On 05/10/17 10:45, Sean Young wrote:
> If you want to poll for both decoded scancodes and raw IR, then this
> ioctl will help you.
I don't get the point of this. You can be in one mode at a time anyway,
so why not just poll for the current mode?
>
> int fd = open("/dev/lirc0", O_RDONLY | O_NONBLOCK);
>
> for (;;) {
> unsigned mode = LIRC_MODE_SCANCODE | LIRC_MODE_MODE2;
> ioctl(fd, LIRC_SET_POLL_MODE, &mode);
> poll(&((struct pollfd){ .fd = fd, .events = POLLIN }), 1, -1);
> mode = LIRC_MODE_SCANCODE;
> ioctl(fd, LIRC_SET_REC_MODE, &mode);
Hold on, in a comment below I read that rec_mode stands for 'recording mode'.
Is that right, or should it be 'receive mode'?
> struct lirc_scancode sc;
> if (read(fd, &sc, sizeof(sc)) == sizeof(sc)) {
> printf("scancode protocol:%d scancode:%llx\n",
> sc.rc_proto, sc.scancode);
> }
> mode = LIRC_MODE_MODE2;
> ioctl(fd, LIRC_SET_REC_MODE, &mode);
> unsigned sample;
> if (read(fd, &sample, sizeof(sample)) == sizeof(sample)) {
> if (LIRC_IS_SPACE(sample))
> printf("space %u\n", LIRC_VAL(sample)));
> if (LIRC_IS_PULSE(sample))
> printf("pulse %u\n", LIRC_VAL(sample)));
> }
> }
>
> Note that LIRC_SET_REC_MODE will also affect the poll mode, so you
> must set it again before calling poll.
>
> Signed-off-by: Sean Young <s...@mess.org>
> ---
> Documentation/media/uapi/rc/lirc-func.rst | 1 +
> Documentation/media/uapi/rc/lirc-set-poll-mode.rst | 45
> ++++++++++++++++++++++
> drivers/media/rc/ir-lirc-codec.c | 19 +++++++--
> drivers/media/rc/lirc_dev.c | 1 +
> include/media/rc-core.h | 3 ++
> 5 files changed, 65 insertions(+), 4 deletions(-)
> create mode 100644 Documentation/media/uapi/rc/lirc-set-poll-mode.rst
>
> diff --git a/Documentation/media/uapi/rc/lirc-func.rst
> b/Documentation/media/uapi/rc/lirc-func.rst
> index ddb4620de294..a09fb03f6722 100644
> --- a/Documentation/media/uapi/rc/lirc-func.rst
> +++ b/Documentation/media/uapi/rc/lirc-func.rst
> @@ -25,3 +25,4 @@ LIRC Function Reference
> lirc-set-rec-timeout-reports
> lirc-set-measure-carrier-mode
> lirc-set-wideband-receiver
> + lirc-set-poll-mode
> diff --git a/Documentation/media/uapi/rc/lirc-set-poll-mode.rst
> b/Documentation/media/uapi/rc/lirc-set-poll-mode.rst
> new file mode 100644
> index 000000000000..ce5043e8acba
> --- /dev/null
> +++ b/Documentation/media/uapi/rc/lirc-set-poll-mode.rst
> @@ -0,0 +1,45 @@
> +.. -*- coding: utf-8; mode: rst -*-
> +
> +.. _lirc_set_poll_mode:
> +
> +**********************************************
> +ioctls LIRC_SET_POLL_MODE
> +**********************************************
> +
> +Name
> +====
> +
> +LIRC_SET_POLL_MODE - Set LIRC modes to use for poll
> +
> +Synopsis
> +========
> +
> +.. c:function:: int ioctl( int fd, LIRC_SET_POLL_MODE, __u32 modes)
> + :name: LIRC_SET_POLL_MODE
> +
> +Arguments
> +=========
> +
> +``fd``
> + File descriptor returned by open().
> +
> +``modes``
> + Bitmask with enabled poll lirc modes
> +
> +Description
> +===========
> +
> +Set lirc modes for which read readiness is reported by poll. Only
> +:ref:`LIRC_MODE_MODE2 <lirc-mode-mode2>` and
> +:ref:`LIRC_MODE_SCANCODE <lirc-mode-scancode>` are supported. Poll
> +can report read readiness for both modes if you bitwise or them together.
