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linux/drivers/isdn/gigaset/bas-gigaset.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* USB driver for Gigaset 307x base via direct USB connection.
*
* Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
* Tilman Schmidt <tilman@imap.cc>,
* Stefan Eilers.
*
* =====================================================================
* =====================================================================
*/
#include "gigaset.h"
#include <linux/usb.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
/* Version Information */
#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
#define DRIVER_DESC "USB Driver for Gigaset 307x"
/* Module parameters */
static int startmode = SM_ISDN;
static int cidmode = 1;
module_param(startmode, int, S_IRUGO);
module_param(cidmode, int, S_IRUGO);
MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
MODULE_PARM_DESC(cidmode, "Call-ID mode");
#define GIGASET_MINORS 1
#define GIGASET_MINOR 16
#define GIGASET_MODULENAME "bas_gigaset"
#define GIGASET_DEVNAME "ttyGB"
/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
#define IF_WRITEBUF 264
/* interrupt pipe message size according to ibid. ch. 2.2 */
#define IP_MSGSIZE 3
/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID 0x0681
#define USB_3070_PRODUCT_ID 0x0001
#define USB_3075_PRODUCT_ID 0x0002
#define USB_SX303_PRODUCT_ID 0x0021
#define USB_SX353_PRODUCT_ID 0x0022
/* table of devices that work with this driver */
static const struct usb_device_id gigaset_table[] = {
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, gigaset_table);
/*======================= local function prototypes ==========================*/
/* function called if a new device belonging to this driver is connected */
static int gigaset_probe(struct usb_interface *interface,
const struct usb_device_id *id);
/* Function will be called if the device is unplugged */
static void gigaset_disconnect(struct usb_interface *interface);
/* functions called before/after suspend */
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
static int gigaset_resume(struct usb_interface *intf);
/* functions called before/after device reset */
static int gigaset_pre_reset(struct usb_interface *intf);
static int gigaset_post_reset(struct usb_interface *intf);
static int atread_submit(struct cardstate *, int);
static void stopurbs(struct bas_bc_state *);
static int req_submit(struct bc_state *, int, int, int);
static int atwrite_submit(struct cardstate *, unsigned char *, int);
static int start_cbsend(struct cardstate *);
/*============================================================================*/
struct bas_cardstate {
struct usb_device *udev; /* USB device pointer */
struct cardstate *cs;
struct usb_interface *interface; /* interface for this device */
unsigned char minor; /* starting minor number */
struct urb *urb_ctrl; /* control pipe default URB */
struct usb_ctrlrequest dr_ctrl;
struct timer_list timer_ctrl; /* control request timeout */
int retry_ctrl;
struct timer_list timer_atrdy; /* AT command ready timeout */
struct urb *urb_cmd_out; /* for sending AT commands */
struct usb_ctrlrequest dr_cmd_out;
int retry_cmd_out;
struct urb *urb_cmd_in; /* for receiving AT replies */
struct usb_ctrlrequest dr_cmd_in;
struct timer_list timer_cmd_in; /* receive request timeout */
unsigned char *rcvbuf; /* AT reply receive buffer */
struct urb *urb_int_in; /* URB for interrupt pipe */
unsigned char *int_in_buf;
struct work_struct int_in_wq; /* for usb_clear_halt() */
struct timer_list timer_int_in; /* int read retry delay */
int retry_int_in;
spinlock_t lock; /* locks all following */
int basstate; /* bitmap (BS_*) */
int pending; /* uncompleted base request */
wait_queue_head_t waitqueue;
int rcvbuf_size; /* size of AT receive buffer */
/* 0: no receive in progress */
int retry_cmd_in; /* receive req retry count */
};
/* status of direct USB connection to 307x base (bits in basstate) */
#define BS_ATOPEN 0x001 /* AT channel open */
#define BS_B1OPEN 0x002 /* B channel 1 open */
#define BS_B2OPEN 0x004 /* B channel 2 open */
#define BS_ATREADY 0x008 /* base ready for AT command */
#define BS_INIT 0x010 /* base has signalled INIT_OK */
#define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
#define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
#define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
#define BS_SUSPEND 0x100 /* USB port suspended */
#define BS_RESETTING 0x200 /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
static struct gigaset_driver *driver;
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver gigaset_usb_driver = {
.name = GIGASET_MODULENAME,
.probe = gigaset_probe,
.disconnect = gigaset_disconnect,
.id_table = gigaset_table,
.suspend = gigaset_suspend,
.resume = gigaset_resume,
.reset_resume = gigaset_post_reset,
.pre_reset = gigaset_pre_reset,
.post_reset = gigaset_post_reset,
.disable_hub_initiated_lpm = 1,
};
/* get message text for usb_submit_urb return code
*/
static char *get_usb_rcmsg(int rc)
{
static char unkmsg[28];
switch (rc) {
case 0:
return "success";
case -ENOMEM:
return "out of memory";
case -ENODEV:
return "device not present";
case -ENOENT:
return "endpoint not present";
case -ENXIO:
return "URB type not supported";
case -EINVAL:
return "invalid argument";
case -EAGAIN:
return "start frame too early or too much scheduled";
case -EFBIG:
return "too many isoc frames requested";
case -EPIPE:
return "endpoint stalled";
case -EMSGSIZE:
return "invalid packet size";
case -ENOSPC:
return "would overcommit USB bandwidth";
case -ESHUTDOWN:
return "device shut down";
case -EPERM:
return "reject flag set";
case -EHOSTUNREACH:
return "device suspended";
default:
snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
return unkmsg;
}
}
/* get message text for USB status code
*/
static char *get_usb_statmsg(int status)
{
static char unkmsg[28];
switch (status) {
case 0:
return "success";
case -ENOENT:
return "unlinked (sync)";
case -EINPROGRESS:
return "URB still pending";
case -EPROTO:
return "bitstuff error, timeout, or unknown USB error";
case -EILSEQ:
return "CRC mismatch, timeout, or unknown USB error";
case -ETIME:
return "USB response timeout";
case -EPIPE:
return "endpoint stalled";
case -ECOMM:
return "IN buffer overrun";
case -ENOSR:
return "OUT buffer underrun";
case -EOVERFLOW:
return "endpoint babble";
case -EREMOTEIO:
return "short packet";
case -ENODEV:
return "device removed";
case -EXDEV:
return "partial isoc transfer";
case -EINVAL:
return "ISO madness";
case -ECONNRESET:
return "unlinked (async)";
case -ESHUTDOWN:
return "device shut down";
default:
snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
return unkmsg;
}
}
/* usb_pipetype_str
* retrieve string representation of USB pipe type
*/
static inline char *usb_pipetype_str(int pipe)
{
if (usb_pipeisoc(pipe))
return "Isoc";
if (usb_pipeint(pipe))
return "Int";
if (usb_pipecontrol(pipe))
return "Ctrl";
if (usb_pipebulk(pipe))
return "Bulk";
return "?";
}
/* dump_urb
* write content of URB to syslog for debugging
*/
static inline void dump_urb(enum debuglevel level, const char *tag,
struct urb *urb)
{
#ifdef CONFIG_GIGASET_DEBUG
int i;
gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
if (urb) {
gig_dbg(level,
" dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
"hcpriv=0x%08lx, transfer_flags=0x%x,",
(unsigned long) urb->dev,
usb_pipetype_str(urb->pipe),
usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
(unsigned long) urb->hcpriv,
urb->transfer_flags);
gig_dbg(level,
" transfer_buffer=0x%08lx[%d], actual_length=%d, "
"setup_packet=0x%08lx,",
(unsigned long) urb->transfer_buffer,
urb->transfer_buffer_length, urb->actual_length,
(unsigned long) urb->setup_packet);
gig_dbg(level,
" start_frame=%d, number_of_packets=%d, interval=%d, "
"error_count=%d,",
urb->start_frame, urb->number_of_packets, urb->interval,
urb->error_count);
gig_dbg(level,
" context=0x%08lx, complete=0x%08lx, "
"iso_frame_desc[]={",
(unsigned long) urb->context,
(unsigned long) urb->complete);
for (i = 0; i < urb->number_of_packets; i++) {
struct usb_iso_packet_descriptor *pifd
= &urb->iso_frame_desc[i];
gig_dbg(level,
" {offset=%u, length=%u, actual_length=%u, "
"status=%u}",
pifd->offset, pifd->length, pifd->actual_length,
pifd->status);
}
}
gig_dbg(level, "}}");
#endif
}
/* read/set modem control bits etc. (m10x only) */
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
unsigned new_state)
{
return -EINVAL;
}
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;
}
/* set/clear bits in base connection state, return previous state
*/
static inline int update_basstate(struct bas_cardstate *ucs,
int set, int clear)
{
unsigned long flags;
int state;
spin_lock_irqsave(&ucs->lock, flags);
state = ucs->basstate;
ucs->basstate = (state & ~clear) | set;
spin_unlock_irqrestore(&ucs->lock, flags);
return state;
}
/* error_hangup
* hang up any existing connection because of an unrecoverable error
* This function may be called from any context and takes care of scheduling
* the necessary actions for execution outside of interrupt context.
