esssolo1.c

讲述linux的初始化过程

		spin_lock_irqsave(&s->lock, flags);
		ptr = s->midi.owr;
		cnt = MIDIOUTBUF - ptr;
		if (s->midi.ocnt + cnt > MIDIOUTBUF)
			cnt = MIDIOUTBUF - s->midi.ocnt;
		if (cnt <= 0) {
			__set_current_state(TASK_INTERRUPTIBLE);
			solo1_handle_midi(s);
		}
		spin_unlock_irqrestore(&s->lock, flags);
		if (cnt > count)
			cnt = count;
		if (cnt <= 0) {
			if (file->f_flags & O_NONBLOCK) {
				if (!ret)
					ret = -EAGAIN;
				break;
			}
			schedule();
			if (signal_pending(current)) {
				if (!ret)
					ret = -ERESTARTSYS;
				break;
			}
			continue;
		}
		if (copy_from_user(s->midi.obuf + ptr, buffer, cnt)) {
			if (!ret)
				ret = -EFAULT;
			break;
		}
		ptr = (ptr + cnt) % MIDIOUTBUF;
		spin_lock_irqsave(&s->lock, flags);
		s->midi.owr = ptr;
		s->midi.ocnt += cnt;
		spin_unlock_irqrestore(&s->lock, flags);
		count -= cnt;
		buffer += cnt;
		ret += cnt;
		spin_lock_irqsave(&s->lock, flags);
		solo1_handle_midi(s);
		spin_unlock_irqrestore(&s->lock, flags);
	}
	__set_current_state(TASK_RUNNING);
	remove_wait_queue(&s->midi.owait, &wait);
	return ret;
}

/* No kernel lock - we have our own spinlock */
static unsigned int solo1_midi_poll(struct file *file, struct poll_table_struct *wait)
{
	struct solo1_state *s = (struct solo1_state *)file->private_data;
	unsigned long flags;
	unsigned int mask = 0;

	VALIDATE_STATE(s);
	if (file->f_flags & FMODE_WRITE)
		poll_wait(file, &s->midi.owait, wait);
	if (file->f_flags & FMODE_READ)
		poll_wait(file, &s->midi.iwait, wait);
	spin_lock_irqsave(&s->lock, flags);
	if (file->f_flags & FMODE_READ) {
		if (s->midi.icnt > 0)
			mask |= POLLIN | POLLRDNORM;
	}
	if (file->f_flags & FMODE_WRITE) {
		if (s->midi.ocnt < MIDIOUTBUF)
			mask |= POLLOUT | POLLWRNORM;
	}
	spin_unlock_irqrestore(&s->lock, flags);
	return mask;
}

static int solo1_midi_open(struct inode *inode, struct file *file)
{
	int minor = MINOR(inode->i_rdev);
	DECLARE_WAITQUEUE(wait, current);
	unsigned long flags;
	struct list_head *list;
	struct solo1_state *s;

	for (list = devs.next; ; list = list->next) {
		if (list == &devs)
			return -ENODEV;
		s = list_entry(list, struct solo1_state, devs);
		if (s->dev_midi == minor)
			break;
	}
       	VALIDATE_STATE(s);
	file->private_data = s;
	/* wait for device to become free */
	down(&s->open_sem);
	while (s->open_mode & (file->f_mode << FMODE_MIDI_SHIFT)) {
		if (file->f_flags & O_NONBLOCK) {
			up(&s->open_sem);
			return -EBUSY;
		}
		add_wait_queue(&s->open_wait, &wait);
		__set_current_state(TASK_INTERRUPTIBLE);
		up(&s->open_sem);
		schedule();
		remove_wait_queue(&s->open_wait, &wait);
		set_current_state(TASK_RUNNING);
		if (signal_pending(current))
			return -ERESTARTSYS;
		down(&s->open_sem);
	}
	spin_lock_irqsave(&s->lock, flags);
	if (!(s->open_mode & (FMODE_MIDI_READ | FMODE_MIDI_WRITE))) {
		s->midi.ird = s->midi.iwr = s->midi.icnt = 0;
		s->midi.ord = s->midi.owr = s->midi.ocnt = 0;
		outb(0xff, s->mpubase+1); /* reset command */
		outb(0x3f, s->mpubase+1); /* uart command */
		if (!(inb(s->mpubase+1) & 0x80))
			inb(s->mpubase);
		s->midi.ird = s->midi.iwr = s->midi.icnt = 0;
		outb(0xb0, s->iobase + 7); /* enable A1, A2, MPU irq's */
		init_timer(&s->midi.timer);
		s->midi.timer.expires = jiffies+1;
		s->midi.timer.data = (unsigned long)s;
		s->midi.timer.function = solo1_midi_timer;
		add_timer(&s->midi.timer);
	}
	if (file->f_mode & FMODE_READ) {
		s->midi.ird = s->midi.iwr = s->midi.icnt = 0;
	}
	if (file->f_mode & FMODE_WRITE) {
		s->midi.ord = s->midi.owr = s->midi.ocnt = 0;
	}
	spin_unlock_irqrestore(&s->lock, flags);
	s->open_mode |= (file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE);
	up(&s->open_sem);
	return 0;
}

