[net-next-2.6.git] / drivers / gpio / wm831x-gpio.c

/*
 * wm831x-gpio.c  --  gpiolib support for Wolfson WM831x PMICs
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio.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 inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct wm831x_gpio, gpio_chip);
}

static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(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 = to_wm831x_gpio(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 = to_wm831x_gpio(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 = to_wm831x_gpio(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 = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;

	if (!wm831x->irq_base)
		return -EINVAL;

	return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
}

static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
				    unsigned debounce)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	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);
}

#ifdef CONFIG_DEBUG_FS
static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(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_printf(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";
		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" : "CMOS",
			   tristated ? " tristated" : "",
			   reg);
	}
}
#else
#define wm831x_gpio_dbg_show NULL
#endif

static 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_debounce		= wm831x_gpio_set_debounce,
	.dbg_show		= wm831x_gpio_dbg_show,
	.can_sleep		= 1,
};

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

	wm831x_gpio = kzalloc(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.dev = &pdev->dev;
	if (pdata && pdata->gpio_base)
		wm831x_gpio->gpio_chip.base = pdata->gpio_base;
	else
		wm831x_gpio->gpio_chip.base = -1;

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

	platform_set_drvdata(pdev, wm831x_gpio);

	return ret;

err:
	kfree(wm831x_gpio);
	return ret;
}

static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
{
	struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
	int ret;

	ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
	if (ret == 0)
		kfree(wm831x_gpio);

	return ret;
}

static struct platform_driver wm831x_gpio_driver = {
	.driver.name	= "wm831x-gpio",
	.driver.owner	= THIS_MODULE,
	.probe		= wm831x_gpio_probe,
	.remove		= __devexit_p(wm831x_gpio_remove),
};

