msp3400.c

这是一个市场上常见电视卡的驱动程序源代码

/*
 * programming the msp34* sound processor family
 *
 * (c) 1997-2001 Gerd Knorr <[e-mail]>
 *
 * what works and what doesn't:
 *
 *  AM-Mono
 *      Support for Hauppauge cards added (decoding handled by tuner) added by
 *      Frederic Crozat <[e-mail]>
 *
 *  FM-Mono
 *      should work. The stereo modes are backward compatible to FM-mono,
 *      therefore FM-Mono should be allways available.
 *
 *  FM-Stereo (B/G, used in germany)
 *      should work, with autodetect
 *
 *  FM-Stereo (satellite)
 *      should work, no autodetect (i.e. default is mono, but you can
 *      switch to stereo -- untested)
 *
 *  NICAM (B/G, L , used in UK, Scandinavia, Spain and France)
 *      should work, with autodetect. Support for NICAM was added by
 *      Pekka Pietikainen <[e-mail]>
 *
 *
 * TODO:
 *   - better SAT support
 *
 *
 * 980623  Thomas Sailer ([e-mail])
 *         using soundcore instead of OSS
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/videodev.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <asm/semaphore.h>
#include <asm/pgtable.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
#include "audiochip.h"
#include "i2c-compat.h"
#else
#include <media/audiochip.h>
#endif
#include "msp3400.h"

/* insmod parameters */
static int debug    = 0;    /* debug output */
static int once     = 0;    /* no continous stereo monitoring */
static int amsound  = 0;    /* hard-wire AM sound at 6.5 Hz (france),
			      the autoscan seems work well only with FM... */
static int simple   = -1;   /* use short programming (>= msp3410 only) */
static int dolby    = 0;

#define DFP_COUNT 0x41
static const int bl_dfp[] = {
	0x00, 0x01, 0x02, 0x03,  0x06, 0x08, 0x09, 0x0a,
	0x0b, 0x0d, 0x0e, 0x10
};

struct msp3400c {
	int rev1,rev2;
	
	int simple;
	int mode;
	int norm;
	int stereo;
	int nicam_on;
	int acb;
	int main, second;	/* sound carrier */
	int input;

	int muted;
	int left, right;	/* volume */
	int bass, treble;

	/* shadow register set */
	int dfp_regs[DFP_COUNT];

	/* thread */
	struct task_struct  *thread;
	wait_queue_head_t    wq;

	struct semaphore    *notify;
	int                  active,restart,rmmod;

	int                  watch_stereo;
	struct timer_list    wake_stereo;
};

#define HAVE_NICAM(msp)   (((msp->rev2>>8) & 0xff) != 00)
#define HAVE_SIMPLE(msp)  ((msp->rev1      & 0xff) >= 'D'-'@')
#define HAVE_RADIO(msp)   ((msp->rev1      & 0xff) >= 'G'-'@')

#define MSP3400_MAX 4
static struct i2c_client *msps[MSP3400_MAX];

#define VIDEO_MODE_RADIO 16      /* norm magic for radio mode */

/* ---------------------------------------------------------------------- */

#define dprintk     if (debug) printk

MODULE_PARM(once,"i");
MODULE_PARM(debug,"i");
MODULE_PARM(simple,"i");
MODULE_PARM(amsound,"i");
MODULE_PARM(dolby,"i");

MODULE_DESCRIPTION("device driver for msp34xx TV sound processor");
MODULE_AUTHOR("Gerd Knorr");
MODULE_LICENSE("Dual BSD/GPL"); /* FreeBSD uses this too */

/* ---------------------------------------------------------------------- */

#define I2C_MSP3400C       0x80
#define I2C_MSP3400C_ALT   0x88

#define I2C_MSP3400C_DEM   0x10
#define I2C_MSP3400C_DFP   0x12

/* Addresses to scan */
static unsigned short normal_i2c[] = {
	I2C_MSP3400C      >> 1,
	I2C_MSP3400C_ALT  >> 1,
	I2C_CLIENT_END
};
static unsigned short normal_i2c_range[] = {I2C_CLIENT_END,I2C_CLIENT_END};
I2C_CLIENT_INSMOD;

/* ----------------------------------------------------------------------- */
/* functions for talking to the MSP3400C Sound processor                   */

#ifndef I2C_M_IGNORE_NAK
# define I2C_M_IGNORE_NAK 0x1000
#endif

static int msp3400c_reset(struct i2c_client *client)
{
	/* reset and read revision code */
	static char reset_off[3] = { 0x00, 0x80, 0x00 };
	static char reset_on[3]  = { 0x00, 0x00, 0x00 };
	static char write[3]     = { I2C_MSP3400C_DFP + 1, 0x00, 0x1e };
	char read[2];
	struct i2c_msg reset[2] = {
		{ client->addr, I2C_M_IGNORE_NAK, 3, reset_off },
		{ client->addr, I2C_M_IGNORE_NAK, 3, reset_on  },
	};
	struct i2c_msg test[2] = {
		{ client->addr, 0,        3, write },
		{ client->addr, I2C_M_RD, 2, read  },
	};
	
	if ( (1 != i2c_transfer(client->adapter,&reset[0],1)) ||
	     (1 != i2c_transfer(client->adapter,&reset[1],1)) ||
	     (2 != i2c_transfer(client->adapter,test,2)) ) {
		printk(KERN_ERR "msp3400: chip reset failed\n");
		return -1;
        }
	return 0; 
}

static int
msp3400c_read(struct i2c_client *client, int dev, int addr)
{
	int err;

        unsigned char write[3];
        unsigned char read[2];
        struct i2c_msg msgs[2] = {
                { client->addr, 0,        3, write },
                { client->addr, I2C_M_RD, 2, read  }
        };
        write[0] = dev+1;
        write[1] = addr >> 8;
        write[2] = addr & 0xff;

	for (err = 0; err < 3;) {
		if (2 == i2c_transfer(client->adapter,msgs,2))
			break;
		err++;
		printk(KERN_WARNING "msp34xx: I/O error #%d (read 0x%02x/0x%02x)\n",
		       err, dev, addr);
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(HZ/10);
	}
	if (3 == err) {
		printk(KERN_WARNING "msp34xx: giving up, reseting chip. Sound will go off, sorry folks :-|\n");
		msp3400c_reset(client);
		return -1;
	}
        return read[0] << 8 | read[1];
}

static int
msp3400c_write(struct i2c_client *client, int dev, int addr, int val)
{
	int err;
        unsigned char buffer[5];

        buffer[0] = dev;
        buffer[1] = addr >> 8;
        buffer[2] = addr &  0xff;
        buffer[3] = val  >> 8;
        buffer[4] = val  &  0xff;

	for (err = 0; err < 3;) {
		if (5 == i2c_master_send(client, buffer, 5))
			break;
		err++;
		printk(KERN_WARNING "msp34xx: I/O error #%d (write 0x%02x/0x%02x)\n",
		       err, dev, addr);
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(HZ/10);
	}
	if (3 == err) {
		printk(KERN_WARNING "msp34xx: giving up, reseting chip. Sound will go off, sorry folks :-|\n");
		msp3400c_reset(client);
		return -1;
	}
	return 0;
}

/* ------------------------------------------------------------------------ */

/* This macro is allowed for *constants* only, gcc must calculate it
   at compile time.  Remember -- no floats in kernel mode */
#define MSP_CARRIER(freq) ((int)((float)(freq/18.432)*(1<<24)))

#define MSP_MODE_AM_DETECT   0
#define MSP_MODE_FM_RADIO    2
#define MSP_MODE_FM_TERRA    3
#define MSP_MODE_FM_SAT      4
#define MSP_MODE_FM_NICAM1   5
#define MSP_MODE_FM_NICAM2   6
#define MSP_MODE_AM_NICAM    7
#define MSP_MODE_BTSC        8
#define MSP_MODE_EXTERN      9

static struct MSP_INIT_DATA_DEM {
	int fir1[6];
	int fir2[6];
	int cdo1;
	int cdo2;
	int ad_cv;
	int mode_reg;
	int dfp_src;
	int dfp_matrix;
} msp_init_data[] = {
	/* AM (for carrier detect / msp3400) */
	{ { 75, 19, 36, 35, 39, 40 }, { 75, 19, 36, 35, 39, 40 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0500,   0x0020, 0x3000},

	/* AM (for carrier detect / msp3410) */
	{ { -1, -1, -8, 2, 59, 126 }, { -1, -1, -8, 2, 59, 126 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0100,   0x0020, 0x3000},

	/* FM Radio */
	{ { -8, -8, 4, 6, 78, 107 }, { -8, -8, 4, 6, 78, 107 },
	  MSP_CARRIER(10.7), MSP_CARRIER(10.7),
	  0x00d0, 0x0480, 0x0020, 0x3000 },

	/* Terrestial FM-mono + FM-stereo */
	{ {  3, 18, 27, 48, 66, 72 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0480,   0x0030, 0x3000},

	/* Sat FM-mono */
	{ {  1,  9, 14, 24, 33, 37 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(6.5), MSP_CARRIER(6.5),
	  0x00c6, 0x0480,   0x0000, 0x3000},

	/* NICAM/FM --  B/G (5.5/5.85), D/K (6.5/5.85) */
	{ { -2, -8, -10, 10, 50, 86 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0040,   0x0120, 0x3000},

	/* NICAM/FM -- I (6.0/6.552) */
	{ {  2, 4, -6, -4, 40, 94 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(6.0), MSP_CARRIER(6.0),
	  0x00d0, 0x0040,   0x0120, 0x3000},

