336 lines
8.6 KiB
C
336 lines
8.6 KiB
C
/* usb.c - Generic USB interfaces. */
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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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#include <grub/list.h>
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#include <grub/dl.h>
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static grub_usb_controller_dev_t grub_usb_list;
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struct grub_usb_attach_desc *attach_hooks;
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void
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grub_usb_controller_dev_register (grub_usb_controller_dev_t usb)
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{
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auto int iterate_hook (grub_usb_controller_t dev);
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/* Iterate over all controllers found by the driver. */
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int iterate_hook (grub_usb_controller_t dev)
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{
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dev->dev = usb;
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/* Enable the ports of the USB Root Hub. */
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grub_usb_root_hub (dev);
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return 0;
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}
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usb->next = grub_usb_list;
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grub_usb_list = usb;
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if (usb->iterate)
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usb->iterate (iterate_hook);
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}
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void
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grub_usb_controller_dev_unregister (grub_usb_controller_dev_t usb)
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{
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grub_usb_controller_dev_t *p, q;
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for (p = &grub_usb_list, q = *p; q; p = &(q->next), q = q->next)
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if (q == usb)
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{
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*p = q->next;
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break;
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}
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}
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#if 0
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int
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grub_usb_controller_iterate (int (*hook) (grub_usb_controller_t dev))
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{
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grub_usb_controller_dev_t p;
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auto int iterate_hook (grub_usb_controller_t dev);
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int iterate_hook (grub_usb_controller_t dev)
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{
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dev->dev = p;
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if (hook (dev))
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return 1;
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return 0;
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}
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/* Iterate over all controller drivers. */
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for (p = grub_usb_list; p; p = p->next)
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{
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/* Iterate over the busses of the controllers. XXX: Actually, a
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hub driver should do this. */
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if (p->iterate (iterate_hook))
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return 1;
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}
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return 0;
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}
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#endif
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grub_usb_err_t
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grub_usb_clear_halt (grub_usb_device_t dev, int endpoint)
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{
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dev->toggle[endpoint] = 0;
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return grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
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| GRUB_USB_REQTYPE_STANDARD
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| GRUB_USB_REQTYPE_TARGET_ENDP),
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GRUB_USB_REQ_CLEAR_FEATURE,
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GRUB_USB_FEATURE_ENDP_HALT,
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endpoint, 0, 0);
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}
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grub_usb_err_t
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grub_usb_set_configuration (grub_usb_device_t dev, int configuration)
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{
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grub_memset (dev->toggle, 0, sizeof (dev->toggle));
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return grub_usb_control_msg (dev, (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_CONFIGURATION, configuration,
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0, 0, NULL);
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}
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grub_usb_err_t
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grub_usb_get_descriptor (grub_usb_device_t dev,
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grub_uint8_t type, grub_uint8_t index,
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grub_size_t size, char *data)
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{
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return grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_IN
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| GRUB_USB_REQTYPE_STANDARD
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| GRUB_USB_REQTYPE_TARGET_DEV),
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GRUB_USB_REQ_GET_DESCRIPTOR,
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(type << 8) | index,
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0, size, data);
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}
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struct grub_usb_desc_endp *
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grub_usb_get_endpdescriptor (grub_usb_device_t usbdev, int addr)
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{
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int i;
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for (i = 0; i < usbdev->config[0].descconf->numif; i++)
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{
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struct grub_usb_desc_if *interf;
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int j;
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interf = usbdev->config[0].interf[i].descif;
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for (j = 0; j < interf->endpointcnt; j++)
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{
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struct grub_usb_desc_endp *endp;
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endp = &usbdev->config[0].interf[i].descendp[j];
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if (endp->endp_addr == addr)
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return endp;
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}
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}
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return NULL;
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}
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grub_usb_err_t
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grub_usb_device_initialize (grub_usb_device_t dev)
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{
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struct grub_usb_desc_device *descdev;
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struct grub_usb_desc_config config;
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grub_usb_err_t err;
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int i;
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/* First we have to read first 8 bytes only and determine
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* max. size of packet */
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dev->descdev.maxsize0 = 0; /* invalidating, for safety only, can be removed if it is sure it is zero here */
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err = grub_usb_get_descriptor (dev, GRUB_USB_DESCRIPTOR_DEVICE,
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0, 8, (char *) &dev->descdev);
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if (err)
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return err;
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/* Now we have valid value in dev->descdev.maxsize0,
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* so we can read whole device descriptor */
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err = grub_usb_get_descriptor (dev, GRUB_USB_DESCRIPTOR_DEVICE,
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0, sizeof (struct grub_usb_desc_device),
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(char *) &dev->descdev);
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if (err)
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return err;
