devtv.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
  * Driver for Bt848 TV tuner.  
  *
  */
#include	"u.h"
#include	"../port/lib.h"
#include	"mem.h"
#include	"dat.h"
#include	"fns.h"
#include	"../port/error.h"
#include "io.h"
#include "hcwAMC.h"

#define max(a, b)	(((a) > (b))? (a): (b))

enum {
	Qdir = 0,
	Qsubdir,
	Qsubbase,
	Qvdata = Qsubbase,
	Qadata,
	Qctl,
	Qregs,

	Brooktree_vid = 0x109e,
	Brooktree_848_did = 0x0350,
	Brooktree_878_did = 0x036E,
	Intel_vid = 0x8086,
	Intel_82437_did = 0x122d,

	K = 1024,
	M = K * K,

	Ntvs = 4,

	Numring = 16,

	ntsc_rawpixels = 910,
	ntsc_sqpixels = 780,					// Including blanking & inactive
	ntsc_hactive = 640,
	ntsc_vactive = 480,
	ntsc_clkx1delay = 135,				// Clock ticks.
	ntsc_clkx1hactive = 754,
	ntsc_vdelay = 26,					// # of scan lines.
	ntsc_vscale = 0,

	i2c_nostop = 1 << 5,
	i2c_nos1b = 1 << 4,
	i2c_timing = 7 << 4,
	i2c_bt848w3b = 1 << 2,
	i2c_bt848scl = 1 << 1,
	i2c_bt848sda = 1 << 0,
	i2c_scl = i2c_bt848scl,
	i2c_sda = i2c_bt848sda,

	i2c_miroproee = 0x80,				// MIRO PRO EEPROM
	i2c_tea6300 = 0x80,
	i2c_tda8425 = 0x82,
	i2c_tda9840 = 0x84,
	i2c_tda9850 = 0xb6,
	i2c_haupee = 0xa0,					// Hauppage EEPROM
	i2c_stbee = 0xae,					// STB EEPROM
	i2c_msp3400 = 0x80,

	i2c_timeout = 1000,
	i2c_delay = 10,

	Bt848_miropro = 0,
	Bt848_miro,
	Bt878_hauppauge,

	// Bit fields.
	iform_muxsel1 = 3 << 5,				// 004
	iform_muxsel0 = 2 << 5,	
	iform_xtselmask = 3 << 3,
	iform_xtauto = 3 << 3,
	iform_formatmask = 7 << 0,
	iform_ntsc = 1 << 0,

	control_ldec = 1 << 5,				// 02C
	contrast_100percent = 0xd8,			// 030

	vscale_interlaced = 1 << 5,			// 04C

	adelay_ntsc = 104,					// 060
	bdelay_ntsc = 93,					// 064
	adc_crush = 1 << 0,					// 068

	colorfmt_rgb16 = (2 << 4) | (2 << 0),	// 0D4
	colorfmt_YCbCr422 = (8 << 4) | (8 << 0),
	colorfmt_YCbCr411 = (9 << 4) | (9 << 0),
	colorctl_gamma = 1 << 4,			// 0D8
	capctl_fullframe = 1 << 4,				// 0DC
	capctl_captureodd = 1 << 1,
	capctl_captureeven = 1 << 0,
	vbipacksize = 0x190,				// 0E0

	intstat_riscstatshift = 28,				// 100
	intstat_i2crack = 1 << 25,
	intstat_scerr = 1 << 19,
	intstat_ocerr = 1 << 18,
	intstat_pabort = 1 << 17,
	intstat_riperr = 1 << 16,
	intstat_pperr = 1 << 15,
	intstat_fdsr = 1 << 14,
	intstat_ftrgt = 1 << 13,
	intstat_fbus = 1 << 12,
	intstat_risci = 1 << 11,
	intstat_i2cdone = 1 << 8,	
	intstat_vpress = 1 << 5,
	intstat_hlock = 1 << 4,
	intstat_vsync = 1 << 1,
	intstat_fmtchg = 1 << 0,
	intmask_etbf = 1 << 23,				// 104

