1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * smsc47m1.c - Part of lm_sensors, Linux kernel modules 4 * for hardware monitoring 5 * 6 * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x, 7 * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997 8 * Super-I/O chips. 9 * 10 * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> 11 * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de> 12 * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com> 13 * and Jean Delvare 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/ioport.h> 21 #include <linux/jiffies.h> 22 #include <linux/platform_device.h> 23 #include <linux/hwmon.h> 24 #include <linux/hwmon-sysfs.h> 25 #include <linux/err.h> 26 #include <linux/init.h> 27 #include <linux/mutex.h> 28 #include <linux/sysfs.h> 29 #include <linux/acpi.h> 30 #include <linux/io.h> 31 32 static unsigned short force_id; 33 module_param(force_id, ushort, 0); 34 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 35 36 static struct platform_device *pdev; 37 38 #define DRVNAME "smsc47m1" 39 enum chips { smsc47m1, smsc47m2 }; 40 41 /* Super-I/0 registers and commands */ 42 43 #define REG 0x2e /* The register to read/write */ 44 #define VAL 0x2f /* The value to read/write */ 45 46 static inline void 47 superio_outb(int reg, int val) 48 { 49 outb(reg, REG); 50 outb(val, VAL); 51 } 52 53 static inline int 54 superio_inb(int reg) 55 { 56 outb(reg, REG); 57 return inb(VAL); 58 } 59 60 /* logical device for fans is 0x0A */ 61 #define superio_select() superio_outb(0x07, 0x0A) 62 63 static inline int 64 superio_enter(void) 65 { 66 if (!request_muxed_region(REG, 2, DRVNAME)) 67 return -EBUSY; 68 69 outb(0x55, REG); 70 return 0; 71 } 72 73 static inline void 74 superio_exit(void) 75 { 76 outb(0xAA, REG); 77 release_region(REG, 2); 78 } 79 80 #define SUPERIO_REG_ACT 0x30 81 #define SUPERIO_REG_BASE 0x60 82 #define SUPERIO_REG_DEVID 0x20 83 #define SUPERIO_REG_DEVREV 0x21 84 85 /* Logical device registers */ 86 87 #define SMSC_EXTENT 0x80 88 89 /* nr is 0 or 1 in the macros below */ 90 #define SMSC47M1_REG_ALARM 0x04 91 #define SMSC47M1_REG_TPIN(nr) (0x34 - (nr)) 92 #define SMSC47M1_REG_PPIN(nr) (0x36 - (nr)) 93 #define SMSC47M1_REG_FANDIV 0x58 94 95 static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b }; 96 static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c }; 97 static const u8 SMSC47M1_REG_PWM[3] = { 0x56, 0x57, 0x69 }; 98 99 #define SMSC47M2_REG_ALARM6 0x09 100 #define SMSC47M2_REG_TPIN1 0x38 101 #define SMSC47M2_REG_TPIN2 0x37 102 #define SMSC47M2_REG_TPIN3 0x2d 103 #define SMSC47M2_REG_PPIN3 0x2c 104 #define SMSC47M2_REG_FANDIV3 0x6a 105 106 #define MIN_FROM_REG(reg, div) ((reg) >= 192 ? 0 : \ 107 983040 / ((192 - (reg)) * (div))) 108 #define FAN_FROM_REG(reg, div, preload) ((reg) <= (preload) || (reg) == 255 ? \ 109 0 : \ 110 983040 / (((reg) - (preload)) * (div))) 111 #define DIV_FROM_REG(reg) (1 << (reg)) 112 #define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1) 113 #define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01) 114 #define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E) 115 116 struct smsc47m1_data { 117 unsigned short addr; 118 const char *name; 119 enum chips type; 120 struct device *hwmon_dev; 121 122 struct mutex update_lock; 123 unsigned long last_updated; /* In jiffies */ 124 125 u8 fan[3]; /* Register value */ 126 u8 fan_preload[3]; /* Register value */ 127 u8 fan_div[3]; /* Register encoding, shifted right */ 128 u8 alarms; /* Register encoding */ 129 u8 pwm[3]; /* Register value (bit 0 is disable) */ 130 }; 131 132 struct smsc47m1_sio_data { 133 enum chips type; 134 u8 activate; /* Remember initial device state */ 135 }; 136 137 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg) 138 { 139 return inb_p(data->addr + reg); 140 } 141 142 static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg, 143 u8 value) 144 { 145 outb_p(value, data->addr + reg); 146 } 147 148 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev, 149 int init) 150 { 151 struct smsc47m1_data *data = dev_get_drvdata(dev); 152 153 mutex_lock(&data->update_lock); 154 155 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) { 156 int i, fan_nr; 157 fan_nr = data->type == smsc47m2 ? 3 : 2; 158 159 for (i = 0; i < fan_nr; i++) { 160 data->fan[i] = smsc47m1_read_value(data, 161 SMSC47M1_REG_FAN[i]); 162 data->fan_preload[i] = smsc47m1_read_value(data, 163 SMSC47M1_REG_FAN_PRELOAD[i]); 164 data->pwm[i] = smsc47m1_read_value(data, 165 SMSC47M1_REG_PWM[i]); 166 } 167 168 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV); 169 data->fan_div[0] = (i >> 4) & 0x03; 170 data->fan_div[1] = i >> 6; 171 172 data->alarms = smsc47m1_read_value(data, 173 SMSC47M1_REG_ALARM) >> 6; 174 /* Clear alarms if needed */ 175 if (data->alarms) 176 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0); 177 178 if (fan_nr >= 3) { 179 data->fan_div[2] = (smsc47m1_read_value(data, 180 SMSC47M2_REG_FANDIV3) >> 4) & 0x03; 181 data->alarms |= (smsc47m1_read_value(data, 182 SMSC47M2_REG_ALARM6) & 0x40) >> 4; 183 /* Clear alarm if needed */ 184 if (data->alarms & 0x04) 185 smsc47m1_write_value(data, 186 SMSC47M2_REG_ALARM6, 187 0x40); 188 } 189 190 data->last_updated = jiffies; 191 } 192 193 mutex_unlock(&data->update_lock); 194 return data; 195 } 196 197 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, 198 char *buf) 199 { 200 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 201 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 202 int nr = attr->index; 203 /* 204 * This chip (stupidly) stops monitoring fan speed if PWM is 205 * enabled and duty cycle is 0%. This is fine if the monitoring 206 * and control concern the same fan, but troublesome if they are 207 * not (which could as well happen). 208 */ 209 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 : 210 FAN_FROM_REG(data->fan[nr], 211 DIV_FROM_REG(data->fan_div[nr]), 212 data->fan_preload[nr]); 213 return sprintf(buf, "%d\n", rpm); 214 } 215 216 static ssize_t fan_min_show(struct device *dev, 217 struct device_attribute *devattr, char *buf) 218 { 219 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 220 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 221 int nr = attr->index; 222 int rpm = MIN_FROM_REG(data->fan_preload[nr], 223 DIV_FROM_REG(data->fan_div[nr])); 224 return sprintf(buf, "%d\n", rpm); 225 } 226 227 static ssize_t fan_div_show(struct device *dev, 228 struct device_attribute *devattr, char *buf) 229 { 230 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 231 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 232 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); 233 } 234 235 static ssize_t fan_alarm_show(struct device *dev, 236 struct device_attribute *devattr, char *buf) 237 { 238 int bitnr = to_sensor_dev_attr(devattr)->index; 239 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 240 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 241 } 242 243 static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr, 244 char *buf) 245 { 246 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 247 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 248 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index])); 249 } 250 251 static ssize_t pwm_en_show(struct device *dev, 252 struct device_attribute *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_EN_FROM_REG(data->pwm[attr->index])); 257 } 258 259 static ssize_t alarms_show(struct device *dev, 260 struct device_attribute *devattr, char *buf) 261 { 262 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 263 return sprintf(buf, "%d\n", data->alarms); 264 } 265 266 static ssize_t fan_min_store(struct device *dev, 267 struct device_attribute *devattr, 268 const char *buf, size_t count) 269 { 270 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 271 struct smsc47m1_data *data = dev_get_drvdata(dev); 272 int nr = attr->index; 273 long rpmdiv; 274 long val; 275 int err; 276 277 err = kstrtol(buf, 10, &val); 278 if (err) 279 return err; 280 281 mutex_lock(&data->update_lock); 282 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]); 283 284 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) { 285 mutex_unlock(&data->update_lock); 286 return -EINVAL; 287 } 288 289 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv); 290 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 291 data->fan_preload[nr]); 292 mutex_unlock(&data->update_lock); 293 294 return count; 295 } 296 297 /* 298 * Note: we save and restore the fan minimum here, because its value is 299 * determined in part by the fan clock divider. This follows the principle 300 * of least surprise; the user doesn't expect the fan minimum to change just 301 * because the divider changed. 302 */ 303 static ssize_t fan_div_store(struct device *dev, 304 struct device_attribute *devattr, 305 const char *buf, size_t count) 306 { 307 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 308 struct smsc47m1_data *data = dev_get_drvdata(dev); 309 int nr = attr->index; 310 long new_div; 311 int err; 312 long tmp; 313 u8 old_div = DIV_FROM_REG(data->fan_div[nr]); 314 315 err = kstrtol(buf, 10, &new_div); 316 if (err) 317 return err; 318 319 if (new_div == old_div) /* No change */ 320 return count; 321 322 mutex_lock(&data->update_lock); 323 switch (new_div) { 324 case 1: 325 data->fan_div[nr] = 0; 326 break; 327 case 2: 328 data->fan_div[nr] = 1; 329 break; 330 case 4: 331 data->fan_div[nr] = 2; 332 break; 333 case 8: 334 data->fan_div[nr] = 3; 335 break; 336 default: 337 mutex_unlock(&data->update_lock); 338 return -EINVAL; 339 } 340 341 switch (nr) { 342 case 0: 343 case 1: 344 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV) 345 & ~(0x03 << (4 + 2 * nr)); 346 tmp |= data->fan_div[nr] << (4 + 2 * nr); 347 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp); 348 break; 349 case 2: 350 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF; 351 tmp |= data->fan_div[2] << 4; 352 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp); 353 break; 354 default: 355 BUG(); 356 } 357 358 /* Preserve fan min */ 359 tmp = 192 - (old_div * (192 - data->fan_preload[nr]) 360 + new_div / 2) / new_div; 361 data->fan_preload[nr] = clamp_val(tmp, 0, 191); 362 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 363 data->fan_preload[nr]); 364 mutex_unlock(&data->update_lock); 365 366 return count; 367 } 368 369 static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr, 370 const char *buf, size_t count) 371 { 372 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 373 struct smsc47m1_data *data = dev_get_drvdata(dev); 374 int nr = attr->index; 375 long val; 376 int err; 377 378 err = kstrtol(buf, 10, &val); 379 if (err) 380 return err; 381 382 if (val < 0 || val > 255) 383 return -EINVAL; 384 385 mutex_lock(&data->update_lock); 386 data->pwm[nr] &= 0x81; /* Preserve additional bits */ 387 data->pwm[nr] |= PWM_TO_REG(val); 388 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 389 data->pwm[nr]); 390 mutex_unlock(&data->update_lock); 391 392 return count; 393 } 394 395 static ssize_t pwm_en_store(struct device *dev, 396 struct device_attribute *devattr, const char *buf, 397 size_t count) 398 { 399 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 400 struct smsc47m1_data *data = dev_get_drvdata(dev); 401 int nr = attr->index; 402 unsigned long val; 403 int err; 404 405 err = kstrtoul(buf, 10, &val); 406 if (err) 407 