Root/
1 | /* |
2 | * Ultra Wide Band |
3 | * Scanning management |
4 | * |
5 | * Copyright (C) 2005-2006 Intel Corporation |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License version |
10 | * 2 as published by the Free Software Foundation. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
20 | * 02110-1301, USA. |
21 | * |
22 | * |
23 | * |
24 | * FIXME: docs |
25 | * FIXME: there are issues here on how BEACON and SCAN on USB RCI deal |
26 | * with each other. Currently seems that START_BEACON while |
27 | * SCAN_ONLY will cancel the scan, so we need to update the |
28 | * state here. Clarification request sent by email on |
29 | * 10/05/2005. |
30 | * 10/28/2005 No clear answer heard--maybe we'll hack the API |
31 | * so that when we start beaconing, if the HC is |
32 | * scanning in a mode not compatible with beaconing |
33 | * we just fail. |
34 | */ |
35 | |
36 | #include <linux/device.h> |
37 | #include <linux/err.h> |
38 | #include <linux/slab.h> |
39 | #include <linux/stat.h> |
40 | #include "uwb-internal.h" |
41 | |
42 | |
43 | /** |
44 | * Start/stop scanning in a radio controller |
45 | * |
46 | * @rc: UWB Radio Controller |
47 | * @channel: Channel to scan; encodings in WUSB1.0[Table 5.12] |
48 | * @type: Type of scanning to do. |
49 | * @bpst_offset: value at which to start scanning (if type == |
50 | * UWB_SCAN_ONLY_STARTTIME) |
51 | * @returns: 0 if ok, < 0 errno code on error |
52 | * |
53 | * We put the command on kmalloc'ed memory as some arches cannot do |
54 | * USB from the stack. The reply event is copied from an stage buffer, |
55 | * so it can be in the stack. See WUSB1.0[8.6.2.4] for more details. |
56 | */ |
57 | int uwb_rc_scan(struct uwb_rc *rc, |
58 | unsigned channel, enum uwb_scan_type type, |
59 | unsigned bpst_offset) |
60 | { |
61 | int result; |
62 | struct uwb_rc_cmd_scan *cmd; |
63 | struct uwb_rc_evt_confirm reply; |
64 | |
65 | result = -ENOMEM; |
66 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); |
67 | if (cmd == NULL) |
68 | goto error_kzalloc; |
69 | mutex_lock(&rc->uwb_dev.mutex); |
70 | cmd->rccb.bCommandType = UWB_RC_CET_GENERAL; |
71 | cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SCAN); |
72 | cmd->bChannelNumber = channel; |
73 | cmd->bScanState = type; |
74 | cmd->wStartTime = cpu_to_le16(bpst_offset); |
75 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; |
76 | reply.rceb.wEvent = UWB_RC_CMD_SCAN; |
77 | result = uwb_rc_cmd(rc, "SCAN", &cmd->rccb, sizeof(*cmd), |
78 | &reply.rceb, sizeof(reply)); |
79 | if (result < 0) |
80 | goto error_cmd; |
81 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { |
82 | dev_err(&rc->uwb_dev.dev, |
83 | "SCAN: command execution failed: %s (%d)\n", |
84 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); |
85 | result = -EIO; |
86 | goto error_cmd; |
87 | } |
88 | rc->scanning = channel; |
89 | rc->scan_type = type; |
90 | error_cmd: |
91 | mutex_unlock(&rc->uwb_dev.mutex); |
92 | kfree(cmd); |
93 | error_kzalloc: |
94 | return result; |
95 | } |
96 | |
97 | /* |
98 | * Print scanning state |
99 | */ |
100 | static ssize_t uwb_rc_scan_show(struct device *dev, |
101 | struct device_attribute *attr, char *buf) |
102 | { |
103 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
104 | struct uwb_rc *rc = uwb_dev->rc; |
105 | ssize_t result; |
106 | |
107 | mutex_lock(&rc->uwb_dev.mutex); |
108 | result = sprintf(buf, "%d %d\n", rc->scanning, rc->scan_type); |
109 | mutex_unlock(&rc->uwb_dev.mutex); |
110 | return result; |
111 | } |
112 | |
113 | /* |
114 | * |
115 | */ |
116 | static ssize_t uwb_rc_scan_store(struct device *dev, |
117 | struct device_attribute *attr, |
118 | const char *buf, size_t size) |
119 | { |
120 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
121 | struct uwb_rc *rc = uwb_dev->rc; |
122 | unsigned channel; |
123 | unsigned type; |
124 | unsigned bpst_offset = 0; |
125 | ssize_t result = -EINVAL; |
126 | |
127 | result = sscanf(buf, "%u %u %u\n", &channel, &type, &bpst_offset); |
128 | if (result >= 2 && type < UWB_SCAN_TOP) |
129 | result = uwb_rc_scan(rc, channel, type, bpst_offset); |
130 | |
131 | return result < 0 ? result : size; |
132 | } |
133 | |
134 | /** Radio Control sysfs interface (declaration) */ |
135 | DEVICE_ATTR(scan, S_IRUGO | S_IWUSR, uwb_rc_scan_show, uwb_rc_scan_store); |
136 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9