+++ /dev/null
-/*
- * hdm_usb.c - Hardware dependent module for USB
- *
- * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
- *
- * 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.
- *
- * This file is licensed under GPLv2.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/usb.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/cdev.h>
-#include <linux/device.h>
-#include <linux/list.h>
-#include <linux/completion.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-#include <linux/sysfs.h>
-#include <linux/dma-mapping.h>
-#include <linux/etherdevice.h>
-#include <linux/uaccess.h>
-#include "mostcore.h"
-#include "networking.h"
-
-#define USB_MTU 512
-#define NO_ISOCHRONOUS_URB 0
-#define AV_PACKETS_PER_XACT 2
-#define BUF_CHAIN_SIZE 0xFFFF
-#define MAX_NUM_ENDPOINTS 30
-#define MAX_SUFFIX_LEN 10
-#define MAX_STRING_LEN 80
-#define MAX_BUF_SIZE 0xFFFF
-#define CEILING(x, y) (((x) + (y) - 1) / (y))
-
-#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
-#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
-#define USB_DEV_ID_INIC 0xCF18 /* PID: USB INIC */
-#define HW_RESYNC 0x0000
-/* DRCI Addresses */
-#define DRCI_REG_NI_STATE 0x0100
-#define DRCI_REG_PACKET_BW 0x0101
-#define DRCI_REG_NODE_ADDR 0x0102
-#define DRCI_REG_NODE_POS 0x0103
-#define DRCI_REG_MEP_FILTER 0x0140
-#define DRCI_REG_HASH_TBL0 0x0141
-#define DRCI_REG_HASH_TBL1 0x0142
-#define DRCI_REG_HASH_TBL2 0x0143
-#define DRCI_REG_HASH_TBL3 0x0144
-#define DRCI_REG_HW_ADDR_HI 0x0145
-#define DRCI_REG_HW_ADDR_MI 0x0146
-#define DRCI_REG_HW_ADDR_LO 0x0147
-#define DRCI_REG_BASE 0x1100
-#define DRCI_COMMAND 0x02
-#define DRCI_READ_REQ 0xA0
-#define DRCI_WRITE_REQ 0xA1
-
-/**
- * struct buf_anchor - used to create a list of pending URBs
- * @urb: pointer to USB request block
- * @clear_work_obj:
- * @list: linked list
- * @urb_completion:
- */
-struct buf_anchor {
- struct urb *urb;
- struct work_struct clear_work_obj;
- struct list_head list;
- struct completion urb_compl;
-};
-
-#define to_buf_anchor(w) container_of(w, struct buf_anchor, clear_work_obj)
-
-/**
- * struct most_dci_obj - Direct Communication Interface
- * @kobj:position in sysfs
- * @usb_device: pointer to the usb device
- */
-struct most_dci_obj {
- struct kobject kobj;
- struct usb_device *usb_device;
-};
-
-#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
-
-/**
- * struct most_dev - holds all usb interface specific stuff
- * @parent: parent object in sysfs
- * @usb_device: pointer to usb device
- * @iface: hardware interface
- * @cap: channel capabilities
- * @conf: channel configuration
- * @dci: direct communication interface of hardware
- * @hw_addr: MAC address of hardware
- * @ep_address: endpoint address table
- * @link_stat: link status of hardware
- * @description: device description
- * @suffix: suffix for channel name
- * @anchor_list_lock: locks list access
- * @padding_active: indicates channel uses padding
- * @is_channel_healthy: health status table of each channel
- * @anchor_list: list of anchored items
- * @io_mutex: synchronize I/O with disconnect
- * @link_stat_timer: timer for link status reports
- * @poll_work_obj: work for polling link status
- */
-struct most_dev {
- struct kobject *parent;
- struct usb_device *usb_device;
- struct most_interface iface;
- struct most_channel_capability *cap;
- struct most_channel_config *conf;
- struct most_dci_obj *dci;
- u8 hw_addr[6];
- u8 *ep_address;
- u16 link_stat;
- char description[MAX_STRING_LEN];
- char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
- spinlock_t anchor_list_lock[MAX_NUM_ENDPOINTS];
- bool padding_active[MAX_NUM_ENDPOINTS];
- bool is_channel_healthy[MAX_NUM_ENDPOINTS];
- struct list_head *anchor_list;
- struct mutex io_mutex;
- struct timer_list link_stat_timer;
- struct work_struct poll_work_obj;
-};
-
-#define to_mdev(d) container_of(d, struct most_dev, iface)
-#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
-
-static struct workqueue_struct *schedule_usb_work;
-static void wq_clear_halt(struct work_struct *wq_obj);
-static void wq_netinfo(struct work_struct *wq_obj);
-
-/**
- * drci_rd_reg - read a DCI register
- * @dev: usb device
- * @reg: register address
- * @buf: buffer to store data
- *
- * This is reads data from INIC's direct register communication interface
- */
-static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
-{
- int retval;
- u16 *dma_buf = kzalloc(sizeof(u16), GFP_KERNEL);
- u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
-
- if (!dma_buf)
- return -ENOMEM;
-
- retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
- DRCI_READ_REQ, req_type,
- 0x0000,
- reg, dma_buf, sizeof(u16), 5 * HZ);
- *buf = le16_to_cpu(*dma_buf);
- kfree(dma_buf);
-
- return retval;
-}
-
-/**
- * drci_wr_reg - write a DCI register
- * @dev: usb device
- * @reg: register address
- * @data: data to write
- *
- * This is writes data to INIC's direct register communication interface
- */
-static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
-{
- return usb_control_msg(dev,
- usb_sndctrlpipe(dev, 0),
- DRCI_WRITE_REQ,
- USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- data,
- reg,
- NULL,
- 0,
- 5 * HZ);
-}
-
-/**
- * free_anchored_buffers - free device's anchored items
- * @mdev: the device
- * @channel: channel ID
- */
-static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel)
-{
- struct mbo *mbo;
- struct buf_anchor *anchor, *tmp;
- unsigned long flags;
-
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_for_each_entry_safe(anchor, tmp, &mdev->anchor_list[channel],
- list) {
- struct urb *urb = anchor->urb;
-
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
- if (likely(urb)) {
- mbo = urb->context;
- if (!irqs_disabled()) {
- usb_kill_urb(urb);
- } else {
- usb_unlink_urb(urb);
- wait_for_completion(&anchor->urb_compl);
- }
- if ((mbo) && (mbo->complete)) {
- mbo->status = MBO_E_CLOSE;
- mbo->processed_length = 0;
- mbo->complete(mbo);
- }
- usb_free_urb(urb);
- }
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_del(&anchor->list);
- kfree(anchor);
- }
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
-}
-
-/**
- * get_stream_frame_size - calculate frame size of current configuration
- * @cfg: channel configuration
- */
-static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
-{
- unsigned int frame_size = 0;
- unsigned int sub_size = cfg->subbuffer_size;
-
- if (!sub_size) {
- pr_warn("Misconfig: Subbuffer size zero.\n");
- return frame_size;
- }
- switch (cfg->data_type) {
- case MOST_CH_ISOC_AVP:
- frame_size = AV_PACKETS_PER_XACT * sub_size;
- break;
- case MOST_CH_SYNC:
- if (cfg->packets_per_xact == 0) {
- pr_warn("Misconfig: Packets per XACT zero\n");
- frame_size = 0;
- } else if (cfg->packets_per_xact == 0xFF) {
- frame_size = (USB_MTU / sub_size) * sub_size;
- } else {
- frame_size = cfg->packets_per_xact * sub_size;
- }
- break;
- default:
- pr_warn("Query frame size of non-streaming channel\n");
- break;
- }
- return frame_size;
-}
-
-/**
- * hdm_poison_channel - mark buffers of this channel as invalid
- * @iface: pointer to the interface
- * @channel: channel ID
- *
- * This unlinks all URBs submitted to the HCD,
- * calls the associated completion function of the core and removes
- * them from the list.
- *
- * Returns 0 on success or error code otherwise.
- */
-static int hdm_poison_channel(struct most_interface *iface, int channel)
-{
- struct most_dev *mdev;
-
- mdev = to_mdev(iface);
- if (unlikely(!iface)) {
- dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
- return -EIO;
- }
- if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
- dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
- return -ECHRNG;
- }
-
- mdev->is_channel_healthy[channel] = false;
-
- mutex_lock(&mdev->io_mutex);
- free_anchored_buffers(mdev, channel);
- if (mdev->padding_active[channel])
- mdev->padding_active[channel] = false;
-
- if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
- del_timer_sync(&mdev->link_stat_timer);
- cancel_work_sync(&mdev->poll_work_obj);
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-}
-
-/**
- * hdm_add_padding - add padding bytes
- * @mdev: most device
- * @channel: channel ID
- * @mbo: buffer object
- *
- * This inserts the INIC hardware specific padding bytes into a streaming
- * channel's buffer
- */
-static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
-{
- struct most_channel_config *conf = &mdev->conf[channel];
- unsigned int j, num_frames, frame_size;
- u16 rd_addr, wr_addr;
-
- frame_size = get_stream_frame_size(conf);
- if (!frame_size)
- return -EIO;
- num_frames = mbo->buffer_length / frame_size;
-
- if (num_frames < 1) {
- dev_err(&mdev->usb_device->dev,
- "Missed minimal transfer unit.\n");
- return -EIO;
- }
-
- for (j = 1; j < num_frames; j++) {
- wr_addr = (num_frames - j) * USB_MTU;
- rd_addr = (num_frames - j) * frame_size;
- memmove(mbo->virt_address + wr_addr,
- mbo->virt_address + rd_addr,
- frame_size);
- }
- mbo->buffer_length = num_frames * USB_MTU;
- return 0;
-}
-
-/**
- * hdm_remove_padding - remove padding bytes
- * @mdev: most device
- * @channel: channel ID
- * @mbo: buffer object
- *
- * This takes the INIC hardware specific padding bytes off a streaming
- * channel's buffer.
- */
-static int hdm_remove_padding(struct most_dev *mdev, int channel,
- struct mbo *mbo)
-{
- unsigned int j, num_frames, frame_size;
- struct most_channel_config *const conf = &mdev->conf[channel];
-
- frame_size = get_stream_frame_size(conf);
- if (!frame_size)
- return -EIO;
- num_frames = mbo->processed_length / USB_MTU;
-
- for (j = 1; j < num_frames; j++)
- memmove(mbo->virt_address + frame_size * j,
- mbo->virt_address + USB_MTU * j,
- frame_size);
-
- mbo->processed_length = frame_size * num_frames;
- return 0;
-}
-
-/**
- * hdm_write_completion - completion function for submitted Tx URBs
- * @urb: the URB that has been completed
- *
- * This checks the status of the completed URB. In case the URB has been
- * unlinked before, it is immediately freed. On any other error the MBO
- * transfer flag is set. On success it frees allocated resources and calls
- * the completion function.
- *
- * Context: interrupt!
