Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / drivers / net / wireless / rt2x00 / rt2x00firmware.c
1 /*
2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3         <http://rt2x00.serialmonkey.com>
4
5         This program is free software; you can redistribute it and/or modify
6         it under the terms of the GNU General Public License as published by
7         the Free Software Foundation; either version 2 of the License, or
8         (at your option) any later version.
9
10         This program is distributed in the hope that it will be useful,
11         but WITHOUT ANY WARRANTY; without even the implied warranty of
12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13         GNU General Public License for more details.
14
15         You should have received a copy of the GNU General Public License
16         along with this program; if not, write to the
17         Free Software Foundation, Inc.,
18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 /*
22         Module: rt2x00lib
23         Abstract: rt2x00 firmware loading routines.
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28
29 #include "rt2x00.h"
30 #include "rt2x00lib.h"
31
32 static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
33 {
34         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
35         const struct firmware *fw;
36         char *fw_name;
37         int retval;
38         u16 crc;
39
40         /*
41          * Read correct firmware from harddisk.
42          */
43         fw_name = rt2x00dev->ops->lib->get_firmware_name(rt2x00dev);
44         if (!fw_name) {
45                 ERROR(rt2x00dev,
46                       "Invalid firmware filename.\n"
47                       "Please file bug report to %s.\n", DRV_PROJECT);
48                 return -EINVAL;
49         }
50
51         INFO(rt2x00dev, "Loading firmware file '%s'.\n", fw_name);
52
53         retval = request_firmware(&fw, fw_name, device);
54         if (retval) {
55                 ERROR(rt2x00dev, "Failed to request Firmware.\n");
56                 return retval;
57         }
58
59         if (!fw || !fw->size || !fw->data) {
60                 ERROR(rt2x00dev, "Failed to read Firmware.\n");
61                 return -ENOENT;
62         }
63
64         crc = rt2x00dev->ops->lib->get_firmware_crc(fw->data, fw->size);
65         if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
66                 ERROR(rt2x00dev, "Firmware checksum error.\n");
67                 retval = -ENOENT;
68                 goto exit;
69         }
70
71         INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n",
72              fw->data[fw->size - 4], fw->data[fw->size - 3]);
73
74         rt2x00dev->fw = fw;
75
76         return 0;
77
78 exit:
79         release_firmware(fw);
80
81         return retval;
82 }
83
84 int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)
85 {
86         int retval;
87
88         if (!test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags))
89                 return 0;
90
91         if (!rt2x00dev->fw) {
92                 retval = rt2x00lib_request_firmware(rt2x00dev);
93                 if (retval)
94                         return retval;
95         }
96
97         /*
98          * Send firmware to the device.
99          */
100         retval = rt2x00dev->ops->lib->load_firmware(rt2x00dev,
101                                                     rt2x00dev->fw->data,
102                                                     rt2x00dev->fw->size);
103         return retval;
104 }
105
106 void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
107 {
108         release_firmware(rt2x00dev->fw);
109         rt2x00dev->fw = NULL;
110 }