* 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/sched.h>
#include <linux/uaccess.h>
#include <linux/idr.h>
+#include <linux/mutex.h>
#include <linux/cdev.h>
#include <linux/poll.h>
#include <linux/pps_kernel.h>
+#include <linux/slab.h>
+
+#include "kc.h"
/*
* Local variables
static dev_t pps_devt;
static struct class *pps_class;
+static DEFINE_MUTEX(pps_idr_lock);
+static DEFINE_IDR(pps_idr);
+
/*
* Char device methods
*/
{
struct pps_device *pps = file->private_data;
struct pps_kparams params;
- struct pps_fdata fdata;
- unsigned long ticks;
void __user *uarg = (void __user *) arg;
int __user *iuarg = (int __user *) arg;
int err;
switch (cmd) {
case PPS_GETPARAMS:
- pr_debug("PPS_GETPARAMS: source %d\n", pps->id);
+ dev_dbg(pps->dev, "PPS_GETPARAMS\n");
spin_lock_irq(&pps->lock);
break;
case PPS_SETPARAMS:
- pr_debug("PPS_SETPARAMS: source %d\n", pps->id);
+ dev_dbg(pps->dev, "PPS_SETPARAMS\n");
/* Check the capabilities */
if (!capable(CAP_SYS_TIME))
if (err)
return -EFAULT;
if (!(params.mode & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR))) {
- pr_debug("capture mode unspecified (%x)\n",
+ dev_dbg(pps->dev, "capture mode unspecified (%x)\n",
params.mode);
return -EINVAL;
}
/* Check for supported capabilities */
if ((params.mode & ~pps->info.mode) != 0) {
- pr_debug("unsupported capabilities (%x)\n",
+ dev_dbg(pps->dev, "unsupported capabilities (%x)\n",
params.mode);
return -EINVAL;
}
/* Restore the read only parameters */
if ((params.mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
/* section 3.3 of RFC 2783 interpreted */
- pr_debug("time format unspecified (%x)\n",
+ dev_dbg(pps->dev, "time format unspecified (%x)\n",
params.mode);
pps->params.mode |= PPS_TSFMT_TSPEC;
}
break;
case PPS_GETCAP:
- pr_debug("PPS_GETCAP: source %d\n", pps->id);
+ dev_dbg(pps->dev, "PPS_GETCAP\n");
err = put_user(pps->info.mode, iuarg);
if (err)
break;
- case PPS_FETCH:
- pr_debug("PPS_FETCH: source %d\n", pps->id);
+ case PPS_FETCH: {
+ struct pps_fdata fdata;
+ unsigned int ev;
+
+ dev_dbg(pps->dev, "PPS_FETCH\n");
err = copy_from_user(&fdata, uarg, sizeof(struct pps_fdata));
if (err)
return -EFAULT;
- pps->go = 0;
+ ev = pps->last_ev;
/* Manage the timeout */
if (fdata.timeout.flags & PPS_TIME_INVALID)
- err = wait_event_interruptible(pps->queue, pps->go);
+ err = wait_event_interruptible(pps->queue,
+ ev != pps->last_ev);
else {
- pr_debug("timeout %lld.%09d\n",
+ unsigned long ticks;
+
+ dev_dbg(pps->dev, "timeout %lld.%09d\n",
(long long) fdata.timeout.sec,
fdata.timeout.nsec);
ticks = fdata.timeout.sec * HZ;
if (ticks != 0) {
err = wait_event_interruptible_timeout(
- pps->queue, pps->go, ticks);
+ pps->queue,
+ ev != pps->last_ev,
+ ticks);
if (err == 0)
return -ETIMEDOUT;
}
/* Check for pending signals */
if (err == -ERESTARTSYS) {
- pr_debug("pending signal caught\n");
+ dev_dbg(pps->dev, "pending signal caught\n");
return -EINTR;
}
return -EFAULT;
break;
+ }
+ case PPS_KC_BIND: {
+ struct pps_bind_args bind_args;
+
+ dev_dbg(pps->dev, "PPS_KC_BIND\n");
+
+ /* 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) {
+ dev_err(pps->dev, "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) {
+ dev_err(pps->dev, "invalid kernel consumer bind"
+ " parameters (%x)\n", bind_args.edge);
+ return -EINVAL;
+ }
+
+ err = pps_kc_bind(pps, &bind_args);
+ if (err < 0)
+ return err;
+
+ break;
+ }
default:
return -ENOTTY;
- break;
}
return 0;
{
struct pps_device *pps = container_of(inode->i_cdev,
struct pps_device, cdev);
- int found;
-
- found = pps_get_source(pps->id) != 0;
- if (!found)
- return -ENODEV;
-
file->private_data = pps;
return 0;
static int pps_cdev_release(struct inode *inode, struct file *file)
{
- struct pps_device *pps = file->private_data;
-
- /* Free the PPS source and wake up (possible) deregistration */
- pps_put_source(pps);
-
return 0;
}
.release = pps_cdev_release,
};
+static void pps_device_destruct(struct device *dev)
+{
+ struct pps_device *pps = dev_get_drvdata(dev);
+
+ /* release id here to protect others from using it while it's
+ * still in use */
+ mutex_lock(&pps_idr_lock);
+ idr_remove(&pps_idr, pps->id);
+ mutex_unlock(&pps_idr_lock);
+
+ kfree(dev);
+ kfree(pps);
+}
+
int pps_register_cdev(struct pps_device *pps)
{
int err;
+ dev_t devt;
+
+ mutex_lock(&pps_idr_lock);
+ /* Get new ID for the new PPS source */
+ if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
+ mutex_unlock(&pps_idr_lock);
+ return -ENOMEM;
+ }
+
+ /* 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, &pps->id);
+ mutex_unlock(&pps_idr_lock);
+
+ if (err < 0)
+ return err;
+
+ pps->id &= MAX_ID_MASK;
+ if (pps->id >= PPS_MAX_SOURCES) {
+ pr_err("%s: too many PPS sources in the system\n",
+ pps->info.name);
+ err = -EBUSY;
+ goto free_idr;
+ }
+
+ devt = MKDEV(MAJOR(pps_devt), pps->id);
- pps->devno = MKDEV(MAJOR(pps_devt), pps->id);
cdev_init(&pps->cdev, &pps_cdev_fops);
pps->cdev.owner = pps->info.owner;
- err = cdev_add(&pps->cdev, pps->devno, 1);
+ err = cdev_add(&pps->cdev, devt, 1);
if (err) {
- printk(KERN_ERR "pps: %s: failed to add char device %d:%d\n",
+ pr_err("%s: failed to add char device %d:%d\n",
pps->info.name, MAJOR(pps_devt), pps->id);
- return err;
+ goto free_idr;
}
- pps->dev = device_create(pps_class, pps->info.dev, pps->devno, NULL,
+ pps->dev = device_create(pps_class, pps->info.dev, devt, pps,
"pps%d", pps->id);
if (IS_ERR(pps->dev))
goto del_cdev;
- dev_set_drvdata(pps->dev, pps);
+
+ pps->dev->release = pps_device_destruct;
pr_debug("source %s got cdev (%d:%d)\n", pps->info.name,
MAJOR(pps_devt), pps->id);
del_cdev:
cdev_del(&pps->cdev);
+free_idr:
+ mutex_lock(&pps_idr_lock);
+ idr_remove(&pps_idr, pps->id);
+ mutex_unlock(&pps_idr_lock);
+
return err;
}
void pps_unregister_cdev(struct pps_device *pps)
{
- device_destroy(pps_class, pps->devno);
+ device_destroy(pps_class, pps->dev->devt);
cdev_del(&pps->cdev);
}
pps_class = class_create(THIS_MODULE, "pps");
if (!pps_class) {
- printk(KERN_ERR "pps: failed to allocate class\n");
+ pr_err("failed to allocate class\n");
return -ENOMEM;
}
pps_class->dev_attrs = pps_attrs;
err = alloc_chrdev_region(&pps_devt, 0, PPS_MAX_SOURCES, "pps");
if (err < 0) {
- printk(KERN_ERR "pps: failed to allocate char device region\n");
+ pr_err("failed to allocate char device region\n");
goto remove_class;
}
projects / mv-sheeva.git / blobdiff