[deliverable/linux.git] / drivers / gpio / timbgpio.c

/*
 * timbgpio.c timberdale FPGA GPIO driver
 * Copyright (c) 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * Timberdale FPGA GPIO
 */

#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/timb_gpio.h>
#include <linux/interrupt.h>

#define DRIVER_NAME "timb-gpio"

#define TGPIOVAL	0x00
#define TGPIODIR	0x04
#define TGPIO_IER	0x08
#define TGPIO_ISR	0x0c
#define TGPIO_IPR	0x10
#define TGPIO_ICR	0x14
#define TGPIO_FLR	0x18
#define TGPIO_LVR	0x1c
#define TGPIO_VER	0x20
#define TGPIO_BFLR	0x24

struct timbgpio {
	void __iomem		*membase;
	spinlock_t		lock; /* mutual exclusion */
	struct gpio_chip	gpio;
	int			irq_base;
};

static int timbgpio_update_bit(struct gpio_chip *gpio, unsigned index,
	unsigned offset, bool enabled)
{
	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	u32 reg;

	spin_lock(&tgpio->lock);
	reg = ioread32(tgpio->membase + offset);

	if (enabled)
		reg |= (1 << index);
	else
		reg &= ~(1 << index);

	iowrite32(reg, tgpio->membase + offset);
	spin_unlock(&tgpio->lock);

	return 0;
}

static int timbgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
	return timbgpio_update_bit(gpio, nr, TGPIODIR, true);
}

static int timbgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
{
	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	u32 value;

	value = ioread32(tgpio->membase + TGPIOVAL);
	return (value & (1 << nr)) ? 1 : 0;
}

static int timbgpio_gpio_direction_output(struct gpio_chip *gpio,
						unsigned nr, int val)
{
	return timbgpio_update_bit(gpio, nr, TGPIODIR, false);
}

static void timbgpio_gpio_set(struct gpio_chip *gpio,
				unsigned nr, int val)
{
	timbgpio_update_bit(gpio, nr, TGPIOVAL, val != 0);
}

static int timbgpio_to_irq(struct gpio_chip *gpio, unsigned offset)
{
	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);

	if (tgpio->irq_base <= 0)
		return -EINVAL;

	return tgpio->irq_base + offset;
}

/*
 * GPIO IRQ
 */
static void timbgpio_irq_disable(unsigned irq)
{
	struct timbgpio *tgpio = get_irq_chip_data(irq);
	int offset = irq - tgpio->irq_base;

	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 0);
}

static void timbgpio_irq_enable(unsigned irq)
{
	struct timbgpio *tgpio = get_irq_chip_data(irq);
	int offset = irq - tgpio->irq_base;

	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 1);
}

static int timbgpio_irq_type(unsigned irq, unsigned trigger)
{
	struct timbgpio *tgpio = get_irq_chip_data(irq);
	int offset = irq - tgpio->irq_base;
	unsigned long flags;
	u32 lvr, flr, bflr = 0;
	u32 ver;

	if (offset < 0 || offset > tgpio->gpio.ngpio)
		return -EINVAL;

	ver = ioread32(tgpio->membase + TGPIO_VER);

	spin_lock_irqsave(&tgpio->lock, flags);

	lvr = ioread32(tgpio->membase + TGPIO_LVR);
	flr = ioread32(tgpio->membase + TGPIO_FLR);
	if (ver > 2)
		bflr = ioread32(tgpio->membase + TGPIO_BFLR);

	if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
		bflr &= ~(1 << offset);
		flr &= ~(1 << offset);
		if (trigger & IRQ_TYPE_LEVEL_HIGH)
			lvr |= 1 << offset;
		else
			lvr &= ~(1 << offset);
	}

	if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
		if (ver < 3)
			return -EINVAL;
		else {
			flr |= 1 << offset;
			bflr |= 1 << offset;
		}
	} else {
		bflr &= ~(1 << offset);
		flr |= 1 << offset;
		if (trigger & IRQ_TYPE_EDGE_FALLING)
			lvr &= ~(1 << offset);
		else
			lvr |= 1 << offset;
	}

	iowrite32(lvr, tgpio->membase + TGPIO_LVR);
	iowrite32(flr, tgpio->membase + TGPIO_FLR);
	if (ver > 2)
		iowrite32(bflr, tgpio->membase + TGPIO_BFLR);

	iowrite32(1 << offset, tgpio->membase + TGPIO_ICR);
	spin_unlock_irqrestore(&tgpio->lock, flags);

