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df0e68c1e9
Move the main COMEDI driver headers out of "drivers/comedi/" into new directory "include/linux/comedi/". These are "comedidev.h", "comedilib.h", "comedi_pci.h", "comedi_pcmcia.h", and "comedi_usb.h". Additionally, move the user-space API header "comedi.h" into "include/uapi/linux/" and add "WITH Linux-syscall-note" to its SPDX-License-Identifier. Update the "COMEDI DRIVERS" section of the MAINTAINERS file to account for these changes. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20211117120604.117740-2-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* COMEDI driver for the watchdog subdevice found on some addi-data boards
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* Copyright (c) 2013 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* Based on implementations in various addi-data COMEDI drivers.
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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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#include <linux/module.h>
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#include <linux/comedi/comedidev.h>
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#include "addi_tcw.h"
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#include "addi_watchdog.h"
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struct addi_watchdog_private {
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unsigned long iobase;
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unsigned int wdog_ctrl;
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};
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/*
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* The watchdog subdevice is configured with two INSN_CONFIG instructions:
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*
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* Enable the watchdog and set the reload timeout:
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* data[0] = INSN_CONFIG_ARM
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* data[1] = timeout reload value
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*
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* Disable the watchdog:
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* data[0] = INSN_CONFIG_DISARM
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*/
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static int addi_watchdog_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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struct addi_watchdog_private *spriv = s->private;
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unsigned int reload;
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switch (data[0]) {
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case INSN_CONFIG_ARM:
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spriv->wdog_ctrl = ADDI_TCW_CTRL_ENA;
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reload = data[1] & s->maxdata;
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outl(reload, spriv->iobase + ADDI_TCW_RELOAD_REG);
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/* Time base is 20ms, let the user know the timeout */
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dev_info(dev->class_dev, "watchdog enabled, timeout:%dms\n",
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20 * reload + 20);
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break;
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case INSN_CONFIG_DISARM:
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spriv->wdog_ctrl = 0;
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break;
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default:
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return -EINVAL;
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}
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outl(spriv->wdog_ctrl, spriv->iobase + ADDI_TCW_CTRL_REG);
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return insn->n;
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}
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static int addi_watchdog_insn_read(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 addi_watchdog_private *spriv = s->private;
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int i;
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for (i = 0; i < insn->n; i++)
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data[i] = inl(spriv->iobase + ADDI_TCW_STATUS_REG);
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return insn->n;
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}
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static int addi_watchdog_insn_write(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 addi_watchdog_private *spriv = s->private;
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int i;
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if (spriv->wdog_ctrl == 0) {
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dev_warn(dev->class_dev, "watchdog is disabled\n");
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return -EINVAL;
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}
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/* "ping" the watchdog */
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for (i = 0; i < insn->n; i++) {
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outl(spriv->wdog_ctrl | ADDI_TCW_CTRL_TRIG,
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spriv->iobase + ADDI_TCW_CTRL_REG);
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}
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return insn->n;
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}
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void addi_watchdog_reset(unsigned long iobase)
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{
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outl(0x0, iobase + ADDI_TCW_CTRL_REG);
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outl(0x0, iobase + ADDI_TCW_RELOAD_REG);
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}
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EXPORT_SYMBOL_GPL(addi_watchdog_reset);
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int addi_watchdog_init(struct comedi_subdevice *s, unsigned long iobase)
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{
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struct addi_watchdog_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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spriv->iobase = iobase;
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s->type = COMEDI_SUBD_TIMER;
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s->subdev_flags = SDF_WRITABLE;
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s->n_chan = 1;
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s->maxdata = 0xff;
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s->insn_config = addi_watchdog_insn_config;
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s->insn_read = addi_watchdog_insn_read;
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s->insn_write = addi_watchdog_insn_write;
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return 0;
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}
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EXPORT_SYMBOL_GPL(addi_watchdog_init);
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static int __init addi_watchdog_module_init(void)
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{
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return 0;
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}
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module_init(addi_watchdog_module_init);
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static void __exit addi_watchdog_module_exit(void)
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{
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}
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module_exit(addi_watchdog_module_exit);
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MODULE_DESCRIPTION("ADDI-DATA Watchdog subdevice");
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MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
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MODULE_LICENSE("GPL");
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