1 /* 2 * smsc47m1.c - Part of lm_sensors, Linux kernel modules 3 * for hardware monitoring 4 * 5 * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x, 6 * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997 7 * Super-I/O chips. 8 * 9 * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> 10 * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de> 11 * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com> 12 * and Jean Delvare 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 27 */ 28 29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31 #include <linux/module.h> 32 #include <linux/slab.h> 33 #include <linux/ioport.h> 34 #include <linux/jiffies.h> 35 #include <linux/platform_device.h> 36 #include <linux/hwmon.h> 37 #include <linux/hwmon-sysfs.h> 38 #include <linux/err.h> 39 #include <linux/init.h> 40 #include <linux/mutex.h> 41 #include <linux/sysfs.h> 42 #include <linux/acpi.h> 43 #include <linux/io.h> 44 45 static unsigned short force_id; 46 module_param(force_id, ushort, 0); 47 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 48 49 static struct platform_device *pdev; 50 51 #define DRVNAME "smsc47m1" 52 enum chips { smsc47m1, smsc47m2 }; 53 54 /* Super-I/0 registers and commands */ 55 56 #define REG 0x2e /* The register to read/write */ 57 #define VAL 0x2f /* The value to read/write */ 58 59 static inline void 60 superio_outb(int reg, int val) 61 { 62 outb(reg, REG); 63 outb(val, VAL); 64 } 65 66 static inline int 67 superio_inb(int reg) 68 { 69 outb(reg, REG); 70 return inb(VAL); 71 } 72 73 /* logical device for fans is 0x0A */ 74 #define superio_select() superio_outb(0x07, 0x0A) 75 76 static inline void 77 superio_enter(void) 78 { 79 outb(0x55, REG); 80 } 81 82 static inline void 83 superio_exit(void) 84 { 85 outb(0xAA, REG); 86 } 87 88 #define SUPERIO_REG_ACT 0x30 89 #define SUPERIO_REG_BASE 0x60 90 #define SUPERIO_REG_DEVID 0x20 91 #define SUPERIO_REG_DEVREV 0x21 92 93 /* Logical device registers */ 94 95 #define SMSC_EXTENT 0x80 96 97 /* nr is 0 or 1 in the macros below */ 98 #define SMSC47M1_REG_ALARM 0x04 99 #define SMSC47M1_REG_TPIN(nr) (0x34 - (nr)) 100 #define SMSC47M1_REG_PPIN(nr) (0x36 - (nr)) 101 #define SMSC47M1_REG_FANDIV 0x58 102 103 static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b }; 104 static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c }; 105 static const u8 SMSC47M1_REG_PWM[3] = { 0x56, 0x57, 0x69 }; 106 107 #define SMSC47M2_REG_ALARM6 0x09 108 #define SMSC47M2_REG_TPIN1 0x38 109 #define SMSC47M2_REG_TPIN2 0x37 110 #define SMSC47M2_REG_TPIN3 0x2d 111 #define SMSC47M2_REG_PPIN3 0x2c 112 #define SMSC47M2_REG_FANDIV3 0x6a 113 114 #define MIN_FROM_REG(reg, div) ((reg) >= 192 ? 0 : \ 115 983040 / ((192 - (reg)) * (div))) 116 #define FAN_FROM_REG(reg, div, preload) ((reg) <= (preload) || (reg) == 255 ? \ 117 0 : \ 118 983040 / (((reg) - (preload)) * (div))) 119 #define DIV_FROM_REG(reg) (1 << (reg)) 120 #define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1) 121 #define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01) 122 #define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E) 123 124 struct smsc47m1_data { 125 unsigned short addr; 126 const char *name; 127 enum chips type; 128 struct device *hwmon_dev; 129 130 struct mutex update_lock; 131 unsigned long last_updated; /* In jiffies */ 132 133 u8 fan[3]; /* Register value */ 134 u8 fan_preload[3]; /* Register value */ 135 u8 fan_div[3]; /* Register encoding, shifted right */ 136 u8 alarms; /* Register encoding */ 137 u8 pwm[3]; /* Register value (bit 0 is disable) */ 138 }; 139 140 struct smsc47m1_sio_data { 141 enum chips type; 142 u8 activate; /* Remember initial device state */ 143 }; 144 145 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg) 146 { 147 return inb_p(data->addr + reg); 148 } 149 150 static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg, 151 u8 value) 152 { 153 outb_p(value, data->addr + reg); 154 } 155 156 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev, 157 int init) 158 { 159 struct smsc47m1_data *data = dev_get_drvdata(dev); 160 161 mutex_lock(&data->update_lock); 162 163 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) { 164 int i, fan_nr; 165 fan_nr = data->type == smsc47m2 ? 