[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpio / langwell_gpio.c

/* langwell_gpio.c Moorestown platform Langwell chip GPIO driver
 * Copyright (c) 2008 - 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:
 * Moorestown platform Langwell chip.
 * Medfield platform Penwell chip.
 * Whitney point.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/slab.h>

/*
 * Langwell chip has 64 pins and thus there are 2 32bit registers to control
 * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
 * registers to control them, so we only define the order here instead of a
 * structure, to get a bit offset for a pin (use GPDR as an example):
 *
 * nreg = ngpio / 32;
 * reg = offset / 32;
 * bit = offset % 32;
 * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
 *
 * so the bit of reg_addr is to control pin offset's GPDR feature
*/

enum GPIO_REG {
	GPLR = 0,	/* pin level read-only */
	GPDR,		/* pin direction */
	GPSR,		/* pin set */
	GPCR,		/* pin clear */
	GRER,		/* rising edge detect */
	GFER,		/* falling edge detect */
	GEDR,		/* edge detect result */
};

struct lnw_gpio {
	struct gpio_chip		chip;
	void				*reg_base;
	spinlock_t			lock;
	unsigned			irq_base;
};

static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
			enum GPIO_REG reg_type)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	unsigned nreg = chip->ngpio / 32;
	u8 reg = offset / 32;
	void __iomem *ptr;

	ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg * 4);
	return ptr;
}

static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	void __iomem *gplr = gpio_reg(chip, offset, GPLR);

	return readl(gplr) & BIT(offset % 32);
}

static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	void __iomem *gpsr, *gpcr;

	if (value) {
		gpsr = gpio_reg(chip, offset, GPSR);
		writel(BIT(offset % 32), gpsr);
	} else {
		gpcr = gpio_reg(chip, offset, GPCR);
		writel(BIT(offset % 32), gpcr);
	}
}

static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	u32 value;
	unsigned long flags;

	spin_lock_irqsave(&lnw->lock, flags);
	value = readl(gpdr);
	value &= ~BIT(offset % 32);
	writel(value, gpdr);
	spin_unlock_irqrestore(&lnw->lock, flags);
	return 0;
}

static int lnw_gpio_direction_output(struct gpio_chip *chip,
			unsigned offset, int value)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	unsigned long flags;

	lnw_gpio_set(chip, offset, value);
	spin_lock_irqsave(&lnw->lock, flags);
	value = readl(gpdr);
	value |= BIT(offset % 32);;
	writel(value, gpdr);
	spin_unlock_irqrestore(&lnw->lock, flags);
	return 0;
}

static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	return lnw->irq_base + offset;
}

static int lnw_irq_type(struct irq_data *d, unsigned type)
{
	struct lnw_gpio *lnw = irq_data_get_irq_chip_data(d);
	u32 gpio = d->irq - lnw->irq_base;
	unsigned long flags;
	u32 value;
	void __iomem *grer = gpio_reg(&lnw->chip, gpio, GRER);
	void __iomem *gfer = gpio_reg(&lnw->chip, gpio, GFER);

	if (gpio >= lnw->chip.ngpio)
		return -EINVAL;
	spin_lock_irqsave(&lnw->lock, flags);
	if (type & IRQ_TYPE_EDGE_RISING)
		value = readl(grer) | BIT(gpio % 32);
	else
		value = readl(grer) & (~BIT(gpio % 32));
	writel(value, grer);

	if (type & IRQ_TYPE_EDGE_FALLING)
		value = readl(gfer) | BIT(gpio % 32);
	else
		value = readl(gfer) & (~BIT(gpio % 32));
	writel(value, gfer);
	spin_unlock_irqrestore(&lnw->lock, flags);

	return 0;
}

static void lnw_irq_unmask(struct irq_data *d)
{
}

static void lnw_irq_mask(struct irq_data *d)
{
}

static struct irq_chip lnw_irqchip = {
	.name		= "LNW-GPIO",
	.irq_mask	= lnw_irq_mask,
	.irq_unmask	= lnw_irq_unmask,
	.irq_set_type	= lnw_irq_type,
};

static DEFINE_PCI_DEVICE_TABLE(lnw_gpio_ids) = {   /* pin number */
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f), .driver_data = 64 },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f), .driver_data = 96 },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a), .driver_data = 96 },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, lnw_gpio_ids);

static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
{
	struct irq_data *data = irq_desc_get_irq_data(desc);
	struct lnw_gpio *lnw = irq_data_get_irq_handler_data(data);
	struct irq_chip *chip = irq_data_get_irq_chip(data);
	u32 base, gpio, gedr_v;
	unsigned long pending;
	void __iomem *gedr;

