Staging: comedi: remove RT code

This removes the unused RT code from the comedi subsystem.

A lot of drivers needed to then include interrupt.h on their own, as they
were picking it up through the comedi_rt.h inclusion.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/Kconfig

@@ -13,13 +13,6 @@ config COMEDI_DEBUG
 	  This is an option for use by developers; most people should
 	  say N here. This enables comedi core and driver debugging.
 
-config COMEDI_RT
-	tristate "Comedi Real-time support"
-	depends on COMEDI && RT
-	default N
-	---help---
-	  Enable Real time support for the Comedi core.
-
 config COMEDI_PCI_DRIVERS
 	tristate "Comedi PCI drivers"
 	depends on COMEDI && PCI

drivers/staging/comedi/Makefile

 obj-$(CONFIG_COMEDI) += comedi.o
-obj-$(CONFIG_COMEDI_RT) += comedi_rt.o
 
 obj-$(CONFIG_COMEDI)	+= kcomedilib/
 obj-$(CONFIG_COMEDI)	+= drivers/
@@ -11,7 +10,3 @@ comedi-objs :=		\
 	drivers.o	\
 	comedi_compat32.o \
 	comedi_ksyms.o	\
-
-comedi_rt-objs :=	\
-	rt_pend_tq.o	\
-	rt.o

drivers/staging/comedi/comedi_fops.c

@@ -1079,13 +1079,6 @@ static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file)
 
 	comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
 
-#ifdef CONFIG_COMEDI_RT
-	if (async->cmd.flags & TRIG_RT) {
-		if (comedi_switch_to_rt(dev) == 0)
-			comedi_set_subdevice_runflags(s, SRF_RT, SRF_RT);
-	}
-#endif
-
 	ret = s->do_cmd(dev, s);
 	if (ret == 0)
 		return 0;
@@ -1720,12 +1713,6 @@ void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
 	struct comedi_async *async = s->async;
 
 	comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
-#ifdef CONFIG_COMEDI_RT
-	if (comedi_get_subdevice_runflags(s) & SRF_RT) {
-		comedi_switch_to_non_rt(dev);
-		comedi_set_subdevice_runflags(s, SRF_RT, 0);
-	}
-#endif
 	if (async) {
 		comedi_reset_async_buf(async);
 		async->inttrig = NULL;
@@ -1952,8 +1939,6 @@ static int __init comedi_init(void)
 		}
 	}
 
-	comedi_rt_init();
-
 	comedi_register_ioctl32();
 
 	return 0;
@@ -1974,8 +1959,6 @@ static void __exit comedi_cleanup(void)
 
 	comedi_proc_cleanup();
 
-	comedi_rt_cleanup();
-
 	comedi_unregister_ioctl32();
 }
 
@@ -2015,15 +1998,8 @@ void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
 
 	if (async->cb_mask & s->async->events) {
 		if (comedi_get_subdevice_runflags(s) & SRF_USER) {
-
 			if (dev->rt) {
-#ifdef CONFIG_COMEDI_RT
-				/* pend wake up */
-				comedi_rt_pend_wakeup(&async->wait_head);
-#else
-				printk
-				    ("BUG: comedi_event() code unreachable\n");
-#endif
+				printk("BUG: comedi_event() code unreachable\n");
 			} else {
 				wake_up_interruptible(&async->wait_head);
 				if (s->subdev_flags & SDF_CMD_READ) {

drivers/staging/comedi/comedi_ksyms.c

@@ -46,13 +46,6 @@ EXPORT_SYMBOL(range_bipolar2_5);
 EXPORT_SYMBOL(range_unipolar10);
 EXPORT_SYMBOL(range_unipolar5);
 EXPORT_SYMBOL(range_unknown);
-#ifdef CONFIG_COMEDI_RT
-EXPORT_SYMBOL(comedi_free_irq);
-EXPORT_SYMBOL(comedi_request_irq);
-EXPORT_SYMBOL(comedi_switch_to_rt);
-EXPORT_SYMBOL(comedi_switch_to_non_rt);
-EXPORT_SYMBOL(rt_pend_call);
-#endif
 #ifdef CONFIG_COMEDI_DEBUG
 EXPORT_SYMBOL(comedi_debug);
 #endif

