linux/drivers/hid/hid-chicony.c
Thomas Weißschuh fe73965d07 HID: change return type of report_fixup() to const
By allowing the drivers to return a "const *" they can constify their
static report arrays.
This makes it clear to driver authors that the HID core will not modify
those reports and they can be reused for multiple devices.
Furthermore security is slightly improved as those reports are protected
against accidental or malicious modifications.

[bentiss: fixup hid-cougar.c and hid-multitouch.c for latest version of
the master branch]

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20240803-hid-const-fixup-v2-6-f53d7a7b29d8@weissschuh.net
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
2024-08-27 16:29:55 +02:00

157 lines
4.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for some chicony "special" devices
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
* Copyright (c) 2006-2007 Jiri Kosina
* Copyright (c) 2007 Paul Walmsley
* Copyright (c) 2008 Jiri Slaby
*/
/*
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
#include "hid-ids.h"
#define CH_WIRELESS_CTL_REPORT_ID 0x11
static int ch_report_wireless(struct hid_report *report, u8 *data, int size)
{
struct hid_device *hdev = report->device;
struct input_dev *input;
if (report->id != CH_WIRELESS_CTL_REPORT_ID || report->maxfield != 1)
return 0;
input = report->field[0]->hidinput->input;
if (!input) {
hid_warn(hdev, "can't find wireless radio control's input");
return 0;
}
input_report_key(input, KEY_RFKILL, 1);
input_sync(input);
input_report_key(input, KEY_RFKILL, 0);
input_sync(input);
return 1;
}
static int ch_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data, int size)
{
if (report->application == HID_GD_WIRELESS_RADIO_CTLS)
return ch_report_wireless(report, data, size);
return 0;
}
#define ch_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
EV_KEY, (c))
static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
return 0;
set_bit(EV_REP, hi->input->evbit);
switch (usage->hid & HID_USAGE) {
case 0xff01: ch_map_key_clear(BTN_1); break;
case 0xff02: ch_map_key_clear(BTN_2); break;
case 0xff03: ch_map_key_clear(BTN_3); break;
case 0xff04: ch_map_key_clear(BTN_4); break;
case 0xff05: ch_map_key_clear(BTN_5); break;
case 0xff06: ch_map_key_clear(BTN_6); break;
case 0xff07: ch_map_key_clear(BTN_7); break;
case 0xff08: ch_map_key_clear(BTN_8); break;
case 0xff09: ch_map_key_clear(BTN_9); break;
case 0xff0a: ch_map_key_clear(BTN_A); break;
case 0xff0b: ch_map_key_clear(BTN_B); break;
case 0x00f1: ch_map_key_clear(KEY_WLAN); break;
case 0x00f2: ch_map_key_clear(KEY_BRIGHTNESSDOWN); break;
case 0x00f3: ch_map_key_clear(KEY_BRIGHTNESSUP); break;
case 0x00f4: ch_map_key_clear(KEY_DISPLAY_OFF); break;
case 0x00f7: ch_map_key_clear(KEY_CAMERA); break;
case 0x00f8: ch_map_key_clear(KEY_PROG1); break;
default:
return 0;
}
return 1;
}
static const __u8 *ch_switch12_report_fixup(struct hid_device *hdev,
__u8 *rdesc, unsigned int *rsize)
{
struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
/* Change usage maximum and logical maximum from 0x7fff to
* 0x2fff, so they don't exceed HID_MAX_USAGES */
switch (hdev->product) {
case USB_DEVICE_ID_CHICONY_ACER_SWITCH12:
if (*rsize >= 128 && rdesc[64] == 0xff && rdesc[65] == 0x7f
&& rdesc[69] == 0xff && rdesc[70] == 0x7f) {
hid_info(hdev, "Fixing up report descriptor\n");
rdesc[65] = rdesc[70] = 0x2f;
}
break;
}
}
return rdesc;
}
static int ch_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
if (!hid_is_usb(hdev))
return -EINVAL;
hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "Chicony hid parse failed: %d\n", ret);
return ret;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(hdev, "Chicony hw start failed: %d\n", ret);
return ret;
}
return 0;
}
static const struct hid_device_id ch_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS3) },
{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
{ }
};
MODULE_DEVICE_TABLE(hid, ch_devices);
static struct hid_driver ch_driver = {
.name = "chicony",
.id_table = ch_devices,
.report_fixup = ch_switch12_report_fixup,
.input_mapping = ch_input_mapping,
.probe = ch_probe,
.raw_event = ch_raw_event,
};
module_hid_driver(ch_driver);
MODULE_DESCRIPTION("HID driver for some chicony \"special\" devices");
MODULE_LICENSE("GPL");