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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
ed9eccbe89
This adds the Comedi core to the staging tree. This is a data acquision infrastructure for Linux, providing a common interface for these types of drivers. Taken directly from the comedi git tree, with only minor tweaks by Greg to get it to build properly within the kernel tree. From: David Schleef <ds@schleef.org> Cc: Ian Abbott <abbotti@mev.co.uk> Cc: Shawn Bohrer <shawn.bohrer@gmail.com> Signed-off-by: Frank Mori Hess <fmhess@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
113 lines
3 KiB
C
113 lines
3 KiB
C
#define __NO_VERSION__
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/* rt_pend_tq.c */
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include "comedidev.h" // for rt spinlocks
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#include "rt_pend_tq.h"
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#ifdef CONFIG_COMEDI_RTAI
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#include <rtai.h>
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#endif
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#ifdef CONFIG_COMEDI_FUSION
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#include <nucleus/asm/hal.h>
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#endif
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#ifdef CONFIG_COMEDI_RTL
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#include <rtl_core.h>
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#endif
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#ifdef standalone
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#include <linux/module.h>
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#define rt_pend_tq_init init_module
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#define rt_pend_tq_cleanup cleanup_module
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#endif
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volatile static struct rt_pend_tq rt_pend_tq[RT_PEND_TQ_SIZE];
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volatile static struct rt_pend_tq *volatile rt_pend_head = rt_pend_tq,
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*volatile rt_pend_tail = rt_pend_tq;
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int rt_pend_tq_irq = 0;
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spinlock_t rt_pend_tq_lock = SPIN_LOCK_UNLOCKED;
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// WARNING: following code not checked against race conditions yet.
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#define INC_CIRCULAR_PTR(ptr,begin,size) do {if(++(ptr)>=(begin)+(size)) (ptr)=(begin); } while(0)
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#define DEC_CIRCULAR_PTR(ptr,begin,size) do {if(--(ptr)<(begin)) (ptr)=(begin)+(size)-1; } while(0)
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int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1, void *arg2)
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{
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unsigned long flags;
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if (func == NULL)
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return -EINVAL;
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if (rt_pend_tq_irq <= 0)
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return -ENODEV;
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comedi_spin_lock_irqsave(&rt_pend_tq_lock, flags);
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INC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
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if (rt_pend_head == rt_pend_tail) {
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// overflow, we just refuse to take this request
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DEC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
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comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
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return -EAGAIN;
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}
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rt_pend_head->func = func;
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rt_pend_head->arg1 = arg1;
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rt_pend_head->arg2 = arg2;
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comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
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#ifdef CONFIG_COMEDI_RTAI
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rt_pend_linux_srq(rt_pend_tq_irq);
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#endif
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#ifdef CONFIG_COMEDI_FUSION
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rthal_apc_schedule(rt_pend_tq_irq);
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#endif
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#ifdef CONFIG_COMEDI_RTL
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rtl_global_pend_irq(rt_pend_tq_irq);
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#endif
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return 0;
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}
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#ifdef CONFIG_COMEDI_RTAI
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void rt_pend_irq_handler(void)
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#elif defined(CONFIG_COMEDI_FUSION)
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void rt_pend_irq_handler(void *cookie)
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#elif defined(CONFIG_COMEDI_RTL)
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void rt_pend_irq_handler(int irq, void *dev PT_REGS_ARG)
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#endif
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{
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while (rt_pend_head != rt_pend_tail) {
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INC_CIRCULAR_PTR(rt_pend_tail, rt_pend_tq, RT_PEND_TQ_SIZE);
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rt_pend_tail->func(rt_pend_tail->arg1, rt_pend_tail->arg2);
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}
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}
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int rt_pend_tq_init(void)
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{
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rt_pend_head = rt_pend_tail = rt_pend_tq;
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#ifdef CONFIG_COMEDI_RTAI
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rt_pend_tq_irq = rt_request_srq(0, rt_pend_irq_handler, NULL);
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#endif
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#ifdef CONFIG_COMEDI_FUSION
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rt_pend_tq_irq =
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rthal_apc_alloc("comedi APC", rt_pend_irq_handler, NULL);
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#endif
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#ifdef CONFIG_COMEDI_RTL
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rt_pend_tq_irq = rtl_get_soft_irq(rt_pend_irq_handler, "rt_pend_irq");
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#endif
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if (rt_pend_tq_irq > 0)
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printk("rt_pend_tq: RT bottom half scheduler initialized OK\n");
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else
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printk("rt_pend_tq: rtl_get_soft_irq failed\n");
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return 0;
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}
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void rt_pend_tq_cleanup(void)
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{
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printk("rt_pend_tq: unloading\n");
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#ifdef CONFIG_COMEDI_RTAI
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rt_free_srq(rt_pend_tq_irq);
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#endif
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#ifdef CONFIG_COMEDI_FUSION
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rthal_apc_free(rt_pend_tq_irq);
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#endif
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#ifdef CONFIG_COMEDI_RTL
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free_irq(rt_pend_tq_irq, NULL);
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#endif
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}
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