* cs->lock must not be held.
* argument:
* B channel control structure
*/
static inline void error_hangup(struct bc_state *bcs)
{
struct cardstate *cs = bcs->cs;
gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
gigaset_schedule_event(cs);
}
/* error_reset
* reset Gigaset device because of an unrecoverable error
* This function may be called from any context, and takes care of
* scheduling the necessary actions for execution outside of interrupt context.
* cs->hw.bas->lock must not be held.
* argument:
* controller state structure
*/
static inline void error_reset(struct cardstate *cs)
{
/* reset interrupt pipe to recover (ignore errors) */
update_basstate(cs->hw.bas, BS_RESETTING, 0);
if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
/* submission failed, escalate to USB port reset */
usb_queue_reset_device(cs->hw.bas->interface);
}
/* check_pending
* check for completion of pending control request
* parameter:
* ucs hardware specific controller state structure
*/
static void check_pending(struct bas_cardstate *ucs)
{
unsigned long flags;
spin_lock_irqsave(&ucs->lock, flags);
switch (ucs->pending) {
case 0:
break;
case HD_OPEN_ATCHANNEL:
if (ucs->basstate & BS_ATOPEN)
ucs->pending = 0;
break;
case HD_OPEN_B1CHANNEL:
if (ucs->basstate & BS_B1OPEN)
ucs->pending = 0;
break;
case HD_OPEN_B2CHANNEL:
if (ucs->basstate & BS_B2OPEN)
ucs->pending = 0;
break;
case HD_CLOSE_ATCHANNEL:
if (!(ucs->basstate & BS_ATOPEN))
ucs->pending = 0;
break;
case HD_CLOSE_B1CHANNEL:
if (!(ucs->basstate & BS_B1OPEN))
ucs->pending = 0;
break;
case HD_CLOSE_B2CHANNEL:
if (!(ucs->basstate & BS_B2OPEN))
ucs->pending = 0;
break;
case HD_DEVICE_INIT_ACK: /* no reply expected */
ucs->pending = 0;
break;
case HD_RESET_INTERRUPT_PIPE:
if (!(ucs->basstate & BS_RESETTING))
ucs->pending = 0;
break;
/*
* HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
* and should never end up here
*/
default:
dev_warn(&ucs->interface->dev,
"unknown pending request 0x%02x cleared\n",
ucs->pending);
ucs->pending = 0;
}
if (!ucs->pending)
del_timer(&ucs->timer_ctrl);
spin_unlock_irqrestore(&ucs->lock, flags);
}
/* cmd_in_timeout
* timeout routine for command input request
* argument:
* controller state structure
*/
static void cmd_in_timeout(struct timer_list *t)
{
struct bas_cardstate *ucs = from_timer(ucs, t, timer_cmd_in);
struct cardstate *cs = ucs->cs;
int rc;
if (!ucs->rcvbuf_size) {
gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
return;
}
if (ucs->retry_cmd_in++ >= BAS_RETRY) {
dev_err(cs->dev,
"control read: timeout, giving up after %d tries\n",
ucs->retry_cmd_in);
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
error_reset(cs);
return;
}
gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
__func__, ucs->retry_cmd_in);
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc < 0) {
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
if (rc != -ENODEV)
error_reset(cs);
}
}
/* read_ctrl_callback
* USB completion handler for control pipe input
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block
* urb->context = inbuf structure for controller state
*/
static void read_ctrl_callback(struct urb *urb)
{
struct inbuf_t *inbuf = urb->context;
struct cardstate *cs = inbuf->cs;
struct bas_cardstate *ucs = cs->hw.bas;
int status = urb->status;
unsigned numbytes;
int rc;
update_basstate(ucs, 0, BS_ATRDPEND);
wake_up(&ucs->waitqueue);
del_timer(&ucs->timer_cmd_in);
switch (status) {
case 0: /* normal completion */
numbytes = urb->actual_length;
if (unlikely(numbytes != ucs->rcvbuf_size)) {
dev_warn(cs->dev,
"control read: received %d chars, expected %d\n",
numbytes, ucs->rcvbuf_size);
if (numbytes > ucs->rcvbuf_size)
numbytes = ucs->rcvbuf_size;
}
/* copy received bytes to inbuf, notify event layer */
if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
gigaset_schedule_event(cs);
}
break;
case -ENOENT: /* cancelled */
case -ECONNRESET: /* cancelled (async) */
case -EINPROGRESS: /* pending */
case -ENODEV: /* device removed */
case -ESHUTDOWN: /* device shut down */
/* no further action necessary */
gig_dbg(DEBUG_USBREQ, "%s: %s",
__func__, get_usb_statmsg(status));
break;
default: /* other errors: retry */
if (ucs->retry_cmd_in++ < BAS_RETRY) {
gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
get_usb_statmsg(status), ucs->retry_cmd_in);
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc >= 0)
/* successfully resubmitted, skip freeing */
return;
if (rc == -ENODEV)
/* disconnect, no further action necessary */
break;
}
dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
get_usb_statmsg(status), ucs->retry_cmd_in);
error_reset(cs);
}
/* read finished, free buffer */
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
}
/* atread_submit
* submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
* parameters:
* cs controller state structure
* timeout timeout in 1/10 sec., 0: none
* return value:
* 0 on success
* -EBUSY if another request is pending
* any URB submission error code
*/
static int atread_submit(struct cardstate *cs, int timeout)
{
struct bas_cardstate *ucs = cs->hw.bas;
int basstate;
int ret;
gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
ucs->rcvbuf_size);
basstate = update_basstate(ucs, BS_ATRDPEND, 0);
if (basstate & BS_ATRDPEND) {
dev_err(cs->dev,
"could not submit HD_READ_ATMESSAGE: URB busy\n");
return -EBUSY;
}
if (basstate & BS_SUSPEND) {
dev_notice(cs->dev,
"HD_READ_ATMESSAGE not submitted, "
"suspend in progress\n");
update_basstate(ucs, 0, BS_ATRDPEND);
/* treat like disconnect */
return -ENODEV;
}
ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
ucs->dr_cmd_in.wValue = 0;
ucs->dr_cmd_in.wIndex = 0;
ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
usb_rcvctrlpipe(ucs->udev, 0),
(unsigned char *) &ucs->dr_cmd_in,
ucs->rcvbuf, ucs->rcvbuf_size,
read_ctrl_callback, cs->inbuf);
ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
if (ret != 0) {
update_basstate(ucs, 0, BS_ATRDPEND);
dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
get_usb_rcmsg(ret));
return ret;
}
if (timeout > 0) {
gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
}
return 0;
}
/* int_in_work
* workqueue routine to clear halt on interrupt in endpoint
*/
static void int_in_work(struct work_struct *work)
{
struct bas_cardstate *ucs =
container_of(work, struct bas_cardstate, int_in_wq);
struct urb *urb = ucs->urb_int_in;
struct cardstate *cs = urb->context;
int rc;
/* clear halt condition */
rc = usb_clear_halt(ucs->udev, urb->pipe);
gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
if (rc == 0)
/* success, resubmit interrupt read URB */
rc = usb_submit_urb(urb, GFP_ATOMIC);
switch (rc) {
case 0: /* success */
case -ENODEV: /* device gone */
case -EINVAL: /* URB already resubmitted, or terminal badness */
break;
default: /* failure: try to recover by resetting the device */
dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
if (rc == 0) {
rc = usb_reset_device(ucs->udev);
usb_unlock_device(ucs->udev);
}
}
ucs->retry_int_in = 0;
}
/* int_in_resubmit
* timer routine for interrupt read delayed resubmit
* argument:
* controller state structure
*/
static void int_in_resubmit(struct timer_list *t)
{
struct bas_cardstate *ucs = from_timer(ucs, t, timer_int_in);
struct cardstate *cs = ucs->cs;
int rc;
if (ucs->retry_int_in++ >= BAS_RETRY) {
dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
ucs->retry_int_in);
usb_queue_reset_device(ucs->interface);
return;
}
gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
if (rc != 0 && rc != -ENODEV) {
dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
get_usb_rcmsg(rc));
usb_queue_reset_device(ucs->interface);
}
}
/* read_int_callback
* USB completion handler for interrupt pipe input
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block
* urb->context = controller state structure
*/
static void read_int_callback(struct urb *urb)
{
struct cardstate *cs = urb->context;
struct bas_cardstate *ucs = cs->hw.bas;
struct bc_state *bcs;
int status = urb->status;
unsigned long flags;
int rc;
unsigned l;
int channel;
switch (status) {
case 0: /* success */
