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u-boot/common/usb_kbd.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

673 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland
*
* Part of this source has been derived from the Linux USB
* project.
*/
#include <common.h>
#include <console.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <memalign.h>
#include <stdio_dev.h>
#include <asm/byteorder.h>
#include <usb.h>
/*
* If overwrite_console returns 1, the stdin, stderr and stdout
* are switched to the serial port, else the settings in the
* environment are used
*/
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console(void);
#else
int overwrite_console(void)
{
return 0;
}
#endif
/* Keyboard sampling rate */
#define REPEAT_RATE 40 /* 40msec -> 25cps */
#define REPEAT_DELAY 10 /* 10 x REPEAT_RATE = 400msec */
#define NUM_LOCK 0x53
#define CAPS_LOCK 0x39
#define SCROLL_LOCK 0x47
/* Modifier bits */
#define LEFT_CNTR (1 << 0)
#define LEFT_SHIFT (1 << 1)
#define LEFT_ALT (1 << 2)
#define LEFT_GUI (1 << 3)
#define RIGHT_CNTR (1 << 4)
#define RIGHT_SHIFT (1 << 5)
#define RIGHT_ALT (1 << 6)
#define RIGHT_GUI (1 << 7)
/* Size of the keyboard buffer */
#define USB_KBD_BUFFER_LEN 0x20
/* Device name */
#define DEVNAME "usbkbd"
/* Keyboard maps */
static const unsigned char usb_kbd_numkey[] = {
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
'\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
'\\', '#', ';', '\'', '`', ',', '.', '/'
};
static const unsigned char usb_kbd_numkey_shifted[] = {
'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
'\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
'|', '~', ':', '"', '~', '<', '>', '?'
};
static const unsigned char usb_kbd_num_keypad[] = {
'/', '*', '-', '+', '\r',
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
'.', 0, 0, 0, '='
};
/*
* map arrow keys to ^F/^B ^N/^P, can't really use the proper
* ANSI sequence for arrow keys because the queuing code breaks
* when a single keypress expands to 3 queue elements
*/
static const unsigned char usb_kbd_arrow[] = {
0x6, 0x2, 0xe, 0x10
};
/*
* NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
* order. See usb_kbd_setled() function!
*/
#define USB_KBD_NUMLOCK (1 << 0)
#define USB_KBD_CAPSLOCK (1 << 1)
#define USB_KBD_SCROLLLOCK (1 << 2)
#define USB_KBD_CTRL (1 << 3)
#define USB_KBD_LEDMASK \
(USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
/*
* USB Keyboard reports are 8 bytes in boot protocol.
* Appendix B of HID Device Class Definition 1.11
*/
#define USB_KBD_BOOT_REPORT_SIZE 8
struct usb_kbd_pdata {
unsigned long intpipe;
int intpktsize;
int intinterval;
unsigned long last_report;
struct int_queue *intq;
uint32_t repeat_delay;
uint32_t usb_in_pointer;
uint32_t usb_out_pointer;
uint8_t usb_kbd_buffer[USB_KBD_BUFFER_LEN];
uint8_t *new;
uint8_t old[USB_KBD_BOOT_REPORT_SIZE];
uint8_t flags;
};
extern int __maybe_unused net_busy_flag;
/* The period of time between two calls of usb_kbd_testc(). */
static unsigned long __maybe_unused kbd_testc_tms;
/* Puts character in the queue and sets up the in and out pointer. */
static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
{
if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
/* Check for buffer full. */
if (data->usb_out_pointer == 0)
return;
data->usb_in_pointer = 0;
} else {
/* Check for buffer full. */
if (data->usb_in_pointer == data->usb_out_pointer - 1)
return;
data->usb_in_pointer++;
}
data->usb_kbd_buffer[data->usb_in_pointer] = c;
}
/*
* Set the LEDs. Since this is used in the irq routine, the control job is
* issued with a timeout of 0. This means, that the job is queued without
* waiting for job completion.
