- 根目录:
- drivers
- net
- wimax
- i2400m
- usb-fw.c
/*
* Intel Wireless WiMAX Connection 2400m
* Firmware uploader's USB specifics
*
*
* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* Intel Corporation <linux-wimax@intel.com>
* Yanir Lubetkin <yanirx.lubetkin@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* - Initial implementation
*
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* - bus generic/specific split
*
* THE PROCEDURE
*
* See fw.c for the generic description of this procedure.
*
* This file implements only the USB specifics. It boils down to how
* to send a command and waiting for an acknowledgement from the
* device.
*
* This code (and process) is single threaded. It assumes it is the
* only thread poking around (guaranteed by fw.c).
*
* COMMAND EXECUTION
*
* A write URB is posted with the buffer to the bulk output endpoint.
*
* ACK RECEPTION
*
* We just post a URB to the notification endpoint and wait for
* data. We repeat until we get all the data we expect (as indicated
* by the call from the bus generic code).
*
* The data is not read from the bulk in endpoint for boot mode.
*
* ROADMAP
*
* i2400mu_bus_bm_cmd_send
* i2400m_bm_cmd_prepare...
* i2400mu_tx_bulk_out
*
* i2400mu_bus_bm_wait_for_ack
* i2400m_notif_submit
*/
#include <linux/usb.h>
#include <linux/gfp.h>
#include "i2400m-usb.h"
#define D_SUBMODULE fw
#include "usb-debug-levels.h"
/*
* Synchronous write to the device
*
* Takes care of updating EDC counts and thus, handle device errors.
*/
static
ssize_t i2400mu_tx_bulk_out(struct i2400mu *i2400mu, void *buf, size_t buf_size)
{
int result;
struct device *dev = &i2400mu->usb_iface->dev;
int len;
struct usb_endpoint_descriptor *epd;
int pipe, do_autopm = 1;
result = usb_autopm_get_interface(i2400mu->usb_iface);
if (result < 0) {
dev_err(dev, "BM-CMD: can't get autopm: %d\n", result);
do_autopm = 0;
}
epd = usb_get_epd(i2400mu->usb_iface, i2400mu->endpoint_cfg.bulk_out);
pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
retry:
result = usb_bulk_msg(i2400mu->usb_dev, pipe, buf, buf_size, &len, 200);
switch (result) {
case 0:
if (len != buf_size) {
dev_err(dev, "BM-CMD: short write (%u B vs %zu "
"expected)\n", len, buf_size);
result = -EIO;
break;
}
result = len;
break;
case -EPIPE:
/*
* Stall -- maybe the device is choking with our
* requests. Clear it and give it some time. If they
* happen to often, it might be another symptom, so we
* reset.
*
* No error handling for usb_clear_halt(0; if it
* works, the retry works; if it fails, this switch
* does the error handling for us.
*/
if (edc_inc(&i2400mu->urb_edc,
10 * EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "BM-CMD: too many stalls in "
"URB; resetting device\n");
usb_queue_reset_device(i2400mu->usb_iface);
/* fallthrough */
} else {
usb_clear_halt(i2400mu->usb_dev, pipe);
msleep(10); /* give the device some time */
goto retry;
}
case -EINVAL: /* while removing driver */
case -ENODEV: /* dev disconnect ... */
case -ENOENT: /* just ignore it */
case -ESHUTDOWN: /* and exit */
case -ECONNRESET:
result = -ESHUTDOWN;
break;
case -ETIMEDOUT: /* bah... */
break;
default: /* any other? */
if (edc_inc(&i2400mu->urb_edc,
EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "BM-CMD: maximum errors in "
"URB exceeded; resetting device\n");
usb_queue_reset_device(i2400mu->usb_iface);
result = -ENODEV;
break;
}
dev_err(dev, "BM-CMD: URB error %d, retrying\n",
result);
goto retry;
}
if (do_autopm)
usb_autopm_put_interface(i2400mu->usb_iface);
return result;
}
/*
* Send a boot-mode command over the bulk-out pipe
*
* Command can be a raw command, which requires no preparation (and
* which might not even be following the command format). Checks that
* the right amount of data was transferred.
*
* To satisfy USB requirements (no onstack, vmalloc or in data segment
* buffers), we copy the command to i2400m->bm_cmd_buf and send it from
* there.
*
* @flags: pass thru from i2400m_bm_cmd()
* @return: cmd_size if ok, < 0 errno code on error.
*/
ssize_t i2400mu_bus_bm_cmd_send(struct i2400m *i2400m,
const struct i2400m_bootrom_header *_cmd,
size_t cmd_size, int flags)
{
ssize_t result;
struct device *dev = i2400m_dev(i2400m);
struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
struct i2400m_bootrom_header *cmd;
size_t cmd_size_a = ALIGN(cmd_size, 16); /* USB restriction */
d_fnstart(8, dev, "(i2400m %p cmd %p size %zu)\n",
i2400m, _cmd, cmd_size);
result = -E2BIG;
if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
goto error_too_big;
if (_cmd != i2400m->bm_cmd_buf)
memmove(i2400m->bm_cmd_buf, _cmd, cmd_size);
cmd = i2400m->bm_cmd_buf;
if (cmd_size_a > cmd_size) /* Zero pad space */
memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
if ((flags & I2400M_BM_CMD_RAW) == 0) {
if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
dev_warn(dev, "SW BUG: response_required == 0\n");
i2400m_bm_cmd_prepare(cmd);
}
result = i2400mu_tx_bulk_out(i2400mu, i2400m->bm_cmd_buf, cmd_size);
if (result < 0) {
dev_err(dev, "boot-mode cmd %d: cannot send: %zd\n",
opcode, result);
goto error_cmd_send;
}
if (result != cmd_size) { /* all was transferred? */
dev_err(dev, "boot-mode cmd %d: incomplete transfer "
"(%zd vs %zu submitted)\n", opcode, result, cmd_size);
result = -EIO;
goto error_cmd_size;
}
error_cmd_size:
error_cmd_send:
error_too_big:
d_fnend(8, dev, "(i2400m %p cmd %p size %zu) = %zd\n",
i2400m, _cmd, cmd_size, result);
return result;
}
static
void __i2400mu_bm_notif_cb(struct urb *urb)
{
complete(urb->context);
}
/*
* submit a read to the notification endpoint
*
* @i2400m: device descriptor
* @urb: urb to use
* @completion: completion varible to complete when done
*
* Data is always read to i2400m->bm_ack_buf
*/
static
int i2400mu_notif_submit(struct i2400mu *i2400mu, struct urb *urb,
struct completion *completion)
{
struct i2400m *i2400m = &i2400mu->i2400m;
struct usb_endpoint_descriptor *epd;
int pipe;
epd = usb_get_epd(i2400mu->usb_iface,
i2400mu->endpoint_cfg.notification);
pipe = usb_rcvintpipe(i2400mu->usb_dev, epd->bEndpointAddress);
usb_fill_int_urb(urb, i2400mu->usb_dev, pipe,
i2400m->bm_ack_buf, I2400M_BM_ACK_BUF_SIZE,
__i2400mu_bm_notif_cb, completion,
epd->bInterval);
return usb_submit_urb(urb, GFP_KERNEL);
}
/*
* Read an ack from the notification endpoint
*
* @i2400m:
* @_ack: pointer to where to store the read data
* @ack_size: how many bytes we should read
*
* Returns: < 0 errno code on error; otherwise, amount of received bytes.
*
* Submits a notification read, appends the read data to the given ack
* buffer and then repeats (until @ack_size bytes have been
* received).
*/
ssize_t i2400mu_bus_bm_wait_for_ack(struct i2400m *i2400m,
struct i2400m_bootrom_header *_ack,
size_t ack_size)
{
ssize_t result = -ENOMEM;
struct device *dev = i2400m_dev(i2400m);
struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
struct urb notif_urb;
void *ack = _ack;
size_t offset, len;
long val;
int do_autopm = 1;
DECLARE_COMPLETION_ONSTACK(notif_completion);
d_fnstart(8, dev, "(i2400m %p ack %p size %zu)\n",
i2400m, ack, ack_size);
BUG_ON(_ack == i2400m->bm_ack_buf);
result = usb_autopm_get_interface(i2400mu->usb_iface);
if (result < 0) {
dev_err(dev, "BM-ACK: can't get autopm: %d\n", (int) result);
do_autopm = 0;
}
usb_init_urb(¬if_urb); /* ready notifications */
usb_get_urb(¬if_urb);
offset = 0;
while (offset < ack_size) {
init_completion(¬if_completion);
result = i2400mu_notif_submit(i2400mu, ¬if_urb,
¬if_completion);
if (result < 0)
goto error_notif_urb_submit;
val = wait_for_completion_interruptible_timeout(
¬if_completion, HZ);
if (val == 0) {
result = -ETIMEDOUT;
usb_kill_urb(¬if_urb); /* Timedout */
goto error_notif_wait;
}
if (val == -ERESTARTSYS) {
result = -EINTR; /* Interrupted */
usb_kill_urb(¬if_urb);
goto error_notif_wait;
}
result = notif_urb.status; /* How was the ack? */
switch (result) {
case 0:
break;
case -EINVAL: /* while removing driver */
case -ENODEV: /* dev disconnect ... */
case -ENOENT: /* just ignore it */
case -ESHUTDOWN: /* and exit */
case -ECONNRESET:
result = -ESHUTDOWN;
goto error_dev_gone;
default: /* any other? */
usb_kill_urb(¬if_urb); /* Timedout */
if (edc_inc(&i2400mu->urb_edc,
EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME))
goto error_exceeded;
dev_err(dev, "BM-ACK: URB error %d, "
"retrying\n", notif_urb.status);
continue; /* retry */
}
if (notif_urb.actual_length == 0) {
d_printf(6, dev, "ZLP received, retrying\n");
continue;
}
/* Got data, append it to the buffer */
len = min(ack_size - offset, (size_t) notif_urb.actual_length);
memcpy(ack + offset, i2400m->bm_ack_buf, len);
offset += len;
}
result = offset;
error_notif_urb_submit:
error_notif_wait:
error_dev_gone:
out:
if (do_autopm)
usb_autopm_put_interface(i2400mu->usb_iface);
d_fnend(8, dev, "(i2400m %p ack %p size %zu) = %ld\n",
i2400m, ack, ack_size, (long) result);
return result;
error_exceeded:
dev_err(dev, "bm: maximum errors in notification URB exceeded; "
"resetting device\n");
usb_queue_reset_device(i2400mu->usb_iface);
goto out;
}