3 : 2; 166 167 for (i = 0; i < fan_nr; i++) { 168 data->fan[i] = smsc47m1_read_value(data, 169 SMSC47M1_REG_FAN[i]); 170 data->fan_preload[i] = smsc47m1_read_value(data, 171 SMSC47M1_REG_FAN_PRELOAD[i]); 172 data->pwm[i] = smsc47m1_read_value(data, 173 SMSC47M1_REG_PWM[i]); 174 } 175 176 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV); 177 data->fan_div[0] = (i >> 4) & 0x03; 178 data->fan_div[1] = i >> 6; 179 180 data->alarms = smsc47m1_read_value(data, 181 SMSC47M1_REG_ALARM) >> 6; 182 /* Clear alarms if needed */ 183 if (data->alarms) 184 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0); 185 186 if (fan_nr >= 3) { 187 data->fan_div[2] = (smsc47m1_read_value(data, 188 SMSC47M2_REG_FANDIV3) >> 4) & 0x03; 189 data->alarms |= (smsc47m1_read_value(data, 190 SMSC47M2_REG_ALARM6) & 0x40) >> 4; 191 /* Clear alarm if needed */ 192 if (data->alarms & 0x04) 193 smsc47m1_write_value(data, 194 SMSC47M2_REG_ALARM6, 195 0x40); 196 } 197 198 data->last_updated = jiffies; 199 } 200 201 mutex_unlock(&data->update_lock); 202 return data; 203 } 204 205 static ssize_t get_fan(struct device *dev, struct device_attribute 206 *devattr, char *buf) 207 { 208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 209 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 210 int nr = attr->index; 211 /* 212 * This chip (stupidly) stops monitoring fan speed if PWM is 213 * enabled and duty cycle is 0%. This is fine if the monitoring 214 * and control concern the same fan, but troublesome if they are 215 * not (which could as well happen). 216 */ 217 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 : 218 FAN_FROM_REG(data->fan[nr], 219 DIV_FROM_REG(data->fan_div[nr]), 220 data->fan_preload[nr]); 221 return sprintf(buf, "%d\n", rpm); 222 } 223 224 static ssize_t get_fan_min(struct device *dev, struct device_attribute 225 *devattr, char *buf) 226 { 227 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 228 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 229 int nr = attr->index; 230 int rpm = MIN_FROM_REG(data->fan_preload[nr], 231 DIV_FROM_REG(data->fan_div[nr])); 232 return sprintf(buf, "%d\n", rpm); 233 } 234 235 static ssize_t get_fan_div(struct device *dev, struct device_attribute 236 *devattr, char *buf) 237 { 238 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 239 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 240 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); 241 } 242 243 static ssize_t get_fan_alarm(struct device *dev, struct device_attribute 244 *devattr, char *buf) 245 { 246 int bitnr = to_sensor_dev_attr(devattr)->index; 247 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 248 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 249 } 250 251 static ssize_t get_pwm(struct device *dev, struct device_attribute 252 *devattr, char *buf) 253 { 254 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 255 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 256 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index])); 257 } 258 259 static ssize_t get_pwm_en(struct device *dev, struct device_attribute 260 *devattr, char *buf) 261 { 262 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 263 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 264 