This patch adds the USB driver source file most_usb.c and
modifies the Makefile and Kconfig accordingly.
Signed-off-by: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
---
v2:
Reported-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
- don't remove usb driver from staging area
- don't touch staging/most/Kconfig
- remove subdirectory for USB driver and put source file into
drivers/most
v3:
- submitted fixes found during code audit to staging version
first to be able to resend single patch that adds the driver
v4:
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
submitted patch set that fixes issues found during code audit
to staging version first to be able to resend single patch that
adds the driver. The patch series included:
- use function sysfs_streq
- add missing put_device calls
- use correct error codes
- replace code to calculate array index
- don't use error path to exit function on success
- move allocation of URB out of critical section
- return 0 instead of variable
- change return value of function drci_rd_reg
- don't use expressions that might fail in a declaration
- change order of function parameters
v5:
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
submitted patch set that fixes issues found during code audit
to staging version first to be able to resend single patch that
adds the driver. The patch series included:
- init return value in default path of switch/case expression
v6:
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
remove dependency to NET in Kconfig file
drivers/most/Kconfig | 11 +
drivers/most/Makefile | 2 +
drivers/most/most_usb.c | 1170 +++++++++++++++++++++++++++++++++++++
drivers/staging/most/Kconfig | 2 -
drivers/staging/most/usb/Kconfig | 13 -
drivers/staging/most/usb/Makefile | 4 -
drivers/staging/most/usb/usb.c | 1170 -------------------------------------
7 files changed, 1183 insertions(+), 1189 deletions(-)
create mode 100644 drivers/most/most_usb.c
delete mode 100644 drivers/staging/most/usb/Kconfig
delete mode 100644 drivers/staging/most/usb/Makefile
delete mode 100644 drivers/staging/most/usb/usb.c
diff --git a/drivers/most/Kconfig b/drivers/most/Kconfig
index 58d7999..60fc082 100644
--- a/drivers/most/Kconfig
+++ b/drivers/most/Kconfig
@@ -13,3 +13,14 @@ menuconfig MOST
module will be called most_core.
If in doubt, say N here.
+
+if MOST
+config MOST_USB_HDM
+ tristate "USB"
+ depends on USB
+ help
+ Say Y here if you want to connect via USB to network transceiver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called most_usb.
+endif
diff --git a/drivers/most/Makefile b/drivers/most/Makefile
index e810cd3..6a3cb90 100644
--- a/drivers/most/Makefile
+++ b/drivers/most/Makefile
@@ -2,3 +2,5 @@
obj-$(CONFIG_MOST) += most_core.o
most_core-y := core.o \
configfs.o
+
+obj-$(CONFIG_MOST_USB_HDM) += most_usb.o
diff --git a/drivers/most/most_usb.c b/drivers/most/most_usb.c
new file mode 100644
index 0000000..2640c5b
--- /dev/null
+++ b/drivers/most/most_usb.c
@@ -0,0 +1,1170 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * usb.c - Hardware dependent module for USB
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#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 <linux/most.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 USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
+#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
+#define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */
+#define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */
+#define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */
+/* 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 most_dci_obj - Direct Communication Interface
+ * @kobj:position in sysfs
+ * @usb_device: pointer to the usb device
+ * @reg_addr: register address for arbitrary DCI access
+ */
+struct most_dci_obj {
+ struct device dev;
+ struct usb_device *usb_device;
+ u16 reg_addr;
+};
+
+#define to_dci_obj(p) container_of(p, struct most_dci_obj, dev)
+
+struct most_dev;
+
+struct clear_hold_work {
+ struct work_struct ws;
+ struct most_dev *mdev;
+ unsigned int channel;
+ int pipe;
+};
+
+#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
+
+/**
+ * struct most_dev - holds all usb interface specific stuff
+ * @usb_device: pointer to usb device
+ * @iface: hardware interface
+ * @cap: channel capabilities
+ * @conf: channel configuration
+ * @dci: direct communication interface of hardware
+ * @ep_address: endpoint address table
+ * @description: device description
+ * @suffix: suffix for channel name
+ * @channel_lock: synchronize channel access
+ * @padding_active: indicates channel uses padding
+ * @is_channel_healthy: health status table of each channel
+ * @busy_urbs: 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 device dev;
+ 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 *ep_address;
+ char description[MAX_STRING_LEN];
+ char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
+ spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
+ bool padding_active[MAX_NUM_ENDPOINTS];
+ bool is_channel_healthy[MAX_NUM_ENDPOINTS];
+ struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
+ struct usb_anchor *busy_urbs;
+ struct mutex io_mutex;
+ struct timer_list link_stat_timer;
+ struct work_struct poll_work_obj;
+ void (*on_netinfo)(struct most_interface *most_iface,
+ unsigned char link_state, unsigned char *addrs);
+};
+
+#define to_mdev(d) container_of(d, struct most_dev, iface)
+#define to_mdev_from_dev(d) container_of(d, struct most_dev, dev)
+#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
+
+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;
+ __le16 *dma_buf;
+ u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
+
+ dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
+ if (!dma_buf)
+ return -ENOMEM;
+
+ retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ DRCI_READ_REQ, req_type,
+ 0x0000,
+ reg, dma_buf, sizeof(*dma_buf), 5 * HZ);
+ *buf = le16_to_cpu(*dma_buf);
+ kfree(dma_buf);
+
+ if (retval < 0)
+ return retval;
+ return 0;
+}
+
+/**
+ * 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);
+}
+
+static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep)
+{
+ return drci_wr_reg(usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, 1);
+}
+
+/**
+ * get_stream_frame_size - calculate frame size of current configuration
+ * @dev: device structure
+ * @cfg: channel configuration
+ */
+static unsigned int get_stream_frame_size(struct device *dev,
+ struct most_channel_config *cfg)
+{
+ unsigned int frame_size;
+ unsigned int sub_size = cfg->subbuffer_size;
+
+ if (!sub_size) {
+ dev_warn(dev, "Misconfig: Subbuffer size zero.\n");
+ return 0;
+ }
+ switch (cfg->data_type) {
+ case MOST_CH_ISOC:
+ frame_size = AV_PACKETS_PER_XACT * sub_size;
+ break;
+ case MOST_CH_SYNC:
+ if (cfg->packets_per_xact == 0) {
+ dev_warn(dev, "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:
+ dev_warn(dev, "Query frame size of non-streaming channel\n");
+ frame_size = 0;
+ 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 = to_mdev(iface);
+ unsigned long flags;
+ spinlock_t *lock; /* temp. lock */
+
+ if (channel < 0 || channel >= iface->num_channels) {
+ dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
+ return -ECHRNG;
+ }
+
+ lock = mdev->channel_lock + channel;
+ spin_lock_irqsave(lock, flags);
+ mdev->is_channel_healthy[channel] = false;
+ spin_unlock_irqrestore(lock, flags);
+
+ cancel_work_sync(&mdev->clear_work[channel].ws);
+
+ mutex_lock(&mdev->io_mutex);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[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 frame_size = get_stream_frame_size(&mdev->dev, conf);
+ unsigned int j, num_frames;
+
+ if (!frame_size)
+ return -EINVAL;
+ num_frames = mbo->buffer_length / frame_size;
+
+ if (num_frames < 1) {
+ dev_err(&mdev->usb_device->dev,
+ "Missed minimal transfer unit.\n");
+ return -EINVAL;
+ }
+
+ for (j = num_frames - 1; j > 0; j--)
+ memmove(mbo->virt_address + j * USB_MTU,
+ mbo->virt_address + j * frame_size,
+ 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)
+{
+ struct most_channel_config *const conf = &mdev->conf[channel];
+ unsigned int frame_size = get_stream_frame_size(&mdev->dev, conf);
+ unsigned int j, num_frames;
+
+ if (!frame_size)
+ return -EINVAL;
+ 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 = urb->context;
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+ unsigned int channel = mbo->hdm_channel_id;
+ spinlock_t *lock = mdev->channel_lock + channel;
+ unsigned long flags;
+
+ spin_lock_irqsave(lock, flags);
+
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ if (likely(mdev->is_channel_healthy[channel])) {
+ switch (urb->status) {
+ case 0:
+ case -ESHUTDOWN:
+ mbo->processed_length = urb->actual_length;
+ mbo->status = MBO_SUCCESS;
+ break;
+ case -EPIPE:
+ dev_warn(&mdev->usb_device->dev,
+ "Broken pipe on ep%02x\n",
+ mdev->ep_address[channel]);
+ mdev->is_channel_healthy[channel] = false;
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
+ break;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(lock, flags);
+
+ 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!
