[linux-2.6-block.git] / drivers / gpio / gpio-wm831x.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * gpiolib support for Wolfson WM831x PMICs
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/mfd/wm831x/gpio.h>
#include <linux/mfd/wm831x/irq.h>

struct wm831x_gpio {
	struct wm831x *wm831x;
	struct gpio_chip gpio_chip;
};

static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int val = WM831X_GPN_DIR;

	if (wm831x->has_gpio_ena)
		val |= WM831X_GPN_TRI;

	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
			       WM831X_GPN_DIR | WM831X_GPN_TRI |
			       WM831X_GPN_FN_MASK, val);
}

static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int ret;

	ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
	if (ret < 0)
		return ret;

	if (ret & 1 << offset)
		return 1;
	else
		return 0;
}

static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;

	wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
			value << offset);
}

static int wm831x_gpio_direction_out(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int val = 0;
	int ret;

	if (wm831x->has_gpio_ena)
		val |= WM831X_GPN_TRI;

	ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
			      WM831X_GPN_DIR | WM831X_GPN_TRI |
			      WM831X_GPN_FN_MASK, val);
	if (ret < 0)
		return ret;

	/* Can only set GPIO state once it's in output mode */
	wm831x_gpio_set(chip, offset, value);

	return 0;
}

static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;

	return irq_create_mapping(wm831x->irq_domain,
				  WM831X_IRQ_GPIO_1 + offset);
}

static int wm831x_gpio_set_debounce(struct wm831x *wm831x, unsigned offset,
				    unsigned debounce)
{
	int reg = WM831X_GPIO1_CONTROL + offset;
	int ret, fn;

	ret = wm831x_reg_read(wm831x, reg);
	if (ret < 0)
		return ret;

	switch (ret & WM831X_GPN_FN_MASK) {
	case 0:
	case 1:
		break;
	default:
		/* Not in GPIO mode */
		return -EBUSY;
	}

	if (debounce >= 32 && debounce <= 64)
		fn = 0;
	else if (debounce >= 4000 && debounce <= 8000)
		fn = 1;
	else
		return -EINVAL;

	return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
}

static int wm831x_set_config(struct gpio_chip *chip, unsigned int offset,
			     unsigned long config)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int reg = WM831X_GPIO1_CONTROL + offset;

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return wm831x_set_bits(wm831x, reg,
				       WM831X_GPN_OD_MASK, WM831X_GPN_OD);
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		return wm831x_set_bits(wm831x, reg,
				       WM831X_GPN_OD_MASK, 0);
	case PIN_CONFIG_INPUT_DEBOUNCE:
		return wm831x_gpio_set_debounce(wm831x, offset,
			pinconf_to_config_argument(config));
	default:
		break;
	}

	return -ENOTSUPP;
}

#ifdef CONFIG_DEBUG_FS
static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int i, tristated;

	for (i = 0; i < chip->ngpio; i++) {
		int gpio = i + chip->base;
		int reg;
		const char *label, *pull, *powerdomain;

		/* We report the GPIO even if it's not requested since
		 * we're also reporting things like alternate
		 * functions which apply even when the GPIO is not in
		 * use as a GPIO.
		 */
		label = gpiochip_is_requested(chip, i);
		if (!label)
			label = "Unrequested";

		seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);

		reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
		if (reg < 0) {
			dev_err(wm831x->dev,
				"GPIO control %d read failed: %d\n",
				gpio, reg);
			seq_putc(s, '\n');
			continue;
		}

		switch (reg & WM831X_GPN_PULL_MASK) {
		case WM831X_GPIO_PULL_NONE:
			pull = "nopull";
			break;
		case WM831X_GPIO_PULL_DOWN:
			pull = "pulldown";
			break;
		case WM831X_GPIO_PULL_UP:
			pull = "pullup";
			break;
		default:
			pull = "INVALID PULL";
			break;
		}

		switch (i + 1) {
		case 1 ... 3:
		case 7 ... 9:
			if (reg & WM831X_GPN_PWR_DOM)
				powerdomain = "VPMIC";
			else
				powerdomain = "DBVDD";
			break;

		case 4 ... 6:
		case 10 ... 12:
			if (reg & WM831X_GPN_PWR_DOM)
				powerdomain = "SYSVDD";
			else
				powerdomain = "DBVDD";
			break;

		case 13 ... 16:
			powerdomain = "TPVDD";
			break;

		default:
			BUG();
			break;
		}

		tristated = reg & WM831X_GPN_TRI;
		if (wm831x->has_gpio_ena)
			tristated = !tristated;

