ov511.c

EVC 写的 wince usb camera 代码

			if (rc < 0)
				return rc;
		}

		reg++;
	}

	return 0;
}

static int
ov51x_reset(struct usb_ov511 *ov, unsigned char reset_type)
{
	int rc;

	/* Setting bit 0 not allowed on 518/518Plus */
	if (ov->bclass == BCL_OV518)
		reset_type &= 0xfe;

	PDEBUG(4, "Reset: type=0x%02X", reset_type);

	rc = reg_w(ov, R51x_SYS_RESET, reset_type);
	rc = reg_w(ov, R51x_SYS_RESET, 0);

	if (rc < 0)
		err("reset: command failed");

	return rc;
}

/**********************************************************************
 *
 * Low-level I2C I/O functions
 *
 **********************************************************************/

/* NOTE: Do not call this function directly!
 * The OV518 I2C I/O procedure is different, hence, this function.
 * This is normally only called from i2c_w(). Note that this function
 * always succeeds regardless of whether the sensor is present and working.
 */
static int
ov518_i2c_write_internal(struct usb_ov511 *ov,
			 unsigned char reg,
			 unsigned char value)
{
	int rc;

	PDEBUG(5, "0x%02X:0x%02X", reg, value);

	/* Select camera register */
	rc = reg_w(ov, R51x_I2C_SADDR_3, reg);
	if (rc < 0)
		return rc;

	/* Write "value" to I2C data port of OV511 */
	rc = reg_w(ov, R51x_I2C_DATA, value);
	if (rc < 0)
		return rc;

	/* Initiate 3-byte write cycle */
	rc = reg_w(ov, R518_I2C_CTL, 0x01);
	if (rc < 0)
		return rc;

	return 0;
}

/* NOTE: Do not call this function directly! */
static int
ov511_i2c_write_internal(struct usb_ov511 *ov,
			 unsigned char reg,
			 unsigned char value)
{
	int rc, retries;

	PDEBUG(5, "0x%02X:0x%02X", reg, value);

	/* Three byte write cycle */
	for (retries = OV511_I2C_RETRIES; ; ) {
		/* Select camera register */
		rc = reg_w(ov, R51x_I2C_SADDR_3, reg);
		if (rc < 0)
			break;

		/* Write "value" to I2C data port of OV511 */
		rc = reg_w(ov, R51x_I2C_DATA, value);
		if (rc < 0)
			break;

		/* Initiate 3-byte write cycle */
		rc = reg_w(ov, R511_I2C_CTL, 0x01);
		if (rc < 0)
			break;

		/* Retry until idle */
		do
			rc = reg_r(ov, R511_I2C_CTL);
		while (rc > 0 && ((rc&1) == 0)); 
		if (rc < 0)
			break;

		/* Ack? */
		if ((rc&2) == 0) {
			rc = 0;
			break;
		}
#if 0
		/* I2C abort */
		reg_w(ov, R511_I2C_CTL, 0x10);
#endif
		if (--retries < 0) {
			err("i2c write retries exhausted");
			rc = -1;
			break;
		}
	}

	return rc;
}

/* NOTE: Do not call this function directly!
 * The OV518 I2C I/O procedure is different, hence, this function.
 * This is normally only called from i2c_r(). Note that this function
 * always succeeds regardless of whether the sensor is present and working.
 */
static int
ov518_i2c_read_internal(struct usb_ov511 *ov, unsigned char reg)
{
	int rc, value;

	/* Select camera register */
	rc = reg_w(ov, R51x_I2C_SADDR_2, reg);
	if (rc < 0)
		return rc;

	/* Initiate 2-byte write cycle */
	rc = reg_w(ov, R518_I2C_CTL, 0x03);
	if (rc < 0)
		return rc;

	/* Initiate 2-byte read cycle */
	rc = reg_w(ov, R518_I2C_CTL, 0x05);
	if (rc < 0)
		return rc;

	value = reg_r(ov, R51x_I2C_DATA);

