ucb1x00-core.c revision f5ae587f5d258bda9c24bb8387315eb2ebedeee9
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/sched.h> 22#include <linux/slab.h> 23#include <linux/init.h> 24#include <linux/errno.h> 25#include <linux/interrupt.h> 26#include <linux/device.h> 27#include <linux/mutex.h> 28#include <linux/mfd/ucb1x00.h> 29#include <linux/gpio.h> 30 31static DEFINE_MUTEX(ucb1x00_mutex); 32static LIST_HEAD(ucb1x00_drivers); 33static LIST_HEAD(ucb1x00_devices); 34 35/** 36 * ucb1x00_io_set_dir - set IO direction 37 * @ucb: UCB1x00 structure describing chip 38 * @in: bitfield of IO pins to be set as inputs 39 * @out: bitfield of IO pins to be set as outputs 40 * 41 * Set the IO direction of the ten general purpose IO pins on 42 * the UCB1x00 chip. The @in bitfield has priority over the 43 * @out bitfield, in that if you specify a pin as both input 44 * and output, it will end up as an input. 45 * 46 * ucb1x00_enable must have been called to enable the comms 47 * before using this function. 48 * 49 * This function takes a spinlock, disabling interrupts. 50 */ 51void ucb1x00_io_set_dir(struct ucb1x00 *ucb, unsigned int in, unsigned int out) 52{ 53 unsigned long flags; 54 55 spin_lock_irqsave(&ucb->io_lock, flags); 56 ucb->io_dir |= out; 57 ucb->io_dir &= ~in; 58 59 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 60 spin_unlock_irqrestore(&ucb->io_lock, flags); 61} 62 63/** 64 * ucb1x00_io_write - set or clear IO outputs 65 * @ucb: UCB1x00 structure describing chip 66 * @set: bitfield of IO pins to set to logic '1' 67 * @clear: bitfield of IO pins to set to logic '0' 68 * 69 * Set the IO output state of the specified IO pins. The value 70 * is retained if the pins are subsequently configured as inputs. 71 * The @clear bitfield has priority over the @set bitfield - 72 * outputs will be cleared. 73 * 74 * ucb1x00_enable must have been called to enable the comms 75 * before using this function. 76 * 77 * This function takes a spinlock, disabling interrupts. 78 */ 79void ucb1x00_io_write(struct ucb1x00 *ucb, unsigned int set, unsigned int clear) 80{ 81 unsigned long flags; 82 83 spin_lock_irqsave(&ucb->io_lock, flags); 84 ucb->io_out |= set; 85 ucb->io_out &= ~clear; 86 87 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 88 spin_unlock_irqrestore(&ucb->io_lock, flags); 89} 90 91/** 92 * ucb1x00_io_read - read the current state of the IO pins 93 * @ucb: UCB1x00 structure describing chip 94 * 95 * Return a bitfield describing the logic state of the ten 96 * general purpose IO pins. 97 * 98 * ucb1x00_enable must have been called to enable the comms 99 * before using this function. 100 * 101 * This function does not take any mutexes or spinlocks. 102 */ 103unsigned int ucb1x00_io_read(struct ucb1x00 *ucb) 104{ 105 return ucb1x00_reg_read(ucb, UCB_IO_DATA); 106} 107 108static void ucb1x00_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 109{ 110 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 111 unsigned long flags; 112 113 spin_lock_irqsave(&ucb->io_lock, flags); 114 if (value) 115 ucb->io_out |= 1 << offset; 116 else 117 ucb->io_out &= ~(1 << offset); 118 119 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 120 spin_unlock_irqrestore(&ucb->io_lock, flags); 121} 122 123static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset) 124{ 125 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 126 return ucb1x00_reg_read(ucb, UCB_IO_DATA) & (1 << offset); 127} 128 129static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 130{ 131 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 132 unsigned long flags; 133 134 spin_lock_irqsave(&ucb->io_lock, flags); 135 ucb->io_dir &= ~(1 << offset); 136 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 137 spin_unlock_irqrestore(&ucb->io_lock, flags); 138 139 return 0; 140} 141 142static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset 143 , int value) 144{ 145 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 146 unsigned long flags; 147 unsigned old, mask = 1 << offset; 148 149 spin_lock_irqsave(&ucb->io_lock, flags); 150 old = ucb->io_out; 151 if (value) 152 ucb->io_out |= mask; 153 else 154 ucb->io_out &= ~mask; 155 156 if (old != ucb->io_out) 157 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 158 159 if (!(ucb->io_dir & mask)) { 160 ucb->io_dir |= mask; 161 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 162 } 163 spin_unlock_irqrestore(&ucb->io_lock, flags); 164 165 return 0; 166} 167 168/* 169 * UCB1300 data sheet says we must: 170 * 1. enable ADC => 5us (including reference startup time) 171 * 2. select input => 51*tsibclk => 4.3us 172 * 3. start conversion => 102*tsibclk => 8.5us 173 * (tsibclk = 1/11981000) 174 * Period between SIB 128-bit frames = 10.7us 175 */ 176 177/** 178 * ucb1x00_adc_enable - enable the ADC converter 179 * @ucb: UCB1x00 structure describing chip 180 * 181 * Enable the ucb1x00 and ADC converter on the UCB1x00 for use. 182 * Any code wishing to use the ADC converter must call this 183 * function prior to using it. 184 * 185 * This function takes the ADC mutex to prevent two or more 186 * concurrent uses, and therefore may sleep. As a result, it 187 * can only be called from process context, not interrupt 188 * context. 189 * 190 * You should release the ADC as soon as possible using 191 * ucb1x00_adc_disable. 192 */ 193void ucb1x00_adc_enable(struct ucb1x00 *ucb) 194{ 195 mutex_lock(&ucb->adc_mutex); 196 197 ucb->adc_cr |= UCB_ADC_ENA; 198 199 ucb1x00_enable(ucb); 200 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); 201} 202 203/** 204 * ucb1x00_adc_read - read the specified ADC channel 205 * @ucb: UCB1x00 structure describing chip 206 * @adc_channel: ADC channel mask 207 * @sync: wait for syncronisation pulse. 208 * 209 * Start an ADC conversion and wait for the result. Note that 210 * synchronised ADC conversions (via the ADCSYNC pin) must wait 211 * until the trigger is asserted and the conversion is finished. 212 * 213 * This function currently spins waiting for the conversion to 214 * complete (2 frames max without sync). 215 * 216 * If called for a synchronised ADC conversion, it may sleep 217 * with the ADC mutex held. 218 */ 219unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync) 220{ 221 unsigned int val; 222 223 if (sync) 224 adc_channel |= UCB_ADC_SYNC_ENA; 225 226 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel); 227 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel | UCB_ADC_START); 228 229 for (;;) { 230 val = ucb1x00_reg_read(ucb, UCB_ADC_DATA); 231 if (val & UCB_ADC_DAT_VAL) 232 break; 233 /* yield to other processes */ 234 set_current_state(TASK_INTERRUPTIBLE); 235 schedule_timeout(1); 236 } 237 238 return UCB_ADC_DAT(val); 239} 240 241/** 242 * ucb1x00_adc_disable - disable the ADC converter 243 * @ucb: UCB1x00 structure describing chip 244 * 245 * Disable the ADC converter and release the ADC mutex. 