		seq_printf(s, " %s %s %s %s%s\n"
			   "                                  %s%s (0x%4x)\n",
			   reg & WM831X_GPN_DIR ? "in" : "out",
			   wm831x_gpio_get(chip, i) ? "high" : "low",
			   pull,
			   powerdomain,
			   reg & WM831X_GPN_POL ? "" : " inverted",
			   reg & WM831X_GPN_OD ? "open-drain" : "push-pull",
			   tristated ? " tristated" : "",
			   reg);
	}
}
#else
#define wm831x_gpio_dbg_show NULL
#endif

static const struct gpio_chip template_chip = {
	.label			= "wm831x",
	.owner			= THIS_MODULE,
	.direction_input	= wm831x_gpio_direction_in,
	.get			= wm831x_gpio_get,
	.direction_output	= wm831x_gpio_direction_out,
	.set			= wm831x_gpio_set,
	.to_irq			= wm831x_gpio_to_irq,
	.set_config		= wm831x_set_config,
	.dbg_show		= wm831x_gpio_dbg_show,
	.can_sleep		= true,
};

static int wm831x_gpio_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = &wm831x->pdata;
	struct wm831x_gpio *wm831x_gpio;
	int ret;

	wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
				   GFP_KERNEL);
	if (wm831x_gpio == NULL)
		return -ENOMEM;

	wm831x_gpio->wm831x = wm831x;
	wm831x_gpio->gpio_chip = template_chip;
	wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
	wm831x_gpio->gpio_chip.parent = &pdev->dev;
	if (pdata && pdata->gpio_base)
		wm831x_gpio->gpio_chip.base = pdata->gpio_base;
	else
		wm831x_gpio->gpio_chip.base = -1;
#ifdef CONFIG_OF_GPIO
	wm831x_gpio->gpio_chip.of_node = wm831x->dev->of_node;
#endif

	ret = devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip,
				     wm831x_gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, wm831x_gpio);

	return ret;
}

static struct platform_driver wm831x_gpio_driver = {
	.driver.name	= "wm831x-gpio",
	.probe		= wm831x_gpio_probe,
};

static int __init wm831x_gpio_init(void)
{
	return platform_driver_register(&wm831x_gpio_driver);
}
subsys_initcall(wm831x_gpio_init);