return err; 408 409 if (val > 1) 410 return -EINVAL; 411 412 mutex_lock(&data->update_lock); 413 data->pwm[nr] &= 0xFE; /* preserve the other bits */ 414 data->pwm[nr] |= !val; 415 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 416 data->pwm[nr]); 417 mutex_unlock(&data->update_lock); 418 419 return count; 420 } 421 422 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); 423 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); 424 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); 425 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0); 426 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); 427 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_en, 0); 428 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); 429 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); 430 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); 431 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1); 432 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); 433 static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_en, 1); 434 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); 435 static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2); 436 static SENSOR_DEVICE_ATTR_RW(fan3_div, fan_div, 2); 437 static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2); 438 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2); 439 static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_en, 2); 440 441 static DEVICE_ATTR_RO(alarms); 442 443 static ssize_t name_show(struct device *dev, struct device_attribute 444 *devattr, char *buf) 445 { 446 struct smsc47m1_data *data = dev_get_drvdata(dev); 447 448 return sprintf(buf, "%s\n", data->name); 449 } 450 static DEVICE_ATTR_RO(name); 451 452 static struct attribute *smsc47m1_attributes_fan1[] = { 453 &sensor_dev_attr_fan1_input.dev_attr.attr, 454 &sensor_dev_attr_fan1_min.dev_attr.attr, 455 &sensor_dev_attr_fan1_div.dev_attr.attr, 456 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 457 NULL 458 }; 459 460 static const struct attribute_group smsc47m1_group_fan1 = { 461 .attrs = smsc47m1_attributes_fan1, 462 }; 463 464 static struct attribute *smsc47m1_attributes_fan2[] = { 465 &sensor_dev_attr_fan2_input.dev_attr.attr, 466 &sensor_dev_attr_fan2_min.dev_attr.attr, 467 &sensor_dev_attr_fan2_div.dev_attr.attr, 468 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 469 NULL 470 }; 471 472 static const struct attribute_group smsc47m1_group_fan2 = { 473 .attrs = smsc47m1_attributes_fan2, 474 }; 475 476 static struct attribute *smsc47m1_attributes_fan3[] = { 477 &sensor_dev_attr_fan3_input.dev_attr.attr, 478 &sensor_dev_attr_fan3_min.dev_attr.attr, 479 &sensor_dev_attr_fan3_div.dev_attr.attr, 480 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 481 NULL 482 }; 483 484 static const struct attribute_group smsc47m1_group_fan3 = { 485 .attrs = smsc47m1_attributes_fan3, 486 }; 487 488 static struct attribute *smsc47m1_attributes_pwm1[] = { 489 &sensor_dev_attr_pwm1.dev_attr.attr, 490 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 491 NULL 492 }; 493 494 static const struct attribute_group smsc47m1_group_pwm1 = { 495 .attrs = smsc47m1_attributes_pwm1, 496 }; 497 498 static struct attribute *smsc47m1_attributes_pwm2[] = { 499 &sensor_dev_attr_pwm2.dev_attr.attr, 500 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 501 NULL 502 }; 503 504 static const struct attribute_group smsc47m1_group_pwm2 = { 505 .attrs = smsc47m1_attributes_pwm2, 506 }; 507 508 static struct attribute *smsc47m1_attributes_pwm3[] = { 509 &sensor_dev_attr_pwm3.dev_attr.attr, 510 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 511 NULL 512 }; 513 514 static const struct attribute_group smsc47m1_group_pwm3 = { 515 .attrs = smsc47m1_attributes_pwm3, 516 }; 517 518 static struct