| /* This is the serial hardware link layer (HLL) for the Gigaset 307x isdn |
| * DECT base (aka Sinus 45 isdn) using the RS232 DECT data module M101, |
| * written as a line discipline. |
| * |
| * ===================================================================== |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * ===================================================================== |
| */ |
| |
| #include "gigaset.h" |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/platform_device.h> |
| #include <linux/completion.h> |
| |
| /* Version Information */ |
| #define DRIVER_AUTHOR "Tilman Schmidt" |
| #define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101" |
| |
| #define GIGASET_MINORS 1 |
| #define GIGASET_MINOR 0 |
| #define GIGASET_MODULENAME "ser_gigaset" |
| #define GIGASET_DEVNAME "ttyGS" |
| |
| /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */ |
| #define IF_WRITEBUF 264 |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_LDISC(N_GIGASET_M101); |
| |
| static int startmode = SM_ISDN; |
| module_param(startmode, int, S_IRUGO); |
| MODULE_PARM_DESC(startmode, "initial operation mode"); |
| static int cidmode = 1; |
| module_param(cidmode, int, S_IRUGO); |
| MODULE_PARM_DESC(cidmode, "stay in CID mode when idle"); |
| |
| static struct gigaset_driver *driver; |
| |
| struct ser_cardstate { |
| struct platform_device dev; |
| struct tty_struct *tty; |
| atomic_t refcnt; |
| struct completion dead_cmp; |
| }; |
| |
| static struct platform_driver device_driver = { |
| .driver = { |
| .name = GIGASET_MODULENAME, |
| }, |
| }; |
| |
| static void flush_send_queue(struct cardstate *); |
| |
| /* transmit data from current open skb |
| * result: number of bytes sent or error code < 0 |
| */ |
| static int write_modem(struct cardstate *cs) |
| { |
| struct tty_struct *tty = cs->hw.ser->tty; |
| struct bc_state *bcs = &cs->bcs[0]; /* only one channel */ |
| struct sk_buff *skb = bcs->tx_skb; |
| int sent = -EOPNOTSUPP; |
| |
| if (!tty || !tty->driver || !skb) |
| return -EINVAL; |
| |
| if (!skb->len) { |
| dev_kfree_skb_any(skb); |
| bcs->tx_skb = NULL; |
| return -EINVAL; |
| } |
| |
| set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
| if (tty->ops->write) |
| sent = tty->ops->write(tty, skb->data, skb->len); |
| gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent); |
| if (sent < 0) { |
| /* error */ |
| flush_send_queue(cs); |
| return sent; |
| } |
| skb_pull(skb, sent); |
| if (!skb->len) { |
| /* skb sent completely */ |
| gigaset_skb_sent(bcs, skb); |
| |
| gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!", |
| (unsigned long) skb); |
| dev_kfree_skb_any(skb); |
| bcs->tx_skb = NULL; |
| } |
| return sent; |
| } |
| |
| /* |
| * transmit first queued command buffer |
| * result: number of bytes sent or error code < 0 |
| */ |
| static int send_cb(struct cardstate *cs) |
| { |
| struct tty_struct *tty = cs->hw.ser->tty; |
| struct cmdbuf_t *cb, *tcb; |
| unsigned long flags; |
| int sent = 0; |
| |
| if (!tty || !tty->driver) |
| return -EFAULT; |
| |
| cb = cs->cmdbuf; |
| if (!cb) |
| return 0; /* nothing to do */ |
| |
| if (cb->len) { |
| set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
| sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len); |
| if (sent < 0) { |
| /* error */ |
| gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent); |
| flush_send_queue(cs); |
| return sent; |
| } |
| cb->offset += sent; |
| cb->len -= sent; |
| gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u", |
| sent, cb->len, cs->cmdbytes); |
| } |
| |
| while (cb && !cb->len) { |
| spin_lock_irqsave(&cs->cmdlock, flags); |
| cs->cmdbytes -= cs->curlen; |
| tcb = cb; |
| cs->cmdbuf = cb = cb->next; |
| if (cb) { |
| cb->prev = NULL; |
| cs->curlen = cb->len; |
| } else { |
| cs->lastcmdbuf = NULL; |
| cs->curlen = 0; |
| } |
| spin_unlock_irqrestore(&cs->cmdlock, flags); |
| |
| if (tcb->wake_tasklet) |
| tasklet_schedule(tcb->wake_tasklet); |
| kfree(tcb); |
| } |
| return sent; |
| } |
| |
| /* |
| * send queue tasklet |
| * If there is already a skb opened, put data to the transfer buffer |
| * by calling "write_modem". |
| * Otherwise take a new skb out of the queue. |
| */ |
| static void gigaset_modem_fill(unsigned long data) |
| { |
| struct cardstate *cs = (struct cardstate *) data; |
| struct bc_state *bcs; |
| struct sk_buff *nextskb; |
| int sent = 0; |
| |
| if (!cs) { |
| gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); |
| return; |
| } |
| bcs = cs->bcs; |
| if (!bcs) { |
| gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); |
| return; |
| } |
| if (!bcs->tx_skb) { |
| /* no skb is being sent; send command if any */ |
| sent = send_cb(cs); |
| gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); |
| if (sent) |
| /* something sent or error */ |
| return; |
| |
| /* no command to send; get skb */ |
| nextskb = skb_dequeue(&bcs->squeue); |
| if (!nextskb) |
| /* no skb either, nothing to do */ |
| return; |
| bcs->tx_skb = nextskb; |
| |
| gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", |
| (unsigned long) bcs->tx_skb); |
| } |
| |
| /* send skb */ |
| gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); |
| if (write_modem(cs) < 0) |
| gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); |
| } |
| |
| /* |
| * throw away all data queued for sending |
| */ |
| static void flush_send_queue(struct cardstate *cs) |
| { |
| struct sk_buff *skb; |
| struct cmdbuf_t *cb; |
| unsigned long flags; |
| |
| /* command queue */ |
| spin_lock_irqsave(&cs->cmdlock, flags); |
| while ((cb = cs->cmdbuf) != NULL) { |
| cs->cmdbuf = cb->next; |
| if (cb->wake_tasklet) |
| tasklet_schedule(cb->wake_tasklet); |
| kfree(cb); |
| } |
| cs->cmdbuf = cs->lastcmdbuf = NULL; |
| cs->cmdbytes = cs->curlen = 0; |
| spin_unlock_irqrestore(&cs->cmdlock, flags); |
| |
| /* data queue */ |
| if (cs->bcs->tx_skb) |
| dev_kfree_skb_any(cs->bcs->tx_skb); |
| while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) |
| dev_kfree_skb_any(skb); |
| } |
| |
| |
| /* Gigaset Driver Interface */ |
| /* ======================== */ |
| |
| /* |
| * queue an AT command string for transmission to the Gigaset device |
| * parameters: |
| * cs controller state structure |
| * buf buffer containing the string to send |
| * len number of characters to send |
| * wake_tasklet tasklet to run when transmission is complete, or NULL |
| * return value: |
| * number of bytes queued, or error code < 0 |
| */ |
| static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, |
| int len, struct tasklet_struct *wake_tasklet) |
| { |
| struct cmdbuf_t *cb; |
| unsigned long flags; |
| |
| gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
| DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
| "CMD Transmit", len, buf); |
| |
| if (len <= 0) |
| return 0; |
| |
| cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC); |
| if (!cb) { |
| dev_err(cs->dev, "%s: out of memory!\n", __func__); |
| return -ENOMEM; |
| } |
| |
| memcpy(cb->buf, buf, len); |
| cb->len = len; |
| cb->offset = 0; |
| cb->next = NULL; |
| cb->wake_tasklet = wake_tasklet; |
| |
| spin_lock_irqsave(&cs->cmdlock, flags); |
| cb->prev = cs->lastcmdbuf; |
| if (cs->lastcmdbuf) |
