diff options
Diffstat (limited to 'drivers/input/xen-kbdfront.c')
| -rw-r--r-- | drivers/input/xen-kbdfront.c | 364 |
1 files changed, 0 insertions, 364 deletions
diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c deleted file mode 100644 index 7f85a862ad11..000000000000 --- a/drivers/input/xen-kbdfront.c +++ /dev/null @@ -1,364 +0,0 @@ -/* - * Xen para-virtual input device - * - * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com> - * Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com> - * - * Based on linux/drivers/input/mouse/sermouse.c - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file COPYING in the main directory of this archive for - * more details. - */ - -/* - * TODO: - * - * Switch to grant tables together with xen-fbfront.c. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/module.h> -#include <linux/input.h> -#include <linux/slab.h> - -#include <asm/xen/hypervisor.h> - -#include <xen/xen.h> -#include <xen/events.h> -#include <xen/page.h> -#include <xen/interface/io/fbif.h> -#include <xen/interface/io/kbdif.h> -#include <xen/xenbus.h> - -struct xenkbd_info { - struct input_dev *kbd; - struct input_dev *ptr; - struct xenkbd_page *page; - int irq; - struct xenbus_device *xbdev; - char phys[32]; -}; - -static int xenkbd_remove(struct xenbus_device *); -static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *); -static void xenkbd_disconnect_backend(struct xenkbd_info *); - -/* - * Note: if you need to send out events, see xenfb_do_update() for how - * to do that. - */ - -static irqreturn_t input_handler(int rq, void *dev_id) -{ - struct xenkbd_info *info = dev_id; - struct xenkbd_page *page = info->page; - __u32 cons, prod; - - prod = page->in_prod; - if (prod == page->in_cons) - return IRQ_HANDLED; - rmb(); /* ensure we see ring contents up to prod */ - for (cons = page->in_cons; cons != prod; cons++) { - union xenkbd_in_event *event; - struct input_dev *dev; - event = &XENKBD_IN_RING_REF(page, cons); - - dev = info->ptr; - switch (event->type) { - case XENKBD_TYPE_MOTION: - input_report_rel(dev, REL_X, event->motion.rel_x); - input_report_rel(dev, REL_Y, event->motion.rel_y); - if (event->motion.rel_z) - input_report_rel(dev, REL_WHEEL, - -event->motion.rel_z); - break; - case XENKBD_TYPE_KEY: - dev = NULL; - if (test_bit(event->key.keycode, info->kbd->keybit)) - dev = info->kbd; - if (test_bit(event->key.keycode, info->ptr->keybit)) - dev = info->ptr; - if (dev) - input_report_key(dev, event->key.keycode, - event->key.pressed); - else - pr_warning("unhandled keycode 0x%x\n", - event->key.keycode); - break; - case XENKBD_TYPE_POS: - input_report_abs(dev, ABS_X, event->pos.abs_x); - input_report_abs(dev, ABS_Y, event->pos.abs_y); - if (event->pos.rel_z) - input_report_rel(dev, REL_WHEEL, - -event->pos.rel_z); - break; - } - if (dev) - input_sync(dev); - } - mb(); /* ensure we got ring contents */ - page->in_cons = cons; - notify_remote_via_irq(info->irq); - - return IRQ_HANDLED; -} - -static int __devinit xenkbd_probe(struct xenbus_device *dev, - const struct xenbus_device_id *id) -{ - int ret, i; - struct xenkbd_info *info; - struct input_dev *kbd, *ptr; - - info = kzalloc(sizeof(*info), GFP_KERNEL); - if (!info) { - xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); - return -ENOMEM; - } - dev_set_drvdata(&dev->dev, info); - info->xbdev = dev; - info->irq = -1; - snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename); - - info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); - if (!info->page) - goto error_nomem; - - /* keyboard */ - kbd = input_allocate_device(); - if (!kbd) - goto error_nomem; - kbd->name = "Xen Virtual Keyboard"; - kbd->phys = info->phys; - kbd->id.bustype = BUS_PCI; - kbd->id.vendor = 0x5853; - kbd->id.product = 0xffff; - kbd->evbit[0] = BIT(EV_KEY); - for (i = KEY_ESC; i < KEY_UNKNOWN; i++) - set_bit(i, kbd->keybit); - for (i = KEY_OK; i < KEY_MAX; i++) - set_bit(i, kbd->keybit); - - ret = input_register_device(kbd); - if (ret) { - input_free_device(kbd); - xenbus_dev_fatal(dev, ret, "input_register_device(kbd)"); - goto error; - } - info->kbd = kbd; - - /* pointing device */ - ptr = input_allocate_device(); - if (!ptr) - goto error_nomem; - ptr->name = "Xen Virtual Pointer"; - ptr->phys = info->phys; - ptr->id.bustype = BUS_PCI; - ptr->id.vendor = 0x5853; - ptr->id.product = 0xfffe; - ptr->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS); - for (i = BTN_LEFT; i <= BTN_TASK; i++) - set_bit(i, ptr->keybit); - ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y) | BIT(REL_WHEEL); - input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0); - input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0); - - ret = input_register_device(ptr); - if (ret) { - input_free_device(ptr); - xenbus_dev_fatal(dev, ret, "input_register_device(ptr)"); - goto error; - } - info->ptr = ptr; - - ret = xenkbd_connect_backend(dev, info); - if (ret < 0) - goto error; - - return 0; - - error_nomem: - ret = -ENOMEM; - xenbus_dev_fatal(dev, ret, "allocating device memory"); - error: - xenkbd_remove(dev); - return ret; -} - -static int xenkbd_resume(struct xenbus_device *dev) -{ - struct xenkbd_info *info = dev_get_drvdata(&dev->dev); - - xenkbd_disconnect_backend(info); - memset(info->page, 0, PAGE_SIZE); - return xenkbd_connect_backend(dev, info); -} - -static int xenkbd_remove(struct xenbus_device *dev) -{ - struct xenkbd_info *info = dev_get_drvdata(&dev->dev); - - xenkbd_disconnect_backend(info); - if (info->kbd) - input_unregister_device(info->kbd); - if (info->ptr) - input_unregister_device(info->ptr); - free_page((unsigned long)info->page); - kfree(info); - return 0; -} - -static int xenkbd_connect_backend(struct xenbus_device *dev, - struct xenkbd_info *info) -{ - int ret, evtchn; - struct xenbus_transaction xbt; - - ret = xenbus_alloc_evtchn(dev, &evtchn); - if (ret) - return ret; - ret = bind_evtchn_to_irqhandler(evtchn, input_handler, - 0, dev->devicetype, info); - if (ret < 0) { - xenbus_free_evtchn(dev, evtchn); - xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); - return ret; - } - info->irq = ret; - - again: - ret = xenbus_transaction_start(&xbt); - if (ret) { - xenbus_dev_fatal(dev, ret, "starting transaction"); - return ret; - } - ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", - virt_to_mfn(info->page)); - if (ret) - goto error_xenbus; - ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", - evtchn); - if (ret) - goto error_xenbus; - ret = xenbus_transaction_end(xbt, 0); - if (ret) { - if (ret == -EAGAIN) - goto again; - xenbus_dev_fatal(dev, ret, "completing transaction"); - return ret; - } - - xenbus_switch_state(dev, XenbusStateInitialised); - return 0; - - error_xenbus: - xenbus_transaction_end(xbt, 1); - xenbus_dev_fatal(dev, ret, "writing xenstore"); - return ret; -} - -static void xenkbd_disconnect_backend(struct xenkbd_info *info) -{ - if (info->irq >= 0) - unbind_from_irqhandler(info->irq, info); - info->irq = -1; -} - -static void xenkbd_backend_changed(struct xenbus_device *dev, - enum xenbus_state backend_state) -{ - struct xenkbd_info *info = dev_get_drvdata(&dev->dev); - int ret, val; - - switch (backend_state) { - case XenbusStateInitialising: - case XenbusStateInitialised: - case XenbusStateReconfiguring: - case XenbusStateReconfigured: - case XenbusStateUnknown: - case XenbusStateClosed: - break; - - case XenbusStateInitWait: -InitWait: - ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "feature-abs-pointer", "%d", &val); - if (ret < 0) - val = 0; - if (val) { - ret = xenbus_printf(XBT_NIL, info->xbdev->nodename, - "request-abs-pointer", "1"); - if (ret) - pr_warning("can't request abs-pointer\n"); - } - xenbus_switch_state(dev, XenbusStateConnected); - break; - - case XenbusStateConnected: - /* - * Work around xenbus race condition: If backend goes - * through InitWait to Connected fast enough, we can - * get Connected twice here. - */ - if (dev->state != XenbusStateConnected) - goto InitWait; /* no InitWait seen yet, fudge it */ - - /* Set input abs params to match backend screen res */ - if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "width", "%d", &val) > 0) - input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0); - - if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "height", "%d", &val) > 0) - input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0); - - break; - - case XenbusStateClosing: - xenbus_frontend_closed(dev); - break; - } -} - -static const struct xenbus_device_id xenkbd_ids[] = { - { "vkbd" }, - { "" } -}; - -static struct xenbus_driver xenkbd_driver = { - .name = "vkbd", - .owner = THIS_MODULE, - .ids = xenkbd_ids, - .probe = xenkbd_probe, - .remove = xenkbd_remove, - .resume = xenkbd_resume, - .otherend_changed = xenkbd_backend_changed, -}; - -static int __init xenkbd_init(void) -{ - if (!xen_pv_domain()) - return -ENODEV; - - /* Nothing to do if running in dom0. */ - if (xen_initial_domain()) - return -ENODEV; - - return xenbus_register_frontend(&xenkbd_driver); -} - -static void __exit xenkbd_cleanup(void) -{ - xenbus_unregister_driver(&xenkbd_driver); -} - -module_init(xenkbd_init); -module_exit(xenkbd_cleanup); - -MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("xen:vkbd"); |