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Message-Id: <1295337880-12452-3-git-send-email-alan@signal11.us>
Date: Tue, 18 Jan 2011 03:04:38 -0500
From: Alan Ott <alan@...nal11.us>
To: Jiri Kosina <jkosina@...e.cz>,
Marcel Holtmann <marcel@...tmann.org>,
"Gustavo F. Padovan" <padovan@...fusion.mobi>,
"David S. Miller" <davem@...emloft.net>,
Alan Ott <alan@...nal11.us>,
Michael Poole <mdpoole@...ilus.org>,
Eric Dumazet <eric.dumazet@...il.com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org, linux-bluetooth@...r.kernel.org,
netdev@...r.kernel.org
Cc: Alan Ott <alan@...nal11.us>
Subject: [PATCH v5 2/4] bt hidp: Wait for ACK on Sent Reports
Wait for an ACK from the device before returning from
hidp_output_raw_report(). This way, failures can be returned to the user
application. Also, it prevents ACK/NAK packets from an output packet from
being confused with ACK/NAK packets from an input request packet.
Signed-off-by: Alan Ott <alan@...nal11.us>
---
net/bluetooth/hidp/core.c | 54 ++++++++++++++++++++++++++++++++++++++++++--
net/bluetooth/hidp/hidp.h | 4 +++
2 files changed, 55 insertions(+), 3 deletions(-)
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 67cc4bc..5383e6c 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -316,6 +316,9 @@ static int hidp_send_report(struct hidp_session *session, struct hid_report *rep
static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count,
unsigned char report_type)
{
+ struct hidp_session *session = hid->driver_data;
+ int ret;
+
switch (report_type) {
case HID_FEATURE_REPORT:
report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
@@ -327,10 +330,47 @@ static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, s
return -EINVAL;
}
+ if (mutex_lock_interruptible(&session->report_mutex))
+ return -ERESTARTSYS;
+
+ /* Set up our wait, and send the report request to the device. */
+ set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
if (hidp_send_ctrl_message(hid->driver_data, report_type,
- data, count))
- return -ENOMEM;
- return count;
+ data, count)) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ /* Wait for the ACK from the device. */
+ while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) {
+ int res;
+
+ res = wait_event_interruptible_timeout(session->report_queue,
+ !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags),
+ 10*HZ);
+ if (res == 0) {
+ /* timeout */
+ ret = -EIO;
+ goto err;
+ }
+ if (res < 0) {
+ /* signal */
+ ret = -ERESTARTSYS;
+ goto err;
+ }
+ }
+
+ if (!session->output_report_success) {
+ ret = -EIO;
+ goto err;
+ }
+
+ ret = count;
+
+err:
+ clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
+ mutex_unlock(&session->report_mutex);
+ return ret;
}
static void hidp_idle_timeout(unsigned long arg)
@@ -357,10 +397,12 @@ static void hidp_process_handshake(struct hidp_session *session,
unsigned char param)
{
BT_DBG("session %p param 0x%02x", session, param);
+ session->output_report_success = 0; /* default condition */
switch (param) {
case HIDP_HSHK_SUCCESSFUL:
/* FIXME: Call into SET_ GET_ handlers here */
+ session->output_report_success = 1;
break;
case HIDP_HSHK_NOT_READY:
@@ -385,6 +427,12 @@ static void hidp_process_handshake(struct hidp_session *session,
HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
break;
}
+
+ /* Wake up the waiting thread. */
+ if (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) {
+ clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
+ wake_up_interruptible(&session->report_queue);
+ }
}
static void hidp_process_hid_control(struct hidp_session *session,
diff --git a/net/bluetooth/hidp/hidp.h b/net/bluetooth/hidp/hidp.h
index 2cc35dc..92e093e 100644
--- a/net/bluetooth/hidp/hidp.h
+++ b/net/bluetooth/hidp/hidp.h
@@ -80,6 +80,7 @@
#define HIDP_VIRTUAL_CABLE_UNPLUG 0
#define HIDP_BOOT_PROTOCOL_MODE 1
#define HIDP_BLUETOOTH_VENDOR_ID 9
+#define HIDP_WAITING_FOR_SEND_ACK 11
struct hidp_connadd_req {
int ctrl_sock; // Connected control socket
@@ -154,6 +155,9 @@ struct hidp_session {
struct sk_buff_head ctrl_transmit;
struct sk_buff_head intr_transmit;
+ /* Used in hidp_output_raw_report() */
+ int output_report_success; /* boolean */
+
/* Report descriptor */
__u8 *rd_data;
uint rd_size;
--
1.7.0.4
--
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