drivers/hid/usbhid/usbkbd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1999-2001 Vojtech Pavlik
   4  *
   5  *  USB HIDBP Keyboard support
   6  */
   7
   8 /*
   9  *
  10  * Should you need to contact me, the author, you can do so either by
  11  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  12  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/usb/input.h>
  22 #include <linux/hid.h>
  23
  24 /*
  25  * Version Information
  26  */
  27 #define DRIVER_VERSION ""
  28 #define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
  29 #define DRIVER_DESC "USB HID Boot Protocol keyboard driver"
  30
  31 MODULE_AUTHOR(DRIVER_AUTHOR);
  32 MODULE_DESCRIPTION(DRIVER_DESC);
  33 MODULE_LICENSE("GPL");
  34
  35 static const unsigned char usb_kbd_keycode[256] = {
  36           0,  0,  0,  0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
  37          50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44,  2,  3,
  38           4,  5,  6,  7,  8,  9, 10, 11, 28,  1, 14, 15, 57, 12, 13, 26,
  39          27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
  40          65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
  41         105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
  42          72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
  43         191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
  44         115,114,  0,  0,  0,121,  0, 89, 93,124, 92, 94, 95,  0,  0,  0,
  45         122,123, 90, 91, 85,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  46           0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  47           0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  48           0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  49           0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  50          29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
  51         150,158,159,128,136,177,178,176,142,152,173,140
  52 };
  53
  54
  55 /**
  56  * struct usb_kbd - state of each attached keyboard
  57  * @dev:        input device associated with this keyboard
  58  * @usbdev:     usb device associated with this keyboard
  59  * @old:        data received in the past from the @irq URB representing which
  60  *              keys were pressed. By comparing with the current list of keys
  61  *              that are pressed, we are able to see key releases.
  62  * @irq:        URB for receiving a list of keys that are pressed when a
  63  *              new key is pressed or a key that was pressed is released.
  64  * @led:        URB for sending LEDs (e.g. numlock, ...)
  65  * @newleds:    data that will be sent with the @led URB representing which LEDs
  66                 should be on
  67  * @name:       Name of the keyboard. @dev's name field points to this buffer
  68  * @phys:       Physical path of the keyboard. @dev's phys field points to this
  69  *              buffer
  70  * @new:        Buffer for the @irq URB
  71  * @cr:         Control request for @led URB
  72  * @leds:       Buffer for the @led URB
  73  * @new_dma:    DMA address for @irq URB
  74  * @leds_dma:   DMA address for @led URB
  75  * @leds_lock:  spinlock that protects @leds, @newleds, and @led_urb_submitted
  76  * @led_urb_submitted: indicates whether @led is in progress, i.e. it has been
  77  *              submitted and its completion handler has not returned yet
  78  *              without resubmitting @led
  79  */
  80 struct usb_kbd {
  81         struct input_dev *dev;
  82         struct usb_device *usbdev;
  83         unsigned char old[8];
  84         struct urb *irq, *led;
  85         unsigned char newleds;
  86         char name[128];
  87         char phys[64];
  88
  89         unsigned char *new;
  90         struct usb_ctrlrequest *cr;
