3 * Denis Peter, MPL AG Switzerland
5 * Part of this source has been derived from the Linux USB
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <stdio_dev.h>
30 #include <asm/byteorder.h>
35 #define USB_KBD_PRINTF(fmt, args...) printf(fmt, ##args)
37 #define USB_KBD_PRINTF(fmt, args...)
41 * If overwrite_console returns 1, the stdin, stderr and stdout
42 * are switched to the serial port, else the settings in the
43 * environment are used
45 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
46 extern int overwrite_console(void);
48 int overwrite_console(void)
54 /* Keyboard sampling rate */
55 #define REPEAT_RATE (40 / 4) /* 40msec -> 25cps */
56 #define REPEAT_DELAY 10 /* 10 x REPEAT_RATE = 400msec */
59 #define CAPS_LOCK 0x39
60 #define SCROLL_LOCK 0x47
63 #define LEFT_CNTR (1 << 0)
64 #define LEFT_SHIFT (1 << 1)
65 #define LEFT_ALT (1 << 2)
66 #define LEFT_GUI (1 << 3)
67 #define RIGHT_CNTR (1 << 4)
68 #define RIGHT_SHIFT (1 << 5)
69 #define RIGHT_ALT (1 << 6)
70 #define RIGHT_GUI (1 << 7)
72 /* Size of the keyboard buffer */
73 #define USB_KBD_BUFFER_LEN 0x20
76 #define DEVNAME "usbkbd"
79 static const unsigned char usb_kbd_numkey[] = {
80 '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
81 '\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
82 '\\', '#', ';', '\'', '`', ',', '.', '/'
84 static const unsigned char usb_kbd_numkey_shifted[] = {
85 '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
86 '\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
87 '|', '~', ':', '"', '~', '<', '>', '?'
90 static const unsigned char usb_kbd_num_keypad[] = {
91 '/', '*', '-', '+', '\r',
92 '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
97 * map arrow keys to ^F/^B ^N/^P, can't really use the proper
98 * ANSI sequence for arrow keys because the queuing code breaks
99 * when a single keypress expands to 3 queue elements
101 static const unsigned char usb_kbd_arrow[] = {
106 * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
107 * order. See usb_kbd_setled() function!
109 #define USB_KBD_NUMLOCK (1 << 0)
110 #define USB_KBD_CAPSLOCK (1 << 1)
111 #define USB_KBD_SCROLLLOCK (1 << 2)
112 #define USB_KBD_CTRL (1 << 3)
114 #define USB_KBD_LEDMASK \
115 (USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
117 struct usb_kbd_pdata {
118 uint32_t repeat_delay;
120 uint32_t usb_in_pointer;
121 uint32_t usb_out_pointer;
122 uint8_t usb_kbd_buffer[USB_KBD_BUFFER_LEN];
130 /* Generic keyboard event polling. */
131 void usb_kbd_generic_poll(void)
133 struct stdio_dev *dev;
134 struct usb_device *usb_kbd_dev;
135 struct usb_kbd_pdata *data;
136 struct usb_interface *iface;
137 struct usb_endpoint_descriptor *ep;
141 /* Get the pointer to USB Keyboard device pointer */
142 dev = stdio_get_by_name(DEVNAME);
143 usb_kbd_dev = (struct usb_device *)dev->priv;
144 data = usb_kbd_dev->privptr;
145 iface = &usb_kbd_dev->config.if_desc[0];
146 ep = &iface->ep_desc[0];
147 pipe = usb_rcvintpipe(usb_kbd_dev, ep->bEndpointAddress);
149 /* Submit a interrupt transfer request */
150 maxp = usb_maxpacket(usb_kbd_dev, pipe);
151 usb_submit_int_msg(usb_kbd_dev, pipe, data->new,
152 maxp > 8 ? 8 : maxp, ep->bInterval);
155 /* Puts character in the queue and sets up the in and out pointer. */
156 static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
158 if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
159 /* Check for buffer full. */
160 if (data->usb_out_pointer == 0)
163 data->usb_in_pointer = 0;
165 /* Check for buffer full. */
166 if (data->usb_in_pointer == data->usb_out_pointer - 1)
169 data->usb_in_pointer++;
172 data->usb_kbd_buffer[data->usb_in_pointer] = c;
176 * Set the LEDs. Since this is used in the irq routine, the control job is
177 * issued with a timeout of 0. This means, that the job is queued without
178 * waiting for job completion.