ucs->retry_int_in = 0;
break;
case -EPIPE: /* endpoint stalled */
schedule_work(&ucs->int_in_wq);
/* fall through */
case -ENOENT: /* cancelled */
case -ECONNRESET: /* cancelled (async) */
case -EINPROGRESS: /* pending */
case -ENODEV: /* device removed */
case -ESHUTDOWN: /* device shut down */
/* no further action necessary */
gig_dbg(DEBUG_USBREQ, "%s: %s",
__func__, get_usb_statmsg(status));
return;
case -EPROTO: /* protocol error or unplug */
case -EILSEQ:
case -ETIME:
/* resubmit after delay */
gig_dbg(DEBUG_USBREQ, "%s: %s",
__func__, get_usb_statmsg(status));
mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
return;
default: /* other errors: just resubmit */
dev_warn(cs->dev, "interrupt read: %s\n",
get_usb_statmsg(status));
goto resubmit;
}
/* drop incomplete packets even if the missing bytes wouldn't matter */
if (unlikely(urb->actual_length < IP_MSGSIZE)) {
dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
urb->actual_length);
goto resubmit;
}
l = (unsigned) ucs->int_in_buf[1] +
(((unsigned) ucs->int_in_buf[2]) << 8);
gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
urb->actual_length, (int)ucs->int_in_buf[0], l,
(int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
channel = 0;
switch (ucs->int_in_buf[0]) {
case HD_DEVICE_INIT_OK:
update_basstate(ucs, BS_INIT, 0);
break;
case HD_READY_SEND_ATDATA:
del_timer(&ucs->timer_atrdy);
update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
start_cbsend(cs);
break;
case HD_OPEN_B2CHANNEL_ACK:
++channel;
/* fall through */
case HD_OPEN_B1CHANNEL_ACK:
bcs = cs->bcs + channel;
update_basstate(ucs, BS_B1OPEN << channel, 0);
gigaset_bchannel_up(bcs);
break;
case HD_OPEN_ATCHANNEL_ACK:
update_basstate(ucs, BS_ATOPEN, 0);
start_cbsend(cs);
break;
case HD_CLOSE_B2CHANNEL_ACK:
++channel;
/* fall through */
case HD_CLOSE_B1CHANNEL_ACK:
bcs = cs->bcs + channel;
update_basstate(ucs, 0, BS_B1OPEN << channel);
stopurbs(bcs->hw.bas);
gigaset_bchannel_down(bcs);
break;
case HD_CLOSE_ATCHANNEL_ACK:
update_basstate(ucs, 0, BS_ATOPEN);
break;
case HD_B2_FLOW_CONTROL:
++channel;
/* fall through */
case HD_B1_FLOW_CONTROL:
bcs = cs->bcs + channel;
atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
&bcs->hw.bas->corrbytes);
gig_dbg(DEBUG_ISO,
"Flow control (channel %d, sub %d): 0x%02x => %d",
channel, bcs->hw.bas->numsub, l,
atomic_read(&bcs->hw.bas->corrbytes));
break;
case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
if (!l) {
dev_warn(cs->dev,
"HD_RECEIVEATDATA_ACK with length 0 ignored\n");
break;
}
spin_lock_irqsave(&cs->lock, flags);
if (ucs->basstate & BS_ATRDPEND) {
spin_unlock_irqrestore(&cs->lock, flags);
dev_warn(cs->dev,
"HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
l, ucs->rcvbuf_size);
break;
}
if (ucs->rcvbuf_size) {
/* throw away previous buffer - we have no queue */
dev_err(cs->dev,
"receive AT data overrun, %d bytes lost\n",
ucs->rcvbuf_size);
kfree(ucs->rcvbuf);
ucs->rcvbuf_size = 0;
}
ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
if (ucs->rcvbuf == NULL) {
spin_unlock_irqrestore(&cs->lock, flags);
dev_err(cs->dev, "out of memory receiving AT data\n");
break;
}
ucs->rcvbuf_size = l;
ucs->retry_cmd_in = 0;
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc < 0) {
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
}
spin_unlock_irqrestore(&cs->lock, flags);
if (rc < 0 && rc != -ENODEV)
error_reset(cs);
break;
case HD_RESET_INTERRUPT_PIPE_ACK:
update_basstate(ucs, 0, BS_RESETTING);
dev_notice(cs->dev, "interrupt pipe reset\n");
break;
case HD_SUSPEND_END:
gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
break;
default:
dev_warn(cs->dev,
"unknown Gigaset signal 0x%02x (%u) ignored\n",
(int) ucs->int_in_buf[0], l);
}
check_pending(ucs);
wake_up(&ucs->waitqueue);
resubmit:
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc != 0 && rc != -ENODEV)) {
dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
get_usb_rcmsg(rc));
error_reset(cs);
}
}
/* read_iso_callback
* USB completion handler for B channel isochronous input
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = bc_state structure
*/
static void read_iso_callback(struct urb *urb)
{
struct bc_state *bcs;
struct bas_bc_state *ubc;
int status = urb->status;
unsigned long flags;
int i, rc;
/* status codes not worth bothering the tasklet with */
if (unlikely(status == -ENOENT ||
status == -ECONNRESET ||
status == -EINPROGRESS ||
status == -ENODEV ||
status == -ESHUTDOWN)) {
gig_dbg(DEBUG_ISO, "%s: %s",
__func__, get_usb_statmsg(status));
return;
}
bcs = urb->context;
ubc = bcs->hw.bas;
spin_lock_irqsave(&ubc->isoinlock, flags);
if (likely(ubc->isoindone == NULL)) {
/* pass URB to tasklet */
ubc->isoindone = urb;
ubc->isoinstatus = status;
tasklet_hi_schedule(&ubc->rcvd_tasklet);
} else {
/* tasklet still busy, drop data and resubmit URB */
gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
ubc->loststatus = status;
for (i = 0; i < BAS_NUMFRAMES; i++) {
ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
if (unlikely(urb->iso_frame_desc[i].status != 0 &&
urb->iso_frame_desc[i].status != -EINPROGRESS))
ubc->loststatus = urb->iso_frame_desc[i].status;
urb->iso_frame_desc[i].status = 0;
urb->iso_frame_desc[i].actual_length = 0;
}
if (likely(ubc->running)) {
/* urb->dev is clobbered by USB subsystem */
urb->dev = bcs->cs->hw.bas->udev;
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = BAS_NUMFRAMES;
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc != 0 && rc != -ENODEV)) {
dev_err(bcs->cs->dev,
"could not resubmit isoc read URB: %s\n",
get_usb_rcmsg(rc));
dump_urb(DEBUG_ISO, "isoc read", urb);
error_hangup(bcs);
}
}
}
spin_unlock_irqrestore(&ubc->isoinlock, flags);
}
/* write_iso_callback
* USB completion handler for B channel isochronous output
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = isow_urbctx_t structure
*/
static void write_iso_callback(struct urb *urb)
{
struct isow_urbctx_t *ucx;
struct bas_bc_state *ubc;
int status = urb->status;
unsigned long flags;
/* status codes not worth bothering the tasklet with */
if (unlikely(status == -ENOENT ||
status == -ECONNRESET ||
status == -EINPROGRESS ||
status == -ENODEV ||
status == -ESHUTDOWN)) {
gig_dbg(DEBUG_ISO, "%s: %s",
__func__, get_usb_statmsg(status));
return;
}
/* pass URB context to tasklet */
ucx = urb->context;
ubc = ucx->bcs->hw.bas;
ucx->status = status;
spin_lock_irqsave(&ubc->isooutlock, flags);
ubc->isooutovfl = ubc->isooutdone;
ubc->isooutdone = ucx;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
tasklet_hi_schedule(&ubc->sent_tasklet);
}
/* starturbs
* prepare and submit USB request blocks for isochronous input and output
* argument:
* B channel control structure
* return value:
* 0 on success
* < 0 on error (no URBs submitted)
*/
static int starturbs(struct bc_state *bcs)
{
struct usb_device *udev = bcs->cs->hw.bas->udev;
struct bas_bc_state *ubc = bcs->hw.bas;
struct urb *urb;
int j, k;
int rc;
/* initialize L2 reception */
if (bcs->proto2 == L2_HDLC)
bcs->inputstate |= INS_flag_hunt;
/* submit all isochronous input URBs */
ubc->running = 1;
for (k = 0; k < BAS_INURBS; k++) {
urb = ubc->isoinurbs[k];
if (!urb) {
rc = -EFAULT;
goto error;
}
usb_fill_int_urb(urb, udev,
usb_rcvisocpipe(udev, 3 + 2 * bcs->channel),
ubc->isoinbuf + k * BAS_INBUFSIZE,
BAS_INBUFSIZE, read_iso_callback, bcs,
BAS_FRAMETIME);
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = BAS_NUMFRAMES;
for (j = 0; j < BAS_NUMFRAMES; j++) {
urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
urb->iso_frame_desc[j].length = BAS_MAXFRAME;
urb->iso_frame_desc[j].status = 0;
urb->iso_frame_desc[j].actual_length = 0;
}
dump_urb(DEBUG_ISO, "Initial isoc read", urb);
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (rc != 0)
goto error;
}
/* initialize L2 transmission */
gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
/* set up isochronous output URBs for flag idling */
for (k = 0; k < BAS_OUTURBS; ++k) {
urb = ubc->isoouturbs[k].urb;
if (!urb) {
rc = -EFAULT;
goto error;
}
usb_fill_int_urb(urb, udev,
usb_sndisocpipe(udev, 4 + 2 * bcs->channel),
ubc->isooutbuf->data,
sizeof(ubc->isooutbuf->data),
write_iso_callback, &ubc->isoouturbs[k],
BAS_FRAMETIME);
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = BAS_NUMFRAMES;
for (j = 0; j < BAS_NUMFRAMES; ++j) {
urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
urb->iso_frame_desc[j].length = BAS_NORMFRAME;
urb->iso_frame_desc[j].status = 0;
urb->iso_frame_desc[j].actual_length = 0;
}
ubc->isoouturbs[k].limit = -1;
}
/* keep one URB free, submit the others */
for (k = 0; k < BAS_OUTURBS - 1; ++k) {
dump_urb(DEBUG_ISO, "Initial isoc write", urb);
rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
if (rc != 0)
goto error;
}
dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS - 1];
ubc->isooutdone = ubc->isooutovfl = NULL;
return 0;
error:
stopurbs(ubc);
return rc;
}
/* stopurbs
* cancel the USB request blocks for isochronous input and output
* errors are silently ignored
* argument:
* B channel control structure
*/
static void stopurbs(struct bas_bc_state *ubc)
{
int k, rc;
ubc->running = 0;
for (k = 0; k < BAS_INURBS; ++k) {
rc = usb_unlink_urb(ubc->isoinurbs[k]);
gig_dbg(DEBUG_ISO,
"%s: isoc input URB %d unlinked, result = %s",
__func__, k, get_usb_rcmsg(rc));
}
for (k = 0; k < BAS_OUTURBS; ++k) {
rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
gig_dbg(DEBUG_ISO,
"%s: isoc output URB %d unlinked, result = %s",
__func__, k, get_usb_rcmsg(rc));
}
}
/* Isochronous Write - Bottom Half */
/* =============================== */
/* submit_iso_write_urb
* fill and submit the next isochronous write URB
* parameters:
* ucx context structure containing URB
* return value:
* number of frames submitted in URB
* 0 if URB not submitted because no data available (isooutbuf busy)
* error code < 0 on error
*/
static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
{
struct urb *urb = ucx->urb;
struct bas_bc_state *ubc = ucx->bcs->hw.bas;
struct usb_iso_packet_descriptor *ifd;
int corrbytes, nframe, rc;
/* urb->dev is clobbered by USB subsystem */
urb->dev = ucx->bcs->cs->hw.bas->udev;
urb->transfer_flags = URB_ISO_ASAP;
urb->transfer_buffer = ubc->isooutbuf->data;
urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
ifd = &urb->iso_frame_desc[nframe];
/* compute frame length according to flow control */
ifd->length = BAS_NORMFRAME;
corrbytes = atomic_read(&ubc->corrbytes);
if (corrbytes != 0) {
gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
__func__, corrbytes);
if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
ifd->length += corrbytes;
atomic_add(-corrbytes, &ubc->corrbytes);
}
/* retrieve block of data to send */
rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
if (rc < 0) {
if (rc == -EBUSY) {
gig_dbg(DEBUG_ISO,
"%s: buffer busy at frame %d",
__func__, nframe);
/* tasklet will be restarted from
gigaset_isoc_send_skb() */
} else {
dev_err(ucx->bcs->cs->dev,
"%s: buffer error %d at frame %d\n",
__func__, rc, nframe);
return rc;
}
break;
}
ifd->offset = rc;
ucx->limit = ubc->isooutbuf->nextread;
ifd->status = 0;
ifd->actual_length = 0;
}
if (unlikely(nframe == 0))
return 0; /* no data to send */
urb->number_of_packets = nframe;
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc)) {
if (rc == -ENODEV)
/* device removed - give up silently */
gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
else
dev_err(ucx->bcs->cs->dev,
"could not submit isoc write URB: %s\n",
get_usb_rcmsg(rc));
return rc;
}
++ubc->numsub;
return nframe;
}
/* write_iso_tasklet
* tasklet scheduled when an isochronous output URB from the Gigaset device
* has completed
* parameter:
* data B channel state structure
*/
static void write_iso_tasklet(unsigned long data)
{
struct bc_state *bcs = (struct bc_state *) data;
struct bas_bc_state *ubc = bcs->hw.bas;
struct cardstate *cs = bcs->cs;
struct isow_urbctx_t *done, *next, *ovfl;
struct urb *urb;
int status;
struct usb_iso_packet_descriptor *ifd;
unsigned long flags;
int i;
struct sk_buff *skb;
int len;
int rc;
/* loop while completed URBs arrive in time */
for (;;) {
if (unlikely(!(ubc->running))) {
gig_dbg(DEBUG_ISO, "%s: not running", __func__);
return;
}
/* retrieve completed URBs */
spin_lock_irqsave(&ubc->isooutlock, flags);
done = ubc->isooutdone;
ubc->isooutdone = NULL;
ovfl = ubc->isooutovfl;
ubc->isooutovfl = NULL;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (ovfl) {
dev_err(cs->dev, "isoc write underrun\n");
error_hangup(bcs);
break;
}
if (!done)
break;
/* submit free URB if available */
spin_lock_irqsave(&ubc->isooutlock, flags);
next = ubc->isooutfree;
ubc->isooutfree = NULL;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (next) {
rc = submit_iso_write_urb(next);
if (unlikely(rc <= 0 && rc != -ENODEV)) {
/* could not submit URB, put it back */
spin_lock_irqsave(&ubc->isooutlock, flags);
if (ubc->isooutfree == NULL) {
ubc->isooutfree = next;
next = NULL;
}
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (next) {
/* couldn't put it back */
dev_err(cs->dev,
"losing isoc write URB\n");
error_hangup(bcs);
}
}
}
/* process completed URB */
urb = done->urb;
status = done->status;
switch (status) {
case -EXDEV: /* partial completion */
gig_dbg(DEBUG_ISO, "%s: URB partially completed",
__func__);
/* fall through - what's the difference anyway? */
case 0: /* normal completion */
/* inspect individual frames
* assumptions (for lack of documentation):
* - actual_length bytes of first frame in error are
* successfully sent
* - all following frames are not sent at all
*/
for (i = 0; i < BAS_NUMFRAMES; i++) {
ifd = &urb->iso_frame_desc[i];
if (ifd->status ||
ifd->actual_length != ifd->length) {
dev_warn(cs->dev,
"isoc write: frame %d[%d/%d]: %s\n",
i, ifd->actual_length,
ifd->length,
get_usb_statmsg(ifd->status));
break;
}
}
break;
case -EPIPE: /* stall - probably underrun */
dev_err(cs->dev, "isoc write: stalled\n");
error_hangup(bcs);
break;
default: /* other errors */
dev_warn(cs->dev, "isoc write: %s\n",
get_usb_statmsg(status));
}
/* mark the write buffer area covered by this URB as free */
if (done->limit >= 0)
ubc->isooutbuf->read = done->limit;
/* mark URB as free */
spin_lock_irqsave(&ubc->isooutlock, flags);
next = ubc->isooutfree;
ubc->isooutfree = done;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (next) {
/* only one URB still active - resubmit one */
rc = submit_iso_write_urb(next);
if (unlikely(rc <= 0 && rc != -ENODEV)) {
/* couldn't submit */
error_hangup(bcs);
}
}
}
/* process queued SKBs */
while ((skb = skb_dequeue(&bcs->squeue))) {
/* copy to output buffer, doing L2 encapsulation */
len = skb->len;
if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
/* insufficient buffer space, push back onto queue */
skb_queue_head(&bcs->squeue, skb);
gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
__func__, skb_queue_len(&bcs->squeue));
break;
}
skb_pull(skb, len);
gigaset_skb_sent(bcs, skb);
dev_kfree_skb_any(skb);
}
}
/* Isochronous Read - Bottom Half */
/* ============================== */
/* read_iso_tasklet
* tasklet scheduled when an isochronous input URB from the Gigaset device
* has completed
* parameter:
* data B channel state structure
*/
static void read_iso_tasklet(unsigned long data)
{
struct bc_state *bcs = (struct bc_state *) data;
struct bas_bc_state *ubc = bcs->hw.bas;
struct cardstate *cs = bcs->cs;
struct urb *urb;
int status;
struct usb_iso_packet_descriptor *ifd;
char *rcvbuf;
unsigned long flags;
int totleft, numbytes, offset, frame, rc;
/* loop while more completed URBs arrive in the meantime */
for (;;) {
/* retrieve URB */
spin_lock_irqsave(&ubc->isoinlock, flags);
urb = ubc->isoindone;
if (!urb) {
spin_unlock_irqrestore(&ubc->isoinlock, flags);
return;
}
status = ubc->isoinstatus;
ubc->isoindone = NULL;
if (unlikely(ubc->loststatus != -EINPROGRESS)) {
dev_warn(cs->dev,
"isoc read overrun, URB dropped (status: %s, %d bytes)\n",
get_usb_statmsg(ubc->loststatus),
ubc->isoinlost);
ubc->loststatus = -EINPROGRESS;
}
spin_unlock_irqrestore(&ubc->isoinlock, flags);
if (unlikely(!(ubc->running))) {
gig_dbg(DEBUG_ISO,
"%s: channel not running, "
"dropped URB with status: %s",
__func__, get_usb_statmsg(status));
return;
}
switch (status) {
