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 '|', '~', ':', '"', '~', '<', '>', '?'
91 * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
92 * order. See usb_kbd_setled() function!
94 #define USB_KBD_NUMLOCK (1 << 0)
95 #define USB_KBD_CAPSLOCK (1 << 1)
96 #define USB_KBD_SCROLLLOCK (1 << 2)
97 #define USB_KBD_CTRL (1 << 3)
99 #define USB_KBD_LEDMASK \
100 (USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
102 struct usb_kbd_pdata {
103 uint32_t repeat_delay;
105 uint32_t usb_in_pointer;
106 uint32_t usb_out_pointer;
107 uint8_t usb_kbd_buffer[USB_KBD_BUFFER_LEN];
115 /* Generic keyboard event polling. */
116 void usb_kbd_generic_poll(void)
118 struct stdio_dev *dev;
119 struct usb_device *usb_kbd_dev;
120 struct usb_kbd_pdata *data;
121 struct usb_interface *iface;
122 struct usb_endpoint_descriptor *ep;
126 /* Get the pointer to USB Keyboard device pointer */
127 dev = stdio_get_by_name(DEVNAME);
128 usb_kbd_dev = (struct usb_device *)dev->priv;
129 data = usb_kbd_dev->privptr;
130 iface = &usb_kbd_dev->config.if_desc[0];
131 ep = &iface->ep_desc[0];
132 pipe = usb_rcvintpipe(usb_kbd_dev, ep->bEndpointAddress);
134 /* Submit a interrupt transfer request */
135 maxp = usb_maxpacket(usb_kbd_dev, pipe);
136 usb_submit_int_msg(usb_kbd_dev, pipe, data->new,
137 maxp > 8 ? 8 : maxp, ep->bInterval);
140 /* Puts character in the queue and sets up the in and out pointer. */
141 static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
143 if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
144 /* Check for buffer full. */
145 if (data->usb_out_pointer == 0)
148 data->usb_in_pointer = 0;
150 /* Check for buffer full. */
151 if (data->usb_in_pointer == data->usb_out_pointer - 1)
154 data->usb_in_pointer++;
157 data->usb_kbd_buffer[data->usb_in_pointer] = c;
161 * Set the LEDs. Since this is used in the irq routine, the control job is
162 * issued with a timeout of 0. This means, that the job is queued without
163 * waiting for job completion.
165 static void usb_kbd_setled(struct usb_device *dev)
167 struct usb_interface *iface = &dev->config.if_desc[0];
168 struct usb_kbd_pdata *data = dev->privptr;
169 uint32_t leds = data->flags & USB_KBD_LEDMASK;
171 usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
172 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
173 0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
176 #define CAPITAL_MASK 0x20
177 /* Translate the scancode in ASCII */
178 static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
179 unsigned char modifier, int pressed)
185 data->repeat_delay = 0;
190 data->repeat_delay++;
191 if (data->repeat_delay < REPEAT_DELAY)
194 data->repeat_delay = REPEAT_DELAY;
197 /* Alphanumeric values */
198 if ((scancode > 3) && (scancode <= 0x1d)) {
199 keycode = scancode - 4 + 'a';
201 if (data->flags & USB_KBD_CAPSLOCK)
202 keycode &= ~CAPITAL_MASK;
204 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
205 /* Handle CAPSLock + Shift pressed simultaneously */
206 if (keycode & CAPITAL_MASK)
207 keycode &= ~CAPITAL_MASK;
209 keycode |= CAPITAL_MASK;
213 if ((scancode > 0x1d) && (scancode < 0x3a)) {
215 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
216 keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
218 keycode = usb_kbd_numkey[scancode - 0x1e];
221 if (data->flags & USB_KBD_CTRL)
222 keycode = scancode - 0x3;
225 if (scancode == NUM_LOCK) {
226 data->flags ^= USB_KBD_NUMLOCK;
230 if (scancode == CAPS_LOCK) {
231 data->flags ^= USB_KBD_CAPSLOCK;
234 if (scancode == SCROLL_LOCK) {
235 data->flags ^= USB_KBD_SCROLLLOCK;
240 /* Report keycode if any */
242 USB_KBD_PRINTF("%c", keycode);
243 usb_kbd_put_queue(data, keycode);
249 static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
252 struct usb_kbd_pdata *data = dev->privptr;
264 if ((old[i] > 3) && (memscan(new + 2, old[i], 6) == new + 8))
265 res |= usb_kbd_translate(data, old[i], data->new[0], up);
270 /* Interrupt service routine */
271 static int usb_kbd_irq_worker(struct usb_device *dev)
273 struct usb_kbd_pdata *data = dev->privptr;
276 /* No combo key pressed */
277 if (data->new[0] == 0x00)
278 data->flags &= ~USB_KBD_CTRL;
279 /* Left or Right Ctrl pressed */
280 else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
281 data->flags |= USB_KBD_CTRL;
283 for (i = 2; i < 8; i++) {
284 res |= usb_kbd_service_key(dev, i, 0);
285 res |= usb_kbd_service_key(dev, i, 1);
288 /* Key is still pressed */
289 if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
290 res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
295 memcpy(data->old, data->new, 8);
300 /* Keyboard interrupt handler */
301 static int usb_kbd_irq(struct usb_device *dev)
