Hi Mauro,
This patch is the diff between the cec-topic branch and the upcoming v19 patch
series,
but without the split up of cec.c since that's not a functional change (and
that would
make this diff impossible to review).
Besides fixing your comments about cec.c and cec-edid.c, it also makes some
documentation
improvements and a few additional fixes:
- new messages were queued at the beginning of the message queue instead of at
the end.
I hadn't noticed before because normally there is at most only one message
queued up.
- adap->timeout wasn't zeroed in cec_transmit_done if the transmit failed or
the adapter
is no longer configured. This caused the result of such a transmit to be
unnecessarily
delayed by 'timeout' ms.
- adap->rc->driver_name wasn't set, which caused a (null) driver name when
running ir-keymap.
I also double-checked with the USB CEC dongle that unplugging the usb device
while /dev/cec0
was still open works correctly and that the cec_adapter struct is freed only
when the last
open file handle is closed.
Regards,
Hans
diff --git a/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml
b/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml
index 87d4f29..697dde5 100644
--- a/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml
+++ b/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml
@@ -61,7 +61,7 @@
<para>The internal event queues are per-filehandle and per-event type. If
there is
no more room in a queue then the last event is overwritten with the new
one. This
means that intermediate results can be thrown away but that the latest
event is always
- available. This also mean that is it possible to read two successive
events that have
+ available. This also means that is it possible to read two successive
events that have
the same value (e.g. two CEC_EVENT_STATE_CHANGE events with the same
state). In that
case the intermediate state changes were lost but it is guaranteed that
the state
did change in between the two events.</para>
@@ -95,7 +95,14 @@
<entry><structfield>lost_msgs</structfield></entry>
<entry>Set to the number of lost messages since the filehandle
was opened or since the last time this event was dequeued for
- this filehandle.</entry>
+ this filehandle. The messages lost are the oldest messages. So
+ when a new message arrives and there is no more room, then the
+ oldest message is discarded to make room for the new one. The
+ internal size of the message queue guarantees that all messages
+ received in the last two seconds will be stored. Since messages
+ should be replied to within a second according to the CEC
+ specification, this is more than enough.
+ </entry>
</row>
</tbody>
</tgroup>
diff --git a/Documentation/DocBook/media/v4l/cec-ioc-receive.xml
b/Documentation/DocBook/media/v4l/cec-ioc-receive.xml
index 4da7239..fde9f86 100644
--- a/Documentation/DocBook/media/v4l/cec-ioc-receive.xml
+++ b/Documentation/DocBook/media/v4l/cec-ioc-receive.xml
@@ -96,9 +96,12 @@
<row>
<entry>__u32</entry>
<entry><structfield>timeout</structfield></entry>
- <entry>The timeout in milliseconds. This is the time we wait for a
message to
- be received. If it is set to 0, then we wait indefinitely.
- It is ignored by <constant>CEC_TRANSMIT</constant>.</entry>
+ <entry>The timeout in milliseconds. This is the time the device
will wait for a message to
+ be received before timing out. If it is set to 0, then it will wait
indefinitely when it
+ is called by <constant>CEC_RECEIVE</constant>. If it is 0 and it is
called by
+ <constant>CEC_TRANSMIT</constant>, then it will be replaced by 1000
if the
+ <structfield>reply</structfield> is non-zero or ignored if
<structfield>reply</structfield>
+ is 0.</entry>
</row>
<row>
<entry>__u32</entry>
@@ -143,10 +146,16 @@
<entry>__u8</entry>
<entry><structfield>reply</structfield></entry>
<entry>Wait until this message is replied. If
<structfield>reply</structfield>
- is 0, then don't wait for a reply but return after transmitting the
- message. If there was an error as indicated by a non-zero
<structfield>status</structfield>
- field, then <structfield>reply</structfield> is set to 0 by the
driver.
- Ignored by <constant>CEC_RECEIVE</constant>.</entry>
+ is 0 and the <structfield>timeout</structfield> is 0, then don't
wait for a reply but
+ return after transmitting the message. If there was an error as
indicated by a non-zero
+ <structfield>tx_status</structfield> field, then
<structfield>reply</structfield> and
+ <structfield>timeout</structfield> are both set to 0 by the driver.
Ignored by
+ <constant>CEC_RECEIVE</constant>. The case where
<structfield>reply</structfield> is 0
+ (this is the opcode for the Feature Abort message) and
<structfield>timeout</structfield>
+ is non-zero is specifically allowed to send a message and wait up
to <structfield>timeout</structfield>
+ milliseconds for a Feature Abort reply. In this case
<structfield>rx_status</structfield>
+ will either be set to <constant>CEC_RX_STATUS_TIMEOUT</constant> or
+ <constant>CEC_RX_STATUS_FEATURE_ABORT</constant>.</entry>
</row>
<row>
<entry>__u8</entry>
diff --git a/drivers/media/cec-edid.c b/drivers/media/cec-edid.c
index ce3b915..7001824 100644
--- a/drivers/media/cec-edid.c
+++ b/drivers/media/cec-edid.c
@@ -22,30 +22,59 @@
#include <linux/types.h>
#include <media/cec-edid.h>
+/*
+ * This EDID is expected to be a CEA-861 compliant, which means that there are
+ * at least two blocks and one or more of the extensions blocks are CEA-861
+ * blocks.
+ *
+ * The returned location is guaranteed to be < size - 1.
