471 lines
12 KiB
C
471 lines
12 KiB
C
/* Support for the HID Boot Protocol. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008, 2009 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/term.h>
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#include <grub/time.h>
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#include <grub/misc.h>
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#include <grub/term.h>
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#include <grub/usb.h>
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#include <grub/dl.h>
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#include <grub/time.h>
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#include <grub/keyboard_layouts.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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enum
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{
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KEY_NO_KEY = 0x00,
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KEY_ERR_BUFFER = 0x01,
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KEY_ERR_POST = 0x02,
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KEY_ERR_UNDEF = 0x03,
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KEY_CAPS_LOCK = 0x39,
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KEY_NUM_LOCK = 0x53,
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};
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enum
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{
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LED_NUM_LOCK = 0x01,
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LED_CAPS_LOCK = 0x02
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};
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/* Valid values for bRequest. See HID definition version 1.11 section 7.2. */
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#define USB_HID_GET_REPORT 0x01
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#define USB_HID_GET_IDLE 0x02
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#define USB_HID_GET_PROTOCOL 0x03
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#define USB_HID_SET_REPORT 0x09
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#define USB_HID_SET_IDLE 0x0A
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#define USB_HID_SET_PROTOCOL 0x0B
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#define USB_HID_BOOT_SUBCLASS 0x01
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#define USB_HID_KBD_PROTOCOL 0x01
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#define GRUB_USB_KEYBOARD_LEFT_CTRL 0x01
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#define GRUB_USB_KEYBOARD_LEFT_SHIFT 0x02
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#define GRUB_USB_KEYBOARD_LEFT_ALT 0x04
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#define GRUB_USB_KEYBOARD_RIGHT_CTRL 0x10
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#define GRUB_USB_KEYBOARD_RIGHT_SHIFT 0x20
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#define GRUB_USB_KEYBOARD_RIGHT_ALT 0x40
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struct grub_usb_keyboard_data
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{
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grub_usb_device_t usbdev;
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grub_uint8_t status;
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grub_uint16_t mods;
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int interfno;
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struct grub_usb_desc_endp *endp;
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grub_usb_transfer_t transfer;
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grub_uint8_t report[8];
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int dead;
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int last_key;
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grub_uint64_t repeat_time;
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grub_uint8_t current_report[8];
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grub_uint8_t last_report[8];
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int index;
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int max_index;
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};
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static int grub_usb_keyboard_getkey (struct grub_term_input *term);
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static int grub_usb_keyboard_getkeystatus (struct grub_term_input *term);
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static struct grub_term_input grub_usb_keyboard_term =
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{
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.getkey = grub_usb_keyboard_getkey,
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.getkeystatus = grub_usb_keyboard_getkeystatus,
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.next = 0
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};
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static struct grub_term_input grub_usb_keyboards[16];
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static int
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interpret_status (grub_uint8_t data0)
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{
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int mods = 0;
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/* Check Shift, Control, and Alt status. */
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if (data0 & GRUB_USB_KEYBOARD_LEFT_SHIFT)
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mods |= GRUB_TERM_STATUS_LSHIFT;
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if (data0 & GRUB_USB_KEYBOARD_RIGHT_SHIFT)
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mods |= GRUB_TERM_STATUS_RSHIFT;
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if (data0 & GRUB_USB_KEYBOARD_LEFT_CTRL)
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mods |= GRUB_TERM_STATUS_LCTRL;
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if (data0 & GRUB_USB_KEYBOARD_RIGHT_CTRL)
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mods |= GRUB_TERM_STATUS_RCTRL;
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if (data0 & GRUB_USB_KEYBOARD_LEFT_ALT)
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mods |= GRUB_TERM_STATUS_LALT;
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if (data0 & GRUB_USB_KEYBOARD_RIGHT_ALT)
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mods |= GRUB_TERM_STATUS_RALT;
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return mods;
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}
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static void
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grub_usb_keyboard_detach (grub_usb_device_t usbdev,
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int config __attribute__ ((unused)),
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int interface __attribute__ ((unused)))
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{
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unsigned i;
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for (i = 0; i < ARRAY_SIZE (grub_usb_keyboards); i++)
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{
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struct grub_usb_keyboard_data *data = grub_usb_keyboards[i].data;
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if (!data)
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continue;
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if (data->usbdev != usbdev)
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continue;
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if (data->transfer)
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grub_usb_cancel_transfer (data->transfer);
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grub_term_unregister_input (&grub_usb_keyboards[i]);
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grub_free ((char *) grub_usb_keyboards[i].name);
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grub_usb_keyboards[i].name = NULL;
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grub_free (grub_usb_keyboards[i].data);
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grub_usb_keyboards[i].data = 0;
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}
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}
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static int
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grub_usb_keyboard_attach (grub_usb_device_t usbdev, int configno, int interfno)
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{
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unsigned curnum;
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struct grub_usb_keyboard_data *data;
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struct grub_usb_desc_endp *endp = NULL;
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int j;
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grub_dprintf ("usb_keyboard", "%x %x %x %d %d\n",
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usbdev->descdev.class, usbdev->descdev.subclass,
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usbdev->descdev.protocol, configno, interfno);
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for (curnum = 0; curnum < ARRAY_SIZE (grub_usb_keyboards); curnum++)
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if (!grub_usb_keyboards[curnum].data)
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break;
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if (curnum == ARRAY_SIZE (grub_usb_keyboards))
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return 0;
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if (usbdev->descdev.class != 0
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|| usbdev->descdev.subclass != 0 || usbdev->descdev.protocol != 0)
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return 0;
