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i2400m/USB: firmware upload backend
This implements the backends for the generic driver (i2400m) to be able to load firmware to the USB device. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Inaky Perez-Gonzalez
Greg Kroah-Hartman
parent
f398e4240f
commit
795038107b
340
drivers/net/wimax/i2400m/usb-fw.c
Normal file
340
drivers/net/wimax/i2400m/usb-fw.c
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@ -0,0 +1,340 @@
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/*
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* Intel Wireless WiMAX Connection 2400m
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* Firmware uploader's USB specifics
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*
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*
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* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* Intel Corporation <linux-wimax@intel.com>
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* Yanir Lubetkin <yanirx.lubetkin@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* - Initial implementation
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*
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* - bus generic/specific split
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*
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* THE PROCEDURE
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*
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* See fw.c for the generic description of this procedure.
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*
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* This file implements only the USB specifics. It boils down to how
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* to send a command and waiting for an acknowledgement from the
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* device.
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*
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* This code (and process) is single threaded. It assumes it is the
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* only thread poking around (guaranteed by fw.c).
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*
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* COMMAND EXECUTION
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*
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* A write URB is posted with the buffer to the bulk output endpoint.
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*
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* ACK RECEPTION
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*
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* We just post a URB to the notification endpoint and wait for
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* data. We repeat until we get all the data we expect (as indicated
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* by the call from the bus generic code).
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*
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* The data is not read from the bulk in endpoint for boot mode.
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*
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* ROADMAP
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*
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* i2400mu_bus_bm_cmd_send
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* i2400m_bm_cmd_prepare...
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* i2400mu_tx_bulk_out
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*
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* i2400mu_bus_bm_wait_for_ack
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* i2400m_notif_submit
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*/
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#include <linux/usb.h>
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#include "i2400m-usb.h"
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#define D_SUBMODULE fw
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#include "usb-debug-levels.h"
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/*
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* Synchronous write to the device
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*
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* Takes care of updating EDC counts and thus, handle device errors.
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*/
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static
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ssize_t i2400mu_tx_bulk_out(struct i2400mu *i2400mu, void *buf, size_t buf_size)
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{
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int result;
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struct device *dev = &i2400mu->usb_iface->dev;
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int len;
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struct usb_endpoint_descriptor *epd;
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int pipe, do_autopm = 1;
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result = usb_autopm_get_interface(i2400mu->usb_iface);
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if (result < 0) {
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dev_err(dev, "BM-CMD: can't get autopm: %d\n", result);
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do_autopm = 0;
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}
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epd = usb_get_epd(i2400mu->usb_iface, I2400MU_EP_BULK_OUT);
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pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
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retry:
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result = usb_bulk_msg(i2400mu->usb_dev, pipe, buf, buf_size, &len, HZ);
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switch (result) {
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case 0:
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if (len != buf_size) {
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dev_err(dev, "BM-CMD: short write (%u B vs %zu "
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"expected)\n", len, buf_size);
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result = -EIO;
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break;
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}
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result = len;
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break;
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case -EINVAL: /* while removing driver */
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case -ENODEV: /* dev disconnect ... */
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case -ENOENT: /* just ignore it */
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case -ESHUTDOWN: /* and exit */
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case -ECONNRESET:
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result = -ESHUTDOWN;
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break;
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case -ETIMEDOUT: /* bah... */
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break;
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default: /* any other? */
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if (edc_inc(&i2400mu->urb_edc,
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EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
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dev_err(dev, "BM-CMD: maximum errors in "
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"URB exceeded; resetting device\n");
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usb_queue_reset_device(i2400mu->usb_iface);
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result = -ENODEV;
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break;
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}
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dev_err(dev, "BM-CMD: URB error %d, retrying\n",
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result);
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goto retry;
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}
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result = len;
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if (do_autopm)
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usb_autopm_put_interface(i2400mu->usb_iface);
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return result;
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}
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/*
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* Send a boot-mode command over the bulk-out pipe
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*
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* Command can be a raw command, which requires no preparation (and
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* which might not even be following the command format). Checks that
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* the right amount of data was transfered.
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*
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* To satisfy USB requirements (no onstack, vmalloc or in data segment
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* buffers), we copy the command to i2400m->bm_cmd_buf and send it from
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* there.
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*
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* @flags: pass thru from i2400m_bm_cmd()
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* @return: cmd_size if ok, < 0 errno code on error.
