bas_gigaset: suspend support
Add basic suspend/resume support to the bas_gigaset ISDN driver for the Siemens Gigaset SX255 series of ISDN DECT bases. Only the USB aspects are handled so far; the ISDN subsystem is not notified in any way, for lack of information about how to do that. The driver will refuse to suspend if a connection is active. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: Greg KH <gregkh@suse.de> Cc: Hansjoerg Lipp <hjlipp@web.de> Cc: Karsten Keil <kkeil@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tilman Schmidt
Linus Torvalds
parent
c652cbd8ee
commit
024fd299ba
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@ -73,6 +73,14 @@ static int gigaset_probe(struct usb_interface *interface,
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/* Function will be called if the device is unplugged */
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static void gigaset_disconnect(struct usb_interface *interface);
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/* functions called before/after suspend */
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static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
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static int gigaset_resume(struct usb_interface *intf);
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/* functions called before/after device reset */
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static int gigaset_pre_reset(struct usb_interface *intf);
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static int gigaset_post_reset(struct usb_interface *intf);
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static int atread_submit(struct cardstate *, int);
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static void stopurbs(struct bas_bc_state *);
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static int req_submit(struct bc_state *, int, int, int);
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@ -107,6 +115,7 @@ struct bas_cardstate {
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spinlock_t lock; /* locks all following */
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atomic_t basstate; /* bitmap (BS_*) */
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int pending; /* uncompleted base request */
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wait_queue_head_t waitqueue;
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int rcvbuf_size; /* size of AT receive buffer */
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/* 0: no receive in progress */
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int retry_cmd_in; /* receive req retry count */
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@ -121,6 +130,7 @@ struct bas_cardstate {
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#define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
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#define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
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#define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
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#define BS_SUSPEND 0x100 /* USB port suspended */
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static struct gigaset_driver *driver = NULL;
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@ -132,6 +142,11 @@ static struct usb_driver gigaset_usb_driver = {
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.probe = gigaset_probe,
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.disconnect = gigaset_disconnect,
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.id_table = gigaset_table,
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.suspend = gigaset_suspend,
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.resume = gigaset_resume,
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.reset_resume = gigaset_post_reset,
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.pre_reset = gigaset_pre_reset,
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.post_reset = gigaset_post_reset,
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};
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/* get message text for usb_submit_urb return code
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@ -465,6 +480,7 @@ static void read_ctrl_callback(struct urb *urb)
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int rc;
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update_basstate(ucs, 0, BS_ATRDPEND);
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wake_up(&ucs->waitqueue);
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if (!ucs->rcvbuf_size) {
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dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
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@ -551,17 +567,28 @@ static void read_ctrl_callback(struct urb *urb)
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static int atread_submit(struct cardstate *cs, int timeout)
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{
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struct bas_cardstate *ucs = cs->hw.bas;
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int basstate;
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int ret;
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gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
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ucs->rcvbuf_size);
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if (update_basstate(ucs, BS_ATRDPEND, 0) & BS_ATRDPEND) {
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basstate = update_basstate(ucs, BS_ATRDPEND, 0);
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if (basstate & BS_ATRDPEND) {
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dev_err(cs->dev,
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"could not submit HD_READ_ATMESSAGE: URB busy\n");
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return -EBUSY;
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}
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if (basstate & BS_SUSPEND) {
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dev_notice(cs->dev,
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"HD_READ_ATMESSAGE not submitted, "
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"suspend in progress\n");
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update_basstate(ucs, 0, BS_ATRDPEND);
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/* treat like disconnect */
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return -ENODEV;
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}
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ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
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ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
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ucs->dr_cmd_in.wValue = 0;
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@ -747,6 +774,7 @@ static void read_int_callback(struct urb *urb)
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}
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check_pending(ucs);
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wake_up(&ucs->waitqueue);
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resubmit:
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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@ -1416,6 +1444,8 @@ static void req_timeout(unsigned long data)
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dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
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pending);
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}
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wake_up(&ucs->waitqueue);
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}
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/* write_ctrl_callback
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@ -1456,7 +1486,9 @@ static void write_ctrl_callback(struct urb *urb)
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break;
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default: /* any failure */
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if (++ucs->retry_ctrl > BAS_RETRY) {
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/* don't retry if suspend requested */
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if (++ucs->retry_ctrl > BAS_RETRY ||
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(atomic_read(&ucs->basstate) & BS_SUSPEND)) {
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dev_err(&ucs->interface->dev,
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"control request 0x%02x failed: %s\n",
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ucs->dr_ctrl.bRequest,
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@ -1485,6 +1517,7 @@ static void write_ctrl_callback(struct urb *urb)
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del_timer(&ucs->timer_ctrl);
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ucs->pending = 0;
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spin_unlock_irqrestore(&ucs->lock, flags);
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wake_up(&ucs->waitqueue);
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}
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/* req_submit
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@ -1570,6 +1603,14 @@ static int gigaset_init_bchannel(struct bc_state *bcs)
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return -ENODEV;
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}
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if (atomic_read(&cs->hw.bas->basstate) & BS_SUSPEND) {
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dev_notice(cs->dev,
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"not starting isochronous I/O, "
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"suspend in progress\n");
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spin_unlock_irqrestore(&cs->lock, flags);
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return -EHOSTUNREACH;
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}
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if ((ret = starturbs(bcs)) < 0) {
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dev_err(cs->dev,
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"could not start isochronous I/O for channel B%d: %s\n",
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@ -1682,6 +1723,7 @@ static void write_command_callback(struct urb *urb)
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unsigned long flags;
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update_basstate(ucs, 0, BS_ATWRPEND);
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wake_up(&ucs->waitqueue);
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/* check status */
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switch (status) {
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@ -1705,6 +1747,13 @@ static void write_command_callback(struct urb *urb)
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ucs->retry_cmd_out);
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break;
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}
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if (atomic_read(&ucs->basstate) & BS_SUSPEND) {
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dev_warn(cs->dev,
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"command write: %s, "
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"won't retry - suspend requested\n",
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get_usb_statmsg(status));
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break;
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}
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if (cs->cmdbuf == NULL) {
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dev_warn(cs->dev,
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"command write: %s, "
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@ -1813,6 +1862,12 @@ static int start_cbsend(struct cardstate *cs)
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int rc;
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int retval = 0;
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/* check if suspend requested */
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if (atomic_read(&ucs->basstate) & BS_SUSPEND) {
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gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
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return -EHOSTUNREACH;
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}
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/* check if AT channel is open */
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if (!(atomic_read(&ucs->basstate) & BS_ATOPEN)) {
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gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
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@ -2099,6 +2154,7 @@ static int gigaset_initcshw(struct cardstate *cs)
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init_timer(&ucs->timer_ctrl);
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init_timer(&ucs->timer_atrdy);
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init_timer(&ucs->timer_cmd_in);
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init_waitqueue_head(&ucs->waitqueue);
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return 1;
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}
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@ -2311,6 +2367,112 @@ static void gigaset_disconnect(struct usb_interface *interface)
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gigaset_unassign(cs);
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}
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/* gigaset_suspend
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* This function is called before the USB connection is suspended.
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*/
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static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct cardstate *cs = usb_get_intfdata(intf);
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struct bas_cardstate *ucs = cs->hw.bas;
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int basstate;
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int rc;
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/* set suspend flag; this stops AT command/response traffic */
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if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
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gig_dbg(DEBUG_SUSPEND, "already suspended");
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return 0;
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}
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/* wait a bit for blocking conditions to go away */
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rc = wait_event_timeout(ucs->waitqueue,
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!(atomic_read(&ucs->basstate) &
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(BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
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BAS_TIMEOUT*HZ/10);
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gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
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/* check for conditions preventing suspend */
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basstate = atomic_read(&ucs->basstate);
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if (basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
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dev_warn(cs->dev, "cannot suspend:\n");
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if (basstate & BS_B1OPEN)
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dev_warn(cs->dev, " B channel 1 open\n");
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if (basstate & BS_B2OPEN)
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dev_warn(cs->dev, " B channel 2 open\n");
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if (basstate & BS_ATRDPEND)
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dev_warn(cs->dev, " receiving AT reply\n");
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if (basstate & BS_ATWRPEND)
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dev_warn(cs->dev, " sending AT command\n");
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update_basstate(ucs, 0, BS_SUSPEND);
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return -EBUSY;
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}
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/* close AT channel if open */
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if (basstate & BS_ATOPEN) {
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gig_dbg(DEBUG_SUSPEND, "closing AT channel");
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rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
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if (rc) {
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update_basstate(ucs, 0, BS_SUSPEND);
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return rc;
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}
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wait_event_timeout(ucs->waitqueue, !ucs->pending,
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BAS_TIMEOUT*HZ/10);
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/* in case of timeout, proceed anyway */
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}
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/* kill all URBs and timers that might still be pending */
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usb_kill_urb(ucs->urb_ctrl);
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usb_kill_urb(ucs->urb_int_in);
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del_timer_sync(&ucs->timer_ctrl);
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gig_dbg(DEBUG_SUSPEND, "suspend complete");
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return 0;
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}
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/* gigaset_resume
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* This function is called after the USB connection has been resumed.
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*/
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static int gigaset_resume(struct usb_interface *intf)
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{
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struct cardstate *cs = usb_get_intfdata(intf);
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struct bas_cardstate *ucs = cs->hw.bas;
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int rc;
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/* resubmit interrupt URB for spontaneous messages from base */
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rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
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if (rc) {
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dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
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get_usb_rcmsg(rc));
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return rc;
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}
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/* clear suspend flag to reallow activity */
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update_basstate(ucs, 0, BS_SUSPEND);
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gig_dbg(DEBUG_SUSPEND, "resume complete");
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return 0;
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}
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/* gigaset_pre_reset
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* This function is called before the USB connection is reset.
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*/
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static int gigaset_pre_reset(struct usb_interface *intf)
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{
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/* handle just like suspend */
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return gigaset_suspend(intf, PMSG_ON);
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}
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/* gigaset_post_reset
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* This function is called after the USB connection has been reset.
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*/
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static int gigaset_post_reset(struct usb_interface *intf)
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{
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/* FIXME: send HD_DEVICE_INIT_ACK? */
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/* resume operations */
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return gigaset_resume(intf);
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}
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static const struct gigaset_ops gigops = {
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gigaset_write_cmd,
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gigaset_write_room,
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