case 0: /* normal completion */
break;
case -EXDEV: /* inspect individual frames
(we do that anyway) */
gig_dbg(DEBUG_ISO, "%s: URB partially completed",
__func__);
break;
case -ENOENT:
case -ECONNRESET:
case -EINPROGRESS:
gig_dbg(DEBUG_ISO, "%s: %s",
__func__, get_usb_statmsg(status));
continue; /* -> skip */
case -EPIPE:
dev_err(cs->dev, "isoc read: stalled\n");
error_hangup(bcs);
continue; /* -> skip */
default: /* other error */
dev_warn(cs->dev, "isoc read: %s\n",
get_usb_statmsg(status));
goto error;
}
rcvbuf = urb->transfer_buffer;
totleft = urb->actual_length;
for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
ifd = &urb->iso_frame_desc[frame];
numbytes = ifd->actual_length;
switch (ifd->status) {
case 0: /* success */
break;
case -EPROTO: /* protocol error or unplug */
case -EILSEQ:
case -ETIME:
/* probably just disconnected, ignore */
gig_dbg(DEBUG_ISO,
"isoc read: frame %d[%d]: %s\n",
frame, numbytes,
get_usb_statmsg(ifd->status));
break;
default: /* other error */
/* report, assume transferred bytes are ok */
dev_warn(cs->dev,
"isoc read: frame %d[%d]: %s\n",
frame, numbytes,
get_usb_statmsg(ifd->status));
}
if (unlikely(numbytes > BAS_MAXFRAME))
dev_warn(cs->dev,
"isoc read: frame %d[%d]: %s\n",
frame, numbytes,
"exceeds max frame size");
if (unlikely(numbytes > totleft)) {
dev_warn(cs->dev,
"isoc read: frame %d[%d]: %s\n",
frame, numbytes,
"exceeds total transfer length");
numbytes = totleft;
}
offset = ifd->offset;
if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
dev_warn(cs->dev,
"isoc read: frame %d[%d]: %s\n",
frame, numbytes,
"exceeds end of buffer");
numbytes = BAS_INBUFSIZE - offset;
}
gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
totleft -= numbytes;
}
if (unlikely(totleft > 0))
dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
totleft);
error:
/* URB processed, resubmit */
for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
urb->iso_frame_desc[frame].status = 0;
urb->iso_frame_desc[frame].actual_length = 0;
}
/* urb->dev is clobbered by USB subsystem */
urb->dev = bcs->cs->hw.bas->udev;
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = BAS_NUMFRAMES;
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc != 0 && rc != -ENODEV)) {
dev_err(cs->dev,
"could not resubmit isoc read URB: %s\n",
get_usb_rcmsg(rc));
dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
error_hangup(bcs);
}
}
}
/* Channel Operations */
/* ================== */
/* req_timeout
* timeout routine for control output request
* argument:
* controller state structure
*/
static void req_timeout(struct timer_list *t)
{
struct bas_cardstate *ucs = from_timer(ucs, t, timer_ctrl);
struct cardstate *cs = ucs->cs;
int pending;
unsigned long flags;
check_pending(ucs);
spin_lock_irqsave(&ucs->lock, flags);
pending = ucs->pending;
ucs->pending = 0;
spin_unlock_irqrestore(&ucs->lock, flags);
switch (pending) {
case 0: /* no pending request */
gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
break;
case HD_OPEN_ATCHANNEL:
dev_err(cs->dev, "timeout opening AT channel\n");
error_reset(cs);
break;
case HD_OPEN_B1CHANNEL:
dev_err(cs->dev, "timeout opening channel 1\n");
error_hangup(&cs->bcs[0]);
break;
case HD_OPEN_B2CHANNEL:
dev_err(cs->dev, "timeout opening channel 2\n");
error_hangup(&cs->bcs[1]);
break;
case HD_CLOSE_ATCHANNEL:
dev_err(cs->dev, "timeout closing AT channel\n");
error_reset(cs);
break;
case HD_CLOSE_B1CHANNEL:
dev_err(cs->dev, "timeout closing channel 1\n");
error_reset(cs);
break;
case HD_CLOSE_B2CHANNEL:
dev_err(cs->dev, "timeout closing channel 2\n");
error_reset(cs);
break;
case HD_RESET_INTERRUPT_PIPE:
/* error recovery escalation */
dev_err(cs->dev,
"reset interrupt pipe timeout, attempting USB reset\n");
usb_queue_reset_device(ucs->interface);
break;
default:
dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
pending);
}
wake_up(&ucs->waitqueue);
}
/* write_ctrl_callback
* USB completion handler for control pipe output
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = hardware specific controller state structure
*/
static void write_ctrl_callback(struct urb *urb)
{
struct bas_cardstate *ucs = urb->context;
int status = urb->status;
int rc;
unsigned long flags;
/* check status */
switch (status) {
case 0: /* normal completion */
spin_lock_irqsave(&ucs->lock, flags);
switch (ucs->pending) {
case HD_DEVICE_INIT_ACK: /* no reply expected */
del_timer(&ucs->timer_ctrl);
ucs->pending = 0;
break;
}
spin_unlock_irqrestore(&ucs->lock, flags);
return;
case -ENOENT: /* cancelled */
case -ECONNRESET: /* cancelled (async) */
case -EINPROGRESS: /* pending */
case -ENODEV: /* device removed */
case -ESHUTDOWN: /* device shut down */
/* ignore silently */
gig_dbg(DEBUG_USBREQ, "%s: %s",
__func__, get_usb_statmsg(status));
break;
default: /* any failure */
/* don't retry if suspend requested */
if (++ucs->retry_ctrl > BAS_RETRY ||
(ucs->basstate & BS_SUSPEND)) {
dev_err(&ucs->interface->dev,
"control request 0x%02x failed: %s\n",
ucs->dr_ctrl.bRequest,
get_usb_statmsg(status));
break; /* give up */
}
dev_notice(&ucs->interface->dev,
"control request 0x%02x: %s, retry %d\n",
ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
ucs->retry_ctrl);
/* urb->dev is clobbered by USB subsystem */
urb->dev = ucs->udev;
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc)) {
dev_err(&ucs->interface->dev,
"could not resubmit request 0x%02x: %s\n",
ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
break;
}
/* resubmitted */
return;
}
/* failed, clear pending request */
spin_lock_irqsave(&ucs->lock, flags);
del_timer(&ucs->timer_ctrl);
ucs->pending = 0;
spin_unlock_irqrestore(&ucs->lock, flags);
wake_up(&ucs->waitqueue);
}
/* req_submit
* submit a control output request without message buffer to the Gigaset base
* and optionally start a timeout
* parameters:
* bcs B channel control structure
* req control request code (HD_*)
* val control request parameter value (set to 0 if unused)
* timeout timeout in seconds (0: no timeout)
* return value:
* 0 on success
* -EBUSY if another request is pending
* any URB submission error code
*/
static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
{
struct bas_cardstate *ucs = bcs->cs->hw.bas;
int ret;
unsigned long flags;
gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
spin_lock_irqsave(&ucs->lock, flags);
if (ucs->pending) {
spin_unlock_irqrestore(&ucs->lock, flags);
dev_err(bcs->cs->dev,
"submission of request 0x%02x failed: "
"request 0x%02x still pending\n",
req, ucs->pending);
return -EBUSY;
}
ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
ucs->dr_ctrl.bRequest = req;
ucs->dr_ctrl.wValue = cpu_to_le16(val);
ucs->dr_ctrl.wIndex = 0;
ucs->dr_ctrl.wLength = 0;
usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
(unsigned char *) &ucs->dr_ctrl, NULL, 0,
write_ctrl_callback, ucs);
ucs->retry_ctrl = 0;
ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
if (unlikely(ret)) {
dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
req, get_usb_rcmsg(ret));
spin_unlock_irqrestore(&ucs->lock, flags);
return ret;
}
ucs->pending = req;
if (timeout > 0) {
gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
}
spin_unlock_irqrestore(&ucs->lock, flags);
return 0;
}
/* gigaset_init_bchannel
* called by common.c to connect a B channel
* initialize isochronous I/O and tell the Gigaset base to open the channel
* argument:
* B channel control structure
* return value:
* 0 on success, error code < 0 on error
*/
static int gigaset_init_bchannel(struct bc_state *bcs)
{
struct cardstate *cs = bcs->cs;
int req, ret;
unsigned long flags;
spin_lock_irqsave(&cs->lock, flags);
if (unlikely(!cs->connected)) {
gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
spin_unlock_irqrestore(&cs->lock, flags);
return -ENODEV;
}
if (cs->hw.bas->basstate & BS_SUSPEND) {
dev_notice(cs->dev,
"not starting isoc I/O, suspend in progress\n");
spin_unlock_irqrestore(&cs->lock, flags);
return -EHOSTUNREACH;
}
ret = starturbs(bcs);
if (ret < 0) {
spin_unlock_irqrestore(&cs->lock, flags);
dev_err(cs->dev,
"could not start isoc I/O for channel B%d: %s\n",
bcs->channel + 1,
ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
if (ret != -ENODEV)
error_hangup(bcs);
return ret;
}
req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
if (ret < 0) {
dev_err(cs->dev, "could not open channel B%d\n",
bcs->channel + 1);
stopurbs(bcs->hw.bas);
}
spin_unlock_irqrestore(&cs->lock, flags);
if (ret < 0 && ret != -ENODEV)
error_hangup(bcs);
return ret;
}
/* gigaset_close_bchannel
* called by common.c to disconnect a B channel
* tell the Gigaset base to close the channel
* stopping isochronous I/O and LL notification will be done when the
* acknowledgement for the close arrives
* argument:
* B channel control structure
* return value:
* 0 on success, error code < 0 on error
*/
static int gigaset_close_bchannel(struct bc_state *bcs)
{
struct cardstate *cs = bcs->cs;
int req, ret;
unsigned long flags;
spin_lock_irqsave(&cs->lock, flags);
if (unlikely(!cs->connected)) {
spin_unlock_irqrestore(&cs->lock, flags);
gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
return -ENODEV;
}
if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
/* channel not running: just signal common.c */
spin_unlock_irqrestore(&cs->lock, flags);
gigaset_bchannel_down(bcs);
return 0;
}
/* channel running: tell device to close it */
req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
if (ret < 0)
dev_err(cs->dev, "closing channel B%d failed\n",
bcs->channel + 1);
spin_unlock_irqrestore(&cs->lock, flags);
return ret;
}
/* Device Operations */
/* ================= */
/* complete_cb
* unqueue first command buffer from queue, waking any sleepers
* must be called with cs->cmdlock held
* parameter:
* cs controller state structure
*/
static void complete_cb(struct cardstate *cs)
{
struct cmdbuf_t *cb = cs->cmdbuf;
/* unqueue completed buffer */
cs->cmdbytes -= cs->curlen;
gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
cs->curlen, cs->cmdbytes);
if (cb->next != NULL) {
cs->cmdbuf = cb->next;
cs->cmdbuf->prev = NULL;
cs->curlen = cs->cmdbuf->len;
} else {
cs->cmdbuf = NULL;
cs->lastcmdbuf = NULL;
cs->curlen = 0;
}
if (cb->wake_tasklet)
tasklet_schedule(cb->wake_tasklet);
kfree(cb);
}
/* write_command_callback
* USB completion handler for AT command transmission
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = controller state structure
*/
static void write_command_callback(struct urb *urb)
{
struct cardstate *cs = urb->context;
struct bas_cardstate *ucs = cs->hw.bas;
int status = urb->status;
unsigned long flags;
update_basstate(ucs, 0, BS_ATWRPEND);
wake_up(&ucs->waitqueue);
/* check status */
switch (status) {
case 0: /* normal completion */
break;
case -ENOENT: /* cancelled */
case -ECONNRESET: /* cancelled (async) */
case -EINPROGRESS: /* pending */
case -ENODEV: /* device removed */
case -ESHUTDOWN: /* device shut down */
/* ignore silently */
gig_dbg(DEBUG_USBREQ, "%s: %s",
__func__, get_usb_statmsg(status));
return;
default: /* any failure */
if (++ucs->retry_cmd_out > BAS_RETRY) {
dev_warn(cs->dev,
"command write: %s, "
"giving up after %d retries\n",
get_usb_statmsg(status),
ucs->retry_cmd_out);
break;
}
if (ucs->basstate & BS_SUSPEND) {
dev_warn(cs->dev,
"command write: %s, "
"won't retry - suspend requested\n",
get_usb_statmsg(status));
break;
}
if (cs->cmdbuf == NULL) {
dev_warn(cs->dev,
"command write: %s, "
"cannot retry - cmdbuf gone\n",
get_usb_statmsg(status));
break;
}
dev_notice(cs->dev, "command write: %s, retry %d\n",
get_usb_statmsg(status), ucs->retry_cmd_out);
if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
/* resubmitted - bypass regular exit block */
return;
/* command send failed, assume base still waiting */
update_basstate(ucs, BS_ATREADY, 0);
}
spin_lock_irqsave(&cs->cmdlock, flags);
if (cs->cmdbuf != NULL)
complete_cb(cs);
spin_unlock_irqrestore(&cs->cmdlock, flags);
}
/* atrdy_timeout
* timeout routine for AT command transmission
* argument:
* controller state structure
*/
static void atrdy_timeout(struct timer_list *t)
{
struct bas_cardstate *ucs = from_timer(ucs, t, timer_atrdy);
struct cardstate *cs = ucs->cs;
dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
/* fake the missing signal - what else can I do? */
update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
start_cbsend(cs);
}
/* atwrite_submit
* submit an HD_WRITE_ATMESSAGE command URB
* parameters:
* cs controller state structure
* buf buffer containing command to send
* len length of command to send
* return value:
* 0 on success
* -EBUSY if another request is pending
* any URB submission error code
*/
static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
{
struct bas_cardstate *ucs = cs->hw.bas;
int rc;
gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
dev_err(cs->dev,
"could not submit HD_WRITE_ATMESSAGE: URB busy\n");
return -EBUSY;
}
ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
ucs->dr_cmd_out.wValue = 0;
ucs->dr_cmd_out.wIndex = 0;
ucs->dr_cmd_out.wLength = cpu_to_le16(len);
usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
(unsigned char *) &ucs->dr_cmd_out, buf, len,
write_command_callback, cs);
rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
if (unlikely(rc)) {
update_basstate(ucs, 0, BS_ATWRPEND);
dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
get_usb_rcmsg(rc));
return rc;
}
/* submitted successfully, start timeout if necessary */
if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
ATRDY_TIMEOUT);
mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
}
return 0;
}
/* start_cbsend
* start transmission of AT command queue if necessary
* parameter:
* cs controller state structure
* return value:
* 0 on success
* error code < 0 on error
*/
static int start_cbsend(struct cardstate *cs)
{
struct cmdbuf_t *cb;
struct bas_cardstate *ucs = cs->hw.bas;
unsigned long flags;
int rc;
int retval = 0;
/* check if suspend requested */
if (ucs->basstate & BS_SUSPEND) {
gig_dbg(DEBUG_OUTPUT, "suspending");
return -EHOSTUNREACH;
}
/* check if AT channel is open */
if (!(ucs->basstate & BS_ATOPEN)) {
gig_dbg(DEBUG_OUTPUT, "AT channel not open");
rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
if (rc < 0) {
/* flush command queue */
spin_lock_irqsave(&cs->cmdlock, flags);
while (cs->cmdbuf != NULL)
complete_cb(cs);
spin_unlock_irqrestore(&cs->cmdlock, flags);
}
return rc;
}
/* try to send first command in queue */
spin_lock_irqsave(&cs->cmdlock, flags);
while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
ucs->retry_cmd_out = 0;
rc = atwrite_submit(cs, cb->buf, cb->len);
if (unlikely(rc)) {
retval = rc;
complete_cb(cs);
}
}
spin_unlock_irqrestore(&cs->cmdlock, flags);
return retval;
}
/* gigaset_write_cmd
* This function is called by the device independent part of the driver
* to transmit an AT command string to the Gigaset device.
* It encapsulates the device specific method for transmission over the
* direct USB connection to the base.
* The command string is added to the queue of commands to send, and
* USB transmission is started if necessary.
* parameters:
* cs controller state structure
* cb command buffer structure
* return value:
* number of bytes queued on success
* error code < 0 on error
*/
static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
{
unsigned long flags;
int rc;
gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
DEBUG_TRANSCMD : DEBUG_LOCKCMD,
"CMD Transmit", cb->len, cb->buf);
/* translate "+++" escape sequence sent as a single separate command
* into "close AT channel" command for error recovery
* The next command will reopen the AT channel automatically.
*/
if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
/* If an HD_RECEIVEATDATA_ACK message remains unhandled
* because of an error, the base never sends another one.
* The response channel is thus effectively blocked.
* Closing and reopening the AT channel does *not* clear
* this condition.
* As a stopgap measure, submit a zero-length AT read
* before closing the AT channel. This has the undocumented
* effect of triggering a new HD_RECEIVEATDATA_ACK message
* from the base if necessary.
* The subsequent AT channel close then discards any pending
* messages.
