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linux/drivers/hid/usbhid/usbkbd.c
Vincent Mailhol b45cde330b HID: usbhid: remove third argument of usb_maxpacket() 
The third argument of usb_maxpacket(): in_out has been deprecated
because it could be derived from the second argument (e.g. using
usb_pipeout(pipe)).

N.B. function usb_maxpacket() was made variadic to accommodate the
transition from the old prototype with three arguments to the new one
with only two arguments (so that no renaming is needed). The variadic
argument is to be removed once all users of usb_maxpacket() get
migrated.

CC: Jiri Kosina <jikos@kernel.org>
CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/r/20220317035514.6378-3-mailhol.vincent@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-23 10:33:53 +02:00

399 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 1999-2001 Vojtech Pavlik
*
* USB HIDBP Keyboard support
*/
/*
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <linux/hid.h>
/*
* Version Information
*/
#define DRIVER_VERSION ""
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB HID Boot Protocol keyboard driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
static const unsigned char usb_kbd_keycode[256] = {
0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44, 2, 3,
4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 14, 15, 57, 12, 13, 26,
27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
115,114, 0, 0, 0,121, 0, 89, 93,124, 92, 94, 95, 0, 0, 0,
122,123, 90, 91, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
150,158,159,128,136,177,178,176,142,152,173,140
};
/**
* struct usb_kbd - state of each attached keyboard
* @dev: input device associated with this keyboard
* @usbdev: usb device associated with this keyboard
* @old: data received in the past from the @irq URB representing which
* keys were pressed. By comparing with the current list of keys
* that are pressed, we are able to see key releases.
* @irq: URB for receiving a list of keys that are pressed when a
* new key is pressed or a key that was pressed is released.
* @led: URB for sending LEDs (e.g. numlock, ...)
* @newleds: data that will be sent with the @led URB representing which LEDs
* should be on
* @name: Name of the keyboard. @dev's name field points to this buffer
* @phys: Physical path of the keyboard. @dev's phys field points to this
* buffer
* @new: Buffer for the @irq URB
* @cr: Control request for @led URB
* @leds: Buffer for the @led URB
* @new_dma: DMA address for @irq URB
* @leds_dma: DMA address for @led URB
* @leds_lock: spinlock that protects @leds, @newleds, and @led_urb_submitted
* @led_urb_submitted: indicates whether @led is in progress, i.e. it has been
* submitted and its completion handler has not returned yet
* without resubmitting @led
*/
struct usb_kbd {
struct input_dev *dev;
struct usb_device *usbdev;
unsigned char old[8];
struct urb *irq, *led;
unsigned char newleds;
char name[128];
char phys[64];
unsigned char *new;
struct usb_ctrlrequest *cr;
unsigned char *leds;
dma_addr_t new_dma;
dma_addr_t leds_dma;
spinlock_t leds_lock;
bool led_urb_submitted;
};
static void usb_kbd_irq(struct urb *urb)
{
struct usb_kbd *kbd = urb->context;
int i;
switch (urb->status) {
case 0: /* success */
break;
case -ECONNRESET: /* unlink */
case -ENOENT:
case -ESHUTDOWN:
return;
/* -EPIPE: should clear the halt */
default: /* error */
goto resubmit;