	gpiodmactl_apwrdn = 1 << 26,			// 10C
	gpiodmactl_daes2 = 1 << 13,		
	gpiodmactl_daiomda = 1 << 6,
	gpiodmactl_pltp23_16 = 2 << 6,
	gpiodmactl_pltp23_0 = 0 << 6,	
	gpiodmactl_pltp1_16 = 2 << 4,
	gpiodmactl_pltp1_0 = 0 << 4,
	gpiodmactl_acapenable = 1 << 4,
	gpiodmactl_pktp_32 = 3 << 2,		
	gpiodmactl_pktp_0 = 0 << 2,		
	gpiodmactl_riscenable = 1 << 1,
	gpiodmactl_fifoenable = 1 << 0,	

	// RISC instructions and parameters.
	fifo_vre = 0x4,
	fifo_vro = 0xc,
	fifo_fm1 = 0x6,
	fifo_fm3 = 0xe,

	riscirq = 1 << 24,
	riscwrite = 1 << 28,
	riscwrite123 = 9 << 28,
	riscwrite1s23 = 11 << 28,
		riscwrite_sol = 1 << 27,
		riscwrite_eol = 1 << 26,
	riscskip = 0x2 << 28,
	riscjmp = 0x7 << 28,
	riscsync = 0x8 << 28,
		riscsync_resync = 1 << 15,
		riscsync_vre = fifo_vre << 0,
		riscsync_vro = fifo_vro << 0,
		riscsync_fm1 = fifo_fm1 << 0,
		riscsync_fm3 = fifo_fm3 << 0,
	risclabelshift_set = 16,
	risclabelshift_reset = 20,

	AudioTuner = 0,
	AudioRadio,
	AudioExtern,
	AudioIntern,
	AudioOff,
	AudioOn,
	
	asel_tv = 0,
	asel_radio,
	asel_mic,
	asel_smxc,

	Hwbase_ad = 448000,

	msp_dem = 0x10,
	msp_bbp = 0x12,

	// Altera definitions.
	gpio_altera_data = 1 << 0,
	gpio_altera_clock = 1 << 20,
	gpio_altera_nconfig = 1 << 23,

	Ial = 0x140001,
	Idma = 0x100002,

	Adsp = 0x7fd8,
	Adsp_verifysystem = 1,
	Adsp_querysupportplay,
	Adsp_setstyle,
	Adsp_setsrate,
	Adsp_setchannels,
	Adsp_setresolution,
	Adsp_setcrcoptions,
	Adsp_bufenqfor,
	Adsp_logbuffer,
	Adsp_startplay,
	Adsp_stopplay,
	Adsp_autostop,
	Adsp_startrecord,
	Adsp_stoprecord,
	Adsp_getlastprocessed,
	Adsp_pause,
	Adsp_resume,
	Adsp_setvolume,
	Adsp_querysupportrecord,
	Adsp_generalbufenq,
	Adsp_setdownmixtype,
	Adsp_setigain,
	Adsp_setlineout,
	Adsp_setlangmixtype,

	Kfir_gc = 0,
	Kfir_dsp_riscmc,
	Kfir_dsp_risccram,
	Kfir_dsp_unitmc,
	Kfir_bsm_mc,
	Kfir_mux_mc,

	Kfir_devid_gc = 7,
	Kfir_devid_dsp = 4,
	Kfir_devid_bsm = 5,
	Kfir_devid_mux = 8,

	Kfir_200 = 200,
	Kfir_dev_inst = Kfir_200,
	Kfir_201 = 201,
	Kfir_exec = Kfir_201,
	Kfir_202 = 202,
	Kfir_adr_eready = 254,

