_data(client, 0x4f); 625 if (i == 0xa3 || i == 0x5c) 626 goto err_nodev; 627 628 /* Determine the chip type. */ 629 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID); 630 if (i == 0x00 || i == 0x20 /* LM78 */ 631 || i == 0x40) /* LM78-J */ 632 client_name = "lm78"; 633 else if ((i & 0xfe) == 0xc0) 634 client_name = "lm79"; 635 else 636 goto err_nodev; 637 638 if (lm78_alias_detect(client, i)) { 639 dev_dbg(&adapter->dev, "Device at 0x%02x appears to " 640 "be the same as ISA device\n", address); 641 goto err_nodev; 642 } 643 644 if (isa) 645 mutex_unlock(&isa->update_lock); 646 647 strlcpy(info->type, client_name, I2C_NAME_SIZE); 648 649 return 0; 650 651 err_nodev: 652 if (isa) 653 mutex_unlock(&isa->update_lock); 654 return -ENODEV; 655 } 656 657 static int lm78_i2c_probe(struct i2c_client *client, 658 const struct i2c_device_id *id) 659 { 660 struct lm78_data *data; 661 int err; 662 663 data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL); 664 if (!data) 665 return -ENOMEM; 666 667 i2c_set_clientdata(client, data); 668 data->client = client; 669 data->type = id->driver_data; 670 671 /* Initialize the LM78 chip */ 672 lm78_init_device(data); 673 674 /* Register sysfs hooks */ 675 err = sysfs_create_group(&client->dev.kobj, &lm78_group); 676 if (err) 677 return err; 678 679 data->hwmon_dev = hwmon_device_register(&client->dev); 680 if (IS_ERR(data->hwmon_dev)) { 681 err = PTR_ERR(data->hwmon_dev); 682 goto error; 683 } 684 685 return 0; 686 687 error: 688 sysfs_remove_group(&client->dev.kobj, &lm78_group); 689 return err; 690 } 691 692 static int lm78_i2c_remove(struct i2c_client *client) 693 { 694 struct lm78_data *data = i2c_get_clientdata(client); 695 696 hwmon_device_unregister(data->hwmon_dev); 697 sysfs_remove_group(&client->dev.kobj, &lm78_group); 698 699 return 0; 700 } 701 702 static const struct i2c_device_id lm78_i2c_id[] = { 703 { "lm78", lm78 }, 704 { "lm79", lm79 }, 705 { } 706 }; 707 MODULE_DEVICE_TABLE(i2c, lm78_i2c_id); 708 709 static struct i2c_driver lm78_driver = { 710 .class = I2C_CLASS_HWMON, 711 .driver = { 712 .name = "lm78", 713 }, 714 .probe = lm78_i2c_probe, 715 .remove = lm78_i2c_remove, 716 .id_table = lm78_i2c_id, 717 .detect = lm78_i2c_detect, 718 .address_list = normal_i2c, 719 }; 720 721 /* 722 * The SMBus locks itself, but ISA access must be locked explicitly! 723 * We don't want to lock the whole ISA bus, so we lock each client 724 * separately. 725 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, 726 * would slow down the LM78 access and should not be necessary. 727 */ 728 static int lm78_read_value(struct lm78_data *data, u8 reg) 729 { 730 struct i2c_client *client = data->client; 731 732 #ifdef CONFIG_ISA 733 if (!client) { /* ISA device */ 734 int res; 735 mutex_lock(&data->lock); 736 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); 737 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET); 738 mutex_unlock(&data->lock); 739 return res; 740 } else 741 #endif 742 return i2c_smbus_read_byte_data(client, reg); 743 } 744 745 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value) 746 { 747 struct i2c_client *client = data->client; 748 749 #ifdef CONFIG_ISA 750 if (!client) { /* ISA device */ 751 mutex_lock(&data->lock); 752 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); 753 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET); 754 mutex_unlock(&data->lock); 755 return 0; 756 } else 757 #endif 758 return i2c_smbus_write_byte_data(client, reg, value); 759 } 760 761 static void lm78_init_device(struct lm78_data *data) 762 { 763 u8 config; 764 int i; 765 766 /* Start monitoring */ 767 config = lm78_read_value(data, LM78_REG_CONFIG); 768 if ((config & 0x09) != 0x01) 769 lm78_write_value(data, LM78_REG_CONFIG, 770 (config & 0xf7) | 0x01); 771 772 /* A few vars need to be filled upon startup */ 773 for (i = 0; i < 3; i++) { 774 data->fan_min[i] = lm78_read_value(data, 775 LM78_REG_FAN_MIN(i)); 776 } 777 778 mutex_init(&data->update_lock); 779 } 780 781 static struct lm78_data *lm78_update_device(struct device *dev) 782 { 783 struct lm78_data *data = dev_get_drvdata(dev); 784 int i; 785 786 mutex_lock(&data->update_lock); 787 788 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 789 || !data->valid) { 790 791 dev_dbg(dev, "Starting lm78 update\n"); 792 793 for (i = 0; i <= 6; i++) { 794 data->in[i] = 795 lm78_read_value(data, LM78_REG_IN(i)); 796 data->in_min[i] = 797 lm78_read_value(data, LM78_REG_IN_MIN(i)); 798 data->in_max[i] = 799 lm78_read_value(data, LM78_REG_IN_MAX(i)); 800 } 801 for (i = 0; i < 3; i++) { 802 data->fan[i] = 803 lm78_read_value(data, LM78_REG_FAN(i)); 804 data->fan_min[i] = 805 lm78_read_value(data, LM78_REG_FAN_MIN(i)); 806 } 807 data->temp = lm78_read_value(data, LM78_REG_TEMP); 808 data->temp_over = 809 lm78_read_value(data, LM78_REG_TEMP_OVER); 810 data->temp_hyst = 811 lm78_read_value(data, LM78_REG_TEMP_HYST); 812 i = lm78_read_value(data, LM78_REG_VID_FANDIV); 813 data->vid = i & 0x0f; 814 if (data->type == lm79) 815 data->vid |= 816 (lm78_read_value(data, LM78_REG_CHIPID) & 817 0x01) << 4; 818 else 819 data->vid |= 0x10; 820 data->fan_div[0] = (i >> 4) & 0x03; 821 data->fan_div[1] = i >> 6; 822 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) + 823 (lm78_read_value(data, LM78_REG_ALARM2) << 8); 824 data->last_updated = jiffies; 825 data->valid = 1; 826 827 data->fan_div[2] = 1; 828 } 829 830 mutex_unlock(&data->update_lock); 831 832 return data; 833 } 834 835 #ifdef CONFIG_ISA 836 static int lm78_isa_probe(struct platform_device *pdev) 837 { 838 int err; 839 struct lm78_data *data; 840 struct resource *res; 841 842 /* Reserve the ISA region */ 843 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 844 if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET, 845 2, "lm78")) 846 return -EBUSY; 847 848 data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL); 849 if (!data) 850 return -ENOMEM; 851 852 mutex_init(&data->lock); 853 data->isa_addr = res->start; 854 platform_set_drvdata(pdev, data); 855 856 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { 857 data->type = lm79; 858 data->name = "lm79"; 859 } else { 860 data->type = lm78; 861 data->name = "lm78"; 862 } 863 864 /* Initialize the LM78 chip */ 865 lm78_init_device(data); 866 867 /* Register sysfs hooks */ 868 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group); 869 if (err) 870 goto exit_remove_files; 871 err = device_create_file(&pdev->dev, &dev_attr_name); 872 if (err) 873 goto exit_remove_files; 874 875 data->hwmon_dev = hwmon_device_register(&pdev->dev); 876 if (IS_ERR(data->hwmon_dev)) { 877 err = PTR_ERR(data->hwmon_dev); 878 goto exit_remove_files; 879 } 880 881 return 0; 882 883 exit_remove_files: 884 sysfs_remove_group(&pdev->dev.kobj, &lm78_group); 885 device_remove_file(&pdev->dev, &dev_attr_name); 886 return err; 887 } 888 889 static int lm78_isa_remove(struct platform_device *pdev) 890 { 891 struct lm78_data *data = platform_get_drvdata(pdev); 892 893 hwmon_device_unregister(data->hwmon_dev); 894 sysfs_remove_group(&pdev->dev.kobj, &lm78_group); 895 device_remove_file(&pdev->dev, &dev_attr_name); 896 897 return 0; 898 } 899 900 static struct platform_driver lm78_isa_driver = { 901 .driver = { 902 .owner = THIS_MODULE, 903 .name = "lm78", 904 }, 905 .probe = lm78_isa_probe, 906 .remove = lm78_isa_remove, 907 }; 908 909 /* return 1 if a supported chip is found, 0 otherwise */ 910 static int __init lm78_isa_found(unsigned short address) 911 { 912 int val, save, found = 0; 913 int port; 914 915 /* 916 * Some boards declare base+0 to base+7 as a PNP device, some base+4 917 * to base+7 and some base+5 to base+6. So we better request each port 918 * individually for the probing phase. 919 */ 920 for (port = address; port < address + LM78_EXTENT; port++) { 921 if (!request_region(port, 1, "lm78")) { 922 pr_debug("Failed to request port 0x%x\n", port); 923 goto release; 924 } 925 } 926 927 #define REALLY_SLOW_IO 928 /* 929 * We need the timeouts for at least some LM78-like 930 * chips. But only if we read 'undefined' registers. 931 */ 932 val = inb_p(address + 1); 933 if (inb_p(address + 2) != val 934 || inb_p(address + 3) != val 935 || inb_p(address + 7) != val) 936 goto release; 937 #undef REALLY_SLOW_IO 938 939 /* 940 * We should be able to change the 7 LSB of the address port. The 941 * MSB (busy flag) should be clear initially, set after the write. 