1 /*
2 * Copyright (C) 2019-2022 Intel Corporation.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <sys/cdefs.h>
8 #include <sys/types.h>
9 #include <stdio.h>
10 #include <errno.h>
11 #include <pthread.h>
12 #include <signal.h>
13 #include <stdbool.h>
14 #include <pthread.h>
15 #include <unistd.h>
16 #include <fcntl.h>
17 #include <linux/input.h>
18 #include <dirent.h>
19 #include <string.h>
20 #include <stdlib.h>
21
22 #include "vmmapi.h"
23 #include "acpi.h"
24 #include "mevent.h"
25 #include "monitor.h"
26 #include "log.h"
27
28 #define POWER_BUTTON_NAME "power_button"
29 #define POWER_BUTTON_ACPI_DRV "/sys/bus/acpi/drivers/button/LNXPWRBN:00/"
30 #define POWER_BUTTON_INPUT_DIR POWER_BUTTON_ACPI_DRV"input"
31 #define POWER_BUTTON_PNP0C0C_DRV "/sys/bus/acpi/drivers/button/PNP0C0C:00/"
32 #define POWER_BUTTON_PNP0C0C_DIR POWER_BUTTON_PNP0C0C_DRV"input"
33
34 static struct mevent *input_evt0;
35 static int pwrbtn_fd = -1;
36 static bool monitor_run;
37
38 static void
input_event0_handler(int fd,enum ev_type type,void * arg)39 input_event0_handler(int fd, enum ev_type type, void *arg)
40 {
41 struct input_event ev;
42 int rc;
43
44 rc = read(fd, &ev, sizeof(ev));
45 if (rc < 0 || rc != sizeof(ev))
46 return;
47
48 /*
49 * The input key defines in input-event-codes.h
50 * KEY_POWER 116 SC System Power Down
51 */
52 if (ev.code == KEY_POWER && ev.value == 1)
53 inject_power_button_event(arg);
54 }
55
56 static int
vm_stop_handler(void * arg)57 vm_stop_handler(void *arg)
58 {
59 if (!arg)
60 return -EINVAL;
61
62 inject_power_button_event(arg);
63 return 0;
64 }
65
66 static int
vm_suspend_handler(void * arg)67 vm_suspend_handler(void *arg)
68 {
69 /*
70 * Invoke vm_stop_handler directly in here since suspend of User VM is
71 * set by User VM power button setting.
72 */
73 return vm_stop_handler(arg);
74 }
75
76 static struct monitor_vm_ops vm_ops = {
77 .stop = vm_stop_handler,
78 .suspend = vm_suspend_handler,
79 };
80
81 static int
input_dir_filter(const struct dirent * dir)82 input_dir_filter(const struct dirent *dir)
83 {
84 return !strncmp(dir->d_name, "input", 5);
85 }
86
87 static int
event_dir_filter(const struct dirent * dir)88 event_dir_filter(const struct dirent *dir)
89 {
90 return !strncmp(dir->d_name, "event", 5);
91 }
92
93 static int
open_power_button_input_device(const char * drv,const char * dir)94 open_power_button_input_device(const char *drv, const char *dir)
95 {
96 struct dirent **input_dirs = NULL;
97 struct dirent **event_dirs = NULL;
98 int ninput = 0;
99 int nevent = 0;
100 char path[256] = {0};
101 char name[256] = {0};
102 int rc, fd;
103
104 if (access(drv, F_OK) != 0)
105 return -1;
106 /*
107 * Scan path to get inputN
108 * path is /sys/bus/acpi/drivers/button/LNXPWRBN:00/input
109 */
110 ninput = scandir(dir, &input_dirs, input_dir_filter,
111 alphasort);
112 if (ninput < 0) {
113 pr_err("failed to scan power button %s\n",
114 dir);
115 goto err;
116 } else if (ninput == 1) {
117 rc = snprintf(path, sizeof(path), "%s/%s",
118 dir, input_dirs[0]->d_name);
119 if (rc < 0 || rc >= sizeof(path)) {
120 pr_err("failed to set power button path %d\n",
121 rc);
122 goto err_input;
123 }
124
125 /*
126 * Scan path to get eventN
127 * path is /sys/bus/acpi/drivers/button/LNXPWRBN:00/input/inputN
128 */
129 nevent = scandir(path, &event_dirs, event_dir_filter,
130 alphasort);
131 if (nevent < 0) {
132 pr_err("failed to get power button event %s\n",
133 path);
134 goto err_input;
135 } else if (nevent == 1) {
136
137 /* Get the power button input event name */
138 rc = snprintf(name, sizeof(name), "/dev/input/%s",
139 event_dirs[0]->d_name);
140 if (rc < 0 || rc >= sizeof(name)) {
141 pr_err("power button error %d\n", rc);
142 goto err_input;
143 }
144 } else {
145 pr_err("power button event number error %d\n",
146 nevent);
147 goto err_event;
148 }
149 } else {
150 pr_err("power button input number error %d\n", nevent);
151 goto err_input;
152 }
153
154 /* Open the input device */
155 fd = open(name, O_RDONLY);
156 if (fd > 0)
157 pr_info("Watching power button on %s\n", name);
158
159 while (nevent--)
160 free(event_dirs[nevent]);
161 free(event_dirs);
162 while (ninput--)
163 free(input_dirs[ninput]);
164 free(input_dirs);
165 return fd;
166
167 err_event:
168 while (nevent--)
169 free(event_dirs[nevent]);
170 free(event_dirs);
171
172 err_input:
173 while (ninput--)
174 free(input_dirs[ninput]);
175 free(input_dirs);
176
177 err:
178 return -1;
179 }
180
181 static int
open_native_power_button()182 open_native_power_button()
183 {
184 int fd;
185
186 /*
187 * Open fixed power button firstly, if it can't be opened
188 * try to open control method power button.
189 */
190 fd = open_power_button_input_device(POWER_BUTTON_ACPI_DRV,
191 POWER_BUTTON_INPUT_DIR);
192 if (fd < 0)
193 return open_power_button_input_device(
194 POWER_BUTTON_PNP0C0C_DRV,
195 POWER_BUTTON_PNP0C0C_DIR);
196 else
197 return fd;
198 }
199
200 void
power_button_init(struct vmctx * ctx)201 power_button_init(struct vmctx *ctx)
202 {
203 if (input_evt0 == NULL) {
204 pwrbtn_fd = open_native_power_button();
205 if (pwrbtn_fd < 0)
206 pr_err("open power button error=%d\n",
207 errno);
208 else
209 input_evt0 = mevent_add(pwrbtn_fd, EVF_READ,
210 input_event0_handler, ctx, NULL, NULL);
211 }
212
213 /*
214 * Suspend or shutdown User VM by acrnctl suspend and
215 * stop command.
216 */
217 if (monitor_run == false) {
218 if (monitor_register_vm_ops(&vm_ops, ctx,
219 POWER_BUTTON_NAME) < 0)
220 pr_err("failed to register vm ops for power button\n");
221 else
222 monitor_run = true;
223 }
224 }
225
226 void
power_button_deinit(struct vmctx * ctx)227 power_button_deinit(struct vmctx *ctx)
228 {
229 if (input_evt0 != NULL) {
230 mevent_delete_close(input_evt0);
231 input_evt0 = NULL;
232 pwrbtn_fd = -1;
233 }
234 }
235