REG_PID           645 drivers/media/i2c/ov7670.c 	ret = ov7670_read(sd, REG_PID, &v);
REG_PID          1471 drivers/media/i2c/ov9650.c 	ret = ov965x_read(ov965x, REG_PID, &pid);
REG_PID           377 drivers/media/usb/stkwebcam/stk-sensor.c 	if (stk_sensor_inb(dev, REG_PID, &idh)