blob: a71b7bdcf83ff602af9772a48e0531f9990362e8 [file] [log] [blame]
/*
* Copyright © 2008-2011 Kristian Høgsberg
* Copyright © 2011 Intel Corporation
* Copyright © 2012 Raspberry Pi Foundation
* Copyright © 2013 Philip Withnall
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/input.h>
#include <assert.h>
#include <libudev.h>
#include "shared/helpers.h"
#include "compositor.h"
#include "compositor-fbdev.h"
#include "launcher-util.h"
#include "pixman-renderer.h"
#include "libinput-seat.h"
#include "presentation-time-server-protocol.h"
struct fbdev_backend {
struct weston_backend base;
struct weston_compositor *compositor;
uint32_t prev_state;
struct udev *udev;
struct udev_input input;
uint32_t output_transform;
struct wl_listener session_listener;
};
struct fbdev_screeninfo {
unsigned int x_resolution; /* pixels, visible area */
unsigned int y_resolution; /* pixels, visible area */
unsigned int width_mm; /* visible screen width in mm */
unsigned int height_mm; /* visible screen height in mm */
unsigned int bits_per_pixel;
size_t buffer_length; /* length of frame buffer memory in bytes */
size_t line_length; /* length of a line in bytes */
char id[16]; /* screen identifier */
pixman_format_code_t pixel_format; /* frame buffer pixel format */
unsigned int refresh_rate; /* Hertz */
};
struct fbdev_head {
struct weston_head base;
/* Frame buffer details. */
char *device;
struct fbdev_screeninfo fb_info;
};
struct fbdev_output {
struct fbdev_backend *backend;
struct weston_output base;
struct weston_mode mode;
struct wl_event_source *finish_frame_timer;
/* framebuffer mmap details */
size_t buffer_length;
void *fb;
/* pixman details. */
pixman_image_t *hw_surface;
};
static const char default_seat[] = "seat0";
static inline struct fbdev_head *
to_fbdev_head(struct weston_head *base)
{
return container_of(base, struct fbdev_head, base);
}
static inline struct fbdev_output *
to_fbdev_output(struct weston_output *base)
{
return container_of(base, struct fbdev_output, base);
}
static inline struct fbdev_backend *
to_fbdev_backend(struct weston_compositor *base)
{
return container_of(base->backend, struct fbdev_backend, base);
}
static struct fbdev_head *
fbdev_output_get_head(struct fbdev_output *output)
{
if (wl_list_length(&output->base.head_list) != 1)
return NULL;
return container_of(output->base.head_list.next,
struct fbdev_head, base.output_link);
}
static void
fbdev_output_start_repaint_loop(struct weston_output *output)
{
struct timespec ts;
weston_compositor_read_presentation_clock(output->compositor, &ts);
weston_output_finish_frame(output, &ts, WP_PRESENTATION_FEEDBACK_INVALID);
}
static int
fbdev_output_repaint(struct weston_output *base, pixman_region32_t *damage,
void *repaint_data)
{
struct fbdev_output *output = to_fbdev_output(base);
struct weston_compositor *ec = output->base.compositor;
/* Repaint the damaged region onto the back buffer. */
pixman_renderer_output_set_buffer(base, output->hw_surface);
ec->renderer->repaint_output(base, damage);
/* Update the damage region. */
pixman_region32_subtract(&ec->primary_plane.damage,
&ec->primary_plane.damage, damage);
/* Schedule the end of the frame. We do not sync this to the frame
* buffer clock because users who want that should be using the DRM
* compositor. FBIO_WAITFORVSYNC blocks and FB_ACTIVATE_VBL requires
* panning, which is broken in most kernel drivers.
*
* Finish the frame synchronised to the specified refresh rate. The
* refresh rate is given in mHz and the interval in ms. */
wl_event_source_timer_update(output->finish_frame_timer,
1000000 / output->mode.refresh);
return 0;
}
static int
finish_frame_handler(void *data)
{
struct fbdev_output *output = data;
struct timespec ts;
weston_compositor_read_presentation_clock(output->base.compositor, &ts);
weston_output_finish_frame(&output->base, &ts, 0);
return 1;
}
static pixman_format_code_t
calculate_pixman_format(struct fb_var_screeninfo *vinfo,
struct fb_fix_screeninfo *finfo)
{
/* Calculate the pixman format supported by the frame buffer from the
* buffer's metadata. Return 0 if no known pixman format is supported
* (since this has depth 0 it's guaranteed to not conflict with any
* actual pixman format).
