msp3400.c

该代码是天敏电视卡天敏大师4的核心芯片在linux下面的驱动

			break;
		case VIDEO_MODE_NTSC:  /* BTSC */
			mode = 0x2003;
			std  = 0x0020;
			break;
		case VIDEO_MODE_SECAM: 
			mode = 0x0003;
			std  = 1;
			break;
		case VIDEO_MODE_RADIO:
			mode = 0x0003;
			std  = 0x0040;
			break;
		default:
			mode = 0x0003;
			std  = 1;
			break;
		}
		msp3400c_write(client, I2C_MSP3400C_DEM, 0x30, mode);
		msp3400c_write(client, I2C_MSP3400C_DEM, 0x20, std);

		if (debug) {
			int i;
			for (i = 0; modelist[i].name != NULL; i++)
				if (modelist[i].retval == std)
					break;
			printk(KERN_DEBUG "msp3410: setting mode: %s (0x%04x)\n",
			       modelist[i].name ? modelist[i].name : "unknown",std);
		}

		if (std != 1) {
			/* programmed some specific mode */
			val = std;
		} else {
			/* triggered autodetect */
			for (;;) {
				if (msp34xx_sleep(msp,HZ/10))
					goto done;
				if (msp->restart)
					goto restart;

				/* check results */
				val = msp3400c_read(client, I2C_MSP3400C_DEM, 0x7e);
				if (val < 0x07ff)
					break;
				dprintk(KERN_DEBUG "msp3410: detection still in progress\n");
			}
		}
		for (i = 0; modelist[i].name != NULL; i++)
			if (modelist[i].retval == val)
				break;
		dprintk(KERN_DEBUG "msp3410: current mode: %s (0x%04x)\n",
			modelist[i].name ? modelist[i].name : "unknown",
			val);
		msp->main   = modelist[i].main;
		msp->second = modelist[i].second;

		if (amsound && (msp->norm == VIDEO_MODE_SECAM) && (val != 0x0009)) {
			/* autodetection has failed, let backup */
			dprintk(KERN_DEBUG "msp3410: autodetection failed,"
				" switching to backup mode: %s (0x%04x)\n",
				modelist[8].name ? modelist[8].name : "unknown",val);
			val = 0x0009;
			msp3400c_write(client, I2C_MSP3400C_DEM, 0x20, val);
		}

		/* set various prescales */
		msp3400c_write(client, I2C_MSP3400C_DFP, 0x0d, 0x1900); /* scart */
		msp3400c_write(client, I2C_MSP3400C_DFP, 0x0e, 0x2403); /* FM */
		msp3400c_write(client, I2C_MSP3400C_DFP, 0x10, 0x5a00); /* nicam */

		/* set stereo */
		switch (val) {
		case 0x0008: /* B/G NICAM */
		case 0x000a: /* I NICAM */
			if (val == 0x0008)
				msp->mode = MSP_MODE_FM_NICAM1;
			else
				msp->mode = MSP_MODE_FM_NICAM2;
			/* just turn on stereo */
			msp->stereo = VIDEO_SOUND_STEREO;
			msp->nicam_on = 1;
			msp->watch_stereo = 1;
			msp3400c_setstereo(client,VIDEO_SOUND_STEREO);
			break;
		case 0x0009:			
			msp->mode = MSP_MODE_AM_NICAM;
			msp->stereo = VIDEO_SOUND_MONO;
			msp->nicam_on = 1;
			msp3400c_setstereo(client,VIDEO_SOUND_MONO);
			msp->watch_stereo = 1;
			break;
		case 0x0020: /* BTSC */
			/* just turn on stereo */
			msp->mode   = MSP_MODE_BTSC;
			msp->stereo = VIDEO_SOUND_STEREO;
			msp->nicam_on = 0;
			msp->watch_stereo = 1;
			msp3400c_setstereo(client,VIDEO_SOUND_STEREO);
			break;
		case 0x0040: /* FM radio */
			msp->mode   = MSP_MODE_FM_RADIO;
			msp->stereo = VIDEO_SOUND_STEREO;
			msp->nicam_on = 0;
			msp->watch_stereo = 0;
			/* not needed in theory if HAVE_RADIO(), but
			   short programming enables carrier mute */
			msp3400c_setmode(client,MSP_MODE_FM_RADIO);
			msp3400c_setcarrier(client, MSP_CARRIER(10.7),
					    MSP_CARRIER(10.7));
			/* scart routing */
			msp3400c_set_scart(client,SCART_IN2,0);
#if 0
			/* radio from SCART_IN2 */
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x08, 0x0220);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x09, 0x0220);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x0b, 0x0220);
#else
			/* msp34xx does radio decoding */
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x08, 0x0020);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x09, 0x0020);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x0b, 0x0020);
#endif
			break;
		case 0x0003:
		case 0x0004:
		case 0x0005:
			msp->mode   = MSP_MODE_FM_TERRA;
			msp->stereo = VIDEO_SOUND_MONO;
			msp->nicam_on = 0;
			msp->watch_stereo = 1;
			break;
		}
		
