diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_at_ao.c | 139 |
1 files changed, 88 insertions, 51 deletions
diff --git a/drivers/staging/comedi/drivers/ni_at_ao.c b/drivers/staging/comedi/drivers/ni_at_ao.c index bba5bc0c036b..cbf2b0c40347 100644 --- a/drivers/staging/comedi/drivers/ni_at_ao.c +++ b/drivers/staging/comedi/drivers/ni_at_ao.c @@ -43,23 +43,15 @@ Configuration options: * Register map */ #define ATAO_DIO_REG 0x00 -#define ATAO_CFG2 0x02 /* W 16 */ -#define CALLD1 (1 << 15) -#define CALLD0 (1 << 14) -#define FFRTEN (1 << 13) -#define DAC2S8 (1 << 12) -#define DAC2S6 (1 << 11) -#define DAC2S4 (1 << 10) -#define DAC2S2 (1 << 9) -#define DAC2S0 (1 << 8) -#define LDAC8 (1 << 7) -#define LDAC6 (1 << 6) -#define LDAC4 (1 << 5) -#define LDAC2 (1 << 4) -#define LDAC0 (1 << 3) -#define PROMEN (1 << 2) -#define SCLK (1 << 1) -#define SDATA (1 << 0) +#define ATAO_CFG2_REG 0x02 +#define ATAO_CFG2_CALLD_NOP (0 << 14) +#define ATAO_CFG2_CALLD(x) ((((x) >> 3) + 1) << 14) +#define ATAO_CFG2_FFRTEN (1 << 13) +#define ATAO_CFG2_DACS(x) (1 << (((x) / 2) + 8)) +#define ATAO_CFG2_LDAC(x) (1 << (((x) / 2) + 3)) +#define ATAO_CFG2_PROMEN (1 << 2) +#define ATAO_CFG2_SCLK (1 << 1) +#define ATAO_CFG2_SDATA (1 << 0) #define ATAO_CFG3 0x04 /* W 16 */ #define DMAMODE (1 << 6) #define CLKOUT (1 << 5) @@ -147,6 +139,9 @@ struct atao_private { /* Used for AO readback */ unsigned int ao_readback[10]; + + /* Used for caldac readback */ + unsigned char caldac[21]; }; static void atao_reset(struct comedi_device *dev) @@ -162,7 +157,7 @@ static void atao_reset(struct comedi_device *dev) outb(0x03, dev->iobase + ATAO_82C53_CNTR1); outb(CNTRSEL0 | RWSEL0 | MODESEL2, dev->iobase + ATAO_82C53_CNTRCMD); - outw(0, dev->iobase + ATAO_CFG2); + outw(ATAO_CFG2_CALLD_NOP, dev->iobase + ATAO_CFG2_REG); devpriv->cfg3 = 0; outw(devpriv->cfg3, dev->iobase + ATAO_CFG3); @@ -265,41 +260,83 @@ static int atao_dio_insn_config(struct comedi_device *dev, } /* - * Figure 2-1 in the manual shows 3 chips labeled DAC8800, which - * are 8-channel 8-bit DACs. These are most likely the calibration - * DACs. It is not explicitly stated in the manual how to access - * the caldacs, but we can guess. + * There are three DAC8800 TrimDACs on the board. These are 8-channel, + * 8-bit DACs that are used to calibrate the Analog Output channels. + * The factory default calibration values are stored in the EEPROM. + * The TrimDACs, and EEPROM addresses, are mapped as: + * + * Channel EEPROM Description + * ----------------- ------ ----------------------------------- + * 0 - DAC0 Chan 0 0x30 AO Channel 0 Offset + * 1 - DAC0 Chan 1 0x31 AO Channel 0 Gain + * 2 - DAC0 Chan 2 0x32 AO Channel 1 Offset + * 3 - DAC0 Chan 3 0x33 AO Channel 1 Gain + * 4 - DAC0 Chan 4 0x34 AO Channel 2 Offset + * 5 - DAC0 Chan 5 0x35 AO Channel 2 Gain + * 6 - DAC0 Chan 6 0x36 AO Channel 3 Offset + * 7 - DAC0 Chan 7 0x37 AO Channel 3 Gain + * 8 - DAC1 Chan 0 0x38 AO Channel 4 Offset + * 9 - DAC1 Chan 1 0x39 AO Channel 4 Gain + * 10 - DAC1 Chan 2 0x3a AO Channel 5 Offset + * 11 - DAC1 Chan 3 0x3b AO Channel 5 Gain + * 12 - DAC1 Chan 4 0x3c 2.5V Offset + * 13 - DAC1 Chan 5 0x3d AO Channel 6 Offset (at-ao-10 only) + * 14 - DAC1 Chan 6 0x3e AO Channel 6 Gain (at-ao-10 only) + * 15 - DAC1 Chan 7 0x3f AO Channel 7 Offset (at-ao-10 only) + * 16 - DAC2 Chan 0 0x40 AO Channel 7 Gain (at-ao-10 only) + * 17 - DAC2 Chan 1 0x41 AO Channel 8 Offset (at-ao-10 only) + * 18 - DAC2 Chan 2 0x42 AO Channel 8 Gain (at-ao-10 only) + * 19 - DAC2 Chan 3 0x43 AO Channel 9 Offset (at-ao-10 only) + * 20 - DAC2 Chan 4 0x44 AO Channel 9 Gain (at-ao-10 only) + * DAC2 Chan 5 0x45 Reserved + * DAC2 Chan 6 0x46 Reserved + * DAC2 Chan 7 0x47 Reserved */ -static int atao_calib_insn_read(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) -{ - int i; - for (i = 0; i < insn->n; i++) - data[i] = 0; /* XXX */ - return insn->n; -} - static int atao_calib_insn_write(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { struct atao_private *devpriv = dev->private; - unsigned int bitstring, bit; unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int bitstring; + unsigned int val; + int bit; + + if (insn->n == 0) + return 0; + + devpriv->caldac[chan] = data[insn->n - 1] & s->maxdata; + + /* write the channel and last data value to the caldac */ + bitstring = ((chan & 0x7) << 8) | devpriv->caldac[chan]; - bitstring = ((chan & 0x7) << 8) | (data[insn->n - 1] & 0xff); + /* clock the bitstring to the caldac; MSB -> LSB */ + for (bit = 1 << 10; bit; bit >>= 1) { + val = (bit & bitstring) ? ATAO_CFG2_SDATA : 0; - for (bit = 1 << (11 - 1); bit; bit >>= 1) { - outw(((bit & bitstring) ? SDATA : 0), - dev->iobase + ATAO_CFG2); - outw(SCLK | ((bit & bitstring) ? SDATA : 0), - dev->iobase + ATAO_CFG2); + outw(val, dev->iobase + ATAO_CFG2_REG); + outw(val | ATAO_CFG2_SCLK, dev->iobase + ATAO_CFG2_REG); } - /* strobe the appropriate caldac */ - outw((((chan >> 3) + 1) << 14), - dev->iobase + ATAO_CFG2); - outw(0, dev->iobase + ATAO_CFG2); + + /* strobe the caldac to load the value */ + outw(ATAO_CFG2_CALLD(chan), dev->iobase + ATAO_CFG2_REG); + outw(ATAO_CFG2_CALLD_NOP, dev->iobase + ATAO_CFG2_REG); + + return insn->n; +} + +static int atao_calib_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct atao_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + int i; + + for (i = 0; i < insn->n; i++) + data[i] = devpriv->caldac[chan]; return insn->n; } @@ -349,14 +386,14 @@ static int atao_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->insn_bits = atao_dio_insn_bits; s->insn_config = atao_dio_insn_config; - s = &dev->subdevices[2]; /* caldac subdevice */ - s->type = COMEDI_SUBD_CALIB; - s->subdev_flags = SDF_WRITABLE | SDF_INTERNAL; - s->n_chan = 21; - s->maxdata = 0xff; - s->insn_read = atao_calib_insn_read; - s->insn_write = atao_calib_insn_write; + s = &dev->subdevices[2]; + s->type = COMEDI_SUBD_CALIB; + s->subdev_flags = SDF_WRITABLE | SDF_INTERNAL; + s->n_chan = (board->n_ao_chans * 2) + 1; + s->maxdata = 0xff; + s->insn_read = atao_calib_insn_read; + s->insn_write = atao_calib_insn_write; s = &dev->subdevices[3]; /* eeprom subdevice */ |