[deliverable/linux.git] / drivers / gpio / gpiolib-of.c

/*
 * OF helpers for the GPIO API
 *
 * Copyright (c) 2007-2008  MontaVista Software, Inc.
 *
 * Author: Anton Vorontsov <avorontsov@ru.mvista.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/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
#include <linux/gpio/machine.h>

#include "gpiolib.h"

/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
	enum of_gpio_flags *flags;
	struct of_phandle_args gpiospec;

	struct gpio_desc *out_gpio;
};

/* Private function for resolving node pointer to gpio_chip */
static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
{
	struct gg_data *gg_data = data;
	int ret;

	if ((gc->of_node != gg_data->gpiospec.np) ||
	    (gc->of_gpio_n_cells != gg_data->gpiospec.args_count) ||
	    (!gc->of_xlate))
		return false;

	ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
	if (ret < 0) {
		/* We've found a gpio chip, but the translation failed.
		 * Store translation error in out_gpio.
		 * Return false to keep looking, as more than one gpio chip
		 * could be registered per of-node.
		 */
		gg_data->out_gpio = ERR_PTR(ret);
		return false;
	 }

	gg_data->out_gpio = gpiochip_get_desc(gc, ret);
	return true;
}

/**
 * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
 * @np:		device node to get GPIO from
 * @propname:	property name containing gpio specifier(s)
 * @index:	index of the GPIO
 * @flags:	a flags pointer to fill in
 *
 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
 * value on the error condition. If @flags is not NULL the function also fills
 * in flags for the GPIO.
 */
struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
		     const char *propname, int index, enum of_gpio_flags *flags)
{
	/* Return -EPROBE_DEFER to support probe() functions to be called
	 * later when the GPIO actually becomes available
	 */
	struct gg_data gg_data = {
		.flags = flags,
		.out_gpio = ERR_PTR(-EPROBE_DEFER)
	};
	int ret;

	/* .of_xlate might decide to not fill in the flags, so clear it. */
	if (flags)
		*flags = 0;

	ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
					 &gg_data.gpiospec);
	if (ret) {
		pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
			__func__, propname, np->full_name, index);
		return ERR_PTR(ret);
	}

	gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);

	of_node_put(gg_data.gpiospec.np);
	pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
		 __func__, propname, np->full_name, index,
		 PTR_ERR_OR_ZERO(gg_data.out_gpio));
	return gg_data.out_gpio;
}

int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
			    int index, enum of_gpio_flags *flags)
{
	struct gpio_desc *desc;

	desc = of_get_named_gpiod_flags(np, list_name, index, flags);

	if (IS_ERR(desc))
		return PTR_ERR(desc);
	else
		return desc_to_gpio(desc);
}
EXPORT_SYMBOL(of_get_named_gpio_flags);

/**
 * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
 * @np:		device node to get GPIO from
 * @name:	GPIO line name
 * @lflags:	gpio_lookup_flags - returned from of_find_gpio() or
 *		of_parse_own_gpio()
 * @dflags:	gpiod_flags - optional GPIO initialization flags
 *
 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
 * value on the error condition.
 */
static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
					   const char **name,
					   enum gpio_lookup_flags *lflags,
					   enum gpiod_flags *dflags)
{
	struct device_node *chip_np;
	enum of_gpio_flags xlate_flags;
	struct gg_data gg_data = {
		.flags = &xlate_flags,
	};
	u32 tmp;
	int i, ret;

	chip_np = np->parent;
	if (!chip_np)
		return ERR_PTR(-EINVAL);

	xlate_flags = 0;
	*lflags = 0;
	*dflags = 0;

	ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
	if (ret)
		return ERR_PTR(ret);

	if (tmp > MAX_PHANDLE_ARGS)
		return ERR_PTR(-EINVAL);

	gg_data.gpiospec.args_count = tmp;
	gg_data.gpiospec.np = chip_np;
	for (i = 0; i < tmp; i++) {
		ret = of_property_read_u32_index(np, "gpios", i,
					   &gg_data.gpiospec.args[i]);
		if (ret)
			return ERR_PTR(ret);
	}

	gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
	if (!gg_data.out_gpio) {
		if (np->parent == np)
			return ERR_PTR(-ENXIO);
		else
			return ERR_PTR(-EINVAL);
	}

	if (xlate_flags & OF_GPIO_ACTIVE_LOW)
		*lflags |= GPIO_ACTIVE_LOW;

	if (of_property_read_bool(np, "input"))
		*dflags |= GPIOD_IN;
	else if (of_property_read_bool(np, "output-low"))
		*dflags |= GPIOD_OUT_LOW;
	else if (of_property_read_bool(np, "output-high"))
		*dflags |= GPIOD_OUT_HIGH;
	else {
		pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n",
			desc_to_gpio(gg_data.out_gpio), np->name);
		return ERR_PTR(-EINVAL);
	}

	if (name && of_property_read_string(np, "line-name", name))
		*name = np->name;

	return gg_data.out_gpio;
}

/**
 * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
 * @chip:	gpio chip to act on
 *
 * This is only used by of_gpiochip_add to request/set GPIO initial
 * configuration.
 */
static void of_gpiochip_scan_gpios(struct gpio_chip *chip)
{
	struct gpio_desc *desc = NULL;
	struct device_node *np;
	const char *name;
	enum gpio_lookup_flags lflags;
	enum gpiod_flags dflags;

	for_each_child_of_node(chip->of_node, np) {
		if (!of_property_read_bool(np, "gpio-hog"))
			continue;

		desc = of_parse_own_gpio(np, &name, &lflags, &dflags);
		if (IS_ERR(desc))
			continue;

		if (gpiod_hog(desc, name, lflags, dflags))
			continue;
	}
}

/**
 * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
 * @gc:		pointer to the gpio_chip structure
 * @np:		device node of the GPIO chip
 * @gpio_spec:	gpio specifier as found in the device tree
 * @flags:	a flags pointer to fill in
 *
 * This is simple translation function, suitable for the most 1:1 mapped
 * gpio chips. This function performs only one sanity check: whether gpio
 * is less than ngpios (that is specified in the gpio_chip).
 */
int of_gpio_simple_xlate(struct gpio_chip *gc,
			 const struct of_phandle_args *gpiospec, u32 *flags)
{
	/*
	 * We're discouraging gpio_cells < 2, since that way you'll have to
	 * write your own xlate function (that will have to retrieve the GPIO
	 * number and the flags from a single gpio cell -- this is possible,
	 * but not recommended).
	 */
	if (gc->of_gpio_n_cells < 2) {
		WARN_ON(1);
		return -EINVAL;
	}

	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
		return -EINVAL;

	if (gpiospec->args[0] >= gc->ngpio)
		return -EINVAL;

	if (flags)
		*flags = gpiospec->args[1];

	return gpiospec->args[0];
}
EXPORT_SYMBOL(of_gpio_simple_xlate);

/**
 * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)
 * @np:		device node of the GPIO chip
 * @mm_gc:	pointer to the of_mm_gpio_chip allocated structure
 *
 * To use this function you should allocate and fill mm_gc with:
 *
 * 1) In the gpio_chip structure:
 *    - all the callbacks
 *    - of_gpio_n_cells
 *    - of_xlate callback (optional)
 *
 * 3) In the of_mm_gpio_chip structure:
 *    - save_regs callback (optional)
 *
 * If succeeded, this function will map bank's memory and will
 * do all necessary work for you. Then you'll able to use .regs
 * to manage GPIOs from the callbacks.
 */
int of_mm_gpiochip_add(struct device_node *np,
		       struct of_mm_gpio_chip *mm_gc)
{
	int ret = -ENOMEM;
	struct gpio_chip *gc = &mm_gc->gc;

	gc->label = kstrdup(np->full_name, GFP_KERNEL);
	if (!gc->label)
		goto err0;

	mm_gc->regs = of_iomap(np, 0);
	if (!mm_gc->regs)
		goto err1;

	gc->base = -1;

	if (mm_gc->save_regs)
		mm_gc->save_regs(mm_gc);

	mm_gc->gc.of_node = np;

	ret = gpiochip_add(gc);
	if (ret)
		goto err2;

	return 0;
err2:
	iounmap(mm_gc->regs);
err1:
	kfree(gc->label);
err0:
	pr_err("%s: GPIO chip registration failed with status %d\n",
	       np->full_name, ret);
	return ret;
}
EXPORT_SYMBOL(of_mm_gpiochip_add);

