2 * Copyright (C) 2015-2017 Broadcom
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation version 2.
8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9 * kind, whether express or implied; without even the implied warranty
10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/bitops.h>
15 #include <linux/gpio/driver.h>
16 #include <linux/of_device.h>
17 #include <linux/of_irq.h>
18 #include <linux/module.h>
19 #include <linux/irqdomain.h>
20 #include <linux/irqchip/chained_irq.h>
21 #include <linux/interrupt.h>
32 NUMBER_OF_GIO_REGISTERS
35 #define GIO_BANK_SIZE (NUMBER_OF_GIO_REGISTERS * sizeof(u32))
36 #define GIO_BANK_OFF(bank, off) (((bank) * GIO_BANK_SIZE) + (off * sizeof(u32)))
37 #define GIO_ODEN(bank) GIO_BANK_OFF(bank, GIO_REG_ODEN)
38 #define GIO_DATA(bank) GIO_BANK_OFF(bank, GIO_REG_DATA)
39 #define GIO_IODIR(bank) GIO_BANK_OFF(bank, GIO_REG_IODIR)
40 #define GIO_EC(bank) GIO_BANK_OFF(bank, GIO_REG_EC)
41 #define GIO_EI(bank) GIO_BANK_OFF(bank, GIO_REG_EI)
42 #define GIO_MASK(bank) GIO_BANK_OFF(bank, GIO_REG_MASK)
43 #define GIO_LEVEL(bank) GIO_BANK_OFF(bank, GIO_REG_LEVEL)
44 #define GIO_STAT(bank) GIO_BANK_OFF(bank, GIO_REG_STAT)
46 struct brcmstb_gpio_bank {
47 struct list_head node;
50 struct brcmstb_gpio_priv *parent_priv;
53 u32 saved_regs[GIO_REG_STAT]; /* Don't save and restore GIO_REG_STAT */
56 struct brcmstb_gpio_priv {
57 struct list_head bank_list;
58 void __iomem *reg_base;
59 struct platform_device *pdev;
60 struct irq_domain *irq_domain;
61 struct irq_chip irq_chip;
68 #define MAX_GPIO_PER_BANK 32
69 #define GPIO_BANK(gpio) ((gpio) >> 5)
70 /* assumes MAX_GPIO_PER_BANK is a multiple of 2 */
71 #define GPIO_BIT(gpio) ((gpio) & (MAX_GPIO_PER_BANK - 1))
73 static inline struct brcmstb_gpio_priv *
74 brcmstb_gpio_gc_to_priv(struct gpio_chip *gc)
76 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
77 return bank->parent_priv;
81 __brcmstb_gpio_get_active_irqs(struct brcmstb_gpio_bank *bank)
83 void __iomem *reg_base = bank->parent_priv->reg_base;
85 return bank->gc.read_reg(reg_base + GIO_STAT(bank->id)) &
86 bank->gc.read_reg(reg_base + GIO_MASK(bank->id));
90 brcmstb_gpio_get_active_irqs(struct brcmstb_gpio_bank *bank)
95 raw_spin_lock_irqsave(&bank->gc.bgpio_lock, flags);
96 status = __brcmstb_gpio_get_active_irqs(bank);
97 raw_spin_unlock_irqrestore(&bank->gc.bgpio_lock, flags);
102 static int brcmstb_gpio_hwirq_to_offset(irq_hw_number_t hwirq,
103 struct brcmstb_gpio_bank *bank)
105 return hwirq - (bank->gc.base - bank->parent_priv->gpio_base);
108 static void brcmstb_gpio_set_imask(struct brcmstb_gpio_bank *bank,
109 unsigned int hwirq, bool enable)
111 struct gpio_chip *gc = &bank->gc;
112 struct brcmstb_gpio_priv *priv = bank->parent_priv;
113 u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(hwirq, bank));
117 raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
118 imask = gc->read_reg(priv->reg_base + GIO_MASK(bank->id));
123 gc->write_reg(priv->reg_base + GIO_MASK(bank->id), imask);
124 raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
127 static int brcmstb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
129 struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
130 /* gc_offset is relative to this gpio_chip; want real offset */
131 int hwirq = offset + (gc->base - priv->gpio_base);
133 if (hwirq >= priv->num_gpios)
135 return irq_create_mapping(priv->irq_domain, hwirq);
138 /* -------------------- IRQ chip functions -------------------- */
