// SPDX-License-Identifier: GPL-2.0-or-later /* * Streamzap Remote Control driver * * Copyright (c) 2005 Christoph Bartelmus * Copyright (c) 2010 Jarod Wilson * * This driver was based on the work of Greg Wickham and Adrian * Dewhurst. It was substantially rewritten to support correct signal * gaps and now maintains a delay buffer, which is used to present * consistent timing behaviour to user space applications. Without the * delay buffer an ugly hack would be required in lircd, which can * cause sluggish signal decoding in certain situations. * * Ported to in-kernel ir-core interface by Jarod Wilson * * This driver is based on the USB skeleton driver packaged with the * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com) */ #include #include #include #include #include #include #define DRIVER_NAME "streamzap" #define DRIVER_DESC "Streamzap Remote Control driver" #define USB_STREAMZAP_VENDOR_ID 0x0e9c #define USB_STREAMZAP_PRODUCT_ID 0x0000 /* table of devices that work with this driver */ static const struct usb_device_id streamzap_table[] = { /* Streamzap Remote Control */ { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) }, /* Terminating entry */ { } }; MODULE_DEVICE_TABLE(usb, streamzap_table); #define SZ_PULSE_MASK 0xf0 #define SZ_SPACE_MASK 0x0f #define SZ_TIMEOUT 0xff #define SZ_RESOLUTION 256 /* number of samples buffered */ #define SZ_BUF_LEN 128 enum StreamzapDecoderState { PulseSpace, FullPulse, FullSpace, IgnorePulse }; /* structure to hold our device specific stuff */ struct streamzap_ir { /* ir-core */ struct rc_dev *rdev; /* core device info */ struct device *dev; /* usb */ struct urb *urb_in; /* buffer & dma */ unsigned char *buf_in; dma_addr_t dma_in; unsigned int buf_in_len; /* track what state we're in */ enum StreamzapDecoderState decoder_state; char phys[64]; }; /* local function prototypes */ static int streamzap_probe(struct usb_interface *interface, const struct usb_device_id *id); static void streamzap_disconnect(struct usb_interface *interface); static void streamzap_callback(struct urb *urb); static int streamzap_suspend(struct usb_interface *intf, pm_message_t message); static int streamzap_resume(struct usb_interface *intf); /* usb specific object needed to register this driver with the usb subsystem */ static struct usb_driver streamzap_driver = { .name = DRIVER_NAME, .probe = streamzap_probe, .disconnect = streamzap_disconnect, .suspend = streamzap_suspend, .resume = streamzap_resume, .id_table = streamzap_table, }; static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir) { dev_dbg(sz->dev, "Storing %s with duration %u us\n", (rawir.pulse ? "pulse" : "space"), rawir.duration); ir_raw_event_store_with_filter(sz->rdev, &rawir); } static void sz_push_full_pulse(struct streamzap_ir *sz, unsigned char value) { struct ir_raw_event rawir = { .pulse = true, .duration = value * SZ_RESOLUTION + SZ_RESOLUTION / 2, }; sz_push(sz, rawir); } static void sz_push_half_pulse(struct streamzap_ir *sz, unsigned char value) { sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4); } static void sz_push_full_space(struct streamzap_ir *sz, unsigned char value) { struct ir_raw_event rawir = { .pulse = false, .duration = value * SZ_RESOLUTION + SZ_RESOLUTION / 2, }; sz_push(sz, rawir); } static void sz_push_half_space(struct streamzap_ir *sz, unsigned long value) { sz_push_full_space(sz, value & SZ_SPACE_MASK); } /* * streamzap_callback - usb IRQ handler callback * * This procedure is invoked on reception of data from * the usb remote. */ static void streamzap_callback(struct urb *urb) { struct streamzap_ir *sz; unsigned int i; int len; if (!urb) return; sz = urb->context; len = urb->actual_length; switch (urb->status) { case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* * this urb is terminated, clean up. * sz might already be invalid at this point */ dev_err(sz->dev, "urb terminated, status: %d\n", urb->status); return; default: break; } dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len); for (i = 0; i < len; i++) { dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n", i, (unsigned char)sz->buf_in[i]); switch (sz->decoder_state) { case PulseSpace: if ((sz->buf_in[i] & SZ_PULSE_MASK) == SZ_PULSE_MASK) { sz->decoder_state = FullPulse; continue; } else if ((sz->buf_in[i] & SZ_SPACE_MASK) == SZ_SPACE_MASK) { sz_push_half_pulse(sz, sz->buf_in[i]); sz->decoder_state = FullSpace; continue; } else { sz_push_half_pulse(sz, sz->buf_in[i]); sz_push_half_space(sz, sz->buf_in[i]); } break; case FullPulse: sz_push_full_pulse(sz, sz->buf_in[i]); sz->decoder_state = IgnorePulse; break; case FullSpace: if (sz->buf_in[i] == SZ_TIMEOUT) { struct ir_raw_event rawir = { .pulse = false, .duration = sz->rdev->timeout }; sz_push(sz, rawir); } else { sz_push_full_space(sz, sz->buf_in[i]); } sz->decoder_state = PulseSpace; break; case IgnorePulse: if ((sz->buf_in[i] & SZ_SPACE_MASK) == SZ_SPACE_MASK) { sz->decoder_state = FullSpace; continue; } sz_push_half_space(sz, sz->buf_in[i]); sz->decoder_state = PulseSpace; break; } } ir_raw_event_handle(sz->rdev); usb_submit_urb(urb, GFP_ATOMIC); } static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz, struct usb_device *usbdev) { struct rc_dev *rdev; struct device *dev = sz->dev; int ret; rdev = rc_allocate_device(RC_DRIVER_IR_RAW); if (!rdev) goto out; usb_make_path(usbdev, sz->phys, sizeof(sz->phys)); strlcat(sz->phys, "/input0", sizeof(sz->phys)); rdev->device_name = "Streamzap PC Remote Infrared Receiver"; rdev->input_phys = sz->phys; usb_to_input_id(usbdev, &rdev->input_id); rdev->dev.parent = dev; rdev->priv = sz; rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; rdev->driver_name = DRIVER_NAME; rdev->map_name = RC_MAP_STREAMZAP; rdev->rx_resolution = SZ_RESOLUTION; ret = rc_register_device(rdev); if (ret < 0) { dev_err(dev, "remote input device register failed\n"); goto out; } return rdev; out: rc_free_device(rdev); return NULL; } /* * streamzap_probe * * Called by usb-core to associated with a candidate device * On any failure the return value is the ERROR * On success return 0 */ static int streamzap_probe(struct usb_interface *intf, const struct usb_device_id *id) { struct usb_device *usbdev = interface_to_usbdev(intf); struct usb_endpoint_descriptor *endpoint; struct usb_host_interface *iface_host; struct streamzap_ir *sz = NULL; int retval = -ENOMEM; int pipe, maxp; /* Allocate space for device driver specific data */ sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL); if (!sz) return -ENOMEM; /* Check to ensure endpoint information matches requirements */ iface_host = intf->cur_altsetting; if (iface_host->desc.bNumEndpoints != 1) { dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n", __func__, iface_host->desc.bNumEndpoints); retval = -ENODEV; goto free_sz; } endpoint = &iface_host->endpoint[0].desc; if (!usb_endpoint_dir_in(endpoint)) { dev_err(&intf->dev, "%s: endpoint doesn't match input device 02%02x\n", __func__, endpoint->bEndpointAddress); retval = -ENODEV; goto free_sz; } if (!usb_endpoint_xfer_int(endpoint)) { dev_err(&intf->dev, "%s: endpoint attributes don't match xfer 02%02x\n", __func__, endpoint->bmAttributes); retval = -ENODEV; goto free_sz; } pipe = usb_rcvintpipe(usbdev, endpoint->bEndpointAddress); maxp = usb_maxpacket(usbdev, pipe); if (maxp == 0) { dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n", __func__); retval = -ENODEV; goto free_sz; } /* Allocate the USB buffer and IRQ URB */ sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in); if (!sz->buf_in) goto free_sz; sz->urb_in = usb_alloc_urb(0, GFP_KERNEL); if (!sz->urb_in) goto free_buf_in; sz->dev = &intf->dev; sz->buf_in_len = maxp; sz->rdev = streamzap_init_rc_dev(sz, usbdev); if (!sz->rdev) goto rc_dev_fail; sz->decoder_state = PulseSpace; /* FIXME: don't yet have a way to set this */ sz->rdev->timeout = SZ_TIMEOUT * SZ_RESOLUTION; #if 0 /* not yet supported, depends on patches from maxim */ /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */ sz->min_timeout = SZ_TIMEOUT * SZ_RESOLUTION; sz->max_timeout = SZ_TIMEOUT * SZ_RESOLUTION; #endif /* Complete final initialisations */ usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in, maxp, streamzap_callback, sz, endpoint->bInterval); sz->urb_in->transfer_dma = sz->dma_in; sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; usb_set_intfdata(intf, sz); if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) dev_err(sz->dev, "urb submit failed\n"); return 0; rc_dev_fail: usb_free_urb(sz->urb_in); free_buf_in: usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in); free_sz: kfree(sz); return retval; } /* * streamzap_disconnect * * Called by the usb core when the device is removed from the system. * * This routine guarantees that the driver will not submit any more urbs * by clearing dev->usbdev. It is also supposed to terminate any currently * active urbs. Unfortunately, usb_bulk_msg(), used in streamzap_read(), * does not provide any way to do this. */ static void streamzap_disconnect(struct usb_interface *interface) { struct streamzap_ir *sz = usb_get_intfdata(interface); struct usb_device *usbdev = interface_to_usbdev(interface); usb_set_intfdata(interface, NULL); if (!sz) return; rc_unregister_device(sz->rdev); usb_kill_urb(sz->urb_in); usb_free_urb(sz->urb_in); usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in); kfree(sz); } static int streamzap_suspend(struct usb_interface *intf, pm_message_t message) { struct streamzap_ir *sz = usb_get_intfdata(intf); usb_kill_urb(sz->urb_in); return 0; } static int streamzap_resume(struct usb_interface *intf) { struct streamzap_ir *sz = usb_get_intfdata(intf); if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) { dev_err(sz->dev, "Error submitting urb\n"); return -EIO; } return 0; } module_usb_driver(streamzap_driver); MODULE_AUTHOR("Jarod Wilson "); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL");