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drivers/usb/class/cdc-wdm.c
25.7 KB
afba937e5 USB: CDC WDM driver |
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/* * cdc-wdm.c * * This driver supports USB CDC WCM Device Management. * |
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* Copyright (c) 2007-2009 Oliver Neukum |
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* * Some code taken from cdc-acm.c * * Released under the GPLv2. * * Many thanks to Carl Nordbeck */ #include <linux/kernel.h> #include <linux/errno.h> |
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#include <linux/ioctl.h> |
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#include <linux/slab.h> #include <linux/module.h> |
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#include <linux/mutex.h> #include <linux/uaccess.h> #include <linux/bitops.h> #include <linux/poll.h> #include <linux/usb.h> #include <linux/usb/cdc.h> #include <asm/byteorder.h> #include <asm/unaligned.h> |
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#include <linux/usb/cdc-wdm.h> |
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/* * Version Information */ |
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#define DRIVER_VERSION "v0.03" |
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#define DRIVER_AUTHOR "Oliver Neukum" |
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#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
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|
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static const struct usb_device_id wdm_ids[] = { |
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{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS, .bInterfaceClass = USB_CLASS_COMM, .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM }, { } }; |
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MODULE_DEVICE_TABLE (usb, wdm_ids); |
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#define WDM_MINOR_BASE 176 #define WDM_IN_USE 1 #define WDM_DISCONNECTING 2 #define WDM_RESULT 3 #define WDM_READ 4 #define WDM_INT_STALL 5 #define WDM_POLL_RUNNING 6 |
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#define WDM_RESPONDING 7 |
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#define WDM_SUSPENDING 8 |
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#define WDM_RESETTING 9 |
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#define WDM_OVERFLOW 10 |
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#define WDM_MAX 16 |
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/* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */ #define WDM_DEFAULT_BUFSIZE 256 |
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static DEFINE_MUTEX(wdm_mutex); |
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static DEFINE_SPINLOCK(wdm_device_list_lock); static LIST_HEAD(wdm_device_list); |
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/* --- method tables --- */ struct wdm_device { u8 *inbuf; /* buffer for response */ u8 *outbuf; /* buffer for command */ u8 *sbuf; /* buffer for status */ u8 *ubuf; /* buffer for copy to user space */ struct urb *command; struct urb *response; struct urb *validity; struct usb_interface *intf; struct usb_ctrlrequest *orq; struct usb_ctrlrequest *irq; spinlock_t iuspin; unsigned long flags; u16 bufsize; u16 wMaxCommand; u16 wMaxPacketSize; |
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__le16 inum; int reslength; int length; int read; int count; dma_addr_t shandle; dma_addr_t ihandle; |
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struct mutex wlock; struct mutex rlock; |
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wait_queue_head_t wait; struct work_struct rxwork; int werr; int rerr; |
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int resp_count; |
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struct list_head device_list; |
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int (*manage_power)(struct usb_interface *, int); |
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}; static struct usb_driver wdm_driver; |
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/* return intfdata if we own the interface, else look up intf in the list */ static struct wdm_device *wdm_find_device(struct usb_interface *intf) { |
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struct wdm_device *desc; |
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spin_lock(&wdm_device_list_lock); list_for_each_entry(desc, &wdm_device_list, device_list) if (desc->intf == intf) |
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goto found; desc = NULL; found: |
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spin_unlock(&wdm_device_list_lock); return desc; } static struct wdm_device *wdm_find_device_by_minor(int minor) { |
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struct wdm_device *desc; |
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spin_lock(&wdm_device_list_lock); list_for_each_entry(desc, &wdm_device_list, device_list) if (desc->intf->minor == minor) |
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goto found; desc = NULL; found: |
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spin_unlock(&wdm_device_list_lock); return desc; } |
