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528222d853
rc-core kapi uses nanoseconds for infrared durations for receiving, and microseconds for sending. The uapi already uses microseconds for both, so this patch does not change the uapi. Infrared durations do not need nanosecond resolution. IR protocols do not have durations shorter than about 100 microseconds. Some IR hardware offers 250 microseconds resolution, which is sufficient for most protocols. Better hardware has 50 microsecond resolution and is enough for every protocol I am aware off. Unify on microseconds everywhere. This simplifies the code since less conversion between microseconds and nanoseconds needs to be done. This affects: - rx_resolution member of struct rc_dev - timeout member of struct rc_dev - duration member in struct ir_raw_event Cc: "Bruno Prémont" <bonbons@linux-vserver.org> Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Patrick Lerda <patrick9876@free.fr> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Cc: Jerome Brunet <jbrunet@baylibre.com> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Sean Wang <sean.wang@mediatek.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Chen-Yu Tsai <wens@csie.org> Cc: "David Härdeman" <david@hardeman.nu> Cc: Benjamin Valentin <benpicco@googlemail.com> Cc: Antti Palosaari <crope@iki.fi> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
210 lines
4.7 KiB
C
210 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Copyright (C) 2018 Sean Young <sean@mess.org>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include <media/rc-core.h>
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/* Each bit is 250us */
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#define BIT_DURATION 250
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struct imon {
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struct device *dev;
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struct urb *ir_urb;
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struct rc_dev *rcdev;
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__be64 ir_buf;
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char phys[64];
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};
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/*
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* The first 5 bytes of data represent IR pulse or space. Each bit, starting
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* from highest bit in the first byte, represents 250µs of data. It is 1
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* for space and 0 for pulse.
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*
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* The station sends 10 packets, and the 7th byte will be number 1 to 10, so
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* when we receive 10 we assume all the data has arrived.
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*/
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static void imon_ir_data(struct imon *imon)
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{
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struct ir_raw_event rawir = {};
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u64 data = be64_to_cpu(imon->ir_buf);
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u8 packet_no = data & 0xff;
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int offset = 40;
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int bit;
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if (packet_no == 0xff)
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return;
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dev_dbg(imon->dev, "data: %*ph", 8, &imon->ir_buf);
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/*
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* Only the first 5 bytes contain IR data. Right shift so we move
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* the IR bits to the lower 40 bits.
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*/
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data >>= 24;
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do {
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/*
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* Find highest set bit which is less or equal to offset
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*
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* offset is the bit above (base 0) where we start looking.
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*
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* data & (BIT_ULL(offset) - 1) masks off any unwanted bits,
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* so we have just bits less than offset.
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*
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* fls will tell us the highest bit set plus 1 (or 0 if no
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* bits are set).
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*/
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rawir.pulse = !rawir.pulse;
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bit = fls64(data & (BIT_ULL(offset) - 1));
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if (bit < offset) {
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dev_dbg(imon->dev, "%s: %d bits",
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rawir.pulse ? "pulse" : "space", offset - bit);
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rawir.duration = (offset - bit) * BIT_DURATION;
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ir_raw_event_store_with_filter(imon->rcdev, &rawir);
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offset = bit;
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}
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data = ~data;
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} while (offset > 0);
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if (packet_no == 0x0a && !imon->rcdev->idle) {
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ir_raw_event_set_idle(imon->rcdev, true);
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ir_raw_event_handle(imon->rcdev);
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}
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}
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static void imon_ir_rx(struct urb *urb)
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{
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struct imon *imon = urb->context;
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int ret;
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switch (urb->status) {
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case 0:
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imon_ir_data(imon);
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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usb_unlink_urb(urb);
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return;
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case -EPIPE:
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default:
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dev_dbg(imon->dev, "error: urb status = %d", urb->status);
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break;
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}
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ret = usb_submit_urb(urb, GFP_ATOMIC);
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if (ret && ret != -ENODEV)
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dev_warn(imon->dev, "failed to resubmit urb: %d", ret);
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}
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static int imon_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_endpoint_descriptor *ir_ep = NULL;
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struct usb_host_interface *idesc;
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struct usb_device *udev;
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struct rc_dev *rcdev;
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struct imon *imon;
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int i, ret;
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udev = interface_to_usbdev(intf);
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idesc = intf->cur_altsetting;
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for (i = 0; i < idesc->desc.bNumEndpoints; i++) {
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struct usb_endpoint_descriptor *ep = &idesc->endpoint[i].desc;
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if (usb_endpoint_is_int_in(ep)) {
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ir_ep = ep;
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break;
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}
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}
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if (!ir_ep) {
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dev_err(&intf->dev, "IR endpoint missing");
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return -ENODEV;
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}
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imon = devm_kmalloc(&intf->dev, sizeof(*imon), GFP_KERNEL);
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if (!imon)
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return -ENOMEM;
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imon->ir_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!imon->ir_urb)
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return -ENOMEM;
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imon->dev = &intf->dev;
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usb_fill_int_urb(imon->ir_urb, udev,
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usb_rcvintpipe(udev, ir_ep->bEndpointAddress),
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&imon->ir_buf, sizeof(imon->ir_buf),
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imon_ir_rx, imon, ir_ep->bInterval);
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rcdev = devm_rc_allocate_device(&intf->dev, RC_DRIVER_IR_RAW);
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if (!rcdev) {
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ret = -ENOMEM;
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goto free_urb;
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}
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usb_make_path(udev, imon->phys, sizeof(imon->phys));
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rcdev->device_name = "iMON Station";
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rcdev->driver_name = KBUILD_MODNAME;
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rcdev->input_phys = imon->phys;
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usb_to_input_id(udev, &rcdev->input_id);
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rcdev->dev.parent = &intf->dev;
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rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
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rcdev->map_name = RC_MAP_IMON_RSC;
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rcdev->rx_resolution = BIT_DURATION;
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rcdev->priv = imon;
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ret = devm_rc_register_device(&intf->dev, rcdev);
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if (ret)
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goto free_urb;
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imon->rcdev = rcdev;
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ret = usb_submit_urb(imon->ir_urb, GFP_KERNEL);
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if (ret)
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goto free_urb;
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usb_set_intfdata(intf, imon);
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return 0;
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free_urb:
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usb_free_urb(imon->ir_urb);
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return ret;
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}
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static void imon_disconnect(struct usb_interface *intf)
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{
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struct imon *imon = usb_get_intfdata(intf);
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usb_kill_urb(imon->ir_urb);
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usb_free_urb(imon->ir_urb);
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}
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static const struct usb_device_id imon_table[] = {
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/* SoundGraph iMON (IR only) -- sg_imon.inf */
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{ USB_DEVICE(0x04e8, 0xff30) },
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{}
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};
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static struct usb_driver imon_driver = {
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.name = KBUILD_MODNAME,
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.probe = imon_probe,
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.disconnect = imon_disconnect,
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.id_table = imon_table
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};
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module_usb_driver(imon_driver);
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MODULE_DESCRIPTION("Early raw iMON IR devices");
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MODULE_AUTHOR("Sean Young <sean@mess.org>");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(usb, imon_table);
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