	PDEBUG(5, "0x%02X:0x%02X", reg, value);

	return value;
}

/* NOTE: Do not call this function directly!
 * returns: negative is error, pos or zero is data */
static int
ov511_i2c_read_internal(struct usb_ov511 *ov, unsigned char reg)
{
	int rc, value, retries;

	/* Two byte write cycle */
	for (retries = OV511_I2C_RETRIES; ; ) {
		/* Select camera register */
		rc = reg_w(ov, R51x_I2C_SADDR_2, reg);
		if (rc < 0)
			return rc;

		/* Initiate 2-byte write cycle */
		rc = reg_w(ov, R511_I2C_CTL, 0x03);
		if (rc < 0)
			return rc;

		/* Retry until idle */
		do
			 rc = reg_r(ov, R511_I2C_CTL);
		while (rc > 0 && ((rc&1) == 0));
		if (rc < 0)
			return rc;

		if ((rc&2) == 0) /* Ack? */
			break;

		/* I2C abort */
		reg_w(ov, R511_I2C_CTL, 0x10);

		if (--retries < 0) {
			err("i2c write retries exhausted");
			return -1;
		}
	}

	/* Two byte read cycle */
	for (retries = OV511_I2C_RETRIES; ; ) {
		/* Initiate 2-byte read cycle */
		rc = reg_w(ov, R511_I2C_CTL, 0x05);
		if (rc < 0)
			return rc;

		/* Retry until idle */
		do
			rc = reg_r(ov, R511_I2C_CTL);
		while (rc > 0 && ((rc&1) == 0));
		if (rc < 0)
			return rc;

		if ((rc&2) == 0) /* Ack? */
			break;

		/* I2C abort */
		rc = reg_w(ov, R511_I2C_CTL, 0x10);
		if (rc < 0)
			return rc;

		if (--retries < 0) {
			err("i2c read retries exhausted");
			return -1;
		}
	}

	value = reg_r(ov, R51x_I2C_DATA);

	PDEBUG(5, "0x%02X:0x%02X", reg, value);

	/* This is needed to make i2c_w() work */
	rc = reg_w(ov, R511_I2C_CTL, 0x05);
	if (rc < 0)
		return rc;

	return value;
}

/* returns: negative is error, pos or zero is data */
static int
i2c_r(struct usb_ov511 *ov, unsigned char reg)
{
	int rc;

	down(&ov->i2c_lock);

	if (ov->bclass == BCL_OV518)
		rc = ov518_i2c_read_internal(ov, reg);
	else
		rc = ov511_i2c_read_internal(ov, reg);

	up(&ov->i2c_lock);

	return rc;
}

static int
i2c_w(struct usb_ov511 *ov, unsigned char reg, unsigned char value)
{
	int rc;

	down(&ov->i2c_lock);

	if (ov->bclass == BCL_OV518)
		rc = ov518_i2c_write_internal(ov, reg, value);
	else
		rc = ov511_i2c_write_internal(ov, reg, value);

	up(&ov->i2c_lock);

	return rc;
}

/* Do not call this function directly! */
static int
ov51x_i2c_write_mask_internal(struct usb_ov511 *ov,
			      unsigned char reg,
			      unsigned char value,
			      unsigned char mask)
{
	int rc;
	unsigned char oldval, newval;

	if (mask == 0xff) {
		newval = value;
	} else {
		if (ov->bclass == BCL_OV518)
			rc = ov518_i2c_read_internal(ov, reg);
		else
			rc = ov511_i2c_read_internal(ov, reg);
		if (rc < 0)
			return rc;

		oldval = (unsigned char) rc;
		oldval &= (~mask);		/* Clear the masked bits */
		value &= mask;			/* Enforce mask on value */
		newval = oldval | value;	/* Set the desired bits */
	}

	if (ov->bclass == BCL_OV518)
		return (ov518_i2c_write_internal(ov, reg, newval));
	else
		return (ov511_i2c_write_internal(ov, reg, newval));
}

