200 lines
4.3 KiB
C
200 lines
4.3 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 250000
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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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u8 ir_buf[8];
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char phys[64];
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};
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/*
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* ffs/find_next_bit() searches in the wrong direction, so open-code our own.
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*/
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static inline int is_bit_set(const u8 *buf, int bit)
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{
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return buf[bit / 8] & (0x80 >> (bit & 7));
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}
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static void imon_ir_data(struct imon *imon)
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{
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DEFINE_IR_RAW_EVENT(rawir);
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int offset = 0, size = 5 * 8;
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int bit;
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dev_dbg(imon->dev, "data: %*ph", 8, imon->ir_buf);
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while (offset < size) {
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bit = offset;
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while (!is_bit_set(imon->ir_buf, bit) && bit < size)
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bit++;
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dev_dbg(imon->dev, "pulse: %d bits", bit - offset);
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if (bit > offset) {
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rawir.pulse = true;
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rawir.duration = (bit - offset) * BIT_DURATION;
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ir_raw_event_store_with_filter(imon->rcdev, &rawir);
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}
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if (bit >= size)
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break;
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offset = bit;
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while (is_bit_set(imon->ir_buf, bit) && bit < size)
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bit++;
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dev_dbg(imon->dev, "space: %d bits", bit - offset);
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rawir.pulse = false;
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rawir.duration = (bit - offset) * 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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if (imon->ir_buf[7] == 0x0a) {
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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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if (imon->ir_buf[7] != 0xff)
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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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