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path: root/drivers/media/test-drivers/vivid/vivid-cec.c
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Diffstat (limited to 'drivers/media/test-drivers/vivid/vivid-cec.c')
-rw-r--r--drivers/media/test-drivers/vivid/vivid-cec.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vivid/vivid-cec.c b/drivers/media/test-drivers/vivid/vivid-cec.c
new file mode 100644
index 000000000000..4d2413e87730
--- /dev/null
+++ b/drivers/media/test-drivers/vivid/vivid-cec.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vivid-cec.c - A Virtual Video Test Driver, cec emulation
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <media/cec.h>
+
+#include "vivid-core.h"
+#include "vivid-cec.h"
+
+#define CEC_TIM_START_BIT_TOTAL 4500
+#define CEC_TIM_START_BIT_LOW 3700
+#define CEC_TIM_START_BIT_HIGH 800
+#define CEC_TIM_DATA_BIT_TOTAL 2400
+#define CEC_TIM_DATA_BIT_0_LOW 1500
+#define CEC_TIM_DATA_BIT_0_HIGH 900
+#define CEC_TIM_DATA_BIT_1_LOW 600
+#define CEC_TIM_DATA_BIT_1_HIGH 1800
+
+void vivid_cec_bus_free_work(struct vivid_dev *dev)
+{
+ spin_lock(&dev->cec_slock);
+ while (!list_empty(&dev->cec_work_list)) {
+ struct vivid_cec_work *cw =
+ list_first_entry(&dev->cec_work_list,
+ struct vivid_cec_work, list);
+
+ spin_unlock(&dev->cec_slock);
+ cancel_delayed_work_sync(&cw->work);
+ spin_lock(&dev->cec_slock);
+ list_del(&cw->list);
+ cec_transmit_attempt_done(cw->adap, CEC_TX_STATUS_LOW_DRIVE);
+ kfree(cw);
+ }
+ spin_unlock(&dev->cec_slock);
+}
+
+static bool vivid_cec_find_dest_adap(struct vivid_dev *dev,
+ struct cec_adapter *adap, u8 dest)
+{
+ unsigned int i;
+
+ if (dest >= 0xf)
+ return false;
+
+ if (adap != dev->cec_rx_adap && dev->cec_rx_adap &&
+ dev->cec_rx_adap->is_configured &&
+ cec_has_log_addr(dev->cec_rx_adap, dest))
+ return true;
+
+ for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++) {
+ if (adap == dev->cec_tx_adap[i])
+ continue;
+ if (!dev->cec_tx_adap[i]->is_configured)
+ continue;
+ if (cec_has_log_addr(dev->cec_tx_adap[i], dest))
+ return true;
+ }
+ return false;
+}
+
+static void vivid_cec_pin_adap_events(struct cec_adapter *adap, ktime_t ts,
+ const struct cec_msg *msg, bool nacked)
+{
+ unsigned int len = nacked ? 1 : msg->len;
+ unsigned int i;
+ bool bit;
+
+ if (adap == NULL)
+ return;
+
+ /*
+ * Suffix ULL on constant 10 makes the expression
+ * CEC_TIM_START_BIT_TOTAL + 10ULL * len * CEC_TIM_DATA_BIT_TOTAL
+ * to be evaluated using 64-bit unsigned arithmetic (u64), which
+ * is what ktime_sub_us expects as second argument.
+ */
+ ts = ktime_sub_us(ts, CEC_TIM_START_BIT_TOTAL +
+ 10ULL * len * CEC_TIM_DATA_BIT_TOTAL);
+ cec_queue_pin_cec_event(adap, false, false, ts);
+ ts = ktime_add_us(ts, CEC_TIM_START_BIT_LOW);
+ cec_queue_pin_cec_event(adap, true, false, ts);
+ ts = ktime_add_us(ts, CEC_TIM_START_BIT_HIGH);
+
+ for (i = 0; i < 10 * len; i++) {
+ switch (i % 10) {
+ case 0 ... 7:
+ bit = msg->msg[i / 10] & (0x80 >> (i % 10));
+ break;
+ case 8: /* EOM */
+ bit = i / 10 == msg->len - 1;
+ break;
+ case 9: /* ACK */
+ bit = cec_msg_is_broadcast(msg) ^ nacked;
+ break;
+ }
+ cec_queue_pin_cec_event(adap, false, false, ts);
+ if (bit)
+ ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_1_LOW);
+ else
+ ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_0_LOW);
+ cec_queue_pin_cec_event(adap, true, false, ts);
+ if (bit)
+ ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_1_HIGH);
+ else
+ ts = ktime_add_us(ts, CEC_TIM_DATA_BIT_0_HIGH);
+ }
+}
+
+static void vivid_cec_pin_events(struct vivid_dev *dev,
+ const struct cec_msg *msg, bool nacked)
+{
+ ktime_t ts = ktime_get();
+ unsigned int i;
+
+ vivid_cec_pin_adap_events(dev->cec_rx_adap, ts, msg, nacked);
+ for (i = 0; i < MAX_OUTPUTS; i++)
+ vivid_cec_pin_adap_events(dev->cec_tx_adap[i], ts, msg, nacked);
+}
+
+static void vivid_cec_xfer_done_worker(struct work_struct *work)
+{
+ struct vivid_cec_work *cw =
+ container_of(work, struct vivid_cec_work, work.work);
+ struct vivid_dev *dev = cw->dev;
+ struct cec_adapter *adap = cw->adap;
+ u8 dest = cec_msg_destination(&cw->msg);
+ bool valid_dest;
+ unsigned int i;
+
+ valid_dest = cec_msg_is_broadcast(&cw->msg);
+ if (!valid_dest)
+ valid_dest = vivid_cec_find_dest_adap(dev, adap, dest);
+
+ cw->tx_status = valid_dest ? CEC_TX_STATUS_OK : CEC_TX_STATUS_NACK;
+ spin_lock(&dev->cec_slock);
+ dev->cec_xfer_time_jiffies = 0;
+ dev->cec_xfer_start_jiffies = 0;
+ list_del(&cw->list);
+ spin_unlock(&dev->cec_slock);
+ vivid_cec_pin_events(dev, &cw->msg, !valid_dest);
+ cec_transmit_attempt_done(cw->adap, cw->tx_status);
+
+ /* Broadcast message */
+ if (adap != dev->cec_rx_adap)
+ cec_received_msg(dev->cec_rx_adap, &cw->msg);
+ for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++)
+ if (adap != dev->cec_tx_adap[i])
+ cec_received_msg(dev->cec_tx_adap[i], &cw->msg);
+ kfree(cw);
+}
+
+static void vivid_cec_xfer_try_worker(struct work_struct *work)
+{
+ struct vivid_cec_work *cw =
+ container_of(work, struct vivid_cec_work, work.work);
+ struct vivid_dev *dev = cw->dev;
+
+ spin_lock(&dev->cec_slock);
+ if (dev->cec_xfer_time_jiffies) {
+ list_del(&cw->list);
+ spin_unlock(&dev->cec_slock);
+ cec_transmit_attempt_done(cw->adap, CEC_TX_STATUS_ARB_LOST);
+ kfree(cw);
+ } else {
+ INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker);
+ dev->cec_xfer_start_jiffies = jiffies;
+ dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs);
+ spin_unlock(&dev->cec_slock);
+ schedule_delayed_work(&cw->work, dev->cec_xfer_time_jiffies);
+ }
+}
+
+static int vivid_cec_adap_enable(struct cec_adapter *adap, bool enable)
+{
+ adap->cec_pin_is_high = true;
+ return 0;
+}
+
+static int vivid_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
+{
+ return 0;
+}
+
+/*
+ * One data bit takes 2400 us, each byte needs 10 bits so that's 24000 us
+ * per byte.
