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 <khali@linux-fr.org> 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 }; 144 145 146 static int __exit smsc47m1_remove(struct platform_device *pdev); 147 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev, 148 int init); 149 150 static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg) 151 { 152 return inb_p(data->addr + reg); 153 } 154 155 static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg, 156 u8 value) 157 { 158 outb_p(value, data->addr + reg); 159 } 160 161 static struct platform_driver smsc47m1_driver = { 162 .driver = { 163 .owner = THIS_MODULE, 164 .name = DRVNAME, 165 }, 166 .remove = __exit_p(smsc47m1_remove), 167 }; 168 169 static ssize_t get_fan(struct device *dev, struct device_attribute 170 *devattr, char *buf) 171 { 172 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 173 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 174 int nr = attr->index; 175 /* 176 * This chip (stupidly) stops monitoring fan speed if PWM is 177 * enabled and duty cycle is 0%. This is fine if the monitoring 178 * and control concern the same fan, but troublesome if they are 179 * not (which could as well happen). 180 */ 181 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 : 182 FAN_FROM_REG(data->fan[nr], 183 DIV_FROM_REG(data->fan_div[nr]), 184 data->fan_preload[nr]); 185 return sprintf(buf, "%d\n", rpm); 186 } 187 188 static ssize_t get_fan_min(struct device *dev, struct device_attribute 189 *devattr, char *buf) 190 { 191 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 192 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 193 int nr = attr->index; 194 int rpm = MIN_FROM_REG(data->fan_preload[nr], 195 DIV_FROM_REG(data->fan_div[nr])); 196 return sprintf(buf, "%d\n", rpm); 197 } 198 199 static ssize_t get_fan_div(struct device *dev, struct device_attribute 200 *devattr, char *buf) 201 { 202 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 203 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 204 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); 205 } 206 207 static ssize_t get_fan_alarm(struct device *dev, struct device_attribute 208 *devattr, char *buf) 209 { 210 int bitnr = to_sensor_dev_attr(devattr)->index; 211 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 212 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 213 } 214 215 static ssize_t get_pwm(struct device *dev, struct device_attribute 216 *devattr, char *buf) 217 { 218 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 219 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 220 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index])); 221 } 222 223 static ssize_t get_pwm_en(struct device *dev, struct device_attribute 224 *devattr, char *buf) 225 { 226 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 227 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 228 return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index])); 229 } 230 231 static ssize_t get_alarms(struct device *dev, struct device_attribute 232 *devattr, char *buf) 233 { 234 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 235 return sprintf(buf, "%d\n", data->alarms); 236 } 237 238 static ssize_t set_fan_min(struct device *dev, struct device_attribute 239 *devattr, const char *buf, size_t count) 240 { 241 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 242 struct smsc47m1_data *data = dev_get_drvdata(dev); 243 int nr = attr->index; 244 long rpmdiv; 245 long val; 246 int err; 247 248 err = kstrtol(buf, 10, &val); 249 if (err) 250 return err; 251 252 mutex_lock(&data->update_lock); 253 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]); 254 255 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) { 256 mutex_unlock(&data->update_lock); 257 return -EINVAL; 258 } 259 260 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv); 261 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 262 data->fan_preload[nr]); 263 mutex_unlock(&data->update_lock); 264 265 return count; 266 } 267 268 /* 269 * Note: we save and restore the fan minimum here, because its value is 270 * determined in part by the fan clock divider. This follows the principle 271 * of least surprise; the user doesn't expect the fan minimum to change just 272 * because the divider changed. 