diff options
Diffstat (limited to 'recipes-kernel/hdm-usb/files')
| -rw-r--r-- | recipes-kernel/hdm-usb/files/COPYING | 340 | ||||
| -rw-r--r-- | recipes-kernel/hdm-usb/files/Makefile | 17 | ||||
| -rw-r--r-- | recipes-kernel/hdm-usb/files/hdm_usb.c | 1438 |
3 files changed, 1795 insertions, 0 deletions
diff --git a/recipes-kernel/hdm-usb/files/COPYING b/recipes-kernel/hdm-usb/files/COPYING new file mode 100644 index 000000000..6d45519c8 --- /dev/null +++ b/recipes-kernel/hdm-usb/files/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/recipes-kernel/hdm-usb/files/Makefile b/recipes-kernel/hdm-usb/files/Makefile new file mode 100644 index 000000000..0714f6b73 --- /dev/null +++ b/recipes-kernel/hdm-usb/files/Makefile @@ -0,0 +1,17 @@ +# Makefile +# + +SRC := $(shell pwd) + +obj-m += hdm_usb.o +CFLAGS_hdm_usb.o := -I$(src)/../../aim-network/files/ -I$(src)/../../mostcore/files + +all: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules + +modules_install: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install + +clean: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) clean + diff --git a/recipes-kernel/hdm-usb/files/hdm_usb.c b/recipes-kernel/hdm-usb/files/hdm_usb.c new file mode 100644 index 000000000..41690f801 --- /dev/null +++ b/recipes-kernel/hdm-usb/files/hdm_usb.c @@ -0,0 +1,1438 @@ +/* + * 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"); |