  91         unsigned char *leds;
  92         dma_addr_t new_dma;
  93         dma_addr_t leds_dma;
  94
  95         spinlock_t leds_lock;
  96         bool led_urb_submitted;
  97
  98 };
  99
 100 static void usb_kbd_irq(struct urb *urb)
 101 {
 102         struct usb_kbd *kbd = urb->context;
 103         int i;
 104
 105         switch (urb->status) {
 106         case 0:                 /* success */
 107                 break;
 108         case -ECONNRESET:       /* unlink */
 109         case -ENOENT:
 110         case -ESHUTDOWN:
 111                 return;
 112         /* -EPIPE:  should clear the halt */
 113         default:                /* error */
 114                 goto resubmit;
 115         }
 116
 117         for (i = 0; i < 8; i++)
 118                 input_report_key(kbd->dev, usb_kbd_keycode[i + 224], (kbd->new[0] >> i) & 1);
 119
 120         for (i = 2; i < 8; i++) {
 121
 122                 if (kbd->old[i] > 3 && memscan(kbd->new + 2, kbd->old[i], 6) == kbd->new + 8) {
 123                         if (usb_kbd_keycode[kbd->old[i]])
 124                                 input_report_key(kbd->dev, usb_kbd_keycode[kbd->old[i]], 0);
 125                         else
 126                                 hid_info(urb->dev,
 127                                          "Unknown key (scancode %#x) released.\n",
 128                                          kbd->old[i]);
 129                 }
 130
 131                 if (kbd->new[i] > 3 && memscan(kbd->old + 2, kbd->new[i], 6) == kbd->old + 8) {
 132                         if (usb_kbd_keycode[kbd->new[i]])
 133                                 input_report_key(kbd->dev, usb_kbd_keycode[kbd->new[i]], 1);
 134                         else
 135                                 hid_info(urb->dev,
 136                                          "Unknown key (scancode %#x) pressed.\n",
 137                                          kbd->new[i]);
 138                 }
 139         }
 140
 141         input_sync(kbd->dev);
 142
 143         memcpy(kbd->old, kbd->new, 8);
 144
 145 resubmit:
 146         i = usb_submit_urb (urb, GFP_ATOMIC);
 147         if (i)
 148                 hid_err(urb->dev, "can't resubmit intr, %s-%s/input0, status %d",
 149                         kbd->usbdev->bus->bus_name,
 150                         kbd->usbdev->devpath, i);
 151 }
 152
 153 static int usb_kbd_event(struct input_dev *dev, unsigned int type,
 154                          unsigned int code, int value)
 155 {
 156         unsigned long flags;
 157         struct usb_kbd *kbd = input_get_drvdata(dev);
 158
 159         if (type != EV_LED)
 160                 return -1;
 161
 162         spin_lock_irqsave(&kbd->leds_lock, flags);
 163         kbd->newleds = (!!test_bit(LED_KANA,    dev->led) << 3) | (!!test_bit(LED_COMPOSE, dev->led) << 3) |
 164                        (!!test_bit(LED_SCROLLL, dev->led) << 2) | (!!test_bit(LED_CAPSL,   dev->led) << 1) |
 165                        (!!test_bit(LED_NUML,    dev->led));
 166
 167         if (kbd->led_urb_submitted){
 168                 spin_unlock_irqrestore(&kbd->leds_lock, flags);
 169                 return 0;
 170         }
 171
 172         if (*(kbd->leds) == kbd->newleds){
 173                 spin_unlock_irqrestore(&kbd->leds_lock, flags);
 174                 return 0;
 175         }
 176
 177         *(kbd->leds) = kbd->newleds;
 178
 179         kbd->led->dev = kbd->usbdev;
 180         if (usb_submit_urb(kbd->led, GFP_ATOMIC))
 181                 pr_err("usb_submit_urb(leds) failed\n");
 182         else
 183                 kbd->led_urb_submitted = true;
 184
 185         spin_unlock_irqrestore(&kbd->leds_lock, flags);
 186
 187         return 0;
 188 }
 189
 190 static void usb_kbd_led(struct urb *urb)
 191 {
 192         unsigned long flags;
