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Use dentry_path() to create full path to inode object
[pohmelfs.git] / drivers / hid / usbhid / usbkbd.c
blob796086980f4a622dfe2857eec1d00ff33cdff787
1 /*
2 * Copyright (c) 1999-2001 Vojtech Pavlik
3 *
4 * USB HIDBP Keyboard support
5 */
6
7 /*
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * Should you need to contact me, the author, you can do so either by
23 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
24 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
25 */
26
27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/usb/input.h>
34 #include <linux/hid.h>
35
36 /*
37 * Version Information
38 */
39 #define DRIVER_VERSION ""
40 #define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
41 #define DRIVER_DESC "USB HID Boot Protocol keyboard driver"
42 #define DRIVER_LICENSE "GPL"
43
44 MODULE_AUTHOR(DRIVER_AUTHOR);
45 MODULE_DESCRIPTION(DRIVER_DESC);
46 MODULE_LICENSE(DRIVER_LICENSE);
47
48 static const unsigned char usb_kbd_keycode[256] = {
49 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
50 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44, 2, 3,
51 4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 14, 15, 57, 12, 13, 26,
52 27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
53 65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
54 105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
55 72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
56 191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
57 115,114, 0, 0, 0,121, 0, 89, 93,124, 92, 94, 95, 0, 0, 0,
58 122,123, 90, 91, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
60 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
62 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
63 29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
64 150,158,159,128,136,177,178,176,142,152,173,140
65 };
66
67
68 /**
69 * struct usb_kbd - state of each attached keyboard
70 * @dev: input device associated with this keyboard
71 * @usbdev: usb device associated with this keyboard
72 * @old: data received in the past from the @irq URB representing which
73 * keys were pressed. By comparing with the current list of keys
74 * that are pressed, we are able to see key releases.
75 * @irq: URB for receiving a list of keys that are pressed when a
76 * new key is pressed or a key that was pressed is released.
77 * @led: URB for sending LEDs (e.g. numlock, ...)
78 * @newleds: data that will be sent with the @led URB representing which LEDs
79 should be on
80 * @name: Name of the keyboard. @dev's name field points to this buffer
81 * @phys: Physical path of the keyboard. @dev's phys field points to this
82 * buffer
83 * @new: Buffer for the @irq URB
84 * @cr: Control request for @led URB
85 * @leds: Buffer for the @led URB
86 * @new_dma: DMA address for @irq URB
87 * @leds_dma: DMA address for @led URB
88 * @leds_lock: spinlock that protects @leds, @newleds, and @led_urb_submitted
89 * @led_urb_submitted: indicates whether @led is in progress, i.e. it has been
90 * submitted and its completion handler has not returned yet
91 * without resubmitting @led
92 */
93 struct usb_kbd {
94 struct input_dev *dev;
95 struct usb_device *usbdev;
96 unsigned char old[8];
97 struct urb *irq, *led;
98 unsigned char newleds;
99 char name[128];
100 char phys[64];
101
102 unsigned char *new;
103 struct usb_ctrlrequest *cr;
104 unsigned char *leds;
105 dma_addr_t new_dma;
106 dma_addr_t leds_dma;
107
108 spinlock_t leds_lock;
109 bool led_urb_submitted;
110
111 };
112
113 static void usb_kbd_irq(struct urb *urb)
114 {
115 struct usb_kbd *kbd = urb->context;
116 int i;
117
118 switch (urb->status) {
119 case 0: /* success */
120 break;
121 case -ECONNRESET: /* unlink */
122 case -ENOENT:
123 case -ESHUTDOWN:
124 return;
125 /* -EPIPE: should clear the halt */
126 default: /* error */
127 goto resubmit;
128 }
129
130 for (i = 0; i < 8; i++)