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descdev = &dev->descdev;
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for (i = 0; i < 8; i++)
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dev->config[i].descconf = NULL;
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for (i = 0; i < descdev->configcnt; i++)
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{
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int pos;
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int currif;
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char *data;
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/* First just read the first 4 bytes of the configuration
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descriptor, after that it is known how many bytes really have
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to be read. */
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err = grub_usb_get_descriptor (dev, GRUB_USB_DESCRIPTOR_CONFIG, i, 4,
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(char *) &config);
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data = grub_malloc (config.totallen);
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if (! data)
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{
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err = GRUB_USB_ERR_INTERNAL;
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goto fail;
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}
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dev->config[i].descconf = (struct grub_usb_desc_config *) data;
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err = grub_usb_get_descriptor (dev, GRUB_USB_DESCRIPTOR_CONFIG, i,
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config.totallen, data);
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if (err)
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goto fail;
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/* Skip the configuration descriptor. */
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pos = dev->config[i].descconf->length;
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/* Read all interfaces. */
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for (currif = 0; currif < dev->config[i].descconf->numif; currif++)
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{
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while (pos < config.totallen
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&& ((struct grub_usb_desc *)&data[pos])->type
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!= GRUB_USB_DESCRIPTOR_INTERFACE)
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pos += ((struct grub_usb_desc *)&data[pos])->length;
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dev->config[i].interf[currif].descif
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= (struct grub_usb_desc_if *) &data[pos];
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pos += dev->config[i].interf[currif].descif->length;
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while (pos < config.totallen
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&& ((struct grub_usb_desc *)&data[pos])->type
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!= GRUB_USB_DESCRIPTOR_ENDPOINT)
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pos += ((struct grub_usb_desc *)&data[pos])->length;
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/* Point to the first endpoint. */
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dev->config[i].interf[currif].descendp
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= (struct grub_usb_desc_endp *) &data[pos];
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pos += (sizeof (struct grub_usb_desc_endp)
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* dev->config[i].interf[currif].descif->endpointcnt);
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}
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}
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return GRUB_USB_ERR_NONE;
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fail:
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for (i = 0; i < 8; i++)
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grub_free (dev->config[i].descconf);
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return err;
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}
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void grub_usb_device_attach (grub_usb_device_t dev)
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{
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int i;
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/* XXX: Just check configuration 0 for now. */
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for (i = 0; i < dev->config[0].descconf->numif; i++)
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{
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struct grub_usb_desc_if *interf;
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struct grub_usb_attach_desc *desc;
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interf = dev->config[0].interf[i].descif;
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grub_dprintf ("usb", "iterate: interf=%d, class=%d, subclass=%d, protocol=%d\n",
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i, interf->class, interf->subclass, interf->protocol);
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if (dev->config[0].interf[i].attached)
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continue;
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for (desc = attach_hooks; desc; desc = desc->next)
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if (interf->class == desc->class && desc->hook (dev, 0, i))
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dev->config[0].interf[i].attached = 1;
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if (dev->config[0].interf[i].attached)
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continue;
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switch (interf->class)
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{
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case GRUB_USB_CLASS_MASS_STORAGE:
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grub_dl_load ("usbms");
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break;
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case GRUB_USB_CLASS_HID:
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grub_dl_load ("usb_keyboard");
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break;
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case 0xff:
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/* FIXME: don't load useless modules. */
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grub_dl_load ("usbserial_ftdi");
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grub_dl_load ("usbserial_pl2303");
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break;
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}
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}
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}
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void
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grub_usb_register_attach_hook_class (struct grub_usb_attach_desc *desc)
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{
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auto int usb_iterate (grub_usb_device_t dev);
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int usb_iterate (grub_usb_device_t usbdev)
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{
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struct grub_usb_desc_device *descdev = &usbdev->descdev;
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int i;
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if (descdev->class != 0 || descdev->subclass || descdev->protocol != 0
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|| descdev->configcnt == 0)
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return 0;
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/* XXX: Just check configuration 0 for now. */
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for (i = 0; i < usbdev->config[0].descconf->numif; i++)
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{
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struct grub_usb_desc_if *interf;
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interf = usbdev->config[0].interf[i].descif;
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grub_dprintf ("usb", "iterate: interf=%d, class=%d, subclass=%d, protocol=%d\n",
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i, interf->class, interf->subclass, interf->protocol);
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if (usbdev->config[0].interf[i].attached)
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continue;
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if (interf->class != desc->class)
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continue;
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if (desc->hook (usbdev, 0, i))
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usbdev->config[0].interf[i].attached = 1;
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}
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return 0;
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}
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desc->next = attach_hooks;
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attach_hooks = desc;
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grub_usb_iterate (usb_iterate);
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}
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void
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grub_usb_unregister_attach_hook_class (struct grub_usb_attach_desc *desc)
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{
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grub_list_remove (GRUB_AS_LIST_P (&attach_hooks), GRUB_AS_LIST (desc));
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}
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