[net-next, v3, 04/10] ptp: add kernel API ptp_get_vclocks_index()

[Yangbo Lu <yangbo.lu@xxxxxxx>]

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@xxxxxxx>
---
Changes for v3:
	- Added this patch.
---
 drivers/ptp/ptp_clock.c          |  3 ++-
 drivers/ptp/ptp_private.h        |  2 ++
 drivers/ptp/ptp_vclock.c         | 24 ++++++++++++++++++++++++
 include/linux/ptp_clock_kernel.h | 12 ++++++++++++
 4 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 38842a76acf8..88e43451b062 100644
--- 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 5671710ca0fa..16b7ba583ddd 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -91,6 +91,8 @@ static inline bool ptp_guaranteed_pclock(struct ptp_clock *ptp)
 	return false;
 }
 
+extern struct class *ptp_class;
+
 /*
  * see ptp_chardev.c
  */
diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index b8f500677314..8944b4fe32d8 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -152,3 +152,27 @@ 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);
+	num = ptp->n_vclocks;
+	memcpy(vclock_index, ptp->vclock_index, sizeof(int) * ptp->n_vclocks);
+	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 af12cc1e76d7..37f49d3e761e 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -306,6 +306,16 @@ 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
+ *
+ * @pclock_index: phc index of ptp pclock.
+ * @vclock_index: pointer to phc index of ptp vclocks.
+ *
+ * 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 +335,8 @@ static inline int ptp_schedule_worker(struct ptp_clock *ptp,
 { return -EOPNOTSUPP; }
 static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
 { }
+static int ptp_get_vclocks_index(int pclock_index, int *vclock_index)
+{ return 0; }
 
 #endif
 
-- 
2.25.1