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         printk("started kthread\n");
 105         daemonize("kmp3");
 106         while(mp3_buffering_status != MP3_PLAY_FINISHED){
 107                 if((mp3_buffering_status == MP3_PLAYING) || (mp3_buffering_status == MP3_BUFFER_FINISHED)){
 108                         while(VS1011_NEEDS_DATA){
 109                                 if(mp3_buffer_offset_read == MP3_BUFFER_SIZE){
 110                                         mp3_buffer_offset_read = 0;
 111                                 }
 112
 113                                 if(mp3_data_in_buffer == 0){
 114                                         if(mp3_buffering_status == MP3_BUFFER_FINISHED){
 115                                                 printk("mp3_drv.ko : finished playing\n");
 116                                                 mp3_buffering_status = MP3_PLAY_FINISHED;
 117                                         } else {
 118                                                 printk("mp3_drv.ko : buffer empty ?\n");
 119                                                 if(mp3_buffering_status != MP3_PLAY_FINISHED){
 120                                                 }
 121                                         }
 122                                 } else {
 123                                         for(j = 0; j < 32; j++){
 124                                                 VS1011_send_SDI(mp3_buffer[mp3_buffer_offset_read + j]);
 125                                         }
 126                                         mp3_buffer_offset_read += 32;
 127                                         mp3_data_in_buffer -= 32;
 128                                 }
 129                         }
 130                 }
 131                 timeout = 1;
 132                 timeout = wait_event_interruptible_timeout(wq, (timeout==0), timeout);
 133         }
 134         complete_and_exit(&mp3_exit, 0);
 135 }
 136
 137 static ssize_t module_write(struct file * file, const char * buffer, size_t count, loff_t *offset){
 138         MP3_DATA mp3_data;
 139
 140         copy_from_user((char*) &mp3_data, buffer, sizeof(MP3_DATA));
 141
 142         if(mp3_data.state == MP3_BUFFER_FINISHED){
 143                 mp3_buffering_status = MP3_BUFFER_FINISHED;
 144                 DBG(printk("mp3_drv.ko : file end reached\n"));
 145                 return 1;
 146         }
 147
 148         if(mp3_data.state == MP3_PLAY_FINISHED){
 149                 mp3_buffering_status = MP3_PLAY_FINISHED;
 150                 mp3_data_in_buffer = 0;
 151                 DBG(printk("mp3_drv.ko : stop playing\n"));
 152                 return 1;
 153         }
 154
 155         if(mp3_data_in_buffer + MP3_CHUNK_SIZE >= MP3_BUFFER_SIZE){
 156                 DBG(printk("mp3_drv.ko : buffer is full? %ld\n", mp3_data_in_buffer);)
 157                 return 0;
 158         }
 159
 160         if(mp3_buffer_offset_write == MP3_BUFFER_SIZE){
 161                 mp3_buffer_offset_write = 0;
 162         }
 163
 164         memcpy(&mp3_buffer[mp3_buffer_offset_write], mp3_data.mp3, MP3_CHUNK_SIZE);
 165         mp3_buffer_offset_write += MP3_CHUNK_SIZE;
 166         mp3_buffering_status = mp3_data.state;
 167         mp3_data_in_buffer += MP3_CHUNK_SIZE;
 168         return 1;
 169 }
 170
 171 static int module_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg){
 172         unsigned int    retval = 0;
 173         AUDIO_DATA      audio_data;
 174         MP3_BEEP        mp3_beep;
 175         DBG(printk("mp3_drv.ko : Ioctl Called (cmd=%d)\n", cmd );)
 176         switch (cmd) {
 177                 case IOCTL_MP3_INIT:
 178                         crystal_freq = arg;
 179                         VS1011_init(crystal_freq, 1);
 180                         VS1011_print_registers();
 181                         break;
 182
 183                 case IOCTL_MP3_RESET:
 184                         DBG(printk("mp3_drv.ko : doing a sw reset\n");)
 185                         VS1011_init(crystal_freq, 0);
 186                         VS1011_print_registers();
 187                         VS1011_send_zeros(0x20);
 188                         break;
 189
 190                 case IOCTL_MP3_SETVOLUME:
 191                         DBG(printk("mp3_drv.ko : setting volume to : %lu\n", arg&0xffff);)
 192                         VS1011_set_volume(arg);
 193                         break;
 194
 195                 case IOCTL_MP3_GETVOLUME:
 196                         retval = VS1011_get_volume();
 197                         DBG(printk("mp3_drv.ko : read volume : %d\n", retval);)
 198                         break;
 199
 200                 case IOCTL_MP3_GETAUDIODATA:
 201                         DBG(printk("mp3_drv.ko : read audio data\n");)
 202                         VS1011_get_audio_data(&audio_data);
 203                         copy_to_user((char*)arg, (char*)&audio_data, sizeof(AUDIO_DATA));
 204                         break;
 205
 206                 case IOCTL_MP3_CLEARBUFFER:
 207                         DBG(printk("mp3_drv.ko : clearing buffer\n");)
 208                         mp3_buffer_offset_read = 0;
 209                         mp3_buffer_offset_write = 0;
 210                         mp3_buffering_status = MP3_PLAY_FINISHED;
 211                         mp3_data_in_buffer = 0;
 212                         break;
 213
 214                 case IOCTL_MP3_PLAY:
 215                         mp3_thread = kernel_thread(mp3_playback_thread, NULL, CLONE_KERNEL);
 216                         break;
 217
 218                 case IOCTL_MP3_BEEP:
 219                         copy_from_user((char*)&mp3_beep, (char*)arg, sizeof(MP3_BEEP));
 220                         VS1011_sine(1,mp3_beep.freq);
 221                         msDelay(mp3_beep.ms);
 222                         VS1011_sine(0,0);
 223                         break;
 224
 225                 case IOCTL_MP3_END_REACHED:
 226                         if(mp3_buffering_status == MP3_PLAY_FINISHED){
 227                                 retval = 1;
 228                         }
 229                         break;
 230
 231                 case IOCTL_MP3_BASS:
 232                         VS1011_set_bass(arg);
 233                         break;
 234
 235                 default:
 236                         printk("mp3_drv.ko : unknown ioctl\n");
 237                         break;
 238
 239         }
 240         return retval;
 241 }
 242
 243 static int module_open(struct inode *inode, struct file *file){
 244         unsigned int dev_minor = MINOR(inode->i_rdev);
 245         if(dev_minor !=  0){
 246                 printk("mp3_drv.ko : trying to access unknown minor device -> %d\n", dev_minor);
 247                 return -ENODEV;
 248         }
 249         if(mp3_info[dev_minor].is_open) {
 250                 printk("mp3_drv.ko : Device with minor ID %d already in use\n", dev_minor);
 251                 return -EBUSY;
 252         }
 253         mp3_info[dev_minor].is_open = 1;
 254
 255         mp3_buffering_status = MP3_PLAY_FINISHED;
 256         printk("mp3_drv.ko : Minor %d has been opened\n", dev_minor);
 257         return 0;
 258 }
 259
 260 static int module_close(struct inode * inode, struct file * file){
 261         unsigned int dev_minor = MINOR(inode->i_rdev);
 262         mp3_info[dev_minor].is_open = 0;
 263         printk("mp3_drv.ko : Minor %d has been closed\n", dev_minor);
 264         mp3_buffering_status = MP3_PLAY_FINISHED;
 265         return 0;
 266 }
 267
 268 struct file_operations modulemp3_fops = {
 269         write:         module_write,
 270         ioctl:         module_ioctl,
 271         open:          module_open,
 272         release:       module_close
 273 };
 274
 275 static struct class *mp3_class;
 276
 277 static int __init mod_init(void){
 278         printk("mp3_drv.ko : VS1011b Driver\n");
 279         printk("mp3_drv.ko : Made by John '2B|!2B' Crispin (john@phrozen.org)\n");
 280         printk("mp3_drv.ko : Starting ...\n");
 281
 282         if(register_chrdev(DEV_MAJOR, DEV_NAME, &modulemp3_fops)) {
 283                 printk( "mp3_drv.ko : Error whilst opening %s (%d)\n", DEV_NAME, DEV_MAJOR);
 284                 return( -ENODEV );
 285         }
 286
 287         printk("mp3_drv.ko : using sysfs to create device nodes\n");
 288         mp3_class = class_create(THIS_MODULE, DEV_NAME);
 289         class_device_create(mp3_class, NULL,
 290                 MKDEV(DEV_MAJOR, 0),
 291                 NULL, DEV_NAME);
 292
 293         mp3_info[0].is_open = 0;
 294         printk("mp3_drv.ko : Device %s registered for major ID %d\n", DEV_NAME, DEV_MAJOR);
 295         crystal_freq = CRYSTAL12288;
 296         VS1011_init(crystal_freq, 1);
 297         VS1011_print_registers();
 298         printk("end of init\n");
 299         init_waitqueue_head(&wq);
 300         printk("wait queue started\n");
 301         return 0;
 302 }
 303
 304 static void __exit mod_exit(void){
 305         printk( "mp3_drv.ko : Cleanup\n" );
 306         unregister_chrdev(DEV_MAJOR, DEV_NAME);
 307 }
 308
 309 module_init (mod_init);
 310 module_exit (mod_exit);
 311
 312 MODULE_LICENSE("GPL");
 313 MODULE_AUTHOR("K. John '2B|!2B' Crispin");
 314 MODULE_DESCRIPTION("vs1011 Driver for Fox Board");
 315
 316
 317