blob: 9d07e4edacdb4026fcd1b7cbdb7c85974b2a8489 [file] [log] [blame]
* hda_i915.c - routines for Haswell HDA controller power well support
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/init.h>
#include <linux/module.h>
#include <sound/core.h>
#include <drm/i915_powerwell.h>
#include "hda_i915.h"
static void (*get_power)(void);
static void (*put_power)(void);
void hda_display_power(bool enable)
if (!get_power || !put_power)
pr_debug("HDA display power %s \n",
enable ? "Enable" : "Disable");
if (enable)
int hda_i915_init(void)
int err = 0;
get_power = symbol_request(i915_request_power_well);
if (!get_power) {
pr_warn("hda-i915: get_power symbol get fail\n");
return -ENODEV;
put_power = symbol_request(i915_release_power_well);
if (!put_power) {
get_power = NULL;
return -ENODEV;
pr_debug("HDA driver get symbol successfully from i915 module\n");
return err;
int hda_i915_exit(void)
if (get_power) {
get_power = NULL;
if (put_power) {
put_power = NULL;
return 0;