		/* unmute + restore dfp registers */
		msp3400c_setbass(client, msp->bass);
		msp3400c_settreble(client, msp->treble);
		msp3400c_setvolume(client, msp->muted, msp->left, msp->right);
		msp3400c_restore_dfp(client);

		if (msp->watch_stereo)
			mod_timer(&msp->wake_stereo, jiffies+HZ);

		msp->active = 0;
	}

done:
	msp->active = 0;
	dprintk(KERN_DEBUG "msp3410: thread: exit\n");
        complete_and_exit(&msp->texit, 0);
	return 0;
}

/* ----------------------------------------------------------------------- */

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
static int msp_attach(struct i2c_adapter *adap, int addr, int kind);
#else
static int msp_attach(struct i2c_adapter *adap, int addr,
		      unsigned short flags, int kind);
#endif
static int msp_detach(struct i2c_client *client);
static int msp_probe(struct i2c_adapter *adap);
static int msp_command(struct i2c_client *client, unsigned int cmd, void *arg);

static struct i2c_driver driver = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
	.owner          = THIS_MODULE,
#endif
        .name           = "i2c msp3400 driver",
        .id             = I2C_DRIVERID_MSP3400,
        .flags          = I2C_DF_NOTIFY,
        .attach_adapter = msp_probe,
        .detach_client  = msp_detach,
        .command        = msp_command,
};

static struct i2c_client client_template = 
{
	I2C_DEVNAME("(unset)"),
	.flags     = I2C_CLIENT_ALLOW_USE,
        .driver    = &driver,
};

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
static int msp_attach(struct i2c_adapter *adap, int addr, int kind)
#else
static int msp_attach(struct i2c_adapter *adap, int addr,
		      unsigned short flags, int kind)
#endif
{
	struct msp3400c *msp;
        struct i2c_client *c;
	int i;

        client_template.adapter = adap;
        client_template.addr = addr;

        if (-1 == msp3400c_reset(&client_template)) {
                dprintk("msp3400: no chip found\n");
                return -1;
        }
	
        if (NULL == (c = kmalloc(sizeof(struct i2c_client),GFP_KERNEL)))
                return -ENOMEM;
        memcpy(c,&client_template,sizeof(struct i2c_client));
	if (NULL == (msp = kmalloc(sizeof(struct msp3400c),GFP_KERNEL))) {
		kfree(c);
		return -ENOMEM;
	}
	
	memset(msp,0,sizeof(struct msp3400c));
	msp->left   = 65535;
	msp->right  = 65535;
	msp->bass   = 32768;
	msp->treble = 32768;
	msp->input  = -1;
	msp->muted  = 1;
	for (i = 0; i < DFP_COUNT; i++)
		msp->dfp_regs[i] = -1;

	i2c_set_clientdata(c, msp);
	init_waitqueue_head(&msp->wq);

	if (-1 == msp3400c_reset(c)) {
		kfree(msp);
		kfree(c);
		dprintk("msp3400: no chip found\n");
		return -1;
	}
    
	msp->rev1 = msp3400c_read(c, I2C_MSP3400C_DFP, 0x1e);
	if (-1 != msp->rev1)
		msp->rev2 = msp3400c_read(c, I2C_MSP3400C_DFP, 0x1f);
	if ((-1 == msp->rev1) || (0 == msp->rev1 && 0 == msp->rev2)) {
		kfree(msp);
		kfree(c);
		printk("msp3400: error while reading chip version\n");
		return -1;
	}

#if 0
	/* this will turn on a 1kHz beep - might be useful for debugging... */
	msp3400c_write(c,I2C_MSP3400C_DFP, 0x0014, 0x1040);
#endif
	msp3400c_setvolume(c,msp->muted,msp->left,msp->right);

	snprintf(c->name, sizeof(c->name), "MSP34%02d%c-%c%d",
		 (msp->rev2>>8)&0xff, (msp->rev1&0xff)+'@',
		 ((msp->rev1>>8)&0xff)+'@', msp->rev2&0x1f);

	if (simple == -1) {
		/* default mode */
		msp->simple = HAVE_SIMPLE(msp);
	} else {
		/* use insmod option */
		msp->simple = simple;
	}

	/* timer for stereo checking */
	init_timer(&msp->wake_stereo);
	msp->wake_stereo.function = msp3400c_stereo_wake;
	msp->wake_stereo.data     = (unsigned long)msp;

	/* hello world :-) */
	printk(KERN_INFO "msp34xx: init: chip=%s",i2c_clientname(c));
	if (HAVE_NICAM(msp))
		printk(" +nicam");
	if (HAVE_SIMPLE(msp))
		printk(" +simple");
	if (HAVE_RADIO(msp))
		printk(" +radio");
	printk("\n");

	/* startup control thread */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	MOD_INC_USE_COUNT;
#endif
	init_completion(&msp->texit);
	msp->tpid = kernel_thread(msp->simple ? msp3410d_thread : msp3400c_thread,
				  (void *)c, 0);
	if (msp->tpid < 0)
		printk(KERN_WARNING "msp34xx: kernel_thread() failed\n");
	wake_up_interruptible(&msp->wq);

	/* done */
        i2c_attach_client(c);
	return 0;
}

static int msp_detach(struct i2c_client *client)
{
	struct msp3400c *msp  = i2c_get_clientdata(client);
	
	/* shutdown control thread */
	del_timer_sync(&msp->wake_stereo);
	if (msp->tpid >= 0) {
		msp->rmmod = 1;
		wake_up_interruptible(&msp->wq);
		wait_for_completion(&msp->texit);
	}
    	msp3400c_reset(client);

	i2c_detach_client(client);
	kfree(msp);
	kfree(client);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	MOD_DEC_USE_COUNT;
#endif
	return 0;
}

static int msp_probe(struct i2c_adapter *adap)
{
#ifdef I2C_ADAP_CLASS_TV_ANALOG
	if (adap->class & I2C_ADAP_CLASS_TV_ANALOG)
		return i2c_probe(adap, &addr_data, msp_attach);
#else
	switch (adap->id) {
	case I2C_ALGO_BIT | I2C_HW_SMBUS_VOODOO3:
	case I2C_ALGO_BIT | I2C_HW_B_BT848:
	//case I2C_ALGO_SAA7134:
		return i2c_probe(adap, &addr_data, msp_attach);
		break;
	}
#endif
	return 0;
}

static void msp_wake_thread(struct i2c_client *client)
{
	struct msp3400c *msp  = i2c_get_clientdata(client);

	msp3400c_setvolume(client,msp->muted,0,0);
	msp->watch_stereo=0;
	del_timer(&msp->wake_stereo);
	if (msp->active)
		msp->restart = 1;
	wake_up_interruptible(&msp->wq);
}

static int msp_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct msp3400c *msp  = i2c_get_clientdata(client);
        __u16           *sarg = arg;
	int scart = 0;

	switch (cmd) {

	case AUDC_SET_INPUT:
		dprintk(KERN_DEBUG "msp34xx: AUDC_SET_INPUT(%d)\n",*sarg);
		if (*sarg == msp->input)
			break;
		msp->input = *sarg;
		switch (*sarg) {
		case AUDIO_RADIO:
			/* Hauppauge uses IN2 for the radio */
			msp->mode   = MSP_MODE_FM_RADIO;
			scart       = SCART_IN2;
			break;
		case AUDIO_EXTERN_1:
			/* IN1 is often used for external input ... */
			msp->mode   = MSP_MODE_EXTERN;
			scart       = SCART_IN1;
			break;
		case AUDIO_EXTERN_2:
			/* ... sometimes it is IN2 through ;) */
			msp->mode   = MSP_MODE_EXTERN;
			scart       = SCART_IN2;
			break;
		case AUDIO_TUNER:
			msp->mode   = -1;
			msp_wake_thread(client);
			break;
		default:
			if (*sarg & AUDIO_MUTE)
				msp3400c_set_scart(client,SCART_MUTE,0);
			break;
		}
		if (scart) {
			msp->stereo = VIDEO_SOUND_STEREO;
			msp3400c_set_scart(client,scart,0);
			msp3400c_write(client,I2C_MSP3400C_DFP,0x000d,0x1900);
			msp3400c_setstereo(client,msp->stereo);
		}
		if (msp->active)
			msp->restart = 1;
		break;

	case AUDC_SET_RADIO:
		dprintk(KERN_DEBUG "msp34xx: AUDC_SET_RADIO\n");
		msp->norm = VIDEO_MODE_RADIO;
		msp->watch_stereo=0;
		del_timer(&msp->wake_stereo);
		dprintk(KERN_DEBUG "msp34xx: switching to radio mode\n");
		if (msp->simple) {
			/* the thread will do for us */
			msp_wake_thread(client);
		} else {
			/* set msp3400 to FM radio mode */
			msp3400c_setmode(client,MSP_MODE_FM_RADIO);
			msp3400c_setcarrier(client, MSP_CARRIER(10.7),MSP_CARRIER(10.7));
			msp3400c_setvolume(client,msp->muted,msp->left,msp->right);			
		}
		if (msp->active)
			msp->restart = 1;
		break;