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/* --- callbacks --- */ static void wdm_out_callback(struct urb *urb) { struct wdm_device *desc; desc = urb->context; spin_lock(&desc->iuspin); desc->werr = urb->status; spin_unlock(&desc->iuspin); |
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kfree(desc->outbuf); |
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desc->outbuf = NULL; clear_bit(WDM_IN_USE, &desc->flags); |
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wake_up(&desc->wait); } static void wdm_in_callback(struct urb *urb) { struct wdm_device *desc = urb->context; int status = urb->status; |
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int length = urb->actual_length; |
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spin_lock(&desc->iuspin); |
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clear_bit(WDM_RESPONDING, &desc->flags); |
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if (status) { switch (status) { case -ENOENT: dev_dbg(&desc->intf->dev, "nonzero urb status received: -ENOENT"); |
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goto skip_error; |
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case -ECONNRESET: dev_dbg(&desc->intf->dev, "nonzero urb status received: -ECONNRESET"); |
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goto skip_error; |
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case -ESHUTDOWN: dev_dbg(&desc->intf->dev, "nonzero urb status received: -ESHUTDOWN"); |
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goto skip_error; |
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case -EPIPE: |
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dev_err(&desc->intf->dev, "nonzero urb status received: -EPIPE "); |
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break; default: |
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dev_err(&desc->intf->dev, "Unexpected error %d ", status); |
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break; } } desc->rerr = status; |
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if (length + desc->length > desc->wMaxCommand) { /* The buffer would overflow */ set_bit(WDM_OVERFLOW, &desc->flags); } else { /* we may already be in overflow */ if (!test_bit(WDM_OVERFLOW, &desc->flags)) { memmove(desc->ubuf + desc->length, desc->inbuf, length); desc->length += length; desc->reslength = length; } } |
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skip_error: |
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wake_up(&desc->wait); set_bit(WDM_READ, &desc->flags); spin_unlock(&desc->iuspin); } static void wdm_int_callback(struct urb *urb) { int rv = 0; |
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int responding; |
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int status = urb->status; struct wdm_device *desc; |
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struct usb_cdc_notification *dr; desc = urb->context; |
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dr = (struct usb_cdc_notification *)desc->sbuf; if (status) { switch (status) { case -ESHUTDOWN: case -ENOENT: case -ECONNRESET: return; /* unplug */ case -EPIPE: set_bit(WDM_INT_STALL, &desc->flags); |
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dev_err(&desc->intf->dev, "Stall on int endpoint "); |
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goto sw; /* halt is cleared in work */ default: |
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dev_err(&desc->intf->dev, "nonzero urb status received: %d ", status); |
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break; } } if (urb->actual_length < sizeof(struct usb_cdc_notification)) { |
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dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes ", urb->actual_length); |
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goto exit; } switch (dr->bNotificationType) { case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: dev_dbg(&desc->intf->dev, "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", dr->wIndex, dr->wLength); break; case USB_CDC_NOTIFY_NETWORK_CONNECTION: dev_dbg(&desc->intf->dev, "NOTIFY_NETWORK_CONNECTION %s network", dr->wValue ? "connected to" : "disconnected from"); goto exit; |
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case USB_CDC_NOTIFY_SPEED_CHANGE: dev_dbg(&desc->intf->dev, "SPEED_CHANGE received (len %u)", urb->actual_length); goto exit; |
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default: clear_bit(WDM_POLL_RUNNING, &desc->flags); |
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dev_err(&desc->intf->dev, "unknown notification %d received: index %d len %d ", |
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dr->bNotificationType, dr->wIndex, dr->wLength); goto exit; } |
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spin_lock(&desc->iuspin); |
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responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
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if (!desc->resp_count++ && !responding && !test_bit(WDM_DISCONNECTING, &desc->flags) |
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&& !test_bit(WDM_SUSPENDING, &desc->flags)) { |