180 static void usb_kbd_setled(struct usb_device *dev)
182 struct usb_interface *iface = &dev->config.if_desc[0];
183 struct usb_kbd_pdata *data = dev->privptr;
184 uint32_t leds = data->flags & USB_KBD_LEDMASK;
186 usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
187 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
188 0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
191 #define CAPITAL_MASK 0x20
192 /* Translate the scancode in ASCII */
193 static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
194 unsigned char modifier, int pressed)
200 data->repeat_delay = 0;
205 data->repeat_delay++;
206 if (data->repeat_delay < REPEAT_DELAY)
209 data->repeat_delay = REPEAT_DELAY;
212 /* Alphanumeric values */
213 if ((scancode > 3) && (scancode <= 0x1d)) {
214 keycode = scancode - 4 + 'a';
216 if (data->flags & USB_KBD_CAPSLOCK)
217 keycode &= ~CAPITAL_MASK;
219 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
220 /* Handle CAPSLock + Shift pressed simultaneously */
221 if (keycode & CAPITAL_MASK)
222 keycode &= ~CAPITAL_MASK;
224 keycode |= CAPITAL_MASK;
228 if ((scancode > 0x1d) && (scancode < 0x3a)) {
230 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
231 keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
233 keycode = usb_kbd_numkey[scancode - 0x1e];
237 if ((scancode >= 0x4f) && (scancode <= 0x52))
238 keycode = usb_kbd_arrow[scancode - 0x4f];
241 if ((scancode >= 0x54) && (scancode <= 0x67))
242 keycode = usb_kbd_num_keypad[scancode - 0x54];
244 if (data->flags & USB_KBD_CTRL)
245 keycode = scancode - 0x3;
248 if (scancode == NUM_LOCK) {
249 data->flags ^= USB_KBD_NUMLOCK;
253 if (scancode == CAPS_LOCK) {
254 data->flags ^= USB_KBD_CAPSLOCK;
257 if (scancode == SCROLL_LOCK) {
258 data->flags ^= USB_KBD_SCROLLLOCK;
263 /* Report keycode if any */
265 USB_KBD_PRINTF("%c", keycode);
266 usb_kbd_put_queue(data, keycode);
272 static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
275 struct usb_kbd_pdata *data = dev->privptr;
287 if ((old[i] > 3) && (memscan(new + 2, old[i], 6) == new + 8))
288 res |= usb_kbd_translate(data, old[i], data->new[0], up);
293 /* Interrupt service routine */
294 static int usb_kbd_irq_worker(struct usb_device *dev)
296 struct usb_kbd_pdata *data = dev->privptr;
299 /* No combo key pressed */
300 if (data->new[0] == 0x00)
301 data->flags &= ~USB_KBD_CTRL;
302 /* Left or Right Ctrl pressed */
303 else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
304 data->flags |= USB_KBD_CTRL;
306 for (i = 2; i < 8; i++) {
307 res |= usb_kbd_service_key(dev, i, 0);
308 res |= usb_kbd_service_key(dev, i, 1);
311 /* Key is still pressed */
312 if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
313 res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
318 memcpy(data->old, data->new, 8);
323 /* Keyboard interrupt handler */
324 static int usb_kbd_irq(struct usb_device *dev)
326 if ((dev->irq_status != 0) || (dev->irq_act_len != 8)) {
327 USB_KBD_PRINTF("USB KBD: Error %lX, len %d\n",
328 dev->irq_status, dev->irq_act_len);
332 return usb_kbd_irq_worker(dev);
335 /* Interrupt polling */
336 static inline void usb_kbd_poll_for_event(struct usb_device *dev)
338 #if defined(CONFIG_SYS_USB_EVENT_POLL)
339 struct usb_interface *iface;
340 struct usb_endpoint_descriptor *ep;
341 struct usb_kbd_pdata *data;
345 /* Get the pointer to USB Keyboard device pointer */
347 iface = &dev->config.if_desc[0];
348 ep = &iface->ep_desc[0];
349 pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
351 /* Submit a interrupt transfer request */
352 maxp = usb_maxpacket(dev, pipe);
353 usb_submit_int_msg(dev, pipe, &data->new[0],
354 maxp > 8 ? 8 : maxp, ep->bInterval);
356 usb_kbd_irq_worker(dev);
357 #elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
358 struct usb_interface *iface;
359 struct usb_kbd_pdata *data = dev->privptr;
360 iface = &dev->config.if_desc[0];
361 usb_get_report(dev, iface->desc.bInterfaceNumber,
362 1, 0, data->new, sizeof(data->new));
363 if (memcmp(data->old, data->new, sizeof(data->new)))
364 usb_kbd_irq_worker(dev);
368 /* test if a character is in the queue */
