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authorRichard Cochran <richardcochran@gmail.com>2014-03-20 22:21:52 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-21 14:21:13 -0400
commit6092315dfdec5185881605d15a0e200d6e90eb66 (patch)
tree8b018970396a2e2380fe51ed14d2f860ce6010e1 /include/linux/ptp_clock_kernel.h
parenta85ae0e97879f51bccd8511668b07d346d98b3eb (diff)
ptp: introduce programmable pins.
This patch adds a pair of new ioctls to the PTP Hardware Clock device interface. Using the ioctls, user space programs can query each pin to find out its current function and also reprogram a different function if desired. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ptp_clock_kernel.h')
-rw-r--r--include/linux/ptp_clock_kernel.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 38a993508327..0d8ff3fb84ba 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -49,7 +49,11 @@ struct ptp_clock_request {
* @n_alarm: The number of programmable alarms.
* @n_ext_ts: The number of external time stamp channels.
* @n_per_out: The number of programmable periodic signals.
+ * @n_pins: The number of programmable pins.
* @pps: Indicates whether the clock supports a PPS callback.
+ * @pin_config: Array of length 'n_pins'. If the number of
+ * programmable pins is nonzero, then drivers must
+ * allocate and initialize this array.
*
* clock operations
*
@@ -70,6 +74,18 @@ struct ptp_clock_request {
* parameter request: Desired resource to enable or disable.
* parameter on: Caller passes one to enable or zero to disable.
*
+ * @verify: Confirm that a pin can perform a given function. The PTP
+ * Hardware Clock subsystem maintains the 'pin_config'
+ * array on behalf of the drivers, but the PHC subsystem
+ * assumes that every pin can perform every function. This
+ * hook gives drivers a way of telling the core about
+ * limitations on specific pins. This function must return
+ * zero if the function can be assigned to this pin, and
+ * nonzero otherwise.
+ * parameter pin: index of the pin in question.
+ * parameter func: the desired function to use.
+ * parameter chan: the function channel index to use.
+ *
* Drivers should embed their ptp_clock_info within a private
* structure, obtaining a reference to it using container_of().
*
@@ -83,13 +99,17 @@ struct ptp_clock_info {
int n_alarm;
int n_ext_ts;
int n_per_out;
+ int n_pins;
int pps;
+ struct ptp_pin_desc *pin_config;
int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
int (*gettime)(struct ptp_clock_info *ptp, struct timespec *ts);
int (*settime)(struct ptp_clock_info *ptp, const struct timespec *ts);
int (*enable)(struct ptp_clock_info *ptp,
struct ptp_clock_request *request, int on);
+ int (*verify)(struct ptp_clock_info *ptp, unsigned int pin,
+ enum ptp_pin_function func, unsigned int chan);
};
struct ptp_clock;
@@ -156,4 +176,17 @@ extern void ptp_clock_event(struct ptp_clock *ptp,
extern int ptp_clock_index(struct ptp_clock *ptp);
+/**
+ * ptp_find_pin() - obtain the pin index of a given auxiliary function
+ *
+ * @ptp: The clock obtained from ptp_clock_register().
+ * @func: One of the ptp_pin_function enumerated values.
+ * @chan: The particular functional channel to find.
+ * Return: Pin index in the range of zero to ptp_clock_caps.n_pins - 1,
+ * or -1 if the auxiliary function cannot be found.
+ */
+
+int ptp_find_pin(struct ptp_clock *ptp,
+ enum ptp_pin_function func, unsigned int chan);
+
#endif