[mirror_ubuntu-bionic-kernel.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/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, 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, 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;
}

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