/**
 * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
 * @mm_gc:	pointer to the of_mm_gpio_chip allocated structure
 */
void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
{
	struct gpio_chip *gc = &mm_gc->gc;

	if (!mm_gc)
		return;

	gpiochip_remove(gc);
	iounmap(mm_gc->regs);
	kfree(gc->label);
}
EXPORT_SYMBOL(of_mm_gpiochip_remove);

#ifdef CONFIG_PINCTRL
static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
{
	struct device_node *np = chip->of_node;
	struct of_phandle_args pinspec;
	struct pinctrl_dev *pctldev;
	int index = 0, ret;
	const char *name;
	static const char group_names_propname[] = "gpio-ranges-group-names";
	struct property *group_names;

	if (!np)
		return 0;

	group_names = of_find_property(np, group_names_propname, NULL);

	for (;; index++) {
		ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
				index, &pinspec);
		if (ret)
			break;

		pctldev = of_pinctrl_get(pinspec.np);
		if (!pctldev)
			return -EPROBE_DEFER;

		if (pinspec.args[2]) {
			if (group_names) {
				of_property_read_string_index(np,
						group_names_propname,
						index, &name);
				if (strlen(name)) {
					pr_err("%s: Group name of numeric GPIO ranges must be the empty string.\n",
						np->full_name);
					break;
				}
			}
			/* npins != 0: linear range */
			ret = gpiochip_add_pin_range(chip,
					pinctrl_dev_get_devname(pctldev),
					pinspec.args[0],
					pinspec.args[1],
					pinspec.args[2]);
			if (ret)
				return ret;
		} else {
			/* npins == 0: special range */
			if (pinspec.args[1]) {
				pr_err("%s: Illegal gpio-range format.\n",
					np->full_name);
				break;
			}

			if (!group_names) {
				pr_err("%s: GPIO group range requested but no %s property.\n",
					np->full_name, group_names_propname);
				break;
			}

			ret = of_property_read_string_index(np,
						group_names_propname,
						index, &name);
			if (ret)
				break;

			if (!strlen(name)) {
				pr_err("%s: Group name of GPIO group range cannot be the empty string.\n",
				np->full_name);
				break;
			}

			ret = gpiochip_add_pingroup_range(chip, pctldev,
						pinspec.args[0], name);
			if (ret)
				return ret;
		}
	}

	return 0;
}

#else
static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
#endif

int of_gpiochip_add(struct gpio_chip *chip)
{
	int status;

	if ((!chip->of_node) && (chip->parent))
		chip->of_node = chip->parent->of_node;

	if (!chip->of_node)
		return 0;

	if (!chip->of_xlate) {
		chip->of_gpio_n_cells = 2;
		chip->of_xlate = of_gpio_simple_xlate;
	}

	status = of_gpiochip_add_pin_range(chip);
	if (status)
		return status;

	of_node_get(chip->of_node);

	of_gpiochip_scan_gpios(chip);

