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_KERNEL, &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_KERNEL, &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); 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); 399