ad1848.c

linux 内核源代码

	int right = (value & 0x0000ff00) >> 8;
	int retvol;

	if (dev > 31)
		return -EINVAL;

	if (!(devc->supported_devices & (1 << dev)))
		return -EINVAL;

	dev = devc->mixer_reroute[dev];

	if (devc->mix_devices[dev][LEFT_CHN].nbits == 0)
		return -EINVAL;

	if (left > 100)
		left = 100;
	if (right > 100)
		right = 100;

	if (devc->mix_devices[dev][RIGHT_CHN].nbits == 0)	/* Mono control */
		right = left;

	retvol = left | (right << 8);

	/* Scale volumes */
	left = mix_cvt[left];
	right = mix_cvt[right];

	devc->levels[dev] = retvol;

	/*
	 * Set the left channel
	 */
	ad1848_mixer_set_channel(devc, dev, left, LEFT_CHN);

	/*
	 * Set the right channel
	 */
	if (devc->mix_devices[dev][RIGHT_CHN].nbits == 0)
		goto out;
	ad1848_mixer_set_channel(devc, dev, right, RIGHT_CHN);

 out:
	return retvol;
}

static void ad1848_mixer_reset(ad1848_info * devc)
{
	int i;
	char name[32];
	unsigned long flags;

	devc->mix_devices = &(ad1848_mix_devices[0]);

	sprintf(name, "%s_%d", devc->chip_name, nr_ad1848_devs);

	for (i = 0; i < 32; i++)
		devc->mixer_reroute[i] = i;

	devc->supported_rec_devices = MODE1_REC_DEVICES;

	switch (devc->model)
	{
		case MD_4231:
		case MD_4231A:
		case MD_1845:
		case MD_1845_SSCAPE:
			devc->supported_devices = MODE2_MIXER_DEVICES;
			break;

		case MD_C930:
			devc->supported_devices = C930_MIXER_DEVICES;
			devc->mix_devices = &(c930_mix_devices[0]);
			break;

		case MD_IWAVE:
			devc->supported_devices = MODE3_MIXER_DEVICES;
			devc->mix_devices = &(iwave_mix_devices[0]);
			break;

		case MD_42xB:
		case MD_4239:
			devc->mix_devices = &(cs42xb_mix_devices[0]);
			devc->supported_devices = MODE3_MIXER_DEVICES;
			break;
		case MD_4232:
		case MD_4235:
		case MD_4236:
			devc->supported_devices = MODE3_MIXER_DEVICES;
			break;

		case MD_1848:
			if (soundpro) {
				devc->supported_devices = SPRO_MIXER_DEVICES;
				devc->supported_rec_devices = SPRO_REC_DEVICES;
				devc->mix_devices = &(spro_mix_devices[0]);
				break;
			}

		default:
			devc->supported_devices = MODE1_MIXER_DEVICES;
	}

	devc->orig_devices = devc->supported_devices;
	devc->orig_rec_devices = devc->supported_rec_devices;

	devc->levels = load_mixer_volumes(name, default_mixer_levels, 1);

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
	{
		if (devc->supported_devices & (1 << i))
			ad1848_mixer_set(devc, i, devc->levels[i]);
	}
	
	ad1848_set_recmask(devc, SOUND_MASK_MIC);
	
	devc->mixer_output_port = devc->levels[31] | AUDIO_HEADPHONE | AUDIO_LINE_OUT;

	spin_lock_irqsave(&devc->lock,flags);
	if (!soundpro) {
		if (devc->mixer_output_port & AUDIO_SPEAKER)
			ad_write(devc, 26, ad_read(devc, 26) & ~0x40);	/* Unmute mono out */
		else
			ad_write(devc, 26, ad_read(devc, 26) | 0x40);	/* Mute mono out */
	} else {
		/*
		 * From the "wouldn't it be nice if the mixer API had (better)
		 * support for custom stuff" category
		 */
		/* Enable surround mode and SB16 mixer */
		ad_write(devc, 16, 0x60);
	}
	spin_unlock_irqrestore(&devc->lock,flags);
}

static int ad1848_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
{
	ad1848_info *devc = mixer_devs[dev]->devc;
	int val;

	if (cmd == SOUND_MIXER_PRIVATE1) 
	{
		if (get_user(val, (int __user *)arg))
			return -EFAULT;

		if (val != 0xffff) 
		{
			unsigned long flags;
			val &= (AUDIO_SPEAKER | AUDIO_HEADPHONE | AUDIO_LINE_OUT);
			devc->mixer_output_port = val;
			val |= AUDIO_HEADPHONE | AUDIO_LINE_OUT;	/* Always on */
			devc->mixer_output_port = val;
			spin_lock_irqsave(&devc->lock,flags);
			if (val & AUDIO_SPEAKER)
				ad_write(devc, 26, ad_read(devc, 26) & ~0x40);	/* Unmute mono out */
			else
				ad_write(devc, 26, ad_read(devc, 26) | 0x40);		/* Mute mono out */
			spin_unlock_irqrestore(&devc->lock,flags);
		}
		val = devc->mixer_output_port;
		return put_user(val, (int __user *)arg);
	}
	if (cmd == SOUND_MIXER_PRIVATE2)
	{
		if (get_user(val, (int __user *)arg))
			return -EFAULT;
		return(ad1848_control(AD1848_MIXER_REROUTE, val));
	}
	if (((cmd >> 8) & 0xff) == 'M') 
	{
		if (_SIOC_DIR(cmd) & _SIOC_WRITE)
		{
			switch (cmd & 0xff) 
			{
				case SOUND_MIXER_RECSRC:
					if (get_user(val, (int __user *)arg))
						return -EFAULT;
					val = ad1848_set_recmask(devc, val);
					break;
				
				default:
					if (get_user(val, (int __user *)arg))
					return -EFAULT;
					val = ad1848_mixer_set(devc, cmd & 0xff, val);
					break;
			} 
			return put_user(val, (int __user *)arg);
		}
		else
		{
			switch (cmd & 0xff) 
			{
				/*
				 * Return parameters
				 */
			    
				case SOUND_MIXER_RECSRC:
					val = devc->recmask;
					break;
				
				case SOUND_MIXER_DEVMASK:
					val = devc->supported_devices;
					break;
				
				case SOUND_MIXER_STEREODEVS:
					val = devc->supported_devices;
					if (devc->model != MD_C930)
						val &= ~(SOUND_MASK_SPEAKER | SOUND_MASK_IMIX);
					break;
				
				case SOUND_MIXER_RECMASK:
					val = devc->supported_rec_devices;
					break;

				case SOUND_MIXER_CAPS:
					val=SOUND_CAP_EXCL_INPUT;
					break;

				default:
					val = ad1848_mixer_get(devc, cmd & 0xff);
					break;
			}
			return put_user(val, (int __user *)arg);
		}
	}
	else
		return -EINVAL;
}

static int ad1848_set_speed(int dev, int arg)
{
	ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
	ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;

	/*
	 * The sampling speed is encoded in the least significant nibble of I8. The
	 * LSB selects the clock source (0=24.576 MHz, 1=16.9344 MHz) and other
	 * three bits select the divisor (indirectly):
	 *
	 * The available speeds are in the following table. Keep the speeds in
	 * the increasing order.
	 */
	typedef struct
	{
		int             speed;
		unsigned char   bits;
	}
	speed_struct;

	static speed_struct speed_table[] =
	{
		{5510, (0 << 1) | 1},
		{5510, (0 << 1) | 1},
		{6620, (7 << 1) | 1},
		{8000, (0 << 1) | 0},
		{9600, (7 << 1) | 0},
		{11025, (1 << 1) | 1},
		{16000, (1 << 1) | 0},
		{18900, (2 << 1) | 1},
		{22050, (3 << 1) | 1},
		{27420, (2 << 1) | 0},
		{32000, (3 << 1) | 0},
		{33075, (6 << 1) | 1},
		{37800, (4 << 1) | 1},
		{44100, (5 << 1) | 1},
		{48000, (6 << 1) | 0}
	};

	int i, n, selected = -1;

	n = sizeof(speed_table) / sizeof(speed_struct);

	if (arg <= 0)
		return portc->speed;

	if (devc->model == MD_1845 || devc->model == MD_1845_SSCAPE)	/* AD1845 has different timer than others */
	{
		if (arg < 4000)
			arg = 4000;
		if (arg > 50000)
			arg = 50000;

		portc->speed = arg;
		portc->speed_bits = speed_table[3].bits;
		return portc->speed;
	}
	if (arg < speed_table[0].speed)
		selected = 0;
	if (arg > speed_table[n - 1].speed)
		selected = n - 1;

	for (i = 1 /*really */ ; selected == -1 && i < n; i++)
	{
		if (speed_table[i].speed == arg)
			selected = i;
		else if (speed_table[i].speed > arg)
		{
			int diff1, diff2;

			diff1 = arg - speed_table[i - 1].speed;
			diff2 = speed_table[i].speed - arg;

			if (diff1 < diff2)
				selected = i - 1;
			else
				selected = i;
		}
	}
	if (selected == -1)
	{
		printk(KERN_WARNING "ad1848: Can't find speed???\n");
		selected = 3;
	}
	portc->speed = speed_table[selected].speed;
	portc->speed_bits = speed_table[selected].bits;
	return portc->speed;
}

static short ad1848_set_channels(int dev, short arg)
{
	ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;

	if (arg != 1 && arg != 2)
		return portc->channels;

	portc->channels = arg;
	return arg;
}

static unsigned int ad1848_set_bits(int dev, unsigned int arg)
{
	ad1848_info    *devc = (ad1848_info *) audio_devs[dev]->devc;
	ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;

	static struct format_tbl
	{
		  int             format;
		  unsigned char   bits;
	}
	format2bits[] =
	{
		{
			0, 0
		}
		,
		{
			AFMT_MU_LAW, 1
		}
		,
		{
			AFMT_A_LAW, 3
		}
		,
		{
			AFMT_IMA_ADPCM, 5
		}
		,
		{
			AFMT_U8, 0
		}
		,
		{
			AFMT_S16_LE, 2
		}
		,
		{
			AFMT_S16_BE, 6
		}
		,
		{
			AFMT_S8, 0
		}
		,
		{
			AFMT_U16_LE, 0
		}
		,
		{
			AFMT_U16_BE, 0
		}
	};
	int i, n = sizeof(format2bits) / sizeof(struct format_tbl);

