drivers/comedi/drivers/cb_das16_cs.c

Source file repositories/reference/linux-study-clean/drivers/comedi/drivers/cb_das16_cs.c

File Facts

System
Linux kernel
Corpus path
drivers/comedi/drivers/cb_das16_cs.c
Extension
.c
Size
12775 bytes
Lines
455
Domain
Driver Families
Bucket
drivers/comedi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct das16cs_board {
	const char *name;
	int device_id;
	unsigned int has_ao:1;
	unsigned int has_4dio:1;
};

static const struct das16cs_board das16cs_boards[] = {
	{
		.name		= "PC-CARD DAS16/16-AO",
		.device_id	= 0x0039,
		.has_ao		= 1,
		.has_4dio	= 1,
	}, {
		.name		= "PCM-DAS16s/16",
		.device_id	= 0x4009,
	}, {
		.name		= "PC-CARD DAS16/16",
		.device_id	= 0x0000,	/* unknown */
	},
};

struct das16cs_private {
	unsigned short misc1;
	unsigned short misc2;
};

static const struct comedi_lrange das16cs_ai_range = {
	4, {
		BIP_RANGE(10),
		BIP_RANGE(5),
		BIP_RANGE(2.5),
		BIP_RANGE(1.25),
	}
};

static int das16cs_ai_eoc(struct comedi_device *dev,
			  struct comedi_subdevice *s,
			  struct comedi_insn *insn,
			  unsigned long context)
{
	unsigned int status;

	status = inw(dev->iobase + DAS16CS_MISC1_REG);
	if (status & DAS16CS_MISC1_EOC)
		return 0;
	return -EBUSY;
}

static int das16cs_ai_insn_read(struct comedi_device *dev,
				struct comedi_subdevice *s,
				struct comedi_insn *insn,
				unsigned int *data)
{
	struct das16cs_private *devpriv = dev->private;
	int chan = CR_CHAN(insn->chanspec);
	int range = CR_RANGE(insn->chanspec);
	int aref = CR_AREF(insn->chanspec);
	int ret;
	int i;

	outw(DAS16CS_AI_MUX_SINGLE_CHAN(chan),
	     dev->iobase + DAS16CS_AI_MUX_REG);

	/* disable interrupts, software convert */
	devpriv->misc1 &= ~(DAS16CS_MISC1_INTE | DAS16CS_MISC1_INT_SRC_MASK |
			      DAS16CS_MISC1_AI_CONV_MASK);
	if (aref == AREF_DIFF)
		devpriv->misc1 &= ~DAS16CS_MISC1_SEDIFF;
	else
		devpriv->misc1 |= DAS16CS_MISC1_SEDIFF;
	outw(devpriv->misc1, dev->iobase + DAS16CS_MISC1_REG);

	devpriv->misc2 &= ~(DAS16CS_MISC2_BME | DAS16CS_MISC2_AI_GAIN_MASK);
	switch (range) {
	case 0:
		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_1;
		break;
	case 1:
		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_2;
		break;
	case 2:
		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_4;
		break;
	case 3:
		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_8;
		break;
	}
	outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);

Annotation

Implementation Notes