	return 0;
}

void of_gpiochip_remove(struct gpio_chip *chip)
{
	gpiochip_remove_pin_ranges(chip);
	of_node_put(chip->of_node);
}
Commit	Line	Data
863fbf49 AV	1	/*
	2	* OF helpers for the GPIO API
	3	*
	4	* Copyright (c) 2007-2008 MontaVista Software, Inc.
	5	*
	6	* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*/
	13
2e13cba8	14	#include <linux/device.h>
bea4dbee	15	#include <linux/err.h>
863fbf49	16	#include <linux/errno.h>
2e13cba8	17	#include <linux/module.h>
863fbf49	18	#include <linux/io.h>
af8b6375	19	#include <linux/gpio/consumer.h>
863fbf49	20	#include <linux/of.h>
2e13cba8	21	#include <linux/of_address.h>
863fbf49	22	#include <linux/of_gpio.h>
f23f1516	23	#include <linux/pinctrl/pinctrl.h>
2e13cba8	24	#include <linux/slab.h>
f625d460	25	#include <linux/gpio/machine.h>
863fbf49	26
1bd6b601	27	#include "gpiolib.h"
af8b6375	28
0df2c999	29	/* Private data structure for of_gpiochip_find_and_xlate */
3d0f7cf0 GL	30	struct gg_data {
	31	enum of_gpio_flags *flags;
	32	struct of_phandle_args gpiospec;
	33
af8b6375	34	struct gpio_desc *out_gpio;
3d0f7cf0 GL	35	};
	36
	37	/* Private function for resolving node pointer to gpio_chip */
	38	static int of_gpiochip_find_and_xlate(struct gpio_chip gc, void data)
	39	{
	40	struct gg_data *gg_data = data;
	41	int ret;
	42
	43	if ((gc->of_node != gg_data->gpiospec.np) \|\|
	44	(gc->of_gpio_n_cells != gg_data->gpiospec.args_count) \|\|
	45	(!gc->of_xlate))
	46	return false;
	47
	48	ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
7b8792bb	49	if (ret < 0) {
9cf75e9e HH	50	/* We've found a gpio chip, but the translation failed.
	51	* Store translation error in out_gpio.
	52	* Return false to keep looking, as more than one gpio chip
	53	* could be registered per of-node.
7b8792bb HH	54	*/
7b8792bb HH	55	gg_data->out_gpio = ERR_PTR(ret);
9cf75e9e	56	return false;
7b8792bb	57	}
3d0f7cf0	58
ccd9726e	59	gg_data->out_gpio = gpiochip_get_desc(gc, ret);
3d0f7cf0 GL	60	return true;
	61	}
	62
863fbf49	63	/**
af8b6375	64	* of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
863fbf49	65	* @np: device node to get GPIO from
a6b09191	66	* @propname: property name containing gpio specifier(s)
863fbf49	67	* @index: index of the GPIO
b908b53d	68	* @flags: a flags pointer to fill in
863fbf49	69	*
af8b6375	70	* Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
b908b53d AV	71	* value on the error condition. If @flags is not NULL the function also fills
b908b53d AV	72	* in flags for the GPIO.
863fbf49	73	*/
af8b6375 AC	74	struct gpio_desc of_get_named_gpiod_flags(struct device_node np,
af8b6375 AC	75	const char propname, int index, enum of_gpio_flags flags)
863fbf49	76	{
4fbb0022 RS	77	/* Return -EPROBE_DEFER to support probe() functions to be called
	78	* later when the GPIO actually becomes available
	79	*/
af8b6375 AC	80	struct gg_data gg_data = {
	81	.flags = flags,
	82	.out_gpio = ERR_PTR(-EPROBE_DEFER)
	83	};
64b60e09	84	int ret;
3d0f7cf0 GL	85
	86	/* .of_xlate might decide to not fill in the flags, so clear it. */
	87	if (flags)
	88	*flags = 0;
863fbf49	89
15c9a0ac	90	ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
3d0f7cf0	91	&gg_data.gpiospec);
64b60e09	92	if (ret) {
85ea29ac TB	93	pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
85ea29ac TB	94	__func__, propname, np->full_name, index);
af8b6375	95	return ERR_PTR(ret);
863fbf49 AV	96	}
863fbf49 AV	97
3d0f7cf0	98	gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
863fbf49	99
3d0f7cf0	100	of_node_put(gg_data.gpiospec.np);