| cs->lastcmdbuf->next = cb; |
| else { |
| cs->cmdbuf = cb; |
| cs->curlen = len; |
| } |
| cs->cmdbytes += len; |
| cs->lastcmdbuf = cb; |
| spin_unlock_irqrestore(&cs->cmdlock, flags); |
| |
| spin_lock_irqsave(&cs->lock, flags); |
| if (cs->connected) |
| tasklet_schedule(&cs->write_tasklet); |
| spin_unlock_irqrestore(&cs->lock, flags); |
| return len; |
| } |
| |
| /* |
| * tty_driver.write_room interface routine |
| * return number of characters the driver will accept to be written |
| * parameter: |
| * controller state structure |
| * return value: |
| * number of characters |
| */ |
| static int gigaset_write_room(struct cardstate *cs) |
| { |
| unsigned bytes; |
| |
| bytes = cs->cmdbytes; |
| return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; |
| } |
| |
| /* |
| * tty_driver.chars_in_buffer interface routine |
| * return number of characters waiting to be sent |
| * parameter: |
| * controller state structure |
| * return value: |
| * number of characters |
| */ |
| static int gigaset_chars_in_buffer(struct cardstate *cs) |
| { |
| return cs->cmdbytes; |
| } |
| |
| /* |
| * implementation of ioctl(GIGASET_BRKCHARS) |
| * parameter: |
| * controller state structure |
| * return value: |
| * -EINVAL (unimplemented function) |
| */ |
| static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) |
| { |
| /* not implemented */ |
| return -EINVAL; |
| } |
| |
| /* |
| * Open B channel |
| * Called by "do_action" in ev-layer.c |
| */ |
| static int gigaset_init_bchannel(struct bc_state *bcs) |
| { |
| /* nothing to do for M10x */ |
| gigaset_bchannel_up(bcs); |
| return 0; |
| } |
| |
| /* |
| * Close B channel |
| * Called by "do_action" in ev-layer.c |
| */ |
| static int gigaset_close_bchannel(struct bc_state *bcs) |
| { |
| /* nothing to do for M10x */ |
| gigaset_bchannel_down(bcs); |
| return 0; |
| } |
| |
| /* |
| * Set up B channel structure |
| * This is called by "gigaset_initcs" in common.c |
| */ |
| static int gigaset_initbcshw(struct bc_state *bcs) |
| { |
| /* unused */ |
| bcs->hw.ser = NULL; |
| return 1; |
| } |
| |
| /* |
| * Free B channel structure |
| * Called by "gigaset_freebcs" in common.c |
| */ |
| static int gigaset_freebcshw(struct bc_state *bcs) |
| { |
| /* unused */ |
| return 1; |
| } |
| |
| /* |
| * Reinitialize B channel structure |
| * This is called by "bcs_reinit" in common.c |
| */ |
| static void gigaset_reinitbcshw(struct bc_state *bcs) |
| { |
| /* nothing to do for M10x */ |
| } |
| |
| /* |
| * Free hardware specific device data |
| * This will be called by "gigaset_freecs" in common.c |
| */ |
| static void gigaset_freecshw(struct cardstate *cs) |
| { |
| 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 = to_platform_device(dev); |
| |
| /* adapted from platform_device_release() in drivers/base/platform.c */ |
| 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; |
| struct ser_cardstate *scs; |
| |
| scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL); |
| if (!scs) { |
| pr_err("out of memory\n"); |
| return 0; |
| } |
| cs->hw.ser = scs; |
| |
| cs->hw.ser->dev.name = GIGASET_MODULENAME; |
| cs->hw.ser->dev.id = cs->minor_index; |
| cs->hw.ser->dev.dev.release = gigaset_device_release; |
| rc = platform_device_register(&cs->hw.ser->dev); |
| if (rc != 0) { |
| pr_err("error %d registering platform device\n", 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; |
| |
| if (!tty || !tty->driver || !tty->ops->tiocmset) |
| return -EINVAL; |
| 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); |
| return tty->ops->tiocmset(tty, NULL, set, clear); |
| } |
| |
