/* SF16FMI radio driver for Linux radio support * heavily based on rtrack driver... * (c) 1997 M. Kirkwood * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz * * Fitted to new interface by Alan Cox <alan.cox@linux.org> * Made working and cleaned up functions <mikael.hedin@irf.se> * Support for ISAPnP by Ladislav Michl <ladis@psi.cz> * * Notes on the hardware * * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); * No volume control - only mute/unmute - you have to use line volume * control on SB-part of SF16FMI * */ #include <linux/kernel.h> /* __setup */ #include <linux/module.h> /* Modules */ #include <linux/init.h> /* Initdata */ #include <linux/ioport.h> /* request_region */ #include <linux/delay.h> /* udelay */ #include <linux/videodev.h> /* kernel radio structs */ #include <linux/isapnp.h> #include <asm/io.h> /* outb, outb_p */ #include <asm/uaccess.h> /* copy to/from user */ #include <asm/semaphore.h> struct fmi_device { int port; int curvol; /* 1 or 0 */ unsigned long curfreq; /* freq in kHz */ __u32 flags; }; static int io = -1; static int radio_nr = -1; static struct pnp_dev *dev = NULL; static struct semaphore lock; /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */ /* It is only useful to give freq in intervall of 800 (=0.05Mhz), * other bits will be truncated, e.g 92.7400016 -> 92.7, but * 92.7400017 -> 92.75 */ #define RSF16_ENCODE(x) ((x)/800+214) #define RSF16_MINFREQ 87*16000 #define RSF16_MAXFREQ 108*16000 static void outbits(int bits, unsigned int data, int port) { while(bits--) { if(data & 1) { outb(5, port); udelay(6); outb(7, port); udelay(6); } else { outb(1, port); udelay(6); outb(3, port); udelay(6); } data>>=1; } } static inline void fmi_mute(int port) { down(&lock); outb(0x00, port); up(&lock); } static inline void fmi_unmute(int port) { down(&lock); outb(0x08, port); up(&lock); } static inline int fmi_setfreq(struct fmi_device *dev) { int myport = dev->port; unsigned long freq = dev->curfreq; down(&lock); outbits(16, RSF16_ENCODE(freq), myport); outbits(8, 0xC0, myport); msleep(143); /* was schedule_timeout(HZ/7) */ up(&lock); if (dev->curvol) fmi_unmute(myport); return 0; } static inline int fmi_getsigstr(struct fmi_device *dev) { int val; int res; int myport = dev->port; down(&lock); val = dev->curvol ? 0x08 : 0x00; /* unmute/mute */ outb(val, myport); outb(val | 0x10, myport); msleep(143); /* was schedule_timeout(HZ/7) */ res = (int)inb(myport+1); outb(val, myport); up(&lock); return (res & 2) ? 0 : 0xFFFF; } static int fmi_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { struct video_device *dev = video_devdata(file); struct fmi_device *fmi=dev->priv; switch(cmd) { case VIDIOCGCAP: { struct video_capability *v = arg; memset(v,0,sizeof(*v)); strcpy(v->name, "SF16-FMx radio"); v->type=VID_TYPE_TUNER; v->channels=1; v->audios=1; return 0; } case VIDIOCGTUNER: { struct video_tuner *v = arg; int mult; if(v->tuner) /* Only 1 tuner */ return -EINVAL; strcpy(v->name, "FM"); mult = (fmi->flags & VIDEO_TUNER_LOW) ? 1 : 1000; v->rangelow = RSF16_MINFREQ/mult; v->rangehigh = RSF16_MAXFREQ/mult; v->flags=fmi->flags; v->mode=VIDEO_MODE_AUTO; v->signal = fmi_getsigstr(fmi); return 0; } case VIDIOCSTUNER: { struct video_tuner *v = arg; if(v->tuner!=0) return -EINVAL; fmi->flags = v->flags & VIDEO_TUNER_LOW; /* Only 1 tuner so no setting needed ! */ return 0; } case VIDIOCGFREQ: { unsigned long *freq = arg; *freq = fmi->curfreq; if (!