linux/drivers/gpu/drm/nouveau/nouveau_backlight.c
Dave Airlie 5bdebb183c drm/sysfs: sort out minor and connector device object lifetimes.
So drm was abusing device lifetimes, by having embedded device structures
in the minor and connector it meant that the lifetime of the internal drm
objects (drm_minor and drm_connector) were tied to the lifetime of the device
files in sysfs, so if something kept those files opened the current code
would kfree the objects and things would go downhill from there.

Now in reality there is no need for these lifetimes to be so intertwined,
especailly with hotplugging of devices where we wish to remove the sysfs
and userspace facing pieces before we can unwind the internal objects due
to open userspace files or mmaps, so split the objects out so the struct
device is no longer embedded and do what fbdev does and just allocate
and remove the sysfs inodes separately.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2013-10-22 09:37:40 +01:00

265 lines
7.1 KiB
C

/*
* Copyright (C) 2009 Red Hat <mjg@redhat.com>
*
* 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:
* Matthew Garrett <mjg@redhat.com>
*
* Register locations derived from NVClock by Roderick Colenbrander
*/
#include <linux/backlight.h>
#include <linux/acpi.h>
#include "nouveau_drm.h"
#include "nouveau_reg.h"
#include "nouveau_encoder.h"
static int
nv40_get_intensity(struct backlight_device *bd)
{
struct nouveau_drm *drm = bl_get_data(bd);
struct nouveau_device *device = nv_device(drm->device);
int val = (nv_rd32(device, NV40_PMC_BACKLIGHT) &
NV40_PMC_BACKLIGHT_MASK) >> 16;
return val;
}
static int
nv40_set_intensity(struct backlight_device *bd)
{
struct nouveau_drm *drm = bl_get_data(bd);
struct nouveau_device *device = nv_device(drm->device);
int val = bd->props.brightness;
int reg = nv_rd32(device, NV40_PMC_BACKLIGHT);
nv_wr32(device, NV40_PMC_BACKLIGHT,
(val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
return 0;
}
static const struct backlight_ops nv40_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nv40_get_intensity,
.update_status = nv40_set_intensity,
};
static int
nv40_backlight_init(struct drm_connector *connector)
{
struct nouveau_drm *drm = nouveau_drm(connector->dev);
struct nouveau_device *device = nv_device(drm->device);
struct backlight_properties props;
struct backlight_device *bd;
if (!(nv_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
return 0;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 31;
bd = backlight_device_register("nv_backlight", connector->kdev, drm,
&nv40_bl_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
drm->backlight = bd;
bd->props.brightness = nv40_get_intensity(bd);
backlight_update_status(bd);
return 0;
}
static int
nv50_get_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div = 1025;
u32 val;
val = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
val &= NV50_PDISP_SOR_PWM_CTL_VAL;
return ((val * 100) + (div / 2)) / div;
}
static int
nv50_set_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div = 1025;
u32 val = (bd->props.brightness * div) / 100;
nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
NV50_PDISP_SOR_PWM_CTL_NEW | val);
return 0;
}
static const struct backlight_ops nv50_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nv50_get_intensity,
.update_status = nv50_set_intensity,
};
static int
nva3_get_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div, val;
div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
val = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
if (div && div >= val)
return ((val * 100) + (div / 2)) / div;
return 100;
}
static int
nva3_set_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div, val;
div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
val = (bd->props.brightness * div) / 100;
if (div) {
nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
NV50_PDISP_SOR_PWM_CTL_NEW |
NVA3_PDISP_SOR_PWM_CTL_UNK);
return 0;
}
return -EINVAL;
}
static const struct backlight_ops nva3_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nva3_get_intensity,
.update_status = nva3_set_intensity,
};
static int
nv50_backlight_init(struct drm_connector *connector)
{
struct nouveau_drm *drm = nouveau_drm(connector->dev);
struct nouveau_device *device = nv_device(drm->device);
struct nouveau_encoder *nv_encoder;
struct backlight_properties props;
struct backlight_device *bd;
const struct backlight_ops *ops;
nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
if (!nv_encoder) {
nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
if (!nv_encoder)
return -ENODEV;
}
if (!nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
return 0;
if (device->chipset <= 0xa0 ||
device->chipset == 0xaa ||
device->chipset == 0xac)
ops = &nv50_bl_ops;
else
ops = &nva3_bl_ops;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 100;
bd = backlight_device_register("nv_backlight", connector->kdev,
nv_encoder, ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
drm->backlight = bd;
bd->props.brightness = bd->ops->get_brightness(bd);
backlight_update_status(bd);
return 0;
}
int
nouveau_backlight_init(struct drm_device *dev)
{
struct nouveau_drm *drm = nouveau_drm(dev);
struct nouveau_device *device = nv_device(drm->device);
struct drm_connector *connector;
#ifdef CONFIG_ACPI
if (acpi_video_backlight_support()) {
NV_INFO(drm, "ACPI backlight interface available, "
"not registering our own\n");
return 0;
}
#endif
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
connector->connector_type != DRM_MODE_CONNECTOR_eDP)
continue;
switch (device->card_type) {
case NV_40:
return nv40_backlight_init(connector);
case NV_50:
case NV_C0:
case NV_D0:
case NV_E0:
return nv50_backlight_init(connector);
default:
break;
}
}
return 0;
}
void
nouveau_backlight_exit(struct drm_device *dev)
{
struct nouveau_drm *drm = nouveau_drm(dev);
if (drm->backlight) {
backlight_device_unregister(drm->backlight);
drm->backlight = NULL;
}
}