diff options
Diffstat (limited to 'drivers/hid/usbhid/hid-core.c')
| -rw-r--r-- | drivers/hid/usbhid/hid-core.c | 1661 |
1 files changed, 1661 insertions, 0 deletions
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c new file mode 100644 index 000000000..bfbe1bedd --- /dev/null +++ b/drivers/hid/usbhid/hid-core.c @@ -0,0 +1,1661 @@ +/* + * USB HID support for Linux + * + * Copyright (c) 1999 Andreas Gal + * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> + * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc + * Copyright (c) 2007-2008 Oliver Neukum + * Copyright (c) 2006-2010 Jiri Kosina + */ + +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mm.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> +#include <asm/unaligned.h> +#include <asm/byteorder.h> +#include <linux/input.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <linux/string.h> + +#include <linux/usb.h> + +#include <linux/hid.h> +#include <linux/hiddev.h> +#include <linux/hid-debug.h> +#include <linux/hidraw.h> +#include "usbhid.h" + +/* + * Version Information + */ + +#define DRIVER_DESC "USB HID core driver" +#define DRIVER_LICENSE "GPL" + +/* + * Module parameters. + */ + +static unsigned int hid_mousepoll_interval; +module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644); +MODULE_PARM_DESC(mousepoll, "Polling interval of mice"); + +static unsigned int ignoreled; +module_param_named(ignoreled, ignoreled, uint, 0644); +MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds"); + +/* Quirks specified at module load time */ +static char *quirks_param[MAX_USBHID_BOOT_QUIRKS]; +module_param_array_named(quirks, quirks_param, charp, NULL, 0444); +MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying " + " quirks=vendorID:productID:quirks" + " where vendorID, productID, and quirks are all in" + " 0x-prefixed hex"); +/* + * Input submission and I/O error handler. + */ +static DEFINE_MUTEX(hid_open_mut); + +static void hid_io_error(struct hid_device *hid); +static int hid_submit_out(struct hid_device *hid); +static int hid_submit_ctrl(struct hid_device *hid); +static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid); + +/* Start up the input URB */ +static int hid_start_in(struct hid_device *hid) +{ + unsigned long flags; + int rc = 0; + struct usbhid_device *usbhid = hid->driver_data; + + spin_lock_irqsave(&usbhid->lock, flags); + if ((hid->open > 0 || hid->quirks & HID_QUIRK_ALWAYS_POLL) && + !test_bit(HID_DISCONNECTED, &usbhid->iofl) && + !test_bit(HID_SUSPENDED, &usbhid->iofl) && + !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) { + rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC); + if (rc != 0) { + clear_bit(HID_IN_RUNNING, &usbhid->iofl); + if (rc == -ENOSPC) + set_bit(HID_NO_BANDWIDTH, &usbhid->iofl); + } else { + clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl); + } + } + spin_unlock_irqrestore(&usbhid->lock, flags); + return rc; +} + +/* I/O retry timer routine */ +static void hid_retry_timeout(unsigned long _hid) +{ + struct hid_device *hid = (struct hid_device *) _hid; + struct usbhid_device *usbhid = hid->driver_data; + + dev_dbg(&usbhid->intf->dev, "retrying intr urb\n"); + if (hid_start_in(hid)) + hid_io_error(hid); +} + +/* Workqueue routine to reset the device or clear a halt */ +static void hid_reset(struct work_struct *work) +{ + struct usbhid_device *usbhid = + container_of(work, struct usbhid_device, reset_work); + struct hid_device *hid = usbhid->hid; + int rc; + + if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) { + dev_dbg(&usbhid->intf->dev, "clear halt\n"); + rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe); + clear_bit(HID_CLEAR_HALT, &usbhid->iofl); + if (rc == 0) { + hid_start_in(hid); + } else { + dev_dbg(&usbhid->intf->dev, + "clear-halt failed: %d\n", rc); + set_bit(HID_RESET_PENDING, &usbhid->iofl); + } + } + + if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) { + dev_dbg(&usbhid->intf->dev, "resetting device\n"); + usb_queue_reset_device(usbhid->intf); + } +} + +/* Main I/O error handler */ +static void hid_io_error(struct hid_device *hid) +{ + unsigned long flags; + struct usbhid_device *usbhid = hid->driver_data; + + spin_lock_irqsave(&usbhid->lock, flags); + + /* Stop when disconnected */ + if (test_bit(HID_DISCONNECTED, &usbhid->iofl)) + goto done; + + /* If it has been a while since the last error, we'll assume + * this a brand new error and reset the retry timeout. */ + if (time_after(jiffies, usbhid->stop_retry + HZ/2)) + usbhid->retry_delay = 0; + + /* When an error occurs, retry at increasing intervals */ + if (usbhid->retry_delay == 0) { + usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */ + usbhid->stop_retry = jiffies + msecs_to_jiffies(1000); + } else if (usbhid->retry_delay < 100) + usbhid->retry_delay *= 2; + + if (time_after(jiffies, usbhid->stop_retry)) { + + /* Retries failed, so do a port reset unless we lack bandwidth*/ + if (test_bit(HID_NO_BANDWIDTH, &usbhid->iofl) + && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) { + + schedule_work(&usbhid->reset_work); + goto done; + } + } + + mod_timer(&usbhid->io_retry, + jiffies + msecs_to_jiffies(usbhid->retry_delay)); +done: + spin_unlock_irqrestore(&usbhid->lock, flags); +} + +static void usbhid_mark_busy(struct usbhid_device *usbhid) +{ + struct usb_interface *intf = usbhid->intf; + + usb_mark_last_busy(interface_to_usbdev(intf)); +} + +static int usbhid_restart_out_queue(struct usbhid_device *usbhid) +{ + struct hid_device *hid = usb_get_intfdata(usbhid->intf); + int kicked; + int r; + + if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) || + test_bit(HID_SUSPENDED, &usbhid->iofl)) + return 0; + + if ((kicked = (usbhid->outhead != usbhid->outtail))) { + hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail); + + /* Try to wake up from autosuspend... */ + r = usb_autopm_get_interface_async(usbhid->intf); + if (r < 0) + return r; + + /* + * If still suspended, don't submit. Submission will + * occur if/when resume drains the queue. + */ + if (test_bit(HID_SUSPENDED, &usbhid->iofl)) { + usb_autopm_put_interface_no_suspend(usbhid->intf); + return r; + } + + /* Asynchronously flush queue. */ + set_bit(HID_OUT_RUNNING, &usbhid->iofl); + if (hid_submit_out(hid)) { + clear_bit(HID_OUT_RUNNING, &usbhid->iofl); + usb_autopm_put_interface_async(usbhid->intf); + } + wake_up(&usbhid->wait); + } + return kicked; +} + +static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid) +{ + struct hid_device *hid = usb_get_intfdata(usbhid->intf); + int kicked; + int r; + + WARN_ON(hid == NULL); + if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) || + test_bit(HID_SUSPENDED, &usbhid->iofl)) + return 0; + + if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) { + hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail); + + /* Try to wake up from autosuspend... */ + r = usb_autopm_get_interface_async(usbhid->intf); + if (r < 0) + return r; + + /* + * If still suspended, don't submit. Submission will + * occur if/when resume drains the queue. + */ + if (test_bit(HID_SUSPENDED, &usbhid->iofl)) { + usb_autopm_put_interface_no_suspend(usbhid->intf); + return r; + } + + /* Asynchronously flush queue. */ + set_bit(HID_CTRL_RUNNING, &usbhid->iofl); + if (hid_submit_ctrl(hid)) { + clear_bit(HID_CTRL_RUNNING, &usbhid->iofl); + usb_autopm_put_interface_async(usbhid->intf); + } + wake_up(&usbhid->wait); + } + return kicked; +} + +/* + * Input interrupt completion handler. + */ + +static void hid_irq_in(struct urb *urb) +{ + struct hid_device *hid = urb->context; + struct usbhid_device *usbhid = hid->driver_data; + int status; + + switch (urb->status) { + case 0: /* success */ + usbhid_mark_busy(usbhid); + usbhid->retry_delay = 0; + if ((hid->quirks & HID_QUIRK_ALWAYS_POLL) && !hid->open) + break; + if (!test_bit(HID_RESUME_RUNNING, &usbhid->iofl)) { + hid_input_report(urb->context, HID_INPUT_REPORT, + urb->transfer_buffer, + urb->actual_length, 1); + /* + * autosuspend refused while keys are pressed + * because most keyboards don't wake up when + * a key is released + */ + if (hid_check_keys_pressed(hid)) + set_bit(HID_KEYS_PRESSED, &usbhid->iofl); + else + clear_bit(HID_KEYS_PRESSED, &usbhid->iofl); + } + break; + case -EPIPE: /* stall */ + usbhid_mark_busy(usbhid); + clear_bit(HID_IN_RUNNING, &usbhid->iofl); + set_bit(HID_CLEAR_HALT, &usbhid->iofl); + schedule_work(&usbhid->reset_work); + return; + case -ECONNRESET: /* unlink */ + case -ENOENT: + case -ESHUTDOWN: /* unplug */ + clear_bit(HID_IN_RUNNING, &usbhid->iofl); + return; + case -EILSEQ: /* protocol error or unplug */ + case -EPROTO: /* protocol error or unplug */ + case -ETIME: /* protocol error or unplug */ + case -ETIMEDOUT: /* Should never happen, but... */ + usbhid_mark_busy(usbhid); + clear_bit(HID_IN_RUNNING, &usbhid->iofl); + hid_io_error(hid); + return; + default: /* error */ + hid_warn(urb->dev, "input irq status %d received\n", + urb->status); + } + + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status) { + clear_bit(HID_IN_RUNNING, &usbhid->iofl); + if (status != -EPERM) { + hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n", + hid_to_usb_dev(hid)->bus->bus_name, + hid_to_usb_dev(hid)->devpath, + usbhid->ifnum, status); + hid_io_error(hid); + } + } +} + +static int hid_submit_out(struct hid_device *hid) +{ + struct hid_report *report; + char *raw_report; + struct usbhid_device *usbhid = hid->driver_data; + int r; + + report = usbhid->out[usbhid->outtail].report; + raw_report = usbhid->out[usbhid->outtail].raw_report; + + usbhid->urbout->transfer_buffer_length = hid_report_len(report); + usbhid->urbout->dev = hid_to_usb_dev(hid); + if (raw_report) { + memcpy(usbhid->outbuf, raw_report, + usbhid->urbout->transfer_buffer_length); + kfree(raw_report); + usbhid->out[usbhid->outtail].raw_report = NULL; + } + + dbg_hid("submitting out urb\n"); + + r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC); + if (r < 0) { + hid_err(hid, "usb_submit_urb(out) failed: %d\n", r); + return r; + } + usbhid->last_out = jiffies; + return 0; +} + +static int hid_submit_ctrl(struct hid_device *hid) +{ + struct hid_report *report; + unsigned char dir; + char *raw_report; + int len, r; + struct usbhid_device *usbhid = hid->driver_data; + + report = usbhid->ctrl[usbhid->ctrltail].report; + raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report; + dir = usbhid->ctrl[usbhid->ctrltail].dir; + + len = ((report->size - 1) >> 3) + 1 + (report->id > 0); + if (dir == USB_DIR_OUT) { + usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0); + usbhid->urbctrl->transfer_buffer_length = len; + if (raw_report) { + memcpy(usbhid->ctrlbuf, raw_report, len); + kfree(raw_report); + usbhid->ctrl[usbhid->ctrltail].raw_report = NULL; + } + } else { + int maxpacket, padlen; + + usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0); + maxpacket = usb_maxpacket(hid_to_usb_dev(hid), + usbhid->urbctrl->pipe, 0); + if (maxpacket > 0) { + padlen = DIV_ROUND_UP(len, maxpacket); + padlen *= maxpacket; + if (padlen > usbhid->bufsize) + padlen = usbhid->bufsize; + } else + padlen = 0; + usbhid->urbctrl->transfer_buffer_length = padlen; + } + usbhid->urbctrl->dev = hid_to_usb_dev(hid); + + usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir; + usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : + HID_REQ_GET_REPORT; + usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | + report->id); + usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum); + usbhid->cr->wLength = cpu_to_le16(len); + + dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n", + usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : + "Get_Report", + usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength); + + r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC); + if (r < 0) { + hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r); + return r; + } + usbhid->last_ctrl = jiffies; + return 0; +} + +/* + * Output interrupt completion handler. + */ + +static void hid_irq_out(struct urb *urb) +{ + struct hid_device *hid = urb->context; + struct usbhid_device *usbhid = hid->driver_data; + unsigned long flags; + int unplug = 0; + + switch (urb->status) { + case 0: /* success */ + break; + case -ESHUTDOWN: /* unplug */ + unplug = 1; + case -EILSEQ: /* protocol error or unplug */ + case -EPROTO: /* protocol error or unplug */ + case -ECONNRESET: /* unlink */ + case -ENOENT: + break; + default: /* error */ + hid_warn(urb->dev, "output irq status %d received\n", + urb->status); + } + + spin_lock_irqsave(&usbhid->lock, flags); + + if (unplug) { + usbhid->outtail = usbhid->outhead; + } else { + usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1); + + if (usbhid->outhead != usbhid->outtail && + hid_submit_out(hid) == 0) { + /* Successfully submitted next urb in queue */ + spin_unlock_irqrestore(&usbhid->lock, flags); + return; + } + } + + clear_bit(HID_OUT_RUNNING, &usbhid->iofl); + spin_unlock_irqrestore(&usbhid->lock, flags); + usb_autopm_put_interface_async(usbhid->intf); + wake_up(&usbhid->wait); +} + +/* + * Control pipe completion handler. + */ + +static void hid_ctrl(struct urb *urb) +{ + struct hid_device *hid = urb->context; + struct usbhid_device *usbhid = hid->driver_data; + int unplug = 0, status = urb->status; + + spin_lock(&usbhid->lock); + + switch (status) { + case 0: /* success */ + if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN) + hid_input_report(urb->context, + usbhid->ctrl[usbhid->ctrltail].report->type, + urb->transfer_buffer, urb->actual_length, 0); + break; + case -ESHUTDOWN: /* unplug */ + unplug = 1; + case -EILSEQ: /* protocol error or unplug */ + case -EPROTO: /* protocol error or unplug */ + case -ECONNRESET: /* unlink */ + case -ENOENT: + case -EPIPE: /* report not available */ + break; + default: /* error */ + hid_warn(urb->dev, "ctrl urb status %d received\n", status); + } + + if (unplug) { + usbhid->ctrltail = usbhid->ctrlhead; + } else { + usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1); + + if (usbhid->ctrlhead != usbhid->ctrltail && + hid_submit_ctrl(hid) == 0) { + /* Successfully submitted next urb in queue */ + spin_unlock(&usbhid->lock); + return; + } + } + + clear_bit(HID_CTRL_RUNNING, &usbhid->iofl); + spin_unlock(&usbhid->lock); + usb_autopm_put_interface_async(usbhid->intf); + wake_up(&usbhid->wait); +} + +static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report, + unsigned char dir) +{ + int head; + struct usbhid_device *usbhid = hid->driver_data; + + if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) || + test_bit(HID_DISCONNECTED, &usbhid->iofl)) + return; + + if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) { + if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) { + hid_warn(hid, "output queue full\n"); + return; + } + + usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC); + if (!usbhid->out[usbhid->outhead].raw_report) { + hid_warn(hid, "output queueing failed\n"); + return; + } + hid_output_report(report, usbhid->out[usbhid->outhead].raw_report); + usbhid->out[usbhid->outhead].report = report; + usbhid->outhead = head; + + /* If the queue isn't running, restart it */ + if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) { + usbhid_restart_out_queue(usbhid); + + /* Otherwise see if an earlier request has timed out */ + } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) { + + /* Prevent autosuspend following the unlink */ + usb_autopm_get_interface_no_resume(usbhid->intf); + + /* + * Prevent resubmission in case the URB completes + * before we can unlink it. We don't want to cancel + * the wrong transfer! + */ + usb_block_urb(usbhid->urbout); + + /* Drop lock to avoid deadlock if the callback runs */ + spin_unlock(&usbhid->lock); + + usb_unlink_urb(usbhid->urbout); + spin_lock(&usbhid->lock); + usb_unblock_urb(usbhid->urbout); + + /* Unlink might have stopped the queue */ + if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) + usbhid_restart_out_queue(usbhid); + + /* Now we can allow autosuspend again */ + usb_autopm_put_interface_async(usbhid->intf); + } + return; + } + + if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) { + hid_warn(hid, "control queue full\n"); + return; + } + + if (dir == USB_DIR_OUT) { + usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC); + if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) { + hid_warn(hid, "control queueing failed\n"); + return; + } + hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report); + } + usbhid->ctrl[usbhid->ctrlhead].report = report; + usbhid->ctrl[usbhid->ctrlhead].dir = dir; + usbhid->ctrlhead = head; + + /* If the queue isn't running, restart it */ + if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) { + usbhid_restart_ctrl_queue(usbhid); + + /* Otherwise see if an earlier request has timed out */ + } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) { + + /* Prevent autosuspend following the unlink */ + usb_autopm_get_interface_no_resume(usbhid->intf); + + /* + * Prevent resubmission in case the URB completes + * before we can unlink it. We don't want to cancel + * the wrong transfer! + */ + usb_block_urb(usbhid->urbctrl); + + /* Drop lock to avoid deadlock if the callback runs */ + spin_unlock(&usbhid->lock); + + usb_unlink_urb(usbhid->urbctrl); + spin_lock(&usbhid->lock); + usb_unblock_urb(usbhid->urbctrl); + + /* Unlink might have stopped the queue */ + if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) + usbhid_restart_ctrl_queue(usbhid); + + /* Now we can allow autosuspend again */ + usb_autopm_put_interface_async(usbhid->intf); + } +} + +static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir) +{ + struct usbhid_device *usbhid = hid->driver_data; + unsigned long flags; + + spin_lock_irqsave(&usbhid->lock, flags); + __usbhid_submit_report(hid, report, dir); + spin_unlock_irqrestore(&usbhid->lock, flags); +} + +static int usbhid_wait_io(struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + if (!wait_event_timeout(usbhid->wait, + (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) && + !test_bit(HID_OUT_RUNNING, &usbhid->iofl)), + 10*HZ)) { + dbg_hid("timeout waiting for ctrl or out queue to clear\n"); + return -1; + } + + return 0; +} + +static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle) +{ + return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report, + ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT); +} + +static int hid_get_class_descriptor(struct usb_device *dev, int ifnum, + unsigned char type, void *buf, int size) +{ + int result, retries = 4; + + memset(buf, 0, size); + + do { + result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), + USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN, + (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT); + retries--; + } while (result < size && retries); + return result; +} + +int usbhid_open(struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + int res = 0; + + mutex_lock(&hid_open_mut); + if (!hid->open++) { + res = usb_autopm_get_interface(usbhid->intf); + /* the device must be awake to reliably request remote wakeup */ + if (res < 0) { + hid->open--; + res = -EIO; + goto done; + } + usbhid->intf->needs_remote_wakeup = 1; + set_bit(HID_RESUME_RUNNING, &usbhid->iofl); + res = hid_start_in(hid); + if (res) { + if (res != -ENOSPC) { + hid_io_error(hid); + res = 0; + } else { + /* no use opening if resources are insufficient */ + hid->open--; + res = -EBUSY; + usbhid->intf->needs_remote_wakeup = 0; + } + } + usb_autopm_put_interface(usbhid->intf); + + /* + * In case events are generated while nobody was listening, + * some are released when the device is re-opened. + * Wait 50 msec for the queue to empty before allowing events + * to go through hid. + */ + msleep(50); + clear_bit(HID_RESUME_RUNNING, &usbhid->iofl); + } +done: + mutex_unlock(&hid_open_mut); + return res; +} + +void usbhid_close(struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + mutex_lock(&hid_open_mut); + + /* protecting hid->open to make sure we don't restart + * data acquistion due to a resumption we no longer + * care about + */ + spin_lock_irq(&usbhid->lock); + if (!--hid->open) { + spin_unlock_irq(&usbhid->lock); + hid_cancel_delayed_stuff(usbhid); + if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) { + usb_kill_urb(usbhid->urbin); + usbhid->intf->needs_remote_wakeup = 0; + } + } else { + spin_unlock_irq(&usbhid->lock); + } + mutex_unlock(&hid_open_mut); +} + +/* + * Initialize all reports + */ + +void usbhid_init_reports(struct hid_device *hid) +{ + struct hid_report *report; + struct usbhid_device *usbhid = hid->driver_data; + struct hid_report_enum *report_enum; + int err, ret; + + if (!(hid->quirks & HID_QUIRK_NO_INIT_INPUT_REPORTS)) { + report_enum = &hid->report_enum[HID_INPUT_REPORT]; + list_for_each_entry(report, &report_enum->report_list, list) + usbhid_submit_report(hid, report, USB_DIR_IN); + } + + report_enum = &hid->report_enum[HID_FEATURE_REPORT]; + list_for_each_entry(report, &report_enum->report_list, list) + usbhid_submit_report(hid, report, USB_DIR_IN); + + err = 0; + ret = usbhid_wait_io(hid); + while (ret) { + err |= ret; + if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) + usb_kill_urb(usbhid->urbctrl); + if (test_bit(HID_OUT_RUNNING, &usbhid->iofl)) + usb_kill_urb(usbhid->urbout); + ret = usbhid_wait_io(hid); + } + + if (err) + hid_warn(hid, "timeout initializing reports\n"); +} + +/* + * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01). + */ +static int hid_find_field_early(struct hid_device *hid, unsigned int page, + unsigned int hid_code, struct hid_field **pfield) +{ + struct hid_report *report; + struct hid_field *field; + struct hid_usage *usage; + int i, j; + + list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) { + for (i = 0; i < report->maxfield; i++) { + field = report->field[i]; + for (j = 0; j < field->maxusage; j++) { + usage = &field->usage[j]; + if ((usage->hid & HID_USAGE_PAGE) == page && + (usage->hid & 0xFFFF) == hid_code) { + *pfield = field; + return j; + } + } + } + } + return -1; +} + +static void usbhid_set_leds(struct hid_device *hid) +{ + struct hid_field *field; + int offset; + + if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) { + hid_set_field(field, offset, 0); + usbhid_submit_report(hid, field->report, USB_DIR_OUT); + } +} + +/* + * Traverse the supplied list of reports and find the longest + */ +static void hid_find_max_report(struct hid_device *hid, unsigned int type, + unsigned int *max) +{ + struct hid_report *report; + unsigned int size; + + list_for_each_entry(report, &hid->report_enum[type].report_list, list) { + size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered; + if (*max < size) + *max = size; + } +} + +static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL, + &usbhid->inbuf_dma); + usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL, + &usbhid->outbuf_dma); + usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL); + usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL, + &usbhid->ctrlbuf_dma); + if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr || + !usbhid->ctrlbuf) + return -1; + + return 0; +} + +static int usbhid_get_raw_report(struct hid_device *hid, + unsigned char report_number, __u8 *buf, size_t count, + unsigned char report_type) +{ + struct usbhid_device *usbhid = hid->driver_data; + struct usb_device *dev = hid_to_usb_dev(hid); + struct usb_interface *intf = usbhid->intf; + struct usb_host_interface *interface = intf->cur_altsetting; + int skipped_report_id = 0; + int ret; + + /* Byte 0 is the report number. Report data starts at byte 1.*/ + buf[0] = report_number; + if (report_number == 0x0) { + /* Offset the return buffer by 1, so that the report ID + will remain in byte 0. */ + buf++; + count--; + skipped_report_id = 1; + } + ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), + HID_REQ_GET_REPORT, + USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, + ((report_type + 1) << 8) | report_number, + interface->desc.bInterfaceNumber, buf, count, + USB_CTRL_SET_TIMEOUT); + + /* count also the report id */ + if (ret > 0 && skipped_report_id) + ret++; + + return ret; +} + +static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum, + __u8 *buf, size_t count, unsigned char rtype) +{ + struct usbhid_device *usbhid = hid->driver_data; + struct usb_device *dev = hid_to_usb_dev(hid); + struct usb_interface *intf = usbhid->intf; + struct usb_host_interface *interface = intf->cur_altsetting; + int ret, skipped_report_id = 0; + + /* Byte 0 is the report number. Report data starts at byte 1.*/ + if ((rtype == HID_OUTPUT_REPORT) && + (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID)) + buf[0] = 0; + else + buf[0] = reportnum; + + if (buf[0] == 0x0) { + /* Don't send the Report ID */ + buf++; + count--; + skipped_report_id = 1; + } + + ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + HID_REQ_SET_REPORT, + USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, + ((rtype + 1) << 8) | reportnum, + interface->desc.bInterfaceNumber, buf, count, + USB_CTRL_SET_TIMEOUT); + /* count also the report id, if this was a numbered report. */ + if (ret > 0 && skipped_report_id) + ret++; + + return ret; +} + +static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count) +{ + struct usbhid_device *usbhid = hid->driver_data; + struct usb_device *dev = hid_to_usb_dev(hid); + int actual_length, skipped_report_id = 0, ret; + + if (!usbhid->urbout) + return -ENOSYS; + + if (buf[0] == 0x0) { + /* Don't send the Report ID */ + buf++; + count--; + skipped_report_id = 1; + } + + ret = usb_interrupt_msg(dev, usbhid->urbout->pipe, + buf, count, &actual_length, + USB_CTRL_SET_TIMEOUT); + /* return the number of bytes transferred */ + if (ret == 0) { + ret = actual_length; + /* count also the report id */ + if (skipped_report_id) + ret++; + } + + return ret; +} + +static void usbhid_restart_queues(struct usbhid_device *usbhid) +{ + if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)) + usbhid_restart_out_queue(usbhid); + if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) + usbhid_restart_ctrl_queue(usbhid); +} + +static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma); + usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma); + kfree(usbhid->cr); + usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma); +} + +static int usbhid_parse(struct hid_device *hid) +{ + struct usb_interface *intf = to_usb_interface(hid->dev.parent); + struct usb_host_interface *interface = intf->cur_altsetting; + struct usb_device *dev = interface_to_usbdev (intf); + struct hid_descriptor *hdesc; + u32 quirks = 0; + unsigned int rsize = 0; + char *rdesc; + int ret, n; + + quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor), + le16_to_cpu(dev->descriptor.idProduct)); + + if (quirks & HID_QUIRK_IGNORE) + return -ENODEV; + + /* Many keyboards and mice don't like to be polled for reports, + * so we will always set the HID_QUIRK_NOGET flag for them. */ + if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) { + if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD || + interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE) + quirks |= HID_QUIRK_NOGET; + } + + if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) && + (!interface->desc.bNumEndpoints || + usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) { + dbg_hid("class descriptor not present\n"); + return -ENODEV; + } + + hid->version = le16_to_cpu(hdesc->bcdHID); + hid->country = hdesc->bCountryCode; + + for (n = 0; n < hdesc->bNumDescriptors; n++) + if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT) + rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength); + + if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { + dbg_hid("weird size of report descriptor (%u)\n", rsize); + return -EINVAL; + } + + if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) { + dbg_hid("couldn't allocate rdesc memory\n"); + return -ENOMEM; + } + + hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0); + + ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber, + HID_DT_REPORT, rdesc, rsize); + if (ret < 0) { + dbg_hid("reading report descriptor failed\n"); + kfree(rdesc); + goto