1 /* 2 * linux/drivers/mfd/ucb1x00-core.c 3 * 4 * Copyright (C) 2001 Russell King, All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License. 9 * 10 * The UCB1x00 core driver provides basic services for handling IO, 11 * the ADC, interrupts, and accessing registers. It is designed 12 * such that everything goes through this layer, thereby providing 13 * a consistent locking methodology, as well as allowing the drivers 14 * to be used on other non-MCP-enabled hardware platforms. 15 * 16 * Note that all locks are private to this file. Nothing else may 17 * touch them. 18 */ 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/slab.h> 22 #include <linux/init.h> 23 #include <linux/errno.h> 24 #include <linux/interrupt.h> 25 #include <linux/device.h> 26 #include <linux/mutex.h> 27 28 #include <asm/dma.h> 29 #include <asm/hardware.h> 30 31 #include "ucb1x00.h" 32 33 static DEFINE_MUTEX(ucb1x00_mutex); 34 static LIST_HEAD(ucb1x00_drivers); 35 static LIST_HEAD(ucb1x00_devices); 36 37 /** 38 * ucb1x00_io_set_dir - set IO direction 39 * @ucb: UCB1x00 structure describing chip 40 * @in: bitfield of IO pins to be set as inputs 41 * @out: bitfield of IO pins to be set as outputs 42 * 43 * Set the IO direction of the ten general purpose IO pins on 44 * the UCB1x00 chip. The @in bitfield has priority over the 45 * @out bitfield, in that if you specify a pin as both input 46 * and output, it will end up as an input. 47 * 48 * ucb1x00_enable must have been called to enable the comms 49 * before using this function. 50 * 51 * This function takes a spinlock, disabling interrupts. 52 */ 53 void ucb1x00_io_set_dir(struct ucb1x00 *ucb, unsigned int in, unsigned int out) 54 { 55 unsigned long flags; 56 57 spin_lock_irqsave(&ucb->io_lock, flags); 58 ucb->io_dir |= out; 59 ucb->io_dir &= ~in; 60 61 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 62 spin_unlock_irqrestore(&ucb->io_lock, flags); 63 } 64 65 /** 66 * ucb1x00_io_write - set or clear IO outputs 67 * @ucb: UCB1x00 structure describing chip 68 * @set: bitfield of IO pins to set to logic '1' 69 * @clear: bitfield of IO pins to set to logic '0' 70 * 71 * Set the IO output state of the specified IO pins. The value 72 * is retained if the pins are subsequently configured as inputs. 73 * The @clear bitfield has priority over the @set bitfield - 74 * outputs will be cleared. 75 * 76 * ucb1x00_enable must have been called to enable the comms 77 * before using this function. 78 * 79 * This function takes a spinlock, disabling interrupts. 80 */ 81 void ucb1x00_io_write(struct ucb1x00 *ucb, unsigned int set, unsigned int clear) 82 { 83 unsigned long flags; 84 85 spin_lock_irqsave(&ucb->io_lock, flags); 86 ucb->io_out |= set; 87 ucb->io_out &= ~clear; 88 89 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 90 spin_unlock_irqrestore(&ucb->io_lock, flags); 91 } 92 93 /** 94 * ucb1x00_io_read - read the current state of the IO pins 95 * @ucb: UCB1x00 structure describing chip 96 * 97 * Return a bitfield describing the logic state of the ten 98 * general purpose IO pins. 99 * 100 * ucb1x00_enable must have been called to enable the comms 101 * before using this function. 102 * 103 * This function does not take any semaphores or spinlocks. 104 */ 105 unsigned int ucb1x00_io_read(struct ucb1x00 *ucb) 106 { 107 return ucb1x00_reg_read(ucb, UCB_IO_DATA); 108 } 109 110 /* 111 * UCB1300 data sheet says we must: 112 * 1. enable ADC => 5us (including reference startup time) 113 * 2. select input => 51*tsibclk => 4.3us 114 * 3. start conversion => 102*tsibclk => 8.5us 115 * (tsibclk = 1/11981000) 116 * Period between SIB 128-bit frames = 10.7us 117 */ 118 119 /** 120 * ucb1x00_adc_enable - enable the ADC converter 121 * @ucb: UCB1x00 structure describing chip 122 * 123 * Enable the ucb1x00 and ADC converter on the UCB1x00 for use. 124 * Any code wishing to use the ADC converter must call this 125 * function prior to using it. 126 * 127 * This function takes the ADC semaphore to prevent two or more 128 * concurrent uses, and therefore may sleep. As a result, it 129 * can only be called from process context, not interrupt 130 * context. 