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path: root/drivers/media/rc/streamzap.c
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-rw-r--r--drivers/media/rc/streamzap.c507
1 files changed, 507 insertions, 0 deletions
diff --git a/drivers/media/rc/streamzap.c b/drivers/media/rc/streamzap.c
new file mode 100644
index 000000000..c9a70fda8
--- /dev/null
+++ b/drivers/media/rc/streamzap.c
@@ -0,0 +1,507 @@
+/*
+ * 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)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ktime.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <media/rc-core.h>
+
+#define DRIVER_VERSION "1.61"
+#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 usb_device *usbdev;
+ struct usb_interface *interface;
+ struct usb_endpoint_descriptor *endpoint;
+ 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;
+ /* tracks whether we are currently receiving some signal */
+ bool idle;
+ /* sum of signal lengths received since signal start */
+ unsigned long sum;
+ /* start time of signal; necessary for gap tracking */
+ ktime_t signal_last;
+ ktime_t signal_start;
+ bool timeout_enabled;
+
+ char name[128];
+ 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)
+{
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ if (sz->idle) {
+ int delta;
+
+ sz->signal_last = sz->signal_start;
+ sz->signal_start = ktime_get_real();
+
+ delta = ktime_us_delta(sz->signal_start, sz->signal_last);
+ rawir.pulse = false;
+ if (delta > (15 * USEC_PER_SEC)) {
+ /* really long time */
+ rawir.duration = IR_MAX_DURATION;
+ } else {
+ rawir.duration = delta;
+ rawir.duration -= sz->sum;
+ rawir.duration = US_TO_NS(rawir.duration);
+ rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
+ IR_MAX_DURATION : rawir.duration;
+ }
+ sz_push(sz, rawir);
+
+ sz->idle = false;
+ sz->sum = 0;
+ }
+
+ rawir.pulse = true;
+ rawir.duration = ((int) value) * SZ_RESOLUTION;
+ rawir.duration += SZ_RESOLUTION / 2;
+ sz->sum += rawir.duration;
+ rawir.duration = US_TO_NS(rawir.duration);
+ rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
+ IR_MAX_DURATION : rawir.duration;
+ 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)
+{
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ rawir.pulse = false;
+ rawir.duration = ((int) value) * SZ_RESOLUTION;
+ rawir.duration += SZ_RESOLUTION / 2;
+ sz->sum += rawir.duration;
+ rawir.duration = US_TO_NS(rawir.duration);
+ 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) {
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ rawir.pulse = false;
+ rawir.duration = sz->rdev->timeout;
+ sz->idle = true;
+ if (sz->timeout_enabled)
+ sz_push(sz, rawir);
+ ir_raw_event_handle(sz->rdev);
+ ir_raw_event_reset(sz->rdev);
+ } 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);
+
+ return;
+}
+
+static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
+{
+ struct rc_dev *rdev;
+ struct device *dev = sz->dev;
+ int ret;
+
+ rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
+ if (!rdev) {
+ dev_err(dev, "remote dev allocation failed\n");
+ goto out;
+ }
+
+ snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared Receiver (%04x:%04x)",
+ le16_to_cpu(sz->usbdev->descriptor.idVendor),
+ le16_to_cpu(sz->usbdev->descriptor.idProduct));
+ usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
+ strlcat(sz->phys, "/input0", sizeof(sz->phys));
+
+ rdev->device_name = sz->name;
+ rdev->input_phys = sz->phys;
+ usb_to_input_id(sz->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;
+
+ 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_host_interface *iface_host;
+ struct streamzap_ir *sz = NULL;
+ char buf[63], name[128] = "";
+ 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;
+
+ sz->usbdev = usbdev;
+ sz->interface = intf;
+
+ /* 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;
+ }
+
+ sz->endpoint = &(iface_host->endpoint[0].desc);
+ if (!usb_endpoint_dir_in(sz->endpoint)) {
+ dev_err(&intf->dev, "%s: endpoint doesn't match input device 02%02x\n",
+ __func__, sz->endpoint->bEndpointAddress);
+ retval = -ENODEV;
+ goto free_sz;
+ }
+
+ if (!usb_endpoint_xfer_int(sz->endpoint)) {
+ dev_err(&intf->dev, "%s: endpoint attributes don't match xfer 02%02x\n",
+ __func__, sz->endpoint->bmAttributes);
+ retval = -ENODEV;
+ goto free_sz;
+ }
+
+ pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
+ maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(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;
+
+ if (usbdev->descriptor.iManufacturer
+ && usb_string(usbdev, usbdev->descriptor.iManufacturer,
+ buf, sizeof(buf)) > 0)
+ strlcpy(name, buf, sizeof(name));
+
+ if (usbdev->descriptor.iProduct
+ && usb_string(usbdev, usbdev->descriptor.iProduct,
+ buf, sizeof(buf)) > 0)
+ snprintf(name + strlen(name), sizeof(name) - strlen(name),
+ " %s", buf);
+
+ sz->rdev = streamzap_init_rc_dev(sz);
+ if (!sz->rdev)
+ goto rc_dev_fail;
+
+ sz->idle = true;
+ sz->decoder_state = PulseSpace;
+ /* FIXME: don't yet have a way to set this */
+ sz->timeout_enabled = true;
+ sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
+ IR_MAX_DURATION) | 0x03000000);
+ #if 0
+ /* not yet supported, depends on patches from maxim */
+ /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
+ sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
+ sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
+ #endif
+
+ sz->signal_start = ktime_get_real();
+
+ /* Complete final initialisations */
+ usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
+ maxp, (usb_complete_t)streamzap_callback,
+ sz, 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");
+
+ dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
+ usbdev->bus->busnum, usbdev->devnum);
+
+ 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;
+
+ sz->usbdev = NULL;
+ 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 <jarod@wilsonet.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 03:15:35 +0000