	Kfir_d_eready_encoding = 0,
	Kfir_d_eready_ready,
	Kfir_d_eready_test,
	Kfir_d_eready_stopdetect,
	Kfir_d_eready_seqend,

	VT_KFIR_OFF = 0,
	VT_KFIR_ON,

	VT_KFIR_LAYER_II = 1,
	VT_KFIR_STEREO = 1,

	Gpioinit = 0,
	Gpiooutput,
	Gpioinput,

	Srate_5512 = 0,
	Srate_11025 = 2,
	Srate_16000 = 3,
	Srate_22050 = 4,
	Srate_32000 = 5,
	Srate_44100 = 6,
	Srate_48000 = 7,

};

typedef struct Variant Variant;
struct Variant {
	ushort		vid;
	ushort		did;
	char			*name;
};

typedef struct Bt848 Bt848;
struct Bt848 {
	ulong	devstat;		// 000
	ulong	iform;		// 004
	ulong	tdec;			// 008
	ulong	ecrop;		// 00C
	ulong	evdelaylo;		// 010
	ulong	evactivelo;	// 014
	ulong	ehdelaylo;		// 018
	ulong	ehactivelo;	// 01C
	ulong	ehscalehi;		// 020
	ulong	ehscalelo;		// 024
	ulong	bright;		// 028
	ulong	econtrol;		// 02C
	ulong	contrastlo;	// 030
	ulong	satulo;		// 034
	ulong	satvlo;		// 038
	ulong	hue;			// 03C
	ulong	escloop;		// 040
	ulong	pad0;		// 044
	ulong	oform;		// 048
	ulong	evscalehi;		// 04C
	ulong	evscalelo;		// 050
	ulong	test;			// 054
	ulong	pad1[2];		// 058-05C
	ulong	adelay;		// 060
	ulong	bdelay;		// 064
	ulong	adc;			// 068
	ulong	evtc;			// 06C
	ulong	pad2[3];		// 070-078
	ulong	sreset;		// 07C
	ulong	tglb;			// 080
	ulong	tgctrl;		// 084
	ulong	pad3;		// 088
	ulong	ocrop;		// 08C
	ulong	ovdelaylo;		// 090
	ulong	ovactivelo;	// 094
	ulong	ohdelaylo;	// 098
	ulong	ohactivelo;	// 09C
	ulong	ohscalehi;		// 0A0
	ulong	ohscalelo;		// 0A4
	ulong	pad4;		// 0A8
	ulong	ocontrol;		// 0AC
	ulong	pad5[4];		// 0B0-0BC
	ulong	oscloop;		// 0C0
	ulong	pad6[2];		// 0C4-0C8
	ulong	ovscalehi;		// 0CC
	ulong	ovscalelo;		// 0D0
	ulong	colorfmt;		// 0D4
	ulong	colorctl;		// 0D8
	ulong	capctl;		// 0DC
	ulong	vbipacksize;	// 0E0
	ulong	vbipackdel;	// 0E4
	ulong	fcap;			// 0E8
	ulong	ovtc;			// 0EC
	ulong	pllflo;		// 0F0
	ulong	pllfhi;		// 0F4
	ulong	pllxci;		// 0F8
	ulong	dvsif;		// 0FC
	ulong	intstat;		// 100
	ulong	intmask;		// 104
	ulong	pad7;		// 108
	ulong	gpiodmactl;	// 10C
	ulong	i2c;			// 110
	ulong	riscstrtadd;	// 114
	ulong	gpioouten;	// 118
	ulong	gpioreginp;	// 11C
	ulong	risccount;		// 120
	ulong	pad8[55];		// 124-1FC	
	ulong	gpiodata[64];	// 200-2FC
};

