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ca33fafdc9
If the led class registration fails, we free drm->led but do not reset it to NULL, which means that the suspend/resume/fini function will act as if everything went well in init() and will likely crash the kernel. This patch adds the missing drm->led = NULL. Reported-by: Emmanuel Pescosta <emmanuelpescosta099@gmail.com> Signed-off-by: Martin Peres <martin.peres@free.fr> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/*
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* Copyright (C) 2016 Martin Peres
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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/*
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* Authors:
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* Martin Peres <martin.peres@free.fr>
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*/
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#include <linux/leds.h>
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#include "nouveau_led.h"
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#include <nvkm/subdev/gpio.h>
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static enum led_brightness
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nouveau_led_get_brightness(struct led_classdev *led)
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{
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struct drm_device *drm_dev = container_of(led, struct nouveau_led, led)->dev;
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struct nouveau_drm *drm = nouveau_drm(drm_dev);
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struct nvif_object *device = &drm->client.device.object;
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u32 div, duty;
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div = nvif_rd32(device, 0x61c880) & 0x00ffffff;
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duty = nvif_rd32(device, 0x61c884) & 0x00ffffff;
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if (div > 0)
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return duty * LED_FULL / div;
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else
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return 0;
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}
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static void
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nouveau_led_set_brightness(struct led_classdev *led, enum led_brightness value)
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{
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struct drm_device *drm_dev = container_of(led, struct nouveau_led, led)->dev;
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struct nouveau_drm *drm = nouveau_drm(drm_dev);
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struct nvif_object *device = &drm->client.device.object;
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u32 input_clk = 27e6; /* PDISPLAY.SOR[1].PWM is connected to the crystal */
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u32 freq = 100; /* this is what nvidia uses and it should be good-enough */
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u32 div, duty;
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div = input_clk / freq;
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duty = value * div / LED_FULL;
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/* for now, this is safe to directly poke those registers because:
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* - A: nvidia never puts the logo led to any other PWM controler
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* than PDISPLAY.SOR[1].PWM.
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* - B: nouveau does not touch these registers anywhere else
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*/
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nvif_wr32(device, 0x61c880, div);
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nvif_wr32(device, 0x61c884, 0xc0000000 | duty);
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}
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int
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nouveau_led_init(struct drm_device *dev)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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struct nvkm_gpio *gpio = nvxx_gpio(&drm->client.device);
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struct dcb_gpio_func logo_led;
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int ret;
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if (!gpio)
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return 0;
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/* check that there is a GPIO controlling the logo LED */
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if (nvkm_gpio_find(gpio, 0, DCB_GPIO_LOGO_LED_PWM, 0xff, &logo_led))
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return 0;
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drm->led = kzalloc(sizeof(*drm->led), GFP_KERNEL);
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if (!drm->led)
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return -ENOMEM;
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drm->led->dev = dev;
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drm->led->led.name = "nvidia-logo";
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drm->led->led.max_brightness = 255;
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drm->led->led.brightness_get = nouveau_led_get_brightness;
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drm->led->led.brightness_set = nouveau_led_set_brightness;
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ret = led_classdev_register(dev->dev, &drm->led->led);
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if (ret) {
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kfree(drm->led);
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drm->led = NULL;
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return ret;
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}
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return 0;
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}
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void
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nouveau_led_suspend(struct drm_device *dev)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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if (drm->led)
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led_classdev_suspend(&drm->led->led);
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}
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void
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nouveau_led_resume(struct drm_device *dev)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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if (drm->led)
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led_classdev_resume(&drm->led->led);
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}
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void
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nouveau_led_fini(struct drm_device *dev)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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if (drm->led) {
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led_classdev_unregister(&drm->led->led);
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kfree(drm->led);
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drm->led = NULL;
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}
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}
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