369 static int usb_kbd_testc(void)
371 struct stdio_dev *dev;
372 struct usb_device *usb_kbd_dev;
373 struct usb_kbd_pdata *data;
375 dev = stdio_get_by_name(DEVNAME);
376 usb_kbd_dev = (struct usb_device *)dev->priv;
377 data = usb_kbd_dev->privptr;
379 usb_kbd_poll_for_event(usb_kbd_dev);
381 return !(data->usb_in_pointer == data->usb_out_pointer);
384 /* gets the character from the queue */
385 static int usb_kbd_getc(void)
387 struct stdio_dev *dev;
388 struct usb_device *usb_kbd_dev;
389 struct usb_kbd_pdata *data;
391 dev = stdio_get_by_name(DEVNAME);
392 usb_kbd_dev = (struct usb_device *)dev->priv;
393 data = usb_kbd_dev->privptr;
395 while (data->usb_in_pointer == data->usb_out_pointer)
396 usb_kbd_poll_for_event(usb_kbd_dev);
398 if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
399 data->usb_out_pointer = 0;
401 data->usb_out_pointer++;
403 return data->usb_kbd_buffer[data->usb_out_pointer];
406 /* probes the USB device dev for keyboard type. */
407 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
409 struct usb_interface *iface;
410 struct usb_endpoint_descriptor *ep;
411 struct usb_kbd_pdata *data;
414 if (dev->descriptor.bNumConfigurations != 1)
417 iface = &dev->config.if_desc[ifnum];
419 if (iface->desc.bInterfaceClass != 3)
422 if (iface->desc.bInterfaceSubClass != 1)
425 if (iface->desc.bInterfaceProtocol != 1)
428 if (iface->desc.bNumEndpoints != 1)
431 ep = &iface->ep_desc[0];
433 /* Check if endpoint 1 is interrupt endpoint */
434 if (!(ep->bEndpointAddress & 0x80))
437 if ((ep->bmAttributes & 3) != 3)
440 USB_KBD_PRINTF("USB KBD: found set protocol...\n");
442 data = malloc(sizeof(struct usb_kbd_pdata));
444 printf("USB KBD: Error allocating private data\n");
448 /* Clear private data */
449 memset(data, 0, sizeof(struct usb_kbd_pdata));
451 /* allocate input buffer aligned and sized to USB DMA alignment */
452 data->new = memalign(USB_DMA_MINALIGN, roundup(8, USB_DMA_MINALIGN));
454 /* Insert private data into USB device structure */
457 /* Set IRQ handler */
458 dev->irq_handle = usb_kbd_irq;
460 pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
461 maxp = usb_maxpacket(dev, pipe);
463 /* We found a USB Keyboard, install it. */
464 usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
466 USB_KBD_PRINTF("USB KBD: found set idle...\n");
467 usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
469 USB_KBD_PRINTF("USB KBD: enable interrupt pipe...\n");
470 usb_submit_int_msg(dev, pipe, data->new, maxp > 8 ? 8 : maxp,
477 /* Search for keyboard and register it if found. */
478 int drv_usb_kbd_init(void)
480 struct stdio_dev usb_kbd_dev, *old_dev;
481 struct usb_device *dev;
482 char *stdinname = getenv("stdin");
485 /* Scan all USB Devices */
486 for (i = 0; i < USB_MAX_DEVICE; i++) {
487 /* Get USB device. */
488 dev = usb_get_dev_index(i);
492 if (dev->devnum == -1)
495 /* Try probing the keyboard */
496 if (usb_kbd_probe(dev, 0) != 1)
499 /* We found a keyboard, check if it is already registered. */
500 USB_KBD_PRINTF("USB KBD: found set up device.\n");
501 old_dev = stdio_get_by_name(DEVNAME);
503 /* Already registered, just return ok. */
504 USB_KBD_PRINTF("USB KBD: is already registered.\n");
508 /* Register the keyboard */
509 USB_KBD_PRINTF("USB KBD: register.\n");
510 memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
511 strcpy(usb_kbd_dev.name, DEVNAME);
512 usb_kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
513 usb_kbd_dev.putc = NULL;
514 usb_kbd_dev.puts = NULL;
515 usb_kbd_dev.getc = usb_kbd_getc;
516 usb_kbd_dev.tstc = usb_kbd_testc;
517 usb_kbd_dev.priv = (void *)dev;
518 error = stdio_register(&usb_kbd_dev);
522 #ifdef CONFIG_CONSOLE_MUX
523 error = iomux_doenv(stdin, stdinname);
527 /* Check if this is the standard input device. */
528 if (strcmp(stdinname, DEVNAME))
531 /* Reassign the console */
532 if (overwrite_console())
535 error = console_assign(stdin, DEVNAME);
543 /* No USB Keyboard found */
547 /* Deregister the keyboard. */
548 int usb_kbd_deregister(void)
550 #ifdef CONFIG_SYS_STDIO_DEREGISTER
551 return stdio_deregister(DEVNAME);