85ea29ac TB	101	pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
85ea29ac TB	102	__func__, propname, np->full_name, index,
bea4dbee	103	PTR_ERR_OR_ZERO(gg_data.out_gpio));
3d0f7cf0	104	return gg_data.out_gpio;
863fbf49	105	}
863fbf49	106
f01d9075 AC	107	int of_get_named_gpio_flags(struct device_node np, const char list_name,
	108	int index, enum of_gpio_flags *flags)
	109	{
	110	struct gpio_desc *desc;
	111
	112	desc = of_get_named_gpiod_flags(np, list_name, index, flags);
	113
	114	if (IS_ERR(desc))
	115	return PTR_ERR(desc);
	116	else
	117	return desc_to_gpio(desc);
	118	}
	119	EXPORT_SYMBOL(of_get_named_gpio_flags);
	120
f625d460	121	/**
fd7337fd	122	* of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
f625d460 BP	123	* @np: device node to get GPIO from
	124	* @name: GPIO line name
	125	* @lflags: gpio_lookup_flags - returned from of_find_gpio() or
fd7337fd	126	* of_parse_own_gpio()
f625d460 BP	127	* @dflags: gpiod_flags - optional GPIO initialization flags
	128	*
	129	* Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
	130	* value on the error condition.
	131	*/
fd7337fd MP	132	static struct gpio_desc of_parse_own_gpio(struct device_node np,
	133	const char **name,
	134	enum gpio_lookup_flags *lflags,
	135	enum gpiod_flags *dflags)
f625d460 BP	136	{
	137	struct device_node *chip_np;
	138	enum of_gpio_flags xlate_flags;
f625d460 BP	139	struct gg_data gg_data = {
	140	.flags = &xlate_flags,
	141	};
	142	u32 tmp;
	143	int i, ret;
	144
	145	chip_np = np->parent;
	146	if (!chip_np)
	147	return ERR_PTR(-EINVAL);
	148
	149	xlate_flags = 0;
	150	*lflags = 0;
	151	*dflags = 0;
	152
	153	ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
	154	if (ret)
	155	return ERR_PTR(ret);
	156
	157	if (tmp > MAX_PHANDLE_ARGS)
	158	return ERR_PTR(-EINVAL);
	159
	160	gg_data.gpiospec.args_count = tmp;
	161	gg_data.gpiospec.np = chip_np;
	162	for (i = 0; i < tmp; i++) {
	163	ret = of_property_read_u32_index(np, "gpios", i,
	164	&gg_data.gpiospec.args[i]);
	165	if (ret)
	166	return ERR_PTR(ret);
	167	}
	168
	169	gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
	170	if (!gg_data.out_gpio) {
	171	if (np->parent == np)
	172	return ERR_PTR(-ENXIO);
	173	else
	174	return ERR_PTR(-EINVAL);
	175	}
	176
	177	if (xlate_flags & OF_GPIO_ACTIVE_LOW)
	178	*lflags \|= GPIO_ACTIVE_LOW;
	179
	180	if (of_property_read_bool(np, "input"))
	181	*dflags \|= GPIOD_IN;
	182	else if (of_property_read_bool(np, "output-low"))
	183	*dflags \|= GPIOD_OUT_LOW;
	184	else if (of_property_read_bool(np, "output-high"))
	185	*dflags \|= GPIOD_OUT_HIGH;
	186	else {
	187	pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n",
	188	desc_to_gpio(gg_data.out_gpio), np->name);
	189	return ERR_PTR(-EINVAL);
	190	}
	191
	192	if (name && of_property_read_string(np, "line-name", name))
	193	*name = np->name;
	194
39561e8b	195	return gg_data.out_gpio;
f625d460 BP	196	}
	197
	198	/**
fd7337fd	199	* of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
f625d460 BP	200	* @chip: gpio chip to act on
	201	*
	202	* This is only used by of_gpiochip_add to request/set GPIO initial
	203	* configuration.
	204	*/
fd7337fd	205	static void of_gpiochip_scan_gpios(struct gpio_chip *chip)
f625d460 BP	206	{
	207	struct gpio_desc *desc = NULL;
	208	struct device_node *np;
	209	const char *name;
	210	enum gpio_lookup_flags lflags;
	211	enum gpiod_flags dflags;
	212
	213	for_each_child_of_node(chip->of_node, np) {
	214	if (!of_property_read_bool(np, "gpio-hog"))
	215	continue;
	216
fd7337fd	217	desc = of_parse_own_gpio(np, &name, &lflags, &dflags);
