2007-02-12 16:52:34 +08:00
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/* This is the serial hardware link layer (HLL) for the Gigaset 307x isdn
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* DECT base (aka Sinus 45 isdn) using the RS232 DECT data module M101,
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* written as a line discipline.
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*
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* =====================================================================
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* =====================================================================
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*/
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#include "gigaset.h"
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/tty.h>
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2008-02-06 17:38:30 +08:00
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#include <linux/completion.h>
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2007-02-12 16:52:34 +08:00
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/* Version Information */
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#define DRIVER_AUTHOR "Tilman Schmidt"
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#define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101"
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#define GIGASET_MINORS 1
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#define GIGASET_MINOR 0
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#define GIGASET_MODULENAME "ser_gigaset"
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#define GIGASET_DEVNAME "ttyGS"
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/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
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#define IF_WRITEBUF 264
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_LDISC(N_GIGASET_M101);
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static int startmode = SM_ISDN;
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module_param(startmode, int, S_IRUGO);
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MODULE_PARM_DESC(startmode, "initial operation mode");
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static int cidmode = 1;
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module_param(cidmode, int, S_IRUGO);
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MODULE_PARM_DESC(cidmode, "stay in CID mode when idle");
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static struct gigaset_driver *driver;
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struct ser_cardstate {
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struct platform_device dev;
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struct tty_struct *tty;
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atomic_t refcnt;
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2008-02-06 17:38:30 +08:00
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struct completion dead_cmp;
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2007-02-12 16:52:34 +08:00
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};
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static struct platform_driver device_driver = {
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.driver = {
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.name = GIGASET_MODULENAME,
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},
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};
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static void flush_send_queue(struct cardstate *);
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/* transmit data from current open skb
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* result: number of bytes sent or error code < 0
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*/
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static int write_modem(struct cardstate *cs)
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{
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struct tty_struct *tty = cs->hw.ser->tty;
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struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
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struct sk_buff *skb = bcs->tx_skb;
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2008-04-30 15:54:13 +08:00
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int sent = -EOPNOTSUPP;
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2007-02-12 16:52:34 +08:00
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if (!tty || !tty->driver || !skb)
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2008-04-30 15:54:13 +08:00
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return -EINVAL;
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2007-02-12 16:52:34 +08:00
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if (!skb->len) {
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dev_kfree_skb_any(skb);
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bcs->tx_skb = NULL;
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return -EINVAL;
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}
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set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
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2008-04-30 15:54:13 +08:00
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if (tty->ops->write)
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sent = tty->ops->write(tty, skb->data, skb->len);
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2007-02-12 16:52:34 +08:00
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gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent);
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if (sent < 0) {
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/* error */
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flush_send_queue(cs);
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return sent;
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}
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skb_pull(skb, sent);
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if (!skb->len) {
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/* skb sent completely */
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gigaset_skb_sent(bcs, skb);
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gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
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(unsigned long) skb);
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dev_kfree_skb_any(skb);
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bcs->tx_skb = NULL;
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}
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return sent;
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}
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/*
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* transmit first queued command buffer
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* result: number of bytes sent or error code < 0
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*/
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static int send_cb(struct cardstate *cs)
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{
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struct tty_struct *tty = cs->hw.ser->tty;
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struct cmdbuf_t *cb, *tcb;
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unsigned long flags;
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int sent = 0;
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if (!tty || !tty->driver)
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return -EFAULT;
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cb = cs->cmdbuf;
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if (!cb)
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return 0; /* nothing to do */
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if (cb->len) {
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set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
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2008-04-30 15:54:13 +08:00
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sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len);
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2007-02-12 16:52:34 +08:00
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if (sent < 0) {
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/* error */
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gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent);
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flush_send_queue(cs);
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return sent;
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}
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cb->offset += sent;
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cb->len -= sent;
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gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u",
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sent, cb->len, cs->cmdbytes);
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}
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while (cb && !cb->len) {
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spin_lock_irqsave(&cs->cmdlock, flags);
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cs->cmdbytes -= cs->curlen;
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tcb = cb;
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cs->cmdbuf = cb = cb->next;
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if (cb) {
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cb->prev = NULL;
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cs->curlen = cb->len;
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} else {
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cs->lastcmdbuf = NULL;
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cs->curlen = 0;
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}
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spin_unlock_irqrestore(&cs->cmdlock, flags);
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if (tcb->wake_tasklet)
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tasklet_schedule(tcb->wake_tasklet);
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kfree(tcb);
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}
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return sent;
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}
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/*
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* send queue tasklet
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* If there is already a skb opened, put data to the transfer buffer
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* by calling "write_modem".
