linux/drivers/net/wimax/i2400m/driver.c

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/*
* Intel Wireless WiMAX Connection 2400m
* Generic probe/disconnect, reset and message passing
*
*
* Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* See i2400m.h for driver documentation. This contains helpers for
* the driver model glue [_setup()/_release()], handling device resets
* [_dev_reset_handle()], and the backends for the WiMAX stack ops
* reset [_op_reset()] and message from user [_op_msg_from_user()].
*
* ROADMAP:
*
* i2400m_op_msg_from_user()
* i2400m_msg_to_dev()
* wimax_msg_to_user_send()
*
* i2400m_op_reset()
* i240m->bus_reset()
*
* i2400m_dev_reset_handle()
* __i2400m_dev_reset_handle()
* __i2400m_dev_stop()
* __i2400m_dev_start()
*
* i2400m_setup()
* i2400m_bootrom_init()
* register_netdev()
* i2400m_dev_start()
* __i2400m_dev_start()
* i2400m_dev_bootstrap()
* i2400m_tx_setup()
* i2400m->bus_dev_start()
* i2400m_firmware_check()
* i2400m_check_mac_addr()
* wimax_dev_add()
*
* i2400m_release()
* wimax_dev_rm()
* i2400m_dev_stop()
* __i2400m_dev_stop()
* i2400m_dev_shutdown()
* i2400m->bus_dev_stop()
* i2400m_tx_release()
* unregister_netdev()
*/
#include "i2400m.h"
#include <linux/etherdevice.h>
#include <linux/wimax/i2400m.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#define D_SUBMODULE driver
#include "debug-levels.h"
int i2400m_idle_mode_disabled; /* 0 (idle mode enabled) by default */
module_param_named(idle_mode_disabled, i2400m_idle_mode_disabled, int, 0644);
MODULE_PARM_DESC(idle_mode_disabled,
"If true, the device will not enable idle mode negotiation "
"with the base station (when connected) to save power.");
wimax/i2400m: implement RX reorder support Allow the device to give the driver RX data with reorder information. When that is done, the device will indicate the driver if a packet has to be held in a (sorted) queue. It will also tell the driver when held packets have to be released to the OS. This is done to improve the WiMAX-protocol level retransmission support when missing frames are detected. The code docs provide details about the implementation. In general, this just hooks into the RX path in rx.c; if a packet with the reorder bit in the RX header is detected, the reorder information in the header is extracted and one of the four main reorder operations are executed. In one case (queue) no packet will be delivered to the networking stack, just queued, whereas in the others (reset, update_ws and queue_update_ws), queued packet might be delivered depending on the window start for the specific queue. The modifications to files other than rx.c are: - control.c: during device initialization, enable reordering support if the rx_reorder_disabled module parameter is not enabled - driver.c: expose a rx_reorder_disable module parameter and call i2400m_rx_setup/release() to initialize/shutdown RX reorder support. - i2400m.h: introduce members in 'struct i2400m' needed for implementing reorder support. - linux/i2400m.h: introduce TLVs, commands and constant definitions related to RX reorder Last but not least, the rx reorder code includes an small circular log where the last N reorder operations are recorded to be displayed in case of inconsistency. Otherwise diagnosing issues would be almost impossible. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-01 07:42:54 +08:00
int i2400m_rx_reorder_disabled; /* 0 (rx reorder enabled) by default */
module_param_named(rx_reorder_disabled, i2400m_rx_reorder_disabled, int, 0644);
MODULE_PARM_DESC(rx_reorder_disabled,
"If true, RX reordering will be disabled.");
/**
* i2400m_queue_work - schedule work on a i2400m's queue
*
* @i2400m: device descriptor
*
* @fn: function to run to execute work. It gets passed a 'struct
* work_struct' that is wrapped in a 'struct i2400m_work'. Once
* done, you have to (1) i2400m_put(i2400m_work->i2400m) and then
* (2) kfree(i2400m_work).
*
* @gfp_flags: GFP flags for memory allocation.
*
* @pl: pointer to a payload buffer that you want to pass to the _work
* function. Use this to pack (for example) a struct with extra
* arguments.
*
* @pl_size: size of the payload buffer.
*
* We do this quite often, so this just saves typing; allocate a
* wrapper for a i2400m, get a ref to it, pack arguments and launch
* the work.
