diff options
| author | Richard Cochran | 2014-03-20 22:21:52 +0100 |
|---|---|---|
| committer | David S. Miller | 2014-03-21 14:21:13 -0400 |
| commit | 6092315dfdec5185881605d15a0e200d6e90eb66 (patch) | |
| tree | 8b018970396a2e2380fe51ed14d2f860ce6010e1 /drivers/ptp/ptp_clock.c | |
| parent | a85ae0e97879f51bccd8511668b07d346d98b3eb (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.c | 23 |
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) |