2008-04-11 13:06:45 +00:00
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/*
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* OF helpers for the GPIO API
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*
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* Copyright (c) 2007-2008 MontaVista Software, Inc.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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2010-07-05 22:11:55 +00:00
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#include <linux/device.h>
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2014-01-27 06:45:08 +00:00
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#include <linux/err.h>
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2008-04-11 13:06:45 +00:00
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#include <linux/errno.h>
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2010-07-05 22:11:55 +00:00
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#include <linux/module.h>
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2008-04-11 13:06:45 +00:00
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#include <linux/io.h>
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2013-10-17 17:21:37 +00:00
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#include <linux/gpio/consumer.h>
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2008-04-11 13:06:45 +00:00
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#include <linux/of.h>
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2010-07-05 22:11:55 +00:00
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#include <linux/of_address.h>
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2008-04-11 13:06:45 +00:00
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#include <linux/of_gpio.h>
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2012-10-27 09:51:36 +00:00
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#include <linux/pinctrl/pinctrl.h>
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2010-07-05 22:11:55 +00:00
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#include <linux/slab.h>
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2015-02-02 17:44:44 +00:00
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#include <linux/gpio/machine.h>
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2008-04-11 13:06:45 +00:00
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2014-07-22 07:17:41 +00:00
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#include "gpiolib.h"
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2013-10-17 17:21:37 +00:00
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2016-10-25 01:47:44 +00:00
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static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data)
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2012-05-17 19:54:40 +00:00
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{
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2016-10-25 01:47:44 +00:00
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struct of_phandle_args *gpiospec = data;
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return chip->gpiodev->dev.of_node == gpiospec->np &&
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chip->of_xlate(chip, gpiospec, NULL) >= 0;
|
gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
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|
|
}
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2012-05-17 19:54:40 +00:00
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|
2016-10-25 01:47:44 +00:00
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static struct gpio_chip *of_find_gpiochip_by_xlate(
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struct of_phandle_args *gpiospec)
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gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
|
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{
|
2016-10-25 01:47:44 +00:00
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return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate);
|
2012-05-17 19:54:40 +00:00
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}
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|
2016-06-14 10:07:07 +00:00
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static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
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struct of_phandle_args *gpiospec,
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enum of_gpio_flags *flags)
|
2012-05-17 19:54:40 +00:00
|
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|
{
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int ret;
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|
2016-06-14 10:07:07 +00:00
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if (chip->of_gpio_n_cells != gpiospec->args_count)
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return ERR_PTR(-EINVAL);
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ret = chip->of_xlate(chip, gpiospec, flags);
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if (ret < 0)
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return ERR_PTR(ret);
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return gpiochip_get_desc(chip, ret);
|
2012-05-17 19:54:40 +00:00
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}
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|
2008-04-11 13:06:45 +00:00
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/**
|
2013-10-17 17:21:37 +00:00
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* of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
|
2008-04-11 13:06:45 +00:00
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* @np: device node to get GPIO from
|
2011-06-27 23:49:57 +00:00
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* @propname: property name containing gpio specifier(s)
|
2008-04-11 13:06:45 +00:00
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* @index: index of the GPIO
|
2008-12-01 06:30:04 +00:00
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* @flags: a flags pointer to fill in
|
2008-04-11 13:06:45 +00:00
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*
|
2013-10-17 17:21:37 +00:00
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* Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
|
2008-12-01 06:30:04 +00:00
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* value on the error condition. If @flags is not NULL the function also fills
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* in flags for the GPIO.