*
* A usual workflow is:
*
* struct my_work_args {
* void *something;
* int whatever;
* };
* ...
*
* struct my_work_args my_args = {
* .something = FOO,
* .whaetever = BLAH
* };
* i2400m_queue_work(i2400m, 1, my_work_function, GFP_KERNEL,
* &args, sizeof(args))
*
* And now the work function can unpack the arguments and call the
* real function (or do the job itself):
*
* static
* void my_work_fn((struct work_struct *ws)
* {
* struct i2400m_work *iw =
* container_of(ws, struct i2400m_work, ws);
* struct my_work_args *my_args = (void *) iw->pl;
*
* my_work(iw->i2400m, my_args->something, my_args->whatevert);
* }
*/
int i2400m_queue_work(struct i2400m *i2400m,
void (*fn)(struct work_struct *), gfp_t gfp_flags,
const void *pl, size_t pl_size)
{
int result;
struct i2400m_work *iw;
BUG_ON(i2400m->work_queue == NULL);
result = -ENOMEM;
iw = kzalloc(sizeof(*iw) + pl_size, gfp_flags);
if (iw == NULL)
goto error_kzalloc;
iw->i2400m = i2400m_get(i2400m);
memcpy(iw->pl, pl, pl_size);
INIT_WORK(&iw->ws, fn);
result = queue_work(i2400m->work_queue, &iw->ws);
error_kzalloc:
return result;
}
EXPORT_SYMBOL_GPL(i2400m_queue_work);
/*
* Schedule i2400m's specific work on the system's queue.
*
* Used for a few cases where we really need it; otherwise, identical
* to i2400m_queue_work().
*
* Returns < 0 errno code on error, 1 if ok.
*
* If it returns zero, something really bad happened, as it means the
* works struct was already queued, but we have just allocated it, so
* it should not happen.
*/
int i2400m_schedule_work(struct i2400m *i2400m,
void (*fn)(struct work_struct *), gfp_t gfp_flags)
{
int result;
struct i2400m_work *iw;
BUG_ON(i2400m->work_queue == NULL);
result = -ENOMEM;
iw = kzalloc(sizeof(*iw), gfp_flags);
if (iw == NULL)
goto error_kzalloc;
iw->i2400m = i2400m_get(i2400m);
INIT_WORK(&iw->ws, fn);
result = schedule_work(&iw->ws);
if (result == 0)
result = -ENXIO;
error_kzalloc:
return result;
}
/*
* WiMAX stack operation: relay a message from user space
*
* @wimax_dev: device descriptor
* @pipe_name: named pipe the message is for
* @msg_buf: pointer to the message bytes
* @msg_len: length of the buffer
* @genl_info: passed by the generic netlink layer
*
* The WiMAX stack will call this function when a message was received
* from user space.
*
* For the i2400m, this is an L3L4 message, as specified in
* include/linux/wimax/i2400m.h, and thus prefixed with a 'struct
* i2400m_l3l4_hdr'. Driver (and device) expect the messages to be
* coded in Little Endian.
*
* This function just verifies that the header declaration and the
* payload are consistent and then deals with it, either forwarding it
* to the device or procesing it locally.
*
* In the i2400m, messages are basically commands that will carry an
* ack, so we use i2400m_msg_to_dev() and then deliver the ack back to
* user space. The rx.c code might intercept the response and use it
* to update the driver's state, but then it will pass it on so it can
* be relayed back to user space.
*
* Note that asynchronous events from the device are processed and
* sent to user space in rx.c.
*/
static
int i2400m_op_msg_from_user(struct wimax_dev *wimax_dev,
const char *pipe_name,
const void *msg_buf, size_t msg_len,
const struct genl_info *genl_info)
{
int result;
struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev);
struct device *dev = i2400m_dev(i2400m);
struct sk_buff *ack_skb;
d_fnstart(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p "
"msg_len %zu genl_info %p)\n", wimax_dev, i2400m,
msg_buf, msg_len, genl_info);
ack_skb = i2400m_msg_to_dev(i2400m, msg_buf, msg_len);
result = PTR_ERR(ack_skb);
if (IS_ERR(ack_skb))
goto error_msg_to_dev;
result = wimax_msg_send(&i2400m->wimax_dev, ack_skb);
error_msg_to_dev:
d_fnend(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p msg_len %zu "
"genl_info %p) = %d\n", wimax_dev, i2400m, msg_buf, msg_len,
genl_info, result);
return result;
}
/*
* Context to wait for a reset to finalize
*/
struct i2400m_reset_ctx {
struct completion completion;
int result;
};
/*
* WiMAX stack operation: reset a device
*
* @wimax_dev: device descriptor
*
* See the documentation for wimax_reset() and wimax_dev->op_reset for
* the requirements of this function. The WiMAX stack guarantees
* serialization on calls to this function.
