3 * Denis Peter, MPL AG Switzerland
5 * Part of this source has been derived from the Linux USB
8 * SPDX-License-Identifier: GPL-2.0+
12 #include <stdio_dev.h>
13 #include <asm/byteorder.h>
18 * If overwrite_console returns 1, the stdin, stderr and stdout
19 * are switched to the serial port, else the settings in the
20 * environment are used
22 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
23 extern int overwrite_console(void);
25 int overwrite_console(void)
31 /* Keyboard sampling rate */
32 #define REPEAT_RATE (40 / 4) /* 40msec -> 25cps */
33 #define REPEAT_DELAY 10 /* 10 x REPEAT_RATE = 400msec */
36 #define CAPS_LOCK 0x39
37 #define SCROLL_LOCK 0x47
40 #define LEFT_CNTR (1 << 0)
41 #define LEFT_SHIFT (1 << 1)
42 #define LEFT_ALT (1 << 2)
43 #define LEFT_GUI (1 << 3)
44 #define RIGHT_CNTR (1 << 4)
45 #define RIGHT_SHIFT (1 << 5)
46 #define RIGHT_ALT (1 << 6)
47 #define RIGHT_GUI (1 << 7)
49 /* Size of the keyboard buffer */
50 #define USB_KBD_BUFFER_LEN 0x20
53 #define DEVNAME "usbkbd"
56 static const unsigned char usb_kbd_numkey[] = {
57 '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
58 '\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
59 '\\', '#', ';', '\'', '`', ',', '.', '/'
61 static const unsigned char usb_kbd_numkey_shifted[] = {
62 '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
63 '\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
64 '|', '~', ':', '"', '~', '<', '>', '?'
67 static const unsigned char usb_kbd_num_keypad[] = {
68 '/', '*', '-', '+', '\r',
69 '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
74 * map arrow keys to ^F/^B ^N/^P, can't really use the proper
75 * ANSI sequence for arrow keys because the queuing code breaks
76 * when a single keypress expands to 3 queue elements
78 static const unsigned char usb_kbd_arrow[] = {
83 * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
84 * order. See usb_kbd_setled() function!
86 #define USB_KBD_NUMLOCK (1 << 0)
87 #define USB_KBD_CAPSLOCK (1 << 1)
88 #define USB_KBD_SCROLLLOCK (1 << 2)
89 #define USB_KBD_CTRL (1 << 3)
91 #define USB_KBD_LEDMASK \
92 (USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
95 * USB Keyboard reports are 8 bytes in boot protocol.
96 * Appendix B of HID Device Class Definition 1.11
98 #define USB_KBD_BOOT_REPORT_SIZE 8
100 struct usb_kbd_pdata {
101 uint32_t repeat_delay;
103 uint32_t usb_in_pointer;
104 uint32_t usb_out_pointer;
105 uint8_t usb_kbd_buffer[USB_KBD_BUFFER_LEN];
108 uint8_t old[USB_KBD_BOOT_REPORT_SIZE];
113 extern int __maybe_unused net_busy_flag;
115 /* The period of time between two calls of usb_kbd_testc(). */
116 static unsigned long __maybe_unused kbd_testc_tms;
118 /* Generic keyboard event polling. */
119 void usb_kbd_generic_poll(void)
121 struct stdio_dev *dev;
122 struct usb_device *usb_kbd_dev;
123 struct usb_kbd_pdata *data;
124 struct usb_interface *iface;
125 struct usb_endpoint_descriptor *ep;
129 /* Get the pointer to USB Keyboard device pointer */
130 dev = stdio_get_by_name(DEVNAME);
131 usb_kbd_dev = (struct usb_device *)dev->priv;
132 data = usb_kbd_dev->privptr;
133 iface = &usb_kbd_dev->config.if_desc[0];
134 ep = &iface->ep_desc[0];
135 pipe = usb_rcvintpipe(usb_kbd_dev, ep->bEndpointAddress);
137 /* Submit a interrupt transfer request */
138 maxp = usb_maxpacket(usb_kbd_dev, pipe);
139 usb_submit_int_msg(usb_kbd_dev, pipe, data->new,
140 min(maxp, USB_KBD_BOOT_REPORT_SIZE),
144 /* Puts character in the queue and sets up the in and out pointer. */
145 static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
147 if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
148 /* Check for buffer full. */
149 if (data->usb_out_pointer == 0)
152 data->usb_in_pointer = 0;
154 /* Check for buffer full. */
155 if (data->usb_in_pointer == data->usb_out_pointer - 1)
158 data->usb_in_pointer++;
161 data->usb_kbd_buffer[data->usb_in_pointer] = c;
165 * Set the LEDs. Since this is used in the irq routine, the control job is
166 * issued with a timeout of 0. This means, that the job is queued without
167 * waiting for job completion.
