diff options
| author | Alan Ott | 2011-01-18 09:04:38 +0100 |
|---|---|---|
| committer | Jiri Kosina | 2011-02-11 15:05:49 +0100 |
| commit | 0825411ade21a39ac63b3e011d092b1f95b5f3f5 (patch) | |
| tree | c69a0088e46c93ef1a0916030af3e02c4cce04e9 /net/bluetooth/hidp/core.c | |
| parent | HID: bt: Move hid_add_device() call to after hidp_session() has started. (diff) | |
| download | kernel-qcow2-linux-0825411ade21a39ac63b3e011d092b1f95b5f3f5.tar.gz kernel-qcow2-linux-0825411ade21a39ac63b3e011d092b1f95b5f3f5.tar.xz kernel-qcow2-linux-0825411ade21a39ac63b3e011d092b1f95b5f3f5.zip | |
HID: bt: 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@signal11.us>
Acked-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'net/bluetooth/hidp/core.c')
| -rw-r--r-- | net/bluetooth/hidp/core.c | 54 |
1 files changed, 51 insertions, 3 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c index 67cc4bc82c68..5383e6c7d09d 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, |