131 input_report_key(kbd->dev, usb_kbd_keycode[i + 224], (kbd->new[0] >> i) & 1);
132
133 for (i = 2; i < 8; i++) {
134
135 if (kbd->old[i] > 3 && memscan(kbd->new + 2, kbd->old[i], 6) == kbd->new + 8) {
136 if (usb_kbd_keycode[kbd->old[i]])
137 input_report_key(kbd->dev, usb_kbd_keycode[kbd->old[i]], 0);
138 else
139 hid_info(urb->dev,
140 "Unknown key (scancode %#x) released.\n",
141 kbd->old[i]);
142 }
143
144 if (kbd->new[i] > 3 && memscan(kbd->old + 2, kbd->new[i], 6) == kbd->old + 8) {
145 if (usb_kbd_keycode[kbd->new[i]])
146 input_report_key(kbd->dev, usb_kbd_keycode[kbd->new[i]], 1);
147 else
148 hid_info(urb->dev,
149 "Unknown key (scancode %#x) released.\n",
150 kbd->new[i]);
151 }
152 }
153
154 input_sync(kbd->dev);
155
156 memcpy(kbd->old, kbd->new, 8);
157
158 resubmit:
159 i = usb_submit_urb (urb, GFP_ATOMIC);
160 if (i)
161 hid_err(urb->dev, "can't resubmit intr, %s-%s/input0, status %d",
162 kbd->usbdev->bus->bus_name,
163 kbd->usbdev->devpath, i);
164 }
165
166 static int usb_kbd_event(struct input_dev *dev, unsigned int type,
167 unsigned int code, int value)
168 {
169 unsigned long flags;
170 struct usb_kbd *kbd = input_get_drvdata(dev);
171
172 if (type != EV_LED)
173 return -1;
174
175 spin_lock_irqsave(&kbd->leds_lock, flags);
176 kbd->newleds = (!!test_bit(LED_KANA, dev->led) << 3) | (!!test_bit(LED_COMPOSE, dev->led) << 3) |
177 (!!test_bit(LED_SCROLLL, dev->led) << 2) | (!!test_bit(LED_CAPSL, dev->led) << 1) |
178 (!!test_bit(LED_NUML, dev->led));
179
180 if (kbd->led_urb_submitted){
181 spin_unlock_irqrestore(&kbd->leds_lock, flags);
182 return 0;
183 }
184
185 if (*(kbd->leds) == kbd->newleds){
186 spin_unlock_irqrestore(&kbd->leds_lock, flags);
187 return 0;
188 }
189
190 *(kbd->leds) = kbd->newleds;
191
192 kbd->led->dev = kbd->usbdev;
193 if (usb_submit_urb(kbd->led, GFP_ATOMIC))
194 pr_err("usb_submit_urb(leds) failed\n");
195 else
196 kbd->led_urb_submitted = true;
197
198 spin_unlock_irqrestore(&kbd->leds_lock, flags);
199
200 return 0;
201 }
202
203 static void usb_kbd_led(struct urb *urb)
204 {
205 unsigned long flags;
206 struct usb_kbd *kbd = urb->context;
207
208 if (urb->status)
209 hid_warn(urb->dev, "led urb status %d received\n",
210 urb->status);
211
212 spin_lock_irqsave(&kbd->leds_lock, flags);
213
214 if (*(kbd->leds) == kbd->newleds){
215 kbd->led_urb_submitted = false;
216 spin_unlock_irqrestore(&kbd->leds_lock, flags);
217 return;
218 }
219
220 *(kbd->leds) = kbd->newleds;
221
222 kbd->led->dev = kbd->usbdev;
223 if (usb_submit_urb(kbd->led, GFP_ATOMIC)){
224 hid_err(urb->dev, "usb_submit_urb(leds) failed\n");
225 kbd->led_urb_submitted = false;
226 }
227 spin_unlock_irqrestore(&kbd->leds_lock, flags);
228
229 }
230
231 static int usb_kbd_open(struct input_dev *dev)
232 {
233 struct usb_kbd *kbd = input_get_drvdata(dev);
234
235 kbd->irq->dev = kbd->usbdev;
236 if (usb_submit_urb(kbd->irq, GFP_KERNEL))
237 return -EIO;
238
239 return 0;
240 }
241
242 static void usb_kbd_close(struct input_dev *dev)
243 {
244 struct usb_kbd *kbd = input_get_drvdata(dev);
245
246 usb_kill_urb(kbd->irq);
247 }
248
249 static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
250 {
251 if (!(kbd->irq = usb_alloc_urb(0, GFP_KERNEL)))
252 return -1;
253 if (!(kbd->led = usb_alloc_urb(0, GFP_KERNEL)))
254 return -1;
255 if (!(kbd->new = usb_alloc_coherent(dev, 8, GFP_ATOMIC, &kbd->new_dma)))
256 return -1;
257 if (!(kbd->cr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
258 return -1;
259 if (!(kbd->leds = usb_alloc_coherent(dev, 1, GFP_ATOMIC, &kbd->leds_dma)))
260 return -1;
261
262 return 0;
263 }
264
265 static void usb_kbd_free_mem(struct usb_device *dev, struct usb_kbd *kbd)
266 {
267 usb_free_urb(kbd->irq);
268 usb_free_urb(kbd->led);
269 usb_free_coherent(dev, 8, kbd->new, kbd->new_dma);
270 kfree(kbd->cr);
271 usb_free_coherent(dev, 1, kbd->leds, kbd->leds_dma);
272 }
273
274 static int usb_kbd_probe(struct usb_interface *iface,
275 const struct usb_device_id *id)
276 {