+ */
static unsigned int cec_get_edid_spa_location(const u8 *edid, unsigned int
size)
{
+ unsigned int blocks = size / 128;
+ unsigned int block;
u8 d;
- if (size < 256)
- return 0;
-
- if (edid[0x7e] != 1 || edid[0x80] != 0x02 || edid[0x81] != 0x03)
+ /* Sanity check: at least 2 blocks and a multiple of the block size */
+ if (blocks < 2 || size % 128)
return 0;
- /* search Vendor Specific Data Block (tag 3) */
- d = edid[0x82] & 0x7f;
- if (d > 4) {
- int i = 0x84;
- int end = 0x80 + d;
-
- do {
- u8 tag = edid[i] >> 5;
- u8 len = edid[i] & 0x1f;
-
- if (tag == 3 && len >= 5)
- return i + 4;
- i += len + 1;
- } while (i < end);
+ /*
+ * If there are fewer extension blocks than the size, then update
+ * 'blocks'. It is allowed to have more extension blocks than the size,
+ * since some hardware can only read e.g. 256 bytes of the EDID, even
+ * though more blocks are present. The first CEA-861 extension block
+ * should normally be in block 1 anyway.
+ */
+ if (edid[0x7e] + 1 < blocks)
+ blocks = edid[0x7e] + 1;
+
+ for (block = 1; block < blocks; block++) {
+ unsigned int offset = block * 128;
+
+ /* Skip any non-CEA-861 extension blocks */
+ if (edid[offset] != 0x02 || edid[offset + 1] != 0x03)
+ continue;
+
+ /* search Vendor Specific Data Block (tag 3) */
+ d = edid[offset + 2] & 0x7f;
+ /* Check if there are Data Blocks */
+ if (d <= 4)
+ continue;
+ if (d > 4) {
+ unsigned int i = offset + 4;
+ unsigned int end = offset + d;
+
+ /* Note: 'end' is always < 'size' */
+ do {
+ u8 tag = edid[i] >> 5;
+ u8 len = edid[i] & 0x1f;
+
+ if (tag == 3 && len >= 5 && i + len <= end)
+ return i + 4;
+ i += len + 1;
+ } while (i < end);
+ }
}
return 0;
}
diff --git a/drivers/staging/media/cec/Kconfig
b/drivers/staging/media/cec/Kconfig
index 3297a54..8a7acee 100644
--- a/drivers/staging/media/cec/Kconfig
+++ b/drivers/staging/media/cec/Kconfig
@@ -6,3 +6,9 @@ config MEDIA_CEC
To compile this driver as a module, choose M here: the
module will be called cec.
+
+config MEDIA_CEC_DEBUG
+ bool "CEC debugfs interface (EXPERIMENTAL)"
+ depends on MEDIA_CEC && DEBUG_FS
+ ---help---
+ Turns on the DebugFS interface for CEC devices.
diff --git a/drivers/staging/media/cec/TODO b/drivers/staging/media/cec/TODO
index e3c384a..a8f4b7d 100644
--- a/drivers/staging/media/cec/TODO
+++ b/drivers/staging/media/cec/TODO
@@ -19,5 +19,9 @@ Other TODOs:
is only sent to the filehandle that transmitted the original message
and not to any followers. Should this behavior change or perhaps
controlled through a cec_msg flag?
+- Should CEC_LOG_ADDR_TYPE_SPECIFIC be replaced by TYPE_2ND_TV and
TYPE_PROCESSOR?
+ And also TYPE_SWITCH and TYPE_CDC_ONLY in addition to the TYPE_UNREGISTERED?
+ This should give the framework more information about the device type
+ since SPECIFIC and UNREGISTERED give no useful information.
Hans Verkuil <[email protected]>
diff --git a/drivers/staging/media/cec/cec.c b/drivers/staging/media/cec/cec.c
index 8634773..4eb087e 100644
--- a/drivers/staging/media/cec/cec.c
+++ b/drivers/staging/media/cec/cec.c
@@ -104,64 +104,48 @@ static unsigned int cec_log_addr2dev(const struct
cec_adapter *adap, u8 log_addr
return adap->log_addrs.primary_device_type[i < 0 ? 0 : i];
}
-/* Initialize the event queues for the filehandle. */
-static int cec_queue_event_init(struct cec_fh *fh)
-{
- /* This has the size of the event queue for each event type. */
- static const unsigned int queue_sizes[CEC_NUM_EVENTS] = {
- 2, /* CEC_EVENT_STATE_CHANGE */
- 1, /* CEC_EVENT_LOST_MSGS */
- };
- unsigned int i;
-
- for (i = 0; i < CEC_NUM_EVENTS; i++) {
- fh->evqueue[i].events = kcalloc(queue_sizes[i],
- sizeof(struct cec_event), GFP_KERNEL);
- if (!fh->evqueue[i].events) {
- while (i--) {
- kfree(fh->evqueue[i].events);
- fh->evqueue[i].events = NULL;
- fh->evqueue[i].elems = 0;
- }
- return -ENOMEM;
- }
- fh->evqueue[i].elems = queue_sizes[i];
- }
- return 0;
-}
-
-static void cec_queue_event_free(struct cec_fh *fh)
-{
- unsigned int i;
-
- for (i = 0; i < CEC_NUM_EVENTS; i++)
- kfree(fh->evqueue[i].events);
-}
-
/*
* Queue a new event for this filehandle. If ts == 0, then set it
* to the current time.
+ *
+ * The two events that are currently defined do not need to keep track
+ * of intermediate events, so no actual queue of events is needed,
+ * instead just store the latest state and the total number of lost
+ * messages.
+ *
+ * Should new events be added in the future that require intermediate
+ * results to be queued as well, then a proper queue data structure is
+ * required. But until then, just keep it simple.
*/
static void cec_queue_event_fh(struct cec_fh *fh,
const struct cec_event *new_ev, u64 ts)
{
- struct cec_event_queue *evq = &fh->evqueue[new_ev->event - 1];
- struct cec_event *ev;
+ struct cec_event *ev = &fh->events[new_ev->event - 1];
if (ts == 0)
ts = ktime_get_ns();
mutex_lock(&fh->lock);
- ev = evq->events + evq->num_events;
- /* Overwrite the last event if there is no more room for the new event
*/
- if (evq->num_events == evq->elems) {
- ev--;
- } else {
- evq->num_events++;
- fh->events++;
+ if (new_ev->event == CEC_EVENT_LOST_MSGS &&
+ fh->pending_events & (1 << new_ev->event)) {
+ /*
+ * If there is already a lost_msgs event, then just
+ * update the lost_msgs count. This effectively
+ * merges the old and new events into one.
+ */
+ ev->lost_msgs.lost_msgs += new_ev->lost_msgs.lost_msgs;
+ goto unlock;
}
+
+ /*
+ * Intermediate states are not interesting, so just
+ * overwrite any older event.
+ */
*ev = *new_ev;
ev->ts = ts;
+ fh->pending_events |= 1 << new_ev->event;
+
+unlock:
mutex_unlock(&fh->lock);
wake_up_interruptible(&fh->wait);
}
@@ -185,27 +169,35 @@ static void cec_queue_event(struct cec_adapter *adap,
*/
static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg)
{
- struct cec_event ev_lost_msg = {
+ static const struct cec_event ev_lost_msg = {
.event = CEC_EVENT_LOST_MSGS,
+ .lost_msgs.lost_msgs = 1,
};
struct cec_msg_entry *entry;
mutex_lock(&fh->lock);
- if (fh->queued_msgs == CEC_MAX_MSG_QUEUE_SZ)
- goto lost_msgs;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
goto lost_msgs;
entry->msg = *msg;
- list_add(&entry->list, &fh->msgs);
+ /* Add new msg at the end of the queue */
+ list_add_tail(&entry->list, &fh->msgs);
+
+ /*
+ * if the queue now has more than CEC_MAX_MSG_QUEUE_SZ
+ * messages, drop the oldest one and send a lost message event.
+ */
+ if (fh->queued_msgs == CEC_MAX_MSG_QUEUE_SZ) {
+ list_del(&entry->list);
+ goto lost_msgs;
+ }
fh->queued_msgs++;
mutex_unlock(&fh->lock);
wake_up_interruptible(&fh->wait);
return;
lost_msgs:
- ev_lost_msg.lost_msgs.lost_msgs = ++fh->lost_msgs;
mutex_unlock(&fh->lock);
cec_queue_event_fh(fh, &ev_lost_msg, 0);
}
@@ -548,12 +540,13 @@ void cec_transmit_done(struct cec_adapter *adap, u8
status, u8 arb_lost_cnt,
cec_queue_msg_monitor(adap, msg, 1);
/*
- * Clear reply on error of if the adapter is no longer
- * configured. It makes no sense to wait for a reply in
- * this case.
+ * Clear reply and timeout on error or if the adapter is no longer
+ * configured. It makes no sense to wait for a reply in that case.
*/
- if (!(status & CEC_TX_STATUS_OK) || !adap->is_configured)
+ if (!(status & CEC_TX_STATUS_OK) || !adap->is_configured) {
msg->reply = 0;
+ msg->timeout = 0;
+ }
if (msg->timeout) {
/*
@@ -908,7 +901,7 @@ static int cec_report_features(struct cec_adapter *adap,
unsigned int la_idx)
msg.msg[3] = las->all_device_types[la_idx];
/* Write RC Profiles first, then Device Features */
- for (idx = 0; idx < sizeof(las->features[0]); idx++) {
+ for (idx = 0; idx < ARRAY_SIZE(las->features[0]); idx++) {
msg.msg[msg.len++] = features[idx];
if ((features[idx] & CEC_OP_FEAT_EXT) == 0) {
if (op_is_dev_features)
@@ -1543,14 +1536,15 @@ static int __cec_s_log_addrs(struct cec_adapter *adap,
if (log_addrs->cec_version < CEC_OP_CEC_VERSION_2_0)
continue;
- for (i = 0; i < sizeof(log_addrs->features[0]); i++) {
+ for (i = 0; i < ARRAY_SIZE(log_addrs->features[0]); i++) {
if ((features[i] & 0x80) == 0) {
if (op_is_dev_features)
break;
op_is_dev_features = true;
}
}
- if (!op_is_dev_features || i == sizeof(log_addrs->features[0]))
{
+ if (!op_is_dev_features ||
+ i == ARRAY_SIZE(log_addrs->features[0])) {
dprintk(1, "malformed features\n");
return -EINVAL;
}
@@ -1596,6 +1590,7 @@ int cec_s_log_addrs(struct cec_adapter *adap,
}
EXPORT_SYMBOL_GPL(cec_s_log_addrs);
+#ifdef CONFIG_MEDIA_CEC_DEBUG
/*
* Log the current state of the CEC adapter.
* Very useful for debugging.
