From 4f04c210d031667e503d6538a72345a36f3b5d71 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= 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 Signed-off-by: Greg Kroah-Hartman --- 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 #include #include +#include #include #include +#include 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,