246 */ 247void ucb1x00_adc_disable(struct ucb1x00 *ucb) 248{ 249 ucb->adc_cr &= ~UCB_ADC_ENA; 250 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); 251 ucb1x00_disable(ucb); 252 253 mutex_unlock(&ucb->adc_mutex); 254} 255 256/* 257 * UCB1x00 Interrupt handling. 258 * 259 * The UCB1x00 can generate interrupts when the SIBCLK is stopped. 260 * Since we need to read an internal register, we must re-enable 261 * SIBCLK to talk to the chip. We leave the clock running until 262 * we have finished processing all interrupts from the chip. 263 */ 264static irqreturn_t ucb1x00_irq(int irqnr, void *devid) 265{ 266 struct ucb1x00 *ucb = devid; 267 struct ucb1x00_irq *irq; 268 unsigned int isr, i; 269 270 ucb1x00_enable(ucb); 271 isr = ucb1x00_reg_read(ucb, UCB_IE_STATUS); 272 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr); 273 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 274 275 for (i = 0, irq = ucb->irq_handler; i < 16 && isr; i++, isr >>= 1, irq++) 276 if (isr & 1 && irq->fn) 277 irq->fn(i, irq->devid); 278 ucb1x00_disable(ucb); 279 280 return IRQ_HANDLED; 281} 282 283/** 284 * ucb1x00_hook_irq - hook a UCB1x00 interrupt 285 * @ucb: UCB1x00 structure describing chip 286 * @idx: interrupt index 287 * @fn: function to call when interrupt is triggered 288 * @devid: device id to pass to interrupt handler 289 * 290 * Hook the specified interrupt. You can only register one handler 291 * for each interrupt source. The interrupt source is not enabled 292 * by this function; use ucb1x00_enable_irq instead. 293 * 294 * Interrupt handlers will be called with other interrupts enabled. 295 * 296 * Returns zero on success, or one of the following errors: 297 * -EINVAL if the interrupt index is invalid 298 * -EBUSY if the interrupt has already been hooked 299 */ 300int ucb1x00_hook_irq(struct ucb1x00 *ucb, unsigned int idx, void (*fn)(int, void *), void *devid) 301{ 302 struct ucb1x00_irq *irq; 303 int ret = -EINVAL; 304 305 if (idx < 16) { 306 irq = ucb->irq_handler + idx; 307 ret = -EBUSY; 308 309 spin_lock_irq(&ucb->lock); 310 if (irq->fn == NULL) { 311 irq->devid = devid; 312 irq->fn = fn; 313 ret = 0; 314 } 315 spin_unlock_irq(&ucb->lock); 316 } 317 return ret; 318} 319 320/** 321 * ucb1x00_enable_irq - enable an UCB1x00 interrupt source 322 * @ucb: UCB1x00 structure describing chip 323 * @idx: interrupt index 324 * @edges: interrupt edges to enable 325 * 326 * Enable the specified interrupt to trigger on %UCB_RISING, 327 * %UCB_FALLING or both edges. The interrupt should have been 328 * hooked by ucb1x00_hook_irq. 329 */ 330void ucb1x00_enable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) 331{ 332 unsigned long flags; 333 334 if (idx < 16) { 335 spin_lock_irqsave(&ucb->lock, flags); 336 337 ucb1x00_enable(ucb); 338 if (edges & UCB_RISING) { 339 ucb->irq_ris_enbl |= 1 << idx; 340 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 341 } 342 if (edges & UCB_FALLING) { 343 ucb->irq_fal_enbl |= 1 << idx; 344 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 345 } 346 ucb1x00_disable(ucb); 347 spin_unlock_irqrestore(&ucb->lock, flags); 348 } 349} 350 351/** 352 * ucb1x00_disable_irq - disable an UCB1x00 interrupt source 353 * @ucb: UCB1x00 structure describing chip 354 * @edges: interrupt edges to disable 355 * 356 * Disable the specified interrupt triggering on the specified 357 * (%UCB_RISING, %UCB_FALLING or both) edges. 