@@ -1637,6 +1632,7 @@ static int cec_status(struct seq_file *file, void *priv)
mutex_unlock(&adap->lock);
return 0;
}
+#endif
/* CEC file operations */
@@ -1655,7 +1651,7 @@ static unsigned int cec_poll(struct file *filp,
res |= POLLOUT | POLLWRNORM;
if (fh->queued_msgs)
res |= POLLIN | POLLRDNORM;
- if (fh->events)
+ if (fh->pending_events)
res |= POLLPRI;
poll_wait(filp, &fh->wait, poll);
mutex_unlock(&adap->lock);
@@ -1685,6 +1681,149 @@ static void cec_monitor_all_cnt_dec(struct cec_adapter
*adap)
WARN_ON(call_op(adap, adap_monitor_all_enable, 0));
}
+static bool cec_is_busy(const struct cec_adapter *adap,
+ const struct cec_fh *fh)
+{
+ bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
+ bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
+
+ /*
+ * Exclusive initiators and followers can always access the CEC adapter
+ */
+ if (valid_initiator || valid_follower)
+ return false;
+ /*
+ * All others can only access the CEC adapter if there is no
+ * exclusive initiator and they are in INITIATOR mode.
+ */
+ return adap->cec_initiator ||
+ fh->mode_initiator == CEC_MODE_NO_INITIATOR;
+}
+
+static long cec_adap_g_caps(struct cec_adapter *adap,
+ struct cec_caps __user *parg)
+{
+ struct cec_caps caps = {};
+
+ strlcpy(caps.driver, adap->devnode.parent->driver->name,
+ sizeof(caps.driver));
+ strlcpy(caps.name, adap->name, sizeof(caps.name));
+ caps.available_log_addrs = adap->available_log_addrs;
+ caps.capabilities = adap->capabilities;
+ caps.version = LINUX_VERSION_CODE;
+ if (copy_to_user(parg, &caps, sizeof(caps)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_adap_g_phys_addr(struct cec_adapter *adap,
+ __u16 __user *parg)
+{
+ u16 phys_addr;
+
+ mutex_lock(&adap->lock);
+ phys_addr = adap->phys_addr;
+ mutex_unlock(&adap->lock);
+ if (copy_to_user(parg, &phys_addr, sizeof(phys_addr)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, __u16 __user *parg)
+{
+ u16 phys_addr;
+ long err;
+
+ if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
+ return -ENOTTY;
+ if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
+ return -EFAULT;
+
+ err = cec_phys_addr_validate(phys_addr, NULL, NULL);
+ if (err)
+ return err;
+ mutex_lock(&adap->lock);
+ if (cec_is_busy(adap, fh))
+ err = -EBUSY;
+ else
+ __cec_s_phys_addr(adap, phys_addr, block);
+ mutex_unlock(&adap->lock);
+ return err;
+}
+
+static long cec_adap_g_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs __user *parg)
+{
+ struct cec_log_addrs log_addrs;
+
+ mutex_lock(&adap->lock);
+ log_addrs = adap->log_addrs;
+ if (!adap->is_configured)
+ memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
+ sizeof(log_addrs.log_addr));
+ mutex_unlock(&adap->lock);
+
+ if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_log_addrs __user *parg)
+{
+ struct cec_log_addrs log_addrs;
+ long err = -EBUSY;
+
+ if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
+ return -ENOTTY;
+ if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
+ return -EFAULT;
+ log_addrs.flags = 0;
+ mutex_lock(&adap->lock);
+ if (!adap->is_configuring &&
+ (!log_addrs.num_log_addrs || !adap->is_configured) &&
+ !cec_is_busy(adap, fh)) {
+ err = __cec_s_log_addrs(adap, &log_addrs, block);
+ if (!err)
+ log_addrs = adap->log_addrs;
+ }
+ mutex_unlock(&adap->lock);
+ if (err)
+ return err;
+ if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_msg __user *parg)
+{
+ struct cec_msg msg = {};
+ long err = 0;
+
+ if (!(adap->capabilities & CEC_CAP_TRANSMIT))
+ return -ENOTTY;
+ if (copy_from_user(&msg, parg, sizeof(msg)))
+ return -EFAULT;
+ mutex_lock(&adap->lock);
+ if (!adap->is_configured) {
+ err = -ENONET;
+ } else if (cec_is_busy(adap, fh)) {
+ err = -EBUSY;
+ } else {
+ if (!block || !msg.reply)
+ fh = NULL;
+ err = cec_transmit_msg_fh(adap, &msg, fh, block);
+ }
+ mutex_unlock(&adap->lock);
+ if (err)
+ return err;
+ if (copy_to_user(parg, &msg, sizeof(msg)))
+ return -EFAULT;
+ return 0;
+}
+
/* Called by CEC_RECEIVE: wait for a message to arrive */
static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
{
@@ -1703,15 +1842,16 @@ static int cec_receive_msg(struct cec_fh *fh, struct
cec_msg *msg, bool block)
*msg = entry->msg;
kfree(entry);
fh->queued_msgs--;
- res = 0;
- } else {
- /* No, return EAGAIN in non-blocking mode or wait */
- res = -EAGAIN;
+ mutex_unlock(&fh->lock);
+ return 0;
}
+
+ /* No, return EAGAIN in non-blocking mode or wait */
mutex_unlock(&fh->lock);
- /* Return when in non-blocking mode or if we have a message */
- if (!block || !res)
- break;
+
+ /* Return when in non-blocking mode */
+ if (!block)
+ return -EAGAIN;
if (msg->timeout) {
/* The user specified a timeout */
@@ -1732,322 +1872,222 @@ static int cec_receive_msg(struct cec_fh *fh, struct
cec_msg *msg, bool block)
return res;
}
-static bool cec_is_busy(const struct cec_adapter *adap,
- const struct cec_fh *fh)
+static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_msg __user *parg)
{
- bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
- bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
+ struct cec_msg msg = {};
+ long err = 0;
- /*
- * Exclusive initiators and followers can always access the CEC adapter
- */
- if (valid_initiator || valid_follower)
- return false;
- /*
- * All others can only access the CEC adapter if there is no
- * exclusive initiator and they are in INITIATOR mode.