	return 0;
}

static void timbgpio_irq(unsigned int irq, struct irq_desc *desc)
{
	struct timbgpio *tgpio = get_irq_data(irq);
	unsigned long ipr;
	int offset;

	desc->chip->ack(irq);
	ipr = ioread32(tgpio->membase + TGPIO_IPR);
	iowrite32(ipr, tgpio->membase + TGPIO_ICR);

	for_each_set_bit(offset, &ipr, tgpio->gpio.ngpio)
		generic_handle_irq(timbgpio_to_irq(&tgpio->gpio, offset));
}

static struct irq_chip timbgpio_irqchip = {
	.name		= "GPIO",
	.enable		= timbgpio_irq_enable,
	.disable	= timbgpio_irq_disable,
	.set_type	= timbgpio_irq_type,
};

static int __devinit timbgpio_probe(struct platform_device *pdev)
{
	int err, i;
	struct gpio_chip *gc;
	struct timbgpio *tgpio;
	struct resource *iomem;
	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
	int irq = platform_get_irq(pdev, 0);

	if (!pdata || pdata->nr_pins > 32) {
		err = -EINVAL;
		goto err_mem;
	}

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem) {
		err = -EINVAL;
		goto err_mem;
	}

	tgpio = kzalloc(sizeof(*tgpio), GFP_KERNEL);
	if (!tgpio) {
		err = -EINVAL;
		goto err_mem;
	}
	tgpio->irq_base = pdata->irq_base;

	spin_lock_init(&tgpio->lock);

	if (!request_mem_region(iomem->start, resource_size(iomem),
		DRIVER_NAME)) {
		err = -EBUSY;
		goto err_request;
	}

	tgpio->membase = ioremap(iomem->start, resource_size(iomem));
	if (!tgpio->membase) {
		err = -ENOMEM;
		goto err_ioremap;
	}

	gc = &tgpio->gpio;

	gc->label = dev_name(&pdev->dev);
	gc->owner = THIS_MODULE;
	gc->dev = &pdev->dev;
	gc->direction_input = timbgpio_gpio_direction_input;
	gc->get = timbgpio_gpio_get;
	gc->direction_output = timbgpio_gpio_direction_output;
	gc->set = timbgpio_gpio_set;
	gc->to_irq = (irq >= 0 && tgpio->irq_base > 0) ? timbgpio_to_irq : NULL;
	gc->dbg_show = NULL;
	gc->base = pdata->gpio_base;
	gc->ngpio = pdata->nr_pins;
	gc->can_sleep = 0;

	err = gpiochip_add(gc);
	if (err)
		goto err_chipadd;

	platform_set_drvdata(pdev, tgpio);

	/* make sure to disable interrupts */
	iowrite32(0x0, tgpio->membase + TGPIO_IER);

	if (irq < 0 || tgpio->irq_base <= 0)
		return 0;

	for (i = 0; i < pdata->nr_pins; i++) {
		set_irq_chip_and_handler_name(tgpio->irq_base + i,
			&timbgpio_irqchip, handle_simple_irq, "mux");
		set_irq_chip_data(tgpio->irq_base + i, tgpio);
#ifdef CONFIG_ARM
		set_irq_flags(tgpio->irq_base + i, IRQF_VALID | IRQF_PROBE);
#endif
	}

	set_irq_data(irq, tgpio);
	set_irq_chained_handler(irq, timbgpio_irq);

	return 0;

err_chipadd:
	iounmap(tgpio->membase);
err_ioremap:
	release_mem_region(iomem->start, resource_size(iomem));
err_request:
	kfree(tgpio);
err_mem:
	printk(KERN_ERR DRIVER_NAME": Failed to register GPIOs: %d\n", err);

	return err;
}

static int __devexit timbgpio_remove(struct platform_device *pdev)
{
	int err;
	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
	struct timbgpio *tgpio = platform_get_drvdata(pdev);
	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	int irq = platform_get_irq(pdev, 0);

	if (irq >= 0 && tgpio->irq_base > 0) {
		int i;
		for (i = 0; i < pdata->nr_pins; i++) {
			set_irq_chip(tgpio->irq_base + i, NULL);
			set_irq_chip_data(tgpio->irq_base + i, NULL);
		}

		set_irq_handler(irq, NULL);
		set_irq_data(irq, NULL);
	}

	err = gpiochip_remove(&tgpio->gpio);
	if (err)
		printk(KERN_ERR DRIVER_NAME": failed to remove gpio_chip\n");

	iounmap(tgpio->membase);
	release_mem_region(iomem->start, resource_size(iomem));
	kfree(tgpio);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver timbgpio_platform_driver = {
	.driver = {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= timbgpio_probe,
	.remove		= timbgpio_remove,
};

