Re: [PATCH] Add autodetection for xD cards

[Maxim Levitsky <maximlevitsky@gmail.com>]

On Fri, 2010-06-18 at 03:19 +0300, Maxim Levitsky wrote: 
> Hi,
> This is the patch implementing the detection in clean way.
> Note that I call it smartmedia because xD is direct succesor of
> smartmedia and other that different card package is equivalent to it.
> 
ping

> ---
> 
> 
> commit 2599cabd36770785a13bf884049d649d385fd80c
> Author: Maxim Levitsky <maximlevitsky@gmail.com>
> Date:   Fri Jun 18 02:08:48 2010 +0300
> 
> Add autodetection for xD/smartmedia cards
> This can easily be extended for other types of FTL
> Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
> 
> diff --git a/Makefile.am b/Makefile.am
> index bafe4c7..5e9234a 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -467,6 +467,21 @@ dist_udevrules_DATA += \
>  libexec_PROGRAMS += extras/mobile-action-modeswitch/mobile-action-modeswitch
>  
>  # ------------------------------------------------------------------------------
> +# mtd_probe - autoloads FTL module for mtd devices
> +# ------------------------------------------------------------------------------
> +extras_mtd_probe_mtd_probe_SOURCES =  \
> +							extras/mtd_probe/mtd_probe.c \
> +							extras/mtd_probe/mtd_probe.h \
> +							extras/mtd_probe/probe_smartmedia.c
> +
> +extras_mtd_probe_mtd_probe_CPPFLAGS = $(AM_CPPFLAGS)
> +
> +dist_udevrules_DATA += extras/mtd_probe/75-probe_mtd.rules
> +
> +libexec_PROGRAMS += extras/mtd_probe/mtd_probe
> + 
> +
> +# ------------------------------------------------------------------------------
>  # keymap - map custom hardware's multimedia keys
>  # ------------------------------------------------------------------------------
>  extras_keymap_keymap_SOURCES = extras/keymap/keymap.c
> diff --git a/extras/mtd_probe/75-probe_mtd.rules b/extras/mtd_probe/75-probe_mtd.rules
> new file mode 100644
> index 0000000..1d1b398
> --- /dev/null
> +++ b/extras/mtd_probe/75-probe_mtd.rules
> @@ -0,0 +1,10 @@
> +#probe mtd devices for FTL
> +
> +ACTION!="add", GOTO="mtd_probe_end"
> +
> +KERNEL="mtd*ro", IMPORT{program}="mtd_probe $tempnode"
> +KERNEL="mtd*ro", ENV{MTD_FTL}="smartmedia", RUN+="/sbin/modprobe sm_ftl"
> +
> +
> +LABEL="mtd_probe_end"
> +
> diff --git a/extras/mtd_probe/mtd_probe.c b/extras/mtd_probe/mtd_probe.c
> new file mode 100644
> index 0000000..d335b06
> --- /dev/null
> +++ b/extras/mtd_probe/mtd_probe.c
> @@ -0,0 +1,54 @@
> +/*
> + * mtd_probe.c
> + * This file is part of mtd_probe
> + *
> + * Copyright (C) 2010 - Maxim Levitsky
> + *
> + * mtd_probe is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * mtd_probe is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with mtd_probe; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, 
> + * Boston, MA  02110-1301  USA
> + */
> +#include "mtd_probe.h"
> +#include <stdio.h>
> +#include <sys/ioctl.h>
> +#include <mtd/mtd-user.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +#include <unistd.h>
> +#include <stdlib.h>
> +
> +int main(int argc, char** argv) {
> +
> +	if (argc != 2) {
> +		printf("usage: mtd_probe /dev/mtd[n]\n");
> +		return 1;
> +	}
> +
> +	int mtd_fd = open(argv[1], O_RDONLY);
> +	if (mtd_fd = -1) {
> +		perror("open");
> +		exit(-1);
> +	}
> +
> +	mtd_info_t mtd_info;
> +	int error = ioctl(mtd_fd, MEMGETINFO, &mtd_info);
> +	if (error = -1) {
> +		perror("ioctl");
> +		exit(-1);
> +	}
> +
> +	probe_smart_media(mtd_fd, &mtd_info);
> +	return -1;
> +}
> diff --git a/extras/mtd_probe/mtd_probe.h b/extras/mtd_probe/mtd_probe.h