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2008-04-11 13:06:45 +00:00
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*/
|
2013-10-17 17:21:37 +00:00
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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *propname, int index, enum of_gpio_flags *flags)
|
2008-04-11 13:06:45 +00:00
|
|
|
{
|
gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
|
|
|
struct of_phandle_args gpiospec;
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struct gpio_chip *chip;
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struct gpio_desc *desc;
|
2008-10-10 04:43:17 +00:00
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int ret;
|
2012-05-17 19:54:40 +00:00
|
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|
2011-12-12 16:25:57 +00:00
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ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
|
gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
|
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&gpiospec);
|
2008-10-10 04:43:17 +00:00
|
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|
if (ret) {
|
2014-07-04 09:52:09 +00:00
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pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
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__func__, propname, np->full_name, index);
|
2013-10-17 17:21:37 +00:00
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return ERR_PTR(ret);
|
2008-04-11 13:06:45 +00:00
|
|
|
}
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|
2016-10-25 01:47:44 +00:00
|
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chip = of_find_gpiochip_by_xlate(&gpiospec);
|
gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
|
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if (!chip) {
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desc = ERR_PTR(-EPROBE_DEFER);
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goto out;
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}
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2016-06-14 10:07:07 +00:00
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desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags);
|
gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
|
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|
if (IS_ERR(desc))
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goto out;
|
2008-04-11 13:06:45 +00:00
|
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|
2014-07-04 09:52:09 +00:00
|
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pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
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__func__, propname, np->full_name, index,
|
gpio: of: remove of_gpiochip_and_xlate() and struct gg_data
The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-14 10:07:06 +00:00
|
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PTR_ERR_OR_ZERO(desc));
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out:
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of_node_put(gpiospec.np);
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return desc;
|
2008-04-11 13:06:45 +00:00
|
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}
|
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|
2014-05-17 05:54:50 +00:00
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int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
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int index, enum of_gpio_flags *flags)
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{
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struct gpio_desc *desc;
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desc = of_get_named_gpiod_flags(np, list_name, index, flags);
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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else
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return desc_to_gpio(desc);
|
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|
|
}
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EXPORT_SYMBOL(of_get_named_gpio_flags);
|
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|
2016-10-03 08:09:40 +00:00
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struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
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unsigned int idx,
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enum gpio_lookup_flags *flags)
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|
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{
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char prop_name[32]; /* 32 is max size of property name */
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enum of_gpio_flags of_flags;
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struct gpio_desc *desc;
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
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if (con_id)
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snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id,
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|
|
gpio_suffixes[i]);
|
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|
|
else
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|
snprintf(prop_name, sizeof(prop_name), "%s",
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|
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gpio_suffixes[i]);
|
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|
|
|
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desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx,
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&of_flags);
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if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
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break;
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}
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if (IS_ERR(desc))
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|
return desc;
|
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|
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|
if (of_flags & OF_GPIO_ACTIVE_LOW)
|
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|
|
*flags |= GPIO_ACTIVE_LOW;
|
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|
|
|
|
|
|
if (of_flags & OF_GPIO_SINGLE_ENDED) {
|
|
|
|
if (of_flags & OF_GPIO_ACTIVE_LOW)
|
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|
|
*flags |= GPIO_OPEN_DRAIN;
|
|
|
|
else
|
|
|
|
*flags |= GPIO_OPEN_SOURCE;
|
|
|
|
}
|
|
|
|
|
|
|
|
return desc;
|
|
|
|
}
|
|
|
|
|
2015-02-02 17:44:44 +00:00
|
|
|
/**
|
2015-08-14 14:10:58 +00:00
|
|
|
* of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
|
2015-02-02 17:44:44 +00:00
|
|
|
* @np: device node to get GPIO from
|
2016-06-14 10:07:04 +00:00
|
|
|
* @chip: GPIO chip whose hog is parsed
|
2015-02-02 17:44:44 +00:00
|
|
|
* @name: GPIO line name
|
|
|
|
* @lflags: gpio_lookup_flags - returned from of_find_gpio() or
|
2015-08-14 14:10:58 +00:00
|
|
|
* of_parse_own_gpio()
|
2015-02-02 17:44:44 +00:00
|
|
|
* @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.