(fmi->flags & VIDEO_TUNER_LOW)) *freq /= 1000; return 0; } case VIDIOCSFREQ: { unsigned long *freq = arg; if (!(fmi->flags & VIDEO_TUNER_LOW)) *freq *= 1000; if (*freq < RSF16_MINFREQ || *freq > RSF16_MAXFREQ ) return -EINVAL; /*rounding in steps of 800 to match th freq that will be used */ fmi->curfreq = (*freq/800)*800; fmi_setfreq(fmi); return 0; } case VIDIOCGAUDIO: { struct video_audio *v = arg; memset(v,0,sizeof(*v)); v->flags=( (!fmi->curvol)*VIDEO_AUDIO_MUTE | VIDEO_AUDIO_MUTABLE); strcpy(v->name, "Radio"); v->mode=VIDEO_SOUND_STEREO; return 0; } case VIDIOCSAUDIO: { struct video_audio *v = arg; if(v->audio) return -EINVAL; fmi->curvol= v->flags&VIDEO_AUDIO_MUTE ? 0 : 1; fmi->curvol ? fmi_unmute(fmi->port) : fmi_mute(fmi->port); return 0; } case VIDIOCGUNIT: { struct video_unit *v = arg; v->video=VIDEO_NO_UNIT; v->vbi=VIDEO_NO_UNIT; v->radio=dev->minor; v->audio=0; /* How do we find out this??? */ v->teletext=VIDEO_NO_UNIT; return 0; } default: return -ENOIOCTLCMD; } } static int fmi_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { return video_usercopy(inode, file, cmd, arg, fmi_do_ioctl); } static struct fmi_device fmi_unit; static struct file_operations fmi_fops = { .owner = THIS_MODULE, .open = video_exclusive_open, .release = video_exclusive_release, .ioctl = fmi_ioctl, .llseek = no_llseek, }; static struct video_device fmi_radio= { .owner = THIS_MODULE, .name = "SF16FMx radio", .type = VID_TYPE_TUNER, .hardware = VID_HARDWARE_SF16MI, .fops = &fmi_fops, }; /* ladis: this is my card. does any other types exist? */ static struct isapnp_device_id id_table[] __devinitdata = { { ISAPNP_ANY_ID, ISAPNP_ANY_ID, ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0}, { ISAPNP_CARD_END, }, }; MODULE_DEVICE_TABLE(isapnp, id_table); static int isapnp_fmi_probe(void) { int i = 0; while (id_table[i].card_vendor != 0 && dev == NULL) { dev = pnp_find_dev(NULL, id_table[i].vendor, id_table[i].function, NULL); i++; } if (!dev) return -ENODEV; if (pnp_device_attach(dev) < 0) return -EAGAIN; if (pnp_activate_dev(dev) < 0) { printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n"); pnp_device_detach(dev); return -ENOMEM; } if (!pnp_port_valid(dev, 0)) { pnp_device_detach(dev); return -ENODEV; } i = pnp_port_start(dev, 0); printk ("radio-sf16fmi: PnP reports card at %#x\n", i); return i; } static int __init fmi_init(void) { if (io < 0) io = isapnp_fmi_probe(); if (io < 0) { printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n"); return io; } if (!request_region(io, 2, "radio-sf16fmi")) { printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io); return -EBUSY; } fmi_unit.port = io; fmi_unit.curvol = 0; fmi_unit.curfreq = 0; fmi_unit.flags = VIDEO_TUNER_LOW; fmi_radio.priv = &fmi_unit; init_MUTEX(&lock); if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) { release_region(io, 2); return -EINVAL; } printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io); /* mute card - prevents noisy bootups */ fmi_mute(io); return 0; } MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood"); MODULE_DESCRIPTION("A driver for the SF16MI radio."); MODULE_LICENSE("GPL"); module_param(io, int, 0); MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)"); module_param(radio_nr, int, 0); static void __exit fmi_cleanup_module(void) { video_unregister_device(&fmi_radio); release_region(io, 2); if (dev) pnp_device_detach(dev); } module_init(fmi_init); module_exit(fmi_cleanup_module);