3 * Implement and export a method for resetting a WiMAX device
6 * Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
7 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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.
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.
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
24 * This implements a simple synchronous call to reset a WiMAX device.
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).
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"
37 #define D_SUBMODULE op_reset
38 #include "debug-levels.h"
42 * wimax_reset - Reset a WiMAX device
44 * @wimax_dev: WiMAX device descriptor
48 * %0 if ok and a warm reset was done (the device still exists in
51 * -%ENODEV if a cold/bus reset had to be done (device has
52 * disconnected and reconnected, so current handle is not valid
55 * -%EINVAL if the device is not even registered.
57 * Any other negative error code shall be considered as
62 * Called when wanting to reset the device for any reason. Device is
63 * taken back to power on status.
65 * This call blocks; on succesful return, the device has completed the
66 * reset process and is ready to operate.
68 int wimax_reset(struct wimax_dev *wimax_dev)
71 struct device *dev = wimax_dev_to_dev(wimax_dev);
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);
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);
86 dev_put(wimax_dev->net_dev);
88 d_fnend(3, dev, "(wimax_dev %p) = %d\n", wimax_dev, result);
91 EXPORT_SYMBOL(wimax_reset);
95 struct nla_policy wimax_gnl_reset_policy[WIMAX_GNL_ATTR_MAX + 1] = {
96 [WIMAX_GNL_RESET_IFIDX] = {
103 * Exporting to user space over generic netlink
105 * Parse the reset command from user space, return error code.
110 int wimax_gnl_doit_reset(struct sk_buff *skb, struct genl_info *info)
113 struct wimax_dev *wimax_dev;
116 d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
118 if (info->attrs[WIMAX_GNL_RESET_IFIDX] == NULL) {
119 printk(KERN_ERR "WIMAX_GNL_OP_RFKILL: can't find IFIDX "
121 goto error_no_wimax_dev;
123 ifindex = nla_get_u32(info->attrs[WIMAX_GNL_RESET_IFIDX]);
124 wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
125 if (wimax_dev == NULL)
126 goto error_no_wimax_dev;
127 dev = wimax_dev_to_dev(wimax_dev);
128 /* Execute the operation and send the result back to user space */
129 result = wimax_reset(wimax_dev);
130 dev_put(wimax_dev->net_dev);
132 d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
137 struct genl_ops wimax_gnl_reset = {
138 .cmd = WIMAX_GNL_OP_RESET,
139 .flags = GENL_ADMIN_PERM,
140 .policy = wimax_gnl_reset_policy,
141 .doit = wimax_gnl_doit_reset,