err; + } + + ret = hid_parse_report(hid, rdesc, rsize); + kfree(rdesc); + if (ret) { + dbg_hid("parsing report descriptor failed\n"); + goto err; + } + + hid->quirks |= quirks; + + return 0; +err: + return ret; +} + +static int usbhid_start(struct hid_device *hid) +{ + struct usb_interface *intf = to_usb_interface(hid->dev.parent); + struct usb_host_interface *interface = intf->cur_altsetting; + struct usb_device *dev = interface_to_usbdev(intf); + struct usbhid_device *usbhid = hid->driver_data; + unsigned int n, insize = 0; + int ret; + + clear_bit(HID_DISCONNECTED, &usbhid->iofl); + + usbhid->bufsize = HID_MIN_BUFFER_SIZE; + hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize); + hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize); + hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize); + + if (usbhid->bufsize > HID_MAX_BUFFER_SIZE) + usbhid->bufsize = HID_MAX_BUFFER_SIZE; + + hid_find_max_report(hid, HID_INPUT_REPORT, &insize); + + if (insize > HID_MAX_BUFFER_SIZE) + insize = HID_MAX_BUFFER_SIZE; + + if (hid_alloc_buffers(dev, hid)) { + ret = -ENOMEM; + goto fail; + } + + for (n = 0; n < interface->desc.bNumEndpoints; n++) { + struct usb_endpoint_descriptor *endpoint; + int pipe; + int interval; + + endpoint = &interface->endpoint[n].desc; + if (!usb_endpoint_xfer_int(endpoint)) + continue; + + interval = endpoint->bInterval; + + /* Some vendors give fullspeed interval on highspeed devides */ + if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL && + dev->speed == USB_SPEED_HIGH) { + interval = fls(endpoint->bInterval*8); + printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n", + hid->name, endpoint->bInterval, interval); + } + + /* Change the polling interval of mice. */ + if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0) + interval = hid_mousepoll_interval; + + ret = -ENOMEM; + if (usb_endpoint_dir_in(endpoint)) { + if (usbhid->urbin) + continue; + if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL))) + goto fail; + pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress); + usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize, + hid_irq_in, hid, interval); + usbhid->urbin->transfer_dma = usbhid->inbuf_dma; + usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + } else { + if (usbhid->urbout) + continue; + if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL))) + goto fail; + pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress); + usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0, + hid_irq_out, hid, interval); + usbhid->urbout->transfer_dma = usbhid->outbuf_dma; + usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + } + } + + usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL); + if (!usbhid->urbctrl) { + ret = -ENOMEM; + goto fail; + } + + usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr, + usbhid->ctrlbuf, 1, hid_ctrl, hid); + usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma; + usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS)) + usbhid_init_reports(hid); + + set_bit(HID_STARTED, &usbhid->iofl); + + if (hid->quirks & HID_QUIRK_ALWAYS_POLL) { + ret = usb_autopm_get_interface(usbhid->intf); + if (ret) + goto fail; + usbhid->intf->needs_remote_wakeup = 1; + ret = hid_start_in(hid); + if (ret) { + dev_err(&hid->dev, + "failed to start in urb: %d\n", ret); + } + usb_autopm_put_interface(usbhid->intf); + } + + /* Some keyboards don't work until their LEDs have been set. + * Since BIOSes do set the LEDs, it must be safe for any device + * that supports the keyboard boot protocol. + * In addition, enable remote wakeup by default for all keyboard + * devices supporting the boot protocol. + */ + if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT && + interface->desc.bInterfaceProtocol == + USB_INTERFACE_PROTOCOL_KEYBOARD) { + usbhid_set_leds(hid); + device_set_wakeup_enable(&dev->dev, 1); + } + return 0; + +fail: + usb_free_urb(usbhid->urbin); + usb_free_urb(usbhid->urbout); + usb_free_urb(usbhid->urbctrl); + usbhid->urbin = NULL; + usbhid->urbout = NULL; + usbhid->urbctrl = NULL; + hid_free_buffers(dev, hid); + return ret; +} + +static void usbhid_stop(struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + if (WARN_ON(!usbhid)) + return; + + if (hid->quirks & HID_QUIRK_ALWAYS_POLL) + usbhid->intf->needs_remote_wakeup = 0; + + clear_bit(HID_STARTED, &usbhid->iofl); + spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */ + set_bit(HID_DISCONNECTED, &usbhid->iofl); + spin_unlock_irq(&usbhid->lock); + usb_kill_urb(usbhid->urbin); + usb_kill_urb(usbhid->urbout); + usb_kill_urb(usbhid->urbctrl); + + hid_cancel_delayed_stuff(usbhid); + + hid->claimed = 0; + + usb_free_urb(usbhid->urbin); + usb_free_urb(usbhid->urbctrl); + usb_free_urb(usbhid->urbout); + usbhid->urbin = NULL; /* don't mess up next start */ + usbhid->urbctrl = NULL; + usbhid->urbout = NULL; + + hid_free_buffers(hid_to_usb_dev(hid), hid); +} + +static int usbhid_power(struct hid_device *hid, int lvl) +{ + int r = 0; + + switch (lvl) { + case PM_HINT_FULLON: + r = usbhid_get_power(hid); + break; + case PM_HINT_NORMAL: + usbhid_put_power(hid); + break; + } + return r; +} + +static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype) +{ + switch (reqtype) { + case HID_REQ_GET_REPORT: + usbhid_submit_report(hid, rep, USB_DIR_IN); + break; + case HID_REQ_SET_REPORT: + usbhid_submit_report(hid, rep, USB_DIR_OUT); + break; + } +} + +static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum, + __u8 *buf, size_t len, unsigned char rtype, + int reqtype) +{ + switch (reqtype) { + case HID_REQ_GET_REPORT: + return usbhid_get_raw_report(hid, reportnum, buf, len, rtype); + case