131 * 132 * You should release the ADC as soon as possible using 133 * ucb1x00_adc_disable. 134 */ 135 void ucb1x00_adc_enable(struct ucb1x00 *ucb) 136 { 137 down(&ucb->adc_sem); 138 139 ucb->adc_cr |= UCB_ADC_ENA; 140 141 ucb1x00_enable(ucb); 142 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); 143 } 144 145 /** 146 * ucb1x00_adc_read - read the specified ADC channel 147 * @ucb: UCB1x00 structure describing chip 148 * @adc_channel: ADC channel mask 149 * @sync: wait for syncronisation pulse. 150 * 151 * Start an ADC conversion and wait for the result. Note that 152 * synchronised ADC conversions (via the ADCSYNC pin) must wait 153 * until the trigger is asserted and the conversion is finished. 154 * 155 * This function currently spins waiting for the conversion to 156 * complete (2 frames max without sync). 157 * 158 * If called for a synchronised ADC conversion, it may sleep 159 * with the ADC semaphore held. 160 */ 161 unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync) 162 { 163 unsigned int val; 164 165 if (sync) 166 adc_channel |= UCB_ADC_SYNC_ENA; 167 168 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel); 169 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel | UCB_ADC_START); 170 171 for (;;) { 172 val = ucb1x00_reg_read(ucb, UCB_ADC_DATA); 173 if (val & UCB_ADC_DAT_VAL) 174 break; 175 /* yield to other processes */ 176 set_current_state(TASK_INTERRUPTIBLE); 177 schedule_timeout(1); 178 } 179 180 return UCB_ADC_DAT(val); 181 } 182 183 /** 184 * ucb1x00_adc_disable - disable the ADC converter 185 * @ucb: UCB1x00 structure describing chip 186 * 187 * Disable the ADC converter and release the ADC semaphore. 188 */ 189 void ucb1x00_adc_disable(struct ucb1x00 *ucb) 190 { 191 ucb->adc_cr &= ~UCB_ADC_ENA; 192 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); 193 ucb1x00_disable(ucb); 194 195 up(&ucb->adc_sem); 196 } 197 198 /* 199 * UCB1x00 Interrupt handling. 200 * 201 * The UCB1x00 can generate interrupts when the SIBCLK is stopped. 202 * Since we need to read an internal register, we must re-enable 203 * SIBCLK to talk to the chip. We leave the clock running until 204 * we have finished processing all interrupts from the chip. 205 */ 206 static irqreturn_t ucb1x00_irq(int irqnr, void *devid, struct pt_regs *regs) 207 { 208 struct ucb1x00 *ucb = devid; 209 struct ucb1x00_irq *irq; 210 unsigned int isr, i; 211 212 ucb1x00_enable(ucb); 213 isr = ucb1x00_reg_read(ucb, UCB_IE_STATUS); 214 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr); 215 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 216 217 for (i = 0, irq = ucb->irq_handler; i < 16 && isr; i++, isr >>= 1, irq++) 218 if (isr & 1 && irq->fn) 219 irq->fn(i, irq->devid); 220 ucb1x00_disable(ucb); 221 222 return IRQ_HANDLED; 223 } 224 225 /** 226 * ucb1x00_hook_irq - hook a UCB1x00 interrupt 227 * @ucb: UCB1x00 structure describing chip 228 * @idx: interrupt index 229 * @fn: function to call when interrupt is triggered 230 * @devid: device id to pass to interrupt handler 231 * 232 * Hook the specified interrupt. You can only register one handler 233 * for each interrupt source. The interrupt source is not enabled 234 * by this function; use ucb1x00_enable_irq instead. 235 * 236 * Interrupt handlers will be called with other interrupts enabled. 