}
for (i = 0; i < 8; i++)
input_report_key(kbd->dev, usb_kbd_keycode[i + 224], (kbd->new[0] >> i) & 1);
for (i = 2; i < 8; i++) {
if (kbd->old[i] > 3 && memscan(kbd->new + 2, kbd->old[i], 6) == kbd->new + 8) {
if (usb_kbd_keycode[kbd->old[i]])
input_report_key(kbd->dev, usb_kbd_keycode[kbd->old[i]], 0);
else
hid_info(urb->dev,
"Unknown key (scancode %#x) released.\n",
kbd->old[i]);
}
if (kbd->new[i] > 3 && memscan(kbd->old + 2, kbd->new[i], 6) == kbd->old + 8) {
if (usb_kbd_keycode[kbd->new[i]])
input_report_key(kbd->dev, usb_kbd_keycode[kbd->new[i]], 1);
else
hid_info(urb->dev,
"Unknown key (scancode %#x) pressed.\n",
kbd->new[i]);
}
}
input_sync(kbd->dev);
memcpy(kbd->old, kbd->new, 8);
resubmit:
i = usb_submit_urb (urb, GFP_ATOMIC);
if (i)
hid_err(urb->dev, "can't resubmit intr, %s-%s/input0, status %d",
kbd->usbdev->bus->bus_name,
kbd->usbdev->devpath, i);
}
static int usb_kbd_event(struct input_dev *dev, unsigned int type,
unsigned int code, int value)
{
unsigned long flags;
struct usb_kbd *kbd = input_get_drvdata(dev);
if (type != EV_LED)
return -1;
spin_lock_irqsave(&kbd->leds_lock, flags);
kbd->newleds = (!!test_bit(LED_KANA, dev->led) << 3) | (!!test_bit(LED_COMPOSE, dev->led) << 3) |
(!!test_bit(LED_SCROLLL, dev->led) << 2) | (!!test_bit(LED_CAPSL, dev->led) << 1) |
(!!test_bit(LED_NUML, dev->led));
if (kbd->led_urb_submitted){
spin_unlock_irqrestore(&kbd->leds_lock, flags);
return 0;
}
if (*(kbd->leds) == kbd->newleds){
spin_unlock_irqrestore(&kbd->leds_lock, flags);
return 0;
}
*(kbd->leds) = kbd->newleds;
kbd->led->dev = kbd->usbdev;
if (usb_submit_urb(kbd->led, GFP_ATOMIC))
pr_err("usb_submit_urb(leds) failed\n");
else
kbd->led_urb_submitted = true;
spin_unlock_irqrestore(&kbd->leds_lock, flags);
return 0;
}
static void usb_kbd_led(struct urb *urb)
{
unsigned long flags;
struct usb_kbd *kbd = urb->context;
if (urb->status)
hid_warn(urb->dev, "led urb status %d received\n",
urb->status);
spin_lock_irqsave(&kbd->leds_lock, flags);
if (*(kbd->leds) == kbd->newleds){
kbd->led_urb_submitted = false;
spin_unlock_irqrestore(&kbd->leds_lock, flags);
return;
}
*(kbd->leds) = kbd->newleds;
kbd->led->dev = kbd->usbdev;
if (usb_submit_urb(kbd->led, GFP_ATOMIC)){
hid_err(urb->dev, "usb_submit_urb(leds) failed\n");
kbd->led_urb_submitted = false;
}
spin_unlock_irqrestore(&kbd->leds_lock, flags);
}
static int usb_kbd_open(struct input_dev *dev)
{
struct usb_kbd *kbd = input_get_drvdata(dev);
kbd->irq->dev = kbd->usbdev;
if (usb_submit_urb(kbd->irq, GFP_KERNEL))
return -EIO;
return 0;
}
static void usb_kbd_close(struct input_dev *dev)
{
struct usb_kbd *kbd = input_get_drvdata(dev);
usb_kill_urb(kbd->irq);
}
static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
{
if (!(kbd->irq = usb_alloc_urb(0, GFP_KERNEL)))
return -1;
if (!(kbd->led = usb_alloc_urb(0, GFP_KERNEL)))
return -1;
if (!(kbd->new = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbd->new_dma)))
return -1;
if (!(kbd->cr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
return -1;
if (!(kbd->leds = usb_alloc_coherent(dev, 1, GFP_KERNEL, &kbd->leds_dma)))
return -1;
return 0;
}
static void usb_kbd_free_mem(struct usb_device *dev, struct usb_kbd *kbd)
{
usb_free_urb(kbd->irq);
usb_free_urb(kbd->led);
usb_free_coherent(dev, 8, kbd->new, kbd->new_dma);
kfree(kbd->cr);
usb_free_coherent(dev, 1, kbd->leds, kbd->leds_dma);
}
static int usb_kbd_probe(struct usb_interface *iface,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(iface);
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_kbd *kbd;
struct input_dev *input_dev;
int i, pipe, maxp;
int error = -ENOMEM;
interface = iface->cur_altsetting;
if (interface->desc.bNumEndpoints != 1)
return -ENODEV;
endpoint = &interface->endpoint[0].desc;
if (!usb_endpoint_is_int_in(endpoint))
return -ENODEV;
pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
maxp = usb_maxpacket(dev, pipe);
kbd = kzalloc(sizeof(struct usb_kbd), GFP_KERNEL);
input_dev = input_allocate_device();
if (!kbd || !input_dev)
goto fail1;
if (usb_kbd_alloc_mem(dev, kbd))
goto fail2;
kbd->usbdev = dev;
kbd->dev = input_dev;
spin_lock_init(&kbd->leds_lock);
if (dev->manufacturer)
strlcpy(kbd->name, dev->manufacturer, sizeof(kbd->name));
if (dev->product) {
if (dev->manufacturer)
strlcat(kbd->name, " ", sizeof(kbd->name));
strlcat(kbd->name, dev->product, sizeof(kbd->name));
}
if (!strlen(kbd->name))
snprintf(kbd->name, sizeof(kbd->name),
"USB HIDBP Keyboard %04x:%04x",
le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct));
usb_make_path(dev, kbd->phys, sizeof(kbd->phys));
strlcat(kbd->phys, "/input0", sizeof(kbd->phys));
input_dev->name = kbd->name;
input_dev->phys = kbd->phys;
usb_to_input_id(dev, &input_dev->id);
input_dev->dev.parent = &iface->dev;
input_set_drvdata(input_dev, kbd);
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
BIT_MASK(EV_REP);
input_dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
BIT_MASK(LED_SCROLLL) | BIT_MASK(LED_COMPOSE) |
BIT_MASK(LED_KANA);
for (i = 0; i < 255; i++)
set_bit(usb_kbd_keycode[i], input_dev->keybit);
clear_bit(0, input_dev->keybit);
input_dev->event = usb_kbd_event;
input_dev->open = usb_kbd_open;
input_dev->close = usb_kbd_close;
usb_fill_int_urb(kbd->irq, dev, pipe,
kbd->new, (maxp > 8 ? 8 : maxp),
usb_kbd_irq, kbd, endpoint->bInterval);
kbd->irq->transfer_dma = kbd->new_dma;
kbd->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
kbd->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
kbd->cr->bRequest = 0x09;
kbd->cr->wValue = cpu_to_le16(0x200);
kbd->cr->wIndex = cpu_to_le16(interface->desc.bInterfaceNumber);
kbd->cr->wLength = cpu_to_le16(1);
usb_fill_control_urb(kbd->led, dev, usb_sndctrlpipe(dev, 0),
(void *) kbd->cr, kbd->leds, 1,
usb_kbd_led, kbd);
kbd->led->transfer_dma = kbd->leds_dma;
kbd->led->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
error = input_register_device(kbd->dev);
if (error)
goto fail2;
usb_set_intfdata(iface, kbd);
device_set_wakeup_enable(&dev->dev, 1);
return 0;
fail2:
usb_kbd_free_mem(dev, kbd);
fail1:
input_free_device(input_dev);
kfree(kbd);
return error;
}
static void usb_kbd_disconnect(struct usb_interface *intf)
{
struct usb_kbd *kbd = usb_get_intfdata (intf);
usb_set_intfdata(intf, NULL);
if (kbd) {
usb_kill_urb(kbd->irq);
input_unregister_device(kbd->dev);
usb_kill_urb(kbd->led);
usb_kbd_free_mem(interface_to_usbdev(intf), kbd);
kfree(kbd);
}
}
static const struct usb_device_id usb_kbd_id_table[] = {
{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
USB_INTERFACE_PROTOCOL_KEYBOARD) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, usb_kbd_id_table);
static struct usb_driver usb_kbd_driver = {
.name = "usbkbd",
.probe = usb_kbd_probe,
.disconnect = usb_kbd_disconnect,
.id_table = usb_kbd_id_table,
};
module_usb_driver(usb_kbd_driver);
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