f625d460 BP	218	if (IS_ERR(desc))
	219	continue;
	220
	221	if (gpiod_hog(desc, name, lflags, dflags))
	222	continue;
	223	}
	224	}
	225
863fbf49	226	/**
b908b53d	227	* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
a19e3da5	228	* @gc: pointer to the gpio_chip structure
863fbf49 AV	229	* @np: device node of the GPIO chip
863fbf49 AV	230	* @gpio_spec: gpio specifier as found in the device tree
b908b53d	231	* @flags: a flags pointer to fill in
863fbf49 AV	232	*
	233	* This is simple translation function, suitable for the most 1:1 mapped
	234	* gpio chips. This function performs only one sanity check: whether gpio
	235	* is less than ngpios (that is specified in the gpio_chip).
	236	*/
15c9a0ac GL	237	int of_gpio_simple_xlate(struct gpio_chip *gc,
15c9a0ac GL	238	const struct of_phandle_args gpiospec, u32 flags)
863fbf49	239	{
b908b53d AV	240	/*
b908b53d AV	241	* We're discouraging gpio_cells < 2, since that way you'll have to
20a8a968	242	* write your own xlate function (that will have to retrieve the GPIO
b908b53d AV	243	* number and the flags from a single gpio cell -- this is possible,
	244	* but not recommended).
	245	*/
a19e3da5	246	if (gc->of_gpio_n_cells < 2) {
b908b53d AV	247	WARN_ON(1);
	248	return -EINVAL;
	249	}
	250
15c9a0ac GL	251	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
	252	return -EINVAL;
	253
6270d830	254	if (gpiospec->args[0] >= gc->ngpio)
863fbf49 AV	255	return -EINVAL;
863fbf49 AV	256
b908b53d	257	if (flags)
15c9a0ac	258	*flags = gpiospec->args[1];
b908b53d	259
15c9a0ac	260	return gpiospec->args[0];
863fbf49	261	}
3038bbdf	262	EXPORT_SYMBOL(of_gpio_simple_xlate);
863fbf49	263
863fbf49 AV	264	/**
	265	* of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)
	266	* @np: device node of the GPIO chip
	267	* @mm_gc: pointer to the of_mm_gpio_chip allocated structure
	268	*
	269	* To use this function you should allocate and fill mm_gc with:
	270	*
	271	* 1) In the gpio_chip structure:
	272	* - all the callbacks
a19e3da5 AV	273	* - of_gpio_n_cells
a19e3da5 AV	274	* - of_xlate callback (optional)
863fbf49 AV	275	*
	276	* 3) In the of_mm_gpio_chip structure:
	277	* - save_regs callback (optional)
	278	*
	279	* If succeeded, this function will map bank's memory and will
	280	* do all necessary work for you. Then you'll able to use .regs
	281	* to manage GPIOs from the callbacks.
	282	*/
	283	int of_mm_gpiochip_add(struct device_node *np,
	284	struct of_mm_gpio_chip *mm_gc)
	285	{
	286	int ret = -ENOMEM;
a19e3da5	287	struct gpio_chip *gc = &mm_gc->gc;
863fbf49 AV	288
	289	gc->label = kstrdup(np->full_name, GFP_KERNEL);
	290	if (!gc->label)
	291	goto err0;
	292
	293	mm_gc->regs = of_iomap(np, 0);
	294	if (!mm_gc->regs)
	295	goto err1;
	296
21451155	297	gc->base = -1;
863fbf49	298
863fbf49 AV	299	if (mm_gc->save_regs)
	300	mm_gc->save_regs(mm_gc);
	301
a19e3da5	302	mm_gc->gc.of_node = np;
863fbf49 AV	303
	304	ret = gpiochip_add(gc);
	305	if (ret)
	306	goto err2;
	307
863fbf49 AV	308	return 0;
863fbf49 AV	309	err2:
863fbf49 AV	310	iounmap(mm_gc->regs);
	311	err1:
	312	kfree(gc->label);
	313	err0:
	314	pr_err("%s: GPIO chip registration failed with status %d\n",
	315	np->full_name, ret);
	316	return ret;
	317	}
	318	EXPORT_SYMBOL(of_mm_gpiochip_add);
594fa265	319
d621e8ba RRD	320	/**
	321	* of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
	322	* @mm_gc: pointer to the of_mm_gpio_chip allocated structure
	323	*/
	324	void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
	325	{
