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 #include <linux/device.h>
  34
  35 // do we want debuging info ?
  36 #if 0
  37 #define DBG(x) x
  38 #else
  39 #define DBG(x)
  40 #endif
  41
  42 #define MP3_CHUNK_SIZE                  4096
  43 #define MP3_BUFFERING                   0
  44 #define MP3_PLAYING                     1
  45 #define MP3_BUFFER_FINISHED             2
  46 #define MP3_PLAY_FINISHED               3
  47 typedef struct _MP3_DATA{
  48         unsigned char   mp3[MP3_CHUNK_SIZE];
  49         unsigned char state;
  50 } MP3_DATA;
  51
  52 #define IOCTL_MP3_INIT                  0x01
  53 #define IOCTL_MP3_RESET                 0x02
  54 #define IOCTL_MP3_SETVOLUME             0x03
  55 #define IOCTL_MP3_GETVOLUME             0x04
  56
  57 typedef struct _AUDIO_DATA{
  58         unsigned int bitrate;
  59         unsigned int sample_rate;
  60         unsigned char is_stereo;
  61 }AUDIO_DATA;
  62 #define IOCTL_MP3_GETAUDIODATA          0x05
  63 #define IOCTL_MP3_CLEARBUFFER           0x06
  64 #define IOCTL_MP3_PLAY                  0x07
  65
  66 typedef struct _MP3_BEEP{
  67         unsigned char   freq;
  68         unsigned int    ms;
  69 } MP3_BEEP;
  70 #define IOCTL_MP3_BEEP                  0x08
  71 #define IOCTL_MP3_END_REACHED           0x09
  72 #define IOCTL_MP3_BASS                  0x10
  73
  74 #define CRYSTAL12288    0x9800
  75 #define CRYSTAL24576    0x0
  76
  77 #define DEV_NAME                        "mp3"
  78 #define DEV_MAJOR                       196
  79 #define MAX_MP3_COUNT   1
  80
  81 typedef struct _mp3_inf{
  82         unsigned char is_open;
  83 } mp3_inf;
  84 static mp3_inf mp3_info[MAX_MP3_COUNT];
  85
  86 #define MP3_BUFFER_SIZE         (128 * 1024)
  87 unsigned char mp3_buffer[MP3_BUFFER_SIZE];
  88
  89 static unsigned long int mp3_buffer_offset_write = 0;
  90 static unsigned long int mp3_buffer_offset_read = 0;
  91 static unsigned char mp3_buffering_status = MP3_BUFFERING;
  92 static unsigned long int mp3_data_in_buffer = 0;
  93 static int mp3_thread = 0;
  94 unsigned int crystal_freq;
  95
  96 #include "vs10xx.c"
  97
  98 static wait_queue_head_t wq;
  99 static DECLARE_COMPLETION(mp3_exit);
 100
 101 static int mp3_playback_thread(void *data){
 102         int j;
 103         unsigned long timeout;
 104         unsigned char empty = 0;
 105         printk("started kthread\n");
 106         daemonize("kmp3");
 107         while(mp3_buffering_status != MP3_PLAY_FINISHED){
 108                 if((mp3_buffering_status == MP3_PLAYING) || (mp3_buffering_status == MP3_BUFFER_FINISHED)){
 109                         while((VS1011_NEEDS_DATA) && (!empty)){
 110                                 if(mp3_buffer_offset_read == MP3_BUFFER_SIZE){
 111                                         mp3_buffer_offset_read = 0;
 112                                 }
 113
 114                                 if(mp3_data_in_buffer == 0){
 115                                         if(mp3_buffering_status == MP3_BUFFER_FINISHED){
 116                                                 printk("mp3_drv.ko : finished playing\n");
 117                                                 mp3_buffering_status = MP3_PLAY_FINISHED;
 118                                         } else {
 119                                                 empty = 1;
 120                                                 printk("mp3_drv.ko : buffer empty ?\n");
 121                                                 if(mp3_buffering_status != MP3_PLAY_FINISHED){
 122                                                 }
 123                                         }
 124                                 } else {
 125                                         for(j = 0; j < 32; j++){
 126                                                 VS1011_send_SDI(mp3_buffer[mp3_buffer_offset_read + j]);
 127                                         }
 128                                         mp3_buffer_offset_read += 32;
 129                                         mp3_data_in_buffer -= 32;
 130                                 }
 131                         }
 132                 }
 133                 empty = 0;
 134                 timeout = 1;
 135         timeout = wait_event_interruptible_timeout(wq, (timeout==0), timeout);
 136         }
 137         complete_and_exit(&mp3_exit, 0);
 138 }
 139
 140 static ssize_t module_write(struct file * file, const char * buffer, size_t count, loff_t *offset){
 141         MP3_DATA mp3_data;
 142
 143         copy_from_user((char*) &mp3_data, buffer, sizeof(MP3_DATA));
 144
 145         if(mp3_data.state == MP3_BUFFER_FINISHED){
 146                 mp3_buffering_status = MP3_BUFFER_FINISHED;
 147                 DBG(printk("mp3_drv.ko : file end reached\n"));
 148                 return 1;
 149         }
 150
 151         if(mp3_data.state == MP3_PLAY_FINISHED){
 152                 mp3_buffering_status = MP3_PLAY_FINISHED;
 153                 mp3_data_in_buffer = 0;
 154                 DBG(printk("mp3_drv.ko : stop playing\n"));
 155                 return 1;
 156         }
 157
 158         if(mp3_data_in_buffer + MP3_CHUNK_SIZE >= MP3_BUFFER_SIZE){
 159                 DBG(printk("mp3_drv.ko : buffer is full? %ld\n", mp3_data_in_buffer);)
 160                 return 0;
 161         }
 162
 163         if(mp3_buffer_offset_write == MP3_BUFFER_SIZE){
 164                 mp3_buffer_offset_write = 0;
 165         }
 166
 167         memcpy(&mp3_buffer[mp3_buffer_offset_write], mp3_data.mp3, MP3_CHUNK_SIZE);
 168         mp3_buffer_offset_write += MP3_CHUNK_SIZE;
 169         mp3_buffering_status = mp3_data.state;
 170         mp3_data_in_buffer += MP3_CHUNK_SIZE;
 171         return 1;
 172 }
 173
 174 static int module_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg){
 175         unsigned int    retval = 0;
 176         AUDIO_DATA      audio_data;
 177         MP3_BEEP        mp3_beep;
 178         DBG(printk("mp3_drv.ko : Ioctl Called (cmd=%d)\n", cmd );)
 179         switch (cmd) {
 180                 case IOCTL_MP3_INIT:
 181                         crystal_freq = arg;
 182                         VS1011_init(crystal_freq, 1);
 183                         VS1011_print_registers();
 184                         break;
 185
 186                 case IOCTL_MP3_RESET:
 187                         DBG(printk("mp3_drv.ko : doing a sw reset\n");)
 188                         VS1011_init(crystal_freq, 0);
 189                         VS1011_print_registers();
 190                         VS1011_send_zeros(0x20);
 191                         break;
 192
 193                 case IOCTL_MP3_SETVOLUME:
 194                         DBG(printk("mp3_drv.ko : setting volume to : %lu\n", arg&0xffff);)
 195                         VS1011_set_volume(arg);
 196                         break;
 197
 198                 case IOCTL_MP3_GETVOLUME:
 199                         retval = VS1011_get_volume();
 200                         DBG(printk("mp3_drv.ko : read volume : %d\n", retval);)
 201                         break;
 202
 203                 case IOCTL_MP3_GETAUDIODATA:
 204                         DBG(printk("mp3_drv.ko : read audio data\n");)
 205                         VS1011_get_audio_data(&audio_data);
 206                         copy_to_user((char*)arg, (char*)&audio_data, sizeof(AUDIO_DATA));
 207                         break;
 208
 209                 case IOCTL_MP3_CLEARBUFFER:
 210                         DBG(printk("mp3_drv.ko : clearing buffer\n");)
 211                         mp3_buffer_offset_read = 0;
 212                         mp3_buffer_offset_write = 0;
 213                         mp3_buffering_status = MP3_PLAY_FINISHED;
 214                         mp3_data_in_buffer = 0;
 215                         break;
 216
 217                 case IOCTL_MP3_PLAY:
 218                         mp3_thread = kernel_thread(mp3_playback_thread, NULL, CLONE_KERNEL);
 219                         break;
 220
 221                 case IOCTL_MP3_BEEP:
 222                         copy_from_user((char*)&mp3_beep, (char*)arg, sizeof(MP3_BEEP));
 223                         VS1011_sine(1,mp3_beep.freq);
 224                         msDelay(mp3_beep.ms);
 225                         VS1011_sine(0,0);
 226                         break;
 227
 228                 case IOCTL_MP3_END_REACHED:
 229                         if(mp3_buffering_status == MP3_PLAY_FINISHED){
 230                                 retval = 1;
 231                         }
 232                         break;
 233
 234                 case IOCTL_MP3_BASS:
 235                         VS1011_set_bass(arg);
 236                         break;
 237
 238                 default:
 239                         printk("mp3_drv.ko : unknown ioctl\n");
 240                         break;
 241
 242         }
 243         return retval;
 244 }
 245
 246 static int module_open(struct inode *inode, struct file *file){
 247         unsigned int dev_minor = MINOR(inode->i_rdev);
 248         if(dev_minor !=  0){
 249                 printk("mp3_drv.ko : trying to access unknown minor device -> %d\n", dev_minor);
 250                 return -ENODEV;
 251         }
 252         if(mp3_info[dev_minor].is_open) {
 253                 printk("mp3_drv.ko : Device with minor ID %d already in use\n", dev_minor);
 254                 return -EBUSY;
 255         }
 256         mp3_info[dev_minor].is_open = 1;
 257
 258         mp3_buffering_status = MP3_PLAY_FINISHED;
 259         printk("mp3_drv.ko : Minor %d has been opened\n", dev_minor);
 260         return 0;
 261 }
 262
 263 static int module_close(struct inode * inode, struct file * file){
 264         unsigned int dev_minor = MINOR(inode->i_rdev);
 265         mp3_info[dev_minor].is_open = 0;
 266         printk("mp3_drv.ko : Minor %d has been closed\n", dev_minor);
 267         mp3_buffering_status = MP3_PLAY_FINISHED;
 268         return 0;
 269 }
 270
 271 struct file_operations modulemp3_fops = {
 272         write:         module_write,
 273         ioctl:         module_ioctl,
 274         open:          module_open,
 275         release:       module_close
 276 };
 277
 278 static struct class *mp3_class;
 279
 280 static int __init mod_init(void){
 281         printk("mp3_drv.ko : VS1011b Driver\n");
 282         printk("mp3_drv.ko : Made by John '2B|!2B' Crispin (john@phrozen.org)\n");
 283         printk("mp3_drv.ko : Starting ...\n");
 284
 285         if(register_chrdev(DEV_MAJOR, DEV_NAME, &modulemp3_fops)) {
 286                 printk( "mp3_drv.ko : Error whilst opening %s (%d)\n", DEV_NAME, DEV_MAJOR);
 287                 return( -ENODEV );
 288         }
 289
 290         printk("mp3_drv.ko : using sysfs to create device nodes\n");
 291         mp3_class = class_create(THIS_MODULE, DEV_NAME);
 292         class_device_create(mp3_class, NULL,
 293                 MKDEV(DEV_MAJOR, 0),
 294                 NULL, DEV_NAME);
 295
 296         mp3_info[0].is_open = 0;
 297         printk("mp3_drv.ko : Device %s registered for major ID %d\n", DEV_NAME, DEV_MAJOR);
 298         crystal_freq = CRYSTAL12288;
 299         VS1011_init(crystal_freq, 1);
 300         VS1011_print_registers();
 301         printk("end of init\n");
 302         init_waitqueue_head(&wq);
 303         printk("wait queue started\n");
 304         return 0;
 305 }
 306
 307 static void __exit mod_exit(void){
 308         printk( "mp3_drv.ko : Cleanup\n" );
 309         unregister_chrdev(DEV_MAJOR, DEV_NAME);
 310 }
 311
 312 module_init (mod_init);
 313 module_exit (mod_exit);
 314
 315 MODULE_LICENSE("GPL");
 316 MODULE_AUTHOR("K. John '2B|!2B' Crispin");
 317 MODULE_DESCRIPTION("vs1011 Driver for Fox Board");
 318
 319
 320