273 */ 274 static ssize_t set_fan_div(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 new_div; 281 int err; 282 long tmp; 283 u8 old_div = DIV_FROM_REG(data->fan_div[nr]); 284 285 err = kstrtol(buf, 10, &new_div); 286 if (err) 287 return err; 288 289 if (new_div == old_div) /* No change */ 290 return count; 291 292 mutex_lock(&data->update_lock); 293 switch (new_div) { 294 case 1: 295 data->fan_div[nr] = 0; 296 break; 297 case 2: 298 data->fan_div[nr] = 1; 299 break; 300 case 4: 301 data->fan_div[nr] = 2; 302 break; 303 case 8: 304 data->fan_div[nr] = 3; 305 break; 306 default: 307 mutex_unlock(&data->update_lock); 308 return -EINVAL; 309 } 310 311 switch (nr) { 312 case 0: 313 case 1: 314 tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV) 315 & ~(0x03 << (4 + 2 * nr)); 316 tmp |= data->fan_div[nr] << (4 + 2 * nr); 317 smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp); 318 break; 319 case 2: 320 tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF; 321 tmp |= data->fan_div[2] << 4; 322 smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp); 323 break; 324 } 325 326 /* Preserve fan min */ 327 tmp = 192 - (old_div * (192 - data->fan_preload[nr]) 328 + new_div / 2) / new_div; 329 data->fan_preload[nr] = clamp_val(tmp, 0, 191); 330 smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], 331 data->fan_preload[nr]); 332 mutex_unlock(&data->update_lock); 333 334 return count; 335 } 336 337 static ssize_t set_pwm(struct device *dev, struct device_attribute 338 *devattr, const char *buf, size_t count) 339 { 340 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 341 struct smsc47m1_data *data = dev_get_drvdata(dev); 342 int nr = attr->index; 343 long val; 344 int err; 345 346 err = kstrtol(buf, 10, &val); 347 if (err) 348 return err; 349 350 if (val < 0 || val > 255) 351 return -EINVAL; 352 353 mutex_lock(&data->update_lock); 354 data->pwm[nr] &= 0x81; /* Preserve additional bits */ 355 data->pwm[nr] |= PWM_TO_REG(val); 356 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 357 data->pwm[nr]); 358 mutex_unlock(&data->update_lock); 359 360 return count; 361 } 362 363 static ssize_t set_pwm_en(struct device *dev, struct device_attribute 364 *devattr, const char *buf, size_t count) 365 { 366 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 367 struct smsc47m1_data *data = dev_get_drvdata(dev); 368 int nr = attr->index; 369 unsigned long val; 370 int err; 371 372 err = kstrtoul(buf, 10, &val); 373 if (err) 374 return err; 375 376 if (val > 1) 377 return -EINVAL; 378 379 mutex_lock(&data->update_lock); 380 data->pwm[nr] &= 0xFE; /* preserve the other bits */ 381 data->pwm[nr] |= !val; 382 smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr], 383 data->pwm[nr]); 384 mutex_unlock(&data->update_lock); 385 386 return count; 387 } 388 389 #define fan_present(offset) \ 390 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan, \ 391 NULL, offset - 1); \ 392 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 393 get_fan_min, set_fan_min, offset - 1); \ 394 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 395 get_fan_div, set_fan_div, offset - 1); \ 396 static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm, \ 397 NULL, offset - 1); \ 398 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \ 399 get_pwm, set_pwm, offset - 1); \ 400 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \ 401 get_pwm_en, set_pwm_en, offset - 1) 402 403 fan_present(1); 404 fan_present(2); 405 fan_present(3); 406 407 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL); 408 409 static ssize_t show_name(struct device *dev, struct device_attribute 410 *devattr, char *buf) 411 { 412 struct smsc47m1_data *data = dev_get_drvdata(dev); 413 414 return sprintf(buf, "%s\n", data->name); 415 } 416 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 417 418 static struct attribute *smsc47m1_attributes_fan1[] = { 419 &sensor_dev_attr_fan1_input.dev_attr.attr, 420 &sensor_dev_attr_fan1_min.dev_attr.attr, 421 &sensor_dev_attr_fan1_div.dev_attr.attr, 422 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 423 NULL 424 }; 425 426 static const struct attribute_group smsc47m1_group_fan1 = { 427 .attrs = smsc47m1_attributes_fan1, 428 }; 429 430 static struct attribute *smsc47m1_attributes_fan2[] = { 431 &sensor_dev_attr_fan2_input.dev_attr.attr, 432 &sensor_dev_attr_fan2_min.dev_attr.attr, 433 &sensor_dev_attr_fan2_div.dev_attr.attr, 434 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 435 NULL 436 }; 437 438 static const struct attribute_group smsc47m1_group_fan2 = { 439 .attrs = smsc47m1_attributes_fan2, 440 }; 441 442 static struct attribute *smsc47m1_attributes_fan3[] = { 443 &sensor_dev_attr_fan3_input.dev_attr.attr, 444 &sensor_dev_attr_fan3_min.dev_attr.attr, 445 &sensor_dev_attr_fan3_div.dev_attr.attr, 446 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 447 NULL 448 }; 449 450 static const struct attribute_group smsc47m1_group_fan3 = { 451 .attrs = smsc47m1_attributes_fan3, 452 }; 453 454 static struct attribute *smsc47m1_attributes_pwm1[] = { 455 &sensor_dev_attr_pwm1.dev_attr.attr, 456 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 457 NULL 458 }; 459 460 static const struct attribute_group smsc47m1_group_pwm1 = { 461 .attrs = smsc47m1_attributes_pwm1, 462 }; 463 464 static struct attribute *smsc47m1_attributes_pwm2[] = { 465 &sensor_dev_attr_pwm2.dev_attr.attr, 466 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 467 NULL 468 }; 469 470 static const struct attribute_group smsc47m1_group_pwm2 = { 471 .attrs = smsc47m1_attributes_pwm2, 472 }; 473 474 static struct attribute *smsc47m1_attributes_pwm3[] = { 475 &sensor_dev_attr_pwm3.dev_attr.attr, 476 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 477 NULL 478 }; 479 480 static const struct attribute_group smsc47m1_group_pwm3 = { 481 .attrs = smsc47m1_attributes_pwm3, 482 }; 483 484 static struct attribute *smsc47m1_attributes[] = { 485 &dev_attr_alarms.attr, 486 &dev_attr_name.attr, 487 NULL 488 }; 489 490 static const struct attribute_group smsc47m1_group = { 491 .attrs = smsc47m1_attributes, 492 }; 493 494 static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data) 495 { 496 u8 val; 497 unsigned short addr; 498 499 superio_enter(); 500 val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); 501 502 /* 503 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x 504 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control. 505 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block" 506 * can do much more besides (device id 0x60). 507 * The LPC47M997 is undocumented, but seems to be compatible with 508 * the LPC47M192, and has the same device id. 509 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it 510 * supports a 3rd fan, and the pin configuration registers are 511 * unfortunately different. 512 * The LPC47M233 has the same device id (0x6B) but is not compatible. 