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1 | /* |
2 | * Linux WiMAX |
3 | * Implement and export a method for resetting a WiMAX device |
4 | * |
5 | * |
6 | * Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com> |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> |
8 | * |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License version |
11 | * 2 as published by the Free Software Foundation. |
12 | * |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | * GNU General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this program; if not, write to the Free Software |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
21 | * 02110-1301, USA. |
22 | * |
23 | * |
24 | * This implements a simple synchronous call to reset a WiMAX device. |
25 | * |
26 | * Resets aim at being warm, keeping the device handles active; |
27 | * however, when that fails, it falls back to a cold reset (that will |
28 | * disconnect and reconnect the device). |
29 | */ |
30 | |
31 | #include <net/wimax.h> |
32 | #include <net/genetlink.h> |
33 | #include <linux/wimax.h> |
34 | #include <linux/security.h> |
35 | #include "wimax-internal.h" |
36 | |
37 | #define D_SUBMODULE op_reset |
38 | #include "debug-levels.h" |
39 | |
40 | |
41 | /** |
42 | * wimax_reset - Reset a WiMAX device |
43 | * |
44 | * @wimax_dev: WiMAX device descriptor |
45 | * |
46 | * Returns: |
47 | * |
48 | * %0 if ok and a warm reset was done (the device still exists in |
49 | * the system). |
50 | * |
51 | * -%ENODEV if a cold/bus reset had to be done (device has |
52 | * disconnected and reconnected, so current handle is not valid |
53 | * any more). |
54 | * |
55 | * -%EINVAL if the device is not even registered. |
56 | * |
57 | * Any other negative error code shall be considered as |
58 | * non-recoverable. |
59 | * |
60 | * Description: |
61 | * |
62 | * Called when wanting to reset the device for any reason. Device is |
63 | * taken back to power on status. |
64 | * |
65 | * This call blocks; on successful return, the device has completed the |
66 | * reset process and is ready to operate. |
67 | */ |
68 | int wimax_reset(struct wimax_dev *wimax_dev) |
69 | { |
70 | int result = -EINVAL; |
71 | struct device *dev = wimax_dev_to_dev(wimax_dev); |
72 | enum wimax_st state; |
73 | |
74 | might_sleep(); |
75 | d_fnstart(3, dev, "(wimax_dev %p)\n", wimax_dev); |
76 | mutex_lock(&wimax_dev->mutex); |
77 | dev_hold(wimax_dev->net_dev); |
78 | state = wimax_dev->state; |
79 | mutex_unlock(&wimax_dev->mutex); |
80 | |
81 | if (state >= WIMAX_ST_DOWN) { |
82 | mutex_lock(&wimax_dev->mutex_reset); |
83 | result = wimax_dev->op_reset(wimax_dev); |
84 | mutex_unlock(&wimax_dev->mutex_reset); |
85 | } |
86 | dev_put(wimax_dev->net_dev); |
87 | |
88 | d_fnend(3, dev, "(wimax_dev %p) = %d\n", wimax_dev, result); |
89 | return result; |
90 | } |
91 | EXPORT_SYMBOL(wimax_reset); |
92 | |
93 | |
94 | static const struct nla_policy wimax_gnl_reset_policy[WIMAX_GNL_ATTR_MAX + 1] = { |
95 | [WIMAX_GNL_RESET_IFIDX] = { |
96 | .type = NLA_U32, |
97 | }, |
98 | }; |
99 | |
100 | |
101 | /* |
102 | * Exporting to user space over generic netlink |
103 | * |
104 | * Parse the reset command from user space, return error code. |
105 | * |
106 | * No attributes. |
107 | */ |
108 | static |
109 | int wimax_gnl_doit_reset(struct sk_buff *skb, struct genl_info *info) |
110 | { |
111 | int result, ifindex; |
112 | struct wimax_dev *wimax_dev; |
113 | struct device *dev; |
114 | |
115 | d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info); |
116 | result = -ENODEV; |
117 | if (info->attrs[WIMAX_GNL_RESET_IFIDX] == NULL) { |
118 | printk(KERN_ERR "WIMAX_GNL_OP_RFKILL: can't find IFIDX " |
119 | "attribute\n"); |
120 | goto error_no_wimax_dev; |
121 | } |
122 | ifindex = nla_get_u32(info->attrs[WIMAX_GNL_RESET_IFIDX]); |
123 | wimax_dev = wimax_dev_get_by_genl_info(info, ifindex); |
124 | if (wimax_dev == NULL) |
125 | goto error_no_wimax_dev; |
126 | dev = wimax_dev_to_dev(wimax_dev); |
127 | /* Execute the operation and send the result back to user space */ |
128 | result = wimax_reset(wimax_dev); |
129 | dev_put(wimax_dev->net_dev); |
130 | error_no_wimax_dev: |
131 | d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result); |
132 | return result; |
133 | } |
134 | |
135 | |
136 | struct genl_ops wimax_gnl_reset = { |
137 | .cmd = WIMAX_GNL_OP_RESET, |
138 | .flags = GENL_ADMIN_PERM, |
139 | .policy = wimax_gnl_reset_policy, |
140 | .doit = wimax_gnl_doit_reset, |
141 | .dumpit = NULL, |
142 | }; |
143 |
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