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 } 355 356 /* Preserve fan min */ 357 tmp = 192 - (old_div * (192 - data->fan_preload[nr]) 358 + new_div / 2) / new_div; 359 data->fan_preload[nr] = clamp_val(tmp, 0, 191); 360 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 361 data->fan_preload[nr]); 362 mutex_unlock(&data->update_lock); 363 364 return count; 365 } 366 367 static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr, 368 const char *buf, size_t count) 369 { 370 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 371 struct smsc47m1_data *data = dev_get_drvdata(dev); 372 int nr = attr->index; 373 long val; 374 int err; 375 376 err = kstrtol(buf, 10, &val); 377 if (err) 378 return err; 379 380 if (val < 0 || val > 255) 381 return -EINVAL; 382 383 mutex_lock(&data->update_lock); 384 data->pwm[nr] &= 0x81; /* Preserve additional bits */ 385 data->pwm[nr] |= PWM_TO_REG(val); 386 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 387 data->pwm[nr]); 388 mutex_unlock(&data->update_lock); 389 390 return count; 391 } 392 393 static ssize_t pwm_en_store(struct device *dev, 394 struct device_attribute *devattr, const char *buf, 395 size_t count) 396 { 397 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 398 struct smsc47m1_data *data = dev_get_drvdata(dev); 399 int nr = attr->index; 400 unsigned long val; 401 int err; 402 403 err = kstrtoul(buf, 10, &val); 404 if (err) 405 return err; 406 407 if (val > 1) 408 return -EINVAL; 409 410 mutex_lock(&data->update_lock); 411 data->pwm[nr] &= 0xFE; /* preserve the other bits */ 412 data->pwm[nr] |= !val; 413 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 414 data->pwm[nr]); 415 mutex_unlock(&data->update_lock); 416 417 return count; 418 } 419 420 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); 421 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); 422 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); 423 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0); 424 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); 425 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_en, 0); 426 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); 427 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); 428 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); 429 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1); 430 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); 431 static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_en, 1); 432 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); 433 static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2); 434 static SENSOR_DEVICE_ATTR_RW(fan3_div, fan_div, 2); 435 static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2); 436 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2); 437 static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_en, 2); 438 439 static DEVICE_ATTR_RO(alarms); 440 441 static ssize_t name_show(struct device *dev, struct device_attribute 442 *devattr, char *buf) 443 { 444 struct smsc47m1_data *data = dev_get_drvdata(dev); 445 446 return sprintf(buf, "%s\n", data->name); 447 } 448 static DEVICE_ATTR_RO(name); 449 450 static struct attribute *smsc47m1_attributes_fan1[] = { 451 &sensor_dev_attr_fan1_input.dev_attr.attr, 452 &sensor_dev_attr_fan1_min.dev_attr.attr, 453 &sensor_dev_attr_fan1_div.dev_attr.attr, 454 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 455 NULL 456 }; 457 458 static const struct attribute_group smsc47m1_group_fan1 = { 459 .attrs = smsc47m1_attributes_fan1, 460 }; 461 462 static struct attribute *smsc47m1_attributes_fan2[] = { 463 &sensor_dev_attr_fan2_input.dev_attr.attr, 464 &sensor_dev_attr_fan2_min.dev_attr.attr, 465 &sensor_dev_attr_fan2_div.dev_attr.attr, 466 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 467 NULL 468 }; 469 470 static const struct attribute_group smsc47m1_group_fan2 = { 471 .attrs = smsc47m1_attributes_fan2, 472 }; 473 474 static struct attribute *smsc47m1_attributes_fan3[] = { 475 &sensor_dev_attr_fan3_input.dev_attr.attr, 476 &sensor_dev_attr_fan3_min.dev_attr.attr, 477 &sensor_dev_attr_fan3_div.dev_attr.attr, 478 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 479 NULL 480 }; 481 482 static const struct attribute_group smsc47m1_group_fan3 = { 483 .attrs = smsc47m1_attributes_fan3, 484 }; 485 486 static struct attribute *smsc47m1_attributes_pwm1[] = { 487 &sensor_dev_attr_pwm1.dev_attr.attr, 488 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 489 NULL 490 }; 491 492 static const struct attribute_group smsc47m1_group_pwm1 = { 493 .attrs = smsc47m1_attributes_pwm1, 494 }; 495 496 static struct attribute *smsc47m1_attributes_pwm2[] = { 497 &sensor_dev_attr_pwm2.dev_attr.attr, 498 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 499 NULL 500 }; 501 