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linux/drivers/hid/wacom.h
Jason Gerecke ff479731c3 HID: wacom: generic: Treat serial number and related fields as unsigned 
The HID descriptors for most Wacom devices oddly declare the serial
number and other related fields as signed integers. When these numbers
are ingested by the HID subsystem, they are automatically sign-extended
into 32-bit integers. We treat the fields as unsigned elsewhere in the
kernel and userspace, however, so this sign-extension causes problems.
In particular, the sign-extended tool ID sent to userspace as ABS_MISC
does not properly match unsigned IDs used by xf86-input-wacom and libwacom.

We introduce a function 'wacom_s32tou' that can undo the automatic sign
extension performed by 'hid_snto32'. We call this function when processing
the serial number and related fields to ensure that we are dealing with
and reporting the unsigned form. We opt to use this method rather than
adding a descriptor fixup in 'wacom_hid_usage_quirk' since it should be
more robust in the face of future devices.

Ref: https://github.com/linuxwacom/input-wacom/issues/134
Fixes: f85c9dc678 ("HID: wacom: generic: Support tool ID and additional tool types")
CC: <stable@vger.kernel.org> # v4.10+
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2019-11-06 21:37:29 +01:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* drivers/input/tablet/wacom.h
*
* USB Wacom tablet support
*
* Copyright (c) 2000-2004 Vojtech Pavlik <vojtech@ucw.cz>
* Copyright (c) 2000 Andreas Bach Aaen <abach@stofanet.dk>
* Copyright (c) 2000 Clifford Wolf <clifford@clifford.at>
* Copyright (c) 2000 Sam Mosel <sam.mosel@computer.org>
* Copyright (c) 2000 James E. Blair <corvus@gnu.org>
* Copyright (c) 2000 Daniel Egger <egger@suse.de>
* Copyright (c) 2001 Frederic Lepied <flepied@mandrakesoft.com>
* Copyright (c) 2004 Panagiotis Issaris <panagiotis.issaris@mech.kuleuven.ac.be>
* Copyright (c) 2002-2011 Ping Cheng <pingc@wacom.com>
* Copyright (c) 2014 Benjamin Tissoires <benjamin.tissoires@redhat.com>
*
* ChangeLog:
* v0.1 (vp) - Initial release
* v0.2 (aba) - Support for all buttons / combinations
* v0.3 (vp) - Support for Intuos added
* v0.4 (sm) - Support for more Intuos models, menustrip
* relative mode, proximity.
* v0.5 (vp) - Big cleanup, nifty features removed,
* they belong in userspace
* v1.8 (vp) - Submit URB only when operating, moved to CVS,
* use input_report_key instead of report_btn and
* other cleanups
* v1.11 (vp) - Add URB ->dev setting for new kernels
* v1.11 (jb) - Add support for the 4D Mouse & Lens
* v1.12 (de) - Add support for two more inking pen IDs
* v1.14 (vp) - Use new USB device id probing scheme.
* Fix Wacom Graphire mouse wheel
* v1.18 (vp) - Fix mouse wheel direction
* Make mouse relative
* v1.20 (fl) - Report tool id for Intuos devices
* - Multi tools support
* - Corrected Intuos protocol decoding (airbrush, 4D mouse, lens cursor...)
* - Add PL models support
* - Fix Wacom Graphire mouse wheel again
* v1.21 (vp) - Removed protocol descriptions
* - Added MISC_SERIAL for tool serial numbers
* (gb) - Identify version on module load.
* v1.21.1 (fl) - added Graphire2 support
* v1.21.2 (fl) - added Intuos2 support
* - added all the PL ids
* v1.21.3 (fl) - added another eraser id from Neil Okamoto
* - added smooth filter for Graphire from Peri Hankey
* - added PenPartner support from Olaf van Es
* - new tool ids from Ole Martin Bjoerndalen
* v1.29 (pc) - Add support for more tablets
* - Fix pressure reporting
* v1.30 (vp) - Merge 2.4 and 2.5 drivers
* - Since 2.5 now has input_sync(), remove MSC_SERIAL abuse
* - Cleanups here and there
* v1.30.1 (pi) - Added Graphire3 support
* v1.40 (pc) - Add support for several new devices, fix eraser reporting, ...
* v1.43 (pc) - Added support for Cintiq 21UX
* - Fixed a Graphire bug
* - Merged wacom_intuos3_irq into wacom_intuos_irq
* v1.44 (pc) - Added support for Graphire4, Cintiq 710, Intuos3 6x11, etc.