#define packetlen	i2c

typedef struct Tuner Tuner;
struct Tuner {
	char		*name;
  	ushort	freq_vhfh;	// Start frequency
	ushort	freq_uhf;  
	uchar	VHF_L;
	uchar	VHF_H;
	uchar	UHF;
	uchar	cfg; 
	ushort	offs;
};

typedef struct Frame Frame;
struct Frame {
	ulong	*fstart;
	ulong	*fjmp;
	uchar	*fbase;
};

typedef struct Tv Tv;
struct Tv {
	Lock;
	Rendez;
	Bt848	*bt848;
	Bt848	*bt878;			// Really only audio control registers
	Variant	*variant;
	Tuner	*tuner;
	Pcidev	*pci;
	uchar	i2ctuneraddr;
	uchar	i2ccmd;			// I2C command
	int		board;			// What board is this?
	ulong	cfmt;			// Current color format.
	int		channel;			// Current channel
	Ref		fref;				// Copying images?
	int		nframes;			// Number of frames to capture.
	Frame	*frames;			// DMA program
	int		lvframe;			// Last video frame DMAed
	uchar	*amux;			// Audio multiplexer.
	int		nablocks;			// Number of audio blocks allocated
	int		absize;			// Audio block size
	int		narblocks;		// Number of audio blocks received
	ulong	*arisc;			// Audio risc bloc
	uchar	*abuf;			// Audio data buffers
	char		ainfo[128];

	// WinTV/PVR stuff.
	int		msp;	
	Lock		kfirlock;
	ulong	i2cstate;			// Last i2c state.
	int		gpiostate;			// Current GPIO state
	ulong	alterareg;			// Last used altera register
	ulong	alteraclock;		// Used to clock the altera
	int		asrate;			// Audio sample rate
	uchar	aleft, aright;		// Left and right audio volume
	ulong	kfirclock;
	Ref		aref;				// Copying audio?
};

enum {
	TemicPAL = 0,
	PhilipsPAL,
	PhilipsNTSC,
	PhilipsSECAM,
	Notuner,
	PhilipsPALI,
	TemicNTSC,
	TemicPALI,
	Temic4036,
	AlpsTSBH1,
	AlpsTSBE1,

	Freqmultiplier = 16,
};

static Tuner tuners[] = {
        {"Temic PAL", Freqmultiplier * 140.25, Freqmultiplier * 463.25, 
		0x02, 0x04, 0x01, 0x8e, 623 },
	{"Philips PAL_I", Freqmultiplier * 140.25, Freqmultiplier * 463.25, 
		0xa0, 0x90, 0x30, 0x8e, 623 },
	{"Philips NTSC",  Freqmultiplier * 157.25, Freqmultiplier * 451.25, 
		0xA0, 0x90, 0x30, 0x8e, 732 },
	{"Philips SECAM", Freqmultiplier * 168.25, Freqmultiplier * 447.25, 
		0xA7, 0x97, 0x37, 0x8e, 623 },
	{"NoTuner", 0, 0, 
		0x00, 0x00, 0x00, 0x00, 0 },
	{"Philips PAL", Freqmultiplier * 168.25, Freqmultiplier * 447.25, 
		0xA0, 0x90, 0x30, 0x8e, 623 },
	{"Temic NTSC", Freqmultiplier * 157.25, Freqmultiplier * 463.25, 
		0x02, 0x04, 0x01, 0x8e, 732 },
	{"TEMIC PAL_I", Freqmultiplier * 170.00, Freqmultiplier * 450.00, 
		0x02, 0x04, 0x01, 0x8e, 623 },
	{"Temic 4036 FY5 NTSC", Freqmultiplier * 157.25, Freqmultiplier * 463.25, 
		0xa0, 0x90, 0x30, 0x8e, 732 },
	{"Alps TSBH1", Freqmultiplier * 137.25, Freqmultiplier * 385.25, 
		0x01, 0x02, 0x08, 0x8e, 732 },
	{"Alps TSBE1", Freqmultiplier * 137.25, Freqmultiplier * 385.25, 
		0x01, 0x02, 0x08, 0x8e, 732 },
};

