1 /*
2 * Copyright © 2009 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Zhenyu Wang <zhenyu.z.wang@intel.com>
25 *
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <stdarg.h>
32 #include <pciaccess.h>
33 #include <err.h>
34 #include <fcntl.h>
35 #include <unistd.h>
36 #include <dirent.h>
37 #include <sys/stat.h>
38 #include <sys/types.h>
39
40 #include "intel_io.h"
41 #include "intel_reg.h"
42 #include "intel_chipset.h"
43
44 #define SWF14_LID_STATUS_CLOSED (1<<29) /* 0 here means open */
45
46 enum lid_status {
47 LID_UNKNOWN = -1,
48 LID_OPEN,
49 LID_CLOSE,
50 };
51
52 #define ACPI_BUTTON "/proc/acpi/button/"
53 #define ACPI_LID "/proc/acpi/button/lid/"
54
i830_lvds_acpi_lid_state(void)55 static int i830_lvds_acpi_lid_state(void)
56 {
57 int fd;
58 DIR *button_dir;
59 DIR *lid_dir;
60 struct dirent *lid_dent;
61 char *state_name;
62 char state[64];
63 enum lid_status ret = LID_UNKNOWN;
64
65 button_dir = opendir(ACPI_BUTTON);
66 /* If acpi button driver is not loaded, bypass ACPI check method */
67 if (button_dir == NULL)
68 goto out;
69 closedir(button_dir);
70
71 lid_dir = opendir(ACPI_LID);
72
73 /* no acpi lid object found */
74 if (lid_dir == NULL)
75 goto out;
76
77 while (1) {
78 lid_dent = readdir(lid_dir);
79 if (lid_dent == NULL) {
80 /* no LID object */
81 closedir(lid_dir);
82 goto out;
83 }
84 if (strcmp(lid_dent->d_name, ".") &&
85 strcmp(lid_dent->d_name, "..")) {
86 break;
87 }
88 }
89 state_name = malloc(strlen(ACPI_LID) + strlen(lid_dent->d_name) + 7);
90 memset(state_name, 0, strlen(ACPI_LID) + strlen(lid_dent->d_name) + 7);
91 strcat(state_name, ACPI_LID);
92 strcat(state_name, lid_dent->d_name);
93 strcat(state_name, "/state");
94
95 closedir(lid_dir);
96
97 if ((fd = open(state_name, O_RDONLY)) == -1) {
98 free(state_name);
99 goto out;
100 }
101 free(state_name);
102 if (read(fd, state, 64) == -1) {
103 close(fd);
104 goto out;
105 }
106 close(fd);
107 if (strstr(state, "open"))
108 ret = LID_OPEN;
109 else if (strstr(state, "closed"))
110 ret = LID_CLOSE;
111 else /* "unsupported" */
112 ret = LID_UNKNOWN;
113
114 out:
115 return ret;
116 }
117
main(int argc,char ** argv)118 int main(int argc, char **argv)
119 {
120 int swf14, acpi_lid;
121
122 intel_mmio_use_pci_bar(intel_get_pci_device());
123
124 while (1) {
125 swf14 = INREG(SWF14);
126
127 printf("Intel LVDS Lid status:\n");
128 printf("\tSWF14(0x%x) : %s\n", swf14,
129 swf14 & SWF14_LID_STATUS_CLOSED ? "close" : "open");
130
131 acpi_lid = i830_lvds_acpi_lid_state();
132 switch (acpi_lid) {
133 case LID_UNKNOWN:
134 printf("\tACPI Lid state : unknown\n");
135 break;
136 case LID_OPEN:
137 printf("\tACPI Lid state : open\n");
138 break;
139 case LID_CLOSE:
140 printf("\tACPI Lid state : close\n");
141 break;
142 }
143 sleep(2);
144 }
145 return 0;
146 }
147