1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/mfd/ucb1x00-core.c
5 * Copyright (C) 2001 Russell King, All Rights Reserved.
7 * The UCB1x00 core driver provides basic services for handling IO,
8 * the ADC, interrupts, and accessing registers. It is designed
9 * such that everything goes through this layer, thereby providing
10 * a consistent locking methodology, as well as allowing the drivers
11 * to be used on other non-MCP-enabled hardware platforms.
13 * Note that all locks are private to this file. Nothing else may
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/device.h>
25 #include <linux/mutex.h>
26 #include <linux/mfd/ucb1x00.h>
28 #include <linux/gpio/driver.h>
30 static DEFINE_MUTEX(ucb1x00_mutex);
31 static LIST_HEAD(ucb1x00_drivers);
32 static LIST_HEAD(ucb1x00_devices);
35 * ucb1x00_io_set_dir - set IO direction
36 * @ucb: UCB1x00 structure describing chip
37 * @in: bitfield of IO pins to be set as inputs
38 * @out: bitfield of IO pins to be set as outputs
40 * Set the IO direction of the ten general purpose IO pins on
41 * the UCB1x00 chip. The @in bitfield has priority over the
42 * @out bitfield, in that if you specify a pin as both input
43 * and output, it will end up as an input.
45 * ucb1x00_enable must have been called to enable the comms
46 * before using this function.
48 * This function takes a spinlock, disabling interrupts.
50 void ucb1x00_io_set_dir(struct ucb1x00 *ucb, unsigned int in, unsigned int out)
54 spin_lock_irqsave(&ucb->io_lock, flags);
58 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
59 spin_unlock_irqrestore(&ucb->io_lock, flags);
63 * ucb1x00_io_write - set or clear IO outputs
64 * @ucb: UCB1x00 structure describing chip
65 * @set: bitfield of IO pins to set to logic '1'
66 * @clear: bitfield of IO pins to set to logic '0'
68 * Set the IO output state of the specified IO pins. The value
69 * is retained if the pins are subsequently configured as inputs.
70 * The @clear bitfield has priority over the @set bitfield -
71 * outputs will be cleared.
73 * ucb1x00_enable must have been called to enable the comms
74 * before using this function.
76 * This function takes a spinlock, disabling interrupts.
78 void ucb1x00_io_write(struct ucb1x00 *ucb, unsigned int set, unsigned int clear)
82 spin_lock_irqsave(&ucb->io_lock, flags);
84 ucb->io_out &= ~clear;
86 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
87 spin_unlock_irqrestore(&ucb->io_lock, flags);
91 * ucb1x00_io_read - read the current state of the IO pins
92 * @ucb: UCB1x00 structure describing chip
94 * Return a bitfield describing the logic state of the ten
95 * general purpose IO pins.
97 * ucb1x00_enable must have been called to enable the comms
98 * before using this function.
100 * This function does not take any mutexes or spinlocks.
102 unsigned int ucb1x00_io_read(struct ucb1x00 *ucb)
104 return ucb1x00_reg_read(ucb, UCB_IO_DATA);
107 static void ucb1x00_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
109 struct ucb1x00 *ucb = gpiochip_get_data(chip);
112 spin_lock_irqsave(&ucb->io_lock, flags);
114 ucb->io_out |= 1 << offset;
116 ucb->io_out &= ~(1 << offset);
119 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
120 ucb1x00_disable(ucb);
121 spin_unlock_irqrestore(&ucb->io_lock, flags);
124 static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset)
126 struct ucb1x00 *ucb = gpiochip_get_data(chip);
130 val = ucb1x00_reg_read(ucb, UCB_IO_DATA);
131 ucb1x00_disable(ucb);
133 return !!(val & (1 << offset));
136 static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
138 struct ucb1x00 *ucb = gpiochip_get_data(chip);
141 spin_lock_irqsave(&ucb->io_lock, flags);
142 ucb->io_dir &= ~(1 << offset);
144 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
145 ucb1x00_disable(ucb);
146 spin_unlock_irqrestore(&ucb->io_lock, flags);
151 static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset
154 struct ucb1x00 *ucb = gpiochip_get_data(chip);
156 unsigned old, mask = 1 << offset;
158 spin_lock_irqsave(&ucb->io_lock, flags);
163 ucb->io_out &= ~mask;
166 if (old != ucb->io_out)
167 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
169 if (!(ucb->io_dir & mask)) {
171 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
173 ucb1x00_disable(ucb);
174 spin_unlock_irqrestore(&ucb->io_lock, flags);
179 static int ucb1x00_to_irq(struct gpio_chip *chip, unsigned offset)
181 struct ucb1x00 *ucb = gpiochip_get_data(chip);
183 return ucb->irq_base > 0 ? ucb->irq_base + offset : -ENXIO;
187 * UCB1300 data sheet says we must:
188 * 1. enable ADC => 5us (including reference startup time)
189 * 2. select input => 51*tsibclk => 4.3us
190 * 3. start conversion => 102*tsibclk => 8.5us
191 * (tsibclk = 1/11981000)
192 * Period between SIB 128-bit frames = 10.7us
196 * ucb1x00_adc_enable - enable the ADC converter
197 * @ucb: UCB1x00 structure describing chip
199 * Enable the ucb1x00 and ADC converter on the UCB1x00 for use.
