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[media] em28xx: consider the message length limitation of the i2c adapter when reading the eeprom 

EEPROMs are currently read in blocks of 16 bytes, but the em2800 is limited
to 4 bytes per read. All other chip variants support reading of max. 64 bytes
at once (according to the em258x datasheet; also verified with em2710, em2882,
and em28174).
Since em2800_i2c_recv_bytes() has been fixed to return with -EOPNOTSUPP when
more than 4 bytes are requested, EEPROM reading with this chip is broken.
It was actually broken before that change, too, it just didn't throw an error
because the i2c adapter silently returned trash data (for all reads >1 byte !).

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2013-01-03 14:27:06 -03:00 committed by Mauro Carvalho Chehab
parent 45f04e82d0
commit 90271964c9
1 changed files with 9 additions and 3 deletions
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12
drivers/media/usb/em28xx/em28xx-i2c.c
View File

@ -379,7 +379,7 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
{
unsigned char buf, *p = eedata;
struct em28xx_eeprom *em_eeprom = (void *)eedata;
int i, err, size = len, block;
int i, err, size = len, block, block_max;
if (dev->chip_id == CHIP_ID_EM2874 ||
dev->chip_id == CHIP_ID_EM28174 ||
@ -412,9 +412,15 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
dev->name, err);
return err;
}
if (dev->board.is_em2800)
block_max = 4;
else
block_max = 64;
while (size > 0) {
if (size > 16)
block = 16;
if (size > block_max)
block = block_max;
else
block = size;