*
* Documentation on the vinfo and finfo structures:
* http://www.mjmwired.net/kernel/Documentation/fb/api.txt
*
* TODO: Try a bit harder to support other formats, including setting
* the preferred format in the hardware. */
int type;
weston_log("Calculating pixman format from:\n"
STAMP_SPACE " - type: %i (aux: %i)\n"
STAMP_SPACE " - visual: %i\n"
STAMP_SPACE " - bpp: %i (grayscale: %i)\n"
STAMP_SPACE " - red: offset: %i, length: %i, MSB: %i\n"
STAMP_SPACE " - green: offset: %i, length: %i, MSB: %i\n"
STAMP_SPACE " - blue: offset: %i, length: %i, MSB: %i\n"
STAMP_SPACE " - transp: offset: %i, length: %i, MSB: %i\n",
finfo->type, finfo->type_aux, finfo->visual,
vinfo->bits_per_pixel, vinfo->grayscale,
vinfo->red.offset, vinfo->red.length, vinfo->red.msb_right,
vinfo->green.offset, vinfo->green.length,
vinfo->green.msb_right,
vinfo->blue.offset, vinfo->blue.length,
vinfo->blue.msb_right,
vinfo->transp.offset, vinfo->transp.length,
vinfo->transp.msb_right);
/* We only handle packed formats at the moment. */
if (finfo->type != FB_TYPE_PACKED_PIXELS)
return 0;
/* We only handle true-colour frame buffers at the moment. */
switch(finfo->visual) {
case FB_VISUAL_TRUECOLOR:
case FB_VISUAL_DIRECTCOLOR:
if (vinfo->grayscale != 0)
return 0;
break;
default:
return 0;
}
/* We only support formats with MSBs on the left. */
if (vinfo->red.msb_right != 0 || vinfo->green.msb_right != 0 ||
vinfo->blue.msb_right != 0)
return 0;
/* Work out the format type from the offsets. We only support RGBA and
* ARGB at the moment. */
type = PIXMAN_TYPE_OTHER;
if ((vinfo->transp.offset >= vinfo->red.offset ||
vinfo->transp.length == 0) &&
vinfo->red.offset >= vinfo->green.offset &&
vinfo->green.offset >= vinfo->blue.offset)
type = PIXMAN_TYPE_ARGB;
else if (vinfo->red.offset >= vinfo->green.offset &&
vinfo->green.offset >= vinfo->blue.offset &&
vinfo->blue.offset >= vinfo->transp.offset)
type = PIXMAN_TYPE_RGBA;
if (type == PIXMAN_TYPE_OTHER)
return 0;
/* Build the format. */
return PIXMAN_FORMAT(vinfo->bits_per_pixel, type,
vinfo->transp.length,
vinfo->red.length,
vinfo->green.length,
vinfo->blue.length);
}
static int
calculate_refresh_rate(struct fb_var_screeninfo *vinfo)
{
uint64_t quot;
/* Calculate monitor refresh rate. Default is 60 Hz. Units are mHz. */
quot = (vinfo->upper_margin + vinfo->lower_margin + vinfo->yres);
quot *= (vinfo->left_margin + vinfo->right_margin + vinfo->xres);
quot *= vinfo->pixclock;
if (quot > 0) {
uint64_t refresh_rate;
refresh_rate = 1000000000000000LLU / quot;
if (refresh_rate > 200000)
refresh_rate = 200000; /* cap at 200 Hz */
if (refresh_rate >= 1000) /* at least 1 Hz */
return refresh_rate;
}
return 60 * 1000; /* default to 60 Hz */
}
static int
fbdev_query_screen_info(int fd, struct fbdev_screeninfo *info)
{
struct fb_var_screeninfo varinfo;
struct fb_fix_screeninfo fixinfo;
/* Probe the device for screen information. */
if (ioctl(fd, FBIOGET_FSCREENINFO, &fixinfo) < 0 ||
ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) < 0) {
return -1;
}
/* Store the pertinent data. */
info->x_resolution = varinfo.xres;
info->y_resolution = varinfo.yres;
info->width_mm = varinfo.width;
info->height_mm = varinfo.height;
info->bits_per_pixel = varinfo.bits_per_pixel;
info->buffer_length = fixinfo.smem_len;
info->line_length = fixinfo.line_length;
strncpy(info->id, fixinfo.id, sizeof(info->id));
info->id[sizeof(info->id)-1] = '\0';
info->pixel_format = calculate_pixman_format(&varinfo, &fixinfo);
info->refresh_rate = calculate_refresh_rate(&varinfo);
if (info->pixel_format == 0) {
weston_log("Frame buffer uses an unsupported format.\n");
return -1;
}
return 1;
}
static int
fbdev_set_screen_info(int fd, struct fbdev_screeninfo *info)
{
struct fb_var_screeninfo varinfo;
/* Grab the current screen information. */
if (ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) < 0) {