drivers/staging/comedi/comedi_rt.h

-/*
-    module/comedi_rt.h
-    header file for real-time structures, variables, and constants
-
-    COMEDI - Linux Control and Measurement Device Interface
-    Copyright (C) 1997-2000 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.
-
-*/
-
-#ifndef _COMEDI_RT_H
-#define _COMEDI_RT_H
-
-#ifndef _COMEDIDEV_H
-#error comedi_rt.h should only be included by comedidev.h
-#endif
-
-#include <linux/kdev_t.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-
-#ifdef CONFIG_COMEDI_RT
-
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#include <rtai_sched.h>
-#include <rtai_version.h>
-#endif
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl_core.h>
-#include <rtl_time.h>
-/* #ifdef RTLINUX_VERSION_CODE */
-#include <rtl_sync.h>
-/* #endif */
-#define rt_printk rtl_printf
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-#define rt_printk(format, args...) printk(format , ## args)
-#endif /* CONFIG_COMEDI_FUSION */
-#ifdef CONFIG_PRIORITY_IRQ
-#define rt_printk printk
-#endif
-
-int comedi_request_irq(unsigned int irq, irq_handler_t handler,
-		unsigned long flags, const char *device,
-		struct comedi_device *dev_id);
-void comedi_free_irq(unsigned int irq, struct comedi_device *dev_id);
-void comedi_rt_init(void);
-void comedi_rt_cleanup(void);
-int comedi_switch_to_rt(struct comedi_device *dev);
-void comedi_switch_to_non_rt(struct comedi_device *dev);
-void comedi_rt_pend_wakeup(wait_queue_head_t *q);
-extern int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1,
-	void *arg2);
-
-#else
-
-#define comedi_request_irq(a, b, c, d, e) request_irq(a, b, c, d, e)
-#define comedi_free_irq(a, b) free_irq(a, b)
-#define comedi_rt_init() do {} while (0)
-#define comedi_rt_cleanup() do {} while (0)
-#define comedi_switch_to_rt(a) (-1)
-#define comedi_switch_to_non_rt(a) do {} while (0)
-#define comedi_rt_pend_wakeup(a) do {} while (0)
-
-#define rt_printk(format, args...)	printk(format, ##args)
-
-#endif
-
-/* Define a spin_lock_irqsave function that will work with rt or without.
- * Use inline functions instead of just macros to enforce some type checking.
- */
-#define comedi_spin_lock_irqsave(lock_ptr, flags) \
-	(flags = __comedi_spin_lock_irqsave(lock_ptr))
-
-static inline unsigned long __comedi_spin_lock_irqsave(spinlock_t *lock_ptr)
-{
-	unsigned long flags;
-
-#if defined(CONFIG_COMEDI_RTAI)
-	flags = rt_spin_lock_irqsave(lock_ptr);
-
-#elif defined(CONFIG_COMEDI_RTL)
-	rtl_spin_lock_irqsave(lock_ptr, flags);
-
-#elif defined(CONFIG_COMEDI_RTL_V1)
-	rtl_spin_lock_irqsave(lock_ptr, flags);
-
-#elif defined(CONFIG_COMEDI_FUSION)
-	rthal_spin_lock_irqsave(lock_ptr, flags);
-#else
-	spin_lock_irqsave(lock_ptr, flags);
-
-#endif
-
-	return flags;
-}
-
-static inline void comedi_spin_unlock_irqrestore(spinlock_t *lock_ptr,
-	unsigned long flags)
-{
-
-#if defined(CONFIG_COMEDI_RTAI)
-	rt_spin_unlock_irqrestore(flags, lock_ptr);
-
-#elif defined(CONFIG_COMEDI_RTL)
-	rtl_spin_unlock_irqrestore(lock_ptr, flags);
-
-#elif defined(CONFIG_COMEDI_RTL_V1)
-	rtl_spin_unlock_irqrestore(lock_ptr, flags);
-#elif defined(CONFIG_COMEDI_FUSION)
-	rthal_spin_unlock_irqrestore(lock_ptr, flags);
-#else
-	spin_unlock_irqrestore(lock_ptr, flags);
-
-#endif
-
-}
-
-/* define a RT safe udelay */
-static inline void comedi_udelay(unsigned int usec)
-{
-#if defined(CONFIG_COMEDI_RTAI)
-	static const int nanosec_per_usec = 1000;
-	rt_busy_sleep(usec * nanosec_per_usec);
-#elif defined(CONFIG_COMEDI_RTL)
-	static const int nanosec_per_usec = 1000;
-	rtl_delay(usec * nanosec_per_usec);
-#else
-	udelay(usec);
-#endif
-}
-
-#endif

