Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /********************************************************************* |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 2 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Filename: ircomm_tty.c |
| 4 | * Version: 1.0 |
| 5 | * Description: IrCOMM serial TTY driver |
| 6 | * Status: Experimental. |
| 7 | * Author: Dag Brattli <dagb@cs.uit.no> |
| 8 | * Created at: Sun Jun 6 21:00:56 1999 |
| 9 | * Modified at: Wed Feb 23 00:09:02 2000 |
| 10 | * Modified by: Dag Brattli <dagb@cs.uit.no> |
| 11 | * Sources: serial.c and previous IrCOMM work by Takahide Higuchi |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. |
| 14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 15 | * |
| 16 | * This program is free software; you can redistribute it and/or |
| 17 | * modify it under the terms of the GNU General Public License as |
| 18 | * published by the Free Software Foundation; either version 2 of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * the License, or (at your option) any later version. |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 20 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | * GNU General Public License for more details. |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
| 27 | * along with this program; if not, write to the Free Software |
| 28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * MA 02111-1307 USA |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 30 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | ********************************************************************/ |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/init.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 36 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/sched.h> |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 38 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/termios.h> |
| 40 | #include <linux/tty.h> |
Amit Virdi | cbfd152 | 2011-05-12 01:04:40 +0000 | [diff] [blame] | 41 | #include <linux/tty_flip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/interrupt.h> |
| 43 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ |
| 44 | |
| 45 | #include <asm/uaccess.h> |
| 46 | |
| 47 | #include <net/irda/irda.h> |
| 48 | #include <net/irda/irmod.h> |
| 49 | |
| 50 | #include <net/irda/ircomm_core.h> |
| 51 | #include <net/irda/ircomm_param.h> |
| 52 | #include <net/irda/ircomm_tty_attach.h> |
| 53 | #include <net/irda/ircomm_tty.h> |
| 54 | |
| 55 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); |
| 56 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); |
| 57 | static int ircomm_tty_write(struct tty_struct * tty, |
| 58 | const unsigned char *buf, int count); |
| 59 | static int ircomm_tty_write_room(struct tty_struct *tty); |
| 60 | static void ircomm_tty_throttle(struct tty_struct *tty); |
| 61 | static void ircomm_tty_unthrottle(struct tty_struct *tty); |
| 62 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); |
| 63 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); |
| 64 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); |
| 65 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); |
| 66 | static void ircomm_tty_hangup(struct tty_struct *tty); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 67 | static void ircomm_tty_do_softint(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
| 69 | static void ircomm_tty_stop(struct tty_struct *tty); |
| 70 | |
| 71 | static int ircomm_tty_data_indication(void *instance, void *sap, |
| 72 | struct sk_buff *skb); |
| 73 | static int ircomm_tty_control_indication(void *instance, void *sap, |
| 74 | struct sk_buff *skb); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 75 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | LOCAL_FLOW cmd); |
| 77 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 78 | static const struct file_operations ircomm_tty_proc_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | #endif /* CONFIG_PROC_FS */ |
| 80 | static struct tty_driver *driver; |
| 81 | |
Adrian Bunk | d76081f | 2007-10-26 03:56:43 -0700 | [diff] [blame] | 82 | static hashbin_t *ircomm_tty = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 84 | static const struct tty_operations ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | .open = ircomm_tty_open, |
| 86 | .close = ircomm_tty_close, |
| 87 | .write = ircomm_tty_write, |
| 88 | .write_room = ircomm_tty_write_room, |
| 89 | .chars_in_buffer = ircomm_tty_chars_in_buffer, |
| 90 | .flush_buffer = ircomm_tty_flush_buffer, |
| 91 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ |
| 92 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ |
| 93 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ |
| 94 | .throttle = ircomm_tty_throttle, |
| 95 | .unthrottle = ircomm_tty_unthrottle, |
| 96 | .send_xchar = ircomm_tty_send_xchar, |
| 97 | .set_termios = ircomm_tty_set_termios, |
| 98 | .stop = ircomm_tty_stop, |
| 99 | .start = ircomm_tty_start, |
| 100 | .hangup = ircomm_tty_hangup, |
| 101 | .wait_until_sent = ircomm_tty_wait_until_sent, |
| 102 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 103 | .proc_fops = &ircomm_tty_proc_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #endif /* CONFIG_PROC_FS */ |
| 105 | }; |
| 106 | |
Jiri Slaby | 0ba9ff8 | 2012-06-04 13:35:23 +0200 | [diff] [blame] | 107 | static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise) |
| 108 | { |
| 109 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, |
| 110 | port); |
| 111 | /* |
| 112 | * Here, we use to lock those two guys, but as ircomm_param_request() |
| 113 | * does it itself, I don't see the point (and I see the deadlock). |
| 114 | * Jean II |
| 115 | */ |
| 116 | if (raise) |
| 117 | self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR; |
| 118 | else |
| 119 | self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR); |
| 120 | |
| 121 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| 122 | } |
| 123 | |
| 124 | static int ircomm_port_carrier_raised(struct tty_port *port) |
| 125 | { |
| 126 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, |
| 127 | port); |
| 128 | return self->settings.dce & IRCOMM_CD; |
| 129 | } |
| 130 | |
| 131 | static const struct tty_port_operations ircomm_port_ops = { |
| 132 | .dtr_rts = ircomm_port_raise_dtr_rts, |
| 133 | .carrier_raised = ircomm_port_carrier_raised, |
| 134 | }; |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /* |
| 137 | * Function ircomm_tty_init() |
| 138 | * |
| 139 | * Init IrCOMM TTY layer/driver |
| 140 | * |
| 141 | */ |
| 142 | static int __init ircomm_tty_init(void) |
| 143 | { |
| 144 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); |
| 145 | if (!driver) |
| 146 | return -ENOMEM; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 147 | ircomm_tty = hashbin_new(HB_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | if (ircomm_tty == NULL) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 149 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | put_tty_driver(driver); |
| 151 | return -ENOMEM; |
| 152 | } |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | driver->driver_name = "ircomm"; |
| 155 | driver->name = "ircomm"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | driver->major = IRCOMM_TTY_MAJOR; |
| 157 | driver->minor_start = IRCOMM_TTY_MINOR; |
| 158 | driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 159 | driver->subtype = SERIAL_TYPE_NORMAL; |
| 160 | driver->init_termios = tty_std_termios; |
| 161 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 162 | driver->flags = TTY_DRIVER_REAL_RAW; |
| 163 | tty_set_operations(driver, &ops); |
| 164 | if (tty_register_driver(driver)) { |
| 165 | IRDA_ERROR("%s(): Couldn't register serial driver\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 166 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | put_tty_driver(driver); |
