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-rw-r--r--drivers/staging/dgrp/dgrp_dpa_ops.c534
1 files changed, 0 insertions, 534 deletions
diff --git a/drivers/staging/dgrp/dgrp_dpa_ops.c b/drivers/staging/dgrp/dgrp_dpa_ops.c
deleted file mode 100644
index 69bfe309376d..000000000000
--- a/drivers/staging/dgrp/dgrp_dpa_ops.c
+++ /dev/null
@@ -1,534 +0,0 @@
-/*
- *
- * Copyright 1999 Digi International (www.digi.com)
- * James Puzzo <jamesp at digi dot com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
- * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
- * PURPOSE. See the GNU General Public License for more details.
- *
- */
-
-/*
- *
- * Filename:
- *
- * dgrp_dpa_ops.c
- *
- * Description:
- *
- * Handle the file operations required for the "dpa" devices.
- * Includes those functions required to register the "dpa" devices
- * in "/proc".
- *
- * Author:
- *
- * James A. Puzzo
- *
- */
-
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/tty.h>
-#include <linux/poll.h>
-#include <linux/cred.h>
-#include <linux/sched.h>
-#include <linux/ratelimit.h>
-#include <linux/slab.h>
-#include <asm/unaligned.h>
-
-#include "dgrp_common.h"
-
-/* File operation declarations */
-static int dgrp_dpa_open(struct inode *, struct file *);
-static int dgrp_dpa_release(struct inode *, struct file *);
-static ssize_t dgrp_dpa_read(struct file *, char __user *, size_t, loff_t *);
-static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg);
-static unsigned int dgrp_dpa_select(struct file *, struct poll_table_struct *);
-
-const struct file_operations dgrp_dpa_ops = {
- .owner = THIS_MODULE,
- .read = dgrp_dpa_read,
- .poll = dgrp_dpa_select,
- .unlocked_ioctl = dgrp_dpa_ioctl,
- .open = dgrp_dpa_open,
- .release = dgrp_dpa_release,
-};
-
-struct digi_node {
- uint nd_state; /* Node state: 1 = up, 0 = down. */
- uint nd_chan_count; /* Number of channels found */
- uint nd_tx_byte; /* Tx data count */
- uint nd_rx_byte; /* RX data count */
- u8 nd_ps_desc[MAX_DESC_LEN]; /* Description from PS */
-};
-
-#define DIGI_GETNODE (('d'<<8) | 249) /* get board info */
-
-
-struct digi_chan {
- uint ch_port; /* Port number to get info on */
- uint ch_open; /* 1 if open, 0 if not */
- uint ch_txcount; /* TX data count */
- uint ch_rxcount; /* RX data count */
- uint ch_s_brate; /* Realport BRATE */
- uint ch_s_estat; /* Realport ELAST */
- uint ch_s_cflag; /* Realport CFLAG */
- uint ch_s_iflag; /* Realport IFLAG */
- uint ch_s_oflag; /* Realport OFLAG */
- uint ch_s_xflag; /* Realport XFLAG */
- uint ch_s_mstat; /* Realport MLAST */
-};
-
-#define DIGI_GETCHAN (('d'<<8) | 248) /* get channel info */
-
-
-struct digi_vpd {
- int vpd_len;
- char vpd_data[VPDSIZE];
-};
-
-#define DIGI_GETVPD (('d'<<8) | 246) /* get VPD info */
-
-
-struct digi_debug {
- int onoff;
- int port;
-};
-
-#define DIGI_SETDEBUG (('d'<<8) | 247) /* set debug info */
-
-
-/*
- * dgrp_dpa_open -- open the DPA device for a particular PortServer
- */
-static int dgrp_dpa_open(struct inode *inode, struct file *file)
-{
- struct nd_struct *nd;
- int rtn = 0;
-
- rtn = try_module_get(THIS_MODULE);
- if (!rtn)
- return -ENXIO;
-
- rtn = 0;
-
- if (!capable(CAP_SYS_ADMIN)) {
- rtn = -EPERM;
- goto done;
- }
-
- /*
- * Make sure that the "private_data" field hasn't already been used.
- */
- if (file->private_data) {
- rtn = -EINVAL;
- goto done;
- }
-
- /*
- * Get the node pointer, and fail if it doesn't exist.
- */
- nd = PDE_DATA(inode);
- if (!nd) {
- rtn = -ENXIO;
- goto done;
- }
-
- file->private_data = (void *) nd;
-
- /*
- * Allocate the DPA buffer.
- */
-
- if (nd->nd_dpa_buf) {
- rtn = -EBUSY;
- } else {
- nd->nd_dpa_buf = kmalloc(DPA_MAX, GFP_KERNEL);
-
- if (!nd->nd_dpa_buf) {
- rtn = -ENOMEM;
- } else {
- nd->nd_dpa_out = 0;
- nd->nd_dpa_in = 0;
- nd->nd_dpa_lbolt = jiffies;
- }
- }
-
-done:
-
- if (rtn)
- module_put(THIS_MODULE);
- return rtn;
-}
-
-/*
- * dgrp_dpa_release -- close the DPA device for a particular PortServer
- */
-static int dgrp_dpa_release(struct inode *inode, struct file *file)
-{
- struct nd_struct *nd;
- u8 *buf;
- unsigned long lock_flags;
-
- /*
- * Get the node pointer, and quit if it doesn't exist.