358 */ 359void ucb1x00_disable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) 360{ 361 unsigned long flags; 362 363 if (idx < 16) { 364 spin_lock_irqsave(&ucb->lock, flags); 365 366 ucb1x00_enable(ucb); 367 if (edges & UCB_RISING) { 368 ucb->irq_ris_enbl &= ~(1 << idx); 369 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 370 } 371 if (edges & UCB_FALLING) { 372 ucb->irq_fal_enbl &= ~(1 << idx); 373 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 374 } 375 ucb1x00_disable(ucb); 376 spin_unlock_irqrestore(&ucb->lock, flags); 377 } 378} 379 380/** 381 * ucb1x00_free_irq - disable and free the specified UCB1x00 interrupt 382 * @ucb: UCB1x00 structure describing chip 383 * @idx: interrupt index 384 * @devid: device id. 385 * 386 * Disable the interrupt source and remove the handler. devid must 387 * match the devid passed when hooking the interrupt. 388 * 389 * Returns zero on success, or one of the following errors: 390 * -EINVAL if the interrupt index is invalid 391 * -ENOENT if devid does not match 392 */ 393int ucb1x00_free_irq(struct ucb1x00 *ucb, unsigned int idx, void *devid) 394{ 395 struct ucb1x00_irq *irq; 396 int ret; 397 398 if (idx >= 16) 399 goto bad; 400 401 irq = ucb->irq_handler + idx; 402 ret = -ENOENT; 403 404 spin_lock_irq(&ucb->lock); 405 if (irq->devid == devid) { 406 ucb->irq_ris_enbl &= ~(1 << idx); 407 ucb->irq_fal_enbl &= ~(1 << idx); 408 409 ucb1x00_enable(ucb); 410 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 411 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 412 ucb1x00_disable(ucb); 413 414 irq->fn = NULL; 415 irq->devid = NULL; 416 ret = 0; 417 } 418 spin_unlock_irq(&ucb->lock); 419 return ret; 420 421bad: 422 printk(KERN_ERR "Freeing bad UCB1x00 irq %d\n", idx); 423 return -EINVAL; 424} 425 426static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv) 427{ 428 struct ucb1x00_dev *dev; 429 int ret = -ENOMEM; 430 431 dev = kmalloc(sizeof(struct ucb1x00_dev), GFP_KERNEL); 432 if (dev) { 433 dev->ucb = ucb; 434 dev->drv = drv; 435 436 ret = drv->add(dev); 437 438 if (ret == 0) { 439 list_add(&dev->dev_node, &ucb->devs); 440 list_add(&dev->drv_node, &drv->devs); 441 } else { 442 kfree(dev); 443 } 444 } 445 return ret; 446} 447 448static void ucb1x00_remove_dev(struct ucb1x00_dev *dev) 449{ 450 dev->drv->remove(dev); 451 list_del(&dev->dev_node); 452 list_del(&dev->drv_node); 453 kfree(dev); 454} 455 456/* 457 * Try to probe our interrupt, rather than relying on lots of 458 * hard-coded machine dependencies. For reference, the expected 459 * IRQ mappings are: 460 * 461 * Machine Default IRQ 462 * adsbitsy IRQ_GPCIN4 463 * cerf IRQ_GPIO_UCB1200_IRQ 464 * flexanet IRQ_GPIO_GUI 465 * freebird IRQ_GPIO_FREEBIRD_UCB1300_IRQ 466 * graphicsclient ADS_EXT_IRQ(8) 467 * graphicsmaster ADS_EXT_IRQ(8) 468 * lart LART_IRQ_UCB1200 469 * omnimeter IRQ_GPIO23 470 * pfs168 IRQ_GPIO_UCB1300_IRQ 471 * simpad IRQ_GPIO_UCB1300_IRQ 472 * shannon SHANNON_IRQ_GPIO_IRQ_CODEC 473 * yopy IRQ_GPIO_UCB1200_IRQ 474 */ 475static int ucb1x00_detect_irq(struct ucb1x00 *ucb) 476{ 477 unsigned long mask; 478 479 mask = probe_irq_on(); 480 if (!mask) { 481 probe_irq_off(mask); 482 return NO_IRQ; 483 } 484 485 /* 486 * Enable the ADC interrupt. 487 */ 488 ucb1x00_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC); 489 ucb1x00_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC); 490 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); 491 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 492 493 /* 494 * Cause an ADC interrupt. 495 */ 496 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA); 497 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START); 498 499 /* 500 * Wait for the conversion to complete. 