Commit 500de115 authored by Oleg Dzhimiev's avatar Oleg Dzhimiev

serial + revision to sysfs

parent b919c96a
......@@ -51,15 +51,22 @@
static char *bootargs;
static struct mtd_info *mtd;
static char *boardinfo;
static char serial[13];
//static char *serial;
static char revision[8];
//static char *revision;
static int __init elphel393_init_init (void)
struct device_node *node;
int len=0;
node = of_find_node_by_name(NULL, "chosen");
//just throw an error
if (!node)
if (!node){
pr_err("Device tree node 'chosen' not found.");
return -ENODEV;
......@@ -67,7 +74,6 @@ static int __init elphel393_init_init (void)
if (bootargs!=NULL) {
pr_debug("bootargs line from device tree is %s",bootargs);
return 0;
......@@ -84,15 +90,15 @@ static ssize_t get_bootargs(struct device *dev, struct device_attribute *attr, c
static ssize_t get_boardinfo(struct device *dev, struct device_attribute *attr, char *buf)
return sprintf(buf,"%s\n",bootargs);
return sprintf(buf,"%s\n",boardinfo);
static ssize_t get_revision(struct device *dev, struct device_attribute *attr, char *buf)
return sprintf(buf,"%s\n",bootargs);
return sprintf(buf,"%s\n",revision);
static ssize_t get_serial(struct device *dev, struct device_attribute *attr, char *buf)
return sprintf(buf,"%s\n",bootargs);
return sprintf(buf,"%s\n",serial);
static DEVICE_ATTR(bootargs , SYSFS_PERMISSIONS & SYSFS_READONLY, get_bootargs , NULL);
......@@ -137,6 +143,19 @@ static int elphel393_init_probe(struct platform_device *pdev)
u8 devnum=-1;
u8 unlock= 0;
size_t retlen;
//size of nand flash page
char kbuf[2048];
int page_limit = 3;
size_t count;
size_t size;
int len;
loff_t *ppos;
loff_t pos;
int ret;
char *test;
char *ps,*pe;
//copy bootargs string
bootargs_copy = kstrdup(bootargs,GFP_KERNEL);
......@@ -165,14 +184,80 @@ static int elphel393_init_probe(struct platform_device *pdev)
//unlock /dev/mtdN partition
// unlock /dev/mtdN partition
// if there's no need to unlock, get /dev/mtd0
if (unlock&&(devnum>=0)){
mtd = get_mtd_device(NULL,devnum);
pr_info("/dev/mtd%d: unlocked",devnum);
mtd = get_mtd_device(NULL,0);
if (!mtd){
pr_err("Get mtd device error\n");
return mtd;
// read boardinfo record
// * device number is not important
// * no need to unlock
// page size
BUG_ON(mtd->writesize > 2048);
size = mtd->writesize;
// search within page_limit pages area
count = page_limit*(mtd->writesize);
// starting offset
pos = 0;
ppos = &pos;
// memory for boardinfo
boardinfo = kmalloc(size,GFP_KERNEL);
if (!boardinfo)
return -ENOMEM;
//serial = kmalloc(13,GFP_KERNEL);
//if (!serial)
// return -ENOMEM;
// tmp buffer
//kbuf = kmalloc(size,GFP_KERNEL);
//if (!kbuf)
// return -ENOMEM;
pr_info("counting(\255 /255): %d\n",count);
len = min_t(size_t,count, size);
pr_info("len is: %d\n",len);
ret = mtd_read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
if (!ret){
pr_err("flash page read, code %d",ret);
pr_info("superfunction returned: %d",ret);
pr_info("And the buf contents are: %s\n",kbuf);
// do whatever we like with the kbuf
// search for "<board>"
// expecting to find it somewhere...
pr_info("Clap along if you feel that happiness is the truth\n");
//...right in the beginning or error
ps = strnstr(kbuf,"<serial>",size);
ps = strnstr(kbuf,"<rev>",size);
*ppos += retlen;
count -= retlen;
//look in the nand drivers how to do this:
//read the factory info string from NAND flash otp area - look in the 1st page?
......@@ -184,7 +269,7 @@ static int elphel393_init_probe(struct platform_device *pdev)
//struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, uint8_t *buf
return 0;
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