return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index])); 265 } 266 267 static ssize_t get_alarms(struct device *dev, struct device_attribute 268 *devattr, char *buf) 269 { 270 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 271 return sprintf(buf, "%d\n", data->alarms); 272 } 273 274 static ssize_t set_fan_min(struct device *dev, struct device_attribute 275 *devattr, const char *buf, size_t count) 276 { 277 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 278 struct smsc47m1_data *data = dev_get_drvdata(dev); 279 int nr = attr->index; 280 long rpmdiv; 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 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]); 290 291 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) { 292 mutex_unlock(&data->update_lock); 293 return -EINVAL; 294 } 295 296 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv); 297 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 298 data->fan_preload[nr]); 299 mutex_unlock(&data->update_lock); 300 301 return count; 302 } 303 304 /* 305 * Note: we save and restore the fan minimum here, because its value is 306 * determined in part by the fan clock divider. This follows the principle 307 * of least surprise; the user doesn't expect the fan minimum to change just 308 * because the divider changed. 309 */ 310 static ssize_t set_fan_div(struct device *dev, struct device_attribute 311 *devattr, const char *buf, size_t count) 312 { 313 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 314 struct smsc47m1_data *data = dev_get_drvdata(dev); 315 int nr = attr->index; 316 long new_div; 317 int err; 318 long tmp; 319 u8 old_div = DIV_FROM_REG(data->fan_div[nr]); 320 321 err = kstrtol(buf, 10, &new_div); 322 if (err) 323 return err; 324 325 if (new_div == old_div) /* No change */ 326 return count; 327 328 mutex_lock(&data->update_lock); 329 switch (new_div) { 330 case 1: 331 data->fan_div[nr] = 0; 332 break; 333 case 2: 334 data->fan_div[nr] = 1; 335 break; 336 case 4: 337 data->fan_div[nr] = 2; 338 break; 339 case 8: 340 data->fan_div[nr] = 3; 341 break; 342 default: 343 mutex_unlock(&data->update_lock); 344 return -EINVAL; 345 } 346 347 switch (nr) { 348 case 0: 349 case 1: 350 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV) 351 & ~(0x03 << (4 + 2 * nr)); 352 tmp |= data->fan_div[nr] << (4 + 2 * nr); 353 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp); 354 break; 355 case 2: 356 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF; 357 tmp |= data->fan_div[2] << 4; 358 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp); 359 break; 360 } 361 362 /* Preserve fan min */ 363 tmp = 192 - (old_div * (192 - data->fan_preload[nr]) 364 + new_div / 2) / new_div; 365 data->fan_preload[nr] = clamp_val(tmp, 0, 191); 366 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 367 data->fan_preload[nr]); 368 mutex_unlock(&data->update_lock); 369 370 return count; 371 } 372 373 static ssize_t set_pwm(struct device *dev, struct device_attribute 374 *devattr, const char *buf, size_t count) 375 { 376 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 377 struct smsc47m1_data *data = dev_get_drvdata(dev); 378 int nr = attr->index; 379 long val; 380 int err; 381 382 err = kstrtol(buf, 10, &val); 383 if (err) 384 return err; 385 386 if (val < 0 || val > 255) 387 return -EINVAL; 388 389 mutex_lock(&data->update_lock); 390 data->pwm[nr] &= 0x81; /* Preserve additional bits */ 391 data->pwm[nr] |= PWM_TO_REG(val); 392 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 393 data->pwm[nr]); 394 mutex_unlock(&data->update_lock); 395 396 return count; 397 } 398 399 static ssize_t set_pwm_en(struct device *dev, struct device_attribute 400 *devattr, const char *buf, size_t count) 