140 static void brcmstb_gpio_irq_mask(struct irq_data *d)
142 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
143 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
145 brcmstb_gpio_set_imask(bank, d->hwirq, false);
148 static void brcmstb_gpio_irq_unmask(struct irq_data *d)
150 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
151 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
153 brcmstb_gpio_set_imask(bank, d->hwirq, true);
156 static void brcmstb_gpio_irq_ack(struct irq_data *d)
158 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
159 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
160 struct brcmstb_gpio_priv *priv = bank->parent_priv;
161 u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank));
163 gc->write_reg(priv->reg_base + GIO_STAT(bank->id), mask);
166 static int brcmstb_gpio_irq_set_type(struct irq_data *d, unsigned int type)
168 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
169 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
170 struct brcmstb_gpio_priv *priv = bank->parent_priv;
171 u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank));
172 u32 edge_insensitive, iedge_insensitive;
173 u32 edge_config, iedge_config;
178 case IRQ_TYPE_LEVEL_LOW:
181 edge_insensitive = 0;
183 case IRQ_TYPE_LEVEL_HIGH:
186 edge_insensitive = 0;
188 case IRQ_TYPE_EDGE_FALLING:
191 edge_insensitive = 0;
193 case IRQ_TYPE_EDGE_RISING:
196 edge_insensitive = 0;
198 case IRQ_TYPE_EDGE_BOTH:
200 edge_config = 0; /* don't care, but want known value */
201 edge_insensitive = mask;
207 raw_spin_lock_irqsave(&bank->gc.bgpio_lock, flags);
209 iedge_config = bank->gc.read_reg(priv->reg_base +
210 GIO_EC(bank->id)) & ~mask;
211 iedge_insensitive = bank->gc.read_reg(priv->reg_base +
212 GIO_EI(bank->id)) & ~mask;
213 ilevel = bank->gc.read_reg(priv->reg_base +
214 GIO_LEVEL(bank->id)) & ~mask;
216 bank->gc.write_reg(priv->reg_base + GIO_EC(bank->id),
217 iedge_config | edge_config);
218 bank->gc.write_reg(priv->reg_base + GIO_EI(bank->id),
219 iedge_insensitive | edge_insensitive);
220 bank->gc.write_reg(priv->reg_base + GIO_LEVEL(bank->id),
223 raw_spin_unlock_irqrestore(&bank->gc.bgpio_lock, flags);
227 static int brcmstb_gpio_priv_set_wake(struct brcmstb_gpio_priv *priv,
233 ret = enable_irq_wake(priv->parent_wake_irq);
235 ret = disable_irq_wake(priv->parent_wake_irq);
237 dev_err(&priv->pdev->dev, "failed to %s wake-up interrupt\n",
238 enable ? "enable" : "disable");
242 static int brcmstb_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
244 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
245 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
246 struct brcmstb_gpio_priv *priv = bank->parent_priv;
247 u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank));
250 * Do not do anything specific for now, suspend/resume callbacks will
251 * configure the interrupt mask appropriately
254 bank->wake_active |= mask;
256 bank->wake_active &= ~mask;
258 return brcmstb_gpio_priv_set_wake(priv, enable);
261 static irqreturn_t brcmstb_gpio_wake_irq_handler(int irq, void *data)
263 struct brcmstb_gpio_priv *priv = data;
265 if (!priv || irq != priv->parent_wake_irq)
272 static void brcmstb_gpio_irq_bank_handler(struct brcmstb_gpio_bank *bank)
274 struct brcmstb_gpio_priv *priv = bank->parent_priv;
275 struct irq_domain *domain = priv->irq_domain;
276 int hwbase = bank->gc.base - priv->gpio_base;
277 unsigned long status;
279 while ((status = brcmstb_gpio_get_active_irqs(bank))) {
