Added two new RPMSG IOCTLs for rpmsg_char- RPMSG_GET_SIGNAL_IOCTRL and
RPMSG_SET_SIGNAL_IOCTRL, to set/get the flow.
Addressed review comments for changing variable names/ desciptions.
Sarannya S (3):
rpmsg: core: Add signal API support
rpmsg: glink: Add support to handle signals command
rpmsg: char: Add RPMSG GET/SET SIGNAL IOCTL support
drivers/rpmsg/qcom_glink_native.c | 63 +++++++++++++++++++++++++++++++++++++++
drivers/rpmsg/rpmsg_char.c | 58 ++++++++++++++++++++++++++++++-----
drivers/rpmsg/rpmsg_core.c | 20 +++++++++++++
drivers/rpmsg/rpmsg_internal.h | 2 ++
include/linux/rpmsg.h | 15 ++++++++++
include/uapi/linux/rpmsg.h | 12 +++++++-
6 files changed, 162 insertions(+), 8 deletions(-)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Some transports like Glink support the state notifications between
clients using flow control signals similar to serial protocol signals.
Local glink client drivers can send and receive flow control status
to glink clients running on remote processors.
Add APIs to support sending and receiving of flow control status by
rpmsg clients.
Signed-off-by: Deepak Kumar Singh <[email protected]>
Signed-off-by: Sarannya S <[email protected]>
---
drivers/rpmsg/rpmsg_core.c | 20 ++++++++++++++++++++
drivers/rpmsg/rpmsg_internal.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index d6dde00e..e96967a 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -331,6 +331,24 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
EXPORT_SYMBOL(rpmsg_trysend_offchannel);
/**
+ * rpmsg_set_flow_control() - sets/clears serial flow control signals
+ * @ept: the rpmsg endpoint
+ * @enable: pause/resume incoming data flow
+ *
+ * Return: 0 on success and an appropriate error value on failure.
+ */
+int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable)
+{
+ if (WARN_ON(!ept))
+ return -EINVAL;
+ if (!ept->ops->set_flow_control)
+ return -ENXIO;
+
+ return ept->ops->set_flow_control(ept, enable);
+}
+EXPORT_SYMBOL(rpmsg_set_flow_control);
+
+/**
* rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
* @ept: the rpmsg endpoint
*
@@ -539,6 +557,8 @@ static int rpmsg_dev_probe(struct device *dev)
rpdev->ept = ept;
rpdev->src = ept->addr;
+
+ ept->flow_cb = rpdrv->flowcontrol;
}
err = rpdrv->probe(rpdev);
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index 39b646d..4fea45a 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h
@@ -55,6 +55,7 @@ struct rpmsg_device_ops {
* @trysendto: see @rpmsg_trysendto(), optional
* @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
* @poll: see @rpmsg_poll(), optional
+ * @set_flow_control: see @rpmsg_set_flow_control(), optional
* @get_mtu: see @rpmsg_get_mtu(), optional
*
* Indirection table for the operations that a rpmsg backend should implement.
@@ -75,6 +76,7 @@ struct rpmsg_endpoint_ops {
void *data, int len);
__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
+ int (*set_flow_control)(struct rpmsg_endpoint *ept, bool enable);
ssize_t (*get_mtu)(struct rpmsg_endpoint *ept);
};
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Remote peripherals send signal notifications over glink with commandID 15.
Add support to send and receive the signal command and based signals
enable or disable flow control with remote host.