	/* check GPIO controller to check which pin triggered the interrupt */
	for (base = 0; base < lnw->chip.ngpio; base += 32) {
		gedr = gpio_reg(&lnw->chip, base, GEDR);
		gedr_v = pending = readl(gedr);
		if (!gedr_v)
			continue;
		while (pending) {
			gpio = __ffs(pending) - 1;
			pending &= ~BIT(gpio);
			generic_handle_irq(lnw->irq_base + base + gpio);
		}
		/* clear the edge detect status bit */
		writel(gedr_v, gedr);
	}

	chip->irq_eoi(data);
}

static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
			const struct pci_device_id *id)
{
	void *base;
	int i;
	resource_size_t start, len;
	struct lnw_gpio *lnw;
	u32 irq_base;
	u32 gpio_base;
	int retval = 0;

	retval = pci_enable_device(pdev);
	if (retval)
		goto done;

	retval = pci_request_regions(pdev, "langwell_gpio");
	if (retval) {
		dev_err(&pdev->dev, "error requesting resources\n");
		goto err2;
	}
	/* get the irq_base from bar1 */
	start = pci_resource_start(pdev, 1);
	len = pci_resource_len(pdev, 1);
	base = ioremap_nocache(start, len);
	if (!base) {
		dev_err(&pdev->dev, "error mapping bar1\n");
		goto err3;
	}
	irq_base = *(u32 *)base;
	gpio_base = *((u32 *)base + 1);
	/* release the IO mapping, since we already get the info from bar1 */
	iounmap(base);
	/* get the register base from bar0 */
	start = pci_resource_start(pdev, 0);
	len = pci_resource_len(pdev, 0);
	base = ioremap_nocache(start, len);
	if (!base) {
		dev_err(&pdev->dev, "error mapping bar0\n");
		retval = -EFAULT;
		goto err3;
	}

	lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
	if (!lnw) {
		dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n");
		retval = -ENOMEM;
		goto err4;
	}
	lnw->reg_base = base;
	lnw->irq_base = irq_base;
	lnw->chip.label = dev_name(&pdev->dev);
	lnw->chip.direction_input = lnw_gpio_direction_input;
	lnw->chip.direction_output = lnw_gpio_direction_output;
	lnw->chip.get = lnw_gpio_get;
	lnw->chip.set = lnw_gpio_set;
	lnw->chip.to_irq = lnw_gpio_to_irq;
	lnw->chip.base = gpio_base;
	lnw->chip.ngpio = id->driver_data;
	lnw->chip.can_sleep = 0;
	pci_set_drvdata(pdev, lnw);
	retval = gpiochip_add(&lnw->chip);
	if (retval) {
		dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval);
		goto err5;
	}
	irq_set_handler_data(pdev->irq, lnw);
	irq_set_chained_handler(pdev->irq, lnw_irq_handler);
	for (i = 0; i < lnw->chip.ngpio; i++) {
		irq_set_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip,
					      handle_simple_irq, "demux");
		irq_set_chip_data(i + lnw->irq_base, lnw);
	}

	spin_lock_init(&lnw->lock);
	goto done;
err5:
	kfree(lnw);
err4:
	iounmap(base);
err3:
	pci_release_regions(pdev);
err2:
	pci_disable_device(pdev);
done:
	return retval;
}

static struct pci_driver lnw_gpio_driver = {
	.name		= "langwell_gpio",
	.id_table	= lnw_gpio_ids,
	.probe		= lnw_gpio_probe,
};


static int __devinit wp_gpio_probe(struct platform_device *pdev)
{
	struct lnw_gpio *lnw;
	struct gpio_chip *gc;
	struct resource *rc;
	int retval = 0;

	rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!rc)
		return -EINVAL;

	lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
	if (!lnw) {
		dev_err(&pdev->dev,
			"can't allocate whitneypoint_gpio chip data\n");
		return -ENOMEM;
	}
	lnw->reg_base = ioremap_nocache(rc->start, resource_size(rc));
	if (lnw->reg_base == NULL) {
		retval = -EINVAL;
		goto err_kmalloc;
	}
	spin_lock_init(&lnw->lock);
	gc = &lnw->chip;
	gc->label = dev_name(&pdev->dev);
	gc->owner = THIS_MODULE;
	gc->direction_input = lnw_gpio_direction_input;
	gc->direction_output = lnw_gpio_direction_output;
	gc->get = lnw_gpio_get;
	gc->set = lnw_gpio_set;
	gc->to_irq = NULL;
	gc->base = 0;
	gc->ngpio = 64;
	gc->can_sleep = 0;
	retval = gpiochip_add(gc);
	if (retval) {
		dev_err(&pdev->dev, "whitneypoint gpiochip_add error %d\n",
								retval);
		goto err_ioremap;
	}
	platform_set_drvdata(pdev, lnw);
	return 0;
err_ioremap:
	iounmap(lnw->reg_base);
err_kmalloc:
	kfree(lnw);
	return retval;
}

static int __devexit wp_gpio_remove(struct platform_device *pdev)
{
	struct lnw_gpio *lnw = platform_get_drvdata(pdev);
	int err;
	err = gpiochip_remove(&lnw->chip);
	if (err)
		dev_err(&pdev->dev, "failed to remove gpio_chip.\n");
	iounmap(lnw->reg_base);
	kfree(lnw);
	platform_set_drvdata(pdev, NULL);
	return 0;
}

static struct platform_driver wp_gpio_driver = {
	.probe		= wp_gpio_probe,
	.remove		= __devexit_p(wp_gpio_remove),
	.driver		= {
		.name	= "wp_gpio",
		.owner	= THIS_MODULE,
	},
};

static int __init lnw_gpio_init(void)
{
	int ret;
	ret =  pci_register_driver(&lnw_gpio_driver);
	if (ret < 0)
		return ret;
	ret = platform_driver_register(&wp_gpio_driver);
	if (ret < 0)
		pci_unregister_driver(&lnw_gpio_driver);
	return ret;
}