513 * We check the high bit of the device revision register to 514 * differentiate them. 515 */ 516 switch (val) { 517 case 0x51: 518 pr_info("Found SMSC LPC47B27x\n"); 519 sio_data->type = smsc47m1; 520 break; 521 case 0x59: 522 pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n"); 523 sio_data->type = smsc47m1; 524 break; 525 case 0x5F: 526 pr_info("Found SMSC LPC47M14x\n"); 527 sio_data->type = smsc47m1; 528 break; 529 case 0x60: 530 pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n"); 531 sio_data->type = smsc47m1; 532 break; 533 case 0x6B: 534 if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) { 535 pr_debug("Found SMSC LPC47M233, unsupported\n"); 536 superio_exit(); 537 return -ENODEV; 538 } 539 540 pr_info("Found SMSC LPC47M292\n"); 541 sio_data->type = smsc47m2; 542 break; 543 default: 544 superio_exit(); 545 return -ENODEV; 546 } 547 548 superio_select(); 549 addr = (superio_inb(SUPERIO_REG_BASE) << 8) 550 | superio_inb(SUPERIO_REG_BASE + 1); 551 if (addr == 0) { 552 pr_info("Device address not set, will not use\n"); 553 superio_exit(); 554 return -ENODEV; 555 } 556 557 /* 558 * Enable only if address is set (needed at least on the 559 * Compaq Presario S4000NX) 560 */ 561 sio_data->activate = superio_inb(SUPERIO_REG_ACT); 562 if ((sio_data->activate & 0x01) == 0) { 563 pr_info("Enabling device\n"); 564 superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01); 565 } 566 567 superio_exit(); 568 return addr; 569 } 570 571 /* Restore device to its initial state */ 572 static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data) 573 { 574 if ((sio_data->activate & 0x01) == 0) { 575 superio_enter(); 576 superio_select(); 577 578 pr_info("Disabling device\n"); 579 superio_outb(SUPERIO_REG_ACT, sio_data->activate); 580 581 superio_exit(); 582 } 583 } 584 585 #define CHECK 1 586 #define REQUEST 2 587 588 /* 589 * This function can be used to: 590 * - test for resource conflicts with ACPI 591 * - request the resources 592 * We only allocate the I/O ports we really need, to minimize the risk of 593 * conflicts with ACPI or with other drivers. 594 */ 595 static int __init smsc47m1_handle_resources(unsigned short address, 596 enum chips type, int action, 597 struct device *dev) 598 { 599 static const u8 ports_m1[] = { 600 /* register, region length */ 601 0x04, 1, 602 0x33, 4, 603 0x56, 7, 604 }; 605 606 static const u8 ports_m2[] = { 607 /* register, region length */ 608 0x04, 1, 609 0x09, 1, 610 0x2c, 2, 611 0x35, 4, 612 0x56, 7, 613 0x69, 4, 614 }; 615 616 int i, ports_size, err; 617 const u8 *ports; 618 619 switch (type) { 620 case smsc47m1: 621 default: 622 ports = ports_m1; 623 ports_size = ARRAY_SIZE(ports_m1); 624 break; 625 case smsc47m2: 626 ports = ports_m2; 627 ports_size = ARRAY_SIZE(ports_m2); 628 break; 629 } 630 631 for (i = 0; i + 1 < ports_size; i += 2) { 632 unsigned short start = address + ports[i]; 633 unsigned short len = ports[i + 1]; 634 635 switch (action) { 636 case CHECK: 637 /* Only check for conflicts */ 638 err = acpi_check_region(start, len, DRVNAME); 639 if (err) 640 return err; 641 break; 642 case REQUEST: 643 /* Request the resources */ 644 if (!devm_request_region(dev, start, len, DRVNAME)) { 645 dev_err(dev, 646 "Region 0x%hx-0x%hx already in use!\n", 647 start, start + len); 648 return -EBUSY; 649 } 650 break; 651 } 652 } 653 654 return 0; 655 } 656 657 static void smsc47m1_remove_files(struct device *dev) 658 { 659 sysfs_remove_group(&dev->kobj, &smsc47m1_group); 660 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1); 661 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2); 662 sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3); 663 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1); 664 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2); 665 sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3); 666 } 667 668 static int __init smsc47m1_probe(struct platform_device *pdev) 669 { 670 struct device *dev = &pdev->dev; 671 struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev); 672 struct smsc47m1_data *data; 673 struct resource *res; 674 int err; 675 int fan1, fan2, fan3, pwm1, pwm2, pwm3; 676 677 static const char * const names[] = { 678 "smsc47m1", 679 "smsc47m2", 680 }; 681 682 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 683 err = smsc47m1_handle_resources(res->start, sio_data->type, 684 REQUEST, dev); 685 if (err < 0) 686 return err; 687 688 data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL); 689 if (!data) 690 return -ENOMEM; 691 692 data->addr = res->start; 693 data->type = sio_data->type; 694 data->name = names[sio_data->type]; 695 mutex_init(&data->update_lock); 696 platform_set_drvdata(pdev, data); 697 698 /* 699 * If no function is properly configured, there's no point in 700 * actually registering the chip. 701 */ 702 pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05) 703 == 0x04; 704 pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05) 705 == 0x04; 706 if (data->type == smsc47m2) { 707 fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1) 708 & 0x0d) == 0x09; 709 fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2) 710 & 0x0d) == 0x09; 711 fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3) 712 & 0x0d) == 0x0d; 713 pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3) 714 & 0x0d) == 0x08; 715 } else { 716 fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0)) 717 & 0x05) == 0x05; 718 fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1)) 719 & 0x05) == 0x05; 720 fan3 = 0; 721 pwm3 = 0; 722 } 723 if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) { 724 dev_warn(dev, "Device not configured, will not use\n"); 725 return -ENODEV; 726 } 727 728 /* 729 * Some values (fan min, clock dividers, pwm registers) may be 730 * needed before any update is triggered, so we better read them 731 * at least once here. We don't usually do it that way, but in 732 * this particular case, manually reading 5 registers out of 8 733 * doesn't make much sense and we're better using the existing 734 * function. 735 */ 736 smsc47m1_update_device(dev, 1); 737 738 /* Register sysfs hooks */ 739 if (fan1) { 740 err = sysfs_create_group(&dev->kobj, 741 &smsc47m1_group_fan1); 742 if (err) 743 goto error_remove_files; 744 } else 745 dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n"); 746 747 if (fan2) { 748 err = sysfs_create_group(&dev->kobj, 749 &smsc47m1_group_fan2); 750 if (err) 751 goto error_remove_files; 752 } else 753 dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n"); 754 755 if (fan3) { 756 err = sysfs_create_group(&dev->kobj, 757 &smsc47m1_group_fan3); 758 if (err) 759 goto error_remove_files; 760 } else if (data->type == smsc47m2) 761 dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n"); 762 763 if (pwm1) { 764 err = sysfs_create_group(&dev->kobj, 765 &smsc47m1_group_pwm1); 766 if (err) 767 goto error_remove_files; 768 } else 769 dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n"); 770 771 if (pwm2) { 772 err = sysfs_create_group(&dev->kobj, 773 &smsc47m1_group_pwm2); 774 if (err) 775 goto error_remove_files; 776 } else 777 dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n"); 778 779 if (pwm3) { 780 err = sysfs_create_group(&dev->kobj, 781 &smsc47m1_group_pwm3); 782 if (err) 783 goto error_remove_files; 784 } else if (data->type == smsc47m2) 785 dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n"); 786 787 err = sysfs_create_group(&dev->kobj, &smsc47m1_group); 788 if (err) 789 goto error_remove_files; 790 791 data->hwmon_dev = hwmon_device_register(dev); 792 if (IS_ERR(data->hwmon_dev)) { 793 err = PTR_ERR(data->hwmon_dev); 794 goto error_remove_files; 795 } 796 797 return 0; 798 799 error_remove_files: 800 smsc47m1_remove_files(dev); 