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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. Notice that in this particular case, I placed the "fall through" part at the beginning of the code comment, which is what GCC is expecting to find. Addresses-Coverity-ID: 114757 ("Missing break in switch") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
572 lines
14 KiB
C
572 lines
14 KiB
C
/*
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* Xen para-virtual input device
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*
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* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
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* Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
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*
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* Based on linux/drivers/input/mouse/sermouse.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/slab.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
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#include <xen/events.h>
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#include <xen/page.h>
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#include <xen/grant_table.h>
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#include <xen/interface/grant_table.h>
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#include <xen/interface/io/fbif.h>
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#include <xen/interface/io/kbdif.h>
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#include <xen/xenbus.h>
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#include <xen/platform_pci.h>
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struct xenkbd_info {
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struct input_dev *kbd;
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struct input_dev *ptr;
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struct input_dev *mtouch;
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struct xenkbd_page *page;
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int gref;
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int irq;
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struct xenbus_device *xbdev;
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char phys[32];
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/* current MT slot/contact ID we are injecting events in */
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int mtouch_cur_contact_id;
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};
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enum { KPARAM_X, KPARAM_Y, KPARAM_CNT };
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static int ptr_size[KPARAM_CNT] = { XENFB_WIDTH, XENFB_HEIGHT };
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module_param_array(ptr_size, int, NULL, 0444);
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MODULE_PARM_DESC(ptr_size,
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"Pointing device width, height in pixels (default 800,600)");
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static int xenkbd_remove(struct xenbus_device *);
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static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
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static void xenkbd_disconnect_backend(struct xenkbd_info *);
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/*
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* Note: if you need to send out events, see xenfb_do_update() for how
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* to do that.
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*/
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static void xenkbd_handle_motion_event(struct xenkbd_info *info,
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struct xenkbd_motion *motion)
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{
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if (unlikely(!info->ptr))
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return;
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input_report_rel(info->ptr, REL_X, motion->rel_x);
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input_report_rel(info->ptr, REL_Y, motion->rel_y);
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if (motion->rel_z)
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input_report_rel(info->ptr, REL_WHEEL, -motion->rel_z);
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input_sync(info->ptr);
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}
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static void xenkbd_handle_position_event(struct xenkbd_info *info,
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struct xenkbd_position *pos)
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{
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if (unlikely(!info->ptr))
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return;
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input_report_abs(info->ptr, ABS_X, pos->abs_x);
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input_report_abs(info->ptr, ABS_Y, pos->abs_y);
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if (pos->rel_z)
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input_report_rel(info->ptr, REL_WHEEL, -pos->rel_z);
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input_sync(info->ptr);
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}
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static void xenkbd_handle_key_event(struct xenkbd_info *info,
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struct xenkbd_key *key)
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{
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struct input_dev *dev;
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int value = key->pressed;
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if (test_bit(key->keycode, info->ptr->keybit)) {
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dev = info->ptr;
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} else if (test_bit(key->keycode, info->kbd->keybit)) {
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dev = info->kbd;
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if (key->pressed && test_bit(key->keycode, info->kbd->key))
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value = 2; /* Mark as autorepeat */
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} else {
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pr_warn("unhandled keycode 0x%x\n", key->keycode);
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return;
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}
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if (unlikely(!dev))
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return;
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input_event(dev, EV_KEY, key->keycode, value);
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input_sync(dev);
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}
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static void xenkbd_handle_mt_event(struct xenkbd_info *info,
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struct xenkbd_mtouch *mtouch)
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{
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if (unlikely(!info->mtouch))
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return;
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if (mtouch->contact_id != info->mtouch_cur_contact_id) {
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info->mtouch_cur_contact_id = mtouch->contact_id;
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input_mt_slot(info->mtouch, mtouch->contact_id);
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}
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switch (mtouch->event_type) {
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case XENKBD_MT_EV_DOWN:
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input_mt_report_slot_state(info->mtouch, MT_TOOL_FINGER, true);
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/* fall through */
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case XENKBD_MT_EV_MOTION:
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input_report_abs(info->mtouch, ABS_MT_POSITION_X,
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mtouch->u.pos.abs_x);
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input_report_abs(info->mtouch, ABS_MT_POSITION_Y,
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mtouch->u.pos.abs_y);
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break;
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case XENKBD_MT_EV_SHAPE:
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input_report_abs(info->mtouch, ABS_MT_TOUCH_MAJOR,
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mtouch->u.shape.major);
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input_report_abs(info->mtouch, ABS_MT_TOUCH_MINOR,
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mtouch->u.shape.minor);
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break;
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case XENKBD_MT_EV_ORIENT:
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input_report_abs(info->mtouch, ABS_MT_ORIENTATION,
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mtouch->u.orientation);
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break;
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case XENKBD_MT_EV_UP:
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input_mt_report_slot_state(info->mtouch, MT_TOOL_FINGER, false);
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break;
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case XENKBD_MT_EV_SYN:
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input_mt_sync_frame(info->mtouch);
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input_sync(info->mtouch);
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break;
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}
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}
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static void xenkbd_handle_event(struct xenkbd_info *info,
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union xenkbd_in_event *event)
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{
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switch (event->type) {
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case XENKBD_TYPE_MOTION:
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xenkbd_handle_motion_event(info, &event->motion);
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break;
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case XENKBD_TYPE_KEY:
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xenkbd_handle_key_event(info, &event->key);
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break;
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case XENKBD_TYPE_POS:
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xenkbd_handle_position_event(info, &event->pos);
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break;
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case XENKBD_TYPE_MTOUCH:
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xenkbd_handle_mt_event(info, &event->mtouch);
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break;
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}
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}
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static irqreturn_t input_handler(int rq, void *dev_id)
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{
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struct xenkbd_info *info = dev_id;
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struct xenkbd_page *page = info->page;
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__u32 cons, prod;
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prod = page->in_prod;
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if (prod == page->in_cons)
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return IRQ_HANDLED;
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rmb(); /* ensure we see ring contents up to prod */
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for (cons = page->in_cons; cons != prod; cons++)
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xenkbd_handle_event(info, &XENKBD_IN_RING_REF(page, cons));
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mb(); /* ensure we got ring contents */
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page->in_cons = cons;
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notify_remote_via_irq(info->irq);
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return IRQ_HANDLED;
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}
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static int xenkbd_probe(struct xenbus_device *dev,
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const struct xenbus_device_id *id)
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{
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int ret, i;
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bool with_mtouch, with_kbd, with_ptr;
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struct xenkbd_info *info;
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struct input_dev *kbd, *ptr, *mtouch;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
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return -ENOMEM;
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}
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dev_set_drvdata(&dev->dev, info);
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info->xbdev = dev;
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info->irq = -1;
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info->gref = -1;
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snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
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info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
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if (!info->page)
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goto error_nomem;
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/*
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* The below are reverse logic, e.g. if the feature is set, then
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* do not expose the corresponding virtual device.
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*/
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with_kbd = !xenbus_read_unsigned(dev->otherend,
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XENKBD_FIELD_FEAT_DSBL_KEYBRD, 0);
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with_ptr = !xenbus_read_unsigned(dev->otherend,
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XENKBD_FIELD_FEAT_DSBL_POINTER, 0);
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/* Direct logic: if set, then create multi-touch device. */
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with_mtouch = xenbus_read_unsigned(dev->otherend,
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XENKBD_FIELD_FEAT_MTOUCH, 0);
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if (with_mtouch) {
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ret = xenbus_write(XBT_NIL, dev->nodename,
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XENKBD_FIELD_REQ_MTOUCH, "1");
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if (ret) {
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pr_warn("xenkbd: can't request multi-touch");
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with_mtouch = 0;
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}
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}
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/* keyboard */
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if (with_kbd) {
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kbd = input_allocate_device();
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if (!kbd)
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goto error_nomem;
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kbd->name = "Xen Virtual Keyboard";
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kbd->phys = info->phys;
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kbd->id.bustype = BUS_PCI;
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kbd->id.vendor = 0x5853;
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kbd->id.product = 0xffff;
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__set_bit(EV_KEY, kbd->evbit);
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for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
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__set_bit(i, kbd->keybit);
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for (i = KEY_OK; i < KEY_MAX; i++)
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__set_bit(i, kbd->keybit);
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ret = input_register_device(kbd);
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if (ret) {
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input_free_device(kbd);
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xenbus_dev_fatal(dev, ret,
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"input_register_device(kbd)");
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goto error;
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}
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info->kbd = kbd;
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}
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/* pointing device */
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if (with_ptr) {
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unsigned int abs;
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/* Set input abs params to match backend screen res */
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abs = xenbus_read_unsigned(dev->otherend,
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XENKBD_FIELD_FEAT_ABS_POINTER, 0);
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ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend,
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XENKBD_FIELD_WIDTH,
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ptr_size[KPARAM_X]);
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ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend,
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XENKBD_FIELD_HEIGHT,
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ptr_size[KPARAM_Y]);
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if (abs) {
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ret = xenbus_write(XBT_NIL, dev->nodename,
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XENKBD_FIELD_REQ_ABS_POINTER, "1");
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if (ret) {
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pr_warn("xenkbd: can't request abs-pointer\n");
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abs = 0;
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}
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}
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ptr = input_allocate_device();
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if (!ptr)
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goto error_nomem;
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ptr->name = "Xen Virtual Pointer";
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ptr->phys = info->phys;
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ptr->id.bustype = BUS_PCI;
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ptr->id.vendor = 0x5853;
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ptr->id.product = 0xfffe;
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if (abs) {
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__set_bit(EV_ABS, ptr->evbit);
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input_set_abs_params(ptr, ABS_X, 0,
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ptr_size[KPARAM_X], 0, 0);
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input_set_abs_params(ptr, ABS_Y, 0,
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ptr_size[KPARAM_Y], 0, 0);
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} else {
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input_set_capability(ptr, EV_REL, REL_X);
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input_set_capability(ptr, EV_REL, REL_Y);
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}
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input_set_capability(ptr, EV_REL, REL_WHEEL);
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__set_bit(EV_KEY, ptr->evbit);
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for (i = BTN_LEFT; i <= BTN_TASK; i++)
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__set_bit(i, ptr->keybit);
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ret = input_register_device(ptr);
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if (ret) {
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input_free_device(ptr);
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xenbus_dev_fatal(dev, ret,
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"input_register_device(ptr)");
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goto error;
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}
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info->ptr = ptr;
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}
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/* multi-touch device */
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if (with_mtouch) {
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int num_cont, width, height;
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mtouch = input_allocate_device();
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if (!mtouch)
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goto error_nomem;
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num_cont = xenbus_read_unsigned(info->xbdev->otherend,
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XENKBD_FIELD_MT_NUM_CONTACTS,
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1);
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width = xenbus_read_unsigned(info->xbdev->otherend,
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XENKBD_FIELD_MT_WIDTH,
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XENFB_WIDTH);
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height = xenbus_read_unsigned(info->xbdev->otherend,
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XENKBD_FIELD_MT_HEIGHT,
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XENFB_HEIGHT);
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mtouch->name = "Xen Virtual Multi-touch";
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mtouch->phys = info->phys;
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mtouch->id.bustype = BUS_PCI;
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mtouch->id.vendor = 0x5853;
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mtouch->id.product = 0xfffd;
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input_set_abs_params(mtouch, ABS_MT_TOUCH_MAJOR,
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0, 255, 0, 0);
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input_set_abs_params(mtouch, ABS_MT_POSITION_X,
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0, width, 0, 0);
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input_set_abs_params(mtouch, ABS_MT_POSITION_Y,
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0, height, 0, 0);
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ret = input_mt_init_slots(mtouch, num_cont, INPUT_MT_DIRECT);
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if (ret) {
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input_free_device(mtouch);
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xenbus_dev_fatal(info->xbdev, ret,
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"input_mt_init_slots");
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goto error;
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}
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ret = input_register_device(mtouch);
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if (ret) {
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input_free_device(mtouch);
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xenbus_dev_fatal(info->xbdev, ret,
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"input_register_device(mtouch)");
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goto error;
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}
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info->mtouch_cur_contact_id = -1;
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info->mtouch = mtouch;
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}
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if (!(with_kbd || with_ptr || with_mtouch)) {
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ret = -ENXIO;
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goto error;
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}
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ret = xenkbd_connect_backend(dev, info);
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if (ret < 0)
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goto error;
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return 0;
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error_nomem:
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ret = -ENOMEM;
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xenbus_dev_fatal(dev, ret, "allocating device memory");
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error:
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xenkbd_remove(dev);
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return ret;
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}
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static int xenkbd_resume(struct xenbus_device *dev)
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{
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struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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xenkbd_disconnect_backend(info);
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memset(info->page, 0, PAGE_SIZE);
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return xenkbd_connect_backend(dev, info);
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}
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static int xenkbd_remove(struct xenbus_device *dev)
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{
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struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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xenkbd_disconnect_backend(info);
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if (info->kbd)
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input_unregister_device(info->kbd);
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if (info->ptr)
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input_unregister_device(info->ptr);
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if (info->mtouch)
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input_unregister_device(info->mtouch);
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free_page((unsigned long)info->page);
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kfree(info);
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return 0;
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}
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static int xenkbd_connect_backend(struct xenbus_device *dev,
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struct xenkbd_info *info)
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{
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int ret, evtchn;
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struct xenbus_transaction xbt;
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ret = gnttab_grant_foreign_access(dev->otherend_id,
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virt_to_gfn(info->page), 0);
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if (ret < 0)
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return ret;
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info->gref = ret;
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ret = xenbus_alloc_evtchn(dev, &evtchn);
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if (ret)
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goto error_grant;
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ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
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0, dev->devicetype, info);
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if (ret < 0) {
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xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
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goto error_evtchan;
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}
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info->irq = ret;
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again:
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ret = xenbus_transaction_start(&xbt);
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if (ret) {
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xenbus_dev_fatal(dev, ret, "starting transaction");
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goto error_irqh;
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}
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ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_REF, "%lu",
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virt_to_gfn(info->page));
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if (ret)
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goto error_xenbus;
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ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_GREF,
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"%u", info->gref);
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if (ret)
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goto error_xenbus;
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ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_EVT_CHANNEL, "%u",
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evtchn);
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if (ret)
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goto error_xenbus;
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ret = xenbus_transaction_end(xbt, 0);
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if (ret) {
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if (ret == -EAGAIN)
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goto again;
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xenbus_dev_fatal(dev, ret, "completing transaction");
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goto error_irqh;
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}
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xenbus_switch_state(dev, XenbusStateInitialised);
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return 0;
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error_xenbus:
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xenbus_transaction_end(xbt, 1);
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xenbus_dev_fatal(dev, ret, "writing xenstore");
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error_irqh:
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unbind_from_irqhandler(info->irq, info);
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info->irq = -1;
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error_evtchan:
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xenbus_free_evtchn(dev, evtchn);
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error_grant:
|
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gnttab_end_foreign_access(info->gref, 0, 0UL);
|
|
info->gref = -1;
|
|
return ret;
|
|
}
|
|
|
|
static void xenkbd_disconnect_backend(struct xenkbd_info *info)
|
|
{
|
|
if (info->irq >= 0)
|
|
unbind_from_irqhandler(info->irq, info);
|
|
info->irq = -1;
|
|
if (info->gref >= 0)
|
|
gnttab_end_foreign_access(info->gref, 0, 0UL);
|
|
info->gref = -1;
|
|
}
|
|
|
|
static void xenkbd_backend_changed(struct xenbus_device *dev,
|
|
enum xenbus_state backend_state)
|
|
{
|
|
switch (backend_state) {
|
|
case XenbusStateInitialising:
|
|
case XenbusStateInitialised:
|
|
case XenbusStateReconfiguring:
|
|
case XenbusStateReconfigured:
|
|
case XenbusStateUnknown:
|
|
break;
|
|
|
|
case XenbusStateInitWait:
|
|
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)
|
|
xenbus_switch_state(dev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
if (dev->state == XenbusStateClosed)
|
|
break;
|
|
/* fall through - Missed the backend's CLOSING state */
|
|
case XenbusStateClosing:
|
|
xenbus_frontend_closed(dev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const struct xenbus_device_id xenkbd_ids[] = {
|
|
{ XENKBD_DRIVER_NAME },
|
|
{ "" }
|
|
};
|
|
|
|
static struct xenbus_driver xenkbd_driver = {
|
|
.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_domain())
|
|
return -ENODEV;
|
|
|
|
/* Nothing to do if running in dom0. */
|
|
if (xen_initial_domain())
|
|
return -ENODEV;
|
|
|
|
if (!xen_has_pv_devices())
|
|
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:" XENKBD_DRIVER_NAME);
|