232 lines
6.5 KiB
C
232 lines
6.5 KiB
C
/*
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* vivid-cec.c - A Virtual Video Test Driver, cec emulation
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*
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* Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <media/cec.h>
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#include "vivid-core.h"
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#include "vivid-cec.h"
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void vivid_cec_bus_free_work(struct vivid_dev *dev)
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{
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spin_lock(&dev->cec_slock);
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while (!list_empty(&dev->cec_work_list)) {
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struct vivid_cec_work *cw =
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list_first_entry(&dev->cec_work_list,
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struct vivid_cec_work, list);
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spin_unlock(&dev->cec_slock);
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cancel_delayed_work_sync(&cw->work);
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spin_lock(&dev->cec_slock);
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list_del(&cw->list);
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cec_transmit_done(cw->adap, CEC_TX_STATUS_LOW_DRIVE, 0, 0, 1, 0);
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kfree(cw);
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}
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spin_unlock(&dev->cec_slock);
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}
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static bool vivid_cec_find_dest_adap(struct vivid_dev *dev,
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struct cec_adapter *adap, u8 dest)
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{
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unsigned int i;
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if (dest >= 0xf)
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return false;
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if (adap != dev->cec_rx_adap && dev->cec_rx_adap &&
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dev->cec_rx_adap->is_configured &&
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cec_has_log_addr(dev->cec_rx_adap, dest))
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return true;
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for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++) {
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if (adap == dev->cec_tx_adap[i])
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continue;
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if (!dev->cec_tx_adap[i]->is_configured)
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continue;
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if (cec_has_log_addr(dev->cec_tx_adap[i], dest))
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return true;
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}
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return false;
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}
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static void vivid_cec_xfer_done_worker(struct work_struct *work)
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{
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struct vivid_cec_work *cw =
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container_of(work, struct vivid_cec_work, work.work);
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struct vivid_dev *dev = cw->dev;
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struct cec_adapter *adap = cw->adap;
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u8 dest = cec_msg_destination(&cw->msg);
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bool valid_dest;
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unsigned int i;
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valid_dest = cec_msg_is_broadcast(&cw->msg);
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if (!valid_dest)
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valid_dest = vivid_cec_find_dest_adap(dev, adap, dest);
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cw->tx_status = valid_dest ? CEC_TX_STATUS_OK : CEC_TX_STATUS_NACK;
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spin_lock(&dev->cec_slock);
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dev->cec_xfer_time_jiffies = 0;
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dev->cec_xfer_start_jiffies = 0;
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list_del(&cw->list);
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spin_unlock(&dev->cec_slock);
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cec_transmit_done(cw->adap, cw->tx_status, 0, valid_dest ? 0 : 1, 0, 0);
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/* Broadcast message */
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if (adap != dev->cec_rx_adap)
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cec_received_msg(dev->cec_rx_adap, &cw->msg);
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for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++)
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if (adap != dev->cec_tx_adap[i])
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cec_received_msg(dev->cec_tx_adap[i], &cw->msg);
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kfree(cw);
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}
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static void vivid_cec_xfer_try_worker(struct work_struct *work)
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{
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struct vivid_cec_work *cw =
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container_of(work, struct vivid_cec_work, work.work);
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struct vivid_dev *dev = cw->dev;
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spin_lock(&dev->cec_slock);
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if (dev->cec_xfer_time_jiffies) {
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list_del(&cw->list);
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spin_unlock(&dev->cec_slock);
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cec_transmit_done(cw->adap, CEC_TX_STATUS_ARB_LOST, 1, 0, 0, 0);
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kfree(cw);
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} else {
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INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker);
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dev->cec_xfer_start_jiffies = jiffies;
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dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs);
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spin_unlock(&dev->cec_slock);
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schedule_delayed_work(&cw->work, dev->cec_xfer_time_jiffies);
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}
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}
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static int vivid_cec_adap_enable(struct cec_adapter *adap, bool enable)
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{
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return 0;
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}
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static int vivid_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
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{
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return 0;
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}
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/*
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* One data bit takes 2400 us, each byte needs 10 bits so that's 24000 us
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* per byte.