*
* Do a warm reset on the device; if it fails, resort to a cold reset
* and return -ENODEV. On successful warm reset, we need to block
* until it is complete.
*
* The bus-driver implementation of reset takes care of falling back
* to cold reset if warm fails.
*/
static
int i2400m_op_reset(struct wimax_dev *wimax_dev)
{
int result;
struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev);
struct device *dev = i2400m_dev(i2400m);
struct i2400m_reset_ctx ctx = {
.completion = COMPLETION_INITIALIZER_ONSTACK(ctx.completion),
.result = 0,
};
d_fnstart(4, dev, "(wimax_dev %p)\n", wimax_dev);
mutex_lock(&i2400m->init_mutex);
i2400m->reset_ctx = &ctx;
mutex_unlock(&i2400m->init_mutex);
result = i2400m->bus_reset(i2400m, I2400M_RT_WARM);
if (result < 0)
goto out;
result = wait_for_completion_timeout(&ctx.completion, 4*HZ);
if (result == 0)
result = -ETIMEDOUT;
else if (result > 0)
result = ctx.result;
/* if result < 0, pass it on */
mutex_lock(&i2400m->init_mutex);
i2400m->reset_ctx = NULL;
mutex_unlock(&i2400m->init_mutex);
out:
d_fnend(4, dev, "(wimax_dev %p) = %d\n", wimax_dev, result);
return result;
}
/*
* Check the MAC address we got from boot mode is ok
*
* @i2400m: device descriptor
*
* Returns: 0 if ok, < 0 errno code on error.
*/
static
int i2400m_check_mac_addr(struct i2400m *i2400m)
{
int result;
struct device *dev = i2400m_dev(i2400m);
struct sk_buff *skb;
const struct i2400m_tlv_detailed_device_info *ddi;
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
const unsigned char zeromac[ETH_ALEN] = { 0 };
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
skb = i2400m_get_device_info(i2400m);
if (IS_ERR(skb)) {
result = PTR_ERR(skb);
dev_err(dev, "Cannot verify MAC address, error reading: %d\n",
result);
goto error;
}
/* Extract MAC addresss */
ddi = (void *) skb->data;
BUILD_BUG_ON(ETH_ALEN != sizeof(ddi->mac_address));
d_printf(2, dev, "GET DEVICE INFO: mac addr "
"%02x:%02x:%02x:%02x:%02x:%02x\n",
ddi->mac_address[0], ddi->mac_address[1],
ddi->mac_address[2], ddi->mac_address[3],
ddi->mac_address[4], ddi->mac_address[5]);
if (!memcmp(net_dev->perm_addr, ddi->mac_address,
sizeof(ddi->mac_address)))
goto ok;
dev_warn(dev, "warning: device reports a different MAC address "
"to that of boot mode's\n");
dev_warn(dev, "device reports %02x:%02x:%02x:%02x:%02x:%02x\n",
ddi->mac_address[0], ddi->mac_address[1],
ddi->mac_address[2], ddi->mac_address[3],
ddi->mac_address[4], ddi->mac_address[5]);
dev_warn(dev, "boot mode reported %02x:%02x:%02x:%02x:%02x:%02x\n",
net_dev->perm_addr[0], net_dev->perm_addr[1],
net_dev->perm_addr[2], net_dev->perm_addr[3],
net_dev->perm_addr[4], net_dev->perm_addr[5]);
if (!memcmp(zeromac, ddi->mac_address, sizeof(zeromac)))
dev_err(dev, "device reports an invalid MAC address, "
"not updating\n");
else {
dev_warn(dev, "updating MAC address\n");
net_dev->addr_len = ETH_ALEN;
memcpy(net_dev->perm_addr, ddi->mac_address, ETH_ALEN);
memcpy(net_dev->dev_addr, ddi->mac_address, ETH_ALEN);
}
ok:
result = 0;
kfree_skb(skb);
error:
d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
return result;
}
/**
* __i2400m_dev_start - Bring up driver communication with the device
*
* @i2400m: device descriptor
* @flags: boot mode flags
*
* Returns: 0 if ok, < 0 errno code on error.
