X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fusb%2Fclass%2Fcdc-wdm.c;h=5a8ecc045e3facb1ae6abee89867d68cf63eabb4;hb=a27028349ccbcec9dde9d6dbba9d4017ad9ad5ab;hp=731db051070a82d63a5eeebe048c6ab314b92810;hpb=9b610fda0df5d0f0b0c64242e37441ad1b384aac;p=linux-2.6-omap-h63xx.git diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 731db051070..5a8ecc045e3 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -28,8 +28,9 @@ /* * Version Information */ -#define DRIVER_VERSION "v0.02" +#define DRIVER_VERSION "v0.03" #define DRIVER_AUTHOR "Oliver Neukum" +#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" static struct usb_device_id wdm_ids[] = { { @@ -41,6 +42,8 @@ static struct usb_device_id wdm_ids[] = { { } }; +MODULE_DEVICE_TABLE (usb, wdm_ids); + #define WDM_MINOR_BASE 176 @@ -87,6 +90,7 @@ struct wdm_device { dma_addr_t ihandle; struct mutex wlock; struct mutex rlock; + struct mutex plock; wait_queue_head_t wait; struct work_struct rxwork; int werr; @@ -130,10 +134,12 @@ static void wdm_in_callback(struct urb *urb) "nonzero urb status received: -ESHUTDOWN"); break; case -EPIPE: - err("nonzero urb status received: -EPIPE"); + dev_err(&desc->intf->dev, + "nonzero urb status received: -EPIPE\n"); break; default: - err("Unexpected error %d", status); + dev_err(&desc->intf->dev, + "Unexpected error %d\n", status); break; } } @@ -168,16 +174,18 @@ static void wdm_int_callback(struct urb *urb) return; /* unplug */ case -EPIPE: set_bit(WDM_INT_STALL, &desc->flags); - err("Stall on int endpoint"); + dev_err(&desc->intf->dev, "Stall on int endpoint\n"); goto sw; /* halt is cleared in work */ default: - err("nonzero urb status received: %d", status); + dev_err(&desc->intf->dev, + "nonzero urb status received: %d\n", status); break; } } if (urb->actual_length < sizeof(struct usb_cdc_notification)) { - err("wdm_int_callback - %d bytes", urb->actual_length); + dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", + urb->actual_length); goto exit; } @@ -196,7 +204,8 @@ static void wdm_int_callback(struct urb *urb) goto exit; default: clear_bit(WDM_POLL_RUNNING, &desc->flags); - err("unknown notification %d received: index %d len %d", + dev_err(&desc->intf->dev, + "unknown notification %d received: index %d len %d\n", dr->bNotificationType, dr->wIndex, dr->wLength); goto exit; } @@ -205,7 +214,7 @@ static void wdm_int_callback(struct urb *urb) req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; req->wValue = 0; req->wIndex = desc->inum; - req->wLength = cpu_to_le16(desc->bMaxPacketSize0); + req->wLength = cpu_to_le16(desc->wMaxCommand); usb_fill_control_urb( desc->response, @@ -214,7 +223,7 @@ static void wdm_int_callback(struct urb *urb) usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), (unsigned char *)req, desc->inbuf, - desc->bMaxPacketSize0, + desc->wMaxCommand, wdm_in_callback, desc ); @@ -234,19 +243,22 @@ static void wdm_int_callback(struct urb *urb) sw: rv = schedule_work(&desc->rxwork); if (rv) - err("Cannot schedule work"); + dev_err(&desc->intf->dev, + "Cannot schedule work\n"); } } exit: rv = usb_submit_urb(urb, GFP_ATOMIC); if (rv) - err("%s - usb_submit_urb failed with result %d", - __func__, rv); + dev_err(&desc->intf->dev, + "%s - usb_submit_urb failed with result %d\n", + __func__, rv); } static void kill_urbs(struct wdm_device *desc) { + /* the order here is essential */ usb_kill_urb(desc->command); usb_kill_urb(desc->validity); usb_kill_urb(desc->response); @@ -266,7 +278,7 @@ static void cleanup(struct wdm_device *desc) desc->sbuf, desc->validity->transfer_dma); usb_buffer_free(interface_to_usbdev(desc->intf), - desc->wMaxPacketSize, + desc->wMaxCommand, desc->inbuf, desc->response->transfer_dma); kfree(desc->orq); @@ -299,6 +311,9 @@ static ssize_t wdm_write if (r) goto outnl; + r = usb_autopm_get_interface(desc->intf); + if (r < 0) + goto outnp; r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); if (r < 0) @@ -347,11 +362,14 @@ static ssize_t wdm_write if (rv < 0) { kfree(buf); clear_bit(WDM_IN_USE, &desc->flags); + dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); } else { dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", req->wIndex); } out: + usb_autopm_put_interface(desc->intf); +outnp: mutex_unlock(&desc->wlock); outnl: return rv < 0 ? rv : count; @@ -376,6 +394,11 @@ retry: rv = wait_event_interruptible(desc->wait, test_bit(WDM_READ, &desc->flags)); + if (test_bit(WDM_DISCONNECTING, &desc->flags)) { + rv = -ENODEV; + goto err; + } + usb_mark_last_busy(interface_to_usbdev(desc->intf)); if (rv < 0) { rv = -ERESTARTSYS; goto err; @@ -387,7 +410,8 @@ retry: int t = desc->rerr; desc->rerr = 0; spin_unlock_irq(&desc->iuspin); - err("reading had resulted in %d", t); + dev_err(&desc->intf->dev, + "reading had resulted in %d\n", t); rv = -EIO; goto err; } @@ -418,12 +442,15 @@ retry: desc->ubuf[i] = desc->ubuf[i + cntr]; desc->length -= cntr; + /* in case we had outstanding data */ + if (!desc->length) + clear_bit(WDM_READ, &desc->flags); rv = cntr; err: mutex_unlock(&desc->rlock); if (rv < 0) - err("wdm_read: exit error"); + dev_err(&desc->intf->dev, "wdm_read: exit error\n"); return rv; } @@ -433,7 +460,8 @@ static int wdm_flush(struct file *file, fl_owner_t id) wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); if (desc->werr < 0) - err("Error in flush path: %d", desc->werr); + dev_err(&desc->intf->dev, "Error in flush path: %d\n", + desc->werr); return desc->werr; } @@ -480,18 +508,29 @@ static int wdm_open(struct inode *inode, struct file *file) if (test_bit(WDM_DISCONNECTING, &desc->flags)) goto out; - desc->count++; + ; file->private_data = desc; - rv = usb_submit_urb(desc->validity, GFP_KERNEL); - + rv = usb_autopm_get_interface(desc->intf); if (rv < 0) { - desc->count--; - err("Error submitting int urb - %d", rv); + dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); goto out; } - rv = 0; + intf->needs_remote_wakeup = 1; + mutex_lock(&desc->plock); + if (!desc->count++) { + rv = usb_submit_urb(desc->validity, GFP_KERNEL); + if (rv < 0) { + desc->count--; + dev_err(&desc->intf->dev, + "Error submitting int urb - %d\n", rv); + } + } else { + rv = 0; + } + mutex_unlock(&desc->plock); + usb_autopm_put_interface(desc->intf); out: mutex_unlock(&wdm_mutex); return rv; @@ -502,10 +541,15 @@ static int wdm_release(struct inode *inode, struct file *file) struct wdm_device *desc = file->private_data; mutex_lock(&wdm_mutex); + mutex_lock(&desc->plock); desc->count--; + mutex_unlock(&desc->plock); + if (!desc->count) { dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); kill_urbs(desc); + if (!test_bit(WDM_DISCONNECTING, &desc->flags)) + desc->intf->needs_remote_wakeup = 0; } mutex_unlock(&wdm_mutex); return 0; @@ -568,7 +612,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) while (buflen > 0) { if (buffer [1] != USB_DT_CS_INTERFACE) { - err("skipping garbage"); + dev_err(&intf->dev, "skipping garbage\n"); goto next_desc; } @@ -582,7 +626,8 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) "Finding maximum buffer length: %d", maxcom); break; default: - err("Ignoring extra header, type %d, length %d", + dev_err(&intf->dev, + "Ignoring extra header, type %d, length %d\n", buffer[2], buffer[0]); break; } @@ -597,6 +642,7 @@ next_desc: goto out; mutex_init(&desc->wlock); mutex_init(&desc->rlock); + mutex_init(&desc->plock); spin_lock_init(&desc->iuspin); init_waitqueue_head(&desc->wait); desc->wMaxCommand = maxcom; @@ -698,6 +744,7 @@ static void wdm_disconnect(struct usb_interface *intf) spin_lock_irqsave(&desc->iuspin, flags); set_bit(WDM_DISCONNECTING, &desc->flags); set_bit(WDM_READ, &desc->flags); + /* to terminate pending flushes */ clear_bit(WDM_IN_USE, &desc->flags); spin_unlock_irqrestore(&desc->iuspin, flags); cancel_work_sync(&desc->rxwork); @@ -708,11 +755,82 @@ static void wdm_disconnect(struct usb_interface *intf) mutex_unlock(&wdm_mutex); } +static int wdm_suspend(struct usb_interface *intf, pm_message_t message) +{ + struct wdm_device *desc = usb_get_intfdata(intf); + int rv = 0; + + dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); + + mutex_lock(&desc->plock); +#ifdef CONFIG_PM + if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) { + rv = -EBUSY; + } else { +#endif + cancel_work_sync(&desc->rxwork); + kill_urbs(desc); +#ifdef CONFIG_PM + } +#endif + mutex_unlock(&desc->plock); + + return rv; +} + +static int recover_from_urb_loss(struct wdm_device *desc) +{ + int rv = 0; + + if (desc->count) { + rv = usb_submit_urb(desc->validity, GFP_NOIO); + if (rv < 0) + dev_err(&desc->intf->dev, + "Error resume submitting int urb - %d\n", rv); + } + return rv; +} +static int wdm_resume(struct usb_interface *intf) +{ + struct wdm_device *desc = usb_get_intfdata(intf); + int rv; + + dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); + mutex_lock(&desc->plock); + rv = recover_from_urb_loss(desc); + mutex_unlock(&desc->plock); + return rv; +} + +static int wdm_pre_reset(struct usb_interface *intf) +{ + struct wdm_device *desc = usb_get_intfdata(intf); + + mutex_lock(&desc->plock); + return 0; +} + +static int wdm_post_reset(struct usb_interface *intf) +{ + struct wdm_device *desc = usb_get_intfdata(intf); + int rv; + + rv = recover_from_urb_loss(desc); + mutex_unlock(&desc->plock); + return 0; +} + static struct usb_driver wdm_driver = { .name = "cdc_wdm", .probe = wdm_probe, .disconnect = wdm_disconnect, + .suspend = wdm_suspend, + .resume = wdm_resume, + .reset_resume = wdm_resume, + .pre_reset = wdm_pre_reset, + .post_reset = wdm_post_reset, .id_table = wdm_ids, + .supports_autosuspend = 1, }; /* --- low level module stuff --- */ @@ -735,6 +853,5 @@ module_init(wdm_init); module_exit(wdm_exit); MODULE_AUTHOR(DRIVER_AUTHOR); -MODULE_DESCRIPTION("USB Abstract Control Model driver for " - "USB WCM Device Management"); +MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL");