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Date: Fri, 18 Mar 2022 17:15:25 +0100
From: Benjamin Tissoires <benjamin.tissoires@...hat.com>
To: Greg KH <gregkh@...uxfoundation.org>,
Jiri Kosina <jikos@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
Dave Marchevsky <davemarchevsky@...com>,
Joe Stringer <joe@...ium.io>, Jonathan Corbet <corbet@....net>
Cc: Tero Kristo <tero.kristo@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
netdev@...r.kernel.org, bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org,
Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH bpf-next v3 14/17] HID: add implementation of bpf_hid_raw_request
Hook up BPF to hid_hw_raw_request.
Not much to report here except that we need to export hid_get_report
from hid-core so it gets available in hid-bpf.c
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
changes in v3:
- export HID_*_REPORT definitions in uapi as they are not following
the specs
changes in v2:
- split the series by bpf/libbpf/hid/selftests and samples
---
drivers/hid/hid-bpf.c | 63 ++++++++++++++++++++++++++++++++++++++++
drivers/hid/hid-core.c | 3 +-
include/linux/hid.h | 12 ++------
include/uapi/linux/hid.h | 10 +++++++
4 files changed, 76 insertions(+), 12 deletions(-)
diff --git a/drivers/hid/hid-bpf.c b/drivers/hid/hid-bpf.c
index 650dd5e54919..66724aa2ff42 100644
--- a/drivers/hid/hid-bpf.c
+++ b/drivers/hid/hid-bpf.c
@@ -149,6 +149,68 @@ static int hid_bpf_set_bits(struct hid_device *hdev, u8 *buf, size_t buf_size, u
return n;
}
+static int hid_bpf_raw_request(struct hid_device *hdev, u8 *buf, size_t size,
+ u8 rtype, u8 reqtype)
+{
+ struct hid_report *report;
+ struct hid_report_enum *report_enum;
+ u8 *dma_data;
+ u32 report_len;
+ int ret;
+
+ /* check arguments */
+ switch (rtype) {
+ case HID_INPUT_REPORT:
+ case HID_OUTPUT_REPORT:
+ case HID_FEATURE_REPORT:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (reqtype) {
+ case HID_REQ_GET_REPORT:
+ case HID_REQ_GET_IDLE:
+ case HID_REQ_GET_PROTOCOL:
+ case HID_REQ_SET_REPORT:
+ case HID_REQ_SET_IDLE:
+ case HID_REQ_SET_PROTOCOL:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (size < 1)
+ return -EINVAL;
+
+ report_enum = hdev->report_enum + rtype;
+ report = hid_get_report(report_enum, buf);
+ if (!report)
+ return -EINVAL;
+
+ report_len = hid_report_len(report);
+
+ if (size > report_len)
+ size = report_len;
+
+ dma_data = kmemdup(buf, size, GFP_KERNEL);
+ if (!dma_data)
+ return -ENOMEM;
+
+ ret = hid_hw_raw_request(hdev,
+ dma_data[0],
+ dma_data,
+ size,
+ rtype,
+ reqtype);
+
+ if (ret > 0)
+ memcpy(buf, dma_data, ret);
+
+ kfree(dma_data);
+ return ret;
+}
+
static int hid_bpf_run_progs(struct hid_device *hdev, struct hid_bpf_ctx_kern *ctx)
{
enum bpf_hid_attach_type type;
@@ -252,6 +314,7 @@ int __init hid_bpf_module_init(void)
.array_detach = hid_bpf_array_detach,
.hid_get_bits = hid_bpf_get_bits,
.hid_set_bits = hid_bpf_set_bits,
+ .hid_raw_request = hid_bpf_raw_request,
};
bpf_hid_set_hooks(&hooks);
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 4f669dcddc08..f4b5d22f0831 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1686,8 +1686,7 @@ int hid_set_field(struct hid_field *field, unsigned offset, __s32 value)
}
EXPORT_SYMBOL_GPL(hid_set_field);
-static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
- const u8 *data)
+struct hid_report *hid_get_report(struct hid_report_enum *report_enum, const u8 *data)
{
struct hid_report *report;
unsigned int n = 0; /* Normally report number is 0 */
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 7454e844324c..2f1b40d48265 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -316,15 +316,6 @@ struct hid_item {
#define HID_BAT_ABSOLUTESTATEOFCHARGE 0x00850065
#define HID_VD_ASUS_CUSTOM_MEDIA_KEYS 0xff310076
-/*
- * HID report types --- Ouch! HID spec says 1 2 3!
- */
-
-#define HID_INPUT_REPORT 0
-#define HID_OUTPUT_REPORT 1
-#define HID_FEATURE_REPORT 2
-
-#define HID_REPORT_TYPES 3
/*
* HID connect requests
@@ -344,7 +335,7 @@ struct hid_item {
* HID device quirks.
*/
-/*
+/*
* Increase this if you need to configure more HID quirks at module load time
*/
#define MAX_USBHID_BOOT_QUIRKS 4
@@ -946,6 +937,7 @@ __u32 hid_field_extract(const struct hid_device *hid, __u8 *report,
unsigned offset, unsigned n);
void implement(const struct hid_device *hid, u8 *report, unsigned int offset, unsigned int n,
u32 value);
+struct hid_report *hid_get_report(struct hid_report_enum *report_enum, const u8 *data);
#ifdef CONFIG_PM
int hid_driver_suspend(struct hid_device *hdev, pm_message_t state);
diff --git a/include/uapi/linux/hid.h b/include/uapi/linux/hid.h
index b34492a87a8a..bb690343cf9a 100644
--- a/include/uapi/linux/hid.h
+++ b/include/uapi/linux/hid.h
@@ -42,6 +42,16 @@
#define USB_INTERFACE_PROTOCOL_KEYBOARD 1
#define USB_INTERFACE_PROTOCOL_MOUSE 2
+/*
+ * HID report types --- Ouch! HID spec says 1 2 3!
+ */
+
+#define HID_INPUT_REPORT 0
+#define HID_OUTPUT_REPORT 1
+#define HID_FEATURE_REPORT 2
+
+#define HID_REPORT_TYPES 3
+
/*
* HID class requests
*/
--
2.35.1
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