ucb1x00-core.c revision 5dd7bf59e0e8563265b3e5b33276099ef628fcc7
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#include <linux/semaphore.h> 31 32#include <mach/dma.h> 33#include <mach/hardware.h> 34 35static DEFINE_MUTEX(ucb1x00_mutex); 36static LIST_HEAD(ucb1x00_drivers); 37static LIST_HEAD(ucb1x00_devices); 38 39static struct mcp_device_id ucb1x00_id[] = { 40 { "ucb1x00", 0 }, /* auto-detection */ 41 { "ucb1200", UCB_ID_1200 }, 42 { "ucb1300", UCB_ID_1300 }, 43 { "tc35143", UCB_ID_TC35143 }, 44 { } 45}; 46MODULE_DEVICE_TABLE(mcp, ucb1x00_id); 47 48/** 49 * ucb1x00_io_set_dir - set IO direction 50 * @ucb: UCB1x00 structure describing chip 51 * @in: bitfield of IO pins to be set as inputs 52 * @out: bitfield of IO pins to be set as outputs 53 * 54 * Set the IO direction of the ten general purpose IO pins on 55 * the UCB1x00 chip. The @in bitfield has priority over the 56 * @out bitfield, in that if you specify a pin as both input 57 * and output, it will end up as an input. 58 * 59 * ucb1x00_enable must have been called to enable the comms 60 * before using this function. 61 * 62 * This function takes a spinlock, disabling interrupts. 63 */ 64void ucb1x00_io_set_dir(struct ucb1x00 *ucb, unsigned int in, unsigned int out) 65{ 66 unsigned long flags; 67 68 spin_lock_irqsave(&ucb->io_lock, flags); 69 ucb->io_dir |= out; 70 ucb->io_dir &= ~in; 71 72 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 73 spin_unlock_irqrestore(&ucb->io_lock, flags); 74} 75 76/** 77 * ucb1x00_io_write - set or clear IO outputs 78 * @ucb: UCB1x00 structure describing chip 79 * @set: bitfield of IO pins to set to logic '1' 80 * @clear: bitfield of IO pins to set to logic '0' 81 * 82 * Set the IO output state of the specified IO pins. The value 83 * is retained if the pins are subsequently configured as inputs. 84 * The @clear bitfield has priority over the @set bitfield - 85 * outputs will be cleared. 86 * 87 * ucb1x00_enable must have been called to enable the comms 88 * before using this function. 89 * 90 * This function takes a spinlock, disabling interrupts. 91 */ 92void ucb1x00_io_write(struct ucb1x00 *ucb, unsigned int set, unsigned int clear) 93{ 94 unsigned long flags; 95 96 spin_lock_irqsave(&ucb->io_lock, flags); 97 ucb->io_out |= set; 98 ucb->io_out &= ~clear; 99 100 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 101 spin_unlock_irqrestore(&ucb->io_lock, flags); 102} 103 104/** 105 * ucb1x00_io_read - read the current state of the IO pins 106 * @ucb: UCB1x00 structure describing chip 107 * 108 * Return a bitfield describing the logic state of the ten 109 * general purpose IO pins. 110 * 111 * ucb1x00_enable must have been called to enable the comms 112 * before using this function. 113 * 114 * This function does not take any semaphores or spinlocks. 115 */ 116unsigned int ucb1x00_io_read(struct ucb1x00 *ucb) 117{ 118 return ucb1x00_reg_read(ucb, UCB_IO_DATA); 119} 120 121static void ucb1x00_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 122{ 123 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 124 unsigned long flags; 125 126 spin_lock_irqsave(&ucb->io_lock, flags); 127 if (value) 128 ucb->io_out |= 1 << offset; 129 else 130 ucb->io_out &= ~(1 << offset); 131 132 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 133 spin_unlock_irqrestore(&ucb->io_lock, flags); 134} 135 136static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset) 137{ 138 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 