OpenWrt – Rev 4
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From 183148e0789bee1cd5c46ba49afcb211f636f8a2 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@freemail.hu>
Date: Mon, 15 Jan 2018 15:01:14 +0100
Subject: [PATCH] leds: gpio: allow to use OPEN_{DRAIN,SOURCE} flags with
legacy GPIOs
LEDs which are connected to open-source or open-drain type of GPIO lines
can be used only, if those are defined via devicetree.
Add two new fields to 'struct gpio_led' in order to make it possible to
specify this type of GPIO lines to the leds-gpio driver via platform data.
Also update the create_gpio_led() function to set the GPIOF_OPEN_DRAIN and
GPIOF_OPEN_SOURCE flags for the given GPIO line.
Signed-off-by: Gabor Juhos <juhosg@freemail.hu>
---
drivers/leds/leds-gpio.c | 6 ++++++
include/linux/leds.h | 2 ++
2 files changed, 8 insertions(+)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -100,6 +100,12 @@ static int create_gpio_led(const struct
if (template->active_low)
flags |= GPIOF_ACTIVE_LOW;
+ if (template->open_drain)
+ flags |= GPIOF_OPEN_DRAIN;
+
+ if (template->open_source)
+ flags |= GPIOF_OPEN_SOURCE;
+
ret = devm_gpio_request_one(parent, template->gpio, flags,
template->name);
if (ret < 0)
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -395,6 +395,8 @@ struct gpio_led {
unsigned default_state : 2;
unsigned retain_state_shutdown : 1;
/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
+ unsigned open_drain : 1;
+ unsigned open_source : 1;
struct gpio_desc *gpiod;
};
#define LEDS_GPIO_DEFSTATE_OFF 0