- */
- nd = (struct nd_struct *)(file->private_data);
- if (!nd)
- goto done;
-
- /*
- * Free the dpa buffer.
- */
-
- spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
-
- buf = nd->nd_dpa_buf;
-
- nd->nd_dpa_buf = NULL;
- nd->nd_dpa_out = nd->nd_dpa_in;
-
- /*
- * Wakeup any thread waiting for buffer space.
- */
-
- if (nd->nd_dpa_flag & DPA_WAIT_SPACE) {
- nd->nd_dpa_flag &= ~DPA_WAIT_SPACE;
- wake_up_interruptible(&nd->nd_dpa_wqueue);
- }
-
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
-
- kfree(buf);
-
-done:
- module_put(THIS_MODULE);
- file->private_data = NULL;
- return 0;
-}
-
-/*
- * dgrp_dpa_read
- *
- * Copy data from the monitoring buffer to the user, freeing space
- * in the monitoring buffer for more messages
- */
-static ssize_t dgrp_dpa_read(struct file *file, char __user *buf, size_t count,
- loff_t *ppos)
-{
- struct nd_struct *nd;
- int n;
- int r;
- int offset = 0;
- int res = 0;
- ssize_t rtn;
- unsigned long lock_flags;
-
- /*
- * Get the node pointer, and quit if it doesn't exist.
- */
- nd = (struct nd_struct *)(file->private_data);
- if (!nd)
- return -ENXIO;
-
- /*
- * Wait for some data to appear in the buffer.
- */
-
- spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
-
- for (;;) {
- n = (nd->nd_dpa_in - nd->nd_dpa_out) & DPA_MASK;
-
- if (n != 0)
- break;
-
- nd->nd_dpa_flag |= DPA_WAIT_DATA;
-
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
-
- /*
- * Go to sleep waiting until the condition becomes true.
- */
- rtn = wait_event_interruptible(nd->nd_dpa_wqueue,
- ((nd->nd_dpa_flag & DPA_WAIT_DATA) == 0));
-
- if (rtn)
- return rtn;
-
- spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
- }
-
- /*
- * Read whatever is there.
- */
-
- if (n > count)
- n = count;
-
- res = n;
-
- r = DPA_MAX - nd->nd_dpa_out;
-
- if (r <= n) {
-
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
- rtn = copy_to_user((void __user *)buf,
- nd->nd_dpa_buf + nd->nd_dpa_out, r);
- spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
-
- if (rtn) {
- rtn = -EFAULT;
- goto done;
- }
-
- nd->nd_dpa_out = 0;
- n -= r;
- offset = r;
- }
-
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
- rtn = copy_to_user((void __user *)buf + offset,
- nd->nd_dpa_buf + nd->nd_dpa_out, n);
- spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
-
- if (rtn) {
- rtn = -EFAULT;
- goto done;
- }
-
- nd->nd_dpa_out += n;
-
- *ppos += res;
-
- rtn = res;
-
- /*
- * Wakeup any thread waiting for buffer space.
- */
-
- n = (nd->nd_dpa_in - nd->nd_dpa_out) & DPA_MASK;
-
- if (nd->nd_dpa_flag & DPA_WAIT_SPACE &&
- (DPA_MAX - n) > DPA_HIGH_WATER) {
- nd->nd_dpa_flag &= ~DPA_WAIT_SPACE;
- wake_up_interruptible(&nd->nd_dpa_wqueue);
- }
-
- done:
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
- return rtn;
-}
-
-static unsigned int dgrp_dpa_select(struct file *file,
- struct poll_table_struct *table)
-{
- unsigned int retval = 0;
- struct nd_struct *nd = file->private_data;
-
- if (nd->nd_dpa_out != nd->nd_dpa_in)
- retval |= POLLIN | POLLRDNORM; /* Conditionally readable */
-
- retval |= POLLOUT | POLLWRNORM; /* Always writeable */
-
- return retval;
-}
-
-static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
-
- struct nd_struct *nd;
- struct digi_chan getchan;
- struct digi_node getnode;
- struct ch_struct *ch;
- struct digi_debug setdebug;
- struct digi_vpd vpd;
- unsigned int port;
- void __user *uarg = (void __user *) arg;
-
- nd = file->private_data;
-
- switch (cmd) {
- case DIGI_GETCHAN:
- if (copy_from_user(&getchan, uarg, sizeof(struct digi_chan)))
- return -EFAULT;
-
- port = getchan.ch_port;
-
- if (port > nd->nd_chan_count)
- return -EINVAL;
-
- ch = nd->nd_chan + port;
-
- getchan.ch_open = (ch->ch_open_count > 0) ? 1 : 0;
