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linuxdebug/drivers/usb/misc/sisusbvga/sisusb_con.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
* sisusb - usb kernel driver for SiS315(E) based USB2VGA dongles
*
* VGA text mode console part
*
* Copyright (C) 2005 by Thomas Winischhofer, Vienna, Austria
*
* If distributed as part of the Linux kernel, this code is licensed under the
* terms of the GPL v2.
*
* Otherwise, the following license terms apply:
*
* * Redistribution and use in source and binary forms, with or without
* * modification, are permitted provided that the following conditions
* * are met:
* * 1) Redistributions of source code must retain the above copyright
* * notice, this list of conditions and the following disclaimer.
* * 2) Redistributions in binary form must reproduce the above copyright
* * notice, this list of conditions and the following disclaimer in the
* * documentation and/or other materials provided with the distribution.
* * 3) The name of the author may not be used to endorse or promote products
* * derived from this software without specific psisusbr written permission.
* *
* * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESSED OR
* * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Author: Thomas Winischhofer <thomas@winischhofer.net>
*
* Portions based on vgacon.c which are
* Created 28 Sep 1997 by Geert Uytterhoeven
* Rewritten by Martin Mares <mj@ucw.cz>, July 1998
* based on code Copyright (C) 1991, 1992 Linus Torvalds
* 1995 Jay Estabrook
*
* A note on using in_atomic() in here: We can't handle console
* calls from non-schedulable context due to our USB-dependend
* nature. For now, this driver just ignores any calls if it
* detects this state.
*
*/
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/fs.h>
#include <linux/usb.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/kd.h>
#include <linux/init.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/spinlock.h>
#include <linux/kref.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include "sisusb.h"
#include "sisusb_init.h"
/* vc_data -> sisusb conversion table */
static struct sisusb_usb_data *mysisusbs[MAX_NR_CONSOLES];
/* Forward declaration */
static const struct consw sisusb_con;
static inline void
sisusbcon_memsetw(u16 *s, u16 c, unsigned int count)
{
memset16(s, c, count / 2);
}
static inline void
sisusb_initialize(struct sisusb_usb_data *sisusb)
{
/* Reset cursor and start address */
if (sisusb_setidxreg(sisusb, SISCR, 0x0c, 0x00))
return;
if (sisusb_setidxreg(sisusb, SISCR, 0x0d, 0x00))
return;
if (sisusb_setidxreg(sisusb, SISCR, 0x0e, 0x00))
return;
sisusb_setidxreg(sisusb, SISCR, 0x0f, 0x00);
}
static inline void
sisusbcon_set_start_address(struct sisusb_usb_data *sisusb, struct vc_data *c)
{
sisusb->cur_start_addr = (c->vc_visible_origin - sisusb->scrbuf) / 2;
sisusb_setidxreg(sisusb, SISCR, 0x0c, (sisusb->cur_start_addr >> 8));
sisusb_setidxreg(sisusb, SISCR, 0x0d, (sisusb->cur_start_addr & 0xff));
}
void
sisusb_set_cursor(struct sisusb_usb_data *sisusb, unsigned int location)
{
if (sisusb->sisusb_cursor_loc == location)
return;
sisusb->sisusb_cursor_loc = location;
/* Hardware bug: Text cursor appears twice or not at all
* at some positions. Work around it with the cursor skew
* bits.
*/
if ((location & 0x0007) == 0x0007) {
sisusb->bad_cursor_pos = 1;
location--;
if (sisusb_setidxregandor(sisusb, SISCR, 0x0b, 0x1f, 0x20))
return;
} else if (sisusb->bad_cursor_pos) {
if (sisusb_setidxregand(sisusb, SISCR, 0x0b, 0x1f))
return;
sisusb->bad_cursor_pos = 0;
}
if (sisusb_setidxreg(sisusb, SISCR, 0x0e, (location >> 8)))
return;
sisusb_setidxreg(sisusb, SISCR, 0x0f, (location & 0xff));
}
static inline struct sisusb_usb_data *
sisusb_get_sisusb(unsigned short console)
{
return mysisusbs[console];
}
static inline int
sisusb_sisusb_valid(struct sisusb_usb_data *sisusb)
{
if (!sisusb->present || !sisusb->ready || !sisusb->sisusb_dev)
return 0;
return 1;
}
static struct sisusb_usb_data *
sisusb_get_sisusb_lock_and_check(unsigned short console)
{
struct sisusb_usb_data *sisusb;
/* We can't handle console calls in non-schedulable
* context due to our locks and the USB transport.
* So we simply ignore them. This should only affect
* some calls to printk.
