1/*
 2 *  hda_i915.c - routines for Haswell HDA controller power well support
 3 *
 4 *  This program is free software; you can redistribute it and/or modify it
 5 *  under the terms of the GNU General Public License as published by the Free
 6 *  Software Foundation; either version 2 of the License, or (at your option)
 7 *  any later version.
 8 *
 9 *  This program is distributed in the hope that it will be useful, but
10 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 *  for more details.
13 *
14 *  You should have received a copy of the GNU General Public License
15 *  along with this program; if not, write to the Free Software Foundation,
16 *  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17 */
18
19#include <linux/init.h>
20#include <linux/module.h>
21#include <sound/core.h>
22#include <drm/i915_powerwell.h>
23#include "hda_i915.h"
24
25static void (*get_power)(void);
26static void (*put_power)(void);
27
28void hda_display_power(bool enable)
29{
30	if (!get_power || !put_power)
31		return;
32
33	pr_debug("HDA display power %s \n",
34			enable ? "Enable" : "Disable");
35	if (enable)
36		get_power();
37	else
38		put_power();
39}
40
41int hda_i915_init(void)
42{
43	int err = 0;
44
45	get_power = symbol_request(i915_request_power_well);
46	if (!get_power) {
47		pr_warn("hda-i915: get_power symbol get fail\n");
48		return -ENODEV;
49	}
50
51	put_power = symbol_request(i915_release_power_well);
52	if (!put_power) {
53		symbol_put(i915_request_power_well);
54		get_power = NULL;
55		return -ENODEV;
56	}
57
58	pr_debug("HDA driver get symbol successfully from i915 module\n");
59
60	return err;
61}
62
63int hda_i915_exit(void)
64{
65	if (get_power) {
66		symbol_put(i915_request_power_well);
67		get_power = NULL;
68	}
69	if (put_power) {
70		symbol_put(i915_release_power_well);
71		put_power = NULL;
72	}
73
74	return 0;
75}