*
* Uploads firmware and brings up all the resources needed to be able
* to communicate with the device.
*
* TX needs to be setup before the bus-specific code (otherwise on
* shutdown, the bus-tx code could try to access it).
*/
static
int __i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri flags)
{
int result;
struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
struct net_device *net_dev = wimax_dev->net_dev;
struct device *dev = i2400m_dev(i2400m);
int times = 3;
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
retry:
result = i2400m_dev_bootstrap(i2400m, flags);
if (result < 0) {
dev_err(dev, "cannot bootstrap device: %d\n", result);
goto error_bootstrap;
}
result = i2400m_tx_setup(i2400m);
if (result < 0)
goto error_tx_setup;
wimax/i2400m: implement RX reorder support Allow the device to give the driver RX data with reorder information. When that is done, the device will indicate the driver if a packet has to be held in a (sorted) queue. It will also tell the driver when held packets have to be released to the OS. This is done to improve the WiMAX-protocol level retransmission support when missing frames are detected. The code docs provide details about the implementation. In general, this just hooks into the RX path in rx.c; if a packet with the reorder bit in the RX header is detected, the reorder information in the header is extracted and one of the four main reorder operations are executed. In one case (queue) no packet will be delivered to the networking stack, just queued, whereas in the others (reset, update_ws and queue_update_ws), queued packet might be delivered depending on the window start for the specific queue. The modifications to files other than rx.c are: - control.c: during device initialization, enable reordering support if the rx_reorder_disabled module parameter is not enabled - driver.c: expose a rx_reorder_disable module parameter and call i2400m_rx_setup/release() to initialize/shutdown RX reorder support. - i2400m.h: introduce members in 'struct i2400m' needed for implementing reorder support. - linux/i2400m.h: introduce TLVs, commands and constant definitions related to RX reorder Last but not least, the rx reorder code includes an small circular log where the last N reorder operations are recorded to be displayed in case of inconsistency. Otherwise diagnosing issues would be almost impossible. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-01 07:42:54 +08:00
result = i2400m_rx_setup(i2400m);
if (result < 0)
goto error_rx_setup;
result = i2400m->bus_dev_start(i2400m);
if (result < 0)
goto error_bus_dev_start;
i2400m->work_queue = create_singlethread_workqueue(wimax_dev->name);
if (i2400m->work_queue == NULL) {
result = -ENOMEM;
dev_err(dev, "cannot create workqueue\n");
goto error_create_workqueue;
}
result = i2400m_firmware_check(i2400m); /* fw versions ok? */
if (result < 0)
goto error_fw_check;
/* At this point is ok to send commands to the device */
result = i2400m_check_mac_addr(i2400m);
if (result < 0)
goto error_check_mac_addr;
i2400m->ready = 1;
wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED);
result = i2400m_dev_initialize(i2400m);
if (result < 0)
goto error_dev_initialize;
/* At this point, reports will come for the device and set it
* to the right state if it is different than UNINITIALIZED */
d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n",
net_dev, i2400m, result);
return result;
error_dev_initialize:
error_check_mac_addr:
error_fw_check:
destroy_workqueue(i2400m->work_queue);
error_create_workqueue:
i2400m->bus_dev_stop(i2400m);
error_bus_dev_start:
wimax/i2400m: implement RX reorder support Allow the device to give the driver RX data with reorder information. When that is done, the device will indicate the driver if a packet has to be held in a (sorted) queue. It will also tell the driver when held packets have to be released to the OS. This is done to improve the WiMAX-protocol level retransmission support when missing frames are detected. The code docs provide details about the implementation. In general, this just hooks into the RX path in rx.c; if a packet with the reorder bit in the RX header is detected, the reorder information in the header is extracted and one of the four main reorder operations are executed. In one case (queue) no packet will be delivered to the networking stack, just queued, whereas in the others (reset, update_ws and queue_update_ws), queued packet might be delivered depending on the window start for the specific