/*--------------------------------------------------------------------------*/

static int __init timbgpio_init(void)
{
	return platform_driver_register(&timbgpio_platform_driver);
}

static void __exit timbgpio_exit(void)
{
	platform_driver_unregister(&timbgpio_platform_driver);
}

module_init(timbgpio_init);
module_exit(timbgpio_exit);

MODULE_DESCRIPTION("Timberdale GPIO driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Mocean Laboratories");
MODULE_ALIAS("platform:"DRIVER_NAME);
Commit	Line	Data
35570ac6 RR	1	/*
	2	* timbgpio.c timberdale FPGA GPIO driver
	3	* Copyright (c) 2009 Intel Corporation
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
	19	/* Supports:
	20	* Timberdale FPGA GPIO
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/gpio.h>
	25	#include <linux/platform_device.h>
e3cb91ce	26	#include <linux/irq.h>
35570ac6 RR	27	#include <linux/io.h>
	28	#include <linux/timb_gpio.h>
	29	#include <linux/interrupt.h>
	30
	31	#define DRIVER_NAME "timb-gpio"
	32
	33	#define TGPIOVAL 0x00
	34	#define TGPIODIR 0x04
	35	#define TGPIO_IER 0x08
	36	#define TGPIO_ISR 0x0c
	37	#define TGPIO_IPR 0x10
	38	#define TGPIO_ICR 0x14
	39	#define TGPIO_FLR 0x18
	40	#define TGPIO_LVR 0x1c
8c35c89a RR	41	#define TGPIO_VER 0x20
8c35c89a RR	42	#define TGPIO_BFLR 0x24
35570ac6 RR	43
	44	struct timbgpio {
	45	void __iomem *membase;
	46	spinlock_t lock; /* mutual exclusion */
	47	struct gpio_chip gpio;
	48	int irq_base;
	49	};
	50
	51	static int timbgpio_update_bit(struct gpio_chip *gpio, unsigned index,
	52	unsigned offset, bool enabled)
	53	{
	54	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	55	u32 reg;
	56
	57	spin_lock(&tgpio->lock);
	58	reg = ioread32(tgpio->membase + offset);
	59
	60	if (enabled)
	61	reg \|= (1 << index);
	62	else
	63	reg &= ~(1 << index);
	64
	65	iowrite32(reg, tgpio->membase + offset);
	66	spin_unlock(&tgpio->lock);
	67
	68	return 0;
	69	}
	70
	71	static int timbgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
	72	{
	73	return timbgpio_update_bit(gpio, nr, TGPIODIR, true);
	74	}
	75
	76	static int timbgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
	77	{
	78	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	79	u32 value;
	80
	81	value = ioread32(tgpio->membase + TGPIOVAL);
	82	return (value & (1 << nr)) ? 1 : 0;
	83	}
	84
	85	static int timbgpio_gpio_direction_output(struct gpio_chip *gpio,
	86	unsigned nr, int val)
	87	{
	88	return timbgpio_update_bit(gpio, nr, TGPIODIR, false);
	89	}
	90
	91	static void timbgpio_gpio_set(struct gpio_chip *gpio,
	92	unsigned nr, int val)
	93	{
	94	timbgpio_update_bit(gpio, nr, TGPIOVAL, val != 0);
	95	}
	96
	97	static int timbgpio_to_irq(struct gpio_chip *gpio, unsigned offset)
	98	{
	99	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	100
	101	if (tgpio->irq_base <= 0)
	102	return -EINVAL;
	103
	104	return tgpio->irq_base + offset;
	105	}
	106
107	/*
108	* GPIO IRQ
109	*/
110	static void timbgpio_irq_disable(unsigned irq)
111	{
112	struct timbgpio *tgpio = get_irq_chip_data(irq);
113	int offset = irq - tgpio->irq_base;
114
115	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 0);
116	}
117
118	static void timbgpio_irq_enable(unsigned irq)
119	{
120	struct timbgpio *tgpio = get_irq_chip_data(irq);
121	int offset = irq - tgpio->irq_base;