200 * Any code wishing to use the ADC converter must call this
201 * function prior to using it.
203 * This function takes the ADC mutex to prevent two or more
204 * concurrent uses, and therefore may sleep. As a result, it
205 * can only be called from process context, not interrupt
208 * You should release the ADC as soon as possible using
209 * ucb1x00_adc_disable.
211 void ucb1x00_adc_enable(struct ucb1x00 *ucb)
213 mutex_lock(&ucb->adc_mutex);
215 ucb->adc_cr |= UCB_ADC_ENA;
218 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr);
222 * ucb1x00_adc_read - read the specified ADC channel
223 * @ucb: UCB1x00 structure describing chip
224 * @adc_channel: ADC channel mask
225 * @sync: wait for syncronisation pulse.
227 * Start an ADC conversion and wait for the result. Note that
228 * synchronised ADC conversions (via the ADCSYNC pin) must wait
229 * until the trigger is asserted and the conversion is finished.
231 * This function currently spins waiting for the conversion to
232 * complete (2 frames max without sync).
234 * If called for a synchronised ADC conversion, it may sleep
235 * with the ADC mutex held.
237 unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync)
242 adc_channel |= UCB_ADC_SYNC_ENA;
244 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel);
245 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel | UCB_ADC_START);
248 val = ucb1x00_reg_read(ucb, UCB_ADC_DATA);
249 if (val & UCB_ADC_DAT_VAL)
251 /* yield to other processes */
252 set_current_state(TASK_INTERRUPTIBLE);
256 return UCB_ADC_DAT(val);
260 * ucb1x00_adc_disable - disable the ADC converter
261 * @ucb: UCB1x00 structure describing chip
263 * Disable the ADC converter and release the ADC mutex.
265 void ucb1x00_adc_disable(struct ucb1x00 *ucb)
267 ucb->adc_cr &= ~UCB_ADC_ENA;
268 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr);
269 ucb1x00_disable(ucb);
271 mutex_unlock(&ucb->adc_mutex);
275 * UCB1x00 Interrupt handling.
277 * The UCB1x00 can generate interrupts when the SIBCLK is stopped.
278 * Since we need to read an internal register, we must re-enable
279 * SIBCLK to talk to the chip. We leave the clock running until
280 * we have finished processing all interrupts from the chip.
282 static void ucb1x00_irq(struct irq_desc *desc)
284 struct ucb1x00 *ucb = irq_desc_get_handler_data(desc);
288 isr = ucb1x00_reg_read(ucb, UCB_IE_STATUS);
289 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr);
290 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
292 for (i = 0; i < 16 && isr; i++, isr >>= 1)
294 generic_handle_irq(ucb->irq_base + i);
295 ucb1x00_disable(ucb);
298 static void ucb1x00_irq_update(struct ucb1x00 *ucb, unsigned mask)
301 if (ucb->irq_ris_enbl & mask)
302 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
304 if (ucb->irq_fal_enbl & mask)
305 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
307 ucb1x00_disable(ucb);
310 static void ucb1x00_irq_noop(struct irq_data *data)
314 static void ucb1x00_irq_mask(struct irq_data *data)
316 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
317 unsigned mask = 1 << (data->irq - ucb->irq_base);
319 raw_spin_lock(&ucb->irq_lock);
320 ucb->irq_mask &= ~mask;
321 ucb1x00_irq_update(ucb, mask);
322 raw_spin_unlock(&ucb->irq_lock);
325 static void ucb1x00_irq_unmask(struct irq_data *data)
327 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
328 unsigned mask = 1 << (data->irq - ucb->irq_base);
330 raw_spin_lock(&ucb->irq_lock);
331 ucb->irq_mask |= mask;
332 ucb1x00_irq_update(ucb, mask);
333 raw_spin_unlock(&ucb->irq_lock);
336 static int ucb1x00_irq_set_type(struct irq_data *data, unsigned int type)
338 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
339 unsigned mask = 1 << (data->irq - ucb->irq_base);
341 raw_spin_lock(&ucb->irq_lock);
342 if (type & IRQ_TYPE_EDGE_RISING)
343 ucb->irq_ris_enbl |= mask;
345 ucb->irq_ris_enbl &= ~mask;
347 if (type & IRQ_TYPE_EDGE_FALLING)
348 ucb->irq_fal_enbl |= mask;
350 ucb->irq_fal_enbl &= ~mask;
351 if (ucb->irq_mask & mask) {
352 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
354 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
357 raw_spin_unlock(&ucb->irq_lock);
362 static int ucb1x00_irq_set_wake(struct irq_data *data, unsigned int on)
364 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
365 struct ucb1x00_plat_data *pdata = ucb->mcp->attached_device.platform_data;
366 unsigned mask = 1 << (data->irq - ucb->irq_base);
368 if (!pdata || !pdata->can_wakeup)
371 raw_spin_lock(&ucb->irq_lock);
373 ucb->irq_wake |= mask;
375 ucb->irq_wake &= ~mask;
376 raw_spin_unlock(&ucb->irq_lock);
381 static struct irq_chip ucb1x00_irqchip = {
383 .irq_ack = ucb1x00_irq_noop,
384 .irq_mask = ucb1x00_irq_mask,
385 .irq_unmask = ucb1x00_irq_unmask,
386 .irq_set_type = ucb1x00_irq_set_type,
387 .irq_set_wake = ucb1x00_irq_set_wake,
390 static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv)
392 struct ucb1x00_dev *dev;
395 dev = kmalloc(sizeof(struct ucb1x00_dev), GFP_KERNEL);
408 list_add_tail(&dev->dev_node, &ucb->devs);
409 list_add_tail(&dev->drv_node, &drv->devs);
414 static void ucb1x00_remove_dev(struct ucb1x00_dev *dev)
416 dev->drv->remove(dev);
417 list_del(&dev->dev_node);
418 list_del(&dev->drv_node);
423 * Try to probe our interrupt, rather than relying on lots of
424 * hard-coded machine dependencies. For reference, the expected
427 * Machine Default IRQ
428 * adsbitsy IRQ_GPCIN4
429 * cerf IRQ_GPIO_UCB1200_IRQ
430 * flexanet IRQ_GPIO_GUI
431 * freebird IRQ_GPIO_FREEBIRD_UCB1300_IRQ
432 * graphicsclient ADS_EXT_IRQ(8)
433 * graphicsmaster ADS_EXT_IRQ(8)
434 * lart LART_IRQ_UCB1200
435 * omnimeter IRQ_GPIO23
436 * pfs168 IRQ_GPIO_UCB1300_IRQ
437 * simpad IRQ_GPIO_UCB1300_IRQ
438 * shannon SHANNON_IRQ_GPIO_IRQ_CODEC
439 * yopy IRQ_GPIO_UCB1200_IRQ
441 static int ucb1x00_detect_irq(struct ucb1x00 *ucb)
445 mask = probe_irq_on();
448 * Enable the ADC interrupt.
450 ucb1x00_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC);
451 ucb1x00_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC);
452 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
453 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
456 * Cause an ADC interrupt.
458 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA);
459 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);
462 * Wait for the conversion to complete.
464 while ((ucb1x00_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VAL) == 0);
465 ucb1x00_reg_write(ucb, UCB_ADC_CR, 0);
468 * Disable and clear interrupt.
470 ucb1x00_reg_write(ucb, UCB_IE_RIS, 0);
471 ucb1x00_reg_write(ucb, UCB_IE_FAL, 0);
472 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
473 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
476 * Read triggered interrupt.
478 return probe_irq_off(mask);
481 static void ucb1x00_release(struct device *dev)
483 struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);
487 static struct class ucb1x00_class = {
489 .dev_release = ucb1x00_release,
492 static int ucb1x00_probe(struct mcp *mcp)
494 struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data;
495 struct ucb1x00_driver *drv;
497 unsigned id, i, irq_base;
500 /* Tell the platform to deassert the UCB1x00 reset */
501 if (pdata && pdata->reset)
502 pdata->reset(UCB_RST_PROBE);
505 id = mcp_reg_read(mcp, UCB_ID);
508 if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143) {
509 printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id);
513 ucb = kzalloc(sizeof(struct ucb1x00), GFP_KERNEL);
518 device_initialize(&ucb->dev);
519 ucb->dev.class = &ucb1x00_class;
520 ucb->dev.parent = &mcp->attached_device;
521 dev_set_name(&ucb->dev, "ucb1x00");
523 raw_spin_lock_init(&ucb->irq_lock);
524 spin_lock_init(&ucb->io_lock);
525 mutex_init(&ucb->adc_mutex);
530 ret = device_add(&ucb->dev);
535 ucb->irq = ucb1x00_detect_irq(ucb);
536 ucb1x00_disable(ucb);
538 dev_err(&ucb->dev, "IRQ probe failed\n");
544 irq_base = pdata ? pdata->irq_base : 0;
545 ucb->irq_base = irq_alloc_descs(-1, irq_base, 16, -1);
546 if (ucb->irq_base < 0) {
547 dev_err(&ucb->dev, "unable to allocate 16 irqs: %d\n",
553 for (i = 0; i < 16; i++) {
554 unsigned irq = ucb->irq_base + i;
556 irq_set_chip_and_handler(irq, &ucb1x00_irqchip, handle_edge_irq);
557 irq_set_chip_data(irq, ucb);
558 irq_clear_status_flags(irq, IRQ_NOREQUEST);
561 irq_set_irq_type(ucb->irq, IRQ_TYPE_EDGE_RISING);
562 irq_set_chained_handler_and_data(ucb->irq, ucb1x00_irq, ucb);
564 if (pdata && pdata->gpio_base) {
565 ucb->gpio.label = dev_name(&ucb->dev);
566 ucb->gpio.parent = &ucb->dev;
567 ucb->gpio.owner = THIS_MODULE;
568 ucb->gpio.base = pdata->gpio_base;
569 ucb->gpio.ngpio = 10;
570 ucb->gpio.set = ucb1x00_gpio_set;
571 ucb->gpio.get = ucb1x00_gpio_get;
572 ucb->gpio.direction_input = ucb1x00_gpio_direction_input;
573 ucb->gpio.direction_output = ucb1x00_gpio_direction_output;
574 ucb->gpio.to_irq = ucb1x00_to_irq;
575 ret = gpiochip_add_data(&ucb->gpio, ucb);
579 dev_info(&ucb->dev, "gpio_base not set so no gpiolib support");
581 mcp_set_drvdata(mcp, ucb);
584 device_set_wakeup_capable(&ucb->dev, pdata->can_wakeup);
586 INIT_LIST_HEAD(&ucb->devs);
587 mutex_lock(&ucb1x00_mutex);
588 list_add_tail(&ucb->node, &ucb1x00_devices);
589 list_for_each_entry(drv, &ucb1x00_drivers, node) {
590 ucb1x00_add_dev(ucb, drv);
592 mutex_unlock(&ucb1x00_mutex);
597 irq_set_chained_handler(ucb->irq, NULL);
599 if (ucb->irq_base > 0)
600 irq_free_descs(ucb->irq_base, 16);
602 device_del(&ucb->dev);
604 put_device(&ucb->dev);
606 if (pdata && pdata->reset)
607 pdata->reset(UCB_RST_PROBE_FAIL);
611 static void ucb1x00_remove(struct mcp *mcp)
613 struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data;
614 struct ucb1x00 *ucb = mcp_get_drvdata(mcp);
615 struct list_head *l, *n;
617 mutex_lock(&ucb1x00_mutex);
618 list_del(&ucb->node);
619 list_for_each_safe(l, n, &ucb->devs) {
620 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, dev_node);
621 ucb1x00_remove_dev(dev);
623 mutex_unlock(&ucb1x00_mutex);
625 if (ucb->gpio.base != -1)
626 gpiochip_remove(&ucb->gpio);
628 irq_set_chained_handler(ucb->irq, NULL);
629 irq_free_descs(ucb->irq_base, 16);
630 device_unregister(&ucb->dev);
632 if (pdata && pdata->reset)
633 pdata->reset(UCB_RST_REMOVE);
636 int ucb1x00_register_driver(struct ucb1x00_driver *drv)
640 INIT_LIST_HEAD(&drv->devs);
641 mutex_lock(&ucb1x00_mutex);
642 list_add_tail(&drv->node, &ucb1x00_drivers);
643 list_for_each_entry(ucb, &ucb1x00_devices, node) {
644 ucb1x00_add_dev(ucb, drv);
646 mutex_unlock(&ucb1x00_mutex);
650 void ucb1x00_unregister_driver(struct ucb1x00_driver *drv)
652 struct list_head *n, *l;
654 mutex_lock(&ucb1x00_mutex);
655 list_del(&drv->node);
656 list_for_each_safe(l, n, &drv->devs) {
657 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, drv_node);
658 ucb1x00_remove_dev(dev);
660 mutex_unlock(&ucb1x00_mutex);
663 #ifdef CONFIG_PM_SLEEP
664 static int ucb1x00_suspend(struct device *dev)
666 struct ucb1x00_plat_data *pdata = dev_get_platdata(dev);
667 struct ucb1x00 *ucb = dev_get_drvdata(dev);
668 struct ucb1x00_dev *udev;
670 mutex_lock(&ucb1x00_mutex);
671 list_for_each_entry(udev, &ucb->devs, dev_node) {
672 if (udev->drv->suspend)
673 udev->drv->suspend(udev);
675 mutex_unlock(&ucb1x00_mutex);
680 raw_spin_lock_irqsave(&ucb->irq_lock, flags);
682 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
684 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
686 ucb1x00_disable(ucb);
687 raw_spin_unlock_irqrestore(&ucb->irq_lock, flags);
689 enable_irq_wake(ucb->irq);
690 } else if (pdata && pdata->reset)
691 pdata->reset(UCB_RST_SUSPEND);
696 static int ucb1x00_resume(struct device *dev)
698 struct ucb1x00_plat_data *pdata = dev_get_platdata(dev);
699 struct ucb1x00 *ucb = dev_get_drvdata(dev);
700 struct ucb1x00_dev *udev;
702 if (!ucb->irq_wake && pdata && pdata->reset)
703 pdata->reset(UCB_RST_RESUME);
706 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
707 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
712 raw_spin_lock_irqsave(&ucb->irq_lock, flags);
713 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
715 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
717 raw_spin_unlock_irqrestore(&ucb->irq_lock, flags);
719 disable_irq_wake(ucb->irq);
721 ucb1x00_disable(ucb);
723 mutex_lock(&ucb1x00_mutex);
724 list_for_each_entry(udev, &ucb->devs, dev_node) {
725 if (udev->drv->resume)
726 udev->drv->resume(udev);
728 mutex_unlock(&ucb1x00_mutex);
733 static SIMPLE_DEV_PM_OPS(ucb1x00_pm_ops, ucb1x00_suspend, ucb1x00_resume);
735 static struct mcp_driver ucb1x00_driver = {
738 .owner = THIS_MODULE,
739 .pm = &ucb1x00_pm_ops,
741 .probe = ucb1x00_probe,
742 .remove = ucb1x00_remove,
745 static int __init ucb1x00_init(void)
747 int ret = class_register(&ucb1x00_class);
749 ret = mcp_driver_register(&ucb1x00_driver);
751 class_unregister(&ucb1x00_class);
756 static void __exit ucb1x00_exit(void)
758 mcp_driver_unregister(&ucb1x00_driver);
759 class_unregister(&ucb1x00_class);
762 module_init(ucb1x00_init);
763 module_exit(ucb1x00_exit);
765 EXPORT_SYMBOL(ucb1x00_io_set_dir);
766 EXPORT_SYMBOL(ucb1x00_io_write);
767 EXPORT_SYMBOL(ucb1x00_io_read);
769 EXPORT_SYMBOL(ucb1x00_adc_enable);
770 EXPORT_SYMBOL(ucb1x00_adc_read);
771 EXPORT_SYMBOL(ucb1x00_adc_disable);
773 EXPORT_SYMBOL(ucb1x00_register_driver);
774 EXPORT_SYMBOL(ucb1x00_unregister_driver);
776 MODULE_ALIAS("mcp:ucb1x00");
777 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
778 MODULE_DESCRIPTION("UCB1x00 core driver");
779 MODULE_LICENSE("GPL");