mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
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
/*
|
|
* 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->client.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->client.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->client.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);
|
|
drm->led = NULL;
|
|
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;
|
|
}
|
|
}
|