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authorRafał Miłecki <rafal@milecki.pl>2017-06-28 11:31:14 +0200
committerRafał Miłecki <rafal@milecki.pl>2017-06-28 11:31:38 +0200
commit76c460b5849aca14a7b4a233f5d25f3720f9bc3a (patch)
treed61888c626259675637d4a9b1f5cfb1604509d02 /target/linux/generic/patches-4.4
parent6371159b4ae8b4dd94d6319ac805b0c26962bb14 (diff)
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kernel: backport usbport LED trigger driver support for DT
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Diffstat (limited to 'target/linux/generic/patches-4.4')
-rw-r--r--target/linux/generic/patches-4.4/084-0003-usb-core-read-USB-ports-from-DT-in-the-usbport-LED-t.patch106
1 files changed, 106 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/084-0003-usb-core-read-USB-ports-from-DT-in-the-usbport-LED-t.patch b/target/linux/generic/patches-4.4/084-0003-usb-core-read-USB-ports-from-DT-in-the-usbport-LED-t.patch
new file mode 100644
index 0000000000..65d17c8a9e
--- /dev/null
+++ b/target/linux/generic/patches-4.4/084-0003-usb-core-read-USB-ports-from-DT-in-the-usbport-LED-t.patch
@@ -0,0 +1,106 @@
+From 4f04c210d031667e503d6538a72345a36f3b5d71 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Thu, 8 Jun 2017 18:08:32 +0200
+Subject: [PATCH] usb: core: read USB ports from DT in the usbport LED trigger
+ driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This uses DT info to read relation description of LEDs and USB ports. If
+DT has properly described LEDs, trigger will know when to turn them on.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/usb/core/ledtrig-usbport.c | 56 ++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 56 insertions(+)
+
+--- a/drivers/usb/core/ledtrig-usbport.c
++++ b/drivers/usb/core/ledtrig-usbport.c
+@@ -11,8 +11,10 @@
+ #include <linux/device.h>
+ #include <linux/leds.h>
+ #include <linux/module.h>
++#include <linux/of.h>
+ #include <linux/slab.h>
+ #include <linux/usb.h>
++#include <linux/usb/of.h>
+
+ struct usbport_trig_data {
+ struct led_classdev *led_cdev;
+@@ -123,6 +125,57 @@ static const struct attribute_group port
+ * Adding & removing ports
+ ***************************************/
+
++/**
++ * usbport_trig_port_observed - Check if port should be observed
++ */
++static bool usbport_trig_port_observed(struct usbport_trig_data *usbport_data,
++ struct usb_device *usb_dev, int port1)
++{
++ struct device *dev = usbport_data->led_cdev->dev;
++ struct device_node *led_np = dev->of_node;
++ struct of_phandle_args args;
++ struct device_node *port_np;
++ int count, i;
++
++ if (!led_np)
++ return false;
++
++ /* Get node of port being added */
++ port_np = usb_of_get_child_node(usb_dev->dev.of_node, port1);
++ if (!port_np)
++ return false;
++
++ /* Amount of trigger sources for this LED */
++ count = of_count_phandle_with_args(led_np, "trigger-sources",
++ "#trigger-source-cells");
++ if (count < 0) {
++ dev_warn(dev, "Failed to get trigger sources for %s\n",
++ led_np->full_name);
++ return false;
++ }
++
++ /* Check list of sources for this specific port */
++ for (i = 0; i < count; i++) {
++ int err;
++
++ err = of_parse_phandle_with_args(led_np, "trigger-sources",
++ "#trigger-source-cells", i,
++ &args);
++ if (err) {
++ dev_err(dev, "Failed to get trigger source phandle at index %d: %d\n",
++ i, err);
++ continue;
++ }
++
++ of_node_put(args.np);
++
++ if (args.np == port_np)
++ return true;
++ }
++
++ return false;
++}
++
+ static int usbport_trig_add_port(struct usbport_trig_data *usbport_data,
+ struct usb_device *usb_dev,
+ const char *hub_name, int portnum)
+@@ -141,6 +194,8 @@ static int usbport_trig_add_port(struct
+ port->data = usbport_data;
+ port->hub = usb_dev;
+ port->portnum = portnum;
++ port->observed = usbport_trig_port_observed(usbport_data, usb_dev,
++ portnum);
+
+ len = strlen(hub_name) + 8;
+ port->port_name = kzalloc(len, GFP_KERNEL);
+@@ -255,6 +310,7 @@ static void usbport_trig_activate(struct
+ if (err)
+ goto err_free;
+ usb_for_each_dev(usbport_data, usbport_trig_add_usb_dev_ports);
++ usbport_trig_update_count(usbport_data);
+
+ /* Notifications */
+ usbport_data->nb.notifier_call = usbport_trig_notify,