* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#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>
#include <linux/pps_kernel.h>
#include <linux/slab.h>
-/*
- * Global variables
- */
-
-DEFINE_SPINLOCK(pps_idr_lock);
-DEFINE_IDR(pps_idr);
+#include "kc.h"
/*
* Local functions
* Exported functions
*/
-/* pps_get_source - find a PPS source
- * @source: the PPS source ID.
- *
- * This function is used to find an already registered PPS source into the
- * system.
- *
- * The function returns NULL if found nothing, otherwise it returns a pointer
- * to the PPS source data struct (the refcounter is incremented by 1).
- */
-
-struct pps_device *pps_get_source(int source)
-{
- struct pps_device *pps;
- unsigned long flags;
-
- spin_lock_irqsave(&pps_idr_lock, flags);
-
- pps = idr_find(&pps_idr, source);
- if (pps != NULL)
- atomic_inc(&pps->usage);
-
- spin_unlock_irqrestore(&pps_idr_lock, flags);
-
- return pps;
-}
-
-/* pps_put_source - free the PPS source data
- * @pps: a pointer to the PPS source.
- *
- * This function is used to free a PPS data struct if its refcount is 0.
- */
-
-void pps_put_source(struct pps_device *pps)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&pps_idr_lock, flags);
- BUG_ON(atomic_read(&pps->usage) == 0);
-
- if (!atomic_dec_and_test(&pps->usage)) {
- pps = NULL;
- goto exit;
- }
-
- /* No more reference to the PPS source. We can safely remove the
- * PPS data struct.
- */
- idr_remove(&pps_idr, pps->id);
-
-exit:
- spin_unlock_irqrestore(&pps_idr_lock, flags);
- kfree(pps);
-}
-
/* pps_register_source - add a PPS source in the system
* @info: the PPS info struct
* @default_params: the default PPS parameters of the new source
* source is described by info's fields and it will have, as default PPS
* parameters, the ones specified into default_params.
*
- * The function returns, in case of success, the PPS source ID.
+ * The function returns, in case of success, the PPS device. Otherwise NULL.
*/
-int pps_register_source(struct pps_source_info *info, int default_params)
+struct pps_device *pps_register_source(struct pps_source_info *info,
+ int default_params)
{
struct pps_device *pps;
- int id;
int err;
/* Sanity checks */
if ((info->mode & default_params) != default_params) {
- printk(KERN_ERR "pps: %s: unsupported default parameters\n",
+ pr_err("%s: unsupported default parameters\n",
info->name);
err = -EINVAL;
goto pps_register_source_exit;
}
if ((info->mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) != 0 &&
info->echo == NULL) {
- printk(KERN_ERR "pps: %s: echo function is not defined\n",
+ pr_err("%s: echo function is not defined\n",
info->name);
err = -EINVAL;
goto pps_register_source_exit;
}
if ((info->mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
- printk(KERN_ERR "pps: %s: unspecified time format\n",
+ pr_err("%s: unspecified time format\n",
info->name);
err = -EINVAL;
goto pps_register_source_exit;
init_waitqueue_head(&pps->queue);
spin_lock_init(&pps->lock);
- atomic_set(&pps->usage, 1);
-
- /* Get new ID for the new PPS source */
- if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
- err = -ENOMEM;
- goto kfree_pps;
- }
-
- spin_lock_irq(&pps_idr_lock);
-
- /* Now really allocate the PPS source.
- * After idr_get_new() calling the new source will be freely available
- * into the kernel.
- */
- err = idr_get_new(&pps_idr, pps, &id);
- if (err < 0) {
- spin_unlock_irq(&pps_idr_lock);
- goto kfree_pps;
- }
-
- id = id & MAX_ID_MASK;
- if (id >= PPS_MAX_SOURCES) {
- spin_unlock_irq(&pps_idr_lock);
-
- printk(KERN_ERR "pps: %s: too many PPS sources in the system\n",
- info->name);
- err = -EBUSY;
- goto free_idr;
- }
- pps->id = id;
-
- spin_unlock_irq(&pps_idr_lock);
/* Create the char device */
err = pps_register_cdev(pps);
if (err < 0) {
- printk(KERN_ERR "pps: %s: unable to create char device\n",
+ pr_err("%s: unable to create char device\n",
info->name);
- goto free_idr;
+ goto kfree_pps;
}
- pr_info("new PPS source %s at ID %d\n", info->name, id);
+ dev_info(pps->dev, "new PPS source %s\n", info->name);
- return id;
-
-free_idr:
- spin_lock_irq(&pps_idr_lock);
- idr_remove(&pps_idr, id);
- spin_unlock_irq(&pps_idr_lock);
+ return pps;
kfree_pps:
kfree(pps);
pps_register_source_exit:
- printk(KERN_ERR "pps: %s: unable to register source\n", info->name);
+ pr_err("%s: unable to register source\n", info->name);
- return err;
+ return NULL;
}
EXPORT_SYMBOL(pps_register_source);
/* pps_unregister_source - remove a PPS source from the system
- * @source: the PPS source ID
+ * @pps: the PPS source
*
* This function is used to remove a previously registered PPS source from
* the system.