*/
if (in_atomic())
return NULL;
sisusb = sisusb_get_sisusb(console);
if (!sisusb)
return NULL;
mutex_lock(&sisusb->lock);
if (!sisusb_sisusb_valid(sisusb) ||
!sisusb->havethisconsole[console]) {
mutex_unlock(&sisusb->lock);
return NULL;
}
return sisusb;
}
static int
sisusb_is_inactive(struct vc_data *c, struct sisusb_usb_data *sisusb)
{
if (sisusb->is_gfx ||
sisusb->textmodedestroyed ||
c->vc_mode != KD_TEXT)
return 1;
return 0;
}
/* con_startup console interface routine */
static const char *
sisusbcon_startup(void)
{
return "SISUSBCON";
}
/* con_init console interface routine */
static void
sisusbcon_init(struct vc_data *c, int init)
{
struct sisusb_usb_data *sisusb;
int cols, rows;
/* This is called by do_take_over_console(),
* ie by us/under our control. It is
* only called after text mode and fonts
* are set up/restored.
*/
sisusb = sisusb_get_sisusb(c->vc_num);
if (!sisusb)
return;
mutex_lock(&sisusb->lock);
if (!sisusb_sisusb_valid(sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
c->vc_can_do_color = 1;
c->vc_complement_mask = 0x7700;
c->vc_hi_font_mask = sisusb->current_font_512 ? 0x0800 : 0;
sisusb->haveconsole = 1;
sisusb->havethisconsole[c->vc_num] = 1;
/* We only support 640x400 */
c->vc_scan_lines = 400;
c->vc_font.height = sisusb->current_font_height;
/* We only support width = 8 */
cols = 80;
rows = c->vc_scan_lines / c->vc_font.height;
/* Increment usage count for our sisusb.
* Doing so saves us from upping/downing
* the disconnect semaphore; we can't
* lose our sisusb until this is undone
* in con_deinit. For all other console
* interface functions, it suffices to
* use sisusb->lock and do a quick check
* of sisusb for device disconnection.
*/
kref_get(&sisusb->kref);
if (!*c->uni_pagedict_loc)
con_set_default_unimap(c);
mutex_unlock(&sisusb->lock);
if (init) {
c->vc_cols = cols;
c->vc_rows = rows;
} else
vc_resize(c, cols, rows);
}
/* con_deinit console interface routine */
static void
sisusbcon_deinit(struct vc_data *c)
{
struct sisusb_usb_data *sisusb;
int i;
/* This is called by do_take_over_console()
* and others, ie not under our control.
*/
sisusb = sisusb_get_sisusb(c->vc_num);
if (!sisusb)
return;
mutex_lock(&sisusb->lock);
/* Clear ourselves in mysisusbs */
mysisusbs[c->vc_num] = NULL;
sisusb->havethisconsole[c->vc_num] = 0;
/* Free our font buffer if all consoles are gone */
if (sisusb->font_backup) {
for(i = 0; i < MAX_NR_CONSOLES; i++) {
if (sisusb->havethisconsole[c->vc_num])
break;
}
if (i == MAX_NR_CONSOLES) {
vfree(sisusb->font_backup);
sisusb->font_backup = NULL;
}
}
mutex_unlock(&sisusb->lock);
/* decrement the usage count on our sisusb */
kref_put(&sisusb->kref, sisusb_delete);
}
/* interface routine */
static u8
sisusbcon_build_attr(struct vc_data *c, u8 color, enum vc_intensity intensity,
bool blink, bool underline, bool reverse,
bool unused)
{
u8 attr = color;
if (underline)
attr = (attr & 0xf0) | c->vc_ulcolor;
else if (intensity == VCI_HALF_BRIGHT)
attr = (attr & 0xf0) | c->vc_halfcolor;
if (reverse)
attr = ((attr) & 0x88) |
((((attr) >> 4) |
((attr) << 4)) & 0x77);
if (blink)
attr ^= 0x80;
if (intensity == VCI_BOLD)
attr ^= 0x08;
return attr;
}
/* Interface routine */
static void
sisusbcon_invert_region(struct vc_data *vc, u16 *p, int count)
{
/* Invert a region. This is called with a pointer
* to the console's internal screen buffer. So we
* simply do the inversion there and rely on
* a call to putc(s) to update the real screen.
*/
while (count--) {
u16 a = *p;
*p++ = ((a) & 0x88ff) |
(((a) & 0x7000) >> 4) |
(((a) & 0x0700) << 4);
}
}
static inline void *sisusb_vaddr(const struct sisusb_usb_data *sisusb,
const struct vc_data *c, unsigned int x, unsigned int y)
{
return (u16 *)c->vc_origin + y * sisusb->sisusb_num_columns + x;
}
static inline unsigned long sisusb_haddr(const struct sisusb_usb_data *sisusb,
const struct vc_data *c, unsigned int x, unsigned int y)
{
unsigned long offset = c->vc_origin - sisusb->scrbuf;
/* 2 bytes per each character */
offset += 2 * (y * sisusb->sisusb_num_columns + x);
return sisusb->vrambase + offset;
}
/* Interface routine */
static void
sisusbcon_putc(struct vc_data *c, int ch, int y, int x)
{
struct sisusb_usb_data *sisusb;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, x, y),
sisusb_haddr(sisusb, c, x, y), 2);
mutex_unlock(&sisusb->lock);
}
/* Interface routine */
static void
sisusbcon_putcs(struct vc_data *c, const unsigned short *s,
int count, int y, int x)
{
struct sisusb_usb_data *sisusb;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
/* Need to put the characters into the buffer ourselves,
* because the vt does this AFTER calling us.