static int solo1_midi_release(struct inode *inode, struct file *file)
{
	struct solo1_state *s = (struct solo1_state *)file->private_data;
	DECLARE_WAITQUEUE(wait, current);
	unsigned long flags;
	unsigned count, tmo;

	VALIDATE_STATE(s);

	lock_kernel();
	if (file->f_mode & FMODE_WRITE) {
		add_wait_queue(&s->midi.owait, &wait);
		for (;;) {
			__set_current_state(TASK_INTERRUPTIBLE);
			spin_lock_irqsave(&s->lock, flags);
			count = s->midi.ocnt;
			spin_unlock_irqrestore(&s->lock, flags);
			if (count <= 0)
				break;
			if (signal_pending(current))
				break;
			if (file->f_flags & O_NONBLOCK) {
				remove_wait_queue(&s->midi.owait, &wait);
				set_current_state(TASK_RUNNING);
				return -EBUSY;
			}
			tmo = (count * HZ) / 3100;
			if (!schedule_timeout(tmo ? : 1) && tmo)
				printk(KERN_DEBUG "solo1: midi timed out??\n");
		}
		remove_wait_queue(&s->midi.owait, &wait);
		set_current_state(TASK_RUNNING);
	}
	down(&s->open_sem);
	s->open_mode &= (~(file->f_mode << FMODE_MIDI_SHIFT)) & (FMODE_MIDI_READ|FMODE_MIDI_WRITE);
	spin_lock_irqsave(&s->lock, flags);
	if (!(s->open_mode & (FMODE_MIDI_READ | FMODE_MIDI_WRITE))) {
		outb(0x30, s->iobase + 7); /* enable A1, A2 irq's */
		del_timer(&s->midi.timer);		
	}
	spin_unlock_irqrestore(&s->lock, flags);
	wake_up(&s->open_wait);
	up(&s->open_sem);
	unlock_kernel();
	return 0;
}

static /*const*/ struct file_operations solo1_midi_fops = {
	owner:		THIS_MODULE,
	llseek:		solo1_llseek,
	read:		solo1_midi_read,
	write:		solo1_midi_write,
	poll:		solo1_midi_poll,
	open:		solo1_midi_open,
	release:	solo1_midi_release,
};

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

static int solo1_dmfm_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	static const unsigned char op_offset[18] = {
		0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
		0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D,
		0x10, 0x11, 0x12, 0x13, 0x14, 0x15
	};
	struct solo1_state *s = (struct solo1_state *)file->private_data;
	struct dm_fm_voice v;
	struct dm_fm_note n;
	struct dm_fm_params p;
	unsigned int io;
	unsigned int regb;

	switch (cmd) {		
	case FM_IOCTL_RESET:
		for (regb = 0xb0; regb < 0xb9; regb++) {
			outb(regb, s->sbbase);
			outb(0, s->sbbase+1);
			outb(regb, s->sbbase+2);
			outb(0, s->sbbase+3);
		}
		return 0;

	case FM_IOCTL_PLAY_NOTE:
		if (copy_from_user(&n, (void *)arg, sizeof(n)))
			return -EFAULT;
		if (n.voice >= 18)
			return -EINVAL;
		if (n.voice >= 9) {
			regb = n.voice - 9;
			io = s->sbbase+2;
		} else {
			regb = n.voice;
			io = s->sbbase;
		}
		outb(0xa0 + regb, io);
		outb(n.fnum & 0xff, io+1);
		outb(0xb0 + regb, io);
		outb(((n.fnum >> 8) & 3) | ((n.octave & 7) << 2) | ((n.key_on & 1) << 5), io+1);
		return 0;

