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1171 lines
32 KiB
1171 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* 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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|
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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 <linux/most.h> |
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|
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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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|
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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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/** |
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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 device dev; |
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struct usb_device *usb_device; |
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u16 reg_addr; |
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}; |
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|
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#define to_dci_obj(p) container_of(p, struct most_dci_obj, dev) |
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struct most_dev; |
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|
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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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/** |
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* struct most_dev - holds all usb interface specific stuff |
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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 device dev; |
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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 *most_iface, |
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unsigned char link_state, unsigned char *addrs); |
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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_dev(d) container_of(d, struct most_dev, dev) |
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#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj) |
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|
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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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/** |
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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; |
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u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE; |
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|
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dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL); |
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if (!dma_buf) |
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return -ENOMEM; |
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|
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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), |
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USB_CTRL_GET_TIMEOUT); |
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*buf = le16_to_cpu(*dma_buf); |
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kfree(dma_buf); |
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|
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if (retval < 0) |
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return retval; |
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return 0; |
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} |
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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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USB_CTRL_SET_TIMEOUT); |
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} |
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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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/** |
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* get_stream_frame_size - calculate frame size of current configuration |
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* @dev: device structure |
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* @cfg: channel configuration |
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*/ |
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static unsigned int get_stream_frame_size(struct device *dev, |
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struct most_channel_config *cfg) |
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{ |
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unsigned int frame_size; |
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unsigned int sub_size = cfg->subbuffer_size; |
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|
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if (!sub_size) { |
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dev_warn(dev, "Misconfig: Subbuffer size zero.\n"); |
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return 0; |
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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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dev_warn(dev, "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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dev_warn(dev, "Query frame size of non-streaming channel\n"); |
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frame_size = 0; |
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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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/** |
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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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|
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if (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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|
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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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|
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cancel_work_sync(&mdev->clear_work[channel].ws); |
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|
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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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|
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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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/** |
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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(&mdev->dev, conf); |
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unsigned int j, num_frames; |
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if (!frame_size) |
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return -EINVAL; |
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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 -EINVAL; |
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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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/** |
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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(&mdev->dev, conf); |
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unsigned int j, num_frames; |
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|
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if (!frame_size) |
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return -EINVAL; |
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num_frames = mbo->processed_length / USB_MTU; |
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|
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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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|
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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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/** |
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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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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: |
|
case -ESHUTDOWN: |
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mbo->processed_length = urb->actual_length; |
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mbo->status = MBO_SUCCESS; |
|
break; |
|
case -EPIPE: |
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dev_warn(&mdev->usb_device->dev, |
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"Broken pipe on ep%02x\n", |
|
mdev->ep_address[channel]); |
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mdev->is_channel_healthy[channel] = false; |
|
mdev->clear_work[channel].pipe = urb->pipe; |
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schedule_work(&mdev->clear_work[channel].ws); |
|
break; |
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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. |
|
* |
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* 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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 <[email protected]>"); |
|
MODULE_DESCRIPTION("HDM_4_USB");
|
|
|