+ */
+#define USECS_PER_BYTE 24000
+
+static int vivid_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
+ u32 signal_free_time, struct cec_msg *msg)
+{
+ struct vivid_dev *dev = cec_get_drvdata(adap);
+ struct vivid_cec_work *cw = kzalloc(sizeof(*cw), GFP_KERNEL);
+ long delta_jiffies = 0;
+
+ if (cw == NULL)
+ return -ENOMEM;
+ cw->dev = dev;
+ cw->adap = adap;
+ cw->usecs = CEC_FREE_TIME_TO_USEC(signal_free_time) +
+ msg->len * USECS_PER_BYTE;
+ cw->msg = *msg;
+
+ spin_lock(&dev->cec_slock);
+ list_add(&cw->list, &dev->cec_work_list);
+ if (dev->cec_xfer_time_jiffies == 0) {
+ INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker);
+ dev->cec_xfer_start_jiffies = jiffies;
+ dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs);
+ delta_jiffies = dev->cec_xfer_time_jiffies;
+ } else {
+ INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_try_worker);
+ delta_jiffies = dev->cec_xfer_start_jiffies +
+ dev->cec_xfer_time_jiffies - jiffies;
+ }
+ spin_unlock(&dev->cec_slock);
+ schedule_delayed_work(&cw->work, delta_jiffies < 0 ? 0 : delta_jiffies);
+ return 0;
+}
+
+static int vivid_received(struct cec_adapter *adap, struct cec_msg *msg)
+{
+ struct vivid_dev *dev = cec_get_drvdata(adap);
+ struct cec_msg reply;
+ u8 dest = cec_msg_destination(msg);
+ u8 disp_ctl;
+ char osd[14];
+
+ if (cec_msg_is_broadcast(msg))
+ dest = adap->log_addrs.log_addr[0];
+ cec_msg_init(&reply, dest, cec_msg_initiator(msg));
+
+ switch (cec_msg_opcode(msg)) {
+ case CEC_MSG_SET_OSD_STRING:
+ if (!cec_is_sink(adap))
+ return -ENOMSG;
+ cec_ops_set_osd_string(msg, &disp_ctl, osd);
+ switch (disp_ctl) {
+ case CEC_OP_DISP_CTL_DEFAULT:
+ strscpy(dev->osd, osd, sizeof(dev->osd));
+ dev->osd_jiffies = jiffies;
+ break;
+ case CEC_OP_DISP_CTL_UNTIL_CLEARED:
+ strscpy(dev->osd, osd, sizeof(dev->osd));
+ dev->osd_jiffies = 0;
+ break;
+ case CEC_OP_DISP_CTL_CLEAR:
+ dev->osd[0] = 0;
+ dev->osd_jiffies = 0;
+ break;
+ default:
+ cec_msg_feature_abort(&reply, cec_msg_opcode(msg),
+ CEC_OP_ABORT_INVALID_OP);
+ cec_transmit_msg(adap, &reply, false);
+ break;
+ }
+ break;
+ default:
+ return -ENOMSG;
+ }
+ return 0;
+}
+
+static const struct cec_adap_ops vivid_cec_adap_ops = {
+ .adap_enable = vivid_cec_adap_enable,
+ .adap_log_addr = vivid_cec_adap_log_addr,
+ .adap_transmit = vivid_cec_adap_transmit,
+ .received = vivid_received,
+};
+
+struct cec_adapter *vivid_cec_alloc_adap(struct vivid_dev *dev,
+ unsigned int idx,
+ bool is_source)
+{
+ u32 caps = CEC_CAP_DEFAULTS | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN;
+ char name[32];
+
+ snprintf(name, sizeof(name), "vivid-%03d-vid-%s%d",
+ dev->inst, is_source ? "out" : "cap", idx);
+ return cec_allocate_adapter(&vivid_cec_adap_ops, dev,
+ name, caps, 1);
+}