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net: phy: leds: add support for led triggers on phy link state change

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Create an option CONFIG_LED_TRIGGER_PHY (default n), which will create a
set of led triggers for each instantiated PHY device. There is one LED
trigger per link-speed, per-phy.
The triggers are registered during phy_attach and unregistered during
phy_detach.

This allows for a user to configure their system to allow a set of LEDs
not controlled by the phy to represent link state changes on the phy.
LEDS controlled by the phy are unaffected.

For example, we have a board where some of the leds in the
RJ45 socket are controlled by the phy, but others are not. Using the
triggers provided by this patch the leds not controlled by the phy can
be configured to show the current speed of the ethernet connection. The
leds controlled by the phy are unaffected.

Signed-off-by: Josh Cartwright <josh.cartwright@ni.com>
Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Signed-off-by: Zach Brown <zach.brown@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zach Brown
2016-10-17 10:49:55 -05:00
committed by David S. Miller
parent 1f9127caec
commit 2e0bc452f4
7 changed files with 214 additions and 0 deletions
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7
include/linux/phy.h
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@@ -25,6 +25,7 @@
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/mod_devicetable.h>
#include <linux/phy_led_triggers.h>
#include <linux/atomic.h>
@@ -420,6 +421,12 @@ struct phy_device {
int link_timeout;
#ifdef CONFIG_LED_TRIGGER_PHY
struct phy_led_trigger *phy_led_triggers;
unsigned int phy_num_led_triggers;
struct phy_led_trigger *last_triggered;
#endif
/*
* Interrupt number for this PHY
* -1 means no interrupt