drivers/staging/comedi/comedidev.h

@@ -523,8 +523,6 @@ struct usb_device;	/* forward declaration */
 int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name);
 void comedi_usb_auto_unconfig(struct usb_device *usbdev);
 
-#include "comedi_rt.h"
-
 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 	#define CONFIG_COMEDI_PCI
 #endif

drivers/staging/comedi/drivers/cb_das16_cs.c

@@ -31,6 +31,7 @@ Status: experimental
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/delay.h>
 #include <linux/pci.h>

drivers/staging/comedi/drivers/cb_pcimdas.c

@@ -43,6 +43,7 @@ See http://www.measurementcomputing.com/PDFManuals/pcim-das1602_16.pdf for more
 #include "../comedidev.h"
 
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 
 #include "comedi_pci.h"
 #include "plx9052.h"

drivers/staging/comedi/drivers/daqboard2000.c

@@ -119,6 +119,7 @@ Configuration options:
 #include "../comedidev.h"
 
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 
 #include "comedi_pci.h"
 #include "8255.h"

drivers/staging/comedi/drivers/das16.c

@@ -79,6 +79,7 @@ Computer boards manuals also available from their website www.measurementcomputi
 */
 
 #include <linux/pci.h>
+#include <linux/interrupt.h>
 #include <asm/dma.h>
 #include "../comedidev.h"
 

drivers/staging/comedi/drivers/das16m1.c

@@ -59,6 +59,7 @@ irq can be omitted, although the cmd interface will not work without it.
 */
 
 #include <linux/ioport.h>
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "8255.h"

drivers/staging/comedi/drivers/das1800.c

@@ -100,6 +100,7 @@ Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
 	read insn for analog out
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/das6402.c

@@ -38,6 +38,7 @@ Devices: [Keithley Metrabyte] DAS6402 (das6402)
 This driver has suffered bitrot.
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/das800.c

@@ -62,6 +62,7 @@ cmd triggers supported:
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/dmm32at.c

@@ -74,6 +74,7 @@ Configuration Options:
  * options that are used with comedi_config.
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/ioport.h>
 

drivers/staging/comedi/drivers/dt2811.c

@@ -45,6 +45,7 @@ Configuration options:
   [4] - D/A 1 range (same choices)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/dt2814.c

@@ -39,6 +39,7 @@ a power of 10, from 1 to 10^7, of which only 3 or 4 are useful.  In
 addition, the clock does not seem to be very accurate.
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/dt3000.c

@@ -59,6 +59,7 @@ AO commands are not supported.
 
 #define DEBUG 1
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/delay.h>
 

drivers/staging/comedi/drivers/gsc_hpdi.c

@@ -45,6 +45,7 @@ support could be added to this driver.
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/delay.h>
 

drivers/staging/comedi/drivers/icp_multi.c

@@ -50,6 +50,7 @@ There are 4 x 12-bit Analogue Outputs.  Ranges : 5V, 10V, +/-5V, +/-10V
  [1] - PCI slot number
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>

drivers/staging/comedi/drivers/me4000.c

@@ -51,6 +51,7 @@ broken.
 
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>

drivers/staging/comedi/drivers/me_daq.c

@@ -50,6 +50,7 @@ from http://www.comedi.org
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "comedi_pci.h"

drivers/staging/comedi/drivers/multiq3.c

@@ -29,6 +29,7 @@ Devices: [Quanser Consulting] MultiQ-3 (multiq3)
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/ni_6527.c

@@ -41,6 +41,7 @@ Updated: Sat, 25 Jan 2003 13:24:40 -0800
 #define DEBUG 1
 #define DEBUG_FLAGS
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"

drivers/staging/comedi/drivers/ni_65xx.c

@@ -50,6 +50,7 @@ except maybe the 6514.
 #define _GNU_SOURCE
 #define DEBUG 1
 #define DEBUG_FLAGS
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"

drivers/staging/comedi/drivers/ni_660x.c

@@ -40,6 +40,7 @@ DAQ 6601/6602 User Manual (NI 322137B-01)
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include "mite.h"
 #include "ni_tio.h"

drivers/staging/comedi/drivers/ni_670x.c

@@ -41,6 +41,7 @@ Commands are not supported.
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"

drivers/staging/comedi/drivers/ni_at_a2150.c

@@ -64,6 +64,7 @@ TRIG_WAKE_EOS
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/ni_atmio.c

@@ -93,6 +93,7 @@ are not supported.
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>

drivers/staging/comedi/drivers/ni_atmio16d.c

@@ -35,6 +35,7 @@ Devices: [National Instruments] AT-MIO-16 (atmio16), AT-MIO-16D (atmio16d)
  *
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/ni_daq_700.c

@@ -41,6 +41,7 @@ emu as port A output, port B input, port C N/A).
 IRQ is assigned but not used.
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/ni_daq_dio24.c

@@ -40,6 +40,7 @@ the PCMCIA interface.
 /* #define LABPC_DEBUG */   /*  enable debugging messages */
 #undef LABPC_DEBUG
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/ni_labpc.c

@@ -76,6 +76,7 @@ NI manuals:
 #undef LABPC_DEBUG
 /* #define LABPC_DEBUG    enable debugging messages */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>

drivers/staging/comedi/drivers/ni_mio_common.c

@@ -61,6 +61,7 @@
 /* #define DEBUG_STATUS_A */
 /* #define DEBUG_STATUS_B */
 
+#include <linux/interrupt.h>
 #include "8255.h"
 #include "mite.h"
 #include "comedi_fc.h"

drivers/staging/comedi/drivers/ni_pcidio.c

@@ -69,6 +69,7 @@ comedi_nonfree_firmware tarball available from http://www.comedi.org
 /* #define DEBUG 1 */
 /* #define DEBUG_FLAGS */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"

drivers/staging/comedi/drivers/pcl711.c

@@ -58,6 +58,7 @@ supported.
 
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/pcl812.c

@@ -107,6 +107,7 @@ Options for ACL-8113, ISO-813:
         3= 20V unipolar inputs
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>

drivers/staging/comedi/drivers/pcmad.c

@@ -41,6 +41,7 @@ Configuration options:
           1 = two's complement
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/pcmmio.c

@@ -73,6 +73,7 @@ Configuration Options:
   [1] - IRQ (optional -- for edge-detect interrupt support only, leave out if you don't need this feature)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/pci.h>		/* for PCI devices */
 

drivers/staging/comedi/drivers/pcmuio.c

@@ -75,6 +75,7 @@ Configuration Options:
   [2] - IRQ for second ASIC (pcmuio96 only - IRQ for chans 48-72 .. can be the same as first irq!)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/pci.h>		/* for PCI devices */

drivers/staging/comedi/drivers/rtd520.c

@@ -101,6 +101,7 @@ Configuration options:
 
 */
 
+#include <linux/interrupt.h>
 #include <linux/delay.h>
 
 #include "../comedidev.h"

drivers/staging/comedi/drivers/rti800.c

@@ -52,6 +52,7 @@ Configuration options:
   [8] - DAC 1 encoding (same as DAC 0)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>

drivers/staging/comedi/drivers/s626.c

@@ -68,6 +68,7 @@ INSN_CONFIG instructions:
    comedi_do_insn(cf,&insn); //executing configuration
 */
 