+ */
+static void hdm_read_completion(struct urb *urb)
+{
+ struct mbo *mbo = urb->context;
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+ unsigned int channel = mbo->hdm_channel_id;
+ struct device *dev = &mdev->usb_device->dev;
+ spinlock_t *lock = mdev->channel_lock + channel;
+ unsigned long flags;
+
+ spin_lock_irqsave(lock, flags);
+
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ if (likely(mdev->is_channel_healthy[channel])) {
+ switch (urb->status) {
+ case 0:
+ case -ESHUTDOWN:
+ mbo->processed_length = urb->actual_length;
+ mbo->status = MBO_SUCCESS;
+ if (mdev->padding_active[channel] &&
+ hdm_remove_padding(mdev, channel, mbo)) {
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ }
+ break;
+ case -EPIPE:
+ dev_warn(dev, "Broken pipe on ep%02x\n",
+ mdev->ep_address[channel]);
+ mdev->is_channel_healthy[channel] = false;
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
+ break;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ case -EOVERFLOW:
+ dev_warn(dev, "Babble on ep%02x\n",
+ mdev->ep_address[channel]);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(lock, flags);
+
+ 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 = to_mdev(iface);
+ struct most_channel_config *conf;
+ int retval = 0;
+ struct urb *urb;
+ unsigned long length;
+ void *virt_address;
+
+ if (!mbo)
+ return -EINVAL;
+ if (iface->num_channels <= channel || channel < 0)
+ return -ECHRNG;
+
+ urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_KERNEL);
+ if (!urb)
+ return -ENOMEM;
+
+ conf = &mdev->conf[channel];
+
+ mutex_lock(&mdev->io_mutex);
+ if (!mdev->usb_device) {
+ retval = -ENODEV;
+ goto err_free_urb;
+ }
+
+ if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
+ hdm_add_padding(mdev, channel, mbo)) {
+ retval = -EINVAL;
+ goto err_free_urb;
+ }
+
+ 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 &&
+ conf->data_type != MOST_CH_SYNC)
+ 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;
+
+ usb_anchor_urb(urb, &mdev->busy_urbs[channel]);
+
+ retval = usb_submit_urb(urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(&mdev->usb_device->dev,
+ "URB submit failed with error %d.\n", retval);
+ goto err_unanchor_urb;
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+
+err_unanchor_urb:
+ usb_unanchor_urb(urb);
+err_free_urb:
+ usb_free_urb(urb);
+ mutex_unlock(&mdev->io_mutex);
+ return retval;
+}
+
+static void *hdm_dma_alloc(struct mbo *mbo, u32 size)
+{
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+
+ return usb_alloc_coherent(mdev->usb_device, size, GFP_KERNEL,
+ &mbo->bus_address);
+}
+
+static void hdm_dma_free(struct mbo *mbo, u32 size)
+{
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+
+ usb_free_coherent(mdev->usb_device, size, mbo->virt_address,
+ mbo->bus_address);
+}
+
+/**
+ * hdm_configure_channel - receive channel configuration from core
+ * @iface: interface
+ * @channel: channel ID
+ * @conf: structure that holds the configuration information
+ *
+ * The attached network interface controller (NIC) supports a padding mode
+ * to avoid short packets on USB, hence increasing the performance due to a
+ * lower interrupt load. This mode is default for synchronous data and can
+ * be switched on for isochronous data. In case padding is active the
+ * driver needs to know the frame size of the payload in order to calculate
+ * the number of bytes it needs to pad when transmitting or to cut off when
+ * receiving data.
+ *
+ */
+static int hdm_configure_channel(struct most_interface *iface, int channel,
+ struct most_channel_config *conf)
+{
+ unsigned int num_frames;
+ unsigned int frame_size;
+ struct most_dev *mdev = to_mdev(iface);
+ struct device *dev = &mdev->usb_device->dev;
+
+ if (!conf) {
+ dev_err(dev, "Bad config pointer.\n");
+ return -EINVAL;
+ }
+ if (channel < 0 || channel >= iface->num_channels) {
+ dev_err(dev, "Channel ID out of range.\n");
+ return -EINVAL;
+ }
+
+ mdev->is_channel_healthy[channel] = true;
+ mdev->clear_work[channel].channel = channel;
+ mdev->clear_work[channel].mdev = mdev;
+ INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
+
+ 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 &&
+ conf->packets_per_xact != 0xFF)) {
+ mdev->padding_active[channel] = false;
+ /*
+ * Since the NIC's padding mode is not going to be
+ * used, we can skip the frame size calculations and
+ * move directly on to exit.