- */
- return adap->cec_initiator ||
- fh->mode_initiator == CEC_MODE_NO_INITIATOR;
+ if (copy_from_user(&msg, parg, sizeof(msg)))
+ return -EFAULT;
+ mutex_lock(&adap->lock);
+ if (!adap->is_configured)
+ err = -ENONET;
+ mutex_unlock(&adap->lock);
+ if (err)
+ return err;
+
+ err = cec_receive_msg(fh, &msg, block);
+ if (err)
+ return err;
+ if (copy_to_user(parg, &msg, sizeof(msg)))
+ return -EFAULT;
+ return 0;
}
-static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_event __user *parg)
{
- struct cec_devnode *devnode = cec_devnode_data(filp);
- struct cec_fh *fh = filp->private_data;
- struct cec_adapter *adap = fh->adap;
- bool block = !(filp->f_flags & O_NONBLOCK);
- void __user *parg = (void __user *)arg;
- int err = 0;
-
- if (!devnode->registered)
- return -EIO;
+ struct cec_event *ev = NULL;
+ u64 ts = ~0ULL;
+ unsigned int i;
+ long err = 0;
- switch (cmd) {
- case CEC_ADAP_G_CAPS: {
- struct cec_caps caps = {};
-
- strlcpy(caps.driver, adap->devnode.parent->driver->name,
- sizeof(caps.driver));
- strlcpy(caps.name, adap->name, sizeof(caps.name));
- caps.available_log_addrs = adap->available_log_addrs;
- caps.capabilities = adap->capabilities;
- caps.version = LINUX_VERSION_CODE;
- if (copy_to_user(parg, &caps, sizeof(caps)))
- return -EFAULT;
- break;
+ mutex_lock(&fh->lock);
+ while (!fh->pending_events && block) {
+ mutex_unlock(&fh->lock);
+ err = wait_event_interruptible(fh->wait, fh->pending_events);
+ if (err)
+ return err;
+ mutex_lock(&fh->lock);
}
- case CEC_TRANSMIT: {
- struct cec_msg msg = {};
-
- if (!(adap->capabilities & CEC_CAP_TRANSMIT))
- return -ENOTTY;
- if (copy_from_user(&msg, parg, sizeof(msg)))
- return -EFAULT;
- mutex_lock(&adap->lock);
- if (!adap->is_configured) {
- err = -ENONET;
- } else if (cec_is_busy(adap, fh)) {
- err = -EBUSY;
- } else {
- if (!block || !msg.reply)
- fh = NULL;
- err = cec_transmit_msg_fh(adap, &msg, fh, block);
+ /* Find the oldest event */
+ for (i = 0; i < CEC_NUM_EVENTS; i++) {
+ if (fh->pending_events & (1 << (i + 1)) &&
+ fh->events[i].ts <= ts) {
+ ev = &fh->events[i];
+ ts = ev->ts;
}
- mutex_unlock(&adap->lock);
- if (err)
- return err;
- if (copy_to_user(parg, &msg, sizeof(msg)))
- return -EFAULT;
- break;
+ }
+ if (!ev) {
+ err = -EAGAIN;
+ goto unlock;
}
- case CEC_RECEIVE: {
- struct cec_msg msg = {};
+ if (copy_to_user(parg, ev, sizeof(*ev))) {
+ err = -EFAULT;
+ goto unlock;
+ }
- if (copy_from_user(&msg, parg, sizeof(msg)))
- return -EFAULT;
- mutex_lock(&adap->lock);
- if (!adap->is_configured)
- err = -ENONET;
- mutex_unlock(&adap->lock);
- if (err)
- return err;
+ fh->pending_events &= ~(1 << ev->event);
- err = cec_receive_msg(fh, &msg, block);
- if (err)
- return err;
- if (copy_to_user(parg, &msg, sizeof(msg)))
- return -EFAULT;
- break;
- }
+unlock:
+ mutex_unlock(&fh->lock);
+ return err;
+}
- case CEC_DQEVENT: {
- struct cec_event_queue *evq = NULL;
- struct cec_event *ev = NULL;
- u64 ts = ~0ULL;
- unsigned int i;
+static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
+ u32 __user *parg)
+{
+ u32 mode = fh->mode_initiator | fh->mode_follower;
- mutex_lock(&fh->lock);
- while (!fh->events && block) {
- mutex_unlock(&fh->lock);
- err = wait_event_interruptible(fh->wait, fh->events);
- if (err)
- return err;
- mutex_lock(&fh->lock);
- }
+ if (copy_to_user(parg, &mode, sizeof(mode)))
+ return -EFAULT;
+ return 0;
+}
- /* Find the oldest event */
- for (i = 0; i < CEC_NUM_EVENTS; i++) {
- struct cec_event_queue *q = fh->evqueue + i;
+static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
+ u32 __user *parg)
+{
+ u32 mode;
+ u8 mode_initiator;
+ u8 mode_follower;
+ long err = 0;
+
+ if (copy_from_user(&mode, parg, sizeof(mode)))
+ return -EFAULT;
+ if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK))
+ return -EINVAL;
- if (q->num_events && q->events->ts <= ts) {
- evq = q;
- ev = q->events;
- ts = ev->ts;
- }
- }
- err = -EAGAIN;
- if (ev) {
- if (copy_to_user(parg, ev, sizeof(*ev))) {
- err = -EFAULT;
- } else {
- unsigned int j;
-
- evq->num_events--;
- fh->events--;
- /*
- * Reset lost message counter after returning
- * this event.