attribute *smsc47m1_attributes[] = { 519 &dev_attr_alarms.attr, 520 &dev_attr_name.attr, 521 NULL 522 }; 523 524 static const struct attribute_group smsc47m1_group = { 525 .attrs = smsc47m1_attributes, 526 }; 527 528 static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data) 529 { 530 u8 val; 531 unsigned short addr; 532 int err; 533 534 err = superio_enter(); 535 if (err) 536 return err; 537 538 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); 539 540 /* 541 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x 542 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control. 543 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block" 544 * can do much more besides (device id 0x60). 545 * The LPC47M997 is undocumented, but seems to be compatible with 546 * the LPC47M192, and has the same device id. 547 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it 548 * supports a 3rd fan, and the pin configuration registers are 549 * unfortunately different. 550 * The LPC47M233 has the same device id (0x6B) but is not compatible. 551 * We check the high bit of the device revision register to 552 * differentiate them. 553 */ 554 switch (val) { 555 case 0x51: 556 pr_info("Found SMSC LPC47B27x\n"); 557 sio_data->type = smsc47m1; 558 break; 559 case 0x59: 560 pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n"); 561 sio_data->type = smsc47m1; 562 break; 563 case 0x5F: 564 pr_info("Found SMSC LPC47M14x\n"); 565 sio_data->type = smsc47m1; 566 break; 567 case 0x60: 568 pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n"); 569 sio_data->type = smsc47m1; 570 break; 571 case 0x6B: 572 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) { 573 pr_debug("Found SMSC LPC47M233, unsupported\n"); 574 superio_exit(); 575 return -ENODEV; 576 } 577 578 pr_info("Found SMSC LPC47M292\n"); 579 sio_data->type = smsc47m2; 580 break; 581 default: 582 superio_exit(); 583 return -ENODEV; 584 } 585 586 superio_select(); 587 addr = (superio_inb(SUPERIO_REG_BASE) << 8) 588 | superio_inb(SUPERIO_REG_BASE + 1); 589 if (addr == 0) { 590 pr_info("Device address not set, will not use\n"); 591 superio_exit(); 592 return -ENODEV; 593 } 594 595 /* 596 * Enable only if address is set (needed at least on the 597 * Compaq Presario S4000NX) 598 */ 599 sio_data->activate = superio_inb(SUPERIO_REG_ACT); 600 if ((sio_data->activate & 0x01) == 0) { 601 pr_info("Enabling device\n"); 602 superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01); 603 } 604 605 superio_exit(); 606 return addr; 607 } 608 609 /* Restore device to its initial state */ 610 static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data) 611 { 612 if ((sio_data->activate & 0x01) == 0) { 613 if (!superio_enter()) { 614 superio_select(); 615 pr_info("Disabling device\n"); 616 superio_outb(SUPERIO_REG_ACT, sio_data->activate); 617 superio_exit(); 618 } else { 619 pr_warn("Failed to disable device\n"); 620 } 621 } 622 } 623 624 #define CHECK 1 625 #define REQUEST 2 626 627 /* 628 * This function can be used to: 629 * - test for resource conflicts with ACPI 630 * - request the resources 631 * We only allocate the I/O ports we really need, to minimize the risk of 632 * conflicts with ACPI or with other drivers. 633 */ 634 static int __init smsc47m1_handle_resources(unsigned short address, 635 enum chips type, int action, 636 struct device *dev) 637 { 638 static const u8 ports_m1[] = { 639 /* register, region length */ 640 0x04, 1, 641 0x33, 4, 642 0x56, 7, 643 }; 644 645 static const u8 ports_m2[] = { 646 /* register, region length */ 647 0x04, 1, 648 0x09, 1, 649 0x2c, 2, 650 0x35, 4, 651 0x56, 7, 652 0x69, 4, 653 }; 654 655 int i, ports_size, err; 656 const u8 *ports; 657 658 switch (type) { 659 case smsc47m1: 660 default: 661 ports = ports_m1; 662 ports_size = ARRAY_SIZE(ports_m1); 