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
e4b736f1 MB	1	/*
	2	* wm831x-gpio.c -- gpiolib support for Wolfson WM831x PMICs
	3	*
	4	* Copyright 2009 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
5a0e3ad6	16	#include <linux/slab.h>
e4b736f1 MB	17	#include <linux/module.h>
	18	#include <linux/gpio.h>
	19	#include <linux/mfd/core.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/seq_file.h>
	22
	23	#include <linux/mfd/wm831x/core.h>
	24	#include <linux/mfd/wm831x/pdata.h>
	25	#include <linux/mfd/wm831x/gpio.h>
dc0fb25c	26	#include <linux/mfd/wm831x/irq.h>
e4b736f1	27
e4b736f1 MB	28	struct wm831x_gpio {
	29	struct wm831x *wm831x;
	30	struct gpio_chip gpio_chip;
	31	};
	32
	33	static inline struct wm831x_gpio to_wm831x_gpio(struct gpio_chip chip)
	34	{
	35	return container_of(chip, struct wm831x_gpio, gpio_chip);
	36	}
	37
	38	static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	39	{
	40	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	41	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81 MB	42	int val = WM831X_GPN_DIR;
	43
	44	if (wm831x->has_gpio_ena)
	45	val \|= WM831X_GPN_TRI;
e4b736f1 MB	46
e4b736f1 MB	47	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
1bca748c MB	48	WM831X_GPN_DIR \| WM831X_GPN_TRI \|
1bca748c MB	49	WM831X_GPN_FN_MASK, val);
e4b736f1 MB	50	}
	51
	52	static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
	53	{
	54	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	55	struct wm831x *wm831x = wm831x_gpio->wm831x;
	56	int ret;
	57
	58	ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
	59	if (ret < 0)
	60	return ret;
	61
	62	if (ret & 1 << offset)
	63	return 1;
	64	else
	65	return 0;
	66	}
	67
3383d23d	68	static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
e4b736f1 MB	69	{
	70	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	71	struct wm831x *wm831x = wm831x_gpio->wm831x;
	72
3383d23d MB	73	wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
3383d23d MB	74	value << offset);
e4b736f1 MB	75	}
e4b736f1 MB	76
3383d23d MB	77	static int wm831x_gpio_direction_out(struct gpio_chip *chip,
3383d23d MB	78	unsigned offset, int value)
e4b736f1 MB	79	{
	80	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	81	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81	82	int val = 0;
3383d23d	83	int ret;
e4b736f1	84
f92e8f81 MB	85	if (wm831x->has_gpio_ena)
	86	val \|= WM831X_GPN_TRI;
	87
3383d23d	88	ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
1bca748c MB	89	WM831X_GPN_DIR \| WM831X_GPN_TRI \|
1bca748c MB	90	WM831X_GPN_FN_MASK, val);
3383d23d MB	91	if (ret < 0)
	92	return ret;
	93
	94	/* Can only set GPIO state once it's in output mode */
	95	wm831x_gpio_set(chip, offset, value);
	96
	97	return 0;
e4b736f1 MB	98	}
e4b736f1 MB	99
dc0fb25c MB	100	static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	101	{
	102	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	103	struct wm831x *wm831x = wm831x_gpio->wm831x;
	104
	105	if (!wm831x->irq_base)
	106	return -EINVAL;
	107
	108	return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
	109	}
	110
b12c35e2 MB	111	static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
	112	unsigned debounce)
	113	{
	114	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	115	struct wm831x *wm831x = wm831x_gpio->wm831x;
	116	int reg = WM831X_GPIO1_CONTROL + offset;
	117	int ret, fn;
	118
	119	ret = wm831x_reg_read(wm831x, reg);
	120	if (ret < 0)
	121	return ret;
	122
	123	switch (ret & WM831X_GPN_FN_MASK) {
	124	case 0:
	125	case 1:
	126	break;
	127	default:
	128	/* Not in GPIO mode */
	129	return -EBUSY;
	130	}
	131
	132	if (debounce >= 32 && debounce <= 64)
	133	fn = 0;
	134	else if (debounce >= 4000 && debounce <= 8000)
	135	fn = 1;
	136	else
	137	return -EINVAL;
	138
	139	return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
	140	}
	141
e4b736f1 MB	142	#ifdef CONFIG_DEBUG_FS
	143	static void wm831x_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
	144	{
	145	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	146	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81	147	int i, tristated;
e4b736f1 MB	148
	149	for (i = 0; i < chip->ngpio; i++) {
	150	int gpio = i + chip->base;
	151	int reg;
	152	const char label, pull, *powerdomain;
	153
	154	/* We report the GPIO even if it's not requested since
