ptp: add kernel API ptp_get_vclocks_index()

Add kernel API ptp_get_vclocks_index() to get all ptp
vclocks index on pclock.

This is preparation for supporting ptp vclocks info query
through ethtool.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 9205a93..f012fa5 100644 (file)
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -24,10 +24,11 @@
 #define PTP_PPS_EVENT PPS_CAPTUREASSERT
 #define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)
 
+struct class *ptp_class;
+
 /* private globals */
 
 static dev_t ptp_devt;
-static struct class *ptp_class;
 
 static DEFINE_IDA(ptp_clocks_map);
 

diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index f75fadd..dba6be4 100644 (file)
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -96,6 +96,8 @@ static inline bool ptp_vclock_in_use(struct ptp_clock *ptp)
        return in_use;
 }
 
+extern struct class *ptp_class;
+
 /*
  * see ptp_chardev.c
  */

diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index fc9205c..cefab29 100644 (file)
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -148,3 +148,38 @@ void ptp_vclock_unregister(struct ptp_vclock *vclock)
        ptp_clock_unregister(vclock->clock);
        kfree(vclock);
 }
+
+int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
+{
+       char name[PTP_CLOCK_NAME_LEN] = "";
+       struct ptp_clock *ptp;
+       struct device *dev;
+       int num = 0;
+
+       if (pclock_index < 0)
+               return num;
+
+       snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", pclock_index);
+       dev = class_find_device_by_name(ptp_class, name);
+       if (!dev)
+               return num;
+
+       ptp = dev_get_drvdata(dev);
+
+       if (mutex_lock_interruptible(&ptp->n_vclocks_mux)) {
+               put_device(dev);
+               return num;
+       }
+
+       *vclock_index = kzalloc(sizeof(int) * ptp->n_vclocks, GFP_KERNEL);
+       if (!(*vclock_index))
+               goto out;
+
+       memcpy(*vclock_index, ptp->vclock_index, sizeof(int) * ptp->n_vclocks);
+       num = ptp->n_vclocks;
+out:
+       mutex_unlock(&ptp->n_vclocks_mux);
+       put_device(dev);
+       return num;
+}
+EXPORT_SYMBOL(ptp_get_vclocks_index);

diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index b6fb771..300a984 100644 (file)
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -306,6 +306,18 @@ int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
  */
 void ptp_cancel_worker_sync(struct ptp_clock *ptp);
 
+/**
+ * ptp_get_vclocks_index() - get all vclocks index on pclock, and
+ *                           caller is responsible to free memory
+ *                           of vclock_index
+ *
+ * @pclock_index: phc index of ptp pclock.
+ * @vclock_index: pointer to pointer of vclock index.
+ *
+ * return number of vclocks.
+ */
+int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
+
 #else
 static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
                                                   struct device *parent)
@@ -325,6 +337,8 @@ static inline int ptp_schedule_worker(struct ptp_clock *ptp,
 { return -EOPNOTSUPP; }
 static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
 { }
+static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
+{ return 0; }
 
 #endif