1 /*************************************************************************** 2 * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com> * 3 * * 4 * This program is free software; you can redistribute it and/or modify * 5 * it under the terms of the GNU General Public License as published by * 6 * the Free Software Foundation; either version 2 of the License, or * 7 * (at your option) any later version. * 8 * * 9 * This program is distributed in the hope that it will be useful, * 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 12 * GNU General Public License for more details. * 13 * * 14 * You should have received a copy of the GNU General Public License * 15 * along with this program; if not, write to the * 16 * Free Software Foundation, Inc., * 17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * 18 ***************************************************************************/ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/jiffies.h> 26 #include <linux/platform_device.h> 27 #include <linux/hwmon.h> 28 #include <linux/hwmon-sysfs.h> 29 #include <linux/err.h> 30 #include <linux/mutex.h> 31 #include "sch56xx-common.h" 32 33 #define DRVNAME "sch5636" 34 #define DEVNAME "theseus" /* We only support one model for now */ 35 36 #define SCH5636_REG_FUJITSU_ID 0x780 37 #define SCH5636_REG_FUJITSU_REV 0x783 38 39 #define SCH5636_NO_INS 5 40 #define SCH5636_NO_TEMPS 16 41 #define SCH5636_NO_FANS 8 42 43 static const u16 SCH5636_REG_IN_VAL[SCH5636_NO_INS] = { 44 0x22, 0x23, 0x24, 0x25, 0x189 }; 45 static const u16 SCH5636_REG_IN_FACTORS[SCH5636_NO_INS] = { 46 4400, 1500, 4000, 4400, 16000 }; 47 static const char * const SCH5636_IN_LABELS[SCH5636_NO_INS] = { 48 "3.3V", "VREF", "VBAT", "3.3AUX", "12V" }; 49 50 static const u16 SCH5636_REG_TEMP_VAL[SCH5636_NO_TEMPS] = { 51 0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181, 52 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C }; 53 #define SCH5636_REG_TEMP_CTRL(i) (0x790 + (i)) 54 #define SCH5636_TEMP_WORKING 0x01 55 #define SCH5636_TEMP_ALARM 0x02 56 #define SCH5636_TEMP_DEACTIVATED 0x80 57 58 static const u16 SCH5636_REG_FAN_VAL[SCH5636_NO_FANS] = { 59 0x2C, 0x2E, 0x30, 0x32, 0x62, 0x64, 0x66, 0x68 }; 60 #define SCH5636_REG_FAN_CTRL(i) (0x880 + (i)) 61 /* FAULT in datasheet, but acts as an alarm */ 62 #define SCH5636_FAN_ALARM 0x04 63 #define SCH5636_FAN_NOT_PRESENT 0x08 64 #define SCH5636_FAN_DEACTIVATED 0x80 65 66 67 struct sch5636_data { 68 unsigned short addr; 69 struct device *hwmon_dev; 70 71 struct mutex update_lock; 72 char valid; /* !=0 if following fields are valid */ 73 unsigned long last_updated; /* In jiffies */ 74 u8 in[SCH5636_NO_INS]; 75 u8 temp_val[SCH5636_NO_TEMPS]; 76 u8 temp_ctrl[SCH5636_NO_TEMPS]; 77 u16 fan_val[SCH5636_NO_FANS]; 78 u8 fan_ctrl[SCH5636_NO_FANS]; 79 }; 80 81 static struct sch5636_data *sch5636_update_device(struct device *dev) 82 { 83 struct sch5636_data *data = dev_get_drvdata(dev); 84 struct sch5636_data *ret = data; 85 int i, val; 86 87 mutex_lock(&data->update_lock); 88 89 /* Cache the values for 1 second */ 90 if (data->valid && !time_after(jiffies, data->last_updated + HZ)) 91 goto abort; 92 93 for (i = 0; i < SCH5636_NO_INS; i++) { 94 val = sch56xx_read_virtual_reg(data->addr, 95 SCH5636_REG_IN_VAL[i]); 96 if (unlikely(val < 0)) { 97 ret = ERR_PTR(val); 98 goto abort; 99 } 100 data->in[i] = val; 101 } 102 103 for (i = 0; i < SCH5636_NO_TEMPS; i++) { 104 if (data->temp_ctrl[i] & SCH5636_TEMP_DEACTIVATED) 105 continue; 106 107 val = sch56xx_read_virtual_reg(data->addr, 108 SCH5636_REG_TEMP_VAL[i]); 109 if (unlikely(val < 0)) { 110 ret = ERR_PTR(val); 111 goto abort; 112 } 113 data->temp_val[i] = val; 114 115 val = sch56xx_read_virtual_reg(data->addr, 116 SCH5636_REG_TEMP_CTRL(i)); 117 if (unlikely(val < 0)) { 118 ret = ERR_PTR(val); 119 goto abort; 120 } 121 data->temp_ctrl[i] = val; 122 /* Alarms need to be explicitly write-cleared */ 123 if (val & SCH5636_TEMP_ALARM) { 124 sch56xx_write_virtual_reg(data->addr, 125 SCH5636_REG_TEMP_CTRL(i), val); 126 } 127 } 128 129 for (i = 0; i < SCH5636_NO_FANS; i++) { 130 if (data->fan_ctrl[i] & SCH5636_FAN_DEACTIVATED) 131 continue; 132 133 val = sch56xx_read_virtual_reg16(data->addr, 134 SCH5636_REG_FAN_VAL[i]); 135 if (unlikely(val < 0)) { 136 ret = ERR_PTR(val); 137 goto abort; 138 } 139 data->fan_val[i] = val; 140 141 val = sch56xx_read_virtual_reg(data->addr, 142 SCH5636_REG_FAN_CTRL(i)); 143 if (unlikely(val < 0)) { 144 ret = ERR_PTR(val); 145 goto abort; 146 } 147 data->fan_ctrl[i] = val; 148 /* Alarms need to be explicitly write-cleared */ 149 if (val & SCH5636_FAN_ALARM) { 150 sch56xx_write_virtual_reg(data->addr, 151 SCH5636_REG_FAN_CTRL(i), val); 152 } 153 } 154 155 data->last_updated = jiffies; 156 data->valid = 1; 157 abort: 158 mutex_unlock(&data->update_lock); 159 return ret; 160 } 161 162 static int reg_to_rpm(u16 reg) 163 { 164 if (reg == 0) 165 return -EIO; 166 if (reg == 0xffff) 167 return 0; 168 169 return 5400540 / reg; 170 } 171 172 static ssize_t show_name(struct device *dev, struct device_attribute *devattr, 173 char *buf) 174 { 175 return snprintf(buf, PAGE_SIZE, "%s\n", DEVNAME); 176 } 177 178 static ssize_t show_in_value(struct device *dev, struct device_attribute 179 *devattr, char *buf) 180 { 181 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 182 struct sch5636_data *data = sch5636_update_device(dev); 183 int val; 184 185 if (IS_ERR(data)) 186 return PTR_ERR(data); 187 188 val = DIV_ROUND_CLOSEST( 189 data->in[attr->index] * SCH5636_REG_IN_FACTORS[attr->index], 190 255); 191 return snprintf(buf, PAGE_SIZE, "%d\n", val); 192 } 193 194 static ssize_t show_in_label(struct device *dev, struct device_attribute 195 *devattr, char *buf) 196 { 197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 198 199 return snprintf(buf, PAGE_SIZE, "%s\n", 200 SCH5636_IN_LABELS[attr->index]); 201 } 202 203 static ssize_t show_temp_value(struct device *dev, struct device_attribute 204 *devattr, char *buf) 205 { 206 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 207 struct sch5636_data *data = sch5636_update_device(dev); 208 int val; 209 210 if (IS_ERR(data)) 211 return PTR_ERR(data); 212 213 val = (data->temp_val[attr->index] - 64) * 1000; 214 return snprintf(buf, PAGE_SIZE, "%d\n", val); 215 } 216 217 static ssize_t show_temp_fault(struct device *dev, struct device_attribute 218 *devattr, char *buf) 219 { 220 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 221 struct sch5636_data *data = sch5636_update_device(dev); 222 int val; 223 224 if (IS_ERR(data)) 225 return PTR_ERR(data); 226 227 val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_WORKING) ? 0 : 1; 228 return snprintf(buf, PAGE_SIZE, "%d\n", val); 229 } 230 231 static ssize_t show_temp_alarm(struct device *dev, struct device_attribute 232 *devattr, char *buf) 233 { 234 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 235 struct sch5636_data *data = sch5636_update_device(dev); 236 int val; 237 238 if (IS_ERR(data)) 239 return PTR_ERR(data); 240 241 val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_ALARM) ? 1 : 0; 242 return snprintf(buf, PAGE_SIZE, "%d\n", val); 243 } 244 245 static ssize_t show_fan_value(struct device *dev, struct device_attribute 246 *devattr, char *buf) 247 { 248 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 249 struct sch5636_data *data = sch5636_update_device(dev); 250 int val; 251 252 if (IS_ERR(data)) 253 return PTR_ERR(data); 254 255 val = reg_to_rpm(data->fan_val[attr->index]); 256 if (val < 0) 257 return val; 258 259 return snprintf(buf, PAGE_SIZE, "%d\n", val); 260 } 261 262 static ssize_t show_fan_fault(struct device *dev, struct device_attribute 263 *devattr, char *buf) 264 { 265 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 266 struct sch5636_data *data = sch5636_update_device(dev); 267 int val; 268 269 if (IS_ERR(data)) 270 return PTR_ERR(data); 271 272 val = (data->fan_ctrl[attr->index] & SCH5636_FAN_NOT_PRESENT) ? 1 : 0; 273 return snprintf(buf, PAGE_SIZE, "%d\n", val); 274 } 275 276 static ssize_t show_fan_alarm(struct device *dev, struct device_attribute 277 *devattr, char *buf) 278 { 279 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 280 struct sch5636_data *data = sch5636_update_device(dev); 281 int val; 282 283 if (IS_ERR(data)) 284 return PTR_ERR(data); 285 286 val = (data->fan_ctrl[attr->index] & SCH5636_FAN_ALARM) ? 