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if (usbdev->config[configno].interf[interfno].descif->subclass
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!= USB_HID_BOOT_SUBCLASS
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|| usbdev->config[configno].interf[interfno].descif->protocol
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!= USB_HID_KBD_PROTOCOL)
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return 0;
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for (j = 0; j < usbdev->config[configno].interf[interfno].descif->endpointcnt;
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j++)
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{
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endp = &usbdev->config[configno].interf[interfno].descendp[j];
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if ((endp->endp_addr & 128) && grub_usb_get_ep_type(endp)
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== GRUB_USB_EP_INTERRUPT)
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break;
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}
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if (j == usbdev->config[configno].interf[interfno].descif->endpointcnt)
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return 0;
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grub_dprintf ("usb_keyboard", "HID found!\n");
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data = grub_malloc (sizeof (*data));
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if (!data)
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{
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grub_print_error ();
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return 0;
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}
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data->usbdev = usbdev;
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data->interfno = interfno;
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data->endp = endp;
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/* Configure device */
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grub_usb_set_configuration (usbdev, configno + 1);
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/* Place the device in boot mode. */
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grub_usb_control_msg (usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
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USB_HID_SET_PROTOCOL, 0, interfno, 0, 0);
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/* Reports every time an event occurs and not more often than that. */
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grub_usb_control_msg (usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
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USB_HID_SET_IDLE, 0<<8, interfno, 0, 0);
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grub_memcpy (&grub_usb_keyboards[curnum], &grub_usb_keyboard_term,
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sizeof (grub_usb_keyboards[curnum]));
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grub_usb_keyboards[curnum].data = data;
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usbdev->config[configno].interf[interfno].detach_hook
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= grub_usb_keyboard_detach;
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grub_usb_keyboards[curnum].name = grub_xasprintf ("usb_keyboard%d", curnum);
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if (!grub_usb_keyboards[curnum].name)
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{
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grub_print_error ();
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return 0;
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}
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/* Test showed that getting report may make the keyboard go nuts.
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Moreover since we're reattaching keyboard it usually sends
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an initial message on interrupt pipe and so we retrieve
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the same keystatus.
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*/
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#if 0
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{
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grub_uint8_t report[8];
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grub_usb_err_t err;
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grub_memset (report, 0, sizeof (report));
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err = grub_usb_control_msg (usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_IN,
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USB_HID_GET_REPORT, 0x0100, interfno,
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sizeof (report), (char *) report);
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if (err)
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data->status = 0;
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else
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data->status = report[0];
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}
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#else
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data->status = 0;
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#endif
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data->transfer = grub_usb_bulk_read_background (usbdev,
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data->endp,
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sizeof (data->report),
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(char *) data->report);
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if (!data->transfer)
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{
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grub_print_error ();
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return 0;
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}
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data->last_key = -1;
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data->mods = 0;
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data->dead = 0;
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grub_term_register_input_active ("usb_keyboard", &grub_usb_keyboards[curnum]);
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return 1;
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}
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static void
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send_leds (struct grub_usb_keyboard_data *termdata)
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{
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char report[1];
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report[0] = 0;
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if (termdata->mods & GRUB_TERM_STATUS_CAPS)
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report[0] |= LED_CAPS_LOCK;
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if (termdata->mods & GRUB_TERM_STATUS_NUM)
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report[0] |= LED_NUM_LOCK;
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grub_usb_control_msg (termdata->usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
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USB_HID_SET_REPORT, 0x0200, termdata->interfno,
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sizeof (report), (char *) report);
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grub_errno = GRUB_ERR_NONE;
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}
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static int
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parse_keycode (struct grub_usb_keyboard_data *termdata)
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{
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int index = termdata->index;
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int i, keycode;
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/* Sanity check */
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if (index < 2)
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index = 2;
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for ( ; index < termdata->max_index; index++)
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{
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keycode = termdata->current_report[index];
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if (keycode == KEY_NO_KEY
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|| keycode == KEY_ERR_BUFFER
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|| keycode == KEY_ERR_POST
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|| keycode == KEY_ERR_UNDEF)
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{
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/* Don't parse (rest of) this report */
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termdata->index = 0;
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if (keycode != KEY_NO_KEY)
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/* Don't replace last report with current faulty report
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* in future ! */
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grub_memcpy (termdata->current_report,
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termdata->last_report,
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sizeof (termdata->report));
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return GRUB_TERM_NO_KEY;
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}
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/* Try to find current keycode in last report. */
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for (i = 2; i < 8; i++)
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if (keycode == termdata->last_report[i])
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break;
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if (i < 8)