801 return err; 802 } 803 804 static int __exit smsc47m1_remove(struct platform_device *pdev) 805 { 806 struct smsc47m1_data *data = platform_get_drvdata(pdev); 807 808 hwmon_device_unregister(data->hwmon_dev); 809 smsc47m1_remove_files(&pdev->dev); 810 811 return 0; 812 } 813 814 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev, 815 int init) 816 { 817 struct smsc47m1_data *data = dev_get_drvdata(dev); 818 819 mutex_lock(&data->update_lock); 820 821 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) { 822 int i, fan_nr; 823 fan_nr = data->type == smsc47m2 ? 3 : 2; 824 825 for (i = 0; i < fan_nr; i++) { 826 data->fan[i] = smsc47m1_read_value(data, 827 SMSC47M1_REG_FAN[i]); 828 data->fan_preload[i] = smsc47m1_read_value(data, 829 SMSC47M1_REG_FAN_PRELOAD[i]); 830 data->pwm[i] = smsc47m1_read_value(data, 831 SMSC47M1_REG_PWM[i]); 832 } 833 834 i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV); 835 data->fan_div[0] = (i >> 4) & 0x03; 836 data->fan_div[1] = i >> 6; 837 838 data->alarms = smsc47m1_read_value(data, 839 SMSC47M1_REG_ALARM) >> 6; 840 /* Clear alarms if needed */ 841 if (data->alarms) 842 smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0); 843 844 if (fan_nr >= 3) { 845 data->fan_div[2] = (smsc47m1_read_value(data, 846 SMSC47M2_REG_FANDIV3) >> 4) & 0x03; 847 data->alarms |= (smsc47m1_read_value(data, 848 SMSC47M2_REG_ALARM6) & 0x40) >> 4; 849 /* Clear alarm if needed */ 850 if (data->alarms & 0x04) 851 smsc47m1_write_value(data, 852 SMSC47M2_REG_ALARM6, 853 0x40); 854 } 855 856 data->last_updated = jiffies; 857 } 858 859 mutex_unlock(&data->update_lock); 860 return data; 861 } 862 863 static int __init smsc47m1_device_add(unsigned short address, 864 const struct smsc47m1_sio_data *sio_data) 865 { 866 struct resource res = { 867 .start = address, 868 .end = address + SMSC_EXTENT - 1, 869 .name = DRVNAME, 870 .flags = IORESOURCE_IO, 871 }; 872 int err; 873 874 err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL); 875 if (err) 876 goto exit; 877 878 pdev = platform_device_alloc(DRVNAME, address); 879 if (!pdev) { 880 err = -ENOMEM; 881 pr_err("Device allocation failed\n"); 882 goto exit; 883 } 884 885 err = platform_device_add_resources(pdev, &res, 1); 886 if (err) { 887 pr_err("Device resource addition failed (%d)\n", err); 888 goto exit_device_put; 889 } 890 891 err = platform_device_add_data(pdev, sio_data, 892 sizeof(struct smsc47m1_sio_data)); 893 if (err) { 894 pr_err("Platform data allocation failed\n"); 895 goto exit_device_put; 896 } 897 898 err = platform_device_add(pdev); 899 if (err) { 900 pr_err("Device addition failed (%d)\n", err); 901 goto exit_device_put; 902 } 903 904 return 0; 905 906 exit_device_put: 907 platform_device_put(pdev); 908 exit: 909 return err; 910 } 911 912 static int __init sm_smsc47m1_init(void) 913 { 914 int err; 915 unsigned short address; 916 struct smsc47m1_sio_data sio_data; 917 918 err = smsc47m1_find(&sio_data); 919 if (err < 0) 920 return err; 921 address = err; 922 923 /* Sets global pdev as a side effect */ 924 err = smsc47m1_device_add(address, &sio_data); 925 if (err) 926 return err; 927 928 err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe); 929 if (err) 930 goto exit_device; 931 932 return 0; 933 934 exit_device: 935 platform_device_unregister(pdev); 936 smsc47m1_restore(&sio_data); 937 return err; 938 } 939 940 static void __exit sm_smsc47m1_exit(void) 941 { 942 platform_driver_unregister(&smsc47m1_driver); 943 smsc47m1_restore(dev_get_platdata(&pdev->dev)); 944 platform_device_unregister(pdev); 945 } 946 947 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>"); 948 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver"); 949 MODULE_LICENSE("GPL"); 950 951 module_init(sm_smsc47m1_init); 952 module_exit(sm_smsc47m1_exit); 953