Subject: Re: linux-next: Tree for January 5 (multimedia #3)

From: Randy Dunlap <[email-masked]>
Date: Wed, 07 Jan 2009 10:34:11 -0800

Mauro Carvalho Chehab wrote:
> On Mon, 5 Jan 2009 12:09:27 -0800
> Randy Dunlap <[email-masked]> wrote:
> 
>> On Mon, 5 Jan 2009 17:35:17 +1100 Stephen Rothwell wrote:
>>
>>> Hi all,
>>>
>>> This tree will not build a powerpc ppc4xx_defconfig due to a kvm problem.
>>>
>>> Changes since 20090102:
>>
>> drivers/built-in.o: In function `cx88_call_i2c_clients':
>> (.text+0x20af17): undefined reference to `videobuf_dvb_get_frontend'
>> drivers/built-in.o: In function `cx8802_probe':
>> cx88-mpeg.c:(.devinit.text+0x268c4): undefined reference to `videobuf_dvb_alloc_frontend'
>> cx88-mpeg.c:(.devinit.text+0x268ea): undefined reference to `videobuf_dvb_dealloc_frontends'
> 
> This one were trickier. Patch enclosed.
> 
> Cheers,
> Mauro

Hi Mauro,

After applying this patch, now I get these build errors:

drivers/built-in.o: In function `mpeg_release':
cx88-blackbird.c:(.text+0x21096d): undefined reference to `cx8802_cancel_buffers'
cx88-blackbird.c:(.text+0x2109a3): undefined reference to `cx8802_get_device'
cx88-blackbird.c:(.text+0x2109bd): undefined reference to `cx8802_get_driver'
drivers/built-in.o: In function `bb_buf_queue':
cx88-blackbird.c:(.text+0x210a06): undefined reference to `cx8802_buf_queue'
drivers/built-in.o: In function `bb_buf_prepare':
cx88-blackbird.c:(.text+0x210a25): undefined reference to `cx8802_buf_prepare'
drivers/built-in.o: In function `mpeg_open':
cx88-blackbird.c:(.text+0x210a59): undefined reference to `cx8802_get_device'
cx88-blackbird.c:(.text+0x210aa2): undefined reference to `cx8802_get_driver'
drivers/built-in.o: In function `blackbird_init':
cx88-blackbird.c:(.text+0x210d18): undefined reference to `cx8802_register_driver'
drivers/built-in.o: In function `blackbird_fini':
cx88-blackbird.c:(.text+0x210fbc): undefined reference to `cx8802_unregister_driver'

> ---
> 
> cx88: Fix some Kbuild troubles
> 
> As Randy Dunlap <[email-masked]> reported, cx88 has some compilation issues:
> 
> drivers/built-in.o: In function `cx88_call_i2c_clients':
> (.text+0x20af17): undefined reference to `videobuf_dvb_get_frontend'
> drivers/built-in.o: In function `cx8802_probe':
> cx88-mpeg.c:(.devinit.text+0x268c4): undefined reference to `videobuf_dvb_alloc_frontend'
> cx88-mpeg.c:(.devinit.text+0x268ea): undefined reference to `videobuf_dvb_dealloc_frontends'
> 
> With those configs:
> 
> CONFIG_VIDEO_CX88=y
> CONFIG_VIDEO_CX88_BLACKBIRD=y
> CONFIG_VIDEO_CX88_DVB=m
> CONFIG_DVB_CORE=m
> 
> After carefully examining the code, with the current code, several cx88 drivers
> (cx8800, cx8802, cx88_dvb and cx88_blackbird) should be compiled as a module,
> if one of them is marked as such. Just fixing Kconfig could create a very complex
> set of rules. Also, this hides a problem with the current approach where the dvb
> functionality weren't confined inside dvb module.
> 
> What happens is that:
> 	- cx88-i2c (part of cx8800) has some special rules if DVB;
> 	- cx88-mpeg (cx8802 module) has also part of DVB init code;
> 	- cx88-dvb has the rest of the dvb code;
> 	- cx88-blackbird can be used with cx88-mpeg, having cx88-dvb or not.
> 
> So, instead of doing some tricks at Kconfig and wait for a next breakage,
> this patch moves the dvb code inside cx88-i2c and cx88-mpeg into cx88-dvb.
> 
> Another problem is that cx8802 were being compiled, even without cx88-dvb
> and cx88-blackbird modules.
> 
> While on this code, let's fix also a reported problem:
> http://www.linuxtv.org/pipermail/linux-dvb/2009-January/031225.html
> 
> A solution for the issue were proposed here:
> http://www.mail-archive.com/[email-masked]/msg00021.html
> 
> Thanks to Randy, Andy, Gregoire and Thomas for helping us to detect
> and solve the issues.
> 
> Signed-off-by: Mauro Carvalho Chehab <[email-masked]>
> 
> diff --git a/drivers/media/video/cx88/Kconfig b/drivers/media/video/cx88/Kconfig
> index b0f8375..69ad968 100644
> --- a/drivers/media/video/cx88/Kconfig
> +++ b/drivers/media/video/cx88/Kconfig
> @@ -69,6 +69,12 @@ config VIDEO_CX88_DVB
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called cx88-dvb.
>  
> +config VIDEO_CX88_MPEG
> +	tristate
> +	depends on VIDEO_CX88_DVB
> +	depends on VIDEO_CX88_BLACKBIRD
> +	default y
> +
>  config VIDEO_CX88_VP3054
>  	tristate "VP-3054 Secondary I2C Bus Support"
>  	default m
> diff --git a/drivers/media/video/cx88/Makefile b/drivers/media/video/cx88/Makefile
> index 6ec30f2..b06b127 100644
> --- a/drivers/media/video/cx88/Makefile
> +++ b/drivers/media/video/cx88/Makefile
> @@ -3,7 +3,8 @@ cx88xx-objs	:= cx88-cards.o cx88-core.o cx88-i2c.o cx88-tvaudio.o \
>  cx8800-objs	:= cx88-video.o cx88-vbi.o
>  cx8802-objs	:= cx88-mpeg.o
>  
> -obj-$(CONFIG_VIDEO_CX88) += cx88xx.o cx8800.o cx8802.o
> +obj-$(CONFIG_VIDEO_CX88) += cx88xx.o cx8800.o
> +obj-$(CONFIG_VIDEO_CX88_MPEG) += cx8802.o
>  obj-$(CONFIG_VIDEO_CX88_ALSA) += cx88-alsa.o
>  obj-$(CONFIG_VIDEO_CX88_BLACKBIRD) += cx88-blackbird.o
>  obj-$(CONFIG_VIDEO_CX88_DVB) += cx88-dvb.o
> diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c
> index da4dd49..613dfea 100644
> --- a/drivers/media/video/cx88/cx88-dvb.c
> +++ b/drivers/media/video/cx88/cx88-dvb.c
> @@ -138,6 +138,28 @@ static int cx88_dvb_bus_ctrl(struct dvb_frontend* fe, int acquire)
>  	return ret;
>  }
>  
> +static void cx88_dvb_gate_ctrl(struct cx88_core  *core, int open)
> +{
> +	struct videobuf_dvb_frontends *f;
> +	struct videobuf_dvb_frontend *fe;
> +
> +	if (!core->dvbdev)
> +		return;
> +
> +	f = &core->dvbdev->frontends;
> +
> +	if (!f)
> +		return;
> +
> +	if (f->gate <= 1) /* undefined or fe0 */
> +		fe = videobuf_dvb_get_frontend(f, 1);
> +	else
> +		fe = videobuf_dvb_get_frontend(f, f->gate);
> +
> +	if (fe && fe->dvb.frontend && fe->dvb.frontend->ops.i2c_gate_ctrl)
> +		fe->dvb.frontend->ops.i2c_gate_ctrl(fe->dvb.frontend, open);
> +}
> +
>  /* ------------------------------------------------------------------ */
>  
>  static int dvico_fusionhdtv_demod_init(struct dvb_frontend* fe)
> @@ -597,12 +619,30 @@ static int dvb_register(struct cx8802_dev *dev)
>  	struct cx88_core *core = dev->core;
>  	struct videobuf_dvb_frontend *fe0, *fe1 = NULL;
>  	int mfe_shared = 0; /* bus not shared by default */
> +	int i;
>  
>  	if (0 != core->i2c_rc) {
>  		printk(KERN_ERR "%s/2: no i2c-bus available, cannot attach dvb drivers\n", core->name);
>  		goto frontend_detach;
>  	}
>  
> +	if (!core->board.num_frontends)
> +		return -EINVAL;
> +
> +	mutex_init(&dev->frontends.lock);
> +	INIT_LIST_HEAD(&dev->frontends.felist);
> +
> +	printk(KERN_INFO "%s() allocating %d frontend(s)\n", __func__,
> +			 core->board.num_frontends);
> +	for (i = 1; i <= core->board.num_frontends; i++) {
> +		fe0 = videobuf_dvb_alloc_frontend(&dev->frontends, i);
> +		if (!fe0) {
> +			printk(KERN_ERR "%s() failed to alloc\n", __func__);
> +			videobuf_dvb_dealloc_frontends(&dev->frontends);
> +			goto frontend_detach;
> +		}
> +	}
> +
>  	/* Get the first frontend */
>  	fe0 = videobuf_dvb_get_frontend(&dev->frontends, 1);
>  	if (!fe0)
> @@ -611,6 +651,9 @@ static int dvb_register(struct cx8802_dev *dev)
>  	/* multi-frontend gate control is undefined or defaults to fe0 */
>  	dev->frontends.gate = 0;
>  
> +	/* Sets the gate control callback to be used by i2c command calls */
> +	core->gate_ctrl = cx88_dvb_gate_ctrl;
> +
>  	/* init frontend(s) */
>  	switch (core->boardnr) {
>  	case CX88_BOARD_HAUPPAUGE_DVB_T1:
> @@ -1109,6 +1152,7 @@ static int dvb_register(struct cx8802_dev *dev)
>  		&dev->pci->dev, adapter_nr, mfe_shared);
>  
>  frontend_detach:
> +	core->gate_ctrl = NULL;
>  	videobuf_dvb_dealloc_frontends(&dev->frontends);
>  	return -EINVAL;
>  }
> @@ -1270,6 +1314,8 @@ static int cx8802_dvb_remove(struct cx8802_driver *drv)
>  
>  	vp3054_i2c_remove(dev);
>  
> +	core->gate_ctrl = NULL;
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/media/video/cx88/cx88-i2c.c b/drivers/media/video/cx88/cx88-i2c.c
> index 1ab691d..c0ff230 100644
> --- a/drivers/media/video/cx88/cx88-i2c.c
> +++ b/drivers/media/video/cx88/cx88-i2c.c
> @@ -116,30 +116,16 @@ static int detach_inform(struct i2c_client *client)
>  
>  void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
>  {
> -#if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
> -	struct videobuf_dvb_frontends *f = &core->dvbdev->frontends;
> -	struct videobuf_dvb_frontend *fe = NULL;
> -#endif
>  	if (0 != core->i2c_rc)
>  		return;
>  
> -#if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
> -	if (core->dvbdev && f) {
> -		if(f->gate <= 1) /* undefined or fe0 */