queue. The modifications to files other than rx.c are: - control.c: during device initialization, enable reordering support if the rx_reorder_disabled module parameter is not enabled - driver.c: expose a rx_reorder_disable module parameter and call i2400m_rx_setup/release() to initialize/shutdown RX reorder support. - i2400m.h: introduce members in 'struct i2400m' needed for implementing reorder support. - linux/i2400m.h: introduce TLVs, commands and constant definitions related to RX reorder Last but not least, the rx reorder code includes an small circular log where the last N reorder operations are recorded to be displayed in case of inconsistency. Otherwise diagnosing issues would be almost impossible. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-01 07:42:54 +08:00
i2400m_rx_release(i2400m);
error_rx_setup:
i2400m_tx_release(i2400m);
error_tx_setup:
error_bootstrap:
if (result == -ERESTARTSYS && times-- > 0) {
flags = I2400M_BRI_SOFT;
goto retry;
}
d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n",
net_dev, i2400m, result);
return result;
}
static
int i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri bm_flags)
{
int result;
mutex_lock(&i2400m->init_mutex); /* Well, start the device */
result = __i2400m_dev_start(i2400m, bm_flags);
if (result >= 0)
i2400m->updown = 1;
mutex_unlock(&i2400m->init_mutex);
return result;
}
/**
* i2400m_dev_stop - Tear down driver communication with the device
*
* @i2400m: device descriptor
*
* Returns: 0 if ok, < 0 errno code on error.
*
* Releases all the resources allocated to communicate with the device.
*/
static
void __i2400m_dev_stop(struct i2400m *i2400m)
{
struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
struct device *dev = i2400m_dev(i2400m);
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
i2400m_dev_shutdown(i2400m);
i2400m->ready = 0;
destroy_workqueue(i2400m->work_queue);
i2400m->bus_dev_stop(i2400m);
wimax/i2400m: implement RX reorder support Allow the device to give the driver RX data with reorder information. When that is done, the device will indicate the driver if a packet has to be held in a (sorted) queue. It will also tell the driver when held packets have to be released to the OS. This is done to improve the WiMAX-protocol level retransmission support when missing frames are detected. The code docs provide details about the implementation. In general, this just hooks into the RX path in rx.c; if a packet with the reorder bit in the RX header is detected, the reorder information in the header is extracted and one of the four main reorder operations are executed. In one case (queue) no packet will be delivered to the networking stack, just queued, whereas in the others (reset, update_ws and queue_update_ws), queued packet might be delivered depending on the window start for the specific queue. The modifications to files other than rx.c are: - control.c: during device initialization, enable reordering support if the rx_reorder_disabled module parameter is not enabled - driver.c: expose a rx_reorder_disable module parameter and call i2400m_rx_setup/release() to initialize/shutdown RX reorder support. - i2400m.h: introduce members in 'struct i2400m' needed for implementing reorder support. - linux/i2400m.h: introduce TLVs, commands and constant definitions related to RX reorder Last but not least, the rx reorder code includes an small circular log where the last N reorder operations are recorded to be displayed in case of inconsistency. Otherwise diagnosing issues would be almost impossible. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-01 07:42:54 +08:00
i2400m_rx_release(i2400m);
i2400m_tx_release(i2400m);
wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
d_fnend(3, dev, "(i2400m %p) = 0\n", i2400m);
}
/*
* Watch out -- we only need to stop if there is a need for it. The
* device could have reset itself and failed to come up again (see
* _i2400m_dev_reset_handle()).
*/
static
void i2400m_dev_stop(struct i2400m *i2400m)
{
mutex_lock(&i2400m->init_mutex);
if (i2400m->updown) {
__i2400m_dev_stop(i2400m);
i2400m->updown = 0;
}
mutex_unlock(&i2400m->init_mutex);
}
/*
* The device has rebooted; fix up the device and the driver
*
* Tear down the driver communication with the device, reload the
* firmware and reinitialize the communication with the device.
*
* If someone calls a reset when the device's firmware is down, in
* theory we won't see it because we are not listening. However, just
* in case, leave the code to handle it.