501 */ 502 while ((ucb1x00_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VAL) == 0); 503 ucb1x00_reg_write(ucb, UCB_ADC_CR, 0); 504 505 /* 506 * Disable and clear interrupt. 507 */ 508 ucb1x00_reg_write(ucb, UCB_IE_RIS, 0); 509 ucb1x00_reg_write(ucb, UCB_IE_FAL, 0); 510 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); 511 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 512 513 /* 514 * Read triggered interrupt. 515 */ 516 return probe_irq_off(mask); 517} 518 519static void ucb1x00_release(struct device *dev) 520{ 521 struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); 522 kfree(ucb); 523} 524 525static struct class ucb1x00_class = { 526 .name = "ucb1x00", 527 .dev_release = ucb1x00_release, 528}; 529 530static int ucb1x00_probe(struct mcp *mcp) 531{ 532 struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data; 533 struct ucb1x00_driver *drv; 534 struct ucb1x00 *ucb; 535 unsigned int id; 536 int ret = -ENODEV; 537 int temp; 538 539 /* Tell the platform to deassert the UCB1x00 reset */ 540 if (pdata && pdata->reset) 541 pdata->reset(UCB_RST_PROBE); 542 543 mcp_enable(mcp); 544 id = mcp_reg_read(mcp, UCB_ID); 545 546 if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143) { 547 printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id); 548 goto err_disable; 549 } 550 551 ucb = kzalloc(sizeof(struct ucb1x00), GFP_KERNEL); 552 ret = -ENOMEM; 553 if (!ucb) 554 goto err_disable; 555 556 device_initialize(&ucb->dev); 557 ucb->dev.class = &ucb1x00_class; 558 ucb->dev.parent = &mcp->attached_device; 559 dev_set_name(&ucb->dev, "ucb1x00"); 560 561 spin_lock_init(&ucb->lock); 562 spin_lock_init(&ucb->io_lock); 563 mutex_init(&ucb->adc_mutex); 564 565 ucb->id = id; 566 ucb->mcp = mcp; 567 568 ret = device_add(&ucb->dev); 569 if (ret) 570 goto err_dev_add; 571 572 ucb->irq = ucb1x00_detect_irq(ucb); 573 if (ucb->irq == NO_IRQ) { 574 dev_err(&ucb->dev, "IRQ probe failed\n"); 575 ret = -ENODEV; 576 goto err_no_irq; 577 } 578 579 ucb->gpio.base = -1; 580 if (pdata && pdata->gpio_base) { 581 ucb->gpio.label = dev_name(&ucb->dev); 582 ucb->gpio.base = pdata->gpio_base; 583 ucb->gpio.ngpio = 10; 584 ucb->gpio.set = ucb1x00_gpio_set; 585 ucb->gpio.get = ucb1x00_gpio_get; 586 ucb->gpio.direction_input = ucb1x00_gpio_direction_input; 587 ucb->gpio.direction_output = ucb1x00_gpio_direction_output; 588 ret = gpiochip_add(&ucb->gpio); 589 if (ret) 590 goto err_gpio_add; 591 } else 592 dev_info(&ucb->dev, "gpio_base not set so no gpiolib support"); 593 594 ret = request_irq(ucb->irq, ucb1x00_irq, IRQF_TRIGGER_RISING, 595 "UCB1x00", ucb); 596 if (ret) { 597 dev_err(&ucb->dev, "ucb1x00: unable to grab irq%d: %d\n", 598 ucb->irq, ret); 599 goto err_irq; 600 } 601 602 mcp_set_drvdata(mcp, ucb); 603 604 INIT_LIST_HEAD(&ucb->devs); 605 mutex_lock(&ucb1x00_mutex); 606 list_add(&ucb->node, &ucb1x00_devices); 607 list_for_each_entry(drv, &ucb1x00_drivers, node) { 608 ucb1x00_add_dev(ucb, drv); 609 } 610 mutex_unlock(&ucb1x00_mutex); 611 612 return ret; 613 614 err_irq: 615 if (ucb->gpio.base != -1) 616 temp = gpiochip_remove(&ucb->gpio); 617 err_gpio_add: 618 err_no_irq: 619 device_del(&ucb->dev); 620 err_dev_add: 621 put_device(&ucb->dev); 622 err_disable: 623 mcp_disable(mcp); 624 out: 625 if (pdata && pdata->reset) 626 pdata->reset(UCB_RST_PROBE_FAIL); 627 return ret; 628} 629 630static void ucb1x00_remove(struct mcp *mcp) 631{ 632 struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data; 633 