V4L/DVB (6676): Improve s-code support

s-code tables are related to IF frequency used for video demodulation.

The s-codes for analog are automatically loaded, according with video standard.
However, for digital, they will depend on the IF of the demoduler chip. IF of
the demoduler.

Before this patch, only a few IF's where possible to use. This patch allows
selecting any IF defined at firmware file.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/tuner-xc2028-types.h

···
 #define INPUT2         (1 << 28)
 #define SCODE          (1 << 29)
 
+/* This flag identifies that the scode table has a new format */
+#define HAS_IF         (1 << 30)
+
 #define SCODE_TYPES	(MTS|DTV6|QAM|DTV7|DTV78|DTV8|LCD|NOGD|MONO|ATSC|IF| \
 			 LG60|ATI638|OREN538|OREN36|TOYOTA388|TOYOTA794|     \
 			 DIBCOM52|ZARLINK456|CHINA|F6MHZ|SCODE)

drivers/media/video/tuner-xc2028.c

···
 struct firmware_description {
 	unsigned int  type;
 	v4l2_std_id   id;
+	__u16         int_freq;
 	unsigned char *ptr;
 	unsigned int  size;
 };
···
 	unsigned int	type;
 	v4l2_std_id	id;
 	v4l2_std_id	std_req;
+	__u16		int_freq;
 	unsigned int	scode_table;
 	int 		scode_nr;
 };
···
 	while (p < endp) {
 		__u32 type, size;
 		v4l2_std_id id;
+		__u16 int_freq = 0;
 
 		n++;
 		if (n >= n_array) {
···
 
 		id = le64_to_cpu(*(v4l2_std_id *) p);
 		p += sizeof(id);
+
+		if (type & HAS_IF) {
+			int_freq = le16_to_cpu(*(__u16 *) p);
+			p += sizeof(int_freq);
+		}
 
 		size = le32_to_cpu(*(__u32 *) p);
 		p += sizeof(size);
···
 		priv->firm[n].type = type;
 		priv->firm[n].id   = id;
 		priv->firm[n].size = size;
+		priv->firm[n].int_freq = int_freq;
 
 		p += size;
 	}
···
 }
 
 static int load_scode(struct dvb_frontend *fe, unsigned int type,
-			 v4l2_std_id *id, int scode)
+			 v4l2_std_id *id, __u16 int_freq, int scode)
 {
 	struct xc2028_data *priv = fe->tuner_priv;
 	int                pos, rc;
···
 
 	tuner_dbg("%s called\n", __FUNCTION__);
 
-	pos = seek_firmware(fe, type, id);
-	if (pos < 0)
-		return pos;
+	if (!int_freq) {
+		pos = seek_firmware(fe, type, id);
+		if (pos < 0)
+			return pos;
+	} else {
+		for (pos = 0; pos < priv->firm_size; pos++) {
+			if ((priv->firm[pos].int_freq == int_freq) &&
+			    (type & HAS_IF))
+				break;
+		}
+		if (pos == priv->firm_size)
+			return -ENOENT;
+	}
 
 	p = priv->firm[pos].ptr;
 
-	/* 16 SCODE entries per file; each SCODE entry is 12 bytes and
-	 * has a 2-byte size header in the firmware format. */
-	if (priv->firm[pos].size != 14 * 16 || scode >= 16 ||
-	    le16_to_cpu(*(__u16 *)(p + 14 * scode)) != 12)
-		return -EINVAL;
+	if (type & HAS_IF) {
+		if (priv->firm[pos].size != 12 * 16 || scode >= 16)
+			return -EINVAL;
+		p += 12 * scode;
+	} else {
+		/* 16 SCODE entries per file; each SCODE entry is 12 bytes and
+		 * has a 2-byte size header in the firmware format. */
+		if (priv->firm[pos].size != 14 * 16 || scode >= 16 ||
+		    le16_to_cpu(*(__u16 *)(p + 14 * scode)) != 12)
+			return -EINVAL;
+		p += 14 * scode + 2;
+	}
 
 	tuner_info("Loading SCODE for type=");
 	dump_firm_type(priv->firm[pos].type);
···
 	if (rc < 0)
 		return -EIO;
 
-	rc = i2c_send(priv, p + 14 * scode + 2, 12);
+	rc = i2c_send(priv, p, 12);
 	if (rc < 0)
 		return -EIO;
 
···
 }
 
 static int check_firmware(struct dvb_frontend *fe, unsigned int type,
-			  v4l2_std_id std)
+			  v4l2_std_id std, __u16 int_freq)
 {
 	struct xc2028_data         *priv = fe->tuner_priv;
 	struct firmware_properties new_fw;
···
 	new_fw.std_req = std;
 	new_fw.scode_table = SCODE | priv->ctrl.scode_table;
 	new_fw.scode_nr = 0;
+	new_fw.int_freq = int_freq;
 
 	tuner_dbg("checking firmware, user requested type=");
 	if (debug) {
···
 	/* Load SCODE firmware, if exists */
 	tuner_dbg("Trying to load scode %d\n", new_fw.scode_nr);
 
