Add some comments to document the commands that are sent to the encoder chips. Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx> Cc: Ian Abbott <abbotti@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/comedi/drivers/multiq3.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/staging/comedi/drivers/multiq3.c b/drivers/staging/comedi/drivers/multiq3.c index dac1879..02d41fc 100644 --- a/drivers/staging/comedi/drivers/multiq3.c +++ b/drivers/staging/comedi/drivers/multiq3.c @@ -65,17 +65,17 @@ #define MULTIQ3_ENC_CTRL_REG 0x0e /* - * flags for encoder control + * Encoder chip commands (from the programming manual) */ -#define MULTIQ3_CLOCK_DATA 0x00 -#define MULTIQ3_CLOCK_SETUP 0x18 -#define MULTIQ3_INPUT_SETUP 0x41 -#define MULTIQ3_QUAD_X4 0x38 -#define MULTIQ3_BP_RESET 0x01 -#define MULTIQ3_CNTR_RESET 0x02 -#define MULTIQ3_TRSFRPR_CTR 0x08 -#define MULTIQ3_TRSFRCNTR_OL 0x10 -#define MULTIQ3_EFLAG_RESET 0x06 +#define MULTIQ3_CLOCK_DATA 0x00 /* FCK frequency divider */ +#define MULTIQ3_CLOCK_SETUP 0x18 /* xfer PR0 to PSC */ +#define MULTIQ3_INPUT_SETUP 0x41 /* enable inputs A and B */ +#define MULTIQ3_QUAD_X4 0x38 /* quadrature */ +#define MULTIQ3_BP_RESET 0x01 /* reset byte pointer */ +#define MULTIQ3_CNTR_RESET 0x02 /* reset counter */ +#define MULTIQ3_TRSFRPR_CTR 0x08 /* xfre preset reg to counter */ +#define MULTIQ3_TRSFRCNTR_OL 0x10 /* xfer CNTR to OL (x and y) */ +#define MULTIQ3_EFLAG_RESET 0x06 /* reset E bit of flag reg */ #define MULTIQ3_TIMEOUT 30 -- 2.5.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