> -			fe = videobuf_dvb_get_frontend(f, 1);
> -		else
> -			fe = videobuf_dvb_get_frontend(f, f->gate);
> +	if (core->gate_ctrl)
> +		core->gate_ctrl(core, 1);
>  
> -		if (fe && fe->dvb.frontend && fe->dvb.frontend->ops.i2c_gate_ctrl)
> -			fe->dvb.frontend->ops.i2c_gate_ctrl(fe->dvb.frontend, 1);
> +	i2c_clients_command(&core->i2c_adap, cmd, arg);
>  
> -		i2c_clients_command(&core->i2c_adap, cmd, arg);
> -
> -		if (fe && fe->dvb.frontend && fe->dvb.frontend->ops.i2c_gate_ctrl)
> -			fe->dvb.frontend->ops.i2c_gate_ctrl(fe->dvb.frontend, 0);
> -	} else
> -#endif
> -		i2c_clients_command(&core->i2c_adap, cmd, arg);
> +	if (core->gate_ctrl)
> +		core->gate_ctrl(core, 0);
>  }
>  
>  static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
> diff --git a/drivers/media/video/cx88/cx88-mpeg.c b/drivers/media/video/cx88/cx88-mpeg.c
> index 59164fc..b295b76 100644
> --- a/drivers/media/video/cx88/cx88-mpeg.c
> +++ b/drivers/media/video/cx88/cx88-mpeg.c
> @@ -787,6 +787,9 @@ static int __devinit cx8802_probe(struct pci_dev *pci_dev,
>  	dev->pci = pci_dev;
>  	dev->core = core;
>  
> +	/* Maintain a reference so cx88-video can query the 8802 device. */
> +	core->dvbdev = dev;
> +
>  	err = cx8802_init_common(dev);
>  	if (err != 0)
>  		goto fail_free;
> @@ -794,32 +797,6 @@ static int __devinit cx8802_probe(struct pci_dev *pci_dev,
>  	INIT_LIST_HEAD(&dev->drvlist);
>  	list_add_tail(&dev->devlist,&cx8802_devlist);
>  
> -#if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
> -	mutex_init(&dev->frontends.lock);
> -	INIT_LIST_HEAD(&dev->frontends.felist);
> -
> -	if (core->board.num_frontends) {
> -		struct videobuf_dvb_frontend *fe;
> -		int i;
> -
> -		printk(KERN_INFO "%s() allocating %d frontend(s)\n", __func__,
> -			core->board.num_frontends);
> -		for (i = 1; i <= core->board.num_frontends; i++) {
> -			fe = videobuf_dvb_alloc_frontend(&dev->frontends, i);
> -			if(fe == NULL) {
> -				printk(KERN_ERR "%s() failed to alloc\n",
> -					__func__);
> -				videobuf_dvb_dealloc_frontends(&dev->frontends);
> -				err = -ENOMEM;
> -				goto fail_free;
> -			}
> -		}
> -	}
> -#endif
> -
> -	/* Maintain a reference so cx88-video can query the 8802 device. */
> -	core->dvbdev = dev;
> -
>  	/* now autoload cx88-dvb or cx88-blackbird */
>  	request_modules(dev);
>  	return 0;
> @@ -827,6 +804,7 @@ static int __devinit cx8802_probe(struct pci_dev *pci_dev,
>   fail_free:
>  	kfree(dev);
>   fail_core:
> +	core->dvbdev = NULL;
>  	cx88_core_put(core,pci_dev);
>  	return err;
>  }
> diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
> index eb9ce30..60a8b31 100644
> --- a/drivers/media/video/cx88/cx88.h
> +++ b/drivers/media/video/cx88/cx88.h
> @@ -302,6 +302,7 @@ struct cx88_dmaqueue {
>  	struct btcx_riscmem    stopper;
>  	u32                    count;
>  };
> +struct cx88_core;
>  
>  struct cx88_core {
>  	struct list_head           devlist;
> @@ -334,7 +335,8 @@ struct cx88_core {
>  
>  	/* config info -- dvb */
>  #if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
> -	int 			   (*prev_set_voltage)(struct dvb_frontend* fe, fe_sec_voltage_t voltage);
> +	int 			   (*prev_set_voltage)(struct dvb_frontend *fe, fe_sec_voltage_t voltage);
> +	void			   (*gate_ctrl)(struct cx88_core  *core, int open);
>  #endif
>  
>  	/* state info */

-- 
~Randy