-	rc = load_scode(fe, new_fw.type | new_fw.scode_table,
-			&new_fw.id, new_fw.scode_nr);
+	rc = load_scode(fe, new_fw.type | new_fw.scode_table, &new_fw.id,
+			new_fw.int_freq, new_fw.scode_nr);
 
 check_device:
 	if (xc2028_get_reg(priv, 0x0004, &version) < 0 ||
···
 #define DIV 15625
 
 static int generic_set_freq(struct dvb_frontend *fe, u32 freq /* in HZ */,
-			       enum tuner_mode new_mode,
-			       unsigned int type,
-			       v4l2_std_id std)
+			    enum tuner_mode new_mode,
+			    unsigned int type,
+			    v4l2_std_id std,
+			    u16 int_freq)
 {
 	struct xc2028_data *priv = fe->tuner_priv;
 	int		   rc = -EINVAL;
···
 
 	tuner_dbg("should set frequency %d kHz\n", freq / 1000);
 
-	if (check_firmware(fe, type, std) < 0)
+	if (check_firmware(fe, type, std, int_freq) < 0)
 		goto ret;
 
 	/* On some cases xc2028 can disable video output, if
···
 		if (priv->ctrl.input1)
 			type |= INPUT1;
 		return generic_set_freq(fe, (625l * p->frequency) / 10,
-				T_ANALOG_TV, type, 0);
+				T_ANALOG_TV, type, 0, 0);
 	}
 
 	/* if std is not defined, choose one */
···
 	p->std |= parse_audio_std_option();
 
 	return generic_set_freq(fe, 62500l * p->frequency,
-				T_ANALOG_TV, type, p->std);
+				T_ANALOG_TV, type, p->std, 0);
 }
-
-static unsigned int demod_type [] = {
-	[XC3028_FE_DEFAULT]	= 0,
-	[XC3028_FE_LG60]	= LG60,
-	[XC3028_FE_ATI638]	= ATI638,
-	[XC3028_FE_OREN538]	= OREN538,
-	[XC3028_FE_OREN36]	= OREN36,
-	[XC3028_FE_TOYOTA388]	= TOYOTA388,
-	[XC3028_FE_TOYOTA794]	= TOYOTA794,
-	[XC3028_FE_DIBCOM52]	= DIBCOM52,
-	[XC3028_FE_ZARLINK456]	= ZARLINK456,
-	[XC3028_FE_CHINA]	= CHINA,
-};
 
 static int xc2028_set_params(struct dvb_frontend *fe,
 			     struct dvb_frontend_parameters *p)
···
 		tuner_err("error: bandwidth not supported.\n");
 	};
 
-	if (priv->ctrl.demod < 0 || priv->ctrl.demod > ARRAY_SIZE(demod_type))
-		tuner_err("error: demod type invalid. Assuming default.\n");
-	else
-		type |= demod_type[priv->ctrl.demod];
+	/* All S-code tables need a 200kHz shift */
+	if (priv->ctrl.demod)
+		priv->ctrl.demod += 200;
 
 	return generic_set_freq(fe, p->frequency,
-				T_DIGITAL_TV, type, 0);
+				T_DIGITAL_TV, type, 0, priv->ctrl.demod);
 }
 
 static int xc2028_sleep(struct dvb_frontend *fe)

drivers/media/video/tuner-xc2028.h

···
 
 #define XC2028_DEFAULT_FIRMWARE "xc3028-v27.fw"
 
-enum xc2028_demod_types
-{
-	XC3028_FE_DEFAULT = 0,
-	XC3028_FE_LG60,		/* IF = 6.00 MHz */
-	XC3028_FE_ATI638,	/* IF = 6.38 MHz */
-	XC3028_FE_OREN538,	/* IF = 5.38 MHz */
-	XC3028_FE_OREN36,	/* IF = 3.60 MHz */
-	XC3028_FE_TOYOTA388,	/* IF = 3.88 MHz */
-	XC3028_FE_TOYOTA794,	/* IF = 7.94 MHz */
-	XC3028_FE_DIBCOM52,	/* IF = 5.20 MHz */
-	XC3028_FE_ZARLINK456,	/* IF = 4.56 MHz */
-	XC3028_FE_CHINA,	/* IF = 5.20 MHz */
-};
+/*      Dmoduler		IF (kHz) */
+#define	XC3028_FE_DEFAULT	0
+#define XC3028_FE_LG60		6000
+#define	XC3028_FE_ATI638	6380
+#define	XC3028_FE_OREN538	5380
+#define	XC3028_FE_OREN36	3600
+#define	XC3028_FE_TOYOTA388	3880
+#define	XC3028_FE_TOYOTA794	7940
+#define	XC3028_FE_DIBCOM52	5200
+#define	XC3028_FE_ZARLINK456	4560
+#define	XC3028_FE_CHINA		5200
 
 struct xc2028_ctrl {
 	char			*fname;
···
 	unsigned int		mts   :1;
 	unsigned int		d2633 :1;
 	unsigned int		input1:1;
-	enum xc2028_demod_types demod;
+	unsigned int		demod;
 };
 
 struct xc2028_config {