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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-01-11 06:35:12 -0800
committerBjorn Andersson <bjorn.andersson@linaro.org>2017-01-18 10:43:15 -0800
commitc0cdc19f84a4712cf74888f83af286e3c2e14efd (patch)
tree59f3d77a9489cae13f86af2d1c3576720c89d0f8 /drivers/rpmsg/Kconfig
parentadaa11b02c34ebbcaa7dff43f9cfadd4a9a226fd (diff)
rpmsg: Driver for user space endpoint interface
This driver allows rpmsg instances to expose access to rpmsg endpoints to user space processes. It provides a control interface, allowing userspace to export endpoints and an endpoint interface for each exposed endpoint. The implementation is based on prior art by Texas Instrument, Google, PetaLogix and was derived from a FreeRTOS performance statistics driver written by Michal Simek. The control interface provides a "create endpoint" ioctl, which is fed a name, source and destination address. The three values are used to create the endpoint, in a backend-specific way, and a rpmsg endpoint device is created - with the three parameters are available in sysfs for udev usage. E.g. to create an endpoint device for one of the Qualcomm SMD channel related to DIAG one would issue: struct rpmsg_endpoint_info info = { "DIAG_CNTL", 0, 0 }; int fd = open("/dev/rpmsg_ctrl0", O_RDWR); ioctl(fd, RPMSG_CREATE_EPT_IOCTL, &info); Each created endpoint device shows up as an individual character device in /dev, allowing permission to be controlled on a per-endpoint basis. The rpmsg endpoint will be created and destroyed following the opening and closing of the endpoint device, allowing rpmsg backends to open and close the physical channel, if supported by the wire protocol. Cc: Marek Novak <marek.novak@nxp.com> Cc: Matteo Sartori <matteo.sartori@t3lab.it> Cc: Michal Simek <monstr@monstr.eu> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/rpmsg/Kconfig')
-rw-r--r--drivers/rpmsg/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig
index de31c5f14dd9..fa0d582efb3d 100644
--- a/drivers/rpmsg/Kconfig
+++ b/drivers/rpmsg/Kconfig
@@ -4,6 +4,14 @@ menu "Rpmsg drivers"
config RPMSG
tristate
+config RPMSG_CHAR
+ tristate "RPMSG device interface"
+ depends on RPMSG
+ help
+ Say Y here to export rpmsg endpoints as device files, usually found
+ in /dev. They make it possible for user-space programs to send and
+ receive rpmsg packets.
+
config RPMSG_QCOM_SMD
tristate "Qualcomm Shared Memory Driver (SMD)"
depends on QCOM_SMEM

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