1308 lines
36 KiB
C
1308 lines
36 KiB
C
/*
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* hdm_usb.c - Hardware dependent module for USB
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*
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* Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This file is licensed under GPLv2.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/completion.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/sysfs.h>
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#include <linux/dma-mapping.h>
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#include <linux/etherdevice.h>
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#include <linux/uaccess.h>
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#include "mostcore.h"
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#define USB_MTU 512
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#define NO_ISOCHRONOUS_URB 0
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#define AV_PACKETS_PER_XACT 2
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#define BUF_CHAIN_SIZE 0xFFFF
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#define MAX_NUM_ENDPOINTS 30
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#define MAX_SUFFIX_LEN 10
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#define MAX_STRING_LEN 80
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#define MAX_BUF_SIZE 0xFFFF
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#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
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#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
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#define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */
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#define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */
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#define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */
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/* DRCI Addresses */
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#define DRCI_REG_NI_STATE 0x0100
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#define DRCI_REG_PACKET_BW 0x0101
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#define DRCI_REG_NODE_ADDR 0x0102
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#define DRCI_REG_NODE_POS 0x0103
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#define DRCI_REG_MEP_FILTER 0x0140
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#define DRCI_REG_HASH_TBL0 0x0141
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#define DRCI_REG_HASH_TBL1 0x0142
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#define DRCI_REG_HASH_TBL2 0x0143
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#define DRCI_REG_HASH_TBL3 0x0144
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#define DRCI_REG_HW_ADDR_HI 0x0145
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#define DRCI_REG_HW_ADDR_MI 0x0146
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#define DRCI_REG_HW_ADDR_LO 0x0147
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#define DRCI_REG_BASE 0x1100
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#define DRCI_COMMAND 0x02
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#define DRCI_READ_REQ 0xA0
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#define DRCI_WRITE_REQ 0xA1
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/**
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* struct most_dci_obj - Direct Communication Interface
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* @kobj:position in sysfs
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* @usb_device: pointer to the usb device
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* @reg_addr: register address for arbitrary DCI access
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*/
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struct most_dci_obj {
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struct kobject kobj;
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struct usb_device *usb_device;
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u16 reg_addr;
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};
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#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
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struct most_dev;
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struct clear_hold_work {
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struct work_struct ws;
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struct most_dev *mdev;
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unsigned int channel;
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int pipe;
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};
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#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
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/**
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* struct most_dev - holds all usb interface specific stuff
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* @parent: parent object in sysfs
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* @usb_device: pointer to usb device
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* @iface: hardware interface
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* @cap: channel capabilities
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* @conf: channel configuration
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* @dci: direct communication interface of hardware
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* @ep_address: endpoint address table
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* @description: device description
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* @suffix: suffix for channel name
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* @channel_lock: synchronize channel access
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* @padding_active: indicates channel uses padding
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* @is_channel_healthy: health status table of each channel
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* @busy_urbs: list of anchored items
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* @io_mutex: synchronize I/O with disconnect
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* @link_stat_timer: timer for link status reports
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* @poll_work_obj: work for polling link status
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*/
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struct most_dev {
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struct kobject *parent;
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struct usb_device *usb_device;
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struct most_interface iface;
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struct most_channel_capability *cap;
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struct most_channel_config *conf;
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struct most_dci_obj *dci;
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u8 *ep_address;
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char description[MAX_STRING_LEN];
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char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
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spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
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bool padding_active[MAX_NUM_ENDPOINTS];
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bool is_channel_healthy[MAX_NUM_ENDPOINTS];
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struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
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struct usb_anchor *busy_urbs;
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struct mutex io_mutex;
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struct timer_list link_stat_timer;
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struct work_struct poll_work_obj;
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void (*on_netinfo)(struct most_interface *, unsigned char,
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unsigned char *);
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};
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#define to_mdev(d) container_of(d, struct most_dev, iface)
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#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
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static void wq_clear_halt(struct work_struct *wq_obj);
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static void wq_netinfo(struct work_struct *wq_obj);
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/**
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* drci_rd_reg - read a DCI register
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* @dev: usb device
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* @reg: register address
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* @buf: buffer to store data
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*
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* This is reads data from INIC's direct register communication interface
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*/
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static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
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{
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int retval;
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__le16 *dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
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u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
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if (!dma_buf)
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return -ENOMEM;
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retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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DRCI_READ_REQ, req_type,
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0x0000,
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reg, dma_buf, sizeof(*dma_buf), 5 * HZ);
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*buf = le16_to_cpu(*dma_buf);
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kfree(dma_buf);