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rv = usb_submit_urb(desc->response, GFP_ATOMIC); dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", __func__, rv); } spin_unlock(&desc->iuspin); if (rv < 0) { |
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clear_bit(WDM_RESPONDING, &desc->flags); |
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if (rv == -EPERM) return; if (rv == -ENOMEM) { sw: rv = schedule_work(&desc->rxwork); if (rv) |
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dev_err(&desc->intf->dev, "Cannot schedule work "); |
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} } exit: rv = usb_submit_urb(urb, GFP_ATOMIC); if (rv) |
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dev_err(&desc->intf->dev, "%s - usb_submit_urb failed with result %d ", __func__, rv); |
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} static void kill_urbs(struct wdm_device *desc) { |
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/* the order here is essential */ |
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usb_kill_urb(desc->command); usb_kill_urb(desc->validity); usb_kill_urb(desc->response); } static void free_urbs(struct wdm_device *desc) { usb_free_urb(desc->validity); usb_free_urb(desc->response); usb_free_urb(desc->command); } static void cleanup(struct wdm_device *desc) { |
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kfree(desc->sbuf); kfree(desc->inbuf); |
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kfree(desc->orq); kfree(desc->irq); kfree(desc->ubuf); free_urbs(desc); kfree(desc); } static ssize_t wdm_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { u8 *buf; int rv = -EMSGSIZE, r, we; struct wdm_device *desc = file->private_data; struct usb_ctrlrequest *req; if (count > desc->wMaxCommand) count = desc->wMaxCommand; spin_lock_irq(&desc->iuspin); we = desc->werr; desc->werr = 0; spin_unlock_irq(&desc->iuspin); if (we < 0) return -EIO; |
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buf = kmalloc(count, GFP_KERNEL); |
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if (!buf) { rv = -ENOMEM; goto outnl; } r = copy_from_user(buf, buffer, count); if (r > 0) { kfree(buf); rv = -EFAULT; goto outnl; } /* concurrent writes and disconnect */ |
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r = mutex_lock_interruptible(&desc->wlock); |
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rv = -ERESTARTSYS; |
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if (r) { kfree(buf); |
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goto outnl; |
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} if (test_bit(WDM_DISCONNECTING, &desc->flags)) { kfree(buf); rv = -ENODEV; goto outnp; } |
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|
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r = usb_autopm_get_interface(desc->intf); |
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if (r < 0) { kfree(buf); |
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rv = usb_translate_errors(r); |
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goto outnp; |
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} |
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|
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if (!(file->f_flags & O_NONBLOCK)) |
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r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); else if (test_bit(WDM_IN_USE, &desc->flags)) r = -EAGAIN; |
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if (test_bit(WDM_RESETTING, &desc->flags)) r = -EIO; |
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if (r < 0) { |
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kfree(buf); |
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rv = r; |
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goto out; } req = desc->orq; usb_fill_control_urb( desc->command, interface_to_usbdev(desc->intf), /* using common endpoint 0 */ usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), (unsigned char *)req, buf, count, wdm_out_callback, desc ); req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE); req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; req->wValue = 0; req->wIndex = desc->inum; req->wLength = cpu_to_le16(count); set_bit(WDM_IN_USE, &desc->flags); |
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desc->outbuf = buf; |
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rv = usb_submit_urb(desc->command, GFP_KERNEL); if (rv < 0) { kfree(buf); |
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desc->outbuf = NULL; |
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clear_bit(WDM_IN_USE, &desc->flags); |
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dev_err(&desc->intf->dev, "Tx URB error: %d ", rv); |
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rv = usb_translate_errors(rv); |
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} else { dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", req->wIndex); } out: |
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usb_autopm_put_interface(desc->intf); outnp: |
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mutex_unlock(&desc->wlock); |