return -1;
}
/* Update the information. */
varinfo.xres = info->x_resolution;
varinfo.yres = info->y_resolution;
varinfo.width = info->width_mm;
varinfo.height = info->height_mm;
varinfo.bits_per_pixel = info->bits_per_pixel;
/* Try to set up an ARGB (x8r8g8b8) pixel format. */
varinfo.grayscale = 0;
varinfo.transp.offset = 24;
varinfo.transp.length = 0;
varinfo.transp.msb_right = 0;
varinfo.red.offset = 16;
varinfo.red.length = 8;
varinfo.red.msb_right = 0;
varinfo.green.offset = 8;
varinfo.green.length = 8;
varinfo.green.msb_right = 0;
varinfo.blue.offset = 0;
varinfo.blue.length = 8;
varinfo.blue.msb_right = 0;
/* Set the device's screen information. */
if (ioctl(fd, FBIOPUT_VSCREENINFO, &varinfo) < 0) {
return -1;
}
return 1;
}
/* Returns an FD for the frame buffer device. */
static int
fbdev_frame_buffer_open(const char *fb_dev,
struct fbdev_screeninfo *screen_info)
{
int fd = -1;
weston_log("Opening fbdev frame buffer.\n");
/* Open the frame buffer device. */
fd = open(fb_dev, O_RDWR | O_CLOEXEC);
if (fd < 0) {
weston_log("Failed to open frame buffer device ‘%s’: %s\n",
fb_dev, strerror(errno));
return -1;
}
/* Grab the screen info. */
if (fbdev_query_screen_info(fd, screen_info) < 0) {
weston_log("Failed to get frame buffer info: %s\n",
strerror(errno));
close(fd);
return -1;
}
/* Attempt to wake up the framebuffer device, needed for secondary
* framebuffer devices */
if (fbdev_set_screen_info(fd, screen_info) < 0) {
weston_log("Failed to set mode settings. "
"Attempting to open output anyway.\n");
}
return fd;
}
/* Closes the FD on success or failure. */
static int
fbdev_frame_buffer_map(struct fbdev_output *output, int fd)
{
struct fbdev_head *head;
int retval = -1;
head = fbdev_output_get_head(output);
weston_log("Mapping fbdev frame buffer.\n");
/* Map the frame buffer. Write-only mode, since we don't want to read
* anything back (because it's slow). */
output->buffer_length = head->fb_info.buffer_length;
output->fb = mmap(NULL, output->buffer_length,
PROT_WRITE, MAP_SHARED, fd, 0);
if (output->fb == MAP_FAILED) {
weston_log("Failed to mmap frame buffer: %s\n",
strerror(errno));
output->fb = NULL;
goto out_close;
}
/* Create a pixman image to wrap the memory mapped frame buffer. */
output->hw_surface =
pixman_image_create_bits(head->fb_info.pixel_format,
head->fb_info.x_resolution,
head->fb_info.y_resolution,
output->fb,
head->fb_info.line_length);
if (output->hw_surface == NULL) {
weston_log("Failed to create surface for frame buffer.\n");
goto out_unmap;
}
/* Success! */
retval = 0;
out_unmap:
if (retval != 0 && output->fb != NULL) {
munmap(output->fb, output->buffer_length);
output->fb = NULL;
}
out_close:
if (fd >= 0)
close(fd);
return retval;
}
static void
fbdev_frame_buffer_unmap(struct fbdev_output *output)
{
if (!output->fb) {
assert(!output->hw_surface);
return;
}
weston_log("Unmapping fbdev frame buffer.\n");
if (output->hw_surface)
pixman_image_unref(output->hw_surface);
output->hw_surface = NULL;
if (munmap(output->fb, output->buffer_length) < 0)
weston_log("Failed to munmap frame buffer: %s\n",
strerror(errno));
output->fb = NULL;
}
static int
fbdev_output_attach_head(struct weston_output *output_base,
struct weston_head *head_base)
{
struct fbdev_output *output = to_fbdev_output(output_base);
struct fbdev_head *head = to_fbdev_head(head_base);
/* Clones not supported. */
if (!wl_list_empty(&output->base.head_list))
return -1;
/* only one static mode in list */
output->mode.flags = WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
output->mode.width = head->fb_info.x_resolution;
output->mode.height = head->fb_info.y_resolution;
output->mode.refresh = head->fb_info.refresh_rate;
wl_list_init(&output->base.mode_list);
wl_list_insert(&output->base.mode_list, &output->mode.link);
output->base.current_mode = &output->mode;