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return retval;
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}
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/**
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* drci_wr_reg - write a DCI register
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* @dev: usb device
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* @reg: register address
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* @data: data to write
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*
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* This is writes data to INIC's direct register communication interface
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*/
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static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
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{
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return usb_control_msg(dev,
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usb_sndctrlpipe(dev, 0),
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DRCI_WRITE_REQ,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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data,
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reg,
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NULL,
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0,
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5 * HZ);
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}
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static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep)
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{
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return drci_wr_reg(usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, 1);
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}
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/**
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* get_stream_frame_size - calculate frame size of current configuration
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* @cfg: channel configuration
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*/
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static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
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{
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unsigned int frame_size = 0;
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unsigned int sub_size = cfg->subbuffer_size;
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if (!sub_size) {
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pr_warn("Misconfig: Subbuffer size zero.\n");
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return frame_size;
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}
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switch (cfg->data_type) {
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case MOST_CH_ISOC:
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frame_size = AV_PACKETS_PER_XACT * sub_size;
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break;
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case MOST_CH_SYNC:
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if (cfg->packets_per_xact == 0) {
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pr_warn("Misconfig: Packets per XACT zero\n");
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frame_size = 0;
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} else if (cfg->packets_per_xact == 0xFF) {
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frame_size = (USB_MTU / sub_size) * sub_size;
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} else {
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frame_size = cfg->packets_per_xact * sub_size;
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}
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break;
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default:
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pr_warn("Query frame size of non-streaming channel\n");
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break;
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}
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return frame_size;
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}
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/**
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* hdm_poison_channel - mark buffers of this channel as invalid
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* @iface: pointer to the interface
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* @channel: channel ID
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*
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* This unlinks all URBs submitted to the HCD,
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* calls the associated completion function of the core and removes
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* them from the list.
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*
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* Returns 0 on success or error code otherwise.
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*/
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static int hdm_poison_channel(struct most_interface *iface, int channel)
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{
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struct most_dev *mdev = to_mdev(iface);
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unsigned long flags;
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spinlock_t *lock; /* temp. lock */
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if (unlikely(!iface)) {
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dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
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return -EIO;
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}
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if (unlikely(channel < 0 || channel >= iface->num_channels)) {
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dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
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return -ECHRNG;
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}
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lock = mdev->channel_lock + channel;
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spin_lock_irqsave(lock, flags);
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mdev->is_channel_healthy[channel] = false;
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spin_unlock_irqrestore(lock, flags);
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cancel_work_sync(&mdev->clear_work[channel].ws);
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mutex_lock(&mdev->io_mutex);
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usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
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if (mdev->padding_active[channel])
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mdev->padding_active[channel] = false;
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if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
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del_timer_sync(&mdev->link_stat_timer);
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cancel_work_sync(&mdev->poll_work_obj);
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}
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mutex_unlock(&mdev->io_mutex);
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return 0;
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}
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/**
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* hdm_add_padding - add padding bytes
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* @mdev: most device
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* @channel: channel ID
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* @mbo: buffer object
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*
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* This inserts the INIC hardware specific padding bytes into a streaming
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* channel's buffer
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*/
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static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
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{
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struct most_channel_config *conf = &mdev->conf[channel];
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unsigned int frame_size = get_stream_frame_size(conf);
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unsigned int j, num_frames;
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if (!frame_size)
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return -EIO;
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num_frames = mbo->buffer_length / frame_size;
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if (num_frames < 1) {
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dev_err(&mdev->usb_device->dev,
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"Missed minimal transfer unit.\n");
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return -EIO;
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}
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for (j = num_frames - 1; j > 0; j--)
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memmove(mbo->virt_address + j * USB_MTU,
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mbo->virt_address + j * frame_size,
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frame_size);
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mbo->buffer_length = num_frames * USB_MTU;
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return 0;
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}
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/**
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* hdm_remove_padding - remove padding bytes
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* @mdev: most device
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* @channel: channel ID
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* @mbo: buffer object
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*
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* This takes the INIC hardware specific padding bytes off a streaming
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* channel's buffer.
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*/
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static int hdm_remove_padding(struct most_dev *mdev, int channel,
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struct mbo *mbo)
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{
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struct most_channel_config *const conf = &mdev->conf[channel];
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unsigned int frame_size = get_stream_frame_size(conf);
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unsigned int j, num_frames;
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if (!frame_size)
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return -EIO;
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num_frames = mbo->processed_length / USB_MTU;
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for (j = 1; j < num_frames; j++)
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memmove(mbo->virt_address + frame_size * j,
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mbo->virt_address + USB_MTU * j,
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frame_size);
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mbo->processed_length = frame_size * num_frames;
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return 0;
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}
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/**
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* hdm_write_completion - completion function for submitted Tx URBs
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* @urb: the URB that has been completed
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*
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* This checks the status of the completed URB. In case the URB has been
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* unlinked before, it is immediately freed. On any other error the MBO
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* transfer flag is set. On success it frees allocated resources and calls
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* the completion function.
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*
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* Context: interrupt!
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*/
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static void hdm_write_completion(struct urb *urb)
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{
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struct mbo *mbo = urb->context;
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struct most_dev *mdev = to_mdev(mbo->ifp);
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unsigned int channel = mbo->hdm_channel_id;
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struct device *dev = &mdev->usb_device->dev;
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spinlock_t *lock = mdev->channel_lock + channel;
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unsigned long flags;
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spin_lock_irqsave(lock, flags);
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mbo->processed_length = 0;
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mbo->status = MBO_E_INVAL;
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if (likely(mdev->is_channel_healthy[channel])) {
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switch (urb->status) {
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case 0:
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case -ESHUTDOWN:
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mbo->processed_length = urb->actual_length;
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mbo->status = MBO_SUCCESS;
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break;
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case -EPIPE:
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dev_warn(dev, "Broken OUT pipe detected\n");
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mdev->is_channel_healthy[channel] = false;
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mdev->clear_work[channel].pipe = urb->pipe;
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schedule_work(&mdev->clear_work[channel].ws);
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break;
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case -ENODEV:
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case -EPROTO:
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mbo->status = MBO_E_CLOSE;
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break;
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}
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}
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spin_unlock_irqrestore(lock, flags);
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if (likely(mbo->complete))
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mbo->complete(mbo);
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usb_free_urb(urb);
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}
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/**
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* hdm_read_completion - completion function for submitted Rx URBs
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* @urb: the URB that has been completed
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*
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* This checks the status of the completed URB. In case the URB has been
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* unlinked before it is immediately freed. On any other error the MBO transfer
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* flag is set. On success it frees allocated resources, removes
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* padding bytes -if necessary- and calls the completion function.
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*
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* Context: interrupt!
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*
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* **************************************************************************
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* Error codes returned by in urb->status
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* or in iso_frame_desc[n].status (for ISO)
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* *************************************************************************
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*
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* USB device drivers may only test urb status values in completion handlers.
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* This is because otherwise there would be a race between HCDs updating
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* these values on one CPU, and device drivers testing them on another CPU.
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*
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* A transfer's actual_length may be positive even when an error has been
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* reported. That's because transfers often involve several packets, so that
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* one or more packets could finish before an error stops further endpoint I/O.
