--- /dev/null
+/*
+ * Copyright (C) 2016 Martin Peres
+ *
+ * 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 (including the
+ * next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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 <martin.peres@free.fr>
+ */
+
+#include <linux/leds.h>
+
+#include "nouveau_led.h"
+#include <nvkm/subdev/gpio.h>
+
+static enum led_brightness
+nouveau_led_get_brightness(struct led_classdev *led)
+{
+ struct drm_device *drm_dev = container_of(led, struct nouveau_led, led)->dev;
+ struct nouveau_drm *drm = nouveau_drm(drm_dev);
+ struct nvif_object *device = &drm->device.object;
+ u32 div, duty;
+
+ div = nvif_rd32(device, 0x61c880) & 0x00ffffff;
+ duty = nvif_rd32(device, 0x61c884) & 0x00ffffff;
+
+ if (div > 0)
+ return duty * LED_FULL / div;
+ else
+ return 0;
+}
+
+static void
+nouveau_led_set_brightness(struct led_classdev *led, enum led_brightness value)
+{
+ struct drm_device *drm_dev = container_of(led, struct nouveau_led, led)->dev;
+ struct nouveau_drm *drm = nouveau_drm(drm_dev);
+ struct nvif_object *device = &drm->device.object;
+
+ u32 input_clk = 27e6; /* PDISPLAY.SOR[1].PWM is connected to the crystal */
+ u32 freq = 100; /* this is what nvidia uses and it should be good-enough */
+ u32 div, duty;
+
+ div = input_clk / freq;
+ duty = value * div / LED_FULL;
+
+ /* for now, this is safe to directly poke those registers because:
+ * - A: nvidia never puts the logo led to any other PWM controler
+ * than PDISPLAY.SOR[1].PWM.
+ * - B: nouveau does not touch these registers anywhere else
+ */
+ nvif_wr32(device, 0x61c880, div);
+ nvif_wr32(device, 0x61c884, 0xc0000000 | duty);
+}
+
+
+int
+nouveau_led_init(struct drm_device *dev)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+ struct nvkm_gpio *gpio = nvxx_gpio(&drm->device);
+ struct dcb_gpio_func logo_led;
+ int ret;
+
+ if (!gpio)
+ return 0;
+
+ /* check that there is a GPIO controlling the logo LED */
+ if (nvkm_gpio_find(gpio, 0, DCB_GPIO_LOGO_LED_PWM, 0xff, &logo_led))
+ return 0;
+
+ drm->led = kzalloc(sizeof(*drm->led), GFP_KERNEL);
+ if (!drm->led)
+ return -ENOMEM;
+ drm->led->dev = dev;
+
+ drm->led->led.name = "nvidia-logo";
+ drm->led->led.max_brightness = 255;
+ drm->led->led.brightness_get = nouveau_led_get_brightness;
+ drm->led->led.brightness_set = nouveau_led_set_brightness;
+
+ ret = led_classdev_register(dev->dev, &drm->led->led);
+ if (ret) {
+ kfree(drm->led);
+ return ret;
+ }
+
+ return 0;
+}
+
+void
+nouveau_led_suspend(struct drm_device *dev)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+
+ if (drm->led)
+ led_classdev_suspend(&drm->led->led);
+}
+
+void
+nouveau_led_resume(struct drm_device *dev)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+
+ if (drm->led)
+ led_classdev_resume(&drm->led->led);
+}
+
+void
+nouveau_led_fini(struct drm_device *dev)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+
+ if (drm->led) {
+ led_classdev_unregister(&drm->led->led);
+ kfree(drm->led);
+ drm->led = NULL;
+ }
+}
--- /dev/null
+/*
+ * Copyright 2015 Martin Peres
+ *
+ * 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 <martin.peres@free.fr>
+ */
+
+#ifndef __NOUVEAU_LED_H__
+#define __NOUVEAU_LED_H__
+
+#include "nouveau_drv.h"
+
+struct led_classdev;
+
+struct nouveau_led {
+ struct drm_device *dev;
+
+ struct led_classdev led;
+};
+
+static inline struct nouveau_led *
+nouveau_led(struct drm_device *dev)
+{
+ return nouveau_drm(dev)->led;
+}
+
+/* nouveau_led.c */
+#if IS_ENABLED(CONFIG_LEDS_CLASS)
+int nouveau_led_init(struct drm_device *dev);
+void nouveau_led_suspend(struct drm_device *dev);
+void nouveau_led_resume(struct drm_device *dev);
+void nouveau_led_fini(struct drm_device *dev);
+#else
+static inline int nouveau_led_init(struct drm_device *dev) { return 0; };
+static inline void nouveau_led_suspend(struct drm_device *dev) { };
+static inline void nouveau_led_resume(struct drm_device *dev) { };
+static inline void nouveau_led_fini(struct drm_device *dev) { };
+#endif
+
+#endif
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff