2 * a.lp_mp3 - VS1011B driver for Fonera
3 * Copyright (c) 2007 phrozen.org - John Crispin <john@phrozen.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA
19 * Feedback, Bugs... john@phrozen.org
24 #include <linux/module.h>
25 #include <linux/errno.h>
26 #include <linux/ioport.h>
27 #include <linux/init.h>
28 #include <asm/uaccess.h>
30 #include <linux/timer.h>
31 #include <linux/init.h>
32 #include <linux/genhd.h>
34 // do we want debuging info ?
41 #define MP3_CHUNK_SIZE 4096
42 #define MP3_BUFFERING 0
44 #define MP3_BUFFER_FINISHED 2
45 #define MP3_PLAY_FINISHED 3
46 typedef struct _MP3_DATA{
47 unsigned char mp3[MP3_CHUNK_SIZE];
51 #define IOCTL_MP3_INIT 0x01
52 #define IOCTL_MP3_RESET 0x02
53 #define IOCTL_MP3_SETVOLUME 0x03
54 #define IOCTL_MP3_GETVOLUME 0x04
56 typedef struct _AUDIO_DATA{
58 unsigned int sample_rate;
59 unsigned char is_stereo;
61 #define IOCTL_MP3_GETAUDIODATA 0x05
62 #define IOCTL_MP3_CLEARBUFFER 0x06
63 #define IOCTL_MP3_PLAY 0x07
65 typedef struct _MP3_BEEP{
69 #define IOCTL_MP3_BEEP 0x08
70 #define IOCTL_MP3_END_REACHED 0x09
71 #define IOCTL_MP3_BASS 0x10
73 #define CRYSTAL12288 0x9800
74 #define CRYSTAL24576 0x0
76 #define DEV_NAME "mp3"
78 #define MAX_MP3_COUNT 1
80 typedef struct _mp3_inf{
81 unsigned char is_open;
83 static mp3_inf mp3_info[MAX_MP3_COUNT];
85 #define MP3_BUFFER_SIZE (128 * 1024)
86 unsigned char mp3_buffer[MP3_BUFFER_SIZE];
88 static unsigned long int mp3_buffer_offset_write = 0;
89 static unsigned long int mp3_buffer_offset_read = 0;
90 static unsigned char mp3_buffering_status = MP3_BUFFERING;
91 static unsigned long int mp3_data_in_buffer = 0;
92 static int mp3_thread = 0;
93 unsigned int crystal_freq;
97 static wait_queue_head_t wq;
98 static DECLARE_COMPLETION(mp3_exit);
100 static int mp3_playback_thread(void *data){
102 unsigned long timeout;
103 printk("started kthread\n");
105 while(mp3_buffering_status != MP3_PLAY_FINISHED){
106 if((mp3_buffering_status == MP3_PLAYING) || (mp3_buffering_status == MP3_BUFFER_FINISHED)){
107 while(VS1011_NEEDS_DATA){
108 if(mp3_buffer_offset_read == MP3_BUFFER_SIZE){
109 mp3_buffer_offset_read = 0;
112 if(mp3_data_in_buffer == 0){
113 if(mp3_buffering_status == MP3_BUFFER_FINISHED){
114 printk("mp3_drv.ko : finished playing\n");
115 mp3_buffering_status = MP3_PLAY_FINISHED;
117 printk("mp3_drv.ko : buffer empty ?\n");
118 if(mp3_buffering_status != MP3_PLAY_FINISHED){
122 for(j = 0; j < 32; j++){
123 VS1011_send_SDI(mp3_buffer[mp3_buffer_offset_read + j]);
125 mp3_buffer_offset_read += 32;
126 mp3_data_in_buffer -= 32;
131 timeout = wait_event_interruptible_timeout(wq, (timeout==0), timeout);
133 complete_and_exit(&mp3_exit, 0);
136 static ssize_t module_write(struct file * file, const char * buffer, size_t count, loff_t *offset){
139 copy_from_user((char*) &mp3_data, buffer, sizeof(MP3_DATA));
141 if(mp3_data.state == MP3_BUFFER_FINISHED){
142 mp3_buffering_status = MP3_BUFFER_FINISHED;
143 DBG(printk("mp3_drv.ko : file end reached\n"));
147 if(mp3_data.state == MP3_PLAY_FINISHED){
148 mp3_buffering_status = MP3_PLAY_FINISHED;
149 mp3_data_in_buffer = 0;
150 DBG(printk("mp3_drv.ko : stop playing\n"));
154 if(mp3_data_in_buffer + MP3_CHUNK_SIZE >= MP3_BUFFER_SIZE){
155 DBG(printk("mp3_drv.ko : buffer is full? %ld\n", mp3_data_in_buffer);)
159 if(mp3_buffer_offset_write == MP3_BUFFER_SIZE){
160 mp3_buffer_offset_write = 0;
163 memcpy(&mp3_buffer[mp3_buffer_offset_write], mp3_data.mp3, MP3_CHUNK_SIZE);
164 mp3_buffer_offset_write += MP3_CHUNK_SIZE;
165 mp3_buffering_status = mp3_data.state;
166 mp3_data_in_buffer += MP3_CHUNK_SIZE;
170 static int module_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg){
171 unsigned int retval = 0;
172 AUDIO_DATA audio_data;
174 DBG(printk("mp3_drv.ko : Ioctl Called (cmd=%d)\n", cmd );)
178 VS1011_init(crystal_freq, 1);
179 VS1011_print_registers();
182 case IOCTL_MP3_RESET:
183 DBG(printk("mp3_drv.ko : doing a sw reset\n");)
184 VS1011_init(crystal_freq, 0);
185 VS1011_print_registers();
186 VS1011_send_zeros(0x20);
189 case IOCTL_MP3_SETVOLUME:
190 DBG(printk("mp3_drv.ko : setting volume to : %lu\n", arg&0xffff);)
191 VS1011_set_volume(arg);
194 case IOCTL_MP3_GETVOLUME:
195 retval = VS1011_get_volume();
196 DBG(printk("mp3_drv.ko : read volume : %d\n", retval);)
199 case IOCTL_MP3_GETAUDIODATA:
200 DBG(printk("mp3_drv.ko : read audio data\n");)
201 VS1011_get_audio_data(&audio_data);
202 copy_to_user((char*)arg, (char*)&audio_data, sizeof(AUDIO_DATA));
205 case IOCTL_MP3_CLEARBUFFER:
206 DBG(printk("mp3_drv.ko : clearing buffer\n");)
207 mp3_buffer_offset_read = 0;
208 mp3_buffer_offset_write = 0;
209 mp3_buffering_status = MP3_PLAY_FINISHED;
210 mp3_data_in_buffer = 0;
214 mp3_thread = kernel_thread(mp3_playback_thread, NULL, CLONE_KERNEL);
218 copy_from_user((char*)&mp3_beep, (char*)arg, sizeof(MP3_BEEP));
219 VS1011_sine(1,mp3_beep.freq);
220 msDelay(mp3_beep.ms);
224 case IOCTL_MP3_END_REACHED:
225 if(mp3_buffering_status == MP3_PLAY_FINISHED){
231 VS1011_set_bass(arg);
235 printk("mp3_drv.ko : unknown ioctl\n");
242 static int module_open(struct inode *inode, struct file *file){
243 unsigned int dev_minor = MINOR(inode->i_rdev);
245 printk("mp3_drv.ko : trying to access unknown minor device -> %d\n", dev_minor);
248 if(mp3_info[dev_minor].is_open) {
249 printk("mp3_drv.ko : Device with minor ID %d already in use\n", dev_minor);
252 mp3_info[dev_minor].is_open = 1;
254 mp3_buffering_status = MP3_PLAY_FINISHED;
255 printk("mp3_drv.ko : Minor %d has been opened\n", dev_minor);
259 static int module_close(struct inode * inode, struct file * file){
260 unsigned int dev_minor = MINOR(inode->i_rdev);
261 mp3_info[dev_minor].is_open = 0;
262 printk("mp3_drv.ko : Minor %d has been closed\n", dev_minor);
263 mp3_buffering_status = MP3_PLAY_FINISHED;
267 struct file_operations modulemp3_fops = {
271 release: module_close
274 static int __init mod_init(void){
275 printk("mp3_drv.ko : VS1011b Driver\n");
276 printk("mp3_drv.ko : Made by John '2B|!2B' Crispin (john@phrozen.org)\n");
277 printk("mp3_drv.ko : Starting ...\n");
279 if(register_chrdev(DEV_MAJOR, DEV_NAME, &modulemp3_fops)) {
280 printk( "mp3_drv.ko : Error whilst opening %s (%d)\n", DEV_NAME, DEV_MAJOR);
284 mp3_info[0].is_open = 0;
285 printk("mp3_drv.ko : Device %s registered for major ID %d\n", DEV_NAME, DEV_MAJOR);
286 crystal_freq = CRYSTAL12288;
287 VS1011_init(crystal_freq, 1);
288 VS1011_print_registers();
289 printk("end of init\n");
290 init_waitqueue_head(&wq);
291 printk("wait queue started\n");
295 static void __exit mod_exit(void){
296 printk( "mp3_drv.ko : Cleanup\n" );
297 unregister_chrdev(DEV_MAJOR, DEV_NAME);
300 module_init (mod_init);
301 module_exit (mod_exit);
303 MODULE_LICENSE("GPL");
304 MODULE_AUTHOR("K. John '2B|!2B' Crispin");
305 MODULE_DESCRIPTION("vs1011 Driver for Fox Board");