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*
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* For isochronous URBs, the urb status value is non-zero only if the URB is
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* unlinked, the device is removed, the host controller is disabled or the total
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* transferred length is less than the requested length and the URB_SHORT_NOT_OK
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* flag is set. Completion handlers for isochronous URBs should only see
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* urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
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* Individual frame descriptor status fields may report more status codes.
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*
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*
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* 0 Transfer completed successfully
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*
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* -ENOENT URB was synchronously unlinked by usb_unlink_urb
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*
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* -EINPROGRESS URB still pending, no results yet
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* (That is, if drivers see this it's a bug.)
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*
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* -EPROTO (*, **) a) bitstuff error
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* b) no response packet received within the
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* prescribed bus turn-around time
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* c) unknown USB error
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*
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* -EILSEQ (*, **) a) CRC mismatch
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* b) no response packet received within the
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* prescribed bus turn-around time
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* c) unknown USB error
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*
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* Note that often the controller hardware does not
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* distinguish among cases a), b), and c), so a
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* driver cannot tell whether there was a protocol
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* error, a failure to respond (often caused by
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* device disconnect), or some other fault.
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*
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* -ETIME (**) No response packet received within the prescribed
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* bus turn-around time. This error may instead be
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* reported as -EPROTO or -EILSEQ.
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*
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* -ETIMEDOUT Synchronous USB message functions use this code
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* to indicate timeout expired before the transfer
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* completed, and no other error was reported by HC.
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*
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* -EPIPE (**) Endpoint stalled. For non-control endpoints,
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* reset this status with usb_clear_halt().
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*
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* -ECOMM During an IN transfer, the host controller
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* received data from an endpoint faster than it
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* could be written to system memory
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*
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* -ENOSR During an OUT transfer, the host controller
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* could not retrieve data from system memory fast
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* enough to keep up with the USB data rate
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*
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* -EOVERFLOW (*) The amount of data returned by the endpoint was
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* greater than either the max packet size of the
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* endpoint or the remaining buffer size. "Babble".
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*
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* -EREMOTEIO The data read from the endpoint did not fill the
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* specified buffer, and URB_SHORT_NOT_OK was set in
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* urb->transfer_flags.
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*
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* -ENODEV Device was removed. Often preceded by a burst of
|
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* other errors, since the hub driver doesn't detect
|
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* device removal events immediately.
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*
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* -EXDEV ISO transfer only partially completed
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* (only set in iso_frame_desc[n].status, not urb->status)
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*
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* -EINVAL ISO madness, if this happens: Log off and go home
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*
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* -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
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*
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* -ESHUTDOWN The device or host controller has been disabled due
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* to some problem that could not be worked around,
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* such as a physical disconnect.
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*
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*
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* (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
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* hardware problems such as bad devices (including firmware) or cables.
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*
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* (**) This is also one of several codes that different kinds of host
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* controller use to indicate a transfer has failed because of device
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* disconnect. In the interval before the hub driver starts disconnect
|
|
* processing, devices may receive such fault reports for every request.
