struct usb_hub *usb_hub_alloc(struct usb_hcd *hcd, usb_hub_port_t port_n) {
struct usb_hub *hub = pool_alloc(&usb_hubs);
hub->hcd = hcd;
hub->port_n = port_n;
for (int i = 0; i < port_n; i++) {
usb_hub_port_init(&hub->ports[i], hub, i);
}
return hub;
}
/**
* Load hub-specific information into hub_dev structure and process if needed
*
* Read port count and initialize structures holding per port information.
* If there are any non-removable devices, start initializing them.
* This function is hub-specific and should be run only after the hub is
* configured using usb_set_first_configuration function.
* @param hub_dev hub representation
* @return error code
*/
static int usb_hub_process_hub_specific_info(usb_hub_dev_t *hub_dev)
{
assert(hub_dev);
/* Get hub descriptor. */
usb_log_debug("Retrieving descriptor\n");
usb_pipe_t *control_pipe = &hub_dev->usb_device->ctrl_pipe;
usb_hub_descriptor_header_t descriptor;
size_t received_size;
int opResult = usb_request_get_descriptor(control_pipe,
USB_REQUEST_TYPE_CLASS, USB_REQUEST_RECIPIENT_DEVICE,
USB_DESCTYPE_HUB, 0, 0, &descriptor,
sizeof(usb_hub_descriptor_header_t), &received_size);
if (opResult != EOK) {
usb_log_error("Failed to receive hub descriptor: %s.\n",
str_error(opResult));
return opResult;
}
usb_log_debug("Setting port count to %d.\n", descriptor.port_count);
hub_dev->port_count = descriptor.port_count;
hub_dev->ports = calloc(hub_dev->port_count, sizeof(usb_hub_port_t));
if (!hub_dev->ports) {
return ENOMEM;
}
for (size_t port = 0; port < hub_dev->port_count; ++port) {
usb_hub_port_init(
&hub_dev->ports[port], port + 1, control_pipe);
}
hub_dev->power_switched =
!(descriptor.characteristics & HUB_CHAR_NO_POWER_SWITCH_FLAG);
hub_dev->per_port_power =
descriptor.characteristics & HUB_CHAR_POWER_PER_PORT_FLAG;
if (!hub_dev->power_switched) {
usb_log_info(
"Power switching not supported, ports always powered.\n");
return EOK;
}
usb_log_info("Hub port power switching enabled.\n");
for (size_t port = 0; port < hub_dev->port_count; ++port) {
usb_log_debug("Powering port %zu.\n", port);
const int ret = usb_hub_port_set_feature(
&hub_dev->ports[port], USB_HUB_FEATURE_PORT_POWER);
if (ret != EOK) {
usb_log_error("Cannot power on port %zu: %s.\n",
hub_dev->ports[port].port_number, str_error(ret));
} else {
if (!hub_dev->per_port_power) {
usb_log_debug("Ganged power switching, "
"one port is enough.\n");
break;
}
}
}
return EOK;
}