| /* |
| * Copyright 2003 Digi International (www.digi.com) |
| * Scott H Kilau <Scott_Kilau 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. |
| */ |
| |
| /************************************************************************ |
| * |
| * This file implements the tty driver functionality for the |
| * Neo and ClassicBoard PCI based product lines. |
| * |
| ************************************************************************ |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> /* For jiffies, task states */ |
| #include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */ |
| #include <linux/module.h> |
| #include <linux/ctype.h> |
| #include <linux/tty.h> |
| #include <linux/tty_flip.h> |
| #include <linux/types.h> |
| #include <linux/serial_reg.h> |
| #include <linux/slab.h> |
| #include <linux/delay.h> /* For udelay */ |
| #include <linux/uaccess.h> /* For copy_from_user/copy_to_user */ |
| #include <linux/pci.h> |
| #include "dgnc_driver.h" |
| #include "dgnc_tty.h" |
| #include "dgnc_neo.h" |
| #include "dgnc_cls.h" |
| #include "dgnc_sysfs.h" |
| #include "dgnc_utils.h" |
| |
| /* |
| * internal variables |
| */ |
| static struct dgnc_board *dgnc_BoardsByMajor[256]; |
| static unsigned char *dgnc_TmpWriteBuf; |
| |
| /* |
| * Default transparent print information. |
| */ |
| static struct digi_t dgnc_digi_init = { |
| .digi_flags = DIGI_COOK, /* Flags */ |
| .digi_maxcps = 100, /* Max CPS */ |
| .digi_maxchar = 50, /* Max chars in print queue */ |
| .digi_bufsize = 100, /* Printer buffer size */ |
| .digi_onlen = 4, /* size of printer on string */ |
| .digi_offlen = 4, /* size of printer off string */ |
| .digi_onstr = "\033[5i", /* ANSI printer on string ] */ |
| .digi_offstr = "\033[4i", /* ANSI printer off string ] */ |
| .digi_term = "ansi" /* default terminal type */ |
| }; |
| |
| /* |
| * Define a local default termios struct. All ports will be created |
| * with this termios initially. |
| * |
| * This defines a raw port at 9600 baud, 8 data bits, no parity, |
| * 1 stop bit. |
| */ |
| static struct ktermios DgncDefaultTermios = { |
| .c_iflag = (DEFAULT_IFLAGS), /* iflags */ |
| .c_oflag = (DEFAULT_OFLAGS), /* oflags */ |
| .c_cflag = (DEFAULT_CFLAGS), /* cflags */ |
| .c_lflag = (DEFAULT_LFLAGS), /* lflags */ |
| .c_cc = INIT_C_CC, |
| .c_line = 0, |
| }; |
| |
| /* Our function prototypes */ |
| static int dgnc_tty_open(struct tty_struct *tty, struct file *file); |
| static void dgnc_tty_close(struct tty_struct *tty, struct file *file); |
| static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, |
| struct channel_t *ch); |
| static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| unsigned long arg); |
| static int dgnc_tty_digigeta(struct tty_struct *tty, |
| struct digi_t __user *retinfo); |
| static int dgnc_tty_digiseta(struct tty_struct *tty, |
| struct digi_t __user *new_info); |
| static int dgnc_tty_write_room(struct tty_struct *tty); |
| static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c); |
| static int dgnc_tty_chars_in_buffer(struct tty_struct *tty); |
| static void dgnc_tty_start(struct tty_struct *tty); |
| static void dgnc_tty_stop(struct tty_struct *tty); |
| static void dgnc_tty_throttle(struct tty_struct *tty); |
| static void dgnc_tty_unthrottle(struct tty_struct *tty); |
| static void dgnc_tty_flush_chars(struct tty_struct *tty); |
| static void dgnc_tty_flush_buffer(struct tty_struct *tty); |
| static void dgnc_tty_hangup(struct tty_struct *tty); |
| static int dgnc_set_modem_info(struct tty_struct *tty, unsigned int command, |
| unsigned int __user *value); |
| static int dgnc_get_modem_info(struct channel_t *ch, |
| unsigned int __user *value); |
| static int dgnc_tty_tiocmget(struct tty_struct *tty); |
| static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
| unsigned int clear); |
| static int dgnc_tty_send_break(struct tty_struct *tty, int msec); |
| static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout); |
| static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, |
| int count); |
| static void dgnc_tty_set_termios(struct tty_struct *tty, |
| struct ktermios *old_termios); |
| static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
| |
| static const struct tty_operations dgnc_tty_ops = { |
| .open = dgnc_tty_open, |
| .close = dgnc_tty_close, |
| .write = dgnc_tty_write, |
| .write_room = dgnc_tty_write_room, |
| .flush_buffer = dgnc_tty_flush_buffer, |
| .chars_in_buffer = dgnc_tty_chars_in_buffer, |
| .flush_chars = dgnc_tty_flush_chars, |
| .ioctl = dgnc_tty_ioctl, |
| .set_termios = dgnc_tty_set_termios, |
| .stop = dgnc_tty_stop, |
| .start = dgnc_tty_start, |
| .throttle = dgnc_tty_throttle, |
| .unthrottle = dgnc_tty_unthrottle, |
| .hangup = dgnc_tty_hangup, |
| .put_char = dgnc_tty_put_char, |
| .tiocmget = dgnc_tty_tiocmget, |
| .tiocmset = dgnc_tty_tiocmset, |
| .break_ctl = dgnc_tty_send_break, |
| .wait_until_sent = dgnc_tty_wait_until_sent, |
| .send_xchar = dgnc_tty_send_xchar |
| }; |
| |
| /************************************************************************ |
| * |
| * TTY Initialization/Cleanup Functions |
| * |
| ************************************************************************/ |
| |
| /* |
| * dgnc_tty_preinit() |
| * |
| * Initialize any global tty related data before we download any boards. |
| */ |
| int dgnc_tty_preinit(void) |
| { |
| /* |
| * Allocate a buffer for doing the copy from user space to |
| * kernel space in dgnc_write(). We only use one buffer and |
| * control access to it with a semaphore. If we are paging, we |
| * are already in trouble so one buffer won't hurt much anyway. |
| * |
| * We are okay to sleep in the malloc, as this routine |
| * is only called during module load, (not in interrupt context), |
| * and with no locks held. |
| */ |
| dgnc_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_KERNEL); |
| |
| if (!dgnc_TmpWriteBuf) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| /* |
| * dgnc_tty_register() |
| * |
| * Init the tty subsystem for this board. |
| */ |
| int dgnc_tty_register(struct dgnc_board *brd) |
| { |
| int rc = 0; |
| |
| brd->SerialDriver.magic = TTY_DRIVER_MAGIC; |
| |
| snprintf(brd->SerialName, MAXTTYNAMELEN, "tty_dgnc_%d_", brd->boardnum); |
| |
| brd->SerialDriver.name = brd->SerialName; |
| brd->SerialDriver.name_base = 0; |
| brd->SerialDriver.major = 0; |
| brd->SerialDriver.minor_start = 0; |
| brd->SerialDriver.num = brd->maxports; |
| brd->SerialDriver.type = TTY_DRIVER_TYPE_SERIAL; |
| brd->SerialDriver.subtype = SERIAL_TYPE_NORMAL; |
| brd->SerialDriver.init_termios = DgncDefaultTermios; |
| brd->SerialDriver.driver_name = DRVSTR; |
| brd->SerialDriver.flags = (TTY_DRIVER_REAL_RAW | |
| TTY_DRIVER_DYNAMIC_DEV | |
| TTY_DRIVER_HARDWARE_BREAK); |
| |
| /* |
| * The kernel wants space to store pointers to |
| * tty_struct's and termios's. |
| */ |
| brd->SerialDriver.ttys = kcalloc(brd->maxports, |
| sizeof(*brd->SerialDriver.ttys), |
| GFP_KERNEL); |
| if (!brd->SerialDriver.ttys) |
| return -ENOMEM; |
| |
| kref_init(&brd->SerialDriver.kref); |
| brd->SerialDriver.termios = kcalloc(brd->maxports, |
| sizeof(*brd->SerialDriver.termios), |
| GFP_KERNEL); |
| if (!brd->SerialDriver.termios) |
| return -ENOMEM; |
| |
| /* |
| * Entry points for driver. Called by the kernel from |
| * tty_io.c and n_tty.c. |
| */ |
| tty_set_operations(&brd->SerialDriver, &dgnc_tty_ops); |
| |
| if (!brd->dgnc_Major_Serial_Registered) { |
| /* Register tty devices */ |
| rc = tty_register_driver(&brd->SerialDriver); |
| if (rc < 0) { |
| dev_dbg(&brd->pdev->dev, |
| "Can't register tty device (%d)\n", rc); |
| return rc; |
| } |
| brd->dgnc_Major_Serial_Registered = true; |
| } |
| |
| /* |
| * If we're doing transparent print, we have to do all of the above |
| * again, separately so we don't get the LD confused about what major |
| * we are when we get into the dgnc_tty_open() routine. |
| */ |
| brd->PrintDriver.magic = TTY_DRIVER_MAGIC; |
| snprintf(brd->PrintName, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
| |
| brd->PrintDriver.name = brd->PrintName; |
| brd->PrintDriver.name_base = 0; |
| brd->PrintDriver.major = brd->SerialDriver.major; |
| brd->PrintDriver.minor_start = 0x80; |
| brd->PrintDriver.num = brd->maxports; |
| brd->PrintDriver.type = TTY_DRIVER_TYPE_SERIAL; |
| brd->PrintDriver.subtype = SERIAL_TYPE_NORMAL; |
| brd->PrintDriver.init_termios = DgncDefaultTermios; |
| brd->PrintDriver.driver_name = DRVSTR; |
| brd->PrintDriver.flags = (TTY_DRIVER_REAL_RAW | |
| TTY_DRIVER_DYNAMIC_DEV | |
| TTY_DRIVER_HARDWARE_BREAK); |
| |
| /* |
| * The kernel wants space to store pointers to |
| * tty_struct's and termios's. Must be separated from |
| * the Serial Driver so we don't get confused |
| */ |
| brd->PrintDriver.ttys = kcalloc(brd->maxports, |
| sizeof(*brd->PrintDriver.ttys), |
| GFP_KERNEL); |
| if (!brd->PrintDriver.ttys) |
