Return-Path: From: Alan Ott To: Jiri Kosina , Stefan Achatz , Antonio Ospite , Alexey Dobriyan , Tejun Heo , Alan Stern , Greg Kroah-Hartman , Alan Ott , Marcel Holtmann , Stephane Chatty , Michael Poole , "David S. Miller" , Bastien Nocera , Eric Dumazet , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org Cc: Alan Ott Subject: [PATCH v4 2/2] Bluetooth: hidp: Add support for hidraw HIDIOCGFEATURE and HIDIOCSFEATURE Date: Mon, 16 Aug 2010 16:20:59 -0400 Message-Id: <1281990059-3562-3-git-send-email-alan@signal11.us> In-Reply-To: <1281442367.12579.206.camel@localhost.localdomain> References: <1281442367.12579.206.camel@localhost.localdomain> List-ID: This patch adds support or getting and setting feature reports for bluetooth HID devices from HIDRAW. Signed-off-by: Alan Ott --- net/bluetooth/hidp/core.c | 114 +++++++++++++++++++++++++++++++++++++++++++-- net/bluetooth/hidp/hidp.h | 8 +++ 2 files changed, 118 insertions(+), 4 deletions(-) diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c index bfe641b..0e4880e 100644 --- a/net/bluetooth/hidp/core.c +++ b/net/bluetooth/hidp/core.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include @@ -313,6 +314,86 @@ static int hidp_send_report(struct hidp_session *session, struct hid_report *rep return hidp_queue_report(session, buf, rsize); } +static int hidp_get_raw_report(struct hid_device *hid, + unsigned char report_number, + unsigned char *data, size_t count, + unsigned char report_type) +{ + struct hidp_session *session = hid->driver_data; + struct sk_buff *skb; + size_t len; + int numbered_reports = hid->report_enum[report_type].numbered; + + switch (report_type) { + case HID_FEATURE_REPORT: + report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE; + break; + case HID_INPUT_REPORT: + report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT; + break; + case HID_OUTPUT_REPORT: + report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT; + break; + default: + return -EINVAL; + } + + if (mutex_lock_interruptible(&session->report_mutex)) + return -ERESTARTSYS; + + /* Set up our wait, and send the report request to the device. */ + session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK; + session->waiting_report_number = numbered_reports ? report_number : -1; + set_bit(HIDP_WAITING_FOR_RETURN, &session->flags); + data[0] = report_number; + if (hidp_send_ctrl_message(hid->driver_data, report_type, data, 1)) + goto err_eio; + + /* Wait for the return of the report. The returned report + gets put in session->report_return. */ + while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) { + int res; + + res = wait_event_interruptible_timeout(session->report_queue, + !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags), + 5*HZ); + if (res == 0) { + /* timeout */ + goto err_eio; + } + if (res < 0) { + /* signal */ + goto err_restartsys; + } + } + + skb = session->report_return; + if (skb) { + len = skb->len < count ? skb->len : count; + memcpy(data, skb->data, len); + + kfree_skb(skb); + session->report_return = NULL; + } else { + /* Device returned a HANDSHAKE, indicating protocol error. */ + len = -EIO; + } + + clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); + mutex_unlock(&session->report_mutex); + + return len; + +err_restartsys: + clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); + mutex_unlock(&session->report_mutex); + return -ERESTARTSYS; +err_eio: + clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); + mutex_unlock(&session->report_mutex); + return -EIO; +} + static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count, unsigned char report_type) { @@ -367,6 +448,10 @@ static void hidp_process_handshake(struct hidp_session *session, case HIDP_HSHK_ERR_INVALID_REPORT_ID: case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: case HIDP_HSHK_ERR_INVALID_PARAMETER: + if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) { + clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); + wake_up_interruptible(&session->report_queue); + } /* FIXME: Call into SET_ GET_ handlers here */ break; @@ -403,9 +488,11 @@ static void hidp_process_hid_control(struct hidp_session *session, } } -static void hidp_process_data(struct hidp_session *session, struct sk_buff *skb, +/* Returns true if the passed-in skb should be freed by the caller. */ +static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, unsigned char param) { + int done_with_skb = 1; BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); switch (param) { @@ -417,7 +504,6 @@ static void hidp_process_data(struct hidp_session *session, struct sk_buff *skb, if (session->hid) hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0); - break; case HIDP_DATA_RTYPE_OTHER: @@ -429,12 +515,27 @@ static void hidp_process_data(struct hidp_session *session, struct sk_buff *skb, __hidp_send_ctrl_message(session, HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); } + + if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && + param == session->waiting_report_type) { + if (session->waiting_report_number < 0 || + session->waiting_report_number == skb->data[0]) { + /* hidp_get_raw_report() is waiting on this report. */ + session->report_return = skb; + done_with_skb = 0; + clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); + wake_up_interruptible(&session->report_queue); + } + } + + return done_with_skb; } static void hidp_recv_ctrl_frame(struct hidp_session *session, struct sk_buff *skb) { unsigned char hdr, type, param; + int free_skb = 1; BT_DBG("session %p skb %p len %d", session, skb, skb->len); @@ -454,7 +555,7 @@ static void hidp_recv_ctrl_frame(struct hidp_session *session, break; case HIDP_TRANS_DATA: - hidp_process_data(session, skb, param); + free_skb = hidp_process_data(session, skb, param); break; default: @@ -463,7 +564,8 @@ static void hidp_recv_ctrl_frame(struct hidp_session *session, break; } - kfree_skb(skb); + if (free_skb) + kfree_skb(skb); } static void hidp_recv_intr_frame(struct hidp_session *session, @@ -797,6 +899,7 @@ static int hidp_setup_hid(struct hidp_session *session, hid->dev.parent = hidp_get_device(session); hid->ll_driver = &hidp_hid_driver; + hid->hid_get_raw_report = hidp_get_raw_report; hid->hid_output_raw_report = hidp_output_raw_report; err = hid_add_device(hid); @@ -857,6 +960,9 @@ int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock, skb_queue_head_init(&session->ctrl_transmit); skb_queue_head_init(&session->intr_transmit); + mutex_init(&session->report_mutex); + init_waitqueue_head(&session->report_queue); + session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID); session->idle_to = req->idle_to; diff --git a/net/bluetooth/hidp/hidp.h b/net/bluetooth/hidp/hidp.h index 8d934a1..00e71dd 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_RETURN 10 struct hidp_connadd_req { int ctrl_sock; // Connected control socket @@ -154,6 +155,13 @@ struct hidp_session { struct sk_buff_head ctrl_transmit; struct sk_buff_head intr_transmit; + /* Used in hidp_get_raw_report() */ + int waiting_report_type; /* HIDP_DATA_RTYPE_* */ + int waiting_report_number; /* -1 for not numbered */ + struct mutex report_mutex; + struct sk_buff *report_return; + wait_queue_head_t report_queue; + /* Report descriptor */ __u8 *rd_data; uint rd_size; -- 1.7.0.4