*/
memcpy(sisusb_vaddr(sisusb, c, x, y), s, count * 2);
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, x, y),
sisusb_haddr(sisusb, c, x, y), count * 2);
mutex_unlock(&sisusb->lock);
}
/* Interface routine */
static void
sisusbcon_clear(struct vc_data *c, int y, int x, int height, int width)
{
struct sisusb_usb_data *sisusb;
u16 eattr = c->vc_video_erase_char;
int i, length, cols;
u16 *dest;
if (width <= 0 || height <= 0)
return;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
/* Need to clear buffer ourselves, because the vt does
* this AFTER calling us.
*/
dest = sisusb_vaddr(sisusb, c, x, y);
cols = sisusb->sisusb_num_columns;
if (width > cols)
width = cols;
if (x == 0 && width >= c->vc_cols) {
sisusbcon_memsetw(dest, eattr, height * cols * 2);
} else {
for (i = height; i > 0; i--, dest += cols)
sisusbcon_memsetw(dest, eattr, width * 2);
}
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
length = ((height * cols) - x - (cols - width - x)) * 2;
sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, x, y),
sisusb_haddr(sisusb, c, x, y), length);
mutex_unlock(&sisusb->lock);
}
/* interface routine */
static int
sisusbcon_switch(struct vc_data *c)
{
struct sisusb_usb_data *sisusb;
int length;
/* Returnvalue 0 means we have fully restored screen,
* and vt doesn't need to call do_update_region().
* Returnvalue != 0 naturally means the opposite.
*/
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return 0;
/* sisusb->lock is down */
/* Don't write to screen if in gfx mode */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return 0;
}
/* That really should not happen. It would mean we are
* being called while the vc is using its private buffer
* as origin.
*/
if (c->vc_origin == (unsigned long)c->vc_screenbuf) {
mutex_unlock(&sisusb->lock);
dev_dbg(&sisusb->sisusb_dev->dev, "ASSERT ORIGIN != SCREENBUF!\n");
return 0;
}
/* Check that we don't copy too much */
length = min((int)c->vc_screenbuf_size,
(int)(sisusb->scrbuf + sisusb->scrbuf_size - c->vc_origin));
/* Restore the screen contents */
memcpy((u16 *)c->vc_origin, (u16 *)c->vc_screenbuf, length);
sisusb_copy_memory(sisusb, (u8 *)c->vc_origin,
sisusb_haddr(sisusb, c, 0, 0), length);
mutex_unlock(&sisusb->lock);
return 0;
}
/* interface routine */
static void
sisusbcon_save_screen(struct vc_data *c)
{
struct sisusb_usb_data *sisusb;
int length;
/* Save the current screen contents to vc's private
* buffer.
*/
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
/* Check that we don't copy too much */
length = min((int)c->vc_screenbuf_size,
(int)(sisusb->scrbuf + sisusb->scrbuf_size - c->vc_origin));
/* Save the screen contents to vc's private buffer */
memcpy((u16 *)c->vc_screenbuf, (u16 *)c->vc_origin, length);
mutex_unlock(&sisusb->lock);
}
/* interface routine */
static void
sisusbcon_set_palette(struct vc_data *c, const unsigned char *table)
{
struct sisusb_usb_data *sisusb;
int i, j;
/* Return value not used by vt */
if (!con_is_visible(c))
return;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
for (i = j = 0; i < 16; i++) {
if (sisusb_setreg(sisusb, SISCOLIDX, table[i]))
break;
if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
break;
if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
break;
if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
break;
}
mutex_unlock(&sisusb->lock);
}
/* interface routine */
static int
sisusbcon_blank(struct vc_data *c, int blank, int mode_switch)
{
struct sisusb_usb_data *sisusb;
u8 sr1, cr17, pmreg, cr63;
int ret = 0;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return 0;
/* sisusb->lock is down */
if (mode_switch)
sisusb->is_gfx = blank ? 1 : 0;
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return 0;
}
switch (blank) {
case 1: /* Normal blanking: Clear screen */
case -1:
sisusbcon_memsetw((u16 *)c->vc_origin,
c->vc_video_erase_char,
c->vc_screenbuf_size);
sisusb_copy_memory(sisusb, (u8 *)c->vc_origin,