| return -ENOMEM; |
| kref_init(&brd->PrintDriver.kref); |
| brd->PrintDriver.termios = kcalloc(brd->maxports, |
| sizeof(*brd->PrintDriver.termios), |
| GFP_KERNEL); |
| if (!brd->PrintDriver.termios) |
| return -ENOMEM; |
| |
| /* |
| * Entry points for driver. Called by the kernel from |
| * tty_io.c and n_tty.c. |
| */ |
| tty_set_operations(&brd->PrintDriver, &dgnc_tty_ops); |
| |
| if (!brd->dgnc_Major_TransparentPrint_Registered) { |
| /* Register Transparent Print devices */ |
| rc = tty_register_driver(&brd->PrintDriver); |
| if (rc < 0) { |
| dev_dbg(&brd->pdev->dev, |
| "Can't register Transparent Print device(%d)\n", |
| rc); |
| return rc; |
| } |
| brd->dgnc_Major_TransparentPrint_Registered = true; |
| } |
| |
| dgnc_BoardsByMajor[brd->SerialDriver.major] = brd; |
| brd->dgnc_Serial_Major = brd->SerialDriver.major; |
| brd->dgnc_TransparentPrint_Major = brd->PrintDriver.major; |
| |
| return rc; |
| } |
| |
| /* |
| * dgnc_tty_init() |
| * |
| * Init the tty subsystem. Called once per board after board has been |
| * downloaded and init'ed. |
| */ |
| int dgnc_tty_init(struct dgnc_board *brd) |
| { |
| int i; |
| void __iomem *vaddr; |
| struct channel_t *ch; |
| |
| if (!brd) |
| return -ENXIO; |
| |
| /* |
| * Initialize board structure elements. |
| */ |
| |
| vaddr = brd->re_map_membase; |
| |
| brd->nasync = brd->maxports; |
| |
| for (i = 0; i < brd->nasync; i++) { |
| /* |
| * Okay to malloc with GFP_KERNEL, we are not at |
| * interrupt context, and there are no locks held. |
| */ |
| brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), |
| GFP_KERNEL); |
| if (!brd->channels[i]) |
| goto err_free_channels; |
| } |
| |
| ch = brd->channels[0]; |
| vaddr = brd->re_map_membase; |
| |
| /* Set up channel variables */ |
| for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { |
| spin_lock_init(&ch->ch_lock); |
| |
| /* Store all our magic numbers */ |
| ch->magic = DGNC_CHANNEL_MAGIC; |
| ch->ch_tun.magic = DGNC_UNIT_MAGIC; |
| ch->ch_tun.un_ch = ch; |
| ch->ch_tun.un_type = DGNC_SERIAL; |
| ch->ch_tun.un_dev = i; |
| |
| ch->ch_pun.magic = DGNC_UNIT_MAGIC; |
| ch->ch_pun.un_ch = ch; |
| ch->ch_pun.un_type = DGNC_PRINT; |
| ch->ch_pun.un_dev = i + 128; |
| |
| if (brd->bd_uart_offset == 0x200) |
| ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
| else |
| ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
| |
| ch->ch_bd = brd; |
| ch->ch_portnum = i; |
| ch->ch_digi = dgnc_digi_init; |
| |
| /* .25 second delay */ |
| ch->ch_close_delay = 250; |
| |
| init_waitqueue_head(&ch->ch_flags_wait); |
| init_waitqueue_head(&ch->ch_tun.un_flags_wait); |
| init_waitqueue_head(&ch->ch_pun.un_flags_wait); |
| |
| { |
| struct device *classp; |
| |
| classp = tty_register_device(&brd->SerialDriver, i, |
| &ch->ch_bd->pdev->dev); |
| ch->ch_tun.un_sysfs = classp; |
| dgnc_create_tty_sysfs(&ch->ch_tun, classp); |
| |
| classp = tty_register_device(&brd->PrintDriver, i, |
| &ch->ch_bd->pdev->dev); |
| ch->ch_pun.un_sysfs = classp; |
| dgnc_create_tty_sysfs(&ch->ch_pun, classp); |
| } |
| } |
| |
| return 0; |
| |
| err_free_channels: |
| for (i = i - 1; i >= 0; --i) { |
| kfree(brd->channels[i]); |
| brd->channels[i] = NULL; |
| } |
| return -ENOMEM; |
| } |
| |
| /* |
| * dgnc_tty_post_uninit() |
| * |
| * UnInitialize any global tty related data. |
| */ |
| void dgnc_tty_post_uninit(void) |
| { |
| kfree(dgnc_TmpWriteBuf); |
| dgnc_TmpWriteBuf = NULL; |
| } |
| |
| /* |
| * dgnc_tty_uninit() |
| * |
| * Uninitialize the TTY portion of this driver. Free all memory and |
| * resources. |
| */ |
| void dgnc_tty_uninit(struct dgnc_board *brd) |
| { |
| int i = 0; |
| |
| if (brd->dgnc_Major_Serial_Registered) { |
| dgnc_BoardsByMajor[brd->SerialDriver.major] = NULL; |
| brd->dgnc_Serial_Major = 0; |
| for (i = 0; i < brd->nasync; i++) { |
| if (brd->channels[i]) |
| dgnc_remove_tty_sysfs(brd->channels[i]-> |
| ch_tun.un_sysfs); |
| tty_unregister_device(&brd->SerialDriver, i); |
| } |
| tty_unregister_driver(&brd->SerialDriver); |
| brd->dgnc_Major_Serial_Registered = false; |
| } |
| |
| if (brd->dgnc_Major_TransparentPrint_Registered) { |
| dgnc_BoardsByMajor[brd->PrintDriver.major] = NULL; |
| brd->dgnc_TransparentPrint_Major = 0; |
| for (i = 0; i < brd->nasync; i++) { |
| if (brd->channels[i]) |
| dgnc_remove_tty_sysfs(brd->channels[i]-> |
| ch_pun.un_sysfs); |
| tty_unregister_device(&brd->PrintDriver, i); |
| } |
| tty_unregister_driver(&brd->PrintDriver); |
| brd->dgnc_Major_TransparentPrint_Registered = false; |
| } |
| |
| kfree(brd->SerialDriver.ttys); |
| brd->SerialDriver.ttys = NULL; |
| kfree(brd->SerialDriver.termios); |
| brd->SerialDriver.termios = NULL; |
| kfree(brd->PrintDriver.ttys); |
| brd->PrintDriver.ttys = NULL; |
| kfree(brd->PrintDriver.termios); |
| brd->PrintDriver.termios = NULL; |
| } |
| |
| /*======================================================================= |
| * |
| * dgnc_wmove - Write data to transmit queue. |
| * |
| * ch - Pointer to channel structure. |
| * buf - Poiter to characters to be moved. |
| * n - Number of characters to move. |
| * |
| *=======================================================================*/ |
| static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
| { |
| int remain; |
| uint head; |
| |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| head = ch->ch_w_head & WQUEUEMASK; |
| |
| /* |
| * If the write wraps over the top of the circular buffer, |
| * move the portion up to the wrap point, and reset the |
| * pointers to the bottom. |
| */ |
| remain = WQUEUESIZE - head; |
| |
| if (n >= remain) { |
| n -= remain; |
| memcpy(ch->ch_wqueue + head, buf, remain); |
| head = 0; |
| buf += remain; |
| } |
| |
| if (n > 0) { |
| /* |
| * Move rest of data. |
| */ |
| remain = n; |
| memcpy(ch->ch_wqueue + head, buf, remain); |
| head += remain; |
| } |
| |
| head &= WQUEUEMASK; |
| ch->ch_w_head = head; |
| } |
| |
| /*======================================================================= |
| * |
| * dgnc_input - Process received data. |
| * |
| * ch - Pointer to channel structure. |
| * |
| *=======================================================================*/ |
| void dgnc_input(struct channel_t *ch) |
| { |
| struct dgnc_board *bd; |
| struct tty_struct *tp; |
| struct tty_ldisc *ld = NULL; |
| uint rmask; |
| ushort head; |
| ushort tail; |
| int data_len; |
| unsigned long flags; |
| int flip_len; |
| int len = 0; |
| int n = 0; |
| int s = 0; |
| int i = 0; |
| |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| tp = ch->ch_tun.un_tty; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* |
| * Figure the number of characters in the buffer. |
| * Exit immediately if none. |
| */ |
| rmask = RQUEUEMASK; |
| head = ch->ch_r_head & rmask; |
| tail = ch->ch_r_tail & rmask; |
| data_len = (head - tail) & rmask; |
| |
| if (data_len == 0) |
| goto exit_unlock; |
| |
| /* |
| * If the device is not open, or CREAD is off, |
| * flush input data and return immediately. |
| */ |
| if (!tp || (tp->magic != TTY_MAGIC) || |
| !(ch->ch_tun.un_flags & UN_ISOPEN) || |
| !(tp->termios.c_cflag & CREAD) || |
| (ch->ch_tun.un_flags & UN_CLOSING)) { |
| ch->ch_r_head = tail; |
| |
| /* Force queue flow control to be released, if needed */ |
| dgnc_check_queue_flow_control(ch); |
| |
| goto exit_unlock; |
| } |
| |
| /* |
| * If we are throttled, simply don't read any data. |
| */ |
| if (ch->ch_flags & CH_FORCED_STOPI) |
| goto exit_unlock; |
| |
| flip_len = TTY_FLIPBUF_SIZE; |
| |
| /* Chop down the length, if needed */ |
| len = min(data_len, flip_len); |
| len = min(len, (N_TTY_BUF_SIZE - 1)); |
| |
| ld = tty_ldisc_ref(tp); |
| |
| /* |
| * If we were unable to get a reference to the ld, |
| * don't flush our buffer, and act like the ld doesn't |
| * have any space to put the data right now. |
| */ |
| if (!ld) { |
| len = 0; |
| } else { |
| /* |
| * If ld doesn't have a pointer to a receive_buf function, |
| * flush the data, then act like the ld doesn't have any |
| * space to put the data right now. |
| */ |
| if (!ld->ops->receive_buf) { |
| ch->ch_r_head = ch->ch_r_tail; |
| len = 0; |
| } |
| } |
| |
| if (len <= 0) |
| goto exit_unlock; |
| |
| /* |
| * The tty layer in the kernel has changed in 2.6.16+. |
| * |
| * The flip buffers in the tty structure are no longer exposed, |
| * and probably will be going away eventually. |
| * |
| * If we are completely raw, we don't need to go through a lot |
| * of the tty layers that exist. |
| * In this case, we take the shortest and fastest route we |
| * can to relay the data to the user. |
| * |
| * On the other hand, if we are not raw, we need to go through |
| * the new 2.6.16+ tty layer, which has its API more well defined. |
| */ |
| len = tty_buffer_request_room(tp->port, len); |
| n = len; |
| |
| /* |
| * n now contains the most amount of data we can copy, |