 193         struct usb_kbd *kbd = urb->context;
 194
 195         if (urb->status)
 196                 hid_warn(urb->dev, "led urb status %d received\n",
 197                          urb->status);
 198
 199         spin_lock_irqsave(&kbd->leds_lock, flags);
 200
 201         if (*(kbd->leds) == kbd->newleds){
 202                 kbd->led_urb_submitted = false;
 203                 spin_unlock_irqrestore(&kbd->leds_lock, flags);
 204                 return;
 205         }
 206
 207         *(kbd->leds) = kbd->newleds;
 208
 209         kbd->led->dev = kbd->usbdev;
 210         if (usb_submit_urb(kbd->led, GFP_ATOMIC)){
 211                 hid_err(urb->dev, "usb_submit_urb(leds) failed\n");
 212                 kbd->led_urb_submitted = false;
 213         }
 214         spin_unlock_irqrestore(&kbd->leds_lock, flags);
 215
 216 }
 217
 218 static int usb_kbd_open(struct input_dev *dev)
 219 {
 220         struct usb_kbd *kbd = input_get_drvdata(dev);
 221
 222         kbd->irq->dev = kbd->usbdev;
 223         if (usb_submit_urb(kbd->irq, GFP_KERNEL))
 224                 return -EIO;
 225
 226         return 0;
 227 }
 228
 229 static void usb_kbd_close(struct input_dev *dev)
 230 {
 231         struct usb_kbd *kbd = input_get_drvdata(dev);
 232
 233         usb_kill_urb(kbd->irq);
 234 }
 235
 236 static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
 237 {
 238         if (!(kbd->irq = usb_alloc_urb(0, GFP_KERNEL)))
 239                 return -1;
 240         if (!(kbd->led = usb_alloc_urb(0, GFP_KERNEL)))
 241                 return -1;
 242         if (!(kbd->new = usb_alloc_coherent(dev, 8, GFP_ATOMIC, &kbd->new_dma)))
 243                 return -1;
 244         if (!(kbd->cr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 245                 return -1;
 246         if (!(kbd->leds = usb_alloc_coherent(dev, 1, GFP_ATOMIC, &kbd->leds_dma)))
 247                 return -1;
 248
 249         return 0;
 250 }
 251
 252 static void usb_kbd_free_mem(struct usb_device *dev, struct usb_kbd *kbd)
 253 {
 254         usb_free_urb(kbd->irq);
 255         usb_free_urb(kbd->led);
 256         usb_free_coherent(dev, 8, kbd->new, kbd->new_dma);
 257         kfree(kbd->cr);
 258         usb_free_coherent(dev, 1, kbd->leds, kbd->leds_dma);
 259 }
 260
 261 static int usb_kbd_probe(struct usb_interface *iface,
 262                          const struct usb_device_id *id)
 263 {
 264         struct usb_device *dev = interface_to_usbdev(iface);
 265         struct usb_host_interface *interface;
 266         struct usb_endpoint_descriptor *endpoint;
 267         struct usb_kbd *kbd;
 268         struct input_dev *input_dev;
 269         int i, pipe, maxp;
 270         int error = -ENOMEM;
 271
 272         interface = iface->cur_altsetting;
 273
 274         if (interface->desc.bNumEndpoints != 1)
 275                 return -ENODEV;
 276
 277         endpoint = &interface->endpoint[0].desc;
 278         if (!usb_endpoint_is_int_in(endpoint))
 279                 return -ENODEV;
 280
 281         pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
 282         maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 283
 284         kbd = kzalloc(sizeof(struct usb_kbd), GFP_KERNEL);
 285         input_dev = input_allocate_device();
 286         if (!kbd || !input_dev)
 287                 goto fail1;
 288
 289         if (usb_kbd_alloc_mem(dev, kbd))
 290                 goto fail2;
 291
 292         kbd->usbdev = dev;
 293         kbd->dev = input_dev;
 294         spin_lock_init(&kbd->leds_lock);
 295
 296         if (dev->manufacturer)
 297                 strlcpy(kbd->name, dev->manufacturer, sizeof(kbd->name));
 298
 299         if (dev->product) {
 300                 if (dev->manufacturer)
 301                         strlcat(kbd->name, " ", sizeof(kbd->name));
