V4L/DVB (6646): xc2028: rework firmware (re)loading process

Define a list of valid "firmware types" for each combination of BASE,
DTV and SCODEs.  By masking the appropriate firmware bits off we can
just use one "type" for the firmware searching and also flag when we
are looking for a BASE, DTV or SCODE type firmware.  This makes it
much easier to track if we need to change device modes or flash an
individual firmware part.

Add a structure to remember what firmware properties we have.  This
contains the currently loaded/wanted  base firmware (type), video std
(id), video std requested (std_req), scode file and number in use.

Incorporate said structure into the tuner private data.

When checking whether the current firmware needs to be reloaded, first
figure out exactly what "type" of firmware we want (base, std and
scode), and then proceed to load the appropriate matching base,
std-specific and scode records iff there are any changes required.
This removes guesswork from the process because we no longer need to
individually code a check for every tuning parameter's interactions.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

3 files changed, 124 insertions, 97 deletions

diff --git a/drivers/media/video/tuner-xc2028-types.h b/drivers/media/video/tuner-xc2028-types.h
index a9e2e05..6cee481 100644
--- a/drivers/media/video/tuner-xc2028-types.h
+++ b/drivers/media/video/tuner-xc2028-types.h
@@ -8,6 +8,7 @@
 
 /* BASE firmware should be loaded before any other firmware */
 #define BASE		(1<<0)
+#define BASE_TYPES	(BASE|F8MHZ|MTS|FM|INPUT1|INPUT2|INIT1)
 
 /* F8MHZ marks BASE firmwares for 8 MHz Bandwidth */
 #define F8MHZ		(1<<1)
@@ -37,6 +38,8 @@
 #define DTV78		(1<<8)
 #define DTV8		(1<<9)
 
+#define DTV_TYPES	(D2620|D2633|DTV6|QAM|DTV7|DTV78|DTV8|ATSC)
+
 /* There's a FM | BASE firmware + FM specific firmware (std=0) */
 #define	FM		(1<<10)
 
@@ -60,6 +63,7 @@
 /* Old firmwares were broken into init0 and init1 */
 #define INIT1		(1<<14)
 
+/* SCODE firmware selects particular behaviours */
 #define MONO           (1 << 15)
 #define ATSC           (1 << 16)
 #define IF             (1 << 17)
@@ -76,6 +80,10 @@
 #define INPUT2         (1 << 28)
 #define SCODE          (1 << 29)
 
+#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)
+
 /* Newer types to be moved to videodev2.h */
 
 #define V4L2_STD_SECAM_K3	(0x04000000)
diff --git a/drivers/media/video/tuner-xc2028.c b/drivers/media/video/tuner-xc2028.c
index a5efd5f..8140d8a 100644
--- a/drivers/media/video/tuner-xc2028.c
+++ b/drivers/media/video/tuner-xc2028.c
@@ -54,6 +54,14 @@ struct firmware_description {
 	unsigned int  size;
 };
 
+struct firmware_properties {
+	unsigned int	type;
+	v4l2_std_id	id;
+	v4l2_std_id	std_req;
+	unsigned int	scode_table;
+	int 		scode_nr;
+};
+
 struct xc2028_data {
 	struct list_head        xc2028_list;
 	struct tuner_i2c_props  i2c_props;
@@ -69,14 +77,7 @@ struct xc2028_data {
 
 	struct xc2028_ctrl	ctrl;
 
-	v4l2_std_id		firm_type;	   /* video stds supported
-							by current firmware */
-	fe_bandwidth_t		bandwidth;	   /* Firmware bandwidth:
-							      6M, 7M or 8M */
-	int			need_load_generic; /* The generic firmware
-							      were loaded? */
-	enum tuner_mode	mode;
-	struct i2c_client	*i2c_client;
+	struct firmware_properties cur_fw;
 
 	struct mutex lock;
 };
@@ -234,7 +235,8 @@ static void free_firmware(struct xc2028_data *priv)
 
 	priv->firm = NULL;
 	priv->firm_size = 0;
-	priv->need_load_generic = 1;
+
+	memset(&priv->cur_fw, 0, sizeof(priv->cur_fw));
 }
 
 static int load_all_firmwares(struct dvb_frontend *fe)
@@ -393,6 +395,13 @@ static int seek_firmware(struct dvb_frontend *fe, unsigned int type,
 	if (((type & ~SCODE) == 0) && (*id == 0))
 		*id = V4L2_STD_PAL;
 