HID_REQ_SET_REPORT: + return usbhid_set_raw_report(hid, reportnum, buf, len, rtype); + default: + return -EIO; + } +} + +static int usbhid_idle(struct hid_device *hid, int report, int idle, + int reqtype) +{ + struct usb_device *dev = hid_to_usb_dev(hid); + struct usb_interface *intf = to_usb_interface(hid->dev.parent); + struct usb_host_interface *interface = intf->cur_altsetting; + int ifnum = interface->desc.bInterfaceNumber; + + if (reqtype != HID_REQ_SET_IDLE) + return -EINVAL; + + return hid_set_idle(dev, ifnum, report, idle); +} + +static struct hid_ll_driver usb_hid_driver = { + .parse = usbhid_parse, + .start = usbhid_start, + .stop = usbhid_stop, + .open = usbhid_open, + .close = usbhid_close, + .power = usbhid_power, + .request = usbhid_request, + .wait = usbhid_wait_io, + .raw_request = usbhid_raw_request, + .output_report = usbhid_output_report, + .idle = usbhid_idle, +}; + +static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + struct usb_host_interface *interface = intf->cur_altsetting; + struct usb_device *dev = interface_to_usbdev(intf); + struct usbhid_device *usbhid; + struct hid_device *hid; + unsigned int n, has_in = 0; + size_t len; + int ret; + + dbg_hid("HID probe called for ifnum %d\n", + intf->altsetting->desc.bInterfaceNumber); + + for (n = 0; n < interface->desc.bNumEndpoints; n++) + if (usb_endpoint_is_int_in(&interface->endpoint[n].desc)) + has_in++; + if (!has_in) { + hid_err(intf, "couldn't find an input interrupt endpoint\n"); + return -ENODEV; + } + + hid = hid_allocate_device(); + if (IS_ERR(hid)) + return PTR_ERR(hid); + + usb_set_intfdata(intf, hid); + hid->ll_driver = &usb_hid_driver; + hid->ff_init = hid_pidff_init; +#ifdef CONFIG_USB_HIDDEV + hid->hiddev_connect = hiddev_connect; + hid->hiddev_disconnect = hiddev_disconnect; + hid->hiddev_hid_event = hiddev_hid_event; + hid->hiddev_report_event = hiddev_report_event; +#endif + hid->dev.parent = &intf->dev; + hid->bus = BUS_USB; + hid->vendor = le16_to_cpu(dev->descriptor.idVendor); + hid->product = le16_to_cpu(dev->descriptor.idProduct); + hid->name[0] = 0; + hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product); + if (intf->cur_altsetting->desc.bInterfaceProtocol == + USB_INTERFACE_PROTOCOL_MOUSE) + hid->type = HID_TYPE_USBMOUSE; + else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0) + hid->type = HID_TYPE_USBNONE; + + if (dev->manufacturer) + strlcpy(hid->name, dev->manufacturer, sizeof(hid->name)); + + if (dev->product) { + if (dev->manufacturer) + strlcat(hid->name, " ", sizeof(hid->name)); + strlcat(hid->name, dev->product, sizeof(hid->name)); + } + + if (!strlen(hid->name)) + snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x", + le16_to_cpu(dev->descriptor.idVendor), + le16_to_cpu(dev->descriptor.idProduct)); + + usb_make_path(dev, hid->phys, sizeof(hid->phys)); + strlcat(hid->phys, "/input", sizeof(hid->phys)); + len = strlen(hid->phys); + if (len < sizeof(hid->phys) - 1) + snprintf(hid->phys + len, sizeof(hid->phys) - len, + "%d", intf->altsetting[0].desc.bInterfaceNumber); + + if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0) + hid->uniq[0] = 0; + + usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL); + if (usbhid == NULL) { + ret = -ENOMEM; + goto err; + } + + hid->driver_data = usbhid; + usbhid->hid = hid; + usbhid->intf = intf; + usbhid->ifnum = interface->desc.bInterfaceNumber; + + init_waitqueue_head(&usbhid->wait); + INIT_WORK(&usbhid->reset_work, hid_reset); + setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid); + spin_lock_init(&usbhid->lock); + + ret = hid_add_device(hid); + if (ret) { + if (ret != -ENODEV) + hid_err(intf, "can't add hid device: %d\n", ret); + goto err_free; + } + + return 0; +err_free: + kfree(usbhid); +err: + hid_destroy_device(hid); + return ret; +} + +static void usbhid_disconnect(struct usb_interface *intf) +{ + struct hid_device *hid = usb_get_intfdata(intf); + struct usbhid_device *usbhid; + + if (WARN_ON(!hid)) + return; + + usbhid = hid->driver_data; + spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */ + set_bit(HID_DISCONNECTED, &usbhid->iofl); + spin_unlock_irq(&usbhid->lock); + hid_destroy_device(hid); + kfree(usbhid); +} + +static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid) +{ + del_timer_sync(&usbhid->io_retry); + cancel_work_sync(&usbhid->reset_work); +} + +static void hid_cease_io(struct usbhid_device *usbhid) +{ + del_timer_sync(&usbhid->io_retry); + usb_kill_urb(usbhid->urbin); + usb_kill_urb(usbhid->urbctrl); + usb_kill_urb(usbhid->urbout); +} + +/* Treat USB reset pretty much the same as suspend/resume */ +static int hid_pre_reset(struct usb_interface *intf) +{ + struct hid_device *hid = usb_get_intfdata(intf); + struct usbhid_device *usbhid = hid->driver_data; + + spin_lock_irq(&usbhid->lock); + set_bit(HID_RESET_PENDING, &usbhid->iofl); + spin_unlock_irq(&usbhid->lock); + hid_cease_io(usbhid); + + return 0; +} + +/* Same routine used for post_reset and reset_resume */ +static int hid_post_reset(struct usb_interface *intf) +{ + struct usb_device *dev = interface_to_usbdev (intf); + struct hid_device *hid = usb_get_intfdata(intf); + struct usbhid_device *usbhid = hid->driver_data; + struct usb_host_interface *interface = intf->cur_altsetting; + int status; + char *rdesc; + + /* Fetch and examine the HID report descriptor. If this + * has changed, then rebind. Since usbcore's check of the + * configuration descriptors passed, we already know that + * the size of the HID report descriptor has not changed. + */ + rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL); + if (!rdesc) { + dbg_hid("couldn't