> new file mode 100644
> index 0000000..845a7a1
> --- /dev/null
> +++ b/extras/mtd_probe/mtd_probe.h
> @@ -0,0 +1,51 @@
> +/*
> + * mtd_probe.h
> + * This file is part of mtd_probe
> + *
> + * Copyright (C) 2010 - Maxim Levitsky
> + *
> + * mtd_probe is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * mtd_probe is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with mtd_probe; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, 
> + * Boston, MA  02110-1301  USA
> + */
> +#include <mtd/mtd-user.h>
> +
> +/* Full oob structure as written on the flash */
> +struct sm_oob {
> +	uint32_t reserved;
> +	uint8_t data_status;
> +	uint8_t block_status;
> +	uint8_t lba_copy1[2];
> +	uint8_t ecc2[3];
> +	uint8_t lba_copy2[2];
> +	uint8_t ecc1[3];
> +} __attribute__((packed));
> +
> +
> +/* one sector is always 512 bytes, but it can consist of two nand pages */
> +#define SM_SECTOR_SIZE		512
> +
> +/* oob area is also 16 bytes, but might be from two pages */
> +#define SM_OOB_SIZE		16
> +
> +/* This is maximum zone size, and all devices that have more that one zone
> +   have this size */
> +#define SM_MAX_ZONE_SIZE 	1024
> +
> +/* support for small page nand */
> +#define SM_SMALL_PAGE 		256
> +#define SM_SMALL_OOB_SIZE	8
> +
> +
> +void probe_smart_media(int mtd_fd, mtd_info_t *info);
> diff --git a/extras/mtd_probe/probe_smartmedia.c b/extras/mtd_probe/probe_smartmedia.c
> new file mode 100644
> index 0000000..ab6edea
> --- /dev/null
> +++ b/extras/mtd_probe/probe_smartmedia.c
> @@ -0,0 +1,99 @@
> +/*
> + * probe_smartmedia.c
> + * This file is part of mtd_probe
> + *
> + * Copyright (C) 2010 - Maxim Levitsky
> + *
> + * mtd_probe is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * mtd_probe is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with mtd_probe; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, 
> + * Boston, MA  02110-1301  USA
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <mtd/mtd-user.h>
> +
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +#include <unistd.h>
> +#include <stdint.h>
> +#include <stdlib.h>
> +#include "mtd_probe.h"
> +
> +static const uint8_t cis_signature[] = {
> +	0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
> +};
> +
> +
> +void probe_smart_media(int mtd_fd, mtd_info_t* info) {
> +
> +	char* cis_buffer = malloc(SM_SECTOR_SIZE);
> +	if (!cis_buffer)
> +		return;
> +
> +	if (info->type != MTD_NANDFLASH)
> +		goto exit;
> +
> +	int sector_size = info->writesize;
> +	int block_size = info->erasesize;
> +	int size_in_megs = info->size / (1024 * 1024);
> +	int spare_count;
> +
> +
> +	if (sector_size != SM_SECTOR_SIZE && sector_size != SM_SMALL_PAGE)
> +		goto exit;
> +
> +	switch(size_in_megs) {
> +	case 1:
> +	case 2:
> +		spare_count = 6;
> +		break;
> +	case 4:
> +		spare_count = 12;
> +		break;
> +	default:
> +		spare_count = 24;
> +		break;
> +	}
> +
> +
> +	int offset;
> +	int cis_found = 0;
> +
> +	for (offset = 0 ; offset < block_size * spare_count ;
> +						offset += sector_size) {
> +
> +		lseek(mtd_fd, SEEK_SET, offset);
> +		if (read(mtd_fd, cis_buffer, SM_SECTOR_SIZE) = SM_SECTOR_SIZE){
> +			cis_found = 1;
> +			break;
> +		}
> +	}
> +
> +	if (!cis_found)
> +		goto exit;
> +
> +	if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 &&
> +		(memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature,
> +			sizeof(cis_signature)) != 0))
> +		goto exit;
> +
> +	printf("MTD_FTL=smartmedia\n");
> +	free(cis_buffer);
> +	exit(0);
> +exit:
> +	free(cis_buffer);
> +	return;
> +}
> 
>