+ */
+ goto exit;
+ }
+
+ mdev->padding_active[channel] = true;
+
+ frame_size = get_stream_frame_size(&mdev->dev, conf);
+ if (frame_size == 0 || frame_size > USB_MTU) {
+ dev_warn(dev, "Misconfig: frame size wrong\n");
+ return -EINVAL;
+ }
+
+ num_frames = conf->buffer_size / frame_size;
+
+ if (conf->buffer_size % frame_size) {
+ u16 old_size = conf->buffer_size;
+
+ conf->buffer_size = num_frames * frame_size;
+ dev_warn(dev, "%s: fixed buffer size (%d -> %d)\n",
+ mdev->suffix[channel], old_size, conf->buffer_size);
+ }
+
+ /* calculate extra length to comply w/ HW padding */
+ conf->extra_len = num_frames * (USB_MTU - frame_size);
+
+exit:
+ mdev->conf[channel] = *conf;
+ if (conf->data_type == MOST_CH_ASYNC) {
+ u16 ep = mdev->ep_address[channel];
+
+ if (start_sync_ep(mdev->usb_device, ep) < 0)
+ dev_warn(dev, "sync for ep%02x failed", ep);
+ }
+ 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,
+ void (*on_netinfo)(struct most_interface *,
+ unsigned char,
+ unsigned char *))
+{
+ struct most_dev *mdev = to_mdev(iface);
+
+ mdev->on_netinfo = on_netinfo;
+ if (!on_netinfo)
+ return;
+
+ mdev->link_stat_timer.expires = jiffies + HZ;
+ mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
+}
+
+/**
+ * link_stat_timer_handler - schedule work obtaining mac address and link status
+ * @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(struct timer_list *t)
+{
+ struct most_dev *mdev = from_timer(mdev, t, link_stat_timer);
+
+ schedule_work(&mdev->poll_work_obj);
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+ add_timer(&mdev->link_stat_timer);
+}
+
+/**
+ * wq_netinfo - work queue function to deliver latest networking information
+ * @wq_obj: object that holds data for our deferred work to do
+ *
+ * This retrieves the network interface status of the USB INIC
+ */
+static void wq_netinfo(struct work_struct *wq_obj)
+{
+ struct most_dev *mdev = to_mdev_from_work(wq_obj);
+ struct usb_device *usb_device = mdev->usb_device;
+ struct device *dev = &usb_device->dev;
+ u16 hi, mi, lo, link;
+ u8 hw_addr[6];
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi)) {
+ dev_err(dev, "Vendor request 'hw_addr_hi' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi)) {
+ dev_err(dev, "Vendor request 'hw_addr_mid' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo)) {
+ dev_err(dev, "Vendor request 'hw_addr_low' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link)) {
+ dev_err(dev, "Vendor request 'link status' failed\n");
+ return;
+ }
+
+ hw_addr[0] = hi >> 8;
+ hw_addr[1] = hi;
+ hw_addr[2] = mi >> 8;
+ hw_addr[3] = mi;
+ hw_addr[4] = lo >> 8;
+ hw_addr[5] = lo;
+
+ if (mdev->on_netinfo)
+ mdev->on_netinfo(&mdev->iface, link, hw_addr);
+}
+
+/**
+ * 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 clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
+ struct most_dev *mdev = clear_work->mdev;
+ unsigned int channel = clear_work->channel;
+ int pipe = clear_work->pipe;
+ int snd_pipe;
+ int peer;
+
+ mutex_lock(&mdev->io_mutex);
+ most_stop_enqueue(&mdev->iface, channel);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
+ if (usb_clear_halt(mdev->usb_device, pipe))
+ dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
+
+ /* If the functional Stall condition has been set on an
+ * asynchronous rx channel, we need to clear the tx channel
+ * too, since the hardware runs its clean-up sequence on both
+ * channels, as they are physically one on the network.
+ *
+ * The USB interface that exposes the asynchronous channels
+ * contains always two endpoints, and two only.
+ */
+ if (mdev->conf[channel].data_type == MOST_CH_ASYNC &&
+ mdev->conf[channel].direction == MOST_CH_RX) {
+ if (channel == 0)
+ peer = 1;
+ else
+ peer = 0;
+ snd_pipe = usb_sndbulkpipe(mdev->usb_device,
+ mdev->ep_address[peer]);
+ usb_clear_halt(mdev->usb_device, snd_pipe);
+ }
+ mdev->is_channel_healthy[channel] = true;
+ most_resume_enqueue(&mdev->iface, channel);
+ mutex_unlock(&mdev->io_mutex);
+}
+
+/**
+ * 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 const struct usb_device_id usbid[] = {
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
+ { } /* Terminating entry */
+};
+
+struct regs {
+ const char *name;
+ u16 reg;
+};
+
+static const struct regs ro_regs[] = {
+ { "ni_state", DRCI_REG_NI_STATE },
+ { "packet_bandwidth", DRCI_REG_PACKET_BW },
+ { "node_address", DRCI_REG_NODE_ADDR },
+ { "node_position", DRCI_REG_NODE_POS },
+};
+
+static const struct regs rw_regs[] = {
+ { "mep_filter", DRCI_REG_MEP_FILTER },
+ { "mep_hash0", DRCI_REG_HASH_TBL0 },
+ { "mep_hash1", DRCI_REG_HASH_TBL1 },
+ { "mep_hash2", DRCI_REG_HASH_TBL2 },
+ { "mep_hash3", DRCI_REG_HASH_TBL3 },
+ { "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
+ { "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
+ { "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
+};
+
+static int get_stat_reg_addr(const struct regs *regs, int size,
+ const char *name, u16 *reg_addr)
+{
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (sysfs_streq(name, regs[i].name)) {
+ *reg_addr = regs[i].reg;
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+
+#define get_static_reg_addr(regs, name, reg_addr) \
+ get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
+
+static ssize_t value_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ const char *name = attr->attr.name;
+ struct most_dci_obj *dci_obj = to_dci_obj(dev);
+ u16 val;
+ u16 reg_addr;
+ int err;
+
+ if (sysfs_streq(name, "arb_address"))
+ return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
+
+ if (sysfs_streq(name, "arb_value"))
+ reg_addr = dci_obj->reg_addr;
+ else if (get_static_reg_addr(ro_regs, name, ®_addr) &&
+ get_static_reg_addr(rw_regs, name, ®_addr))
+ return -EINVAL;
+
+ err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
+ if (err < 0)
+ return err;
+
+ return snprintf(buf, PAGE_SIZE, "%04x\n", val);
+}
+
+static ssize_t value_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u16 val;
+ u16 reg_addr;
+ const char *name = attr->attr.name;
+ struct most_dci_obj *dci_obj = to_dci_obj(dev);
+ struct usb_device *usb_dev = dci_obj->usb_device;
+ int err;
+
+ err = kstrtou16(buf, 16, &val);
+ if (err)
+ return err;
+
+ if (sysfs_streq(name, "arb_address")) {
+ dci_obj->reg_addr = val;
+ return count;
+ }
+
+ if (sysfs_streq(name, "arb_value"))
+ err = drci_wr_reg(usb_dev, dci_obj->reg_addr, val);
+ else if (sysfs_streq(name, "sync_ep"))
+ err = start_sync_ep(usb_dev, val);
+ else if (!get_static_reg_addr(rw_regs, name, ®_addr))
+ err = drci_wr_reg(usb_dev, reg_addr, val);
+ else
+ return -EINVAL;
+
+ if (err < 0)
+ return err;
+
+ return count;
+}
+
+static DEVICE_ATTR(ni_state, 0444, value_show, NULL);
+static DEVICE_ATTR(packet_bandwidth, 0444, value_show, NULL);
+static DEVICE_ATTR(node_address, 0444, value_show, NULL);
+static DEVICE_ATTR(node_position, 0444, value_show, NULL);
+static DEVICE_ATTR(sync_ep, 0200, NULL, value_store);
