--- /dev/null
+/*
+ * 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"
+
+#ifdef INCL_SISUSB_CON
+
+#define sisusbcon_writew(val, addr) (*(addr) = (val))
+#define sisusbcon_readw(addr) (*(addr))
+#define sisusbcon_memmovew(d, s, c) memmove(d, s, c)
+#define sisusbcon_memcpyw(d, s, c) memcpy(d, s, c)
+
+/* 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)
+{
+ count /= 2;
+ while (count--)
+ sisusbcon_writew(c, s++);
+}
+
+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;
+
+ if (!(sisusb = sisusb_get_sisusb(console)))
+ 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.
+ */
+
+ if (!(sisusb = sisusb_get_sisusb(c->vc_num)))
+ 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->vc_uni_pagedir_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.
+ */
+
+ if (!(sisusb = sisusb_get_sisusb(c->vc_num)))
+ 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, u8 intensity,
+ u8 blink, u8 underline, u8 reverse, u8 unused)
+{
+ u8 attr = color;
+
+ if (underline)
+ attr = (attr & 0xf0) | c->vc_ulcolor;
+ else if (intensity == 0)
+ attr = (attr & 0xf0) | c->vc_halfcolor;
+
+ if (reverse)
+ attr = ((attr) & 0x88) |
+ ((((attr) >> 4) |
+ ((attr) << 4)) & 0x77);
+
+ if (blink)
+ attr ^= 0x80;
+
+ if (intensity == 2)
+ 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 = sisusbcon_readw(p);
+
+ a = ((a) & 0x88ff) |
+ (((a) & 0x7000) >> 4) |
+ (((a) & 0x0700) << 4);
+
+ sisusbcon_writew(a, p++);
+ }
+}
+
+#define SISUSB_VADDR(x,y) \
+ ((u16 *)c->vc_origin + \
+ (y) * sisusb->sisusb_num_columns + \
+ (x))
+
+#define SISUSB_HADDR(x,y) \
+ ((u16 *)(sisusb->vrambase + (c->vc_origin - sisusb->scrbuf)) + \
+ (y) * sisusb->sisusb_num_columns + \
+ (x))
+
+/* Interface routine */
+static void
+sisusbcon_putc(struct vc_data *c, int ch, int y, int x)
+{
+ struct sisusb_usb_data *sisusb;
+ ssize_t written;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return;
+
+ /* sisusb->lock is down */
+ if (sisusb_is_inactive(c, sisusb)) {
+ mutex_unlock(&sisusb->lock);
+ return;
+ }
+
+
+ sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(x, y),
+ (long)SISUSB_HADDR(x, y), 2, &written);
+
+ 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;
+ ssize_t written;
+ u16 *dest;
+ int i;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return;
+
+ /* sisusb->lock is down */
+
+ /* Need to put the characters into the buffer ourselves,
+ * because the vt does this AFTER calling us.
+ */
+
+ dest = SISUSB_VADDR(x, y);
+
+ for (i = count; i > 0; i--)
+ sisusbcon_writew(sisusbcon_readw(s++), dest++);
+
+ if (sisusb_is_inactive(c, sisusb)) {
+ mutex_unlock(&sisusb->lock);
+ return;
+ }
+
+ sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(x, y),
+ (long)SISUSB_HADDR(x, y), count * 2, &written);
+
+ 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;
+ ssize_t written;
+ int i, length, cols;
+ u16 *dest;
+
+ if (width <= 0 || height <= 0)
+ return;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return;
+
+ /* sisusb->lock is down */
+
+ /* Need to clear buffer ourselves, because the vt does
+ * this AFTER calling us.
+ */
+
+ dest = SISUSB_VADDR(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, (unsigned char *)SISUSB_VADDR(x, y),
+ (long)SISUSB_HADDR(x, y), length, &written);
+
+ mutex_unlock(&sisusb->lock);
+}
+
+/* Interface routine */
+static void
+sisusbcon_bmove(struct vc_data *c, int sy, int sx,
+ int dy, int dx, int height, int width)
+{
+ struct sisusb_usb_data *sisusb;
+ ssize_t written;
+ int cols, length;
+
+ if (width <= 0 || height <= 0)
+ return;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return;
+
+ /* sisusb->lock is down */
+
+ cols = sisusb->sisusb_num_columns;
+
+ if (sisusb_is_inactive(c, sisusb)) {
+ mutex_unlock(&sisusb->lock);
+ return;
+ }
+
+ length = ((height * cols) - dx - (cols - width - dx)) * 2;
+
+
+ sisusb_copy_memory(sisusb, (unsigned char *)SISUSB_VADDR(dx, dy),
+ (long)SISUSB_HADDR(dx, dy), length, &written);
+
+ mutex_unlock(&sisusb->lock);
+}
+
+/* interface routine */
+static int
+sisusbcon_switch(struct vc_data *c)
+{
+ struct sisusb_usb_data *sisusb;
+ ssize_t written;
+ 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.
