diff options
author | Oleksandr Tymoshenko <gonzo@FreeBSD.org> | 2016-05-12 20:12:45 +0000 |
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committer | Oleksandr Tymoshenko <gonzo@FreeBSD.org> | 2016-05-12 20:12:45 +0000 |
commit | 3381a3898a104a62aaaefe03cd74a43a84c5b075 (patch) | |
tree | 0606b8eed7529ee6272a3350a501c90193df1bb7 /sys/dev/gpio | |
parent | 386881472597069c1659c96109bc89e95fc85411 (diff) | |
download | src-3381a3898a104a62aaaefe03cd74a43a84c5b075.tar.gz src-3381a3898a104a62aaaefe03cd74a43a84c5b075.zip |
Add gpiobus_release_pin function to release mapped pin
Add gpiobus_release_pin as a counterpart for gpiobus_map_pin. Without it
it's impossible to properly release pin so if kernel module is reloaded
it can't re-use pins again
Notes
Notes:
svn path=/head/; revision=299563
Diffstat (limited to 'sys/dev/gpio')
-rw-r--r-- | sys/dev/gpio/gpiobus.c | 24 | ||||
-rw-r--r-- | sys/dev/gpio/gpiobusvar.h | 1 |
2 files changed, 25 insertions, 0 deletions
diff --git a/sys/dev/gpio/gpiobus.c b/sys/dev/gpio/gpiobus.c index b26a741df31a..21e33b8b36ca 100644 --- a/sys/dev/gpio/gpiobus.c +++ b/sys/dev/gpio/gpiobus.c @@ -281,6 +281,30 @@ gpiobus_map_pin(device_t bus, uint32_t pin) return (0); } +/* Release mapped pin */ +int +gpiobus_release_pin(device_t bus, uint32_t pin) +{ + struct gpiobus_softc *sc; + + sc = device_get_softc(bus); + /* Consistency check. */ + if (pin >= sc->sc_npins) { + device_printf(bus, + "gpiobus_map_pin: invalid pin %d, max=%d\n", + pin, sc->sc_npins - 1); + return (-1); + } + + if (!sc->sc_pins[pin].mapped) { + device_printf(bus, "gpiobus_map_pin: pin %d is not mapped\n", pin); + return (-1); + } + sc->sc_pins[pin].mapped = 0; + + return (0); +} + static int gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask) { diff --git a/sys/dev/gpio/gpiobusvar.h b/sys/dev/gpio/gpiobusvar.h index 61901a334851..bc4e633a526e 100644 --- a/sys/dev/gpio/gpiobusvar.h +++ b/sys/dev/gpio/gpiobusvar.h @@ -138,6 +138,7 @@ int gpiobus_init_softc(device_t); int gpiobus_alloc_ivars(struct gpiobus_ivar *); void gpiobus_free_ivars(struct gpiobus_ivar *); int gpiobus_map_pin(device_t, uint32_t); +int gpiobus_release_pin(device_t, uint32_t); extern driver_t gpiobus_driver; |