+static DEVICE_ATTR(mep_filter, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash0, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash1, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash2, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash3, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_eui48_hi, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_eui48_mi, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_eui48_lo, 0644, value_show, value_store);
+static DEVICE_ATTR(arb_address, 0644, value_show, value_store);
+static DEVICE_ATTR(arb_value, 0644, value_show, value_store);
+
+static struct attribute *dci_attrs[] = {
+ &dev_attr_ni_state.attr,
+ &dev_attr_packet_bandwidth.attr,
+ &dev_attr_node_address.attr,
+ &dev_attr_node_position.attr,
+ &dev_attr_sync_ep.attr,
+ &dev_attr_mep_filter.attr,
+ &dev_attr_mep_hash0.attr,
+ &dev_attr_mep_hash1.attr,
+ &dev_attr_mep_hash2.attr,
+ &dev_attr_mep_hash3.attr,
+ &dev_attr_mep_eui48_hi.attr,
+ &dev_attr_mep_eui48_mi.attr,
+ &dev_attr_mep_eui48_lo.attr,
+ &dev_attr_arb_address.attr,
+ &dev_attr_arb_value.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(dci);
+
+static void release_dci(struct device *dev)
+{
+ struct most_dci_obj *dci = to_dci_obj(dev);
+
+ put_device(dev->parent);
+ kfree(dci);
+}
+
+static void release_mdev(struct device *dev)
+{
+ struct most_dev *mdev = to_mdev_from_dev(dev);
+
+ kfree(mdev);
+}
+/**
+ * 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)
+{
+ struct usb_host_interface *usb_iface_desc = interface->cur_altsetting;
+ struct usb_device *usb_dev = interface_to_usbdev(interface);
+ struct device *dev = &usb_dev->dev;
+ struct most_dev *mdev;
+ unsigned int i;
+ unsigned int num_endpoints;
+ struct most_channel_capability *tmp_cap;
+ struct usb_endpoint_descriptor *ep_desc;
+ int ret = -ENOMEM;
+
+ mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ if (!mdev)
+ return -ENOMEM;
+
+ usb_set_intfdata(interface, mdev);
+ num_endpoints = usb_iface_desc->desc.bNumEndpoints;
+ if (num_endpoints > MAX_NUM_ENDPOINTS) {
+ kfree(mdev);
+ return -EINVAL;
+ }
+ mutex_init(&mdev->io_mutex);
+ INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
+ timer_setup(&mdev->link_stat_timer, link_stat_timer_handler, 0);
+
+ mdev->usb_device = usb_dev;
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+
+ mdev->iface.mod = hdm_usb_fops.owner;
+ mdev->iface.dev = &mdev->dev;
+ mdev->iface.driver_dev = &interface->dev;
+ 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.dma_alloc = hdm_dma_alloc;
+ mdev->iface.dma_free = hdm_dma_free;
+ mdev->iface.description = mdev->description;
+ mdev->iface.num_channels = num_endpoints;
+
+ snprintf(mdev->description, sizeof(mdev->description),
+ "%d-%s:%d.%d",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ mdev->dev.init_name = mdev->description;
+ mdev->dev.parent = &interface->dev;
+ mdev->dev.release = release_mdev;
+ mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
+ if (!mdev->conf)
+ goto err_free_mdev;
+
+ mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
+ if (!mdev->cap)
+ goto err_free_conf;
+
+ mdev->iface.channel_vector = mdev->cap;
+ mdev->ep_address =
+ kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
+ if (!mdev->ep_address)
+ goto err_free_cap;
+
+ mdev->busy_urbs =
+ kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
+ if (!mdev->busy_urbs)
+ goto err_free_ep_address;
+
+ 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 | MOST_CH_SYNC;
+ if (usb_endpoint_dir_in(ep_desc))
+ tmp_cap->direction = MOST_CH_RX;
+ else
+ tmp_cap->direction = MOST_CH_TX;
+ tmp_cap++;
+ init_usb_anchor(&mdev->busy_urbs[i]);
+ spin_lock_init(&mdev->channel_lock[i]);
+ }
+ dev_dbg(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_dbg(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);
+
+ ret = most_register_interface(&mdev->iface);
+ if (ret)
+ goto err_free_busy_urbs;
+
+ mutex_lock(&mdev->io_mutex);
+ if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
+ le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
+ le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
+ mdev->dci = kzalloc(sizeof(*mdev->dci), GFP_KERNEL);
+ if (!mdev->dci) {
+ mutex_unlock(&mdev->io_mutex);
+ most_deregister_interface(&mdev->iface);
+ ret = -ENOMEM;
+ goto err_free_busy_urbs;
+ }
+
+ mdev->dci->dev.init_name = "dci";
+ mdev->dci->dev.parent = get_device(mdev->iface.dev);
+ mdev->dci->dev.groups = dci_groups;
+ mdev->dci->dev.release = release_dci;
+ if (device_register(&mdev->dci->dev)) {
+ mutex_unlock(&mdev->io_mutex);
+ most_deregister_interface(&mdev->iface);
+ ret = -ENOMEM;
+ goto err_free_dci;
+ }
+ mdev->dci->usb_device = mdev->usb_device;
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+err_free_dci:
+ put_device(&mdev->dci->dev);
+err_free_busy_urbs:
+ kfree(mdev->busy_urbs);
+err_free_ep_address:
+ kfree(mdev->ep_address);
+err_free_cap:
+ kfree(mdev->cap);
+err_free_conf:
+ kfree(mdev->conf);
+err_free_mdev:
+ put_device(&mdev->dev);
+ 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 = 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);
+
+ if (mdev->dci)
+ device_unregister(&mdev->dci->dev);
+ most_deregister_interface(&mdev->iface);
+
+ kfree(mdev->busy_urbs);
+ kfree(mdev->cap);
+ kfree(mdev->conf);
+ kfree(mdev->ep_address);
+ put_device(&mdev->dci->dev);
+ put_device(&mdev->dev);
+}
+
+static int hdm_suspend(struct usb_interface *interface, pm_message_t message)
+{
+ struct most_dev *mdev = usb_get_intfdata(interface);
+ int i;
+
+ mutex_lock(&mdev->io_mutex);
+ for (i = 0; i < mdev->iface.num_channels; i++) {
+ most_stop_enqueue(&mdev->iface, i);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[i]);
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+static int hdm_resume(struct usb_interface *interface)
+{
+ struct most_dev *mdev = usb_get_intfdata(interface);
+ int i;
+
+ mutex_lock(&mdev->io_mutex);
+ for (i = 0; i < mdev->iface.num_channels; i++)
+ most_resume_enqueue(&mdev->iface, i);
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+static struct usb_driver hdm_usb = {
+ .name = "hdm_usb",
+ .id_table = usbid,
+ .probe = hdm_probe,
+ .disconnect = hdm_disconnect,
+ .resume = hdm_resume,
+ .suspend = hdm_suspend,
+};
+
+module_usb_driver(hdm_usb);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Gromm <christian.gromm@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("HDM_4_USB");
diff --git a/drivers/staging/most/Kconfig b/drivers/staging/most/Kconfig
index c5a99f7..c35fb34f 100644
--- a/drivers/staging/most/Kconfig
+++ b/drivers/staging/most/Kconfig
@@ -30,6 +30,4 @@ source "drivers/staging/most/dim2/Kconfig"
source "drivers/staging/most/i2c/Kconfig"
-source "drivers/staging/most/usb/Kconfig"
-
endif
diff --git a/drivers/staging/most/usb/Kconfig b/drivers/staging/most/usb/Kconfig
deleted file mode 100644
index a47a973..0000000
--- a/drivers/staging/most/usb/Kconfig
+++ /dev/null
@@ -1,13 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# MOST USB configuration
-#
-
-config MOST_USB
- tristate "USB"
- depends on USB
- help
- Say Y here if you want to connect via USB to network transceiver.
