Now, it outputs:

[10927.639641] drxk: SCU_RESULT_INVPAR while sending cmd 0x0203 with params:
[10927.646283] drxk: 02 00 00 00 10 00 07 00 03 02                    ..........

Better than ERROR -3. This happens with Terratec H5 firmware.

It adds 2 new error conditions, and something useful to track
what the heck is that.

I suspect that the scu_command is dependent on the firmware
revision.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

The driver is too limited: it assumes that UIO is used only for
controlling the antenna, and that only UIO-1 is in usage. However,
from Terratec H7 driver [1], 3 UIO's can be used. In fact, it seems
that H7 needs to use all 3. So, make the code generic enough to handle
the most complex scenario. For now, only antena GPIO can be specified,
but is is easier now to add the other GPIO/UIO needs.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

DRX-K configuration is interesting when writing/testing
new devices. Add an info line showing the discovered info.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Terratec H5 doesn't require to switch mode, but generates
an error due to this logic. Also, GPIO's are board-dependent.

So, add it at the board config struct.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

The set mode routines assume that state were changed to the
new mode, otherwise, they'll fail.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

This driver is very big and complex. An error happening in the middle
of any initialization may cause the frontend to not work. So, it
needs to properly propagate error codes internally and to userspace.

Also, printing the error codes at the places it happened helps to
discover were's a bug at the code.

Before this change, a do { } while (0) loop and lots of breaks inside
were used to propagate errors. While this works, if there are
loops inside other loops, it could be easy to forget to add another
break, causing the error to not abort the function.

Also, as not all functions were reporting errors, it is hard to
discover why something failed.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

On em28xx, tda18271C2 is accessible when the i2c port
is not touched. Touching on it breaks the driver.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

The microcode firmware provided on Terratec H5 seems to be
different. Add a parameter to allow specifying a different
firmware per-device.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

If something bad happens during firmware load, an error
should be printed at dmesg.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Don't read paste the buffer, if the firmware is corrupted.
Instead, print an error message.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Instead of using #ifdef I2C_LONG_ADR for some devices, convert
it into a parameter. Terratec H5 logs from the original driver
seems to need this mode.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Currently, the only parameter to be configured is the I2C
address. However, Terratec H5 logs shows that it needs a different
setting for some things, and it has its own firmware.

So, move the addr into a config structure, in order to allow adding
the required configuration bits.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

The normal 16-bits read routine is called as "Read16_0". This is
due to a flags that could optionally be passed. Yet, on no places
at the code, a flag is passed there.

The same happens with 16-bits write and 32-read/write routines,
and with WriteBlock.

Also, using flags, is an exception: there's no place currently using
flags, except for an #ifdef at WriteBlock.

Rename the function as just "read16", and the one that requires flags,
as "read16_flags".

This helps to see where the flags are used, and also avoid using
CamelCase on Kernel.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

This is a complex driver. Adding support for other devices with drxk
requires to be able to debug it and see where it is failing. So, add
optional printk messages to allow debugging it.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

It is hard to identify the origin for those errors without a
prefix to indicate which driver produced them:

[ 1390.220984] i2c_write error
[ 1390.224133] I2C Write error
[ 1391.284202] i2c_read error
[ 1392.288685] i2c_read error
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

One of the problems of the old CHECK_ERROR is that it was hiding
the status parameter. Maybe due to that, on a few places, the return
code might lead to return incorrect status:

drivers/media/dvb/frontends/drxk_hard.c: In function ‘load_microcode.clone.0’:
drivers/media/dvb/frontends/drxk_hard.c:1281: warning: ‘status’ may be used uninitialized in this function
drivers/media/dvb/frontends/drxk_hard.c:1281: note: ‘status’ was declared here
drivers/media/dvb/frontends/drxk_hard.c: In function ‘GetLockStatus’:
drivers/media/dvb/frontends/drxk_hard.c:1792: warning: ‘status’ may be used uninitialized in this function
drivers/media/dvb/frontends/drxk_hard.c: In function ‘Start.clone.7’:
drivers/media/dvb/frontends/drxk_hard.c:1734: warning: ‘status’ may be used uninitialized in this function
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/drxk_hard.c: In function ‘SetDVBT’:
drivers/media/dvb/frontends/drxk_hard.c:3766: warning: enumeration value ‘BANDWIDTH_5_MHZ’ not handled in switch
drivers/media/dvb/frontends/drxk_hard.c:3766: warning: enumeration value ‘BANDWIDTH_10_MHZ’ not handled in switch
drivers/media/dvb/frontends/drxk_hard.c:3766: warning: enumeration value ‘BANDWIDTH_1_712_MHZ’ not handled in switch
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

The CHK_ERROR macro does a flow control, violating chapter 12
of the Documentation/CodingStyle. Doing flow controls inside
macros is a bad idea, as it hides what's happening. It also
hides the var "status" with is also a bad idea.

The changes were done by this small perl script:
	my $blk=0;
	while (<>) {
		s /^\s+// if ($blk);
		$f =~ s/\s+$// if ($blk && /^\(/);
		$blk = 1 if (!m/\#/ && m/CHK_ERROR/);
		$blk=0 if ($blk && m/\;/);
		s/\n/ / if ($blk);
		$f.=$_;
	};
	$f=~ s,\n(\t+)CHK_ERROR\((.*)\)\;([^\n]*),\n\1status = \2;\3\n\1if (status < 0)\n\1\tbreak;,g;
	print $f;

And manually fixed.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

/home/v4l/v4l/patchwork/drivers/media/dvb/frontends/drxk_hard.c:181: multiple definition of `MulDiv32'
drivers/media/dvb/frontends/drxd.o:/home/v4l/v4l/patchwork/drivers/media/dvb/frontends/drxd_hard.c:236: first defined here
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Tons of coding-style fixes
Signed-off-by: NOliver Endriss <o.endriss@gmx.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Driver for the DRX-K DVB-C/T demodulator.
Signed-off-by: NRalph Metzler <rjkm@metzlerbros.de>
Signed-off-by: NOliver Endriss <o.endriss@gmx.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>