	if (arg == 0)
		return portc->audio_format;

	if (!(arg & ad_format_mask[devc->model]))
		arg = AFMT_U8;

	portc->audio_format = arg;

	for (i = 0; i < n; i++)
		if (format2bits[i].format == arg)
		{
			if ((portc->format_bits = format2bits[i].bits) == 0)
				return portc->audio_format = AFMT_U8;		/* Was not supported */

			return arg;
		}
	/* Still hanging here. Something must be terribly wrong */
	portc->format_bits = 0;
	return portc->audio_format = AFMT_U8;
}

static struct audio_driver ad1848_audio_driver =
{
	.owner			= THIS_MODULE,
	.open			= ad1848_open,
	.close			= ad1848_close,
	.output_block		= ad1848_output_block,
	.start_input		= ad1848_start_input,
	.prepare_for_input	= ad1848_prepare_for_input,
	.prepare_for_output	= ad1848_prepare_for_output,
	.halt_io		= ad1848_halt,
	.halt_input		= ad1848_halt_input,
	.halt_output		= ad1848_halt_output,
	.trigger		= ad1848_trigger,
	.set_speed		= ad1848_set_speed,
	.set_bits		= ad1848_set_bits,
	.set_channels		= ad1848_set_channels
};

static struct mixer_operations ad1848_mixer_operations =
{
	.owner	= THIS_MODULE,
	.id	= "SOUNDPORT",
	.name	= "AD1848/CS4248/CS4231",
	.ioctl	= ad1848_mixer_ioctl
};

static int ad1848_open(int dev, int mode)
{
	ad1848_info    *devc;
	ad1848_port_info *portc;
	unsigned long   flags;

	if (dev < 0 || dev >= num_audiodevs)
		return -ENXIO;

	devc = (ad1848_info *) audio_devs[dev]->devc;
	portc = (ad1848_port_info *) audio_devs[dev]->portc;

	/* here we don't have to protect against intr */
	spin_lock(&devc->lock);
	if (portc->open_mode || (devc->open_mode & mode))
	{
		spin_unlock(&devc->lock);
		return -EBUSY;
	}
	devc->dual_dma = 0;

	if (audio_devs[dev]->flags & DMA_DUPLEX)
	{
		devc->dual_dma = 1;
	}
	devc->intr_active = 0;
	devc->audio_mode = 0;
	devc->open_mode |= mode;
	portc->open_mode = mode;
	spin_unlock(&devc->lock);
	ad1848_trigger(dev, 0);

	if (mode & OPEN_READ)
		devc->record_dev = dev;
	if (mode & OPEN_WRITE)
		devc->playback_dev = dev;
/*
 * Mute output until the playback really starts. This decreases clicking (hope so).
 */
	spin_lock_irqsave(&devc->lock,flags);
	ad_mute(devc);
	spin_unlock_irqrestore(&devc->lock,flags);

	return 0;
}

static void ad1848_close(int dev)
{
	unsigned long   flags;
	ad1848_info    *devc = (ad1848_info *) audio_devs[dev]->devc;
	ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;

	DEB(printk("ad1848_close(void)\n"));

	devc->intr_active = 0;
	ad1848_halt(dev);

	spin_lock_irqsave(&devc->lock,flags);

	devc->audio_mode = 0;
	devc->open_mode &= ~portc->open_mode;
	portc->open_mode = 0;

	ad_unmute(devc);
	spin_unlock_irqrestore(&devc->lock,flags);
}

static void ad1848_output_block(int dev, unsigned long buf, int count, int intrflag)
{
	unsigned long   flags, cnt;
	ad1848_info    *devc = (ad1848_info *) audio_devs[dev]->devc;
	ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;

	cnt = count;

	if (portc->audio_format == AFMT_IMA_ADPCM)
	{
		cnt /= 4;
	}
	else
	{
		if (portc->audio_format & (AFMT_S16_LE | AFMT_S16_BE))	/* 16 bit data */
			cnt >>= 1;
	}
	if (portc->channels > 1)
		cnt >>= 1;
	cnt--;

	if ((devc->audio_mode & PCM_ENABLE_OUTPUT) && (audio_devs[dev]->flags & DMA_AUTOMODE) &&
	    intrflag &&
	    cnt == devc->xfer_count)
	{
		devc->audio_mode |= PCM_ENABLE_OUTPUT;
		devc->intr_active = 1;
		return;	/*
			 * Auto DMA mode on. No need to react
			 */
	}
	spin_lock_irqsave(&devc->lock,flags);

	ad_write(devc, 15, (unsigned char) (cnt & 0xff));
	ad_write(devc, 14, (unsigned char) ((cnt >> 8) & 0xff));

	devc->xfer_count = cnt;
	devc->audio_mode |= PCM_ENABLE_OUTPUT;