[deliverable/linux.git] / drivers / gpio / gpio-wm831x.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 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 gpio_chip *chip, unsigned offset,
				    unsigned debounce)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(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 = 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_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";
			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" : "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		= true,
};

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

	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",
	.driver.owner	= THIS_MODULE,
	.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
e4b736f1	1	/*
c103de24	2	* gpiolib support for Wolfson WM831x PMICs
e4b736f1 MB	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
e4b736f1 MB	33	static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
e4b736f1 MB	34	{
9b3c817b	35	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1	36	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81 MB	37	int val = WM831X_GPN_DIR;
	38
	39	if (wm831x->has_gpio_ena)
	40	val \|= WM831X_GPN_TRI;
e4b736f1 MB	41
e4b736f1 MB	42	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
1bca748c MB	43	WM831X_GPN_DIR \| WM831X_GPN_TRI \|
1bca748c MB	44	WM831X_GPN_FN_MASK, val);
e4b736f1 MB	45	}
	46
	47	static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
	48	{
9b3c817b	49	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1 MB	50	struct wm831x *wm831x = wm831x_gpio->wm831x;
	51	int ret;
	52
	53	ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
	54	if (ret < 0)
	55	return ret;
	56
	57	if (ret & 1 << offset)
	58	return 1;
	59	else
	60	return 0;
	61	}
	62
3383d23d	63	static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
e4b736f1	64	{
9b3c817b	65	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1 MB	66	struct wm831x *wm831x = wm831x_gpio->wm831x;
e4b736f1 MB	67
3383d23d MB	68	wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
3383d23d MB	69	value << offset);
e4b736f1 MB	70	}
e4b736f1 MB	71
3383d23d MB	72	static int wm831x_gpio_direction_out(struct gpio_chip *chip,
3383d23d MB	73	unsigned offset, int value)
e4b736f1	74	{
9b3c817b	75	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1	76	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81	77	int val = 0;
3383d23d	78	int ret;
e4b736f1	79
f92e8f81 MB	80	if (wm831x->has_gpio_ena)
	81	val \|= WM831X_GPN_TRI;
	82
3383d23d	83	ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
1bca748c MB	84	WM831X_GPN_DIR \| WM831X_GPN_TRI \|
1bca748c MB	85	WM831X_GPN_FN_MASK, val);
3383d23d MB	86	if (ret < 0)
	87	return ret;
	88
	89	/* Can only set GPIO state once it's in output mode */
	90	wm831x_gpio_set(chip, offset, value);
	91
	92	return 0;
e4b736f1 MB	93	}
e4b736f1 MB	94
dc0fb25c MB	95	static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
dc0fb25c MB	96	{
9b3c817b	97	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
dc0fb25c MB	98	struct wm831x *wm831x = wm831x_gpio->wm831x;
dc0fb25c MB	99
cd99758b MB	100	return irq_create_mapping(wm831x->irq_domain,
cd99758b MB	101	WM831X_IRQ_GPIO_1 + offset);
dc0fb25c MB	102	}
dc0fb25c MB	103
b12c35e2 MB	104	static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
	105	unsigned debounce)
	106	{
9b3c817b	107	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
b12c35e2 MB	108	struct wm831x *wm831x = wm831x_gpio->wm831x;
	109	int reg = WM831X_GPIO1_CONTROL + offset;
	110	int ret, fn;
	111
	112	ret = wm831x_reg_read(wm831x, reg);
	113	if (ret < 0)
	114	return ret;
	115
	116	switch (ret & WM831X_GPN_FN_MASK) {
	117	case 0:
	118	case 1:
	119	break;
	120	default:
	121	/* Not in GPIO mode */
	122	return -EBUSY;
	123	}
	124
	125	if (debounce >= 32 && debounce <= 64)
	126	fn = 0;
	127	else if (debounce >= 4000 && debounce <= 8000)
	128	fn = 1;
	129	else
	130	return -EINVAL;
	131
	132	return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
	133	}
	134
e4b736f1 MB	135	#ifdef CONFIG_DEBUG_FS
	136	static void wm831x_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
	137	{
9b3c817b	138	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
e4b736f1	139	struct wm831x *wm831x = wm831x_gpio->wm831x;
f92e8f81	140	int i, tristated;
e4b736f1 MB	141
	142	for (i = 0; i < chip->ngpio; i++) {
	143	int gpio = i + chip->base;
	144	int reg;
	145	const char label, pull, *powerdomain;
	146
	147	/* We report the GPIO even if it's not requested since
	148	* we're also reporting things like alternate
	149	* functions which apply even when the GPIO is not in
	150	* use as a GPIO.
	151	*/
	152	label = gpiochip_is_requested(chip, i);
	153	if (!label)
	154	label = "Unrequested";
	155
	156	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	157
	158	reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
	159	if (reg < 0) {
	160	dev_err(wm831x->dev,
	161	"GPIO control %d read failed: %d\n",
	162	gpio, reg);
	163	seq_printf(s, "\n");
	164	continue;
	165	}
	166
	167	switch (reg & WM831X_GPN_PULL_MASK) {
	168	case WM831X_GPIO_PULL_NONE:
	169	pull = "nopull";
	170	break;
	171	case WM831X_GPIO_PULL_DOWN:
	172	pull = "pulldown";
	173	break;
	174	case WM831X_GPIO_PULL_UP:
	175	pull = "pullup";
164d5c39	176	break;
e4b736f1 MB	177	default:
	178	pull = "INVALID PULL";
	179	break;
	180	}
	181
	182	switch (i + 1) {
	183	case 1 ... 3:
	184	case 7 ... 9:
	185	if (reg & WM831X_GPN_PWR_DOM)
	186	powerdomain = "VPMIC";
	187	else
	188	powerdomain = "DBVDD";
	189	break;
	190
	191	case 4 ... 6:
	192	case 10 ... 12:
	193	if (reg & WM831X_GPN_PWR_DOM)
	194	powerdomain = "SYSVDD";
	195	else
	196	powerdomain = "DBVDD";
	197	break;
	198
	199	case 13 ... 16:
	200	powerdomain = "TPVDD";
	201	break;
	202
	203	default:
	204	BUG();
	205	break;
	206	}
	207
f92e8f81 MB	208	tristated = reg & WM831X_GPN_TRI;
	209	if (wm831x->has_gpio_ena)
	210	tristated = !tristated;
	211
e4b736f1 MB	212	seq_printf(s, " %s %s %s %s%s\n"
	213	" %s%s (0x%4x)\n",
	214	reg & WM831X_GPN_DIR ? "in" : "out",
	215	wm831x_gpio_get(chip, i) ? "high" : "low",
	216	pull,
	217	powerdomain,
6b8274fa	218	reg & WM831X_GPN_POL ? "" : " inverted",
e4b736f1	219	reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
f92e8f81	220	tristated ? " tristated" : "",
e4b736f1 MB	221	reg);
	222	}
	223	}
	224	#else
	225	#define wm831x_gpio_dbg_show NULL
	226	#endif
	227
	228	static struct gpio_chip template_chip = {
	229	.label = "wm831x",
	230	.owner = THIS_MODULE,
	231	.direction_input = wm831x_gpio_direction_in,
	232	.get = wm831x_gpio_get,
	233	.direction_output = wm831x_gpio_direction_out,
	234	.set = wm831x_gpio_set,
dc0fb25c	235	.to_irq = wm831x_gpio_to_irq,
b12c35e2	236	.set_debounce = wm831x_gpio_set_debounce,
e4b736f1	237	.dbg_show = wm831x_gpio_dbg_show,
9fb1f39e	238	.can_sleep = true,
e4b736f1 MB	239	};
e4b736f1 MB	240
3836309d	241	static int wm831x_gpio_probe(struct platform_device *pdev)
e4b736f1 MB	242	{
e4b736f1 MB	243	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
e56aee18	244	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
e4b736f1 MB	245	struct wm831x_gpio *wm831x_gpio;
	246	int ret;
	247
718bc6e3 AL	248	wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
718bc6e3 AL	249	GFP_KERNEL);
e4b736f1 MB	250	if (wm831x_gpio == NULL)
	251	return -ENOMEM;
	252
	253	wm831x_gpio->wm831x = wm831x;
	254	wm831x_gpio->gpio_chip = template_chip;
6f2ecaae	255	wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
58383c78	256	wm831x_gpio->gpio_chip.parent = &pdev->dev;
e4b736f1 MB	257	if (pdata && pdata->gpio_base)
	258	wm831x_gpio->gpio_chip.base = pdata->gpio_base;
	259	else
	260	wm831x_gpio->gpio_chip.base = -1;
	261
61da4848 LD	262	ret = devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip,
61da4848 LD	263	wm831x_gpio);
e4b736f1	264	if (ret < 0) {
718bc6e3 AL	265	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
718bc6e3 AL	266	return ret;
e4b736f1 MB	267	}
	268
	269	platform_set_drvdata(pdev, wm831x_gpio);
	270
	271	return ret;
e4b736f1 MB	272	}
e4b736f1 MB	273
e4b736f1 MB	274	static struct platform_driver wm831x_gpio_driver = {
	275	.driver.name = "wm831x-gpio",
	276	.driver.owner = THIS_MODULE,
	277	.probe = wm831x_gpio_probe,
e4b736f1 MB	278	};
	279
	280	static int __init wm831x_gpio_init(void)
	281	{
	282	return platform_driver_register(&wm831x_gpio_driver);
	283	}
	284	subsys_initcall(wm831x_gpio_init);
	285
	286	static void __exit wm831x_gpio_exit(void)
	287	{
	288	platform_driver_unregister(&wm831x_gpio_driver);
	289	}
	290	module_exit(wm831x_gpio_exit);
	291
	292	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	293	MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
	294	MODULE_LICENSE("GPL");
	295	MODULE_ALIAS("platform:wm831x-gpio");