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*
|
|
* See <https://www.kernel.org/doc/Documentation/driver-api/usb/error-codes.rst>
|
|
*/
|
|
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 IN pipe detected\n");
|
|
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 IN pipe detected\n");
|
|
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;
|
|
struct most_channel_config *conf;
|
|
struct device *dev;
|
|
int retval = 0;
|
|
struct urb *urb;
|
|
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)
|
|
return -ENOMEM;
|
|
|
|
if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
|
|
hdm_add_padding(mdev, channel, mbo)) {
|
|
retval = -EIO;
|
|
goto _error;
|
|
}
|
|
|
|
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)
|
|
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(dev, "URB submit failed with error %d.\n", retval);
|
|
goto _error_1;
|
|
}
|
|
return 0;
|
|
|
|
_error_1:
|
|
usb_unanchor_urb(urb);
|
|
_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
|
|
*
|
|
* 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;
|
|
|
|
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 (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 &&
|
|
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(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;
|
|
|
|
BUG_ON(!iface);
|
|
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(unsigned long data)
|
|
{
|
|
struct most_dev *mdev = (struct most_dev *)data;
|
|
|
|
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) < 0) {
|
|
dev_err(dev, "Vendor request 'hw_addr_hi' failed\n");
|
|
return;
|
|
}
|
|
|
|
if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
|
|
dev_err(dev, "Vendor request 'hw_addr_mid' failed\n");
|
|
return;
|
|
}
|
|
|
|
if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
|
|
dev_err(dev, "Vendor request 'hw_addr_low' failed\n");
|
|
return;
|
|
}
|
|
|
|
if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
|
|
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;
|
|
|
|
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");
|
|
|
|
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 */
|
|
};
|
|
|
|
#define MOST_DCI_RO_ATTR(_name) \
|
|
struct most_dci_attribute most_dci_attr_##_name = \
|
|
__ATTR(_name, 0444, show_value, NULL)
|
|
|
|
#define MOST_DCI_ATTR(_name) \
|
|
struct most_dci_attribute most_dci_attr_##_name = \
|
|
__ATTR(_name, 0644, show_value, store_value)
|
|
|
|
#define MOST_DCI_WO_ATTR(_name) \
|
|
struct most_dci_attribute most_dci_attr_##_name = \
|
|
__ATTR(_name, 0200, NULL, 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);
|
|
}
|
|
|
|
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 (!strcmp(name, regs[i].name)) {
|
|
*reg_addr = regs[i].reg;
|
|
return 0;
|
|
}
|
|
}
|
|
return -EFAULT;
|
|
}
|
|
|
|
#define get_static_reg_addr(regs, name, reg_addr) \
|
|
get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
|
|
|
|
static ssize_t show_value(struct most_dci_obj *dci_obj,
|
|
struct most_dci_attribute *attr, char *buf)
|
|
{
|
|
const char *name = attr->attr.name;
|
|
u16 val;
|
|
u16 reg_addr;
|
|
int err;
|
|
|
|
if (!strcmp(name, "arb_address"))
|
|
return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
|
|
|
|
if (!strcmp(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 -EFAULT;
|
|
|
|
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 store_value(struct most_dci_obj *dci_obj,
|
|
struct most_dci_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
u16 val;
|
|
u16 reg_addr;
|
|
const char *name = attr->attr.name;
|
|
struct usb_device *usb_dev = dci_obj->usb_device;
|
|
int err = kstrtou16(buf, 16, &val);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
if (!strcmp(name, "arb_address")) {
|
|
dci_obj->reg_addr = val;
|
|
return count;
|
|
}
|
|
|
|
if (!strcmp(name, "arb_value"))
|
|
err = drci_wr_reg(usb_dev, dci_obj->reg_addr, val);
|
|
else if (!strcmp(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 -EFAULT;
|
|
|
|
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_WO_ATTR(sync_ep);
|
|
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);
|
|
static MOST_DCI_ATTR(arb_address);
|
|
static MOST_DCI_ATTR(arb_value);
|
|
|
|
/**
|
|
* 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_sync_ep.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,
|
|
&most_dci_attr_arb_address.attr,
|
|
&most_dci_attr_arb_value.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 = kzalloc(sizeof(*most_dci), GFP_KERNEL);
|
|
int retval;
|
|
|
|
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)
|
|
{
|
|
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 = kzalloc(sizeof(*mdev), GFP_KERNEL);
|
|
unsigned int i;
|
|
unsigned int num_endpoints;
|
|
struct most_channel_capability *tmp_cap;
|
|
struct usb_endpoint_descriptor *ep_desc;
|
|
int ret = 0;
|
|
|
|
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->busy_urbs =
|
|
kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
|
|
if (!mdev->busy_urbs)
|
|
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 | 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_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_OS81118 ||
|
|
le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
|
|
le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
|
|
/* 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->busy_urbs);
|
|
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 = 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->busy_urbs);
|
|
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,
|
|
};
|
|
|
|
module_usb_driver(hdm_usb);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
|
|
MODULE_DESCRIPTION("HDM_4_USB");
|