static int hp_tuners[] = {
	Notuner,  
        	Notuner,    
        	Notuner,  
        	Notuner,  
        	Notuner,    
        	PhilipsNTSC,  
        	Notuner,   
        	Notuner,    
        	PhilipsPAL,   
        	PhilipsSECAM, 
        	PhilipsNTSC,
        	PhilipsPALI, 
        	Notuner,        
        	Notuner,    
        	TemicPAL,     
        	TemicPALI,   
        	Notuner,        
        	PhilipsSECAM, 
        	PhilipsNTSC, 
        	PhilipsPALI, 
        	Notuner,     
        	PhilipsPAL, 
        	Notuner,       
        	PhilipsNTSC,
};

enum {
	CMvstart,
	CMastart,
	CMastop,
	CMvgastart,
	CMvstop,
	CMchannel,
	CMcolormode,
	CMvolume,
	CMmute,
};

static Cmdtab tvctlmsg[] = {
	CMvstart,			"vstart",			2,
	CMastart,			"astart",			5,
	CMastop,			"astop",			1,
	CMvgastart,		"vgastart",		3,
	CMvstop,			"vstop",			1,
	CMchannel,		"channel",			3,
	CMcolormode,		"colormode",		2,
	CMvolume,		"volume",			3,
	CMmute,			"mute",			1,
};

static Variant variant[] = {
{	Brooktree_vid,	Brooktree_848_did,	"Brooktree 848 TV tuner",	},
{	Brooktree_vid,	Brooktree_878_did,	"Brooktree 878 TV tuner",	},
};

static char *boards[] = {
	"MIRO PRO",
	"MIRO",
	"Hauppauge Bt878",
};

static ushort Adspfsample[] = {
	0x500, 0x700, 0x400, 0x600, 0x300, 0x200, 0x000, 0x100
};
static ushort Adspstereorates[] = {
	64, 96, 112, 128, 160, 192, 224, 256, 320, 384
};

static uchar miroamux[] = { 2, 0, 0, 0, 10, 0 };
static uchar hauppaugeamux[] = { 0, 1, 2, 3, 4, 0 };
static char *nicamstate[] = {
	"analog", "???", "digital", "bad digital receiption" 
};


static Tv tvs[Ntvs];
static int ntvs;

static int i2cread(Tv *, uchar, uchar *);
static int i2cwrite(Tv *, uchar, uchar, uchar, int);
static void tvinterrupt(Ureg *, Tv *);
static void vgastart(Tv *, ulong, int);
static void vstart(Tv *, int, int, int, int);
static void astart(Tv *, char *, uint, uint, uint);
static void vstop(Tv *);
static void astop(Tv *);
static void colormode(Tv *, char *);
static void frequency(Tv *, int, int);
static int getbitspp(Tv *);
static char *getcolormode(ulong);
static int mspreset(Tv *);
static void i2cscan(Tv *);
static int kfirinitialize(Tv *);
static void msptune(Tv *);
static void mspvolume(Tv *, int, int, int);
static void gpioenable(Tv *, ulong, ulong);
static void gpiowrite(Tv *, ulong, ulong);

static void
tvinit(void)
{
	Pcidev *pci;
	ulong intmask;

	// Test for a triton memory controller.
	intmask = 0;
	if (pcimatch(nil, Intel_vid, Intel_82437_did))
		intmask = intmask_etbf;

	pci = nil;
	while ((pci = pcimatch(pci, 0, 0)) != nil) {
		int i, t;
		Tv *tv;
		Bt848 *bt848;
		ushort hscale, hdelay;
		uchar v;

		for (i = 0; i != nelem(variant); i++)
			if (pci->vid == variant[i].vid && pci->did == variant[i].did)
				break;
		if (i == nelem(variant))
			continue;

		if (ntvs >= Ntvs) {
			print("#V: Too many TV cards found\n");
			continue;
		}

		tv = &tvs[ntvs++];
		tv->variant = &variant[i];
		tv->pci = pci;
		tv->bt848 = (Bt848 *)vmap(pci->mem[0].bar & ~0x0F, 4 * K);
		if (tv->bt848 == nil)
			panic("#V: Cannot allocate memory for Bt848");
		bt848 = tv->bt848;