1 : 0; 287 return snprintf(buf, PAGE_SIZE, "%d\n", val); 288 } 289 290 static struct sensor_device_attribute sch5636_attr[] = { 291 SENSOR_ATTR(name, 0444, show_name, NULL, 0), 292 SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0), 293 SENSOR_ATTR(in0_label, 0444, show_in_label, NULL, 0), 294 SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1), 295 SENSOR_ATTR(in1_label, 0444, show_in_label, NULL, 1), 296 SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2), 297 SENSOR_ATTR(in2_label, 0444, show_in_label, NULL, 2), 298 SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3), 299 SENSOR_ATTR(in3_label, 0444, show_in_label, NULL, 3), 300 SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4), 301 SENSOR_ATTR(in4_label, 0444, show_in_label, NULL, 4), 302 }; 303 304 static struct sensor_device_attribute sch5636_temp_attr[] = { 305 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0), 306 SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0), 307 SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0), 308 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1), 309 SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1), 310 SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1), 311 SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2), 312 SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2), 313 SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2), 314 SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3), 315 SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3), 316 SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3), 317 SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4), 318 SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4), 319 SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4), 320 SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5), 321 SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5), 322 SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5), 323 SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6), 324 SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6), 325 SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6), 326 SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7), 327 SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7), 328 SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7), 329 SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8), 330 SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8), 331 SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8), 332 SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9), 333 SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9), 334 SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9), 335 SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10), 336 SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10), 337 SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10), 338 SENSOR_ATTR(temp12_input, 0444, show_temp_value, NULL, 11), 339 SENSOR_ATTR(temp12_fault, 0444, show_temp_fault, NULL, 11), 340 SENSOR_ATTR(temp12_alarm, 0444, show_temp_alarm, NULL, 11), 341 SENSOR_ATTR(temp13_input, 0444, show_temp_value, NULL, 12), 342 SENSOR_ATTR(temp13_fault, 0444, show_temp_fault, NULL, 12), 343 SENSOR_ATTR(temp13_alarm, 0444, show_temp_alarm, NULL, 12), 344 SENSOR_ATTR(temp14_input, 0444, show_temp_value, NULL, 13), 345 SENSOR_ATTR(temp14_fault, 0444, show_temp_fault, NULL, 13), 346 SENSOR_ATTR(temp14_alarm, 0444, show_temp_alarm, NULL, 13), 347 SENSOR_ATTR(temp15_input, 0444, show_temp_value, NULL, 14), 348 SENSOR_ATTR(temp15_fault, 0444, show_temp_fault, NULL, 14), 349 SENSOR_ATTR(temp15_alarm, 0444, show_temp_alarm, NULL, 14), 350 SENSOR_ATTR(temp16_input, 0444, show_temp_value, NULL, 15), 351 SENSOR_ATTR(temp16_fault, 0444, show_temp_fault, NULL, 15), 352 SENSOR_ATTR(temp16_alarm, 0444, show_temp_alarm, NULL, 15), 353 }; 354 355 static struct sensor_device_attribute sch5636_fan_attr[] = { 356 SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0), 357 SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0), 358 SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0), 359 SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1), 360 SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1), 361 SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1), 362 SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2), 363 SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2), 364 SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2), 365 SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3), 366 SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3), 367 SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3), 368 SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4), 369 SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4), 370 SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4), 371 SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5), 