663 break; 664 case smsc47m2: 665 ports = ports_m2; 666 ports_size = ARRAY_SIZE(ports_m2); 667 break; 668 } 669 670 for (i = 0; i + 1 < ports_size; i += 2) { 671 unsigned short start = address + ports[i]; 672 unsigned short len = ports[i + 1]; 673 674 switch (action) { 675 case CHECK: 676 /* Only check for conflicts */ 677 err = acpi_check_region(start, len, DRVNAME); 678 if (err) 679 return err; 680 break; 681 case REQUEST: 682 /* Request the resources */ 683 if (!devm_request_region(dev, start, len, DRVNAME)) { 684 dev_err(dev, 685 "Region 0x%hx-0x%hx already in use!\n", 686 start, start + len); 687 return -EBUSY; 688 } 689 break; 690 } 691 } 692 693 return 0; 694 } 695 696 static void smsc47m1_remove_files(struct device *dev) 697 { 698 sysfs_remove_group(&dev->kobj, &smsc47m1_group); 699 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1); 700 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2); 701 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3); 702 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1); 703 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2); 704 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3); 705 } 706 707 static int __init smsc47m1_probe(struct platform_device *pdev) 708 { 709 struct device *dev = &pdev->dev; 710 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev); 711 struct smsc47m1_data *data; 712 struct resource *res; 713 int err; 714 int fan1, fan2, fan3, pwm1, pwm2, pwm3; 715 716 static const char * const names[] = { 717 "smsc47m1", 718 "smsc47m2", 719 }; 720 721 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 722 err = smsc47m1_handle_resources(res->start, sio_data->type, 723 REQUEST, dev); 724 if (err < 0) 725 return err; 726 727 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL); 728 if (!data) 729 return -ENOMEM; 730 731 data->addr = res->start; 732 data->type = sio_data->type; 733 data->name = names[sio_data->type]; 734 mutex_init(&data->update_lock); 735 platform_set_drvdata(pdev, data); 736 737 /* 738 * If no function is properly configured, there's no point in 739 * actually registering the chip. 740 */ 741 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05) 742 == 0x04; 743 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05) 744 == 0x04; 745 if (data->type == smsc47m2) { 746 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1) 747 & 0x0d) == 0x09; 748 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2) 749 & 0x0d) == 0x09; 750 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3) 751 & 0x0d) == 0x0d; 752 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3) 753 & 0x0d) == 0x08; 754 } else { 755 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0)) 756 & 0x05) == 0x05; 757 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1)) 758 & 0x05) == 0x05; 759 fan3 = 0; 760 pwm3 = 0; 761 } 762 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) { 763 dev_warn(dev, "Device not configured, will not use\n"); 764 return -ENODEV; 765 } 766 767 /* 768 * Some values (fan min, clock dividers, pwm registers) may be 769 * needed before any update is triggered, so we better read them 770 * at least once here. We don't usually do it that way, but in 771 * this particular case, manually reading 5 registers out of 8 772 * doesn't make much sense and we're better using the existing 773 * function. 