1 // SPDX-License-Identifier: GPL-2.0-only
20  * - when used on some Wacom devices (see the list of attached PIDs), this pen
22  * - to solve that, given that we know that the next event will be the same as
30  * <Tip switch 0> <X 0> <Y 0> <Pressure    0 > <Tooltype 0x0804>
31  * <Tip switch 1> <X 1> <Y 1> <Pressure  100 > <Tooltype 0x0804>
32  * <Tip switch 1> <X 2> <Y 2> <Pressure  100 > <Tooltype 0x0804>
33  * <Tip switch 1> <X 3> <Y 3> <Pressure  200 > <Tooltype 0x0804>
34  * <Tip switch 1> <X 4> <Y 4> <Pressure  200 > <Tooltype 0x0804>
35  * <Tip switch 0> <X 5> <Y 5> <Pressure    0 > <Tooltype 0x0804>
38  * <Tip switch 0> <X 0> <Y 0> <Pressure    0 > <Tooltype 0x0804>
39  * <Tip switch 1> <X 1> <Y 1> <Pressure * 50*> <Tooltype 0x0804>
40  * <Tip switch 1> <X 2> <Y 2> <Pressure  100 > <Tooltype 0x0804>
41  * <Tip switch 1> <X 3> <Y 3> <Pressure *150*> <Tooltype 0x0804>
42  * <Tip switch 1> <X 4> <Y 4> <Pressure  200 > <Tooltype 0x0804>
43  * <Tip switch 0> <X 5> <Y 5> <Pressure    0 > <Tooltype 0x0804>
79 /* HID-BPF reports a 64 bytes chunk anyway, so this ensures
94 static inline __u16 *get_u16(__u8 *data, unsigned int offset)  in get_u16()  argument
96 	return (__u16 *)get_bits(data, offset);  in get_u16()
99 static inline __u8 *get_u8(__u8 *data, unsigned int offset)  in get_u8()  argument
101 	return (__u8 *)get_bits(data, offset);  in get_u8()
107 	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, PEN_REPORT_LEN /* size */);  in SEC()
116 	    params.offsets.pressure >= PEN_REPORT_LEN - 1 ||  in SEC()
117 	    params.offsets.tool_type >= PEN_REPORT_LEN - 1)  in SEC()
154 	hid_ctx = hid_bpf_allocate_context(ctx->hid);  in probe()
156 		ctx->retval = -ENODEV;  in probe()
157 		return -1; /* EPERM check */  in probe()
159 	pid = hid_ctx->hid->product;  in probe()
161 	ctx->retval = -EINVAL;  in probe()
167 		if (device->pid == pid && device->rdesc_len == ctx->rdesc_size) {  in probe()
169 			ctx->retval = 0;  in probe()