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outnl: return rv < 0 ? rv : count; } |
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/* * clear WDM_READ flag and possibly submit the read urb if resp_count * is non-zero. * * Called with desc->iuspin locked */ static int clear_wdm_read_flag(struct wdm_device *desc) { int rv = 0; clear_bit(WDM_READ, &desc->flags); /* submit read urb only if the device is waiting for it */ |
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if (!desc->resp_count || !--desc->resp_count) |
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goto out; set_bit(WDM_RESPONDING, &desc->flags); spin_unlock_irq(&desc->iuspin); rv = usb_submit_urb(desc->response, GFP_KERNEL); spin_lock_irq(&desc->iuspin); if (rv) { dev_err(&desc->intf->dev, "usb_submit_urb failed with result %d ", rv); /* make sure the next notification trigger a submit */ clear_bit(WDM_RESPONDING, &desc->flags); desc->resp_count = 0; } out: return rv; } |
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static ssize_t wdm_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) { |
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int rv, cntr; |
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int i = 0; struct wdm_device *desc = file->private_data; |
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rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ |
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if (rv < 0) return -ERESTARTSYS; |
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cntr = ACCESS_ONCE(desc->length); if (cntr == 0) { |
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desc->read = 0; retry: |
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if (test_bit(WDM_DISCONNECTING, &desc->flags)) { rv = -ENODEV; goto err; } |
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if (test_bit(WDM_OVERFLOW, &desc->flags)) { clear_bit(WDM_OVERFLOW, &desc->flags); rv = -ENOBUFS; goto err; } |
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i++; |
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if (file->f_flags & O_NONBLOCK) { if (!test_bit(WDM_READ, &desc->flags)) { rv = cntr ? cntr : -EAGAIN; goto err; } rv = 0; } else { rv = wait_event_interruptible(desc->wait, test_bit(WDM_READ, &desc->flags)); } |
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|
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/* may have happened while we slept */ |
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if (test_bit(WDM_DISCONNECTING, &desc->flags)) { rv = -ENODEV; goto err; } |
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if (test_bit(WDM_RESETTING, &desc->flags)) { rv = -EIO; goto err; } |
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usb_mark_last_busy(interface_to_usbdev(desc->intf)); |
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if (rv < 0) { rv = -ERESTARTSYS; goto err; } spin_lock_irq(&desc->iuspin); if (desc->rerr) { /* read completed, error happened */ |
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desc->rerr = 0; spin_unlock_irq(&desc->iuspin); |
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rv = -EIO; goto err; } /* * recheck whether we've lost the race * against the completion handler */ if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ spin_unlock_irq(&desc->iuspin); goto retry; } |
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|
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if (!desc->reslength) { /* zero length read */ |
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dev_dbg(&desc->intf->dev, "%s: zero length - clearing WDM_READ ", __func__); |
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rv = clear_wdm_read_flag(desc); |
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spin_unlock_irq(&desc->iuspin); |
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if (rv < 0) goto err; |
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goto retry; } |
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cntr = desc->length; |
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spin_unlock_irq(&desc->iuspin); } |
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if (cntr > count) cntr = count; |
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rv = copy_to_user(buffer, desc->ubuf, cntr); if (rv > 0) { rv = -EFAULT; goto err; } |
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spin_lock_irq(&desc->iuspin); |
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for (i = 0; i < desc->length - cntr; i++) desc->ubuf[i] = desc->ubuf[i + cntr]; desc->length -= cntr; |
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557 |
/* in case we had outstanding data */ |
8dd5cd539 usb: cdc-wdm: avo... |
558 559 560 |
if (!desc->length) clear_wdm_read_flag(desc); spin_unlock_irq(&desc->iuspin); |
afba937e5 USB: CDC WDM driver |
561 562 563 |
rv = cntr; err: |
e8537bd2c USB: cdc-wdm: use... |
564 |
mutex_unlock(&desc->rlock); |
afba937e5 USB: CDC WDM driver |
565 566 567 568 569 570 571 572 |
return rv; } static int wdm_flush(struct file *file, fl_owner_t id) { struct wdm_device *desc = file->private_data; wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); |
6b0b79d38 USB: cdc-wdm: can... |
573 574 575 |