282 for_each_set_bit(offset, &status, 32) {
283 if (offset >= bank->width)
284 dev_warn(&priv->pdev->dev,
285 "IRQ for invalid GPIO (bank=%d, offset=%d)\n",
287 generic_handle_domain_irq(domain, hwbase + offset);
292 /* Each UPG GIO block has one IRQ for all banks */
293 static void brcmstb_gpio_irq_handler(struct irq_desc *desc)
295 struct brcmstb_gpio_priv *priv = irq_desc_get_handler_data(desc);
296 struct irq_chip *chip = irq_desc_get_chip(desc);
297 struct brcmstb_gpio_bank *bank;
299 /* Interrupts weren't properly cleared during probe */
300 BUG_ON(!priv || !chip);
302 chained_irq_enter(chip, desc);
303 list_for_each_entry(bank, &priv->bank_list, node)
304 brcmstb_gpio_irq_bank_handler(bank);
305 chained_irq_exit(chip, desc);
308 static struct brcmstb_gpio_bank *brcmstb_gpio_hwirq_to_bank(
309 struct brcmstb_gpio_priv *priv, irq_hw_number_t hwirq)
311 struct brcmstb_gpio_bank *bank;
314 /* banks are in descending order */
315 list_for_each_entry_reverse(bank, &priv->bank_list, node) {
324 * This lock class tells lockdep that GPIO irqs are in a different
325 * category than their parents, so it won't report false recursion.
327 static struct lock_class_key brcmstb_gpio_irq_lock_class;
328 static struct lock_class_key brcmstb_gpio_irq_request_class;
331 static int brcmstb_gpio_irq_map(struct irq_domain *d, unsigned int irq,
332 irq_hw_number_t hwirq)
334 struct brcmstb_gpio_priv *priv = d->host_data;
335 struct brcmstb_gpio_bank *bank =
336 brcmstb_gpio_hwirq_to_bank(priv, hwirq);
337 struct platform_device *pdev = priv->pdev;
343 dev_dbg(&pdev->dev, "Mapping irq %d for gpio line %d (bank %d)\n",
344 irq, (int)hwirq, bank->id);
345 ret = irq_set_chip_data(irq, &bank->gc);
348 irq_set_lockdep_class(irq, &brcmstb_gpio_irq_lock_class,
349 &brcmstb_gpio_irq_request_class);
350 irq_set_chip_and_handler(irq, &priv->irq_chip, handle_level_irq);
351 irq_set_noprobe(irq);
355 static void brcmstb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
357 irq_set_chip_and_handler(irq, NULL, NULL);
358 irq_set_chip_data(irq, NULL);
361 static const struct irq_domain_ops brcmstb_gpio_irq_domain_ops = {
362 .map = brcmstb_gpio_irq_map,
363 .unmap = brcmstb_gpio_irq_unmap,
364 .xlate = irq_domain_xlate_twocell,
367 /* Make sure that the number of banks matches up between properties */
368 static int brcmstb_gpio_sanity_check_banks(struct device *dev,
369 struct device_node *np, struct resource *res)
371 int res_num_banks = resource_size(res) / GIO_BANK_SIZE;
373 of_property_count_u32_elems(np, "brcm,gpio-bank-widths");
375 if (res_num_banks != num_banks) {
376 dev_err(dev, "Mismatch in banks: res had %d, bank-widths had %d\n",
377 res_num_banks, num_banks);
384 static int brcmstb_gpio_remove(struct platform_device *pdev)
386 struct brcmstb_gpio_priv *priv = platform_get_drvdata(pdev);
387 struct brcmstb_gpio_bank *bank;
388 int offset, ret = 0, virq;
391 dev_err(&pdev->dev, "called %s without drvdata!\n", __func__);
395 if (priv->parent_irq > 0)
396 irq_set_chained_handler_and_data(priv->parent_irq, NULL, NULL);
398 /* Remove all IRQ mappings and delete the domain */
399 if (priv->irq_domain) {
400 for (offset = 0; offset < priv->num_gpios; offset++) {
401 virq = irq_find_mapping(priv->irq_domain, offset);
402 irq_dispose_mapping(virq);
404 irq_domain_remove(priv->irq_domain);
408 * You can lose return values below, but we report all errors, and it's
409 * more important to actually perform all of the steps.
