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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 /drivers/ptp/ptp_clock.c
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 'drivers/ptp/ptp_clock.c')
-rw-r--r--drivers/ptp/ptp_clock.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index a8319b266643..e25d2bc898e5 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -169,6 +169,7 @@ static void delete_ptp_clock(struct posix_clock *pc)
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
mutex_destroy(&ptp->tsevq_mux);
+ mutex_destroy(&ptp->pincfg_mux);
ida_simple_remove(&ptp_clocks_map, ptp->index);
kfree(ptp);
}
@@ -203,6 +204,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
ptp->index = index;
spin_lock_init(&ptp->tsevq.lock);
mutex_init(&ptp->tsevq_mux);
+ mutex_init(&ptp->pincfg_mux);
init_waitqueue_head(&ptp->tsev_wq);
/* Create a new device in our class. */
@@ -249,6 +251,7 @@ no_sysfs:
device_destroy(ptp_class, ptp->devid);
no_device:
mutex_destroy(&ptp->tsevq_mux);
+ mutex_destroy(&ptp->pincfg_mux);
no_slot:
kfree(ptp);
no_memory:
@@ -305,6 +308,26 @@ int ptp_clock_index(struct ptp_clock *ptp)
}
EXPORT_SYMBOL(ptp_clock_index);
+int ptp_find_pin(struct ptp_clock *ptp,
+ enum ptp_pin_function func, unsigned int chan)
+{
+ struct ptp_pin_desc *pin = NULL;
+ int i;
+
+ mutex_lock(&ptp->pincfg_mux);
+ for (i = 0; i < ptp->info->n_pins; i++) {
+ if (ptp->info->pin_config[i].func == func &&
+ ptp->info->pin_config[i].chan == chan) {
+ pin = &ptp->info->pin_config[i];
+ break;
+ }
+ }
+ mutex_unlock(&ptp->pincfg_mux);
+
+ return pin ? i : -1;
+}
+EXPORT_SYMBOL(ptp_find_pin);
+
/* module operations */
static void __exit ptp_exit(void)