Signed-off-by: Chris Lew <[email protected]>
Signed-off-by: Deepak Kumar Singh <[email protected]>
Signed-off-by: Sarannya S <[email protected]>
---
drivers/rpmsg/qcom_glink_native.c | 63 +++++++++++++++++++++++++++++++++++++++
include/linux/rpmsg.h | 15 ++++++++++
2 files changed, 78 insertions(+)
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 115c0a1..01d0a49 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -17,6 +17,7 @@
#include <linux/rpmsg.h>
#include <linux/sizes.h>
#include <linux/slab.h>
+#include <linux/termios.h>
#include <linux/workqueue.h>
#include <linux/mailbox_client.h>
@@ -203,9 +204,15 @@ static const struct rpmsg_endpoint_ops glink_endpoint_ops;
#define RPM_CMD_TX_DATA_CONT 12
#define RPM_CMD_READ_NOTIF 13
#define RPM_CMD_RX_DONE_W_REUSE 14
+#define RPM_CMD_SIGNALS 15
#define GLINK_FEATURE_INTENTLESS BIT(1)
+#define NATIVE_DTR_SIG NATIVE_DSR_SIG
+#define NATIVE_DSR_SIG BIT(31)
+#define NATIVE_RTS_SIG NATIVE_CTS_SIG
+#define NATIVE_CTS_SIG BIT(30)
+
static void qcom_glink_rx_done_work(struct work_struct *work);
static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
@@ -1001,6 +1008,57 @@ static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
return 0;
}
+/**
+ * qcom_glink_set_flow_control() - convert a signal cmd to wire format and
+ * transmit
+ * @ept: Rpmsg endpoint for channel.
+ * @enable: True/False - enable or disable flow control
+ *
+ * Return: 0 on success or standard Linux error code.
+ */
+static int qcom_glink_set_flow_control(struct rpmsg_endpoint *ept, bool enable)
+{
+ struct glink_channel *channel = to_glink_channel(ept);
+ struct qcom_glink *glink = channel->glink;
+ struct glink_msg msg;
+ u32 sigs = 0;
+
+ if (enable)
+ sigs |= NATIVE_DTR_SIG | NATIVE_RTS_SIG;
+
+ msg.cmd = cpu_to_le16(RPM_CMD_SIGNALS);
+ msg.param1 = cpu_to_le16(channel->lcid);
+ msg.param2 = cpu_to_le32(sigs);
+
+ return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
+}
+
+static int qcom_glink_handle_signals(struct qcom_glink *glink,
+ unsigned int rcid, unsigned int sigs)
+{
+ struct glink_channel *channel;
+ unsigned long flags;
+ bool enable = false;
+
+ spin_lock_irqsave(&glink->idr_lock, flags);
+ channel = idr_find(&glink->rcids, rcid);
+ spin_unlock_irqrestore(&glink->idr_lock, flags);
+ if (!channel) {
+ dev_err(glink->dev, "signal for non-existing channel\n");
+ return -EINVAL;
+ }
+
+ if (!channel->ept.flow_cb)
+ return 0;
+
+ if (sigs & (NATIVE_DSR_SIG | NATIVE_CTS_SIG))
+ enable = true;
+
+ channel->ept.flow_cb(channel->ept.rpdev, channel->ept.priv, enable);
+
+ return 0;
+}
+
static irqreturn_t qcom_glink_native_intr(int irq, void *data)
{
struct qcom_glink *glink = data;
@@ -1065,6 +1123,10 @@ static irqreturn_t qcom_glink_native_intr(int irq, void *data)
qcom_glink_handle_intent_req_ack(glink, param1, param2);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
+ case RPM_CMD_SIGNALS:
+ qcom_glink_handle_signals(glink, param1, param2);
+ qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
+ break;
default:
dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
ret = -EINVAL;
@@ -1440,6 +1502,7 @@ static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
.sendto = qcom_glink_sendto,
.trysend = qcom_glink_trysend,
.trysendto = qcom_glink_trysendto,
+ .set_flow_control = qcom_glink_set_flow_control,
};
static void qcom_glink_rpdev_release(struct device *dev)
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 523c98b..cc7a917 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -64,12 +64,14 @@ struct rpmsg_device {
};
typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
+typedef int (*rpmsg_flowcontrol_cb_t)(struct rpmsg_device *, void *, bool);
/**
* struct rpmsg_endpoint - binds a local rpmsg address to its user
* @rpdev: rpmsg channel device