303 if ((dev->irq_status != 0) || (dev->irq_act_len != 8)) {
304 USB_KBD_PRINTF("USB KBD: Error %lX, len %d\n",
305 dev->irq_status, dev->irq_act_len);
309 return usb_kbd_irq_worker(dev);
312 /* Interrupt polling */
313 static inline void usb_kbd_poll_for_event(struct usb_device *dev)
315 #if defined(CONFIG_SYS_USB_EVENT_POLL)
317 usb_kbd_irq_worker(dev);
318 #elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
319 struct usb_interface *iface;
320 struct usb_kbd_pdata *data = dev->privptr;
321 iface = &dev->config.if_desc[0];
322 usb_get_report(dev, iface->desc.bInterfaceNumber,
323 1, 0, data->new, sizeof(data->new));
324 if (memcmp(data->old, data->new, sizeof(data->new)))
325 usb_kbd_irq_worker(dev);
329 /* test if a character is in the queue */
330 static int usb_kbd_testc(void)
332 struct stdio_dev *dev;
333 struct usb_device *usb_kbd_dev;
334 struct usb_kbd_pdata *data;
336 dev = stdio_get_by_name(DEVNAME);
337 usb_kbd_dev = (struct usb_device *)dev->priv;
338 data = usb_kbd_dev->privptr;
340 usb_kbd_poll_for_event(usb_kbd_dev);
342 return !(data->usb_in_pointer == data->usb_out_pointer);
345 /* gets the character from the queue */
346 static int usb_kbd_getc(void)
348 struct stdio_dev *dev;
349 struct usb_device *usb_kbd_dev;
350 struct usb_kbd_pdata *data;
352 dev = stdio_get_by_name(DEVNAME);
353 usb_kbd_dev = (struct usb_device *)dev->priv;
354 data = usb_kbd_dev->privptr;
356 while (data->usb_in_pointer == data->usb_out_pointer)
357 usb_kbd_poll_for_event(usb_kbd_dev);
359 if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
360 data->usb_out_pointer = 0;
362 data->usb_out_pointer++;
364 return data->usb_kbd_buffer[data->usb_out_pointer];
367 /* probes the USB device dev for keyboard type. */
368 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
370 struct usb_interface *iface;
371 struct usb_endpoint_descriptor *ep;
372 struct usb_kbd_pdata *data;
375 if (dev->descriptor.bNumConfigurations != 1)
378 iface = &dev->config.if_desc[ifnum];
380 if (iface->desc.bInterfaceClass != 3)
383 if (iface->desc.bInterfaceSubClass != 1)
386 if (iface->desc.bInterfaceProtocol != 1)
389 if (iface->desc.bNumEndpoints != 1)
392 ep = &iface->ep_desc[0];
394 /* Check if endpoint 1 is interrupt endpoint */
395 if (!(ep->bEndpointAddress & 0x80))
398 if ((ep->bmAttributes & 3) != 3)
401 USB_KBD_PRINTF("USB KBD: found set protocol...\n");
403 data = malloc(sizeof(struct usb_kbd_pdata));
405 printf("USB KBD: Error allocating private data\n");
409 /* Clear private data */
410 memset(data, 0, sizeof(struct usb_kbd_pdata));
412 /* Insert private data into USB device structure */
415 /* Set IRQ handler */
416 dev->irq_handle = usb_kbd_irq;
418 pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
419 maxp = usb_maxpacket(dev, pipe);
421 /* We found a USB Keyboard, install it. */
422 usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
424 USB_KBD_PRINTF("USB KBD: found set idle...\n");
425 usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
427 USB_KBD_PRINTF("USB KBD: enable interrupt pipe...\n");
428 usb_submit_int_msg(dev, pipe, data->new, maxp > 8 ? 8 : maxp,
435 /* Search for keyboard and register it if found. */
436 int drv_usb_kbd_init(void)
438 struct stdio_dev usb_kbd_dev, *old_dev;
439 struct usb_device *dev;
440 char *stdinname = getenv("stdin");
443 /* Scan all USB Devices */
444 for (i = 0; i < USB_MAX_DEVICE; i++) {
445 /* Get USB device. */
446 dev = usb_get_dev_index(i);
450 if (dev->devnum == -1)
453 /* Try probing the keyboard */
454 if (usb_kbd_probe(dev, 0) != 1)
457 /* We found a keyboard, check if it is already registered. */
458 USB_KBD_PRINTF("USB KBD: found set up device.\n");
459 old_dev = stdio_get_by_name(DEVNAME);
461 /* Already registered, just return ok. */
462 USB_KBD_PRINTF("USB KBD: is already registered.\n");
466 /* Register the keyboard */
467 USB_KBD_PRINTF("USB KBD: register.\n");
468 memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
469 strcpy(usb_kbd_dev.name, DEVNAME);
470 usb_kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
471 usb_kbd_dev.putc = NULL;
472 usb_kbd_dev.puts = NULL;
473 usb_kbd_dev.getc = usb_kbd_getc;
474 usb_kbd_dev.tstc = usb_kbd_testc;
475 usb_kbd_dev.priv = (void *)dev;
476 error = stdio_register(&usb_kbd_dev);
480 /* Check if this is the standard input device. */
481 if (strcmp(stdinname, DEVNAME))
484 /* Reassign the console */
485 if (overwrite_console())
488 error = console_assign(stdin, DEVNAME);
495 /* No USB Keyboard found */
499 /* Deregister the keyboard. */
500 int usb_kbd_deregister(void)
502 #ifdef CONFIG_SYS_STDIO_DEREGISTER
503 return stdio_deregister(DEVNAME);