#if 1
	/* work-in-progress:  hook to control the DFP registers */
	case MSP_SET_DFPREG:
	{
		struct msp_dfpreg *r = arg;
		unsigned int i;

		if (r->reg < 0 || r->reg >= DFP_COUNT)
			return -EINVAL;
		for (i = 0; i < ARRAY_SIZE(bl_dfp); i++)
			if (r->reg == bl_dfp[i])
				return -EINVAL;
		msp->dfp_regs[r->reg] = r->value;
		msp3400c_write(client,I2C_MSP3400C_DFP,r->reg,r->value);
		return 0;
	}
	case MSP_GET_DFPREG:
	{
		struct msp_dfpreg *r = arg;

		if (r->reg < 0 || r->reg >= DFP_COUNT)
			return -EINVAL;
		r->value = msp3400c_read(client,I2C_MSP3400C_DFP,r->reg);
		return 0;
	}
#endif

	/* --- v4l ioctls --- */
	/* take care: bttv does userspace copying, we'll get a
	   kernel pointer here... */
	case VIDIOCGAUDIO:
	{
		struct video_audio *va = arg;

		dprintk(KERN_DEBUG "msp34xx: VIDIOCGAUDIO\n");
		va->flags |= VIDEO_AUDIO_VOLUME |
			VIDEO_AUDIO_BASS |
			VIDEO_AUDIO_TREBLE |
			VIDEO_AUDIO_MUTABLE;
		if (msp->muted)
			va->flags |= VIDEO_AUDIO_MUTE;
		va->volume=max(msp->left,msp->right);

		if (0 == va->volume) {
			va->balance = 32768;
		} else {
			va->balance = (32768 * min(msp->left,msp->right))
				/ va->volume;
			va->balance = (msp->left<msp->right) ?
				(65535 - va->balance) : va->balance;
		}
		va->bass = msp->bass;
		va->treble = msp->treble;

		if (msp->norm != VIDEO_MODE_RADIO) {
			autodetect_stereo(client);
			va->mode = msp->stereo;
		}
		break;
	}
	case VIDIOCSAUDIO:
	{
		struct video_audio *va = arg;

		dprintk(KERN_DEBUG "msp34xx: VIDIOCSAUDIO\n");
		msp->muted = (va->flags & VIDEO_AUDIO_MUTE);
		msp->left = (min(65536 - va->balance,32768) *
			     va->volume) / 32768;
		msp->right = (min(va->balance,(__u16)32768) *
			      va->volume) / 32768;
		msp->bass = va->bass;
		msp->treble = va->treble;
		msp3400c_setvolume(client,msp->muted,msp->left,msp->right);
		msp3400c_setbass(client,msp->bass);
		msp3400c_settreble(client,msp->treble);

		if (va->mode != 0 && msp->norm != VIDEO_MODE_RADIO) {
			msp->watch_stereo=0;
			del_timer(&msp->wake_stereo);
			msp->stereo = va->mode & 0x0f;
			msp3400c_setstereo(client,va->mode & 0x0f);
		}
		break;
	}
	case VIDIOCSCHAN:
	{
		struct video_channel *vc = arg;
		
		dprintk(KERN_DEBUG "msp34xx: VIDIOCSCHAN (norm=%d)\n",vc->norm);
		msp->norm = vc->norm;
		break;
	}
	case VIDIOCSFREQ:
	{
		/* new channel -- kick audio carrier scan */
		dprintk(KERN_DEBUG "msp34xx: VIDIOCSFREQ\n");
		msp_wake_thread(client);
		break;
	}

	default:
		/* nothing */
		break;
	}
	return 0;
}

/* ----------------------------------------------------------------------- */

static int msp3400_init_module(void)
{
	i2c_add_driver(&driver);
	return 0;
}

static void msp3400_cleanup_module(void)
{
	i2c_del_driver(&driver);
}

module_init(msp3400_init_module);
module_exit(msp3400_cleanup_module);

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */