[linux.git] / sound / oss / v_midi.c

/*
 * sound/oss/v_midi.c
 *
 * The low level driver for the Sound Blaster DS chips.
 *
 *
 * Copyright (C) by Hannu Savolainen 1993-1996
 *
 * USS/Lite for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 * ??
 *
 * Changes
 *	Alan Cox		Modularisation, changed memory allocations
 *	Christoph Hellwig	Adapted to module_init/module_exit
 *
 * Status
 *	Untested
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include "sound_config.h"

#include "v_midi.h"

static vmidi_devc *v_devc[2] = { NULL, NULL};
static int midi1,midi2;
static void *midi_mem = NULL;

/*
 * The DSP channel can be used either for input or output. Variable
 * 'sb_irq_mode' will be set when the program calls read or write first time
 * after open. Current version doesn't support mode changes without closing
 * and reopening the device. Support for this feature may be implemented in a
 * future version of this driver.
 */


static int v_midi_open (int dev, int mode,
	      void            (*input) (int dev, unsigned char data),
	      void            (*output) (int dev)
)
{
	vmidi_devc *devc = midi_devs[dev]->devc;
	unsigned long flags;

	if (devc == NULL)
		return -(ENXIO);

	spin_lock_irqsave(&devc->lock,flags);
	if (devc->opened)
	{
		spin_unlock_irqrestore(&devc->lock,flags);
		return -(EBUSY);
	}
	devc->opened = 1;
	spin_unlock_irqrestore(&devc->lock,flags);

	devc->intr_active = 1;

	if (mode & OPEN_READ)
	{
		devc->input_opened = 1;
		devc->midi_input_intr = input;
	}

	return 0;
}

static void v_midi_close (int dev)
{
	vmidi_devc *devc = midi_devs[dev]->devc;
	unsigned long flags;

	if (devc == NULL)
		return;

	spin_lock_irqsave(&devc->lock,flags);
	devc->intr_active = 0;
	devc->input_opened = 0;
	devc->opened = 0;
	spin_unlock_irqrestore(&devc->lock,flags);
}

static int v_midi_out (int dev, unsigned char midi_byte)
{
	vmidi_devc *devc = midi_devs[dev]->devc;
	vmidi_devc *pdevc;

	if (devc == NULL)
		return -ENXIO;

	pdevc = midi_devs[devc->pair_mididev]->devc;
	if (pdevc->input_opened > 0){
		if (MIDIbuf_avail(pdevc->my_mididev) > 500)
			return 0;
		pdevc->midi_input_intr (pdevc->my_mididev, midi_byte);
	}
	return 1;
}

static inline int v_midi_start_read (int dev)
{
	return 0;
}

static int v_midi_end_read (int dev)
{
	vmidi_devc *devc = midi_devs[dev]->devc;
	if (devc == NULL)
		return -ENXIO;

	devc->intr_active = 0;
	return 0;
}

/* why -EPERM and not -EINVAL?? */

static inline int v_midi_ioctl (int dev, unsigned cmd, void __user *arg)
{
	return -EPERM;
}


#define MIDI_SYNTH_NAME	"Loopback MIDI"
#define MIDI_SYNTH_CAPS	SYNTH_CAP_INPUT

#include "midi_synth.h"

static struct midi_operations v_midi_operations =
{
	.owner		= THIS_MODULE,
	.info		= {"Loopback MIDI Port 1", 0, 0, SNDCARD_VMIDI},
	.converter	= &std_midi_synth,
	.in_info	= {0},
	.open		= v_midi_open,
	.close		= v_midi_close,
	.ioctl		= v_midi_ioctl,
	.outputc	= v_midi_out,
	.start_read	= v_midi_start_read,
	.end_read	= v_midi_end_read,
};

static struct midi_operations v_midi_operations2 =
{
	.owner		= THIS_MODULE,
	.info		= {"Loopback MIDI Port 2", 0, 0, SNDCARD_VMIDI},
	.converter	= &std_midi_synth,
	.in_info	= {0},
	.open		= v_midi_open,
	.close		= v_midi_close,
	.ioctl		= v_midi_ioctl,
	.outputc	= v_midi_out,
	.start_read	= v_midi_start_read,
	.end_read	= v_midi_end_read,
};