/* Writes bits at positions specified by mask to an I2C reg. Bits that are in
 * the same position as 1's in "mask" are cleared and set to "value". Bits
 * that are in the same position as 0's in "mask" are preserved, regardless
 * of their respective state in "value".
 */
static int
i2c_w_mask(struct usb_ov511 *ov,
	   unsigned char reg,
	   unsigned char value,
	   unsigned char mask)
{
	int rc;

	down(&ov->i2c_lock);
	rc = ov51x_i2c_write_mask_internal(ov, reg, value, mask);
	up(&ov->i2c_lock);

	return rc;
}

/* Set the read and write slave IDs. The "slave" argument is the write slave,
 * and the read slave will be set to (slave + 1). ov->i2c_lock should be held
 * when calling this. This should not be called from outside the i2c I/O
 * functions.
 */
static int
i2c_set_slave_internal(struct usb_ov511 *ov, unsigned char slave)
{
	int rc;

	rc = reg_w(ov, R51x_I2C_W_SID, slave);
	if (rc < 0)
		return rc;

	rc = reg_w(ov, R51x_I2C_R_SID, slave + 1);
	if (rc < 0)
		return rc;

	return 0;
}

/* Write to a specific I2C slave ID and register, using the specified mask */
static int
i2c_w_slave(struct usb_ov511 *ov,
	    unsigned char slave,
	    unsigned char reg,
	    unsigned char value,
	    unsigned char mask)
{
	int rc = 0;

	down(&ov->i2c_lock);

	/* Set new slave IDs */
	rc = i2c_set_slave_internal(ov, slave);
	if (rc < 0)
		goto out;

	rc = ov51x_i2c_write_mask_internal(ov, reg, value, mask);

out:
	/* Restore primary IDs */
	if (i2c_set_slave_internal(ov, ov->primary_i2c_slave) < 0)
		err("Couldn't restore primary I2C slave");

	up(&ov->i2c_lock);
	return rc;
}

/* Read from a specific I2C slave ID and register */
static int
i2c_r_slave(struct usb_ov511 *ov,
	    unsigned char slave,
	    unsigned char reg)
{
	int rc;

	down(&ov->i2c_lock);

	/* Set new slave IDs */
	rc = i2c_set_slave_internal(ov, slave);
	if (rc < 0)
		goto out;

	if (ov->bclass == BCL_OV518)
		rc = ov518_i2c_read_internal(ov, reg);
	else
		rc = ov511_i2c_read_internal(ov, reg);

out:
	/* Restore primary IDs */
	if (i2c_set_slave_internal(ov, ov->primary_i2c_slave) < 0)
		err("Couldn't restore primary I2C slave");

	up(&ov->i2c_lock);
	return rc;
}

/* Sets I2C read and write slave IDs. Returns <0 for error */
static int
ov51x_set_slave_ids(struct usb_ov511 *ov, unsigned char sid)
{
	int rc;

	down(&ov->i2c_lock);

	rc = i2c_set_slave_internal(ov, sid);
	if (rc < 0)
		goto out;

	// FIXME: Is this actually necessary?
	rc = ov51x_reset(ov, OV511_RESET_NOREGS);
out:
	up(&ov->i2c_lock);
	return rc;
}

static int
write_regvals(struct usb_ov511 *ov, struct ov511_regvals * pRegvals)
{
	int rc;

	while (pRegvals->bus != OV511_DONE_BUS) {
		if (pRegvals->bus == OV511_REG_BUS) {
			if ((rc = reg_w(ov, pRegvals->reg, pRegvals->val)) < 0)
				return rc;
		} else if (pRegvals->bus == OV511_I2C_BUS) {
			if ((rc = i2c_w(ov, pRegvals->reg, pRegvals->val)) < 0)
				return rc;
		} else {
			err("Bad regval array");
			return -1;
		}
		pRegvals++;
	}
	return 0;
}

