/* 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 <linux/module.h>#include <linux/init.h>#include <linux/ioport.h>#include <linux/delay.h>#include <linux/sched.h>#include <asm/io.h>#include <asm/uaccess.h>#include <asm/semaphore.h>#include <linux/pci.h>#include <linux/videodev.h>#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<<1))\			/(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */#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 <<= 1;			/* shift 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 <<= 1;			/* shift 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 (*freq<FREQ_LO || *freq>FREQ_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((ofreq<FREQ2BITS(FREQ_LO)) || (ofreq>FREQ2BITS(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;   }