return 0;
}
static void fbdev_output_destroy(struct weston_output *base);
static int
fbdev_output_enable(struct weston_output *base)
{
struct fbdev_output *output = to_fbdev_output(base);
struct fbdev_backend *backend = to_fbdev_backend(base->compositor);
struct fbdev_head *head;
int fb_fd;
struct wl_event_loop *loop;
head = fbdev_output_get_head(output);
/* Create the frame buffer. */
fb_fd = fbdev_frame_buffer_open(head->device, &head->fb_info);
if (fb_fd < 0) {
weston_log("Creating frame buffer failed.\n");
return -1;
}
if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
weston_log("Mapping frame buffer failed.\n");
return -1;
}
output->base.start_repaint_loop = fbdev_output_start_repaint_loop;
output->base.repaint = fbdev_output_repaint;
if (pixman_renderer_output_create(&output->base,
PIXMAN_RENDERER_OUTPUT_USE_SHADOW) < 0)
goto out_hw_surface;
loop = wl_display_get_event_loop(backend->compositor->wl_display);
output->finish_frame_timer =
wl_event_loop_add_timer(loop, finish_frame_handler, output);
weston_log("fbdev output %d×%d px\n",
output->mode.width, output->mode.height);
weston_log_continue(STAMP_SPACE "guessing %d Hz and 96 dpi\n",
output->mode.refresh / 1000);
return 0;
out_hw_surface:
fbdev_frame_buffer_unmap(output);
return -1;
}
static int
fbdev_output_disable(struct weston_output *base)
{
struct fbdev_output *output = to_fbdev_output(base);
if (!base->enabled)
return 0;
wl_event_source_remove(output->finish_frame_timer);
output->finish_frame_timer = NULL;
pixman_renderer_output_destroy(&output->base);
fbdev_frame_buffer_unmap(output);
return 0;
}
static struct fbdev_head *
fbdev_head_create(struct fbdev_backend *backend, const char *device)
{
struct fbdev_head *head;
int fb_fd;
head = zalloc(sizeof *head);
if (!head)
return NULL;
head->device = strdup(device);
/* Create the frame buffer. */
fb_fd = fbdev_frame_buffer_open(head->device, &head->fb_info);
if (fb_fd < 0) {
weston_log("Creating frame buffer head failed.\n");
goto out_free;
}
close(fb_fd);
weston_head_init(&head->base, "fbdev");
weston_head_set_connection_status(&head->base, true);
weston_head_set_monitor_strings(&head->base, "unknown",
head->fb_info.id, NULL);
weston_head_set_subpixel(&head->base, WL_OUTPUT_SUBPIXEL_UNKNOWN);
weston_head_set_physical_size(&head->base, head->fb_info.width_mm,
head->fb_info.height_mm);
weston_compositor_add_head(backend->compositor, &head->base);
weston_log("Created head '%s' for device %s (%s)\n",
head->base.name, head->device, head->base.model);
return head;
out_free:
free(head->device);
free(head);
return NULL;
}
static void
fbdev_head_destroy(struct fbdev_head *head)
{
weston_head_release(&head->base);
free(head->device);
free(head);
}
static struct weston_output *
fbdev_output_create(struct weston_compositor *compositor,
const char *name)
{
struct fbdev_output *output;
weston_log("Creating fbdev output.\n");
output = zalloc(sizeof *output);
if (output == NULL)
return NULL;
output->backend = to_fbdev_backend(compositor);
weston_output_init(&output->base, compositor, name);
output->base.destroy = fbdev_output_destroy;
output->base.disable = fbdev_output_disable;
output->base.enable = fbdev_output_enable;
output->base.attach_head = fbdev_output_attach_head;
weston_compositor_add_pending_output(&output->base, compositor);
return &output->base;
}
static void
fbdev_output_destroy(struct weston_output *base)
{
struct fbdev_output *output = to_fbdev_output(base);
weston_log("Destroying fbdev output.\n");
fbdev_output_disable(base);
/* Remove the output. */
weston_output_release(&output->base);
free(output);
}
/* strcmp()-style return values. */
static int
compare_screen_info (const struct fbdev_screeninfo *a,
const struct fbdev_screeninfo *b)
{
if (a->x_resolution == b->x_resolution &&
a->y_resolution == b->y_resolution &&