+#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 

drivers/staging/comedi/kcomedilib/kcomedilib_main.c

@@ -150,10 +150,6 @@ int comedi_command(void *d, struct comedi_cmd *cmd)
 
 	runflags = SRF_RUNNING;
 
-#ifdef CONFIG_COMEDI_RT
-	if (comedi_switch_to_rt(dev) == 0)
-		runflags |= SRF_RT;
-#endif
 	comedi_set_subdevice_runflags(s, ~0, runflags);
 
 	comedi_reset_async_buf(async);
@@ -449,11 +445,6 @@ int comedi_cancel(void *d, unsigned int subdevice)
 	if (ret)
 		return ret;
 
-#ifdef CONFIG_COMEDI_RT
-	if (comedi_get_subdevice_runflags(s) & SRF_RT)
-		comedi_switch_to_non_rt(dev);
-
-#endif
 	comedi_set_subdevice_runflags(s, SRF_RUNNING | SRF_RT, 0);
 	s->async->inttrig = NULL;
 	s->busy = NULL;

drivers/staging/comedi/rt.c

-/*
-    comedi/rt.c
-    comedi kernel module
-
-    COMEDI - Linux Control and Measurement Device Interface
-    Copyright (C) 1997-2000 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.
-
-*/
-
-#undef DEBUG
-
-#define __NO_VERSION__
-#include <linux/comedidev.h>
-
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/fcntl.h>
-#include <linux/delay.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <asm/io.h>
-
-#include "rt_pend_tq.h"
-
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#endif
-
-#ifdef CONFIG_COMEDI_FUSION
-#include <nucleus/asm/hal.h>
-#endif
-
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl_core.h>
-#include <rtl_sync.h>
-#endif
-
-struct comedi_irq_struct {
-	int rt;
-	int irq;
-	irq_handler_t handler;
-	unsigned long flags;
-	const char *device;
-	struct comedi_device *dev_id;
-};
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it);
-static int comedi_rt_release_irq(struct comedi_irq_struct *it);
-
-static struct comedi_irq_struct *comedi_irqs[NR_IRQS];
-
-int comedi_request_irq(unsigned irq, irq_handler_t handler, unsigned long flags,
-		const char *device, struct comedi_device *dev_id)
-{
-	struct comedi_irq_struct *it;
-	int ret;
-	/* null shared interrupt flag, since rt interrupt handlers do not
-	 * support it, and this version of comedi_request_irq() is only
-	 * called for kernels with rt support */
-	unsigned long unshared_flags = flags & ~IRQF_SHARED;
-
-	ret = request_irq(irq, handler, unshared_flags, device, dev_id);
-	if (ret < 0) {
-		/*  we failed, so fall back on allowing shared interrupt (which we won't ever make RT) */
-		if (flags & IRQF_SHARED) {
-			rt_printk
-				("comedi: cannot get unshared interrupt, will not use RT interrupts.\n");
-			ret = request_irq(irq, handler, flags, device, dev_id);
-		}
-		if (ret < 0)
-			return ret;
-
-	} else {
-		it = kzalloc(sizeof(struct comedi_irq_struct), GFP_KERNEL);
-		if (!it)
-			return -ENOMEM;
-
-		it->handler = handler;
-		it->irq = irq;
-		it->dev_id = dev_id;
-		it->device = device;
-		it->flags = unshared_flags;
-		comedi_irqs[irq] = it;
-	}
-	return 0;
-}
-
