1 /* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff 2 * 3 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood 4 * Converted to new API by Alan Cox <Alan.Cox@linux.org> 5 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> 6 * 7 * TODO: Allow for more than one of these foolish entities :-) 8 * 9 */ 10 11 #include <linux/module.h> /* Modules */ 12 #include <linux/init.h> /* Initdata */ 13 #include <linux/ioport.h> /* check_region, request_region */ 14 #include <linux/delay.h> /* udelay */ 15 #include <asm/io.h> /* outb, outb_p */ 16 #include <asm/uaccess.h> /* copy to/from user */ 17 #include <linux/videodev.h> /* kernel radio structs */ 18 #include <linux/config.h> /* CONFIG_RADIO_RTRACK2_PORT */ 19 #include <linux/spinlock.h> 20 21 #ifndef CONFIG_RADIO_RTRACK2_PORT 22 #define CONFIG_RADIO_RTRACK2_PORT -1 23 #endif 24 25 static int io = CONFIG_RADIO_RTRACK2_PORT; 26 static int radio_nr = -1; 27 static spinlock_t lock; 28 29 struct rt_device 30 { 31 int port; 32 unsigned long curfreq; 33 int muted; 34 }; 35 36 37 /* local things */ 38 39 static void rt_mute(struct rt_device *dev) 40 { 41 if(dev->muted) 42 return; 43 spin_lock(&lock); 44 outb(1, io); 45 spin_unlock(&lock); 46 dev->muted = 1; 47 } 48 49 static void rt_unmute(struct rt_device *dev) 50 { 51 if(dev->muted == 0) 52 return; 53 spin_lock(&lock); 54 outb(0, io); 55 spin_unlock(&lock); 56 dev->muted = 0; 57 } 58 59 static void zero(void) 60 { 61 outb_p(1, io); 62 outb_p(3, io); 63 outb_p(1, io); 64 } 65 66 static void one(void) 67 { 68 outb_p(5, io); 69 outb_p(7, io); 70 outb_p(5, io); 71 } 72 73 static int rt_setfreq(struct rt_device *dev, unsigned long freq) 74 { 75 int i; 76 77 freq = freq / 200 + 856; 78 79 spin_lock(&lock); 80 81 outb_p(0xc8, io); 82 outb_p(0xc9, io); 83 outb_p(0xc9, io); 84 85 for (i = 0; i < 10; i++) 86 zero (); 87 88 for (i = 14; i >= 0; i--) 89 if (freq & (1 << i)) 90 one (); 91 else 92 zero (); 93 94 outb_p(0xc8, io); 95 if (!dev->muted) 96 outb_p(0, io); 97 98 spin_unlock(&lock); 99 return 0; 100 } 101 102 static int rt_getsigstr(struct rt_device *dev) 103 { 104 if (inb(io) & 2) /* bit set = no signal present */ 105 return 0; 106 return 1; /* signal present */ 107 } 108 109 static int rt_do_ioctl(struct inode *inode, struct file *file, 110 unsigned int cmd, void *arg) 111 { 112 struct video_device *dev = video_devdata(file); 113 struct rt_device *rt=dev->priv; 114 115 switch(cmd) 116 { 117 case VIDIOCGCAP: 118 { 119 struct video_capability *v = arg; 120 memset(v,0,sizeof(*v)); 121 v->type=VID_TYPE_TUNER; 122 v->channels=1; 123 v->audios=1; 124 strcpy(v->name, "RadioTrack II"); 125 return 0; 126 } 127 case VIDIOCGTUNER: 128 { 129 struct video_tuner *v = arg; 130 if(v->tuner) /* Only 1 tuner */ 131 return -EINVAL; 132 v->rangelow=88*16000; 133 v->rangehigh=108*16000; 134 v->flags=VIDEO_TUNER_LOW; 135 v->mode=VIDEO_MODE_AUTO; 136 v->signal=0xFFFF*rt_getsigstr(rt); 137 strcpy(v->name, "FM"); 138 return 0; 139 } 140 case VIDIOCSTUNER: 141 { 142 struct video_tuner *v = arg; 143 if(v->tuner!=0) 144 return -EINVAL; 145 /* Only 1 tuner so no setting needed ! */ 146 return 0; 147 } 148 case VIDIOCGFREQ: 149 { 150 unsigned long *freq = arg; 151 *freq = rt->curfreq; 152 return 0; 153 } 154 case VIDIOCSFREQ: 155 { 156 unsigned long *freq = arg; 157 rt->curfreq = *freq; 158 rt_setfreq(rt, rt->curfreq); 159 return 0; 160 } 161 case VIDIOCGAUDIO: 162 { 163 struct video_audio *v = arg; 164 memset(v,0, sizeof(*v)); 165 v->flags|=VIDEO_AUDIO_MUTABLE; 166 v->volume=1; 167 v->step=65535; 168 strcpy(v->name, "Radio"); 169 return 0; 170 } 171 case VIDIOCSAUDIO: 172 { 173 struct video_audio *v = arg; 174 if(v->audio) 175 return -EINVAL; 176 177 if(v->flags&VIDEO_AUDIO_MUTE) 178 rt_mute(rt); 179 else 180 rt_unmute(rt); 181 182 return 0; 183 } 184 default: 185 return -ENOIOCTLCMD; 186 } 187 } 188 189 static int rt_ioctl(struct inode *inode, struct file *file, 190 unsigned int cmd, unsigned long arg) 191 { 192 return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); 193 } 194 195 static struct rt_device rtrack2_unit; 196 197 static struct file_operations rtrack2_fops = { 198 .owner = THIS_MODULE, 199 .open = video_exclusive_open, 200 .release = video_exclusive_release, 201 .ioctl = rt_ioctl, 202 .llseek = no_llseek, 203 }; 204 205 static struct video_device rtrack2_radio= 206 { 207 .owner = THIS_MODULE, 208 .name = "RadioTrack II radio", 209 .type = VID_TYPE_TUNER, 210 .hardware = VID_HARDWARE_RTRACK2, 211 .fops = &rtrack2_fops, 212 }; 213 214 static int __init rtrack2_init(void) 215 { 216 if(io==-1) 217 { 218 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n"); 219 return -EINVAL; 220 } 221 if (!request_region(io, 4, "rtrack2")) 222 { 223 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io); 224 return -EBUSY; 225 } 226 227 rtrack2_radio.priv=&rtrack2_unit; 228 229 spin_lock_init(&lock); 230 if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1) 231 { 232 release_region(io, 4); 233 return -EINVAL; 234 } 235 236 printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n"); 237 238 /* mute card - prevents noisy bootups */ 239 outb(1, io); 240 rtrack2_unit.muted = 1; 241 242 return 0; 243 } 244 245 MODULE_AUTHOR("Ben Pfaff"); 246 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card."); 247 MODULE_LICENSE("GPL"); 248 249 module_param(io, int, 0); 250 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)"); 251 module_param(radio_nr, int, 0); 252 253 static void __exit rtrack2_cleanup_module(void) 254 { 255 video_unregister_device(&rtrack2_radio); 256 release_region(io,4); 257 } 258 259 module_init(rtrack2_init); 260 module_exit(rtrack2_cleanup_module); 261 262 /* 263 Local variables: 264 compile-command: "mmake" 265 End: 266 */ 267