package/fonera-mp3-drv/src/mp3_drv.c

   1 /*
   2 * a.lp_mp3 - VS1011B driver for Fonera
   3 * Copyright (c) 2007 phrozen.org - John Crispin <john@phrozen.org>
   4 *
   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.
   9 *
  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.
  14 *
  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
  18 *
  19 * Feedback, Bugs...  john@phrozen.org
  20 *
  21 */
  22
  23
  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>
  29 #include <asm/io.h>
  30 #include <linux/timer.h>
  31 #include <linux/init.h>
  32 #include <linux/genhd.h>
  33
  34 // do we want debuging info ?
  35 #if 0
  36 #define DBG(x) x
  37 #else
  38 #define DBG(x)
  39 #endif
  40
  41 #define MP3_CHUNK_SIZE                  4096
  42 #define MP3_BUFFERING                   0
  43 #define MP3_PLAYING                     1
  44 #define MP3_BUFFER_FINISHED             2
  45 #define MP3_PLAY_FINISHED               3
  46 typedef struct _MP3_DATA{
  47         unsigned char   mp3[MP3_CHUNK_SIZE];
  48         unsigned char state;
  49 } MP3_DATA;
  50
  51 #define IOCTL_MP3_INIT                  0x01
  52 #define IOCTL_MP3_RESET                 0x02
  53 #define IOCTL_MP3_SETVOLUME             0x03
  54 #define IOCTL_MP3_GETVOLUME             0x04
  55
  56 typedef struct _AUDIO_DATA{
  57         unsigned int bitrate;
  58         unsigned int sample_rate;
  59         unsigned char is_stereo;
  60 }AUDIO_DATA;
  61 #define IOCTL_MP3_GETAUDIODATA          0x05
  62 #define IOCTL_MP3_CLEARBUFFER           0x06
  63 #define IOCTL_MP3_PLAY                  0x07
  64
  65 typedef struct _MP3_BEEP{
  66         unsigned char   freq;
  67         unsigned int    ms;
  68 } MP3_BEEP;
  69 #define IOCTL_MP3_BEEP                  0x08
  70 #define IOCTL_MP3_END_REACHED           0x09
  71 #define IOCTL_MP3_BASS                  0x10
  72
  73 #define CRYSTAL12288    0x9800
  74 #define CRYSTAL24576    0x0
  75
  76 #define DEV_NAME                        "mp3"
  77 #define DEV_MAJOR                       196
  78 #define MAX_MP3_COUNT   1
  79
  80 typedef struct _mp3_inf{
  81         unsigned char is_open;
  82 } mp3_inf;
  83 static mp3_inf mp3_info[MAX_MP3_COUNT];
  84
  85 #define MP3_BUFFER_SIZE         (128 * 1024)
  86 unsigned char mp3_buffer[MP3_BUFFER_SIZE];
  87
  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;
  94
  95 #include "vs10xx.c"
  96
  97 static wait_queue_head_t wq;
  98 static DECLARE_COMPLETION(mp3_exit);
  99
 100 static int mp3_playback_thread(void *data){
 101         int j;
 102         unsigned long timeout;
 103         printk("started kthread\n");
 104         daemonize("kmp3");
 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;
 110                                 }
 111
 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;
 116                                         } else {
 117                                                 printk("mp3_drv.ko : buffer empty ?\n");
 118                                                 if(mp3_buffering_status != MP3_PLAY_FINISHED){
 119                                                 }
 120                                         }
 121                                 } else {
 122                                         for(j = 0; j < 32; j++){
 123                                                 VS1011_send_SDI(mp3_buffer[mp3_buffer_offset_read + j]);
 124                                         }
 125                                         mp3_buffer_offset_read += 32;
 126                                         mp3_data_in_buffer -= 32;
 127                                 }
 128                         }
 129                 }
 130                 timeout = 1;
 131                 timeout = wait_event_interruptible_timeout(wq, (timeout==0), timeout);
 132         }
 133         complete_and_exit(&mp3_exit, 0);
 134 }
 135
 136 static ssize_t module_write(struct file * file, const char * buffer, size_t count, loff_t *offset){
 137         MP3_DATA mp3_data;
 138
 139         copy_from_user((char*) &mp3_data, buffer, sizeof(MP3_DATA));
 140
 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"));
 144                 return 1;
 145         }
 146
 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"));
 151                 return 1;
 152         }
 153
 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);)
 156                 return 0;
 157         }
 158
 159         if(mp3_buffer_offset_write == MP3_BUFFER_SIZE){
 160                 mp3_buffer_offset_write = 0;
 161         }
 162
 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;
 167         return 1;
 168 }
 169
 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;
 173         MP3_BEEP        mp3_beep;
 174         DBG(printk("mp3_drv.ko : Ioctl Called (cmd=%d)\n", cmd );)
 175         switch (cmd) {
 176                 case IOCTL_MP3_INIT:
 177                         crystal_freq = arg;
 178                         VS1011_init(crystal_freq, 1);
 179                         VS1011_print_registers();
 180                         break;
 181
 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);
 187                         break;
 188
 189                 case IOCTL_MP3_SETVOLUME:
 190                         DBG(printk("mp3_drv.ko : setting volume to : %lu\n", arg&0xffff);)
 191                         VS1011_set_volume(arg);
 192                         break;
 193
 194                 case IOCTL_MP3_GETVOLUME:
 195                         retval = VS1011_get_volume();
 196                         DBG(printk("mp3_drv.ko : read volume : %d\n", retval);)
 197                         break;
 198
 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));
 203                         break;
 204
 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;
 211                         break;
 212
 213                 case IOCTL_MP3_PLAY:
 214                         mp3_thread = kernel_thread(mp3_playback_thread, NULL, CLONE_KERNEL);
 215                         break;
 216
 217                 case IOCTL_MP3_BEEP:
 218                         copy_from_user((char*)&mp3_beep, (char*)arg, sizeof(MP3_BEEP));
 219                         VS1011_sine(1,mp3_beep.freq);
 220                         msDelay(mp3_beep.ms);
 221                         VS1011_sine(0,0);
 222                         break;
 223
 224                 case IOCTL_MP3_END_REACHED:
 225                         if(mp3_buffering_status == MP3_PLAY_FINISHED){
 226                                 retval = 1;
 227                         }
 228                         break;
 229
 230                 case IOCTL_MP3_BASS:
 231                         VS1011_set_bass(arg);
 232                         break;
 233
 234                 default:
 235                         printk("mp3_drv.ko : unknown ioctl\n");
 236                         break;
 237
 238         }
 239         return retval;
 240 }
 241
 242 static int module_open(struct inode *inode, struct file *file){
 243         unsigned int dev_minor = MINOR(inode->i_rdev);
 244         if(dev_minor !=  0){
 245                 printk("mp3_drv.ko : trying to access unknown minor device -> %d\n", dev_minor);
 246                 return -ENODEV;
 247         }
 248         if(mp3_info[dev_minor].is_open) {
 249                 printk("mp3_drv.ko : Device with minor ID %d already in use\n", dev_minor);
 250                 return -EBUSY;
 251         }
 252         mp3_info[dev_minor].is_open = 1;
 253
 254         mp3_buffering_status = MP3_PLAY_FINISHED;
 255         printk("mp3_drv.ko : Minor %d has been opened\n", dev_minor);
 256         return 0;
 257 }
 258
 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;
 264         return 0;
 265 }
 266
 267 struct file_operations modulemp3_fops = {
 268         write:         module_write,
 269         ioctl:         module_ioctl,
 270         open:          module_open,
 271         release:       module_close
 272 };
 273
 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");
 278
 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);
 281                 return( -ENODEV );
 282         }
 283
 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");
 292         return 0;
 293 }
 294
 295 static void __exit mod_exit(void){
 296         printk( "mp3_drv.ko : Cleanup\n" );
 297         unregister_chrdev(DEV_MAJOR, DEV_NAME);
 298 }
 299
 300 module_init (mod_init);
 301 module_exit (mod_exit);
 302
 303 MODULE_LICENSE("GPL");
 304 MODULE_AUTHOR("K. John '2B|!2B' Crispin");
 305 MODULE_DESCRIPTION("vs1011 Driver for Fox Board");
 306
 307
 308