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* Otherwise take a new skb out of the queue.
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*/
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static void gigaset_modem_fill(unsigned long data)
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{
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struct cardstate *cs = (struct cardstate *) data;
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struct bc_state *bcs;
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int sent = 0;
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if (!cs || !(bcs = cs->bcs)) {
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gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__);
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return;
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}
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if (!bcs->tx_skb) {
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/* no skb is being sent; send command if any */
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sent = send_cb(cs);
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gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent);
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if (sent)
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/* something sent or error */
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return;
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/* no command to send; get skb */
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if (!(bcs->tx_skb = skb_dequeue(&bcs->squeue)))
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/* no skb either, nothing to do */
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return;
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gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)",
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(unsigned long) bcs->tx_skb);
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}
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/* send skb */
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gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__);
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if (write_modem(cs) < 0)
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gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__);
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}
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/*
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* throw away all data queued for sending
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*/
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static void flush_send_queue(struct cardstate *cs)
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{
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struct sk_buff *skb;
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struct cmdbuf_t *cb;
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unsigned long flags;
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/* command queue */
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spin_lock_irqsave(&cs->cmdlock, flags);
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while ((cb = cs->cmdbuf) != NULL) {
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cs->cmdbuf = cb->next;
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if (cb->wake_tasklet)
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tasklet_schedule(cb->wake_tasklet);
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kfree(cb);
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}
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cs->cmdbuf = cs->lastcmdbuf = NULL;
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cs->cmdbytes = cs->curlen = 0;
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spin_unlock_irqrestore(&cs->cmdlock, flags);
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/* data queue */
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if (cs->bcs->tx_skb)
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dev_kfree_skb_any(cs->bcs->tx_skb);
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while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL)
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dev_kfree_skb_any(skb);
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}
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/* Gigaset Driver Interface */
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/* ======================== */
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/*
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* queue an AT command string for transmission to the Gigaset device
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* parameters:
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* cs controller state structure
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* buf buffer containing the string to send
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* len number of characters to send
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* wake_tasklet tasklet to run when transmission is complete, or NULL
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* return value:
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* number of bytes queued, or error code < 0
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*/
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static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf,
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int len, struct tasklet_struct *wake_tasklet)
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{
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struct cmdbuf_t *cb;
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unsigned long flags;
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2008-02-06 17:38:28 +08:00
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gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
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2007-02-12 16:52:34 +08:00
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DEBUG_TRANSCMD : DEBUG_LOCKCMD,
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"CMD Transmit", len, buf);
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if (len <= 0)
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return 0;
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if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
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dev_err(cs->dev, "%s: out of memory!\n", __func__);
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return -ENOMEM;
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}
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memcpy(cb->buf, buf, len);
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cb->len = len;
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cb->offset = 0;
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cb->next = NULL;
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cb->wake_tasklet = wake_tasklet;
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spin_lock_irqsave(&cs->cmdlock, flags);
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cb->prev = cs->lastcmdbuf;
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if (cs->lastcmdbuf)
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cs->lastcmdbuf->next = cb;
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else {
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cs->cmdbuf = cb;
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cs->curlen = len;
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}
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cs->cmdbytes += len;
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cs->lastcmdbuf = cb;
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spin_unlock_irqrestore(&cs->cmdlock, flags);
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spin_lock_irqsave(&cs->lock, flags);
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if (cs->connected)
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tasklet_schedule(&cs->write_tasklet);
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spin_unlock_irqrestore(&cs->lock, flags);
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return len;
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}
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/*
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* tty_driver.write_room interface routine
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* return number of characters the driver will accept to be written
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* parameter:
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* controller state structure
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* return value:
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* number of characters
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*/
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static int gigaset_write_room(struct cardstate *cs)
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{
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unsigned bytes;
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bytes = cs->cmdbytes;
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return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
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}
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/*
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* tty_driver.chars_in_buffer interface routine
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* return number of characters waiting to be sent
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* parameter:
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* controller state structure
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* return value:
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* number of characters
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*/
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static int gigaset_chars_in_buffer(struct cardstate *cs)
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{
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return cs->cmdbytes;
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}
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/*
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* implementation of ioctl(GIGASET_BRKCHARS)
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* parameter:
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* controller state structure
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* return value:
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* -EINVAL (unimplemented function)
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*/
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static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
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{
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/* not implemented */
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return -EINVAL;
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}
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/*
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* Open B channel
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* Called by "do_action" in ev-layer.c
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*/
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static int gigaset_init_bchannel(struct bc_state *bcs)
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{
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/* nothing to do for M10x */
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gigaset_bchannel_up(bcs);
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return 0;
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}
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/*
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* Close B channel
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* Called by "do_action" in ev-layer.c
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*/
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static int gigaset_close_bchannel(struct bc_state *bcs)
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{
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/* nothing to do for M10x */
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gigaset_bchannel_down(bcs);
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return 0;
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}
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/*
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* Set up B channel structure
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* This is called by "gigaset_initcs" in common.c
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*/
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static int gigaset_initbcshw(struct bc_state *bcs)
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{
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/* unused */
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bcs->hw.ser = NULL;
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return 1;
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}
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/*
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* Free B channel structure
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* Called by "gigaset_freebcs" in common.c
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*/
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static int gigaset_freebcshw(struct bc_state *bcs)
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{
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/* unused */
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return 1;
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}
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/*
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* Reinitialize B channel structure
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* This is called by "bcs_reinit" in common.c
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*/
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static void gigaset_reinitbcshw(struct bc_state *bcs)
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{
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/* nothing to do for M10x */
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}
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/*
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* Free hardware specific device data
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* This will be called by "gigaset_freecs" in common.c
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*/
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static void gigaset_freecshw(struct cardstate *cs)
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{
|
|
|
|
tasklet_kill(&cs->write_tasklet);
|
|
|
|
if (!cs->hw.ser)
|
|
|
|
return;
|
|
|
|
dev_set_drvdata(&cs->hw.ser->dev.dev, NULL);
|
|
|
|
platform_device_unregister(&cs->hw.ser->dev);
|
|
|
|
kfree(cs->hw.ser);
|
|
|
|
cs->hw.ser = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gigaset_device_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct platform_device *pdev =
|
|
|
|
container_of(dev, struct platform_device, dev);
|
|
|
|
|
|
|
|
/* adapted from platform_device_release() in drivers/base/platform.c */
|
|
|
|
//FIXME is this actually necessary?
|
|
|
|
kfree(dev->platform_data);
|
|
|
|
kfree(pdev->resource);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set up hardware specific device data
|
|
|
|
* This is called by "gigaset_initcs" in common.c
|
|
|
|
*/
|
|
|
|
static int gigaset_initcshw(struct cardstate *cs)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (!(cs->hw.ser = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL))) {
|
|
|
|
err("%s: out of memory!", __func__);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
cs->hw.ser->dev.name = GIGASET_MODULENAME;
|
|
|
|
cs->hw.ser->dev.id = cs->minor_index;
|
|
|
|
cs->hw.ser->dev.dev.release = gigaset_device_release;
|
|
|
|
if ((rc = platform_device_register(&cs->hw.ser->dev)) != 0) {
|
|
|
|
err("error %d registering platform device", rc);
|
|
|
|
kfree(cs->hw.ser);
|
|
|
|
cs->hw.ser = NULL;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
dev_set_drvdata(&cs->hw.ser->dev.dev, cs);
|
|
|
|
|
|
|
|
tasklet_init(&cs->write_tasklet,
|
|
|
|
&gigaset_modem_fill, (unsigned long) cs);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* set modem control lines
|
|
|
|
* Parameters:
|
|
|
|
* card state structure
|
|
|
|
* modem control line state ([TIOCM_DTR]|[TIOCM_RTS])
|
|
|
|
* Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c
|
|
|
|
* and by "if_lock" and "if_termios" in interface.c
|
|
|
|
*/
|
|
|
|
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, unsigned new_state)
|
|
|
|
{
|
|
|
|
struct tty_struct *tty = cs->hw.ser->tty;
|
|
|
|
unsigned int set, clear;
|
|
|
|
|
2008-04-30 15:54:13 +08:00
|
|
|
if (!tty || !tty->driver || !tty->ops->tiocmset)
|
|
|
|
return -EINVAL;
|
2007-02-12 16:52:34 +08:00
|
|
|
set = new_state & ~old_state;
|
|
|
|
clear = old_state & ~new_state;
|
|
|
|
if (!set && !clear)
|
|
|
|
return 0;
|
|
|
|
gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear);
|
2008-04-30 15:54:13 +08:00
|
|
|
return tty->ops->tiocmset(tty, NULL, set, clear);
|
2007-02-12 16:52:34 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
|
|
|
|
{
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
|
|
|
|
{
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2007-03-29 16:20:34 +08:00
|
|
|
static const struct gigaset_ops ops = {
|
2007-02-12 16:52:34 +08:00
|
|
|
gigaset_write_cmd,
|
|
|
|
gigaset_write_room,
|
|
|
|
gigaset_chars_in_buffer,
|
|
|
|
gigaset_brkchars,
|
|
|
|
gigaset_init_bchannel,
|
|
|
|
gigaset_close_bchannel,
|
|
|
|
gigaset_initbcshw,
|
|
|
|
gigaset_freebcshw,
|
|
|
|
gigaset_reinitbcshw,
|
|
|
|
gigaset_initcshw,
|
|
|
|
gigaset_freecshw,
|
|
|
|
gigaset_set_modem_ctrl,
|
|
|
|
gigaset_baud_rate,
|
|
|
|
gigaset_set_line_ctrl,
|
|
|
|
gigaset_m10x_send_skb, /* asyncdata.c */
|
|
|
|
gigaset_m10x_input, /* asyncdata.c */
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/* Line Discipline Interface */
|
|
|
|
/* ========================= */
|
|
|
|
|
|
|
|
/* helper functions for cardstate refcounting */
|
|
|
|
static struct cardstate *cs_get(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cardstate *cs = tty->disc_data;
|
|
|
|
|
|
|
|
if (!cs || !cs->hw.ser) {
|
|
|
|
gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
atomic_inc(&cs->hw.ser->refcnt);
|
|
|
|
return cs;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void cs_put(struct cardstate *cs)
|
|
|
|
{
|
|
|
|
if (atomic_dec_and_test(&cs->hw.ser->refcnt))
|
2008-02-06 17:38:30 +08:00
|
|
|
complete(&cs->hw.ser->dead_cmp);
|
2007-02-12 16:52:34 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the tty driver when the line discipline is pushed onto the tty.
|
|
|
|
* Called in process context.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
gigaset_tty_open(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cardstate *cs;
|
|
|
|
|
|
|
|
gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101");
|
|
|
|
|
2008-11-30 13:38:28 +08:00
|
|
|
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
|
2007-02-12 16:52:34 +08:00
|
|
|
|
|
|
|
if (!driver) {
|
|
|
|
err("%s: no driver structure", __func__);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allocate memory for our device state and intialize it */
|
|
|
|
if (!(cs = gigaset_initcs(driver, 1, 1, 0, cidmode,
|
|
|
|
GIGASET_MODULENAME)))
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
cs->dev = &cs->hw.ser->dev.dev;
|
|
|
|
cs->hw.ser->tty = tty;
|
|
|
|
atomic_set(&cs->hw.ser->refcnt, 1);
|
2008-02-06 17:38:30 +08:00
|
|
|
init_completion(&cs->hw.ser->dead_cmp);
|
2007-02-12 16:52:34 +08:00
|
|
|
|
|
|
|
tty->disc_data = cs;
|
|
|
|
|
|
|
|
/* OK.. Initialization of the datastructures and the HW is done.. Now
|
|
|
|
* startup system and notify the LL that we are ready to run
|
|
|
|
*/
|
|
|
|
if (startmode == SM_LOCKED)
|
2008-02-06 17:38:28 +08:00
|
|
|
cs->mstate = MS_LOCKED;
|
2007-02-12 16:52:34 +08:00
|
|
|
if (!gigaset_start(cs)) {
|
|
|
|
tasklet_kill(&cs->write_tasklet);
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
gig_dbg(DEBUG_INIT, "Startup of HLL done");
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error:
|
|
|
|
gig_dbg(DEBUG_INIT, "Startup of HLL failed");
|
|
|
|
tty->disc_data = NULL;
|
|
|
|
gigaset_freecs(cs);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the tty driver when the line discipline is removed.
|
|
|
|
* Called from process context.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
gigaset_tty_close(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cardstate *cs = tty->disc_data;
|
|
|
|
|
|
|
|
gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101");
|
|
|
|
|
|
|
|
if (!cs) {
|
|
|
|
gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* prevent other callers from entering ldisc methods */
|
|
|
|
tty->disc_data = NULL;
|
|
|
|
|
|
|
|
if (!cs->hw.ser)
|
|
|
|
err("%s: no hw cardstate", __func__);
|
|
|
|
else {
|
|
|
|
/* wait for running methods to finish */
|
|
|
|
if (!atomic_dec_and_test(&cs->hw.ser->refcnt))
|
2008-02-06 17:38:30 +08:00
|
|
|
wait_for_completion(&cs->hw.ser->dead_cmp);
|
2007-02-12 16:52:34 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* stop operations */
|
|
|
|
gigaset_stop(cs);
|
|
|
|
tasklet_kill(&cs->write_tasklet);
|
|
|
|
flush_send_queue(cs);
|
|
|
|
cs->dev = NULL;
|
|
|
|
gigaset_freecs(cs);
|
|
|
|
|
|
|
|
gig_dbg(DEBUG_INIT, "Shutdown of HLL done");
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the tty driver when the tty line is hung up.
|
|
|
|
* Wait for I/O to driver to complete and unregister ISDN device.
|
|
|
|
* This is already done by the close routine, so just call that.
|
|
|
|
* Called from process context.
|
|
|
|
*/
|
|
|
|
static int gigaset_tty_hangup(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
gigaset_tty_close(tty);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Read on the tty.
|
|
|
|
* Unused, received data goes only to the Gigaset driver.
|
|
|
|
*/
|
|
|
|
static ssize_t
|
|
|
|
gigaset_tty_read(struct tty_struct *tty, struct file *file,
|
|
|
|
unsigned char __user *buf, size_t count)
|
|
|
|
{
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Write on the tty.
|
|
|
|
* Unused, transmit data comes only from the Gigaset driver.
|
|
|
|
*/
|
|
|
|
static ssize_t
|
|
|
|
gigaset_tty_write(struct tty_struct *tty, struct file *file,
|
|
|
|
const unsigned char *buf, size_t count)
|
|
|
|
{
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ioctl on the tty.
|
|
|
|
* Called in process context only.
|
|
|
|
* May be re-entered by multiple ioctl calling threads.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
gigaset_tty_ioctl(struct tty_struct *tty, struct file *file,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct cardstate *cs = cs_get(tty);
|
|
|
|
int rc, val;
|
|
|
|
int __user *p = (int __user *)arg;
|
|
|
|
|
|
|
|
if (!cs)
|
|
|
|
return -ENXIO;
|
|
|
|
|
|
|
|
switch (cmd) {
|
2008-10-13 17:44:43 +08:00
|
|
|
|
|
|
|
case FIONREAD:
|
|
|
|
/* unused, always return zero */
|
|
|
|
val = 0;
|
|
|
|
rc = put_user(val, p);
|
2007-02-12 16:52:34 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case TCFLSH:
|
|
|
|
/* flush our buffers and the serial port's buffer */
|
|
|
|
switch (arg) {
|
|
|
|
case TCIFLUSH:
|
|
|
|
/* no own input buffer to flush */
|
|
|
|
break;
|
|
|
|
case TCIOFLUSH:
|
|
|
|
case TCOFLUSH:
|
|
|
|
flush_send_queue(cs);
|
|
|
|
break;
|
|
|
|
}
|
2008-10-13 17:44:43 +08:00
|
|
|
/* Pass through */
|
2007-02-12 16:52:34 +08:00
|
|
|
|
|
|
|
default:
|
2008-10-13 17:44:43 +08:00
|
|
|
/* pass through to underlying serial device */
|
|
|
|
rc = n_tty_ioctl_helper(tty, file, cmd, arg);
|
|
|
|
break;
|
2007-02-12 16:52:34 +08:00
|
|
|
}
|
|
|
|
cs_put(cs);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the tty driver when a block of data has been received.
|
|
|
|
* Will not be re-entered while running but other ldisc functions
|
|
|
|
* may be called in parallel.
|
|
|
|
* Can be called from hard interrupt level as well as soft interrupt
|
|
|
|
* level or mainline.
