sb_mixer.c

基于组件方式开发操作系统的OSKIT源代码

							 * Not supported
							 */
		return -EINVAL;

	/* Differentiate depending on the chipsets */
	switch (devc->model) {
	case MDL_SMW:
		retval = smw_mixer_set(devc, dev, left, right);
		break;
	case MDL_ESS:
		retval = ess_mixer_set(devc, dev, left, right);
		break;
	default:
		retval = sb_common_mixer_set(devc, dev, left, right);
	}
	if (retval >= 0) devc->levels[dev] = retval;

	return retval;
}

/*
 * set_recsrc doesn't apply to ES188x
 */
static void set_recsrc(sb_devc * devc, int src)
{
	sb_setmixer(devc, RECORD_SRC, (sb_getmixer(devc, RECORD_SRC) & ~7) | (src & 0x7));
}

static int set_recmask(sb_devc * devc, int mask)
{
	int devmask, i;
	unsigned char  regimageL, regimageR;

	devmask = mask & devc->supported_rec_devices;

	switch (devc->model)
	{
		case MDL_SBPRO:
		case MDL_ESS:
		case MDL_JAZZ:
		case MDL_SMW:
			if (devc->model == MDL_ESS && ess_set_recmask (devc, &devmask)) {
				break;
			};
			if (devmask != SOUND_MASK_MIC &&
				devmask != SOUND_MASK_LINE &&
				devmask != SOUND_MASK_CD)
			{
				/*
				 * More than one device selected. Drop the
				 * previous selection
				 */
				devmask &= ~devc->recmask;
			}
			if (devmask != SOUND_MASK_MIC &&
				devmask != SOUND_MASK_LINE &&
				devmask != SOUND_MASK_CD)
			{
				/*
				 * More than one device selected. Default to
				 * mic
				 */
				devmask = SOUND_MASK_MIC;
			}
			if (devmask ^ devc->recmask)	/*
							 *	Input source changed
							 */
			{
				switch (devmask)
				{
					case SOUND_MASK_MIC:
						set_recsrc(devc, SRC__MIC);
						break;

					case SOUND_MASK_LINE:
						set_recsrc(devc, SRC__LINE);
						break;

					case SOUND_MASK_CD:
						set_recsrc(devc, SRC__CD);
						break;

					default:
						set_recsrc(devc, SRC__MIC);
				}
			}
			break;

		case MDL_SB16:
			if (!devmask)
				devmask = SOUND_MASK_MIC;

			if (devc->submodel == SUBMDL_ALS007) 
			{
				switch (devmask) 
				{
					case SOUND_MASK_LINE:
						sb_setmixer(devc, ALS007_RECORD_SRC, ALS007_LINE);
						break;
					case SOUND_MASK_CD:
						sb_setmixer(devc, ALS007_RECORD_SRC, ALS007_CD);
						break;
					case SOUND_MASK_SYNTH:
						sb_setmixer(devc, ALS007_RECORD_SRC, ALS007_SYNTH);
						break;
					default:           /* Also takes care of SOUND_MASK_MIC case */
						sb_setmixer(devc, ALS007_RECORD_SRC, ALS007_MIC);
						break;
				}
			}
			else
			{
				regimageL = regimageR = 0;
				for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
				{
					if ((1 << i) & devmask)
					{
						regimageL |= sb16_recmasks_L[i];
						regimageR |= sb16_recmasks_R[i];
					}
					sb_setmixer (devc, SB16_IMASK_L, regimageL);
					sb_setmixer (devc, SB16_IMASK_R, regimageR);
				}
			}
			break;
	}
	devc->recmask = devmask;
	return devc->recmask;
}

static int set_outmask(sb_devc * devc, int mask)
{
	int devmask, i;
	unsigned char  regimage;

	devmask = mask & devc->supported_out_devices;

	switch (devc->model)
	{
		case MDL_SB16:
			if (devc->submodel == SUBMDL_ALS007) 
				break;
			else
			{
				regimage = 0;
				for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
				{
					if ((1 << i) & devmask)
					{
						regimage |= (sb16_recmasks_L[i] | sb16_recmasks_R[i]);
					}
					sb_setmixer (devc, SB16_OMASK, regimage);
				}
			}
			break;
		default:
			break;
	}

	devc->outmask = devmask;
	return devc->outmask;
}

static int sb_mixer_ioctl(int dev, unsigned int cmd, caddr_t arg)
{
	sb_devc *devc = mixer_devs[dev]->devc;
	int val, ret;

	/*
	 * Use ioctl(fd, SOUND_MIXER_AGC, &mode) to turn AGC off (0) or on (1).
	 * Use ioctl(fd, SOUND_MIXER_3DSE, &mode) to turn 3DSE off (0) or on (1)
	 *					      or mode==2 put 3DSE state to mode.
	 */
	if (devc->model == MDL_SB16) {
		if (cmd == SOUND_MIXER_AGC) 
		{
			if (get_user(val, (int *)arg))
				return -EFAULT;
			sb_setmixer(devc, 0x43, (~val) & 0x01);
			return 0;
		}
		if (cmd == SOUND_MIXER_3DSE) 
		{
			/* I put here 15, but I don't know the exact version.
			   At least my 4.13 havn't 3DSE, 4.16 has it. */
			if (devc->minor < 15)
				return -EINVAL;
			if (get_user(val, (int *)arg))
				return -EFAULT;
			if (val == 0 || val == 1)
				sb_chgmixer(devc, AWE_3DSE, 0x01, val);
			else if (val == 2)
			{
				ret = sb_getmixer(devc, AWE_3DSE)&0x01;
				return put_user(ret, (int *)arg);
			}
			else
				return -EINVAL;
			return 0;
		}
	}
	if (((cmd >> 8) & 0xff) == 'M') 
	{
		if (_SIOC_DIR(cmd) & _SIOC_WRITE) 
		{
			if (get_user(val, (int *)arg))
				return -EFAULT;
			switch (cmd & 0xff) 
			{
				case SOUND_MIXER_RECSRC:
					ret = set_recmask(devc, val);
					break;

				case SOUND_MIXER_OUTSRC:
					ret = set_outmask(devc, val);
					break;

				default:
					ret = sb_mixer_set(devc, cmd & 0xff, val);
			}
		}
		else switch (cmd & 0xff) 
		{
			case SOUND_MIXER_RECSRC:
				ret = devc->recmask;
				break;
				  
			case SOUND_MIXER_OUTSRC:
				ret = devc->outmask;
				break;
				  
			case SOUND_MIXER_DEVMASK:
				ret = devc->supported_devices;
				break;
				  
			case SOUND_MIXER_STEREODEVS:
				ret = devc->supported_devices;
				/* The ESS seems to have stereo mic controls */
				if (devc->model == MDL_ESS)
					ret &= ~(SOUND_MASK_SPEAKER|SOUND_MASK_IMIX);
				else if (devc->model != MDL_JAZZ && devc->model != MDL_SMW)
					ret &= ~(SOUND_MASK_MIC | SOUND_MASK_SPEAKER | SOUND_MASK_IMIX);
				break;
				  
			case SOUND_MIXER_RECMASK:
				ret = devc->supported_rec_devices;
				break;
				  
			case SOUND_MIXER_OUTMASK:
				ret = devc->supported_out_devices;
				break;
				  
			case SOUND_MIXER_CAPS:
				ret = devc->mixer_caps;
				break;
				    
			default:
				ret = sb_mixer_get(devc, cmd & 0xff);
				break;
		}
		return put_user(ret, (int *)arg); 
	} else
		return -EINVAL;
}

static struct mixer_operations sb_mixer_operations =
{
	"SB",
	"Sound Blaster",
	sb_mixer_ioctl
};

static struct mixer_operations als007_mixer_operations =
{
	"ALS007",
	"Avance ALS-007",
	sb_mixer_ioctl
};

static void sb_mixer_reset(sb_devc * devc)
{
	char name[32];
	int i;
	extern int sm_games;

	sprintf(name, "SB_%d", devc->sbmixnum);

	if (sm_games)
		devc->levels = load_mixer_volumes(name, smg_default_levels, 1);
	else
		devc->levels = load_mixer_volumes(name, sb_default_levels, 1);

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
		sb_mixer_set(devc, i, devc->levels[i]);

	if (devc->model != MDL_ESS || !ess_mixer_reset (devc)) {
		set_recmask(devc, SOUND_MASK_MIC);
	};
}

int sb_mixer_init(sb_devc * devc)
{
	int mixer_type = 0;
	int m;

	devc->sbmixnum = sbmixnum++;
	devc->levels = NULL;

	sb_setmixer(devc, 0x00, 0);	/* Reset mixer */

	if (!(mixer_type = detect_mixer(devc)))
		return 0;	/* No mixer. Why? */

	switch (devc->model)
	{
		case MDL_ESSPCI:
		case MDL_YMPCI:
		case MDL_SBPRO:
		case MDL_AZTECH:
		case MDL_JAZZ:
			devc->mixer_caps = SOUND_CAP_EXCL_INPUT;
			devc->supported_devices = SBPRO_MIXER_DEVICES;
			devc->supported_rec_devices = SBPRO_RECORDING_DEVICES;
			devc->iomap = &sbpro_mix;
			break;

		case MDL_ESS:
			ess_mixer_init (devc);
			break;

		case MDL_SMW:
			devc->mixer_caps = SOUND_CAP_EXCL_INPUT;
			devc->supported_devices = 0;
			devc->supported_rec_devices = 0;
			devc->iomap = &sbpro_mix;
			smw_mixer_init(devc);
			break;

		case MDL_SB16:
			devc->mixer_caps = 0;
			devc->supported_rec_devices = SB16_RECORDING_DEVICES;
			devc->supported_out_devices = SB16_OUTFILTER_DEVICES;
			if (devc->submodel != SUBMDL_ALS007)
			{
				devc->supported_devices = SB16_MIXER_DEVICES;
				devc->iomap = &sb16_mix;
			}
			else
			{
				devc->supported_devices = ALS007_MIXER_DEVICES;
				devc->iomap = &als007_mix;
			}
			break;

		default:
			printk(KERN_WARNING "sb_mixer: Unsupported mixer type %d\n", devc->model);
			return 0;
	}

	m = sound_alloc_mixerdev();
	if (m == -1)
		return 0;

	mixer_devs[m] = (struct mixer_operations *)kmalloc(sizeof(struct mixer_operations), GFP_KERNEL);
	if (mixer_devs[m] == NULL)
	{
		printk(KERN_ERR "sb_mixer: Can't allocate memory\n");
		sound_unload_mixerdev(m);
		return 0;
	}

	if (devc->submodel != SUBMDL_ALS007)
		memcpy ((char *) mixer_devs[m], (char *) &sb_mixer_operations, sizeof (struct mixer_operations));
	else
		memcpy ((char *) mixer_devs[m], (char *) &als007_mixer_operations, sizeof (struct mixer_operations));

	mixer_devs[m]->devc = devc;
	devc->my_mixerdev = m;
	sb_mixer_reset(devc);
	return 1;
}

#endif