* - Report Device IDs
* v1.45 (pc) - Added support for DTF 521, Intuos3 12x12 and 12x19
* - Minor data report fix
* v1.46 (pc) - Split wacom.c into wacom_sys.c and wacom_wac.c,
* - where wacom_sys.c deals with system specific code,
* - and wacom_wac.c deals with Wacom specific code
* - Support Intuos3 4x6
* v1.47 (pc) - Added support for Bamboo
* v1.48 (pc) - Added support for Bamboo1, BambooFun, and Cintiq 12WX
* v1.49 (pc) - Added support for USB Tablet PC (0x90, 0x93, and 0x9A)
* v1.50 (pc) - Fixed a TabletPC touch bug in 2.6.28
* v1.51 (pc) - Added support for Intuos4
* v1.52 (pc) - Query Wacom data upon system resume
* - add defines for features->type
* - add new devices (0x9F, 0xE2, and 0XE3)
* v2.00 (bt) - conversion to a HID driver
* - integration of the Bluetooth devices
*/
/*
*/
#ifndef WACOM_H
#define WACOM_H
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/hid.h>
#include <linux/kfifo.h>
#include <linux/leds.h>
#include <linux/usb/input.h>
#include <linux/power_supply.h>
#include <asm/unaligned.h>
/*
* Version Information
*/
#define DRIVER_VERSION "v2.00"
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB Wacom tablet driver"
#define USB_VENDOR_ID_WACOM 0x056a
#define USB_VENDOR_ID_LENOVO 0x17ef
enum wacom_worker {
WACOM_WORKER_WIRELESS,
WACOM_WORKER_BATTERY,
WACOM_WORKER_REMOTE,
WACOM_WORKER_MODE_CHANGE,
};
struct wacom;
struct wacom_led {
struct led_classdev cdev;
struct led_trigger trigger;
struct wacom *wacom;
unsigned int group;
unsigned int id;
u8 llv;
u8 hlv;
bool held;
};
struct wacom_group_leds {
u8 select; /* status led selector (0..3) */
struct wacom_led *leds;
unsigned int count;
struct device *dev;
};
struct wacom_battery {
struct wacom *wacom;
struct power_supply_desc bat_desc;
struct power_supply *battery;
char bat_name[WACOM_NAME_MAX];
int bat_status;
int battery_capacity;
int bat_charging;
int bat_connected;
int ps_connected;
};
struct wacom_remote {
spinlock_t remote_lock;
struct kfifo remote_fifo;
struct kobject *remote_dir;
struct {
struct attribute_group group;
u32 serial;
struct input_dev *input;
bool registered;
struct wacom_battery battery;
} remotes[WACOM_MAX_REMOTES];
};
struct wacom {
struct usb_device *usbdev;
struct usb_interface *intf;
struct wacom_wac wacom_wac;
struct hid_device *hdev;
struct mutex lock;
struct work_struct wireless_work;
struct work_struct battery_work;
struct work_struct remote_work;
struct delayed_work init_work;
struct wacom_remote *remote;
struct work_struct mode_change_work;
bool generic_has_leds;
struct wacom_leds {
struct wacom_group_leds *groups;
unsigned int count;
u8 llv; /* status led brightness no button (1..127) */
u8 hlv; /* status led brightness button pressed (1..127) */
u8 img_lum; /* OLED matrix display brightness */
u8 max_llv; /* maximum brightness of LED (llv) */
u8 max_hlv; /* maximum brightness of LED (hlv) */
} led;
struct wacom_battery battery;
bool resources;
};
static inline void wacom_schedule_work(struct wacom_wac *wacom_wac,
enum wacom_worker which)
{
struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
switch (which) {
case WACOM_WORKER_WIRELESS:
schedule_work(&wacom->wireless_work);
break;
case WACOM_WORKER_BATTERY:
schedule_work(&wacom->battery_work);
break;
case WACOM_WORKER_REMOTE:
schedule_work(&wacom->remote_work);
break;
case WACOM_WORKER_MODE_CHANGE:
schedule_work(&wacom->mode_change_work);
break;
}
}
/*
* Convert a signed 32-bit integer to an unsigned n-bit integer. Undoes
* the normally-helpful work of 'hid_snto32' for fields that use signed
* ranges for questionable reasons.
*/
static inline __u32 wacom_s32tou(s32 value, __u8 n)
{
switch (n) {
case 8: return ((__u8)value);
case 16: return ((__u16)value);
case 32: return ((__u32)value);
}
return value & (1 << (n - 1)) ? value & (~(~0U << n)) : value;
}
extern const struct hid_device_id wacom_ids[];
void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len);
void wacom_setup_device_quirks(struct wacom *wacom);
int wacom_setup_pen_input_capabilities(struct input_dev *input_dev,
struct wacom_wac *wacom_wac);
int wacom_setup_touch_input_capabilities(struct input_dev *input_dev,
struct wacom_wac *wacom_wac);
int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
struct wacom_wac *wacom_wac);
void wacom_wac_usage_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage);
void wacom_wac_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value);
void wacom_wac_report(struct hid_device *hdev, struct hid_report *report);
void wacom_battery_work(struct work_struct *work);
enum led_brightness wacom_leds_brightness_get(struct wacom_led *led);
struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group,
unsigned int id);
struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur);
int wacom_equivalent_usage(int usage);
int wacom_initialize_leds(struct wacom *wacom);
#endif
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