*/
-void pps_unregister_source(int source)
+void pps_unregister_source(struct pps_device *pps)
{
- struct pps_device *pps;
-
- spin_lock_irq(&pps_idr_lock);
- pps = idr_find(&pps_idr, source);
-
- if (!pps) {
- BUG();
- spin_unlock_irq(&pps_idr_lock);
- return;
- }
- spin_unlock_irq(&pps_idr_lock);
-
+ pps_kc_remove(pps);
pps_unregister_cdev(pps);
- pps_put_source(pps);
+
+ /* don't have to kfree(pps) here because it will be done on
+ * device destruction */
}
EXPORT_SYMBOL(pps_unregister_source);
/* pps_event - register a PPS event into the system
- * @source: the PPS source ID
+ * @pps: the PPS device
* @ts: the event timestamp
* @event: the event type
* @data: userdef pointer
* This function is used by each PPS client in order to register a new
* PPS event into the system (it's usually called inside an IRQ handler).
*
- * If an echo function is associated with the PPS source it will be called
+ * If an echo function is associated with the PPS device it will be called
* as:
- * pps->info.echo(source, event, data);
+ * pps->info.echo(pps, event, data);
*/
-
-void pps_event(int source, struct pps_ktime *ts, int event, void *data)
+void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
+ void *data)
{
- struct pps_device *pps;
unsigned long flags;
int captured = 0;
+ struct pps_ktime ts_real = { .sec = 0, .nsec = 0, .flags = 0 };
- if ((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0) {
- printk(KERN_ERR "pps: unknown event (%x) for source %d\n",
- event, source);
- return;
- }
+ /* check event type */
+ BUG_ON((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0);
- pps = pps_get_source(source);
- if (!pps)
- return;
+ dev_dbg(pps->dev, "PPS event at %ld.%09ld\n",
+ ts->ts_real.tv_sec, ts->ts_real.tv_nsec);
- pr_debug("PPS event on source %d at %llu.%06u\n",
- pps->id, (unsigned long long) ts->sec, ts->nsec);
+ timespec_to_pps_ktime(&ts_real, ts->ts_real);
spin_lock_irqsave(&pps->lock, flags);
/* Must call the echo function? */
if ((pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)))
- pps->info.echo(source, event, data);
+ pps->info.echo(pps, event, data);
/* Check the event */
pps->current_mode = pps->params.mode;
- if ((event & PPS_CAPTUREASSERT) &
- (pps->params.mode & PPS_CAPTUREASSERT)) {
+ if (event & pps->params.mode & PPS_CAPTUREASSERT) {
/* We have to add an offset? */
if (pps->params.mode & PPS_OFFSETASSERT)
- pps_add_offset(ts, &pps->params.assert_off_tu);
+ pps_add_offset(&ts_real,
+ &pps->params.assert_off_tu);
/* Save the time stamp */
- pps->assert_tu = *ts;
+ pps->assert_tu = ts_real;
pps->assert_sequence++;
- pr_debug("capture assert seq #%u for source %d\n",
- pps->assert_sequence, source);
+ dev_dbg(pps->dev, "capture assert seq #%u\n",
+ pps->assert_sequence);
captured = ~0;
}
- if ((event & PPS_CAPTURECLEAR) &
- (pps->params.mode & PPS_CAPTURECLEAR)) {
+ if (event & pps->params.mode & PPS_CAPTURECLEAR) {
/* We have to add an offset? */
if (pps->params.mode & PPS_OFFSETCLEAR)
- pps_add_offset(ts, &pps->params.clear_off_tu);
+ pps_add_offset(&ts_real,
+ &pps->params.clear_off_tu);
/* Save the time stamp */
- pps->clear_tu = *ts;
+ pps->clear_tu = ts_real;
pps->clear_sequence++;
- pr_debug("capture clear seq #%u for source %d\n",
- pps->clear_sequence, source);
+ dev_dbg(pps->dev, "capture clear seq #%u\n",
+ pps->clear_sequence);
captured = ~0;
}
- /* Wake up iif captured somthing */
+ pps_kc_event(pps, ts, event);
+
+ /* Wake up if captured something */
if (captured) {
- pps->go = ~0;
- wake_up_interruptible(&pps->queue);
+ pps->last_ev++;
+ wake_up_interruptible_all(&pps->queue);
kill_fasync(&pps->async_queue, SIGIO, POLL_IN);
}
spin_unlock_irqrestore(&pps->lock, flags);
-
- /* Now we can release the PPS source for (possible) deregistration */
- pps_put_source(pps);
}
EXPORT_SYMBOL(pps_event);
projects / mv-sheeva.git / blobdiff