[linux-2.6-block.git] / drivers / gpio / gpio-it87.c

/*
 *  GPIO interface for IT87xx Super I/O chips
 *
 *  Author: Diego Elio Pettenò <flameeyes@flameeyes.eu>
 *
 *  Based on it87_wdt.c     by Oliver Schuster
 *           gpio-it8761e.c by Denis Turischev
 *           gpio-stmpe.c   by Rabin Vincent
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License 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; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/gpio.h>

/* Chip Id numbers */
#define NO_DEV_ID	0xffff
#define IT8728_ID	0x8728
#define IT8732_ID	0x8732
#define IT8761_ID	0x8761

/* IO Ports */
#define REG		0x2e
#define VAL		0x2f

/* Logical device Numbers LDN */
#define GPIO		0x07

/* Configuration Registers and Functions */
#define LDNREG		0x07
#define CHIPID		0x20
#define CHIPREV		0x22

/**
 * struct it87_gpio - it87-specific GPIO chip
 * @chip the underlying gpio_chip structure
 * @lock a lock to avoid races between operations
 * @io_base base address for gpio ports
 * @io_size size of the port rage starting from io_base.
 * @output_base Super I/O register address for Output Enable register
 * @simple_base Super I/O 'Simple I/O' Enable register
 * @simple_size Super IO 'Simple I/O' Enable register size; this is
 *	required because IT87xx chips might only provide Simple I/O
 *	switches on a subset of lines, whereas the others keep the
 *	same status all time.
 */
struct it87_gpio {
	struct gpio_chip chip;
	spinlock_t lock;
	u16 io_base;
	u16 io_size;
	u8 output_base;
	u8 simple_base;
	u8 simple_size;
};

static struct it87_gpio it87_gpio_chip = {
	.lock = __SPIN_LOCK_UNLOCKED(it87_gpio_chip.lock),
};

/* Superio chip access functions; copied from wdt_it87 */

static inline int superio_enter(void)
{
	/*
	 * Try to reserve REG and REG + 1 for exclusive access.
	 */
	if (!request_muxed_region(REG, 2, KBUILD_MODNAME))
		return -EBUSY;

	outb(0x87, REG);
	outb(0x01, REG);
	outb(0x55, REG);
	outb(0x55, REG);
	return 0;
}

static inline void superio_exit(void)
{
	outb(0x02, REG);
	outb(0x02, VAL);
	release_region(REG, 2);
}

static inline void superio_select(int ldn)
{
	outb(LDNREG, REG);
	outb(ldn, VAL);
}

static inline int superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

static inline void superio_outb(int val, int reg)
{
	outb(reg, REG);
	outb(val, VAL);
}

static inline int superio_inw(int reg)
{
	int val;

	outb(reg++, REG);
	val = inb(VAL) << 8;
	outb(reg, REG);
	val |= inb(VAL);
	return val;
}

static inline void superio_outw(int val, int reg)
{
	outb(reg++, REG);
	outb(val >> 8, VAL);
	outb(reg, REG);
	outb(val, VAL);
}

static inline void superio_set_mask(int mask, int reg)
{
	u8 curr_val = superio_inb(reg);
	u8 new_val = curr_val | mask;

	if (curr_val != new_val)
		superio_outb(new_val, reg);
}

static inline void superio_clear_mask(int mask, int reg)
{
	u8 curr_val = superio_inb(reg);
	u8 new_val = curr_val & ~mask;

	if (curr_val != new_val)
		superio_outb(new_val, reg);
}

static int it87_gpio_request(struct gpio_chip *chip, unsigned gpio_num)
{
	u8 mask, group;
	int rc = 0;
	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);

	mask = 1 << (gpio_num % 8);
	group = (gpio_num / 8);

	spin_lock(&it87_gpio->lock);

	rc = superio_enter();
	if (rc)
		goto exit;

	/* not all the IT87xx chips support Simple I/O and not all of
	 * them allow all the lines to be set/unset to Simple I/O.
	 */
	if (group < it87_gpio->simple_size)
		superio_set_mask(mask, group + it87_gpio->simple_base);

	/* clear output enable, setting the pin to input, as all the
	 * newly-exported GPIO interfaces are set to input.
	 */
	superio_clear_mask(mask, group + it87_gpio->output_base);

	superio_exit();

exit:
	spin_unlock(&it87_gpio->lock);
	return rc;
}

static int it87_gpio_get(struct gpio_chip *chip, unsigned gpio_num)
{
	u16 reg;
	u8 mask;
	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);

	mask = 1 << (gpio_num % 8);
	reg = (gpio_num / 8) + it87_gpio->io_base;

	return !!(inb(reg) & mask);
}

static int it87_gpio_direction_in(struct gpio_chip *chip, unsigned gpio_num)
{
	u8 mask, group;
	int rc = 0;
	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);

	mask = 1 << (gpio_num % 8);
	group = (gpio_num / 8);

	spin_lock(&it87_gpio->lock);

	rc = superio_enter();
	if (rc)
		goto exit;

	/* clear the output enable bit */
	superio_clear_mask(mask, group + it87_gpio->output_base);

	superio_exit();

exit:
	spin_unlock(&it87_gpio->lock);
	return rc;
}

static void it87_gpio_set(struct gpio_chip *chip,
			  unsigned gpio_num, int val)
{
	u8 mask, curr_vals;
	u16 reg;
	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);

	mask = 1 << (gpio_num % 8);
	reg = (gpio_num / 8) + it87_gpio->io_base;

	curr_vals = inb(reg);
	if (val)
		outb(curr_vals | mask, reg);
	else
		outb(curr_vals & ~mask, reg);
}

static int it87_gpio_direction_out(struct gpio_chip *chip,
				   unsigned gpio_num, int val)
{
	u8 mask, group;
	int rc = 0;
	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);

	mask = 1 << (gpio_num % 8);
	group = (gpio_num / 8);

	spin_lock(&it87_gpio->lock);

	rc = superio_enter();
	if (rc)
		goto exit;

	/* set the output enable bit */
	superio_set_mask(mask, group + it87_gpio->output_base);

	it87_gpio_set(chip, gpio_num, val);

	superio_exit();

exit:
	spin_unlock(&it87_gpio->lock);
	return rc;
}

static struct gpio_chip it87_template_chip = {
	.label			= KBUILD_MODNAME,
	.owner			= THIS_MODULE,
	.request		= it87_gpio_request,
	.get			= it87_gpio_get,
	.direction_input	= it87_gpio_direction_in,
	.set			= it87_gpio_set,
	.direction_output	= it87_gpio_direction_out,
	.base			= -1
};

static int __init it87_gpio_init(void)
{
	int rc = 0, i;
	u16 chip_type;
	u8 chip_rev, gpio_ba_reg;
	char *labels, **labels_table;

	struct it87_gpio *it87_gpio = &it87_gpio_chip;

	rc = superio_enter();
	if (rc)
		return rc;

	chip_type = superio_inw(CHIPID);
	chip_rev  = superio_inb(CHIPREV) & 0x0f;
	superio_exit();

	it87_gpio->chip = it87_template_chip;

	switch (chip_type) {
	case IT8728_ID:
	case IT8732_ID:
		gpio_ba_reg = 0x62;
		it87_gpio->io_size = 8;
		it87_gpio->output_base = 0xc8;
		it87_gpio->simple_base = 0xc0;
		it87_gpio->simple_size = 5;
		it87_gpio->chip.ngpio = 64;
		break;
	case IT8761_ID:
		gpio_ba_reg = 0x60;
		it87_gpio->io_size = 4;
		it87_gpio->output_base = 0xf0;
		it87_gpio->simple_size = 0;
		it87_gpio->chip.ngpio = 16;
		break;
	case NO_DEV_ID:
		pr_err("no device\n");
		return -ENODEV;
	default:
		pr_err("Unknown Chip found, Chip %04x Revision %x\n",
		       chip_type, chip_rev);
		return -ENODEV;
	}

	rc = superio_enter();
	if (rc)
		return rc;

	superio_select(GPIO);

	/* fetch GPIO base address */
	it87_gpio->io_base = superio_inw(gpio_ba_reg);

	superio_exit();

	pr_info("Found Chip IT%04x rev %x. %u GPIO lines starting at %04xh\n",
		chip_type, chip_rev, it87_gpio->chip.ngpio,
		it87_gpio->io_base);

	if (!request_region(it87_gpio->io_base, it87_gpio->io_size,
							KBUILD_MODNAME))
		return -EBUSY;

	/* Set up aliases for the GPIO connection.
	 *
	 * ITE documentation for recent chips such as the IT8728F
	 * refers to the GPIO lines as GPxy, with a coordinates system
	 * where x is the GPIO group (starting from 1) and y is the
	 * bit within the group.
	 *
	 * By creating these aliases, we make it easier to understand
	 * to which GPIO pin we're referring to.
	 */
	labels = kcalloc(it87_gpio->chip.ngpio, sizeof("it87_gpXY"),
								GFP_KERNEL);
	labels_table = kcalloc(it87_gpio->chip.ngpio, sizeof(const char *),
								GFP_KERNEL);

	if (!labels || !labels_table) {
		rc = -ENOMEM;
		goto labels_free;
	}

	for (i = 0; i < it87_gpio->chip.ngpio; i++) {
		char *label = &labels[i * sizeof("it87_gpXY")];

		sprintf(label, "it87_gp%u%u", 1+(i/8), i%8);
		labels_table[i] = label;
	}

	it87_gpio->chip.names = (const char *const*)labels_table;

	rc = gpiochip_add_data(&it87_gpio->chip, it87_gpio);
	if (rc)
		goto labels_free;

	return 0;

labels_free:
	kfree(labels_table);
	kfree(labels);
	release_region(it87_gpio->io_base, it87_gpio->io_size);
	return rc;
}

static void __exit it87_gpio_exit(void)
{
	struct it87_gpio *it87_gpio = &it87_gpio_chip;

	gpiochip_remove(&it87_gpio->chip);
	release_region(it87_gpio->io_base, it87_gpio->io_size);
	kfree(it87_gpio->chip.names[0]);
	kfree(it87_gpio->chip.names);
}

module_init(it87_gpio_init);
module_exit(it87_gpio_exit);