| * bounded either by how much the Linux tty layer can handle, |
| * or the amount of data the card actually has pending... |
| */ |
| while (n) { |
| s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
| s = min(s, n); |
| |
| if (s <= 0) |
| break; |
| |
| /* |
| * If conditions are such that ld needs to see all |
| * UART errors, we will have to walk each character |
| * and error byte and send them to the buffer one at |
| * a time. |
| */ |
| if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
| for (i = 0; i < s; i++) { |
| if (*(ch->ch_equeue + tail + i) & UART_LSR_BI) |
| tty_insert_flip_char(tp->port, |
| *(ch->ch_rqueue + tail + i), |
| TTY_BREAK); |
| else if (*(ch->ch_equeue + tail + i) & |
| UART_LSR_PE) |
| tty_insert_flip_char(tp->port, |
| *(ch->ch_rqueue + tail + i), |
| TTY_PARITY); |
| else if (*(ch->ch_equeue + tail + i) & |
| UART_LSR_FE) |
| tty_insert_flip_char(tp->port, |
| *(ch->ch_rqueue + tail + i), |
| TTY_FRAME); |
| else |
| tty_insert_flip_char(tp->port, |
| *(ch->ch_rqueue + tail + i), |
| TTY_NORMAL); |
| } |
| } else { |
| tty_insert_flip_string(tp->port, |
| ch->ch_rqueue + tail, |
| s); |
| } |
| |
| tail += s; |
| n -= s; |
| /* Flip queue if needed */ |
| tail &= rmask; |
| } |
| |
| ch->ch_r_tail = tail & rmask; |
| ch->ch_e_tail = tail & rmask; |
| dgnc_check_queue_flow_control(ch); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| /* Tell the tty layer its okay to "eat" the data now */ |
| tty_flip_buffer_push(tp->port); |
| |
| if (ld) |
| tty_ldisc_deref(ld); |
| return; |
| |
| exit_unlock: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| if (ld) |
| tty_ldisc_deref(ld); |
| } |
| |
| /************************************************************************ |
| * Determines when CARRIER changes state and takes appropriate |
| * action. |
| ************************************************************************/ |
| void dgnc_carrier(struct channel_t *ch) |
| { |
| struct dgnc_board *bd; |
| |
| int virt_carrier = 0; |
| int phys_carrier = 0; |
| |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| if (ch->ch_mistat & UART_MSR_DCD) |
| phys_carrier = 1; |
| |
| if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
| virt_carrier = 1; |
| |
| if (ch->ch_c_cflag & CLOCAL) |
| virt_carrier = 1; |
| |
| /* |
| * Test for a VIRTUAL carrier transition to HIGH. |
| */ |
| if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { |
| /* |
| * When carrier rises, wake any threads waiting |
| * for carrier in the open routine. |
| */ |
| |
| if (waitqueue_active(&ch->ch_flags_wait)) |
| wake_up_interruptible(&ch->ch_flags_wait); |
| } |
| |
| /* |
| * Test for a PHYSICAL carrier transition to HIGH. |
| */ |
| if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { |
| /* |
| * When carrier rises, wake any threads waiting |
| * for carrier in the open routine. |
| */ |
| |
| if (waitqueue_active(&ch->ch_flags_wait)) |
| wake_up_interruptible(&ch->ch_flags_wait); |
| } |
| |
| /* |
| * Test for a PHYSICAL transition to low, so long as we aren't |
| * currently ignoring physical transitions (which is what "virtual |
| * carrier" indicates). |
| * |
| * The transition of the virtual carrier to low really doesn't |
| * matter... it really only means "ignore carrier state", not |
| * "make pretend that carrier is there". |
| */ |
| if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && |
| (phys_carrier == 0)) { |
| /* |
| * When carrier drops: |
| * |
| * Drop carrier on all open units. |
| * |
| * Flush queues, waking up any task waiting in the |
| * line discipline. |
| * |
| * Send a hangup to the control terminal. |
| * |
| * Enable all select calls. |
| */ |
| if (waitqueue_active(&ch->ch_flags_wait)) |
| wake_up_interruptible(&ch->ch_flags_wait); |
| |
| if (ch->ch_tun.un_open_count > 0) |
| tty_hangup(ch->ch_tun.un_tty); |
| |
| if (ch->ch_pun.un_open_count > 0) |
| tty_hangup(ch->ch_pun.un_tty); |
| } |
| |
| /* |
| * Make sure that our cached values reflect the current reality. |
| */ |
| if (virt_carrier == 1) |
| ch->ch_flags |= CH_FCAR; |
| else |
| ch->ch_flags &= ~CH_FCAR; |
| |
| if (phys_carrier == 1) |
| ch->ch_flags |= CH_CD; |
| else |
| ch->ch_flags &= ~CH_CD; |
| } |
| |
| /* |
| * Assign the custom baud rate to the channel structure |
| */ |
| static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) |
| { |
| int testdiv; |
| int testrate_high; |
| int testrate_low; |
| int deltahigh; |
| int deltalow; |
| |
| if (newrate <= 0) { |
| ch->ch_custom_speed = 0; |
| return; |
| } |
| |
| /* |
| * Since the divisor is stored in a 16-bit integer, we make sure |
| * we don't allow any rates smaller than a 16-bit integer would allow. |
| * And of course, rates above the dividend won't fly. |
| */ |
| if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) |
| newrate = ((ch->ch_bd->bd_dividend / 0xFFFF) + 1); |
| |
| if (newrate && newrate > ch->ch_bd->bd_dividend) |
| newrate = ch->ch_bd->bd_dividend; |
| |
| if (newrate > 0) { |
| testdiv = ch->ch_bd->bd_dividend / newrate; |
| |
| /* |
| * If we try to figure out what rate the board would use |
| * with the test divisor, it will be either equal or higher |
| * than the requested baud rate. If we then determine the |
| * rate with a divisor one higher, we will get the next lower |
| * supported rate below the requested. |
| */ |
| testrate_high = ch->ch_bd->bd_dividend / testdiv; |
| testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); |
| |
| /* |
| * If the rate for the requested divisor is correct, just |
| * use it and be done. |
| */ |
| if (testrate_high != newrate) { |
| /* |
| * Otherwise, pick the rate that is closer |
| * (i.e. whichever rate has a smaller delta). |
| */ |
| deltahigh = testrate_high - newrate; |
| deltalow = newrate - testrate_low; |
| |
| if (deltahigh < deltalow) |
| newrate = testrate_high; |
| else |
| newrate = testrate_low; |
| } |
| } |
| |
| ch->ch_custom_speed = newrate; |
| } |
| |
| void dgnc_check_queue_flow_control(struct channel_t *ch) |
| { |
| int qleft; |
| |
| /* Store how much space we have left in the queue */ |
| qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
| if (qleft < 0) |
| qleft += RQUEUEMASK + 1; |
| |
| /* |
| * Check to see if we should enforce flow control on our queue because |
| * the ld (or user) isn't reading data out of our queue fast enuf. |
| * |
| * NOTE: This is done based on what the current flow control of the |
| * port is set for. |
| * |
| * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. |
| * This will cause the UART's FIFO to back up, and force |
| * the RTS signal to be dropped. |
| * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to |
| * the other side, in hopes it will stop sending data to us. |
| * 3) NONE - Nothing we can do. We will simply drop any extra data |
| * that gets sent into us when the queue fills up. |
| */ |
| if (qleft < 256) { |
| /* HWFLOW */ |
| if (ch->ch_digi.digi_flags & CTSPACE || |
| ch->ch_c_cflag & CRTSCTS) { |
| if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
| ch->ch_bd->bd_ops->disable_receiver(ch); |
| ch->ch_flags |= (CH_RECEIVER_OFF); |
| } |
| } |
| /* SWFLOW */ |
| else if (ch->ch_c_iflag & IXOFF) { |
| if (ch->ch_stops_sent <= MAX_STOPS_SENT) { |
| ch->ch_bd->bd_ops->send_stop_character(ch); |
| ch->ch_stops_sent++; |
| } |
| } |
| } |
| |
| /* |
| * Check to see if we should unenforce flow control because |
| * ld (or user) finally read enuf data out of our queue. |
| * |
| * NOTE: This is done based on what the current flow control of the |
| * port is set for. |
| * |
| * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. |
| * This will cause the UART's FIFO to raise RTS back up, |
| * which will allow the other side to start sending data again. |
| * 2) SWFLOW (IXOFF) - Send a start character to |
| * the other side, so it will start sending data to us again. |
| * 3) NONE - Do nothing. Since we didn't do anything to turn off the |
| * other side, we don't need to do anything now. |
| */ |
| if (qleft > (RQUEUESIZE / 2)) { |
| /* HWFLOW */ |
| if (ch->ch_digi.digi_flags & RTSPACE || |
| ch->ch_c_cflag & CRTSCTS) { |
| if (ch->ch_flags & CH_RECEIVER_OFF) { |
| ch->ch_bd->bd_ops->enable_receiver(ch); |
| ch->ch_flags &= ~(CH_RECEIVER_OFF); |
| } |
| } |
| /* SWFLOW */ |
| else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { |
| ch->ch_stops_sent = 0; |
| ch->ch_bd->bd_ops->send_start_character(ch); |
| } |
| } |
| } |
| |
| void dgnc_wakeup_writes(struct channel_t *ch) |
| { |
| int qlen = 0; |
| unsigned long flags; |
| |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* |
| * If channel now has space, wake up anyone waiting on the condition. |
| */ |
| qlen = ch->ch_w_head - ch->ch_w_tail; |
| if (qlen < 0) |
| qlen += WQUEUESIZE; |
| |
| if (qlen >= (WQUEUESIZE - 256)) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return; |
| } |
