diff options
| author | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2019-09-02 18:08:48 +0200 |
|---|---|---|
| committer | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2019-09-12 16:20:54 +0200 |
| commit | 96a0a80738461d6d2421ae64ee9990b702efd2a6 (patch) | |
| tree | 2e76f435ee7540f036e20cda22f6197a1c29bce0 /include/linux/platform_data/cros_ec_chardev.h | |
| parent | 71cddb7097e2b0feb855d7fd7d59afd12cbee4bb (diff) | |
platform/chrome: cros_ec_chardev: Add a poll handler to receive MKBP events
Allow to poll on the cros_ec device to receive the MKBP events.
The /dev/cros_[ec|fp|..] file operations now implements the poll
operation. The userspace can now receive specific MKBP events by doing
the following:
- Open the /dev/cros_XX file.
- Call the CROS_EC_DEV_IOCEVENTMASK ioctl with the bitmap of the MKBP
events it wishes to receive as argument.
- Poll on the file descriptor.
- When it gets POLLIN, do a read on the file descriptor, the first
queued event will be returned (using the struct
ec_response_get_next_event format: one byte of event type, then
the payload).
The read() operation returns at most one event even if there are several
queued, and it might be truncated if the buffer is smaller than the
event (but the caller should know the maximum size of the events it is
reading).
read() used to return the EC version string, it still does it when no
event mask or an empty event is set for backward compatibility (despite
nobody really using this feature).
This will be used, for example, by the userspace daemon to receive and
treat the EC_MKBP_EVENT_FINGERPRINT sent by the FP MCU.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Diffstat (limited to 'include/linux/platform_data/cros_ec_chardev.h')
| -rw-r--r-- | include/linux/platform_data/cros_ec_chardev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/platform_data/cros_ec_chardev.h b/include/linux/platform_data/cros_ec_chardev.h index 973b2615aa02..7de8faaf77df 100644 --- a/include/linux/platform_data/cros_ec_chardev.h +++ b/include/linux/platform_data/cros_ec_chardev.h @@ -33,5 +33,6 @@ struct cros_ec_readmem { #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) +#define CROS_EC_DEV_IOCEVENTMASK _IO(CROS_EC_DEV_IOC, 2) #endif /* _CROS_EC_DEV_H_ */ |