+	if (type & BASE)
+		type &= BASE_TYPES;
+	else if (type & SCODE)
+		type &= SCODE_TYPES;
+	else if (type & DTV_TYPES)
+		type = type & DTV_TYPES;
+
 	/* Seek for exact match */
 	for (i = 0; i < priv->firm_size; i++) {
 		if ((type == priv->firm[i].type) && (*id == priv->firm[i].id))
@@ -598,11 +607,10 @@ static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode,
 			  v4l2_std_id std, fe_bandwidth_t bandwidth)
 {
 	struct xc2028_data      *priv = fe->tuner_priv;
-	int			rc;
+	int			rc = 0;
+	unsigned int		type = 0;
+	struct firmware_properties new_fw;
 	u16			version, hwmodel;
-	v4l2_std_id		std0 = 0;
-	unsigned int		type0 = 0, type = 0;
-	int			change_digital_bandwidth;
 
 	tuner_dbg("%s called\n", __FUNCTION__);
 
@@ -617,61 +625,19 @@ static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode,
 			return rc;
 	}
 
-	tuner_dbg("I am in mode %u and I should switch to mode %i\n",
-		   priv->mode, new_mode);
-
-	/* first of all, determine whether we have switched the mode */
-	if (new_mode != priv->mode) {
-		priv->mode = new_mode;
-		priv->need_load_generic = 1;
-	}
-
-	change_digital_bandwidth = (priv->mode == T_DIGITAL_TV
-				    && bandwidth != priv->bandwidth) ? 1 : 0;
-	tuner_dbg("old bandwidth %u, new bandwidth %u\n", priv->bandwidth,
-		   bandwidth);
-
-	if (priv->need_load_generic) {
-		/* Reset is needed before loading firmware */
-		rc = priv->tuner_callback(priv->video_dev,
-					  XC2028_TUNER_RESET, 0);
-		if (rc < 0)
-			return rc;
-
-		type0 = BASE;
-
-		if (priv->ctrl.type == XC2028_FIRM_MTS)
-			type0 |= MTS;
-
-		if (bandwidth == BANDWIDTH_7_MHZ ||
-		    bandwidth == BANDWIDTH_8_MHZ)
-			type0 |= F8MHZ;
-
-		/* FIXME: How to load FM and FM|INPUT1 firmwares? */
-
-		rc = load_firmware(fe, type0, &std0);
-		if (rc < 0) {
-			tuner_err("Error %d while loading generic firmware\n",
-				  rc);
-			return rc;
-		}
-
-		priv->need_load_generic = 0;
-		priv->firm_type = 0;
-		if (priv->mode == T_DIGITAL_TV)
-			change_digital_bandwidth = 1;
-	}
+	if (priv->ctrl.type == XC2028_FIRM_MTS)
+		type |= MTS;
+	if (bandwidth == BANDWIDTH_7_MHZ || bandwidth == BANDWIDTH_8_MHZ)
+		type |= F8MHZ;
 
-	tuner_dbg("I should change bandwidth %u\n", change_digital_bandwidth);
+	/* FIXME: How to load FM and FM|INPUT1 firmwares? */
 
-	if (change_digital_bandwidth) {
+	if (new_mode == T_DIGITAL_TV) {
 		if (priv->ctrl.d2633)
 			type |= D2633;
 		else
 			type |= D2620;
 