| |
| if (ch->ch_tun.un_flags & UN_ISOPEN) { |
| if ((ch->ch_tun.un_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
| ch->ch_tun.un_tty->ldisc->ops->write_wakeup) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| ch->ch_tun.un_tty->ldisc->ops->write_wakeup(ch->ch_tun.un_tty); |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| } |
| |
| wake_up_interruptible(&ch->ch_tun.un_tty->write_wait); |
| |
| /* |
| * If unit is set to wait until empty, check to make sure |
| * the queue AND FIFO are both empty. |
| */ |
| if (ch->ch_tun.un_flags & UN_EMPTY) { |
| if ((qlen == 0) && |
| (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
| ch->ch_tun.un_flags &= ~(UN_EMPTY); |
| |
| /* |
| * If RTS Toggle mode is on, whenever |
| * the queue and UART is empty, keep RTS low. |
| */ |
| if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { |
| ch->ch_mostat &= ~(UART_MCR_RTS); |
| ch->ch_bd->bd_ops->assert_modem_signals(ch); |
| } |
| |
| /* |
| * If DTR Toggle mode is on, whenever |
| * the queue and UART is empty, keep DTR low. |
| */ |
| if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { |
| ch->ch_mostat &= ~(UART_MCR_DTR); |
| ch->ch_bd->bd_ops->assert_modem_signals(ch); |
| } |
| } |
| } |
| |
| wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
| } |
| |
| if (ch->ch_pun.un_flags & UN_ISOPEN) { |
| if ((ch->ch_pun.un_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
| ch->ch_pun.un_tty->ldisc->ops->write_wakeup) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| ch->ch_pun.un_tty->ldisc->ops->write_wakeup(ch->ch_pun.un_tty); |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| } |
| |
| wake_up_interruptible(&ch->ch_pun.un_tty->write_wait); |
| |
| /* |
| * If unit is set to wait until empty, check to make sure |
| * the queue AND FIFO are both empty. |
| */ |
| if (ch->ch_pun.un_flags & UN_EMPTY) { |
| if ((qlen == 0) && |
| (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) |
| ch->ch_pun.un_flags &= ~(UN_EMPTY); |
| } |
| |
| wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
| } |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| /************************************************************************ |
| * |
| * TTY Entry points and helper functions |
| * |
| ************************************************************************/ |
| |
| /* |
| * dgnc_tty_open() |
| * |
| */ |
| static int dgnc_tty_open(struct tty_struct *tty, struct file *file) |
| { |
| struct dgnc_board *brd; |
| struct channel_t *ch; |
| struct un_t *un; |
| uint major = 0; |
| uint minor = 0; |
| int rc = 0; |
| unsigned long flags; |
| |
| rc = 0; |
| |
| major = MAJOR(tty_devnum(tty)); |
| minor = MINOR(tty_devnum(tty)); |
| |
| if (major > 255) |
| return -ENXIO; |
| |
| /* Get board pointer from our array of majors we have allocated */ |
| brd = dgnc_BoardsByMajor[major]; |
| if (!brd) |
| return -ENXIO; |
| |
| /* |
| * If board is not yet up to a state of READY, go to |
| * sleep waiting for it to happen or they cancel the open. |
| */ |
| rc = wait_event_interruptible(brd->state_wait, |
| (brd->state & BOARD_READY)); |
| |
| if (rc) |
| return rc; |
| |
| spin_lock_irqsave(&brd->bd_lock, flags); |
| |
| /* If opened device is greater than our number of ports, bail. */ |
| if (PORT_NUM(minor) >= brd->nasync) { |
| spin_unlock_irqrestore(&brd->bd_lock, flags); |
| return -ENXIO; |
| } |
| |
| ch = brd->channels[PORT_NUM(minor)]; |
| if (!ch) { |
| spin_unlock_irqrestore(&brd->bd_lock, flags); |
| return -ENXIO; |
| } |
| |
| /* Drop board lock */ |
| spin_unlock_irqrestore(&brd->bd_lock, flags); |
| |
| /* Grab channel lock */ |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* Figure out our type */ |
| if (!IS_PRINT(minor)) { |
| un = &brd->channels[PORT_NUM(minor)]->ch_tun; |
| un->un_type = DGNC_SERIAL; |
| } else if (IS_PRINT(minor)) { |
| un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
| un->un_type = DGNC_PRINT; |
| } else { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return -ENXIO; |
| } |
| |
| /* |
| * If the port is still in a previous open, and in a state |
| * where we simply cannot safely keep going, wait until the |
| * state clears. |
| */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| rc = wait_event_interruptible(ch->ch_flags_wait, |
| ((ch->ch_flags & CH_OPENING) == 0)); |
| |
| /* If ret is non-zero, user ctrl-c'ed us */ |
| if (rc) |
| return -EINTR; |
| |
| /* |
| * If either unit is in the middle of the fragile part of close, |
| * we just cannot touch the channel safely. |
| * Go to sleep, knowing that when the channel can be |
| * touched safely, the close routine will signal the |
| * ch_flags_wait to wake us back up. |
| */ |
| rc = wait_event_interruptible(ch->ch_flags_wait, |
| (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
| UN_CLOSING) == 0)); |
| |
| /* If ret is non-zero, user ctrl-c'ed us */ |
| if (rc) |
| return -EINTR; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* Store our unit into driver_data, so we always have it available. */ |
| tty->driver_data = un; |
| |
| /* |
| * Initialize tty's |
| */ |
| if (!(un->un_flags & UN_ISOPEN)) { |
| /* Store important variables. */ |
| un->un_tty = tty; |
| |
| /* Maybe do something here to the TTY struct as well? */ |
| } |
| |
| /* |
| * Allocate channel buffers for read/write/error. |
| * Set flag, so we don't get trounced on. |
| */ |
| ch->ch_flags |= (CH_OPENING); |
| |
| /* Drop locks, as malloc with GFP_KERNEL can sleep */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| if (!ch->ch_rqueue) |
| ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
| if (!ch->ch_equeue) |
| ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
| if (!ch->ch_wqueue) |
| ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_flags &= ~(CH_OPENING); |
| wake_up_interruptible(&ch->ch_flags_wait); |
| |
| /* |
| * Initialize if neither terminal or printer is open. |
| */ |
| if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { |
| /* |
| * Flush input queues. |
| */ |
| ch->ch_r_head = 0; |
| ch->ch_r_tail = 0; |
| ch->ch_e_head = 0; |
| ch->ch_e_tail = 0; |
| ch->ch_w_head = 0; |
| ch->ch_w_tail = 0; |
| |
| brd->bd_ops->flush_uart_write(ch); |
| brd->bd_ops->flush_uart_read(ch); |
| |
| ch->ch_flags = 0; |
| ch->ch_cached_lsr = 0; |
| ch->ch_stop_sending_break = 0; |
| ch->ch_stops_sent = 0; |
| |
| ch->ch_c_cflag = tty->termios.c_cflag; |
| ch->ch_c_iflag = tty->termios.c_iflag; |
| ch->ch_c_oflag = tty->termios.c_oflag; |
| ch->ch_c_lflag = tty->termios.c_lflag; |
| ch->ch_startc = tty->termios.c_cc[VSTART]; |
| ch->ch_stopc = tty->termios.c_cc[VSTOP]; |
| |
| /* |
| * Bring up RTS and DTR... |
| * Also handle RTS or DTR toggle if set. |
| */ |
| if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) |
| ch->ch_mostat |= (UART_MCR_RTS); |
| if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) |
| ch->ch_mostat |= (UART_MCR_DTR); |
| |
| /* Tell UART to init itself */ |
| brd->bd_ops->uart_init(ch); |
| } |
| |
| /* |
| * Run param in case we changed anything |
| */ |
| brd->bd_ops->param(tty); |
| |
| dgnc_carrier(ch); |
| |
| /* |
| * follow protocol for opening port |
| */ |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| rc = dgnc_block_til_ready(tty, file, ch); |
| |
| /* No going back now, increment our unit and channel counters */ |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| ch->ch_open_count++; |
| un->un_open_count++; |
| un->un_flags |= (UN_ISOPEN); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return rc; |
| } |
| |
| /* |
| * dgnc_block_til_ready() |
| * |
| * Wait for DCD, if needed. |
| */ |
| static int dgnc_block_til_ready(struct tty_struct *tty, |
| struct file *file, |
| struct channel_t *ch) |
| { |
| int retval = 0; |
| struct un_t *un = NULL; |
| unsigned long flags; |
| uint old_flags = 0; |
| int sleep_on_un_flags = 0; |
| |
| if (!tty || tty->magic != TTY_MAGIC || !file || !ch || |
| ch->magic != DGNC_CHANNEL_MAGIC) |
| return -ENXIO; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return -ENXIO; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_wopen++; |
| |
| /* Loop forever */ |
| while (1) { |
| sleep_on_un_flags = 0; |
| |
| /* |
| * If board has failed somehow during our sleep, |
| * bail with error. |
| */ |
| if (ch->ch_bd->state == BOARD_FAILED) { |
| retval = -ENXIO; |
| break; |
| } |
| |
| /* If tty was hung up, break out of loop and set error. */ |
| if (tty_hung_up_p(file)) { |
| retval = -EAGAIN; |
| break; |
| } |
| |
| /* |
| * If either unit is in the middle of the fragile part of close, |
| * we just cannot touch the channel safely. |
| * Go back to sleep, knowing that when the channel can be |
| * touched safely, the close routine will signal the |
| * ch_wait_flags to wake us back up. |
| */ |
| if (!((ch->ch_tun.un_flags | |
| ch->ch_pun.un_flags) & |
| UN_CLOSING)) { |
| /* |
| * Our conditions to leave cleanly and happily: |
| * 1) NONBLOCKING on the tty is set. |
| * 2) CLOCAL is set. |
| * 3) DCD (fake or real) is active. |
| */ |
| |
| if (file->f_flags & O_NONBLOCK) |
| break; |
| |
| if (tty->flags & (1 << TTY_IO_ERROR)) { |
| retval = -EIO; |
| break; |
| } |
| |
| if (ch->ch_flags & CH_CD) |
| break; |
| |
| if (ch->ch_flags & CH_FCAR) |
| break; |
| } else { |
| sleep_on_un_flags = 1; |
| } |
| |
| /* |
| * If there is a signal pending, the user probably |
| * interrupted (ctrl-c) us. |
| * Leave loop with error set. |
| */ |
| if (signal_pending(current)) { |
| retval = -ERESTARTSYS; |
| break; |
| } |
| |
| /* |
| * Store the flags before we let go of channel lock |
| */ |
| if (sleep_on_un_flags) |
| old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; |
| else |
| old_flags = ch->ch_flags; |
| |
| /* |
| * Let go of channel lock before calling schedule. |
| * Our poller will get any FEP events and wake us up when DCD |
| * eventually goes active. |
| */ |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| /* |
| * Wait for something in the flags to change |
| * from the current value. |
| */ |
| if (sleep_on_un_flags) |
| retval = wait_event_interruptible(un->un_flags_wait, |
| (old_flags != (ch->ch_tun.un_flags | |
| ch->ch_pun.un_flags))); |
| else |
| retval = wait_event_interruptible(ch->ch_flags_wait, |
| (old_flags != ch->ch_flags)); |
| |
| /* |
| * We got woken up for some reason. |
| * Before looping around, grab our channel lock. |
| */ |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| } |
| |
| ch->ch_wopen--; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return retval; |
| } |
| |
| /* |
| * dgnc_tty_hangup() |
| * |
| * Hangup the port. Like a close, but don't wait for output to drain. |
| */ |
| static void dgnc_tty_hangup(struct tty_struct *tty) |
| { |
| struct un_t *un; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| /* flush the transmit queues */ |
| dgnc_tty_flush_buffer(tty); |
| } |
| |
| /* |
| * dgnc_tty_close() |
| * |
| */ |
| static void dgnc_tty_close(struct tty_struct *tty, struct file *file) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* |
| * Determine if this is the last close or not - and if we agree about |
| * which type of close it is with the Line Discipline |
| */ |
| if ((tty->count == 1) && (un->un_open_count != 1)) { |
| /* |
| * Uh, oh. tty->count is 1, which means that the tty |
| * structure will be freed. un_open_count should always |
| * be one in these conditions. If it's greater than |
| * one, we've got real problems, since it means the |
| * serial port won't be shutdown. |
| */ |
| dev_dbg(tty->dev, |
| "tty->count is 1, un open count is %d\n", |
| un->un_open_count); |
| un->un_open_count = 1; |
| } |
| |
| if (un->un_open_count) |
| un->un_open_count--; |
| else |
| dev_dbg(tty->dev, |
| "bad serial port open count of %d\n", |
| un->un_open_count); |
| |
| ch->ch_open_count--; |
| |
| if (ch->ch_open_count && un->un_open_count) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return; |
| } |
| |
| /* OK, its the last close on the unit */ |
| un->un_flags |= UN_CLOSING; |
| |
| tty->closing = 1; |
| |
| /* |
| * Only officially close channel if count is 0 and |
| * DIGI_PRINTER bit is not set. |
| */ |
| if ((ch->ch_open_count == 0) && |
| !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { |
| ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
| |
| /* |
| * turn off print device when closing print device. |
| */ |
| if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
| dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
| (int)ch->ch_digi.digi_offlen); |
| ch->ch_flags &= ~CH_PRON; |
| } |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| /* wait for output to drain */ |
| /* This will also return if we take an interrupt */ |
| |
| bd->bd_ops->drain(tty, 0); |
| |
| dgnc_tty_flush_buffer(tty); |
| tty_ldisc_flush(tty); |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| tty->closing = 0; |
| |
| /* |
| * If we have HUPCL set, lower DTR and RTS |
| */ |
| if (ch->ch_c_cflag & HUPCL) { |
| /* Drop RTS/DTR */ |
| ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); |
| bd->bd_ops->assert_modem_signals(ch); |
| |
| /* |
| * Go to sleep to ensure RTS/DTR |
| * have been dropped for modems to see it. |
| */ |
| if (ch->ch_close_delay) { |
| spin_unlock_irqrestore(&ch->ch_lock, |
| flags); |
| dgnc_ms_sleep(ch->ch_close_delay); |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| } |
| } |
| |
| ch->ch_old_baud = 0; |
| |
| /* Turn off UART interrupts for this port */ |
| ch->ch_bd->bd_ops->uart_off(ch); |
| } else { |
| /* |
| * turn off print device when closing print device. |
| */ |
| if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
| dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
| (int)ch->ch_digi.digi_offlen); |
| ch->ch_flags &= ~CH_PRON; |
| } |
| } |
| |
| un->un_tty = NULL; |
| un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); |
| |
| wake_up_interruptible(&ch->ch_flags_wait); |
| wake_up_interruptible(&un->un_flags_wait); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| /* |
| * dgnc_tty_chars_in_buffer() |
| * |
| * Return number of characters that have not been transmitted yet. |
| * |
| * This routine is used by the line discipline to determine if there |
| * is data waiting to be transmitted/drained/flushed or not. |
| */ |
| static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) |
| { |
| struct channel_t *ch = NULL; |
| struct un_t *un = NULL; |
| ushort thead; |
| ushort ttail; |
| uint tmask; |
| uint chars = 0; |
| unsigned long flags; |
| |
| if (!tty) |
| return 0; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return 0; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return 0; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| tmask = WQUEUEMASK; |
| thead = ch->ch_w_head & tmask; |
| ttail = ch->ch_w_tail & tmask; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| if (ttail == thead) { |
| chars = 0; |
| } else { |
| if (thead >= ttail) |
| chars = thead - ttail; |
| else |
| chars = thead - ttail + WQUEUESIZE; |
| } |
| |
| return chars; |
| } |
| |
| /* |
| * dgnc_maxcps_room |
| * |
| * Reduces bytes_available to the max number of characters |
| * that can be sent currently given the maxcps value, and |
| * returns the new bytes_available. This only affects printer |
| * output. |
| */ |
| static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available) |
| { |
| struct channel_t *ch = NULL; |
| struct un_t *un = NULL; |
| |
| if (!tty) |
| return bytes_available; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return bytes_available; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return bytes_available; |
| |
| /* |
| * If its not the Transparent print device, return |
| * the full data amount. |
| */ |
| if (un->un_type != DGNC_PRINT) |
| return bytes_available; |
| |
| if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
| int cps_limit = 0; |
| unsigned long current_time = jiffies; |
| unsigned long buffer_time = current_time + |
| (HZ * ch->ch_digi.digi_bufsize) / |
| ch->ch_digi.digi_maxcps; |
| |
| if (ch->ch_cpstime < current_time) { |
| /* buffer is empty */ |
| ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
| cps_limit = ch->ch_digi.digi_bufsize; |
| } else if (ch->ch_cpstime < buffer_time) { |
| /* still room in the buffer */ |
| cps_limit = ((buffer_time - ch->ch_cpstime) * |
| ch->ch_digi.digi_maxcps) / HZ; |
| } else { |
| /* no room in the buffer */ |
| cps_limit = 0; |
| } |
| |
| bytes_available = min(cps_limit, bytes_available); |
| } |
| |
| return bytes_available; |
| } |
| |
| /* |
| * dgnc_tty_write_room() |
| * |
| * Return space available in Tx buffer |
| */ |
| static int dgnc_tty_write_room(struct tty_struct *tty) |
| { |
| struct channel_t *ch = NULL; |
| struct un_t *un = NULL; |
| ushort head; |
| ushort tail; |
| ushort tmask; |
| int ret = 0; |
| unsigned long flags; |
| |
| if (!tty || !dgnc_TmpWriteBuf) |
| return 0; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return 0; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return 0; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| tmask = WQUEUEMASK; |
| head = (ch->ch_w_head) & tmask; |
| tail = (ch->ch_w_tail) & tmask; |
| |
| ret = tail - head - 1; |
| if (ret < 0) |
| ret += WQUEUESIZE; |
| |
| /* Limit printer to maxcps */ |
| ret = dgnc_maxcps_room(tty, ret); |
| |
| /* |
| * If we are printer device, leave space for |
| * possibly both the on and off strings. |
| */ |
| if (un->un_type == DGNC_PRINT) { |
| if (!(ch->ch_flags & CH_PRON)) |
| ret -= ch->ch_digi.digi_onlen; |
| ret -= ch->ch_digi.digi_offlen; |
| } else { |
| if (ch->ch_flags & CH_PRON) |
| ret -= ch->ch_digi.digi_offlen; |
| } |
| |
| if (ret < 0) |
| ret = 0; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return ret; |
| } |
| |