139 return ucb1x00_reg_read(ucb, UCB_IO_DATA) & (1 << offset); 140} 141 142static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 143{ 144 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 145 unsigned long flags; 146 147 spin_lock_irqsave(&ucb->io_lock, flags); 148 ucb->io_dir &= ~(1 << offset); 149 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 150 spin_unlock_irqrestore(&ucb->io_lock, flags); 151 152 return 0; 153} 154 155static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset 156 , int value) 157{ 158 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); 159 unsigned long flags; 160 161 spin_lock_irqsave(&ucb->io_lock, flags); 162 ucb->io_dir |= (1 << offset); 163 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 164 165 if (value) 166 ucb->io_out |= 1 << offset; 167 else 168 ucb->io_out &= ~(1 << offset); 169 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); 170 spin_unlock_irqrestore(&ucb->io_lock, flags); 171 172 return 0; 173} 174 175/* 176 * UCB1300 data sheet says we must: 177 * 1. enable ADC => 5us (including reference startup time) 178 * 2. select input => 51*tsibclk => 4.3us 179 * 3. start conversion => 102*tsibclk => 8.5us 180 * (tsibclk = 1/11981000) 181 * Period between SIB 128-bit frames = 10.7us 182 */ 183 184/** 185 * ucb1x00_adc_enable - enable the ADC converter 186 * @ucb: UCB1x00 structure describing chip 187 * 188 * Enable the ucb1x00 and ADC converter on the UCB1x00 for use. 189 * Any code wishing to use the ADC converter must call this 190 * function prior to using it. 191 * 192 * This function takes the ADC semaphore to prevent two or more 193 * concurrent uses, and therefore may sleep. As a result, it 194 * can only be called from process context, not interrupt 195 * context. 196 * 197 * You should release the ADC as soon as possible using 198 * ucb1x00_adc_disable. 199 */ 200void ucb1x00_adc_enable(struct ucb1x00 *ucb) 201{ 202 down(&ucb->adc_sem); 203 204 ucb->adc_cr |= UCB_ADC_ENA; 205 206 ucb1x00_enable(ucb); 207 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); 208} 209 210/** 211 * ucb1x00_adc_read - read the specified ADC channel 212 * @ucb: UCB1x00 structure describing chip 213 * @adc_channel: ADC channel mask 214 * @sync: wait for syncronisation pulse. 215 * 216 * Start an ADC conversion and wait for the result. Note that 217 * synchronised ADC conversions (via the ADCSYNC pin) must wait 218 * until the trigger is asserted and the conversion is finished. 219 * 220 * This function currently spins waiting for the conversion to 221 * complete (2 frames max without sync). 222 * 223 * If called for a synchronised ADC conversion, it may sleep 224 * with the ADC semaphore held. 225 */ 226unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync) 227{ 228 unsigned int val; 229 230 if (sync) 231 adc_channel |= UCB_ADC_SYNC_ENA; 232 233 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel); 234 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel | UCB_ADC_START); 235 236 for (;;) { 237 val = ucb1x00_reg_read(ucb, UCB_ADC_DATA); 238 if (val & UCB_ADC_DAT_VAL) 239 break; 240 /* yield to other processes */ 241 set_current_state(TASK_INTERRUPTIBLE); 242 schedule_timeout(1); 243 } 244 245 return UCB_ADC_DAT(val); 246} 247 248/** 249 * ucb1x00_adc_disable - disable the ADC converter 250 * @ucb: UCB1x00 structure describing chip 251 * 252 * Disable the ADC converter and release the ADC semaphore. 