sisusb_haddr(sisusb, c, 0, 0),
c->vc_screenbuf_size);
sisusb->con_blanked = 1;
ret = 1;
break;
default: /* VESA blanking */
switch (blank) {
case 0: /* Unblank */
sr1 = 0x00;
cr17 = 0x80;
pmreg = 0x00;
cr63 = 0x00;
ret = 1;
sisusb->con_blanked = 0;
break;
case VESA_VSYNC_SUSPEND + 1:
sr1 = 0x20;
cr17 = 0x80;
pmreg = 0x80;
cr63 = 0x40;
break;
case VESA_HSYNC_SUSPEND + 1:
sr1 = 0x20;
cr17 = 0x80;
pmreg = 0x40;
cr63 = 0x40;
break;
case VESA_POWERDOWN + 1:
sr1 = 0x20;
cr17 = 0x00;
pmreg = 0xc0;
cr63 = 0x40;
break;
default:
mutex_unlock(&sisusb->lock);
return -EINVAL;
}
sisusb_setidxregandor(sisusb, SISSR, 0x01, ~0x20, sr1);
sisusb_setidxregandor(sisusb, SISCR, 0x17, 0x7f, cr17);
sisusb_setidxregandor(sisusb, SISSR, 0x1f, 0x3f, pmreg);
sisusb_setidxregandor(sisusb, SISCR, 0x63, 0xbf, cr63);
}
mutex_unlock(&sisusb->lock);
return ret;
}
/* interface routine */
static void
sisusbcon_scrolldelta(struct vc_data *c, int lines)
{
struct sisusb_usb_data *sisusb;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
vc_scrolldelta_helper(c, lines, sisusb->con_rolled_over,
(void *)sisusb->scrbuf, sisusb->scrbuf_size);
sisusbcon_set_start_address(sisusb, c);
mutex_unlock(&sisusb->lock);
}
/* Interface routine */
static void
sisusbcon_cursor(struct vc_data *c, int mode)
{
struct sisusb_usb_data *sisusb;
int from, to, baseline;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return;
}
if (c->vc_origin != c->vc_visible_origin) {
c->vc_visible_origin = c->vc_origin;
sisusbcon_set_start_address(sisusb, c);
}
if (mode == CM_ERASE) {
sisusb_setidxregor(sisusb, SISCR, 0x0a, 0x20);
sisusb->sisusb_cursor_size_to = -1;
mutex_unlock(&sisusb->lock);
return;
}
sisusb_set_cursor(sisusb, (c->vc_pos - sisusb->scrbuf) / 2);
baseline = c->vc_font.height - (c->vc_font.height < 10 ? 1 : 2);
switch (CUR_SIZE(c->vc_cursor_type)) {
case CUR_BLOCK: from = 1;
to = c->vc_font.height;
break;
case CUR_TWO_THIRDS: from = c->vc_font.height / 3;
to = baseline;
break;
case CUR_LOWER_HALF: from = c->vc_font.height / 2;
to = baseline;
break;
case CUR_LOWER_THIRD: from = (c->vc_font.height * 2) / 3;
to = baseline;
break;
case CUR_NONE: from = 31;
to = 30;
break;
default:
case CUR_UNDERLINE: from = baseline - 1;
to = baseline;
break;
}
if (sisusb->sisusb_cursor_size_from != from ||
sisusb->sisusb_cursor_size_to != to) {
sisusb_setidxreg(sisusb, SISCR, 0x0a, from);
sisusb_setidxregandor(sisusb, SISCR, 0x0b, 0xe0, to);
sisusb->sisusb_cursor_size_from = from;
sisusb->sisusb_cursor_size_to = to;
}
mutex_unlock(&sisusb->lock);
}
static bool
sisusbcon_scroll_area(struct vc_data *c, struct sisusb_usb_data *sisusb,
unsigned int t, unsigned int b, enum con_scroll dir,
unsigned int lines)
{
int cols = sisusb->sisusb_num_columns;
int length = ((b - t) * cols) * 2;
u16 eattr = c->vc_video_erase_char;
/* sisusb->lock is down */
/* Scroll an area which does not match the
* visible screen's dimensions. This needs
* to be done separately, as it does not
* use hardware panning.
*/
switch (dir) {
case SM_UP:
memmove(sisusb_vaddr(sisusb, c, 0, t),
sisusb_vaddr(sisusb, c, 0, t + lines),
(b - t - lines) * cols * 2);
sisusbcon_memsetw(sisusb_vaddr(sisusb, c, 0, b - lines),
eattr, lines * cols * 2);
break;
case SM_DOWN:
memmove(sisusb_vaddr(sisusb, c, 0, t + lines),
sisusb_vaddr(sisusb, c, 0, t),
(b - t - lines) * cols * 2);
sisusbcon_memsetw(sisusb_vaddr(sisusb, c, 0, t), eattr,
lines * cols * 2);
break;
}
sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, 0, t),
sisusb_haddr(sisusb, c, 0, t), length);
mutex_unlock(&sisusb->lock);
return true;
}
/* Interface routine */
static bool
sisusbcon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
enum con_scroll dir, unsigned int lines)
{
struct sisusb_usb_data *sisusb;
u16 eattr = c->vc_video_erase_char;
int copyall = 0;
unsigned long oldorigin;
unsigned int delta = lines * c->vc_size_row;
/* Returning != 0 means we have done the scrolling successfully.