/* cannot dereference desc->intf if WDM_DISCONNECTING */ if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags)) |
9908a32e9 USB: remove err()... |
576 577 578 |
dev_err(&desc->intf->dev, "Error in flush path: %d ", desc->werr); |
afba937e5 USB: CDC WDM driver |
579 |
|
24a85bae5 USB: cdc-wdm: san... |
580 |
return usb_translate_errors(desc->werr); |
afba937e5 USB: CDC WDM driver |
581 582 583 584 585 586 587 588 589 590 |
} static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) { struct wdm_device *desc = file->private_data; unsigned long flags; unsigned int mask = 0; spin_lock_irqsave(&desc->iuspin, flags); if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
616b6937e USB: cdc-wdm: pol... |
591 |
mask = POLLHUP | POLLERR; |
afba937e5 USB: CDC WDM driver |
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 |
spin_unlock_irqrestore(&desc->iuspin, flags); goto desc_out; } if (test_bit(WDM_READ, &desc->flags)) mask = POLLIN | POLLRDNORM; if (desc->rerr || desc->werr) mask |= POLLERR; if (!test_bit(WDM_IN_USE, &desc->flags)) mask |= POLLOUT | POLLWRNORM; spin_unlock_irqrestore(&desc->iuspin, flags); poll_wait(file, &desc->wait, wait); desc_out: return mask; } static int wdm_open(struct inode *inode, struct file *file) { int minor = iminor(inode); int rv = -ENODEV; struct usb_interface *intf; struct wdm_device *desc; mutex_lock(&wdm_mutex); |
b0c138608 usb: cdc-wdm: add... |
617 618 |
desc = wdm_find_device_by_minor(minor); if (!desc) |
afba937e5 USB: CDC WDM driver |
619 |
goto out; |
b0c138608 usb: cdc-wdm: add... |
620 |
intf = desc->intf; |
afba937e5 USB: CDC WDM driver |
621 622 |
if (test_bit(WDM_DISCONNECTING, &desc->flags)) goto out; |
afba937e5 USB: CDC WDM driver |
623 |
file->private_data = desc; |
17d80d562 USB: autosuspend ... |
624 |
rv = usb_autopm_get_interface(desc->intf); |
afba937e5 USB: CDC WDM driver |
625 |
if (rv < 0) { |
9908a32e9 USB: remove err()... |
626 627 |
dev_err(&desc->intf->dev, "Error autopm - %d ", rv); |
afba937e5 USB: CDC WDM driver |
628 629 |
goto out; } |
afba937e5 USB: CDC WDM driver |
630 |
|
e8537bd2c USB: cdc-wdm: use... |
631 632 |
/* using write lock to protect desc->count */ mutex_lock(&desc->wlock); |
17d80d562 USB: autosuspend ... |
633 |
if (!desc->count++) { |
d771d8aa3 USB: cdc-wdm: res... |
634 635 |
desc->werr = 0; desc->rerr = 0; |
17d80d562 USB: autosuspend ... |
636 637 638 |
rv = usb_submit_urb(desc->validity, GFP_KERNEL); if (rv < 0) { desc->count--; |
9908a32e9 USB: remove err()... |
639 640 641 |
dev_err(&desc->intf->dev, "Error submitting int urb - %d ", rv); |
12a98b2bd USB: cdc-wdm: cle... |
642 |
rv = usb_translate_errors(rv); |
17d80d562 USB: autosuspend ... |
643 644 645 646 |
} } else { rv = 0; } |
e8537bd2c USB: cdc-wdm: use... |
647 |
mutex_unlock(&desc->wlock); |
3cc361574 usb: cdc-wdm: add... |
648 649 |
if (desc->count == 1) desc->manage_power(intf, 1); |
17d80d562 USB: autosuspend ... |
650 |
usb_autopm_put_interface(desc->intf); |
afba937e5 USB: CDC WDM driver |
651 652 653 654 655 656 657 658 659 660 |
out: mutex_unlock(&wdm_mutex); return rv; } static int wdm_release(struct inode *inode, struct file *file) { struct wdm_device *desc = file->private_data; mutex_lock(&wdm_mutex); |
e8537bd2c USB: cdc-wdm: use... |
661 662 663 |
/* using write lock to protect desc->count */ mutex_lock(&desc->wlock); |
afba937e5 USB: CDC WDM driver |
664 |
desc->count--; |
e8537bd2c USB: cdc-wdm: use... |
665 |
mutex_unlock(&desc->wlock); |
17d80d562 USB: autosuspend ... |
666 |
|
afba937e5 USB: CDC WDM driver |
667 |
if (!desc->count) { |
880bca3a2 USB: cdc-wdm: add... |
668 |
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { |
6b0b79d38 USB: cdc-wdm: can... |
669 670 |
dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); kill_urbs(desc); |
73e06865e USB: cdc-wdm: sup... |
671 672 673 |
spin_lock_irq(&desc->iuspin); desc->resp_count = 0; spin_unlock_irq(&desc->iuspin); |
3cc361574 usb: cdc-wdm: add... |
674 |
desc->manage_power(desc->intf, 0); |
880bca3a2 USB: cdc-wdm: add... |
675 |
} else { |
6b0b79d38 USB: cdc-wdm: can... |
676 677 678 |
/* must avoid dev_printk here as desc->intf is invalid */ pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up ", __func__); |
2f338c8a1 USB: cdc-wdm: fix... |
679 |
cleanup(desc); |
880bca3a2 USB: cdc-wdm: add... |
680 |
} |
afba937e5 USB: CDC WDM driver |
681 682 683 684 |
} mutex_unlock(&wdm_mutex); return 0; } |
3edce1cf8 USB: cdc-wdm: imp... |
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 |
static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct wdm_device *desc = file->private_data; int rv = 0; switch (cmd) { case IOCTL_WDM_MAX_COMMAND: if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand))) rv = -EFAULT; break; default: rv = -ENOTTY; } return rv; } |
afba937e5 USB: CDC WDM driver |
700 701 702 703 704 705 706 |
static const struct file_operations wdm_fops = { .owner = THIS_MODULE, .read = wdm_read, .write = wdm_write, .open = wdm_open, .flush = wdm_flush, .release = wdm_release, |
6038f373a llseek: automatic... |
707 |
.poll = wdm_poll, |
3edce1cf8 USB: cdc-wdm: imp... |
708 709 |
.unlocked_ioctl = wdm_ioctl, .compat_ioctl = wdm_ioctl, |
6038f373a llseek: automatic... |
710 |
.llseek = noop_llseek, |
afba937e5 USB: CDC WDM driver |