122
123	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 1);
124	}
125
126	static int timbgpio_irq_type(unsigned irq, unsigned trigger)
127	{
128	struct timbgpio *tgpio = get_irq_chip_data(irq);
129	int offset = irq - tgpio->irq_base;
130	unsigned long flags;
8c35c89a RR	131	u32 lvr, flr, bflr = 0;
8c35c89a RR	132	u32 ver;
35570ac6 RR	133
	134	if (offset < 0 \|\| offset > tgpio->gpio.ngpio)
	135	return -EINVAL;
	136
8c35c89a RR	137	ver = ioread32(tgpio->membase + TGPIO_VER);
8c35c89a RR	138
35570ac6 RR	139	spin_lock_irqsave(&tgpio->lock, flags);
	140
	141	lvr = ioread32(tgpio->membase + TGPIO_LVR);
	142	flr = ioread32(tgpio->membase + TGPIO_FLR);
8c35c89a RR	143	if (ver > 2)
8c35c89a RR	144	bflr = ioread32(tgpio->membase + TGPIO_BFLR);
35570ac6 RR	145
35570ac6 RR	146	if (trigger & (IRQ_TYPE_LEVEL_HIGH \| IRQ_TYPE_LEVEL_LOW)) {
8c35c89a	147	bflr &= ~(1 << offset);
35570ac6 RR	148	flr &= ~(1 << offset);
	149	if (trigger & IRQ_TYPE_LEVEL_HIGH)
	150	lvr \|= 1 << offset;
	151	else
	152	lvr &= ~(1 << offset);
	153	}
	154
8c35c89a RR	155	if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
	156	if (ver < 3)
	157	return -EINVAL;
	158	else {
	159	flr \|= 1 << offset;
	160	bflr \|= 1 << offset;
	161	}
	162	} else {
	163	bflr &= ~(1 << offset);
35570ac6	164	flr \|= 1 << offset;
35570ac6	165	if (trigger & IRQ_TYPE_EDGE_FALLING)
35570ac6	166	lvr &= ~(1 << offset);
8c35c89a RR	167	else
8c35c89a RR	168	lvr \|= 1 << offset;
35570ac6 RR	169	}
	170
	171	iowrite32(lvr, tgpio->membase + TGPIO_LVR);
	172	iowrite32(flr, tgpio->membase + TGPIO_FLR);
8c35c89a RR	173	if (ver > 2)
	174	iowrite32(bflr, tgpio->membase + TGPIO_BFLR);
	175
35570ac6 RR	176	iowrite32(1 << offset, tgpio->membase + TGPIO_ICR);
	177	spin_unlock_irqrestore(&tgpio->lock, flags);
	178
	179	return 0;
	180	}
	181
	182	static void timbgpio_irq(unsigned int irq, struct irq_desc *desc)
	183	{
	184	struct timbgpio *tgpio = get_irq_data(irq);
	185	unsigned long ipr;
	186	int offset;
	187
	188	desc->chip->ack(irq);
	189	ipr = ioread32(tgpio->membase + TGPIO_IPR);
	190	iowrite32(ipr, tgpio->membase + TGPIO_ICR);
	191
984b3f57	192	for_each_set_bit(offset, &ipr, tgpio->gpio.ngpio)
35570ac6 RR	193	generic_handle_irq(timbgpio_to_irq(&tgpio->gpio, offset));
	194	}
	195
	196	static struct irq_chip timbgpio_irqchip = {
	197	.name = "GPIO",
	198	.enable = timbgpio_irq_enable,
	199	.disable = timbgpio_irq_disable,
	200	.set_type = timbgpio_irq_type,
	201	};
	202
	203	static int __devinit timbgpio_probe(struct platform_device *pdev)
	204	{
	205	int err, i;
	206	struct gpio_chip *gc;
	207	struct timbgpio *tgpio;
	208	struct resource *iomem;
	209	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
	210	int irq = platform_get_irq(pdev, 0);
	211
	212	if (!pdata \|\| pdata->nr_pins > 32) {
	213	err = -EINVAL;
	214	goto err_mem;
	215	}
	216
	217	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	218	if (!iomem) {
	219	err = -EINVAL;
	220	goto err_mem;
	221	}
	222
	223	tgpio = kzalloc(sizeof(*tgpio), GFP_KERNEL);
	224	if (!tgpio) {
	225	err = -EINVAL;
	226	goto err_mem;
	227	}
	228	tgpio->irq_base = pdata->irq_base;
	229
	230	spin_lock_init(&tgpio->lock);
	231
	232	if (!request_mem_region(iomem->start, resource_size(iomem),
	233	DRIVER_NAME)) {
	234	err = -EBUSY;
	235	goto err_request;
	236	}
	237
	238	tgpio->membase = ioremap(iomem->start, resource_size(iomem));
	239	if (!tgpio->membase) {
	240	err = -ENOMEM;
	241	goto err_ioremap;
	242	}
	243
	244	gc = &tgpio->gpio;
	245
	246	gc->label = dev_name(&pdev->dev);
	247	gc->owner = THIS_MODULE;
	248	gc->dev = &pdev->dev;
	249	gc->direction_input = timbgpio_gpio_direction_input;
	250	gc->get = timbgpio_gpio_get;
	251	gc->direction_output = timbgpio_gpio_direction_output;
	252	gc->set = timbgpio_gpio_set;
	253	gc->to_irq = (irq >= 0 && tgpio->irq_base > 0) ? timbgpio_to_irq : NULL;
	254	gc->dbg_show = NULL;
	255	gc->base = pdata->gpio_base;
	256	gc->ngpio = pdata->nr_pins;
257	gc->can_sleep = 0;
258
259	err = gpiochip_add(gc);
260	if (err)
261	goto err_chipadd;
262
263	platform_set_drvdata(pdev, tgpio);
264
265	/* make sure to disable interrupts */
266	iowrite32(0x0, tgpio->membase + TGPIO_IER);
267
268	if (irq < 0 \|\| tgpio->irq_base <= 0)
269	return 0;
270
271	for (i = 0; i < pdata->nr_pins; i++) {
272	set_irq_chip_and_handler_name(tgpio->irq_base + i,
273	&timbgpio_irqchip, handle_simple_irq, "mux");
274	set_irq_chip_data(tgpio->irq_base + i, tgpio);
275	#ifdef CONFIG_ARM
276	set_irq_flags(tgpio->irq_base + i, IRQF_VALID \| IRQF_PROBE);
277	#endif
278	}
279
280	set_irq_data(irq, tgpio);
281	set_irq_chained_handler(irq, timbgpio_irq);
282
283	return 0;
284
285	err_chipadd:
286	iounmap(tgpio->membase);
287	err_ioremap:
288	release_mem_region(iomem->start, resource_size(iomem));
289	err_request:
290	kfree(tgpio);
291	err_mem:
292	printk(KERN_ERR DRIVER_NAME": Failed to register GPIOs: %d\n", err);
293
294	return err;
295	}
296
297	static int __devexit timbgpio_remove(struct platform_device *pdev)
298	{
299	int err;
300	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
301	struct timbgpio *tgpio = platform_get_drvdata(pdev);
302	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
303	int irq = platform_get_irq(pdev, 0);
304
305	if (irq >= 0 && tgpio->irq_base > 0) {
306	int i;
307	for (i = 0; i < pdata->nr_pins; i++) {
308	set_irq_chip(tgpio->irq_base + i, NULL);
309	set_irq_chip_data(tgpio->irq_base + i, NULL);
310	}
311
312	set_irq_handler(irq, NULL);
313	set_irq_data(irq, NULL);
314	}
315
316	err = gpiochip_remove(&tgpio->gpio);
317	if (err)
318	printk(KERN_ERR DRIVER_NAME": failed to remove gpio_chip\n");
319
320	iounmap(tgpio->membase);
321	release_mem_region(iomem->start, resource_size(iomem));
322	kfree(tgpio);
323
324	platform_set_drvdata(pdev, NULL);
325
326	return 0;
327	}
328
329	static struct platform_driver timbgpio_platform_driver = {
330	.driver = {
331	.name = DRIVER_NAME,
332	.owner = THIS_MODULE,
333	},
334	.probe = timbgpio_probe,
335	.remove = timbgpio_remove,
336	};
337
338	/--------------------------------------------------------------------------/
339
340	static int __init timbgpio_init(void)
341	{
342	return platform_driver_register(&timbgpio_platform_driver);
343	}
344
345	static void __exit timbgpio_exit(void)
346	{
347	platform_driver_unregister(&timbgpio_platform_driver);
348	}
349
350	module_init(timbgpio_init);
351	module_exit(timbgpio_exit);
352
353	MODULE_DESCRIPTION("Timberdale GPIO driver");
354	MODULE_LICENSE("GPL v2");
355	MODULE_AUTHOR("Mocean Laboratories");
356	MODULE_ALIAS("platform:"DRIVER_NAME);
357