415 lines
9.9 KiB
C
415 lines
9.9 KiB
C
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#include <minix/fb.h>
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#include <minix/chardriver.h>
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#include <minix/drivers.h>
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#include <minix/ds.h>
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#include <minix/sysutil.h>
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#include <minix/type.h>
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#include <minix/vm.h>
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#include <sys/ioc_fb.h>
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#include <assert.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <dev/videomode/videomode.h>
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#include <dev/videomode/edidvar.h>
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#include <dev/videomode/edidreg.h>
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#include "logos.h"
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#include "fb_edid.h"
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#include "fb.h"
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/*
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* Function prototypes for the fb driver.
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*/
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static int fb_open(devminor_t minor, int access, endpoint_t user_endpt);
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static int fb_close(devminor_t minor);
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static ssize_t fb_read(devminor_t minor, u64_t pos, endpoint_t ep,
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cp_grant_id_t gid, size_t size, int flags, cdev_id_t id);
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static ssize_t fb_write(devminor_t minor, u64_t pos, endpoint_t ep,
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cp_grant_id_t gid, size_t size, int flags, cdev_id_t id);
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static int fb_ioctl(devminor_t minor, unsigned long request, endpoint_t ep,
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cp_grant_id_t gid, int flags, endpoint_t user_ep, cdev_id_t id);
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static void paint_bootlogo(int minor);
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static void paint_restartlogo(int minor);
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static void paint_centered(int minor, char *data, int width, int height);
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static int do_get_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid);
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static int do_put_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid);
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static int do_get_fixscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid);
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static int do_pan_display(int minor, endpoint_t ep, cp_grant_id_t gid);
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static int keep_displaying_restarted(void);
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/* SEF functions and variables. */
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static void sef_local_startup(void);
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static int sef_cb_init(int type, sef_init_info_t *info);
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static int sef_cb_lu_state_save(int);
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static int lu_state_restore(void);
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/* Entry points to the fb driver. */
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static struct chardriver fb_tab =
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{
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.cdr_open = fb_open,
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.cdr_close = fb_close,
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.cdr_read = fb_read,
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.cdr_write = fb_write,
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.cdr_ioctl = fb_ioctl
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};
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/** Represents the /dev/fb device. */
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static int has_restarted = 0;
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static u64_t has_restarted_t1, has_restarted_t2;
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static int open_counter[FB_DEV_NR]; /* Open count */
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static int
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fb_open(devminor_t minor, int UNUSED(access), endpoint_t UNUSED(user_endpt))
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{
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int r;
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static int initialized = 0;
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static struct edid_info info;
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static struct edid_info *infop = NULL;
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if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
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if (!initialized) {
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r = fb_edid_read(minor, &info);
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infop = (r == 0) ? &info : NULL;
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}
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if (arch_fb_init(minor, infop) == OK) {
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open_counter[minor]++;
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if (!initialized) {
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if (has_restarted) {
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read_frclock_64(&has_restarted_t1);
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paint_restartlogo(minor);
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} else {
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paint_bootlogo(minor);
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}
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initialized = 1;
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}
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return OK;
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}
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return ENXIO;
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}
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static int
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fb_close(devminor_t minor)
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{
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if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
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assert(open_counter[minor] > 0);
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open_counter[minor]--;
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return OK;
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}
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static ssize_t
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fb_read(devminor_t minor, u64_t pos, endpoint_t ep, cp_grant_id_t gid,
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size_t size, int UNUSED(flags), cdev_id_t UNUSED(id))
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{
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struct device dev;
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int r;
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if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
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assert(open_counter[minor] > 0);
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arch_get_device(minor, &dev);
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if (size == 0 || pos >= dev.dv_size) return 0;
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if (pos + size > dev.dv_size)
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size = (size_t)(dev.dv_size - pos);
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r = sys_safecopyto(ep, gid, 0, (vir_bytes)(dev.dv_base + (size_t)pos),
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size);
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return (r != OK) ? r : size;