711 712 713 714 715 716 717 718 719 720 721 722 723 |
}; static struct usb_class_driver wdm_class = { .name = "cdc-wdm%d", .fops = &wdm_fops, .minor_base = WDM_MINOR_BASE, }; /* --- error handling --- */ static void wdm_rxwork(struct work_struct *work) { struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); unsigned long flags; |
6dd433e6c USB: cdc-wdm: fix... |
724 725 |
int rv = 0; int responding; |
afba937e5 USB: CDC WDM driver |
726 727 728 729 730 |
spin_lock_irqsave(&desc->iuspin, flags); if (test_bit(WDM_DISCONNECTING, &desc->flags)) { spin_unlock_irqrestore(&desc->iuspin, flags); } else { |
6dd433e6c USB: cdc-wdm: fix... |
731 |
responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
afba937e5 USB: CDC WDM driver |
732 |
spin_unlock_irqrestore(&desc->iuspin, flags); |
6dd433e6c USB: cdc-wdm: fix... |
733 734 |
if (!responding) rv = usb_submit_urb(desc->response, GFP_KERNEL); |
afba937e5 USB: CDC WDM driver |
735 736 |
if (rv < 0 && rv != -EPERM) { spin_lock_irqsave(&desc->iuspin, flags); |
6dd433e6c USB: cdc-wdm: fix... |
737 |
clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e5 USB: CDC WDM driver |
738 739 740 741 742 743 744 745 |
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) schedule_work(&desc->rxwork); spin_unlock_irqrestore(&desc->iuspin, flags); } } } /* --- hotplug --- */ |
3cc361574 usb: cdc-wdm: add... |
746 747 |
static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, u16 bufsize, int (*manage_power)(struct usb_interface *, int)) |
afba937e5 USB: CDC WDM driver |
748 |
{ |
0dffb4862 usb: cdc-wdm: spl... |
749 |
int rv = -ENOMEM; |
afba937e5 USB: CDC WDM driver |
750 |
struct wdm_device *desc; |
afba937e5 USB: CDC WDM driver |
751 |
|
afba937e5 USB: CDC WDM driver |
752 753 754 |
desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); if (!desc) goto out; |
b0c138608 usb: cdc-wdm: add... |
755 |
INIT_LIST_HEAD(&desc->device_list); |
e8537bd2c USB: cdc-wdm: use... |
756 757 |
mutex_init(&desc->rlock); mutex_init(&desc->wlock); |
afba937e5 USB: CDC WDM driver |
758 759 |
spin_lock_init(&desc->iuspin); init_waitqueue_head(&desc->wait); |
0dffb4862 usb: cdc-wdm: spl... |
760 |
desc->wMaxCommand = bufsize; |
052fbc0d7 USB: correct erro... |
761 |
/* this will be expanded and needed in hardware endianness */ |
afba937e5 USB: CDC WDM driver |
762 763 764 |
desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); desc->intf = intf; INIT_WORK(&desc->rxwork, wdm_rxwork); |
052fbc0d7 USB: correct erro... |
765 |
rv = -EINVAL; |
0dffb4862 usb: cdc-wdm: spl... |
766 |
if (!usb_endpoint_is_int_in(ep)) |
afba937e5 USB: CDC WDM driver |
767 |
goto err; |
afba937e5 USB: CDC WDM driver |
768 |
|
29cc88979 USB: use usb_endp... |
769 |
desc->wMaxPacketSize = usb_endpoint_maxp(ep); |
afba937e5 USB: CDC WDM driver |
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 |
desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); if (!desc->orq) goto err; desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); if (!desc->irq) goto err; desc->validity = usb_alloc_urb(0, GFP_KERNEL); if (!desc->validity) goto err; desc->response = usb_alloc_urb(0, GFP_KERNEL); if (!desc->response) goto err; desc->command = usb_alloc_urb(0, GFP_KERNEL); if (!desc->command) goto err; desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); if (!desc->ubuf) goto err; |
8457d99ca USB: cdc-wdm: no ... |
793 |
desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL); |
afba937e5 USB: CDC WDM driver |
794 795 |
if (!desc->sbuf) goto err; |
8457d99ca USB: cdc-wdm: no ... |
796 |
desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
afba937e5 USB: CDC WDM driver |
797 |
if (!desc->inbuf) |
8457d99ca USB: cdc-wdm: no ... |
798 |
goto err; |
afba937e5 USB: CDC WDM driver |
799 800 801 802 803 804 805 806 807 808 809 |
usb_fill_int_urb( desc->validity, interface_to_usbdev(intf), usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), desc->sbuf, desc->wMaxPacketSize, wdm_int_callback, desc, ep->bInterval ); |
afba937e5 USB: CDC WDM driver |
810 |
|
19b85b3b8 USB: cdc-wdm: no ... |
811 812 813 814 815 816 817 818 |
desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; desc->irq->wValue = 0; desc->irq->wIndex = desc->inum; desc->irq->wLength = cpu_to_le16(desc->wMaxCommand); usb_fill_control_urb( desc->response, |
8143a8963 USB: cdc-wdm: kil... |
819 |
interface_to_usbdev(intf), |
19b85b3b8 USB: cdc-wdm: no ... |
820 821 822 823 824 825 826 827 |
/* using common endpoint 0 */ usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), (unsigned char *)desc->irq, desc->inbuf, desc->wMaxCommand, wdm_in_callback, desc ); |
19b85b3b8 USB: cdc-wdm: no ... |
828 |
|
3cc361574 usb: cdc-wdm: add... |
829 |
desc->manage_power = manage_power; |
b0c138608 usb: cdc-wdm: add... |
830 831 832 |
spin_lock(&wdm_device_list_lock); list_add(&desc->device_list, &wdm_device_list); spin_unlock(&wdm_device_list_lock); |
afba937e5 USB: CDC WDM driver |
833 |
rv = usb_register_dev(intf, &wdm_class); |
afba937e5 USB: CDC WDM driver |
834 |
if (rv < 0) |
b0c138608 usb: cdc-wdm: add... |
835 |
goto err; |
052fbc0d7 USB: correct erro... |
836 |
else |
820c629a5 USB: cdc-wdm: avo... |
837 838 |
dev_info(&intf->dev, "%s: USB WDM device ", dev_name(intf->usb_dev)); |
