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Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org Hi Boris, From: Vitor Soares Date: Wed, Feb 19, 2020 at 00:20:38 > For today there is no way to use i3c devices from user space and > the introduction of such API will help developers during the i3c device > or i3c host controllers development. > > The i3cdev module is highly based on i2c-dev and yet I tried to address > the concerns raised in [1]. > > NOTES: > - The i3cdev dynamically request an unused major number. > > - The i3c devices are dynamically exposed/removed from dev/ folder based > on if they have a device driver bound to it. > > - For now, the module exposes i3c devices without device driver on > dev/bus/i3c/- > > - As in the i2c subsystem, here it is exposed the i3c_priv_xfer to > userspace. I tried to use a dedicated structure as in spidev but I don't > see any obvious advantage. > > - Since the i3c API only exposes i3c_priv_xfer to devices, for now, the > module just makes use of one ioctl(). This can change in the future with > the introduction hdr commands or by the need of exposing some CCC > commands to the device API (private contract between master-slave). > Regarding the i3c device info, some information is already available > through sysfs. We can add more device attributes to expose more > information or add a dedicated ioctl() request for that purpose or both. > > - Similar to i2c, I have also created a tool that you can find in [2] > for testing purposes. If you have some time available I would appreciate > your feedback about it as well. > > [1] https://lkml.org/lkml/2018/11/15/853 > [2] https://github.com/vitor-soares-snps/i3c-tools.git > > Changes in v3: > Use the xfer_lock to prevent device detach during ioctl call > Expose i3cdev under /dev/bus/i3c/ folder like usb does > Change NOTIFY_BOUND to NOTIFY_BIND, this allows the device detach occur > before driver->probe call > Avoid use of IS_ERR_OR_NULL > Use u64_to_user_ptr instead of (void __user *)(uintptr_t) cast > Allocate k_xfer and data_ptrs at once and eliminate double allocation > check > Pass i3cdev to dev->driver_data > Make all minors available > Add API documentation > > Changes in v2: > Use IDR api for minor numbering > Modify ioctl struct > Fix SPDX license > > Vitor Soares (5): > i3c: master: export i3c_masterdev_type > i3c: master: export i3c_bus_type symbol > i3c: master: add i3c_for_each_dev helper > i3c: add i3cdev module to expose i3c dev in /dev > userspace-api: add i3cdev documentation > > Documentation/userspace-api/i3c/i3cdev.rst | 116 ++++++++ > drivers/i3c/Kconfig | 15 + > drivers/i3c/Makefile | 1 + > drivers/i3c/i3cdev.c | 429 +++++++++++++++++++++++++++++ > drivers/i3c/internals.h | 2 + > drivers/i3c/master.c | 16 +- > include/uapi/linux/i3c/i3cdev.h | 38 +++ > 7 files changed, 616 insertions(+), 1 deletion(-) > create mode 100644 Documentation/userspace-api/i3c/i3cdev.rst > create mode 100644 drivers/i3c/i3cdev.c > create mode 100644 include/uapi/linux/i3c/i3cdev.h > > -- > 2.7.4 I want to make you know that none of your previous comments was ignored and I would like to start the discussion from this point. Best regards, Vitor Soares _______________________________________________ linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c