-		/* FIXME: When should select a DTV78 firmware?
-		 */
 		switch (bandwidth) {
 		case BANDWIDTH_8_MHZ:
 			type |= DTV8;
@@ -683,49 +649,96 @@ static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode,
 			/* FIXME: Should allow select also ATSC */
 			type |= DTV6 | QAM;
 			break;
-
 		default:
 			tuner_err("error: bandwidth not supported.\n");
 		};
-		priv->bandwidth = bandwidth;
 	}
 
-	if (!change_digital_bandwidth && priv->mode == T_DIGITAL_TV)
-		return 0;
+	new_fw.type = type;
+	new_fw.id = std;
+	new_fw.std_req = std;
+	new_fw.scode_table = SCODE | priv->ctrl.scode_table;
+	new_fw.scode_nr = 0;
+
+	tuner_dbg("checking firmware, user requested type=");
+	if (debug) {
+		dump_firm_type(new_fw.type);
+		printk("(%x), id %016llx, scode_tbl ", new_fw.type,
+		       (unsigned long long)new_fw.std_req);
+		dump_firm_type(priv->ctrl.scode_table);
+		printk("(%x), scode_nr %d\n", priv->ctrl.scode_table,
+		       new_fw.scode_nr);
+	}
+
+	/* No need to reload base firmware if it matches */
+	if (((BASE | new_fw.type) & BASE_TYPES) ==
+	    (priv->cur_fw.type & BASE_TYPES)) {
+		tuner_dbg("BASE firmware not changed.\n");
+		goto skip_base;
+	}
+
+	/* Updating BASE - forget about all currently loaded firmware */
+	memset(&priv->cur_fw, 0, sizeof(priv->cur_fw));
+
+	/* Reset is needed before loading firmware */
+	rc = priv->tuner_callback(priv->video_dev,
+				  XC2028_TUNER_RESET, 0);
+	if (rc < 0)
+		goto fail;
+
+	rc = load_firmware(fe, BASE | new_fw.type, &new_fw.id);
+	if (rc < 0) {
+		tuner_err("Error %d while loading base firmware\n",
+			  rc);
+		goto fail;
+	}
 
 	/* Load INIT1, if needed */
 	tuner_dbg("Load init1 firmware, if exists\n");
-	type0 = BASE | INIT1;
-	if (priv->ctrl.type == XC2028_FIRM_MTS)
-		type0 |= MTS;
 
-	/* FIXME: Should handle errors - if INIT1 found */
-	rc = load_firmware(fe, type0, &std0);
+	rc = load_firmware(fe, BASE | INIT1 | new_fw.type, &new_fw.id);
+	if (rc < 0 && rc != -ENOENT) {
+		tuner_err("Error %d while loading init1 firmware\n",
+			  rc);
+		goto fail;
+	}
 
-	/* FIXME: Should add support for FM radio
+skip_base:
+	/*
+	 * No need to reload standard specific firmware if base firmware
+	 * was not reloaded and requested video standards have not changed.
 	 */
-
-	if (priv->ctrl.type == XC2028_FIRM_MTS)
-		type |= MTS;
-
-	if (priv->firm_type & std) {
+	if (priv->cur_fw.type == (BASE | new_fw.type) &&
+	    priv->cur_fw.std_req == std) {
 		tuner_dbg("Std-specific firmware already loaded.\n");
-		return 0;
+		goto skip_std_specific;
 	}
 
+	/* Reloading std-specific firmware forces a SCODE update */
+	priv->cur_fw.scode_table = 0;
+
 	/* Add audio hack to std mask */
-	std |= parse_audio_std_option();
+	if (new_mode == T_ANALOG_TV)
+		new_fw.id |= parse_audio_std_option();
 
-	rc = load_firmware(fe, type, &std);
+	rc = load_firmware(fe, new_fw.type, &new_fw.id);
 	if (rc < 0)
-		return rc;
+		goto fail;
+
+skip_std_specific:
+	if (priv->cur_fw.scode_table == new_fw.scode_table &&
+	    priv->cur_fw.scode_nr == new_fw.scode_nr) {
+		tuner_dbg("SCODE firmware already loaded.\n");
+		goto check_device;
+	}
 