942 */ 943 save = inb_p(address + LM78_ADDR_REG_OFFSET); 944 if (save & 0x80) 945 goto release; 946 val = ~save & 0x7f; 947 outb_p(val, address + LM78_ADDR_REG_OFFSET); 948 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) { 949 outb_p(save, address + LM78_ADDR_REG_OFFSET); 950 goto release; 951 } 952 953 /* We found a device, now see if it could be an LM78 */ 954 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET); 955 val = inb_p(address + LM78_DATA_REG_OFFSET); 956 if (val & 0x80) 957 goto release; 958 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET); 959 val = inb_p(address + LM78_DATA_REG_OFFSET); 960 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */ 961 goto release; 962 963 /* The busy flag should be clear again */ 964 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80) 965 goto release; 966 967 /* Explicitly prevent the misdetection of Winbond chips */ 968 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET); 969 val = inb_p(address + LM78_DATA_REG_OFFSET); 970 if (val == 0xa3 || val == 0x5c) 971 goto release; 972 973 /* Explicitly prevent the misdetection of ITE chips */ 974 outb_p(0x58, address + LM78_ADDR_REG_OFFSET); 975 val = inb_p(address + LM78_DATA_REG_OFFSET); 976 if (val == 0x90) 977 goto release; 978 979 /* Determine the chip type */ 980 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET); 981 val = inb_p(address + LM78_DATA_REG_OFFSET); 982 if (val == 0x00 || val == 0x20 /* LM78 */ 983 || val == 0x40 /* LM78-J */ 984 || (val & 0xfe) == 0xc0) /* LM79 */ 985 found = 1; 986 987 if (found) 988 pr_info("Found an %s chip at %#x\n", 989 val & 0x80 ? "LM79" : "LM78", (int)address); 990 991 release: 992 for (port--; port >= address; port--) 993 release_region(port, 1); 994 return found; 995 } 996 997 static int __init lm78_isa_device_add(unsigned short address) 998 { 999 struct resource res = { 1000 .start = address, 1001 .end = address + LM78_EXTENT - 1, 1002 .name = "lm78", 1003 .flags = IORESOURCE_IO, 1004 }; 1005 int err; 1006 1007 pdev = platform_device_alloc("lm78", address); 1008 if (!pdev) { 1009 err = -ENOMEM; 1010 pr_err("Device allocation failed\n"); 1011 goto exit; 1012 } 1013 1014 err = platform_device_add_resources(pdev, &res, 1); 1015 if (err) { 1016 pr_err("Device resource addition failed (%d)\n", err); 1017 goto exit_device_put; 1018 } 1019 1020 err = platform_device_add(pdev); 1021 if (err) { 1022 pr_err("Device addition failed (%d)\n", err); 1023 goto exit_device_put; 1024 } 1025 1026 return 0; 1027 1028 exit_device_put: 1029 platform_device_put(pdev); 1030 exit: 1031 pdev = NULL; 1032 return err; 1033 } 1034 1035 static int __init lm78_isa_register(void) 1036 { 1037 int res; 1038 1039 if (lm78_isa_found(isa_address)) { 1040 res = platform_driver_register(&lm78_isa_driver); 1041 if (res) 1042 goto exit; 1043 1044 /* Sets global pdev as a side effect */ 1045 res = lm78_isa_device_add(isa_address); 1046 if (res) 1047 goto exit_unreg_isa_driver; 1048 } 1049 1050 return 0; 1051 1052 exit_unreg_isa_driver: 1053 platform_driver_unregister(&lm78_isa_driver); 1054 exit: 1055 return res; 1056 } 1057 1058 static void lm78_isa_unregister(void) 1059 { 1060 if (pdev) { 1061 platform_device_unregister(pdev); 1062 platform_driver_unregister(&lm78_isa_driver); 1063 } 1064 } 1065 #else /* !CONFIG_ISA */ 1066 1067 static int __init lm78_isa_register(void) 1068 { 1069 return 0; 1070 } 1071 1072 static void lm78_isa_unregister(void) 1073 { 1074 } 1075 #endif /* CONFIG_ISA */ 1076 1077 static int __init sm_lm78_init(void) 1078 { 1079 int res; 1080 1081 /* 1082 * We register the ISA device first, so that we can skip the 1083 * registration of an I2C interface to the same device. 1084 */ 1085 res = lm78_isa_register(); 1086 if (res) 1087 goto exit; 1088 1089 res = i2c_add_driver(&lm78_driver); 1090 if (res) 1091 goto exit_unreg_isa_device; 1092 1093 return 0; 1094 1095 exit_unreg_isa_device: 1096 lm78_isa_unregister(); 1097 exit: 1098 return res; 1099 } 1100 1101 static void __exit sm_lm78_exit(void) 1102 { 1103 lm78_isa_unregister(); 1104 i2c_del_driver(&lm78_driver); 1105 } 1106 1107 MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>"); 1108 MODULE_DESCRIPTION("LM78/LM79 driver"); 1109 MODULE_LICENSE("GPL"); 1110 1111 module_init(sm_lm78_init); 1112 module_exit(sm_lm78_exit); 1113