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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); |