MODULE_AUTHOR("Diego Elio PettenÃ² <flameeyes@flameeyes.eu>");
MODULE_DESCRIPTION("GPIO interface for IT87xx Super I/O chips");
MODULE_LICENSE("GPL");
Commit	Line	Data
b8664924 DEP	1	/*
	2	* GPIO interface for IT87xx Super I/O chips
	3	*
	4	* Author: Diego Elio Pettenò <flameeyes@flameeyes.eu>
	5	*
	6	* Based on it87_wdt.c by Oliver Schuster
	7	* gpio-it8761e.c by Denis Turischev
	8	* gpio-stmpe.c by Rabin Vincent
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License 2 as published
	12	* by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; see the file COPYING. If not, write to
	21	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	24	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	25
	26	#include <linux/init.h>
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/io.h>
	30	#include <linux/errno.h>
	31	#include <linux/ioport.h>
	32	#include <linux/slab.h>
	33	#include <linux/gpio.h>
	34
	35	/* Chip Id numbers */
	36	#define NO_DEV_ID 0xffff
	37	#define IT8728_ID 0x8728
	38	#define IT8732_ID 0x8732
	39	#define IT8761_ID 0x8761
	40
	41	/* IO Ports */
	42	#define REG 0x2e
	43	#define VAL 0x2f
	44
	45	/* Logical device Numbers LDN */
	46	#define GPIO 0x07
	47
	48	/* Configuration Registers and Functions */
	49	#define LDNREG 0x07
	50	#define CHIPID 0x20
	51	#define CHIPREV 0x22
	52
	53	/**
	54	* struct it87_gpio - it87-specific GPIO chip
	55	* @chip the underlying gpio_chip structure
	56	* @lock a lock to avoid races between operations
	57	* @io_base base address for gpio ports
	58	* @io_size size of the port rage starting from io_base.
	59	* @output_base Super I/O register address for Output Enable register
	60	* @simple_base Super I/O 'Simple I/O' Enable register
	61	* @simple_size Super IO 'Simple I/O' Enable register size; this is
	62	* required because IT87xx chips might only provide Simple I/O
	63	* switches on a subset of lines, whereas the others keep the
	64	* same status all time.
65	*/
66	struct it87_gpio {
67	struct gpio_chip chip;
68	spinlock_t lock;
69	u16 io_base;
70	u16 io_size;
71	u8 output_base;
72	u8 simple_base;
73	u8 simple_size;
74	};
75
76	static struct it87_gpio it87_gpio_chip = {
77	.lock = __SPIN_LOCK_UNLOCKED(it87_gpio_chip.lock),
78	};
79
b8664924 DEP	80	/* Superio chip access functions; copied from wdt_it87 */
	81
	82	static inline int superio_enter(void)
	83	{
	84	/*
	85	* Try to reserve REG and REG + 1 for exclusive access.
	86	*/
	87	if (!request_muxed_region(REG, 2, KBUILD_MODNAME))
	88	return -EBUSY;
	89
	90	outb(0x87, REG);
	91	outb(0x01, REG);
	92	outb(0x55, REG);
	93	outb(0x55, REG);
	94	return 0;
	95	}
	96
	97	static inline void superio_exit(void)
	98	{
	99	outb(0x02, REG);
	100	outb(0x02, VAL);
	101	release_region(REG, 2);
	102	}
	103
	104	static inline void superio_select(int ldn)
	105	{
	106	outb(LDNREG, REG);
	107	outb(ldn, VAL);
	108	}
	109
	110	static inline int superio_inb(int reg)
	111	{
	112	outb(reg, REG);
	113	return inb(VAL);
	114	}
	115
	116	static inline void superio_outb(int val, int reg)
	117	{
	118	outb(reg, REG);
	119	outb(val, VAL);
	120	}
	121
	122	static inline int superio_inw(int reg)
	123	{
	124	int val;
	125
	126	outb(reg++, REG);
	127	val = inb(VAL) << 8;
	128	outb(reg, REG);
	129	val \|= inb(VAL);
	130	return val;
	131	}
	132
	133	static inline void superio_outw(int val, int reg)
	134	{
	135	outb(reg++, REG);
	136	outb(val >> 8, VAL);
	137	outb(reg, REG);
	138	outb(val, VAL);
	139	}
	140
