--- /dev/null
+/*
+ * Copyright 2012 The Nouveau community
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Martin Peres
+ */
+
+#include "priv.h"
+
+#include <core/object.h>
+#include <core/device.h>
+
+#include <subdev/gpio.h>
+#include <subdev/timer.h>
+
+struct nouveau_fantog_priv {
+ struct nouveau_fan base;
+ struct nouveau_therm *parent;
+ struct nouveau_alarm alarm;
+ spinlock_t lock;
+ u32 period_us;
+ u32 percent;
+ struct dcb_gpio_func func;
+};
+
+static void
+nouveau_fantog_update(struct nouveau_fantog_priv *priv, int percent)
+{
+ struct nouveau_therm_priv *tpriv = (void *)priv->parent;
+ struct nouveau_timer *ptimer = nouveau_timer(tpriv);
+ struct nouveau_gpio *gpio = nouveau_gpio(tpriv);
+ unsigned long flags;
+ int duty;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (percent < 0)
+ percent = priv->percent;
+ priv->percent = percent;
+
+ duty = !gpio->get(gpio, 0, DCB_GPIO_PWM_FAN, 0xff);
+ gpio->set(gpio, 0, DCB_GPIO_PWM_FAN, 0xff, duty);
+
+ if (list_empty(&priv->alarm.head) && percent != (duty * 100)) {
+ u64 next_change = (percent * priv->period_us) / 100;
+ if (!duty)
+ next_change = priv->period_us - next_change;
+ ptimer->alarm(ptimer, next_change * 1000, &priv->alarm);
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void
+nouveau_fantog_alarm(struct nouveau_alarm *alarm)
+{
+ struct nouveau_fantog_priv *priv =
+ container_of(alarm, struct nouveau_fantog_priv, alarm);
+ nouveau_fantog_update(priv, -1);
+}
+
+static int
+nouveau_fantog_get(struct nouveau_therm *therm)
+{
+ struct nouveau_therm_priv *tpriv = (void *)therm;
+ struct nouveau_fantog_priv *priv = (void *)tpriv->fan;
+ return priv->percent;
+}
+
+int
+nouveau_fantog_set(struct nouveau_therm *therm, int percent)
+{
+ struct nouveau_therm_priv *tpriv = (void *)therm;
+ struct nouveau_fantog_priv *priv = (void *)tpriv->fan;
+ if (therm->pwm_ctrl)
+ therm->pwm_ctrl(therm, priv->func.line, false);
+ nouveau_fantog_update(priv, percent);
+ return 0;
+}
+
+int
+nouveau_fantog_create(struct nouveau_therm *therm, struct dcb_gpio_func *func)
+{
+ struct nouveau_therm_priv *tpriv = (void *)therm;
+ struct nouveau_fantog_priv *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ tpriv->fan = &priv->base;
+ if (!priv)
+ return -ENOMEM;
+
+ priv->parent = therm;
+ priv->base.type = "toggle";
+ priv->base.get = nouveau_fantog_get;
+ priv->base.set = nouveau_fantog_set;
+ nouveau_alarm_init(&priv->alarm, nouveau_fantog_alarm);
+ priv->period_us = 100000; /* 10Hz */
+ priv->percent = 100;
+ priv->func = *func;
+ spin_lock_init(&priv->lock);
+ return 0;
+}
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