From: Benjamin Tisssoires <benjamin.tissoires@xxxxxxxxxx>
HID++ is a Logitech-specific protocol for communicating with HID
devices. DJ devices implement HID++, and so we can add the HID++
collection in the report descriptor and forward the incoming
reports from the receiver to the appropriate DJ device.
Signed-off-by: Benjamin Tisssoires <benjamin.tissoires@xxxxxxxxxx>
---
drivers/hid/hid-logitech-dj.c | 99 ++++++++++++++++++++++++++++++++++++++++---
drivers/hid/hid-logitech-dj.h | 6 +++
2 files changed, 99 insertions(+), 6 deletions(-)
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index a4b3cee..3444feb 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -152,6 +152,57 @@ static const char media_descriptor[] = {
0xc0, /* EndCollection */
}; /* */
+/* HIDPP descriptor */
+static const char hidpp_descriptor[] = {
+ 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
+ 0x09, 0x01, /* Usage (Vendor Usage 1) */
+ 0xa1, 0x01, /* Collection (Application) */
+ 0x85, 0x10, /* Report ID (16) */
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x06, /* Report Count (6) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00, /* Logical Maximum (255) */
+ 0x09, 0x01, /* Usage (Vendor Usage 1) */
+ 0x81, 0x00, /* Input (Data,Arr,Abs) */
+ 0x09, 0x01, /* Usage (Vendor Usage 1) */
+ 0x91, 0x00, /* Output (Data,Arr,Abs) */
+ 0xc0, /* End Collection */
+ 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
+ 0x09, 0x02, /* Usage (Vendor Usage 2) */
+ 0xa1, 0x01, /* Collection (Application) */
+ 0x85, 0x11, /* Report ID (17) */
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x13, /* Report Count (19) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00, /* Logical Maximum (255) */
+ 0x09, 0x02, /* Usage (Vendor Usage 2) */
+ 0x81, 0x00, /* Input (Data,Arr,Abs) */
+ 0x09, 0x02, /* Usage (Vendor Usage 2) */
+ 0x91, 0x00, /* Output (Data,Arr,Abs) */
+ 0xc0, /* End Collection */
+ 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
+ 0x09, 0x04, /* Usage (Vendor Usage 0x04) */
+ 0xa1, 0x01, /* Collection (Application) */
+ 0x85, 0x20, /* Report ID (32) */
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x0e, /* Report Count (14) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00, /* Logical Maximum (255) */
+ 0x09, 0x41, /* Usage (Vendor Usage 0x41) */
+ 0x81, 0x00, /* Input (Data,Arr,Abs) */
+ 0x09, 0x41, /* Usage (Vendor Usage 0x41) */
+ 0x91, 0x00, /* Output (Data,Arr,Abs) */
+ 0x85, 0x21, /* Report ID (33) */
+ 0x95, 0x1f, /* Report Count (31) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00, /* Logical Maximum (255) */
+ 0x09, 0x42, /* Usage (Vendor Usage 0x42) */
+ 0x81, 0x00, /* Input (Data,Arr,Abs) */
+ 0x09, 0x42, /* Usage (Vendor Usage 0x42) */
+ 0x91, 0x00, /* Output (Data,Arr,Abs) */
+ 0xc0, /* End Collection */
+};
+
/* Maximum size of all defined hid reports in bytes (including report id) */
#define MAX_REPORT_SIZE 8
@@ -161,7 +212,8 @@ static const char media_descriptor[] = {
sizeof(mse_descriptor) + \
sizeof(consumer_descriptor) + \
sizeof(syscontrol_descriptor) + \
- sizeof(media_descriptor))
+ sizeof(media_descriptor) + \
+ sizeof(hidpp_descriptor))
/* Number of possible hid report types that can be created by this driver.
*
@@ -456,6 +508,25 @@ static void logi_dj_recv_forward_report(struct dj_receiver_dev *djrcv_dev,
}
}
+static void logi_dj_recv_forward_hidpp(struct dj_receiver_dev *djrcv_dev,
+ u8 *data, int size)
+{
+ /* We are called from atomic context (tasklet && djrcv->lock held) */
+
+ struct dj_device *dj_dev = NULL;
+ u8 device_index = data[1];
+
+ if ((device_index < DJ_DEVICE_INDEX_MIN) ||
+ (device_index > DJ_DEVICE_INDEX_MAX))
+ return;
+
+ dj_dev = djrcv_dev->paired_dj_devices[device_index];
+
+ if (!dj_dev)
+ return;
+
+ hid_input_report(dj_dev->hdev, HID_INPUT_REPORT, data, size, 1);
+}
static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
@@ -610,6 +681,8 @@ static int logi_dj_ll_parse(struct hid_device *hid)
__func__, djdev->reports_supported);
}
+ rdcat(rdesc, &rsize, hidpp_descriptor, sizeof(hidpp_descriptor));
+
retval = hid_parse_report(hid, rdesc, rsize);
kfree(rdesc);
@@ -701,12 +774,12 @@ static int logi_dj_raw_event(struct hid_device *hdev,
dbg_hid("%s, size:%d\n", __func__, size);
- /* Here we receive all data coming from iface 2, there are 4 cases:
+ /* Here we receive all data coming from iface 2, there are 5 cases:
*
* 1) Data should continue its normal processing i.e. data does not
- * come from the DJ collection, in which case we do nothing and
- * return 0, so hid-core can continue normal processing (will forward
- * to associated hidraw device)
+ * come from the DJ or the HID++ collection, in which case we do nothing
+ * and return 0, so hid-core can continue normal processing (will
+ * forward to associated hidraw device)
*
* 2) Data is from DJ collection, and is intended for this driver i. e.
* data contains arrival, departure, etc notifications, in which case
@@ -723,10 +796,17 @@ static int logi_dj_raw_event(struct hid_device *hdev,
* a paired DJ device in which case we forward it to the correct hid
* device (via hid_input_report() ) and return 1 so hid-core does not do
* anything else with it.
+ *
+ * 5) Data is from the HID++ collection, in this case, we forward the
+ * data to the corresponding child dj device and return 0 to hid-core
+ * so he data also goes to the hidraw device of the receiver. This
+ * allows a user space application to implement the full HID++ routing
+ * via the receiver.
*/
spin_lock_irqsave(&djrcv_dev->lock, flags);
- if (dj_report->report_id == REPORT_ID_DJ_SHORT) {
+ switch (data[0]) {
+ case REPORT_ID_DJ_SHORT:
switch (dj_report->report_type) {
case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
@@ -742,6 +822,13 @@ static int logi_dj_raw_event(struct hid_device *hdev,
logi_dj_recv_forward_report(djrcv_dev, dj_report);
}
report_processed = true;
+ break;
+ case REPORT_ID_HIDPP_SHORT:
+ /* intentional fallthrough */
+ case REPORT_ID_HIDPP_LONG:
+ logi_dj_recv_forward_hidpp(djrcv_dev, data, size);
+ report_processed = false;
+ break;
}
spin_unlock_irqrestore(&djrcv_dev->lock, flags);
diff --git a/drivers/hid/hid-logitech-dj.h b/drivers/hid/hid-logitech-dj.h
index 2e52167..a805d44 100644
--- a/drivers/hid/hid-logitech-dj.h
+++ b/drivers/hid/hid-logitech-dj.h
@@ -36,6 +36,12 @@
#define REPORT_ID_DJ_SHORT 0x20
#define REPORT_ID_DJ_LONG 0x21
+#define REPORT_ID_HIDPP_SHORT 0x10
+#define REPORT_ID_HIDPP_LONG 0x11
+
+#define HIDPP_REPORT_SHORT_LENGTH 7
+#define HIDPP_REPORT_LONG_LENGTH 20
+
#define REPORT_TYPE_RFREPORT_FIRST 0x01
#define REPORT_TYPE_RFREPORT_LAST 0x1F
--
1.8.4.2
--
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