Module Name: src
Committed By: jmcneill
Date: Wed Jul 4 23:08:06 UTC 2018
Modified Files:
src/sys/dev/fdt: files.fdt
Added Files:
src/sys/dev/fdt: pwm_fan.c
Log Message:
Add basic pwm-fan driver. This doesn't have any smarts yet other than
turning the fan on at 100% duty cycle.
To generate a diff of this commit:
cvs rdiff -u -r1.35 -r1.36 src/sys/dev/fdt/files.fdt
cvs rdiff -u -r0 -r1.1 src/sys/dev/fdt/pwm_fan.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/fdt/files.fdt
diff -u src/sys/dev/fdt/files.fdt:1.35 src/sys/dev/fdt/files.fdt:1.36
--- src/sys/dev/fdt/files.fdt:1.35 Sat Jun 30 16:22:56 2018
+++ src/sys/dev/fdt/files.fdt Wed Jul 4 23:08:06 2018
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.35 2018/06/30 16:22:56 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.36 2018/07/04 23:08:06 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -78,6 +78,10 @@ device pwmbacklight
attach pwmbacklight at fdt
file dev/fdt/pwm_backlight.c pwmbacklight
+device pwmfan
+attach pwmfan at fdt
+file dev/fdt/pwm_fan.c pwmfan
+
device ausoc: audiobus
attach ausoc at fdt
file dev/fdt/ausoc.c ausoc
Added files:
Index: src/sys/dev/fdt/pwm_fan.c
diff -u /dev/null src/sys/dev/fdt/pwm_fan.c:1.1
--- /dev/null Wed Jul 4 23:08:07 2018
+++ src/sys/dev/fdt/pwm_fan.c Wed Jul 4 23:08:06 2018
@@ -0,0 +1,128 @@
+/* $NetBSD: pwm_fan.c,v 1.1 2018/07/04 23:08:06 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 Jared McNeill <jmcne...@invisible.ca>
+ * 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: pwm_fan.c,v 1.1 2018/07/04 23:08:06 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/kmem.h>
+#include <sys/gpio.h>
+
+#include <dev/pwm/pwmvar.h>
+
+#include <dev/fdt/fdtvar.h>
+
+struct pwm_fan_softc {
+ device_t sc_dev;
+ pwm_tag_t sc_pwm;
+ struct fdtbus_gpio_pin *sc_pin;
+
+ u_int *sc_levels;
+ u_int sc_nlevels;
+};
+
+static int pwm_fan_match(device_t, cfdata_t, void *);
+static void pwm_fan_attach(device_t, device_t, void *);
+
+static void pwm_fan_set(struct pwm_fan_softc *, u_int);
+
+static const char *compatible[] = {
+ "pwm-fan",
+ NULL
+};
+
+CFATTACH_DECL_NEW(pwmfan, sizeof(struct pwm_fan_softc),
+ pwm_fan_match, pwm_fan_attach, NULL, NULL);
+
+static int
+pwm_fan_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+pwm_fan_attach(device_t parent, device_t self, void *aux)
+{
+ struct pwm_fan_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ const u_int *levels;
+ u_int n;
+ int len;
+
+ sc->sc_dev = self;
+ sc->sc_pwm = fdtbus_pwm_acquire(phandle, "pwms");
+ if (sc->sc_pwm == NULL) {
+ aprint_error(": couldn't acquire pwm\n");
+ return;
+ }
+
+ levels = fdtbus_get_prop(phandle, "cooling-levels", &len);
+ if (len < 4) {
+ aprint_error(": couldn't get 'cooling-levels' property\n");
+ return;
+ }
+ sc->sc_levels = kmem_alloc(len, KM_SLEEP);
+ sc->sc_nlevels = len / 4;
+ for (n = 0; n < sc->sc_nlevels; n++)
+ sc->sc_levels[n] = be32toh(levels[n]);
+
+ aprint_naive("\n");
+ aprint_normal(": PWM Fan");
+ aprint_normal(" (levels");
+ for (n = 0; n < sc->sc_nlevels; n++) {
+ aprint_normal(" %u%%", (sc->sc_levels[n] * 100) / 255);
+ }
+ aprint_normal(")\n");
+
+ /* Select the highest cooling level */
+ pwm_fan_set(sc, 255);
+}
+
+static void
+pwm_fan_set(struct pwm_fan_softc *sc, u_int level)
+{
+ struct pwm_config conf;
+
+ if (level > 255)
+ level = 255;
+
+ aprint_debug_dev(sc->sc_dev, "set duty cycle to %u%%\n", (level * 100) / 255);
+
+ pwm_disable(sc->sc_pwm);
+ pwm_get_config(sc->sc_pwm, &conf);
+ conf.duty_cycle = (conf.period * level) / 255;
+ pwm_set_config(sc->sc_pwm, &conf);
+ pwm_enable(sc->sc_pwm);
+}