> +Use :ref:`lirc_get_features` to find out which modes the driver supports.
> +
> +Note that using :ref:`lirc_set_rec_mode` resets the poll mode.
> +
> +Return Value
> +============
> +
> +On success 0 is returned, on error -1 and the ``errno`` variable is set
> +appropriately. The generic error codes are described at the
> +:ref:`Generic Error Codes <gen-errors>` chapter.
> diff --git a/drivers/media/rc/ir-lirc-codec.c
> b/drivers/media/rc/ir-lirc-codec.c
> index 2544ddc078ca..1f1811c080af 100644
> --- a/drivers/media/rc/ir-lirc-codec.c
> +++ b/drivers/media/rc/ir-lirc-codec.c
> @@ -353,6 +353,17 @@ static long ir_lirc_ioctl(struct file *filep, unsigned
> int cmd,
> return -EINVAL;
>
> dev->rec_mode = val;
> + dev->poll_mode = val;
> + return 0;
> +
> + case LIRC_SET_POLL_MODE:
> + if (dev->driver_type == RC_DRIVER_IR_RAW_TX)
> + return -ENOTTY;
> +
> + if (val & ~(LIRC_MODE_MODE2 | LIRC_MODE_SCANCODE))
> + return -EINVAL;
> +
> + dev->poll_mode = val;
> return 0;
>
> case LIRC_GET_SEND_MODE:
> @@ -495,13 +506,13 @@ static unsigned int ir_lirc_poll(struct file *file,
> if (!rcdev->registered) {
> events = POLLHUP | POLLERR;
> } else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) {
> - if (rcdev->rec_mode == LIRC_MODE_SCANCODE &&
> + if ((rcdev->poll_mode & LIRC_MODE_SCANCODE) &&
> !kfifo_is_empty(&rcdev->scancodes))
> - events = POLLIN | POLLRDNORM;
> + events |= POLLIN | POLLRDNORM;
>
> - if (rcdev->rec_mode == LIRC_MODE_MODE2 &&
> + if ((rcdev->poll_mode & LIRC_MODE_MODE2) &&
> !kfifo_is_empty(&rcdev->rawir))
> - events = POLLIN | POLLRDNORM;
> + events |= POLLIN | POLLRDNORM;
> }
>
> return events;
> diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
> index 35d6072b12b2..aee7cbb04439 100644
> --- a/drivers/media/rc/lirc_dev.c
> +++ b/drivers/media/rc/lirc_dev.c
> @@ -62,6 +62,7 @@ int ir_lirc_register(struct rc_dev *dev)
> dev->send_mode = LIRC_MODE_PULSE;
>
> dev->rec_mode = LIRC_MODE_MODE2;
> + dev->poll_mode = LIRC_MODE_MODE2;
>
> if (dev->driver_type == RC_DRIVER_IR_RAW) {
> if (kfifo_alloc(&dev->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL))
> diff --git a/include/media/rc-core.h b/include/media/rc-core.h
> index 86f62e75dcab..da9624b2cc1a 100644
> --- a/include/media/rc-core.h
> +++ b/include/media/rc-core.h
> @@ -132,6 +132,8 @@ enum rc_filter_type {
> * LIRC_MODE_PULSE
> * @rec_mode: lirc mode for recording, either LIRC_MODE_SCANCODE or
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ here is the 'recording' comment.
> * LIRC_MODE_MODE2
> + * @poll_mode: lirc mode used for polling, can poll for both
> LIRC_MODE_SCANCODE
> + * and LIRC_MODE_MODE2
> * @registered: set to true by rc_register_device(), false by
> * rc_unregister_device
> * @change_protocol: allow changing the protocol used on hardware decoders
> @@ -208,6 +210,7 @@ struct rc_dev {
> wait_queue_head_t wait_poll;
> u8 send_mode;
> u8 rec_mode;
> + u8 poll_mode;
> #endif
> bool registered;
> int (*change_protocol)(struct rc_dev *dev,
> u64 *rc_proto);
>
Regards,
Hans
