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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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/input.h>
#include <media/ir-core.h>
#define DRIVER_VERSION "1.60"
#define DRIVER_NAME "streamzap"
#define DRIVER_DESC "Streamzap Remote Control driver"
#ifdef CONFIG_USB_DEBUG
static int debug = 1;
#else
static int debug;
#endif
#define USB_STREAMZAP_VENDOR_ID 0x0e9c
#define USB_STREAMZAP_PRODUCT_ID 0x0000
/* table of devices that work with this driver */
static 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 STREAMZAP_PULSE_MASK 0xf0
#define STREAMZAP_SPACE_MASK 0x0f
#define STREAMZAP_TIMEOUT 0xff
#define STREAMZAP_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 ir_dev_props *props;
struct ir_raw_event rawir;
/* core device info */
struct device *dev;
struct input_dev *idev;
/* 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;
/* timer used to support delay buffering */
struct timer_list delay_timer;
bool timer_running;
spinlock_t timer_lock;
struct timer_list flush_timer;
bool flush;
/* delay buffer */
struct kfifo fifo;
bool fifo_initialized;
/* 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 */
struct timeval signal_last;
struct timeval 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 streamzap_stop_timer(struct streamzap_ir *sz)
{
unsigned long flags;
spin_lock_irqsave(&sz->timer_lock, flags);
if (sz->timer_running) {
sz->timer_running = false;
spin_unlock_irqrestore(&sz->timer_lock, flags);
del_timer_sync(&sz->delay_timer);
} else {
spin_unlock_irqrestore(&sz->timer_lock, flags);
}
}
static void streamzap_flush_timeout(unsigned long arg)
{
struct streamzap_ir *sz = (struct streamzap_ir *)arg;
dev_info(sz->dev, "%s: callback firing\n", __func__);
/* finally start accepting data */
sz->flush = false;
}
static void streamzap_delay_timeout(unsigned long arg)
{
struct streamzap_ir *sz = (struct streamzap_ir *)arg;
struct ir_raw_event rawir = { .pulse = false, .duration = 0 };
unsigned long flags;
int len, ret;
static unsigned long delay;
bool wake = false;
/* deliver data every 10 ms */
delay = msecs_to_jiffies(10);
spin_lock_irqsave(&sz->timer_lock, flags);
if (kfifo_len(&sz->fifo) > 0) {
ret = kfifo_out(&sz->fifo, &rawir, sizeof(rawir));
if (ret != sizeof(rawir))
dev_err(sz->dev, "Problem w/kfifo_out...\n");
ir_raw_event_store(sz->idev, &rawir);
wake = true;
}
len = kfifo_len(&sz->fifo);
if (len > 0) {
while ((len < SZ_BUF_LEN / 2) &&
(len < SZ_BUF_LEN * sizeof(int))) {
ret = kfifo_out(&sz->fifo, &rawir, sizeof(rawir));
if (ret != sizeof(rawir))
dev_err(sz->dev, "Problem w/kfifo_out...\n");
ir_raw_event_store(sz->idev, &rawir);
wake = true;
len = kfifo_len(&sz->fifo);
}
if (sz->timer_running)
mod_timer(&sz->delay_timer, jiffies + delay);
} else {
sz->timer_running = false;
}
if (wake)
ir_raw_event_handle(sz->idev);
spin_unlock_irqrestore(&sz->timer_lock, flags);
}
static void streamzap_flush_delay_buffer(struct streamzap_ir *sz)
{
struct ir_raw_event rawir = { .pulse = false, .duration = 0 };
bool wake = false;
int ret;
while (kfifo_len(&sz->fifo)
|