	141	static inline void superio_set_mask(int mask, int reg)
	142	{
	143	u8 curr_val = superio_inb(reg);
144	u8 new_val = curr_val \| mask;
145
146	if (curr_val != new_val)
147	superio_outb(new_val, reg);
148	}
149
150	static inline void superio_clear_mask(int mask, int reg)
151	{
152	u8 curr_val = superio_inb(reg);
153	u8 new_val = curr_val & ~mask;
154
155	if (curr_val != new_val)
156	superio_outb(new_val, reg);
157	}
158
159	static int it87_gpio_request(struct gpio_chip *chip, unsigned gpio_num)
160	{
161	u8 mask, group;
162	int rc = 0;
0a38fd94	163	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);
b8664924 DEP	164
	165	mask = 1 << (gpio_num % 8);
	166	group = (gpio_num / 8);
	167
	168	spin_lock(&it87_gpio->lock);
	169
	170	rc = superio_enter();
	171	if (rc)
	172	goto exit;
	173
	174	/* not all the IT87xx chips support Simple I/O and not all of
	175	* them allow all the lines to be set/unset to Simple I/O.
	176	*/
	177	if (group < it87_gpio->simple_size)
	178	superio_set_mask(mask, group + it87_gpio->simple_base);
	179
	180	/* clear output enable, setting the pin to input, as all the
	181	* newly-exported GPIO interfaces are set to input.
	182	*/
	183	superio_clear_mask(mask, group + it87_gpio->output_base);
	184
	185	superio_exit();
	186
	187	exit:
	188	spin_unlock(&it87_gpio->lock);
	189	return rc;
	190	}
	191
	192	static int it87_gpio_get(struct gpio_chip *chip, unsigned gpio_num)
	193	{
	194	u16 reg;
	195	u8 mask;
0a38fd94	196	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);
b8664924 DEP	197
	198	mask = 1 << (gpio_num % 8);
	199	reg = (gpio_num / 8) + it87_gpio->io_base;
	200
	201	return !!(inb(reg) & mask);
	202	}
	203
	204	static int it87_gpio_direction_in(struct gpio_chip *chip, unsigned gpio_num)
	205	{
	206	u8 mask, group;
	207	int rc = 0;
0a38fd94	208	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);
b8664924 DEP	209
	210	mask = 1 << (gpio_num % 8);
	211	group = (gpio_num / 8);
	212
	213	spin_lock(&it87_gpio->lock);
	214
	215	rc = superio_enter();
	216	if (rc)
	217	goto exit;
	218
	219	/* clear the output enable bit */
	220	superio_clear_mask(mask, group + it87_gpio->output_base);
	221
	222	superio_exit();
	223
	224	exit:
	225	spin_unlock(&it87_gpio->lock);
	226	return rc;
	227	}
	228
	229	static void it87_gpio_set(struct gpio_chip *chip,
	230	unsigned gpio_num, int val)
	231	{
	232	u8 mask, curr_vals;
	233	u16 reg;
0a38fd94	234	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);
b8664924 DEP	235
	236	mask = 1 << (gpio_num % 8);
	237	reg = (gpio_num / 8) + it87_gpio->io_base;
	238
	239	curr_vals = inb(reg);
	240	if (val)
	241	outb(curr_vals \| mask, reg);
	242	else
	243	outb(curr_vals & ~mask, reg);
	244	}
	245
	246	static int it87_gpio_direction_out(struct gpio_chip *chip,
	247	unsigned gpio_num, int val)
	248	{
	249	u8 mask, group;
	250	int rc = 0;
0a38fd94	251	struct it87_gpio *it87_gpio = gpiochip_get_data(chip);
b8664924 DEP	252
	253	mask = 1 << (gpio_num % 8);
	254	group = (gpio_num / 8);
	255
	256	spin_lock(&it87_gpio->lock);
	257
	258	rc = superio_enter();
	259	if (rc)
	260	goto exit;
	261
	262	/* set the output enable bit */
	263	superio_set_mask(mask, group + it87_gpio->output_base);
	264
	265	it87_gpio_set(chip, gpio_num, val);
	266
	267	superio_exit();
	268
	269	exit:
	270	spin_unlock(&it87_gpio->lock);
	271	return rc;
	272	}
	273
	274	static struct gpio_chip it87_template_chip = {
	275	.label = KBUILD_MODNAME,
	276	.owner = THIS_MODULE,
	277	.request = it87_gpio_request,
