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usbkbd.c

/*
 * $Id: usbkbd.c,v 1.27 2001/12/27 10:37:41 vojtech Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  USB HIDBP Keyboard support
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <linux/hid.h>

/*
 * Version Information
 */
#define DRIVER_VERSION ""
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB HID Boot Protocol keyboard driver"
#define DRIVER_LICENSE "GPL"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);

static unsigned char usb_kbd_keycode[256] = {
        0,  0,  0,  0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
       50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44,  2,  3,
        4,  5,  6,  7,  8,  9, 10, 11, 28,  1, 14, 15, 57, 12, 13, 26,
       27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
       65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
      105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
       72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
      191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
      115,114,  0,  0,  0,121,  0, 89, 93,124, 92, 94, 95,  0,  0,  0,
      122,123, 90, 91, 85,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
        0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
        0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
        0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
        0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
       29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
      150,158,159,128,136,177,178,176,142,152,173,140
};

struct usb_kbd {
      struct input_dev *dev;
      struct usb_device *usbdev;
      unsigned char old[8];
      struct urb *irq, *led;
      unsigned char newleds;
      char name[128];
      char phys[64];

      unsigned char *new;
      struct usb_ctrlrequest *cr;
      unsigned char *leds;
      dma_addr_t cr_dma;
      dma_addr_t new_dma;
      dma_addr_t leds_dma;
};

static void usb_kbd_irq(struct urb *urb)
{
      struct usb_kbd *kbd = urb->context;
      int i;

      switch (urb->status) {
      case 0:                 /* success */
            break;
      case -ECONNRESET: /* unlink */
      case -ENOENT:
      case -ESHUTDOWN:
            return;
      /* -EPIPE:  should clear the halt */
      default:          /* error */
            goto resubmit;
      }

      for (i = 0; i < 8; i++)
            input_report_key(kbd->dev, usb_kbd_keycode[i + 224], (kbd->new[0] >> i) & 1);

      for (i = 2; i < 8; i++) {

            if (kbd->old[i] > 3 && memscan(kbd->new + 2, kbd->old[i], 6) == kbd->new + 8) {
                  if (usb_kbd_keycode[kbd->old[i]])
                        input_report_key(kbd->dev, usb_kbd_keycode[kbd->old[i]], 0);
                  else
                        info("Unknown key (scancode %#x) released.", kbd->old[i]);
            }

            if (kbd->new[i] > 3 && memscan(kbd->old + 2, kbd->new[i], 6) == kbd->old + 8) {
                  if (usb_kbd_keycode[kbd->new[i]])
                        input_report_key(kbd->dev, usb_kbd_keycode[kbd->new[i]], 1);
                  else
                        info("Unknown key (scancode %#x) pressed.", kbd->new[i]);
            }
      }

      input_sync(kbd->dev);

      memcpy(kbd->old, kbd->new, 8);

resubmit:
      i = usb_submit_urb (urb, GFP_ATOMIC);
      if (i)
            err_hid ("can't resubmit intr, %s-%s/input0, status %d",
                        kbd->usbdev->bus->bus_name,
                        kbd->usbdev->devpath, i);
}

static int usb_kbd_event(struct input_dev *dev, unsigned int type,
                   unsigned int code, int value)
{
      struct usb_kbd *kbd = input_get_drvdata(dev);

      if (type != EV_LED)
            return -1;

      kbd->newleds = (!!test_bit(LED_KANA,    dev->led) << 3) | (!!test_bit(LED_COMPOSE, dev->led) << 3) |
                   (!!test_bit(LED_SCROLLL, dev->led) << 2) | (!!test_bit(LED_CAPSL,   dev->led) << 1) |
                   (!!test_bit(LED_NUML,    dev->led));

      if (kbd->led->status == -EINPROGRESS)
            return 0;

      if (*(kbd->leds) == kbd->newleds)
            return 0;

      *(kbd->leds) = kbd->newleds;
      kbd->led->dev = kbd->usbdev;
      if (usb_submit_urb(kbd->led, GFP_ATOMIC))
            err_hid("usb_submit_urb(leds) failed");

      return 0;
}

static void usb_kbd_led(struct urb *urb)
{
      struct usb_kbd *kbd = urb->context;

      if (urb->status)
            warn("led urb status %d received", urb->status);

      if (*(kbd->leds) == kbd->newleds)
            return;

      *(kbd->leds) = kbd->newleds;
      kbd->led->dev = kbd->usbdev;
      if (usb_submit_urb(kbd->led, GFP_ATOMIC))
            err_hid("usb_submit_urb(leds) failed");
}

static int usb_kbd_open(struct input_dev *dev)
{
      struct usb_kbd *kbd = input_get_drvdata(dev);

      kbd->irq->dev = kbd->usbdev;
      if (usb_submit_urb(kbd->irq, GFP_KERNEL))
            return -EIO;

      return 0;
}

static void usb_kbd_close(struct input_dev *dev)
{
      struct usb_kbd *kbd = input_get_drvdata(dev);

      usb_kill_urb(kbd->irq);
}

static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
{
      if (!(kbd->irq = usb_alloc_urb(0, GFP_KERNEL)))
            return -1;
      if (!(kbd->led = usb_alloc_urb(0, GFP_KERNEL)))
            return -1;
      if (!(kbd->new = usb_buffer_alloc(dev, 8, GFP_ATOMIC, &kbd->new_dma)))
            return -1;
      if (!(kbd->cr = usb_buffer_alloc(dev, sizeof(struct usb_ctrlrequest), GFP_ATOMIC, &kbd->cr_dma)))
            return -1;
      if (!(kbd->leds = usb_buffer_alloc(dev, 1, GFP_ATOMIC, &kbd->leds_dma)))
            return -1;