*/
spin_lock_irqsave(&cs->lock, flags);
if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
kfree(cs->hw.bas->rcvbuf);
cs->hw.bas->rcvbuf = NULL;
cs->hw.bas->rcvbuf_size = 0;
cs->hw.bas->retry_cmd_in = 0;
atread_submit(cs, 0);
}
spin_unlock_irqrestore(&cs->lock, flags);
rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
if (cb->wake_tasklet)
tasklet_schedule(cb->wake_tasklet);
if (!rc)
rc = cb->len;
kfree(cb);
return rc;
}
spin_lock_irqsave(&cs->cmdlock, flags);
cb->prev = cs->lastcmdbuf;
if (cs->lastcmdbuf)
cs->lastcmdbuf->next = cb;
else {
cs->cmdbuf = cb;
cs->curlen = cb->len;
}
cs->cmdbytes += cb->len;
cs->lastcmdbuf = cb;
spin_unlock_irqrestore(&cs->cmdlock, flags);
spin_lock_irqsave(&cs->lock, flags);
if (unlikely(!cs->connected)) {
spin_unlock_irqrestore(&cs->lock, flags);
gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
/* flush command queue */
spin_lock_irqsave(&cs->cmdlock, flags);
while (cs->cmdbuf != NULL)
complete_cb(cs);
spin_unlock_irqrestore(&cs->cmdlock, flags);
return -ENODEV;
}
rc = start_cbsend(cs);
spin_unlock_irqrestore(&cs->lock, flags);
return rc < 0 ? rc : cb->len;
}
/* gigaset_write_room
* tty_driver.write_room interface routine
* return number of characters the driver will accept to be written via
* gigaset_write_cmd
* parameter:
* controller state structure
* return value:
* number of characters
*/
static int gigaset_write_room(struct cardstate *cs)
{
return IF_WRITEBUF;
}
/* gigaset_chars_in_buffer
* 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;
}
/* gigaset_brkchars
* 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])
{
return -EINVAL;
}
/* Device Initialization/Shutdown */
/* ============================== */
/* Free hardware dependent part of the B channel structure
* parameter:
* bcs B channel structure
*/
static void gigaset_freebcshw(struct bc_state *bcs)
{
struct bas_bc_state *ubc = bcs->hw.bas;
int i;
if (!ubc)
return;
/* kill URBs and tasklets before freeing - better safe than sorry */
ubc->running = 0;
gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
for (i = 0; i < BAS_OUTURBS; ++i) {
usb_kill_urb(ubc->isoouturbs[i].urb);
usb_free_urb(ubc->isoouturbs[i].urb);
}
for (i = 0; i < BAS_INURBS; ++i) {
usb_kill_urb(ubc->isoinurbs[i]);
usb_free_urb(ubc->isoinurbs[i]);
}
tasklet_kill(&ubc->sent_tasklet);
tasklet_kill(&ubc->rcvd_tasklet);
kfree(ubc->isooutbuf);
kfree(ubc);
bcs->hw.bas = NULL;
}
/* Initialize hardware dependent part of the B channel structure
* parameter:
* bcs B channel structure
* return value:
* 0 on success, error code < 0 on failure
*/
static int gigaset_initbcshw(struct bc_state *bcs)
{
int i;
struct bas_bc_state *ubc;
bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
if (!ubc) {
pr_err("out of memory\n");
return -ENOMEM;
}
ubc->running = 0;
atomic_set(&ubc->corrbytes, 0);
spin_lock_init(&ubc->isooutlock);
for (i = 0; i < BAS_OUTURBS; ++i) {
ubc->isoouturbs[i].urb = NULL;
ubc->isoouturbs[i].bcs = bcs;
}
ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
ubc->numsub = 0;
ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
if (!ubc->isooutbuf) {
pr_err("out of memory\n");
kfree(ubc);
bcs->hw.bas = NULL;
return -ENOMEM;
}
tasklet_init(&ubc->sent_tasklet,
write_iso_tasklet, (unsigned long) bcs);
spin_lock_init(&ubc->isoinlock);
for (i = 0; i < BAS_INURBS; ++i)
ubc->isoinurbs[i] = NULL;
ubc->isoindone = NULL;
ubc->loststatus = -EINPROGRESS;
ubc->isoinlost = 0;
ubc->seqlen = 0;
ubc->inbyte = 0;
ubc->inbits = 0;
ubc->goodbytes = 0;
ubc->alignerrs = 0;
ubc->fcserrs = 0;
ubc->frameerrs = 0;
ubc->giants = 0;
ubc->runts = 0;
ubc->aborts = 0;
ubc->shared0s = 0;
ubc->stolen0s = 0;
tasklet_init(&ubc->rcvd_tasklet,
read_iso_tasklet, (unsigned long) bcs);
return 0;
}
static void gigaset_reinitbcshw(struct bc_state *bcs)
{
struct bas_bc_state *ubc = bcs->hw.bas;
bcs->hw.bas->running = 0;
atomic_set(&bcs->hw.bas->corrbytes, 0);
bcs->hw.bas->numsub = 0;
spin_lock_init(&ubc->isooutlock);
spin_lock_init(&ubc->isoinlock);
ubc->loststatus = -EINPROGRESS;
}
static void gigaset_freecshw(struct cardstate *cs)
{
/* timers, URBs and rcvbuf are disposed of in disconnect */
kfree(cs->hw.bas->int_in_buf);
kfree(cs->hw.bas);
cs->hw.bas = NULL;
}
/* Initialize hardware dependent part of the cardstate structure
* parameter:
* cs cardstate structure
* return value:
* 0 on success, error code < 0 on failure
*/
static int gigaset_initcshw(struct cardstate *cs)
{
struct bas_cardstate *ucs;
cs->hw.bas = ucs = kzalloc(sizeof(*ucs), GFP_KERNEL);
if (!ucs) {
pr_err("out of memory\n");
return -ENOMEM;
}
ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
if (!ucs->int_in_buf) {
kfree(ucs);
pr_err("out of memory\n");
return -ENOMEM;
}
spin_lock_init(&ucs->lock);
ucs->cs = cs;
timer_setup(&ucs->timer_ctrl, req_timeout, 0);
timer_setup(&ucs->timer_atrdy, atrdy_timeout, 0);
timer_setup(&ucs->timer_cmd_in, cmd_in_timeout, 0);
timer_setup(&ucs->timer_int_in, int_in_resubmit, 0);
init_waitqueue_head(&ucs->waitqueue);
INIT_WORK(&ucs->int_in_wq, int_in_work);
return 0;
}
/* freeurbs
* unlink and deallocate all URBs unconditionally
* caller must make sure that no commands are still in progress
* parameter:
* cs controller state structure
*/
static void freeurbs(struct cardstate *cs)
{
struct bas_cardstate *ucs = cs->hw.bas;
struct bas_bc_state *ubc;
int i, j;
gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
for (j = 0; j < BAS_CHANNELS; ++j) {
ubc = cs->bcs[j].hw.bas;
for (i = 0; i < BAS_OUTURBS; ++i) {
usb_kill_urb(ubc->isoouturbs[i].urb);
usb_free_urb(ubc->isoouturbs[i].urb);
ubc->isoouturbs[i].urb = NULL;
}
for (i = 0; i < BAS_INURBS; ++i) {
usb_kill_urb(ubc->isoinurbs[i]);
usb_free_urb(ubc->isoinurbs[i]);
ubc->isoinurbs[i] = NULL;
}
}
usb_kill_urb(ucs->urb_int_in);
usb_free_urb(ucs->urb_int_in);
ucs->urb_int_in = NULL;
usb_kill_urb(ucs->urb_cmd_out);
usb_free_urb(ucs->urb_cmd_out);
ucs->urb_cmd_out = NULL;
usb_kill_urb(ucs->urb_cmd_in);
usb_free_urb(ucs->urb_cmd_in);
ucs->urb_cmd_in = NULL;
usb_kill_urb(ucs->urb_ctrl);
usb_free_urb(ucs->urb_ctrl);
ucs->urb_ctrl = NULL;
}
/* gigaset_probe
* This function is called when a new USB device is connected.
* It checks whether the new device is handled by this driver.
*/
static int gigaset_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_host_interface *hostif;
struct usb_device *udev = interface_to_usbdev(interface);
struct cardstate *cs = NULL;
struct bas_cardstate *ucs = NULL;
struct bas_bc_state *ubc;
struct usb_endpoint_descriptor *endpoint;
int i, j;
int rc;
gig_dbg(DEBUG_INIT,
"%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
__func__, le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
/* set required alternate setting */
hostif = interface->cur_altsetting;
if (hostif->desc.bAlternateSetting != 3) {
gig_dbg(DEBUG_INIT,
"%s: wrong alternate setting %d - trying to switch",
__func__, hostif->desc.bAlternateSetting);
if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
< 0) {
dev_warn(&udev->dev, "usb_set_interface failed, "
"device %d interface %d altsetting %d\n",
udev->devnum, hostif->desc.bInterfaceNumber,
hostif->desc.bAlternateSetting);
return -ENODEV;
}
hostif = interface->cur_altsetting;
}
/* Reject application specific interfaces
*/
if (hostif->desc.bInterfaceClass != 255) {
dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
__func__, hostif->desc.bInterfaceClass);
return -ENODEV;
}
if (hostif->desc.bNumEndpoints < 1)
return -ENODEV;
dev_info(&udev->dev,
"%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
__func__, le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
/* allocate memory for our device state and initialize it */
cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
GIGASET_MODULENAME);
if (!cs)
return -ENODEV;
ucs = cs->hw.bas;
/* save off device structure ptrs for later use */
usb_get_dev(udev);
ucs->udev = udev;
ucs->interface = interface;
cs->dev = &interface->dev;
/* allocate URBs:
* - one for the interrupt pipe
* - three for the different uses of the default control pipe
* - three for each isochronous pipe
*/
if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
!(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
!(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
!(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
goto allocerr;
for (j = 0; j < BAS_CHANNELS; ++j) {
ubc = cs->bcs[j].hw.bas;
for (i = 0; i < BAS_OUTURBS; ++i)
if (!(ubc->isoouturbs[i].urb =
usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
goto allocerr;
for (i = 0; i < BAS_INURBS; ++i)
if (!(ubc->isoinurbs[i] =
usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
goto allocerr;
}
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
/* Fill the interrupt urb and send it to the core */
endpoint = &hostif->endpoint[0].desc;
usb_fill_int_urb(ucs->urb_int_in, udev,
usb_rcvintpipe(udev,
usb_endpoint_num(endpoint)),
ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
endpoint->bInterval);
rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
if (rc != 0) {
dev_err(cs->dev, "could not submit interrupt URB: %s\n",
get_usb_rcmsg(rc));
goto error;
}
ucs->retry_int_in = 0;
/* tell the device that the driver is ready */
rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
if (rc != 0)
goto error;
/* tell common part that the device is ready */
if (startmode == SM_LOCKED)
cs->mstate = MS_LOCKED;
/* save address of controller structure */
usb_set_intfdata(interface, cs);
rc = gigaset_start(cs);
if (rc < 0)
goto error;
return 0;
allocerr:
dev_err(cs->dev, "could not allocate URBs\n");
rc = -ENOMEM;
error:
freeurbs(cs);
usb_set_intfdata(interface, NULL);
usb_put_dev(udev);
gigaset_freecs(cs);
return rc;
}
/* gigaset_disconnect
* This function is called when the Gigaset base is unplugged.