774 */ 775 smsc47m1_update_device(dev, 1); 776 777 /* Register sysfs hooks */ 778 if (fan1) { 779 err = sysfs_create_group(&dev->kobj, 780 &smsc47m1_group_fan1); 781 if (err) 782 goto error_remove_files; 783 } else 784 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n"); 785 786 if (fan2) { 787 err = sysfs_create_group(&dev->kobj, 788 &smsc47m1_group_fan2); 789 if (err) 790 goto error_remove_files; 791 } else 792 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n"); 793 794 if (fan3) { 795 err = sysfs_create_group(&dev->kobj, 796 &smsc47m1_group_fan3); 797 if (err) 798 goto error_remove_files; 799 } else if (data->type == smsc47m2) 800 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n"); 801 802 if (pwm1) { 803 err = sysfs_create_group(&dev->kobj, 804 &smsc47m1_group_pwm1); 805 if (err) 806 goto error_remove_files; 807 } else 808 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n"); 809 810 if (pwm2) { 811 err = sysfs_create_group(&dev->kobj, 812 &smsc47m1_group_pwm2); 813 if (err) 814 goto error_remove_files; 815 } else 816 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n"); 817 818 if (pwm3) { 819 err = sysfs_create_group(&dev->kobj, 820 &smsc47m1_group_pwm3); 821 if (err) 822 goto error_remove_files; 823 } else if (data->type == smsc47m2) 824 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n"); 825 826 err = sysfs_create_group(&dev->kobj, &smsc47m1_group); 827 if (err) 828 goto error_remove_files; 829 830 data->hwmon_dev = hwmon_device_register(dev); 831 if (IS_ERR(data->hwmon_dev)) { 832 err = PTR_ERR(data->hwmon_dev); 833 goto error_remove_files; 834 } 835 836 return 0; 837 838 error_remove_files: 839 smsc47m1_remove_files(dev); 840 return err; 841 } 842 843 static int __exit smsc47m1_remove(struct platform_device *pdev) 844 { 845 struct smsc47m1_data *data = platform_get_drvdata(pdev); 846 847 hwmon_device_unregister(data->hwmon_dev); 848 smsc47m1_remove_files(&pdev->dev); 849 850 return 0; 851 } 852 853 static struct platform_driver smsc47m1_driver = { 854 .driver = { 855 .name = DRVNAME, 856 }, 857 .remove = __exit_p(smsc47m1_remove), 858 }; 859 860 static int __init smsc47m1_device_add(unsigned short address, 861 const struct smsc47m1_sio_data *sio_data) 862 { 863 struct resource res = { 864 .start = address, 865 .end = address + SMSC_EXTENT - 1, 866 .name = DRVNAME, 867 .flags = IORESOURCE_IO, 868 }; 869 int err; 870 871 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL); 872 if (err) 873 goto exit; 874 875 pdev = platform_device_alloc(DRVNAME, address); 876 if (!pdev) { 877 err = -ENOMEM; 878 pr_err("Device allocation failed\n"); 879 goto exit; 880 } 881 882 err = platform_device_add_resources(pdev, &res, 1); 883 if (err) { 884 pr_err("Device resource addition failed (%d)\n", err); 885 goto exit_device_put; 886 } 887 888 err = platform_device_add_data(pdev, sio_data, 889 sizeof(struct smsc47m1_sio_data)); 890 if (err) { 891 pr_err("Platform data allocation failed\n"); 892 goto exit_device_put; 893 } 894 895 err = platform_device_add(pdev); 896 if (err) { 897 pr_err("Device addition failed (%d)\n", err); 898 goto exit_device_put; 899 } 900 901 return 0; 902 903 exit_device_put: 904 platform_device_put(pdev); 905 exit: 906 return err; 907 } 908 909 static int __init sm_smsc47m1_init(void) 910 { 911 int err; 912 unsigned short address; 913 struct smsc47m1_sio_data sio_data; 914 915 err = smsc47m1_find(&sio_data); 916 if (err < 0) 917 return err; 918 address = err; 919 920 /* Sets global pdev as a side effect */ 921 err = smsc47m1_device_add(address, &sio_data); 922 if (err) 923 return err; 924 925 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe); 926 if (err) 927 goto exit_device; 928 929 return 0; 930 931 exit_device: 932 platform_device_unregister(pdev); 933 smsc47m1_restore(&sio_data); 934 return err; 935 } 936 937 static void __exit sm_smsc47m1_exit(void) 938 { 939 platform_driver_unregister(&smsc47m1_driver); 940 smsc47m1_restore(dev_get_platdata(&pdev->dev)); 941 platform_device_unregister(pdev); 942 } 943 944 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>"); 945 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver"); 946 MODULE_LICENSE("GPL"); 947 948 module_init(sm_smsc47m1_init); 949 module_exit(sm_smsc47m1_exit); 950