| 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; |
| } |
| |
| static const struct gigaset_ops ops = { |
| 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)) |
| complete(&cs->hw.ser->dead_cmp); |
| } |
| |
| /* |
| * 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"); |
| |
| pr_info(DRIVER_DESC "\n"); |
| |
| if (!driver) { |
| pr_err("%s: no driver structure\n", __func__); |
| return -ENODEV; |
| } |
| |
| /* allocate memory for our device state and intialize it */ |
| cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME); |
| if (!cs) |
| goto error; |
| |
| cs->dev = &cs->hw.ser->dev.dev; |
| cs->hw.ser->tty = tty; |
| atomic_set(&cs->hw.ser->refcnt, 1); |
| init_completion(&cs->hw.ser->dead_cmp); |
| |
| 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) |
| cs->mstate = MS_LOCKED; |
| 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) |
| pr_err("%s: no hw cardstate\n", __func__); |
| else { |
| /* wait for running methods to finish */ |
| if (!atomic_dec_and_test(&cs->hw.ser->refcnt)) |
| wait_for_completion(&cs->hw.ser->dead_cmp); |
| } |
| |
| /* 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) { |
| |
| case FIONREAD: |
| /* unused, always return zero */ |
| val = 0; |
| rc = put_user(val, p); |
| 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; |
| } |
| /* Pass through */ |
| |
| default: |
| /* pass through to underlying serial device */ |
| rc = n_tty_ioctl_helper(tty, file, cmd, arg); |
| break; |
| } |
| 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; |
| inbuf = cs->inbuf; |
| if (!inbuf) { |
| dev_err(cs->dev, "%s: no inbuf\n", __func__); |
| cs_put(cs); |
| return; |
| } |
| |
| tail = inbuf->tail; |
| head = inbuf->head; |
| 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); |
| inbuf->tail = tail; |
| |
| /* 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); |
| } |
| |
| static struct tty_ldisc_ops gigaset_ldisc = { |
| .owner = THIS_MODULE, |
| .magic = TTY_LDISC_MAGIC, |
| .name = "ser_gigaset", |
| .open = gigaset_tty_open, |
| .close = gigaset_tty_close, |
| .hangup = gigaset_tty_hangup, |
| .read = gigaset_tty_read, |
| .write = gigaset_tty_write, |
| .ioctl = gigaset_tty_ioctl, |
| .receive_buf = gigaset_tty_receive, |
| .write_wakeup = gigaset_tty_wakeup, |
| }; |
| |
| |
| /* Initialization / Shutdown */ |
| /* ========================= */ |
| |
| static int __init ser_gigaset_init(void) |
| { |
| int rc; |
| |
| gig_dbg(DEBUG_INIT, "%s", __func__); |
| rc = platform_driver_register(&device_driver); |
| if (rc != 0) { |
| pr_err("error %d registering platform driver\n", rc); |
| return rc; |
| } |
| |
| /* allocate memory for our driver state and intialize it */ |
| driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS, |
| GIGASET_MODULENAME, GIGASET_DEVNAME, |
| &ops, THIS_MODULE); |
| if (!driver) |
| goto error; |
| |
| rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc); |
| if (rc != 0) { |
| pr_err("error %d registering line discipline\n", rc); |
| goto error; |
| } |
| |
| return 0; |
| |
| error: |
| if (driver) { |
| gigaset_freedriver(driver); |
| driver = NULL; |
| } |
| platform_driver_unregister(&device_driver); |
| return rc; |
| } |
| |
| static void __exit ser_gigaset_exit(void) |
| { |
| int rc; |
| |
| gig_dbg(DEBUG_INIT, "%s", __func__); |
| |
| if (driver) { |
| gigaset_freedriver(driver); |
| driver = NULL; |
| } |
| |
| rc = tty_unregister_ldisc(N_GIGASET_M101); |
| if (rc != 0) |
| pr_err("error %d unregistering line discipline\n", rc); |
| |
| platform_driver_unregister(&device_driver); |
| } |
| |
| module_init(ser_gigaset_init); |
| module_exit(ser_gigaset_exit); |