afba937e5 USB: CDC WDM driver |
839 840 |
out: return rv; |
afba937e5 USB: CDC WDM driver |
841 |
err: |
6286d85e8 USB: cdc-wdm: rem... |
842 843 844 |
spin_lock(&wdm_device_list_lock); list_del(&desc->device_list); spin_unlock(&wdm_device_list_lock); |
0dffb4862 usb: cdc-wdm: spl... |
845 846 847 |
cleanup(desc); return rv; } |
3cc361574 usb: cdc-wdm: add... |
848 849 850 851 |
static int wdm_manage_power(struct usb_interface *intf, int on) { /* need autopm_get/put here to ensure the usbcore sees the new value */ int rv = usb_autopm_get_interface(intf); |
3cc361574 usb: cdc-wdm: add... |
852 853 |
intf->needs_remote_wakeup = on; |
4144bc861 usb: cdc-wdm: man... |
854 855 856 |
if (!rv) usb_autopm_put_interface(intf); return 0; |
3cc361574 usb: cdc-wdm: add... |
857 |
} |
0dffb4862 usb: cdc-wdm: spl... |
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 |
static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) { int rv = -EINVAL; struct usb_host_interface *iface; struct usb_endpoint_descriptor *ep; struct usb_cdc_dmm_desc *dmhd; u8 *buffer = intf->altsetting->extra; int buflen = intf->altsetting->extralen; u16 maxcom = WDM_DEFAULT_BUFSIZE; if (!buffer) goto err; while (buflen > 2) { if (buffer[1] != USB_DT_CS_INTERFACE) { dev_err(&intf->dev, "skipping garbage "); goto next_desc; } switch (buffer[2]) { case USB_CDC_HEADER_TYPE: break; case USB_CDC_DMM_TYPE: dmhd = (struct usb_cdc_dmm_desc *)buffer; maxcom = le16_to_cpu(dmhd->wMaxCommand); dev_dbg(&intf->dev, "Finding maximum buffer length: %d", maxcom); break; default: dev_err(&intf->dev, "Ignoring extra header, type %d, length %d ", buffer[2], buffer[0]); break; } next_desc: buflen -= buffer[0]; buffer += buffer[0]; } iface = intf->cur_altsetting; if (iface->desc.bNumEndpoints != 1) goto err; ep = &iface->endpoint[0].desc; |
3cc361574 usb: cdc-wdm: add... |
902 |
rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); |
0dffb4862 usb: cdc-wdm: spl... |
903 904 |
err: |
afba937e5 USB: CDC WDM driver |
905 906 |
return rv; } |
3cc361574 usb: cdc-wdm: add... |
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 |
/** * usb_cdc_wdm_register - register a WDM subdriver * @intf: usb interface the subdriver will associate with * @ep: interrupt endpoint to monitor for notifications * @bufsize: maximum message size to support for read/write * * Create WDM usb class character device and associate it with intf * without binding, allowing another driver to manage the interface. * * The subdriver will manage the given interrupt endpoint exclusively * and will issue control requests referring to the given intf. It * will otherwise avoid interferring, and in particular not do * usb_set_intfdata/usb_get_intfdata on intf. * * The return value is a pointer to the subdriver's struct usb_driver. * The registering driver is responsible for calling this subdriver's * disconnect, suspend, resume, pre_reset and post_reset methods from * its own. */ struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, int bufsize, int (*manage_power)(struct usb_interface *, int)) { int rv = -EINVAL; rv = wdm_create(intf, ep, bufsize, manage_power); if (rv < 0) goto err; return &wdm_driver; err: return ERR_PTR(rv); } EXPORT_SYMBOL(usb_cdc_wdm_register); |
afba937e5 USB: CDC WDM driver |
942 943 944 945 946 947 |
static void wdm_disconnect(struct usb_interface *intf) { struct wdm_device *desc; unsigned long flags; usb_deregister_dev(intf, &wdm_class); |
b0c138608 usb: cdc-wdm: add... |
948 |
desc = wdm_find_device(intf); |
afba937e5 USB: CDC WDM driver |
949 |
mutex_lock(&wdm_mutex); |
afba937e5 USB: CDC WDM driver |
950 951 952 953 954 |
/* the spinlock makes sure no new urbs are generated in the callbacks */ spin_lock_irqsave(&desc->iuspin, flags); set_bit(WDM_DISCONNECTING, &desc->flags); set_bit(WDM_READ, &desc->flags); |
17d80d562 USB: autosuspend ... |
955 |
/* to terminate pending flushes */ |
afba937e5 USB: CDC WDM driver |
956 957 |
clear_bit(WDM_IN_USE, &desc->flags); spin_unlock_irqrestore(&desc->iuspin, flags); |
62aaf24dc USB: cdc-wdm: cal... |
958 |
wake_up_all(&desc->wait); |
e8537bd2c USB: cdc-wdm: use... |
959 960 |
mutex_lock(&desc->rlock); mutex_lock(&desc->wlock); |
afba937e5 USB: CDC WDM driver |
961 |
kill_urbs(desc); |
d93d16e9a usb: cdc-wdm: Fix... |
962 |
cancel_work_sync(&desc->rxwork); |
e8537bd2c USB: cdc-wdm: use... |
963 964 |
mutex_unlock(&desc->wlock); mutex_unlock(&desc->rlock); |
6286d85e8 USB: cdc-wdm: rem... |
965 966 967 968 969 |
/* the desc->intf pointer used as list key is now invalid */ spin_lock(&wdm_device_list_lock); list_del(&desc->device_list); spin_unlock(&wdm_device_list_lock); |
afba937e5 USB: CDC WDM driver |
970 971 |
if (!desc->count) cleanup(desc); |
880bca3a2 USB: cdc-wdm: add... |
972 973 974 |
else dev_dbg(&intf->dev, "%s: %d open files - postponing cleanup ", __func__, desc->count); |
afba937e5 USB: CDC WDM driver |
975 976 |
mutex_unlock(&wdm_mutex); } |
d93d16e9a usb: cdc-wdm: Fix... |
977 |
#ifdef CONFIG_PM |
17d80d562 USB: autosuspend ... |
978 979 |
static int wdm_suspend(struct usb_interface *intf, pm_message_t message) { |
b0c138608 usb: cdc-wdm: add... |
980 |
struct wdm_device *desc = wdm_find_device(intf); |
17d80d562 USB: autosuspend ... |
981 982 983 984 |