- */
-static void hdm_write_completion(struct urb *urb)
-{
- struct mbo *mbo;
- struct buf_anchor *anchor;
- struct most_dev *mdev;
- struct device *dev;
- unsigned int channel;
- unsigned long flags;
-
- mbo = urb->context;
- anchor = mbo->priv;
- mdev = to_mdev(mbo->ifp);
- channel = mbo->hdm_channel_id;
- dev = &mdev->usb_device->dev;
-
- if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
- (!mdev->is_channel_healthy[channel])) {
- complete(&anchor->urb_compl);
- return;
- }
-
- if (unlikely(urb->status && !(urb->status == -ENOENT ||
- urb->status == -ECONNRESET ||
- urb->status == -ESHUTDOWN))) {
- mbo->processed_length = 0;
- switch (urb->status) {
- case -EPIPE:
- dev_warn(dev, "Broken OUT pipe detected\n");
- most_stop_enqueue(&mdev->iface, channel);
- mbo->status = MBO_E_INVAL;
- usb_unlink_urb(urb);
- INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
- queue_work(schedule_usb_work, &anchor->clear_work_obj);
- return;
- case -ENODEV:
- case -EPROTO:
- mbo->status = MBO_E_CLOSE;
- break;
- default:
- mbo->status = MBO_E_INVAL;
- break;
- }
- } else {
- mbo->status = MBO_SUCCESS;
- mbo->processed_length = urb->actual_length;
- }
-
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_del(&anchor->list);
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
- kfree(anchor);
-
- if (likely(mbo->complete))
- mbo->complete(mbo);
- usb_free_urb(urb);
-}
-
-/**
- * hdm_read_completion - completion function for submitted Rx URBs
- * @urb: the URB that has been completed
- *
- * This checks the status of the completed URB. In case the URB has been
- * unlinked before it is immediately freed. On any other error the MBO transfer
- * flag is set. On success it frees allocated resources, removes
- * padding bytes -if necessary- and calls the completion function.
- *
- * Context: interrupt!
- *
- * **************************************************************************
- * Error codes returned by in urb->status
- * or in iso_frame_desc[n].status (for ISO)
- * *************************************************************************
- *
- * USB device drivers may only test urb status values in completion handlers.
- * This is because otherwise there would be a race between HCDs updating
- * these values on one CPU, and device drivers testing them on another CPU.
- *
- * A transfer's actual_length may be positive even when an error has been
- * reported. That's because transfers often involve several packets, so that
- * one or more packets could finish before an error stops further endpoint I/O.
- *
- * For isochronous URBs, the urb status value is non-zero only if the URB is
- * unlinked, the device is removed, the host controller is disabled or the total
- * transferred length is less than the requested length and the URB_SHORT_NOT_OK
- * flag is set. Completion handlers for isochronous URBs should only see
- * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
- * Individual frame descriptor status fields may report more status codes.
- *
- *
- * 0 Transfer completed successfully
- *
- * -ENOENT URB was synchronously unlinked by usb_unlink_urb
- *
- * -EINPROGRESS URB still pending, no results yet
- * (That is, if drivers see this it's a bug.)
- *
- * -EPROTO (*, **) a) bitstuff error
- * b) no response packet received within the
- * prescribed bus turn-around time
- * c) unknown USB error
- *
- * -EILSEQ (*, **) a) CRC mismatch
- * b) no response packet received within the
- * prescribed bus turn-around time
- * c) unknown USB error
- *
- * Note that often the controller hardware does not
- * distinguish among cases a), b), and c), so a
- * driver cannot tell whether there was a protocol
- * error, a failure to respond (often caused by
- * device disconnect), or some other fault.
- *
- * -ETIME (**) No response packet received within the prescribed
- * bus turn-around time. This error may instead be
- * reported as -EPROTO or -EILSEQ.
- *
- * -ETIMEDOUT Synchronous USB message functions use this code
- * to indicate timeout expired before the transfer
- * completed, and no other error was reported by HC.
- *
- * -EPIPE (**) Endpoint stalled. For non-control endpoints,
- * reset this status with usb_clear_halt().
- *
- * -ECOMM During an IN transfer, the host controller
- * received data from an endpoint faster than it
- * could be written to system memory
- *
- * -ENOSR During an OUT transfer, the host controller
- * could not retrieve data from system memory fast
- * enough to keep up with the USB data rate
- *
- * -EOVERFLOW (*) The amount of data returned by the endpoint was
- * greater than either the max packet size of the
- * endpoint or the remaining buffer size. "Babble".
- *
- * -EREMOTEIO The data read from the endpoint did not fill the
- * specified buffer, and URB_SHORT_NOT_OK was set in
- * urb->transfer_flags.
- *
- * -ENODEV Device was removed. Often preceded by a burst of
- * other errors, since the hub driver doesn't detect
- * device removal events immediately.
- *
- * -EXDEV ISO transfer only partially completed
- * (only set in iso_frame_desc[n].status, not urb->status)
- *
- * -EINVAL ISO madness, if this happens: Log off and go home
- *
- * -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
- *
- * -ESHUTDOWN The device or host controller has been disabled due
- * to some problem that could not be worked around,
- * such as a physical disconnect.
- *
- *
- * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
- * hardware problems such as bad devices (including firmware) or cables.
- *
- * (**) This is also one of several codes that different kinds of host
- * controller use to indicate a transfer has failed because of device
- * disconnect. In the interval before the hub driver starts disconnect
- * processing, devices may receive such fault reports for every request.
