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|
/*
* Intel Wireless WiMAX Connection 2400m
* Linux driver model glue for USB device, reset & fw upload
*
*
* Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* Yanir Lubetkin <yanirx.lubetkin@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-usb.h for a general description of this driver.
*
* This file implements driver model glue, and hook ups for the
* generic driver to implement the bus-specific functions (device
* communication setup/tear down, firmware upload and resetting).
*
* ROADMAP
*
* i2400mu_probe()
* alloc_netdev()...
* i2400mu_netdev_setup()
* i2400mu_init()
* i2400m_netdev_setup()
* i2400m_setup()...
*
* i2400mu_disconnect
* i2400m_release()
* free_netdev()
*
* i2400mu_suspend()
* i2400m_cmd_enter_powersave()
* i2400mu_notification_release()
*
* i2400mu_resume()
* i2400mu_notification_setup()
*
* i2400mu_bus_dev_start() Called by i2400m_dev_start() [who is
* i2400mu_tx_setup() called by i2400m_setup()]
* i2400mu_rx_setup()
* i2400mu_notification_setup()
*
* i2400mu_bus_dev_stop() Called by i2400m_dev_stop() [who is
* i2400mu_notification_release() called by i2400m_release()]
* i2400mu_rx_release()
* i2400mu_tx_release()
*
* i2400mu_bus_reset() Called by i2400m_reset
* __i2400mu_reset()
* __i2400mu_send_barker()
* usb_reset_device()
*/
#include "i2400m-usb.h"
#include <linux/wimax/i2400m.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#define D_SUBMODULE usb
#include "usb-debug-levels.h"
static char i2400mu_debug_params[128];
module_param_string(debug, i2400mu_debug_params, sizeof(i2400mu_debug_params),
0644);
MODULE_PARM_DESC(debug,
"String of space-separated NAME:VALUE pairs, where NAMEs "
"are the different debug submodules and VALUE are the "
"initial debug value to set.");
/* Our firmware file name */
static const char *i2400mu_bus_fw_names_5x50[] = {
#define I2400MU_FW_FILE_NAME_v1_5 "i2400m-fw-usb-1.5.sbcf"
I2400MU_FW_FILE_NAME_v1_5,
#define I2400MU_FW_FILE_NAME_v1_4 "i2400m-fw-usb-1.4.sbcf"
I2400MU_FW_FILE_NAME_v1_4,
NULL,
};
static const char *i2400mu_bus_fw_names_6050[] = {
#define I6050U_FW_FILE_NAME_v1_5 "i6050-fw-usb-1.5.sbcf"
I6050U_FW_FILE_NAME_v1_5,
NULL,
};
static
int i2400mu_bus_dev_start(struct i2400m *i2400m)
{
int result;
struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
struct device *dev = &i2400mu->usb_iface->dev;
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
result = i2400mu_tx_setup(i2400mu);
if (result < 0)
goto error_usb_tx_setup;
result = i2400mu_rx_setup(i2400mu);
if (result < 0)
goto error_usb_rx_setup;
result = i2400mu_notification_setup(i2400mu);
if (result < 0)
goto error_notif_setup;
d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
return result;
error_notif_setup:
i2400mu_rx_release(i2400mu);
error_usb_rx_setup:
i2400mu_tx_release(i2400mu);
error_usb_tx_setup:
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
return result;
}
static
void i2400mu_bus_dev_stop(struct i2400m *i2400m)
{
struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
struct device *dev = &i2400mu->usb_iface->dev;
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
i2400mu_notification_release(i2400mu);
i2400mu_rx_release(i2400mu);
i2400mu_tx_release(i2400mu);
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}
/*
* Sends a barker buffer to the device
*
* This helper will allocate a kmalloced buffer and use it to transmit
* (then free it). Reason for this is that other arches cannot use
* stack/vmalloc/text areas for DMA transfers.
*
* Error recovery here is simpler: anything is considered a hard error
* and will move the reset code to use a last-resort bus-based reset.
*/
static
int __i2400mu_send_barker(struct i2400mu *i2400mu,
const __le32 *barker,
size_t barker_size,
unsigned endpoint)
{
struct usb_endpoint_descriptor *epd = NULL;
int pipe, actual_len, ret;
struct device *dev = &i2400mu->usb_iface->dev;
void *buffer;
int do_autopm = 1;
ret = usb_autopm_get_interface(i2400mu->usb_iface);
if (ret < 0) {
dev_err(dev, "RESET: can't get autopm: %d\n", ret);
do_autopm = 0;
}
ret = -ENOMEM;
buffer = kmalloc(barker_size, GFP_KERNEL);
if (buffer == NULL)
goto error_kzalloc;
epd = usb_get_epd(i2400mu->usb_iface, endpoint);
pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
memcpy(buffer, barker, barker_size);
retry:
ret = usb_bulk_msg(i2400mu->usb_dev, pipe, buffer, barker_size,
&actual_len, 200);
switch (ret) {
case 0:
if (actual_len != barker_size) { /* Too short? drop it */
dev_err(dev, "E: %s: short write (%d B vs %zu "
"expected)\n",
__func__, actual_len, barker_size);
ret = -EIO;
}
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, "E: %s: too many stalls in "
"URB; resetting device\n", __func__);
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:
ret = -ESHUTDOWN;
break;
default: /* Some error? */
if (edc_inc(&i2400mu->urb_edc,
EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "E: %s: maximum errors in URB "
"exceeded; resetting device\n",
__func__);
usb_queue_reset_device(i2400mu->usb_iface);
} else {
dev_warn(dev, "W: %s: cannot send URB: %d\n",
|