diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_led.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_led.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_led.c b/drivers/gpu/drm/nouveau/nouveau_led.c new file mode 100644 index 000000000000..3e2f1b6cd4df --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_led.c @@ -0,0 +1,139 @@ +/* + * 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; + } +} |