- *
- * See <https://www.kernel.org/doc/Documentation/usb/error-codes.txt>
- */
-static void hdm_read_completion(struct urb *urb)
-{
- struct mbo *mbo;
- struct buf_anchor *anchor;
- struct most_dev *mdev;
- struct device *dev;
- unsigned long flags;
- unsigned int channel;
-
- mbo = urb->context;
- anchor = mbo->priv;
- mdev = to_mdev(mbo->ifp);
- channel = mbo->hdm_channel_id;
- dev = &mdev->usb_device->dev;
-
- if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
- (!mdev->is_channel_healthy[channel])) {
- complete(&anchor->urb_compl);
- return;
- }
-
- if (unlikely(urb->status && !(urb->status == -ENOENT ||
- urb->status == -ECONNRESET ||
- urb->status == -ESHUTDOWN))) {
- mbo->processed_length = 0;
- switch (urb->status) {
- case -EPIPE:
- dev_warn(dev, "Broken IN pipe detected\n");
- mbo->status = MBO_E_INVAL;
- usb_unlink_urb(urb);
- INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
- queue_work(schedule_usb_work, &anchor->clear_work_obj);
- return;
- case -ENODEV:
- case -EPROTO:
- mbo->status = MBO_E_CLOSE;
- break;
- case -EOVERFLOW:
- dev_warn(dev, "Babble on IN pipe detected\n");
- default:
- mbo->status = MBO_E_INVAL;
- break;
- }
- } else {
- mbo->processed_length = urb->actual_length;
- if (!mdev->padding_active[channel]) {
- mbo->status = MBO_SUCCESS;
- } else {
- if (hdm_remove_padding(mdev, channel, mbo)) {
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- } else {
- mbo->status = MBO_SUCCESS;
- }
- }
- }
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_del(&anchor->list);
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
- kfree(anchor);
-
- if (likely(mbo->complete))
- mbo->complete(mbo);
- usb_free_urb(urb);
-}
-
-/**
- * hdm_enqueue - receive a buffer to be used for data transfer
- * @iface: interface to enqueue to
- * @channel: ID of the channel
- * @mbo: pointer to the buffer object
- *
- * This allocates a new URB and fills it according to the channel
- * that is being used for transmission of data. Before the URB is
- * submitted it is stored in the private anchor list.
- *
- * Returns 0 on success. On any error the URB is freed and a error code
- * is returned.
- *
- * Context: Could in _some_ cases be interrupt!
- */
-static int hdm_enqueue(struct most_interface *iface, int channel,
- struct mbo *mbo)
-{
- struct most_dev *mdev;
- struct buf_anchor *anchor;
- struct most_channel_config *conf;
- struct device *dev;
- int retval = 0;
- struct urb *urb;
- unsigned long flags;
- unsigned long length;
- void *virt_address;
-
- if (unlikely(!iface || !mbo))
- return -EIO;
- if (unlikely(iface->num_channels <= channel) || (channel < 0))
- return -ECHRNG;
-
- mdev = to_mdev(iface);
- conf = &mdev->conf[channel];
- dev = &mdev->usb_device->dev;
-
- if (!mdev->usb_device)
- return -ENODEV;
-
- urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
- if (!urb) {
- dev_err(dev, "Failed to allocate URB\n");
- return -ENOMEM;
- }
-
- anchor = kzalloc(sizeof(*anchor), GFP_ATOMIC);
- if (!anchor) {
- retval = -ENOMEM;
- goto _error;
- }
-
- anchor->urb = urb;
- init_completion(&anchor->urb_compl);
- mbo->priv = anchor;
-
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_add_tail(&anchor->list, &mdev->anchor_list[channel]);
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
-
- if ((mdev->padding_active[channel]) &&
- (conf->direction & MOST_CH_TX))
- if (hdm_add_padding(mdev, channel, mbo)) {
- retval = -EIO;
- goto _error_1;
- }
-
- urb->transfer_dma = mbo->bus_address;
- virt_address = mbo->virt_address;
- length = mbo->buffer_length;
-
- if (conf->direction & MOST_CH_TX) {
- usb_fill_bulk_urb(urb, mdev->usb_device,
- usb_sndbulkpipe(mdev->usb_device,
- mdev->ep_address[channel]),
- virt_address,
- length,
- hdm_write_completion,
- mbo);
- if (conf->data_type != MOST_CH_ISOC_AVP)
- urb->transfer_flags |= URB_ZERO_PACKET;
- } else {
- usb_fill_bulk_urb(urb, mdev->usb_device,
- usb_rcvbulkpipe(mdev->usb_device,
- mdev->ep_address[channel]),
- virt_address,
- length + conf->extra_len,
- hdm_read_completion,
- mbo);
- }
- urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
-
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (retval) {
- dev_err(dev, "URB submit failed with error %d.\n", retval);
- goto _error_1;
- }
- return 0;
-
-_error_1:
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_del(&anchor->list);
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
- kfree(anchor);
-_error:
- usb_free_urb(urb);
- return retval;
-}
-
-/**
- * hdm_configure_channel - receive channel configuration from core
- * @iface: interface
- * @channel: channel ID
- * @conf: structure that holds the configuration information
- */
-static int hdm_configure_channel(struct most_interface *iface, int channel,
- struct most_channel_config *conf)
-{
- unsigned int num_frames;
- unsigned int frame_size;
- unsigned int temp_size;
- unsigned int tail_space;
- struct most_dev *mdev;
- struct device *dev;
-
- mdev = to_mdev(iface);
- mdev->is_channel_healthy[channel] = true;
- dev = &mdev->usb_device->dev;
-
- if (unlikely(!iface || !conf)) {
- dev_err(dev, "Bad interface or config pointer.\n");
- return -EINVAL;
- }
- if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
- dev_err(dev, "Channel ID out of range.\n");
- return -EINVAL;
- }
- if ((!conf->num_buffers) || (!conf->buffer_size)) {
- dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
- return -EINVAL;
- }
-
- if (!(conf->data_type == MOST_CH_SYNC) &&
- !((conf->data_type == MOST_CH_ISOC_AVP) &&
- (conf->packets_per_xact != 0xFF))) {
- mdev->padding_active[channel] = false;
- goto exit;
- }
-
- mdev->padding_active[channel] = true;
- temp_size = conf->buffer_size;
-
- frame_size = get_stream_frame_size(conf);
- if ((frame_size == 0) || (frame_size > USB_MTU)) {
- dev_warn(dev, "Misconfig: frame size wrong\n");
- return -EINVAL;
- }
-
- if (conf->buffer_size % frame_size) {
- u16 tmp_val;
-
- tmp_val = conf->buffer_size / frame_size;
- conf->buffer_size = tmp_val * frame_size;
- dev_notice(dev,
- "Channel %d - rounding buffer size to %d bytes, channel config says %d bytes\n",
- channel,
- conf->buffer_size,
- temp_size);
- }
-
- num_frames = conf->buffer_size / frame_size;
- tail_space = num_frames * (USB_MTU - frame_size);
- temp_size += tail_space;
-
- /* calculate extra length to comply w/ HW padding */
- conf->extra_len = (CEILING(temp_size, USB_MTU) * USB_MTU)
- - conf->buffer_size;
-exit:
- mdev->conf[channel] = *conf;
- return 0;
-}
-
-/**
- * hdm_update_netinfo - retrieve latest networking information
- * @mdev: device interface
- *
- * This triggers the USB vendor requests to read the hardware address and
- * the current link status of the attached device.
- */
-static int hdm_update_netinfo(struct most_dev *mdev)
-{
- struct usb_device *usb_device = mdev->usb_device;
- struct device *dev = &usb_device->dev;
- u16 hi, mi, lo, link;
-
- if (!is_valid_ether_addr(mdev->hw_addr)) {
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi) < 0) {
- dev_err(dev, "Vendor request \"hw_addr_hi\" failed\n");
- return -1;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
- dev_err(dev, "Vendor request \"hw_addr_mid\" failed\n");
- return -1;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
- dev_err(dev, "Vendor request \"hw_addr_low\" failed\n");
- return -1;
- }
-
- mutex_lock(&mdev->io_mutex);
- mdev->hw_addr[0] = hi >> 8;
- mdev->hw_addr[1] = hi;
- mdev->hw_addr[2] = mi >> 8;
- mdev->hw_addr[3] = mi;
- mdev->hw_addr[4] = lo >> 8;
- mdev->hw_addr[5] = lo;
- mutex_unlock(&mdev->io_mutex);
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
- dev_err(dev, "Vendor request \"link status\" failed\n");
- return -1;
- }
-
- mutex_lock(&mdev->io_mutex);
- mdev->link_stat = link;
- mutex_unlock(&mdev->io_mutex);
- return 0;
-}
-
-/**
- * hdm_request_netinfo - request network information
- * @iface: pointer to interface
- * @channel: channel ID
- *
- * This is used as trigger to set up the link status timer that
- * polls for the NI state of the INIC every 2 seconds.
- *
- */
-static void hdm_request_netinfo(struct most_interface *iface, int channel)
-{
- struct most_dev *mdev;
-
- BUG_ON(!iface);
- mdev = to_mdev(iface);
- mdev->link_stat_timer.expires = jiffies + HZ;
- mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
-}
-
-/**
- * link_stat_timer_handler - add work to link_stat work queue
- * @data: pointer to USB device instance
- *
- * The handler runs in interrupt context. That's why we need to defer the
- * tasks to a work queue.
- */
-static void link_stat_timer_handler(unsigned long data)
-{
- struct most_dev *mdev = (struct most_dev *)data;
-
- queue_work(schedule_usb_work, &mdev->poll_work_obj);
- mdev->link_stat_timer.expires = jiffies + (2 * HZ);
- add_timer(&mdev->link_stat_timer);
-}
-
-/**
- * wq_netinfo - work queue function
- * @wq_obj: object that holds data for our deferred work to do
- *
- * This retrieves the network interface status of the USB INIC
- * and compares it with the current status. If the status has
- * changed, it updates the status of the core.
- */
-static void wq_netinfo(struct work_struct *wq_obj)
-{
- struct most_dev *mdev;
- int i, prev_link_stat;
- u8 prev_hw_addr[6];
-
- mdev = to_mdev_from_work(wq_obj);
- prev_link_stat = mdev->link_stat;
-
- for (i = 0; i < 6; i++)
- prev_hw_addr[i] = mdev->hw_addr[i];
-
- if (hdm_update_netinfo(mdev) < 0)
- return;
- if ((prev_link_stat != mdev->link_stat) ||
- (prev_hw_addr[0] != mdev->hw_addr[0]) ||
- (prev_hw_addr[1] != mdev->hw_addr[1]) ||
- (prev_hw_addr[2] != mdev->hw_addr[2]) ||
- (prev_hw_addr[3] != mdev->hw_addr[3]) ||
- (prev_hw_addr[4] != mdev->hw_addr[4]) ||
- (prev_hw_addr[5] != mdev->hw_addr[5]))
- most_deliver_netinfo(&mdev->iface, mdev->link_stat,
- &mdev->hw_addr[0]);
-}
-
-/**
- * wq_clear_halt - work queue function
- * @wq_obj: work_struct object to execute
- *
- * This sends a clear_halt to the given USB pipe.
