1 // SPDX-License-Identifier: GPL-2.0+
2 
3 /*
4  * Quirks for I2C-HID devices that do not supply proper descriptors
5  *
6  * Copyright (c) 2018 Julian Sax <jsbc@gmx.de>
7  *
8  */
9 
10 #include <linux/types.h>
11 #include <linux/dmi.h>
12 #include <linux/mod_devicetable.h>
13 
14 #include "i2c-hid.h"
15 
16 
17 struct i2c_hid_desc_override {
18 	union {
19 		struct i2c_hid_desc *i2c_hid_desc;
20 		uint8_t             *i2c_hid_desc_buffer;
21 	};
22 	uint8_t              *hid_report_desc;
23 	unsigned int          hid_report_desc_size;
24 	uint8_t              *i2c_name;
25 };
26 
27 
28 /*
29  * descriptors for the SIPODEV SP1064 touchpad
30  *
31  * This device does not supply any descriptors and on windows a filter
32  * driver operates between the i2c-hid layer and the device and injects
33  * these descriptors when the device is prompted. The descriptors were
34  * extracted by listening to the i2c-hid traffic that occurs between the
35  * windows filter driver and the windows i2c-hid driver.
36  */
37 
38 static const struct i2c_hid_desc_override sipodev_desc = {
39 	.i2c_hid_desc_buffer = (uint8_t [])
40 	{0x1e, 0x00,                  /* Length of descriptor                 */
41 	 0x00, 0x01,                  /* Version of descriptor                */
42 	 0xdb, 0x01,                  /* Length of report descriptor          */
43 	 0x21, 0x00,                  /* Location of report descriptor        */
44 	 0x24, 0x00,                  /* Location of input report             */
45 	 0x1b, 0x00,                  /* Max input report length              */
46 	 0x25, 0x00,                  /* Location of output report            */
47 	 0x11, 0x00,                  /* Max output report length             */
48 	 0x22, 0x00,                  /* Location of command register         */
49 	 0x23, 0x00,                  /* Location of data register            */
50 	 0x11, 0x09,                  /* Vendor ID                            */
51 	 0x88, 0x52,                  /* Product ID                           */
52 	 0x06, 0x00,                  /* Version ID                           */
53 	 0x00, 0x00, 0x00, 0x00       /* Reserved                             */
54 	},
55 
56 	.hid_report_desc = (uint8_t [])
57 	{0x05, 0x01,                  /* Usage Page (Desktop),                */
58 	 0x09, 0x02,                  /* Usage (Mouse),                       */
59 	 0xA1, 0x01,                  /* Collection (Application),            */
60 	 0x85, 0x01,                  /*     Report ID (1),                   */
61 	 0x09, 0x01,                  /*     Usage (Pointer),                 */
62 	 0xA1, 0x00,                  /*     Collection (Physical),           */
63 	 0x05, 0x09,                  /*         Usage Page (Button),         */
64 	 0x19, 0x01,                  /*         Usage Minimum (01h),         */
65 	 0x29, 0x02,                  /*         Usage Maximum (02h),         */
66 	 0x25, 0x01,                  /*         Logical Maximum (1),         */
67 	 0x75, 0x01,                  /*         Report Size (1),             */
68 	 0x95, 0x02,                  /*         Report Count (2),            */
69 	 0x81, 0x02,                  /*         Input (Variable),            */
70 	 0x95, 0x06,                  /*         Report Count (6),            */
71 	 0x81, 0x01,                  /*         Input (Constant),            */
72 	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
73 	 0x09, 0x30,                  /*         Usage (X),                   */
74 	 0x09, 0x31,                  /*         Usage (Y),                   */
75 	 0x15, 0x81,                  /*         Logical Minimum (-127),      */
76 	 0x25, 0x7F,                  /*         Logical Maximum (127),       */
77 	 0x75, 0x08,                  /*         Report Size (8),             */
78 	 0x95, 0x02,                  /*         Report Count (2),            */
79 	 0x81, 0x06,                  /*         Input (Variable, Relative),  */
80 	 0xC0,                        /*     End Collection,                  */
81 	 0xC0,                        /* End Collection,                      */
82 	 0x05, 0x0D,                  /* Usage Page (Digitizer),              */
83 	 0x09, 0x05,                  /* Usage (Touchpad),                    */
84 	 0xA1, 0x01,                  /* Collection (Application),            */
85 	 0x85, 0x04,                  /*     Report ID (4),                   */
86 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
87 	 0x09, 0x22,                  /*     Usage (Finger),                  */
88 	 0xA1, 0x02,                  /*     Collection (Logical),            */
89 	 0x15, 0x00,                  /*         Logical Minimum (0),         */
90 	 0x25, 0x01,                  /*         Logical Maximum (1),         */
91 	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
92 	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
93 	 0x95, 0x02,                  /*         Report Count (2),            */
94 	 0x75, 0x01,                  /*         Report Size (1),             */
95 	 0x81, 0x02,                  /*         Input (Variable),            */
96 	 0x95, 0x01,                  /*         Report Count (1),            */
97 	 0x75, 0x03,                  /*         Report Size (3),             */
98 	 0x25, 0x05,                  /*         Logical Maximum (5),         */
99 	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
100 	 0x81, 0x02,                  /*         Input (Variable),            */
101 	 0x75, 0x01,                  /*         Report Size (1),             */
102 	 0x95, 0x03,                  /*         Report Count (3),            */
103 	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
104 	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
105 	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
106 	 0x75, 0x10,                  /*         Report Size (16),            */
107 	 0x55, 0x0E,                  /*         Unit Exponent (14),          */
108 	 0x65, 0x11,                  /*         Unit (Centimeter),           */
109 	 0x09, 0x30,                  /*         Usage (X),                   */
110 	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
111 	 0x95, 0x01,                  /*         Report Count (1),            */
112 	 0x81, 0x02,                  /*         Input (Variable),            */
113 	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
114 	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
115 	 0x09, 0x31,                  /*         Usage (Y),                   */
116 	 0x81, 0x02,                  /*         Input (Variable),            */
117 	 0xC0,                        /*     End Collection,                  */
118 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
119 	 0x09, 0x22,                  /*     Usage (Finger),                  */
120 	 0xA1, 0x02,                  /*     Collection (Logical),            */
121 	 0x25, 0x01,                  /*         Logical Maximum (1),         */
122 	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
123 	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
124 	 0x95, 0x02,                  /*         Report Count (2),            */
125 	 0x75, 0x01,                  /*         Report Size (1),             */
126 	 0x81, 0x02,                  /*         Input (Variable),            */
127 	 0x95, 0x01,                  /*         Report Count (1),            */
128 	 0x75, 0x03,                  /*         Report Size (3),             */
129 	 0x25, 0x05,                  /*         Logical Maximum (5),         */
130 	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
131 	 0x81, 0x02,                  /*         Input (Variable),            */
132 	 0x75, 0x01,                  /*         Report Size (1),             */
133 	 0x95, 0x03,                  /*         Report Count (3),            */
134 	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
135 	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
136 	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
137 	 0x75, 0x10,                  /*         Report Size (16),            */
138 	 0x09, 0x30,                  /*         Usage (X),                   */
139 	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
140 	 0x95, 0x01,                  /*         Report Count (1),            */
141 	 0x81, 0x02,                  /*         Input (Variable),            */
142 	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
143 	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
144 	 0x09, 0x31,                  /*         Usage (Y),                   */
145 	 0x81, 0x02,                  /*         Input (Variable),            */
146 	 0xC0,                        /*     End Collection,                  */
147 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
148 	 0x09, 0x22,                  /*     Usage (Finger),                  */
149 	 0xA1, 0x02,                  /*     Collection (Logical),            */
150 	 0x25, 0x01,                  /*         Logical Maximum (1),         */
151 	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
152 	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
153 	 0x95, 0x02,                  /*         Report Count (2),            */
154 	 0x75, 0x01,                  /*         Report Size (1),             */
155 	 0x81, 0x02,                  /*         Input (Variable),            */
156 	 0x95, 0x01,                  /*         Report Count (1),            */
157 	 0x75, 0x03,                  /*         Report Size (3),             */
158 	 0x25, 0x05,                  /*         Logical Maximum (5),         */
159 	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
160 	 0x81, 0x02,                  /*         Input (Variable),            */
161 	 0x75, 0x01,                  /*         Report Size (1),             */
162 	 0x95, 0x03,                  /*         Report Count (3),            */
163 	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
164 	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
165 	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
166 	 0x75, 0x10,                  /*         Report Size (16),            */
167 	 0x09, 0x30,                  /*         Usage (X),                   */
168 	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
169 	 0x95, 0x01,                  /*         Report Count (1),            */
170 	 0x81, 0x02,                  /*         Input (Variable),            */
171 	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
172 	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
173 	 0x09, 0x31,                  /*         Usage (Y),                   */
174 	 0x81, 0x02,                  /*         Input (Variable),            */
175 	 0xC0,                        /*     End Collection,                  */
176 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
177 	 0x09, 0x22,                  /*     Usage (Finger),                  */
178 	 0xA1, 0x02,                  /*     Collection (Logical),            */
179 	 0x25, 0x01,                  /*         Logical Maximum (1),         */
180 	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
181 	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
182 	 0x95, 0x02,                  /*         Report Count (2),            */
183 	 0x75, 0x01,                  /*         Report Size (1),             */
184 	 0x81, 0x02,                  /*         Input (Variable),            */
185 	 0x95, 0x01,                  /*         Report Count (1),            */
186 	 0x75, 0x03,                  /*         Report Size (3),             */
187 	 0x25, 0x05,                  /*         Logical Maximum (5),         */
188 	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
189 	 0x81, 0x02,                  /*         Input (Variable),            */
190 	 0x75, 0x01,                  /*         Report Size (1),             */
191 	 0x95, 0x03,                  /*         Report Count (3),            */
192 	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
193 	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
194 	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
195 	 0x75, 0x10,                  /*         Report Size (16),            */
196 	 0x09, 0x30,                  /*         Usage (X),                   */
197 	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
198 	 0x95, 0x01,                  /*         Report Count (1),            */
199 	 0x81, 0x02,                  /*         Input (Variable),            */
200 	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
201 	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
202 	 0x09, 0x31,                  /*         Usage (Y),                   */
203 	 0x81, 0x02,                  /*         Input (Variable),            */
204 	 0xC0,                        /*     End Collection,                  */
205 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
206 	 0x55, 0x0C,                  /*     Unit Exponent (12),              */
207 	 0x66, 0x01, 0x10,            /*     Unit (Seconds),                  */
208 	 0x47, 0xFF, 0xFF, 0x00, 0x00,/*     Physical Maximum (65535),        */
209 	 0x27, 0xFF, 0xFF, 0x00, 0x00,/*     Logical Maximum (65535),         */
210 	 0x75, 0x10,                  /*     Report Size (16),                */
211 	 0x95, 0x01,                  /*     Report Count (1),                */
212 	 0x09, 0x56,                  /*     Usage (Scan Time),               */
213 	 0x81, 0x02,                  /*     Input (Variable),                */
214 	 0x09, 0x54,                  /*     Usage (Contact Count),           */
215 	 0x25, 0x7F,                  /*     Logical Maximum (127),           */
216 	 0x75, 0x08,                  /*     Report Size (8),                 */
217 	 0x81, 0x02,                  /*     Input (Variable),                */
218 	 0x05, 0x09,                  /*     Usage Page (Button),             */
219 	 0x09, 0x01,                  /*     Usage (01h),                     */
220 	 0x25, 0x01,                  /*     Logical Maximum (1),             */
221 	 0x75, 0x01,                  /*     Report Size (1),                 */
222 	 0x95, 0x01,                  /*     Report Count (1),                */
223 	 0x81, 0x02,                  /*     Input (Variable),                */
224 	 0x95, 0x07,                  /*     Report Count (7),                */
225 	 0x81, 0x03,                  /*     Input (Constant, Variable),      */
226 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
227 	 0x85, 0x02,                  /*     Report ID (2),                   */
228 	 0x09, 0x55,                  /*     Usage (Contact Count Maximum),   */
229 	 0x09, 0x59,                  /*     Usage (59h),                     */
230 	 0x75, 0x04,                  /*     Report Size (4),                 */
231 	 0x95, 0x02,                  /*     Report Count (2),                */
232 	 0x25, 0x0F,                  /*     Logical Maximum (15),            */
233 	 0xB1, 0x02,                  /*     Feature (Variable),              */
234 	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
235 	 0x85, 0x07,                  /*     Report ID (7),                   */
236 	 0x09, 0x60,                  /*     Usage (60h),                     */
237 	 0x75, 0x01,                  /*     Report Size (1),                 */
238 	 0x95, 0x01,                  /*     Report Count (1),                */
239 	 0x25, 0x01,                  /*     Logical Maximum (1),             */
240 	 0xB1, 0x02,                  /*     Feature (Variable),              */
241 	 0x95, 0x07,                  /*     Report Count (7),                */
242 	 0xB1, 0x03,                  /*     Feature (Constant, Variable),    */
243 	 0x85, 0x06,                  /*     Report ID (6),                   */
244 	 0x06, 0x00, 0xFF,            /*     Usage Page (FF00h),              */
245 	 0x09, 0xC5,                  /*     Usage (C5h),                     */
246 	 0x26, 0xFF, 0x00,            /*     Logical Maximum (255),           */
247 	 0x75, 0x08,                  /*     Report Size (8),                 */
248 	 0x96, 0x00, 0x01,            /*     Report Count (256),              */
249 	 0xB1, 0x02,                  /*     Feature (Variable),              */
250 	 0xC0,                        /* End Collection,                      */
251 	 0x06, 0x00, 0xFF,            /* Usage Page (FF00h),                  */
252 	 0x09, 0x01,                  /* Usage (01h),                         */
253 	 0xA1, 0x01,                  /* Collection (Application),            */
254 	 0x85, 0x0D,                  /*     Report ID (13),                  */
255 	 0x26, 0xFF, 0x00,            /*     Logical Maximum (255),           */
256 	 0x19, 0x01,                  /*     Usage Minimum (01h),             */
257 	 0x29, 0x02,                  /*     Usage Maximum (02h),             */
258 	 0x75, 0x08,                  /*     Report Size (8),                 */
259 	 0x95, 0x02,                  /*     Report Count (2),                */
260 	 0xB1, 0x02,                  /*     Feature (Variable),              */
261 	 0xC0,                        /* End Collection,                      */
262 	 0x05, 0x0D,                  /* Usage Page (Digitizer),              */
263 	 0x09, 0x0E,                  /* Usage (Configuration),               */
264 	 0xA1, 0x01,                  /* Collection (Application),            */
265 	 0x85, 0x03,                  /*     Report ID (3),                   */
266 	 0x09, 0x22,                  /*     Usage (Finger),                  */
267 	 0xA1, 0x02,                  /*     Collection (Logical),            */
268 	 0x09, 0x52,                  /*         Usage (Device Mode),         */
269 	 0x25, 0x0A,                  /*         Logical Maximum (10),        */
270 	 0x95, 0x01,                  /*         Report Count (1),            */
271 	 0xB1, 0x02,                  /*         Feature (Variable),          */
272 	 0xC0,                        /*     End Collection,                  */
273 	 0x09, 0x22,                  /*     Usage (Finger),                  */
274 	 0xA1, 0x00,                  /*     Collection (Physical),           */
275 	 0x85, 0x05,                  /*         Report ID (5),               */
276 	 0x09, 0x57,                  /*         Usage (57h),                 */
277 	 0x09, 0x58,                  /*         Usage (58h),                 */
278 	 0x75, 0x01,                  /*         Report Size (1),             */
279 	 0x95, 0x02,                  /*         Report Count (2),            */
280 	 0x25, 0x01,                  /*         Logical Maximum (1),         */
281 	 0xB1, 0x02,                  /*         Feature (Variable),          */
282 	 0x95, 0x06,                  /*         Report Count (6),            */
283 	 0xB1, 0x03,                  /*         Feature (Constant, Variable),*/
284 	 0xC0,                        /*     End Collection,                  */
285 	 0xC0                         /* End Collection                       */
286 	},
287 	.hid_report_desc_size = 475,
288 	.i2c_name = "SYNA3602:00"
289 };
290 
291 
292 static const struct dmi_system_id i2c_hid_dmi_desc_override_table[] = {
293 	{
294 		.ident = "Teclast F6 Pro",
295 		.matches = {
296 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
297 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F6 Pro"),
298 		},
299 		.driver_data = (void *)&sipodev_desc
300 	},
301 	{
302 		.ident = "Teclast F7",
303 		.matches = {
304 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
305 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F7"),
306 		},
307 		.driver_data = (void *)&sipodev_desc
308 	},
309 	{
310 		.ident = "Trekstor Primebook C13",
311 		.matches = {
312 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
313 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C13"),
314 		},
315 		.driver_data = (void *)&sipodev_desc
316 	},
317 	{
318 		.ident = "Trekstor Primebook C11",
319 		.matches = {
320 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
321 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11"),
322 		},
323 		.driver_data = (void *)&sipodev_desc
324 	},
325 	{
326 		/*
327 		 * There are at least 2 Primebook C11B versions, the older
328 		 * version has a product-name of "Primebook C11B", and a
329 		 * bios version / release / firmware revision of:
330 		 * V2.1.2 / 05/03/2018 / 18.2
331 		 * The new version has "PRIMEBOOK C11B" as product-name and a
332 		 * bios version / release / firmware revision of:
333 		 * CFALKSW05_BIOS_V1.1.2 / 11/19/2018 / 19.2
334 		 * Only the older version needs this quirk, note the newer
335 		 * version will not match as it has a different product-name.
336 		 */
337 		.ident = "Trekstor Primebook C11B",
338 		.matches = {
339 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
340 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11B"),
341 		},
342 		.driver_data = (void *)&sipodev_desc
343 	},
344 	{
345 		.ident = "Trekstor SURFBOOK E11B",
346 		.matches = {
347 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
348 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "SURFBOOK E11B"),
349 		},
350 		.driver_data = (void *)&sipodev_desc
351 	},
352 	{
353 		.ident = "Direkt-Tek DTLAPY116-2",
354 		.matches = {
355 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
356 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY116-2"),
357 		},
358 		.driver_data = (void *)&sipodev_desc
359 	},
360 	{
361 		.ident = "Direkt-Tek DTLAPY133-1",
362 		.matches = {
363 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
364 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY133-1"),
365 		},
366 		.driver_data = (void *)&sipodev_desc
367 	},
368 	{
369 		.ident = "Mediacom Flexbook Edge 11",
370 		.matches = {
371 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
372 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook edge11 - M-FBE11"),
373 		},
374 		.driver_data = (void *)&sipodev_desc
375 	},
376 	{
377 		.ident = "Mediacom FlexBook edge 13",
378 		.matches = {
379 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
380 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook_edge13-M-FBE13"),
381 		},
382 		.driver_data = (void *)&sipodev_desc
383 	},
384 	{
385 		.ident = "Odys Winbook 13",
386 		.matches = {
387 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "AXDIA International GmbH"),
388 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "WINBOOK 13"),
389 		},
390 		.driver_data = (void *)&sipodev_desc
391 	},
392 	{
393 		.ident = "iBall Aer3",
394 		.matches = {
395 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "iBall"),
396 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Aer3"),
397 		},
398 		.driver_data = (void *)&sipodev_desc
399 	},
400 	{
401 		.ident = "Schneider SCL142ALM",
402 		.matches = {
403 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "SCHNEIDER"),
404 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "SCL142ALM"),
405 		},
406 		.driver_data = (void *)&sipodev_desc
407 	},
408 	{ }	/* Terminate list */
409 };
410 
411 
412 struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
413 {
414 	struct i2c_hid_desc_override *override;
415 	const struct dmi_system_id *system_id;
416 
417 	system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
418 	if (!system_id)
419 		return NULL;
420 
421 	override = system_id->driver_data;
422 	if (strcmp(override->i2c_name, i2c_name))
423 		return NULL;
424 
425 	return override->i2c_hid_desc;
426 }
427 
428 char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
429 					       unsigned int *size)
430 {
431 	struct i2c_hid_desc_override *override;
432 	const struct dmi_system_id *system_id;
433 
434 	system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
435 	if (!system_id)
436 		return NULL;
437 
438 	override = system_id->driver_data;
439 	if (strcmp(override->i2c_name, i2c_name))
440 		return NULL;
441 
442 	*size = override->hid_report_desc_size;
443 	return override->hid_report_desc;
444 }
445