328 lines
8 KiB
C
328 lines
8 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/cpu/io.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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static char keyboard_map[128] =
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{
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'\0', '\0', '\0', '\0', 'a', 'b', 'c', 'd',
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'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
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'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
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'u', 'v', 'w', 'x', 'y', 'z', '1', '2',
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'3', '4', '5', '6', '7', '8', '9', '0',
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'\n', GRUB_TERM_ESC, GRUB_TERM_BACKSPACE, GRUB_TERM_TAB, ' ', '-', '=', '[',
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']', '\\', '#', ';', '\'', '`', ',', '.',
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'/', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
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'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
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'\0', '\0', GRUB_TERM_HOME, GRUB_TERM_PPAGE, GRUB_TERM_DC, GRUB_TERM_END, GRUB_TERM_NPAGE, GRUB_TERM_RIGHT,
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GRUB_TERM_LEFT, GRUB_TERM_DOWN, GRUB_TERM_UP
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};
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static char keyboard_map_shift[128] =
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{
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'\0', '\0', '\0', '\0', 'A', 'B', 'C', 'D',
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'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
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'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
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'U', 'V', 'W', 'X', 'Y', 'Z', '!', '@',
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'#', '$', '%', '^', '&', '*', '(', ')',
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'\n', '\0', '\0', '\0', ' ', '_', '+', '{',
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'}', '|', '#', ':', '"', '`', '<', '>',
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'?'
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};
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static grub_usb_device_t usbdev;
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/* Valid values for bmRequestType. See HID definition version 1.11 section
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7.2. */
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#define USB_HID_HOST_TO_DEVICE 0x21
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#define USB_HID_DEVICE_TO_HOST 0xA1
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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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static void
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grub_usb_hid (void)
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{
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struct grub_usb_desc_device *descdev;
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auto int usb_iterate (grub_usb_device_t dev);
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int usb_iterate (grub_usb_device_t dev)
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{
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descdev = &dev->descdev;
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grub_dprintf ("usb_keyboard", "%x %x %x\n",
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descdev->class, descdev->subclass, descdev->protocol);
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#if 0
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if (descdev->class != 0x09
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|| descdev->subclass == 0x01
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|| descdev->protocol != 0x02)
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return 0;
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#endif
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if (descdev->class != 0 || descdev->subclass != 0 || descdev->protocol != 0)
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return 0;
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grub_printf ("HID found!\n");
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usbdev = dev;
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return 1;
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}
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grub_usb_iterate (usb_iterate);
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/* Place the device in boot mode. */
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grub_usb_control_msg (usbdev, USB_HID_HOST_TO_DEVICE, USB_HID_SET_PROTOCOL,
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0, 0, 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, USB_HID_HOST_TO_DEVICE, USB_HID_SET_IDLE,
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0<<8, 0, 0, 0);
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}
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static grub_err_t
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grub_usb_keyboard_getreport (grub_usb_device_t dev, grub_uint8_t *report)
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{
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return grub_usb_control_msg (dev, USB_HID_DEVICE_TO_HOST, USB_HID_GET_REPORT,
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0, 0, 8, (char *) report);
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}
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static int
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grub_usb_keyboard_checkkey (void)
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{
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grub_uint8_t data[8];
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int key;
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grub_err_t err;
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grub_uint64_t currtime;
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int timeout = 50;
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data[2] = 0;
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currtime = grub_get_time_ms ();
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do
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{
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/* Get_Report. */
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err = grub_usb_keyboard_getreport (usbdev, data);
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/* Implement a timeout. */
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if (grub_get_time_ms () > currtime + timeout)
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break;
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}
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while (err || !data[2]);
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if (err || !data[2])
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return -1;
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grub_dprintf ("usb_keyboard",
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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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data[0], data[1], data[2], data[3],
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data[4], data[5], data[6], data[7]);
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/* Check if the Control or Shift key was pressed. */
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if (data[0] & 0x01 || data[0] & 0x10)
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key = keyboard_map[data[2]] - 'a' + 1;
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else if (data[0] & 0x02 || data[0] & 0x20)
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key = keyboard_map_shift[data[2]];
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else
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key = keyboard_map[data[2]];
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if (key == 0)
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grub_printf ("Unknown key 0x%x detected\n", data[2]);
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#if 0
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/* Wait until the key is released. */
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while (!err && data[2])
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{
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err = grub_usb_control_msg (usbdev, USB_HID_DEVICE_TO_HOST,
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USB_HID_GET_REPORT, 0, 0,
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sizeof (data), (char *) data);
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grub_dprintf ("usb_keyboard",
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"report2: 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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data[0], data[1], data[2], data[3],
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data[4], data[5], data[6], data[7]);
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}
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#endif
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grub_errno = GRUB_ERR_NONE;
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return key;
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}
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typedef enum
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{
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GRUB_HIDBOOT_REPEAT_NONE,
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GRUB_HIDBOOT_REPEAT_FIRST,
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GRUB_HIDBOOT_REPEAT
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} grub_usb_keyboard_repeat_t;
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static int
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grub_usb_keyboard_getkey (void)
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{
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int key;
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grub_err_t err;
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grub_uint8_t data[8];
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grub_uint64_t currtime;
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int timeout;
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static grub_usb_keyboard_repeat_t repeat = GRUB_HIDBOOT_REPEAT_NONE;
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again:
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do
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{
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key = grub_usb_keyboard_checkkey ();
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} while (key == -1);
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data[2] = !0; /* Or whatever. */
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err = 0;
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switch (repeat)
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{
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case GRUB_HIDBOOT_REPEAT_FIRST:
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timeout = 500;
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break;
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case GRUB_HIDBOOT_REPEAT:
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timeout = 50;
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break;
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default:
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timeout = 100;
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break;
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}
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/* Wait until the key is released. */
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currtime = grub_get_time_ms ();
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while (!err && data[2])
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{
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/* Implement a timeout. */
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if (grub_get_time_ms () > currtime + timeout)
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{
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if (repeat == 0)
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repeat = 1;
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else
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repeat = 2;
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grub_errno = GRUB_ERR_NONE;
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return key;
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}
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err = grub_usb_keyboard_getreport (usbdev, data);
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}
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if (repeat)
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{
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repeat = 0;
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goto again;
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}
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repeat = 0;
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grub_errno = GRUB_ERR_NONE;
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return key;
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}
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static int
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grub_usb_keyboard_getkeystatus (void)
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{
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grub_uint8_t data[8];
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int mods = 0;
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grub_err_t err;
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grub_uint64_t currtime;
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int timeout = 50;
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/* Set idle time to the minimum offered by the spec (4 milliseconds) so
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that we can find out the current state. */
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grub_usb_control_msg (usbdev, USB_HID_HOST_TO_DEVICE, USB_HID_SET_IDLE,
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0<<8, 0, 0, 0);
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currtime = grub_get_time_ms ();
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do
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{
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/* Get_Report. */
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err = grub_usb_keyboard_getreport (usbdev, data);
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/* Implement a timeout. */
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if (grub_get_time_ms () > currtime + timeout)
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break;
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}
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while (err || !data[0]);
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/* Go back to reporting every time an event occurs and not more often than
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that. */
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grub_usb_control_msg (usbdev, USB_HID_HOST_TO_DEVICE, USB_HID_SET_IDLE,
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0<<8, 0, 0, 0);
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/* We allowed a while for modifiers to show up in the report, but it is
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not an error if they never did. */
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if (err)
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return -1;
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grub_dprintf ("usb_keyboard",
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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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data[0], data[1], data[2], data[3],
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data[4], data[5], data[6], data[7]);
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/* Check Shift, Control, and Alt status. */
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if (data[0] & 0x02 || data[0] & 0x20)
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mods |= GRUB_TERM_STATUS_SHIFT;
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if (data[0] & 0x01 || data[0] & 0x10)
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mods |= GRUB_TERM_STATUS_CTRL;
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if (data[0] & 0x04 || data[0] & 0x40)
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mods |= GRUB_TERM_STATUS_ALT;
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grub_errno = GRUB_ERR_NONE;
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return mods;
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}
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static struct grub_term_input grub_usb_keyboard_term =
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{
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.name = "usb_keyboard",
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.checkkey = grub_usb_keyboard_checkkey,
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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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GRUB_MOD_INIT(usb_keyboard)
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{
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grub_usb_hid ();
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grub_term_register_input ("usb_keyboard", &grub_usb_keyboard_term);
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}
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GRUB_MOD_FINI(usb_keyboard)
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{
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grub_term_unregister_input (&grub_usb_keyboard_term);
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}
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