I successfully compiled s2-liplianin drivers, and they are working fine. That's how I did that (under Ubuntu 11.10):
0) Drivers need i2c-core module to work properly. The backfire's kmod-i2c-core package doesn't seem to work correctly, as reported here. The solution is to change line 38 of i2c-core.c from:
to
#include "i2c-boardinfo.c"
That produces the working i2c-core module.
1) Get s2-liplianin source code:
cd ~
hg clone http://mercurial.intuxication.org/hg/s2-liplianin/
cd s2-liplianin
2) Create symlink for the kernel headers (previously I compiled Backfire 10.03.1 in directory ~/OpenWrt/backfire_10.03.1 ):
cd /lib/modules
mkdir 2.6.32.27
sudo ln -s ~/OpenWrt/backfire_10.03.1/build_dir/linux-brcm47xx/linux-2.6.32.27 build
3) Configure drivers for your device:
make KERNELRELEASE=2.6.32.27 menuconfig
For example, for my TBS Q-Box device I chose the following:
<M>Multimedia support
<M> DVB for Linux
[*] Load and attach frontend and tuner driver modules as needed
[*] Customize analog and hybrid tuner modules to build ---> ?????? ?????? ?? ???????
(8) Maximum number of DVB/ATSC adapters
[*] Dynamic DVB minor allocation
[*] DVB/ATSC adapters --->
<M> Support for various USB DVB devices
[*] Enable debug support for all DVB-USB devices
<M> DvbWorld & TeVii DVB-S/S2 USB2.0 support
[*] Customize the frontend modules to build
Customize DVB frontends --->
<M> ST STV0288 based
<M> ST STB6000 silicon tuner
4) I wrote a simple script openwrt-make.sh that just passes compiler options to the original makefile:
#!/bin/sh
CROSS_COMPILE=mipsel-openwrt-linux-uclibc-
CC=$CROSS_COMPILE"gcc"
LD=$CROSS_COMPILE"ld"
AR=$CROSS_COMPILE"ar"
AS=$CROSS_COMPILE"as"
OBJCOPY=$CROSS_COMPILE"objcopy"
OBJDUMP=$CROSS_COMPILE"objdump"
RANLIB=$CROSS_COMPILE"ranlib"
OPENWRT_DIR=/home/ael/OpenWrt/backfire_10.03.1
OPENWRT_TOOLCHAIN_DIR=$OPENWRT_DIR/staging_dir/toolchain-mipsel_gcc-4.3.3+cs_uClibc-0.9.30.1
export PATH="$OPENWRT_TOOLCHAIN_DIR/usr/bin/:$PATH"
KERNELRELEASE=2.6.32.27
CFLAGS="-D__KERNEL__ -DMODULE -pipe -mips32 -mtune=mips32 -funit-at-a-time -fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 -mno-abicalls -fno-pic -ffunction-sections -mlong-calls -mabi=32 -march=mips32 -fno-builtin-strpbrk -fno-builtin-sprintf -fno-delete-null-pointer-checks -finline-limit=100000 -Os -Wa,-mips32 -Wa,-32 -Wa,-march=mips32 -Wa,--trap"
make CC="$CC" LD="$LD" AR="$AR" AS="$AS" OBJCOPY="$OBJCOPY" OBJDUMP="$OBJDUMP" RANLIB="$RANLIB" KERNELRELEASE="$KERNELRELEASE" CFLAGS="$CFLAGS" ARCH="mips"
Maybe the options in CFLAGS must be modified, but the exact script worked for me.