	case FM_IOCTL_SET_VOICE:
		if (copy_from_user(&v, (void *)arg, sizeof(v)))
			return -EFAULT;
		if (v.voice >= 18)
			return -EINVAL;
		regb = op_offset[v.voice];
		io = s->sbbase + ((v.op & 1) << 1);
		outb(0x20 + regb, io);
		outb(((v.am & 1) << 7) | ((v.vibrato & 1) << 6) | ((v.do_sustain & 1) << 5) | 
		     ((v.kbd_scale & 1) << 4) | (v.harmonic & 0xf), io+1);
		outb(0x40 + regb, io);
		outb(((v.scale_level & 0x3) << 6) | (v.volume & 0x3f), io+1);
		outb(0x60 + regb, io);
		outb(((v.attack & 0xf) << 4) | (v.decay & 0xf), io+1);
		outb(0x80 + regb, io);
		outb(((v.sustain & 0xf) << 4) | (v.release & 0xf), io+1);
		outb(0xe0 + regb, io);
		outb(v.waveform & 0x7, io+1);
		if (n.voice >= 9) {
			regb = n.voice - 9;
			io = s->sbbase+2;
		} else {
			regb = n.voice;
			io = s->sbbase;
		}
		outb(0xc0 + regb, io);
		outb(((v.right & 1) << 5) | ((v.left & 1) << 4) | ((v.feedback & 7) << 1) |
		     (v.connection & 1), io+1);
		return 0;
		
	case FM_IOCTL_SET_PARAMS:
		if (copy_from_user(&p, (void *)arg, sizeof(p)))
			return -EFAULT;
		outb(0x08, s->sbbase);
		outb((p.kbd_split & 1) << 6, s->sbbase+1);
		outb(0xbd, s->sbbase);
		outb(((p.am_depth & 1) << 7) | ((p.vib_depth & 1) << 6) | ((p.rhythm & 1) << 5) | ((p.bass & 1) << 4) |
		     ((p.snare & 1) << 3) | ((p.tomtom & 1) << 2) | ((p.cymbal & 1) << 1) | (p.hihat & 1), s->sbbase+1);
		return 0;

	case FM_IOCTL_SET_OPL:
		outb(4, s->sbbase+2);
		outb(arg, s->sbbase+3);
		return 0;

	case FM_IOCTL_SET_MODE:
		outb(5, s->sbbase+2);
		outb(arg & 1, s->sbbase+3);
		return 0;

	default:
		return -EINVAL;
	}
}

static int solo1_dmfm_open(struct inode *inode, struct file *file)
{
	int minor = MINOR(inode->i_rdev);
	DECLARE_WAITQUEUE(wait, current);
	struct list_head *list;
	struct solo1_state *s;

	for (list = devs.next; ; list = list->next) {
		if (list == &devs)
			return -ENODEV;
		s = list_entry(list, struct solo1_state, devs);
		if (s->dev_dmfm == minor)
			break;
	}
       	VALIDATE_STATE(s);
	file->private_data = s;
	/* wait for device to become free */
	down(&s->open_sem);
	while (s->open_mode & FMODE_DMFM) {
		if (file->f_flags & O_NONBLOCK) {
			up(&s->open_sem);
			return -EBUSY;
		}
		add_wait_queue(&s->open_wait, &wait);
		__set_current_state(TASK_INTERRUPTIBLE);
		up(&s->open_sem);
		schedule();
		remove_wait_queue(&s->open_wait, &wait);
		set_current_state(TASK_RUNNING);
		if (signal_pending(current))
			return -ERESTARTSYS;
		down(&s->open_sem);
	}
	if (!request_region(s->sbbase, FMSYNTH_EXTENT, "ESS Solo1")) {
		up(&s->open_sem);
		printk(KERN_ERR "solo1: FM synth io ports in use, opl3 loaded?\n");
		return -EBUSY;
	}
	/* init the stuff */
	outb(1, s->sbbase);
	outb(0x20, s->sbbase+1); /* enable waveforms */
	outb(4, s->sbbase+2);
	outb(0, s->sbbase+3);  /* no 4op enabled */
	outb(5, s->sbbase+2);
	outb(1, s->sbbase+3);  /* enable OPL3 */
	s->open_mode |= FMODE_DMFM;
	up(&s->open_sem);
	return 0;
}

static int solo1_dmfm_release(struct inode *inode, struct file *file)
{
	struct solo1_state *s = (struct solo1_state *)file->private_data;
	unsigned int regb;