- */
- if (ev->event == CEC_EVENT_LOST_MSGS)
- fh->lost_msgs = 0;
- for (j = 0; j < evq->num_events; j++)
- evq->events[j] = evq->events[j + 1];
- err = 0;
- }
- }
- mutex_unlock(&fh->lock);
- return err;
- }
+ mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
+ mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
- case CEC_ADAP_G_PHYS_ADDR: {
- u16 phys_addr;
+ if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
+ mode_follower > CEC_MODE_MONITOR_ALL)
+ return -EINVAL;
- mutex_lock(&adap->lock);
- phys_addr = adap->phys_addr;
- if (copy_to_user(parg, &phys_addr, sizeof(adap->phys_addr)))
- err = -EFAULT;
- mutex_unlock(&adap->lock);
- break;
- }
+ if (mode_follower == CEC_MODE_MONITOR_ALL &&
+ !(adap->capabilities & CEC_CAP_MONITOR_ALL))
+ return -EINVAL;
- case CEC_ADAP_S_PHYS_ADDR: {
- u16 phys_addr;
+ /* Follower modes should always be able to send CEC messages */
+ if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
+ !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
+ mode_follower >= CEC_MODE_FOLLOWER &&
+ mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU)
+ return -EINVAL;
- if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
- return -ENOTTY;
- if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
- return -EFAULT;
+ /* Monitor modes require CEC_MODE_NO_INITIATOR */
+ if (mode_initiator && mode_follower >= CEC_MODE_MONITOR)
+ return -EINVAL;
- err = cec_phys_addr_validate(phys_addr, NULL, NULL);
- if (err)
- return err;
- mutex_lock(&adap->lock);
- if (cec_is_busy(adap, fh))
- err = -EBUSY;
- else
- __cec_s_phys_addr(adap, phys_addr, block);
- mutex_unlock(&adap->lock);
- break;
- }
+ /* Monitor modes require CAP_NET_ADMIN */
+ if (mode_follower >= CEC_MODE_MONITOR && !capable(CAP_NET_ADMIN))
+ return -EPERM;
- case CEC_ADAP_G_LOG_ADDRS: {
- struct cec_log_addrs log_addrs;
+ mutex_lock(&adap->lock);
+ /*
+ * You can't become exclusive follower if someone else already
+ * has that job.
+ */
+ if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
+ mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
+ adap->cec_follower && adap->cec_follower != fh)
+ err = -EBUSY;
+ /*
+ * You can't become exclusive initiator if someone else already
+ * has that job.
+ */
+ if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
+ adap->cec_initiator && adap->cec_initiator != fh)
+ err = -EBUSY;
- mutex_lock(&adap->lock);
- log_addrs = adap->log_addrs;
- if (!adap->is_configured)
- memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
- sizeof(log_addrs.log_addr));
- mutex_unlock(&adap->lock);
+ if (!err) {
+ bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
+ bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
- if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
- return -EFAULT;
- break;
+ if (old_mon_all != new_mon_all) {
+ if (new_mon_all)
+ err = cec_monitor_all_cnt_inc(adap);
+ else
+ cec_monitor_all_cnt_dec(adap);
+ }
}
- case CEC_ADAP_S_LOG_ADDRS: {
- struct cec_log_addrs log_addrs;
-
- if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
- return -ENOTTY;
- if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
- return -EFAULT;
- log_addrs.flags = 0;
- mutex_lock(&adap->lock);
- if (adap->is_configuring)
- err = -EBUSY;
- else if (log_addrs.num_log_addrs && adap->is_configured)
- err = -EBUSY;
- else if (cec_is_busy(adap, fh))
- err = -EBUSY;
- else
- err = __cec_s_log_addrs(adap, &log_addrs, block);
- if (!err)
- log_addrs = adap->log_addrs;
+ if (err) {
mutex_unlock(&adap->lock);
- if (!err && copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
- return -EFAULT;
- break;
+ return err;
}
- case CEC_G_MODE: {
- u32 mode = fh->mode_initiator | fh->mode_follower;
-
- if (copy_to_user(parg, &mode, sizeof(mode)))
- return -EFAULT;
- break;
+ if (fh->mode_follower == CEC_MODE_FOLLOWER)
+ adap->follower_cnt--;
+ if (mode_follower == CEC_MODE_FOLLOWER)
+ adap->follower_cnt++;
+ if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
+ mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
+ adap->passthrough =
+ mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
+ adap->cec_follower = fh;
+ } else if (adap->cec_follower == fh) {
+ adap->passthrough = false;
+ adap->cec_follower = NULL;
}
+ if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
+ adap->cec_initiator = fh;
+ else if (adap->cec_initiator == fh)
+ adap->cec_initiator = NULL;
+ fh->mode_initiator = mode_initiator;
+ fh->mode_follower = mode_follower;
+ mutex_unlock(&adap->lock);
+ return 0;
+}
- case CEC_S_MODE: {
- u32 mode;
- u8 mode_initiator;
- u8 mode_follower;
+static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct cec_devnode *devnode = cec_devnode_data(filp);
+ struct cec_fh *fh = filp->private_data;
+ struct cec_adapter *adap = fh->adap;
+ bool block = !(filp->f_flags & O_NONBLOCK);
+ void __user *parg = (void __user *)arg;
- if (copy_from_user(&mode, parg, sizeof(mode)))
- return -EFAULT;
