---

yaml
---
r: 354069
b: refs/heads/master
c: 2abcf87
h: refs/heads/master
i:
  354067: 79e73f9
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7828f09660947ea7c15c4f02475d7789755939bc
+refs/heads/master: 2abcf87aeea500d28a953d4b02450f76820f899d

trunk/drivers/staging/comedi/Kconfig

@@ -567,6 +567,13 @@ config COMEDI_8255_PCI
 	  To compile this driver as a module, choose M here: the module will
 	  be called 8255_pci.
 
+config COMEDI_ADDI_WATCHDOG
+	tristate
+	---help---
+	  Provides support for the watchdog subdevice found on many ADDI-DATA
+	  boards. This module will be automatically selected when needed. The
+	  module will be called addi_watchdog.
+
 config COMEDI_ADDI_APCI_035
 	tristate "ADDI-DATA APCI_035 support"
 	---help---

trunk/drivers/staging/comedi/drivers/Makefile

@@ -55,6 +55,7 @@ obj-$(CONFIG_COMEDI_POC)		+= poc.o
 
 # Comedi PCI drivers
 obj-$(CONFIG_COMEDI_8255_PCI)		+= 8255_pci.o
+obj-$(CONFIG_COMEDI_ADDI_WATCHDOG)	+= addi_watchdog.o
 obj-$(CONFIG_COMEDI_ADDI_APCI_035)	+= addi_apci_035.o
 obj-$(CONFIG_COMEDI_ADDI_APCI_1032)	+= addi_apci_1032.o
 obj-$(CONFIG_COMEDI_ADDI_APCI_1500)	+= addi_apci_1500.o

trunk/drivers/staging/comedi/drivers/addi_watchdog.c

@@ -0,0 +1,172 @@
+/*
+ * COMEDI driver for the watchdog subdevice found on some addi-data boards
+ * Copyright (c) 2013 H Hartley Sweeten <hsweeten@visionengravers.com>
+ *
+ * Based on implementations in various addi-data COMEDI drivers.
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "../comedidev.h"
+#include "addi_watchdog.h"
+
+/*
+ * Register offsets/defines for the addi-data watchdog
+ */
+#define ADDI_WDOG_REG			0x00
+#define ADDI_WDOG_RELOAD_REG		0x04
+#define ADDI_WDOG_TIMEBASE		0x08
+#define ADDI_WDOG_CTRL_REG		0x0c
+#define ADDI_WDOG_CTRL_ENABLE		(1 << 0)
+#define ADDI_WDOG_CTRL_SW_TRIG		(1 << 9)
+#define ADDI_WDOG_STATUS_REG		0x10
+#define ADDI_WDOG_STATUS_ENABLED	(1 << 0)
+#define ADDI_WDOG_STATUS_SW_TRIG	(1 << 1)
+
+struct addi_watchdog_private {
+	unsigned long iobase;
+	unsigned int wdog_ctrl;
+};
+
+/*
+ * The watchdog subdevice is configured with two INSN_CONFIG instructions:
+ *
+ * Enable the watchdog and set the reload timeout:
+ *	data[0] = INSN_CONFIG_ARM
+ *	data[1] = timeout reload value
+ *
+ * Disable the watchdog:
+ *	data[0] = INSN_CONFIG_DISARM
+ */
+static int addi_watchdog_insn_config(struct comedi_device *dev,
+				     struct comedi_subdevice *s,
+				     struct comedi_insn *insn,
+				     unsigned int *data)
+{
+	struct addi_watchdog_private *spriv = s->private;
+	unsigned int reload;
+
+	switch (data[0]) {
+	case INSN_CONFIG_ARM:
+		spriv->wdog_ctrl = ADDI_WDOG_CTRL_ENABLE;
+		reload = data[1] & s->maxdata;
+		outw(reload, spriv->iobase + ADDI_WDOG_RELOAD_REG);
+
+		/* Time base is 20ms, let the user know the timeout */
+		dev_info(dev->class_dev, "watchdog enabled, timeout:%dms\n",
+			20 * reload + 20);
+		break;
+	case INSN_CONFIG_DISARM:
+		spriv->wdog_ctrl = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	outw(spriv->wdog_ctrl, spriv->iobase + ADDI_WDOG_CTRL_REG);
+
+	return insn->n;
+}
+
+static int addi_watchdog_insn_read(struct comedi_device *dev,
+				   struct comedi_subdevice *s,
+				   struct comedi_insn *insn,
+				   unsigned int *data)
+{
+	struct addi_watchdog_private *spriv = s->private;
+	int i;
+
+	for (i = 0; i < insn->n; i++)
+		data[i] = inl(spriv->iobase + ADDI_WDOG_STATUS_REG);
+
+	return insn->n;
+}
+
+static int addi_watchdog_insn_write(struct comedi_device *dev,
+				    struct comedi_subdevice *s,
+				    struct comedi_insn *insn,
+				    unsigned int *data)
+{
+	struct addi_watchdog_private *spriv = s->private;
+	int i;
+
+	if (spriv->wdog_ctrl == 0) {
+		dev_warn(dev->class_dev, "watchdog is disabled\n");
+		return -EINVAL;
+	}
+
+	/* "ping" the watchdog */
+	for (i = 0; i < insn->n; i++) {
+		outw(spriv->wdog_ctrl | ADDI_WDOG_CTRL_SW_TRIG,
+		     spriv->iobase + ADDI_WDOG_CTRL_REG);
+	}
+
+	return insn->n;
+}
+
+void addi_watchdog_reset(unsigned long iobase)
+{
+	outl(0x0, iobase + ADDI_WDOG_CTRL_REG);
+	outl(0x0, iobase + ADDI_WDOG_RELOAD_REG);
+}
+EXPORT_SYMBOL_GPL(addi_watchdog_reset);
+
+int addi_watchdog_init(struct comedi_subdevice *s, unsigned long iobase)
+{
+	struct addi_watchdog_private *spriv;
+
+	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
+	if (!spriv)
+		return -ENOMEM;
+
+	spriv->iobase = iobase;
+
+	s->private	= spriv;
+
+	s->type		= COMEDI_SUBD_TIMER;
+	s->subdev_flags	= SDF_WRITEABLE;
+	s->n_chan	= 1;
+	s->maxdata	= 0xff;
+	s->insn_config	= addi_watchdog_insn_config;
+	s->insn_read	= addi_watchdog_insn_read;
+	s->insn_write	= addi_watchdog_insn_write;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(addi_watchdog_init);
+
+void addi_watchdog_cleanup(struct comedi_subdevice *s)
+{
+	kfree(s->private);
+}
+EXPORT_SYMBOL_GPL(addi_watchdog_cleanup);
+
+static int __init addi_watchdog_module_init(void)
+{
+	return 0;
+}
+module_init(addi_watchdog_module_init);
+
+static void __exit addi_watchdog_module_exit(void)
+{
+}
+module_exit(addi_watchdog_module_exit);
+
+MODULE_DESCRIPTION("ADDI-DATA Watchdog subdevice");
+MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
+MODULE_LICENSE("GPL");

trunk/drivers/staging/comedi/drivers/addi_watchdog.h

@@ -0,0 +1,10 @@
+#ifndef _ADDI_WATCHDOG_H
+#define _ADDI_WATCHDOG_H
+
+#include "../comedidev.h"
+
+void addi_watchdog_reset(unsigned long iobase);
+int addi_watchdog_init(struct comedi_subdevice *, unsigned long iobase);
+void addi_watchdog_cleanup(struct comedi_subdevice *s);
+
+#endif