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209 lines
4.7 KiB
209 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// Copyright (C) 2018 Sean Young <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DEVICE_TABLE(usb, imon_table);
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