		// i2c stuff.
		if (pci->did >= 878)
			tv->i2ccmd = 0x83;
		else 
			tv->i2ccmd = i2c_timing | i2c_bt848scl | i2c_bt848sda;

		t = 0;
		if (i2cread(tv, i2c_haupee, &v)) {
			uchar ee[256];
			Pcidev *pci878;
			Bt848 *bt878;

			tv->board = Bt878_hauppauge;
			if (!i2cwrite(tv, i2c_haupee, 0, 0, 0))
				panic("#V: Cannot write to Hauppauge EEPROM");
			for (i = 0; i != sizeof ee; i++)
				if (!i2cread(tv, i2c_haupee + 1, &ee[i]))
					panic("#V: Cannot read from Hauppauge EEPROM");

			if (ee[9] > sizeof hp_tuners / sizeof hp_tuners[0])
				panic("#V: Tuner out of range (max %d, this %d)",
					sizeof hp_tuners / sizeof hp_tuners[0], ee[9]);
			t = hp_tuners[ee[9]];

			// Initialize the audio channel.
			if ((pci878 = pcimatch(nil, Brooktree_vid, 0x878)) == nil)
				panic("#V: Unsupported Hauppage board");

			tv->bt878 = bt878 = 
				(Bt848 *)vmap(pci878->mem[0].bar & ~0x0F, 4 * K);
			if (bt878 == nil)
				panic("#V: Cannot allocate memory for the Bt878");

			kfirinitialize(tv);
			// i2cscan(tv);
			mspreset(tv);

			bt878->gpiodmactl = 0;
			bt878->intstat = (ulong)-1;
			intrenable(pci878->intl, (void (*)(Ureg *, void *))tvinterrupt, 
					tv, pci878->tbdf, "tv");	

			tv->amux = hauppaugeamux;
		}
		else if (i2cread(tv, i2c_stbee, &v)) {
			USED(t);
			panic("#V: Cannot deal with STB cards\n");
		}
		else if (i2cread(tv, i2c_miroproee, &v)) {
			tv->board = Bt848_miropro;
			t = ((bt848->gpiodata[0] >> 10) - 1) & 7;
			tv->amux = miroamux;
		}
		else {
			tv->board = Bt848_miro;
			tv->amux = miroamux;
			t = ((bt848->gpiodata[0] >> 10) - 1) & 7;
		}

		if (t >= nelem(tuners))
			t = 4;
		tv->tuner = &tuners[t];
		tv->i2ctuneraddr = 
			i2cread(tv, 0xc1, &v)? 0xc0:
			i2cread(tv, 0xc3, &v)? 0xc2:
			i2cread(tv, 0xc5, &v)? 0xc4:
			i2cread(tv, 0xc7, &v)? 0xc6: -1;

		bt848->capctl = capctl_fullframe;
		bt848->adelay = adelay_ntsc;
		bt848->bdelay = bdelay_ntsc;
		bt848->iform = iform_muxsel0|iform_xtauto|iform_ntsc;
		bt848->vbipacksize = vbipacksize & 0xff;
		bt848->vbipackdel = (vbipacksize >> 8) & 1;