device_initcall(lnw_gpio_init);
Commit	Line	Data
8bf02617 AD	1	/* langwell_gpio.c Moorestown platform Langwell chip GPIO driver
	2	* Copyright (c) 2008 - 2009, Intel Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	16	*/
	17
	18	/* Supports:
	19	* Moorestown platform Langwell chip.
8081c84c	20	* Medfield platform Penwell chip.
72b4379e	21	* Whitney point.
8bf02617 AD	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/pci.h>
72b4379e	26	#include <linux/platform_device.h>
8bf02617 AD	27	#include <linux/kernel.h>
	28	#include <linux/delay.h>
	29	#include <linux/stddef.h>
	30	#include <linux/interrupt.h>
	31	#include <linux/init.h>
	32	#include <linux/irq.h>
	33	#include <linux/io.h>
	34	#include <linux/gpio.h>
5a0e3ad6	35	#include <linux/slab.h>
8bf02617	36
8081c84c AD	37	/*
	38	* Langwell chip has 64 pins and thus there are 2 32bit registers to control
	39	* each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
	40	* registers to control them, so we only define the order here instead of a
	41	* structure, to get a bit offset for a pin (use GPDR as an example):
	42	*
	43	* nreg = ngpio / 32;
	44	* reg = offset / 32;
	45	* bit = offset % 32;
	46	* reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
	47	*
	48	* so the bit of reg_addr is to control pin offset's GPDR feature
	49	*/
	50
	51	enum GPIO_REG {
	52	GPLR = 0, /* pin level read-only */
	53	GPDR, /* pin direction */
	54	GPSR, /* pin set */
	55	GPCR, /* pin clear */
	56	GRER, /* rising edge detect */
	57	GFER, /* falling edge detect */
	58	GEDR, /* edge detect result */
8bf02617 AD	59	};
	60
	61	struct lnw_gpio {
	62	struct gpio_chip chip;
8081c84c	63	void *reg_base;
8bf02617 AD	64	spinlock_t lock;
	65	unsigned irq_base;
	66	};
	67
8081c84c AD	68	static void __iomem gpio_reg(struct gpio_chip chip, unsigned offset,
8081c84c AD	69	enum GPIO_REG reg_type)
8bf02617 AD	70	{
8bf02617 AD	71	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
8081c84c	72	unsigned nreg = chip->ngpio / 32;
8bf02617	73	u8 reg = offset / 32;
8081c84c AD	74	void __iomem *ptr;
	75
	76	ptr = (void __iomem )(lnw->reg_base + reg_type nreg * 4 + reg * 4);
	77	return ptr;
	78	}
	79
	80	static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset)
	81	{
	82	void __iomem *gplr = gpio_reg(chip, offset, GPLR);
8bf02617	83
8bf02617 AD	84	return readl(gplr) & BIT(offset % 32);
	85	}
	86
	87	static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	88	{
8bf02617 AD	89	void __iomem gpsr, gpcr;
	90
	91	if (value) {
8081c84c	92	gpsr = gpio_reg(chip, offset, GPSR);
8bf02617 AD	93	writel(BIT(offset % 32), gpsr);
8bf02617 AD	94	} else {
8081c84c	95	gpcr = gpio_reg(chip, offset, GPCR);
8bf02617 AD	96	writel(BIT(offset % 32), gpcr);
	97	}
	98	}
	99
	100	static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
	101	{
	102	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
8081c84c	103	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
8bf02617 AD	104	u32 value;
8bf02617 AD	105	unsigned long flags;
8bf02617	106
8bf02617 AD	107	spin_lock_irqsave(&lnw->lock, flags);
	108	value = readl(gpdr);
	109	value &= ~BIT(offset % 32);
	110	writel(value, gpdr);
	111	spin_unlock_irqrestore(&lnw->lock, flags);
	112	return 0;
	113	}
	114
	115	static int lnw_gpio_direction_output(struct gpio_chip *chip,
	116	unsigned offset, int value)
	117	{
	118	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
8081c84c	119	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
8bf02617	120	unsigned long flags;
8bf02617 AD	121
8bf02617 AD	122	lnw_gpio_set(chip, offset, value);
8bf02617 AD	123	spin_lock_irqsave(&lnw->lock, flags);
	124	value = readl(gpdr);
	125	value \|= BIT(offset % 32);;
	126	writel(value, gpdr);
	127	spin_unlock_irqrestore(&lnw->lock, flags);
	128	return 0;
	129	}
	130
	131	static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	132	{
	133	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	134	return lnw->irq_base + offset;
	135	}
	136