* Returning 0 makes vt do the scrolling on its own.
* Note that con_scroll is only called if the console is
* visible. In that case, the origin should be our buffer,
* not the vt's private one.
*/
if (!lines)
return true;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return false;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb)) {
mutex_unlock(&sisusb->lock);
return false;
}
/* Special case */
if (t || b != c->vc_rows)
return sisusbcon_scroll_area(c, sisusb, t, b, dir, lines);
if (c->vc_origin != c->vc_visible_origin) {
c->vc_visible_origin = c->vc_origin;
sisusbcon_set_start_address(sisusb, c);
}
/* limit amount to maximum realistic size */
if (lines > c->vc_rows)
lines = c->vc_rows;
oldorigin = c->vc_origin;
switch (dir) {
case SM_UP:
if (c->vc_scr_end + delta >=
sisusb->scrbuf + sisusb->scrbuf_size) {
memcpy((u16 *)sisusb->scrbuf,
(u16 *)(oldorigin + delta),
c->vc_screenbuf_size - delta);
c->vc_origin = sisusb->scrbuf;
sisusb->con_rolled_over = oldorigin - sisusb->scrbuf;
copyall = 1;
} else
c->vc_origin += delta;
sisusbcon_memsetw(
(u16 *)(c->vc_origin + c->vc_screenbuf_size - delta),
eattr, delta);
break;
case SM_DOWN:
if (oldorigin - delta < sisusb->scrbuf) {
memmove((void *)sisusb->scrbuf + sisusb->scrbuf_size -
c->vc_screenbuf_size + delta,
(u16 *)oldorigin,
c->vc_screenbuf_size - delta);
c->vc_origin = sisusb->scrbuf +
sisusb->scrbuf_size -
c->vc_screenbuf_size;
sisusb->con_rolled_over = 0;
copyall = 1;
} else
c->vc_origin -= delta;
c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
scr_memsetw((u16 *)(c->vc_origin), eattr, delta);
break;
}
if (copyall)
sisusb_copy_memory(sisusb,
(u8 *)c->vc_origin,
sisusb_haddr(sisusb, c, 0, 0),
c->vc_screenbuf_size);
else if (dir == SM_UP)
sisusb_copy_memory(sisusb,
(u8 *)c->vc_origin + c->vc_screenbuf_size - delta,
sisusb_haddr(sisusb, c, 0, 0) +
c->vc_screenbuf_size - delta,
delta);
else
sisusb_copy_memory(sisusb,
(u8 *)c->vc_origin,
sisusb_haddr(sisusb, c, 0, 0),
delta);
c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
c->vc_visible_origin = c->vc_origin;
sisusbcon_set_start_address(sisusb, c);
c->vc_pos = c->vc_pos - oldorigin + c->vc_origin;
mutex_unlock(&sisusb->lock);
return true;
}
/* Interface routine */
static int
sisusbcon_set_origin(struct vc_data *c)
{
struct sisusb_usb_data *sisusb;
/* Returning != 0 means we were successful.
* Returning 0 will vt make to use its own
* screenbuffer as the origin.
*/
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return 0;
/* sisusb->lock is down */
if (sisusb_is_inactive(c, sisusb) || sisusb->con_blanked) {
mutex_unlock(&sisusb->lock);
return 0;
}
c->vc_origin = c->vc_visible_origin = sisusb->scrbuf;
sisusbcon_set_start_address(sisusb, c);
sisusb->con_rolled_over = 0;
mutex_unlock(&sisusb->lock);
return true;
}
/* Interface routine */
static int
sisusbcon_resize(struct vc_data *c, unsigned int newcols, unsigned int newrows,
unsigned int user)
{
struct sisusb_usb_data *sisusb;
int fh;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return -ENODEV;
fh = sisusb->current_font_height;
mutex_unlock(&sisusb->lock);
/* We are quite unflexible as regards resizing. The vt code
* handles sizes where the line length isn't equal the pitch
* quite badly. As regards the rows, our panning tricks only
* work well if the number of rows equals the visible number
* of rows.
*/
if (newcols != 80 || c->vc_scan_lines / fh != newrows)
return -EINVAL;
return 0;
}
int
sisusbcon_do_font_op(struct sisusb_usb_data *sisusb, int set, int slot,
u8 *arg, int cmapsz, int ch512, int dorecalc,
struct vc_data *c, int fh, int uplock)
{
int font_select = 0x00, i, err = 0;
u32 offset = 0;
u8 dummy;
/* sisusb->lock is down */
/*
* The default font is kept in slot 0.