- getchan.ch_txcount = ch->ch_txcount;
- getchan.ch_rxcount = ch->ch_rxcount;
- getchan.ch_s_brate = ch->ch_s_brate;
- getchan.ch_s_estat = ch->ch_s_elast;
- getchan.ch_s_cflag = ch->ch_s_cflag;
- getchan.ch_s_iflag = ch->ch_s_iflag;
- getchan.ch_s_oflag = ch->ch_s_oflag;
- getchan.ch_s_xflag = ch->ch_s_xflag;
- getchan.ch_s_mstat = ch->ch_s_mlast;
-
- if (copy_to_user(uarg, &getchan, sizeof(struct digi_chan)))
- return -EFAULT;
- break;
-
-
- case DIGI_GETNODE:
- getnode.nd_state = (nd->nd_state & NS_READY) ? 1 : 0;
- getnode.nd_chan_count = nd->nd_chan_count;
- getnode.nd_tx_byte = nd->nd_tx_byte;
- getnode.nd_rx_byte = nd->nd_rx_byte;
-
- memset(&getnode.nd_ps_desc, 0, MAX_DESC_LEN);
- strlcpy(getnode.nd_ps_desc, nd->nd_ps_desc, MAX_DESC_LEN);
-
- if (copy_to_user(uarg, &getnode, sizeof(struct digi_node)))
- return -EFAULT;
- break;
-
-
- case DIGI_SETDEBUG:
- if (copy_from_user(&setdebug, uarg, sizeof(struct digi_debug)))
- return -EFAULT;
-
- nd->nd_dpa_debug = setdebug.onoff;
- nd->nd_dpa_port = setdebug.port;
- break;
-
-
- case DIGI_GETVPD:
- memset(&vpd, 0, sizeof(vpd));
- if (nd->nd_vpd_len > 0) {
- vpd.vpd_len = nd->nd_vpd_len;
- memcpy(&vpd.vpd_data, &nd->nd_vpd, nd->nd_vpd_len);
- } else {
- vpd.vpd_len = 0;
- }
-
- if (copy_to_user(uarg, &vpd, sizeof(struct digi_vpd)))
- return -EFAULT;
- break;
- }
-
- return 0;
-}
-
-/**
- * dgrp_dpa() -- send data to the device monitor queue
- * @nd: pointer to a node structure
- * @buf: buffer of data to copy to the monitoring buffer
- * @len: number of bytes to transfer to the buffer
- *
- * Called by the net device routines to send data to the device
- * monitor queue. If the device monitor buffer is too full to
- * accept the data, it waits until the buffer is ready.
- */
-static void dgrp_dpa(struct nd_struct *nd, u8 *buf, int nbuf)
-{
- int n;
- int r;
- unsigned long lock_flags;
-
- /*
- * Grab DPA lock.
- */
- spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
-
- /*
- * Loop while data remains.
- */
- while (nbuf > 0 && nd->nd_dpa_buf != NULL) {
-
- n = (nd->nd_dpa_out - nd->nd_dpa_in - 1) & DPA_MASK;
-
- /*
- * Enforce flow control on the DPA device.
- */
- if (n < (DPA_MAX - DPA_HIGH_WATER))
- nd->nd_dpa_flag |= DPA_WAIT_SPACE;
-
- /*
- * This should never happen, as the flow control above
- * should have stopped things before they got to this point.
- */
- if (n == 0) {
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
- return;
- }
-
- /*
- * Copy as much data as will fit.
- */
-
- if (n > nbuf)
- n = nbuf;
-
- r = DPA_MAX - nd->nd_dpa_in;
-
- if (r <= n) {
- memcpy(nd->nd_dpa_buf + nd->nd_dpa_in, buf, r);
-
- n -= r;
-
- nd->nd_dpa_in = 0;
-
- buf += r;
- nbuf -= r;
- }
-
- memcpy(nd->nd_dpa_buf + nd->nd_dpa_in, buf, n);
-
- nd->nd_dpa_in += n;
-
- buf += n;
- nbuf -= n;
-
- if (nd->nd_dpa_in >= DPA_MAX)
- pr_info_ratelimited("%s - nd->nd_dpa_in (%i) >= DPA_MAX\n",
- __func__, nd->nd_dpa_in);
-
- /*
- * Wakeup any thread waiting for data
- */
- if (nd->nd_dpa_flag & DPA_WAIT_DATA) {
- nd->nd_dpa_flag &= ~DPA_WAIT_DATA;
- wake_up_interruptible(&nd->nd_dpa_wqueue);
- }
- }
-
- /*
- * Release the DPA lock.
- */
- spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
-}
-
-/**
- * dgrp_monitor_data() -- builds a DPA data packet
- * @nd: pointer to a node structure
- * @type: type of message to be logged in the DPA buffer
- * @buf: buffer of data to be logged in the DPA buffer
- * @size -- number of bytes in the "buf" buffer
- */
-void dgrp_dpa_data(struct nd_struct *nd, int type, u8 *buf, int size)
-{
- u8 header[5];
-
- header[0] = type;
-
- put_unaligned_be32(size, header + 1);
-
- dgrp_dpa(nd, header, sizeof(header));
- dgrp_dpa(nd, buf, size);
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.