- */
-static void wq_clear_halt(struct work_struct *wq_obj)
-{
- struct buf_anchor *anchor;
- struct most_dev *mdev;
- struct mbo *mbo;
- struct urb *urb;
- unsigned int channel;
- unsigned long flags;
-
- anchor = to_buf_anchor(wq_obj);
- urb = anchor->urb;
- mbo = urb->context;
- mdev = to_mdev(mbo->ifp);
- channel = mbo->hdm_channel_id;
-
- if (usb_clear_halt(urb->dev, urb->pipe))
- dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
-
- usb_free_urb(urb);
- spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
- list_del(&anchor->list);
- spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
-
- if (likely(mbo->complete))
- mbo->complete(mbo);
- if (mdev->conf[channel].direction & MOST_CH_TX)
- most_resume_enqueue(&mdev->iface, channel);
-
- kfree(anchor);
-}
-
-/**
- * hdm_usb_fops - file operation table for USB driver
- */
-static const struct file_operations hdm_usb_fops = {
- .owner = THIS_MODULE,
-};
-
-/**
- * usb_device_id - ID table for HCD device probing
- */
-static struct usb_device_id usbid[] = {
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_INIC), },
- { } /* Terminating entry */
-};
-
-#define MOST_DCI_RO_ATTR(_name) \
- struct most_dci_attribute most_dci_attr_##_name = \
- __ATTR(_name, S_IRUGO, show_value, NULL)
-
-#define MOST_DCI_ATTR(_name) \
- struct most_dci_attribute most_dci_attr_##_name = \
- __ATTR(_name, S_IRUGO | S_IWUSR, show_value, store_value)
-
-/**
- * struct most_dci_attribute - to access the attributes of a dci object
- * @attr: attributes of a dci object
- * @show: pointer to the show function
- * @store: pointer to the store function
- */
-struct most_dci_attribute {
- struct attribute attr;
- ssize_t (*show)(struct most_dci_obj *d,
- struct most_dci_attribute *attr,
- char *buf);
- ssize_t (*store)(struct most_dci_obj *d,
- struct most_dci_attribute *attr,
- const char *buf,
- size_t count);
-};
-
-#define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
-
-/**
- * dci_attr_show - show function for dci object
- * @kobj: pointer to kobject
- * @attr: pointer to attribute struct
- * @buf: buffer
- */
-static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- struct most_dci_attribute *dci_attr = to_dci_attr(attr);
- struct most_dci_obj *dci_obj = to_dci_obj(kobj);
-
- if (!dci_attr->show)
- return -EIO;
-
- return dci_attr->show(dci_obj, dci_attr, buf);
-}
-
-/**
- * dci_attr_store - store function for dci object
- * @kobj: pointer to kobject
- * @attr: pointer to attribute struct
- * @buf: buffer
- * @len: length of buffer
- */
-static ssize_t dci_attr_store(struct kobject *kobj,
- struct attribute *attr,
- const char *buf,
- size_t len)
-{
- struct most_dci_attribute *dci_attr = to_dci_attr(attr);
- struct most_dci_obj *dci_obj = to_dci_obj(kobj);
-
- if (!dci_attr->store)
- return -EIO;
-
- return dci_attr->store(dci_obj, dci_attr, buf, len);
-}
-
-static const struct sysfs_ops most_dci_sysfs_ops = {
- .show = dci_attr_show,
- .store = dci_attr_store,
-};
-
-/**
- * most_dci_release - release function for dci object
- * @kobj: pointer to kobject
- *
- * This frees the memory allocated for the dci object
- */
-static void most_dci_release(struct kobject *kobj)
-{
- struct most_dci_obj *dci_obj = to_dci_obj(kobj);
-
- kfree(dci_obj);
-}
-
-static ssize_t show_value(struct most_dci_obj *dci_obj,
- struct most_dci_attribute *attr, char *buf)
-{
- u16 tmp_val;
- u16 reg_addr;
- int err;
-
- if (!strcmp(attr->attr.name, "ni_state"))
- reg_addr = DRCI_REG_NI_STATE;
- else if (!strcmp(attr->attr.name, "packet_bandwidth"))
- reg_addr = DRCI_REG_PACKET_BW;
- else if (!strcmp(attr->attr.name, "node_address"))
- reg_addr = DRCI_REG_NODE_ADDR;
- else if (!strcmp(attr->attr.name, "node_position"))
- reg_addr = DRCI_REG_NODE_POS;
- else if (!strcmp(attr->attr.name, "mep_filter"))
- reg_addr = DRCI_REG_MEP_FILTER;
- else if (!strcmp(attr->attr.name, "mep_hash0"))
- reg_addr = DRCI_REG_HASH_TBL0;
- else if (!strcmp(attr->attr.name, "mep_hash1"))
- reg_addr = DRCI_REG_HASH_TBL1;
- else if (!strcmp(attr->attr.name, "mep_hash2"))
- reg_addr = DRCI_REG_HASH_TBL2;