372 SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5), 373 SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5), 374 SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6), 375 SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6), 376 SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6), 377 SENSOR_ATTR(fan8_input, 0444, show_fan_value, NULL, 7), 378 SENSOR_ATTR(fan8_fault, 0444, show_fan_fault, NULL, 7), 379 SENSOR_ATTR(fan8_alarm, 0444, show_fan_alarm, NULL, 7), 380 }; 381 382 static int sch5636_remove(struct platform_device *pdev) 383 { 384 struct sch5636_data *data = platform_get_drvdata(pdev); 385 int i; 386 387 if (data->hwmon_dev) 388 hwmon_device_unregister(data->hwmon_dev); 389 390 for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++) 391 device_remove_file(&pdev->dev, &sch5636_attr[i].dev_attr); 392 393 for (i = 0; i < SCH5636_NO_TEMPS * 3; i++) 394 device_remove_file(&pdev->dev, 395 &sch5636_temp_attr[i].dev_attr); 396 397 for (i = 0; i < SCH5636_NO_FANS * 3; i++) 398 device_remove_file(&pdev->dev, 399 &sch5636_fan_attr[i].dev_attr); 400 401 platform_set_drvdata(pdev, NULL); 402 kfree(data); 403 404 return 0; 405 } 406 407 static int __devinit sch5636_probe(struct platform_device *pdev) 408 { 409 struct sch5636_data *data; 410 int i, err, val, revision[2]; 411 char id[4]; 412 413 data = kzalloc(sizeof(struct sch5636_data), GFP_KERNEL); 414 if (!data) 415 return -ENOMEM; 416 417 data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start; 418 mutex_init(&data->update_lock); 419 platform_set_drvdata(pdev, data); 420 421 for (i = 0; i < 3; i++) { 422 val = sch56xx_read_virtual_reg(data->addr, 423 SCH5636_REG_FUJITSU_ID + i); 424 if (val < 0) { 425 pr_err("Could not read Fujitsu id byte at %#x\n", 426 SCH5636_REG_FUJITSU_ID + i); 427 err = val; 428 goto error; 429 } 430 id[i] = val; 431 } 432 id[i] = '\0'; 433 434 if (strcmp(id, "THS")) { 435 pr_err("Unknown Fujitsu id: %02x%02x%02x\n", 436 id[0], id[1], id[2]); 437 err = -ENODEV; 438 goto error; 439 } 440 441 for (i = 0; i < 2; i++) { 442 val = sch56xx_read_virtual_reg(data->addr, 443 SCH5636_REG_FUJITSU_REV + i); 444 if (val < 0) { 445 err = val; 446 goto error; 447 } 448 revision[i] = val; 449 } 450 pr_info("Found %s chip at %#hx, revison: %d.%02d\n", DEVNAME, 451 data->addr, revision[0], revision[1]); 452 453 /* Read all temp + fan ctrl registers to determine which are active */ 454 for (i = 0; i < SCH5636_NO_TEMPS; i++) { 455 val = sch56xx_read_virtual_reg(data->addr, 456 SCH5636_REG_TEMP_CTRL(i)); 457 if (unlikely(val < 0)) { 458 err = val; 459 goto error; 460 } 461 data->temp_ctrl[i] = val; 462 } 463 464 for (i = 0; i < SCH5636_NO_FANS; i++) { 465 val = sch56xx_read_virtual_reg(data->addr, 466 SCH5636_REG_FAN_CTRL(i)); 467 if (unlikely(val < 0)) { 468 err = val; 469 goto error; 470 } 471 data->fan_ctrl[i] = val; 472 } 473 474 for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++) { 475 err = device_create_file(&pdev->dev, 476 &sch5636_attr[i].dev_attr); 477 if (err) 478 goto error; 479 } 480 481 for (i = 0; i < (SCH5636_NO_TEMPS * 3); i++) { 482 if (data->temp_ctrl[i/3] & SCH5636_TEMP_DEACTIVATED) 483 continue; 484 485 err = device_create_file(&pdev->dev, 486 &sch5636_temp_attr[i].dev_attr); 487 if (err) 488 goto error; 489 } 490 491 for (i = 0; i < (SCH5636_NO_FANS * 3); i++) { 492 if (data->fan_ctrl[i/3] & SCH5636_FAN_DEACTIVATED) 493 continue; 494 495 err = device_create_file(&pdev->dev, 496 &sch5636_fan_attr[i].dev_attr); 497 if (err) 498 goto error; 499 } 500 501 data->hwmon_dev = hwmon_device_register(&pdev->dev); 502 if (IS_ERR(data->hwmon_dev)) { 503 err = PTR_ERR(data->hwmon_dev); 504 data->hwmon_dev = NULL; 505 goto error; 506 } 507 508 return 0; 509 510 error: 511 sch5636_remove(pdev); 512 return err; 513 } 514 515 static struct platform_driver sch5636_driver = { 516 .driver = { 517 .owner = THIS_MODULE, 518 .name = DRVNAME, 519 }, 520 .probe = sch5636_probe, 521 .remove = sch5636_remove, 522 }; 523 524 static int __init sch5636_init(void) 525 { 526 return platform_driver_register(&sch5636_driver); 527 } 528 529 static void __exit sch5636_exit(void) 530 { 531 platform_driver_unregister(&sch5636_driver); 532 } 533 534 MODULE_DESCRIPTION("SMSC SCH5636 Hardware Monitoring Driver"); 535 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 536 MODULE_LICENSE("GPL"); 537 538 module_init(sch5636_init); 539 module_exit(sch5636_exit); 540