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*/
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ssize_t i2400mu_bus_bm_cmd_send(struct i2400m *i2400m,
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const struct i2400m_bootrom_header *_cmd,
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size_t cmd_size, int flags)
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{
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ssize_t result;
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struct device *dev = i2400m_dev(i2400m);
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struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
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int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
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struct i2400m_bootrom_header *cmd;
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size_t cmd_size_a = ALIGN(cmd_size, 16); /* USB restriction */
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d_fnstart(8, dev, "(i2400m %p cmd %p size %zu)\n",
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i2400m, _cmd, cmd_size);
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result = -E2BIG;
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if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
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goto error_too_big;
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memcpy(i2400m->bm_cmd_buf, _cmd, cmd_size);
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cmd = i2400m->bm_cmd_buf;
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if (cmd_size_a > cmd_size) /* Zero pad space */
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memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
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if ((flags & I2400M_BM_CMD_RAW) == 0) {
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if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
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dev_warn(dev, "SW BUG: response_required == 0\n");
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i2400m_bm_cmd_prepare(cmd);
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}
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result = i2400mu_tx_bulk_out(i2400mu, i2400m->bm_cmd_buf, cmd_size);
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if (result < 0) {
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dev_err(dev, "boot-mode cmd %d: cannot send: %zd\n",
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opcode, result);
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goto error_cmd_send;
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}
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if (result != cmd_size) { /* all was transferred? */
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dev_err(dev, "boot-mode cmd %d: incomplete transfer "
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"(%zu vs %zu submitted)\n", opcode, result, cmd_size);
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result = -EIO;
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goto error_cmd_size;
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}
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error_cmd_size:
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error_cmd_send:
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error_too_big:
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d_fnend(8, dev, "(i2400m %p cmd %p size %zu) = %zd\n",
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i2400m, _cmd, cmd_size, result);
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return result;
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}
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static
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void __i2400mu_bm_notif_cb(struct urb *urb)
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{
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complete(urb->context);
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}
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/*
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* submit a read to the notification endpoint
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*
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* @i2400m: device descriptor
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* @urb: urb to use
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* @completion: completion varible to complete when done
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*
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* Data is always read to i2400m->bm_ack_buf
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*/
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static
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int i2400mu_notif_submit(struct i2400mu *i2400mu, struct urb *urb,
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struct completion *completion)
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{
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struct i2400m *i2400m = &i2400mu->i2400m;
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struct usb_endpoint_descriptor *epd;
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int pipe;
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epd = usb_get_epd(i2400mu->usb_iface, I2400MU_EP_NOTIFICATION);
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pipe = usb_rcvintpipe(i2400mu->usb_dev, epd->bEndpointAddress);
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usb_fill_int_urb(urb, i2400mu->usb_dev, pipe,
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i2400m->bm_ack_buf, I2400M_BM_ACK_BUF_SIZE,
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__i2400mu_bm_notif_cb, completion,
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epd->bInterval);
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return usb_submit_urb(urb, GFP_KERNEL);
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}
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/*
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* Read an ack from the notification endpoint
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*
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* @i2400m:
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* @_ack: pointer to where to store the read data
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* @ack_size: how many bytes we should read
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*
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* Returns: < 0 errno code on error; otherwise, amount of received bytes.
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*
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* Submits a notification read, appends the read data to the given ack
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* buffer and then repeats (until @ack_size bytes have been
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* received).
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*/
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ssize_t i2400mu_bus_bm_wait_for_ack(struct i2400m *i2400m,
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struct i2400m_bootrom_header *_ack,
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size_t ack_size)
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{
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ssize_t result = -ENOMEM;
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struct device *dev = i2400m_dev(i2400m);
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struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
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struct urb notif_urb;
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void *ack = _ack;
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size_t offset, len;
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long val;
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int do_autopm = 1;
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DECLARE_COMPLETION_ONSTACK(notif_completion);
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d_fnstart(8, dev, "(i2400m %p ack %p size %zu)\n",
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i2400m, ack, ack_size);
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BUG_ON(_ack == i2400m->bm_ack_buf);
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result = usb_autopm_get_interface(i2400mu->usb_iface);
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if (result < 0) {
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dev_err(dev, "BM-ACK: can't get autopm: %d\n", (int) result);
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do_autopm = 0;
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}
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usb_init_urb(¬if_urb); /* ready notifications */
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usb_get_urb(¬if_urb);
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offset = 0;
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while (offset < ack_size) {
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init_completion(¬if_completion);
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result = i2400mu_notif_submit(i2400mu, ¬if_urb,
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¬if_completion);
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if (result < 0)
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goto error_notif_urb_submit;
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val = wait_for_completion_interruptible_timeout(
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¬if_completion, HZ);
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if (val == 0) {
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result = -ETIMEDOUT;
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usb_kill_urb(¬if_urb); /* Timedout */
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goto error_notif_wait;
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}
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if (val == -ERESTARTSYS) {
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result = -EINTR; /* Interrupted */
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usb_kill_urb(¬if_urb);
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goto error_notif_wait;
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}
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result = notif_urb.status; /* How was the ack? */
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switch (result) {
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case 0:
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break;
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case -EINVAL: /* while removing driver */
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case -ENODEV: /* dev disconnect ... */
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case -ENOENT: /* just ignore it */
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case -ESHUTDOWN: /* and exit */
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case -ECONNRESET:
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result = -ESHUTDOWN;
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goto error_dev_gone;
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default: /* any other? */
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usb_kill_urb(¬if_urb); /* Timedout */
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if (edc_inc(&i2400mu->urb_edc,
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EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME))
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goto error_exceeded;
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dev_err(dev, "BM-ACK: URB error %d, "
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"retrying\n", notif_urb.status);
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continue; /* retry */
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}
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if (notif_urb.actual_length == 0) {
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d_printf(6, dev, "ZLP received, retrying\n");
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continue;
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}
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/* Got data, append it to the buffer */
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len = min(ack_size - offset, (size_t) notif_urb.actual_length);
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memcpy(ack + offset, i2400m->bm_ack_buf, len);
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offset += len;
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}
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result = offset;
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error_notif_urb_submit:
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error_notif_wait:
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error_dev_gone:
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out:
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if (do_autopm)
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usb_autopm_put_interface(i2400mu->usb_iface);
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d_fnend(8, dev, "(i2400m %p ack %p size %zu) = %zd\n",
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i2400m, ack, ack_size, result);
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return result;
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error_exceeded:
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dev_err(dev, "bm: maximum errors in notification URB exceeded; "
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"resetting device\n");
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usb_queue_reset_device(i2400mu->usb_iface);
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goto out;
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}
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