/* Maestro PCI sound card radio driver for Linux support * (c) 2000 A. Tlalka, atlka@pg.gda.pl * Notes on the hardware * * + Frequency control is done digitally * + No volume control - only mute/unmute - you have to use Aux line volume * control on Maestro card to set the volume * + Radio status (tuned/not_tuned and stereo/mono) is valid some time after * frequency setting (>100ms) and only when the radio is unmuted. * version 0.02 * + io port is automatically detected - only the first radio is used * version 0.03 * + thread access locking additions * version 0.04 * + code improvements * + VIDEO_TUNER_LOW is permanent */ #include #include #include #include #include #include #include #include #include #include #define DRIVER_VERSION "0.04" #define PCI_VENDOR_ESS 0x125D #define PCI_DEVICE_ID_ESS_ESS1968 0x1968 /* Maestro 2 */ #define PCI_DEVICE_ID_ESS_ESS1978 0x1978 /* Maestro 2E */ #define GPIO_DATA 0x60 /* port offset from ESS_IO_BASE */ #define IO_MASK 4 /* mask register offset from GPIO_DATA bits 1=unmask write to given bit */ #define IO_DIR 8 /* direction register offset from GPIO_DATA bits 0/1=read/write direction */ #define GPIO6 0x0040 /* mask bits for GPIO lines */ #define GPIO7 0x0080 #define GPIO8 0x0100 #define GPIO9 0x0200 #define STR_DATA GPIO6 /* radio TEA5757 pins and GPIO bits */ #define STR_CLK GPIO7 #define STR_WREN GPIO8 #define STR_MOST GPIO9 #define FREQ_LO 50*16000 #define FREQ_HI 150*16000 #define FREQ_IF 171200 /* 10.7*16000 */ #define FREQ_STEP 200 /* 12.5*16 */ #define FREQ2BITS(x) ((((unsigned int)(x)+FREQ_IF+(FREQ_STEP /(FREQ_STEP #define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF) static int radio_nr = -1; MODULE_PARM(radio_nr, "i"); static int radio_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg); static struct file_operations maestro_fops = { .owner = THIS_MODULE, .open = video_exclusive_open, .release = video_exclusive_release, .ioctl = radio_ioctl, .llseek = no_llseek, }; static struct video_device maestro_radio= { .owner = THIS_MODULE, .name = "Maestro radio", .type = VID_TYPE_TUNER, .hardware = VID_HARDWARE_SF16MI, .fops = &maestro_fops, }; static struct radio_device { __u16 io, /* base of Maestro card radio io (GPIO_DATA)*/ muted, /* VIDEO_AUDIO_MUTE */ stereo, /* VIDEO_TUNER_STEREO_ON */ tuned; /* signal strength (0 or 0xffff) */ struct semaphore lock; } radio_unit = {0, 0, 0, 0, }; static void sleep_125ms(void) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(HZ >> 3); } static void udelay2(void) { udelay(2); } static void udelay4(void) { udelay(4); } static void udelay16(void) { udelay(16); } static __u32 radio_bits_get(struct radio_device *dev) { register __u16 io=dev->io, l, rdata; register __u32 data=0; __u16 omask; omask = inw(io + IO_MASK); outw(~(STR_CLK | STR_WREN), io + IO_MASK); outw(0, io); udelay16(); for (l=24;l--;) { outw(STR_CLK, io); /* HI state */ udelay2(); if(!l) dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff; outw(0, io); /* LO state */ udelay2(); data rdata = inw(io); if(!l) dev->stereo = rdata & STR_MOST ? 0 : VIDEO_TUNER_STEREO_ON; else if(rdata & STR_DATA) data++; udelay2(); } if(dev->muted) outw(STR_WREN, io); udelay4(); outw(omask, io + IO_MASK); return data & 0x3ffe; } static void radio_bits_set(struct radio_device *dev, __u32 data) { register __u16 io=dev->io, l, bits; __u16 omask, odir; omask = inw(io + IO_MASK); odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN); outw(odir | STR_DATA, io + IO_DIR); outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK); udelay16(); for (l=25;l;l--) { bits = ((data >> 18) & STR_DATA) | STR_WREN ; data outw(bits, io); /* start strobe */ udelay2(); outw(bits | STR_CLK, io); /* HI level */ udelay2(); outw(bits, io); /* LO level */ udelay4(); } if(!dev->muted) outw(0, io); udelay4(); outw(omask, io + IO_MASK); outw(odir, io + IO_DIR); sleep_125ms(); } inline