253 */ 254void ucb1x00_adc_disable(struct ucb1x00 *ucb) 255{ 256 ucb->adc_cr &= ~UCB_ADC_ENA; 257 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); 258 ucb1x00_disable(ucb); 259 260 up(&ucb->adc_sem); 261} 262 263/* 264 * UCB1x00 Interrupt handling. 265 * 266 * The UCB1x00 can generate interrupts when the SIBCLK is stopped. 267 * Since we need to read an internal register, we must re-enable 268 * SIBCLK to talk to the chip. We leave the clock running until 269 * we have finished processing all interrupts from the chip. 270 */ 271static irqreturn_t ucb1x00_irq(int irqnr, void *devid) 272{ 273 struct ucb1x00 *ucb = devid; 274 struct ucb1x00_irq *irq; 275 unsigned int isr, i; 276 277 ucb1x00_enable(ucb); 278 isr = ucb1x00_reg_read(ucb, UCB_IE_STATUS); 279 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr); 280 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 281 282 for (i = 0, irq = ucb->irq_handler; i < 16 && isr; i++, isr >>= 1, irq++) 283 if (isr & 1 && irq->fn) 284 irq->fn(i, irq->devid); 285 ucb1x00_disable(ucb); 286 287 return IRQ_HANDLED; 288} 289 290/** 291 * ucb1x00_hook_irq - hook a UCB1x00 interrupt 292 * @ucb: UCB1x00 structure describing chip 293 * @idx: interrupt index 294 * @fn: function to call when interrupt is triggered 295 * @devid: device id to pass to interrupt handler 296 * 297 * Hook the specified interrupt. You can only register one handler 298 * for each interrupt source. The interrupt source is not enabled 299 * by this function; use ucb1x00_enable_irq instead. 300 * 301 * Interrupt handlers will be called with other interrupts enabled. 302 * 303 * Returns zero on success, or one of the following errors: 304 * -EINVAL if the interrupt index is invalid 305 * -EBUSY if the interrupt has already been hooked 306 */ 307int ucb1x00_hook_irq(struct ucb1x00 *ucb, unsigned int idx, void (*fn)(int, void *), void *devid) 308{ 309 struct ucb1x00_irq *irq; 310 int ret = -EINVAL; 311 312 if (idx < 16) { 313 irq = ucb->irq_handler + idx; 314 ret = -EBUSY; 315 316 spin_lock_irq(&ucb->lock); 317 if (irq->fn == NULL) { 318 irq->devid = devid; 319 irq->fn = fn; 320 ret = 0; 321 } 322 spin_unlock_irq(&ucb->lock); 323 } 324 return ret; 325} 326 327/** 328 * ucb1x00_enable_irq - enable an UCB1x00 interrupt source 329 * @ucb: UCB1x00 structure describing chip 330 * @idx: interrupt index 331 * @edges: interrupt edges to enable 332 * 333 * Enable the specified interrupt to trigger on %UCB_RISING, 334 * %UCB_FALLING or both edges. The interrupt should have been 335 * hooked by ucb1x00_hook_irq. 336 */ 337void ucb1x00_enable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) 338{ 339 unsigned long flags; 340 341 if (idx < 16) { 342 spin_lock_irqsave(&ucb->lock, flags); 343 344 ucb1x00_enable(ucb); 345 if (edges & UCB_RISING) { 346 ucb->irq_ris_enbl |= 1 << idx; 347 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 348 } 349 if (edges & UCB_FALLING) { 350 ucb->irq_fal_enbl |= 1 << idx; 351 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 352 } 353 ucb1x00_disable(ucb); 354 spin_unlock_irqrestore(&ucb->lock, flags); 355 } 356} 357 358/** 359 * ucb1x00_disable_irq - disable an UCB1x00 interrupt source 360 * @ucb: UCB1x00 structure describing chip 361 * @edges: interrupt edges to disable 362 * 363 * Disable the specified interrupt triggering on the specified 364 * (%UCB_RISING, %UCB_FALLING or both) edges. 