|
|
|
|
*/
|
2015-08-14 14:10:58 +00:00
|
|
|
static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
|
2016-06-14 10:07:04 +00:00
|
|
|
struct gpio_chip *chip,
|
2015-08-14 14:10:58 +00:00
|
|
|
const char **name,
|
|
|
|
enum gpio_lookup_flags *lflags,
|
|
|
|
enum gpiod_flags *dflags)
|
2015-02-02 17:44:44 +00:00
|
|
|
{
|
|
|
|
struct device_node *chip_np;
|
|
|
|
enum of_gpio_flags xlate_flags;
|
2016-06-14 10:07:04 +00:00
|
|
|
struct of_phandle_args gpiospec;
|
|
|
|
struct gpio_desc *desc;
|
2015-02-02 17:44:44 +00:00
|
|
|
u32 tmp;
|
2016-06-14 10:07:03 +00:00
|
|
|
int ret;
|
2015-02-02 17:44:44 +00:00
|
|
|
|
2016-06-14 10:07:04 +00:00
|
|
|
chip_np = chip->of_node;
|
2015-02-02 17:44:44 +00:00
|
|
|
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);
|
|
|
|
|
2016-06-14 10:07:04 +00:00
|
|
|
gpiospec.np = chip_np;
|
|
|
|
gpiospec.args_count = tmp;
|
2015-02-02 17:44:44 +00:00
|
|
|
|
2016-06-14 10:07:04 +00:00
|
|
|
ret = of_property_read_u32_array(np, "gpios", gpiospec.args, tmp);
|
2016-06-14 10:07:03 +00:00
|
|
|
if (ret)
|
|
|
|
return ERR_PTR(ret);
|
2015-02-02 17:44:44 +00:00
|
|
|
|
2016-06-14 10:07:07 +00:00
|
|
|
desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags);
|
2016-06-14 10:07:04 +00:00
|
|
|
if (IS_ERR(desc))
|
|
|
|
return desc;
|
2015-02-02 17:44:44 +00:00
|
|
|
|
|
|
|
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",
|
2016-06-14 10:07:04 +00:00
|
|
|
desc_to_gpio(desc), np->name);
|
2015-02-02 17:44:44 +00:00
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (name && of_property_read_string(np, "line-name", name))
|
|
|
|
*name = np->name;
|
|
|
|
|
2016-06-14 10:07:04 +00:00
|
|
|
return desc;
|
2015-02-02 17:44:44 +00:00
|
|
|
}
|
|
|
|
|
2016-04-19 13:26:26 +00:00
|
|
|
/**
|
|
|
|
* of_gpiochip_set_names() - set up the names of the lines
|
|
|
|
* @chip: GPIO chip whose lines should be named, if possible
|
|
|
|
*/
|
|
|
|
static void of_gpiochip_set_names(struct gpio_chip *gc)
|
|
|
|
{
|
|
|
|
struct gpio_device *gdev = gc->gpiodev;
|
|
|
|
struct device_node *np = gc->of_node;
|
|
|
|
int i;
|
|
|
|
int nstrings;
|
|
|
|
|
|
|
|
nstrings = of_property_count_strings(np, "gpio-line-names");
|
|
|
|
if (nstrings <= 0)
|
|
|
|
/* Lines names not present */
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* This is normally not what you want */
|
|
|
|
if (gdev->ngpio != nstrings)
|
|
|
|
dev_info(&gdev->dev, "gpio-line-names specifies %d line "
|
|
|
|
"names but there are %d lines on the chip\n",
|
|
|
|
nstrings, gdev->ngpio);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Make sure to not index beyond the end of the number of descriptors
|
|
|
|
* of the GPIO device.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < gdev->ngpio; i++) {
|
|
|
|
const char *name;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = of_property_read_string_index(np,
|
|
|
|
"gpio-line-names",
|
|
|
|
i,
|
|
|
|
&name);
|
|
|
|
if (ret) {
|
|
|
|
if (ret != -ENODATA)
|
|
|
|
dev_err(&gdev->dev,
|
|
|
|
"unable to name line %d: %d\n",
|
|
|
|
i, ret);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
gdev->descs[i].name = name;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-02-02 17:44:44 +00:00
|
|
|
/**
|
2015-08-14 14:10:58 +00:00
|
|
|
* of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
|
2015-02-02 17:44:44 +00:00
|
|
|
* @chip: gpio chip to act on
|
|
|
|
*
|
|
|
|
* This is only used by of_gpiochip_add to request/set GPIO initial
|
|
|
|
* configuration.