*/
static void usb_kbd_setled(struct usb_device *dev)
{
struct usb_interface *iface = &dev->config.if_desc[0];
struct usb_kbd_pdata *data = dev->privptr;
ALLOC_ALIGN_BUFFER(uint32_t, leds, 1, USB_DMA_MINALIGN);
*leds = data->flags & USB_KBD_LEDMASK;
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0x200, iface->desc.bInterfaceNumber, leds, 1, 0);
}
#define CAPITAL_MASK 0x20
/* Translate the scancode in ASCII */
static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
unsigned char modifier, int pressed)
{
uint8_t keycode = 0;
/* Key released */
if (pressed == 0) {
data->repeat_delay = 0;
return 0;
}
if (pressed == 2) {
data->repeat_delay++;
if (data->repeat_delay < REPEAT_DELAY)
return 0;
data->repeat_delay = REPEAT_DELAY;
}
/* Alphanumeric values */
if ((scancode > 3) && (scancode <= 0x1d)) {
keycode = scancode - 4 + 'a';
if (data->flags & USB_KBD_CAPSLOCK)
keycode &= ~CAPITAL_MASK;
if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
/* Handle CAPSLock + Shift pressed simultaneously */
if (keycode & CAPITAL_MASK)
keycode &= ~CAPITAL_MASK;
else
keycode |= CAPITAL_MASK;
}
}
if ((scancode > 0x1d) && (scancode < 0x39)) {
/* Shift pressed */
if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
else
keycode = usb_kbd_numkey[scancode - 0x1e];
}
/* Arrow keys */
if ((scancode >= 0x4f) && (scancode <= 0x52))
keycode = usb_kbd_arrow[scancode - 0x4f];
/* Numeric keypad */
if ((scancode >= 0x54) && (scancode <= 0x67))
keycode = usb_kbd_num_keypad[scancode - 0x54];
if (data->flags & USB_KBD_CTRL)
keycode = scancode - 0x3;
if (pressed == 1) {
if (scancode == NUM_LOCK) {
data->flags ^= USB_KBD_NUMLOCK;
return 1;
}
if (scancode == CAPS_LOCK) {
data->flags ^= USB_KBD_CAPSLOCK;
return 1;
}
if (scancode == SCROLL_LOCK) {
data->flags ^= USB_KBD_SCROLLLOCK;
return 1;
}
}
/* Report keycode if any */
if (keycode) {
debug("%c", keycode);
usb_kbd_put_queue(data, keycode);
}
return 0;
}
static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
{
uint32_t res = 0;
struct usb_kbd_pdata *data = dev->privptr;
uint8_t *new;
uint8_t *old;
if (up) {
new = data->old;
old = data->new;
} else {
new = data->new;
old = data->old;
}
if ((old[i] > 3) &&
(memscan(new + 2, old[i], USB_KBD_BOOT_REPORT_SIZE - 2) ==
new + USB_KBD_BOOT_REPORT_SIZE)) {
res |= usb_kbd_translate(data, old[i], data->new[0], up);
}
return res;
}
/* Interrupt service routine */
static int usb_kbd_irq_worker(struct usb_device *dev)
{
struct usb_kbd_pdata *data = dev->privptr;
int i, res = 0;
/* No combo key pressed */
if (data->new[0] == 0x00)
data->flags &= ~USB_KBD_CTRL;
/* Left or Right Ctrl pressed */
else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
data->flags |= USB_KBD_CTRL;
for (i = 2; i < USB_KBD_BOOT_REPORT_SIZE; i++) {
res |= usb_kbd_service_key(dev, i, 0);
res |= usb_kbd_service_key(dev, i, 1);
}
/* Key is still pressed */
if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
if (res == 1)
usb_kbd_setled(dev);
memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
return 1;
}
/* Keyboard interrupt handler */
static int usb_kbd_irq(struct usb_device *dev)
{
if ((dev->irq_status != 0) ||
(dev->irq_act_len != USB_KBD_BOOT_REPORT_SIZE)) {
debug("USB KBD: Error %lX, len %d\n",
dev->irq_status, dev->irq_act_len);
return 1;
}
return usb_kbd_irq_worker(dev);
}
/* Interrupt polling */
static inline void usb_kbd_poll_for_event(struct usb_device *dev)
{
#if defined(CONFIG_SYS_USB_EVENT_POLL)
struct usb_kbd_pdata *data = dev->privptr;
/* Submit a interrupt transfer request */
usb_submit_int_msg(dev, data->intpipe, &data->new[0], data->intpktsize,
data->intinterval);
usb_kbd_irq_worker(dev);
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) || \
defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
#if defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
struct usb_interface *iface;
struct usb_kbd_pdata *data = dev->privptr;
iface = &dev->config.if_desc[0];
usb_get_report(dev, iface->desc.bInterfaceNumber,
1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE)) {
usb_kbd_irq_worker(dev);
#else
struct usb_kbd_pdata *data = dev->privptr;
if (poll_int_queue(dev, data->intq)) {
usb_kbd_irq_worker(dev);
/* We've consumed all queued int packets, create new */
destroy_int_queue(dev, data->intq);
data->intq = create_int_queue(dev, data->intpipe, 1,
USB_KBD_BOOT_REPORT_SIZE, data->new,
data->intinterval);
#endif
data->last_report = get_timer(0);
/* Repeat last usb hid report every REPEAT_RATE ms for keyrepeat */
} else if (data->last_report != -1 &&
get_timer(data->last_report) > REPEAT_RATE) {
usb_kbd_irq_worker(dev);
data->last_report = get_timer(0);
}
#endif
}
/* test if a character is in the queue */
static int usb_kbd_testc(struct stdio_dev *sdev)
{
struct stdio_dev *dev;
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
#ifdef CONFIG_CMD_NET
/*
* If net_busy_flag is 1, NET transfer is running,
* then we check key-pressed every second (first check may be
* less than 1 second) to improve TFTP booting performance.