5ffd72c6	137	static int lnw_irq_type(struct irq_data *d, unsigned type)
8bf02617	138	{
5ffd72c6 LB	139	struct lnw_gpio *lnw = irq_data_get_irq_chip_data(d);
5ffd72c6 LB	140	u32 gpio = d->irq - lnw->irq_base;
8bf02617 AD	141	unsigned long flags;
8bf02617 AD	142	u32 value;
8081c84c AD	143	void __iomem *grer = gpio_reg(&lnw->chip, gpio, GRER);
8081c84c AD	144	void __iomem *gfer = gpio_reg(&lnw->chip, gpio, GFER);
8bf02617	145
4efec627	146	if (gpio >= lnw->chip.ngpio)
8bf02617 AD	147	return -EINVAL;
	148	spin_lock_irqsave(&lnw->lock, flags);
	149	if (type & IRQ_TYPE_EDGE_RISING)
	150	value = readl(grer) \| BIT(gpio % 32);
	151	else
	152	value = readl(grer) & (~BIT(gpio % 32));
	153	writel(value, grer);
	154
	155	if (type & IRQ_TYPE_EDGE_FALLING)
	156	value = readl(gfer) \| BIT(gpio % 32);
	157	else
	158	value = readl(gfer) & (~BIT(gpio % 32));
	159	writel(value, gfer);
	160	spin_unlock_irqrestore(&lnw->lock, flags);
	161
	162	return 0;
fd0574cb	163	}
8bf02617	164
5ffd72c6	165	static void lnw_irq_unmask(struct irq_data *d)
8bf02617	166	{
fd0574cb	167	}
8bf02617	168
5ffd72c6	169	static void lnw_irq_mask(struct irq_data *d)
8bf02617	170	{
fd0574cb	171	}
8bf02617 AD	172
	173	static struct irq_chip lnw_irqchip = {
	174	.name = "LNW-GPIO",
5ffd72c6 LB	175	.irq_mask = lnw_irq_mask,
	176	.irq_unmask = lnw_irq_unmask,
	177	.irq_set_type = lnw_irq_type,
8bf02617 AD	178	};
8bf02617 AD	179
8081c84c AD	180	static DEFINE_PCI_DEVICE_TABLE(lnw_gpio_ids) = { /* pin number */
	181	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f), .driver_data = 64 },
	182	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f), .driver_data = 96 },
	183	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a), .driver_data = 96 },
8bf02617 AD	184	{ 0, }
	185	};
	186	MODULE_DEVICE_TABLE(pci, lnw_gpio_ids);
	187
	188	static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
	189	{
20e2aa91 TG	190	struct irq_data *data = irq_desc_get_irq_data(desc);
	191	struct lnw_gpio *lnw = irq_data_get_irq_handler_data(data);
	192	struct irq_chip *chip = irq_data_get_irq_chip(data);
	193	u32 base, gpio, gedr_v;
732063b9	194	unsigned long pending;
8bf02617	195	void __iomem *gedr;
8bf02617 AD	196
8bf02617 AD	197	/* check GPIO controller to check which pin triggered the interrupt */
8081c84c AD	198	for (base = 0; base < lnw->chip.ngpio; base += 32) {
8081c84c AD	199	gedr = gpio_reg(&lnw->chip, base, GEDR);
732063b9	200	gedr_v = pending = readl(gedr);
8bf02617 AD	201	if (!gedr_v)
8bf02617 AD	202	continue;
732063b9 TG	203	while (pending) {
	204	gpio = __ffs(pending) - 1;
	205	pending &= ~BIT(gpio);
	206	generic_handle_irq(lnw->irq_base + base + gpio);
	207	}
8bf02617 AD	208	/* clear the edge detect status bit */
	209	writel(gedr_v, gedr);
	210	}
0766d20f	211
20e2aa91	212	chip->irq_eoi(data);
8bf02617 AD	213	}
	214
	215	static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
	216	const struct pci_device_id *id)
	217	{
	218	void *base;
	219	int i;
	220	resource_size_t start, len;
	221	struct lnw_gpio *lnw;
	222	u32 irq_base;
	223	u32 gpio_base;
	224	int retval = 0;
	225
	226	retval = pci_enable_device(pdev);
	227	if (retval)
	228	goto done;
	229
	230	retval = pci_request_regions(pdev, "langwell_gpio");
	231	if (retval) {
	232	dev_err(&pdev->dev, "error requesting resources\n");
	233	goto err2;
	234	}
	235	/* get the irq_base from bar1 */
	236	start = pci_resource_start(pdev, 1);
	237	len = pci_resource_len(pdev, 1);
	238	base = ioremap_nocache(start, len);
	239	if (!base) {
	240	dev_err(&pdev->dev, "error mapping bar1\n");
	241	goto err3;
	242	}
	243	irq_base = (u32 )base;
	244	gpio_base = ((u32 )base + 1);
	245	/* release the IO mapping, since we already get the info from bar1 */
	246	iounmap(base);
	247	/* get the register base from bar0 */
	248	start = pci_resource_start(pdev, 0);
	249	len = pci_resource_len(pdev, 0);
	250	base = ioremap_nocache(start, len);
	251	if (!base) {
	252	dev_err(&pdev->dev, "error mapping bar0\n");
	253	retval = -EFAULT;
	254	goto err3;
	255	}
	256
	257	lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
	258	if (!lnw) {
	259	dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n");
	260	retval = -ENOMEM;
	261	goto err4;
	262	}
	263	lnw->reg_base = base;
	264	lnw->irq_base = irq_base;
	265	lnw->chip.label = dev_name(&pdev->dev);
	266	lnw->chip.direction_input = lnw_gpio_direction_input;
	267	lnw->chip.direction_output = lnw_gpio_direction_output;
	268	lnw->chip.get = lnw_gpio_get;
	269	lnw->chip.set = lnw_gpio_set;
	270	lnw->chip.to_irq = lnw_gpio_to_irq;
	271	lnw->chip.base = gpio_base;
8081c84c	272	lnw->chip.ngpio = id->driver_data;
8bf02617 AD	273	lnw->chip.can_sleep = 0;
	274	pci_set_drvdata(pdev, lnw);
	275	retval = gpiochip_add(&lnw->chip);
	276	if (retval) {
	277	dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval);
	278	goto err5;
	279	}
674db906 TG	280	irq_set_handler_data(pdev->irq, lnw);
674db906 TG	281	irq_set_chained_handler(pdev->irq, lnw_irq_handler);
8bf02617	282	for (i = 0; i < lnw->chip.ngpio; i++) {
674db906 TG	283	irq_set_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip,
	284	handle_simple_irq, "demux");
	285	irq_set_chip_data(i + lnw->irq_base, lnw);
8bf02617 AD	286	}
	287
	288	spin_lock_init(&lnw->lock);
	289	goto done;
	290	err5:
	291	kfree(lnw);
	292	err4:
	293	iounmap(base);
	294	err3:
	295	pci_release_regions(pdev);
	296	err2:
	297	pci_disable_device(pdev);
	298	done:
	299	return retval;
	300	}
	301
	302	static struct pci_driver lnw_gpio_driver = {
	303	.name = "langwell_gpio",
	304	.id_table = lnw_gpio_ids,
	305	.probe = lnw_gpio_probe,
	306	};
	307
72b4379e AC	308
	309	static int __devinit wp_gpio_probe(struct platform_device *pdev)
	310	{
	311	struct lnw_gpio *lnw;
	312	struct gpio_chip *gc;
	313	struct resource *rc;
	314	int retval = 0;
	315
	316	rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	317	if (!rc)
	318	return -EINVAL;
	319
	320	lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
	321	if (!lnw) {
	322	dev_err(&pdev->dev,
	323	"can't allocate whitneypoint_gpio chip data\n");
	324	return -ENOMEM;
	325	}
	326	lnw->reg_base = ioremap_nocache(rc->start, resource_size(rc));
	327	if (lnw->reg_base == NULL) {
	328	retval = -EINVAL;
	329	goto err_kmalloc;
	330	}
	331	spin_lock_init(&lnw->lock);
	332	gc = &lnw->chip;
	333	gc->label = dev_name(&pdev->dev);
	334	gc->owner = THIS_MODULE;
	335	gc->direction_input = lnw_gpio_direction_input;
	336	gc->direction_output = lnw_gpio_direction_output;
	337	gc->get = lnw_gpio_get;
	338	gc->set = lnw_gpio_set;
	339	gc->to_irq = NULL;
	340	gc->base = 0;
	341	gc->ngpio = 64;
	342	gc->can_sleep = 0;
	343	retval = gpiochip_add(gc);
	344	if (retval) {
	345	dev_err(&pdev->dev, "whitneypoint gpiochip_add error %d\n",
	346	retval);
	347	goto err_ioremap;
	348	}
	349	platform_set_drvdata(pdev, lnw);
	350	return 0;
	351	err_ioremap:
	352	iounmap(lnw->reg_base);
	353	err_kmalloc:
	354	kfree(lnw);
	355	return retval;
	356	}
	357
	358	static int __devexit wp_gpio_remove(struct platform_device *pdev)
	359	{
	360	struct lnw_gpio *lnw = platform_get_drvdata(pdev);
	361	int err;
	362	err = gpiochip_remove(&lnw->chip);
	363	if (err)
	364	dev_err(&pdev->dev, "failed to remove gpio_chip.\n");
	365	iounmap(lnw->reg_base);
	366	kfree(lnw);
	367	platform_set_drvdata(pdev, NULL);
	368	return 0;
	369	}
	370
	371	static struct platform_driver wp_gpio_driver = {
372	.probe = wp_gpio_probe,
373	.remove = __devexit_p(wp_gpio_remove),
374	.driver = {
375	.name = "wp_gpio",
376	.owner = THIS_MODULE,
377	},
378	};
379
8bf02617 AD	380	static int __init lnw_gpio_init(void)
8bf02617 AD	381	{
72b4379e AC	382	int ret;
	383	ret = pci_register_driver(&lnw_gpio_driver);
	384	if (ret < 0)
	385	return ret;
	386	ret = platform_driver_register(&wp_gpio_driver);
	387	if (ret < 0)
	388	pci_unregister_driver(&lnw_gpio_driver);
	389	return ret;
8bf02617 AD	390	}
	391
	392	device_initcall(lnw_gpio_init);