diff options
| -rw-r--r-- | target/linux/generic/patches-4.4/084-0003-usb-core-read-USB-ports-from-DT-in-the-usbport-LED-t.patch | 106 |
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, |