HID: hid, make parsing event driven

Next step for complete hid bus, this patch includes:
- call parser either from probe or from hid-core if there is no probe.
- add ll_driver structure and centralize some stuff there (open, close...)
- split and merge usb_hid_configure and hid_probe into several functions
  to allow hooks/fixes between them

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 111 insertions, 82 deletions

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 56a51f9..d8029cf 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -623,9 +623,15 @@ static struct device *hidp_get_device(struct hidp_session *session)
 static int hidp_setup_input(struct hidp_session *session,
 				struct hidp_connadd_req *req)
 {
-	struct input_dev *input = session->input;
+	struct input_dev *input;
 	int i;
 
+	input = input_allocate_device();
+	if (!input)
+		return -ENOMEM;
+
+	session->input = input;
+
 	input_set_drvdata(input, session);
 
 	input->name = "Bluetooth HID Boot Protocol Device";
@@ -698,55 +704,117 @@ static void hidp_setup_quirks(struct hid_device *hid)
 			hid->quirks = hidp_blacklist[n].quirks;
 }
 
+static int hidp_parse(struct hid_device *hid)
+{
+	struct hidp_session *session = hid->driver_data;
+	struct hidp_connadd_req *req = session->req;
+	unsigned char *buf;
+	int ret;
+
+	buf = kmalloc(req->rd_size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	if (copy_from_user(buf, req->rd_data, req->rd_size)) {
+		kfree(buf);
+		return -EFAULT;
+	}
+
+	ret = hid_parse_report(session->hid, buf, req->rd_size);
+
+	kfree(buf);
+
+	if (ret)
+		return ret;
+
+	session->req = NULL;
+
+	hidp_setup_quirks(hid);
+	return 0;
+}
+
+static int hidp_start(struct hid_device *hid)
+{
+	struct hidp_session *session = hid->driver_data;
+	struct hid_report *report;
+
+	list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].
+			report_list, list)
+		hidp_send_report(session, report);
+
+	list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].
+			report_list, list)
+		hidp_send_report(session, report);
+
+	if (hidinput_connect(hid) == 0)
+		hid->claimed |= HID_CLAIMED_INPUT;
+
+	return 0;
+}
+
+static void hidp_stop(struct hid_device *hid)
+{
+	struct hidp_session *session = hid->driver_data;
+
+	skb_queue_purge(&session->ctrl_transmit);
+	skb_queue_purge(&session->intr_transmit);
+
+	if (hid->claimed & HID_CLAIMED_INPUT)
+		hidinput_disconnect(hid);
+	hid->claimed = 0;
+}
+
+static struct hid_ll_driver hidp_hid_driver = {
+	.parse = hidp_parse,
+	.start = hidp_start,
+	.stop = hidp_stop,
+	.open  = hidp_open,
+	.close = hidp_close,
+	.hidinput_input_event = hidp_hidinput_event,
+};
+
 static int hidp_setup_hid(struct hidp_session *session,
 				struct hidp_connadd_req *req)
 {
-	struct hid_device *hid = session->hid;
-	struct hid_report *report;
+	struct hid_device *hid;
 	bdaddr_t src, dst;
 	int ret;
 
-	baswap(&src, &bt_sk(session->ctrl_sock->sk)->src);
-	baswap(&dst, &bt_sk(session->ctrl_sock->sk)->dst);
+	hid = hid_allocate_device();
+	if (IS_ERR(hid)) {
+		ret = PTR_ERR(session->hid);
+		goto err;
+	}
 
+	session->hid = hid;
+	session->req = req;
 	hid->driver_data = session;
 
