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Commit 41cdd822 authored by Patrick Jacques's avatar Patrick Jacques
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android_os_Power: TARGET_RECOVERY_WRITE_MISC_PART support 

Some devices write a padded message to the misc partitions for the
bootloader to pickup and enable recovery mode.  Enable support by
defining the 'misc' mtd partition number using:
TARGET_RECOVERY_WRITE_MISC_PART in BoardConfig.

Requires mtd misc device to be writeable by user system

Change-Id: Iffd88b07696f138d7127acda5b42ede55b468205
parent 5d4bc4e0

core/jni/Android.mk

+4 −0
Original line number Diff line number Diff line
@@ -249,6 +249,10 @@ endif 


LOCAL_MODULE:= libandroid_runtime



ifneq ($(TARGET_RECOVERY_WRITE_MISC_PART),)

        LOCAL_CFLAGS += -DRECOVERY_WRITE_MISC_PART='$(TARGET_RECOVERY_WRITE_MISC_PART)'

endif



include $(BUILD_SHARED_LIBRARY)



include $(call all-makefiles-under,$(LOCAL_PATH))

core/jni/android_os_Power.cpp

+89 −0
Original line number Diff line number Diff line
@@ -22,6 +22,14 @@ 
#include <hardware_legacy/power.h>

#include <sys/reboot.h>



#if RECOVERY_WRITE_MISC_PART

#include <fcntl.h>

#include <sys/mount.h>

#include <mtd/mtd-user.h>

#define MTD_PROC_FILENAME   "/proc/mtd"

#define BOOT_CMD_SIZE       32

#endif



namespace android

{
@@ -83,6 +91,84 @@ static void android_os_Power_shutdown(JNIEnv *env, jobject clazz) 
#endif

}



#if RECOVERY_WRITE_MISC_PART

struct bootloader_message {

    char command[32];

    char status[32];

    char recovery[1024];

    char stub[2048 - 32 - 32 - 1024];

};



static char command[2048]; // block size buffer

static int mtdnum = -1;

static int mtdsize = 0;

static int mtderasesize = 0x20000 * 512;

static char mtdname[64];

static char mtddevname[32];



static int init_mtd_info() {

	if (mtdnum >= 0) {

		return 0;

	}

    int fd = open(MTD_PROC_FILENAME, O_RDONLY);

    if (fd < 0) {

        return (mtdnum = -1);

    }

    int nbytes = read(fd, command, sizeof(command) - 1);

    close(fd);

    if (nbytes < 0) {

        return (mtdnum = -2);

    }

    command[nbytes] = '\0';

	char *cursor = command;

	while (nbytes-- > 0 && *(cursor++) != '\n'); // skip one line

	while (nbytes > 0) {

		int matches = sscanf(cursor, "mtd%d: %x %x \"%63s[^\"]", &mtdnum, &mtdsize, &mtderasesize, mtdname);

		if (matches == ( RECOVERY_WRITE_MISC_PART )) {

			if (strncmp("misc", mtdname, ( RECOVERY_WRITE_MISC_PART )) == 0) {

				sprintf(mtddevname, "/dev/mtd/mtd%d", mtdnum);

				//printf("Partition for parameters: %s\n", mtddevname);

				return 0;

			}

			while (nbytes-- > 0 && *(cursor++) != '\n'); // skip a line

		}

	}

    return (mtdnum = -3);

}



int set_message(char* cmd) {

        int fd;

        int pos = 2048;

        if (init_mtd_info() != 0) {

                return -9;

        }

        fd = open(mtddevname, O_RDWR);

    if (fd < 0) {

        return fd;

    }

    struct erase_info_user erase_info;

    erase_info.start = 0;

    erase_info.length = mtderasesize;

    if (ioctl(fd, MEMERASE, &erase_info) < 0) {

                fprintf(stderr, "mtd: erase failure at 0x%08x (%s)\n", pos, strerror(errno));

    }

        if (lseek(fd, pos, SEEK_SET) != pos) {

                close(fd);

                return pos;

        }

        memset(&command, 0, sizeof(command));

        strncpy(command, cmd, strlen(cmd));

        pos = write(fd, command, sizeof(command));

        //printf("Written %d bytes\n", pos);

        if (pos < 0) {

                close(fd);

        return pos;

    }

        close(fd);

    return 0;

}

#endif  // RECOVERY_WRITE_MISC_PART



static void android_os_Power_reboot(JNIEnv *env, jobject clazz, jstring reason)

{

    sync();
@@ -94,6 +180,9 @@ static void android_os_Power_reboot(JNIEnv *env, jobject clazz, jstring reason) 
#ifdef RECOVERY_PRE_COMMAND

	if (!strncmp(chars,"recovery",8))

		system( RECOVERY_PRE_COMMAND );

#endif

#if RECOVERY_WRITE_MISC_PART

	set_message((char*)chars);

#endif

        __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,

                 LINUX_REBOOT_CMD_RESTART2, (char*) chars);