365 */ 366void ucb1x00_disable_irq(struct ucb1x00 *ucb, unsigned int idx, int edges) 367{ 368 unsigned long flags; 369 370 if (idx < 16) { 371 spin_lock_irqsave(&ucb->lock, flags); 372 373 ucb1x00_enable(ucb); 374 if (edges & UCB_RISING) { 375 ucb->irq_ris_enbl &= ~(1 << idx); 376 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 377 } 378 if (edges & UCB_FALLING) { 379 ucb->irq_fal_enbl &= ~(1 << idx); 380 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 381 } 382 ucb1x00_disable(ucb); 383 spin_unlock_irqrestore(&ucb->lock, flags); 384 } 385} 386 387/** 388 * ucb1x00_free_irq - disable and free the specified UCB1x00 interrupt 389 * @ucb: UCB1x00 structure describing chip 390 * @idx: interrupt index 391 * @devid: device id. 392 * 393 * Disable the interrupt source and remove the handler. devid must 394 * match the devid passed when hooking the interrupt. 395 * 396 * Returns zero on success, or one of the following errors: 397 * -EINVAL if the interrupt index is invalid 398 * -ENOENT if devid does not match 399 */ 400int ucb1x00_free_irq(struct ucb1x00 *ucb, unsigned int idx, void *devid) 401{ 402 struct ucb1x00_irq *irq; 403 int ret; 404 405 if (idx >= 16) 406 goto bad; 407 408 irq = ucb->irq_handler + idx; 409 ret = -ENOENT; 410 411 spin_lock_irq(&ucb->lock); 412 if (irq->devid == devid) { 413 ucb->irq_ris_enbl &= ~(1 << idx); 414 ucb->irq_fal_enbl &= ~(1 << idx); 415 416 ucb1x00_enable(ucb); 417 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl); 418 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl); 419 ucb1x00_disable(ucb); 420 421 irq->fn = NULL; 422 irq->devid = NULL; 423 ret = 0; 424 } 425 spin_unlock_irq(&ucb->lock); 426 return ret; 427 428bad: 429 printk(KERN_ERR "Freeing bad UCB1x00 irq %d\n", idx); 430 return -EINVAL; 431} 432 433static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv) 434{ 435 struct ucb1x00_dev *dev; 436 int ret = -ENOMEM; 437 438 dev = kmalloc(sizeof(struct ucb1x00_dev), GFP_KERNEL); 439 if (dev) { 440 dev->ucb = ucb; 441 dev->drv = drv; 442 443 ret = drv->add(dev); 444 445 if (ret == 0) { 446 list_add(&dev->dev_node, &ucb->devs); 447 list_add(&dev->drv_node, &drv->devs); 448 } else { 449 kfree(dev); 450 } 451 } 452 return ret; 453} 454 455static void ucb1x00_remove_dev(struct ucb1x00_dev *dev) 456{ 457 dev->drv->remove(dev); 458 list_del(&dev->dev_node); 459 list_del(&dev->drv_node); 460 kfree(dev); 461} 462 463/* 464 * Try to probe our interrupt, rather than relying on lots of 465 * hard-coded machine dependencies. For reference, the expected 466 * IRQ mappings are: 467 * 468 * Machine Default IRQ 469 * adsbitsy IRQ_GPCIN4 470 * cerf IRQ_GPIO_UCB1200_IRQ 471 * flexanet IRQ_GPIO_GUI 472 * freebird IRQ_GPIO_FREEBIRD_UCB1300_IRQ 473 * graphicsclient ADS_EXT_IRQ(8) 474 * graphicsmaster ADS_EXT_IRQ(8) 475 * lart LART_IRQ_UCB1200 476 * omnimeter IRQ_GPIO23 477 * pfs168 IRQ_GPIO_UCB1300_IRQ 478 * simpad IRQ_GPIO_UCB1300_IRQ 479 * shannon SHANNON_IRQ_GPIO_IRQ_CODEC 480 * yopy IRQ_GPIO_UCB1200_IRQ 481 */ 482static int ucb1x00_detect_irq(struct ucb1x00 *ucb) 483{ 484 unsigned long mask; 485 486 mask = probe_irq_on(); 487 if (!mask) { 488 probe_irq_off(mask); 489 return NO_IRQ; 490 } 491 492 /* 493 * Enable the ADC interrupt. 494 */ 495 ucb1x00_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC); 496 ucb1x00_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC); 497 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); 498 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 499 500 /* 501 * Cause an ADC interrupt. 502 */ 503 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA); 504 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START); 505 506 /* 507 * Wait for the conversion to complete. 508 */ 509 while ((ucb1x00_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VAL) == 0); 510 ucb1x00_reg_write(ucb, UCB_ADC_CR, 0); 511 512 /* 513 * Disable and clear interrupt. 514 */ 515 ucb1x00_reg_write(ucb, UCB_IE_RIS, 0); 516 ucb1x00_reg_write(ucb, UCB_IE_FAL, 0); 517 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); 518 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); 519 520 /* 521 * Read triggered interrupt. 522 */ 523 return probe_irq_off(mask); 524} 525 526static void ucb1x00_release(struct device *dev) 527{ 528 struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); 529 kfree(ucb); 530} 531 532static struct class ucb1x00_class = { 533 .name = "ucb1x00", 534 .dev_release = ucb1x00_release, 535}; 536 537static int ucb1x00_probe(struct mcp *mcp) 538{ 539 const struct mcp_device_id *mid; 540 struct ucb1x00 *ucb; 541 struct ucb1x00_driver *drv; 542 struct ucb1x00_plat_data *pdata; 543 unsigned int id; 544 int ret = -ENODEV; 545 int temp; 546 547 mcp_enable(mcp); 548 id = mcp_reg_read(mcp, UCB_ID); 549 mid = mcp_get_device_id(mcp); 550 551 if (mid && mid->driver_data) { 552 if (id != mid->driver_data) { 553 printk(KERN_WARNING "%s wrong ID %04x found: %04x\n", 554 mid->name, (unsigned int) mid->driver_data, id); 555 goto err_disable; 556 } 557 } else { 558 mid = &ucb1x00_id[1]; 559 while (mid->driver_data) { 560 if (id == mid->driver_data) 561 break; 562 mid++; 563 } 564 printk(KERN_WARNING "%s ID not found: %04x\n", 565 ucb1x00_id[0].name, id); 566 goto err_disable; 567 } 568 569 ucb = kzalloc(sizeof(struct ucb1x00), GFP_KERNEL); 570 ret = -ENOMEM; 571 if (!ucb) 572 goto err_disable; 573 574 pdata = mcp->attached_device.platform_data; 575 ucb->dev.class = &ucb1x00_class; 576 ucb->dev.parent = &mcp->attached_device; 577 dev_set_name(&ucb->dev, mid->name); 578 579 spin_lock_init(&ucb->lock); 580 spin_lock_init(&ucb->io_lock); 581 sema_init(&ucb->adc_sem, 1); 582 583 ucb->id = mid; 584 ucb->mcp = mcp; 585 ucb->irq = ucb1x00_detect_irq(ucb); 586 if (ucb->irq == NO_IRQ) { 587 printk(KERN_ERR "%s: IRQ probe failed\n", mid->name); 588 ret = -ENODEV; 589 goto err_free; 590 } 591 592 ucb->gpio.base = -1; 593 if (pdata && (pdata->gpio_base >= 0)) { 594 ucb->gpio.label = dev_name(&ucb->dev); 595 ucb->gpio.base = pdata->gpio_base; 596 ucb->gpio.ngpio = 10; 597 ucb->gpio.set = ucb1x00_gpio_set; 598 ucb->gpio.get = ucb1x00_gpio_get; 599 ucb->gpio.direction_input = ucb1x00_gpio_direction_input; 600 ucb->gpio.direction_output = ucb1x00_gpio_direction_output; 601 ret = gpiochip_add(&ucb->gpio); 602 if (ret) 603 goto err_free; 604 } else 605 dev_info(&ucb->dev, "gpio_base not set so no gpiolib support"); 606 607 ret = request_irq(ucb->irq, ucb1x00_irq, IRQF_TRIGGER_RISING, 608 mid->name, ucb); 609 if (ret) { 610 printk(KERN_ERR "%s: unable to grab irq%d: %d\n", 611 mid->name, ucb->irq, ret); 612 goto err_gpio; 613 } 614 615 mcp_set_drvdata(mcp, ucb); 616 617 ret = device_register(&ucb->dev); 618 if (ret) 619 goto err_irq; 620 621 622 INIT_LIST_HEAD(&ucb->devs); 623 mutex_lock(&ucb1x00_mutex); 624 list_add(&ucb->node, &ucb1x00_devices); 625 list_for_each_entry(drv, &ucb1x00_drivers, node) { 626 ucb1x00_add_dev(ucb, drv); 627 } 628 mutex_unlock(&ucb1x00_mutex); 629 630 goto out; 631 632 err_irq: 633 free_irq(ucb->irq, ucb); 634 err_gpio: 635 if (ucb->gpio.base != -1) 636 temp = gpiochip_remove(&ucb->gpio); 637 err_free: 638 kfree(ucb); 639 err_disable: 640 mcp_disable(mcp); 641 out: 642 return ret; 643} 644 645static void ucb1x00_remove(struct mcp *mcp) 646{ 647 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 648 struct list_head *l, *n; 649 int ret; 650 651 mutex_lock(&ucb1x00_mutex); 652 list_del(&ucb->node); 653 list_for_each_safe(l, n, &ucb->devs) { 654 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, dev_node); 655 ucb1x00_remove_dev(dev); 656 } 657 mutex_unlock(&ucb1x00_mutex); 658 659 if (ucb->gpio.base != -1) { 660 ret = gpiochip_remove(&ucb->gpio); 661 if (ret) 662 dev_err(&ucb->dev, "Can't remove gpio chip: %d\n", ret); 663 } 664 665 free_irq(ucb->irq, ucb); 666 device_unregister(&ucb->dev); 667} 668 669int ucb1x00_register_driver(struct ucb1x00_driver *drv) 670{ 671 struct ucb1x00 *ucb; 672 673 INIT_LIST_HEAD(&drv->devs); 674 mutex_lock(&ucb1x00_mutex); 675 list_add(&drv->node, &ucb1x00_drivers); 676 list_for_each_entry(ucb, &ucb1x00_devices, node) { 677 ucb1x00_add_dev(ucb, drv); 678 } 679 mutex_unlock(&ucb1x00_mutex); 680 return 0; 681} 682 683void ucb1x00_unregister_driver(struct ucb1x00_driver *drv) 684{ 685 struct list_head *n, *l; 686 687 mutex_lock(&ucb1x00_mutex); 688 list_del(&drv->node); 689 list_for_each_safe(l, n, &drv->devs) { 690 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, drv_node); 691 ucb1x00_remove_dev(dev); 692 } 693 mutex_unlock(&ucb1x00_mutex); 694} 695 696static int ucb1x00_suspend(struct mcp *mcp, pm_message_t state) 697{ 698 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 699 struct ucb1x00_dev *dev; 700 701 mutex_lock(&ucb1x00_mutex); 702 list_for_each_entry(dev, &ucb->devs, dev_node) { 703 if (dev->drv->suspend) 704 dev->drv->suspend(dev, state); 705 } 706 mutex_unlock(&ucb1x00_mutex); 707 return 0; 708} 709 710static int ucb1x00_resume(struct mcp *mcp) 711{ 712 struct ucb1x00 *ucb = mcp_get_drvdata(mcp); 713 struct ucb1x00_dev *dev; 714 715 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); 716 mutex_lock(&ucb1x00_mutex); 717 list_for_each_entry(dev, &ucb->devs, dev_node) { 718 if (dev->drv->resume) 719 dev->drv->resume(dev); 720 } 721 mutex_unlock(&ucb1x00_mutex); 722 return 0; 723} 724 725static struct mcp_driver ucb1x00_driver = { 726 .drv = { 727 .name = "ucb1x00", 728 }, 729 .probe = ucb1x00_probe, 730 .remove = ucb1x00_remove, 731 .suspend = ucb1x00_suspend, 732 .resume = ucb1x00_resume, 733 .id_table = ucb1x00_id, 734}; 735 736static int __init ucb1x00_init(void) 737{ 738 int ret = class_register(&ucb1x00_class); 739 if (ret == 0) { 740 ret = mcp_driver_register(&ucb1x00_driver); 741 if (ret) 742 class_unregister(&ucb1x00_class); 743 } 744 return ret; 745} 746 747static void __exit ucb1x00_exit(void) 748{ 749 mcp_driver_unregister(&ucb1x00_driver); 750 class_unregister(&ucb1x00_class); 751} 752 753module_init(ucb1x00_init); 754module_exit(ucb1x00_exit); 755 756EXPORT_SYMBOL(ucb1x00_io_set_dir); 757EXPORT_SYMBOL(ucb1x00_io_write); 758EXPORT_SYMBOL(ucb1x00_io_read); 759 760EXPORT_SYMBOL(ucb1x00_adc_enable); 761EXPORT_SYMBOL(ucb1x00_adc_read); 762EXPORT_SYMBOL(ucb1x00_adc_disable); 763 764EXPORT_SYMBOL(ucb1x00_hook_irq); 765EXPORT_SYMBOL(ucb1x00_free_irq); 766EXPORT_SYMBOL(ucb1x00_enable_irq); 767EXPORT_SYMBOL(ucb1x00_disable_irq); 768 769EXPORT_SYMBOL(ucb1x00_register_driver); 770EXPORT_SYMBOL(ucb1x00_unregister_driver); 771 772MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 773MODULE_DESCRIPTION("UCB1x00 core driver"); 774MODULE_LICENSE("GPL"); 775