|
2016-03-11 13:43:22 +00:00
|
|
|
* It retures error if it fails otherwise 0 on success.
|
2015-02-02 17:44:44 +00:00
|
|
|
*/
|
2016-03-11 13:43:22 +00:00
|
|
|
static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
|
2015-02-02 17:44:44 +00:00
|
|
|
{
|
|
|
|
struct gpio_desc *desc = NULL;
|
|
|
|
struct device_node *np;
|
|
|
|
const char *name;
|
|
|
|
enum gpio_lookup_flags lflags;
|
|
|
|
enum gpiod_flags dflags;
|
2016-03-11 13:43:22 +00:00
|
|
|
int ret;
|
2015-02-02 17:44:44 +00:00
|
|
|
|
2016-03-11 13:43:20 +00:00
|
|
|
for_each_available_child_of_node(chip->of_node, np) {
|
2015-02-02 17:44:44 +00:00
|
|
|
if (!of_property_read_bool(np, "gpio-hog"))
|
|
|
|
continue;
|
|
|
|
|
2016-06-14 10:07:04 +00:00
|
|
|
desc = of_parse_own_gpio(np, chip, &name, &lflags, &dflags);
|
2015-02-02 17:44:44 +00:00
|
|
|
if (IS_ERR(desc))
|
|
|
|
continue;
|
|
|
|
|
2016-03-11 13:43:22 +00:00
|
|
|
ret = gpiod_hog(desc, name, lflags, dflags);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
2015-02-02 17:44:44 +00:00
|
|
|
}
|
2016-03-11 13:43:22 +00:00
|
|
|
|
|
|
|
return 0;
|
2015-02-02 17:44:44 +00:00
|
|
|
}
|
|
|
|
|
2008-04-11 13:06:45 +00:00
|
|
|
/**
|
2008-12-01 06:30:04 +00:00
|
|
|
* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
|
2010-06-08 13:48:16 +00:00
|
|
|
* @gc: pointer to the gpio_chip structure
|
2008-04-11 13:06:45 +00:00
|
|
|
* @np: device node of the GPIO chip
|
|
|
|
* @gpio_spec: gpio specifier as found in the device tree
|
2008-12-01 06:30:04 +00:00
|
|
|
* @flags: a flags pointer to fill in
|
2008-04-11 13:06:45 +00:00
|
|
|
*
|
|
|
|
* 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).
|
|
|
|
*/
|
2011-12-12 16:25:57 +00:00
|
|
|
int of_gpio_simple_xlate(struct gpio_chip *gc,
|
|
|
|
const struct of_phandle_args *gpiospec, u32 *flags)
|
2008-04-11 13:06:45 +00:00
|
|
|
{
|
2008-12-01 06:30:04 +00:00
|
|
|
/*
|
|
|
|
* We're discouraging gpio_cells < 2, since that way you'll have to
|
2015-05-18 18:41:43 +00:00
|
|
|
* write your own xlate function (that will have to retrieve the GPIO
|
2008-12-01 06:30:04 +00:00
|
|
|
* number and the flags from a single gpio cell -- this is possible,
|
|
|
|
* but not recommended).
|
|
|
|
*/
|
2010-06-08 13:48:16 +00:00
|
|
|
if (gc->of_gpio_n_cells < 2) {
|
2008-12-01 06:30:04 +00:00
|
|
|
WARN_ON(1);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2011-12-12 16:25:57 +00:00
|
|
|
if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2012-04-04 00:02:58 +00:00
|
|
|
if (gpiospec->args[0] >= gc->ngpio)
|
2008-04-11 13:06:45 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
2008-12-01 06:30:04 +00:00
|
|
|
if (flags)
|
2011-12-12 16:25:57 +00:00
|
|
|
*flags = gpiospec->args[1];
|
2008-12-01 06:30:04 +00:00
|
|
|
|
2011-12-12 16:25:57 +00:00
|
|
|
return gpiospec->args[0];
|
2008-04-11 13:06:45 +00:00
|
|
|
}
|
2011-07-28 15:25:41 +00:00
|
|
|
EXPORT_SYMBOL(of_gpio_simple_xlate);
|
2008-04-11 13:06:45 +00:00
|
|
|
|
|
|
|
/**
|
2015-12-04 14:13:53 +00:00
|
|
|
* of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank)
|
2008-04-11 13:06:45 +00:00
|
|
|
* @np: device node of the GPIO chip
|
|
|
|
* @mm_gc: pointer to the of_mm_gpio_chip allocated structure
|
2015-12-04 14:13:53 +00:00
|
|
|
* @data: driver data to store in the struct gpio_chip
|
2008-04-11 13:06:45 +00:00
|
|
|
*
|
|
|
|
* To use this function you should allocate and fill mm_gc with:
|
|
|
|
*
|
|
|
|
* 1) In the gpio_chip structure:
|
|
|
|
* - all the callbacks
|
2010-06-08 13:48:16 +00:00
|
|
|
* - of_gpio_n_cells
|
|
|
|
* - of_xlate callback (optional)
|
2008-04-11 13:06:45 +00:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
2015-12-04 14:13:53 +00:00
|
|
|
int of_mm_gpiochip_add_data(struct device_node *np,
|
|
|
|
struct of_mm_gpio_chip *mm_gc,
|
|
|
|
void *data)
|
2008-04-11 13:06:45 +00:00
|
|
|
{
|
|
|
|
int ret = -ENOMEM;
|
2010-06-08 13:48:16 +00:00
|
|
|
struct gpio_chip *gc = &mm_gc->gc;
|
2008-04-11 13:06:45 +00:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2008-04-29 14:05:24 +00:00
|
|
|
gc->base = -1;
|
2008-04-11 13:06:45 +00:00
|
|
|
|
|
|
|
if (mm_gc->save_regs)
|
|
|
|
mm_gc->save_regs(mm_gc);
|
|
|
|
|
2010-06-08 13:48:16 +00:00
|
|
|
mm_gc->gc.of_node = np;
|
2008-04-11 13:06:45 +00:00
|
|
|
|
2015-12-04 14:13:53 +00:00
|
|
|
ret = gpiochip_add_data(gc, data);
|
2008-04-11 13:06:45 +00:00
|
|
|
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;
|
|
|
|
}
|
2015-12-04 14:13:53 +00:00
|
|
|
EXPORT_SYMBOL(of_mm_gpiochip_add_data);
|
2010-06-08 13:48:16 +00:00
|
|
|
|
2014-12-17 15:51:13 +00:00
|
|
|
/**
|
|
|
|
* 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);
|
|
|
|
|
2012-10-27 09:51:36 +00:00
|
|
|
#ifdef CONFIG_PINCTRL
|
2015-07-14 08:29:54 +00:00
|
|
|
static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
|
2012-10-27 09:51:36 +00:00
|
|
|
{
|
|
|
|
struct device_node *np = chip->of_node;
|
|
|
|
struct of_phandle_args pinspec;
|
2012-11-06 15:03:35 +00:00
|
|
|
struct pinctrl_dev *pctldev;
|
2012-10-27 09:51:36 +00:00
|
|
|
int index = 0, ret;
|
2013-10-15 13:37:54 +00:00
|
|
|
const char *name;
|
|
|
|
static const char group_names_propname[] = "gpio-ranges-group-names";
|
|
|
|