- else if (!strcmp(attr->attr.name, "mep_hash3"))
- reg_addr = DRCI_REG_HASH_TBL3;
- else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
- reg_addr = DRCI_REG_HW_ADDR_HI;
- else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
- reg_addr = DRCI_REG_HW_ADDR_MI;
- else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
- reg_addr = DRCI_REG_HW_ADDR_LO;
- else
- return -EIO;
-
- err = drci_rd_reg(dci_obj->usb_device, reg_addr, &tmp_val);
- if (err < 0)
- return err;
-
- return snprintf(buf, PAGE_SIZE, "%04x\n", tmp_val);
-}
-
-static ssize_t store_value(struct most_dci_obj *dci_obj,
- struct most_dci_attribute *attr,
- const char *buf, size_t count)
-{
- u16 val;
- u16 reg_addr;
- int err;
-
- if (!strcmp(attr->attr.name, "mep_filter"))
- reg_addr = DRCI_REG_MEP_FILTER;
- else if (!strcmp(attr->attr.name, "mep_hash0"))
- reg_addr = DRCI_REG_HASH_TBL0;
- else if (!strcmp(attr->attr.name, "mep_hash1"))
- reg_addr = DRCI_REG_HASH_TBL1;
- else if (!strcmp(attr->attr.name, "mep_hash2"))
- reg_addr = DRCI_REG_HASH_TBL2;
- else if (!strcmp(attr->attr.name, "mep_hash3"))
- reg_addr = DRCI_REG_HASH_TBL3;
- else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
- reg_addr = DRCI_REG_HW_ADDR_HI;
- else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
- reg_addr = DRCI_REG_HW_ADDR_MI;
- else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
- reg_addr = DRCI_REG_HW_ADDR_LO;
- else
- return -EIO;
-
- err = kstrtou16(buf, 16, &val);
- if (err)
- return err;
-
- err = drci_wr_reg(dci_obj->usb_device, reg_addr, val);
- if (err < 0)
- return err;
-
- return count;
-}
-
-static MOST_DCI_RO_ATTR(ni_state);
-static MOST_DCI_RO_ATTR(packet_bandwidth);
-static MOST_DCI_RO_ATTR(node_address);
-static MOST_DCI_RO_ATTR(node_position);
-static MOST_DCI_ATTR(mep_filter);
-static MOST_DCI_ATTR(mep_hash0);
-static MOST_DCI_ATTR(mep_hash1);
-static MOST_DCI_ATTR(mep_hash2);
-static MOST_DCI_ATTR(mep_hash3);
-static MOST_DCI_ATTR(mep_eui48_hi);
-static MOST_DCI_ATTR(mep_eui48_mi);
-static MOST_DCI_ATTR(mep_eui48_lo);
-
-/**
- * most_dci_def_attrs - array of default attribute files of the dci object
- */
-static struct attribute *most_dci_def_attrs[] = {
- &most_dci_attr_ni_state.attr,
- &most_dci_attr_packet_bandwidth.attr,
- &most_dci_attr_node_address.attr,
- &most_dci_attr_node_position.attr,
- &most_dci_attr_mep_filter.attr,
- &most_dci_attr_mep_hash0.attr,
- &most_dci_attr_mep_hash1.attr,
- &most_dci_attr_mep_hash2.attr,
- &most_dci_attr_mep_hash3.attr,
- &most_dci_attr_mep_eui48_hi.attr,
- &most_dci_attr_mep_eui48_mi.attr,
- &most_dci_attr_mep_eui48_lo.attr,
- NULL,
-};
-
-/**
- * DCI ktype
- */
-static struct kobj_type most_dci_ktype = {
- .sysfs_ops = &most_dci_sysfs_ops,
- .release = most_dci_release,
- .default_attrs = most_dci_def_attrs,
-};
-
-/**
- * create_most_dci_obj - allocates a dci object
- * @parent: parent kobject
- *
- * This creates a dci object and registers it with sysfs.
- * Returns a pointer to the object or NULL when something went wrong.
- */
-static struct
-most_dci_obj *create_most_dci_obj(struct kobject *parent)
-{
- struct most_dci_obj *most_dci;
- int retval;
-
- most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
- if (!most_dci)
- return NULL;
-
- retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
- "dci");
- if (retval) {
- kobject_put(&most_dci->kobj);
- return NULL;
- }
- return most_dci;
-}
-
-/**
- * destroy_most_dci_obj - DCI object release function
- * @p: pointer to dci object
- */
-static void destroy_most_dci_obj(struct most_dci_obj *p)
-{
- kobject_put(&p->kobj);
-}
-
-/**
- * hdm_probe - probe function of USB device driver
- * @interface: Interface of the attached USB device
- * @id: Pointer to the USB ID table.
- *
- * This allocates and initializes the device instance, adds the new
- * entry to the internal list, scans the USB descriptors and registers
- * the interface with the core.
- * Additionally, the DCI objects are created and the hardware is sync'd.
- *
- * Return 0 on success. In case of an error a negative number is returned.
- */
-static int
-hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
-{
- unsigned int i;
- unsigned int num_endpoints;
- struct most_channel_capability *tmp_cap;
- struct most_dev *mdev;
- struct usb_device *usb_dev;
- struct device *dev;
- struct usb_host_interface *usb_iface_desc;
- struct usb_endpoint_descriptor *ep_desc;
- int ret = 0;
- int err;
-
- usb_iface_desc = interface->cur_altsetting;
- usb_dev = interface_to_usbdev(interface);
- dev = &usb_dev->dev;
- mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
- if (!mdev)
- goto exit_ENOMEM;
-
- usb_set_intfdata(interface, mdev);
- num_endpoints = usb_iface_desc->desc.bNumEndpoints;
- mutex_init(&mdev->io_mutex);
- INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
- setup_timer(&mdev->link_stat_timer, link_stat_timer_handler,
- (unsigned long)mdev);
-
- mdev->usb_device = usb_dev;
- mdev->link_stat_timer.expires = jiffies + (2 * HZ);
-
- mdev->iface.mod = hdm_usb_fops.owner;
- mdev->iface.interface = ITYPE_USB;
- mdev->iface.configure = hdm_configure_channel;
- mdev->iface.request_netinfo = hdm_request_netinfo;
- mdev->iface.enqueue = hdm_enqueue;
- mdev->iface.poison_channel = hdm_poison_channel;
- mdev->iface.description = mdev->description;
- mdev->iface.num_channels = num_endpoints;
-
- snprintf(mdev->description, sizeof(mdev->description),
- "usb_device %d-%s:%d.%d",
- usb_dev->bus->busnum,
- usb_dev->devpath,
- usb_dev->config->desc.bConfigurationValue,
- usb_iface_desc->desc.bInterfaceNumber);
-
- mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
- if (!mdev->conf)
- goto exit_free;
-
- mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
- if (!mdev->cap)
- goto exit_free1;
-
- mdev->iface.channel_vector = mdev->cap;
- mdev->iface.priv = NULL;
-
- mdev->ep_address =
- kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
- if (!mdev->ep_address)
- goto exit_free2;
-
- mdev->anchor_list =
- kcalloc(num_endpoints, sizeof(*mdev->anchor_list), GFP_KERNEL);
- if (!mdev->anchor_list)
- goto exit_free3;
-
- tmp_cap = mdev->cap;
- for (i = 0; i < num_endpoints; i++) {
- ep_desc = &usb_iface_desc->endpoint[i].desc;
- mdev->ep_address[i] = ep_desc->bEndpointAddress;
- mdev->padding_active[i] = false;
- mdev->is_channel_healthy[i] = true;
-
- snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
- mdev->ep_address[i]);
-
- tmp_cap->name_suffix = &mdev->suffix[i][0];
- tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
- tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
- tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
- tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
- tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
- MOST_CH_ISOC_AVP | MOST_CH_SYNC;
- if (ep_desc->bEndpointAddress & USB_DIR_IN)
- tmp_cap->direction = MOST_CH_RX;
- else
- tmp_cap->direction = MOST_CH_TX;
- tmp_cap++;
- INIT_LIST_HEAD(&mdev->anchor_list[i]);
- spin_lock_init(&mdev->anchor_list_lock[i]);
- err = drci_wr_reg(usb_dev,
- DRCI_REG_BASE + DRCI_COMMAND +
- ep_desc->bEndpointAddress * 16,
- 1);
- if (err < 0)
- pr_warn("DCI Sync for EP %02x failed",
- ep_desc->bEndpointAddress);
- }
- dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
- le16_to_cpu(usb_dev->descriptor.idVendor),
- le16_to_cpu(usb_dev->descriptor.idProduct),
- usb_dev->bus->busnum,
- usb_dev->devnum);
-
- dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
- usb_dev->bus->busnum,
- usb_dev->devpath,
- usb_dev->config->desc.bConfigurationValue,
- usb_iface_desc->desc.bInterfaceNumber);
-
- mdev->parent = most_register_interface(&mdev->iface);
- if (IS_ERR(mdev->parent)) {
- ret = PTR_ERR(mdev->parent);
- goto exit_free4;
- }
-
- mutex_lock(&mdev->io_mutex);
- if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_INIC) {
- /* this increments the reference count of the instance
- * object of the core
- */
- mdev->dci = create_most_dci_obj(mdev->parent);
- if (!mdev->dci) {
- mutex_unlock(&mdev->io_mutex);
- most_deregister_interface(&mdev->iface);
- ret = -ENOMEM;
- goto exit_free4;
- }
-
- kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
- mdev->dci->usb_device = mdev->usb_device;
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-
-exit_free4:
- kfree(mdev->anchor_list);
-exit_free3:
- kfree(mdev->ep_address);
-exit_free2:
- kfree(mdev->cap);
-exit_free1:
- kfree(mdev->conf);
-exit_free:
- kfree(mdev);
-exit_ENOMEM:
- if (ret == 0 || ret == -ENOMEM) {
- ret = -ENOMEM;
- dev_err(dev, "out of memory\n");
- }
- return ret;
-}
-
-/**
- * hdm_disconnect - disconnect function of USB device driver
- * @interface: Interface of the attached USB device
- *
- * This deregisters the interface with the core, removes the kernel timer
- * and frees resources.
- *
- * Context: hub kernel thread
- */
-static void hdm_disconnect(struct usb_interface *interface)
-{
- struct most_dev *mdev;
-
- mdev = usb_get_intfdata(interface);
- mutex_lock(&mdev->io_mutex);
- usb_set_intfdata(interface, NULL);
- mdev->usb_device = NULL;
- mutex_unlock(&mdev->io_mutex);
-
- del_timer_sync(&mdev->link_stat_timer);
- cancel_work_sync(&mdev->poll_work_obj);
-
- destroy_most_dci_obj(mdev->dci);
- most_deregister_interface(&mdev->iface);
-
- kfree(mdev->anchor_list);
- kfree(mdev->cap);
- kfree(mdev->conf);
- kfree(mdev->ep_address);
- kfree(mdev);
-}
-
-static struct usb_driver hdm_usb = {
- .name = "hdm_usb",
- .id_table = usbid,
- .probe = hdm_probe,
- .disconnect = hdm_disconnect,
-};
-
-static int __init hdm_usb_init(void)
-{
- pr_info("hdm_usb_init()\n");
- if (usb_register(&hdm_usb)) {
- pr_err("could not register hdm_usb driver\n");
- return -EIO;
- }
- schedule_usb_work = create_workqueue("hdmu_work");
- if (!schedule_usb_work) {
- pr_err("could not create workqueue\n");
- usb_deregister(&hdm_usb);
- return -ENOMEM;
- }
- return 0;
-}
-
-static void __exit hdm_usb_exit(void)
-{
- pr_info("hdm_usb_exit()\n");
- destroy_workqueue(schedule_usb_work);
- usb_deregister(&hdm_usb);
-}
-
-module_init(hdm_usb_init);
-module_exit(hdm_usb_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
-MODULE_DESCRIPTION("HDM_4_USB");
Code Review / AGL / meta-agl-demo.git / blobdiff