1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/media/rc/streamzap.c b/drivers/media/rc/streamzap.c
new file mode 100644
index 0000000000..9b209e687f
--- /dev/null
+++ b/drivers/media/rc/streamzap.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Streamzap Remote Control driver
+ *
+ * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
+ * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
+ *
+ * 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 <linux/device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <media/rc-core.h>
+
+#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_NOIO)) {
+		dev_err(sz->dev, "Error submitting urb\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+module_usb_driver(streamzap_driver);
+
+MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");