lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 15 Apr 2014 14:41:35 +0800 From: Chen-Yu Tsai <wens@...e.org> To: Linus Walleij <linus.walleij@...aro.org>, Johannes Berg <johannes@...solutions.net>, "John W. Linville" <linville@...driver.com>, Maxime Ripard <maxime.ripard@...e-electrons.com> Cc: Chen-Yu Tsai <wens@...e.org>, Arnd Bergmann <arnd@...db.de>, Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Mika Westerberg <mika.westerberg@...ux.intel.com>, Alexandre Courbot <gnurou@...il.com>, Stephen Warren <swarren@...dotorg.org>, linux-gpio@...r.kernel.org, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com Subject: [PATCH 1/7] gpiolib: gpiolib-of: Implement device tree gpio-names based lookup This patch provides of_get_gpiod_flags_by_name(), which looks up GPIO phandles by name only, through gpios/gpio-names, and not by index. Signed-off-by: Chen-Yu Tsai <wens@...e.org> --- drivers/gpio/gpiolib-of.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_gpio.h | 3 +++ 2 files changed, 51 insertions(+) diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 2024d45..5c586fa 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -97,6 +97,54 @@ struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, EXPORT_SYMBOL(of_get_named_gpiod_flags); /** + * of_get_gpiod_flags_by_name() - Get a GPIO descriptor and flags by name + * @np: device node to get GPIO from + * @name: matching name of gpio phandle + * @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_gpiod_flags_by_name(struct device_node *np, + const char *name, 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 index = 0; + int ret; + + /* exit if no name given */ + if (!name) + return ERR_PTR(-EINVAL); + + /* .of_xlate might decide to not fill in the flags, so clear it. */ + if (flags) + *flags = 0; + + if (name) + index = of_property_match_string(np, "gpio-names", name); + + ret = of_parse_phandle_with_args(np, "gpios", "#gpio-cells", index, + &gg_data.gpiospec); + + if (ret) + return ERR_PTR(ret); + + gpiochip_find(&gg_data, of_gpiochip_find_and_xlate); + + of_node_put(gg_data.gpiospec.np); + + return gg_data.out_gpio; +} +EXPORT_SYMBOL(of_get_gpiod_flags_by_names); + +/** * 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 diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h index f14123a..134331f 100644 --- a/include/linux/of_gpio.h +++ b/include/linux/of_gpio.h @@ -51,6 +51,9 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) extern struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, const char *list_name, int index, enum of_gpio_flags *flags); +extern struct gpio_desc *of_get_gpiod_flags_by_name(struct device_node *np, + const char *name, enum of_gpio_flags *flags); + extern int of_mm_gpiochip_add(struct device_node *np, struct of_mm_gpio_chip *mm_gc); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists