aboutsummaryrefslogtreecommitdiffstats
path: root/package/fonera-mp3-drv/src/mp3_drv.c
blob: a2d8c79ae64a330152d604376e8b04a7ab43c481 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/*
* a.lp_mp3 - VS1011B driver for Fonera 
* Copyright (c) 2007 phrozen.org - John Crispin <john@phrozen.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA
*
* Feedback, Bugs...  john@phrozen.org 
*
*/


#include <linux/module.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/genhd.h>
#include <linux/device.h> 

// do we want debuging info ?
#if 0
#define DBG(x) x
#else
#define DBG(x) 
#endif

#define MP3_CHUNK_SIZE 			4096
#define MP3_BUFFERING			0
#define MP3_PLAYING			1
#define MP3_BUFFER_FINISHED		2
#define MP3_PLAY_FINISHED		3
typedef struct _MP3_DATA{
	unsigned char 	mp3[MP3_CHUNK_SIZE];
	unsigned char state;
} MP3_DATA;

#define IOCTL_MP3_INIT			0x01
#define IOCTL_MP3_RESET			0x02
#define IOCTL_MP3_SETVOLUME		0x03
#define IOCTL_MP3_GETVOLUME		0x04

typedef struct _AUDIO_DATA{
	unsigned int bitrate;
	unsigned int sample_rate;
	unsigned char is_stereo;
}AUDIO_DATA;
#define IOCTL_MP3_GETAUDIODATA		0x05
#define IOCTL_MP3_CLEARBUFFER		0x06
#define IOCTL_MP3_PLAY			0x07

typedef struct _MP3_BEEP{
	unsigned char 	freq;
	unsigned int	ms;
} MP3_BEEP;
#define IOCTL_MP3_BEEP			0x08			
#define IOCTL_MP3_END_REACHED		0x09
#define IOCTL_MP3_BASS			0x10

#define CRYSTAL12288	0x9800
#define CRYSTAL24576	0x0

#define DEV_NAME 			"mp3"
#define DEV_MAJOR 			196
#define MAX_MP3_COUNT 	1

typedef struct _mp3_inf{
	unsigned char is_open;
} mp3_inf;
static mp3_inf mp3_info[MAX_MP3_COUNT];

#define MP3_BUFFER_SIZE		(128 * 1024)
unsigned char mp3_buffer[MP3_BUFFER_SIZE];

static unsigned long int mp3_buffer_offset_write = 0;
static unsigned long int mp3_buffer_offset_read = 0;
static unsigned char mp3_buffering_status = MP3_BUFFERING;
static unsigned long int mp3_data_in_buffer = 0;
static int mp3_thread = 0;
unsigned int crystal_freq;

#include "vs10xx.c"

static wait_queue_head_t wq;
static DECLARE_COMPLETION(mp3_exit);

static int mp3_playback_thread(void *data){
	int j;
	unsigned long timeout;
	unsigned char empty = 0;
	printk("started kthread\n");
	daemonize("kmp3");
	while(mp3_buffering_status != MP3_PLAY_FINISHED){
		if((mp3_buffering_status == MP3_PLAYING) || (mp3_buffering_status == MP3_BUFFER_FINISHED)){
			while((VS1011_NEEDS_DATA) && (!empty)){
				if(mp3_buffer_offset_read == MP3_BUFFER_SIZE){
					mp3_buffer_offset_read = 0;
				}
				
				if(mp3_data_in_buffer == 0){
					if(mp3_buffering_status == MP3_BUFFER_FINISHED){
						printk("mp3_drv.ko : finished playing\n");
						mp3_buffering_status = MP3_PLAY_FINISHED;
					} else {
						empty = 1;
						printk("mp3_drv.ko : buffer empty ?\n");
						if(mp3_buffering_status != MP3_PLAY_FINISHED){
						}
					}
				} else {
					for(j = 0; j < 32; j++){
						VS1011_send_SDI(mp3_buffer[mp3_buffer_offset_read + j]);
					}
					mp3_buffer_offset_read += 32;
					mp3_data_in_buffer -= 32;
				}
			}
		}
		empty = 0;
		timeout = 1;	
       	timeout = wait_event_interruptible_timeout(wq, (timeout==0), timeout);	
	}
	complete_and_exit(&mp3_exit, 0); 
}

static ssize_t module_write(struct file * file, const char * buffer, size_t count, loff_t *offset){
	MP3_DATA mp3_data;
	
	copy_from_user((char*) &mp3_data, buffer, sizeof(MP3_DATA));
	
	if(mp3_data.state == MP3_BUFFER_FINISHED){
		mp3_buffering_status = MP3_BUFFER_FINISHED;
		DBG(printk("mp3_drv.ko : file end reached\n"));
		return 1;
	}
	
	if(mp3_data.state == MP3_PLAY_FINISHED){
		mp3_buffering_status = MP3_PLAY_FINISHED;
		mp3_data_in_buffer = 0;
		DBG(printk("mp3_drv.ko : stop playing\n"));
		return 1;
	}
	
	if(mp3_data_in_buffer + MP3_CHUNK_SIZE >= MP3_BUFFER_SIZE){
		DBG(printk("mp3_drv.ko : buffer is full? %ld\n", mp3_data_in_buffer);)
		return 0;
	}
	
	if(mp3_buffer_offset_write == MP3_BUFFER_SIZE){
		mp3_buffer_offset_write = 0;
	}
	
	memcpy(&mp3_buffer[mp3_buffer_offset_write], mp3_data.mp3, MP3_CHUNK_SIZE);
	mp3_buffer_offset_write += MP3_CHUNK_SIZE;
	mp3_buffering_status = mp3_data.state;
	mp3_data_in_buffer += MP3_CHUNK_SIZE;
	return 1;
}

static int module_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg){
	unsigned int 	retval = 0;
	AUDIO_DATA   	audio_data;
	MP3_BEEP	mp3_beep;
	DBG(printk("mp3_drv.ko : Ioctl Called (cmd=%d)\n", cmd );)
	switch (cmd) {
		case IOCTL_MP3_INIT:
			crystal_freq = arg;
			VS1011_init(crystal_freq, 1);
			VS1011_print_registers();
			break;

		case IOCTL_MP3_RESET:
			DBG(printk("mp3_drv.ko : doing a sw reset\n");)
			VS1011_init(crystal_freq, 0);
			VS1011_print_registers();
			VS1011_send_zeros(0x20);
			break;

		case IOCTL_MP3_SETVOLUME:
			DBG(printk("mp3_drv.ko : setting volume to : %lu\n", arg&0xffff);)
			VS1011_set_volume(arg);
			break;

		case IOCTL_MP3_GETVOLUME:
			retval = VS1011_get_volume();
			DBG(printk("mp3_drv.ko : read volume : %d\n", retval);)
			break;

		case IOCTL_MP3_GETAUDIODATA:
			DBG(printk("mp3_drv.ko : read audio data\n");)
			VS1011_get_audio_data(&audio_data);
			copy_to_user((char*)arg, (char*)&audio_data, sizeof(AUDIO_DATA));
			break;

		case IOCTL_MP3_CLEARBUFFER:
			DBG(printk("mp3_drv.ko : clearing buffer\n");)
			mp3_buffer_offset_read = 0;
			mp3_buffer_offset_write = 0;
			mp3_buffering_status = MP3_PLAY_FINISHED;
			mp3_data_in_buffer = 0;
			break;

		case IOCTL_MP3_PLAY:
			mp3_thread = kernel_thread(mp3_playback_thread, NULL, CLONE_KERNEL);
			break;

		case IOCTL_MP3_BEEP:
			copy_from_user((char*)&mp3_beep, (char*)arg, sizeof(MP3_BEEP));
			VS1011_sine(1,mp3_beep.freq);
			msDelay(mp3_beep.ms);
			VS1011_sine(0,0);
			break;

		case IOCTL_MP3_END_REACHED:
			if(mp3_buffering_status == MP3_PLAY_FINISHED){
				retval = 1;
			}
			break;

		case IOCTL_MP3_BASS:
			VS1011_set_bass(arg);
			break;

		default:
			printk("mp3_drv.ko : unknown ioctl\n");
			break;

	}
	return retval;
}

static int module_open(struct inode *inode, struct file *file){
	unsigned int dev_minor = MINOR(inode->i_rdev);
	if(dev_minor !=  0){
		printk("mp3_drv.ko : trying to access unknown minor device -> %d\n", dev_minor);
		return -ENODEV;
	}
	if(mp3_info[dev_minor].is_open) {
		printk("mp3_drv.ko : Device with minor ID %d already in use\n", dev_minor);
		return -EBUSY;
	}
	mp3_info[dev_minor].is_open = 1;
	
	mp3_buffering_status = MP3_PLAY_FINISHED;
	printk("mp3_drv.ko : Minor %d has been opened\n", dev_minor);
	return 0;
}

static int module_close(struct inode * inode, struct file * file){
	unsigned int dev_minor = MINOR(inode->i_rdev);
	mp3_info[dev_minor].is_open = 0;
	printk("mp3_drv.ko : Minor %d has been closed\n", dev_minor);
	mp3_buffering_status = MP3_PLAY_FINISHED;
	return 0;
}

struct file_operations modulemp3_fops = {
        write:         module_write,
        ioctl:         module_ioctl,
        open:          module_open,
        release:       module_close
};

static struct class *mp3_class; 

static int __init mod_init(void){
	printk("mp3_drv.ko : VS1011b Driver\n");
	printk("mp3_drv.ko : Made by John '2B|!2B' Crispin (john@phrozen.org)\n");
	printk("mp3_drv.ko : Starting ...\n");
	
	if(register_chrdev(DEV_MAJOR, DEV_NAME, &modulemp3_fops)) {
		printk( "mp3_drv.ko : Error whilst opening %s (%d)\n", DEV_NAME, DEV_MAJOR);
		return( -ENODEV );
	}

	printk("mp3_drv.ko : using sysfs to create device nodes\n");
	mp3_class = class_create(THIS_MODULE, DEV_NAME); 
	class_device_create(mp3_class, NULL, 
		MKDEV(DEV_MAJOR, 0), 
		NULL, DEV_NAME); 

	mp3_info[0].is_open = 0;
	printk("mp3_drv.ko : Device %s registered for major ID %d\n", DEV_NAME, DEV_MAJOR);
	crystal_freq = CRYSTAL12288;
	VS1011_init(crystal_freq, 1);
	VS1011_print_registers();
	printk("end of init\n");
	init_waitqueue_head(&wq);
	printk("wait queue started\n");
	return 0;
}

static void __exit mod_exit(void){
	printk( "mp3_drv.ko : Cleanup\n" );
	unregister_chrdev(DEV_MAJOR, DEV_NAME);
}

module_init (mod_init);
module_exit (mod_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("K. John '2B|!2B' Crispin");
MODULE_DESCRIPTION("vs1011 Driver for Fox Board");