      return 0;
}

static void usb_kbd_free_mem(struct usb_device *dev, struct usb_kbd *kbd)
{
      usb_free_urb(kbd->irq);
      usb_free_urb(kbd->led);
      usb_buffer_free(dev, 8, kbd->new, kbd->new_dma);
      usb_buffer_free(dev, sizeof(struct usb_ctrlrequest), kbd->cr, kbd->cr_dma);
      usb_buffer_free(dev, 1, kbd->leds, kbd->leds_dma);
}

static int usb_kbd_probe(struct usb_interface *iface,
                   const struct usb_device_id *id)
{
      struct usb_device *dev = interface_to_usbdev(iface);
      struct usb_host_interface *interface;
      struct usb_endpoint_descriptor *endpoint;
      struct usb_kbd *kbd;
      struct input_dev *input_dev;
      int i, pipe, maxp;
      int error = -ENOMEM;

      interface = iface->cur_altsetting;

      if (interface->desc.bNumEndpoints != 1)
            return -ENODEV;

      endpoint = &interface->endpoint[0].desc;
      if (!usb_endpoint_is_int_in(endpoint))
            return -ENODEV;

      pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
      maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));

      kbd = kzalloc(sizeof(struct usb_kbd), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!kbd || !input_dev)
            goto fail1;

      if (usb_kbd_alloc_mem(dev, kbd))
            goto fail2;

      kbd->usbdev = dev;
      kbd->dev = input_dev;

      if (dev->manufacturer)
            strlcpy(kbd->name, dev->manufacturer, sizeof(kbd->name));

      if (dev->product) {
            if (dev->manufacturer)
                  strlcat(kbd->name, " ", sizeof(kbd->name));
            strlcat(kbd->name, dev->product, sizeof(kbd->name));
      }

      if (!strlen(kbd->name))
            snprintf(kbd->name, sizeof(kbd->name),
                   "USB HIDBP Keyboard %04x:%04x",
                   le16_to_cpu(dev->descriptor.idVendor),
                   le16_to_cpu(dev->descriptor.idProduct));

      usb_make_path(dev, kbd->phys, sizeof(kbd->phys));
      strlcpy(kbd->phys, "/input0", sizeof(kbd->phys));

      input_dev->name = kbd->name;
      input_dev->phys = kbd->phys;
      usb_to_input_id(dev, &input_dev->id);
      input_dev->dev.parent = &iface->dev;

      input_set_drvdata(input_dev, kbd);

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
            BIT_MASK(EV_REP);
      input_dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
            BIT_MASK(LED_SCROLLL) | BIT_MASK(LED_COMPOSE) |
            BIT_MASK(LED_KANA);

      for (i = 0; i < 255; i++)
            set_bit(usb_kbd_keycode[i], input_dev->keybit);
      clear_bit(0, input_dev->keybit);

      input_dev->event = usb_kbd_event;
      input_dev->open = usb_kbd_open;
      input_dev->close = usb_kbd_close;

      usb_fill_int_urb(kbd->irq, dev, pipe,
                   kbd->new, (maxp > 8 ? 8 : maxp),
                   usb_kbd_irq, kbd, endpoint->bInterval);
      kbd->irq->transfer_dma = kbd->new_dma;
      kbd->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

      kbd->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
      kbd->cr->bRequest = 0x09;
      kbd->cr->wValue = cpu_to_le16(0x200);
      kbd->cr->wIndex = cpu_to_le16(interface->desc.bInterfaceNumber);
      kbd->cr->wLength = cpu_to_le16(1);

      usb_fill_control_urb(kbd->led, dev, usb_sndctrlpipe(dev, 0),
                       (void *) kbd->cr, kbd->leds, 1,
                       usb_kbd_led, kbd);
      kbd->led->setup_dma = kbd->cr_dma;
      kbd->led->transfer_dma = kbd->leds_dma;
      kbd->led->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP);

      error = input_register_device(kbd->dev);
      if (error)
            goto fail2;

      usb_set_intfdata(iface, kbd);
      return 0;

fail2:      
      usb_kbd_free_mem(dev, kbd);
fail1:      
      input_free_device(input_dev);
      kfree(kbd);
      return error;
}

static void usb_kbd_disconnect(struct usb_interface *intf)
{
      struct usb_kbd *kbd = usb_get_intfdata (intf);

      usb_set_intfdata(intf, NULL);
      if (kbd) {
            usb_kill_urb(kbd->irq);
            input_unregister_device(kbd->dev);
            usb_kbd_free_mem(interface_to_usbdev(intf), kbd);
            kfree(kbd);
      }
}

static struct usb_device_id usb_kbd_id_table [] = {
      { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
            USB_INTERFACE_PROTOCOL_KEYBOARD) },
      { }                                 /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_kbd_id_table);

static struct usb_driver usb_kbd_driver = {
      .name =           "usbkbd",
      .probe =    usb_kbd_probe,
      .disconnect =     usb_kbd_disconnect,
      .id_table = usb_kbd_id_table,
};

static int __init usb_kbd_init(void)
{
      int result = usb_register(&usb_kbd_driver);
      if (result == 0)
            info(DRIVER_VERSION ":" DRIVER_DESC);
      return result;
}

static void __exit usb_kbd_exit(void)
{
      usb_deregister(&usb_kbd_driver);
}

module_init(usb_kbd_init);
module_exit(usb_kbd_exit);

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