237 * 238 * Returns zero on success, or one of the following errors: 239 * -EINVAL if the interrupt index is invalid 240 * -EBUSY if the interrupt has already been hooked 241 */ 242 int ucb1x00_hook_irq(struct ucb1x00 *ucb, unsigned int idx, void (*fn)(int, void *), void *devid) 243 { 244 struct ucb1x00_irq *irq; 245 int ret = -EINVAL; 246 247 if (idx < 16) { 248 irq = ucb->irq_handler + idx; 249 ret = -EBUSY; 250 251 spin_lock_irq(&ucb->lock); 252 if (irq->fn == NULL) { 253 irq->devid = devid; 254 irq->fn = fn; 255 ret = 0; 256 } 257 spin_unlock_irq(&ucb->lock); 258 } 259 return ret; 260 } 261 262 /** 263 * ucb1x00_enable_irq - enable an UCB1x00 interrupt source 264 * @ucb: UCB1x00 structure describing chip 265 * @idx: interrupt index 266 * @edges: interrupt edges to enable 267 * 268 * Enable the specified interrupt to trigger on %UCB_RISING, 269 * %UCB_FALLING or both edges. The interrupt should have been 270 * hooked by ucb1x00_hook_irq. 271 */ 272 void ucb1x00_enable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) 273 { 274 unsigned long flags; 275 276 if (idx < 16) { 277 spin_lock_irqsave(&ucb->lock, flags); 278 279 ucb1x00_enable(ucb); 280 if (edges & UCB_RISING) { 281 ucb->irq_ris_enbl |= 1 << idx; 282 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 283 } 284 if (edges & UCB_FALLING) { 285 ucb->irq_fal_enbl |= 1 << idx; 286 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 287 } 288 ucb1x00_disable(ucb); 289 spin_unlock_irqrestore(&ucb->lock, flags); 290 } 291 } 292 293 /** 294 * ucb1x00_disable_irq - disable an UCB1x00 interrupt source 295 * @ucb: UCB1x00 structure describing chip 296 * @edges: interrupt edges to disable 297 * 298 * Disable the specified interrupt triggering on the specified 299 * (%UCB_RISING, %UCB_FALLING or both) edges. 300 */ 301 void ucb1x00_disable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) 302 { 303 unsigned long flags; 304 305 if (idx < 16) { 306 spin_lock_irqsave(&ucb->lock, flags); 307 308 ucb1x00_enable(ucb); 309 if (edges & UCB_RISING) { 310 ucb->irq_ris_enbl &= ~(1 << idx); 311 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 312 } 313 if (edges & UCB_FALLING) { 314 ucb->irq_fal_enbl &= ~(1 << idx); 315 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 316 } 317 ucb1x00_disable(ucb); 318 spin_unlock_irqrestore(&ucb->lock, flags); 319 } 320 } 321 322 /** 323 * ucb1x00_free_irq - disable and free the specified UCB1x00 interrupt 324 * @ucb: UCB1x00 structure describing chip 325 * @idx: interrupt index 326 * @devid: device id. 327 * 328 * Disable the interrupt source and remove the handler. devid must 329 * match the devid passed when hooking the interrupt. 330 * 331 * Returns zero on success, or one of the following errors: 332 * -EINVAL if the interrupt index is invalid 333 * -ENOENT if devid does not match 334 */ 335 int ucb1x00_free_irq(struct ucb1x00 *ucb, unsigned int idx, void *devid) 336 { 337 struct ucb1x00_irq *irq; 338 int ret; 339 340 if (idx >= 16) 341 goto bad; 342 343 irq = ucb->irq_handler + idx; 344 ret = -ENOENT; 345 346 spin_lock_irq(&ucb->lock); 347 if (irq->devid == devid) { 348 ucb->irq_ris_enbl &= ~(1 << idx); 349 ucb->irq_fal_enbl &= ~(1 << idx); 350 351 ucb1x00_enable(ucb); 352 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 353 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 354 ucb1x00_disable(ucb); 355 356 irq->fn = NULL; 357 irq->devid = NULL; 358 ret = 0; 359 } 360 spin_unlock_irq(&ucb->lock); 361 return ret; 362 363 bad: 364 printk(KERN_ERR "Freeing bad UCB1x00 irq %d\n", idx); 365 return -EINVAL; 366 } 367 368 static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv) 369 { 370 struct ucb1x00_dev *dev; 371 int ret = -ENOMEM; 372 373 dev = kmalloc(sizeof(struct