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> /* 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 <media/v4l2-common.h> 19 #include <linux/config.h> /* CONFIG_RADIO_RTRACK2_PORT */ 20 #include <linux/spinlock.h> 21 22 #ifndef CONFIG_RADIO_RTRACK2_PORT 23 #define CONFIG_RADIO_RTRACK2_PORT -1 24 #endif 25 26 static int io = CONFIG_RADIO_RTRACK2_PORT; 27 static int radio_nr = -1; 28 static spinlock_t lock; 29 30 struct rt_device 31 { 32 int port; 33 unsigned long curfreq; 34 int muted; 35 }; 36 37 38 /* local things */ 39 40 static void rt_mute(struct rt_device *dev) 41 { 42 if(dev->muted) 43 return; 44 spin_lock(&lock); 45 outb(1, io); 46 spin_unlock(&lock); 47 dev->muted = 1; 48 } 49 50 static void rt_unmute(struct rt_device *dev) 51 { 52 if(dev->muted == 0) 53 return; 54 spin_lock(&lock); 55 outb(0, io); 56 spin_unlock(&lock); 57 dev->muted = 0; 58 } 59 60 static void zero(void) 61 { 62 outb_p(1, io); 63 outb_p(3, io); 64 outb_p(1, io); 65 } 66 67 static void one(void) 68 { 69 outb_p(5, io); 70 outb_p(7, io); 71 outb_p(5, io); 72 } 73 74 static int rt_setfreq(struct rt_device *dev, unsigned long freq) 75 { 76 int i; 77 78 freq = freq / 200 + 856; 79 80 spin_lock(&lock); 81 82 outb_p(0xc8, io); 83 outb_p(0xc9, io); 84 outb_p(0xc9, io); 85 86 for (i = 0; i < 10; i++) 87 zero (); 88 89 for (i = 14; i >= 0; i--) 90 if (freq & (1 << i)) 91 one (); 92 else 93 zero (); 94 95 outb_p(0xc8, io); 96 if (!dev->muted) 97 outb_p(0, io); 98 99 spin_unlock(&lock); 100 return 0; 101 } 102 103 static int rt_getsigstr(struct rt_device *dev) 104 { 105 if (inb(io) & 2) /* bit set = no signal present */ 106 return 0; 107 return 1; /* signal present */ 108 } 109 110 static int rt_do_ioctl(struct inode *inode, struct file *file, 111 unsigned int cmd, void *arg) 112 { 113 struct video_device *dev = video_devdata(file); 114 struct rt_device *rt=dev->priv; 115 116 switch(cmd) 117 { 118 case VIDIOCGCAP: 119 { 120 struct video_capability *v = arg; 121 memset(v,0,sizeof(*v)); 122 v->type=VID_TYPE_TUNER; 123 v->channels=1; 124 v->audios=1; 125 strcpy(v->name, "RadioTrack II"); 126 return 0; 127 } 128 case VIDIOCGTUNER: 129 { 130 struct video_tuner *v = arg; 131 if(v->tuner) /* Only 1 tuner */ 132 return -EINVAL; 133 v->rangelow=88*16000; 134 v->rangehigh=108*16000; 135 v->flags=VIDEO_TUNER_LOW; 136 v->mode=VIDEO_MODE_AUTO; 137 v->signal=0xFFFF*rt_getsigstr(rt); 138 strcpy(v->name, "FM"); 139 return 0; 140 } 141 case VIDIOCSTUNER: 142 { 143 struct video_tuner *v = arg; 144 if(v->tuner!=0) 145 return -EINVAL; 146 /* Only 1 tuner so no setting needed ! */ 147 return 0; 148 } 149 case VIDIOCGFREQ: 150 { 151 unsigned long *freq = arg; 152 *freq = rt->curfreq; 153 return 0; 154 } 155 case VIDIOCSFREQ: 156 { 157 unsigned long *freq = arg; 158 rt->curfreq = *freq; 159 rt_setfreq(rt, rt->curfreq); 160 return 0; 161 } 162 case VIDIOCGAUDIO: 163 { 164 struct video_audio *v = arg; 165 memset(v,0, sizeof(*v)); 166 v->flags|=VIDEO_AUDIO_MUTABLE; 167 v->volume=1; 168 v->step=65535; 169 strcpy(v->name, "Radio"); 170 return 0; 171 } 172 case VIDIOCSAUDIO: 173 { 174 struct video_audio *v = arg; 175 if(v->audio) 176 return -EINVAL; 177 178 if(v->flags&VIDEO_AUDIO_MUTE) 179 rt_mute(rt); 180 else 181 rt_unmute(rt); 182 183 return 0; 184 } 185 default: 186 return -ENOIOCTLCMD; 187 } 188 } 189 190 static int rt_ioctl(struct inode *inode, struct file *file, 191 unsigned int cmd, unsigned long arg) 192 { 193 return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); 194 } 195 196 static struct rt_device rtrack2_unit; 197 198 static struct file_operations rtrack2_fops = { 199 .owner = THIS_MODULE, 200 .open = video_exclusive_open, 201 .release = video_exclusive_release, 202 .ioctl = rt_ioctl, 203 .compat_ioctl = v4l_compat_ioctl32, 204 .llseek = no_llseek, 205 }; 206 207 static struct video_device rtrack2_radio= 208 { 209 .owner = THIS_MODULE, 210 .name = "RadioTrack II radio", 211 .type = VID_TYPE_TUNER, 212 .hardware = VID_HARDWARE_RTRACK2, 213 .fops = &rtrack2_fops, 214 }; 215 216 static int __init rtrack2_init(void) 217 { 218 if(io==-1) 219 { 220 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n"); 221 return -EINVAL; 222 } 223 if (!request_region(io, 4, "rtrack2")) 224 { 225 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io); 226 return -EBUSY; 227 } 228 229 rtrack2_radio.priv=&rtrack2_unit; 230 231 spin_lock_init(&lock); 232 if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1) 233 { 234 release_region(io, 4); 235 return -EINVAL; 236 } 237 238 printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n"); 239 240 /* mute card - prevents noisy bootups */ 241 outb(1, io); 242 rtrack2_unit.muted = 1; 243 244 return 0; 245 } 246 247 MODULE_AUTHOR("Ben Pfaff"); 248 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card."); 249 MODULE_LICENSE("GPL"); 250 251 module_param(io, int, 0); 252 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)"); 253 module_param(radio_nr, int, 0); 254 255 static void __exit rtrack2_cleanup_module(void) 256 { 257 video_unregister_device(&rtrack2_radio); 258 release_region(io,4); 259 } 260 261 module_init(rtrack2_init); 262 module_exit(rtrack2_cleanup_module); 263 264 /* 265 Local variables: 266 compile-command: "mmake" 267 End: 268 */ 269