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[107.146.107.67]) by smtp.gmail.com with ESMTPSA id k21-20020ab07555000000b007e3199adc5dsm1382051uaq.0.2024.04.10.07.02.06 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Apr 2024 07:02:06 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ v3 1/4] shared/uhid: Add support for bt_uhid_replay Date: Wed, 10 Apr 2024 10:02:02 -0400 Message-ID: <20240410140205.4056047-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz This adds support for bt_uhid_replay which enablind replaying GET/SET_REPORT messages stored during the first time a device is created. --- src/shared/uhid.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++ src/shared/uhid.h | 1 + 2 files changed, 124 insertions(+) diff --git a/src/shared/uhid.c b/src/shared/uhid.c index 46edb3bfa3ba..690d58d7bd78 100644 --- a/src/shared/uhid.c +++ b/src/shared/uhid.c @@ -30,6 +30,14 @@ #define MIN(x, y) ((x) < (y) ? (x) : (y)) #endif +struct uhid_replay { + bool active; + struct queue *out; + struct queue *in; + struct queue *rout; + struct queue *rin; +}; + struct bt_uhid { int ref_count; struct io *io; @@ -38,6 +46,7 @@ struct bt_uhid { struct queue *input; bool created; bool started; + struct uhid_replay *replay; }; struct uhid_notify { @@ -47,6 +56,18 @@ struct uhid_notify { void *user_data; }; +static void uhid_replay_free(struct uhid_replay *replay) +{ + if (!replay) + return; + + queue_destroy(replay->rin, NULL); + queue_destroy(replay->in, free); + queue_destroy(replay->rout, NULL); + queue_destroy(replay->out, free); + free(replay); +} + static void uhid_free(struct bt_uhid *uhid) { if (uhid->io) @@ -58,6 +79,8 @@ static void uhid_free(struct bt_uhid *uhid) if (uhid->input) queue_destroy(uhid->input, free); + uhid_replay_free(uhid->replay); + free(uhid); } @@ -73,6 +96,42 @@ static void notify_handler(void *data, void *user_data) notify->func(ev, notify->user_data); } +static struct uhid_replay *uhid_replay_new(void) +{ + struct uhid_replay *replay = new0(struct uhid_replay, 1); + + replay->out = queue_new(); + replay->in = queue_new(); + + return replay; +} + +static int bt_uhid_record(struct bt_uhid *uhid, bool input, + struct uhid_event *ev) +{ + if (!uhid) + return -EINVAL; + + /* Capture input events in replay mode and send the next replay event */ + if (uhid->replay && uhid->replay->active && input) { + queue_pop_head(uhid->replay->rin); + bt_uhid_replay(uhid); + return -EALREADY; + } + + if (!uhid->replay) + uhid->replay = uhid_replay_new(); + + if (input) + queue_push_tail(uhid->replay->in, + util_memdup(ev, sizeof(*ev))); + else + queue_push_tail(uhid->replay->out, + util_memdup(ev, sizeof(*ev))); + + return 0; +} + static bool uhid_read_handler(struct io *io, void *user_data) { struct bt_uhid *uhid = user_data; @@ -93,6 +152,13 @@ static bool uhid_read_handler(struct io *io, void *user_data) if ((size_t) len < sizeof(ev.type)) return false; + switch (ev.type) { + case UHID_GET_REPORT: + case UHID_SET_REPORT: + bt_uhid_record(uhid, false, &ev); + break; + } + queue_foreach(uhid->notify_list, notify_handler, &ev); return true; @@ -382,6 +448,9 @@ int bt_uhid_set_report_reply(struct bt_uhid *uhid, uint8_t id, uint8_t status) rsp->id = id; rsp->err = status; + if (bt_uhid_record(uhid, true, &ev) == -EALREADY) + return 0; + return bt_uhid_send(uhid, &ev); } @@ -412,6 +481,9 @@ int bt_uhid_get_report_reply(struct bt_uhid *uhid, uint8_t id, uint8_t number, memcpy(&rsp->data[len], data, rsp->size - len); done: + if (bt_uhid_record(uhid, true, &ev) == -EALREADY) + return 0; + return bt_uhid_send(uhid, &ev); } @@ -437,3 +509,54 @@ int bt_uhid_destroy(struct bt_uhid *uhid) return err; } + +static void queue_append(void *data, void *user_data) +{ + queue_push_tail(user_data, data); +} + +static struct queue *queue_dup(struct queue *q) +{ + struct queue *dup; + + if (!q || queue_isempty(q)) + return NULL; + + dup = queue_new(); + + queue_foreach(q, queue_append, dup); + + return dup; +} + +int bt_uhid_replay(struct bt_uhid *uhid) +{ + struct uhid_event *ev; + + if (!uhid || !uhid->started) + return -EINVAL; + + if (!uhid->replay) + return 0; + + if (uhid->replay->active) + goto resend; + + uhid->replay->active = true; + queue_destroy(uhid->replay->rin, NULL); + uhid->replay->rin = queue_dup(uhid->replay->in); + + queue_destroy(uhid->replay->rout, NULL); + uhid->replay->rout = queue_dup(uhid->replay->out); + +resend: + ev = queue_pop_head(uhid->replay->rout); + if (!ev) { + uhid->replay->active = false; + return 0; + } + + queue_foreach(uhid->notify_list, notify_handler, ev); + + return 0; +} diff --git a/src/shared/uhid.h b/src/shared/uhid.h index d70533882727..4e288cb192aa 100644 --- a/src/shared/uhid.h +++ b/src/shared/uhid.h @@ -42,3 +42,4 @@ int bt_uhid_set_report_reply(struct bt_uhid *uhid, uint8_t id, uint8_t status); int bt_uhid_get_report_reply(struct bt_uhid *uhid, uint8_t id, uint8_t number, uint8_t status, const void *data, size_t size); int bt_uhid_destroy(struct bt_uhid *uhid); +int bt_uhid_replay(struct bt_uhid *uhid);