* A user font is loaded in slot 2 (256 ch)
* or 2+3 (512 ch).
*/
if ((slot != 0 && slot != 2) || !fh) {
if (uplock)
mutex_unlock(&sisusb->lock);
return -EINVAL;
}
if (set)
sisusb->font_slot = slot;
/* Default font is always 256 */
if (slot == 0)
ch512 = 0;
else
offset = 4 * cmapsz;
font_select = (slot == 0) ? 0x00 : (ch512 ? 0x0e : 0x0a);
err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x01); /* Reset */
err |= sisusb_setidxreg(sisusb, SISSR, 0x02, 0x04); /* Write to plane 2 */
err |= sisusb_setidxreg(sisusb, SISSR, 0x04, 0x07); /* Memory mode a0-bf */
err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x03); /* Reset */
if (err)
goto font_op_error;
err |= sisusb_setidxreg(sisusb, SISGR, 0x04, 0x03); /* Select plane read 2 */
err |= sisusb_setidxreg(sisusb, SISGR, 0x05, 0x00); /* Disable odd/even */
err |= sisusb_setidxreg(sisusb, SISGR, 0x06, 0x00); /* Address range a0-bf */
if (err)
goto font_op_error;
if (arg) {
if (set)
for (i = 0; i < cmapsz; i++) {
err |= sisusb_writeb(sisusb,
sisusb->vrambase + offset + i,
arg[i]);
if (err)
break;
}
else
for (i = 0; i < cmapsz; i++) {
err |= sisusb_readb(sisusb,
sisusb->vrambase + offset + i,
&arg[i]);
if (err)
break;
}
/*
* In 512-character mode, the character map is not contiguous if
* we want to remain EGA compatible -- which we do
*/
if (ch512) {
if (set)
for (i = 0; i < cmapsz; i++) {
err |= sisusb_writeb(sisusb,
sisusb->vrambase + offset +
(2 * cmapsz) + i,
arg[cmapsz + i]);
if (err)
break;
}
else
for (i = 0; i < cmapsz; i++) {
err |= sisusb_readb(sisusb,
sisusb->vrambase + offset +
(2 * cmapsz) + i,
&arg[cmapsz + i]);
if (err)
break;
}
}
}
if (err)
goto font_op_error;
err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x01); /* Reset */
err |= sisusb_setidxreg(sisusb, SISSR, 0x02, 0x03); /* Write to planes 0+1 */
err |= sisusb_setidxreg(sisusb, SISSR, 0x04, 0x03); /* Memory mode a0-bf */
if (set)
sisusb_setidxreg(sisusb, SISSR, 0x03, font_select);
err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x03); /* Reset end */
if (err)
goto font_op_error;
err |= sisusb_setidxreg(sisusb, SISGR, 0x04, 0x00); /* Select plane read 0 */
err |= sisusb_setidxreg(sisusb, SISGR, 0x05, 0x10); /* Enable odd/even */
err |= sisusb_setidxreg(sisusb, SISGR, 0x06, 0x06); /* Address range b8-bf */
if (err)
goto font_op_error;
if ((set) && (ch512 != sisusb->current_font_512)) {
/* Font is shared among all our consoles.
* And so is the hi_font_mask.
*/
for (i = 0; i < MAX_NR_CONSOLES; i++) {
struct vc_data *d = vc_cons[i].d;
if (d && d->vc_sw == &sisusb_con)
d->vc_hi_font_mask = ch512 ? 0x0800 : 0;
}
sisusb->current_font_512 = ch512;
/* color plane enable register:
256-char: enable intensity bit
512-char: disable intensity bit */
sisusb_getreg(sisusb, SISINPSTAT, &dummy);
sisusb_setreg(sisusb, SISAR, 0x12);
sisusb_setreg(sisusb, SISAR, ch512 ? 0x07 : 0x0f);
sisusb_getreg(sisusb, SISINPSTAT, &dummy);
sisusb_setreg(sisusb, SISAR, 0x20);
sisusb_getreg(sisusb, SISINPSTAT, &dummy);
}
if (dorecalc) {
/*
* Adjust the screen to fit a font of a certain height
*/
unsigned char ovr, vde, fsr;
int rows = 0, maxscan = 0;
if (c) {
/* Number of video rows */
rows = c->vc_scan_lines / fh;
/* Scan lines to actually display-1 */
maxscan = rows * fh - 1;
/*printk(KERN_DEBUG "sisusb recalc rows %d maxscan %d fh %d sl %d\n",
rows, maxscan, fh, c->vc_scan_lines);*/
sisusb_getidxreg(sisusb, SISCR, 0x07, &ovr);
vde = maxscan & 0xff;
ovr = (ovr & 0xbd) |
((maxscan & 0x100) >> 7) |
((maxscan & 0x200) >> 3);
sisusb_setidxreg(sisusb, SISCR, 0x07, ovr);
sisusb_setidxreg(sisusb, SISCR, 0x12, vde);
}
sisusb_getidxreg(sisusb, SISCR, 0x09, &fsr);
fsr = (fsr & 0xe0) | (fh - 1);
sisusb_setidxreg(sisusb, SISCR, 0x09, fsr);
sisusb->current_font_height = fh;
sisusb->sisusb_cursor_size_from = -1;
sisusb->sisusb_cursor_size_to = -1;