169 static void usb_kbd_setled(struct usb_device *dev)
171 struct usb_interface *iface = &dev->config.if_desc[0];
172 struct usb_kbd_pdata *data = dev->privptr;
173 uint32_t leds = data->flags & USB_KBD_LEDMASK;
175 usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
176 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
177 0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
180 #define CAPITAL_MASK 0x20
181 /* Translate the scancode in ASCII */
182 static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
183 unsigned char modifier, int pressed)
189 data->repeat_delay = 0;
194 data->repeat_delay++;
195 if (data->repeat_delay < REPEAT_DELAY)
198 data->repeat_delay = REPEAT_DELAY;
201 /* Alphanumeric values */
202 if ((scancode > 3) && (scancode <= 0x1d)) {
203 keycode = scancode - 4 + 'a';
205 if (data->flags & USB_KBD_CAPSLOCK)
206 keycode &= ~CAPITAL_MASK;
208 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
209 /* Handle CAPSLock + Shift pressed simultaneously */
210 if (keycode & CAPITAL_MASK)
211 keycode &= ~CAPITAL_MASK;
213 keycode |= CAPITAL_MASK;
217 if ((scancode > 0x1d) && (scancode < 0x3a)) {
219 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
220 keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
222 keycode = usb_kbd_numkey[scancode - 0x1e];
226 if ((scancode >= 0x4f) && (scancode <= 0x52))
227 keycode = usb_kbd_arrow[scancode - 0x4f];
230 if ((scancode >= 0x54) && (scancode <= 0x67))
231 keycode = usb_kbd_num_keypad[scancode - 0x54];
233 if (data->flags & USB_KBD_CTRL)
234 keycode = scancode - 0x3;
237 if (scancode == NUM_LOCK) {
238 data->flags ^= USB_KBD_NUMLOCK;
242 if (scancode == CAPS_LOCK) {
243 data->flags ^= USB_KBD_CAPSLOCK;
246 if (scancode == SCROLL_LOCK) {
247 data->flags ^= USB_KBD_SCROLLLOCK;
252 /* Report keycode if any */
254 debug("%c", keycode);
255 usb_kbd_put_queue(data, keycode);
261 static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
264 struct usb_kbd_pdata *data = dev->privptr;
277 (memscan(new + 2, old[i], USB_KBD_BOOT_REPORT_SIZE - 2) ==
278 new + USB_KBD_BOOT_REPORT_SIZE)) {
279 res |= usb_kbd_translate(data, old[i], data->new[0], up);
285 /* Interrupt service routine */
286 static int usb_kbd_irq_worker(struct usb_device *dev)
288 struct usb_kbd_pdata *data = dev->privptr;
291 /* No combo key pressed */
292 if (data->new[0] == 0x00)
293 data->flags &= ~USB_KBD_CTRL;
294 /* Left or Right Ctrl pressed */
295 else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
296 data->flags |= USB_KBD_CTRL;
298 for (i = 2; i < USB_KBD_BOOT_REPORT_SIZE; i++) {
299 res |= usb_kbd_service_key(dev, i, 0);
300 res |= usb_kbd_service_key(dev, i, 1);
303 /* Key is still pressed */
304 if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
305 res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
310 memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
315 /* Keyboard interrupt handler */
316 static int usb_kbd_irq(struct usb_device *dev)
318 if ((dev->irq_status != 0) ||
319 (dev->irq_act_len != USB_KBD_BOOT_REPORT_SIZE)) {
320 debug("USB KBD: Error %lX, len %d\n",
321 dev->irq_status, dev->irq_act_len);
325 return usb_kbd_irq_worker(dev);
328 /* Interrupt polling */
329 static inline void usb_kbd_poll_for_event(struct usb_device *dev)
331 #if defined(CONFIG_SYS_USB_EVENT_POLL)
332 struct usb_interface *iface;
333 struct usb_endpoint_descriptor *ep;
334 struct usb_kbd_pdata *data;
338 /* Get the pointer to USB Keyboard device pointer */
340 iface = &dev->config.if_desc[0];
341 ep = &iface->ep_desc[0];
342 pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
344 /* Submit a interrupt transfer request */
345 maxp = usb_maxpacket(dev, pipe);
346 usb_submit_int_msg(dev, pipe, &data->new[0],
347 min(maxp, USB_KBD_BOOT_REPORT_SIZE),
350 usb_kbd_irq_worker(dev);
351 #elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
352 struct usb_interface *iface;
353 struct usb_kbd_pdata *data = dev->privptr;
354 iface = &dev->config.if_desc[0];
355 usb_get_report(dev, iface->desc.bInterfaceNumber,
356 1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
357 if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE))
358 usb_kbd_irq_worker(dev);
362 /* test if a character is in the queue */
363 static int usb_kbd_testc(struct stdio_dev *sdev)
365 struct stdio_dev *dev;
366 struct usb_device *usb_kbd_dev;
367 struct usb_kbd_pdata *data;
369 #ifdef CONFIG_CMD_NET
371 * If net_busy_flag is 1, NET transfer is running,
372 * then we check key-pressed every second (first check may be
373 * less than 1 second) to improve TFTP booting performance.
375 if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
377 kbd_testc_tms = get_timer(0);
379 dev = stdio_get_by_name(DEVNAME);
380 usb_kbd_dev = (struct usb_device *)dev->priv;
381 data = usb_kbd_dev->privptr;
383 usb_kbd_poll_for_event(usb_kbd_dev);
385 return !(data->usb_in_pointer == data->usb_out_pointer);
388 /* gets the character from the queue */
389 static int usb_kbd_getc(struct stdio_dev *sdev)
391 struct stdio_dev *dev;
392 struct usb_device *usb_kbd_dev;
393 struct usb_kbd_pdata *data;
395 dev = stdio_get_by_name(DEVNAME);
396 usb_kbd_dev = (struct usb_device *)dev->priv;
397 data = usb_kbd_dev->privptr;
399 while (data->usb_in_pointer == data->usb_out_pointer)
400 usb_kbd_poll_for_event(usb_kbd_dev);
402 if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
403 data->usb_out_pointer = 0;
405 data->usb_out_pointer++;
407 return data->usb_kbd_buffer[data->usb_out_pointer];
410 /* probes the USB device dev for keyboard type. */
411 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
413 struct usb_interface *iface;
414 struct usb_endpoint_descriptor *ep;
415 struct usb_kbd_pdata *data;
418 if (dev->descriptor.bNumConfigurations != 1)
421 iface = &dev->config.if_desc[ifnum];
423 if (iface->desc.bInterfaceClass != 3)
426 if (iface->desc.bInterfaceSubClass != 1)
429 if (iface->desc.bInterfaceProtocol != 1)
432 if (iface->desc.bNumEndpoints != 1)
435 ep = &iface->ep_desc[0];
437 /* Check if endpoint 1 is interrupt endpoint */
438 if (!(ep->bEndpointAddress & 0x80))
441 if ((ep->bmAttributes & 3) != 3)
444 debug("USB KBD: found set protocol...\n");
446 data = malloc(sizeof(struct usb_kbd_pdata));
448 printf("USB KBD: Error allocating private data\n");
452 /* Clear private data */
453 memset(data, 0, sizeof(struct usb_kbd_pdata));
455 /* allocate input buffer aligned and sized to USB DMA alignment */
456 data->new = memalign(USB_DMA_MINALIGN,
457 roundup(USB_KBD_BOOT_REPORT_SIZE, USB_DMA_MINALIGN));
459 /* Insert private data into USB device structure */
462 /* Set IRQ handler */
463 dev->irq_handle = usb_kbd_irq;
465 pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
466 maxp = usb_maxpacket(dev, pipe);
468 /* We found a USB Keyboard, install it. */
469 usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
471 debug("USB KBD: found set idle...\n");
472 usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
474 debug("USB KBD: enable interrupt pipe...\n");
475 if (usb_submit_int_msg(dev, pipe, data->new,
476 min(maxp, USB_KBD_BOOT_REPORT_SIZE),
477 ep->bInterval) < 0) {
478 printf("Failed to get keyboard state from device %04x:%04x\n",
479 dev->descriptor.idVendor, dev->descriptor.idProduct);
480 /* Abort, we don't want to use that non-functional keyboard. */
488 /* Search for keyboard and register it if found. */
489 int drv_usb_kbd_init(void)
491 struct stdio_dev usb_kbd_dev, *old_dev;
492 struct usb_device *dev;
493 char *stdinname = getenv("stdin");
496 /* Scan all USB Devices */
497 for (i = 0; i < USB_MAX_DEVICE; i++) {
498 /* Get USB device. */
499 dev = usb_get_dev_index(i);
503 if (dev->devnum == -1)
506 /* Try probing the keyboard */
507 if (usb_kbd_probe(dev, 0) != 1)
510 /* We found a keyboard, check if it is already registered. */
511 debug("USB KBD: found set up device.\n");
512 old_dev = stdio_get_by_name(DEVNAME);
514 /* Already registered, just return ok. */
515 debug("USB KBD: is already registered.\n");
516 usb_kbd_deregister();
520 /* Register the keyboard */
521 debug("USB KBD: register.\n");
522 memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
523 strcpy(usb_kbd_dev.name, DEVNAME);
524 usb_kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
525 usb_kbd_dev.getc = usb_kbd_getc;
526 usb_kbd_dev.tstc = usb_kbd_testc;
527 usb_kbd_dev.priv = (void *)dev;
528 error = stdio_register(&usb_kbd_dev);
532 #ifdef CONFIG_CONSOLE_MUX
533 error = iomux_doenv(stdin, stdinname);
537 /* Check if this is the standard input device. */
538 if (strcmp(stdinname, DEVNAME))
541 /* Reassign the console */
542 if (overwrite_console())
545 error = console_assign(stdin, DEVNAME);
553 /* No USB Keyboard found */
557 /* Deregister the keyboard. */
558 int usb_kbd_deregister(void)
560 #ifdef CONFIG_SYS_STDIO_DEREGISTER
561 return stdio_deregister(DEVNAME);