411 list_for_each_entry(bank, &priv->bank_list, node)
412 gpiochip_remove(&bank->gc);
417 static int brcmstb_gpio_of_xlate(struct gpio_chip *gc,
418 const struct of_phandle_args *gpiospec, u32 *flags)
420 struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
421 struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
424 if (gc->of_gpio_n_cells != 2) {
429 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
432 offset = gpiospec->args[0] - (gc->base - priv->gpio_base);
433 if (offset >= gc->ngpio || offset < 0)
436 if (unlikely(offset >= bank->width)) {
437 dev_warn_ratelimited(&priv->pdev->dev,
438 "Received request for invalid GPIO offset %d\n",
443 *flags = gpiospec->args[1];
448 /* priv->parent_irq and priv->num_gpios must be set before calling */
449 static int brcmstb_gpio_irq_setup(struct platform_device *pdev,
450 struct brcmstb_gpio_priv *priv)
452 struct device *dev = &pdev->dev;
453 struct device_node *np = dev->of_node;
457 irq_domain_add_linear(np, priv->num_gpios,
458 &brcmstb_gpio_irq_domain_ops,
460 if (!priv->irq_domain) {
461 dev_err(dev, "Couldn't allocate IRQ domain\n");
465 if (of_property_read_bool(np, "wakeup-source")) {
466 priv->parent_wake_irq = platform_get_irq(pdev, 1);
467 if (priv->parent_wake_irq < 0) {
468 priv->parent_wake_irq = 0;
470 "Couldn't get wake IRQ - GPIOs will not be able to wake from sleep");
473 * Set wakeup capability so we can process boot-time
474 * "wakeups" (e.g., from S5 cold boot)
476 device_set_wakeup_capable(dev, true);
477 device_wakeup_enable(dev);
478 err = devm_request_irq(dev, priv->parent_wake_irq,
479 brcmstb_gpio_wake_irq_handler,
481 "brcmstb-gpio-wake", priv);
484 dev_err(dev, "Couldn't request wake IRQ");
485 goto out_free_domain;
490 priv->irq_chip.name = dev_name(dev);
491 priv->irq_chip.irq_disable = brcmstb_gpio_irq_mask;
492 priv->irq_chip.irq_mask = brcmstb_gpio_irq_mask;
493 priv->irq_chip.irq_unmask = brcmstb_gpio_irq_unmask;
494 priv->irq_chip.irq_ack = brcmstb_gpio_irq_ack;
495 priv->irq_chip.irq_set_type = brcmstb_gpio_irq_set_type;
497 if (priv->parent_wake_irq)
498 priv->irq_chip.irq_set_wake = brcmstb_gpio_irq_set_wake;
500 irq_set_chained_handler_and_data(priv->parent_irq,
501 brcmstb_gpio_irq_handler, priv);
502 irq_set_status_flags(priv->parent_irq, IRQ_DISABLE_UNLAZY);
507 irq_domain_remove(priv->irq_domain);
512 static void brcmstb_gpio_bank_save(struct brcmstb_gpio_priv *priv,
513 struct brcmstb_gpio_bank *bank)
515 struct gpio_chip *gc = &bank->gc;
518 for (i = 0; i < GIO_REG_STAT; i++)
519 bank->saved_regs[i] = gc->read_reg(priv->reg_base +
520 GIO_BANK_OFF(bank->id, i));
523 static void brcmstb_gpio_quiesce(struct device *dev, bool save)
525 struct brcmstb_gpio_priv *priv = dev_get_drvdata(dev);
526 struct brcmstb_gpio_bank *bank;
527 struct gpio_chip *gc;
530 /* disable non-wake interrupt */
531 if (priv->parent_irq >= 0)