}
if (uplock)
mutex_unlock(&sisusb->lock);
if (dorecalc && c) {
int rows = c->vc_scan_lines / fh;
/* Now adjust our consoles' size */
for (i = 0; i < MAX_NR_CONSOLES; i++) {
struct vc_data *vc = vc_cons[i].d;
if (vc && vc->vc_sw == &sisusb_con) {
if (con_is_visible(vc)) {
vc->vc_sw->con_cursor(vc, CM_DRAW);
}
vc->vc_font.height = fh;
vc_resize(vc, 0, rows);
}
}
}
return 0;
font_op_error:
if (uplock)
mutex_unlock(&sisusb->lock);
return -EIO;
}
/* Interface routine */
static int
sisusbcon_font_set(struct vc_data *c, struct console_font *font,
unsigned int flags)
{
struct sisusb_usb_data *sisusb;
unsigned charcount = font->charcount;
if (font->width != 8 || (charcount != 256 && charcount != 512))
return -EINVAL;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return -ENODEV;
/* sisusb->lock is down */
/* Save the user-provided font into a buffer. This
* is used for restoring text mode after quitting
* from X and for the con_getfont routine.
*/
if (sisusb->font_backup) {
if (sisusb->font_backup_size < charcount) {
vfree(sisusb->font_backup);
sisusb->font_backup = NULL;
}
}
if (!sisusb->font_backup)
sisusb->font_backup = vmalloc(array_size(charcount, 32));
if (sisusb->font_backup) {
memcpy(sisusb->font_backup, font->data, array_size(charcount, 32));
sisusb->font_backup_size = charcount;
sisusb->font_backup_height = font->height;
sisusb->font_backup_512 = (charcount == 512) ? 1 : 0;
}
/* do_font_op ups sisusb->lock */
return sisusbcon_do_font_op(sisusb, 1, 2, font->data,
8192, (charcount == 512),
(!(flags & KD_FONT_FLAG_DONT_RECALC)) ? 1 : 0,
c, font->height, 1);
}
/* Interface routine */
static int
sisusbcon_font_get(struct vc_data *c, struct console_font *font)
{
struct sisusb_usb_data *sisusb;
sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
if (!sisusb)
return -ENODEV;
/* sisusb->lock is down */
font->width = 8;
font->height = c->vc_font.height;
font->charcount = 256;
if (!font->data) {
mutex_unlock(&sisusb->lock);
return 0;
}
if (!sisusb->font_backup) {
mutex_unlock(&sisusb->lock);
return -ENODEV;
}
/* Copy 256 chars only, like vgacon */
memcpy(font->data, sisusb->font_backup, 256 * 32);
mutex_unlock(&sisusb->lock);
return 0;
}
/*
* The console `switch' structure for the sisusb console
*/
static const struct consw sisusb_con = {
.owner = THIS_MODULE,
.con_startup = sisusbcon_startup,
.con_init = sisusbcon_init,
.con_deinit = sisusbcon_deinit,
.con_clear = sisusbcon_clear,
.con_putc = sisusbcon_putc,
.con_putcs = sisusbcon_putcs,
.con_cursor = sisusbcon_cursor,
.con_scroll = sisusbcon_scroll,
.con_switch = sisusbcon_switch,
.con_blank = sisusbcon_blank,
.con_font_set = sisusbcon_font_set,
.con_font_get = sisusbcon_font_get,
.con_set_palette = sisusbcon_set_palette,
.con_scrolldelta = sisusbcon_scrolldelta,
.con_build_attr = sisusbcon_build_attr,
.con_invert_region = sisusbcon_invert_region,
.con_set_origin = sisusbcon_set_origin,
.con_save_screen = sisusbcon_save_screen,
.con_resize = sisusbcon_resize,
};
/* Our very own dummy console driver */
static const char *sisusbdummycon_startup(void)
{
return "SISUSBVGADUMMY";
}
static void sisusbdummycon_init(struct vc_data *vc, int init)
{
vc->vc_can_do_color = 1;
if (init) {
vc->vc_cols = 80;
vc->vc_rows = 25;
} else
vc_resize(vc, 80, 25);
}
static void sisusbdummycon_deinit(struct vc_data *vc) { }
static void sisusbdummycon_clear(struct vc_data *vc, int sy, int sx,
int height, int width) { }
static void sisusbdummycon_putc(struct vc_data *vc, int c, int ypos,
int xpos) { }
static void sisusbdummycon_putcs(struct vc_data *vc, const unsigned short *s,
int count, int ypos, int xpos) { }
static void sisusbdummycon_cursor(struct vc_data *vc, int mode) { }
static bool sisusbdummycon_scroll(struct vc_data *vc, unsigned int top,
unsigned int bottom, enum con_scroll dir,
unsigned int lines)