| /* |
| * dgnc_tty_put_char() |
| * |
| * Put a character into ch->ch_buf |
| * |
| * - used by the line discipline for OPOST processing |
| */ |
| static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) |
| { |
| /* |
| * Simply call tty_write. |
| */ |
| dgnc_tty_write(tty, &c, 1); |
| return 1; |
| } |
| |
| /* |
| * dgnc_tty_write() |
| * |
| * Take data from the user or kernel and send it out to the FEP. |
| * In here exists all the Transparent Print magic as well. |
| */ |
| static int dgnc_tty_write(struct tty_struct *tty, |
| const unsigned char *buf, int count) |
| { |
| struct channel_t *ch = NULL; |
| struct un_t *un = NULL; |
| int bufcount = 0, n = 0; |
| unsigned long flags; |
| ushort head; |
| ushort tail; |
| ushort tmask; |
| uint remain; |
| |
| if (!tty || !dgnc_TmpWriteBuf) |
| return 0; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return 0; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return 0; |
| |
| if (!count) |
| return 0; |
| |
| /* |
| * Store original amount of characters passed in. |
| * This helps to figure out if we should ask the FEP |
| * to send us an event when it has more space available. |
| */ |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* Get our space available for the channel from the board */ |
| tmask = WQUEUEMASK; |
| head = (ch->ch_w_head) & tmask; |
| tail = (ch->ch_w_tail) & tmask; |
| |
| bufcount = tail - head - 1; |
| if (bufcount < 0) |
| bufcount += WQUEUESIZE; |
| |
| /* |
| * Limit printer output to maxcps overall, with bursts allowed |
| * up to bufsize characters. |
| */ |
| bufcount = dgnc_maxcps_room(tty, bufcount); |
| |
| /* |
| * Take minimum of what the user wants to send, and the |
| * space available in the FEP buffer. |
| */ |
| count = min(count, bufcount); |
| |
| /* |
| * Bail if no space left. |
| */ |
| if (count <= 0) |
| goto exit_retry; |
| |
| /* |
| * Output the printer ON string, if we are in terminal mode, but |
| * need to be in printer mode. |
| */ |
| if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { |
| dgnc_wmove(ch, ch->ch_digi.digi_onstr, |
| (int)ch->ch_digi.digi_onlen); |
| head = (ch->ch_w_head) & tmask; |
| ch->ch_flags |= CH_PRON; |
| } |
| |
| /* |
| * On the other hand, output the printer OFF string, if we are |
| * currently in printer mode, but need to output to the terminal. |
| */ |
| if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
| dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
| (int)ch->ch_digi.digi_offlen); |
| head = (ch->ch_w_head) & tmask; |
| ch->ch_flags &= ~CH_PRON; |
| } |
| |
| n = count; |
| |
| /* |
| * If the write wraps over the top of the circular buffer, |
| * move the portion up to the wrap point, and reset the |
| * pointers to the bottom. |
| */ |
| remain = WQUEUESIZE - head; |
| |
| if (n >= remain) { |
| n -= remain; |
| memcpy(ch->ch_wqueue + head, buf, remain); |
| head = 0; |
| buf += remain; |
| } |
| |
| if (n > 0) { |
| /* |
| * Move rest of data. |
| */ |
| remain = n; |
| memcpy(ch->ch_wqueue + head, buf, remain); |
| head += remain; |
| } |
| |
| if (count) { |
| head &= tmask; |
| ch->ch_w_head = head; |
| } |
| |
| /* Update printer buffer empty time. */ |
| if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) |
| && (ch->ch_digi.digi_bufsize > 0)) { |
| ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
| } |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| if (count) { |
| /* |
| * Channel lock is grabbed and then released |
| * inside this routine. |
| */ |
| ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); |
| } |
| |
| return count; |
| |
| exit_retry: |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return 0; |
| } |
| |
| /* |
| * Return modem signals to ld. |
| */ |
| |
| static int dgnc_tty_tiocmget(struct tty_struct *tty) |
| { |
| struct channel_t *ch; |
| struct un_t *un; |
| int result = -EIO; |
| unsigned char mstat = 0; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return result; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return result; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return result; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| mstat = (ch->ch_mostat | ch->ch_mistat); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| result = 0; |
| |
| if (mstat & UART_MCR_DTR) |
| result |= TIOCM_DTR; |
| if (mstat & UART_MCR_RTS) |
| result |= TIOCM_RTS; |
| if (mstat & UART_MSR_CTS) |
| result |= TIOCM_CTS; |
| if (mstat & UART_MSR_DSR) |
| result |= TIOCM_DSR; |
| if (mstat & UART_MSR_RI) |
| result |= TIOCM_RI; |
| if (mstat & UART_MSR_DCD) |
| result |= TIOCM_CD; |
| |
| return result; |
| } |
| |
| /* |
| * dgnc_tty_tiocmset() |
| * |
| * Set modem signals, called by ld. |
| */ |
| |
| static int dgnc_tty_tiocmset(struct tty_struct *tty, |
| unsigned int set, unsigned int clear) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| int ret = -EIO; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return ret; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return ret; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return ret; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return ret; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| if (set & TIOCM_RTS) |
| ch->ch_mostat |= UART_MCR_RTS; |
| |
| if (set & TIOCM_DTR) |
| ch->ch_mostat |= UART_MCR_DTR; |
| |
| if (clear & TIOCM_RTS) |
| ch->ch_mostat &= ~(UART_MCR_RTS); |
| |
| if (clear & TIOCM_DTR) |
| ch->ch_mostat &= ~(UART_MCR_DTR); |
| |
| ch->ch_bd->bd_ops->assert_modem_signals(ch); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * dgnc_tty_send_break() |
| * |
| * Send a Break, called by ld. |
| */ |
| static int dgnc_tty_send_break(struct tty_struct *tty, int msec) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| int ret = -EIO; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return ret; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return ret; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return ret; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return ret; |
| |
| switch (msec) { |
| case -1: |
| msec = 0xFFFF; |
| break; |
| case 0: |
| msec = 0; |
| break; |
| default: |
| break; |
| } |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_bd->bd_ops->send_break(ch, msec); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * dgnc_tty_wait_until_sent() |
| * |
| * wait until data has been transmitted, called by ld. |
| */ |
| static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| bd->bd_ops->drain(tty, 0); |
| } |
| |
| /* |
| * dgnc_send_xchar() |
| * |
| * send a high priority character, called by ld. |
| */ |
| static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| bd->bd_ops->send_immediate_char(ch, c); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
| } |
| |
| /* |
| * Return modem signals to ld. |
| */ |
| static inline int dgnc_get_mstat(struct channel_t *ch) |
| { |
| unsigned char mstat; |
| int result = -EIO; |
| unsigned long flags; |
| |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return -ENXIO; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| mstat = (ch->ch_mostat | ch->ch_mistat); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| result = 0; |
| |
| if (mstat & UART_MCR_DTR) |
| result |= TIOCM_DTR; |
| if (mstat & UART_MCR_RTS) |
| result |= TIOCM_RTS; |
| if (mstat & UART_MSR_CTS) |
| result |= TIOCM_CTS; |
| if (mstat & UART_MSR_DSR) |
| result |= TIOCM_DSR; |
| if (mstat & UART_MSR_RI) |
| result |= TIOCM_RI; |
| if (mstat & UART_MSR_DCD) |
| result |= TIOCM_CD; |
| |
| return result; |
| } |
| |
| /* |
| * Return modem signals to ld. |
| */ |
| static int dgnc_get_modem_info(struct channel_t *ch, |
| unsigned int __user *value) |
| { |
| int result; |
| |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return -ENXIO; |
| |
| result = dgnc_get_mstat(ch); |
| |
| if (result < 0) |
| return -ENXIO; |
| |
| return put_user(result, value); |
| } |
| |
| /* |
| * dgnc_set_modem_info() |
| * |
| * Set modem signals, called by ld. |
| */ |
| static int dgnc_set_modem_info(struct tty_struct *tty, |
| unsigned int command, |
| unsigned int __user *value) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| int ret = -ENXIO; |
| unsigned int arg = 0; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return ret; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return ret; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return ret; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return ret; |
| |
| ret = get_user(arg, value); |
| if (ret) |
| return ret; |
| |
| switch (command) { |
| case TIOCMBIS: |
| if (arg & TIOCM_RTS) |
| ch->ch_mostat |= UART_MCR_RTS; |
| |
| if (arg & TIOCM_DTR) |
| ch->ch_mostat |= UART_MCR_DTR; |
| |
| break; |
| |
| case TIOCMBIC: |
| if (arg & TIOCM_RTS) |
| ch->ch_mostat &= ~(UART_MCR_RTS); |
| |
| if (arg & TIOCM_DTR) |
| ch->ch_mostat &= ~(UART_MCR_DTR); |
| |
| break; |
