Re: [PATCH v5 4/7] platform/chrome: Add Chrome OS EC userspace device interface

[Javier Martinez Canillas <javier.martinez@collabora.co.uk>]

Hello Olof,

Thanks a lot for your feedback.

On 02/26/2015 02:13 AM, Gwendal Grignou wrote:
> Olof,
> 
> I think the way Javier did it is fine, the 'major' of the ioctl is
> 0xEC, from ':'.
> 
> Gwendal.
>

As Gwendal said, I deliberately changed the IOCTL mayor number to
make it different in both kernels.

downstream:

#define CROS_EC_DEV_IOC              ':'
#define CROS_EC_DEV_IOCXCMD    _IOWR(':', 0, struct cros_ec_command)
#define CROS_EC_DEV_IOCRDMEM   _IOWR(':', 1, struct cros_ec_readmem)

mainline:

#define CROS_EC_DEV_IOC       0xEC
#define CROS_EC_DEV_IOCXCMD   _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command)
#define CROS_EC_DEV_IOCRDMEM  _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem)

I can also do what you suggested and keep ':' as the major and use 2/3
as command numbers but I just think 0xEC is a much nicer major for the
interface to talk with the Embedded Controller and it was available ;)

Best regards,
Javier