532 disable_irq(priv->parent_irq);
534 list_for_each_entry(bank, &priv->bank_list, node) {
538 brcmstb_gpio_bank_save(priv, bank);
540 /* Unmask GPIOs which have been flagged as wake-up sources */
541 if (priv->parent_wake_irq)
542 imask = bank->wake_active;
545 gc->write_reg(priv->reg_base + GIO_MASK(bank->id),
550 static void brcmstb_gpio_shutdown(struct platform_device *pdev)
552 /* Enable GPIO for S5 cold boot */
553 brcmstb_gpio_quiesce(&pdev->dev, false);
556 #ifdef CONFIG_PM_SLEEP
557 static void brcmstb_gpio_bank_restore(struct brcmstb_gpio_priv *priv,
558 struct brcmstb_gpio_bank *bank)
560 struct gpio_chip *gc = &bank->gc;
563 for (i = 0; i < GIO_REG_STAT; i++)
564 gc->write_reg(priv->reg_base + GIO_BANK_OFF(bank->id, i),
565 bank->saved_regs[i]);
568 static int brcmstb_gpio_suspend(struct device *dev)
570 brcmstb_gpio_quiesce(dev, true);
574 static int brcmstb_gpio_resume(struct device *dev)
576 struct brcmstb_gpio_priv *priv = dev_get_drvdata(dev);
577 struct brcmstb_gpio_bank *bank;
578 bool need_wakeup_event = false;
580 list_for_each_entry(bank, &priv->bank_list, node) {
581 need_wakeup_event |= !!__brcmstb_gpio_get_active_irqs(bank);
582 brcmstb_gpio_bank_restore(priv, bank);
585 if (priv->parent_wake_irq && need_wakeup_event)
586 pm_wakeup_event(dev, 0);
588 /* enable non-wake interrupt */
589 if (priv->parent_irq >= 0)
590 enable_irq(priv->parent_irq);
596 #define brcmstb_gpio_suspend NULL
597 #define brcmstb_gpio_resume NULL
598 #endif /* CONFIG_PM_SLEEP */
600 static const struct dev_pm_ops brcmstb_gpio_pm_ops = {
601 .suspend_noirq = brcmstb_gpio_suspend,
602 .resume_noirq = brcmstb_gpio_resume,
605 static int brcmstb_gpio_probe(struct platform_device *pdev)
607 struct device *dev = &pdev->dev;
608 struct device_node *np = dev->of_node;
609 void __iomem *reg_base;
610 struct brcmstb_gpio_priv *priv;
611 struct resource *res;
612 struct property *prop;
617 static int gpio_base;
618 unsigned long flags = 0;
619 bool need_wakeup_event = false;
621 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
624 platform_set_drvdata(pdev, priv);
625 INIT_LIST_HEAD(&priv->bank_list);
627 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
628 reg_base = devm_ioremap_resource(dev, res);
629 if (IS_ERR(reg_base))
630 return PTR_ERR(reg_base);
632 priv->gpio_base = gpio_base;
633 priv->reg_base = reg_base;
636 if (of_property_read_bool(np, "interrupt-controller")) {
637 priv->parent_irq = platform_get_irq(pdev, 0);
638 if (priv->parent_irq <= 0)
641 priv->parent_irq = -ENOENT;
644 if (brcmstb_gpio_sanity_check_banks(dev, np, res))
648 * MIPS endianness is configured by boot strap, which also reverses all
649 * bus endianness (i.e., big-endian CPU + big endian bus ==> native
652 * Other architectures (e.g., ARM) either do not support big endian, or
653 * else leave I/O in little endian mode.
