[PATCH 3/3] Add logitech m560 driver

[Goffredo Baroncelli <kreijack@gmail.com>]

Add logitech m560 support. In the init phase the driver
send a sequence which avoid some unnecessary key sending
from the mouse.

The mouse appears as a couple of mouse and keyboard. Some buttons
emit a key event instead of the "mouse button" event. However
some event (like the middle button release) aren't generated.
Fortunately, the device generates an additional event to
track it. The event type is 0x0a.

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
---
 drivers/hid/hid-logitech-dj.c | 92 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index feddd3d..40c5ea1 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -222,7 +222,99 @@ static inline void call_destroy(struct dj_device *djdev)
 	djdev->methods->destroy(djdev);
 }
 
+/*
+ * Send the sequence 10xx0a35 00af03
+ * to the mouse id xx. It disables the key sending by the central button.
+ */
+
+static int lg_m560_init_device(struct dj_device *dj_device)
+{
+	struct dj_report *dj_report;
+	int retval;
+	static u8 reset_data[] = {0x35, 0x00, 0xaf, 0x03};
+
+	dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
+	if (!dj_report)
+		return -ENOMEM;
+
+	dj_device->userdata = dj_report;
+
+	dj_report->report_id = REPORT_ID_RECV_SHORT;
+	dj_report->device_index = dj_device->device_index;
+	dj_report->report_type = 0x0a;
+
+	memcpy(dj_report->report_params, reset_data, sizeof(reset_data));
+
+	retval = hid_hw_raw_request(dj_device->dj_receiver_dev->hdev,
+		dj_report->report_id,
+		(void *)dj_report, REPORT_ID_RECV_SHORT_LENGTH,
+		HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
+
+	memset(dj_report, 0, sizeof(struct dj_report));
+
+	return retval;
+}
+
+static int lg_m560_parse_raw_event(struct dj_device *dj_device,
+					struct dj_report *dj_report)
+{
+	u8 *m506_last_mouse_report = dj_device->userdata;
+
+	BUG_ON(!dj_device);
+
+	/* don't pass keys when the mouse is a m560 */
+	if (dj_report->report_type == REPORT_TYPE_KEYBOARD)
+		return true;
+
+	if (dj_report->report_id == 0x11 && dj_report->report_type == 0x0a) {
+		int btn;
+
+		/* check if the event is a button */
+		btn = dj_report->report_params[2];
+		if (btn != 0x00 && btn != 0xb0 && btn != 0xae && btn != 0xaf)
+			return true;
+
+		if (btn == 0xaf)
+			m506_last_mouse_report[1] |= 4;
+		if (btn == 0xae)
+			m506_last_mouse_report[2] |= 2;
+		if (btn == 0xb0)
+			m506_last_mouse_report[2] |= 4;
+		if (btn == 0x00) {
+			m506_last_mouse_report[1] &= ~4;
+			m506_last_mouse_report[2] &= ~(4|2);
+		}
+
+		if (hid_input_report(dj_device->hdev, HID_INPUT_REPORT,
+					m506_last_mouse_report, 8, 1)) {
+				dbg_hid("hid_input_report error\n");
+		}
+		return true;
+	}
+
+	/* copy the button status */
+	if (dj_report->report_type == REPORT_TYPE_MOUSE) {
+		/* copy only the first 3 bytes: type, btn0..7, btn8..16 */
+		memcpy(dj_device->userdata,
+			&dj_report->report_type, 3);
+	}
+
+	/* continue with the standard handler */
+	return false;
+}
+
+static void lg_m560_destroy(struct dj_device *dev)
+{
+	kfree(dev->userdata);
+}
+
 static struct dj_device_method dj_device_method[] = {
+	{	/* logitech M560 */
+		.device_names = (char *[]){ "M560", NULL },
+		.init_device = lg_m560_init_device,
+		.parse_raw_event = lg_m560_parse_raw_event,
+		.destroy = lg_m560_destroy
+	},
 
 	/* last element */
 	{ NULL, }
-- 
1.9.3