-
- To compile this driver as a module, choose M here: the
- module will be called most_usb.
diff --git a/drivers/staging/most/usb/Makefile b/drivers/staging/most/usb/Makefile
deleted file mode 100644
index c2b2073..0000000
--- a/drivers/staging/most/usb/Makefile
+++ /dev/null
@@ -1,4 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_MOST_USB) += most_usb.o
-
-most_usb-objs := usb.o
diff --git a/drivers/staging/most/usb/usb.c b/drivers/staging/most/usb/usb.c
deleted file mode 100644
index 2640c5b..0000000
--- a/drivers/staging/most/usb/usb.c
+++ /dev/null
@@ -1,1170 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * usb.c - Hardware dependent module for USB
- *
- * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
- */
-
-#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 <linux/most.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 USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
-#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
-#define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */
-#define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */
-#define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */
-/* 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 most_dci_obj - Direct Communication Interface
- * @kobj:position in sysfs
- * @usb_device: pointer to the usb device
- * @reg_addr: register address for arbitrary DCI access
- */
-struct most_dci_obj {
- struct device dev;
- struct usb_device *usb_device;
- u16 reg_addr;
-};
-
-#define to_dci_obj(p) container_of(p, struct most_dci_obj, dev)
-
-struct most_dev;
-
-struct clear_hold_work {
- struct work_struct ws;
- struct most_dev *mdev;
- unsigned int channel;
- int pipe;
-};
-
-#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
-
-/**
- * struct most_dev - holds all usb interface specific stuff
- * @usb_device: pointer to usb device
- * @iface: hardware interface
- * @cap: channel capabilities
- * @conf: channel configuration
- * @dci: direct communication interface of hardware
- * @ep_address: endpoint address table
- * @description: device description
- * @suffix: suffix for channel name
- * @channel_lock: synchronize channel access
- * @padding_active: indicates channel uses padding
- * @is_channel_healthy: health status table of each channel
- * @busy_urbs: 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 device dev;
- 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 *ep_address;
- char description[MAX_STRING_LEN];
- char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
- spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
- bool padding_active[MAX_NUM_ENDPOINTS];
- bool is_channel_healthy[MAX_NUM_ENDPOINTS];
- struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
- struct usb_anchor *busy_urbs;
- struct mutex io_mutex;
- struct timer_list link_stat_timer;
- struct work_struct poll_work_obj;
- void (*on_netinfo)(struct most_interface *most_iface,
- unsigned char link_state, unsigned char *addrs);
-};
-
-#define to_mdev(d) container_of(d, struct most_dev, iface)
-#define to_mdev_from_dev(d) container_of(d, struct most_dev, dev)
-#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
-
-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;
- __le16 *dma_buf;
- u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
-
- dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
- if (!dma_buf)
- return -ENOMEM;
-
- retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
- DRCI_READ_REQ, req_type,
- 0x0000,
- reg, dma_buf, sizeof(*dma_buf), 5 * HZ);
- *buf = le16_to_cpu(*dma_buf);
- kfree(dma_buf);
-
- if (retval < 0)
- return retval;
- return 0;
-}
-
-/**
- * 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);
-}
-
-static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep)
-{
- return drci_wr_reg(usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, 1);
-}
-
-/**
- * get_stream_frame_size - calculate frame size of current configuration
- * @dev: device structure
- * @cfg: channel configuration
- */
-static unsigned int get_stream_frame_size(struct device *dev,
- struct most_channel_config *cfg)
-{
- unsigned int frame_size;
- unsigned int sub_size = cfg->subbuffer_size;
-
- if (!sub_size) {
- dev_warn(dev, "Misconfig: Subbuffer size zero.\n");
- return 0;
- }
- switch (cfg->data_type) {
- case MOST_CH_ISOC:
- frame_size = AV_PACKETS_PER_XACT * sub_size;
- break;
- case MOST_CH_SYNC:
- if (cfg->packets_per_xact == 0) {
- dev_warn(dev, "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:
- dev_warn(dev, "Query frame size of non-streaming channel\n");
- frame_size = 0;
- 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 = to_mdev(iface);
- unsigned long flags;
- spinlock_t *lock; /* temp. lock */
-
- if (channel < 0 || channel >= iface->num_channels) {
- dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
- return -ECHRNG;
- }
-
- lock = mdev->channel_lock + channel;
- spin_lock_irqsave(lock, flags);
- mdev->is_channel_healthy[channel] = false;
- spin_unlock_irqrestore(lock, flags);
-
- cancel_work_sync(&mdev->clear_work[channel].ws);
-
- mutex_lock(&mdev->io_mutex);
- usb_kill_anchored_urbs(&mdev->busy_urbs[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 frame_size = get_stream_frame_size(&mdev->dev, conf);
- unsigned int j, num_frames;
-
- if (!frame_size)
- return -EINVAL;
- num_frames = mbo->buffer_length / frame_size;
-
- if (num_frames < 1) {
- dev_err(&mdev->usb_device->dev,
- "Missed minimal transfer unit.\n");
- return -EINVAL;
- }
-
- for (j = num_frames - 1; j > 0; j--)
- memmove(mbo->virt_address + j * USB_MTU,
- mbo->virt_address + j * frame_size,
- 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)
-{
- struct most_channel_config *const conf = &mdev->conf[channel];
- unsigned int frame_size = get_stream_frame_size(&mdev->dev, conf);
- unsigned int j, num_frames;
-
- if (!frame_size)
- return -EINVAL;
- 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 = urb->context;
- struct most_dev *mdev = to_mdev(mbo->ifp);
- unsigned int channel = mbo->hdm_channel_id;
- spinlock_t *lock = mdev->channel_lock + channel;
- unsigned long flags;
-
- spin_lock_irqsave(lock, flags);
-
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- if (likely(mdev->is_channel_healthy[channel])) {
- switch (urb->status) {
- case 0:
- case -ESHUTDOWN:
- mbo->processed_length = urb->actual_length;
- mbo->status = MBO_SUCCESS;
- break;
- case -EPIPE:
- dev_warn(&mdev->usb_device->dev,
- "Broken pipe on ep%02x\n",
- mdev->ep_address[channel]);
- mdev->is_channel_healthy[channel] = false;
- mdev->clear_work[channel].pipe = urb->pipe;
- schedule_work(&mdev->clear_work[channel].ws);
- break;
- case -ENODEV:
- case -EPROTO:
- mbo->status = MBO_E_CLOSE;
- break;
- }
- }
-
- spin_unlock_irqrestore(lock, flags);
-
- 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!