/*
 *	We kmalloc just one of these - it makes life simpler and the code
 *	cleaner and the memory handling far more efficient
 */
 
struct vmidi_memory
{
	/* Must be first */
	struct midi_operations m_ops[2];
	struct synth_operations s_ops[2];
	struct vmidi_devc v_ops[2];
};

static void __init attach_v_midi (struct address_info *hw_config)
{
	struct vmidi_memory *m;
	/* printk("Attaching v_midi device.....\n"); */

	midi1 = sound_alloc_mididev();
	if (midi1 == -1)
	{
		printk(KERN_ERR "v_midi: Too many midi devices detected\n");
		return;
	}
	
	m=(struct vmidi_memory *)kmalloc(sizeof(struct vmidi_memory), GFP_KERNEL);
	if (m == NULL)
	{
		printk(KERN_WARNING "Loopback MIDI: Failed to allocate memory\n");
		sound_unload_mididev(midi1);
		return;
	}
	
	midi_mem = m;
	
	midi_devs[midi1] = &m->m_ops[0];
	

	midi2 = sound_alloc_mididev();
	if (midi2 == -1)
	{
		printk (KERN_ERR "v_midi: Too many midi devices detected\n");
		kfree(m);
		sound_unload_mididev(midi1);
		return;
	}

	midi_devs[midi2] = &m->m_ops[1];

	/* printk("VMIDI1: %d   VMIDI2: %d\n",midi1,midi2); */

	/* for MIDI-1 */
	v_devc[0] = &m->v_ops[0];
	memcpy ((char *) midi_devs[midi1], (char *) &v_midi_operations,
		sizeof (struct midi_operations));

	v_devc[0]->my_mididev = midi1;
	v_devc[0]->pair_mididev = midi2;
	v_devc[0]->opened = v_devc[0]->input_opened = 0;
	v_devc[0]->intr_active = 0;
	v_devc[0]->midi_input_intr = NULL;
	spin_lock_init(&v_devc[0]->lock);

	midi_devs[midi1]->devc = v_devc[0];

	midi_devs[midi1]->converter = &m->s_ops[0];
	std_midi_synth.midi_dev = midi1;
	memcpy ((char *) midi_devs[midi1]->converter, (char *) &std_midi_synth,
		sizeof (struct synth_operations));
	midi_devs[midi1]->converter->id = "V_MIDI 1";

	/* for MIDI-2 */
	v_devc[1] = &m->v_ops[1];

	memcpy ((char *) midi_devs[midi2], (char *) &v_midi_operations2,
		sizeof (struct midi_operations));

	v_devc[1]->my_mididev = midi2;
	v_devc[1]->pair_mididev = midi1;
	v_devc[1]->opened = v_devc[1]->input_opened = 0;
	v_devc[1]->intr_active = 0;
	v_devc[1]->midi_input_intr = NULL;
	spin_lock_init(&v_devc[1]->lock);

	midi_devs[midi2]->devc = v_devc[1];
	midi_devs[midi2]->converter = &m->s_ops[1];

	std_midi_synth.midi_dev = midi2;
	memcpy ((char *) midi_devs[midi2]->converter, (char *) &std_midi_synth,
		sizeof (struct synth_operations));
	midi_devs[midi2]->converter->id = "V_MIDI 2";

	sequencer_init();
	/* printk("Attached v_midi device\n"); */
}

static inline int __init probe_v_midi(struct address_info *hw_config)
{
	return(1);	/* always OK */
}


static void __exit unload_v_midi(struct address_info *hw_config)
{
	sound_unload_mididev(midi1);
	sound_unload_mididev(midi2);
	kfree(midi_mem);
}

static struct address_info cfg; /* dummy */

static int __init init_vmidi(void)
{
	printk("MIDI Loopback device driver\n");
	if (!probe_v_midi(&cfg))
		return -ENODEV;
	attach_v_midi(&cfg);