| 168 | return -1; |
| 169 | } |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) |
| 174 | { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 175 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | IRDA_ASSERT(self != NULL, return;); |
| 178 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 179 | |
| 180 | ircomm_tty_shutdown(self); |
| 181 | |
| 182 | self->magic = 0; |
| 183 | kfree(self); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Function ircomm_tty_cleanup () |
| 188 | * |
| 189 | * Remove IrCOMM TTY layer/driver |
| 190 | * |
| 191 | */ |
| 192 | static void __exit ircomm_tty_cleanup(void) |
| 193 | { |
| 194 | int ret; |
| 195 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 196 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | ret = tty_unregister_driver(driver); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 199 | if (ret) { |
| 200 | IRDA_ERROR("%s(), failed to unregister driver\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 201 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | return; |
| 203 | } |
| 204 | |
| 205 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); |
| 206 | put_tty_driver(driver); |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Function ircomm_startup (self) |
| 211 | * |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 212 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | * |
| 214 | */ |
| 215 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) |
| 216 | { |
| 217 | notify_t notify; |
| 218 | int ret = -ENODEV; |
| 219 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 220 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | IRDA_ASSERT(self != NULL, return -1;); |
| 223 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 224 | |
| 225 | /* Check if already open */ |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 226 | if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 227 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | /* Register with IrCOMM */ |
| 232 | irda_notify_init(¬ify); |
| 233 | /* These callbacks we must handle ourselves */ |
| 234 | notify.data_indication = ircomm_tty_data_indication; |
| 235 | notify.udata_indication = ircomm_tty_control_indication; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 236 | notify.flow_indication = ircomm_tty_flow_indication; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | /* Use the ircomm_tty interface for these ones */ |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 239 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | notify.connect_confirm = ircomm_tty_connect_confirm; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 241 | notify.connect_indication = ircomm_tty_connect_indication; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
| 243 | notify.instance = self; |
| 244 | |
| 245 | if (!self->ircomm) { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 246 | self->ircomm = ircomm_open(¬ify, self->service_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | self->line); |
| 248 | } |
| 249 | if (!self->ircomm) |
| 250 | goto err; |
| 251 | |
| 252 | self->slsap_sel = self->ircomm->slsap_sel; |
| 253 | |
| 254 | /* Connect IrCOMM link with remote device */ |
| 255 | ret = ircomm_tty_attach_cable(self); |
| 256 | if (ret < 0) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 257 | IRDA_ERROR("%s(), error attaching cable!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | goto err; |
| 259 | } |
| 260 | |
| 261 | return 0; |
| 262 | err: |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 263 | clear_bit(ASYNCB_INITIALIZED, &self->port.flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Function ircomm_block_til_ready (self, filp) |
| 269 | * |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 270 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | * |
| 272 | */ |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 273 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 274 | struct tty_struct *tty, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 276 | struct tty_port *port = &self->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | DECLARE_WAITQUEUE(wait, current); |
| 278 | int retval; |
| 279 | int do_clocal = 0, extra_count = 0; |
| 280 | unsigned long flags; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 281 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 282 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | /* |
| 285 | * If non-blocking mode is set, or the port is not enabled, |
| 286 | * then make the check up front and then exit. |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 287 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ |
| 289 | /* nonblock mode is set or port is not enabled */ |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 290 | port->flags |= ASYNC_NORMAL_ACTIVE; |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 291 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | if (tty->termios->c_cflag & CLOCAL) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 296 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | do_clocal = 1; |
| 298 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | /* Wait for carrier detect and the line to become |
| 301 | * free (i.e., not in use by the callout). While we are in |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 302 | * this loop, port->count is dropped by one, so that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | * mgsl_close() knows when to free things. We restore it upon |
| 304 | * exit, either normal or abnormal. |
| 305 | */ |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | retval = 0; |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 308 | add_wait_queue(&port->open_wait, &wait); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 311 | __FILE__, __LINE__, tty->driver->name, port->count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 313 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | if (!tty_hung_up_p(filp)) { |
| 315 | extra_count = 1; |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 316 | port->count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 318 | spin_unlock_irqrestore(&port->lock, flags); |
| 319 | port->blocked_open++; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | while (1) { |
Jiri Slaby | 0ba9ff8 | 2012-06-04 13:35:23 +0200 | [diff] [blame] | 322 | if (tty->termios->c_cflag & CBAUD) |
| 323 | tty_port_raise_dtr_rts(port); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | current->state = TASK_INTERRUPTIBLE; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | if (tty_hung_up_p(filp) || |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 328 | !test_bit(ASYNCB_INITIALIZED, &port->flags)) { |
| 329 | retval = (port->flags & ASYNC_HUP_NOTIFY) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | -EAGAIN : -ERESTARTSYS; |
| 331 | break; |
| 332 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 333 | |
| 334 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | * Check if link is ready now. Even if CLOCAL is |
| 336 | * specified, we cannot return before the IrCOMM link is |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 337 | * ready |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | */ |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 339 | if (!test_bit(ASYNCB_CLOSING, &port->flags) && |
Jiri Slaby | 0ba9ff8 | 2012-06-04 13:35:23 +0200 | [diff] [blame] | 340 | (do_clocal || tty_port_carrier_raised(port)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | self->state == IRCOMM_TTY_READY) |
| 342 | { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 343 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (signal_pending(current)) { |
| 347 | retval = -ERESTARTSYS; |
| 348 | break; |
