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V4L/DVB (12780): tm6000: Improve handling of SMBus Write Byte commands followed by a read command.

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SMBus Write Byte commands followed by a read command on the same I2C
address are not sent out to the chip as they wouldn't have any effect.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Michel Ludwig 2007-07-18 10:26:38 -03:00 committed by Mauro Carvalho Chehab
parent a5adfbed09
commit 4f44dcec71
1 changed files with 7 additions and 0 deletions
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7
drivers/staging/tm6000/tm6000-i2c.c
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@ -141,6 +141,13 @@ static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
printk(" %02x", msgs[i].buf[byte]);
}
/* SMBus Write Byte command followed by a read command */
if(msgs[i].len == 1 && i+1 < num && msgs[i+1].flags & I2C_M_RD
&& msgs[i+1].addr == msgs[i].addr) {
prev_reg = msgs[i].buf[0];
continue;
}
rc = tm6000_read_write_usb (dev,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
REQ_16_SET_GET_I2CSEQ,