1 /*
2 * Copyright 2007, Intel Corporation
3 *
4 * This file is part of PowerTOP
5 *
6 * This program file is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program in a file named COPYING; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301 USA
20 *
21 * Authors:
22 * Arjan van de Ven <arjan@linux.intel.com>
23 */
24
25 #include <unistd.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sys/types.h>
31 #include <dirent.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <sys/ioctl.h>
35 #include <errno.h>
36
37 #include "powertop.h"
38
39
40 /* structure definitions copied from include/net/bluetooth/hci.h from the 2.6.20 kernel */
41 #define HCIGETDEVINFO _IOR('H', 211, int)
42 #define BTPROTO_HCI 1
43
44 #define __u16 uint16_t
45 #define __u8 uint8_t
46 #define __u32 uint32_t
47
48 typedef struct {
49 __u8 b[6];
50 } __attribute__((packed)) bdaddr_t;
51
52 struct hci_dev_stats {
53 __u32 err_rx;
54 __u32 err_tx;
55 __u32 cmd_tx;
56 __u32 evt_rx;
57 __u32 acl_tx;
58 __u32 acl_rx;
59 __u32 sco_tx;
60 __u32 sco_rx;
61 __u32 byte_rx;
62 __u32 byte_tx;
63 };
64
65
66 struct hci_dev_info {
67 __u16 dev_id;
68 char name[8];
69
70 bdaddr_t bdaddr;
71
72 __u32 flags;
73 __u8 type;
74
75 __u8 features[8];
76
77 __u32 pkt_type;
78 __u32 link_policy;
79 __u32 link_mode;
80
81 __u16 acl_mtu;
82 __u16 acl_pkts;
83 __u16 sco_mtu;
84 __u16 sco_pkts;
85
86 struct hci_dev_stats stat;
87 };
88
89 static int previous_bytes = -1;
90
turn_bluetooth_off(void)91 void turn_bluetooth_off(void)
92 {
93 system("/usr/sbin/hciconfig hci0 down &> /dev/null");
94 system("/sbin/rmmod hci_usb &> /dev/null");
95 }
96
suggest_bluetooth_off(void)97 void suggest_bluetooth_off(void)
98 {
99 struct hci_dev_info devinfo;
100 FILE *file;
101 int fd;
102 int ret;
103 int thisbytes = 0;
104
105 /* first check if /sys/modules/bluetooth exists, if not, don't probe bluetooth because
106 it would trigger an autoload */
107
108 if (access("/sys/module/bluetooth",F_OK))
109 return;
110
111 fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
112 if (fd < 0)
113 return;
114
115 memset(&devinfo, 0, sizeof(devinfo));
116 strcpy(devinfo.name, "hci0");
117 ret = ioctl(fd, HCIGETDEVINFO, (void *) &devinfo);
118 if (ret < 0)
119 goto out;
120
121 if ( (devinfo.flags & 1) == 0 &&
122 access("/sys/module/hci_usb",F_OK)) /* interface down already */
123 goto out;
124
125 thisbytes += devinfo.stat.byte_rx;
126 thisbytes += devinfo.stat.byte_tx;
127
128 if (thisbytes != previous_bytes)
129 goto out;
130
131 /* now, also check for active connections */
132 file = popen("/usr/bin/hcitool con 2> /dev/null", "r");
133 if (file) {
134 char line[2048];
135 /* first line is standard header */
136 fgets(line,2048,file);
137 memset(line, 0, 2048);
138 fgets(line, 2047, file);
139 pclose(file);
140 if (strlen(line)>0)
141 goto out;
142 }
143
144 add_suggestion( _("Suggestion: Disable the unused bluetooth interface with the following command:\n"
145 " hciconfig hci0 down ; rmmod hci_usb\n"
146 "Bluetooth is a radio and consumes quite some power, and keeps USB busy as well.\n"), 40, 'B' , _(" B - Turn Bluetooth off "), turn_bluetooth_off);
147 out:
148 previous_bytes = thisbytes;
149 close(fd);
150 return;
151 }
152