*/
if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
return 0;
kbd_testc_tms = get_timer(0);
#endif
dev = stdio_get_by_name(DEVNAME);
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;
usb_kbd_poll_for_event(usb_kbd_dev);
return !(data->usb_in_pointer == data->usb_out_pointer);
}
/* gets the character from the queue */
static int usb_kbd_getc(struct stdio_dev *sdev)
{
struct stdio_dev *dev;
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
dev = stdio_get_by_name(DEVNAME);
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;
while (data->usb_in_pointer == data->usb_out_pointer)
usb_kbd_poll_for_event(usb_kbd_dev);
if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
data->usb_out_pointer = 0;
else
data->usb_out_pointer++;
return data->usb_kbd_buffer[data->usb_out_pointer];
}
/* probes the USB device dev for keyboard type. */
static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum)
{
struct usb_interface *iface;
struct usb_endpoint_descriptor *ep;
struct usb_kbd_pdata *data;
if (dev->descriptor.bNumConfigurations != 1)
return 0;
iface = &dev->config.if_desc[ifnum];
if (iface->desc.bInterfaceClass != USB_CLASS_HID)
return 0;
if (iface->desc.bInterfaceSubClass != USB_SUB_HID_BOOT)
return 0;
if (iface->desc.bInterfaceProtocol != USB_PROT_HID_KEYBOARD)
return 0;
if (iface->desc.bNumEndpoints != 1)
return 0;
ep = &iface->ep_desc[0];
/* Check if endpoint 1 is interrupt endpoint */
if (!(ep->bEndpointAddress & 0x80))
return 0;
if ((ep->bmAttributes & 3) != 3)
return 0;
debug("USB KBD: found set protocol...\n");
data = malloc(sizeof(struct usb_kbd_pdata));
if (!data) {
printf("USB KBD: Error allocating private data\n");
return 0;
}
/* Clear private data */
memset(data, 0, sizeof(struct usb_kbd_pdata));
/* allocate input buffer aligned and sized to USB DMA alignment */
data->new = memalign(USB_DMA_MINALIGN,
roundup(USB_KBD_BOOT_REPORT_SIZE, USB_DMA_MINALIGN));
/* Insert private data into USB device structure */
dev->privptr = data;
/* Set IRQ handler */
dev->irq_handle = usb_kbd_irq;
data->intpipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
data->intpktsize = min(usb_maxpacket(dev, data->intpipe),
USB_KBD_BOOT_REPORT_SIZE);
data->intinterval = ep->bInterval;
data->last_report = -1;
/* We found a USB Keyboard, install it. */
usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
debug("USB KBD: found set idle...\n");
#if !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) && \
!defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE / 4, 0);
#else
usb_set_idle(dev, iface->desc.bInterfaceNumber, 0, 0);
#endif
debug("USB KBD: enable interrupt pipe...\n");
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
data->intq = create_int_queue(dev, data->intpipe, 1,
USB_KBD_BOOT_REPORT_SIZE, data->new,
data->intinterval);
if (!data->intq) {
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
if (usb_get_report(dev, iface->desc.bInterfaceNumber,
1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE) < 0) {
#else
if (usb_submit_int_msg(dev, data->intpipe, data->new, data->intpktsize,
data->intinterval) < 0) {
#endif
printf("Failed to get keyboard state from device %04x:%04x\n",
dev->descriptor.idVendor, dev->descriptor.idProduct);
/* Abort, we don't want to use that non-functional keyboard. */
return 0;
}
/* Success. */
return 1;
}
static int probe_usb_keyboard(struct usb_device *dev)
{
char *stdinname;
struct stdio_dev usb_kbd_dev;
int error;
/* Try probing the keyboard */
if (usb_kbd_probe_dev(dev, 0) != 1)
return -ENOENT;
/* Register the keyboard */
debug("USB KBD: register.\n");
memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
strcpy(usb_kbd_dev.name, DEVNAME);
usb_kbd_dev.flags = DEV_FLAGS_INPUT;
usb_kbd_dev.getc = usb_kbd_getc;
usb_kbd_dev.tstc = usb_kbd_testc;
usb_kbd_dev.priv = (void *)dev;
error = stdio_register(&usb_kbd_dev);
if (error)
return error;
stdinname = env_get("stdin");
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
error = iomux_doenv(stdin, stdinname);
if (error)
return error;
#else
/* Check if this is the standard input device. */
if (strcmp(stdinname, DEVNAME))
return 1;
/* Reassign the console */
if (overwrite_console())
return 1;
error = console_assign(stdin, DEVNAME);
if (error)
return error;
#endif
return 0;
}
#ifndef CONFIG_DM_USB
/* Search for keyboard and register it if found. */
int drv_usb_kbd_init(void)
{
int error, i;
debug("%s: Probing for keyboard\n", __func__);
/* Scan all USB Devices */
for (i = 0; i < USB_MAX_DEVICE; i++) {
struct usb_device *dev;
/* Get USB device. */
dev = usb_get_dev_index(i);
if (!dev)
break;
if (dev->devnum == -1)
continue;
error = probe_usb_keyboard(dev);
if (!error)
return 1;
if (error && error != -ENOENT)
return error;
}
/* No USB Keyboard found */
return -1;
}
/* Deregister the keyboard. */
int usb_kbd_deregister(int force)
{
#if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER)
struct stdio_dev *dev;
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
dev = stdio_get_by_name(DEVNAME);
if (dev) {
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;
if (stdio_deregister_dev(dev, force) != 0)
return 1;
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
if (iomux_doenv(stdin, env_get("stdin")) != 0)
return 1;
#endif
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
destroy_int_queue(usb_kbd_dev, data->intq);
#endif
free(data->new);
free(data);
}
return 0;
#else
return 1;
#endif
}
#endif
#ifdef CONFIG_DM_USB
static int usb_kbd_probe(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
return probe_usb_keyboard(udev);
}
static int usb_kbd_remove(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct usb_kbd_pdata *data;
struct stdio_dev *sdev;
int ret;
sdev = stdio_get_by_name(DEVNAME);
if (!sdev) {
ret = -ENXIO;
goto err;
}
data = udev->privptr;
if (stdio_deregister_dev(sdev, true)) {
ret = -EPERM;
goto err;
}
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
if (iomux_doenv(stdin, env_get("stdin"))) {
ret = -ENOLINK;
goto err;
}
#endif
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
destroy_int_queue(udev, data->intq);
#endif
free(data->new);
free(data);
return 0;
err:
printf("%s: warning, ret=%d", __func__, ret);
return ret;
}
static const struct udevice_id usb_kbd_ids[] = {
{ .compatible = "usb-keyboard" },
{ }
};
U_BOOT_DRIVER(usb_kbd) = {
.name = "usb_kbd",
.id = UCLASS_KEYBOARD,
.of_match = usb_kbd_ids,
.probe = usb_kbd_probe,
.remove = usb_kbd_remove,
};
static const struct usb_device_id kbd_id_table[] = {
{
.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS |
USB_DEVICE_ID_MATCH_INT_PROTOCOL,
.bInterfaceClass = USB_CLASS_HID,
.bInterfaceSubClass = USB_SUB_HID_BOOT,
.bInterfaceProtocol = USB_PROT_HID_KEYBOARD,
},
{ } /* Terminating entry */
};
U_BOOT_USB_DEVICE(usb_kbd, kbd_id_table);
#endif
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