a->width_mm == b->width_mm &&
a->height_mm == b->height_mm &&
a->bits_per_pixel == b->bits_per_pixel &&
a->pixel_format == b->pixel_format &&
a->refresh_rate == b->refresh_rate)
return 0;
return 1;
}
static int
fbdev_output_reenable(struct fbdev_backend *backend,
struct weston_output *base)
{
struct fbdev_output *output = to_fbdev_output(base);
struct fbdev_head *head;
struct fbdev_screeninfo new_screen_info;
int fb_fd;
head = fbdev_output_get_head(output);
weston_log("Re-enabling fbdev output.\n");
assert(output->base.enabled);
/* Create the frame buffer. */
fb_fd = fbdev_frame_buffer_open(head->device, &new_screen_info);
if (fb_fd < 0) {
weston_log("Creating frame buffer failed.\n");
return -1;
}
/* Check whether the frame buffer details have changed since we were
* disabled. */
if (compare_screen_info(&head->fb_info, &new_screen_info) != 0) {
/* Perform a mode-set to restore the old mode. */
if (fbdev_set_screen_info(fb_fd, &head->fb_info) < 0) {
weston_log("Failed to restore mode settings. "
"Attempting to re-open output anyway.\n");
}
close(fb_fd);
/* Disable and enable the output so that resources depending on
* the frame buffer X/Y resolution (such as the shadow buffer)
* are re-initialised. */
fbdev_output_disable(&output->base);
return fbdev_output_enable(&output->base);
}
/* Map the device if it has the same details as before. */
if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
weston_log("Mapping frame buffer failed.\n");
return -1;
}
return 0;
}
static void
fbdev_backend_destroy(struct weston_compositor *base)
{
struct fbdev_backend *backend = to_fbdev_backend(base);
struct weston_head *head, *next;
udev_input_destroy(&backend->input);
/* Destroy the output. */
weston_compositor_shutdown(base);
wl_list_for_each_safe(head, next, &base->head_list, compositor_link)
fbdev_head_destroy(to_fbdev_head(head));
/* Chain up. */
weston_launcher_destroy(base->launcher);
udev_unref(backend->udev);
free(backend);
}
static void
session_notify(struct wl_listener *listener, void *data)
{
struct weston_compositor *compositor = data;
struct fbdev_backend *backend = to_fbdev_backend(compositor);
struct weston_output *output;
if (compositor->session_active) {
weston_log("entering VT\n");
compositor->state = backend->prev_state;
wl_list_for_each(output, &compositor->output_list, link) {
fbdev_output_reenable(backend, output);
}
weston_compositor_damage_all(compositor);
udev_input_enable(&backend->input);
} else {
weston_log("leaving VT\n");
udev_input_disable(&backend->input);
wl_list_for_each(output, &compositor->output_list, link) {
fbdev_frame_buffer_unmap(to_fbdev_output(output));
}
backend->prev_state = compositor->state;
weston_compositor_offscreen(compositor);
/* If we have a repaint scheduled (from the idle handler), make
* sure we cancel that so we don't try to pageflip when we're
* vt switched away. The OFFSCREEN state will prevent
* further attempts at repainting. When we switch
* back, we schedule a repaint, which will process
* pending frame callbacks. */
wl_list_for_each(output,
&compositor->output_list, link) {
output->repaint_needed = false;
}
}
}
static char *
find_framebuffer_device(struct fbdev_backend *b, const char *seat)
{
struct udev_enumerate *e;
struct udev_list_entry *entry;
const char *path, *device_seat, *id;
char *fb_device_path = NULL;
struct udev_device *device, *fb_device, *pci;
e = udev_enumerate_new(b->udev);
udev_enumerate_add_match_subsystem(e, "graphics");
udev_enumerate_add_match_sysname(e, "fb[0-9]*");
udev_enumerate_scan_devices(e);
fb_device = NULL;
udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
bool is_boot_vga = false;
path = udev_list_entry_get_name(entry);
device = udev_device_new_from_syspath(b->udev, path);
if (!device)
continue;
device_seat = udev_device_get_property_value(device, "ID_SEAT");