- if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK))
- return -EINVAL;
+ if (!devnode->registered)
+ return -EIO;
- mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
- mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
+ switch (cmd) {
+ case CEC_ADAP_G_CAPS:
+ return cec_adap_g_caps(adap, parg);
- if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
- mode_follower > CEC_MODE_MONITOR_ALL)
- return -EINVAL;
+ case CEC_ADAP_G_PHYS_ADDR:
+ return cec_adap_g_phys_addr(adap, parg);
- if (mode_follower == CEC_MODE_MONITOR_ALL &&
- !(adap->capabilities & CEC_CAP_MONITOR_ALL))
- return -EINVAL;
+ case CEC_ADAP_S_PHYS_ADDR:
+ return cec_adap_s_phys_addr(adap, fh, block, parg);
- /* Follower modes should always be able to send CEC messages */
- if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
- !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
- mode_follower >= CEC_MODE_FOLLOWER &&
- mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU)
- return -EINVAL;
+ case CEC_ADAP_G_LOG_ADDRS:
+ return cec_adap_g_log_addrs(adap, parg);
- /* Monitor modes require CEC_MODE_NO_INITIATOR */
- if (mode_initiator && mode_follower >= CEC_MODE_MONITOR)
- return -EINVAL;
+ case CEC_ADAP_S_LOG_ADDRS:
+ return cec_adap_s_log_addrs(adap, fh, block, parg);
- /* Monitor modes require CAP_NET_ADMIN */
- if (mode_follower >= CEC_MODE_MONITOR &&
!capable(CAP_NET_ADMIN))
- return -EPERM;
+ case CEC_TRANSMIT:
+ return cec_transmit(adap, fh, block, parg);
- mutex_lock(&adap->lock);
- /*
- * You can't become exclusive follower if someone else already
- * has that job.
- */
- if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
- mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
- adap->cec_follower && adap->cec_follower != fh)
- err = -EBUSY;
- /*
- * You can't become exclusive initiator if someone else already
- * has that job.
- */
- if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
- adap->cec_initiator && adap->cec_initiator != fh)
- err = -EBUSY;
-
- if (!err) {
- bool old_mon_all = fh->mode_follower ==
CEC_MODE_MONITOR_ALL;
- bool new_mon_all = mode_follower ==
CEC_MODE_MONITOR_ALL;
-
- if (old_mon_all != new_mon_all) {
- if (new_mon_all)
- err = cec_monitor_all_cnt_inc(adap);
- else
- cec_monitor_all_cnt_dec(adap);
- }
- }
+ case CEC_RECEIVE:
+ return cec_receive(adap, fh, block, parg);
- if (err) {
- mutex_unlock(&adap->lock);
- break;
- }
+ case CEC_DQEVENT:
+ return cec_dqevent(adap, fh, block, parg);
- if (fh->mode_follower == CEC_MODE_FOLLOWER)
- adap->follower_cnt--;
- if (mode_follower == CEC_MODE_FOLLOWER)
- adap->follower_cnt++;
- if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
- mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
- adap->passthrough =
- mode_follower ==
CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
- adap->cec_follower = fh;
- } else if (adap->cec_follower == fh) {
- adap->passthrough = false;
- adap->cec_follower = NULL;
- }
- if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
- adap->cec_initiator = fh;
- else if (adap->cec_initiator == fh)
- adap->cec_initiator = NULL;
- fh->mode_initiator = mode_initiator;
- fh->mode_follower = mode_follower;
- mutex_unlock(&adap->lock);
- break;
- }
+ case CEC_G_MODE:
+ return cec_g_mode(adap, fh, parg);
+
+ case CEC_S_MODE:
+ return cec_s_mode(adap, fh, parg);
default:
return -ENOTTY;
}
- return err;
}
static int cec_open(struct inode *inode, struct file *filp)
@@ -2064,18 +2104,10 @@ static int cec_open(struct inode *inode, struct file
*filp)
.event = CEC_EVENT_STATE_CHANGE,
.flags = CEC_EVENT_FL_INITIAL_STATE,
};
- int ret;
if (!fh)
return -ENOMEM;
- ret = cec_queue_event_init(fh);
-
- if (ret) {
- kfree(fh);
- return ret;
- }
-
INIT_LIST_HEAD(&fh->msgs);
INIT_LIST_HEAD(&fh->xfer_list);
mutex_init(&fh->lock);
@@ -2098,7 +2130,6 @@ static int cec_open(struct inode *inode, struct file
*filp)
*/
if (!devnode->registered) {
mutex_unlock(&cec_devnode_lock);
- cec_queue_event_free(fh);
kfree(fh);
return -ENXIO;
}
@@ -2162,7 +2193,6 @@ static int cec_release(struct inode *inode, struct file
*filp)
list_del(&entry->list);
kfree(entry);
}
- cec_queue_event_free(fh);
kfree(fh);
/*
@@ -2201,9 +2231,8 @@ static struct bus_type cec_bus_type = {
.name = CEC_NAME,
};
-/**
- * cec_devnode_register - register a cec device node
- * @devnode: cec device node structure we want to register
+/*
+ * Register a cec device node
*
* The registration code assigns minor numbers and registers the new device
node
* with the kernel. An error is returned if no free minor number can be found,
@@ -2267,13 +2296,11 @@ cdev_del:
cdev_del(&devnode->cdev);
clr_bit:
clear_bit(devnode->minor, cec_devnode_nums);
- put_device(&devnode->dev);
return ret;
}
-/**
- * cec_devnode_unregister - unregister a cec device node
- * @devnode: the device node to unregister
+/*
+ * Unregister a cec device node
*
* This unregisters the passed device. Future open calls will be met with
* errors.