- */
-static void hdm_read_completion(struct urb *urb)
-{
- struct mbo *mbo = urb->context;
- struct most_dev *mdev = to_mdev(mbo->ifp);
- unsigned int channel = mbo->hdm_channel_id;
- struct device *dev = &mdev->usb_device->dev;
- spinlock_t *lock = mdev->channel_lock + channel;
- unsigned long flags;
-
- spin_lock_irqsave(lock, flags);
-
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- if (likely(mdev->is_channel_healthy[channel])) {
- switch (urb->status) {
- case 0:
- case -ESHUTDOWN:
- mbo->processed_length = urb->actual_length;
- mbo->status = MBO_SUCCESS;
- if (mdev->padding_active[channel] &&
- hdm_remove_padding(mdev, channel, mbo)) {
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- }
- break;
- case -EPIPE:
- dev_warn(dev, "Broken pipe on ep%02x\n",
- mdev->ep_address[channel]);
- mdev->is_channel_healthy[channel] = false;
- mdev->clear_work[channel].pipe = urb->pipe;
- schedule_work(&mdev->clear_work[channel].ws);
- break;
- case -ENODEV:
- case -EPROTO:
- mbo->status = MBO_E_CLOSE;
- break;
- case -EOVERFLOW:
- dev_warn(dev, "Babble on ep%02x\n",
- mdev->ep_address[channel]);
- break;
- }
- }
-
- spin_unlock_irqrestore(lock, flags);
-
- 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 = to_mdev(iface);
- struct most_channel_config *conf;
- int retval = 0;
- struct urb *urb;
- unsigned long length;
- void *virt_address;
-
- if (!mbo)
- return -EINVAL;
- if (iface->num_channels <= channel || channel < 0)
- return -ECHRNG;
-
- urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_KERNEL);
- if (!urb)
- return -ENOMEM;
-
- conf = &mdev->conf[channel];
-
- mutex_lock(&mdev->io_mutex);
- if (!mdev->usb_device) {
- retval = -ENODEV;
- goto err_free_urb;
- }
-
- if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
- hdm_add_padding(mdev, channel, mbo)) {
- retval = -EINVAL;
- goto err_free_urb;
- }
-
- 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 &&
- conf->data_type != MOST_CH_SYNC)
- 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;
-
- usb_anchor_urb(urb, &mdev->busy_urbs[channel]);
-
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (retval) {
- dev_err(&mdev->usb_device->dev,
- "URB submit failed with error %d.\n", retval);
- goto err_unanchor_urb;
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-
-err_unanchor_urb:
- usb_unanchor_urb(urb);
-err_free_urb:
- usb_free_urb(urb);
- mutex_unlock(&mdev->io_mutex);
- return retval;
-}
-
-static void *hdm_dma_alloc(struct mbo *mbo, u32 size)
-{
- struct most_dev *mdev = to_mdev(mbo->ifp);
-
- return usb_alloc_coherent(mdev->usb_device, size, GFP_KERNEL,
- &mbo->bus_address);
-}
-
-static void hdm_dma_free(struct mbo *mbo, u32 size)
-{
- struct most_dev *mdev = to_mdev(mbo->ifp);
-
- usb_free_coherent(mdev->usb_device, size, mbo->virt_address,
- mbo->bus_address);
-}
-
-/**
- * hdm_configure_channel - receive channel configuration from core
- * @iface: interface
- * @channel: channel ID
- * @conf: structure that holds the configuration information
- *
- * The attached network interface controller (NIC) supports a padding mode
- * to avoid short packets on USB, hence increasing the performance due to a
- * lower interrupt load. This mode is default for synchronous data and can
- * be switched on for isochronous data. In case padding is active the
- * driver needs to know the frame size of the payload in order to calculate
- * the number of bytes it needs to pad when transmitting or to cut off when
- * receiving data.
- *
- */
-static int hdm_configure_channel(struct most_interface *iface, int channel,
- struct most_channel_config *conf)
-{
- unsigned int num_frames;
- unsigned int frame_size;
- struct most_dev *mdev = to_mdev(iface);
- struct device *dev = &mdev->usb_device->dev;
-
- if (!conf) {
- dev_err(dev, "Bad config pointer.\n");
- return -EINVAL;
- }
- if (channel < 0 || channel >= iface->num_channels) {
- dev_err(dev, "Channel ID out of range.\n");
- return -EINVAL;
- }
-
- mdev->is_channel_healthy[channel] = true;
- mdev->clear_work[channel].channel = channel;
- mdev->clear_work[channel].mdev = mdev;
- INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
-
- 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 &&
- conf->packets_per_xact != 0xFF)) {
- mdev->padding_active[channel] = false;
- /*
- * Since the NIC's padding mode is not going to be
- * used, we can skip the frame size calculations and
- * move directly on to exit.