 302                 strlcat(kbd->name, dev->product, sizeof(kbd->name));
 303         }
 304
 305         if (!strlen(kbd->name))
 306                 snprintf(kbd->name, sizeof(kbd->name),
 307                          "USB HIDBP Keyboard %04x:%04x",
 308                          le16_to_cpu(dev->descriptor.idVendor),
 309                          le16_to_cpu(dev->descriptor.idProduct));
 310
 311         usb_make_path(dev, kbd->phys, sizeof(kbd->phys));
 312         strlcat(kbd->phys, "/input0", sizeof(kbd->phys));
 313
 314         input_dev->name = kbd->name;
 315         input_dev->phys = kbd->phys;
 316         usb_to_input_id(dev, &input_dev->id);
 317         input_dev->dev.parent = &iface->dev;
 318
 319         input_set_drvdata(input_dev, kbd);
 320
 321         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
 322                 BIT_MASK(EV_REP);
 323         input_dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
 324                 BIT_MASK(LED_SCROLLL) | BIT_MASK(LED_COMPOSE) |
 325                 BIT_MASK(LED_KANA);
 326
 327         for (i = 0; i < 255; i++)
 328                 set_bit(usb_kbd_keycode[i], input_dev->keybit);
 329         clear_bit(0, input_dev->keybit);
 330
 331         input_dev->event = usb_kbd_event;
 332         input_dev->open = usb_kbd_open;
 333         input_dev->close = usb_kbd_close;
 334
 335         usb_fill_int_urb(kbd->irq, dev, pipe,
 336                          kbd->new, (maxp > 8 ? 8 : maxp),
 337                          usb_kbd_irq, kbd, endpoint->bInterval);
 338         kbd->irq->transfer_dma = kbd->new_dma;
 339         kbd->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 340
 341         kbd->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
 342         kbd->cr->bRequest = 0x09;
 343         kbd->cr->wValue = cpu_to_le16(0x200);
 344         kbd->cr->wIndex = cpu_to_le16(interface->desc.bInterfaceNumber);
 345         kbd->cr->wLength = cpu_to_le16(1);
 346
 347         usb_fill_control_urb(kbd->led, dev, usb_sndctrlpipe(dev, 0),
 348                              (void *) kbd->cr, kbd->leds, 1,
 349                              usb_kbd_led, kbd);
 350         kbd->led->transfer_dma = kbd->leds_dma;
 351         kbd->led->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 352
 353         error = input_register_device(kbd->dev);
 354         if (error)
 355                 goto fail2;
 356
 357         usb_set_intfdata(iface, kbd);
 358         device_set_wakeup_enable(&dev->dev, 1);
 359         return 0;
 360
 361 fail2:
 362         usb_kbd_free_mem(dev, kbd);
 363 fail1:
 364         input_free_device(input_dev);
 365         kfree(kbd);
 366         return error;
 367 }
 368
 369 static void usb_kbd_disconnect(struct usb_interface *intf)
 370 {
 371         struct usb_kbd *kbd = usb_get_intfdata (intf);
 372
 373         usb_set_intfdata(intf, NULL);
 374         if (kbd) {
 375                 usb_kill_urb(kbd->irq);
 376                 input_unregister_device(kbd->dev);
 377                 usb_kill_urb(kbd->led);
 378                 usb_kbd_free_mem(interface_to_usbdev(intf), kbd);
 379                 kfree(kbd);
 380         }
 381 }
 382
 383 static const struct usb_device_id usb_kbd_id_table[] = {
 384         { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
 385                 USB_INTERFACE_PROTOCOL_KEYBOARD) },
 386         { }                                             /* Terminating entry */
 387 };
 388
 389 MODULE_DEVICE_TABLE (usb, usb_kbd_id_table);
 390
 391 static struct usb_driver usb_kbd_driver = {
 392         .name =         "usbkbd",
 393         .probe =        usb_kbd_probe,
 394         .disconnect =   usb_kbd_disconnect,
 395         .id_table =     usb_kbd_id_table,
 396 };
 397
 398 module_usb_driver(usb_kbd_driver);