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 634 struct list_head *l, *n; 635 int ret; 636 637 mutex_lock(&ucb1x00_mutex); 638 list_del(&ucb->node); 639 list_for_each_safe(l, n, &ucb->devs) { 640 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, dev_node); 641 ucb1x00_remove_dev(dev); 642 } 643 mutex_unlock(&ucb1x00_mutex); 644 645 if (ucb->gpio.base != -1) { 646 ret = gpiochip_remove(&ucb->gpio); 647 if (ret) 648 dev_err(&ucb->dev, "Can't remove gpio chip: %d\n", ret); 649 } 650 651 free_irq(ucb->irq, ucb); 652 device_unregister(&ucb->dev); 653 654 if (pdata && pdata->reset) 655 pdata->reset(UCB_RST_REMOVE); 656} 657 658int ucb1x00_register_driver(struct ucb1x00_driver *drv) 659{ 660 struct ucb1x00 *ucb; 661 662 INIT_LIST_HEAD(&drv->devs); 663 mutex_lock(&ucb1x00_mutex); 664 list_add(&drv->node, &ucb1x00_drivers); 665 list_for_each_entry(ucb, &ucb1x00_devices, node) { 666 ucb1x00_add_dev(ucb, drv); 667 } 668 mutex_unlock(&ucb1x00_mutex); 669 return 0; 670} 671 672void ucb1x00_unregister_driver(struct ucb1x00_driver *drv) 673{ 674 struct list_head *n, *l; 675 676 mutex_lock(&ucb1x00_mutex); 677 list_del(&drv->node); 678 list_for_each_safe(l, n, &drv->devs) { 679 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, drv_node); 680 ucb1x00_remove_dev(dev); 681 } 682 mutex_unlock(&ucb1x00_mutex); 683} 684 685static int ucb1x00_suspend(struct mcp *mcp, pm_message_t state) 686{ 687 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 688 struct ucb1x00_dev *dev; 689 690 mutex_lock(&ucb1x00_mutex); 691 list_for_each_entry(dev, &ucb->devs, dev_node) { 692 if (dev->drv->suspend) 693 dev->drv->suspend(dev, state); 694 } 695 mutex_unlock(&ucb1x00_mutex); 696 return 0; 697} 698 699static int ucb1x00_resume(struct mcp *mcp) 700{ 701 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 702 struct ucb1x00_dev *dev; 703 704 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 705 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 706 mutex_lock(&ucb1x00_mutex); 707 list_for_each_entry(dev, &ucb->devs, dev_node) { 708 if (dev->drv->resume) 709 dev->drv->resume(dev); 710 } 711 mutex_unlock(&ucb1x00_mutex); 712 return 0; 713} 714 715static struct mcp_driver ucb1x00_driver = { 716 .drv = { 717 .name = "ucb1x00", 718 .owner = THIS_MODULE, 719 }, 720 .probe = ucb1x00_probe, 721 .remove = ucb1x00_remove, 722 .suspend = ucb1x00_suspend, 723 .resume = ucb1x00_resume, 724}; 725 726static int __init ucb1x00_init(void) 727{ 728 int ret = class_register(&ucb1x00_class); 729 if (ret == 0) { 730 ret = mcp_driver_register(&ucb1x00_driver); 731 if (ret) 732 class_unregister(&ucb1x00_class); 733 } 734 return ret; 735} 736 737static void __exit ucb1x00_exit(void) 738{ 739 mcp_driver_unregister(&ucb1x00_driver); 740 class_unregister(&ucb1x00_class); 741} 742 743module_init(ucb1x00_init); 744module_exit(ucb1x00_exit); 745 746EXPORT_SYMBOL(ucb1x00_io_set_dir); 747EXPORT_SYMBOL(ucb1x00_io_write); 748EXPORT_SYMBOL(ucb1x00_io_read); 749 750EXPORT_SYMBOL(ucb1x00_adc_enable); 751EXPORT_SYMBOL(ucb1x00_adc_read); 752EXPORT_SYMBOL(ucb1x00_adc_disable); 753 754EXPORT_SYMBOL(ucb1x00_hook_irq); 755EXPORT_SYMBOL(ucb1x00_free_irq); 756EXPORT_SYMBOL(ucb1x00_enable_irq); 757EXPORT_SYMBOL(ucb1x00_disable_irq); 758 759EXPORT_SYMBOL(ucb1x00_register_driver); 760EXPORT_SYMBOL(ucb1x00_unregister_driver); 761 762MODULE_ALIAS("mcp:ucb1x00"); 763MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 764MODULE_DESCRIPTION("UCB1x00 core driver"); 765MODULE_LICENSE("GPL"); 766