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}
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static int
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fb_ioctl(devminor_t minor, unsigned long request, endpoint_t ep,
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cp_grant_id_t gid, int UNUSED(flags), endpoint_t UNUSED(user_ep),
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cdev_id_t UNUSED(id))
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{
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/* Process I/O control requests */
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int r;
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if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
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switch(request) {
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case FBIOGET_VSCREENINFO:
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r = do_get_varscreeninfo(minor, ep, gid);
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return r;
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case FBIOPUT_VSCREENINFO:
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r = do_put_varscreeninfo(minor, ep, gid);
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return r;
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case FBIOGET_FSCREENINFO:
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r = do_get_fixscreeninfo(minor, ep, gid);
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return r;
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case FBIOPAN_DISPLAY:
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r = do_pan_display(minor, ep, gid);
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return r;
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}
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return ENOTTY;
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}
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static int
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do_get_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid)
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{
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int r;
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struct fb_var_screeninfo fbvs;
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if ((r = arch_get_varscreeninfo(minor, &fbvs)) == OK) {
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r = sys_safecopyto(ep, gid, 0, (vir_bytes) &fbvs, sizeof(fbvs));
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}
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return r;
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}
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static int
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do_put_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid)
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{
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int r;
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struct fb_var_screeninfo fbvs_copy;
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if (has_restarted && keep_displaying_restarted()) {
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return EAGAIN;
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}
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if ((r = sys_safecopyfrom(ep, gid, 0, (vir_bytes) &fbvs_copy,
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sizeof(fbvs_copy))) != OK) {
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return r;
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}
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return arch_put_varscreeninfo(minor, &fbvs_copy);
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}
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static int
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do_pan_display(int minor, endpoint_t ep, cp_grant_id_t gid)
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{
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int r;
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struct fb_var_screeninfo fbvs_copy;
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if (has_restarted && keep_displaying_restarted()) {
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return EAGAIN;
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}
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if ((r = sys_safecopyfrom(ep, gid, 0, (vir_bytes) &fbvs_copy,
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sizeof(fbvs_copy))) != OK) {
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return r;
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}
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return arch_pan_display(minor, &fbvs_copy);
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}
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static int
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do_get_fixscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid)
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{
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int r;
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struct fb_fix_screeninfo fbfs;
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if ((r = arch_get_fixscreeninfo(minor, &fbfs)) == OK) {
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r = sys_safecopyto(ep, gid, 0, (vir_bytes) &fbfs, sizeof(fbfs));
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}
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return r;
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}
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static ssize_t
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fb_write(devminor_t minor, u64_t pos, endpoint_t ep, cp_grant_id_t gid,
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size_t size, int UNUSED(flags), cdev_id_t UNUSED(id))
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{
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struct device dev;
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int r;
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if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
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assert(open_counter[minor] > 0);
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if (has_restarted && keep_displaying_restarted())
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return EAGAIN;
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arch_get_device(minor, &dev);
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if (size == 0 || pos >= dev.dv_size) return 0;
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if (pos + size > dev.dv_size)
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size = (size_t)(dev.dv_size - pos);
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r = sys_safecopyfrom(ep, gid, 0,
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(vir_bytes)(dev.dv_base + (size_t)pos), size);
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return (r != OK) ? r : size;
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}
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static int
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sef_cb_lu_state_save(int UNUSED(state)) {
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/* Save the state. */
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ds_publish_u32("open_counter", open_counter[0], DSF_OVERWRITE);
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return OK;
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}
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static int
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lu_state_restore() {
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/* Restore the state. */
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u32_t value;
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ds_retrieve_u32("open_counter", &value);
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ds_delete_u32("open_counter");
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open_counter[0] = (int) value;
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return OK;
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}
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static void
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sef_local_startup()
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{
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/* Register init callbacks. Use the same function for all event types */