502 static const struct attribute_group smsc47m1_group_pwm2 = { 503 .attrs = smsc47m1_attributes_pwm2, 504 }; 505 506 static struct attribute *smsc47m1_attributes_pwm3[] = { 507 &sensor_dev_attr_pwm3.dev_attr.attr, 508 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 509 NULL 510 }; 511 512 static const struct attribute_group smsc47m1_group_pwm3 = { 513 .attrs = smsc47m1_attributes_pwm3, 514 }; 515 516 static struct attribute *smsc47m1_attributes[] = { 517 &dev_attr_alarms.attr, 518 &dev_attr_name.attr, 519 NULL 520 }; 521 522 static const struct attribute_group smsc47m1_group = { 523 .attrs = smsc47m1_attributes, 524 }; 525 526 static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data) 527 { 528 u8 val; 529 unsigned short addr; 530 int err; 531 532 err = superio_enter(); 533 if (err) 534 return err; 535 536 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 if (!superio_enter()) { 612 superio_select(); 613 pr_info("Disabling device\n"); 614 superio_outb(SUPERIO_REG_ACT, sio_data->activate); 615 superio_exit(); 616 } else { 617 pr_warn("Failed to disable device\n"); 618 } 619 } 620 } 621 622 #define CHECK 1 623 #define REQUEST 2 624 625 /* 626 * This function can be used to: 627 * - test for resource conflicts with ACPI 628 * - request the resources 629 * We only allocate the I/O ports we really need, to minimize the risk of 630 * conflicts with ACPI or with other drivers. 631 */ 632 static int __init smsc47m1_handle_resources(unsigned short address, 633 enum chips type, int action, 634 struct device *dev) 635 { 636 static const u8 ports_m1[] = { 637 /* register, region length */ 638 0x04, 1, 639 0x33, 4, 640 0x56, 7, 641 }; 642 643 static const u8 ports_m2[] = { 644 /* register, region length */ 645 0x04, 1, 646 0x09, 1, 647 0x2c, 2, 648 0x35, 4, 649 0x56, 7, 650 0x69, 4, 651 }; 652 653 int i, ports_size, err; 654 const u8 *ports; 655 656 switch (type) { 657 case smsc47m1: 658 default: 659 ports = ports_m1; 660 ports_size = ARRAY_SIZE(ports_m1); 661 break; 662 case smsc47m2: 663 ports = ports_m2; 664 ports_size = ARRAY_SIZE(ports_m2); 665 break; 666 } 667 668 for (i = 0; i + 1 < ports_size; i += 2) { 669 unsigned short start = address + ports[i]; 670 unsigned short len = ports[i + 1]; 671 672 switch (action) { 673 case CHECK: 674 /* Only check for conflicts */ 675 err = acpi_check_region(start, len, DRVNAME); 676 if (err) 677 return err; 678 break; 679 case REQUEST: 680 /* Request the resources */ 681 if (!devm_request_region(dev, start, len, DRVNAME)) { 682 dev_err(dev, 683 "Region 0x%hx-0x%hx already in use!\n", 684 start, start + len); 685 return -EBUSY; 686 } 687 break; 688 } 689 } 690 691 return 0; 692 } 693 694 static void smsc47m1_remove_files(struct device *dev) 695 { 696 sysfs_remove_group(&dev->kobj, &smsc47m1_group); 697 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1); 698 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2); 699 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3); 700 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1); 701 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2); 702 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3); 703 } 704 705 static int __init smsc47m1_probe(struct platform_device *pdev) 706 { 707 struct device *dev = &pdev->dev; 708 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev); 709 struct smsc47m1_data *data; 710 struct resource *res; 711 int err; 712 int fan1, fan2, fan3, pwm1, pwm2, pwm3; 713 714 static const char * const names[] = { 715 "smsc47m1", 716 "smsc47m2", 717 }; 718 719 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 720 err = smsc47m1_handle_resources(res->start, sio_data->type, 721 REQUEST, dev); 722 if (err < 0) 723 return err; 724 725 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL); 726 if (!data) 727 return -ENOMEM; 728 729 data->addr = res->start; 730 data->type = sio_data->type; 731 data->name = names[sio_data->type]; 732 mutex_init(&data->update_lock); 733 platform_set_drvdata(pdev, data); 734 735 /* 736 * If no function is properly configured, there's no point in 737 * actually registering the chip. 738 */ 739 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05) 740 == 0x04; 741 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05) 742 == 0x04; 743 if (data->type == smsc47m2) { 744 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1) 745 & 0x0d) == 0x09; 746 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2) 747 & 0x0d) == 0x09; 748 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3) 749 & 0x0d) == 0x0d; 750 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3) 751 & 0x0d) == 0x08; 752 } else { 753 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0)) 754 & 0x05) == 0x05; 755 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1)) 756 & 0x05) == 0x05; 757 fan3 = 0; 758 pwm3 = 0; 759 } 760 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) { 761 dev_warn(dev, "Device not configured, will not use\n"); 762 return -ENODEV; 763 } 764 765 /* 766 * Some values (fan min, clock dividers, pwm registers) may be 767 * needed before any update is triggered, so we better read them 768 * at least once here. We don't usually do it that way, but in 769 * this particular case, manually reading 5 registers out of 8 770 * doesn't make much sense and we're better using the existing 771 * function. 772 */ 773 smsc47m1_update_device(dev, 1); 774 775 /* Register sysfs hooks */ 776 if (fan1) { 777 err = sysfs_create_group(&dev->kobj, 778 &smsc47m1_group_fan1); 779 if (err) 780 goto error_remove_files; 781 } else 782 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n"); 783 784 if (fan2) { 785 err = sysfs_create_group(&dev->kobj, 786 &smsc47m1_group_fan2); 787 if (err) 788 goto error_remove_files; 789 } else 790 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n"); 791 792 if (fan3) { 793 err = sysfs_create_group(&dev->kobj, 794 &smsc47m1_group_fan3); 795 if (err) 796 goto error_remove_files; 797 } else if (data->type == smsc47m2) 798 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n"); 799 800 if (pwm1) { 801 err = sysfs_create_group(&dev->kobj, 802 &smsc47m1_group_pwm1); 803 if (err) 804 goto error_remove_files; 805 } else 806 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n"); 807 808 if (pwm2) { 809 err = sysfs_create_group(&dev->kobj, 810 &smsc47m1_group_pwm2); 811 if (err) 812 goto error_remove_files; 813 } else 814 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n"); 815 816 if (pwm3) { 817 err = sysfs_create_group(&dev->kobj, 818 &smsc47m1_group_pwm3); 819 if (err) 820 goto error_remove_files; 821 } else if (data->type == smsc47m2) 822 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n"); 823 824 err = sysfs_create_group(&dev->kobj, &smsc47m1_group); 825 if (err) 826 goto error_remove_files; 827 828 data->hwmon_dev = hwmon_device_register(dev); 829 if (IS_ERR(data->hwmon_dev)) { 830 err = PTR_ERR(data->hwmon_dev); 831 goto error_remove_files; 832 } 833 834 return 0; 835 836 error_remove_files: 837 smsc47m1_remove_files(dev); 838 return err; 839 } 840 841 static int __exit smsc47m1_remove(struct platform_device *pdev) 842 { 843 struct smsc47m1_data *data = platform_get_drvdata(pdev); 844 845 hwmon_device_unregister(data->hwmon_dev); 846 smsc47m1_remove_files(&pdev->dev); 847 848 return 0; 849 } 850 851 static struct platform_driver smsc47m1_driver = { 852 .driver = { 853 .name = DRVNAME, 854 }, 855 .remove = __exit_p(smsc47m1_remove), 856 }; 857 858 static int __init smsc47m1_device_add(unsigned short address, 859 const struct smsc47m1_sio_data *sio_data) 860 { 861 struct resource res = { 862 .start = address, 863 .end = address + SMSC_EXTENT - 1, 864 .name = DRVNAME, 865 .flags = IORESOURCE_IO, 866 }; 867 int err; 868 869 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL); 870 if (err) 871 goto exit; 872 873 pdev = platform_device_alloc(DRVNAME, address); 874 if (!pdev) { 875 err = -ENOMEM; 876 pr_err("Device allocation failed\n"); 877 goto exit; 878 } 879 880 err = platform_device_add_resources(pdev, &res, 1); 881 if (err) { 882 pr_err("Device resource addition failed (%d)\n", err); 883 goto exit_device_put; 884 } 885 886 err = platform_device_add_data(pdev, sio_data, 887 sizeof(struct smsc47m1_sio_data)); 888 if (err) { 889 pr_err("Platform data allocation failed\n"); 890 goto exit_device_put; 891 } 892 893 err = platform_device_add(pdev); 894 if (err) { 895 pr_err("Device addition failed (%d)\n", err); 896 goto exit_device_put; 897 } 898 899 return 0; 900 901 exit_device_put: 902 platform_device_put(pdev); 903 exit: 904 return err; 905 } 906 907 static int __init sm_smsc47m1_init(void) 908 { 909 int err; 910 unsigned short address; 911 struct smsc47m1_sio_data sio_data; 912 913 err = smsc47m1_find(&sio_data); 914 if (err < 0) 915 return err; 916 address = err; 917 918 /* Sets global pdev as a side effect */ 919 err = smsc47m1_device_add(address, &sio_data); 920 if (err) 921 return err; 922 923 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe); 924 if (err) 925 goto exit_device; 926 927 return 0; 928 929 exit_device: 930 platform_device_unregister(pdev); 931 smsc47m1_restore(&sio_data); 932 return err; 933 } 934 935 static void __exit sm_smsc47m1_exit(void) 936 { 937 platform_driver_unregister(&smsc47m1_driver); 938 smsc47m1_restore(dev_get_platdata(&pdev->dev)); 939 platform_device_unregister(pdev); 940 } 941 942 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>"); 943 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver"); 944 MODULE_LICENSE("GPL"); 945 946 module_init(sm_smsc47m1_init); 947 module_exit(sm_smsc47m1_exit); 948