401 { 402 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 403 struct smsc47m1_data *data = dev_get_drvdata(dev); 404 int nr = attr->index; 405 unsigned long val; 406 int err; 407 408 err = kstrtoul(buf, 10, &val); 409 if (err) 410 return err; 411 412 if (val > 1) 413 return -EINVAL; 414 415 mutex_lock(&data->update_lock); 416 data->pwm[nr] &= 0xFE; /* preserve the other bits */ 417 data->pwm[nr] |= !val; 418 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 419 data->pwm[nr]); 420 mutex_unlock(&data->update_lock); 421 422 return count; 423 } 424 425 #define fan_present(offset) \ 426 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan, \ 427 NULL, offset - 1); \ 428 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 429 get_fan_min, set_fan_min, offset - 1); \ 430 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 431 get_fan_div, set_fan_div, offset - 1); \ 432 static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm, \ 433 NULL, offset - 1); \ 434 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \ 435 get_pwm, set_pwm, offset - 1); \ 436 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \ 437 get_pwm_en, set_pwm_en, offset - 1) 438 439 fan_present(1); 440 fan_present(2); 441 fan_present(3); 442 443 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL); 444 445 static ssize_t show_name(struct device *dev, struct device_attribute 446 *devattr, char *buf) 447 { 448 struct smsc47m1_data *data = dev_get_drvdata(dev); 449 450 return sprintf(buf, "%s\n", data->name); 451 } 452 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 453 454 static struct attribute *smsc47m1_attributes_fan1[] = { 455 &sensor_dev_attr_fan1_input.dev_attr.attr, 456 &sensor_dev_attr_fan1_min.dev_attr.attr, 457 &sensor_dev_attr_fan1_div.dev_attr.attr, 458 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 459 NULL 460 }; 461 462 static const struct attribute_group smsc47m1_group_fan1 = { 463 .attrs = smsc47m1_attributes_fan1, 464 }; 465 466 static struct attribute *smsc47m1_attributes_fan2[] = { 467 &sensor_dev_attr_fan2_input.dev_attr.attr, 468 &sensor_dev_attr_fan2_min.dev_attr.attr, 469 &sensor_dev_attr_fan2_div.dev_attr.attr, 470 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 471 NULL 472 }; 473 474 static const struct attribute_group smsc47m1_group_fan2 = { 475 .attrs = smsc47m1_attributes_fan2, 476 }; 477 478 static struct attribute *smsc47m1_attributes_fan3[] = { 479 &sensor_dev_attr_fan3_input.dev_attr.attr, 480 &sensor_dev_attr_fan3_min.dev_attr.attr, 481 &sensor_dev_attr_fan3_div.dev_attr.attr, 482 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 483 NULL 484 }; 485 486 static const struct attribute_group smsc47m1_group_fan3 = { 487 .attrs = smsc47m1_attributes_fan3, 488 }; 489 490 static struct attribute *smsc47m1_attributes_pwm1[] = { 491 &sensor_dev_attr_pwm1.dev_attr.attr, 492 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 493 NULL 494 }; 495 496 static const struct attribute_group smsc47m1_group_pwm1 = { 497 .attrs = smsc47m1_attributes_pwm1, 498 }; 499 500 static struct attribute *smsc47m1_attributes_pwm2[] = { 501 &sensor_dev_attr_pwm2.dev_attr.attr, 502 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 503 NULL 504 }; 505 506 static const struct attribute_group smsc47m1_group_pwm2 = { 507 .attrs = smsc47m1_attributes_pwm2, 508 }; 509 510 static struct attribute *smsc47m1_attributes_pwm3[] = { 511 &sensor_dev_attr_pwm3.dev_attr.attr, 512 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 513 NULL 514 }; 515 516 static const struct attribute_group smsc47m1_group_pwm3 = { 517 .attrs = smsc47m1_attributes_pwm3, 518 }; 519 520 static struct attribute *smsc47m1_attributes[] = { 521 &dev_attr_alarms.attr, 522 &dev_attr_name.attr, 523 NULL 524 }; 525 526 static const struct attribute_group smsc47m1_group = { 527 .attrs = smsc47m1_attributes, 528 }; 529 530 static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data) 531 { 532 u8 val; 533 unsigned short addr; 534 535 superio_enter(); 536 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); 537 538 /* 539 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x 540 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control. 