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*/
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#define USECS_PER_BYTE 24000
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static int vivid_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
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u32 signal_free_time, struct cec_msg *msg)
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{
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struct vivid_dev *dev = adap->priv;
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struct vivid_cec_work *cw = kzalloc(sizeof(*cw), GFP_KERNEL);
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long delta_jiffies = 0;
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if (cw == NULL)
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return -ENOMEM;
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cw->dev = dev;
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cw->adap = adap;
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cw->usecs = CEC_FREE_TIME_TO_USEC(signal_free_time) +
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msg->len * USECS_PER_BYTE;
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cw->msg = *msg;
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spin_lock(&dev->cec_slock);
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list_add(&cw->list, &dev->cec_work_list);
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if (dev->cec_xfer_time_jiffies == 0) {
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INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker);
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dev->cec_xfer_start_jiffies = jiffies;
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dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs);
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delta_jiffies = dev->cec_xfer_time_jiffies;
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} else {
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INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_try_worker);
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delta_jiffies = dev->cec_xfer_start_jiffies +
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dev->cec_xfer_time_jiffies - jiffies;
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}
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spin_unlock(&dev->cec_slock);
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schedule_delayed_work(&cw->work, delta_jiffies < 0 ? 0 : delta_jiffies);
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return 0;
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}
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static int vivid_received(struct cec_adapter *adap, struct cec_msg *msg)
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{
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struct vivid_dev *dev = adap->priv;
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struct cec_msg reply;
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u8 dest = cec_msg_destination(msg);
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u8 disp_ctl;
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char osd[14];
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if (cec_msg_is_broadcast(msg))
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dest = adap->log_addrs.log_addr[0];
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cec_msg_init(&reply, dest, cec_msg_initiator(msg));
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switch (cec_msg_opcode(msg)) {
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case CEC_MSG_SET_OSD_STRING:
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if (!cec_is_sink(adap))
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return -ENOMSG;
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cec_ops_set_osd_string(msg, &disp_ctl, osd);
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switch (disp_ctl) {
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case CEC_OP_DISP_CTL_DEFAULT:
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strcpy(dev->osd, osd);
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dev->osd_jiffies = jiffies;
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break;
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case CEC_OP_DISP_CTL_UNTIL_CLEARED:
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strcpy(dev->osd, osd);
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dev->osd_jiffies = 0;
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break;
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case CEC_OP_DISP_CTL_CLEAR:
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dev->osd[0] = 0;
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dev->osd_jiffies = 0;
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break;
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default:
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cec_msg_feature_abort(&reply, cec_msg_opcode(msg),
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CEC_OP_ABORT_INVALID_OP);
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cec_transmit_msg(adap, &reply, false);
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break;
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}
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break;
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default:
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return -ENOMSG;
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}
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return 0;
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}
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static const struct cec_adap_ops vivid_cec_adap_ops = {
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.adap_enable = vivid_cec_adap_enable,
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.adap_log_addr = vivid_cec_adap_log_addr,
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.adap_transmit = vivid_cec_adap_transmit,
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.received = vivid_received,
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};
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struct cec_adapter *vivid_cec_alloc_adap(struct vivid_dev *dev,
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unsigned int idx,
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struct device *parent,
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bool is_source)
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{
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char name[sizeof(dev->vid_out_dev.name) + 2];
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u32 caps = CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS |
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CEC_CAP_PASSTHROUGH | CEC_CAP_RC | CEC_CAP_MONITOR_ALL;
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snprintf(name, sizeof(name), "%s%d",
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is_source ? dev->vid_out_dev.name : dev->vid_cap_dev.name,
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idx);
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return cec_allocate_adapter(&vivid_cec_adap_ops, dev,
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name, caps, 1, parent);
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}
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