static int radio_function(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { struct video_device *dev = video_devdata(file); struct radio_device *card=dev->priv; switch(cmd) { case VIDIOCGCAP: { struct video_capability *v = arg; memset(v,0,sizeof(*v)); strcpy(v->name, "Maestro radio"); v->type=VID_TYPE_TUNER; v->channels=v->audios=1; return 0; } case VIDIOCGTUNER: { struct video_tuner *v = arg; if(v->tuner) return -EINVAL; (void)radio_bits_get(card); v->flags = VIDEO_TUNER_LOW | card->stereo; v->signal = card->tuned; strcpy(v->name, "FM"); v->rangelow = FREQ_LO; v->rangehigh = FREQ_HI; v->mode = VIDEO_MODE_AUTO; return 0; } case VIDIOCSTUNER: { struct video_tuner *v = arg; if(v->tuner!=0) return -EINVAL; return 0; } case VIDIOCGFREQ: { unsigned long *freq = arg; *freq = BITS2FREQ(radio_bits_get(card)); return 0; } case VIDIOCSFREQ: { unsigned long *freq = arg; if (*freqFREQ_HI ) return -EINVAL; radio_bits_set(card, FREQ2BITS(*freq)); return 0; } case VIDIOCGAUDIO: { struct video_audio *v = arg; memset(v,0,sizeof(*v)); strcpy(v->name, "Radio"); v->flags=VIDEO_AUDIO_MUTABLE | card->muted; v->mode=VIDEO_SOUND_STEREO; return 0; } case VIDIOCSAUDIO: { struct video_audio *v = arg; if(v->audio) return -EINVAL; { register __u16 io=card->io; register __u16 omask = inw(io + IO_MASK); outw(~STR_WREN, io + IO_MASK); outw((card->muted = v->flags & VIDEO_AUDIO_MUTE) ? STR_WREN : 0, io); udelay4(); outw(omask, io + IO_MASK); sleep_125ms(); 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; v->teletext=VIDEO_NO_UNIT; return 0; } default: return -ENOIOCTLCMD; } } static int radio_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct video_device *dev = video_devdata(file); struct radio_device *card=dev->priv; int ret; down(&card->lock); ret = video_usercopy(inode, file, cmd, arg, radio_function); up(&card->lock); return ret; } inline static __u16 radio_install(struct pci_dev *pcidev); MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl"); MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio."); MODULE_LICENSE("GPL"); void __exit maestro_radio_exit(void) { video_unregister_device(&maestro_radio); } int __init maestro_radio_init(void) { register __u16 found=0; struct pci_dev *pcidev = NULL; while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS, PCI_DEVICE_ID_ESS_ESS1968, pcidev))) found |= radio_install(pcidev); while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS, PCI_DEVICE_ID_ESS_ESS1978, pcidev))) found |= radio_install(pcidev); if(!found) { printk(KERN_INFO "radio-maestro: no devices found.\n"); return -ENODEV; } return 0; } module_init(maestro_radio_init); module_exit(maestro_radio_exit); inline static __u16 radio_power_on(struct radio_device *dev) { register __u16 io=dev->io; register __u32 ofreq; __u16 omask, odir; omask = inw(io + IO_MASK); odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN); outw(odir & ~STR_WREN, io + IO_DIR); dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE; outw(odir, io + IO_DIR); outw(~(STR_WREN | STR_CLK), io + IO_MASK); outw(dev->muted ? 0 : STR_WREN, io); udelay16(); outw(omask, io + IO_MASK); ofreq = radio_bits_get(dev); if((ofreqFREQ2BITS(FREQ_HI))) ofreq = FREQ2BITS(FREQ_LO); radio_bits_set(dev, ofreq); return (ofreq == radio_bits_get(dev)); } inline static __u16 radio_install(struct pci_dev *pcidev) { if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO) return 0; radio_unit.io = pcidev->resource[0].start + GPIO_DATA; maestro_radio.priv = &radio_unit; init_MUTEX(&radio_unit.lock); if(radio_power_on(&radio_unit)) { if(video_register_device(&maestro_radio, VFL_TYPE_RADIO, radio_nr)==-1) { printk("radio-maestro: can't register device!"); return 0; } printk(KERN_INFO "radio-maestro: version " DRIVER_VERSION " time " __TIME__ " " __DATE__ "\n"); printk(KERN_INFO "radio-maestro: radio chip initialized\n"); return 1; } else return 0; }