277 struct usb_device *dev = interface_to_usbdev(iface);
278 struct usb_host_interface *interface;
279 struct usb_endpoint_descriptor *endpoint;
280 struct usb_kbd *kbd;
281 struct input_dev *input_dev;
282 int i, pipe, maxp;
283 int error = -ENOMEM;
284
285 interface = iface->cur_altsetting;
286
287 if (interface->desc.bNumEndpoints != 1)
288 return -ENODEV;
289
290 endpoint = &interface->endpoint[0].desc;
291 if (!usb_endpoint_is_int_in(endpoint))
292 return -ENODEV;
293
294 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
295 maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
296
297 kbd = kzalloc(sizeof(struct usb_kbd), GFP_KERNEL);
298 input_dev = input_allocate_device();
299 if (!kbd || !input_dev)
300 goto fail1;
301
302 if (usb_kbd_alloc_mem(dev, kbd))
303 goto fail2;
304
305 kbd->usbdev = dev;
306 kbd->dev = input_dev;
307 spin_lock_init(&kbd->leds_lock);
308
309 if (dev->manufacturer)
310 strlcpy(kbd->name, dev->manufacturer, sizeof(kbd->name));
311
312 if (dev->product) {
313 if (dev->manufacturer)
314 strlcat(kbd->name, " ", sizeof(kbd->name));
315 strlcat(kbd->name, dev->product, sizeof(kbd->name));
316 }
317
318 if (!strlen(kbd->name))
319 snprintf(kbd->name, sizeof(kbd->name),
320 "USB HIDBP Keyboard %04x:%04x",
321 le16_to_cpu(dev->descriptor.idVendor),
322 le16_to_cpu(dev->descriptor.idProduct));
323
324 usb_make_path(dev, kbd->phys, sizeof(kbd->phys));
325 strlcat(kbd->phys, "/input0", sizeof(kbd->phys));
326
327 input_dev->name = kbd->name;
328 input_dev->phys = kbd->phys;
329 usb_to_input_id(dev, &input_dev->id);
330 input_dev->dev.parent = &iface->dev;
331
332 input_set_drvdata(input_dev, kbd);
333
334 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
335 BIT_MASK(EV_REP);
336 input_dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
337 BIT_MASK(LED_SCROLLL) | BIT_MASK(LED_COMPOSE) |
338 BIT_MASK(LED_KANA);
339
340 for (i = 0; i < 255; i++)
341 set_bit(usb_kbd_keycode[i], input_dev->keybit);
342 clear_bit(0, input_dev->keybit);
343
344 input_dev->event = usb_kbd_event;
345 input_dev->open = usb_kbd_open;
346 input_dev->close = usb_kbd_close;
347
348 usb_fill_int_urb(kbd->irq, dev, pipe,
349 kbd->new, (maxp > 8 ? 8 : maxp),
350 usb_kbd_irq, kbd, endpoint->bInterval);
351 kbd->irq->transfer_dma = kbd->new_dma;
352 kbd->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
353
354 kbd->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
355 kbd->cr->bRequest = 0x09;
356 kbd->cr->wValue = cpu_to_le16(0x200);
357 kbd->cr->wIndex = cpu_to_le16(interface->desc.bInterfaceNumber);
358 kbd->cr->wLength = cpu_to_le16(1);
359
360 usb_fill_control_urb(kbd->led, dev, usb_sndctrlpipe(dev, 0),
361 (void *) kbd->cr, kbd->leds, 1,
362 usb_kbd_led, kbd);
363 kbd->led->transfer_dma = kbd->leds_dma;
364 kbd->led->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
365
366 error = input_register_device(kbd->dev);
367 if (error)
368 goto fail2;
369
370 usb_set_intfdata(iface, kbd);
371 device_set_wakeup_enable(&dev->dev, 1);
372 return 0;
373
374 fail2:
375 usb_kbd_free_mem(dev, kbd);
376 fail1:
377 input_free_device(input_dev);
378 kfree(kbd);
379 return error;
380 }
381
382 static void usb_kbd_disconnect(struct usb_interface *intf)
383 {
384 struct usb_kbd *kbd = usb_get_intfdata (intf);
385
386 usb_set_intfdata(intf, NULL);
387 if (kbd) {
388 usb_kill_urb(kbd->irq);
389 input_unregister_device(kbd->dev);
390 usb_kill_urb(kbd->led);
391 usb_kbd_free_mem(interface_to_usbdev(intf), kbd);
392 kfree(kbd);
393 }
394 }
395
396 static struct usb_device_id usb_kbd_id_table [] = {
397 { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
398 USB_INTERFACE_PROTOCOL_KEYBOARD) },
399 { } /* Terminating entry */
400 };
401
402 MODULE_DEVICE_TABLE (usb, usb_kbd_id_table);
403
404 static struct usb_driver usb_kbd_driver = {
405 .name = "usbkbd",
406 .probe = usb_kbd_probe,
407 .disconnect = usb_kbd_disconnect,
408 .id_table = usb_kbd_id_table,
409 };
410
411 module_usb_driver(usb_kbd_driver);