	return 0;
}

static void __exit cleanup_vmidi(void)
{
	unload_v_midi(&cfg);
}

module_init(init_vmidi);
module_exit(cleanup_vmidi);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
f30c2269	2	* sound/oss/v_midi.c
1da177e4 LT	3	*
	4	* The low level driver for the Sound Blaster DS chips.
	5	*
	6	*
	7	* Copyright (C) by Hannu Savolainen 1993-1996
	8	*
	9	* USS/Lite for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
	10	* Version 2 (June 1991). See the "COPYING" file distributed with this software
	11	* for more info.
	12	* ??
	13	*
	14	* Changes
	15	* Alan Cox Modularisation, changed memory allocations
	16	* Christoph Hellwig Adapted to module_init/module_exit
	17	*
	18	* Status
	19	* Untested
	20	*/
	21
	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/spinlock.h>
	25	#include "sound_config.h"
	26
	27	#include "v_midi.h"
	28
	29	static vmidi_devc *v_devc[2] = { NULL, NULL};
	30	static int midi1,midi2;
	31	static void *midi_mem = NULL;
	32
	33	/*
	34	* The DSP channel can be used either for input or output. Variable
	35	* 'sb_irq_mode' will be set when the program calls read or write first time
	36	* after open. Current version doesn't support mode changes without closing
	37	* and reopening the device. Support for this feature may be implemented in a
	38	* future version of this driver.
	39	*/
	40
	41
1da177e4 LT	42	static int v_midi_open (int dev, int mode,
	43	void (*input) (int dev, unsigned char data),
	44	void (*output) (int dev)
	45	)
	46	{
	47	vmidi_devc *devc = midi_devs[dev]->devc;
	48	unsigned long flags;
	49
	50	if (devc == NULL)
	51	return -(ENXIO);
	52
	53	spin_lock_irqsave(&devc->lock,flags);
	54	if (devc->opened)
	55	{
	56	spin_unlock_irqrestore(&devc->lock,flags);
	57	return -(EBUSY);
	58	}
	59	devc->opened = 1;
	60	spin_unlock_irqrestore(&devc->lock,flags);
	61
	62	devc->intr_active = 1;
	63
	64	if (mode & OPEN_READ)
	65	{
	66	devc->input_opened = 1;
	67	devc->midi_input_intr = input;
	68	}
	69
	70	return 0;
	71	}
	72
	73	static void v_midi_close (int dev)
	74	{
	75	vmidi_devc *devc = midi_devs[dev]->devc;
	76	unsigned long flags;
	77
	78	if (devc == NULL)
	79	return;
	80
	81	spin_lock_irqsave(&devc->lock,flags);
	82	devc->intr_active = 0;
	83	devc->input_opened = 0;
	84	devc->opened = 0;
	85	spin_unlock_irqrestore(&devc->lock,flags);
	86	}
	87
	88	static int v_midi_out (int dev, unsigned char midi_byte)
	89	{
	90	vmidi_devc *devc = midi_devs[dev]->devc;
	91	vmidi_devc *pdevc;
	92
	93	if (devc == NULL)
	94	return -ENXIO;
	95
	96	pdevc = midi_devs[devc->pair_mididev]->devc;
	97	if (pdevc->input_opened > 0){
	98	if (MIDIbuf_avail(pdevc->my_mididev) > 500)
	99	return 0;
	100	pdevc->midi_input_intr (pdevc->my_mididev, midi_byte);
	101	}
	102	return 1;
	103	}
	104
	105	static inline int v_midi_start_read (int dev)
106	{
107	return 0;
108	}
109
110	static int v_midi_end_read (int dev)
111	{
112	vmidi_devc *devc = midi_devs[dev]->devc;
113	if (devc == NULL)
114	return -ENXIO;
115
116	devc->intr_active = 0;
117	return 0;
118	}
119
120	/* why -EPERM and not -EINVAL?? */
121
122	static inline int v_midi_ioctl (int dev, unsigned cmd, void __user *arg)
123	{
124	return -EPERM;
125	}
126
127
128	#define MIDI_SYNTH_NAME "Loopback MIDI"
129	#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
130
131	#include "midi_synth.h"
132
133	static struct midi_operations v_midi_operations =
134	{
135	.owner = THIS_MODULE,
136	.info = {"Loopback MIDI Port 1", 0, 0, SNDCARD_VMIDI},
137	.converter = &std_midi_synth,
138	.in_info = {0},
139	.open = v_midi_open,
140	.close = v_midi_close,
141	.ioctl = v_midi_ioctl,
142	.outputc = v_midi_out,
143	.start_read = v_midi_start_read,
144	.end_read = v_midi_end_read,
145	};
146
147	static struct midi_operations v_midi_operations2 =
148	{
149	.owner = THIS_MODULE,
150	.info = {"Loopback MIDI Port 2", 0, 0, SNDCARD_VMIDI},
151	.converter = &std_midi_synth,
152	.in_info = {0},
153	.open = v_midi_open,
154	.close = v_midi_close,
155	.ioctl = v_midi_ioctl,
156	.outputc = v_midi_out,
157	.start_read = v_midi_start_read,
158	.end_read = v_midi_end_read,
159	};
160
161	/*
162	* We kmalloc just one of these - it makes life simpler and the code
163	* cleaner and the memory handling far more efficient
164	*/
165
166	struct vmidi_memory
167	{
168	/* Must be first */
169	struct midi_operations m_ops[2];
170	struct synth_operations s_ops[2];
171	struct vmidi_devc v_ops[2];
172	};
173
174	static void __init attach_v_midi (struct address_info *hw_config)
175	{
176	struct vmidi_memory *m;
177	/* printk("Attaching v_midi device.....\n"); */
178
179	midi1 = sound_alloc_mididev();
180	if (midi1 == -1)
181	{
182	printk(KERN_ERR "v_midi: Too many midi devices detected\n");
183	return;
184	}
185
186	m=(struct vmidi_memory *)kmalloc(sizeof(struct vmidi_memory), GFP_KERNEL);
187	if (m == NULL)
188	{
189	printk(KERN_WARNING "Loopback MIDI: Failed to allocate memory\n");
190	sound_unload_mididev(midi1);
191	return;
192	}
193
194	midi_mem = m;
195
196	midi_devs[midi1] = &m->m_ops[0];
197
198
199	midi2 = sound_alloc_mididev();
200	if (midi2 == -1)
201	{
202	printk (KERN_ERR "v_midi: Too many midi devices detected\n");
203	kfree(m);
204	sound_unload_mididev(midi1);
205	return;
206	}
207
208	midi_devs[midi2] = &m->m_ops[1];
209
210	/* printk("VMIDI1: %d VMIDI2: %d\n",midi1,midi2); */
211
212	/* for MIDI-1 */
213	v_devc[0] = &m->v_ops[0];
214	memcpy ((char ) midi_devs[midi1], (char ) &v_midi_operations,
215	sizeof (struct midi_operations));
216
217	v_devc[0]->my_mididev = midi1;
218	v_devc[0]->pair_mididev = midi2;
219	v_devc[0]->opened = v_devc[0]->input_opened = 0;
220	v_devc[0]->intr_active = 0;
221	v_devc[0]->midi_input_intr = NULL;
222	spin_lock_init(&v_devc[0]->lock);
223
224	midi_devs[midi1]->devc = v_devc[0];
225
226	midi_devs[midi1]->converter = &m->s_ops[0];
227	std_midi_synth.midi_dev = midi1;
228	memcpy ((char ) midi_devs[midi1]->converter, (char ) &std_midi_synth,
229	sizeof (struct synth_operations));
230	midi_devs[midi1]->converter->id = "V_MIDI 1";
231
232	/* for MIDI-2 */
233	v_devc[1] = &m->v_ops[1];
234
235	memcpy ((char ) midi_devs[midi2], (char ) &v_midi_operations2,
236	sizeof (struct midi_operations));
237
238	v_devc[1]->my_mididev = midi2;
239	v_devc[1]->pair_mididev = midi1;
240	v_devc[1]->opened = v_devc[1]->input_opened = 0;
241	v_devc[1]->intr_active = 0;
242	v_devc[1]->midi_input_intr = NULL;
243	spin_lock_init(&v_devc[1]->lock);
244
245	midi_devs[midi2]->devc = v_devc[1];
246	midi_devs[midi2]->converter = &m->s_ops[1];
247
248	std_midi_synth.midi_dev = midi2;
249	memcpy ((char ) midi_devs[midi2]->converter, (char ) &std_midi_synth,
250	sizeof (struct synth_operations));
251	midi_devs[midi2]->converter->id = "V_MIDI 2";
252
253	sequencer_init();
254	/* printk("Attached v_midi device\n"); */
255	}
256
257	static inline int __init probe_v_midi(struct address_info *hw_config)
258	{
259	return(1); /* always OK */
260	}
261
262
263	static void __exit unload_v_midi(struct address_info *hw_config)
264	{
265	sound_unload_mididev(midi1);
266	sound_unload_mididev(midi2);
267	kfree(midi_mem);
268	}
269
270	static struct address_info cfg; /* dummy */
271
272	static int __init init_vmidi(void)
273	{
274	printk("MIDI Loopback device driver\n");
275	if (!probe_v_midi(&cfg))
276	return -ENODEV;
277	attach_v_midi(&cfg);
278
279	return 0;
280	}
281
282	static void __exit cleanup_vmidi(void)
283	{
284	unload_v_midi(&cfg);
285	}
286
287	module_init(init_vmidi);
288	module_exit(cleanup_vmidi);
289	MODULE_LICENSE("GPL");