if (!device_seat)
device_seat = default_seat;
if (strcmp(device_seat, seat)) {
udev_device_unref(device);
continue;
}
pci = udev_device_get_parent_with_subsystem_devtype(device,
"pci", NULL);
if (pci) {
id = udev_device_get_sysattr_value(pci, "boot_vga");
if (id && !strcmp(id, "1"))
is_boot_vga = true;
}
/* If a framebuffer device was found, and this device isn't
* the boot-VGA device, don't use it. */
if (!is_boot_vga && fb_device) {
udev_device_unref(device);
continue;
}
/* There can only be one boot_vga device. Try to use it
* at all costs. */
if (is_boot_vga) {
if (fb_device)
udev_device_unref(fb_device);
fb_device = device;
break;
}
/* Per the (!is_boot_vga && fb_device) test above, only
* trump existing saved devices with boot-VGA devices, so if
* the test ends up here, this must be the first device seen. */
assert(!fb_device);
fb_device = device;
}
udev_enumerate_unref(e);
if (fb_device) {
fb_device_path = strdup(udev_device_get_devnode(fb_device));
udev_device_unref(fb_device);
}
return fb_device_path;
}
static struct fbdev_backend *
fbdev_backend_create(struct weston_compositor *compositor,
struct weston_fbdev_backend_config *param)
{
struct fbdev_backend *backend;
const char *seat_id = default_seat;
const char *session_seat;
session_seat = getenv("XDG_SEAT");
if (session_seat)
seat_id = session_seat;
if (param->seat_id)
seat_id = param->seat_id;
weston_log("initializing fbdev backend\n");
backend = zalloc(sizeof *backend);
if (backend == NULL)
return NULL;
backend->compositor = compositor;
compositor->backend = &backend->base;
if (weston_compositor_set_presentation_clock_software(
compositor) < 0)
goto out_compositor;
backend->udev = udev_new();
if (backend->udev == NULL) {
weston_log("Failed to initialize udev context.\n");
goto out_compositor;
}
if (!param->device)
param->device = find_framebuffer_device(backend, seat_id);
if (!param->device) {
weston_log("fatal: no framebuffer devices detected.\n");
goto out_udev;
}
/* Set up the TTY. */
backend->session_listener.notify = session_notify;
wl_signal_add(&compositor->session_signal,
&backend->session_listener);
compositor->launcher =
weston_launcher_connect(compositor, param->tty, seat_id, false);
if (!compositor->launcher) {
weston_log("fatal: fbdev backend should be run using "
"weston-launch binary, or your system should "
"provide the logind D-Bus API.\n");
goto out_udev;
}
backend->base.destroy = fbdev_backend_destroy;
backend->base.create_output = fbdev_output_create;
backend->prev_state = WESTON_COMPOSITOR_ACTIVE;
weston_setup_vt_switch_bindings(compositor);
if (pixman_renderer_init(compositor) < 0)
goto out_launcher;
if (!fbdev_head_create(backend, param->device))
goto out_launcher;
free(param->device);
udev_input_init(&backend->input, compositor, backend->udev,
seat_id, param->configure_device);
return backend;
out_launcher:
free(param->device);
weston_launcher_destroy(compositor->launcher);
out_udev:
udev_unref(backend->udev);
out_compositor:
weston_compositor_shutdown(compositor);
free(backend);
return NULL;
}
static void
config_init_to_defaults(struct weston_fbdev_backend_config *config)
{
config->tty = 0; /* default to current tty */
config->device = NULL;
config->seat_id = NULL;
}
WL_EXPORT int
weston_backend_init(struct weston_compositor *compositor,
struct weston_backend_config *config_base)
{
struct fbdev_backend *b;
struct weston_fbdev_backend_config config = {{ 0, }};
if (config_base == NULL ||
config_base->struct_version != WESTON_FBDEV_BACKEND_CONFIG_VERSION ||
config_base->struct_size > sizeof(struct weston_fbdev_backend_config)) {
weston_log("fbdev backend config structure is invalid\n");
return -1;
}
config_init_to_defaults(&config);
memcpy(&config, config_base, config_base->struct_size);
b = fbdev_backend_create(compositor, &config);
if (b == NULL)
return -1;
return 0;
}