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path: root/drivers/ptp/ptp_chardev.c
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Diffstat (limited to 'drivers/ptp/ptp_chardev.c')
-rw-r--r--drivers/ptp/ptp_chardev.c61
1 files changed, 56 insertions, 5 deletions
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index e7f301da2..34a0c60 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -21,6 +21,7 @@
#include <linux/posix-clock.h>
#include <linux/poll.h>
#include <linux/sched.h>
+#include <linux/slab.h>
#include "ptp_private.h"
@@ -33,9 +34,13 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
{
struct ptp_clock_caps caps;
struct ptp_clock_request req;
+ struct ptp_sys_offset *sysoff = NULL;
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
struct ptp_clock_info *ops = ptp->info;
+ struct ptp_clock_time *pct;
+ struct timespec ts;
int enable, err = 0;
+ unsigned int i;
switch (cmd) {
@@ -88,10 +93,45 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
err = ops->enable(ops, &req, enable);
break;
+ case PTP_SYS_OFFSET:
+ sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
+ if (!sysoff) {
+ err = -ENOMEM;
+ break;
+ }
+ if (copy_from_user(sysoff, (void __user *)arg,
+ sizeof(*sysoff))) {
+ err = -EFAULT;
+ break;
+ }
+ if (sysoff->n_samples > PTP_MAX_SAMPLES) {
+ err = -EINVAL;
+ break;
+ }
+ pct = &sysoff->ts[0];
+ for (i = 0; i < sysoff->n_samples; i++) {
+ getnstimeofday(&ts);
+ pct->sec = ts.tv_sec;
+ pct->nsec = ts.tv_nsec;
+ pct++;
+ ptp->info->gettime(ptp->info, &ts);
+ pct->sec = ts.tv_sec;
+ pct->nsec = ts.tv_nsec;
+ pct++;
+ }
+ getnstimeofday(&ts);
+ pct->sec = ts.tv_sec;
+ pct->nsec = ts.tv_nsec;
+ if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
+ err = -EFAULT;
+ break;
+
default:
err = -ENOTTY;
break;
}
+
+ kfree(sysoff);
return err;
}
@@ -104,20 +144,23 @@ unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
return queue_cnt(&ptp->tsevq) ? POLLIN : 0;
}
+#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
+
ssize_t ptp_read(struct posix_clock *pc,
uint rdflags, char __user *buf, size_t cnt)
{
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
struct timestamp_event_queue *queue = &ptp->tsevq;
- struct ptp_extts_event event[PTP_BUF_TIMESTAMPS];
+ struct ptp_extts_event *event;
unsigned long flags;
size_t qcnt, i;
+ int result;
if (cnt % sizeof(struct ptp_extts_event) != 0)
return -EINVAL;
- if (cnt > sizeof(event))
- cnt = sizeof(event);
+ if (cnt > EXTTS_BUFSIZE)
+ cnt = EXTTS_BUFSIZE;
cnt = cnt / sizeof(struct ptp_extts_event);
@@ -135,6 +178,12 @@ ssize_t ptp_read(struct posix_clock *pc,
return -ENODEV;
}
+ event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
+ if (!event) {
+ mutex_unlock(&ptp->tsevq_mux);
+ return -ENOMEM;
+ }
+
spin_lock_irqsave(&queue->lock, flags);
qcnt = queue_cnt(queue);
@@ -153,8 +202,10 @@ ssize_t ptp_read(struct posix_clock *pc,
mutex_unlock(&ptp->tsevq_mux);
+ result = cnt;
if (copy_to_user(buf, event, cnt))
- return -EFAULT;
+ result = -EFAULT;
- return cnt;
+ kfree(event);
+ return result;
}
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