// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <media/cec.h>
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#include "vivid-core.h"
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#include "vivid-cec.h"
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#define CEC_TIM_START_BIT_TOTAL 4500
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#define CEC_TIM_START_BIT_LOW 3700
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#define CEC_TIM_START_BIT_HIGH 800
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#define CEC_TIM_DATA_BIT_TOTAL 2400
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#define CEC_TIM_DATA_BIT_0_LOW 1500
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#define CEC_TIM_DATA_BIT_0_HIGH 900
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#define CEC_TIM_DATA_BIT_1_LOW 600
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#define CEC_TIM_DATA_BIT_1_HIGH 1800
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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_attempt_done(cw->adap, CEC_TX_STATUS_LOW_DRIVE);
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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_pin_adap_events(struct cec_adapter *adap, ktime_t ts,
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const struct cec_msg *msg, bool nacked)
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{
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unsigned int len = nacked ? 1 : msg->len;
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unsigned int i;
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bool bit;
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if (adap == NULL)
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return;
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/*
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* Suffix ULL on constant 10 makes the expression
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* CEC_TIM_START_BIT_TOTAL + 10ULL * len * CEC_TIM_DATA_BIT_TOTAL
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* to be evaluated using 64-bit unsigned arithmetic (u64), which
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* is what ktime_sub_us expects as second argument.
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*/
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ts = ktime_sub_us(ts, CEC_TIM_START_BIT_TOTAL +
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10ULL * len * CEC_TIM_DATA_BIT_TOTAL);
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cec_queue_pin_cec_event(adap, false, false, ts);
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ts = ktime_add_us(ts, CEC_TIM_START_BIT_LOW);
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cec_queue_pin_cec_event(adap, true, false, ts);
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ts = ktime_add_us(ts, CEC_TIM_START_BIT_HIGH);
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for (i = 0; i < 10 * len; i++) {
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switch (i % 10) {
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case 0 ... 7:
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bit = msg->msg[i / 10] & (0x80 >> (i % 10));
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break;
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case 8: /* EOM */
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bit = i / 10 == msg->len - 1;
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break;
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case 9: /* ACK */
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bit = cec_msg_is_broadcast(msg) ^ nacked;
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break;
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}
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cec_queue_pin_cec_event(adap, false, false, ts);
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if (bit)
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ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_1_LOW);
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else
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ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_0_LOW);
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cec_queue_pin_cec_event(adap, true, false, ts);
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if (bit)
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ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_1_HIGH);
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else
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ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_0_HIGH);
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}
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}
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static void vivid_cec_pin_events(struct vivid_dev *dev,
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const struct cec_msg *msg, bool nacked)
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{
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ktime_t ts = ktime_get();
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unsigned int i;
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vivid_cec_pin_adap_events(dev->cec_rx_adap, ts, msg, nacked);
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for (i = 0; i < MAX_OUTPUTS; i++)
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vivid_cec_pin_adap_events(dev->cec_tx_adap[i], ts, msg, nacked);
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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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vivid_cec_pin_events(dev, &cw->msg, !valid_dest);
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cec_transmit_attempt_done(cw->adap, cw->tx_status);
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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_attempt_done(cw->adap, CEC_TX_STATUS_ARB_LOST);
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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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adap->cec_pin_is_high = true;
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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 = cec_get_drvdata(adap);
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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 = cec_get_drvdata(adap);
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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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strscpy(dev->osd, osd, sizeof(dev->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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strscpy(dev->osd, osd, sizeof(dev->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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bool is_source)
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{
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u32 caps = CEC_CAP_DEFAULTS | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN;
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char name[32];
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snprintf(name, sizeof(name), "vivid-%03d-vid-%s%d",
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dev->inst, is_source ? "out" : "cap", idx);
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return cec_allocate_adapter(&vivid_cec_adap_ops, dev,
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name, caps, 1);
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}
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