| |
| case TIOCMSET: |
| |
| if (arg & TIOCM_RTS) |
| ch->ch_mostat |= UART_MCR_RTS; |
| else |
| ch->ch_mostat &= ~(UART_MCR_RTS); |
| |
| if (arg & TIOCM_DTR) |
| ch->ch_mostat |= UART_MCR_DTR; |
| else |
| ch->ch_mostat &= ~(UART_MCR_DTR); |
| |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_bd->bd_ops->assert_modem_signals(ch); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * dgnc_tty_digigeta() |
| * |
| * Ioctl to get the information for ditty. |
| * |
| * |
| * |
| */ |
| static int dgnc_tty_digigeta(struct tty_struct *tty, |
| struct digi_t __user *retinfo) |
| { |
| struct channel_t *ch; |
| struct un_t *un; |
| struct digi_t tmp; |
| unsigned long flags; |
| |
| if (!retinfo) |
| return -EFAULT; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return -EFAULT; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return -EFAULT; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return -EFAULT; |
| |
| memset(&tmp, 0, sizeof(tmp)); |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| /* |
| * dgnc_tty_digiseta() |
| * |
| * Ioctl to set the information for ditty. |
| * |
| * |
| * |
| */ |
| static int dgnc_tty_digiseta(struct tty_struct *tty, |
| struct digi_t __user *new_info) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| struct digi_t new_digi; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return -EFAULT; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return -EFAULT; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return -EFAULT; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return -EFAULT; |
| |
| if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
| return -EFAULT; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* |
| * Handle transistions to and from RTS Toggle. |
| */ |
| if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
| (new_digi.digi_flags & DIGI_RTS_TOGGLE)) |
| ch->ch_mostat &= ~(UART_MCR_RTS); |
| if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
| !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) |
| ch->ch_mostat |= (UART_MCR_RTS); |
| |
| /* |
| * Handle transistions to and from DTR Toggle. |
| */ |
| if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
| (new_digi.digi_flags & DIGI_DTR_TOGGLE)) |
| ch->ch_mostat &= ~(UART_MCR_DTR); |
| if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
| !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) |
| ch->ch_mostat |= (UART_MCR_DTR); |
| |
| memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
| |
| if (ch->ch_digi.digi_maxcps < 1) |
| ch->ch_digi.digi_maxcps = 1; |
| |
| if (ch->ch_digi.digi_maxcps > 10000) |
| ch->ch_digi.digi_maxcps = 10000; |
| |
| if (ch->ch_digi.digi_bufsize < 10) |
| ch->ch_digi.digi_bufsize = 10; |
| |
| if (ch->ch_digi.digi_maxchar < 1) |
| ch->ch_digi.digi_maxchar = 1; |
| |
| if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) |
| ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; |
| |
| if (ch->ch_digi.digi_onlen > DIGI_PLEN) |
| ch->ch_digi.digi_onlen = DIGI_PLEN; |
| |
| if (ch->ch_digi.digi_offlen > DIGI_PLEN) |
| ch->ch_digi.digi_offlen = DIGI_PLEN; |
| |
| ch->ch_bd->bd_ops->param(tty); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * dgnc_set_termios() |
| */ |
| static void dgnc_tty_set_termios(struct tty_struct *tty, |
| struct ktermios *old_termios) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_c_cflag = tty->termios.c_cflag; |
| ch->ch_c_iflag = tty->termios.c_iflag; |
| ch->ch_c_oflag = tty->termios.c_oflag; |
| ch->ch_c_lflag = tty->termios.c_lflag; |
| ch->ch_startc = tty->termios.c_cc[VSTART]; |
| ch->ch_stopc = tty->termios.c_cc[VSTOP]; |
| |
| ch->ch_bd->bd_ops->param(tty); |
| dgnc_carrier(ch); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| static void dgnc_tty_throttle(struct tty_struct *tty) |
| { |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_flags |= (CH_FORCED_STOPI); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| static void dgnc_tty_unthrottle(struct tty_struct *tty) |
| { |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_flags &= ~(CH_FORCED_STOPI); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| static void dgnc_tty_start(struct tty_struct *tty) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_flags &= ~(CH_FORCED_STOP); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| static void dgnc_tty_stop(struct tty_struct *tty) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_flags |= (CH_FORCED_STOP); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| /* |
| * dgnc_tty_flush_chars() |
| * |
| * Flush the cook buffer |
| * |
| * Note to self, and any other poor souls who venture here: |
| * |
| * flush in this case DOES NOT mean dispose of the data. |
| * instead, it means "stop buffering and send it if you |
| * haven't already." Just guess how I figured that out... SRW 2-Jun-98 |
| * |
| * It is also always called in interrupt context - JAR 8-Sept-99 |
| */ |
| static void dgnc_tty_flush_chars(struct tty_struct *tty) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* Do something maybe here */ |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| /* |
| * dgnc_tty_flush_buffer() |
| * |
| * Flush Tx buffer (make in == out) |
| */ |
| static void dgnc_tty_flush_buffer(struct tty_struct *tty) |
| { |
| struct channel_t *ch; |
| struct un_t *un; |
| unsigned long flags; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_flags &= ~CH_STOP; |
| |
| /* Flush our write queue */ |
| ch->ch_w_head = ch->ch_w_tail; |
| |
| /* Flush UARTs transmit FIFO */ |
| ch->ch_bd->bd_ops->flush_uart_write(ch); |
| |
| if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) { |
| ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY); |
| wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
| } |
| if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { |
| ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY); |
| wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
| } |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| } |
| |
| /***************************************************************************** |
| * |
| * The IOCTL function and all of its helpers |
| * |
| *****************************************************************************/ |
| |
| /* |
| * dgnc_tty_ioctl() |
| * |
| * The usual assortment of ioctl's |
| */ |
| static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct dgnc_board *bd; |
| struct channel_t *ch; |
| struct un_t *un; |
| int rc; |
| unsigned long flags; |
| void __user *uarg = (void __user *)arg; |
| |
| if (!tty || tty->magic != TTY_MAGIC) |
| return -ENODEV; |
| |
| un = tty->driver_data; |
| if (!un || un->magic != DGNC_UNIT_MAGIC) |
| return -ENODEV; |
| |
| ch = un->un_ch; |
| if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
| return -ENODEV; |
| |
| bd = ch->ch_bd; |
| if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
| return -ENODEV; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| if (un->un_open_count <= 0) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return -EIO; |
| } |
| |
| switch (cmd) { |
| /* Here are all the standard ioctl's that we MUST implement */ |
| |
| case TCSBRK: |
| /* |
| * TCSBRK is SVID version: non-zero arg --> no break |
| * this behaviour is exploited by tcdrain(). |
| * |
| * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
| * between 0.25 and 0.5 seconds so we'll ask for something |
| * in the middle: 0.375 seconds. |
| */ |
| rc = tty_check_change(tty); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| if (rc) |
| return rc; |
| |
| rc = ch->ch_bd->bd_ops->drain(tty, 0); |
| |
| if (rc) |
| return -EINTR; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
| ch->ch_bd->bd_ops->send_break(ch, 250); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| |
| case TCSBRKP: |
| /* support for POSIX tcsendbreak() |
| * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
| * between 0.25 and 0.5 seconds so we'll ask for something |
| * in the middle: 0.375 seconds. |
| */ |
| rc = tty_check_change(tty); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| if (rc) |
| return rc; |
| |
| rc = ch->ch_bd->bd_ops->drain(tty, 0); |
| if (rc) |
| return -EINTR; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_bd->bd_ops->send_break(ch, 250); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| |
| case TIOCSBRK: |
| rc = tty_check_change(tty); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| if (rc) |
| return rc; |
| |
| rc = ch->ch_bd->bd_ops->drain(tty, 0); |
| if (rc) |
| return -EINTR; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| ch->ch_bd->bd_ops->send_break(ch, 250); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| |
| case TIOCCBRK: |
| /* Do Nothing */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return 0; |
| |
| case TIOCGSOFTCAR: |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| rc = put_user(C_CLOCAL(tty) ? 1 : 0, |
