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Date: Wed, 3 Feb 2010 23:56:49 +0300 From: Alexander Gordeev <lasaine@....cs.msu.su> To: linux-kernel@...r.kernel.org Cc: linuxpps@...enneenne.com, "Nikita V\. Youshchenko" <yoush@...msu.su>, stas@....cs.msu.su, Alexander Gordeev <lasaine@....cs.msu.su>, Randy Dunlap <rdunlap@...otime.net>, Mauro Carvalho Chehab <mchehab@...hat.com>, Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>, Rodolfo Giometti <giometti@...ux.it>, Andrew Morton <akpm@...ux-foundation.org>, Rodolfo Giometti <giometti@...eenne.com>, "William S\. Brasher" <billb958@...r.net>, Reg Clemens <clemens@....com>, Joonwoo Park <joonwpark81@...il.com>, Greg Kroah-Hartman <gregkh@...e.de>, Dave Jones <davej@...hat.com>, Alan Cox <alan@...rguk.ukuu.org.uk>, linux-doc@...r.kernel.org Subject: [PATCH 3/5] pps: add kernel consumer support Add an optional feature of PPSAPI, kernel consumer support, which uses the added hardpps() function. Signed-off-by: Alexander Gordeev <lasaine@....cs.msu.su> --- Documentation/ioctl/ioctl-number.txt | 2 +- drivers/pps/kapi.c | 28 ++++++++++++++ drivers/pps/pps.c | 67 +++++++++++++++++++++++++++++++++- include/linux/pps.h | 7 ++++ include/linux/pps_kernel.h | 6 +++ 5 files changed, 108 insertions(+), 2 deletions(-) diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt index 9473749..d68718b 100644 --- a/Documentation/ioctl/ioctl-number.txt +++ b/Documentation/ioctl/ioctl-number.txt @@ -152,7 +152,7 @@ Code Seq# Include File Comments 'p' 40-7F linux/nvram.h 'p' 80-9F user-space parport <mailto:tim@...erelk.net> -'p' a1-a4 linux/pps.h LinuxPPS +'p' a1-a5 linux/pps.h LinuxPPS <mailto:giometti@...ux.it> 'q' 00-1F linux/serio.h 'q' 80-FF Internet PhoneJACK, Internet LineJACK diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c index 8a77102..59ac4f5 100644 --- a/drivers/pps/kapi.c +++ b/drivers/pps/kapi.c @@ -25,6 +25,7 @@ #include <linux/init.h> #include <linux/sched.h> #include <linux/time.h> +#include <linux/timex.h> #include <linux/spinlock.h> #include <linux/idr.h> #include <linux/fs.h> @@ -37,6 +38,12 @@ DEFINE_SPINLOCK(pps_idr_lock); DEFINE_IDR(pps_idr); +/* state variables to bind kernel consumer */ +/* PPS API (RFC 2783): current source and mode for ``kernel consumer'' */ +DEFINE_SPINLOCK(pps_kc_hardpps_lock); +void *pps_kc_hardpps_dev; /* some unique pointer to device */ +int pps_kc_hardpps_mode; /* mode bits for kernel consumer */ + /* * Local functions */ @@ -272,6 +279,7 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data) struct pps_device *pps; unsigned long flags; int captured = 0; + s64 nsec = 0; if ((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0) { printk(KERN_ERR "pps: unknown event (%x) for source %d\n", @@ -304,6 +312,11 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data) /* Save the time stamp */ pps->assert_tu = ts->ts_real; + if (likely(pps->assert_tu_raw.tv_sec != 0)) { + struct timespec d = + timespec_sub(ts->ts_raw, pps->assert_tu_raw); + nsec = timespec_to_ns(&d); + } pps->assert_tu_raw = ts->ts_raw; pps->assert_sequence++; pr_debug("capture assert seq #%u for source %d\n", @@ -320,6 +333,11 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data) /* Save the time stamp */ pps->clear_tu = ts->ts_real; + if (likely(pps->clear_tu_raw.tv_sec != 0)) { + struct timespec d = + timespec_sub(ts->ts_raw, pps->clear_tu_raw); + nsec = timespec_to_ns(&d); + } pps->clear_tu_raw = ts->ts_raw; pps->clear_sequence++; pr_debug("capture clear seq #%u for source %d\n", @@ -327,6 +345,16 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data) captured = ~0; } + spin_lock(&pps_kc_hardpps_lock); + if (pps == pps_kc_hardpps_dev && event & pps_kc_hardpps_mode) { + struct timespec p_ts = { + .tv_sec = ts->ts_real.sec, + .tv_nsec = ts->ts_real.nsec + }; + + hardpps(&p_ts, nsec); + } + spin_unlock(&pps_kc_hardpps_lock); /* Wake up iif captured somthing */ if (captured) { diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c index ca5183b..22fdcfe 100644 --- a/drivers/pps/pps.c +++ b/drivers/pps/pps.c @@ -62,6 +62,8 @@ static long pps_cdev_ioctl(struct file *file, struct pps_device *pps = file->private_data; struct pps_kparams params; struct pps_fdata fdata; + struct pps_bind_args bind_args; + unsigned long irq_flags; unsigned long ticks; void __user *uarg = (void __user *) arg; int __user *iuarg = (int __user *) arg; @@ -186,9 +188,72 @@ static long pps_cdev_ioctl(struct file *file, break; + case PPS_KC_BIND: + pr_info("PPS_KC_BIND: source %d\n", pps->id); + + /* Check the capabilities */ + if (!capable(CAP_SYS_TIME)) + return -EPERM; + + if (copy_from_user(&bind_args, uarg, + sizeof(struct pps_bind_args))) + return -EFAULT; + + /* Check for supported capabilities */ + if ((bind_args.edge & ~pps->info.mode) != 0) { + pr_err("PPS_KC_BIND: " + "unsupported capabilities (%x)\n", + bind_args.edge); + return -EINVAL; + } + + /* Validate parameters roughly */ + if (bind_args.tsformat != PPS_TSFMT_TSPEC || + (bind_args.edge & ~PPS_CAPTUREBOTH) != 0 || + bind_args.consumer != PPS_KC_HARDPPS) { + pr_err("PPS_KC_BIND: " + "invalid kcbind parameters (%x)\n", + bind_args.edge); + return -EINVAL; + } + + /* Check if another consumer is already bound */ + spin_lock_irqsave(&pps_kc_hardpps_lock, irq_flags); + + if (bind_args.edge == 0) + if (pps_kc_hardpps_dev == pps) { + pps_kc_hardpps_mode = 0; + pps_kc_hardpps_dev = NULL; + spin_unlock_irqrestore(&pps_kc_hardpps_lock, + irq_flags); + pr_info("unbound kernel consumer\n"); + } else { + spin_unlock_irqrestore(&pps_kc_hardpps_lock, + irq_flags); + pr_err("selected kernel consumer" + " is not bound\n"); + return -EINVAL; + } + else + if (pps_kc_hardpps_dev == NULL || + pps_kc_hardpps_dev == pps) { + pps_kc_hardpps_mode = bind_args.edge; + pps_kc_hardpps_dev = pps; + spin_unlock_irqrestore(&pps_kc_hardpps_lock, + irq_flags); + pr_info("bound kernel consumer: dev=%p, " + "edge=0x%x\n", pps, bind_args.edge); + } else { + spin_unlock_irqrestore(&pps_kc_hardpps_lock, + irq_flags); + pr_err("another kernel consumer" + " is already bound\n"); + return -EINVAL; + } + break; + default: return -ENOTTY; - break; } return 0; diff --git a/include/linux/pps.h b/include/linux/pps.h index 0194ab0..a9bb1d9 100644 --- a/include/linux/pps.h +++ b/include/linux/pps.h @@ -114,11 +114,18 @@ struct pps_fdata { struct pps_ktime timeout; }; +struct pps_bind_args { + int tsformat; /* format of time stamps */ + int edge; /* selected event type */ + int consumer; /* selected kernel consumer */ +}; + #include <linux/ioctl.h> #define PPS_GETPARAMS _IOR('p', 0xa1, struct pps_kparams *) #define PPS_SETPARAMS _IOW('p', 0xa2, struct pps_kparams *) #define PPS_GETCAP _IOR('p', 0xa3, int *) #define PPS_FETCH _IOWR('p', 0xa4, struct pps_fdata *) +#define PPS_KC_BIND _IOW('p', 0xa5, struct pps_bind_args *) #endif /* _PPS_H_ */ diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h index 0d36a6f..1251138 100644 --- a/include/linux/pps_kernel.h +++ b/include/linux/pps_kernel.h @@ -85,6 +85,12 @@ extern struct idr pps_idr; extern struct device_attribute pps_attrs[]; +/* state variables to bind kernel consumer */ +/* PPS API (RFC 2783): current source and mode for ``kernel consumer'' */ +extern spinlock_t pps_kc_hardpps_lock; +extern void *pps_kc_hardpps_dev; /* some unique pointer to device */ +extern int pps_kc_hardpps_mode; /* mode bits for kernel consumer */ + /* * Exported functions */ -- 1.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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