*/
static void gigaset_disconnect(struct usb_interface *interface)
{
struct cardstate *cs;
struct bas_cardstate *ucs;
int j;
cs = usb_get_intfdata(interface);
ucs = cs->hw.bas;
dev_info(cs->dev, "disconnecting Gigaset base\n");
/* mark base as not ready, all channels disconnected */
ucs->basstate = 0;
/* tell LL all channels are down */
for (j = 0; j < BAS_CHANNELS; ++j)
gigaset_bchannel_down(cs->bcs + j);
/* stop driver (common part) */
gigaset_stop(cs);
/* stop delayed work and URBs, free ressources */
del_timer_sync(&ucs->timer_ctrl);
del_timer_sync(&ucs->timer_atrdy);
del_timer_sync(&ucs->timer_cmd_in);
del_timer_sync(&ucs->timer_int_in);
cancel_work_sync(&ucs->int_in_wq);
freeurbs(cs);
usb_set_intfdata(interface, NULL);
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
usb_put_dev(ucs->udev);
ucs->interface = NULL;
ucs->udev = NULL;
cs->dev = NULL;
gigaset_freecs(cs);
}
/* gigaset_suspend
* This function is called before the USB connection is suspended
* or before the USB device is reset.
* In the latter case, message == PMSG_ON.
*/
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
{
struct cardstate *cs = usb_get_intfdata(intf);
struct bas_cardstate *ucs = cs->hw.bas;
int rc;
/* set suspend flag; this stops AT command/response traffic */
if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
gig_dbg(DEBUG_SUSPEND, "already suspended");
return 0;
}
/* wait a bit for blocking conditions to go away */
rc = wait_event_timeout(ucs->waitqueue,
!(ucs->basstate &
(BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)),
BAS_TIMEOUT * HZ / 10);
gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
/* check for conditions preventing suspend */
if (ucs->basstate & (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)) {
dev_warn(cs->dev, "cannot suspend:\n");
if (ucs->basstate & BS_B1OPEN)
dev_warn(cs->dev, " B channel 1 open\n");
if (ucs->basstate & BS_B2OPEN)
dev_warn(cs->dev, " B channel 2 open\n");
if (ucs->basstate & BS_ATRDPEND)
dev_warn(cs->dev, " receiving AT reply\n");
if (ucs->basstate & BS_ATWRPEND)
dev_warn(cs->dev, " sending AT command\n");
update_basstate(ucs, 0, BS_SUSPEND);
return -EBUSY;
}
/* close AT channel if open */
if (ucs->basstate & BS_ATOPEN) {
gig_dbg(DEBUG_SUSPEND, "closing AT channel");
rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
if (rc) {
update_basstate(ucs, 0, BS_SUSPEND);
return rc;
}
wait_event_timeout(ucs->waitqueue, !ucs->pending,
BAS_TIMEOUT * HZ / 10);
/* in case of timeout, proceed anyway */
}
/* kill all URBs and delayed work that might still be pending */
usb_kill_urb(ucs->urb_ctrl);
usb_kill_urb(ucs->urb_int_in);
del_timer_sync(&ucs->timer_ctrl);
del_timer_sync(&ucs->timer_atrdy);
del_timer_sync(&ucs->timer_cmd_in);
del_timer_sync(&ucs->timer_int_in);
/* don't try to cancel int_in_wq from within reset as it
* might be the one requesting the reset
*/
if (message.event != PM_EVENT_ON)
cancel_work_sync(&ucs->int_in_wq);
gig_dbg(DEBUG_SUSPEND, "suspend complete");
return 0;
}
/* gigaset_resume
* This function is called after the USB connection has been resumed.
*/
static int gigaset_resume(struct usb_interface *intf)
{
struct cardstate *cs = usb_get_intfdata(intf);
struct bas_cardstate *ucs = cs->hw.bas;
int rc;
/* resubmit interrupt URB for spontaneous messages from base */
rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
if (rc) {
dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
get_usb_rcmsg(rc));
return rc;
}
ucs->retry_int_in = 0;
/* clear suspend flag to reallow activity */
update_basstate(ucs, 0, BS_SUSPEND);
gig_dbg(DEBUG_SUSPEND, "resume complete");
return 0;
}
/* gigaset_pre_reset
* This function is called before the USB connection is reset.
*/
static int gigaset_pre_reset(struct usb_interface *intf)
{
/* handle just like suspend */
return gigaset_suspend(intf, PMSG_ON);
}
/* gigaset_post_reset
* This function is called after the USB connection has been reset.
*/
static int gigaset_post_reset(struct usb_interface *intf)
{
/* FIXME: send HD_DEVICE_INIT_ACK? */
/* resume operations */
return gigaset_resume(intf);
}
static const struct gigaset_ops gigops = {
.write_cmd = gigaset_write_cmd,
.write_room = gigaset_write_room,
.chars_in_buffer = gigaset_chars_in_buffer,
.brkchars = gigaset_brkchars,
.init_bchannel = gigaset_init_bchannel,
.close_bchannel = gigaset_close_bchannel,
.initbcshw = gigaset_initbcshw,
.freebcshw = gigaset_freebcshw,
.reinitbcshw = gigaset_reinitbcshw,
.initcshw = gigaset_initcshw,
.freecshw = gigaset_freecshw,
.set_modem_ctrl = gigaset_set_modem_ctrl,
.baud_rate = gigaset_baud_rate,
.set_line_ctrl = gigaset_set_line_ctrl,
.send_skb = gigaset_isoc_send_skb,
.handle_input = gigaset_isoc_input,
};
/* bas_gigaset_init
* This function is called after the kernel module is loaded.
*/
static int __init bas_gigaset_init(void)
{
int result;
/* allocate memory for our driver state and initialize it */
driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
GIGASET_MODULENAME, GIGASET_DEVNAME,
&gigops, THIS_MODULE);
if (driver == NULL)
goto error;
/* register this driver with the USB subsystem */
result = usb_register(&gigaset_usb_driver);
if (result < 0) {
pr_err("error %d registering USB driver\n", -result);
goto error;
}
pr_info(DRIVER_DESC "\n");
return 0;
error:
if (driver)
gigaset_freedriver(driver);
driver = NULL;
return -1;
}
/* bas_gigaset_exit
* This function is called before the kernel module is unloaded.
*/
static void __exit bas_gigaset_exit(void)
{
struct bas_cardstate *ucs;
int i;
gigaset_blockdriver(driver); /* => probe will fail
* => no gigaset_start any more
*/
/* stop all connected devices */
for (i = 0; i < driver->minors; i++) {
if (gigaset_shutdown(driver->cs + i) < 0)
continue; /* no device */
/* from now on, no isdn callback should be possible */
/* close all still open channels */
ucs = driver->cs[i].hw.bas;
if (ucs->basstate & BS_B1OPEN) {
gig_dbg(DEBUG_INIT, "closing B1 channel");
usb_control_msg(ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
0, 0, NULL, 0, BAS_TIMEOUT);
}
if (ucs->basstate & BS_B2OPEN) {
gig_dbg(DEBUG_INIT, "closing B2 channel");
usb_control_msg(ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
0, 0, NULL, 0, BAS_TIMEOUT);
}
if (ucs->basstate & BS_ATOPEN) {
gig_dbg(DEBUG_INIT, "closing AT channel");
usb_control_msg(ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
0, 0, NULL, 0, BAS_TIMEOUT);
}
ucs->basstate = 0;
}
/* deregister this driver with the USB subsystem */
usb_deregister(&gigaset_usb_driver);
/* this will call the disconnect-callback */
/* from now on, no disconnect/probe callback should be running */
gigaset_freedriver(driver);
driver = NULL;
}
module_init(bas_gigaset_init);
module_exit(bas_gigaset_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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