| (unsigned long __user *)arg); |
| return rc; |
| |
| case TIOCSSOFTCAR: |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = get_user(arg, (unsigned long __user *)arg); |
| if (rc) |
| return rc; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
| (arg ? CLOCAL : 0)); |
| ch->ch_bd->bd_ops->param(tty); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return 0; |
| |
| case TIOCMGET: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return dgnc_get_modem_info(ch, uarg); |
| |
| case TIOCMBIS: |
| case TIOCMBIC: |
| case TIOCMSET: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return dgnc_set_modem_info(tty, cmd, uarg); |
| |
| /* |
| * Here are any additional ioctl's that we want to implement |
| */ |
| |
| case TCFLSH: |
| /* |
| * The linux tty driver doesn't have a flush |
| * input routine for the driver, assuming all backed |
| * up data is in the line disc. buffers. However, |
| * we all know that's not the case. Here, we |
| * act on the ioctl, but then lie and say we didn't |
| * so the line discipline will process the flush |
| * also. |
| */ |
| rc = tty_check_change(tty); |
| if (rc) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return rc; |
| } |
| |
| if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { |
| ch->ch_r_head = ch->ch_r_tail; |
| ch->ch_bd->bd_ops->flush_uart_read(ch); |
| /* Force queue flow control to be released, if needed */ |
| dgnc_check_queue_flow_control(ch); |
| } |
| |
| if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { |
| if (!(un->un_type == DGNC_PRINT)) { |
| ch->ch_w_head = ch->ch_w_tail; |
| ch->ch_bd->bd_ops->flush_uart_write(ch); |
| |
| if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) { |
| ch->ch_tun.un_flags &= |
| ~(UN_LOW|UN_EMPTY); |
| wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
| } |
| |
| if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { |
| ch->ch_pun.un_flags &= |
| ~(UN_LOW|UN_EMPTY); |
| wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
| } |
| } |
| } |
| |
| /* pretend we didn't recognize this IOCTL */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return -ENOIOCTLCMD; |
| case TCSETSF: |
| case TCSETSW: |
| /* |
| * The linux tty driver doesn't have a flush |
| * input routine for the driver, assuming all backed |
| * up data is in the line disc. buffers. However, |
| * we all know that's not the case. Here, we |
| * act on the ioctl, but then lie and say we didn't |
| * so the line discipline will process the flush |
| * also. |
| */ |
| if (cmd == TCSETSF) { |
| /* flush rx */ |
| ch->ch_flags &= ~CH_STOP; |
| ch->ch_r_head = ch->ch_r_tail; |
| ch->ch_bd->bd_ops->flush_uart_read(ch); |
| /* Force queue flow control to be released, if needed */ |
| dgnc_check_queue_flow_control(ch); |
| } |
| |
| /* now wait for all the output to drain */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = ch->ch_bd->bd_ops->drain(tty, 0); |
| if (rc) |
| return -EINTR; |
| |
| /* pretend we didn't recognize this */ |
| return -ENOIOCTLCMD; |
| |
| case TCSETAW: |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = ch->ch_bd->bd_ops->drain(tty, 0); |
| if (rc) |
| return -EINTR; |
| |
| /* pretend we didn't recognize this */ |
| return -ENOIOCTLCMD; |
| |
| case TCXONC: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| /* Make the ld do it */ |
| return -ENOIOCTLCMD; |
| |
| case DIGI_GETA: |
| /* get information for ditty */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return dgnc_tty_digigeta(tty, uarg); |
| |
| case DIGI_SETAW: |
| case DIGI_SETAF: |
| |
| /* set information for ditty */ |
| if (cmd == (DIGI_SETAW)) { |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = ch->ch_bd->bd_ops->drain(tty, 0); |
| |
| if (rc) |
| return -EINTR; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| } else { |
| tty_ldisc_flush(tty); |
| } |
| /* fall thru */ |
| |
| case DIGI_SETA: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return dgnc_tty_digiseta(tty, uarg); |
| |
| case DIGI_LOOPBACK: |
| { |
| uint loopback = 0; |
| /* Let go of locks when accessing user space, |
| * could sleep |
| */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = get_user(loopback, (unsigned int __user *)arg); |
| if (rc) |
| return rc; |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* Enable/disable internal loopback for this port */ |
| if (loopback) |
| ch->ch_flags |= CH_LOOPBACK; |
| else |
| ch->ch_flags &= ~(CH_LOOPBACK); |
| |
| ch->ch_bd->bd_ops->param(tty); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return 0; |
| } |
| |
| case DIGI_GETCUSTOMBAUD: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg); |
| return rc; |
| |
| case DIGI_SETCUSTOMBAUD: |
| { |
| int new_rate; |
| /* Let go of locks when accessing user space, could sleep */ |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = get_user(new_rate, (int __user *)arg); |
| if (rc) |
| return rc; |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| dgnc_set_custom_speed(ch, new_rate); |
| ch->ch_bd->bd_ops->param(tty); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return 0; |
| } |
| |
| /* |
| * This ioctl allows insertion of a character into the front |
| * of any pending data to be transmitted. |
| * |
| * This ioctl is to satify the "Send Character Immediate" |
| * call that the RealPort protocol spec requires. |
| */ |
| case DIGI_REALPORT_SENDIMMEDIATE: |
| { |
| unsigned char c; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = get_user(c, (unsigned char __user *)arg); |
| if (rc) |
| return rc; |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| ch->ch_bd->bd_ops->send_immediate_char(ch, c); |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| return 0; |
| } |
| |
| /* |
| * This ioctl returns all the current counts for the port. |
| * |
| * This ioctl is to satify the "Line Error Counters" |
| * call that the RealPort protocol spec requires. |
| */ |
| case DIGI_REALPORT_GETCOUNTERS: |
| { |
| struct digi_getcounter buf; |
| |
| buf.norun = ch->ch_err_overrun; |
| buf.noflow = 0; /* The driver doesn't keep this stat */ |
| buf.nframe = ch->ch_err_frame; |
| buf.nparity = ch->ch_err_parity; |
| buf.nbreak = ch->ch_err_break; |
| buf.rbytes = ch->ch_rxcount; |
| buf.tbytes = ch->ch_txcount; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| if (copy_to_user(uarg, &buf, sizeof(buf))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| /* |
| * This ioctl returns all current events. |
| * |
| * This ioctl is to satify the "Event Reporting" |
| * call that the RealPort protocol spec requires. |
| */ |
| case DIGI_REALPORT_GETEVENTS: |
| { |
| unsigned int events = 0; |
| |
| /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ |
| if (ch->ch_flags & CH_BREAK_SENDING) |
| events |= EV_TXB; |
| if ((ch->ch_flags & CH_STOP) || |
| (ch->ch_flags & CH_FORCED_STOP)) |
| events |= (EV_OPU | EV_OPS); |
| |
| if ((ch->ch_flags & CH_STOPI) || |
| (ch->ch_flags & CH_FORCED_STOPI)) |
| events |= (EV_IPU | EV_IPS); |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| rc = put_user(events, (unsigned int __user *)arg); |
| return rc; |
| } |
| |
| /* |
| * This ioctl returns TOUT and TIN counters based |
| * upon the values passed in by the RealPort Server. |
| * It also passes back whether the UART Transmitter is |
| * empty as well. |
| */ |
| case DIGI_REALPORT_GETBUFFERS: |
| { |
| struct digi_getbuffer buf; |
| int tdist; |
| int count; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| /* |
| * Get data from user first. |
| */ |
| if (copy_from_user(&buf, uarg, sizeof(buf))) |
| return -EFAULT; |
| |
| spin_lock_irqsave(&ch->ch_lock, flags); |
| |
| /* |
| * Figure out how much data is in our RX and TX queues. |
| */ |
| buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; |
| buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; |
| |
| /* |
| * Is the UART empty? Add that value to whats in our TX queue. |
| */ |
| count = buf.txbuf + ch->ch_bd->bd_ops->get_uart_bytes_left(ch); |
| |
| /* |
| * Figure out how much data the RealPort Server believes should |
| * be in our TX queue. |
| */ |
| tdist = (buf.tIn - buf.tOut) & 0xffff; |
| |
| /* |
| * If we have more data than the RealPort Server believes we |
| * should have, reduce our count to its amount. |
| * |
| * This count difference CAN happen because the Linux LD can |
| * insert more characters into our queue for OPOST processing |
| * that the RealPort Server doesn't know about. |
| */ |
| if (buf.txbuf > tdist) |
| buf.txbuf = tdist; |
| |
| /* |
| * Report whether our queue and UART TX are completely empty. |
| */ |
| if (count) |
| buf.txdone = 0; |
| else |
| buf.txdone = 1; |
| |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| if (copy_to_user(uarg, &buf, sizeof(buf))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| default: |
| spin_unlock_irqrestore(&ch->ch_lock, flags); |
| |
| return -ENOIOCTLCMD; |
| } |
| } |