{
return false;
}
static int sisusbdummycon_switch(struct vc_data *vc)
{
return 0;
}
static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch)
{
return 0;
}
static const struct consw sisusb_dummy_con = {
.owner = THIS_MODULE,
.con_startup = sisusbdummycon_startup,
.con_init = sisusbdummycon_init,
.con_deinit = sisusbdummycon_deinit,
.con_clear = sisusbdummycon_clear,
.con_putc = sisusbdummycon_putc,
.con_putcs = sisusbdummycon_putcs,
.con_cursor = sisusbdummycon_cursor,
.con_scroll = sisusbdummycon_scroll,
.con_switch = sisusbdummycon_switch,
.con_blank = sisusbdummycon_blank,
};
int
sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
{
int i, ret;
mutex_lock(&sisusb->lock);
/* Erm.. that should not happen */
if (sisusb->haveconsole || !sisusb->SiS_Pr) {
mutex_unlock(&sisusb->lock);
return 1;
}
sisusb->con_first = first;
sisusb->con_last = last;
if (first > last ||
first > MAX_NR_CONSOLES ||
last > MAX_NR_CONSOLES) {
mutex_unlock(&sisusb->lock);
return 1;
}
/* If gfxcore not initialized or no consoles given, quit graciously */
if (!sisusb->gfxinit || first < 1 || last < 1) {
mutex_unlock(&sisusb->lock);
return 0;
}
sisusb->sisusb_cursor_loc = -1;
sisusb->sisusb_cursor_size_from = -1;
sisusb->sisusb_cursor_size_to = -1;
/* Set up text mode (and upload default font) */
if (sisusb_reset_text_mode(sisusb, 1)) {
mutex_unlock(&sisusb->lock);
dev_err(&sisusb->sisusb_dev->dev, "Failed to set up text mode\n");
return 1;
}
/* Initialize some gfx registers */
sisusb_initialize(sisusb);
for (i = first - 1; i <= last - 1; i++) {
/* Save sisusb for our interface routines */
mysisusbs[i] = sisusb;
}
/* Initial console setup */
sisusb->sisusb_num_columns = 80;
/* Use a 32K buffer (matches b8000-bffff area) */
sisusb->scrbuf_size = 32 * 1024;
/* Allocate screen buffer */
if (!(sisusb->scrbuf = (unsigned long)vmalloc(sisusb->scrbuf_size))) {
mutex_unlock(&sisusb->lock);
dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate screen buffer\n");
return 1;
}
mutex_unlock(&sisusb->lock);
/* Now grab the desired console(s) */
console_lock();
ret = do_take_over_console(&sisusb_con, first - 1, last - 1, 0);
console_unlock();
if (!ret)
sisusb->haveconsole = 1;
else {
for (i = first - 1; i <= last - 1; i++)
mysisusbs[i] = NULL;
}
return ret;
}
void
sisusb_console_exit(struct sisusb_usb_data *sisusb)
{
int i;
/* This is called if the device is disconnected
* and while disconnect and lock semaphores
* are up. This should be save because we
* can't lose our sisusb any other way but by
* disconnection (and hence, the disconnect
* sema is for protecting all other access
* functions from disconnection, not the
* other way round).
*/
/* Now what do we do in case of disconnection:
* One alternative would be to simply call
* give_up_console(). Nah, not a good idea.
* give_up_console() is obviously buggy as it
* only discards the consw pointer from the
* driver_map, but doesn't adapt vc->vc_sw
* of the affected consoles. Hence, the next
* call to any of the console functions will
* eventually take a trip to oops county.
* Also, give_up_console for some reason
* doesn't decrement our module refcount.
* Instead, we switch our consoles to a private
* dummy console. This, of course, keeps our
* refcount up as well, but it works perfectly.
*/
if (sisusb->haveconsole) {
for (i = 0; i < MAX_NR_CONSOLES; i++)
if (sisusb->havethisconsole[i]) {
console_lock();
do_take_over_console(&sisusb_dummy_con, i, i, 0);
console_unlock();
/* At this point, con_deinit for all our
* consoles is executed by do_take_over_console().
*/
}
sisusb->haveconsole = 0;
}
vfree((void *)sisusb->scrbuf);
sisusb->scrbuf = 0;
vfree(sisusb->font_backup);
sisusb->font_backup = NULL;
}
void __init sisusb_init_concode(void)
{
int i;
for (i = 0; i < MAX_NR_CONSOLES; i++)
mysisusbs[i] = NULL;
}