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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,
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