- */
- goto exit;
- }
-
- mdev->padding_active[channel] = true;
-
- frame_size = get_stream_frame_size(&mdev->dev, conf);
- if (frame_size == 0 || frame_size > USB_MTU) {
- dev_warn(dev, "Misconfig: frame size wrong\n");
- return -EINVAL;
- }
-
- num_frames = conf->buffer_size / frame_size;
-
- if (conf->buffer_size % frame_size) {
- u16 old_size = conf->buffer_size;
-
- conf->buffer_size = num_frames * frame_size;
- dev_warn(dev, "%s: fixed buffer size (%d -> %d)\n",
- mdev->suffix[channel], old_size, conf->buffer_size);
- }
-
- /* calculate extra length to comply w/ HW padding */
- conf->extra_len = num_frames * (USB_MTU - frame_size);
-
-exit:
- mdev->conf[channel] = *conf;
- if (conf->data_type == MOST_CH_ASYNC) {
- u16 ep = mdev->ep_address[channel];
-
- if (start_sync_ep(mdev->usb_device, ep) < 0)
- dev_warn(dev, "sync for ep%02x failed", ep);
- }
- 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,
- void (*on_netinfo)(struct most_interface *,
- unsigned char,
- unsigned char *))
-{
- struct most_dev *mdev = to_mdev(iface);
-
- mdev->on_netinfo = on_netinfo;
- if (!on_netinfo)
- return;
-
- mdev->link_stat_timer.expires = jiffies + HZ;
- mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
-}
-
-/**
- * link_stat_timer_handler - schedule work obtaining mac address and link status
- * @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(struct timer_list *t)
-{
- struct most_dev *mdev = from_timer(mdev, t, link_stat_timer);
-
- schedule_work(&mdev->poll_work_obj);
- mdev->link_stat_timer.expires = jiffies + (2 * HZ);
- add_timer(&mdev->link_stat_timer);
-}
-
-/**
- * wq_netinfo - work queue function to deliver latest networking information
- * @wq_obj: object that holds data for our deferred work to do
- *
- * This retrieves the network interface status of the USB INIC
- */
-static void wq_netinfo(struct work_struct *wq_obj)
-{
- struct most_dev *mdev = to_mdev_from_work(wq_obj);
- struct usb_device *usb_device = mdev->usb_device;
- struct device *dev = &usb_device->dev;
- u16 hi, mi, lo, link;
- u8 hw_addr[6];
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi)) {
- dev_err(dev, "Vendor request 'hw_addr_hi' failed\n");
- return;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi)) {
- dev_err(dev, "Vendor request 'hw_addr_mid' failed\n");
- return;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo)) {
- dev_err(dev, "Vendor request 'hw_addr_low' failed\n");
- return;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link)) {
- dev_err(dev, "Vendor request 'link status' failed\n");
- return;
- }
-
- hw_addr[0] = hi >> 8;
- hw_addr[1] = hi;
- hw_addr[2] = mi >> 8;
- hw_addr[3] = mi;
- hw_addr[4] = lo >> 8;
- hw_addr[5] = lo;
-
- if (mdev->on_netinfo)
- mdev->on_netinfo(&mdev->iface, link, hw_addr);
-}
-
-/**
- * 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 clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
- struct most_dev *mdev = clear_work->mdev;
- unsigned int channel = clear_work->channel;
- int pipe = clear_work->pipe;
- int snd_pipe;
- int peer;
-
- mutex_lock(&mdev->io_mutex);
- most_stop_enqueue(&mdev->iface, channel);
- usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
- if (usb_clear_halt(mdev->usb_device, pipe))
- dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
-
- /* If the functional Stall condition has been set on an
- * asynchronous rx channel, we need to clear the tx channel
- * too, since the hardware runs its clean-up sequence on both
- * channels, as they are physically one on the network.
- *
- * The USB interface that exposes the asynchronous channels
- * contains always two endpoints, and two only.
- */
- if (mdev->conf[channel].data_type == MOST_CH_ASYNC &&
- mdev->conf[channel].direction == MOST_CH_RX) {
- if (channel == 0)
- peer = 1;
- else
- peer = 0;
- snd_pipe = usb_sndbulkpipe(mdev->usb_device,
- mdev->ep_address[peer]);
- usb_clear_halt(mdev->usb_device, snd_pipe);
- }
- mdev->is_channel_healthy[channel] = true;
- most_resume_enqueue(&mdev->iface, channel);
- mutex_unlock(&mdev->io_mutex);
-}
-
-/**
- * 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 const struct usb_device_id usbid[] = {
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
- { } /* Terminating entry */
-};
-
-struct regs {
- const char *name;
- u16 reg;
-};
-
-static const struct regs ro_regs[] = {
- { "ni_state", DRCI_REG_NI_STATE },
- { "packet_bandwidth", DRCI_REG_PACKET_BW },
- { "node_address", DRCI_REG_NODE_ADDR },
- { "node_position", DRCI_REG_NODE_POS },
-};
-
-static const struct regs rw_regs[] = {
- { "mep_filter", DRCI_REG_MEP_FILTER },
- { "mep_hash0", DRCI_REG_HASH_TBL0 },
- { "mep_hash1", DRCI_REG_HASH_TBL1 },
- { "mep_hash2", DRCI_REG_HASH_TBL2 },
- { "mep_hash3", DRCI_REG_HASH_TBL3 },
- { "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
- { "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
- { "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
-};
-
-static int get_stat_reg_addr(const struct regs *regs, int size,
- const char *name, u16 *reg_addr)
-{
- int i;
-
- for (i = 0; i < size; i++) {
- if (sysfs_streq(name, regs[i].name)) {
- *reg_addr = regs[i].reg;
- return 0;
- }
- }
- return -EINVAL;
-}
-
-#define get_static_reg_addr(regs, name, reg_addr) \
- get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
-
-static ssize_t value_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- const char *name = attr->attr.name;
- struct most_dci_obj *dci_obj = to_dci_obj(dev);
- u16 val;
- u16 reg_addr;
- int err;
-
- if (sysfs_streq(name, "arb_address"))
- return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
-
- if (sysfs_streq(name, "arb_value"))
- reg_addr = dci_obj->reg_addr;
- else if (get_static_reg_addr(ro_regs, name, ®_addr) &&
- get_static_reg_addr(rw_regs, name, ®_addr))
- return -EINVAL;
-
- err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
- if (err < 0)
- return err;
-
- return snprintf(buf, PAGE_SIZE, "%04x\n", val);
-}
-
-static ssize_t value_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- u16 val;
- u16 reg_addr;
- const char *name = attr->attr.name;
- struct most_dci_obj *dci_obj = to_dci_obj(dev);
- struct usb_device *usb_dev = dci_obj->usb_device;
- int err;
-
- err = kstrtou16(buf, 16, &val);
- if (err)
- return err;
-
- if (sysfs_streq(name, "arb_address")) {
- dci_obj->reg_addr = val;
- return count;
- }
-
- if (sysfs_streq(name, "arb_value"))
- err = drci_wr_reg(usb_dev, dci_obj->reg_addr, val);
- else if (sysfs_streq(name, "sync_ep"))
- err = start_sync_ep(usb_dev, val);
- else if (!get_static_reg_addr(rw_regs, name, ®_addr))
- err = drci_wr_reg(usb_dev, reg_addr, val);
- else
- return -EINVAL;
-
- if (err < 0)
- return err;
-
- return count;
-}
-
-static DEVICE_ATTR(ni_state, 0444, value_show, NULL);
