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Some of the header files in "drivers/comedi/drivers/" are common enough to be useful to out-of-tree comedi driver modules. Using them for out-of-tree module builds is hampered by the headers being outside the "include/" directory so it is desirable to move them. There are about a couple of dozen Comedi device drivers that use the "comedi_8255" module to add digital I/O subdevices based on the venerable 8255 Programmable Peripheral Interface chip. The macros and declarations to use that module are in the "8255.h" header file in the comedi "drivers" directory. Move it into "include/linux/comedi/" and rename it to "comedi_8255.h" for naming consistency reasons. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20211117120604.117740-4-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
275 lines
8 KiB
C
275 lines
8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi_8255.c
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* Generic 8255 digital I/O support
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*
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* Split from the Comedi "8255" driver module.
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
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*/
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/*
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* Module: comedi_8255
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* Description: Generic 8255 support
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* Author: ds
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* Updated: Fri, 22 May 2015 12:14:17 +0000
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* Status: works
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*
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* This module is not used directly by end-users. Rather, it is used by
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* other drivers to provide support for an 8255 "Programmable Peripheral
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* Interface" (PPI) chip.
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*
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* The classic in digital I/O. The 8255 appears in Comedi as a single
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* digital I/O subdevice with 24 channels. The channel 0 corresponds to
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* the 8255's port A, bit 0; channel 23 corresponds to port C, bit 7.
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* Direction configuration is done in blocks, with channels 0-7, 8-15,
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* 16-19, and 20-23 making up the 4 blocks. The only 8255 mode
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* supported is mode 0.
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*/
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#include <linux/module.h>
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#include <linux/comedi/comedidev.h>
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#include <linux/comedi/comedi_8255.h>
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struct subdev_8255_private {
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unsigned long regbase;
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int (*io)(struct comedi_device *dev, int dir, int port, int data,
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unsigned long regbase);
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};
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static int subdev_8255_io(struct comedi_device *dev,
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int dir, int port, int data, unsigned long regbase)
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{
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if (dir) {
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outb(data, dev->iobase + regbase + port);
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return 0;
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}
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return inb(dev->iobase + regbase + port);
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}
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static int subdev_8255_mmio(struct comedi_device *dev,
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int dir, int port, int data, unsigned long regbase)
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{
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if (dir) {
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writeb(data, dev->mmio + regbase + port);
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return 0;
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}
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return readb(dev->mmio + regbase + port);
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}
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static int subdev_8255_insn(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data)
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{
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struct subdev_8255_private *spriv = s->private;
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unsigned long regbase = spriv->regbase;
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unsigned int mask;
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unsigned int v;
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mask = comedi_dio_update_state(s, data);
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if (mask) {
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if (mask & 0xff)
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spriv->io(dev, 1, I8255_DATA_A_REG,
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s->state & 0xff, regbase);
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if (mask & 0xff00)
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spriv->io(dev, 1, I8255_DATA_B_REG,
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(s->state >> 8) & 0xff, regbase);
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if (mask & 0xff0000)
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spriv->io(dev, 1, I8255_DATA_C_REG,
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(s->state >> 16) & 0xff, regbase);
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}
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v = spriv->io(dev, 0, I8255_DATA_A_REG, 0, regbase);
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v |= (spriv->io(dev, 0, I8255_DATA_B_REG, 0, regbase) << 8);
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v |= (spriv->io(dev, 0, I8255_DATA_C_REG, 0, regbase) << 16);
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data[1] = v;
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return insn->n;
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}
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static void subdev_8255_do_config(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct subdev_8255_private *spriv = s->private;
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unsigned long regbase = spriv->regbase;
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int config;
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config = I8255_CTRL_CW;
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/* 1 in io_bits indicates output, 1 in config indicates input */
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if (!(s->io_bits & 0x0000ff))
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config |= I8255_CTRL_A_IO;
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if (!(s->io_bits & 0x00ff00))
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config |= I8255_CTRL_B_IO;
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if (!(s->io_bits & 0x0f0000))
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config |= I8255_CTRL_C_LO_IO;
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if (!(s->io_bits & 0xf00000))
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config |= I8255_CTRL_C_HI_IO;
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spriv->io(dev, 1, I8255_CTRL_REG, config, regbase);
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}
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static int subdev_8255_insn_config(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data)
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{
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unsigned int chan = CR_CHAN(insn->chanspec);
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unsigned int mask;
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int ret;
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if (chan < 8)
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mask = 0x0000ff;
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else if (chan < 16)
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mask = 0x00ff00;
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else if (chan < 20)
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mask = 0x0f0000;
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else
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mask = 0xf00000;
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ret = comedi_dio_insn_config(dev, s, insn, data, mask);
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if (ret)
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return ret;
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subdev_8255_do_config(dev, s);
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return insn->n;
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}
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static int __subdev_8255_init(struct comedi_device *dev,
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struct comedi_subdevice *s,
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int (*io)(struct comedi_device *dev,
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int dir, int port, int data,
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unsigned long regbase),
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unsigned long regbase,
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bool is_mmio)
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{
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struct subdev_8255_private *spriv;
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spriv = comedi_alloc_spriv(s, sizeof(*spriv));
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if (!spriv)
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return -ENOMEM;
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if (io)
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spriv->io = io;
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else if (is_mmio)
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spriv->io = subdev_8255_mmio;
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else
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spriv->io = subdev_8255_io;
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spriv->regbase = regbase;
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s->type = COMEDI_SUBD_DIO;
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s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
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s->n_chan = 24;
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s->range_table = &range_digital;
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s->maxdata = 1;
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s->insn_bits = subdev_8255_insn;
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s->insn_config = subdev_8255_insn_config;
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subdev_8255_do_config(dev, s);
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return 0;
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}
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/**
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* subdev_8255_init - initialize DIO subdevice for driving I/O mapped 8255
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* @dev: comedi device owning subdevice
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* @s: comedi subdevice to initialize
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* @io: (optional) register I/O call-back function
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* @regbase: offset of 8255 registers from dev->iobase, or call-back context
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*
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* Initializes a comedi subdevice as a DIO subdevice driving an 8255 chip.