int rv = 0; dev_dbg(&desc->intf->dev, "wdm%d_suspend ", intf->minor); |
d93d16e9a usb: cdc-wdm: Fix... |
985 |
/* if this is an autosuspend the caller does the locking */ |
e8537bd2c USB: cdc-wdm: use... |
986 987 988 989 |
if (!PMSG_IS_AUTO(message)) { mutex_lock(&desc->rlock); mutex_lock(&desc->wlock); } |
62e668547 usb: cdc-wdm:Fix ... |
990 |
spin_lock_irq(&desc->iuspin); |
d93d16e9a usb: cdc-wdm: Fix... |
991 |
|
5b1b0b812 PM / Runtime: Add... |
992 |
if (PMSG_IS_AUTO(message) && |
922a5eadd usb: cdc-wdm: Fix... |
993 994 |
(test_bit(WDM_IN_USE, &desc->flags) || test_bit(WDM_RESPONDING, &desc->flags))) { |
62e668547 usb: cdc-wdm:Fix ... |
995 |
spin_unlock_irq(&desc->iuspin); |
17d80d562 USB: autosuspend ... |
996 997 |
rv = -EBUSY; } else { |
d93d16e9a usb: cdc-wdm: Fix... |
998 |
|
beb1d35f1 usb: cdc-wdm: Fix... |
999 |
set_bit(WDM_SUSPENDING, &desc->flags); |
62e668547 usb: cdc-wdm:Fix ... |
1000 |
spin_unlock_irq(&desc->iuspin); |
d93d16e9a usb: cdc-wdm: Fix... |
1001 |
/* callback submits work - order is essential */ |
17d80d562 USB: autosuspend ... |
1002 |
kill_urbs(desc); |
d93d16e9a usb: cdc-wdm: Fix... |
1003 |
cancel_work_sync(&desc->rxwork); |
17d80d562 USB: autosuspend ... |
1004 |
} |
e8537bd2c USB: cdc-wdm: use... |
1005 1006 1007 1008 |
if (!PMSG_IS_AUTO(message)) { mutex_unlock(&desc->wlock); mutex_unlock(&desc->rlock); } |
17d80d562 USB: autosuspend ... |
1009 1010 1011 |
return rv; } |
d93d16e9a usb: cdc-wdm: Fix... |
1012 |
#endif |
17d80d562 USB: autosuspend ... |
1013 1014 1015 1016 1017 1018 1019 1020 |
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) |
9908a32e9 USB: remove err()... |
1021 1022 1023 |
dev_err(&desc->intf->dev, "Error resume submitting int urb - %d ", rv); |
17d80d562 USB: autosuspend ... |
1024 1025 1026 |
} return rv; } |
d93d16e9a usb: cdc-wdm: Fix... |
1027 1028 |
#ifdef CONFIG_PM |
17d80d562 USB: autosuspend ... |
1029 1030 |
static int wdm_resume(struct usb_interface *intf) { |
b0c138608 usb: cdc-wdm: add... |
1031 |
struct wdm_device *desc = wdm_find_device(intf); |
17d80d562 USB: autosuspend ... |
1032 1033 1034 1035 |
int rv; dev_dbg(&desc->intf->dev, "wdm%d_resume ", intf->minor); |
338124c1f usb: cdc-wdm: Fix... |
1036 |
|
beb1d35f1 usb: cdc-wdm: Fix... |
1037 |
clear_bit(WDM_SUSPENDING, &desc->flags); |
62e668547 usb: cdc-wdm:Fix ... |
1038 |
rv = recover_from_urb_loss(desc); |
338124c1f usb: cdc-wdm: Fix... |
1039 |
|
17d80d562 USB: autosuspend ... |
1040 1041 |
return rv; } |
d93d16e9a usb: cdc-wdm: Fix... |
1042 |
#endif |
17d80d562 USB: autosuspend ... |
1043 1044 1045 |
static int wdm_pre_reset(struct usb_interface *intf) { |
b0c138608 usb: cdc-wdm: add... |
1046 |
struct wdm_device *desc = wdm_find_device(intf); |
17d80d562 USB: autosuspend ... |
1047 |
|
d771d8aa3 USB: cdc-wdm: res... |
1048 1049 1050 1051 1052 1053 1054 |
/* * we notify everybody using poll of * an exceptional situation * must be done before recovery lest a spontaneous * message from the device is lost */ spin_lock_irq(&desc->iuspin); |
880442027 usb: cdc-wdm: mak... |
1055 1056 1057 |
set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */ set_bit(WDM_READ, &desc->flags); /* unblock read */ clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */ |
d771d8aa3 USB: cdc-wdm: res... |
1058 1059 1060 |
desc->rerr = -EINTR; spin_unlock_irq(&desc->iuspin); wake_up_all(&desc->wait); |
880442027 usb: cdc-wdm: mak... |
1061 1062 1063 1064 |
mutex_lock(&desc->rlock); mutex_lock(&desc->wlock); kill_urbs(desc); cancel_work_sync(&desc->rxwork); |
17d80d562 USB: autosuspend ... |
1065 1066 1067 1068 1069 |
return 0; } static int wdm_post_reset(struct usb_interface *intf) { |
b0c138608 usb: cdc-wdm: add... |
1070 |
struct wdm_device *desc = wdm_find_device(intf); |
17d80d562 USB: autosuspend ... |
1071 |
int rv; |
c0f5ecee4 USB: cdc-wdm: fix... |
1072 |
clear_bit(WDM_OVERFLOW, &desc->flags); |
880442027 usb: cdc-wdm: mak... |
1073 |
clear_bit(WDM_RESETTING, &desc->flags); |
17d80d562 USB: autosuspend ... |
1074 |
rv = recover_from_urb_loss(desc); |
e8537bd2c USB: cdc-wdm: use... |
1075 1076 |
mutex_unlock(&desc->wlock); mutex_unlock(&desc->rlock); |
17d80d562 USB: autosuspend ... |
1077 1078 |
return 0; } |
afba937e5 USB: CDC WDM driver |
1079 1080 1081 1082 |
static struct usb_driver wdm_driver = { .name = "cdc_wdm", .probe = wdm_probe, .disconnect = wdm_disconnect, |
d93d16e9a usb: cdc-wdm: Fix... |
1083 |
#ifdef CONFIG_PM |
17d80d562 USB: autosuspend ... |
1084 1085 1086 |
.suspend = wdm_suspend, .resume = wdm_resume, .reset_resume = wdm_resume, |
d93d16e9a usb: cdc-wdm: Fix... |
1087 |
#endif |
17d80d562 USB: autosuspend ... |
1088 1089 |
.pre_reset = wdm_pre_reset, .post_reset = wdm_post_reset, |
afba937e5 USB: CDC WDM driver |
1090 |
.id_table = wdm_ids, |
17d80d562 USB: autosuspend ... |
1091 |
.supports_autosuspend = 1, |
e1f12eb6b USB: Disable hub-... |
1092 |
.disable_hub_initiated_lpm = 1, |
afba937e5 USB: CDC WDM driver |
1093 |
}; |
65db43054 USB: convert driv... |
1094 |
module_usb_driver(wdm_driver); |
afba937e5 USB: CDC WDM driver |
1095 1096 |
MODULE_AUTHOR(DRIVER_AUTHOR); |
87d65e54b USB: cdc-wdm cleanup |
1097 |
MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e5 USB: CDC WDM driver |
1098 |
MODULE_LICENSE("GPL"); |