		// setpll(bt848);

		tv->cfmt = bt848->colorfmt = colorfmt_rgb16;

		hscale = (ntsc_rawpixels * 4096) / ntsc_sqpixels - 4096;
		hdelay = (ntsc_clkx1delay * ntsc_hactive) / ntsc_clkx1hactive;

		bt848->ovtc = bt848->evtc = 0;
		bt848->ehscalehi = bt848->ohscalehi = (hscale >> 8) & 0xff;
		bt848->ehscalelo = bt848->ohscalelo = hscale & 0xff;
		bt848->evscalehi &= ~0x1f;
		bt848->ovscalehi &= ~0x1f;
		bt848->evscalehi |= vscale_interlaced | ((ntsc_vscale >> 8) & 0x1f);
		bt848->ovscalehi |= vscale_interlaced | (ntsc_vscale >> 8) & 0x1f;
		bt848->evscalelo = bt848->ovscalelo = ntsc_vscale & 0xff;
		bt848->ehactivelo = bt848->ohactivelo = ntsc_hactive & 0xff;
		bt848->ehdelaylo = bt848->ohdelaylo = hdelay & 0xff;
		bt848->evactivelo = bt848->ovactivelo = ntsc_vactive & 0xff;
		bt848->evdelaylo = bt848->ovdelaylo = ntsc_vdelay & 0xff;
		bt848->ecrop = bt848->ocrop = 
			((ntsc_hactive >> 8) & 0x03) |
			((hdelay >> 6) & 0x0C) |
	        		((ntsc_vactive >> 4) & 0x30) |
			((ntsc_vdelay >> 2) & 0xC0);	

		bt848->colorctl = colorctl_gamma;
		bt848->capctl = 0;
		bt848->gpiodmactl = gpiodmactl_pltp23_16 |
			gpiodmactl_pltp1_16 | gpiodmactl_pktp_32;
		bt848->gpioreginp = 0;
		bt848->contrastlo = contrast_100percent;
		bt848->bright = 16;
		bt848->adc = (2 << 6) | adc_crush;
		bt848->econtrol = bt848->ocontrol = control_ldec;
		bt848->escloop = bt848->oscloop = 0;
		bt848->intstat = (ulong)-1;
		bt848->intmask = intmask | 
			intstat_vsync | intstat_scerr | intstat_risci | intstat_ocerr | 
			intstat_vpress | intstat_fmtchg;


		if (tv->amux) {
			gpioenable(tv, ~0xfff, 0xfff);
			gpiowrite(tv, ~0xfff, tv->amux[AudioRadio]);
		}

		print("#V%ld: %s (rev %d) (%s/%s) intl %d\n", 
				tv - tvs, tv->variant->name, pci->rid, boards[tv->board],
				tv->tuner->name, pci->intl);

		intrenable(pci->intl, (void (*)(Ureg *, void *))tvinterrupt, 
				tv, pci->tbdf, "tv");	
	}
}

static Chan*
tvattach(char *spec)
{
	return devattach('V', spec);
}

#define TYPE(q)		((int)((q).path & 0xff))
#define DEV(q)			((int)(((q).path >> 8) & 0xff))
#define QID(d, t)		((((d) & 0xff) << 8) | (t))

static int
tv1gen(Chan *c, int i, Dir *dp)
{
	Qid qid;

	switch (i) {
	case Qvdata:
		mkqid(&qid, QID(DEV(c->qid), Qvdata), 0, QTFILE);
		devdir(c, qid, "video", 0, eve, 0444, dp);
		return 1;
	case Qadata:
		mkqid(&qid, QID(DEV(c->qid), Qadata), 0, QTFILE);
		devdir(c, qid, "audio", 0, eve, 0444, dp);
		return 1;
	case Qctl:
		mkqid(&qid, QID(DEV(c->qid), Qctl), 0, QTFILE);
		devdir(c, qid, "ctl", 0, eve, 0444, dp);
		return 1;
	case Qregs:
		mkqid(&qid, QID(DEV(c->qid), Qregs), 0, QTFILE);
		devdir(c, qid, "regs", 0, eve, 0444, dp);
		return 1;
	}
	return -1;
}

static int
tvgen(Chan *c, char *, Dirtab *, int, int i, Dir *dp)
{
	Qid qid;
	int dev;