655 #if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN)
656 flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
659 of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
661 struct brcmstb_gpio_bank *bank;
662 struct gpio_chip *gc;
665 * If bank_width is 0, then there is an empty bank in the
666 * register block. Special handling for this case.
668 if (bank_width == 0) {
669 dev_dbg(dev, "Width 0 found: Empty bank @ %d\n",
672 gpio_base += MAX_GPIO_PER_BANK;
676 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
682 bank->parent_priv = priv;
683 bank->id = num_banks;
684 if (bank_width <= 0 || bank_width > MAX_GPIO_PER_BANK) {
685 dev_err(dev, "Invalid bank width %d\n", bank_width);
689 bank->width = bank_width;
693 * Regs are 4 bytes wide, have data reg, no set/clear regs,
694 * and direction bits have 0 = output and 1 = input
697 err = bgpio_init(gc, dev, 4,
698 reg_base + GIO_DATA(bank->id),
700 reg_base + GIO_IODIR(bank->id), flags);
702 dev_err(dev, "bgpio_init() failed\n");
706 gc->owner = THIS_MODULE;
707 gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
712 gc->base = gpio_base;
713 gc->of_gpio_n_cells = 2;
714 gc->of_xlate = brcmstb_gpio_of_xlate;
715 /* not all ngpio lines are valid, will use bank width later */
716 gc->ngpio = MAX_GPIO_PER_BANK;
717 gc->offset = bank->id * MAX_GPIO_PER_BANK;
718 if (priv->parent_irq > 0)
719 gc->to_irq = brcmstb_gpio_to_irq;
722 * Mask all interrupts by default, since wakeup interrupts may
723 * be retained from S5 cold boot
725 need_wakeup_event |= !!__brcmstb_gpio_get_active_irqs(bank);
726 gc->write_reg(reg_base + GIO_MASK(bank->id), 0);
728 err = gpiochip_add_data(gc, bank);
730 dev_err(dev, "Could not add gpiochip for bank %d\n",
734 gpio_base += gc->ngpio;
736 dev_dbg(dev, "bank=%d, base=%d, ngpio=%d, width=%d\n", bank->id,
737 gc->base, gc->ngpio, bank->width);
739 /* Everything looks good, so add bank to list */
740 list_add(&bank->node, &priv->bank_list);
745 priv->num_gpios = gpio_base - priv->gpio_base;
746 if (priv->parent_irq > 0) {
747 err = brcmstb_gpio_irq_setup(pdev, priv);
752 if (priv->parent_wake_irq && need_wakeup_event)
753 pm_wakeup_event(dev, 0);
758 (void) brcmstb_gpio_remove(pdev);
762 static const struct of_device_id brcmstb_gpio_of_match[] = {
763 { .compatible = "brcm,brcmstb-gpio" },
767 MODULE_DEVICE_TABLE(of, brcmstb_gpio_of_match);
769 static struct platform_driver brcmstb_gpio_driver = {
771 .name = "brcmstb-gpio",
772 .of_match_table = brcmstb_gpio_of_match,
773 .pm = &brcmstb_gpio_pm_ops,
775 .probe = brcmstb_gpio_probe,
776 .remove = brcmstb_gpio_remove,
777 .shutdown = brcmstb_gpio_shutdown,
779 module_platform_driver(brcmstb_gpio_driver);
781 MODULE_AUTHOR("Gregory Fong");
782 MODULE_DESCRIPTION("Driver for Broadcom BRCMSTB SoC UPG GPIO");
783 MODULE_LICENSE("GPL v2");