	VALIDATE_STATE(s);
	lock_kernel();
	down(&s->open_sem);
	s->open_mode &= ~FMODE_DMFM;
	for (regb = 0xb0; regb < 0xb9; regb++) {
		outb(regb, s->sbbase);
		outb(0, s->sbbase+1);
		outb(regb, s->sbbase+2);
		outb(0, s->sbbase+3);
	}
	release_region(s->sbbase, FMSYNTH_EXTENT);
	wake_up(&s->open_wait);
	up(&s->open_sem);
	unlock_kernel();
	return 0;
}

static /*const*/ struct file_operations solo1_dmfm_fops = {
	owner:		THIS_MODULE,
	llseek:		solo1_llseek,
	ioctl:		solo1_dmfm_ioctl,
	open:		solo1_dmfm_open,
	release:	solo1_dmfm_release,
};

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

static struct initvol {
	int mixch;
	int vol;
} initvol[] __initdata = {
	{ SOUND_MIXER_WRITE_VOLUME, 0x4040 },
	{ SOUND_MIXER_WRITE_PCM, 0x4040 },
	{ SOUND_MIXER_WRITE_SYNTH, 0x4040 },
	{ SOUND_MIXER_WRITE_CD, 0x4040 },
	{ SOUND_MIXER_WRITE_LINE, 0x4040 },
	{ SOUND_MIXER_WRITE_LINE1, 0x4040 },
	{ SOUND_MIXER_WRITE_LINE2, 0x4040 },
	{ SOUND_MIXER_WRITE_RECLEV, 0x4040 },
	{ SOUND_MIXER_WRITE_SPEAKER, 0x4040 },
	{ SOUND_MIXER_WRITE_MIC, 0x4040 }
};

static int setup_solo1(struct solo1_state *s)
{
	struct pci_dev *pcidev = s->dev;
	mm_segment_t fs;
	int i, val;

	/* initialize DDMA base address */
	printk(KERN_DEBUG "solo1: ddma base address: 0x%lx\n", s->ddmabase);
	pci_write_config_word(pcidev, 0x60, (s->ddmabase & (~0xf)) | 1);
	/* set DMA policy to DDMA, IRQ emulation off (CLKRUN disabled for now) */
	pci_write_config_dword(pcidev, 0x50, 0);
	/* disable legacy audio address decode */
	pci_write_config_word(pcidev, 0x40, 0x907f);

	/* initialize the chips */
	if (!reset_ctrl(s)) {
		printk(KERN_ERR "esssolo1: cannot reset controller\n");
		return -1;
	}
	outb(0xb0, s->iobase+7); /* enable A1, A2, MPU irq's */
	
	/* initialize mixer regs */
	write_mixer(s, 0x7f, 0); /* disable music digital recording */
	write_mixer(s, 0x7d, 0x0c); /* enable mic preamp, MONO_OUT is 2nd DAC right channel */
	write_mixer(s, 0x64, 0x45); /* volume control */
	write_mixer(s, 0x48, 0x10); /* enable music DAC/ES6xx interface */
	write_mixer(s, 0x50, 0);  /* disable spatializer */
	write_mixer(s, 0x52, 0);
	write_mixer(s, 0x14, 0);  /* DAC1 minimum volume */
	write_mixer(s, 0x71, 0x20); /* enable new 0xA1 reg format */
	outb(0, s->ddmabase+0xd); /* DMA master clear */
	outb(1, s->ddmabase+0xf); /* mask channel */
	/*outb(0, s->ddmabase+0x8);*/ /* enable controller (enable is low active!!) */

	pci_set_master(pcidev);  /* enable bus mastering */
	
	fs = get_fs();
	set_fs(KERNEL_DS);
	val = SOUND_MASK_LINE;
	mixer_ioctl(s, SOUND_MIXER_WRITE_RECSRC, (unsigned long)&val);
	for (i = 0; i < sizeof(initvol)/sizeof(initvol[0]); i++) {
		val = initvol[i].vol;
		mixer_ioctl(s, initvol[i].mixch, (unsigned long)&val);
	}
	val = 1; /* enable mic preamp */
	mixer_ioctl(s, SOUND_MIXER_PRIVATE1, (unsigned long)&val);
	set_fs(fs);
	return 0;
}

static int solo1_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data)
{
	struct solo1_state *s