HID: intel-ish: enable raw interface to HID devices on ISH

Raw interface is often used to update firmwares in HID devices.
We are enabling the interface to support in-field firmware update
for the HID devices attached to ISH.

Signed-off-by: Hyungwoo Yang <hyungwoo.yang@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/intel-ish-hid/ishtp-hid-client.c

@@ -69,13 +69,15 @@ static void process_recv(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
 	unsigned char *payload;
 	struct device_info *dev_info;
 	int i, j;
-	size_t	payload_len, total_len, cur_pos;
+	size_t	payload_len, total_len, cur_pos, raw_len;
 	int report_type;
 	struct report_list *reports_list;
 	char *reports;
 	size_t report_len;
 	struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
 	int curr_hid_dev = client_data->cur_hid_dev;
+	struct ishtp_hid_data *hid_data = NULL;
+	struct hid_device *hid = NULL;
 
 	payload = recv_buf + sizeof(struct hostif_msg_hdr);
 	total_len = data_len;
@@ -219,18 +221,31 @@ do_get_report:
 			/* Get index of device that matches this id */
 			for (i = 0; i < client_data->num_hid_devices; ++i) {
 				if (recv_msg->hdr.device_id ==
-					client_data->hid_devices[i].dev_id)
-					if (client_data->hid_sensor_hubs[i]) {
-						hid_input_report(
-						client_data->hid_sensor_hubs[
-									i],
-						report_type, payload,
-						payload_len, 0);
-						ishtp_hid_wakeup(
-						client_data->hid_sensor_hubs[
-							i]);
+					  client_data->hid_devices[i].dev_id) {
+					hid = client_data->hid_sensor_hubs[i];
+					if (!hid)
 						break;
+
+					hid_data = hid->driver_data;
+					if (hid_data->raw_get_req) {
+						raw_len =
+						  (hid_data->raw_buf_size <
+								payload_len) ?
+						  hid_data->raw_buf_size :
+						  payload_len;
+
+						memcpy(hid_data->raw_buf,
+						       payload, raw_len);
+					} else {
+						hid_input_report
+							(hid, report_type,
+							 payload, payload_len,
+							 0);
 					}
+
+					ishtp_hid_wakeup(hid);
+					break;
+				}
 			}
 			break;
 

drivers/hid/intel-ish-hid/ishtp-hid.c

@@ -59,10 +59,46 @@ static void ishtp_hid_close(struct hid_device *hid)
 {
 }
 
-static int ishtp_raw_request(struct hid_device *hdev, unsigned char reportnum,
-	__u8 *buf, size_t len, unsigned char rtype, int reqtype)
+static int ishtp_raw_request(struct hid_device *hid, unsigned char reportnum,
+			     __u8 *buf, size_t len, unsigned char rtype,
+			     int reqtype)
 {
-	return 0;
+	struct ishtp_hid_data *hid_data =  hid->driver_data;
+	char *ishtp_buf = NULL;
+	size_t ishtp_buf_len;
+	unsigned int header_size = sizeof(struct hostif_msg);
+
+	if (rtype == HID_OUTPUT_REPORT)
+		return -EINVAL;
+
+	hid_data->request_done = false;
+	switch (reqtype) {
+	case HID_REQ_GET_REPORT:
+		hid_data->raw_buf = buf;
+		hid_data->raw_buf_size = len;
+		hid_data->raw_get_req = true;
+
+		hid_ishtp_get_report(hid, reportnum, rtype);
+		break;
+	case HID_REQ_SET_REPORT:
+		/*
+		 * Spare 7 bytes for 64b accesses through
+		 * get/put_unaligned_le64()
+		 */
+		ishtp_buf_len = len + header_size;
+		ishtp_buf = kzalloc(ishtp_buf_len + 7, GFP_KERNEL);
+		if (!ishtp_buf)
+			return -ENOMEM;
+
+		memcpy(ishtp_buf + header_size, buf, len);
+		hid_ishtp_set_feature(hid, ishtp_buf, ishtp_buf_len, reportnum);
+		kfree(ishtp_buf);
+		break;
+	}
+
+	hid_hw_wait(hid);
+
+	return len;
 }
 
 /**
@@ -87,6 +123,7 @@ static void ishtp_hid_request(struct hid_device *hid, struct hid_report *rep,
 	hid_data->request_done = false;
 	switch (reqtype) {
 	case HID_REQ_GET_REPORT:
+		hid_data->raw_get_req = false;
 		hid_ishtp_get_report(hid, rep->id, rep->type);
 		break;
 	case HID_REQ_SET_REPORT:

drivers/hid/intel-ish-hid/ishtp-hid.h

@@ -159,6 +159,9 @@ struct ishtp_cl_data {
  * @client_data:	Link to the client instance
  * @hid_wait:		Completion waitq
  *
+ * @raw_get_req:	Flag indicating raw get request ongoing
+ * @raw_buf:		raw request buffer filled on receiving get report
+ * @raw_buf_size:	raw request buffer size
  * Used to tie hid hid->driver data to driver client instance
  */
 struct ishtp_hid_data {
@@ -166,6 +169,11 @@ struct ishtp_hid_data {
 	bool request_done;
 	struct ishtp_cl_data *client_data;
 	wait_queue_head_t hid_wait;
+
+	/* raw request */
+	bool raw_get_req;
+	u8 *raw_buf;
+	size_t raw_buf_size;
 };
 
 /* Interface functions between HID LL driver and ISH TP client */