drivers/hid/hid-waltop.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
15 #include "hid-ids.h"
23  * tablet input mode, switching it between "default", "tablet" and "ink".
25  * This driver only uses "default" mode for all the supported tablets. This
26  * mode tries to be HID-compatible (not very successfully), but cripples the
29  * The "tablet" mode uses some proprietary, yet decipherable protocol, which
30  * represents the correct resolution, but is possibly HID-incompatible (i.e.
33  * The purpose of the "ink" mode is unknown.
35  * The feature reports needed for switching to each mode are these:
38  * 02 16 01     tablet
42 /* Size of the original report descriptor of Slim Tablet 5.8 inch */
45 /* Fixed Slim Tablet 5.8 inch descriptor */
55 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
75 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
93 /* Size of the original report descriptor of Slim Tablet 12.1 inch */
96 /* Fixed Slim Tablet 12.1 inch descriptor */
106 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
126 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
157 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
177 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
195 /* Size of the original report descriptor of tablet with PID 0038 */
199  * Fixed report descriptor for tablet with PID 0038.
210 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
230 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
248 /* Size of the original report descriptor of Media Tablet 10.6 inch */
251 /* Fixed Media Tablet 10.6 inch descriptor */
261 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
281 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
307 	0x15, 0xFF,         /*          Logical Minimum (-1),       */
361 /* Size of the original report descriptor of Media Tablet 14.1 inch */
364 /* Fixed Media Tablet 14.1 inch descriptor */
374 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
394 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
420 	0x15, 0xFF,         /*          Logical Minimum (-1),       */
472 /* Size of the original report descriptor of Sirius Battery Free Tablet */
475 /* Fixed Sirius Battery Free Tablet descriptor */
489 	0x09, 0x46,         /*          Usage (Tablet Pick),        */
503 	0x55, 0xFD,         /*          Unit Exponent (-3),         */
525 	0x55, 0xFE,         /*          Unit Exponent (-2),         */
527 	0x35, 0x97,         /*          Physical Minimum (-105),    */
529 	0x15, 0x97,         /*          Logical Minimum (-105),     */
549 	0x15, 0xFF,         /*          Logical Minimum (-1),       */
605 	switch (hdev->product) {  in waltop_report_fixup()
656 	if (report->type == HID_INPUT_REPORT && report->id == 16 && size >= 8) {  in waltop_raw_event()
670 	/* If this is a pen input report of Sirius Battery Free Tablet */  in waltop_raw_event()
671 	if (hdev->product == USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET &&  in waltop_raw_event()
672 	    report->type == HID_INPUT_REPORT &&  in waltop_raw_event()
673 	    report->id == 16 &&  in waltop_raw_event()
676 		 * The tablet reports tilt as roughly sin(a)*21 (18 means 60  in waltop_raw_event()
689 		s8 sign_x = tilt_x >= 0 ? 1 : -1;  in waltop_raw_event()
690 		s8 sign_y = tilt_y >= 0 ? 1 : -1;  in waltop_raw_event()
700 		sign_y *= -1;  in waltop_raw_event()
703 		 * This effectively clamps reported tilt to 60 degrees - the  in waltop_raw_event()
706 		if (tilt_x > ARRAY_SIZE(tilt_to_radians) - 1)  in waltop_raw_event()
707 			tilt_x = ARRAY_SIZE(tilt_to_radians) - 1;  in waltop_raw_event()
708 		if (tilt_y > ARRAY_SIZE(tilt_to_radians) - 1)  in waltop_raw_event()
709 			tilt_y = ARRAY_SIZE(tilt_to_radians) - 1;  in waltop_raw_event()