 	/* Load SCODE firmware, if exists */
-	tuner_dbg("Trying to load scode 0\n");
-	type |= SCODE;
+	tuner_dbg("Trying to load scode %d\n", new_fw.scode_nr);
 
-	rc = load_scode(fe, type, &std, 0);
+	rc = load_scode(fe, new_fw.type | new_fw.scode_table,
+			&new_fw.id, new_fw.scode_nr);
 
+check_device:
 	xc2028_get_reg(priv, 0x0004, &version);
 	xc2028_get_reg(priv, 0x0008, &hwmodel);
 
@@ -734,9 +747,23 @@ static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode,
 		   hwmodel, (version & 0xf000) >> 12, (version & 0xf00) >> 8,
 		   (version & 0xf0) >> 4, version & 0xf);
 
-	priv->firm_type = std;
+	memcpy(&priv->cur_fw, &new_fw, sizeof(priv->cur_fw));
+
+	/*
+	 * By setting BASE in cur_fw.type only after successfully loading all
+	 * firmwares, we can:
+	 * 1. Identify that BASE firmware with type=0 has been loaded;
+	 * 2. Tell whether BASE firmware was just changed the next time through.
+	 */
+	priv->cur_fw.type |= BASE;
 
 	return 0;
+
+fail:
+	memset(&priv->cur_fw, 0, sizeof(priv->cur_fw));
+	if (rc == -ENOENT)
+		rc = -EINVAL;
+	return rc;
 }
 
 static int xc2028_signal(struct dvb_frontend *fe, u16 *strength)
@@ -785,16 +812,10 @@ static int generic_set_tv_freq(struct dvb_frontend *fe, u32 freq /* in Hz */ ,
 	mutex_lock(&priv->lock);
 
 	/* HACK: It seems that specific firmware need to be reloaded
-	   when freq is changed */
-
-	priv->firm_type = 0;
-
-	/* Reset GPIO 1 */
-	rc = priv->tuner_callback(priv->video_dev, XC2028_TUNER_RESET, 0);
-	if (rc < 0)
-		goto ret;
+	   when watching analog TV and freq is changed */
+	if (new_mode != T_DIGITAL_TV)
+		priv->cur_fw.type = 0;
 
-	msleep(10);
 	tuner_dbg("should set frequency %d kHz\n", freq / 1000);
 
 	if (check_firmware(fe, new_mode, std, bandwidth) < 0)
@@ -802,7 +823,7 @@ static int generic_set_tv_freq(struct dvb_frontend *fe, u32 freq /* in Hz */ ,
 
 	if (new_mode == T_DIGITAL_TV) {
 		offset = 2750000;
-		if (priv->bandwidth == BANDWIDTH_7_MHZ)
+		if (priv->cur_fw.type & DTV7)
 			offset -= 500000;
 	}
 
@@ -994,9 +1015,6 @@ void *xc2028_attach(struct dvb_frontend *fe, struct xc2028_config *cfg)
 			return NULL;
 		}
 
-		priv->bandwidth = BANDWIDTH_6_MHZ;
-		priv->need_load_generic = 1;
-		priv->mode = T_UNINITIALIZED;
 		priv->i2c_props.addr = cfg->i2c_addr;
 		priv->i2c_props.adap = cfg->i2c_adap;
 		priv->video_dev = video_dev;
diff --git a/drivers/media/video/tuner-xc2028.h b/drivers/media/video/tuner-xc2028.h
index 4edc4b7..16259b1 100644
--- a/drivers/media/video/tuner-xc2028.h
+++ b/drivers/media/video/tuner-xc2028.h
@@ -21,6 +21,7 @@ struct xc2028_ctrl {
 	char			*fname;
 	int			max_len;
 	int			d2633:1;
+	unsigned int		scode_table;
 };
 
 struct xc2028_config {