linux-imx
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// SPDX-License-Identifier: GPL-2.0+//// Copyright (C) 2018 Sean Young <sean@mess.org>/* Each bit is 250us */struct imon { struct device *dev; struct urb *ir_urb; struct rc_dev *rcdev; u8 ir_buf[8] __aligned(__alignof__(u64)); char phys[64];};/* * The first 5 bytes of data represent IR pulse or space. Each bit, starting * from highest bit in the first byte, represents 250µs of data. It is 1 * for space and 0 for pulse. * * The station sends 10 packets, and the 7th byte will be number 1 to 10, so * when we receive 10 we assume all the data has arrived. */static void imon_ir_data(struct imon *imon){ struct ir_raw_event rawir = {}; u64 d = be64_to_cpup((__be64 *)imon->ir_buf) >> 24; int offset = 40; int bit; dev_dbg(imon->dev, "data: %*ph", 8, imon->ir_buf); do { bit = fls64(d & (BIT_ULL(offset) - 1)); if (bit < offset) { dev_dbg(imon->dev, "pulse: %d bits", offset - bit); rawir.pulse = true; rawir.duration = (offset - bit) * BIT_DURATION; ir_raw_event_store_with_filter(imon->rcdev, &rawir); if (bit == 0) break; offset = bit; } bit = fls64(~d & (BIT_ULL(offset) - 1)); dev_dbg(imon->dev, "space: %d bits", offset - bit); rawir.pulse = false; rawir.duration = (offset - bit) * BIT_DURATION; ir_raw_event_store_with_filter(imon->rcdev, &rawir); offset = bit; } while (offset > 0); if (imon->ir_buf[7] == 0x0a) { ir_raw_event_set_idle(imon->rcdev, true); ir_raw_event_handle(imon->rcdev); }}static void imon_ir_rx(struct urb *urb){ struct imon *imon = urb->context; int ret; switch (urb->status) { case 0: if (imon->ir_buf[7] != 0xff) imon_ir_data(imon); break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: usb_unlink_urb(urb); return; case -EPIPE: default: dev_dbg(imon->dev, "error: urb status = %d", urb->status); break; } ret = usb_submit_urb(urb, GFP_ATOMIC); if (ret && ret != -ENODEV) dev_warn(imon->dev, "failed to resubmit urb: %d", ret);}