[PATCH v4 4/9] bus: mhi: Centralize firmware image table selection at probe time

[Kishore Batta <kishore.batta@oss.qualcomm.com>]

The Sahara driver currently selects firmware image tables using
scattered, device specific conditionals in the probe path, making the
logic harder to  follow and extend.

Refactor firmware image table selection into a single, explicit probe-time
mechanism by introducing a variant table that captures device matching,
firmware image tables, firmware folder names, and streaming behavior in
one place.

This centralizes device specific decisions, simplifies the probe logic,
and avoids ad-hoc conditionals while preserving the existing behavior for
all supported AIC devices.

Signed-off-by: Kishore Batta <kishore.batta@oss.qualcomm.com>
---
 drivers/bus/mhi/sahara/sahara.c | 66 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 58 insertions(+), 8 deletions(-)

diff --git a/drivers/bus/mhi/sahara/sahara.c b/drivers/bus/mhi/sahara/sahara.c
index e3499977e7c6b53bc624a8eb00d0636f2ea63307..8f1c0d72066c0cf80c09d78bfc51df2e482133b9 100644
--- a/drivers/bus/mhi/sahara/sahara.c
+++ b/drivers/bus/mhi/sahara/sahara.c
@@ -180,6 +180,16 @@ struct sahara_context {
 	u32				read_data_length;
 	bool				is_mem_dump_mode;
 	bool				non_streaming;
+	const char			*fw_folder;
+};
+
+struct sahara_variant {
+	const char *match;
+	bool match_is_chan;
+	const char * const *image_table;
+	size_t table_size;
+	const char *fw_folder;
+	bool non_streaming;
 };
 
 static const char * const aic100_image_table[] = {
@@ -224,11 +234,50 @@ static const char * const aic200_image_table[] = {
 	[78] = "qcom/aic200/pvs.bin",
 };
 
+static const struct sahara_variant sahara_variants[] = {
+	{
+		.match = "AIC100",
+		.match_is_chan = false,
+		.image_table = aic100_image_table,
+		.table_size = ARRAY_SIZE(aic100_image_table),
+		.fw_folder = "aic100",
+		.non_streaming = true,
+	},
+	{
+		.match = "AIC200",
+		.match_is_chan = false,
+		.image_table = aic200_image_table,
+		.table_size = ARRAY_SIZE(aic200_image_table),
+		.fw_folder = "aic200",
+		.non_streaming = false,
+	}
+};
+
 static bool is_streaming(struct sahara_context *context)
 {
 	return !context->non_streaming;
 }
 
+static const struct sahara_variant *sahara_select_variant(struct mhi_device *mhi_dev,
+							  const struct mhi_device_id *id)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sahara_variants); i++) {
+		const struct sahara_variant *v = &sahara_variants[i];
+
+		if (v->match_is_chan) {
+			if (id && id->chan && !strcmp(id->chan, v->match))
+				return v;
+		} else {
+			if (mhi_dev->mhi_cntrl && mhi_dev->mhi_cntrl->name &&
+			    !strcmp(mhi_dev->mhi_cntrl->name, v->match))
+				return v;
+		}
+	}
+	return NULL;
+}
+
 static int sahara_find_image(struct sahara_context *context, u32 image_id)
 {
 	int ret;
@@ -797,6 +846,7 @@ static void sahara_read_data_processing(struct work_struct *work)
 
 static int sahara_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
 {
+	const struct sahara_variant *variant;
 	struct sahara_context *context;
 	int ret;
 	int i;
@@ -809,14 +859,14 @@ static int sahara_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_
 	if (!context->rx)
 		return -ENOMEM;
 
-	if (!strcmp(mhi_dev->mhi_cntrl->name, "AIC200")) {
-		context->image_table = aic200_image_table;
-		context->table_size = ARRAY_SIZE(aic200_image_table);
-	} else {
-		context->image_table = aic100_image_table;
-		context->table_size = ARRAY_SIZE(aic100_image_table);
-		context->non_streaming = true;
-	}
+	variant = sahara_select_variant(mhi_dev, id);
+	if (!variant)
+		return -ENODEV;
+
+	context->image_table = variant->image_table;
+	context->table_size = variant->table_size;
+	context->non_streaming = variant->non_streaming;
+	context->fw_folder = variant->fw_folder;
 
 	/*
 	 * There are two firmware implementations for READ_DATA handling.

-- 
2.34.1