5) For correct compilation, I had to modify s2-liplianin sources a bit. The problem is that sources are not always backward compatible with old kernel versions, such as 2.6.32. First issue is in module lirc_dev, that uses kernel header kfifo.h, which has changed in 2.6.33 kernels (old version[url]and [url=http://lxr.free-electrons.com/source/include/linux/kfifo.h?v=2.6.33]new version), and assuems that the newer version is used. I corrected this in the following way: I downloaded original q-box drivers, found that they use the same lirc_dev module, but in lirc_dev.h file there are many #ifdef's that separate old and new kernel versions. So I just replaces lirc_dev.h file in s2-liplianin subfolders
v4l/
linux/include/media
linux/drivers/media/IR/
with the better file lirc_dev.h. I don't know if it's possible to attach file to the message, so I'll just post the working lirc_dev.h file:
/*
* LIRC base driver
*
* by Artur Lipowski <alipowski@interia.pl>
* This code is licensed under GNU GPL
*
*/
#ifndef _LINUX_LIRC_DEV_H
#define _LINUX_LIRC_DEV_H
#define MAX_IRCTL_DEVICES 8
#define BUFLEN 16
#define mod(n, div) ((n) % (div))
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/poll.h>
#include <linux/kfifo.h>
#include <media/lirc.h>
struct lirc_buffer {
wait_queue_head_t wait_poll;
spinlock_t fifo_lock;
unsigned int chunk_size;
unsigned int size; /* in chunks */
/* Using chunks instead of bytes pretends to simplify boundary checking
* And should allow for some performance fine tunning later */
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
struct kfifo *fifo;
#else
struct kfifo fifo;
#endif
u8 fifo_initialized;
};
static inline void lirc_buffer_clear(struct lirc_buffer *buf)
{
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
if (buf->fifo)
kfifo_reset(buf->fifo);
#else
unsigned long flags;
if (buf->fifo_initialized) {
spin_lock_irqsave(&buf->fifo_lock, flags);
kfifo_reset(&buf->fifo);
spin_unlock_irqrestore(&buf->fifo_lock, flags);
}
#endif
else
WARN(1, "calling %s on an uninitialized lirc_buffer\n",
__func__);
}
static inline int lirc_buffer_init(struct lirc_buffer *buf,
unsigned int chunk_size,
unsigned int size)
{
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,32)
int ret;
#endif
init_waitqueue_head(&buf->wait_poll);
spin_lock_init(&buf->fifo_lock);
buf->chunk_size = chunk_size;
buf->size = size;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
buf->fifo = kfifo_alloc(size * chunk_size, GFP_KERNEL,
&buf->fifo_lock);
if (IS_ERR(buf->fifo))
return IS_ERR(buf->fifo);
#else
ret = kfifo_alloc(&buf->fifo, size * chunk_size, GFP_KERNEL);
if (ret == 0)
buf->fifo_initialized = 1;
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
return 0;
#else
return ret;
#endif
}
static inline void lirc_buffer_free(struct lirc_buffer *buf)
{
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
if (buf->fifo)
kfifo_free(buf->fifo);
#else
if (buf->fifo_initialized) {
kfifo_free(&buf->fifo);
buf->fifo_initialized = 0;
}
#endif
else
WARN(1, "calling %s on an uninitialized lirc_buffer\n",
__func__);
}
static inline int lirc_buffer_len(struct lirc_buffer *buf)
{
int len;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
len = kfifo_len(buf->fifo);
#else
unsigned long flags;
spin_lock_irqsave(&buf->fifo_lock, flags);
len = kfifo_len(&buf->fifo);
spin_unlock_irqrestore(&buf->fifo_lock, flags);
#endif
return len;
}
static inline int lirc_buffer_full(struct lirc_buffer *buf)
{
return lirc_buffer_len(buf) == buf->size * buf->chunk_size;
}
static inline int lirc_buffer_empty(struct lirc_buffer *buf)
{
return !lirc_buffer_len(buf);
}
static inline int lirc_buffer_available(struct lirc_buffer *buf)
{
return buf->size - (lirc_buffer_len(buf) / buf->chunk_size);
}
static inline unsigned int lirc_buffer_read(struct lirc_buffer *buf,
unsigned char *dest)
{
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
if (lirc_buffer_len(buf) >= buf->chunk_size)
kfifo_get(buf->fifo, dest, buf->chunk_size);
return 0;
#else
unsigned int ret = 0;
if (lirc_buffer_len(buf) >= buf->chunk_size)
ret = kfifo_out_locked(&buf->fifo, dest, buf->chunk_size,
&buf->fifo_lock);
return ret;
#endif
}
static inline unsigned int lirc_buffer_write(struct lirc_buffer *buf,
unsigned char *orig)
{
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32)
kfifo_put(buf->fifo, orig, buf->chunk_size);
return 0;
#else
unsigned int ret;
ret = kfifo_in_locked(&buf->fifo, orig, buf->chunk_size,
&buf->fifo_lock);
return ret;
#endif
}
struct lirc_driver {
char name[40];
int minor;
__u32 code_length;
unsigned int buffer_size; /* in chunks holding one code each */
int sample_rate;
__u32 features;
unsigned int chunk_size;
void *data;
int min_timeout;
int max_timeout;
int (*add_to_buf) (void *data, struct lirc_buffer *buf);
struct lirc_buffer *rbuf;
int (*set_use_inc) (void *data);
void (*set_use_dec) (void *data);
const struct file_operations *fops;
struct device *dev;
struct module *owner;
};
/* name:
* this string will be used for logs
*
* minor:
* indicates minor device (/dev/lirc) number for registered driver
* if caller fills it with negative value, then the first free minor
* number will be used (if available)
*
* code_length:
* length of the remote control key code expressed in bits
*
* sample_rate:
*
* data:
* it may point to any driver data and this pointer will be passed to
* all callback functions
*
* add_to_buf:
* add_to_buf will be called after specified period of the time or
* triggered by the external event, this behavior depends on value of
* the sample_rate this function will be called in user context. This
* routine should return 0 if data was added to the buffer and
* -ENODATA if none was available. This should add some number of bits
* evenly divisible by code_length to the buffer
*
* rbuf:
* if not NULL, it will be used as a read buffer, you will have to
* write to the buffer by other means, like irq's (see also
* lirc_serial.c).
*
* set_use_inc:
* set_use_inc will be called after device is opened
*
* set_use_dec:
* set_use_dec will be called after device is closed
*
* fops:
* file_operations for drivers which don't fit the current driver model.
*
* Some ioctl's can be directly handled by lirc_dev if the driver's
* ioctl function is NULL or if it returns -ENOIOCTLCMD (see also
* lirc_serial.c).
*
* owner:
* the module owning this struct
*
*/
/* following functions can be called ONLY from user context
*
* returns negative value on error or minor number
* of the registered device if success
* contents of the structure pointed by p is copied
*/
extern int lirc_register_driver(struct lirc_driver *d);
/* returns negative value on error or 0 if success
*/
extern int lirc_unregister_driver(int minor);
/* Returns the private data stored in the lirc_driver
* associated with the given device file pointer.
*/
void *lirc_get_pdata(struct file *file);
/* default file operations
* used by drivers if they override only some operations
*/
int lirc_dev_fop_open(struct inode *inode, struct file *file);
int lirc_dev_fop_close(struct inode *inode, struct file *file);
unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait);
long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
ssize_t lirc_dev_fop_read(struct file *file, char __user *buffer, size_t length,
loff_t *ppos);
ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer,
size_t length, loff_t *ppos);
#endif
Moreover, I needed to change v4l/lirc_dev.c and linux/drivers/media/IR/lirc_dev.c files - after all #include's I added
and then added the following lines to the and of v4l/compat.h file:
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
#define noop_llseek NULL
#endif
This is needed since the function noop_llseek is defined for kernels 2.6.37 and older; the code is again copied from official q-box drivers.
6) After that, it's time to compile:
7) Then, installation. The order in which resulting modules are inserted is important, and as I didn't want to investigate the original s2-liplianin makefile, I just did
on my Ubuntu system. As module format is incorrect for its architecture, so I got error messages that exactly told me the order in which modules should be inserted, and nothing was really done on Ubuntu system. Then I wrote 2 scripts - for copying modules and for inserting them (of course, normally one needs only one script that does it all, but when I was figuring things out these scripts were useful). I executed them from the router with the folder s2-liplianin mounted with NFS. The script for copying:
#!/bin/sh
rm /lib/modules/2.6.32.27/lirc_dev.ko
rm /lib/modules/2.6.32.27/dvb-core.ko
rm /lib/modules/2.6.32.27/stb6000.ko
rm /lib/modules/2.6.32.27/stv0288.ko
rm /lib/modules/2.6.32.27/ir-core.ko
rm /lib/modules/2.6.32.27/dvb-usb.ko
rm /lib/modules/2.6.32.27/ir-common.ko
rm /lib/modules/2.6.32.27/dvb-usb-dw2102.ko
cp ./v4l/lirc_dev.ko /lib/modules/2.6.32.27/
cp ./v4l/dvb-core.ko /lib/modules/2.6.32.27/
cp ./v4l/stb6000.ko /lib/modules/2.6.32.27/
cp ./v4l/stv0288.ko /lib/modules/2.6.32.27/
cp ./v4l/ir-core.ko /lib/modules/2.6.32.27/
cp ./v4l/dvb-usb.ko /lib/modules/2.6.32.27/
cp ./v4l/ir-common.ko /lib/modules/2.6.32.27/
cp ./v4l/dvb-usb-dw2102.ko /lib/modules/2.6.32.27/
And the one for inserting:
#!/bin/sh
rmmod dvb-usb-dw2102
rmmod ir-common
rmmod dvb-usb
rmmod ir-core
rmmod stv0288
rmmod stb6000
rmmod dvb-core
rmmod lirc-dev
insmod lirc-dev
insmod dvb-core
insmod stb6000
insmod stv0288
insmod ir-core
insmod dvb-usb
insmod ir-common
insmod dvb-usb-dw2102
If something is wrong, the messages about errors will appear in dmesg.
8) To make modules load on the startup I added the script 70-dvb-tbs-qbox to /etc/modules.d folder on my router:
lirc-dev
dvb-core
stb6000
stv0288
ir-core
dvb-usb force_pid_filter_usage=1
ir-common
dvb-usb-dw2102
9) Note, that to make dvb-apps utilities work, you need to make symlinks for dvb0.* files in /dev:
mkdir /dev/dvb
mkdir /dev/dvb/adapter0
ln -s /dev/dvb0.demux0 /dev/dvb/adapter0/demux0
ln -s /dev/dvb0.dvr0 /dev/dvb/adapter0/dvr0
ln -s /dev/dvb0.frontend0 /dev/dvb/adapter0/frontend0
ln -s /dev/dvb0.net0 /dev/dvb/adapter0/net0
Hope it will be useful 
