Use non-void configurations

This patch defines a ts_filter_configuration structure to
avoid using void* in the filter initialization, fixing another
upstream correction. This also makes the initialization more readable.

Tested in GTA02/rev6.

Other changes:

 ~ Comment filter configuration structures.
 ~ ts_filter.c:ts_filter_chain_create improved.
 ~ Small cleanups.
 ~ More TODOs/FIXMEs.
 ~ Updated GTA02 filter configuration.
 ~ Updated GTA01 filter configuration.
 ~ Updated mach-s3c2410/include/mach/ts.h for the new ts. configuration
   structure.
 ~ Updated all the filters to use the new configuration structure.
 ~ Removed MAX_TS_FILTER_CHAIN constant that is no longer needed.

No more evil casts left it seems.

Signed-off-by: Nelson Castillo <arhuaco@freaks-unidos.net>

2 files changed, 37 insertions, 46 deletions

diff --git a/arch/arm/mach-s3c2410/include/mach/ts.h b/arch/arm/mach-s3c2410/include/mach/ts.h
index 1b451ea1624..0600b306a34 100644
--- a/arch/arm/mach-s3c2410/include/mach/ts.h
+++ b/arch/arm/mach-s3c2410/include/mach/ts.h
@@ -19,17 +19,17 @@
 #include <../drivers/input/touchscreen/ts_filter.h>
 
 struct s3c2410_ts_mach_info {
-        int delay;
-        int presc;
-        /* array of pointers to filter APIs we want to use, in order
-         * ends on first NULL, all NULL is OK
-         */
-        struct ts_filter_api *filter_sequence[MAX_TS_FILTER_CHAIN];
-        /* array of configuration ints, one for each filter above */
-        void *filter_config[MAX_TS_FILTER_CHAIN];
+	/* Touchscreen delay. */
+	int delay;
+	/* Prescaler value. */
+	int presc;
+	/*
+	 * Null-terminated array of pointers to filter APIs and configurations
+	 * we want to use. In the same order they will be applied.
+	 */
+	struct ts_filter_configuration *filter_config;
 };
 
 void set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info);
 
 #endif /* __ASM_ARM_TS_H */
-
diff --git a/arch/arm/mach-s3c2410/mach-gta01.c b/arch/arm/mach-s3c2410/mach-gta01.c
index df76347a8f0..d40cd838ede 100644
--- a/arch/arm/mach-s3c2410/mach-gta01.c
+++ b/arch/arm/mach-s3c2410/mach-gta01.c
@@ -702,59 +702,50 @@ static struct s3c2410_udc_mach_info gta01_udc_cfg = {
 	.vbus_draw	= gta01_udc_vbus_draw,
 };
 
+/* Touchscreen configuration. */
 
-/* touchscreen configuration */
 #ifdef CONFIG_TOUCHSCREEN_FILTER
-static struct ts_filter_linear_configuration gta01_ts_linear_config = {
-	.constants = {1, 0, 0, 0, 1, 0, 1},	/* don't modify coords */
-	.coord0 = 0,
-	.coord1 = 1,
-};
-
-static struct ts_filter_group_configuration gta01_ts_group_config = {
-	.extent = 12,
+static struct ts_filter_group_configuration gta01_ts_group = {
+	.length = 12,
 	.close_enough = 10,
-	.threshold = 6,		/* at least half of the points in a group */
+	.threshold = 6,		/* At least half of the points in a group. */
 	.attempts = 10,
 };
 
-static struct ts_filter_median_configuration gta01_ts_median_config = {
-	.extent = 31,
-	.decimation_below = 24,
+static struct ts_filter_median_configuration gta01_ts_median = {
+	.extent = 20,
+	.decimation_below = 3,
 	.decimation_threshold = 8 * 3,
-	.decimation_above = 12,
+	.decimation_above = 4,
 };
 
-static struct ts_filter_mean_configuration gta01_ts_mean_config = {
-	.bits_filter_length = 5,
-	.averaging_threshold = 12
+static struct ts_filter_mean_configuration gta01_ts_mean = {
+	.length = 4,
 };
 
-static struct s3c2410_ts_mach_info gta01_ts_cfg = {
-	.delay = 10000,
-	.presc = 0xff, /* slow as we can go */
-	.filter_sequence = {
-		[0] = &ts_filter_group_api,
-		[1] = &ts_filter_median_api,
-		[2] = &ts_filter_mean_api,
-		[3] = &ts_filter_linear_api,
-	},
-	.filter_config = {
-		[0] = &gta01_ts_group_config,
-		[1] = &gta01_ts_median_config,
-		[2] = &gta01_ts_mean_config,
-		[3] = &gta01_ts_linear_config,
-	},
+static struct ts_filter_linear_configuration gta01_ts_linear = {
+	.constants = {1, 0, 0, 0, 1, 0, 1},	/* Don't modify coords. */
+	.coord0 = 0,
+	.coord1 = 1,
+};
+#endif
+
+struct ts_filter_configuration filter_configuration[] =
+{
+#ifdef CONFIG_TOUCHSCREEN_FILTER
+	{&ts_filter_group_api,		&gta01_ts_group.config},
+	{&ts_filter_median_api,		&gta01_ts_median.config},
+	{&ts_filter_mean_api,		&gta01_ts_mean.config},
+	{&ts_filter_linear_api,		&gta01_ts_linear.config},
+#endif
+	{NULL, NULL},
 };
-#else /* !CONFIG_TOUCHSCREEN_FILTER */
+
 static struct s3c2410_ts_mach_info gta01_ts_cfg = {
 	.delay = 10000,
 	.presc = 0xff, /* slow as we can go */
-	.filter_sequence = { NULL },
-	.filter_config = { NULL },
+	.filter_config = filter_configuration,
 };
-#endif
-
 
 /* SPI */