-static DEVICE_ATTR(packet_bandwidth, 0444, value_show, NULL);
-static DEVICE_ATTR(node_address, 0444, value_show, NULL);
-static DEVICE_ATTR(node_position, 0444, value_show, NULL);
-static DEVICE_ATTR(sync_ep, 0200, NULL, value_store);
-static DEVICE_ATTR(mep_filter, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_hash0, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_hash1, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_hash2, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_hash3, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_eui48_hi, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_eui48_mi, 0644, value_show, value_store);
-static DEVICE_ATTR(mep_eui48_lo, 0644, value_show, value_store);
-static DEVICE_ATTR(arb_address, 0644, value_show, value_store);
-static DEVICE_ATTR(arb_value, 0644, value_show, value_store);
-
-static struct attribute *dci_attrs[] = {
- &dev_attr_ni_state.attr,
- &dev_attr_packet_bandwidth.attr,
- &dev_attr_node_address.attr,
- &dev_attr_node_position.attr,
- &dev_attr_sync_ep.attr,
- &dev_attr_mep_filter.attr,
- &dev_attr_mep_hash0.attr,
- &dev_attr_mep_hash1.attr,
- &dev_attr_mep_hash2.attr,
- &dev_attr_mep_hash3.attr,
- &dev_attr_mep_eui48_hi.attr,
- &dev_attr_mep_eui48_mi.attr,
- &dev_attr_mep_eui48_lo.attr,
- &dev_attr_arb_address.attr,
- &dev_attr_arb_value.attr,
- NULL,
-};
-
-ATTRIBUTE_GROUPS(dci);
-
-static void release_dci(struct device *dev)
-{
- struct most_dci_obj *dci = to_dci_obj(dev);
-
- put_device(dev->parent);
- kfree(dci);
-}
-
-static void release_mdev(struct device *dev)
-{
- struct most_dev *mdev = to_mdev_from_dev(dev);
-
- kfree(mdev);
-}
-/**
- * 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)
-{
- struct usb_host_interface *usb_iface_desc = interface->cur_altsetting;
- struct usb_device *usb_dev = interface_to_usbdev(interface);
- struct device *dev = &usb_dev->dev;
- struct most_dev *mdev;
- unsigned int i;
- unsigned int num_endpoints;
- struct most_channel_capability *tmp_cap;
- struct usb_endpoint_descriptor *ep_desc;
- int ret = -ENOMEM;
-
- mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
- if (!mdev)
- return -ENOMEM;
-
- usb_set_intfdata(interface, mdev);
- num_endpoints = usb_iface_desc->desc.bNumEndpoints;
- if (num_endpoints > MAX_NUM_ENDPOINTS) {
- kfree(mdev);
- return -EINVAL;
- }
- mutex_init(&mdev->io_mutex);
- INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
- timer_setup(&mdev->link_stat_timer, link_stat_timer_handler, 0);
-
- mdev->usb_device = usb_dev;
- mdev->link_stat_timer.expires = jiffies + (2 * HZ);
-
- mdev->iface.mod = hdm_usb_fops.owner;
- mdev->iface.dev = &mdev->dev;
- mdev->iface.driver_dev = &interface->dev;
- 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.dma_alloc = hdm_dma_alloc;
- mdev->iface.dma_free = hdm_dma_free;
- mdev->iface.description = mdev->description;
- mdev->iface.num_channels = num_endpoints;
-
- snprintf(mdev->description, sizeof(mdev->description),
- "%d-%s:%d.%d",
- usb_dev->bus->busnum,
- usb_dev->devpath,
- usb_dev->config->desc.bConfigurationValue,
- usb_iface_desc->desc.bInterfaceNumber);
-
- mdev->dev.init_name = mdev->description;
- mdev->dev.parent = &interface->dev;
- mdev->dev.release = release_mdev;
- mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
- if (!mdev->conf)
- goto err_free_mdev;
-
- mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
- if (!mdev->cap)
- goto err_free_conf;
-
- mdev->iface.channel_vector = mdev->cap;
- mdev->ep_address =
- kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
- if (!mdev->ep_address)
- goto err_free_cap;
-
- mdev->busy_urbs =
- kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
- if (!mdev->busy_urbs)
- goto err_free_ep_address;
-
- 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 | MOST_CH_SYNC;
- if (usb_endpoint_dir_in(ep_desc))
- tmp_cap->direction = MOST_CH_RX;
- else
- tmp_cap->direction = MOST_CH_TX;
- tmp_cap++;
- init_usb_anchor(&mdev->busy_urbs[i]);
- spin_lock_init(&mdev->channel_lock[i]);
- }
- dev_dbg(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_dbg(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);
-
- ret = most_register_interface(&mdev->iface);
- if (ret)
- goto err_free_busy_urbs;
-
- mutex_lock(&mdev->io_mutex);
- if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
- le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
- le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
- mdev->dci = kzalloc(sizeof(*mdev->dci), GFP_KERNEL);
- if (!mdev->dci) {
- mutex_unlock(&mdev->io_mutex);
- most_deregister_interface(&mdev->iface);
- ret = -ENOMEM;
- goto err_free_busy_urbs;
- }
-
- mdev->dci->dev.init_name = "dci";
- mdev->dci->dev.parent = get_device(mdev->iface.dev);
- mdev->dci->dev.groups = dci_groups;
- mdev->dci->dev.release = release_dci;
- if (device_register(&mdev->dci->dev)) {
- mutex_unlock(&mdev->io_mutex);
- most_deregister_interface(&mdev->iface);
- ret = -ENOMEM;
- goto err_free_dci;
- }
- mdev->dci->usb_device = mdev->usb_device;
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-err_free_dci:
- put_device(&mdev->dci->dev);
-err_free_busy_urbs:
- kfree(mdev->busy_urbs);
-err_free_ep_address:
- kfree(mdev->ep_address);
-err_free_cap:
- kfree(mdev->cap);
-err_free_conf:
- kfree(mdev->conf);
-err_free_mdev:
- put_device(&mdev->dev);
- 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 = 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);
-
- if (mdev->dci)
- device_unregister(&mdev->dci->dev);
- most_deregister_interface(&mdev->iface);
-
- kfree(mdev->busy_urbs);
- kfree(mdev->cap);
- kfree(mdev->conf);
- kfree(mdev->ep_address);
- put_device(&mdev->dci->dev);
- put_device(&mdev->dev);
-}
-
-static int hdm_suspend(struct usb_interface *interface, pm_message_t message)
-{
- struct most_dev *mdev = usb_get_intfdata(interface);
- int i;
-
- mutex_lock(&mdev->io_mutex);
- for (i = 0; i < mdev->iface.num_channels; i++) {
- most_stop_enqueue(&mdev->iface, i);
- usb_kill_anchored_urbs(&mdev->busy_urbs[i]);
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-}
-
-static int hdm_resume(struct usb_interface *interface)
-{
- struct most_dev *mdev = usb_get_intfdata(interface);
- int i;
-
- mutex_lock(&mdev->io_mutex);
- for (i = 0; i < mdev->iface.num_channels; i++)
- most_resume_enqueue(&mdev->iface, i);
- mutex_unlock(&mdev->io_mutex);
- return 0;
-}
-
-static struct usb_driver hdm_usb = {
- .name = "hdm_usb",
- .id_table = usbid,
- .probe = hdm_probe,
- .disconnect = hdm_disconnect,
- .resume = hdm_resume,
- .suspend = hdm_suspend,
-};
-
-module_usb_driver(hdm_usb);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Gromm <christian.gromm@xxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("HDM_4_USB");
--
2.7.4