	278	.get = it87_gpio_get,
	279	.direction_input = it87_gpio_direction_in,
	280	.set = it87_gpio_set,
	281	.direction_output = it87_gpio_direction_out,
	282	.base = -1
	283	};
	284
	285	static int __init it87_gpio_init(void)
	286	{
	287	int rc = 0, i;
	288	u16 chip_type;
	289	u8 chip_rev, gpio_ba_reg;
	290	char labels, *labels_table;
	291
	292	struct it87_gpio *it87_gpio = &it87_gpio_chip;
	293
	294	rc = superio_enter();
	295	if (rc)
	296	return rc;
	297
	298	chip_type = superio_inw(CHIPID);
	299	chip_rev = superio_inb(CHIPREV) & 0x0f;
	300	superio_exit();
	301
	302	it87_gpio->chip = it87_template_chip;
	303
	304	switch (chip_type) {
	305	case IT8728_ID:
	306	case IT8732_ID:
	307	gpio_ba_reg = 0x62;
	308	it87_gpio->io_size = 8;
	309	it87_gpio->output_base = 0xc8;
	310	it87_gpio->simple_base = 0xc0;
	311	it87_gpio->simple_size = 5;
	312	it87_gpio->chip.ngpio = 64;
	313	break;
	314	case IT8761_ID:
	315	gpio_ba_reg = 0x60;
316	it87_gpio->io_size = 4;
317	it87_gpio->output_base = 0xf0;
318	it87_gpio->simple_size = 0;
319	it87_gpio->chip.ngpio = 16;
320	break;
321	case NO_DEV_ID:
322	pr_err("no device\n");
323	return -ENODEV;
324	default:
325	pr_err("Unknown Chip found, Chip %04x Revision %x\n",
326	chip_type, chip_rev);
327	return -ENODEV;
328	}
329
330	rc = superio_enter();
331	if (rc)
332	return rc;
333
334	superio_select(GPIO);
335
336	/* fetch GPIO base address */
337	it87_gpio->io_base = superio_inw(gpio_ba_reg);
338
339	superio_exit();
340
341	pr_info("Found Chip IT%04x rev %x. %u GPIO lines starting at %04xh\n",
342	chip_type, chip_rev, it87_gpio->chip.ngpio,
343	it87_gpio->io_base);
344
345	if (!request_region(it87_gpio->io_base, it87_gpio->io_size,
346	KBUILD_MODNAME))
347	return -EBUSY;
348
349	/* Set up aliases for the GPIO connection.
350	*
351	* ITE documentation for recent chips such as the IT8728F
352	* refers to the GPIO lines as GPxy, with a coordinates system
353	* where x is the GPIO group (starting from 1) and y is the
354	* bit within the group.
355	*
356	* By creating these aliases, we make it easier to understand
357	* to which GPIO pin we're referring to.
358	*/
359	labels = kcalloc(it87_gpio->chip.ngpio, sizeof("it87_gpXY"),
360	GFP_KERNEL);
361	labels_table = kcalloc(it87_gpio->chip.ngpio, sizeof(const char *),
362	GFP_KERNEL);
363
364	if (!labels \|\| !labels_table) {
365	rc = -ENOMEM;
366	goto labels_free;
367	}
368
369	for (i = 0; i < it87_gpio->chip.ngpio; i++) {
370	char label = &labels[i sizeof("it87_gpXY")];
371
372	sprintf(label, "it87_gp%u%u", 1+(i/8), i%8);
373	labels_table[i] = label;
374	}
375
376	it87_gpio->chip.names = (const char const)labels_table;
377
0a38fd94	378	rc = gpiochip_add_data(&it87_gpio->chip, it87_gpio);
b8664924 DEP	379	if (rc)
	380	goto labels_free;
	381
	382	return 0;
	383
	384	labels_free:
	385	kfree(labels_table);
	386	kfree(labels);
	387	release_region(it87_gpio->io_base, it87_gpio->io_size);
	388	return rc;
	389	}
	390
	391	static void __exit it87_gpio_exit(void)
	392	{
	393	struct it87_gpio *it87_gpio = &it87_gpio_chip;
	394
	395	gpiochip_remove(&it87_gpio->chip);
	396	release_region(it87_gpio->io_base, it87_gpio->io_size);
	397	kfree(it87_gpio->chip.names[0]);
	398	kfree(it87_gpio->chip.names);
	399	}
	400
	401	module_init(it87_gpio_init);
	402	module_exit(it87_gpio_exit);
	403
	404	MODULE_AUTHOR("Diego Elio PettenÃ² <flameeyes@flameeyes.eu>");
	405	MODULE_DESCRIPTION("GPIO interface for IT87xx Super I/O chips");
	406	MODULE_LICENSE("GPL");