	155	* we're also reporting things like alternate
	156	* functions which apply even when the GPIO is not in
	157	* use as a GPIO.
	158	*/
	159	label = gpiochip_is_requested(chip, i);
	160	if (!label)
	161	label = "Unrequested";
	162
	163	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	164
	165	reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
	166	if (reg < 0) {
	167	dev_err(wm831x->dev,
	168	"GPIO control %d read failed: %d\n",
	169	gpio, reg);
	170	seq_printf(s, "\n");
	171	continue;
	172	}
	173
	174	switch (reg & WM831X_GPN_PULL_MASK) {
	175	case WM831X_GPIO_PULL_NONE:
	176	pull = "nopull";
	177	break;
	178	case WM831X_GPIO_PULL_DOWN:
	179	pull = "pulldown";
	180	break;
	181	case WM831X_GPIO_PULL_UP:
	182	pull = "pullup";
	183	default:
	184	pull = "INVALID PULL";
	185	break;
	186	}
	187
	188	switch (i + 1) {
	189	case 1 ... 3:
	190	case 7 ... 9:
	191	if (reg & WM831X_GPN_PWR_DOM)
	192	powerdomain = "VPMIC";
	193	else
	194	powerdomain = "DBVDD";
	195	break;
	196
	197	case 4 ... 6:
	198	case 10 ... 12:
	199	if (reg & WM831X_GPN_PWR_DOM)
	200	powerdomain = "SYSVDD";
	201	else
	202	powerdomain = "DBVDD";
	203	break;
	204
	205	case 13 ... 16:
	206	powerdomain = "TPVDD";
	207	break;
	208
	209	default:
	210	BUG();
	211	break;
212	}
213
f92e8f81 MB	214	tristated = reg & WM831X_GPN_TRI;
	215	if (wm831x->has_gpio_ena)
	216	tristated = !tristated;
	217
e4b736f1 MB	218	seq_printf(s, " %s %s %s %s%s\n"
	219	" %s%s (0x%4x)\n",
	220	reg & WM831X_GPN_DIR ? "in" : "out",
	221	wm831x_gpio_get(chip, i) ? "high" : "low",
	222	pull,
	223	powerdomain,
6b8274fa	224	reg & WM831X_GPN_POL ? "" : " inverted",
e4b736f1	225	reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
f92e8f81	226	tristated ? " tristated" : "",
e4b736f1 MB	227	reg);
	228	}
	229	}
	230	#else
	231	#define wm831x_gpio_dbg_show NULL
	232	#endif
	233
	234	static struct gpio_chip template_chip = {
	235	.label = "wm831x",
	236	.owner = THIS_MODULE,
	237	.direction_input = wm831x_gpio_direction_in,
	238	.get = wm831x_gpio_get,
	239	.direction_output = wm831x_gpio_direction_out,
	240	.set = wm831x_gpio_set,
dc0fb25c	241	.to_irq = wm831x_gpio_to_irq,
b12c35e2	242	.set_debounce = wm831x_gpio_set_debounce,
e4b736f1 MB	243	.dbg_show = wm831x_gpio_dbg_show,
	244	.can_sleep = 1,
	245	};
	246
	247	static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
	248	{
	249	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	250	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
	251	struct wm831x_gpio *wm831x_gpio;
	252	int ret;
	253
	254	wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
	255	if (wm831x_gpio == NULL)
	256	return -ENOMEM;
	257
	258	wm831x_gpio->wm831x = wm831x;
	259	wm831x_gpio->gpio_chip = template_chip;
6f2ecaae	260	wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
e4b736f1 MB	261	wm831x_gpio->gpio_chip.dev = &pdev->dev;
	262	if (pdata && pdata->gpio_base)
	263	wm831x_gpio->gpio_chip.base = pdata->gpio_base;
	264	else
	265	wm831x_gpio->gpio_chip.base = -1;
	266
	267	ret = gpiochip_add(&wm831x_gpio->gpio_chip);
	268	if (ret < 0) {
	269	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	270	ret);
	271	goto err;
	272	}
	273
	274	platform_set_drvdata(pdev, wm831x_gpio);
	275
	276	return ret;
	277
	278	err:
	279	kfree(wm831x_gpio);
	280	return ret;
	281	}
	282
	283	static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
	284	{
	285	struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
	286	int ret;
	287
	288	ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
	289	if (ret == 0)
	290	kfree(wm831x_gpio);
	291
	292	return ret;
	293	}
	294
	295	static struct platform_driver wm831x_gpio_driver = {
	296	.driver.name = "wm831x-gpio",
	297	.driver.owner = THIS_MODULE,
	298	.probe = wm831x_gpio_probe,
	299	.remove = __devexit_p(wm831x_gpio_remove),
	300	};
	301
	302	static int __init wm831x_gpio_init(void)
	303	{
	304	return platform_driver_register(&wm831x_gpio_driver);
	305	}
	306	subsys_initcall(wm831x_gpio_init);
	307
	308	static void __exit wm831x_gpio_exit(void)
	309	{
	310	platform_driver_unregister(&wm831x_gpio_driver);
	311	}
	312	module_exit(wm831x_gpio_exit);
	313
	314	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	315	MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
	316	MODULE_LICENSE("GPL");
	317	MODULE_ALIAS("platform:wm831x-gpio");