ucb1x00_dev), GFP_KERNEL); 374 if (dev) { 375 dev->ucb = ucb; 376 dev->drv = drv; 377 378 ret = drv->add(dev); 379 380 if (ret == 0) { 381 list_add(&dev->dev_node, &ucb->devs); 382 list_add(&dev->drv_node, &drv->devs); 383 } else { 384 kfree(dev); 385 } 386 } 387 return ret; 388 } 389 390 static void ucb1x00_remove_dev(struct ucb1x00_dev *dev) 391 { 392 dev->drv->remove(dev); 393 list_del(&dev->dev_node); 394 list_del(&dev->drv_node); 395 kfree(dev); 396 } 397 398 /* 399 * Try to probe our interrupt, rather than relying on lots of 400 * hard-coded machine dependencies. For reference, the expected 401 * IRQ mappings are: 402 * 403 * Machine Default IRQ 404 * adsbitsy IRQ_GPCIN4 405 * cerf IRQ_GPIO_UCB1200_IRQ 406 * flexanet IRQ_GPIO_GUI 407 * freebird IRQ_GPIO_FREEBIRD_UCB1300_IRQ 408 * graphicsclient ADS_EXT_IRQ(8) 409 * graphicsmaster ADS_EXT_IRQ(8) 410 * lart LART_IRQ_UCB1200 411 * omnimeter IRQ_GPIO23 412 * pfs168 IRQ_GPIO_UCB1300_IRQ 413 * simpad IRQ_GPIO_UCB1300_IRQ 414 * shannon SHANNON_IRQ_GPIO_IRQ_CODEC 415 * yopy IRQ_GPIO_UCB1200_IRQ 416 */ 417 static int ucb1x00_detect_irq(struct ucb1x00 *ucb) 418 { 419 unsigned long mask; 420 421 mask = probe_irq_on(); 422 if (!mask) { 423 probe_irq_off(mask); 424 return NO_IRQ; 425 } 426 427 /* 428 * Enable the ADC interrupt. 429 */ 430 ucb1x00_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC); 431 ucb1x00_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC); 432 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); 433 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 434 435 /* 436 * Cause an ADC interrupt. 437 */ 438 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA); 439 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START); 440 441 /* 442 * Wait for the conversion to complete. 443 */ 444 while ((ucb1x00_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VAL) == 0); 445 ucb1x00_reg_write(ucb, UCB_ADC_CR, 0); 446 447 /* 448 * Disable and clear interrupt. 449 */ 450 ucb1x00_reg_write(ucb, UCB_IE_RIS, 0); 451 ucb1x00_reg_write(ucb, UCB_IE_FAL, 0); 452 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); 453 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 454 455 /* 456 * Read triggered interrupt. 457 */ 458 return probe_irq_off(mask); 459 } 460 461 static void ucb1x00_release(struct class_device *dev) 462 { 463 struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); 464 kfree(ucb); 465 } 466 467 static struct class ucb1x00_class = { 468 .name = "ucb1x00", 469 .release = ucb1x00_release, 470 }; 471 472 static int ucb1x00_probe(struct mcp *mcp) 473 { 474 struct ucb1x00 *ucb; 475 struct ucb1x00_driver *drv; 476 unsigned int id; 477 int ret = -ENODEV; 478 479 mcp_enable(mcp); 480 id = mcp_reg_read(mcp, UCB_ID); 481 482 if (id != UCB_ID_1200 && id != UCB_ID_1300) { 483 printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id); 484 goto err_disable; 485 } 486 487 ucb = kmalloc(sizeof(struct ucb1x00), GFP_KERNEL); 488 ret = -ENOMEM; 489 if (!ucb) 490 goto err_disable; 491 492 memset(ucb, 0, sizeof(struct ucb1x00)); 493 494 ucb->cdev.class = &ucb1x00_class; 495 ucb->cdev.dev = &mcp->attached_device; 496 strlcpy(ucb->cdev.class_id, "ucb1x00", sizeof(ucb->cdev.class_id)); 497 498 spin_lock_init(&ucb->lock); 499 spin_lock_init(&ucb->io_lock); 500 sema_init(&ucb->adc_sem, 1); 501 502 ucb->id = id; 503 ucb->mcp = mcp; 504 ucb->irq = ucb1x00_detect_irq(ucb); 505 if (ucb->irq == NO_IRQ) { 506 printk(KERN_ERR "UCB1x00: IRQ probe failed\n"); 507 ret = -ENODEV; 508 goto err_free; 509 } 510 511 ret = request_irq(ucb->irq, ucb1x00_irq, IRQF_TRIGGER_RISING, 512 "UCB1x00", ucb); 513 if (ret) { 514 printk(KERN_ERR "ucb1x00: unable to grab irq%d: %d\n", 515 ucb->irq, ret); 516 goto err_free; 517 } 518 519 mcp_set_drvdata(mcp, ucb); 520 521 ret = class_device_register(&ucb->cdev); 522 if (ret) 523 goto err_irq; 524 525 INIT_LIST_HEAD(&ucb->devs); 526 mutex_lock(&ucb1x00_mutex); 527 list_add(&ucb->node, &ucb1x00_devices); 528 list_for_each_entry(drv, &ucb1x00_drivers, node) { 529 ucb1x00_add_dev(ucb, drv); 530 } 531 mutex_unlock(&ucb1x00_mutex); 532 goto out; 533 534 err_irq: 535 free_irq(ucb->irq, ucb); 536 err_free: 537 kfree(ucb); 538 err_disable: 539 mcp_disable(mcp); 540 out: 541 return ret; 542 } 543 544 static void ucb1x00_remove(struct mcp *mcp) 545 { 546 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 547 struct list_head *l, *n; 548 549 mutex_lock(&ucb1x00_mutex); 550 list_del(&ucb->node); 551 list_for_each_safe(l, n, &ucb->devs) { 552 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, dev_node); 553 ucb1x00_remove_dev(dev); 554 } 555 mutex_unlock(&ucb1x00_mutex); 556 557 free_irq(ucb->irq, ucb); 558 class_device_unregister(&ucb->cdev); 559 } 560 561 int ucb1x00_register_driver(struct ucb1x00_driver *drv) 562 { 563 struct ucb1x00 *ucb; 564 565 INIT_LIST_HEAD(&drv->devs); 566 mutex_lock(&ucb1x00_mutex); 567 list_add(&drv->node, &ucb1x00_drivers); 568 list_for_each_entry(ucb, &ucb1x00_devices, node) { 569 ucb1x00_add_dev(ucb, drv); 570 } 571 mutex_unlock(&ucb1x00_mutex); 572 return 0; 573 } 574 575 void ucb1x00_unregister_driver(struct ucb1x00_driver *drv) 576 { 577 struct list_head *n, *l; 578 579 mutex_lock(&ucb1x00_mutex); 580 list_del(&drv->node); 581 list_for_each_safe(l, n, &drv->devs) { 582 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, drv_node); 583 ucb1x00_remove_dev(dev); 584 } 585 mutex_unlock(&ucb1x00_mutex); 586 } 587 588 static int ucb1x00_suspend(struct mcp *mcp, pm_message_t state) 589 { 590 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 591 struct ucb1x00_dev *dev; 592 593 mutex_lock(&ucb1x00_mutex); 594 list_for_each_entry(dev, &ucb->devs, dev_node) { 595 if (dev->drv->suspend) 596 dev->drv->suspend(dev, state); 597 } 598 mutex_unlock(&ucb1x00_mutex); 599 return 0; 600 } 601 602 static int ucb1x00_resume(struct mcp *mcp) 603 { 604 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 605 struct ucb1x00_dev *dev; 606 607 mutex_lock(&ucb1x00_mutex); 608 list_for_each_entry(dev, &ucb->devs, dev_node) { 609 if (dev->drv->resume) 610 dev->drv->resume(dev); 611 } 612 mutex_unlock(&ucb1x00_mutex); 613 return 0; 614 } 615 616 static struct mcp_driver ucb1x00_driver = { 617 .drv = { 618 .name = "ucb1x00", 619 }, 620 .probe = ucb1x00_probe, 621 .remove = ucb1x00_remove, 622 .suspend = ucb1x00_suspend, 623 .resume = ucb1x00_resume, 624 }; 625 626 static int __init ucb1x00_init(void) 627 { 628 int ret = class_register(&ucb1x00_class); 629 if (ret == 0) { 630 ret = mcp_driver_register(&ucb1x00_driver); 631 if (ret) 632 class_unregister(&ucb1x00_class); 633 } 634 return ret; 635 } 636 637 static void __exit ucb1x00_exit(void) 638 { 639 mcp_driver_unregister(&ucb1x00_driver); 640 class_unregister(&ucb1x00_class); 641 } 642 643 module_init(ucb1x00_init); 644 module_exit(ucb1x00_exit); 645 646 EXPORT_SYMBOL(ucb1x00_io_set_dir); 647 EXPORT_SYMBOL(ucb1x00_io_write); 648 EXPORT_SYMBOL(ucb1x00_io_read); 649 650 EXPORT_SYMBOL(ucb1x00_adc_enable); 651 EXPORT_SYMBOL(ucb1x00_adc_read); 652 EXPORT_SYMBOL(ucb1x00_adc_disable); 653 654 EXPORT_SYMBOL(ucb1x00_hook_irq); 655 EXPORT_SYMBOL(ucb1x00_free_irq); 656 EXPORT_SYMBOL(ucb1x00_enable_irq); 657 EXPORT_SYMBOL(ucb1x00_disable_irq); 658 659 EXPORT_SYMBOL(ucb1x00_register_driver); 660 EXPORT_SYMBOL(ucb1x00_unregister_driver); 661 662 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 663 MODULE_DESCRIPTION("UCB1x00 core driver"); 664 MODULE_LICENSE("GPL"); 665