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sef_setcb_init_fresh(sef_cb_init);
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sef_setcb_init_lu(sef_cb_init);
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sef_setcb_init_restart(sef_cb_init);
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/* Register live update callbacks */
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/* - Agree to update immediately when LU is requested in a valid state*/
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sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
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/* - Support live update starting from any standard state */
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sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
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/* - Register a custom routine to save the state. */
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sef_setcb_lu_state_save(sef_cb_lu_state_save);
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/* Let SEF perform startup. */
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sef_startup();
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}
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static int
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sef_cb_init(int type, sef_init_info_t *UNUSED(info))
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{
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/* Initialize the fb driver. */
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int do_announce_driver = TRUE;
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open_counter[0] = 0;
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switch(type) {
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case SEF_INIT_FRESH:
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printf("framebuffer fresh: pid %d\n", getpid());
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break;
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case SEF_INIT_LU:
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/* Restore the state. */
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lu_state_restore();
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do_announce_driver = FALSE;
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printf("framebuffer: I'm a new version!\n");
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break;
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case SEF_INIT_RESTART:
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printf("framebuffer restarted: pid %d\n", getpid());
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has_restarted = 1;
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break;
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}
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/* Announce we are up when necessary. */
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if (do_announce_driver) {
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chardriver_announce();
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}
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/* Initialization completed successfully. */
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return OK;
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}
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int
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main(int argc, char *argv[])
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{
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env_setargs(argc, argv);
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fb_edid_args_parse();
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sef_local_startup();
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chardriver_task(&fb_tab);
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return OK;
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}
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static int
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keep_displaying_restarted()
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{
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u64_t delta;
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u32_t micro_delta;
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read_frclock_64(&has_restarted_t2);
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delta = delta_frclock_64(has_restarted_t1, has_restarted_t2);
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micro_delta = frclock_64_to_micros(delta);
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#define DISPLAY_1SEC 1000000 /* 1 second in microseconds */
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if (micro_delta < DISPLAY_1SEC) {
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return 1;
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}
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has_restarted = 0;
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return 0;
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}
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static void
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paint_bootlogo(int minor)
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{
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paint_centered(minor, bootlogo_data, bootlogo_width, bootlogo_height);
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}
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static void
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paint_restartlogo(int minor)
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{
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paint_centered(minor, restartlogo_data, restartlogo_width,
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restartlogo_height);
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}
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static void
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paint_centered(int minor, char *data, int width, int height)
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{
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u8_t pixel[3];
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u32_t i, min_x, min_y, max_x, max_y, x_painted = 0, rows = 0;
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int r, bytespp;
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struct device dev;
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struct fb_var_screeninfo fbvs;
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/* Put display in a known state to simplify positioning code below */
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if ((r = arch_get_varscreeninfo(minor, &fbvs)) != OK) {
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printf("fb: unable to get screen info: %d\n", r);
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}
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fbvs.yoffset = 0;
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if ((r = arch_pan_display(minor, &fbvs)) != OK) {
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||
|
|
printf("fb: unable to pan display: %d\n", r);
|
||
|
|
}
|
||
|
|
|
||
|
|
arch_get_device(minor, &dev);
|
||
|
|
|
||
|
|
/* Paint on a white canvas */
|
||
|
|
bytespp = fbvs.bits_per_pixel / 8;
|
||
|
|
for (i = 0; i < fbvs.xres * fbvs.yres * bytespp; i+= bytespp)
|
||
|
|
*((u32_t *)((u32_t) dev.dv_base + i)) = 0x00FFFFFF;
|
||
|
|
|
||
|
|
/* First seek to start */
|
||
|
|
min_x = fbvs.xres / 2 - width / 2;
|
||
|
|
max_x = fbvs.xres / 2 + width / 2;
|
||
|
|
min_y = fbvs.yres / 2 - height / 2;
|
||
|
|
max_y = fbvs.yres / 2 + height / 2;
|
||
|
|
i = min_x * fbvs.xres + min_y;
|
||
|
|
|
||
|
|
/* Add the image data */
|
||
|
|
for (i = ((min_y * fbvs.xres) + min_x) * bytespp; rows < height;) {
|
||
|
|
GET_PIXEL(data, pixel);
|
||
|
|
|
||
|
|
((unsigned char *)((u32_t) dev.dv_base + i))[0] = pixel[2];
|
||
|
|
((unsigned char *)((u32_t) dev.dv_base + i))[1] = pixel[1];
|
||
|
|
((unsigned char *)((u32_t) dev.dv_base + i))[2] = pixel[0];
|
||
|
|
((unsigned char *)((u32_t) dev.dv_base + i))[3] = 0;
|
||
|
|
|
||
|
|
x_painted++;/* Keep tab of how many row pixels we've painted */
|
||
|
|
if (x_painted == width) {
|
||
|
|
/* We've reached the end of the row, carriage return
|
||
|
|
* and go to next line.
|
||
|
|
*/
|
||
|
|
x_painted = 0;
|
||
|
|
rows++;
|
||
|
|
i = (((min_y + rows) * fbvs.xres) + min_x) * 4;
|
||
|
|
} else {
|
||
|
|
i += 4;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|