| 349 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 352 | __FILE__, __LINE__, tty->driver->name, port->count); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | schedule(); |
| 355 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | __set_current_state(TASK_RUNNING); |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 358 | remove_wait_queue(&port->open_wait, &wait); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if (extra_count) { |
| 361 | /* ++ is not atomic, so this should be protected - Jean II */ |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 362 | spin_lock_irqsave(&port->lock, flags); |
| 363 | port->count++; |
| 364 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 366 | port->blocked_open--; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 369 | __FILE__, __LINE__, tty->driver->name, port->count); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | if (!retval) |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 372 | port->flags |= ASYNC_NORMAL_ACTIVE; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 373 | |
| 374 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Function ircomm_tty_open (tty, filp) |
| 379 | * |
| 380 | * This routine is called when a particular tty device is opened. This |
| 381 | * routine is mandatory; if this routine is not filled in, the attempted |
| 382 | * open will fail with ENODEV. |
| 383 | */ |
| 384 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) |
| 385 | { |
| 386 | struct ircomm_tty_cb *self; |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 387 | unsigned int line = tty->index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | unsigned long flags; |
| 389 | int ret; |
| 390 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 391 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | /* Check if instance already exists */ |
| 394 | self = hashbin_lock_find(ircomm_tty, line, NULL); |
| 395 | if (!self) { |
| 396 | /* No, so make new instance */ |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 397 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (self == NULL) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 399 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | return -ENOMEM; |
| 401 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 402 | |
Jiri Slaby | a3cc9fc | 2012-06-04 13:35:16 +0200 | [diff] [blame] | 403 | tty_port_init(&self->port); |
Jiri Slaby | 0ba9ff8 | 2012-06-04 13:35:23 +0200 | [diff] [blame] | 404 | self->port.ops = &ircomm_port_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | self->magic = IRCOMM_TTY_MAGIC; |
| 406 | self->flow = FLOW_STOP; |
| 407 | |
| 408 | self->line = line; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 409 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
| 411 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | /* Init some important stuff */ |
| 414 | init_timer(&self->watchdog_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | spin_lock_init(&self->spinlock); |
| 416 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 417 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | * Force TTY into raw mode by default which is usually what |
| 419 | * we want for IrCOMM and IrLPT. This way applications will |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 420 | * not have to twiddle with printcap etc. |
Alan Cox | ad36b88 | 2009-01-02 13:50:20 +0000 | [diff] [blame] | 421 | * |
| 422 | * Note this is completely usafe and doesn't work properly |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | */ |
| 424 | tty->termios->c_iflag = 0; |
| 425 | tty->termios->c_oflag = 0; |
| 426 | |
| 427 | /* Insert into hash */ |
Jiri Slaby | a3cc9fc | 2012-06-04 13:35:16 +0200 | [diff] [blame] | 428 | /* FIXME there is a window from find to here */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); |
| 430 | } |
| 431 | /* ++ is not atomic, so this should be protected - Jean II */ |
Jiri Slaby | e673927 | 2012-06-04 13:35:20 +0200 | [diff] [blame] | 432 | spin_lock_irqsave(&self->port.lock, flags); |
Jiri Slaby | 580d27b | 2012-06-04 13:35:18 +0200 | [diff] [blame] | 433 | self->port.count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | tty->driver_data = self; |
Jiri Slaby | e673927 | 2012-06-04 13:35:20 +0200 | [diff] [blame] | 436 | spin_unlock_irqrestore(&self->port.lock, flags); |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 437 | tty_port_tty_set(&self->port, tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 439 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
Jiri Slaby | 580d27b | 2012-06-04 13:35:18 +0200 | [diff] [blame] | 440 | self->line, self->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | /* Not really used by us, but lets do it anyway */ |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 443 | tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | /* |
| 446 | * If the port is the middle of closing, bail out now |
| 447 | */ |
| 448 | if (tty_hung_up_p(filp) || |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 449 | test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | /* Hm, why are we blocking on ASYNC_CLOSING if we |
| 452 | * do return -EAGAIN/-ERESTARTSYS below anyway? |
| 453 | * IMHO it's either not needed in the first place |
| 454 | * or for some reason we need to make sure the async |
| 455 | * closing has been finished - if so, wouldn't we |
| 456 | * probably better sleep uninterruptible? |
| 457 | */ |
| 458 | |
Jiri Slaby | a3cc9fc | 2012-06-04 13:35:16 +0200 | [diff] [blame] | 459 | if (wait_event_interruptible(self->port.close_wait, |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 460 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 462 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return -ERESTARTSYS; |
| 464 | } |
| 465 | |
| 466 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 467 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 468 | -EAGAIN : -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | #else |
| 470 | return -EAGAIN; |
| 471 | #endif |
| 472 | } |
| 473 | |
| 474 | /* Check if this is a "normal" ircomm device, or an irlpt device */ |
| 475 | if (line < 0x10) { |
| 476 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
| 477 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ |
| 478 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ |
| 479 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 480 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } else { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 482 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | self->service_type = IRCOMM_3_WIRE_RAW; |
| 484 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ |
| 485 | } |
| 486 | |
| 487 | ret = ircomm_tty_startup(self); |
| 488 | if (ret) |
| 489 | return ret; |
| 490 | |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 491 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | if (ret) { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 493 | IRDA_DEBUG(2, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 494 | "%s(), returning after block_til_ready with %d\n", __func__ , |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | ret); |
| 496 | |
| 497 | return ret; |
| 498 | } |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Function ircomm_tty_close (tty, filp) |
| 504 | * |
| 505 | * This routine is called when a particular tty device is closed. |
| 506 | * |
| 507 | */ |
| 508 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) |
| 509 | { |
| 510 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 511 | struct tty_port *port = &self->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | unsigned long flags; |
| 513 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 514 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | IRDA_ASSERT(self != NULL, return;); |
| 517 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 518 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 519 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | if (tty_hung_up_p(filp)) { |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 522 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 524 | IRDA_DEBUG(0, "%s(), returning 1\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | return; |
| 526 | } |
| 527 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 528 | if ((tty->count == 1) && (port->count != 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | /* |
| 530 | * Uh, oh. tty->count is 1, which means that the tty |
| 531 | * structure will be freed. state->count should always |
| 532 | * be one in these conditions. If it's greater than |
| 533 | * one, we've got real problems, since it means the |
| 534 | * serial port won't be shutdown. |
| 535 | */ |
| 536 | IRDA_DEBUG(0, "%s(), bad serial port count; " |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 537 | "tty->count is 1, state->count is %d\n", __func__ , |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 538 | port->count); |
| 539 | port->count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 542 | if (--port->count < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 544 | __func__, self->line, port->count); |
| 545 | port->count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 547 | if (port->count) { |
| 548 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 550 | IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return; |
| 552 | } |
| 553 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 554 | set_bit(ASYNCB_CLOSING, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 556 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /* |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 559 | * Now we wait for the transmit buffer to clear; and we notify |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | * the line discipline to only process XON/XOFF characters. |
| 561 | */ |
| 562 | tty->closing = 1; |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 563 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 564 | tty_wait_until_sent_from_close(tty, port->closing_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
| 566 | ircomm_tty_shutdown(self); |
| 567 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 568 | tty_driver_flush_buffer(tty); |
| 569 | tty_ldisc_flush(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
Jiri Slaby | a1e8440 | 2012-06-04 13:35:24 +0200 | [diff] [blame^] | 571 | tty_port_close_end(port, tty); |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 572 | tty_port_tty_set(port, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Function ircomm_tty_flush_buffer (tty) |
| 577 | * |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 578 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | * |
| 580 | */ |
| 581 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) |
| 582 | { |
| 583 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 584 | |
| 585 | IRDA_ASSERT(self != NULL, return;); |
| 586 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 587 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 588 | /* |
| 589 | * Let do_softint() do this to avoid race condition with |
| 590 | * do_softint() ;-) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | */ |
| 592 | schedule_work(&self->tqueue); |
| 593 | } |
| 594 | |
| 595 | /* |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 596 | * Function ircomm_tty_do_softint (work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | * |
| 598 | * We use this routine to give the write wakeup to the user at at a |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 599 | * safe time (as fast as possible after write have completed). This |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | * can be compared to the Tx interrupt. |
| 601 | */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 602 | static void ircomm_tty_do_softint(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 604 | struct ircomm_tty_cb *self = |
| 605 | container_of(work, struct ircomm_tty_cb, tqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | struct tty_struct *tty; |
| 607 | unsigned long flags; |
| 608 | struct sk_buff *skb, *ctrl_skb; |
| 609 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 610 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | if (!self || self->magic != IRCOMM_TTY_MAGIC) |
| 613 | return; |
| 614 | |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 615 | tty = tty_port_tty_get(&self->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | if (!tty) |
| 617 | return; |
| 618 | |
| 619 | /* Unlink control buffer */ |
| 620 | spin_lock_irqsave(&self->spinlock, flags); |
| 621 | |
| 622 | ctrl_skb = self->ctrl_skb; |
| 623 | self->ctrl_skb = NULL; |
| 624 | |
| 625 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 626 | |
| 627 | /* Flush control buffer if any */ |
| 628 | if(ctrl_skb) { |
| 629 | if(self->flow == FLOW_START) |
| 630 | ircomm_control_request(self->ircomm, ctrl_skb); |
| 631 | /* Drop reference count - see ircomm_ttp_data_request(). */ |
| 632 | dev_kfree_skb(ctrl_skb); |
| 633 | } |
| 634 | |
| 635 | if (tty->hw_stopped) |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 636 | goto put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
| 638 | /* Unlink transmit buffer */ |
| 639 | spin_lock_irqsave(&self->spinlock, flags); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | skb = self->tx_skb; |
| 642 | self->tx_skb = NULL; |
| 643 | |
| 644 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 645 | |
| 646 | /* Flush transmit buffer if any */ |
| 647 | if (skb) { |
| 648 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); |
| 649 | /* Drop reference count - see ircomm_ttp_data_request(). */ |
| 650 | dev_kfree_skb(skb); |
| 651 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | /* Check if user (still) wants to be waken up */ |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 654 | tty_wakeup(tty); |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 655 | put: |
| 656 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | /* |
| 660 | * Function ircomm_tty_write (tty, buf, count) |
| 661 | * |
| 662 | * This routine is called by the kernel to write a series of characters |
| 663 | * to the tty device. The characters may come from user space or kernel |
| 664 | * space. This routine will return the number of characters actually |
| 665 | * accepted for writing. This routine is mandatory. |
| 666 | */ |
| 667 | static int ircomm_tty_write(struct tty_struct *tty, |
| 668 | const unsigned char *buf, int count) |
| 669 | { |
| 670 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 671 | unsigned long flags; |
| 672 | struct sk_buff *skb; |
| 673 | int tailroom = 0; |
| 674 | int len = 0; |
| 675 | int size; |
| 676 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 677 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | tty->hw_stopped); |
| 679 | |
| 680 | IRDA_ASSERT(self != NULL, return -1;); |
| 681 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 682 | |
| 683 | /* We may receive packets from the TTY even before we have finished |
| 684 | * our setup. Not cool. |
| 685 | * The problem is that we don't know the final header and data size |
| 686 | * to create the proper skb, so any skb we would create would have |
| 687 | * bogus header and data size, so need care. |
| 688 | * We use a bogus header size to safely detect this condition. |
| 689 | * Another problem is that hw_stopped was set to 0 way before it |
| 690 | * should be, so we would drop this skb. It should now be fixed. |
| 691 | * One option is to not accept data until we are properly setup. |
| 692 | * But, I suspect that when it happens, the ppp line discipline |
| 693 | * just "drops" the data, which might screw up connect scripts. |
| 694 | * The second option is to create a "safe skb", with large header |
| 695 | * and small size (see ircomm_tty_open() for values). |
| 696 | * We just need to make sure that when the real values get filled, |
| 697 | * we don't mess up the original "safe skb" (see tx_data_size). |
| 698 | * Jean II */ |
| 699 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 700 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
| 702 | /* We didn't consume anything, TTY will retry */ |
| 703 | return 0; |
| 704 | #endif |
| 705 | } |
| 706 | |
| 707 | if (count < 1) |
| 708 | return 0; |
| 709 | |
| 710 | /* Protect our manipulation of self->tx_skb and related */ |
| 711 | spin_lock_irqsave(&self->spinlock, flags); |
| 712 | |
| 713 | /* Fetch current transmit buffer */ |
| 714 | skb = self->tx_skb; |
| 715 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 716 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | * Send out all the data we get, possibly as multiple fragmented |
| 718 | * frames, but this will only happen if the data is larger than the |
| 719 | * max data size. The normal case however is just the opposite, and |
| 720 | * this function may be called multiple times, and will then actually |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 721 | * defragment the data and send it out as one packet as soon as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | * possible, but at a safer point in time |
| 723 | */ |
| 724 | while (count) { |
| 725 | size = count; |
| 726 | |
| 727 | /* Adjust data size to the max data size */ |
| 728 | if (size > self->max_data_size) |
| 729 | size = self->max_data_size; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 730 | |
| 731 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | * Do we already have a buffer ready for transmit, or do |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 733 | * we need to allocate a new frame |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | */ |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 735 | if (skb) { |
| 736 | /* |
| 737 | * Any room for more data at the end of the current |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | * transmit buffer? Cannot use skb_tailroom, since |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 739 | * dev_alloc_skb gives us a larger skb than we |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | * requested |
| 741 | * Note : use tx_data_size, because max_data_size |
| 742 | * may have changed and we don't want to overwrite |
| 743 | * the skb. - Jean II |
| 744 | */ |
| 745 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { |
| 746 | /* Adjust data to tailroom */ |
| 747 | if (size > tailroom) |
| 748 | size = tailroom; |
| 749 | } else { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 750 | /* |
| 751 | * Current transmit frame is full, so break |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | * out, so we can send it as soon as possible |
| 753 | */ |
| 754 | break; |
| 755 | } |
| 756 | } else { |
| 757 | /* Prepare a full sized frame */ |
Samuel Ortiz | 485fb2c | 2006-07-21 14:50:41 -0700 | [diff] [blame] | 758 | skb = alloc_skb(self->max_data_size+ |
| 759 | self->max_header_size, |
| 760 | GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | if (!skb) { |
| 762 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 763 | return -ENOBUFS; |
| 764 | } |
| 765 | skb_reserve(skb, self->max_header_size); |
| 766 | self->tx_skb = skb; |
| 767 | /* Remember skb size because max_data_size may |
| 768 | * change later on - Jean II */ |
| 769 | self->tx_data_size = self->max_data_size; |
| 770 | } |
| 771 | |
| 772 | /* Copy data */ |
| 773 | memcpy(skb_put(skb,size), buf + len, size); |
| 774 | |
| 775 | count -= size; |
| 776 | len += size; |
| 777 | } |
| 778 | |
| 779 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 780 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 781 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | * Schedule a new thread which will transmit the frame as soon |
| 783 | * as possible, but at a safe point in time. We do this so the |
| 784 | * "user" can give us data multiple times, as PPP does (because of |
| 785 | * its 256 byte tx buffer). We will then defragment and send out |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 786 | * all this data as one single packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | */ |
| 788 | schedule_work(&self->tqueue); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | return len; |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * Function ircomm_tty_write_room (tty) |
| 795 | * |
| 796 | * This routine returns the numbers of characters the tty driver will |
| 797 | * accept for queuing to be written. This number is subject to change as |
| 798 | * output buffers get emptied, or if the output flow control is acted. |
| 799 | */ |
| 800 | static int ircomm_tty_write_room(struct tty_struct *tty) |
| 801 | { |
| 802 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 803 | unsigned long flags; |
| 804 | int ret; |
| 805 | |
| 806 | IRDA_ASSERT(self != NULL, return -1;); |
| 807 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 808 | |
| 809 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
| 810 | /* max_header_size tells us if the channel is initialised or not. */ |
| 811 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) |
| 812 | /* Don't bother us yet */ |
| 813 | return 0; |
| 814 | #endif |
| 815 | |
| 816 | /* Check if we are allowed to transmit any data. |
| 817 | * hw_stopped is the regular flow control. |
| 818 | * Jean II */ |
| 819 | if (tty->hw_stopped) |
| 820 | ret = 0; |
| 821 | else { |
| 822 | spin_lock_irqsave(&self->spinlock, flags); |
| 823 | if (self->tx_skb) |
| 824 | ret = self->tx_data_size - self->tx_skb->len; |
| 825 | else |
| 826 | ret = self->max_data_size; |
| 827 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 828 | } |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 829 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
| 831 | return ret; |
| 832 | } |
| 833 | |
| 834 | /* |
| 835 | * Function ircomm_tty_wait_until_sent (tty, timeout) |
| 836 | * |
| 837 | * This routine waits until the device has written out all of the |
| 838 | * characters in its transmitter FIFO. |
| 839 | */ |
| 840 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) |
| 841 | { |
| 842 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 843 | unsigned long orig_jiffies, poll_time; |
| 844 | unsigned long flags; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 845 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 846 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
| 848 | IRDA_ASSERT(self != NULL, return;); |
| 849 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 850 | |
| 851 | orig_jiffies = jiffies; |
| 852 | |
| 853 | /* Set poll time to 200 ms */ |
| 854 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); |
| 855 | |
| 856 | spin_lock_irqsave(&self->spinlock, flags); |
| 857 | while (self->tx_skb && self->tx_skb->len) { |
| 858 | spin_unlock_irqrestore(&self->spinlock, flags); |
Nishanth Aravamudan | 121caf5 | 2005-09-12 14:15:34 -0700 | [diff] [blame] | 859 | schedule_timeout_interruptible(poll_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | spin_lock_irqsave(&self->spinlock, flags); |
| 861 | if (signal_pending(current)) |
| 862 | break; |
| 863 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 864 | break; |
| 865 | } |
| 866 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 867 | current->state = TASK_RUNNING; |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Function ircomm_tty_throttle (tty) |
| 872 | * |
| 873 | * This routine notifies the tty driver that input buffers for the line |
| 874 | * discipline are close to full, and it should somehow signal that no |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 875 | * more characters should be sent to the tty. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | */ |
| 877 | static void ircomm_tty_throttle(struct tty_struct *tty) |
| 878 | { |
| 879 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 880 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 881 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
| 883 | IRDA_ASSERT(self != NULL, return;); |
| 884 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 885 | |
| 886 | /* Software flow control? */ |
| 887 | if (I_IXOFF(tty)) |
| 888 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | /* Hardware flow control? */ |
| 891 | if (tty->termios->c_cflag & CRTSCTS) { |
| 892 | self->settings.dte &= ~IRCOMM_RTS; |
| 893 | self->settings.dte |= IRCOMM_DELTA_RTS; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| 896 | } |
| 897 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 898 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | /* |
| 902 | * Function ircomm_tty_unthrottle (tty) |
| 903 | * |
| 904 | * This routine notifies the tty drivers that it should signals that |
| 905 | * characters can now be sent to the tty without fear of overrunning the |
| 906 | * input buffers of the line disciplines. |
| 907 | */ |
| 908 | static void ircomm_tty_unthrottle(struct tty_struct *tty) |
| 909 | { |
| 910 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 911 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 912 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
| 914 | IRDA_ASSERT(self != NULL, return;); |
| 915 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 916 | |
| 917 | /* Using software flow control? */ |
| 918 | if (I_IXOFF(tty)) { |
| 919 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); |
| 920 | } |
| 921 | |
| 922 | /* Using hardware flow control? */ |
| 923 | if (tty->termios->c_cflag & CRTSCTS) { |
| 924 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
| 925 | |
| 926 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 927 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 929 | ircomm_flow_request(self->ircomm, FLOW_START); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | /* |
| 933 | * Function ircomm_tty_chars_in_buffer (tty) |
| 934 | * |
| 935 | * Indicates if there are any data in the buffer |
| 936 | * |
| 937 | */ |
| 938 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) |
| 939 | { |
| 940 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 941 | unsigned long flags; |
| 942 | int len = 0; |
| 943 | |
| 944 | IRDA_ASSERT(self != NULL, return -1;); |
| 945 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 946 | |
| 947 | spin_lock_irqsave(&self->spinlock, flags); |
| 948 | |
| 949 | if (self->tx_skb) |
| 950 | len = self->tx_skb->len; |
| 951 | |
| 952 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 953 | |
| 954 | return len; |
| 955 | } |
| 956 | |
| 957 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) |
| 958 | { |
| 959 | unsigned long flags; |
| 960 | |
| 961 | IRDA_ASSERT(self != NULL, return;); |
| 962 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 963 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 964 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 966 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | return; |
| 968 | |
| 969 | ircomm_tty_detach_cable(self); |
| 970 | |
| 971 | spin_lock_irqsave(&self->spinlock, flags); |
| 972 | |
| 973 | del_timer(&self->watchdog_timer); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 974 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | /* Free parameter buffer */ |
| 976 | if (self->ctrl_skb) { |
| 977 | dev_kfree_skb(self->ctrl_skb); |
| 978 | self->ctrl_skb = NULL; |
| 979 | } |
| 980 | |
| 981 | /* Free transmit buffer */ |
| 982 | if (self->tx_skb) { |
| 983 | dev_kfree_skb(self->tx_skb); |
| 984 | self->tx_skb = NULL; |
| 985 | } |
| 986 | |
| 987 | if (self->ircomm) { |
| 988 | ircomm_close(self->ircomm); |
| 989 | self->ircomm = NULL; |
| 990 | } |
| 991 | |
| 992 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 993 | } |
| 994 | |
| 995 | /* |
| 996 | * Function ircomm_tty_hangup (tty) |
| 997 | * |
| 998 | * This routine notifies the tty driver that it should hangup the tty |
| 999 | * device. |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1000 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | */ |
| 1002 | static void ircomm_tty_hangup(struct tty_struct *tty) |
| 1003 | { |
| 1004 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 1005 | struct tty_port *port = &self->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | unsigned long flags; |
| 1007 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1008 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
| 1010 | IRDA_ASSERT(self != NULL, return;); |
| 1011 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | /* ircomm_tty_flush_buffer(tty); */ |
| 1014 | ircomm_tty_shutdown(self); |
| 1015 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 1016 | spin_lock_irqsave(&port->lock, flags); |
| 1017 | port->flags &= ~ASYNC_NORMAL_ACTIVE; |
| 1018 | if (port->tty) { |
| 1019 | set_bit(TTY_IO_ERROR, &port->tty->flags); |
| 1020 | tty_kref_put(port->tty); |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1021 | } |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 1022 | port->tty = NULL; |
| 1023 | port->count = 0; |
| 1024 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Jiri Slaby | 38c5803 | 2012-06-04 13:35:22 +0200 | [diff] [blame] | 1026 | wake_up_interruptible(&port->open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * Function ircomm_tty_send_xchar (tty, ch) |
| 1031 | * |
| 1032 | * This routine is used to send a high-priority XON/XOFF character to |
| 1033 | * the device. |
| 1034 | */ |
| 1035 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) |
| 1036 | { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1037 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | /* |
| 1041 | * Function ircomm_tty_start (tty) |
| 1042 | * |
| 1043 | * This routine notifies the tty driver that it resume sending |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1044 | * characters to the tty device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | */ |
| 1046 | void ircomm_tty_start(struct tty_struct *tty) |
| 1047 | { |
| 1048 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 1049 | |
| 1050 | ircomm_flow_request(self->ircomm, FLOW_START); |
| 1051 | } |
| 1052 | |
| 1053 | /* |
| 1054 | * Function ircomm_tty_stop (tty) |
| 1055 | * |
| 1056 | * This routine notifies the tty driver that it should stop outputting |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1057 | * characters to the tty device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | */ |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1059 | static void ircomm_tty_stop(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | { |
| 1061 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 1062 | |
| 1063 | IRDA_ASSERT(self != NULL, return;); |
| 1064 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1065 | |
| 1066 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * Function ircomm_check_modem_status (self) |
| 1071 | * |
| 1072 | * Check for any changes in the DCE's line settings. This function should |
| 1073 | * be called whenever the dce parameter settings changes, to update the |
| 1074 | * flow control settings and other things |
| 1075 | */ |
| 1076 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) |
| 1077 | { |
| 1078 | struct tty_struct *tty; |
| 1079 | int status; |
| 1080 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1081 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
| 1083 | IRDA_ASSERT(self != NULL, return;); |
| 1084 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1085 | |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1086 | tty = tty_port_tty_get(&self->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
| 1088 | status = self->settings.dce; |
| 1089 | |
| 1090 | if (status & IRCOMM_DCE_DELTA_ANY) { |
| 1091 | /*wake_up_interruptible(&self->delta_msr_wait);*/ |
| 1092 | } |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1093 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1094 | IRDA_DEBUG(2, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1095 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | (status & IRCOMM_CD) ? "on" : "off"); |
| 1097 | |
| 1098 | if (status & IRCOMM_CD) { |
Jiri Slaby | a3cc9fc | 2012-06-04 13:35:16 +0200 | [diff] [blame] | 1099 | wake_up_interruptible(&self->port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } else { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1101 | IRDA_DEBUG(2, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1102 | "%s(), Doing serial hangup..\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | if (tty) |
| 1104 | tty_hangup(tty); |
| 1105 | |
| 1106 | /* Hangup will remote the tty, so better break out */ |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1107 | goto put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | } |
| 1109 | } |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1110 | if (tty && self->port.flags & ASYNC_CTS_FLOW) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | if (tty->hw_stopped) { |
| 1112 | if (status & IRCOMM_CTS) { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1113 | IRDA_DEBUG(2, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1114 | "%s(), CTS tx start...\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | tty->hw_stopped = 0; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | /* Wake up processes blocked on open */ |
Jiri Slaby | a3cc9fc | 2012-06-04 13:35:16 +0200 | [diff] [blame] | 1118 | wake_up_interruptible(&self->port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | schedule_work(&self->tqueue); |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1121 | goto put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | } |
| 1123 | } else { |
| 1124 | if (!(status & IRCOMM_CTS)) { |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1125 | IRDA_DEBUG(2, |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1126 | "%s(), CTS tx stop...\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | tty->hw_stopped = 1; |
| 1128 | } |
| 1129 | } |
| 1130 | } |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1131 | put: |
| 1132 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * Function ircomm_tty_data_indication (instance, sap, skb) |
| 1137 | * |
| 1138 | * Handle incoming data, and deliver it to the line discipline |
| 1139 | * |
| 1140 | */ |
| 1141 | static int ircomm_tty_data_indication(void *instance, void *sap, |
| 1142 | struct sk_buff *skb) |
| 1143 | { |
| 1144 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1145 | struct tty_struct *tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1147 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | IRDA_ASSERT(self != NULL, return -1;); |
| 1150 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 1151 | IRDA_ASSERT(skb != NULL, return -1;); |
| 1152 | |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1153 | tty = tty_port_tty_get(&self->port); |
| 1154 | if (!tty) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1155 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | return 0; |
| 1157 | } |
| 1158 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1159 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | * If we receive data when hardware is stopped then something is wrong. |
| 1161 | * We try to poll the peers line settings to check if we are up todate. |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1162 | * Devices like WinCE can do this, and since they don't send any |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | * params, we can just as well declare the hardware for running. |
| 1164 | */ |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1165 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1166 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
| 1168 | |
| 1169 | /* We can just as well declare the hardware for running */ |
| 1170 | ircomm_tty_send_initial_parameters(self); |
| 1171 | ircomm_tty_link_established(self); |
| 1172 | } |
| 1173 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1174 | /* |
Amit Virdi | cbfd152 | 2011-05-12 01:04:40 +0000 | [diff] [blame] | 1175 | * Use flip buffer functions since the code may be called from interrupt |
| 1176 | * context |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | */ |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1178 | tty_insert_flip_string(tty, skb->data, skb->len); |
| 1179 | tty_flip_buffer_push(tty); |
| 1180 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
| 1182 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ |
| 1183 | |
| 1184 | return 0; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * Function ircomm_tty_control_indication (instance, sap, skb) |
| 1189 | * |
| 1190 | * Parse all incoming parameters (easy!) |
| 1191 | * |
| 1192 | */ |
| 1193 | static int ircomm_tty_control_indication(void *instance, void *sap, |
| 1194 | struct sk_buff *skb) |
| 1195 | { |
| 1196 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| 1197 | int clen; |
| 1198 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1199 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | IRDA_ASSERT(self != NULL, return -1;); |
| 1202 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 1203 | IRDA_ASSERT(skb != NULL, return -1;); |
| 1204 | |
| 1205 | clen = skb->data[0]; |
| 1206 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1207 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | &ircomm_param_info); |
| 1209 | |
| 1210 | /* No need to kfree_skb - see ircomm_control_indication() */ |
| 1211 | |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
| 1215 | /* |
| 1216 | * Function ircomm_tty_flow_indication (instance, sap, cmd) |
| 1217 | * |
| 1218 | * This function is called by IrTTP when it wants us to slow down the |
| 1219 | * transmission of data. We just mark the hardware as stopped, and wait |
| 1220 | * for IrTTP to notify us that things are OK again. |
| 1221 | */ |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1222 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | LOCAL_FLOW cmd) |
| 1224 | { |
| 1225 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| 1226 | struct tty_struct *tty; |
| 1227 | |
| 1228 | IRDA_ASSERT(self != NULL, return;); |
| 1229 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1230 | |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1231 | tty = tty_port_tty_get(&self->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
| 1233 | switch (cmd) { |
| 1234 | case FLOW_START: |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1235 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1236 | if (tty) |
| 1237 | tty->hw_stopped = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | |
| 1239 | /* ircomm_tty_do_softint will take care of the rest */ |
| 1240 | schedule_work(&self->tqueue); |
| 1241 | break; |
| 1242 | default: /* If we get here, something is very wrong, better stop */ |
| 1243 | case FLOW_STOP: |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1244 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1245 | if (tty) |
| 1246 | tty->hw_stopped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | break; |
| 1248 | } |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1249 | |
| 1250 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | self->flow = cmd; |
| 1252 | } |
| 1253 | |
Pavel Emelyanov | 92b05e13 | 2007-12-05 02:18:48 -0800 | [diff] [blame] | 1254 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1255 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | { |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1257 | struct tty_struct *tty; |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1258 | char sep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1260 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1262 | seq_puts(m, "Service type: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | if (self->service_type & IRCOMM_9_WIRE) |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1264 | seq_puts(m, "9_WIRE"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | else if (self->service_type & IRCOMM_3_WIRE) |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1266 | seq_puts(m, "3_WIRE"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1268 | seq_puts(m, "3_WIRE_RAW"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | else |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1270 | seq_puts(m, "No common service type!\n"); |
| 1271 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1273 | seq_printf(m, "Port name: %s\n", self->settings.port_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1275 | seq_printf(m, "DTE status:"); |
| 1276 | sep = ' '; |
| 1277 | if (self->settings.dte & IRCOMM_RTS) { |
| 1278 | seq_printf(m, "%cRTS", sep); |
| 1279 | sep = '|'; |
| 1280 | } |
| 1281 | if (self->settings.dte & IRCOMM_DTR) { |
| 1282 | seq_printf(m, "%cDTR", sep); |
| 1283 | sep = '|'; |
| 1284 | } |
| 1285 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1287 | seq_puts(m, "DCE status:"); |
| 1288 | sep = ' '; |
| 1289 | if (self->settings.dce & IRCOMM_CTS) { |
| 1290 | seq_printf(m, "%cCTS", sep); |
| 1291 | sep = '|'; |
| 1292 | } |
| 1293 | if (self->settings.dce & IRCOMM_DSR) { |
| 1294 | seq_printf(m, "%cDSR", sep); |
| 1295 | sep = '|'; |
| 1296 | } |
| 1297 | if (self->settings.dce & IRCOMM_CD) { |
| 1298 | seq_printf(m, "%cCD", sep); |
| 1299 | sep = '|'; |
| 1300 | } |
| 1301 | if (self->settings.dce & IRCOMM_RI) { |
| 1302 | seq_printf(m, "%cRI", sep); |
| 1303 | sep = '|'; |
| 1304 | } |
| 1305 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1307 | seq_puts(m, "Configuration: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | if (!self->settings.null_modem) |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1309 | seq_puts(m, "DTE <-> DCE\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | else |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1311 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1313 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1315 | seq_puts(m, "Flow control:"); |
| 1316 | sep = ' '; |
| 1317 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { |
| 1318 | seq_printf(m, "%cXON_XOFF_IN", sep); |
| 1319 | sep = '|'; |
| 1320 | } |
| 1321 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { |
| 1322 | seq_printf(m, "%cXON_XOFF_OUT", sep); |
| 1323 | sep = '|'; |
| 1324 | } |
| 1325 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { |
| 1326 | seq_printf(m, "%cRTS_CTS_IN", sep); |
| 1327 | sep = '|'; |
| 1328 | } |
| 1329 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { |
| 1330 | seq_printf(m, "%cRTS_CTS_OUT", sep); |
| 1331 | sep = '|'; |
| 1332 | } |
| 1333 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { |
| 1334 | seq_printf(m, "%cDSR_DTR_IN", sep); |
| 1335 | sep = '|'; |
| 1336 | } |
| 1337 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { |
| 1338 | seq_printf(m, "%cDSR_DTR_OUT", sep); |
| 1339 | sep = '|'; |
| 1340 | } |
| 1341 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { |
| 1342 | seq_printf(m, "%cENQ_ACK_IN", sep); |
| 1343 | sep = '|'; |
| 1344 | } |
| 1345 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { |
| 1346 | seq_printf(m, "%cENQ_ACK_OUT", sep); |
| 1347 | sep = '|'; |
| 1348 | } |
| 1349 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1351 | seq_puts(m, "Flags:"); |
| 1352 | sep = ' '; |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1353 | if (self->port.flags & ASYNC_CTS_FLOW) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1354 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
| 1355 | sep = '|'; |
| 1356 | } |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1357 | if (self->port.flags & ASYNC_CHECK_CD) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1358 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
| 1359 | sep = '|'; |
| 1360 | } |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1361 | if (self->port.flags & ASYNC_INITIALIZED) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1362 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
| 1363 | sep = '|'; |
| 1364 | } |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1365 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1366 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
| 1367 | sep = '|'; |
| 1368 | } |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1369 | if (self->port.flags & ASYNC_CLOSING) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1370 | seq_printf(m, "%cASYNC_CLOSING", sep); |
| 1371 | sep = '|'; |
| 1372 | } |
Jiri Slaby | 849d5a9 | 2012-06-04 13:35:19 +0200 | [diff] [blame] | 1373 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1374 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
| 1375 | sep = '|'; |
| 1376 | } |
| 1377 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1379 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); |
Jiri Slaby | 580d27b | 2012-06-04 13:35:18 +0200 | [diff] [blame] | 1380 | seq_printf(m, "Open count: %d\n", self->port.count); |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1381 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
| 1382 | seq_printf(m, "Max header size: %d\n", self->max_header_size); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1383 | |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1384 | tty = tty_port_tty_get(&self->port); |
| 1385 | if (tty) { |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1386 | seq_printf(m, "Hardware: %s\n", |
Jiri Slaby | 62f228a | 2012-06-04 13:35:21 +0200 | [diff] [blame] | 1387 | tty->hw_stopped ? "Stopped" : "Running"); |
| 1388 | tty_kref_put(tty); |
| 1389 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | } |
| 1391 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1392 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | { |
| 1394 | struct ircomm_tty_cb *self; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | unsigned long flags; |
| 1396 | |
| 1397 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); |
| 1398 | |
| 1399 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1400 | while (self != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | if (self->magic != IRCOMM_TTY_MAGIC) |
| 1402 | break; |
| 1403 | |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1404 | ircomm_tty_line_info(self, m); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1406 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1408 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | } |
Alexey Dobriyan | 3d30417 | 2009-03-31 15:19:22 -0700 | [diff] [blame] | 1410 | |
| 1411 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
| 1412 | { |
| 1413 | return single_open(file, ircomm_tty_proc_show, NULL); |
| 1414 | } |
| 1415 | |
| 1416 | static const struct file_operations ircomm_tty_proc_fops = { |
| 1417 | .owner = THIS_MODULE, |
| 1418 | .open = ircomm_tty_proc_open, |
| 1419 | .read = seq_read, |
| 1420 | .llseek = seq_lseek, |
| 1421 | .release = single_release, |
| 1422 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | #endif /* CONFIG_PROC_FS */ |
| 1424 | |
| 1425 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); |
| 1426 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); |
| 1427 | MODULE_LICENSE("GPL"); |
| 1428 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); |
| 1429 | |
| 1430 | module_init(ircomm_tty_init); |
| 1431 | module_exit(ircomm_tty_cleanup); |