+ */
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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 */
+ sisusbcon_memcpyw((u16 *)c->vc_origin, (u16 *)c->vc_screenbuf,
+ length);
+
+ sisusb_copy_memory(sisusb, (unsigned char *)c->vc_origin,
+ (long)SISUSB_HADDR(0, 0),
+ length, &written);
+
+ 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.
+ */
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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 */
+ sisusbcon_memcpyw((u16 *)c->vc_screenbuf, (u16 *)c->vc_origin,
+ length);
+
+ mutex_unlock(&sisusb->lock);
+}
+
+/* interface routine */
+static int
+sisusbcon_set_palette(struct vc_data *c, unsigned char *table)
+{
+ struct sisusb_usb_data *sisusb;
+ int i, j;
+
+ /* Return value not used by vt */
+
+ if (!CON_IS_VISIBLE(c))
+ return -EINVAL;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return -EINVAL;
+
+ /* sisusb->lock is down */
+
+ if (sisusb_is_inactive(c, sisusb)) {
+ mutex_unlock(&sisusb->lock);
+ return -EINVAL;
+ }
+
+ 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);
+
+ return 0;
+}
+
+/* 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;
+ ssize_t written;
+ int ret = 0;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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,
+ (unsigned char *)c->vc_origin,
+ (u32)(sisusb->vrambase +
+ (c->vc_origin - sisusb->scrbuf)),
+ c->vc_screenbuf_size, &written);
+ 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 int
+sisusbcon_scrolldelta(struct vc_data *c, int lines)
+{
+ struct sisusb_usb_data *sisusb;
+ int margin = c->vc_size_row * 4;
+ int ul, we, p, st;
+
+ /* The return value does not seem to be used */
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return 0;
+
+ /* sisusb->lock is down */
+
+ if (sisusb_is_inactive(c, sisusb)) {
+ mutex_unlock(&sisusb->lock);
+ return 0;
+ }
+
+ if (!lines) /* Turn scrollback off */
+ c->vc_visible_origin = c->vc_origin;
+ else {
+
+ if (sisusb->con_rolled_over >
+ (c->vc_scr_end - sisusb->scrbuf) + margin) {
+
+ ul = c->vc_scr_end - sisusb->scrbuf;
+ we = sisusb->con_rolled_over + c->vc_size_row;
+
+ } else {
+
+ ul = 0;
+ we = sisusb->scrbuf_size;
+
+ }
+
+ p = (c->vc_visible_origin - sisusb->scrbuf - ul + we) % we +
+ lines * c->vc_size_row;
+
+ st = (c->vc_origin - sisusb->scrbuf - ul + we) % we;
+
+ if (st < 2 * margin)
+ margin = 0;
+
+ if (p < margin)
+ p = 0;
+
+ if (p > st - margin)
+ p = st;
+
+ c->vc_visible_origin = sisusb->scrbuf + (p + ul) % we;
+ }
+
+ sisusbcon_set_start_address(sisusb, c);
+
+ mutex_unlock(&sisusb->lock);
+
+ return 1;
+}
+
+/* Interface routine */
+static void
+sisusbcon_cursor(struct vc_data *c, int mode)
+{
+ struct sisusb_usb_data *sisusb;
+ int from, to, baseline;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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 (c->vc_cursor_type & 0x0f) {
+ 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 int
+sisusbcon_scroll_area(struct vc_data *c, struct sisusb_usb_data *sisusb,
+ int t, int b, int dir, int lines)
+{
+ int cols = sisusb->sisusb_num_columns;
+ int length = ((b - t) * cols) * 2;
+ u16 eattr = c->vc_video_erase_char;
+ ssize_t written;
+
+ /* 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:
+ sisusbcon_memmovew(SISUSB_VADDR(0, t),
+ SISUSB_VADDR(0, t + lines),
+ (b - t - lines) * cols * 2);
+ sisusbcon_memsetw(SISUSB_VADDR(0, b - lines), eattr,
+ lines * cols * 2);
+ break;
+
+ case SM_DOWN:
+ sisusbcon_memmovew(SISUSB_VADDR(0, t + lines),
