drivers/comedi/drivers/ni_labpc.c

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

File Facts

System
Linux kernel
Corpus path
drivers/comedi/drivers/ni_labpc.c
Extension
.c
Size
3490 bytes
Lines
117
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

// SPDX-License-Identifier: GPL-2.0+
/*
 * comedi/drivers/ni_labpc.c
 * Driver for National Instruments Lab-PC series boards and compatibles
 * Copyright (C) 2001-2003 Frank Mori Hess <fmhess@users.sourceforge.net>
 */

/*
 * Driver: ni_labpc
 * Description: National Instruments Lab-PC (& compatibles)
 * Devices: [National Instruments] Lab-PC-1200 (lab-pc-1200),
 *   Lab-PC-1200AI (lab-pc-1200ai), Lab-PC+ (lab-pc+)
 * Author: Frank Mori Hess <fmhess@users.sourceforge.net>
 * Status: works
 *
 * Configuration options - ISA boards:
 *   [0] - I/O port base address
 *   [1] - IRQ (optional, required for timed or externally triggered
 *		conversions)
 *   [2] - DMA channel (optional)
 *
 * Tested with lab-pc-1200.  For the older Lab-PC+, not all input
 * ranges and analog references will work, the available ranges/arefs
 * will depend on how you have configured the jumpers on your board
 * (see your owner's manual).
 *
 * Kernel-level ISA plug-and-play support for the lab-pc-1200 boards
 * has not yet been added to the driver, mainly due to the fact that
 * I don't know the device id numbers. If you have one of these boards,
 * please file a bug report at https://comedi.org/ so I can get the
 * necessary information from you.
 *
 * The 1200 series boards have onboard calibration dacs for correcting
 * analog input/output offsets and gains. The proper settings for these
 * caldacs are stored on the board's eeprom. To read the caldac values
 * from the eeprom and store them into a file that can be then be used
 * by comedilib, use the comedi_calibrate program.
 *
 * The Lab-pc+ has quirky chanlist requirements when scanning multiple
 * channels. Multiple channel scan sequence must start at highest channel,
 * then decrement down to channel 0. The rest of the cards can scan down
 * like lab-pc+ or scan up from channel zero. Chanlists consisting of all
 * one channel are also legal, and allow you to pace conversions in bursts.
 *
 * NI manuals:
 * 341309a (labpc-1200 register manual)
 * 320502b (lab-pc+)
 */

#include <linux/module.h>
#include <linux/comedi/comedidev.h>

#include "ni_labpc.h"
#include "ni_labpc_isadma.h"

static const struct labpc_boardinfo labpc_boards[] = {
	{
		.name			= "lab-pc-1200",
		.ai_speed		= 10000,
		.ai_scan_up		= 1,
		.has_ao			= 1,
		.is_labpc1200		= 1,
	}, {
		.name			= "lab-pc-1200ai",
		.ai_speed		= 10000,
		.ai_scan_up		= 1,
		.is_labpc1200		= 1,
	}, {
		.name			= "lab-pc+",
		.ai_speed		= 12000,
		.has_ao			= 1,
	},
};

static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
	unsigned int irq = it->options[1];
	unsigned int dma_chan = it->options[2];
	int ret;

	ret = comedi_check_request_region(dev, it->options[0], 0x20,
					  0, 0x3ff, 32);
	if (ret)
		return ret;

	ret = labpc_common_attach(dev, irq, 0);
	if (ret)
		return ret;

	if (dev->irq)

Annotation

Implementation Notes