*
* If there is a reset context, use it; this means someone is waiting
* for us to tell him when the reset operation is complete and the
* device is ready to rock again.
*
* NOTE: if we are in the process of bringing up or down the
* communication with the device [running i2400m_dev_start() or
* _stop()], don't do anything, let it fail and handle it.
*
* This function is ran always in a thread context
*/
static
void __i2400m_dev_reset_handle(struct work_struct *ws)
{
int result;
struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws);
struct i2400m *i2400m = iw->i2400m;
struct device *dev = i2400m_dev(i2400m);
enum wimax_st wimax_state;
struct i2400m_reset_ctx *ctx = i2400m->reset_ctx;
d_fnstart(3, dev, "(ws %p i2400m %p)\n", ws, i2400m);
result = 0;
if (mutex_trylock(&i2400m->init_mutex) == 0) {
/* We are still in i2400m_dev_start() [let it fail] or
* i2400m_dev_stop() [we are shutting down anyway, so
* ignore it] or we are resetting somewhere else. */
dev_err(dev, "device rebooted\n");
i2400m_msg_to_dev_cancel_wait(i2400m, -ERESTARTSYS);
complete(&i2400m->msg_completion);
goto out;
}
wimax_state = wimax_state_get(&i2400m->wimax_dev);
if (wimax_state < WIMAX_ST_UNINITIALIZED) {
dev_info(dev, "device rebooted: it is down, ignoring\n");
goto out_unlock; /* ifconfig up/down wasn't called */
}
dev_err(dev, "device rebooted: reinitializing driver\n");
__i2400m_dev_stop(i2400m);
i2400m->updown = 0;
result = __i2400m_dev_start(i2400m,
I2400M_BRI_SOFT | I2400M_BRI_MAC_REINIT);
if (result < 0) {
dev_err(dev, "device reboot: cannot start the device: %d\n",
result);
result = i2400m->bus_reset(i2400m, I2400M_RT_BUS);
if (result >= 0)
result = -ENODEV;
} else
i2400m->updown = 1;
out_unlock:
if (i2400m->reset_ctx) {
ctx->result = result;
complete(&ctx->completion);
}
mutex_unlock(&i2400m->init_mutex);
out:
i2400m_put(i2400m);
kfree(iw);
d_fnend(3, dev, "(ws %p i2400m %p) = void\n", ws, i2400m);
return;
}
/**
* i2400m_dev_reset_handle - Handle a device's reset in a thread context
*
* Schedule a device reset handling out on a thread context, so it
* is safe to call from atomic context. We can't use the i2400m's
* queue as we are going to destroy it and reinitialize it as part of
* the driver bringup/bringup process.
*
* See __i2400m_dev_reset_handle() for details; that takes care of
* reinitializing the driver to handle the reset, calling into the
* bus-specific functions ops as needed.
*/
int i2400m_dev_reset_handle(struct i2400m *i2400m)
{
return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle,
GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle);
/**
* i2400m_setup - bus-generic setup function for the i2400m device
*
* @i2400m: device descriptor (bus-specific parts have been initialized)
*
* Returns: 0 if ok, < 0 errno code on error.
*
* Initializes the bus-generic parts of the i2400m driver; the
* bus-specific parts have been initialized, function pointers filled
* out by the bus-specific probe function.
*
* As well, this registers the WiMAX and net device nodes. Once this
* function returns, the device is operative and has to be ready to
* receive and send network traffic and WiMAX control operations.