-void comedi_free_irq(unsigned int irq, struct comedi_device *dev_id)
-{
-	struct comedi_irq_struct *it;
-
-	free_irq(irq, dev_id);
-
-	it = comedi_irqs[irq];
-	if (it == NULL)
-		return;
-
-	if (it->rt) {
-		printk("real-time IRQ allocated at board removal (ignore)\n");
-		comedi_rt_release_irq(it);
-	}
-
-	kfree(it);
-	comedi_irqs[irq] = NULL;
-}
-
-int comedi_switch_to_rt(struct comedi_device *dev)
-{
-	struct comedi_irq_struct *it;
-	unsigned long flags;
-
-	it = comedi_irqs[dev->irq];
-	/* drivers might not be using an interrupt for commands,
-	   or we might not have been able to get an unshared irq */
-	if (it == NULL)
-		return -1;
-
-	comedi_spin_lock_irqsave(&dev->spinlock, flags);
-
-	if (!dev->rt)
-		comedi_rt_get_irq(it);
-
-	dev->rt++;
-	it->rt = 1;
-
-	comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
-
-	return 0;
-}
-
-void comedi_switch_to_non_rt(struct comedi_device *dev)
-{
-	struct comedi_irq_struct *it;
-	unsigned long flags;
-
-	it = comedi_irqs[dev->irq];
-	if (it == NULL)
-		return;
-
-	comedi_spin_lock_irqsave(&dev->spinlock, flags);
-
-	dev->rt--;
-	if (!dev->rt)
-		comedi_rt_release_irq(it);
-
-	it->rt = 0;
-
-	comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
-}
-
-void wake_up_int_handler(int arg1, void *arg2)
-{
-	wake_up_interruptible((wait_queue_head_t *) arg2);
-}
-
-void comedi_rt_pend_wakeup(wait_queue_head_t *q)
-{
-	rt_pend_call(wake_up_int_handler, 0, q);
-}
-
-/* RTAI section */
-#ifdef CONFIG_COMEDI_RTAI
-
-#ifndef HAVE_RT_REQUEST_IRQ_WITH_ARG
-#define DECLARE_VOID_IRQ(irq) \
-static void handle_void_irq_ ## irq (void){ handle_void_irq(irq); }
-
-static void handle_void_irq(int irq)
-{
-	struct comedi_irq_struct *it;
-
-	it = comedi_irqs[irq];
-	if (it == NULL) {
-		rt_printk("comedi: null irq struct?\n");
-		return;
-	}
-	it->handler(irq, it->dev_id);
-	rt_enable_irq(irq);	/* needed by rtai-adeos, seems like it shouldn't hurt earlier versions */
-}
-
-DECLARE_VOID_IRQ(0);
-DECLARE_VOID_IRQ(1);
-DECLARE_VOID_IRQ(2);
-DECLARE_VOID_IRQ(3);
-DECLARE_VOID_IRQ(4);
-DECLARE_VOID_IRQ(5);
-DECLARE_VOID_IRQ(6);
-DECLARE_VOID_IRQ(7);
-DECLARE_VOID_IRQ(8);
-DECLARE_VOID_IRQ(9);
-DECLARE_VOID_IRQ(10);
-DECLARE_VOID_IRQ(11);
-DECLARE_VOID_IRQ(12);
-DECLARE_VOID_IRQ(13);
-DECLARE_VOID_IRQ(14);
-DECLARE_VOID_IRQ(15);
-DECLARE_VOID_IRQ(16);
-DECLARE_VOID_IRQ(17);
-DECLARE_VOID_IRQ(18);
-DECLARE_VOID_IRQ(19);
-DECLARE_VOID_IRQ(20);
-DECLARE_VOID_IRQ(21);
-DECLARE_VOID_IRQ(22);
-DECLARE_VOID_IRQ(23);
-
-static void handle_void_irq_ptrs[] = {
-	handle_void_irq_0,
-	handle_void_irq_1,
-	handle_void_irq_2,
-	handle_void_irq_3,
-	handle_void_irq_4,
-	handle_void_irq_5,
-	handle_void_irq_6,
-	handle_void_irq_7,
-	handle_void_irq_8,
-	handle_void_irq_9,
-	handle_void_irq_10,
-	handle_void_irq_11,
-	handle_void_irq_12,
-	handle_void_irq_13,
-	handle_void_irq_14,
-	handle_void_irq_15,