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*
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* If the optional I/O call-back function is provided, its prototype is of
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* the following form:
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*
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* int my_8255_callback(struct comedi_device *dev, int dir, int port,
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* int data, unsigned long regbase);
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*
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* where 'dev', and 'regbase' match the values passed to this function,
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* 'port' is the 8255 port number 0 to 3 (including the control port), 'dir'
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* is the direction (0 for read, 1 for write) and 'data' is the value to be
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* written. It should return 0 if writing or the value read if reading.
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*
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* If the optional I/O call-back function is not provided, an internal
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* call-back function is used which uses consecutive I/O port addresses
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* starting at dev->iobase + regbase.
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*
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* Return: -ENOMEM if failed to allocate memory, zero on success.
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*/
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int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
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int (*io)(struct comedi_device *dev, int dir, int port,
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int data, unsigned long regbase),
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unsigned long regbase)
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{
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return __subdev_8255_init(dev, s, io, regbase, false);
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}
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EXPORT_SYMBOL_GPL(subdev_8255_init);
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/**
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* subdev_8255_mm_init - initialize DIO subdevice for driving mmio-mapped 8255
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* @dev: comedi device owning subdevice
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* @s: comedi subdevice to initialize
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* @io: (optional) register I/O call-back function
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* @regbase: offset of 8255 registers from dev->mmio, or call-back context
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*
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* Initializes a comedi subdevice as a DIO subdevice driving an 8255 chip.
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*
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* If the optional I/O call-back function is provided, its prototype is of
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* the following form:
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*
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* int my_8255_callback(struct comedi_device *dev, int dir, int port,
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* int data, unsigned long regbase);
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*
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* where 'dev', and 'regbase' match the values passed to this function,
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* 'port' is the 8255 port number 0 to 3 (including the control port), 'dir'
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* is the direction (0 for read, 1 for write) and 'data' is the value to be
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* written. It should return 0 if writing or the value read if reading.
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*
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* If the optional I/O call-back function is not provided, an internal
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* call-back function is used which uses consecutive MMIO virtual addresses
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* starting at dev->mmio + regbase.
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*
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* Return: -ENOMEM if failed to allocate memory, zero on success.
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*/
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int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
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int (*io)(struct comedi_device *dev, int dir, int port,
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int data, unsigned long regbase),
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unsigned long regbase)
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{
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return __subdev_8255_init(dev, s, io, regbase, true);
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}
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EXPORT_SYMBOL_GPL(subdev_8255_mm_init);
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/**
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* subdev_8255_regbase - get offset of 8255 registers or call-back context
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* @s: comedi subdevice
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*
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* Returns the 'regbase' parameter that was previously passed to
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* subdev_8255_init() or subdev_8255_mm_init() to set up the subdevice.
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* Only valid if the subdevice was set up successfully.
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*/
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unsigned long subdev_8255_regbase(struct comedi_subdevice *s)
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{
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struct subdev_8255_private *spriv = s->private;
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return spriv->regbase;
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}
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EXPORT_SYMBOL_GPL(subdev_8255_regbase);
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static int __init comedi_8255_module_init(void)
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{
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return 0;
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}
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module_init(comedi_8255_module_init);
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static void __exit comedi_8255_module_exit(void)
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{
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}
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module_exit(comedi_8255_module_exit);
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MODULE_AUTHOR("Comedi https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi: Generic 8255 digital I/O support");
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MODULE_LICENSE("GPL");
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