struct property *group_names;
|
2012-10-27 09:51:36 +00:00
|
|
|
|
|
|
|
if (!np)
|
2015-07-14 08:29:54 +00:00
|
|
|
return 0;
|
2012-10-27 09:51:36 +00:00
|
|
|
|
2013-10-15 13:37:54 +00:00
|
|
|
group_names = of_find_property(np, group_names_propname, NULL);
|
|
|
|
|
2013-02-17 11:42:48 +00:00
|
|
|
for (;; index++) {
|
2013-08-14 21:27:12 +00:00
|
|
|
ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
|
|
|
|
index, &pinspec);
|
2012-10-27 09:51:36 +00:00
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
|
2012-11-06 15:03:35 +00:00
|
|
|
pctldev = of_pinctrl_get(pinspec.np);
|
2016-05-23 01:52:09 +00:00
|
|
|
of_node_put(pinspec.np);
|
2012-11-06 15:03:35 +00:00
|
|
|
if (!pctldev)
|
2015-07-14 08:29:54 +00:00
|
|
|
return -EPROBE_DEFER;
|
2012-10-27 09:51:36 +00:00
|
|
|
|
2013-10-15 13:37:54 +00:00
|
|
|
if (pinspec.args[2]) {
|
|
|
|
if (group_names) {
|
2015-07-07 20:22:15 +00:00
|
|
|
of_property_read_string_index(np,
|
2013-10-15 13:37:54 +00:00
|
|
|
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)
|
2015-07-14 08:29:54 +00:00
|
|
|
return ret;
|
2013-10-15 13:37:54 +00:00
|
|
|
} 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)
|
2015-07-14 08:29:54 +00:00
|
|
|
return ret;
|
2013-10-15 13:37:54 +00:00
|
|
|
}
|
2013-02-17 11:42:48 +00:00
|
|
|
}
|
2015-07-14 08:29:54 +00:00
|
|
|
|
|
|
|
return 0;
|
2012-10-27 09:51:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#else
|
2015-07-14 08:29:54 +00:00
|
|
|
static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
|
2012-10-27 09:51:36 +00:00
|
|
|
#endif
|
|
|
|
|
2015-07-14 08:29:54 +00:00
|
|
|
int of_gpiochip_add(struct gpio_chip *chip)
|
2010-06-08 13:48:17 +00:00
|
|
|
{
|
2015-07-14 08:29:54 +00:00
|
|
|
int status;
|
|
|
|
|
2015-11-04 08:56:26 +00:00
|
|
|
if ((!chip->of_node) && (chip->parent))
|
|
|
|
chip->of_node = chip->parent->of_node;
|
2010-06-08 13:48:17 +00:00
|
|
|
|
|
|
|
if (!chip->of_node)
|
2015-07-14 08:29:54 +00:00
|
|
|
return 0;
|
2010-06-08 13:48:17 +00:00
|
|
|
|
|
|
|
if (!chip->of_xlate) {
|
|
|
|
chip->of_gpio_n_cells = 2;
|
|
|
|
chip->of_xlate = of_gpio_simple_xlate;
|
|
|
|
}
|
|
|
|
|
2016-06-14 10:07:05 +00:00
|
|
|
if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2015-07-14 08:29:54 +00:00
|
|
|
status = of_gpiochip_add_pin_range(chip);
|
|
|
|
if (status)
|
|
|
|
return status;
|
|
|
|
|
2016-04-19 13:26:26 +00:00
|
|
|
/* If the chip defines names itself, these take precedence */
|
|
|
|
if (!chip->names)
|
|
|
|
of_gpiochip_set_names(chip);
|
|
|
|
|
2010-06-08 13:48:17 +00:00
|
|
|
of_node_get(chip->of_node);
|
2015-02-02 17:44:44 +00:00
|
|
|
|
2016-03-11 13:43:22 +00:00
|
|
|
return of_gpiochip_scan_gpios(chip);
|
2010-06-08 13:48:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void of_gpiochip_remove(struct gpio_chip *chip)
|
|
|
|
{
|
2012-11-06 14:03:47 +00:00
|
|
|
gpiochip_remove_pin_ranges(chip);
|
2014-08-08 10:07:51 +00:00
|
|
|
of_node_put(chip->of_node);
|
2010-06-08 13:48:17 +00:00
|
|
|
}
|