|
|
|
|
* Parameters:
|
|
|
|
* tty tty structure
|
|
|
|
* buf buffer containing received characters
|
|
|
|
* cflags buffer containing error flags for received characters (ignored)
|
|
|
|
* count number of received characters
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf,
|
|
|
|
char *cflags, int count)
|
|
|
|
{
|
|
|
|
struct cardstate *cs = cs_get(tty);
|
|
|
|
unsigned tail, head, n;
|
|
|
|
struct inbuf_t *inbuf;
|
|
|
|
|
|
|
|
if (!cs)
|
|
|
|
return;
|
|
|
|
if (!(inbuf = cs->inbuf)) {
|
|
|
|
dev_err(cs->dev, "%s: no inbuf\n", __func__);
|
|
|
|
cs_put(cs);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2008-02-06 17:38:28 +08:00
|
|
|
tail = inbuf->tail;
|
|
|
|
head = inbuf->head;
|
2007-02-12 16:52:34 +08:00
|
|
|
gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes",
|
|
|
|
head, tail, count);
|
|
|
|
|
|
|
|
if (head <= tail) {
|
|
|
|
/* possible buffer wraparound */
|
|
|
|
n = min_t(unsigned, count, RBUFSIZE - tail);
|
|
|
|
memcpy(inbuf->data + tail, buf, n);
|
|
|
|
tail = (tail + n) % RBUFSIZE;
|
|
|
|
buf += n;
|
|
|
|
count -= n;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (count > 0) {
|
|
|
|
/* tail < head and some data left */
|
|
|
|
n = head - tail - 1;
|
|
|
|
if (count > n) {
|
|
|
|
dev_err(cs->dev,
|
|
|
|
"inbuf overflow, discarding %d bytes\n",
|
|
|
|
count - n);
|
|
|
|
count = n;
|
|
|
|
}
|
|
|
|
memcpy(inbuf->data + tail, buf, count);
|
|
|
|
tail += count;
|
|
|
|
}
|
|
|
|
|
|
|
|
gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
|
2008-02-06 17:38:28 +08:00
|
|
|
inbuf->tail = tail;
|
2007-02-12 16:52:34 +08:00
|
|
|
|
|
|
|
/* Everything was received .. Push data into handler */
|
|
|
|
gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
|
|
|
|
gigaset_schedule_event(cs);
|
|
|
|
cs_put(cs);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the tty driver when there's room for more data to send.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
gigaset_tty_wakeup(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cardstate *cs = cs_get(tty);
|
|
|
|
|
|
|
|
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
|
|
|
|
if (!cs)
|
|
|
|
return;
|
|
|
|
tasklet_schedule(&cs->write_tasklet);
|
|
|
|
cs_put(cs);
|
|
|
|
}
|
|
|
|
|
2008-07-17 04:53:12 +08:00
|
|
|
static struct tty_ldisc_ops gigaset_ldisc = {
|
2007-02-12 16:52:34 +08:00
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.owner = THIS_MODULE,
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.magic = TTY_LDISC_MAGIC,
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.name = "ser_gigaset",
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.open = gigaset_tty_open,
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.close = gigaset_tty_close,
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.hangup = gigaset_tty_hangup,
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.read = gigaset_tty_read,
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.write = gigaset_tty_write,
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.ioctl = gigaset_tty_ioctl,
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.receive_buf = gigaset_tty_receive,
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.write_wakeup = gigaset_tty_wakeup,
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};
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/* Initialization / Shutdown */
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/* ========================= */
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static int __init ser_gigaset_init(void)
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{
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int rc;
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gig_dbg(DEBUG_INIT, "%s", __func__);
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if ((rc = platform_driver_register(&device_driver)) != 0) {
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err("error %d registering platform driver", rc);
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return rc;
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}
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/* allocate memory for our driver state and intialize it */
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if (!(driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
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GIGASET_MODULENAME, GIGASET_DEVNAME,
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&ops, THIS_MODULE)))
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goto error;
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if ((rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc)) != 0) {
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err("error %d registering line discipline", rc);
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goto error;
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}
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return 0;
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error:
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if (driver) {
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gigaset_freedriver(driver);
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driver = NULL;
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}
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platform_driver_unregister(&device_driver);
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return rc;
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}
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static void __exit ser_gigaset_exit(void)
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{
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int rc;
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gig_dbg(DEBUG_INIT, "%s", __func__);
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if (driver) {
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gigaset_freedriver(driver);
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driver = NULL;
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}
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if ((rc = tty_unregister_ldisc(N_GIGASET_M101)) != 0)
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err("error %d unregistering line discipline", rc);
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platform_driver_unregister(&device_driver);
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}
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module_init(ser_gigaset_init);
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module_exit(ser_gigaset_exit);
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