Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 57d4114d authored by Venkata Rao Kakani's avatar Venkata Rao Kakani
Browse files

drivers: rename_block: Enable A/B support 



Enable A/B support by appending slot suffix based on
androidboot.slot_suffix.

Change-Id: I7bdc798f6203ba026606d56cf0bc76e0cfbb6b4a
Signed-off-by: default avatarVenkata Rao Kakani <vkakani@codeaurora.org>
parent 45a12290

drivers/soc/qcom/rename_block_device.c

+38 −3
Original line number Diff line number Diff line
@@ -10,6 +10,39 @@ 
#include <linux/device.h>

#include <linux/of.h>

#define PATH_SIZE	32

#define SLOT_STR_LENGTH 3

#define MAX_STR_SIZE 255



static char active_slot[SLOT_STR_LENGTH];

static char backup_slot[SLOT_STR_LENGTH];

static int dp_enabled;

static char final_name[MAX_STR_SIZE];

static int __init set_slot_suffix(char *str)

{

	if (str) {

		strlcpy(active_slot, str, SLOT_STR_LENGTH);

		strcmp(active_slot, "_a") ?

		strlcpy(backup_slot, "_a", SLOT_STR_LENGTH) :

		strlcpy(backup_slot, "_b", SLOT_STR_LENGTH);

		dp_enabled = 1;

	}

	return 1;

}

__setup("androidboot.slot_suffix=", set_slot_suffix);



static void get_slot_updated_name(char *name)

{

	int length = strlen(name);



	memset(final_name, '\0', MAX_STR_SIZE);

	strlcpy(final_name, name, MAX_STR_SIZE);

	if (dp_enabled && (final_name[length-2] == '_')) {

		if (final_name[length-1] == 'a')

			final_name[length-1] = active_slot[1];

		else if (final_name[length-1] == 'b')

			final_name[length-1] = backup_slot[1];

	}

}



static int rename_blk_dev_init(void)

{
@@ -18,7 +51,8 @@ static int rename_blk_dev_init(void) 
	struct gendisk *disk;

	struct device_node *node;

	char dev_path[PATH_SIZE];

	const char *actual_name, *modified_name;

	const char *actual_name;

	char *modified_name;



	node = of_find_compatible_node(NULL, NULL, "qcom,blkdev-rename");

	if (!node) {
@@ -40,8 +74,9 @@ static int rename_blk_dev_init(void) 
			return -ENXIO;

		}

		if (!of_property_read_string_index(node, "rename-dev", index,

							&modified_name)) {

			device_rename(disk_to_dev(disk), modified_name);

						(const char **)&modified_name)) {

			get_slot_updated_name(modified_name);

			device_rename(disk_to_dev(disk), final_name);

		} else {

			pr_err("rename-dev for actual-dev = %s is missing\n",

								 actual_name);