* @refcount: when this drops to zero, the ept is deallocated
* @cb: rx callback handler
+ * @flow_cb: remote flow control callback handler
* @cb_lock: must be taken before accessing/changing @cb
* @addr: local rpmsg address
* @priv: private data for the driver's use
@@ -92,6 +94,7 @@ struct rpmsg_endpoint {
struct rpmsg_device *rpdev;
struct kref refcount;
rpmsg_rx_cb_t cb;
+ rpmsg_flowcontrol_cb_t flow_cb;
struct mutex cb_lock;
u32 addr;
void *priv;
@@ -106,6 +109,7 @@ struct rpmsg_endpoint {
* @probe: invoked when a matching rpmsg channel (i.e. device) is found
* @remove: invoked when the rpmsg channel is removed
* @callback: invoked when an inbound message is received on the channel
+ * @flowcontrol: invoked when remote side flow control status is received
*/
struct rpmsg_driver {
struct device_driver drv;
@@ -113,6 +117,7 @@ struct rpmsg_driver {
int (*probe)(struct rpmsg_device *dev);
void (*remove)(struct rpmsg_device *dev);
int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
+ int (*flowcontrol)(struct rpmsg_device *, void *, bool);
};
static inline u16 rpmsg16_to_cpu(struct rpmsg_device *rpdev, __rpmsg16 val)
@@ -192,6 +197,8 @@ __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept);
+int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable);
+
#else
static inline int rpmsg_register_device_override(struct rpmsg_device *rpdev,
@@ -316,6 +323,14 @@ static inline ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
return -ENXIO;
}
+static inline int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return -ENXIO;
+}
+
#endif /* IS_ENABLED(CONFIG_RPMSG) */
/* use a macro to avoid include chaining to get THIS_MODULE */
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Add TICOMGET and TIOCMSET ioctl support for rpmsg char device nodes
to get/set the low level transport signals.
Signed-off-by: Chris Lew <[email protected]>
Signed-off-by: Deepak Kumar Singh <[email protected]>
Signed-off-by: Sarannya S <[email protected]>
---
drivers/rpmsg/rpmsg_char.c | 60 +++++++++++++++++++++++++++++++++++++++-------
include/uapi/linux/rpmsg.h | 11 +++++++++
2 files changed, 63 insertions(+), 8 deletions(-)
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 3e0b8f3..fdcb4ff 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -23,6 +23,7 @@
#include <linux/rpmsg.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
+#include <linux/termios.h>
#include <linux/uaccess.h>
#include <uapi/linux/rpmsg.h>
@@ -68,6 +69,8 @@ struct rpmsg_eptdev {
struct sk_buff_head queue;
wait_queue_head_t readq;
+ u32 remote_signals;
+ bool flow_control;
};
int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
@@ -109,7 +112,22 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
skb_queue_tail(&eptdev->queue, skb);
spin_unlock(&eptdev->queue_lock);
- /* wake up any blocking processes, waiting for new data */
+ wake_up_interruptible(&eptdev->readq);
+
+ return 0;
+}
+
+static int rpmsg_ept_flow_cb(struct rpmsg_device *rpdev, void *priv, bool enable)
+{
+ struct rpmsg_eptdev *eptdev = priv;
+
+ if (enable)
+ eptdev->remote_signals = RPMSG_FLOW_CONTROL_ON;
+ else
+ eptdev->remote_signals = 0;
+
+ eptdev->flow_control = true;
+
wake_up_interruptible(&eptdev->readq);
return 0;
@@ -146,6 +164,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
return -EINVAL;
}
+ ept->flow_cb = rpmsg_ept_flow_cb;
eptdev->ept = ept;
filp->private_data = eptdev;
mutex_unlock(&eptdev->ept_lock);
@@ -166,6 +185,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
eptdev->ept = NULL;
}
mutex_unlock(&eptdev->ept_lock);
+ eptdev->flow_control = false;
/* Discard all SKBs */
skb_queue_purge(&eptdev->queue);
@@ -279,6 +299,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
if (!skb_queue_empty(&eptdev->queue))
mask |= EPOLLIN | EPOLLRDNORM;
+ if (eptdev->flow_control)
