Hi folks,
I am developing a driver for the Ambient Light Sensor BH1710FVC that
communicates by i2c bus. My problem is that the type of message that
this chip accept is this:
S Addr Rd [A] [DataHigh] A [DataLow] NA P
I searched in the file "Documentation/i2c/smbus-protocol" for one
function that communicate like this, but I did not find. I tried to
use the function i2c_smbus_read_byte twice (reading data high first
and so the data low), but the chip do not accept communicate this way.
So I've based in the function i2c_smbus_read_byte to build the
function that implements the protocol like I need.
I modified the file i2c-core.c in the function i2c_smbus_xfer_emulated
creating an I2C_SMBUS_WORD.
In first switch I add:
case I2C_SMBUS_WORD:
if (read_write == I2C_SMBUS_READ) {
msg[0].len = 2;
msg[0].flags = I2C_M_RD | flags;
num = 1;
}
break;
and for the second switch I added the following case:
case I2C_SMBUS_WORD:
data->word = msgbuf0[0] | (msgbuf0[1] << 8);
break;
After this modification my Ambient Light Sensor driver is working just fine.
So I want to know if there is a better way to implement this without
need to modify the i2c driver.
Regards,
Rogerio
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