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BVK Chaitanya
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810 changed files with 4980 additions and 2508 deletions
192
grub-core/bus/usb/usbhub.c
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192
grub-core/bus/usb/usbhub.c
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/* usb.c - USB Hub Support. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/usb.h>
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#include <grub/misc.h>
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/* USB Supports 127 devices, with device 0 as special case. */
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static struct grub_usb_device *grub_usb_devs[128];
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/* Add a device that currently has device number 0 and resides on
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CONTROLLER, the Hub reported that the device speed is SPEED. */
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static grub_usb_device_t
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grub_usb_hub_add_dev (grub_usb_controller_t controller, grub_usb_speed_t speed)
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{
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grub_usb_device_t dev;
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int i;
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dev = grub_zalloc (sizeof (struct grub_usb_device));
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if (! dev)
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return NULL;
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dev->controller = *controller;
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dev->speed = speed;
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grub_usb_device_initialize (dev);
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/* Assign a new address to the device. */
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for (i = 1; i < 128; i++)
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{
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if (! grub_usb_devs[i])
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break;
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}
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if (i == 128)
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{
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grub_error (GRUB_ERR_IO, "can't assign address to USB device");
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return NULL;
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}
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grub_usb_control_msg (dev,
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(GRUB_USB_REQTYPE_OUT
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| GRUB_USB_REQTYPE_STANDARD
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| GRUB_USB_REQTYPE_TARGET_DEV),
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GRUB_USB_REQ_SET_ADDRESS,
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i, 0, 0, NULL);
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dev->addr = i;
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dev->initialized = 1;
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grub_usb_devs[i] = dev;
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return dev;
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}
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static grub_err_t
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grub_usb_add_hub (grub_usb_device_t dev)
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{
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struct grub_usb_usb_hubdesc hubdesc;
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grub_err_t err;
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int i;
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grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_IN
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| GRUB_USB_REQTYPE_CLASS
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| GRUB_USB_REQTYPE_TARGET_DEV),
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GRUB_USB_REQ_GET_DESCRIPTOR,
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(GRUB_USB_DESCRIPTOR_HUB << 8) | 0,
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0, sizeof (hubdesc), (char *) &hubdesc);
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/* Iterate over the Hub ports. */
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for (i = 1; i <= hubdesc.portcnt; i++)
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{
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grub_uint32_t status;
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/* Get the port status. */
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err = grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_IN
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| GRUB_USB_REQTYPE_CLASS
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| GRUB_USB_REQTYPE_TARGET_OTHER),
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GRUB_USB_REQ_HUB_GET_PORT_STATUS,
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0, i, sizeof (status), (char *) &status);
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/* Just ignore the device if the Hub does not report the
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status. */
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if (err)
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continue;
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/* If connected, reset and enable the port. */
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if (status & GRUB_USB_HUB_STATUS_CONNECTED)
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{
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grub_usb_speed_t speed;
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/* Determine the device speed. */
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if (status & GRUB_USB_HUB_STATUS_LOWSPEED)
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speed = GRUB_USB_SPEED_LOW;
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else
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{
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if (status & GRUB_USB_HUB_STATUS_HIGHSPEED)
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speed = GRUB_USB_SPEED_HIGH;
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else
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speed = GRUB_USB_SPEED_FULL;
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}
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/* A device is actually connected to this port, not enable
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the port. XXX: Why 0x03? According to some docs it
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should be 0x0. Check the specification! */
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err = grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
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| GRUB_USB_REQTYPE_CLASS
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| GRUB_USB_REQTYPE_TARGET_OTHER),
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0x3, 0x4, i, 0, 0);
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/* If the Hub does not cooperate for this port, just skip
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the port. */
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if (err)
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continue;
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/* Add the device and assign a device address to it. */
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grub_usb_hub_add_dev (&dev->controller, speed);
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}
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}
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return GRUB_ERR_NONE;
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}
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grub_usb_err_t
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grub_usb_root_hub (grub_usb_controller_t controller)
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{
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grub_err_t err;
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int ports;
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int i;
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/* Query the number of ports the root Hub has. */
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ports = controller->dev->hubports (controller);
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for (i = 0; i < ports; i++)
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{
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grub_usb_speed_t speed = controller->dev->detect_dev (controller, i);
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if (speed != GRUB_USB_SPEED_NONE)
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{
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grub_usb_device_t dev;
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/* Enable the port. */
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err = controller->dev->portstatus (controller, i, 1);
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if (err)
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continue;
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/* Enable the port and create a device. */
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dev = grub_usb_hub_add_dev (controller, speed);
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if (! dev)
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continue;
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/* If the device is a Hub, scan it for more devices. */
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if (dev->descdev.class == 0x09)
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grub_usb_add_hub (dev);
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}
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}
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return GRUB_USB_ERR_NONE;
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}
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int
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grub_usb_iterate (int (*hook) (grub_usb_device_t dev))
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{
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int i;
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for (i = 0; i < 128; i++)
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{
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if (grub_usb_devs[i])
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{
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if (hook (grub_usb_devs[i]))
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return 1;
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}
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}
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return 0;
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}
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