+ mask |= EPOLLPRI;
+
mask |= rpmsg_poll(eptdev->ept, filp, wait);
return mask;
@@ -289,14 +312,35 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
{
struct rpmsg_eptdev *eptdev = fp->private_data;
- if (cmd != RPMSG_DESTROY_EPT_IOCTL)
- return -EINVAL;
-
- /* Don't allow to destroy a default endpoint. */
- if (eptdev->default_ept)
- return -EINVAL;
+ bool set;
+ u32 val;
+ int ret;
+
+ switch (cmd) {
+ case RPMSG_GET_SIGNAL_IOCTL:
+ eptdev->flow_control = false;
+ ret = put_user(eptdev->remote_signals, (int __user *)arg);
+ break;
+ case RPMSG_SET_SIGNAL_IOCTL:
+ ret = get_user(val, (int __user *)arg);
+ if (ret)
+ break;
+ set = (val & RPMSG_FLOW_CONTROL_ON) ? true : false;
+ ret = rpmsg_set_flow_control(eptdev->ept, set);
+ break;
+ case RPMSG_DESTROY_EPT_IOCTL:
+ /* Don't allow to destroy a default endpoint. */
+ if (eptdev->default_ept) {
+ ret = -EINVAL;
+ break;
+ }
+ ret = rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
+ break;
+ default:
+ ret = -EINVAL;
+ }
- return rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
+ return ret;
}
static const struct file_operations rpmsg_eptdev_fops = {
diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h
index 1637e68..e9aa6b9 100644
--- a/include/uapi/linux/rpmsg.h
+++ b/include/uapi/linux/rpmsg.h
@@ -10,6 +10,7 @@
#include <linux/types.h>
#define RPMSG_ADDR_ANY 0xFFFFFFFF
+#define RPMSG_FLOW_CONTROL_ON 0x001
/**
* struct rpmsg_endpoint_info - endpoint info representation
@@ -43,4 +44,14 @@ struct rpmsg_endpoint_info {
*/
#define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info)
+/**
+ * Get the remote rpmsg char device's flow control signal.
+ */
+#define RPMSG_GET_SIGNAL_IOCTL _IOW(0xb5, 0x5, struct rpmsg_endpoint_info)
+
+/**
+ * Set the flow control for the local rpmsg char device.
+ */
+#define RPMSG_SET_SIGNAL_IOCTL _IOW(0xb5, 0x6, struct rpmsg_endpoint_info)
+
#endif
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
On Tue, Feb 21, 2023 at 09:26:02PM +0530, Sarannya S wrote:
> Add TICOMGET and TIOCMSET ioctl support for rpmsg char device nodes
> to get/set the low level transport signals.
Please update subjet and this commit message as well.
>
> Signed-off-by: Chris Lew <[email protected]>
> Signed-off-by: Deepak Kumar Singh <[email protected]>
> Signed-off-by: Sarannya S <[email protected]>
> ---
> drivers/rpmsg/rpmsg_char.c | 60 +++++++++++++++++++++++++++++++++++++++-------
> include/uapi/linux/rpmsg.h | 11 +++++++++
> 2 files changed, 63 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index 3e0b8f3..fdcb4ff 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -23,6 +23,7 @@
> #include <linux/rpmsg.h>
> #include <linux/skbuff.h>
> #include <linux/slab.h>
> +#include <linux/termios.h>
> #include <linux/uaccess.h>
> #include <uapi/linux/rpmsg.h>
>
> @@ -68,6 +69,8 @@ struct rpmsg_eptdev {
> struct sk_buff_head queue;
> wait_queue_head_t readq;
>
> + u32 remote_signals;
> + bool flow_control;
> };
>
> int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
> @@ -109,7 +112,22 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
> skb_queue_tail(&eptdev->queue, skb);
> spin_unlock(&eptdev->queue_lock);
>
> - /* wake up any blocking processes, waiting for new data */
Is this comment no longer valid?
> + wake_up_interruptible(&eptdev->readq);
> +
> + return 0;
> +}
> +
> +static int rpmsg_ept_flow_cb(struct rpmsg_device *rpdev, void *priv, bool enable)
> +{
> + struct rpmsg_eptdev *eptdev = priv;
> +
> + if (enable)
> + eptdev->remote_signals = RPMSG_FLOW_CONTROL_ON;
> + else
> + eptdev->remote_signals = 0;
> +
> + eptdev->flow_control = true;
So remote_signals is the state of the remote's requested flow control
and flow_control is carrying the information that the flow control has
been requested, to interrupt poll.
I think something like remote_flow and remote_flow_updated would make
that more intuitive.
Also, remote_signals can be bool and you can just assign enable, no need
for the conditional.
> +
> wake_up_interruptible(&eptdev->readq);
>
> return 0;
> @@ -146,6 +164,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
> return -EINVAL;
> }
>
> + ept->flow_cb = rpmsg_ept_flow_cb;
> eptdev->ept = ept;
> filp->private_data = eptdev;
> mutex_unlock(&eptdev->ept_lock);
> @@ -166,6 +185,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
> eptdev->ept = NULL;
> }
> mutex_unlock(&eptdev->ept_lock);
> + eptdev->flow_control = false;
>
> /* Discard all SKBs */
> skb_queue_purge(&eptdev->queue);
> @@ -279,6 +299,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
> if (!skb_queue_empty(&eptdev->queue))
> mask |= EPOLLIN | EPOLLRDNORM;
>
> + if (eptdev->flow_control)
> + mask |= EPOLLPRI;
> +
> mask |= rpmsg_poll(eptdev->ept, filp, wait);
>
> return mask;
> @@ -289,14 +312,35 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
> {
> struct rpmsg_eptdev *eptdev = fp->private_data;
>
> - if (cmd != RPMSG_DESTROY_EPT_IOCTL)
> - return -EINVAL;
> -
> - /* Don't allow to destroy a default endpoint. */
> - if (eptdev->default_ept)
> - return -EINVAL;
> + bool set;
> + u32 val;
> + int ret;
> +
> + switch (cmd) {
> + case RPMSG_GET_SIGNAL_IOCTL:
Signals is a glink name for this, how about:
RPMSG_GET_OUTGOING_FLOWCONTROL
> + eptdev->flow_control = false;
> + ret = put_user(eptdev->remote_signals, (int __user *)arg);
> + break;
> + case RPMSG_SET_SIGNAL_IOCTL:
RPMSG_SET_INCOMING_FLOWCONTROL
> + ret = get_user(val, (int __user *)arg);
> + if (ret)
> + break;
> + set = (val & RPMSG_FLOW_CONTROL_ON) ? true : false;
The reason for only considering some bit(s) in the argument is to allow
for future expansion, but unless you validate that those bits are unused
by the caller you could end up with clients passing unexpected bits in
~1, effectively preventing such future modifications.
So if we're masking out the state, then we need to also reject (arg &
~1). But I would prefer that we instead treat it as a boolean and do:
set = !!arg;
> + ret = rpmsg_set_flow_control(eptdev->ept, set);
> + break;
> + case RPMSG_DESTROY_EPT_IOCTL:
> + /* Don't allow to destroy a default endpoint. */
> + if (eptdev->default_ept) {
> + ret = -EINVAL;
> + break;
> + }
> + ret = rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
> + break;
> + default:
> + ret = -EINVAL;
> + }
>
> - return rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
> + return ret;
> }
>
> static const struct file_operations rpmsg_eptdev_fops = {
> diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h
> index 1637e68..e9aa6b9 100644
> --- a/include/uapi/linux/rpmsg.h
> +++ b/include/uapi/linux/rpmsg.h
> @@ -10,6 +10,7 @@
> #include <linux/types.h>
>
> #define RPMSG_ADDR_ANY 0xFFFFFFFF
> +#define RPMSG_FLOW_CONTROL_ON 0x001
>
> /**
> * struct rpmsg_endpoint_info - endpoint info representation
> @@ -43,4 +44,14 @@ struct rpmsg_endpoint_info {
> */
> #define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info)
>
> +/**
> + * Get the remote rpmsg char device's flow control signal.
s/signal/state/
> + */
> +#define RPMSG_GET_SIGNAL_IOCTL _IOW(0xb5, 0x5, struct rpmsg_endpoint_info)
> +
> +/**
> + * Set the flow control for the local rpmsg char device.
> + */
> +#define RPMSG_SET_SIGNAL_IOCTL _IOW(0xb5, 0x6, struct rpmsg_endpoint_info)
> +
Regards,
Bjorn
> #endif
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>