#ifdef OV511_DEBUG
static void
dump_i2c_range(struct usb_ov511 *ov, int reg1, int regn)
{
	int i, rc;

	for (i = reg1; i <= regn; i++) {
		rc = i2c_r(ov, i);
		info("Sensor[0x%02X] = 0x%02X", i, rc);
	}
}

static void
dump_i2c_regs(struct usb_ov511 *ov)
{
	info("I2C REGS");
	dump_i2c_range(ov, 0x00, 0x7C);
}

static void
dump_reg_range(struct usb_ov511 *ov, int reg1, int regn)
{
	int i, rc;

	for (i = reg1; i <= regn; i++) {
		rc = reg_r(ov, i);
		info("OV511[0x%02X] = 0x%02X", i, rc);
	}
}

static void
ov511_dump_regs(struct usb_ov511 *ov)
{
	info("CAMERA INTERFACE REGS");
	dump_reg_range(ov, 0x10, 0x1f);
	info("DRAM INTERFACE REGS");
	dump_reg_range(ov, 0x20, 0x23);
	info("ISO FIFO REGS");
	dump_reg_range(ov, 0x30, 0x31);
	info("PIO REGS");
	dump_reg_range(ov, 0x38, 0x39);
	dump_reg_range(ov, 0x3e, 0x3e);
	info("I2C REGS");
	dump_reg_range(ov, 0x40, 0x49);
	info("SYSTEM CONTROL REGS");
	dump_reg_range(ov, 0x50, 0x55);
	dump_reg_range(ov, 0x5e, 0x5f);
	info("OmniCE REGS");
	dump_reg_range(ov, 0x70, 0x79);
	/* NOTE: Quantization tables are not readable. You will get the value
	 * in reg. 0x79 for every table register */
	dump_reg_range(ov, 0x80, 0x9f);
	dump_reg_range(ov, 0xa0, 0xbf);

}

static void
ov518_dump_regs(struct usb_ov511 *ov)
{
	info("VIDEO MODE REGS");
	dump_reg_range(ov, 0x20, 0x2f);
	info("DATA PUMP AND SNAPSHOT REGS");
	dump_reg_range(ov, 0x30, 0x3f);
	info("I2C REGS");
	dump_reg_range(ov, 0x40, 0x4f);
	info("SYSTEM CONTROL AND VENDOR REGS");
	dump_reg_range(ov, 0x50, 0x5f);
	info("60 - 6F");
	dump_reg_range(ov, 0x60, 0x6f);
	info("70 - 7F");
	dump_reg_range(ov, 0x70, 0x7f);
	info("Y QUANTIZATION TABLE");
	dump_reg_range(ov, 0x80, 0x8f);
	info("UV QUANTIZATION TABLE");
	dump_reg_range(ov, 0x90, 0x9f);
	info("A0 - BF");
	dump_reg_range(ov, 0xa0, 0xbf);
	info("CBR");
	dump_reg_range(ov, 0xc0, 0xcf);
}
#endif

/*****************************************************************************/

/* Temporarily stops OV511 from functioning. Must do this before changing
 * registers while the camera is streaming */
static inline int
ov51x_stop(struct usb_ov511 *ov)
{
	PDEBUG(4, "stopping");
	ov->stopped = 1;
	if (ov->bclass == BCL_OV518)
		return (reg_w_mask(ov, R51x_SYS_RESET, 0x3a, 0x3a));
	else
		return (reg_w(ov, R51x_SYS_RESET, 0x3d));
}

/* Restarts OV511 after ov511_stop() is called. Has no effect if it is not
 * actually stopped (for performance). */
static inline int
ov51x_restart(struct usb_ov511 *ov)
{
	if (ov->stopped) {
		PDEBUG(4, "restarting");
		ov->stopped = 0;

		/* Reinitialize the stream */
		if (ov->bclass == BCL_OV518)
			reg_w(ov, 0x2f, 0x80);

		return (reg_w(ov, R51x_SYS_RESET, 0x00));
	}

	return 0;
}

/* Sleeps until no frames are active. Returns !0 if got signal */
static int
ov51x_wait_frames_inactive(struct usb_ov511 *ov)
{
	return wait_event_interruptible(ov->wq, ov->curframe < 0);
}