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|
/*
* 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)
{
struct 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)
{
struct 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) {
struct ir_raw_event rawir = {
.pulse = false,
.duration = sz->rdev->timeout
};
sz->idle = true;
if (sz->timeout_enabled)
sz_push(sz, rawir);
ir_raw_even
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