	/* NICAM/AM -- L (6.5/5.85) */
	{ {  -2, -8, -10, 10, 50, 86 }, {  -4, -12, -9, 23, 79, 126 },
	  MSP_CARRIER(6.5), MSP_CARRIER(6.5),
	  0x00c6, 0x0140,   0x0120, 0x7c03},
};

struct CARRIER_DETECT {
	int   cdo;
	char *name;
};

static struct CARRIER_DETECT carrier_detect_main[] = {
	/* main carrier */
	{ MSP_CARRIER(4.5),        "4.5   NTSC"                   }, 
	{ MSP_CARRIER(5.5),        "5.5   PAL B/G"                }, 
	{ MSP_CARRIER(6.0),        "6.0   PAL I"                  },
	{ MSP_CARRIER(6.5),        "6.5   PAL D/K + SAT + SECAM"  }
};

static struct CARRIER_DETECT carrier_detect_55[] = {
	/* PAL B/G */
	{ MSP_CARRIER(5.7421875),  "5.742 PAL B/G FM-stereo"     }, 
	{ MSP_CARRIER(5.85),       "5.85  PAL B/G NICAM"         }
};

static struct CARRIER_DETECT carrier_detect_65[] = {
	/* PAL SAT / SECAM */
	{ MSP_CARRIER(5.85),       "5.85  PAL D/K + SECAM NICAM" },
	{ MSP_CARRIER(6.2578125),  "6.25  PAL D/K1 FM-stereo" },
	{ MSP_CARRIER(6.7421875),  "6.74  PAL D/K2 FM-stereo" },
	{ MSP_CARRIER(7.02),       "7.02  PAL SAT FM-stereo s/b" },
	{ MSP_CARRIER(7.20),       "7.20  PAL SAT FM-stereo s"   },
	{ MSP_CARRIER(7.38),       "7.38  PAL SAT FM-stereo b"   },
};

#define CARRIER_COUNT(x) (sizeof(x)/sizeof(struct CARRIER_DETECT))

/* ----------------------------------------------------------------------- */

#define SCART_MASK    0
#define SCART_IN1     1
#define SCART_IN2     2
#define SCART_IN1_DA  3
#define SCART_IN2_DA  4
#define SCART_IN3     5
#define SCART_IN4     6
#define SCART_MONO    7
#define SCART_MUTE    8

static int scarts[3][9] = {
  /* MASK    IN1     IN2     IN1_DA  IN2_DA  IN3     IN4     MONO    MUTE   */
  {  0x0320, 0x0000, 0x0200, -1,     -1,     0x0300, 0x0020, 0x0100, 0x0320 },
  {  0x0c40, 0x0440, 0x0400, 0x0c00, 0x0040, 0x0000, 0x0840, 0x0800, 0x0c40 },
  {  0x3080, 0x1000, 0x1080, 0x0000, 0x0080, 0x2080, 0x3080, 0x2000, 0x3000 },
};

static char *scart_names[] = {
  "mask", "in1", "in2", "in1 da", "in2 da", "in3", "in4", "mono", "mute"
};

static void
msp3400c_set_scart(struct i2c_client *client, int in, int out)
{
	struct msp3400c *msp = i2c_get_clientdata(client);

	if (-1 == scarts[out][in])
		return;

	dprintk(KERN_DEBUG
		"msp34xx: scart switch: %s => %d\n",scart_names[in],out);
	msp->acb &= ~scarts[out][SCART_MASK];
	msp->acb |=  scarts[out][in];
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0013, msp->acb);
}

/* ------------------------------------------------------------------------ */

static void msp3400c_setcarrier(struct i2c_client *client, int cdo1, int cdo2)
{
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0093, cdo1 & 0xfff);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x009b, cdo1 >> 12);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x00a3, cdo2 & 0xfff);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x00ab, cdo2 >> 12);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0056, 0); /*LOAD_REG_1/2*/
}

static void msp3400c_setvolume(struct i2c_client *client,
			       int muted, int left, int right)
{
	int vol = 0,val = 0,balance = 0;

	if (!muted) {
		vol     = (left > right) ? left : right;
		val     = (vol * 0x73 / 65535) << 8;
	}
	if (vol > 0) {
		balance = ((right-left) * 127) / vol;
	}

	dprintk(KERN_DEBUG
		"msp34xx: setvolume: mute=%s %d:%d  v=0x%02x b=0x%02x\n",
		muted ? "on" : "off", left, right, val>>8, balance);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0000, val); /* loudspeaker */
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0006, val); /* headphones  */
	/* scart - on/off only */
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0007, val ? 0x4000 : 0);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0001, balance << 8);
}

static void msp3400c_setbass(struct i2c_client *client, int bass)
{
	int val = ((bass-32768) * 0x60 / 65535) << 8;

	dprintk(KERN_DEBUG "msp34xx: setbass: %d 0x%02x\n",bass, val>>8);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0002, val); /* loudspeaker */