-	hid->country = req->country;
+	baswap(&src, &bt_sk(session->ctrl_sock->sk)->src);
+	baswap(&dst, &bt_sk(session->ctrl_sock->sk)->dst);
 
 	hid->bus     = BUS_BLUETOOTH;
 	hid->vendor  = req->vendor;
 	hid->product = req->product;
 	hid->version = req->version;
+	hid->country = req->country;
 
 	strncpy(hid->name, req->name, 128);
 	strncpy(hid->phys, batostr(&src), 64);
 	strncpy(hid->uniq, batostr(&dst), 64);
 
 	hid->dev.parent = hidp_get_device(session);
-
-	hid->hid_open  = hidp_open;
-	hid->hid_close = hidp_close;
-
-	hid->hidinput_input_event = hidp_hidinput_event;
-
-	hidp_setup_quirks(hid);
-
-	list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
-		hidp_send_report(session, report);
-
-	list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
-		hidp_send_report(session, report);
-
-	if (hidinput_connect(hid) == 0)
-		hid->claimed |= HID_CLAIMED_INPUT;
+	hid->ll_driver = &hidp_hid_driver;
 
 	ret = hid_add_device(hid);
-	if (ret) {
-		if (hid->claimed & HID_CLAIMED_INPUT)
-			hidinput_disconnect(hid);
-		skb_queue_purge(&session->intr_transmit);
-	}
+	if (ret)
+		goto err_hid;
 
+	return 0;
+err_hid:
+	hid_destroy_device(hid);
+	session->hid = NULL;
+err:
 	return ret;
 }
 
@@ -767,46 +835,6 @@ int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock,
 
 	BT_DBG("rd_data %p rd_size %d", req->rd_data, req->rd_size);
 
-	if (req->rd_size > 0) {
-		unsigned char *buf = kmalloc(req->rd_size, GFP_KERNEL);
-
-		if (!buf) {
-			kfree(session);
-			return -ENOMEM;
-		}
-
-		if (copy_from_user(buf, req->rd_data, req->rd_size)) {
-			kfree(buf);
-			kfree(session);
-			return -EFAULT;
-		}
-
-		session->hid = hid_allocate_device();
-		if (IS_ERR(session->hid)) {
-			kfree(buf);
-			kfree(session);
-			return PTR_ERR(session->hid);
-		}
-
-		err = hid_parse_report(session->hid, buf, req->rd_size);
-
-		kfree(buf);
-
-		if (err) {
-			hid_destroy_device(session->hid);
-			kfree(session);
-			return -EINVAL;
-		}
-	}
-
-	if (!session->hid) {
-		session->input = input_allocate_device();
-		if (!session->input) {
-			kfree(session);
-			return -ENOMEM;
-		}
-	}
-
 	down_write(&hidp_session_sem);
 
 	s = __hidp_get_session(&bt_sk(ctrl_sock->sk)->dst);
@@ -834,16 +862,16 @@ int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock,
 	session->flags   = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
 	session->idle_to = req->idle_to;
 
-	if (session->input) {
-		err = hidp_setup_input(session, req);
-		if (err < 0)
-			goto failed;
-	}
-
-	if (session->hid) {
+	if (req->rd_size > 0) {
 		err = hidp_setup_hid(session, req);
 		if (err)
-			goto failed;
+			goto err_skb;
+	}
+
+	if (!session->hid) {
+		err = hidp_setup_input(session, req);
+		if (err < 0)
+			goto err_skb;
 	}
 
 	__hidp_link_session(session);
@@ -871,16 +899,15 @@ unlink:
 
 	__hidp_unlink_session(session);
 
-	if (session->input) {
+	if (session->input)
 		input_unregister_device(session->input);
-		session->input = NULL; /* don't try to free it here */
-	}
-
-failed:
-	up_write(&hidp_session_sem);
-
 	if (session->hid)
 		hid_destroy_device(session->hid);
+err_skb:
+	skb_queue_purge(&session->ctrl_transmit);
+	skb_queue_purge(&session->intr_transmit);
+failed:
+	up_write(&hidp_session_sem);
 
 	input_free_device(session->input);
 	kfree(session);
diff --git a/net/bluetooth/hidp/hidp.h b/net/bluetooth/hidp/hidp.h
index 343fb05..e503c89 100644
--- a/net/bluetooth/hidp/hidp.h
+++ b/net/bluetooth/hidp/hidp.h
@@ -151,6 +151,8 @@ struct hidp_session {
 
 	struct sk_buff_head ctrl_transmit;
 	struct sk_buff_head intr_transmit;
+
+	struct hidp_connadd_req *req;
 };
 
 static inline void hidp_schedule(struct hidp_session *session)