[src/trunk]: src/sys/dev/fdt Add GPIO LED driver.

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9a898b6d19f3
branches:  trunk
changeset: 825306:9a898b6d19f3
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jul 08 00:55:02 2017 +0000

description:
Add GPIO LED driver.

diffstat:

 sys/dev/fdt/files.fdt  |    6 ++-
 sys/dev/fdt/gpioleds.c |  113 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+), 1 deletions(-)

diffs (137 lines):

diff -r a3b38e991515 -r 9a898b6d19f3 sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt     Sat Jul 08 00:54:37 2017 +0000
+++ b/sys/dev/fdt/files.fdt     Sat Jul 08 00:55:02 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.17 2017/06/29 17:04:17 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.18 2017/07/08 00:55:02 jmcneill Exp $
 
 include        "external/bsd/libfdt/conf/files.libfdt"
 
@@ -22,6 +22,10 @@
 attach gpiokeys at fdt
 file   dev/fdt/gpiokeys.c                      gpiokeys
 
+device gpioleds: leds
+attach gpioleds at fdt
+file   dev/fdt/gpioleds.c                      gpioleds
+
 file   dev/fdt/fdt_openfirm.c                  fdtbus
 file   dev/fdt/fdt_subr.c                      fdtbus
 file   dev/fdt/fdt_clock.c                     fdtbus
diff -r a3b38e991515 -r 9a898b6d19f3 sys/dev/fdt/gpioleds.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/gpioleds.c    Sat Jul 08 00:55:02 2017 +0000
@@ -0,0 +1,113 @@
+/* $NetBSD: gpioleds.c,v 1.1 2017/07/08 00:55:02 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: gpioleds.c,v 1.1 2017/07/08 00:55:02 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kmem.h>
+#include <sys/bus.h>
+#include <sys/gpio.h>
+
+#include <dev/led.h>
+
+#include <dev/fdt/fdtvar.h>
+
+static int     gpioleds_match(device_t, cfdata_t, void *);
+static void    gpioleds_attach(device_t, device_t, void *);
+
+CFATTACH_DECL_NEW(gpioleds, 0, gpioleds_match, gpioleds_attach, NULL, NULL);
+
+static int
+gpioleds_get(void *priv)
+{
+       struct fdtbus_gpio_pin *pin = priv;
+
+       return fdtbus_gpio_read(pin);
+}
+
+static void
+gpioleds_set(void *priv, int state)
+{
+       struct fdtbus_gpio_pin *pin = priv;
+
+       fdtbus_gpio_write(pin, state);
+}
+
+static int
+gpioleds_match(device_t parent, cfdata_t cf, void *aux)
+{
+       const char * const compatible[] = { "gpio-leds", NULL };
+       const struct fdt_attach_args *faa = aux;
+
+       return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+gpioleds_attach(device_t parent, device_t self, void *aux)
+{
+       const struct fdt_attach_args *faa = aux;
+       const int phandle = faa->faa_phandle;
+       struct fdtbus_gpio_pin *pin;
+       const char *default_state;
+       char label[64];
+       int child;
+
+       aprint_naive("\n");
+       aprint_normal(":");
+
+       for (child = OF_child(phandle); child; child = OF_peer(child)) {
+               /* Get the label, fallback to node name */
+               if (OF_getprop(child, "label", label, sizeof(label)) <= 0 &&
+                   OF_getprop(child, "name", label, sizeof(label)) <= 0)
+                       continue;
+
+               /* Get the output pin */
+               pin = fdtbus_gpio_acquire(child, "gpios", GPIO_PIN_OUTPUT);
+               if (pin == NULL)
+                       continue;
+
+               /* Attach the LED */
+               if (led_attach(label, pin, gpioleds_get, gpioleds_set) == NULL)
+                       continue;
+
+               aprint_normal(" %s", label);
+
+               /* Set default state */
+               default_state = fdtbus_get_string(child, "default-state");
+               if (default_state && strcmp(default_state, "on") == 0)
+                       gpioleds_set(pin, LED_STATE_ON);
+               else if (default_state && strcmp(default_state, "off") == 0)
+                       gpioleds_set(pin, LED_STATE_OFF);
+       }
+
+       aprint_normal("\n");
+}