@@ -2371,6 +2398,7 @@ struct cec_adapter *cec_allocate_adapter(const struct
cec_adap_ops *ops,
adap->rc->input_id.version = 1;
adap->rc->dev.parent = parent;
adap->rc->driver_type = RC_DRIVER_SCANCODE;
+ adap->rc->driver_name = CEC_NAME;
adap->rc->allowed_protocols = RC_BIT_CEC;
adap->rc->priv = adap;
adap->rc->map_name = RC_MAP_CEC;
@@ -2404,16 +2432,17 @@ int cec_register_adapter(struct cec_adapter *adap)
#endif
res = cec_devnode_register(&adap->devnode, adap->owner);
-#if IS_ENABLED(CONFIG_RC_CORE)
if (res) {
+#if IS_ENABLED(CONFIG_RC_CORE)
/* Note: rc_unregister also calls rc_free */
rc_unregister_device(adap->rc);
adap->rc = NULL;
+#endif
return res;
}
-#endif
dev_set_drvdata(&adap->devnode.dev, adap);
+#ifdef CONFIG_MEDIA_CEC_DEBUG
if (!top_cec_dir)
return 0;
@@ -2429,6 +2458,7 @@ int cec_register_adapter(struct cec_adapter *adap)
debugfs_remove_recursive(adap->cec_dir);
adap->cec_dir = NULL;
}
+#endif
return 0;
}
EXPORT_SYMBOL_GPL(cec_register_adapter);
@@ -2481,11 +2511,13 @@ static int __init cec_devnode_init(void)
return ret;
}
+#ifdef CONFIG_MEDIA_CEC_DEBUG
top_cec_dir = debugfs_create_dir("cec", NULL);
if (IS_ERR_OR_NULL(top_cec_dir)) {
pr_warn("cec: Failed to create debugfs cec dir\n");
top_cec_dir = NULL;
}
+#endif
ret = bus_register(&cec_bus_type);
if (ret < 0) {
diff --git a/include/linux/cec-funcs.h b/include/linux/cec-funcs.h
index 155f6b9..8ee1029 100644
--- a/include/linux/cec-funcs.h
+++ b/include/linux/cec-funcs.h
@@ -17,6 +17,12 @@
* SOFTWARE.
*/
+/*
+ * Note: this framework is still in staging and it is likely the API
+ * will change before it goes out of staging.
+ *
+ * Once it is moved out of staging this header will move to uapi.
+ */
#ifndef _CEC_UAPI_FUNCS_H
#define _CEC_UAPI_FUNCS_H
diff --git a/include/linux/cec.h b/include/linux/cec.h
index 0fd0e31..40924e7 100644
--- a/include/linux/cec.h
+++ b/include/linux/cec.h
@@ -17,6 +17,12 @@
* SOFTWARE.
*/
+/*
+ * Note: this framework is still in staging and it is likely the API
+ * will change before it goes out of staging.
+ *
+ * Once it is moved out of staging this header will move to uapi.
+ */
#ifndef _CEC_UAPI_H
#define _CEC_UAPI_H
diff --git a/include/media/cec.h b/include/media/cec.h
index 25d89b1..9a791c0 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -85,12 +85,6 @@ struct cec_msg_entry {
#define CEC_NUM_EVENTS CEC_EVENT_LOST_MSGS
-struct cec_event_queue {
- unsigned int elems;
- unsigned int num_events;
- struct cec_event *events;
-};
-
struct cec_fh {
struct list_head list;
struct list_head xfer_list;
@@ -100,12 +94,11 @@ struct cec_fh {
/* Events */
wait_queue_head_t wait;
- unsigned int events;
- struct cec_event_queue evqueue[CEC_NUM_EVENTS];
+ unsigned int pending_events;
+ struct cec_event events[CEC_NUM_EVENTS];
struct mutex lock;
struct list_head msgs; /* queued messages */
unsigned int queued_msgs;
- unsigned int lost_msgs;
};
#define CEC_SIGNAL_FREE_TIME_RETRY 3
@@ -133,9 +126,12 @@ struct cec_adap_ops {
* With a transfer rate of at most 36 bytes per second this makes 18 messages
* per second worst case.
*
- * We queue at most 10 seconds worth of messages.
+ * We queue at most 3 seconds worth of messages. The CEC specification requires
+ * that messages are replied to within a second, so 3 seconds should give more
+ * than enough margin. Since most messages are actually more than 2 bytes, this
+ * is in practice a lot more than 3 seconds.
*/
-#define CEC_MAX_MSG_QUEUE_SZ (18 * 10)
+#define CEC_MAX_MSG_QUEUE_SZ (18 * 3)
struct cec_adapter {
struct module *owner;
--
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