-	handle_void_irq_16,
-	handle_void_irq_17,
-	handle_void_irq_18,
-	handle_void_irq_19,
-	handle_void_irq_20,
-	handle_void_irq_21,
-	handle_void_irq_22,
-	handle_void_irq_23,
-};
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	rt_request_global_irq(it->irq, handle_void_irq_ptrs[it->irq]);
-	rt_startup_irq(it->irq);
-
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rt_shutdown_irq(it->irq);
-	rt_free_global_irq(it->irq);
-	return 0;
-}
-#else
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	int ret;
-
-	ret = rt_request_global_irq_arg(it->irq, it->handler, it->flags,
-		it->device, it->dev_id);
-	if (ret < 0) {
-		rt_printk("rt_request_global_irq_arg() returned %d\n", ret);
-		return ret;
-	}
-	rt_startup_irq(it->irq);
-
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rt_shutdown_irq(it->irq);
-	rt_free_global_irq(it->irq);
-	return 0;
-}
-#endif
-
-void comedi_rt_init(void)
-{
-	rt_mount_rtai();
-	rt_pend_tq_init();
-}
-
-void comedi_rt_cleanup(void)
-{
-	rt_umount_rtai();
-	rt_pend_tq_cleanup();
-}
-
-#endif
-
-/* Fusion section */
-#ifdef CONFIG_COMEDI_FUSION
-
-static void fusion_handle_irq(unsigned int irq, void *cookie)
-{
-	struct comedi_irq_struct *it = cookie;
-
-	it->handler(irq, it->dev_id);
-	rthal_irq_enable(irq);
-}
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	rthal_irq_request(it->irq, fusion_handle_irq, it);
-	rthal_irq_enable(it->irq);
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rthal_irq_disable(it->irq);
-	rthal_irq_release(it->irq);
-	return 0;
-}
-
-void comedi_rt_init(void)
-{
-	rt_pend_tq_init();
-}
-
-void comedi_rt_cleanup(void)
-{
-	rt_pend_tq_cleanup();
-}
-
-#endif /*CONFIG_COMEDI_FUSION */
-
-/* RTLinux section */
-#ifdef CONFIG_COMEDI_RTL
-
-static unsigned int handle_rtl_irq(unsigned int irq)
-{
-	struct comedi_irq_struct *it;
-
-	it = comedi_irqs[irq];
-	if (it == NULL)
-		return 0;
-	it->handler(irq, it->dev_id);
-	rtl_hard_enable_irq(irq);
-	return 0;
-}
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	rtl_request_global_irq(it->irq, handle_rtl_irq);
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rtl_free_global_irq(it->irq);
-	return 0;
-}
-
-void comedi_rt_init(void)
-{
-	rt_pend_tq_init();
-}
-
-void comedi_rt_cleanup(void)
-{
-	rt_pend_tq_cleanup();
-}
-
-#endif
-
-#ifdef CONFIG_COMEDI_PIRQ
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	int ret;
-
-	free_irq(it->irq, it->dev_id);
-	ret = request_irq(it->irq, it->handler, it->flags | SA_PRIORITY,
-		it->device, it->dev_id);
-
-	return ret;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	int ret;
-
-	free_irq(it->irq, it->dev_id);
-	ret = request_irq(it->irq, it->handler, it->flags,
-		it->device, it->dev_id);
-
-	return ret;
-}
-
-void comedi_rt_init(void)
-{
-	/* rt_pend_tq_init(); */
-}
-
-void comedi_rt_cleanup(void)
-{
-	/* rt_pend_tq_cleanup(); */
-}
-#endif

drivers/staging/comedi/rt_pend_tq.c

-#define __NO_VERSION__
-/* rt_pend_tq.c */
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include "comedidev.h"	/* for rt spinlocks */
-#include "rt_pend_tq.h"
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-#include <nucleus/asm/hal.h>
-#endif
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl_core.h>
-#endif
-
-#ifdef standalone
-#include <linux/module.h>
-#define rt_pend_tq_init init_module
-#define rt_pend_tq_cleanup cleanup_module
-#endif
-
-volatile static struct rt_pend_tq rt_pend_tq[RT_PEND_TQ_SIZE];
-volatile static struct rt_pend_tq *volatile rt_pend_head = rt_pend_tq,
-	*volatile rt_pend_tail = rt_pend_tq;
-int rt_pend_tq_irq = 0;
-DEFINE_SPINLOCK(rt_pend_tq_lock);
-
-/* WARNING: following code not checked against race conditions yet. */
-#define INC_CIRCULAR_PTR (ptr, begin, size) do {if (++ (ptr)>= (begin)+ (size)) (ptr)= (begin); } while (0)
-#define DEC_CIRCULAR_PTR (ptr, begin, size) do {if (-- (ptr)< (begin)) (ptr)= (begin)+ (size)-1; } while (0)
-
-int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1, void *arg2)
-{
-	unsigned long flags;
-
-	if (func == NULL)
-		return -EINVAL;
-	if (rt_pend_tq_irq <= 0)
-		return -ENODEV;
-	comedi_spin_lock_irqsave(&rt_pend_tq_lock, flags);
-	INC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
-	if (rt_pend_head == rt_pend_tail) {
-		/* overflow, we just refuse to take this request */
-		DEC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
-		comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
-		return -EAGAIN;
-	}
-	rt_pend_head->func = func;
-	rt_pend_head->arg1 = arg1;
-	rt_pend_head->arg2 = arg2;
-	comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
-#ifdef CONFIG_COMEDI_RTAI
-	rt_pend_linux_srq(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-	rthal_apc_schedule(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_RTL
-	rtl_global_pend_irq(rt_pend_tq_irq);
-
-#endif
-	return 0;
-}
-
-#ifdef CONFIG_COMEDI_RTAI
-void rt_pend_irq_handler(void)
-#elif defined(CONFIG_COMEDI_FUSION)
-void rt_pend_irq_handler(void *cookie)
-#elif defined(CONFIG_COMEDI_RTL)
-void rt_pend_irq_handler(int irq, void *dev)
-#endif
-{
-	while (rt_pend_head != rt_pend_tail) {
-		INC_CIRCULAR_PTR(rt_pend_tail, rt_pend_tq, RT_PEND_TQ_SIZE);
-		rt_pend_tail->func(rt_pend_tail->arg1, rt_pend_tail->arg2);
-	}
-}
-
-int rt_pend_tq_init(void)
-{
-	rt_pend_head = rt_pend_tail = rt_pend_tq;
-#ifdef CONFIG_COMEDI_RTAI
-	rt_pend_tq_irq = rt_request_srq(0, rt_pend_irq_handler, NULL);
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-	rt_pend_tq_irq =
-		rthal_apc_alloc("comedi APC", rt_pend_irq_handler, NULL);
-#endif
-#ifdef CONFIG_COMEDI_RTL
-	rt_pend_tq_irq = rtl_get_soft_irq(rt_pend_irq_handler, "rt_pend_irq");
-#endif
-	if (rt_pend_tq_irq > 0)
-		printk("rt_pend_tq: RT bottom half scheduler initialized OK\n");
-	else
-		printk("rt_pend_tq: rtl_get_soft_irq failed\n");
-	return 0;
-}
-
-void rt_pend_tq_cleanup(void)
-{
-	printk("rt_pend_tq: unloading\n");
-#ifdef CONFIG_COMEDI_RTAI
-	rt_free_srq(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-	rthal_apc_free(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_RTL
-	free_irq(rt_pend_tq_irq, NULL);
-#endif
-}

drivers/staging/comedi/rt_pend_tq.h

-#define RT_PEND_TQ_SIZE 16
-struct rt_pend_tq {
-	void (*func) (int arg1, void *arg2);
-	int arg1;
-	void *arg2;
-};
-extern int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1,
-	void *arg2);
-extern int rt_pend_tq_init(void);
-extern void rt_pend_tq_cleanup(void);