allocate rdesc memory (post_reset)\n"); + return 1; + } + status = hid_get_class_descriptor(dev, + interface->desc.bInterfaceNumber, + HID_DT_REPORT, rdesc, hid->dev_rsize); + if (status < 0) { + dbg_hid("reading report descriptor failed (post_reset)\n"); + kfree(rdesc); + return 1; + } + status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize); + kfree(rdesc); + if (status != 0) { + dbg_hid("report descriptor changed\n"); + return 1; + } + + spin_lock_irq(&usbhid->lock); + clear_bit(HID_RESET_PENDING, &usbhid->iofl); + spin_unlock_irq(&usbhid->lock); + hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0); + status = hid_start_in(hid); + if (status < 0) + hid_io_error(hid); + usbhid_restart_queues(usbhid); + + return 0; +} + +int usbhid_get_power(struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + return usb_autopm_get_interface(usbhid->intf); +} + +void usbhid_put_power(struct hid_device *hid) +{ + struct usbhid_device *usbhid = hid->driver_data; + + usb_autopm_put_interface(usbhid->intf); +} + + +#ifdef CONFIG_PM +static int hid_resume_common(struct hid_device *hid, bool driver_suspended) +{ + struct usbhid_device *usbhid = hid->driver_data; + int status; + + spin_lock_irq(&usbhid->lock); + clear_bit(HID_SUSPENDED, &usbhid->iofl); + usbhid_mark_busy(usbhid); + + if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) || + test_bit(HID_RESET_PENDING, &usbhid->iofl)) + schedule_work(&usbhid->reset_work); + usbhid->retry_delay = 0; + + usbhid_restart_queues(usbhid); + spin_unlock_irq(&usbhid->lock); + + status = hid_start_in(hid); + if (status < 0) + hid_io_error(hid); + + if (driver_suspended && hid->driver && hid->driver->resume) + status = hid->driver->resume(hid); + return status; +} + +static int hid_suspend(struct usb_interface *intf, pm_message_t message) +{ + struct hid_device *hid = usb_get_intfdata(intf); + struct usbhid_device *usbhid = hid->driver_data; + int status = 0; + bool driver_suspended = false; + unsigned int ledcount; + + if (PMSG_IS_AUTO(message)) { + ledcount = hidinput_count_leds(hid); + spin_lock_irq(&usbhid->lock); /* Sync with error handler */ + if (!test_bit(HID_RESET_PENDING, &usbhid->iofl) + && !test_bit(HID_CLEAR_HALT, &usbhid->iofl) + && !test_bit(HID_OUT_RUNNING, &usbhid->iofl) + && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl) + && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl) + && (!ledcount || ignoreled)) + { + set_bit(HID_SUSPENDED, &usbhid->iofl); + spin_unlock_irq(&usbhid->lock); + if (hid->driver && hid->driver->suspend) { + status = hid->driver->suspend(hid, message); + if (status < 0) + goto failed; + } + driver_suspended = true; + } else { + usbhid_mark_busy(usbhid); + spin_unlock_irq(&usbhid->lock); + return -EBUSY; + } + + } else { + /* TODO: resume() might need to handle suspend failure */ + if (hid->driver && hid->driver->suspend) + status = hid->driver->suspend(hid, message); + driver_suspended = true; + spin_lock_irq(&usbhid->lock); + set_bit(HID_SUSPENDED, &usbhid->iofl); + spin_unlock_irq(&usbhid->lock); + if (usbhid_wait_io(hid) < 0) + status = -EIO; + } + + hid_cancel_delayed_stuff(usbhid); + hid_cease_io(usbhid); + + if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) { + /* lost race against keypresses */ + status = -EBUSY; + goto failed; + } + dev_dbg(&intf->dev, "suspend\n"); + return status; + + failed: + hid_resume_common(hid, driver_suspended); + return status; +} + +static int hid_resume(struct usb_interface *intf) +{ + struct hid_device *hid = usb_get_intfdata (intf); + struct usbhid_device *usbhid = hid->driver_data; + int status; + + if (!test_bit(HID_STARTED, &usbhid->iofl)) + return 0; + + status = hid_resume_common(hid, true); + dev_dbg(&intf->dev, "resume status %d\n", status); + return 0; +} + +static int hid_reset_resume(struct usb_interface *intf) +{ + struct hid_device *hid = usb_get_intfdata(intf); + struct usbhid_device *usbhid = hid->driver_data; + int status; + + clear_bit(HID_SUSPENDED, &usbhid->iofl); + status = hid_post_reset(intf); + if (status >= 0 && hid->driver && hid->driver->reset_resume) { + int ret = hid->driver->reset_resume(hid); + if (ret < 0) + status = ret; + } + return status; +} + +#endif /* CONFIG_PM */ + +static const struct usb_device_id hid_usb_ids[] = { + { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, + .bInterfaceClass = USB_INTERFACE_CLASS_HID }, + { } /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE (usb, hid_usb_ids); + +static struct usb_driver hid_driver = { + .name = "usbhid", + .probe = usbhid_probe, + .disconnect = usbhid_disconnect, +#ifdef CONFIG_PM + .suspend = hid_suspend, + .resume = hid_resume, + .reset_resume = hid_reset_resume, +#endif + .pre_reset = hid_pre_reset, + .post_reset = hid_post_reset, + .id_table = hid_usb_ids, + .supports_autosuspend = 1, +}; + +struct usb_interface *usbhid_find_interface(int minor) +{ + return usb_find_interface(&hid_driver, minor); +} + +static int __init hid_init(void) +{ + int retval = -ENOMEM; + + retval = usbhid_quirks_init(quirks_param); + if (retval) + goto usbhid_quirks_init_fail; + retval = usb_register(&hid_driver); + if (retval) + goto usb_register_fail; + printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); + + return 0; +usb_register_fail: + usbhid_quirks_exit(); +usbhid_quirks_init_fail: + return retval; +} + +static void __exit hid_exit(void) +{ + usb_deregister(&hid_driver); + usbhid_quirks_exit(); +} + +module_init(hid_init); +module_exit(hid_exit); + +MODULE_AUTHOR("Andreas Gal"); +MODULE_AUTHOR("Vojtech Pavlik"); +MODULE_AUTHOR("Jiri Kosina"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE(DRIVER_LICENSE); |