Add TICOMGET and TIOCMSET ioctl support for rpmsg char device nodes to get/set the low level transport signals. Signed-off-by: Chris Lew <quic_clew@xxxxxxxxxxx> Signed-off-by: Deepak Kumar Singh <quic_deesin@xxxxxxxxxxx> --- drivers/rpmsg/rpmsg_char.c | 60 +++++++++++++++++++++++++++++++++++++++------- 1 file changed, 52 insertions(+), 8 deletions(-) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 4f21891..1eb6e9d 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 rsigs; + bool sig_pending; }; int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data) @@ -107,7 +110,22 @@ 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_flow_cb(struct rpmsg_device *rpdev, void *priv, bool enable) +{ + struct rpmsg_eptdev *eptdev = priv; + + if (enable) + eptdev->rsigs = TIOCM_DSR | TIOCM_CTS; + else + eptdev->rsigs = 0; + + eptdev->sig_pending = true; + wake_up_interruptible(&eptdev->readq); return 0; @@ -144,6 +162,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) return -EINVAL; } + ept->flow_cb = rpmsg_flow_cb; eptdev->ept = ept; filp->private_data = eptdev; mutex_unlock(&eptdev->ept_lock); @@ -164,6 +183,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) eptdev->ept = NULL; } mutex_unlock(&eptdev->ept_lock); + eptdev->sig_pending = false; /* Discard all SKBs */ skb_queue_purge(&eptdev->queue); @@ -277,6 +297,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) if (!skb_queue_empty(&eptdev->queue)) mask |= EPOLLIN | EPOLLRDNORM; + if (eptdev->sig_pending) + mask |= EPOLLPRI; + mask |= rpmsg_poll(eptdev->ept, filp, wait); return mask; @@ -287,14 +310,35 @@ 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 TIOCMGET: + eptdev->sig_pending = false; + ret = put_user(eptdev->rsigs, (int __user *)arg); + break; + case TIOCMSET: + ret = get_user(val, (int __user *)arg); + if (ret) + break; + set = (val & (TIOCM_DTR | TIOCM_RTS)) ? 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 = { -- 2.7.4