+ SISUSB_VADDR(0, t),
+ (b - t - lines) * cols * 2);
+ sisusbcon_memsetw(SISUSB_VADDR(0, t), eattr,
+ lines * cols * 2);
+ break;
+ }
+
+ sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(0, t),
+ (long)SISUSB_HADDR(0, t), length, &written);
+
+ mutex_unlock(&sisusb->lock);
+
+ return 1;
+}
+
+/* Interface routine */
+static int
+sisusbcon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
+{
+ struct sisusb_usb_data *sisusb;
+ u16 eattr = c->vc_video_erase_char;
+ ssize_t written;
+ int copyall = 0;
+ unsigned long oldorigin;
+ unsigned int delta = lines * c->vc_size_row;
+ u32 originoffset;
+
+ /* 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 1;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ return 0;
+
+ /* sisusb->lock is down */
+
+ if (sisusb_is_inactive(c, sisusb)) {
+ mutex_unlock(&sisusb->lock);
+ return 0;
+ }
+
+ /* 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) {
+ sisusbcon_memcpyw((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) {
+ sisusbcon_memmovew((u16 *)(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;
+ }
+
+ originoffset = (u32)(c->vc_origin - sisusb->scrbuf);
+
+ if (copyall)
+ sisusb_copy_memory(sisusb,
+ (char *)c->vc_origin,
+ (u32)(sisusb->vrambase + originoffset),
+ c->vc_screenbuf_size, &written);
+ else if (dir == SM_UP)
+ sisusb_copy_memory(sisusb,
+ (char *)c->vc_origin + c->vc_screenbuf_size - delta,
+ (u32)sisusb->vrambase + originoffset +
+ c->vc_screenbuf_size - delta,
+ delta, &written);
+ else
+ sisusb_copy_memory(sisusb,
+ (char *)c->vc_origin,
+ (u32)(sisusb->vrambase + originoffset),
+ delta, &written);
+
+ 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 1;
+}
+
+/* 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.
+ */
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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 1;
+}
+
+/* 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;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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 flags)
+{
+ struct sisusb_usb_data *sisusb;
+ unsigned charcount = font->charcount;
+
+ if (font->width != 8 || (charcount != 256 && charcount != 512))
+ return -EINVAL;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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(charcount * 32);
+
+ if (sisusb->font_backup) {
+ memcpy(sisusb->font_backup, font->data, 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;
+
+ if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
+ 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_bmove = sisusbcon_bmove,
+ .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 int sisusbdummycon_dummy(void)
+{
+ return 0;
+}
+
+#define SISUSBCONDUMMY (void *)sisusbdummycon_dummy
+
+static const struct consw sisusb_dummy_con = {
+ .owner = THIS_MODULE,
+ .con_startup = sisusbdummycon_startup,
+ .con_init = sisusbdummycon_init,
+ .con_deinit = SISUSBCONDUMMY,
+ .con_clear = SISUSBCONDUMMY,
+ .con_putc = SISUSBCONDUMMY,
+ .con_putcs = SISUSBCONDUMMY,
+ .con_cursor = SISUSBCONDUMMY,
+ .con_scroll = SISUSBCONDUMMY,
+ .con_bmove = SISUSBCONDUMMY,
+ .con_switch = SISUSBCONDUMMY,
+ .con_blank = SISUSBCONDUMMY,
+ .con_font_set = SISUSBCONDUMMY,
+ .con_font_get = SISUSBCONDUMMY,
+ .con_font_default = SISUSBCONDUMMY,
+ .con_font_copy = SISUSBCONDUMMY,
+ .con_set_palette = SISUSBCONDUMMY,
+ .con_scrolldelta = SISUSBCONDUMMY,
+};
+
+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;
+}
+
+#endif /* INCL_CON */
+
+
+
Code Review / kvmfornfv.git / blobdiff