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/* Keycode is in last report, it means it was not released,
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* ignore it. */
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continue;
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if (keycode == KEY_CAPS_LOCK)
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{
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termdata->mods ^= GRUB_TERM_STATUS_CAPS;
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send_leds (termdata);
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continue;
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}
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if (keycode == KEY_NUM_LOCK)
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{
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termdata->mods ^= GRUB_TERM_STATUS_NUM;
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send_leds (termdata);
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continue;
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}
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termdata->last_key = grub_term_map_key (keycode,
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interpret_status (termdata->current_report[0])
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| termdata->mods);
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termdata->repeat_time = grub_get_time_ms () + GRUB_TERM_REPEAT_PRE_INTERVAL;
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grub_errno = GRUB_ERR_NONE;
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index++;
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if (index >= termdata->max_index)
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termdata->index = 0;
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else
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termdata->index = index;
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return termdata->last_key;
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}
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/* All keycodes parsed */
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termdata->index = 0;
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return GRUB_TERM_NO_KEY;
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}
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static int
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grub_usb_keyboard_getkey (struct grub_term_input *term)
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{
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grub_usb_err_t err;
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struct grub_usb_keyboard_data *termdata = term->data;
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grub_size_t actual;
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int keycode = GRUB_TERM_NO_KEY;
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if (termdata->dead)
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return GRUB_TERM_NO_KEY;
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if (termdata->index)
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keycode = parse_keycode (termdata);
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if (keycode != GRUB_TERM_NO_KEY)
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return keycode;
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/* Poll interrupt pipe. */
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err = grub_usb_check_transfer (termdata->transfer, &actual);
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if (err == GRUB_USB_ERR_WAIT)
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{
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if (termdata->last_key != -1
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&& grub_get_time_ms () > termdata->repeat_time)
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{
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termdata->repeat_time = grub_get_time_ms ()
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+ GRUB_TERM_REPEAT_INTERVAL;
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return termdata->last_key;
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}
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return GRUB_TERM_NO_KEY;
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}
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if (!err && (actual >= 3))
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grub_memcpy (termdata->last_report,
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termdata->current_report,
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sizeof (termdata->report));
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grub_memcpy (termdata->current_report,
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termdata->report,
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sizeof (termdata->report));
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termdata->transfer = grub_usb_bulk_read_background (termdata->usbdev,
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termdata->endp,
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sizeof (termdata->report),
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(char *) termdata->report);
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if (!termdata->transfer)
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{
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grub_printf ("%s failed. Stopped\n", term->name);
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termdata->dead = 1;
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}
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termdata->last_key = -1;
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grub_dprintf ("usb_keyboard",
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"err = %d, actual = %" PRIuGRUB_SIZE
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" report: 0x%02x 0x%02x 0x%02x 0x%02x"
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" 0x%02x 0x%02x 0x%02x 0x%02x\n",
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err, actual,
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termdata->current_report[0], termdata->current_report[1],
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termdata->current_report[2], termdata->current_report[3],
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termdata->current_report[4], termdata->current_report[5],
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termdata->current_report[6], termdata->current_report[7]);
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if (err || actual < 1)
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return GRUB_TERM_NO_KEY;
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termdata->status = termdata->current_report[0];
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if (actual < 3)
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return GRUB_TERM_NO_KEY;
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termdata->index = 2; /* New data received. */
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termdata->max_index = actual;
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return parse_keycode (termdata);
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}
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static int
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grub_usb_keyboard_getkeystatus (struct grub_term_input *term)
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{
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struct grub_usb_keyboard_data *termdata = term->data;
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return interpret_status (termdata->status) | termdata->mods;
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}
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static struct grub_usb_attach_desc attach_hook =
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{
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.class = GRUB_USB_CLASS_HID,
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.hook = grub_usb_keyboard_attach
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};
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GRUB_MOD_INIT(usb_keyboard)
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{
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grub_usb_register_attach_hook_class (&attach_hook);
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}
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GRUB_MOD_FINI(usb_keyboard)
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{
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unsigned i;
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for (i = 0; i < ARRAY_SIZE (grub_usb_keyboards); i++)
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if (grub_usb_keyboards[i].data)
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{
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struct grub_usb_keyboard_data *data = grub_usb_keyboards[i].data;
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if (!data)
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continue;
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if (data->transfer)
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grub_usb_cancel_transfer (data->transfer);
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grub_term_unregister_input (&grub_usb_keyboards[i]);
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grub_free ((char *) grub_usb_keyboards[i].name);
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grub_usb_keyboards[i].name = NULL;
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grub_free (grub_usb_keyboards[i].data);
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grub_usb_keyboards[i].data = 0;
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}
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grub_usb_unregister_attach_hook_class (&attach_hook);
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}
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