static void __exit wm831x_gpio_exit(void)
{
	platform_driver_unregister(&wm831x_gpio_driver);
}
module_exit(wm831x_gpio_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-gpio");
Commit	Line	Data
66dbe750	1	// SPDX-License-Identifier: GPL-2.0+
e4b736f1	2	/*
c103de24	3	* gpiolib support for Wolfson WM831x PMICs
e4b736f1 MB	4	*
	5	* Copyright 2009 Wolfson Microelectronics PLC.
	6	*
	7	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	8	*
e4b736f1 MB	9	*/
	10
	11	#include <linux/kernel.h>
5a0e3ad6	12	#include <linux/slab.h>
e4b736f1	13	#include <linux/module.h>
10833c4b	14	#include <linux/gpio/driver.h>
e4b736f1 MB	15	#include <linux/mfd/core.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/seq_file.h>
	18
	19	#include <linux/mfd/wm831x/core.h>
	20	#include <linux/mfd/wm831x/pdata.h>
	21	#include <linux/mfd/wm831x/gpio.h>
dc0fb25c	22	#include <linux/mfd/wm831x/irq.h>
e4b736f1	23
e4b736f1 MB	24	struct wm831x_gpio {
	25	struct wm831x *wm831x;
	26	struct gpio_chip gpio_chip;
	27	};
	28
e4b736f1 MB	29	static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
e4b736f1 MB	30	{
9b3c817b	31	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1	32	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81 MB	33	int val = WM831X_GPN_DIR;
	34
	35	if (wm831x->has_gpio_ena)
	36	val \|= WM831X_GPN_TRI;
e4b736f1 MB	37
e4b736f1 MB	38	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
1bca748c MB	39	WM831X_GPN_DIR \| WM831X_GPN_TRI \|
1bca748c MB	40	WM831X_GPN_FN_MASK, val);
e4b736f1 MB	41	}
	42
	43	static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
	44	{
9b3c817b	45	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1 MB	46	struct wm831x *wm831x = wm831x_gpio->wm831x;
	47	int ret;
	48
	49	ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
	50	if (ret < 0)
	51	return ret;
	52
	53	if (ret & 1 << offset)
	54	return 1;
	55	else
	56	return 0;
	57	}
	58
3383d23d	59	static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
e4b736f1	60	{
9b3c817b	61	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1 MB	62	struct wm831x *wm831x = wm831x_gpio->wm831x;
e4b736f1 MB	63
3383d23d MB	64	wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
3383d23d MB	65	value << offset);
e4b736f1 MB	66	}
e4b736f1 MB	67
3383d23d MB	68	static int wm831x_gpio_direction_out(struct gpio_chip *chip,
3383d23d MB	69	unsigned offset, int value)
e4b736f1	70	{
9b3c817b	71	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1	72	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81	73	int val = 0;
3383d23d	74	int ret;
e4b736f1	75
f92e8f81 MB	76	if (wm831x->has_gpio_ena)
	77	val \|= WM831X_GPN_TRI;
	78
3383d23d	79	ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
1bca748c MB	80	WM831X_GPN_DIR \| WM831X_GPN_TRI \|
1bca748c MB	81	WM831X_GPN_FN_MASK, val);
3383d23d MB	82	if (ret < 0)
	83	return ret;
	84
	85	/* Can only set GPIO state once it's in output mode */
	86	wm831x_gpio_set(chip, offset, value);
	87
	88	return 0;
e4b736f1 MB	89	}
e4b736f1 MB	90
dc0fb25c MB	91	static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
dc0fb25c MB	92	{
9b3c817b	93	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
dc0fb25c MB	94	struct wm831x *wm831x = wm831x_gpio->wm831x;
dc0fb25c MB	95
cd99758b MB	96	return irq_create_mapping(wm831x->irq_domain,
cd99758b MB	97	WM831X_IRQ_GPIO_1 + offset);
dc0fb25c MB	98	}
dc0fb25c MB	99
2956b5d9	100	static int wm831x_gpio_set_debounce(struct wm831x *wm831x, unsigned offset,
b12c35e2 MB	101	unsigned debounce)
b12c35e2 MB	102	{
b12c35e2 MB	103	int reg = WM831X_GPIO1_CONTROL + offset;
	104	int ret, fn;
	105
	106	ret = wm831x_reg_read(wm831x, reg);
	107	if (ret < 0)
	108	return ret;
	109
	110	switch (ret & WM831X_GPN_FN_MASK) {
	111	case 0:
	112	case 1:
	113	break;
	114	default:
	115	/* Not in GPIO mode */
	116	return -EBUSY;
	117	}
	118
	119	if (debounce >= 32 && debounce <= 64)
	120	fn = 0;
	121	else if (debounce >= 4000 && debounce <= 8000)
	122	fn = 1;
	123	else
	124	return -EINVAL;
	125
	126	return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
	127	}
	128
2956b5d9 MW	129	static int wm831x_set_config(struct gpio_chip *chip, unsigned int offset,
2956b5d9 MW	130	unsigned long config)
51c27da1 LW	131	{
	132	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	133	struct wm831x *wm831x = wm831x_gpio->wm831x;
	134	int reg = WM831X_GPIO1_CONTROL + offset;
	135
2956b5d9 MW	136	switch (pinconf_to_config_param(config)) {
2956b5d9 MW	137	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
51c27da1 LW	138	return wm831x_set_bits(wm831x, reg,
51c27da1 LW	139	WM831X_GPN_OD_MASK, WM831X_GPN_OD);
2956b5d9	140	case PIN_CONFIG_DRIVE_PUSH_PULL:
51c27da1 LW	141	return wm831x_set_bits(wm831x, reg,
51c27da1 LW	142	WM831X_GPN_OD_MASK, 0);
2956b5d9 MW	143	case PIN_CONFIG_INPUT_DEBOUNCE:
	144	return wm831x_gpio_set_debounce(wm831x, offset,
	145	pinconf_to_config_argument(config));
51c27da1 LW	146	default:
	147	break;
	148	}
	149
	150	return -ENOTSUPP;
	151	}
	152
e4b736f1 MB	153	#ifdef CONFIG_DEBUG_FS
	154	static void wm831x_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
	155	{
9b3c817b	156	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1	157	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81	158	int i, tristated;
e4b736f1 MB	159
	160	for (i = 0; i < chip->ngpio; i++) {
	161	int gpio = i + chip->base;
	162	int reg;
	163	const char label, pull, *powerdomain;
	164
	165	/* We report the GPIO even if it's not requested since
	166	* we're also reporting things like alternate
	167	* functions which apply even when the GPIO is not in
	168	* use as a GPIO.
	169	*/
	170	label = gpiochip_is_requested(chip, i);
	171	if (!label)
	172	label = "Unrequested";
	173
	174	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	175
	176	reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
	177	if (reg < 0) {
	178	dev_err(wm831x->dev,
	179	"GPIO control %d read failed: %d\n",
	180	gpio, reg);
b5cd7802	181	seq_putc(s, '\n');
e4b736f1 MB	182	continue;
	183	}
	184
	185	switch (reg & WM831X_GPN_PULL_MASK) {
	186	case WM831X_GPIO_PULL_NONE:
	187	pull = "nopull";
	188	break;
	189	case WM831X_GPIO_PULL_DOWN:
	190	pull = "pulldown";
	191	break;
	192	case WM831X_GPIO_PULL_UP:
	193	pull = "pullup";
164d5c39	194	break;
e4b736f1 MB	195	default:
	196	pull = "INVALID PULL";
	197	break;
	198	}
	199
	200	switch (i + 1) {
	201	case 1 ... 3:
	202	case 7 ... 9:
	203	if (reg & WM831X_GPN_PWR_DOM)
	204	powerdomain = "VPMIC";
	205	else
	206	powerdomain = "DBVDD";
	207	break;
	208
	209	case 4 ... 6:
	210	case 10 ... 12:
	211	if (reg & WM831X_GPN_PWR_DOM)
	212	powerdomain = "SYSVDD";
	213	else
	214	powerdomain = "DBVDD";
	215	break;
	216
	217	case 13 ... 16:
	218	powerdomain = "TPVDD";
	219	break;
	220
	221	default:
	222	BUG();
	223	break;
	224	}
	225
f92e8f81 MB	226	tristated = reg & WM831X_GPN_TRI;
	227	if (wm831x->has_gpio_ena)
	228	tristated = !tristated;
	229
e4b736f1 MB	230	seq_printf(s, " %s %s %s %s%s\n"
	231	" %s%s (0x%4x)\n",
	232	reg & WM831X_GPN_DIR ? "in" : "out",
	233	wm831x_gpio_get(chip, i) ? "high" : "low",
	234	pull,
	235	powerdomain,
6b8274fa	236	reg & WM831X_GPN_POL ? "" : " inverted",
51c27da1	237	reg & WM831X_GPN_OD ? "open-drain" : "push-pull",
f92e8f81	238	tristated ? " tristated" : "",
e4b736f1 MB	239	reg);
	240	}
	241	}
	242	#else
	243	#define wm831x_gpio_dbg_show NULL
	244	#endif
	245
e35b5ab0	246	static const struct gpio_chip template_chip = {
e4b736f1 MB	247	.label = "wm831x",
	248	.owner = THIS_MODULE,
	249	.direction_input = wm831x_gpio_direction_in,
	250	.get = wm831x_gpio_get,
	251	.direction_output = wm831x_gpio_direction_out,
	252	.set = wm831x_gpio_set,
dc0fb25c	253	.to_irq = wm831x_gpio_to_irq,
2956b5d9	254	.set_config = wm831x_set_config,
e4b736f1	255	.dbg_show = wm831x_gpio_dbg_show,
9fb1f39e	256	.can_sleep = true,
e4b736f1 MB	257	};
e4b736f1 MB	258
3836309d	259	static int wm831x_gpio_probe(struct platform_device *pdev)
e4b736f1 MB	260	{
e4b736f1 MB	261	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
9674a8dc	262	struct wm831x_pdata *pdata = &wm831x->pdata;
e4b736f1 MB	263	struct wm831x_gpio *wm831x_gpio;
	264	int ret;
	265
718bc6e3 AL	266	wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
718bc6e3 AL	267	GFP_KERNEL);
e4b736f1 MB	268	if (wm831x_gpio == NULL)
	269	return -ENOMEM;
	270
	271	wm831x_gpio->wm831x = wm831x;
	272	wm831x_gpio->gpio_chip = template_chip;
6f2ecaae	273	wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
58383c78	274	wm831x_gpio->gpio_chip.parent = &pdev->dev;
e4b736f1 MB	275	if (pdata && pdata->gpio_base)
	276	wm831x_gpio->gpio_chip.base = pdata->gpio_base;
	277	else
	278	wm831x_gpio->gpio_chip.base = -1;
9674a8dc CK	279	#ifdef CONFIG_OF_GPIO
	280	wm831x_gpio->gpio_chip.of_node = wm831x->dev->of_node;
	281	#endif
e4b736f1	282
61da4848 LD	283	ret = devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip,
61da4848 LD	284	wm831x_gpio);
e4b736f1	285	if (ret < 0) {
718bc6e3 AL	286	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
718bc6e3 AL	287	return ret;
e4b736f1 MB	288	}
	289
	290	platform_set_drvdata(pdev, wm831x_gpio);
	291
	292	return ret;
e4b736f1 MB	293	}
e4b736f1 MB	294
e4b736f1 MB	295	static struct platform_driver wm831x_gpio_driver = {
e4b736f1 MB	296	.driver.name = "wm831x-gpio",
e4b736f1	297	.probe = wm831x_gpio_probe,
e4b736f1 MB	298	};
	299
	300	static int __init wm831x_gpio_init(void)
	301	{
	302	return platform_driver_register(&wm831x_gpio_driver);
	303	}
	304	subsys_initcall(wm831x_gpio_init);
	305
	306	static void __exit wm831x_gpio_exit(void)
	307	{
	308	platform_driver_unregister(&wm831x_gpio_driver);
	309	}
	310	module_exit(wm831x_gpio_exit);
	311
	312	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	313	MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
	314	MODULE_LICENSE("GPL");
	315	MODULE_ALIAS("platform:wm831x-gpio");