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V4L/DVB (6551): tda8290: rule out tda988x before detecting tda8290/tda8295

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To ensure prevention of detecting a tda9885/6/7 as a tda8290 or tda8295, we
will rule out the tda988x before testing the tda8290 / tda8295 id registers.

We read 8 bytes from the chip.  If they are all equal, then it is not a
tda829x, or some other error has occurred.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky 2007-11-04 11:03:22 -03:00 committed by Mauro Carvalho Chehab
parent 1f3a4e3285
commit a818e1c8f7
1 changed files with 16 additions and 0 deletions
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16
drivers/media/video/tda8290.c
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@ -746,6 +746,22 @@ int tda829x_probe(struct tuner *t)
unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 };
unsigned char addr_dto_lsb = 0x07;
unsigned char data;
#define PROBE_BUFFER_SIZE 8
unsigned char buf[PROBE_BUFFER_SIZE];
int i;
/* rule out tda9887, which would return the same byte repeatedly */
tuner_i2c_xfer_send(&i2c_props, soft_reset, 1);
tuner_i2c_xfer_recv(&i2c_props, buf, PROBE_BUFFER_SIZE);
for (i = 1; i < PROBE_BUFFER_SIZE; i++) {
if (buf[i] == buf[0])
continue;
break;
}
/* all bytes are equal, not a tda829x - probably a tda9887 */
if (i == PROBE_BUFFER_SIZE)
return -ENODEV;
if ((tda8290_probe(&i2c_props) == 0) ||
(tda8295_probe(&i2c_props) == 0))