541 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block" 542 * can do much more besides (device id 0x60). 543 * The LPC47M997 is undocumented, but seems to be compatible with 544 * the LPC47M192, and has the same device id. 545 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it 546 * supports a 3rd fan, and the pin configuration registers are 547 * unfortunately different. 548 * The LPC47M233 has the same device id (0x6B) but is not compatible. 549 * We check the high bit of the device revision register to 550 * differentiate them. 551 */ 552 switch (val) { 553 case 0x51: 554 pr_info("Found SMSC LPC47B27x\n"); 555 sio_data->type = smsc47m1; 556 break; 557 case 0x59: 558 pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n"); 559 sio_data->type = smsc47m1; 560 break; 561 case 0x5F: 562 pr_info("Found SMSC LPC47M14x\n"); 563 sio_data->type = smsc47m1; 564 break; 565 case 0x60: 566 pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n"); 567 sio_data->type = smsc47m1; 568 break; 569 case 0x6B: 570 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) { 571 pr_debug("Found SMSC LPC47M233, unsupported\n"); 572 superio_exit(); 573 return -ENODEV; 574 } 575 576 pr_info("Found SMSC LPC47M292\n"); 577 sio_data->type = smsc47m2; 578 break; 579 default: 580 superio_exit(); 581 return -ENODEV; 582 } 583 584 superio_select(); 585 addr = (superio_inb(SUPERIO_REG_BASE) << 8) 586 | superio_inb(SUPERIO_REG_BASE + 1); 587 if (addr == 0) { 588 pr_info("Device address not set, will not use\n"); 589 superio_exit(); 590 return -ENODEV; 591 } 592 593 /* 594 * Enable only if address is set (needed at least on the 595 * Compaq Presario S4000NX) 596 */ 597 sio_data->activate = superio_inb(SUPERIO_REG_ACT); 598 if ((sio_data->activate & 0x01) == 0) { 599 pr_info("Enabling device\n"); 600 superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01); 601 } 602 603 superio_exit(); 604 return addr; 605 } 606 607 /* Restore device to its initial state */ 608 static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data) 609 { 610 if ((sio_data->activate & 0x01) == 0) { 611 superio_enter(); 612 superio_select(); 613 614 pr_info("Disabling device\n"); 615 superio_outb(SUPERIO_REG_ACT, sio_data->activate); 616 617 superio_exit(); 618 } 619 } 620 621 #define CHECK 1 622 #define REQUEST 2 623 624 /* 625 * This function can be used to: 626 * - test for resource conflicts with ACPI 627 * - request the resources 628 * We only allocate the I/O ports we really need, to minimize the risk of 629 * conflicts with ACPI or with other drivers. 630 */ 631 static int __init smsc47m1_handle_resources(unsigned short address, 632 enum chips type, int action, 633 struct device *dev) 634 { 635 static const u8 ports_m1[] = { 636 /* register, region length */ 637 0x04, 1, 638 0x33, 4, 639 0x56, 7, 640 }; 641 642 static const u8 ports_m2[] = { 643 /* register, region length */ 644 0x04, 1, 645 0x09, 1, 646 0x2c, 2, 647 0x35, 4, 648 0x56, 7, 649 0x69, 4, 650 }; 651 652 int i, ports_size, err; 653 const u8 *ports; 654 655 switch (type) { 656 case smsc47m1: 657 default: 658 ports = ports_m1; 659 ports_size = ARRAY_SIZE(ports_m1); 660 break; 661 case smsc47m2: 662 ports = ports_m2; 663 ports_size = ARRAY_SIZE(ports_m2); 664 break; 665 } 666 667 for (i = 0; i + 1 < ports_size; i += 2) { 668 unsigned short start = address + ports[i]; 669 unsigned short len = ports[i + 1]; 670 671 switch (action) { 672 case CHECK: 673 /* Only check for conflicts */ 674 err = acpi_check_region(start, len, DRVNAME); 675 if (err) 676 return err; 677 break; 678 case REQUEST: 679 /* Request the resources */ 680 if (!devm_request_region(dev, start, len, DRVNAME)) { 681 dev_err(dev, 682 "Region 0x%hx-0x%hx already in use!