*/
int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
{
int result = -ENODEV;
struct device *dev = i2400m_dev(i2400m);
struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
snprintf(wimax_dev->name, sizeof(wimax_dev->name),
"i2400m-%s:%s", dev->bus->name, dev_name(dev));
i2400m->bm_cmd_buf = kzalloc(I2400M_BM_CMD_BUF_SIZE, GFP_KERNEL);
if (i2400m->bm_cmd_buf == NULL) {
dev_err(dev, "cannot allocate USB command buffer\n");
goto error_bm_cmd_kzalloc;
}
i2400m->bm_ack_buf = kzalloc(I2400M_BM_ACK_BUF_SIZE, GFP_KERNEL);
if (i2400m->bm_ack_buf == NULL) {
dev_err(dev, "cannot allocate USB ack buffer\n");
goto error_bm_ack_buf_kzalloc;
}
result = i2400m_bootrom_init(i2400m, bm_flags);
if (result < 0) {
dev_err(dev, "read mac addr: bootrom init "
"failed: %d\n", result);
goto error_bootrom_init;
}
result = i2400m_read_mac_addr(i2400m);
if (result < 0)
goto error_read_mac_addr;
random_ether_addr(i2400m->src_mac_addr);
result = register_netdev(net_dev); /* Okey dokey, bring it up */
if (result < 0) {
dev_err(dev, "cannot register i2400m network device: %d\n",
result);
goto error_register_netdev;
}
netif_carrier_off(net_dev);
result = i2400m_dev_start(i2400m, bm_flags);
if (result < 0)
goto error_dev_start;
i2400m->wimax_dev.op_msg_from_user = i2400m_op_msg_from_user;
i2400m->wimax_dev.op_rfkill_sw_toggle = i2400m_op_rfkill_sw_toggle;
i2400m->wimax_dev.op_reset = i2400m_op_reset;
result = wimax_dev_add(&i2400m->wimax_dev, net_dev);
if (result < 0)
goto error_wimax_dev_add;
/* User space needs to do some init stuff */
wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED);
/* Now setup all that requires a registered net and wimax device. */
result = sysfs_create_group(&net_dev->dev.kobj, &i2400m_dev_attr_group);
if (result < 0) {
dev_err(dev, "cannot setup i2400m's sysfs: %d\n", result);
goto error_sysfs_setup;
}
result = i2400m_debugfs_add(i2400m);
if (result < 0) {
dev_err(dev, "cannot setup i2400m's debugfs: %d\n", result);
goto error_debugfs_setup;
}
d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
return result;
error_debugfs_setup:
sysfs_remove_group(&i2400m->wimax_dev.net_dev->dev.kobj,
&i2400m_dev_attr_group);
error_sysfs_setup:
wimax_dev_rm(&i2400m->wimax_dev);
error_wimax_dev_add:
i2400m_dev_stop(i2400m);
error_dev_start:
unregister_netdev(net_dev);
error_register_netdev:
error_read_mac_addr:
error_bootrom_init:
kfree(i2400m->bm_ack_buf);
error_bm_ack_buf_kzalloc:
kfree(i2400m->bm_cmd_buf);
error_bm_cmd_kzalloc:
d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
return result;
}
EXPORT_SYMBOL_GPL(i2400m_setup);
/**
* i2400m_release - release the bus-generic driver resources
*
* Sends a disconnect message and undoes any setup done by i2400m_setup()
*/
void i2400m_release(struct i2400m *i2400m)
{
struct device *dev = i2400m_dev(i2400m);
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
netif_stop_queue(i2400m->wimax_dev.net_dev);
i2400m_debugfs_rm(i2400m);
sysfs_remove_group(&i2400m->wimax_dev.net_dev->dev.kobj,
&i2400m_dev_attr_group);
wimax_dev_rm(&i2400m->wimax_dev);
i2400m_dev_stop(i2400m);
unregister_netdev(i2400m->wimax_dev.net_dev);
kfree(i2400m->bm_ack_buf);
kfree(i2400m->bm_cmd_buf);
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}
EXPORT_SYMBOL_GPL(i2400m_release);
/*
* Debug levels control; see debug.h
*/
struct d_level D_LEVEL[] = {
D_SUBMODULE_DEFINE(control),
D_SUBMODULE_DEFINE(driver),
D_SUBMODULE_DEFINE(debugfs),
D_SUBMODULE_DEFINE(fw),
D_SUBMODULE_DEFINE(netdev),
D_SUBMODULE_DEFINE(rfkill),
D_SUBMODULE_DEFINE(rx),
D_SUBMODULE_DEFINE(tx),
};
size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
static
int __init i2400m_driver_init(void)
{
return 0;
}
module_init(i2400m_driver_init);
static
void __exit i2400m_driver_exit(void)
{
/* for scheds i2400m_dev_reset_handle() */
flush_scheduled_work();
return;
}
module_exit(i2400m_driver_exit);
MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
MODULE_DESCRIPTION("Intel 2400M WiMAX networking bus-generic driver");
MODULE_LICENSE("GPL");