	326	struct gpio_chip *gc = &mm_gc->gc;
	327
	328	if (!mm_gc)
	329	return;
	330
	331	gpiochip_remove(gc);
	332	iounmap(mm_gc->regs);
	333	kfree(gc->label);
	334	}
	335	EXPORT_SYMBOL(of_mm_gpiochip_remove);
	336
f23f1516	337	#ifdef CONFIG_PINCTRL
28355f81	338	static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
f23f1516 SH	339	{
f23f1516 SH	340	struct device_node *np = chip->of_node;
f23f1516	341	struct of_phandle_args pinspec;
1e63d7b9	342	struct pinctrl_dev *pctldev;
f23f1516	343	int index = 0, ret;
586a87e6 CR	344	const char *name;
	345	static const char group_names_propname[] = "gpio-ranges-group-names";
	346	struct property *group_names;
f23f1516 SH	347
f23f1516 SH	348	if (!np)
28355f81	349	return 0;
f23f1516	350
586a87e6 CR	351	group_names = of_find_property(np, group_names_propname, NULL);
586a87e6 CR	352
ad4e1a7c	353	for (;; index++) {
d9fe0039 SW	354	ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
d9fe0039 SW	355	index, &pinspec);
f23f1516 SH	356	if (ret)
	357	break;
	358
1e63d7b9 LW	359	pctldev = of_pinctrl_get(pinspec.np);
1e63d7b9 LW	360	if (!pctldev)
28355f81	361	return -EPROBE_DEFER;
f23f1516	362
586a87e6 CR	363	if (pinspec.args[2]) {
586a87e6 CR	364	if (group_names) {
72858602	365	of_property_read_string_index(np,
586a87e6 CR	366	group_names_propname,
	367	index, &name);
	368	if (strlen(name)) {
	369	pr_err("%s: Group name of numeric GPIO ranges must be the empty string.\n",
	370	np->full_name);
	371	break;
	372	}
	373	}
	374	/* npins != 0: linear range */
	375	ret = gpiochip_add_pin_range(chip,
	376	pinctrl_dev_get_devname(pctldev),
	377	pinspec.args[0],
	378	pinspec.args[1],
	379	pinspec.args[2]);
	380	if (ret)
28355f81	381	return ret;
586a87e6 CR	382	} else {
	383	/* npins == 0: special range */
	384	if (pinspec.args[1]) {
	385	pr_err("%s: Illegal gpio-range format.\n",
	386	np->full_name);
	387	break;
	388	}
	389
	390	if (!group_names) {
	391	pr_err("%s: GPIO group range requested but no %s property.\n",
	392	np->full_name, group_names_propname);
	393	break;
	394	}
	395
	396	ret = of_property_read_string_index(np,
	397	group_names_propname,
	398	index, &name);
	399	if (ret)
	400	break;
	401
	402	if (!strlen(name)) {
	403	pr_err("%s: Group name of GPIO group range cannot be the empty string.\n",
	404	np->full_name);
	405	break;
	406	}
	407
	408	ret = gpiochip_add_pingroup_range(chip, pctldev,
	409	pinspec.args[0], name);
	410	if (ret)
28355f81	411	return ret;
586a87e6	412	}
ad4e1a7c	413	}
28355f81 TV	414
28355f81 TV	415	return 0;
f23f1516 SH	416	}
f23f1516 SH	417
f23f1516	418	#else
28355f81	419	static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
f23f1516 SH	420	#endif
f23f1516 SH	421
28355f81	422	int of_gpiochip_add(struct gpio_chip *chip)
391c970c	423	{
28355f81 TV	424	int status;
28355f81 TV	425
58383c78 LW	426	if ((!chip->of_node) && (chip->parent))
58383c78 LW	427	chip->of_node = chip->parent->of_node;
391c970c AV	428
391c970c AV	429	if (!chip->of_node)
28355f81	430	return 0;
391c970c AV	431
	432	if (!chip->of_xlate) {
	433	chip->of_gpio_n_cells = 2;
	434	chip->of_xlate = of_gpio_simple_xlate;
	435	}
	436
28355f81 TV	437	status = of_gpiochip_add_pin_range(chip);
	438	if (status)
	439	return status;
	440
391c970c	441	of_node_get(chip->of_node);
f625d460	442
fd7337fd	443	of_gpiochip_scan_gpios(chip);
28355f81 TV	444
28355f81 TV	445	return 0;
391c970c AV	446	}
	447
	448	void of_gpiochip_remove(struct gpio_chip *chip)
	449	{
e93fa3f2	450	gpiochip_remove_pin_ranges(chip);
8a691550	451	of_node_put(chip->of_node);
391c970c	452	}