\n", 683 start, start + len); 684 return -EBUSY; 685 } 686 break; 687 } 688 } 689 690 return 0; 691 } 692 693 static void smsc47m1_remove_files(struct device *dev) 694 { 695 sysfs_remove_group(&dev->kobj, &smsc47m1_group); 696 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1); 697 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2); 698 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3); 699 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1); 700 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2); 701 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3); 702 } 703 704 static int __init smsc47m1_probe(struct platform_device *pdev) 705 { 706 struct device *dev = &pdev->dev; 707 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev); 708 struct smsc47m1_data *data; 709 struct resource *res; 710 int err; 711 int fan1, fan2, fan3, pwm1, pwm2, pwm3; 712 713 static const char * const names[] = { 714 "smsc47m1", 715 "smsc47m2", 716 }; 717 718 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 719 err = smsc47m1_handle_resources(res->start, sio_data->type, 720 REQUEST, dev); 721 if (err < 0) 722 return err; 723 724 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL); 725 if (!data) 726 return -ENOMEM; 727 728 data->addr = res->start; 729 data->type = sio_data->type; 730 data->name = names[sio_data->type]; 731 mutex_init(&data->update_lock); 732 platform_set_drvdata(pdev, data); 733 734 /* 735 * If no function is properly configured, there's no point in 736 * actually registering the chip. 737 */ 738 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05) 739 == 0x04; 740 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05) 741 == 0x04; 742 if (data->type == smsc47m2) { 743 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1) 744 & 0x0d) == 0x09; 745 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2) 746 & 0x0d) == 0x09; 747 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3) 748 & 0x0d) == 0x0d; 749 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3) 750 & 0x0d) == 0x08; 751 } else { 752 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0)) 753 & 0x05) == 0x05; 754 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1)) 755 & 0x05) == 0x05; 756 fan3 = 0; 757 pwm3 = 0; 758 } 759 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) { 760 dev_warn(dev, "Device not configured, will not use\n"); 761 return -ENODEV; 762 } 763 764 /* 765 * Some values (fan min, clock dividers, pwm registers) may be 766 * needed before any update is triggered, so we better read them 767 * at least once here. We don't usually do it that way, but in 768 * this particular case, manually reading 5 registers out of 8 769 * doesn't make much sense and we're better using the existing 770 * function. 771 */ 772 smsc47m1_update_device(dev, 1); 773 774 /* Register sysfs hooks */ 775 if (fan1) { 776 err = sysfs_create_group(&dev->kobj, 777 &smsc47m1_group_fan1); 778 if (err) 779 goto error_remove_files; 780 } else 781 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n"); 782 783 if (fan2) { 784 err = sysfs_create_group(&dev->kobj, 785 &smsc47m1_group_fan2); 786 if (err) 787 goto error_remove_files; 788 } else 789 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n"); 790 791 if (fan3) { 792 err = sysfs_create_group(&dev->kobj, 793 &smsc47m1_group_fan3); 794 if (err) 795 goto error_remove_files; 796 } else if (data->type == smsc47m2) 797 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n"); 798 799 if (pwm1) { 800 err = sysfs_create_group(&dev->kobj, 801 &smsc47m1_group_pwm1); 802 if (err) 803 goto error_remove_files; 804 } else 805 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n"); 806 807 if (pwm2) { 808 err = sysfs_create_group(&dev->kobj, 809 &smsc47m1_group_pwm2); 810 if (err) 811 goto error_remove_files; 812 } else 813 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n"); 814 815 if (pwm3) { 816 err = sysfs_create_group(&dev->kobj, 817 &smsc47m1_group_pwm3); 818 if (err) 819 goto error_remove_files; 820 } else if (data->type == smsc47m2) 821 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n"); 822 823 err = sysfs_create_group(&dev->kobj, &smsc47m1_group); 824 if (err) 825 goto error_remove_files; 826 827 data->hwmon_dev = hwmon_device_register(dev); 828 if (IS_ERR(data->hwmon_dev)) { 829 err = PTR_ERR(data->hwmon_dev); 830 goto error_remove_files; 831 } 832 833 return 0; 834 835 error_remove_files: 836 smsc47m1_remove_files(dev); 837 return err; 838 } 839 840 static int __exit smsc47m1_remove(struct platform_device *pdev) 841 { 842 struct smsc47m1_data *data = platform_get_drvdata(pdev); 843 844 hwmon_device_unregister(data->hwmon_dev); 845 smsc47m1_remove_files(&pdev->dev); 846 847 return 0; 848 } 849 850 static struct platform_driver smsc47m1_driver = { 851 .driver = { 852 .name = DRVNAME, 853 }, 854 .remove = __exit_p(smsc47m1_remove), 855 }; 856 857 static int __init smsc47m1_device_add(unsigned short address, 858 const struct smsc47m1_sio_data *sio_data) 859 { 860 struct resource res = { 861 .start = address, 862 .end = address + SMSC_EXTENT - 1, 863 .name = DRVNAME, 864 .flags = IORESOURCE_IO, 865 }; 866 int err; 867 868 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL); 869 if (err) 870 goto exit; 871 872 pdev = platform_device_alloc(DRVNAME, address); 873 if (!pdev) { 874 err = -ENOMEM; 875 pr_err("Device allocation failed\n"); 876 goto exit; 877 } 878 879 err = platform_device_add_resources(pdev, &res, 1); 880 if (err) { 881 pr_err("Device resource addition failed (%d)\n", err); 882 goto exit_device_put; 883 } 884 885 err = platform_device_add_data(pdev, sio_data, 886 sizeof(struct smsc47m1_sio_data)); 887 if (err) { 888 pr_err("Platform data allocation failed\n"); 889 goto exit_device_put; 890 } 891 892 err = platform_device_add(pdev); 893 if (err) { 894 pr_err("Device addition failed (%d)\n", err); 895 goto exit_device_put; 896 } 897 898 return 0; 899 900 exit_device_put: 901 platform_device_put(pdev); 902 exit: 903 return err; 904 } 905 906 static int __init sm_smsc47m1_init(void) 907 { 908 int err; 909 unsigned short address; 910 struct smsc47m1_sio_data sio_data; 911 912 err = smsc47m1_find(&sio_data); 913 if (err < 0) 914 return err; 915 address = err; 916 917 /* Sets global pdev as a side effect */ 918 err = smsc47m1_device_add(address, &sio_data); 919 if (err) 920 return err; 921 922 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe); 923 if (err) 924 goto exit_device; 925 926 return 0; 927 928 exit_device: 929 platform_device_unregister(pdev); 930 smsc47m1_restore(&sio_data); 931 return err; 932 } 933 934 static void __exit sm_smsc47m1_exit(void) 935 { 936 platform_driver_unregister(&smsc47m1_driver); 937 smsc47m1_restore(dev_get_platdata(&pdev->dev)); 938 platform_device_unregister(pdev); 939 } 940 941 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>"); 942 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver"); 943 MODULE_LICENSE("GPL"); 944 945 module_init(sm_smsc47m1_init); 946 module_exit(sm_smsc47m1_exit); 947