[PATCH] Staging: speakup: read scrolled-back VT

[Samuel Thibault]

Previously, speakup would always read the non-scrolled part of the VT,
even when the VT is scrolled back with shift-page.  This patch makes
vt.c export screen_pos so that speakup can use it to properly access
the content of the scrolled-back VT.

This was tested with both vgacon and fbcon.

Signed-off-by: Samuel Thibault <samuel.thiba...@ens-lyon.org>
Reviewed-by: Alan Cox <a...@linux.intel.com>

--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -4250,6 +4250,7 @@ unsigned short *screen_pos(struct vc_dat
 {
        return screenpos(vc, 2 * w_offset, viewed);
 }
+EXPORT_SYMBOL_GPL(screen_pos);
 
 void getconsxy(struct vc_data *vc, unsigned char *p)
 {
--- a/drivers/staging/speakup/main.c
+++ b/drivers/staging/speakup/main.c
@@ -264,8 +264,9 @@ static struct notifier_block vt_notifier
        .notifier_call = vt_notifier_call,
 };
 
-static unsigned char get_attributes(u16 *pos)
+static unsigned char get_attributes(struct vc_data *vc, u16 *pos)
 {
+       pos = screen_pos(vc, pos - (u16 *)vc->vc_origin, 1);
        return (u_char) (scr_readw(pos) >> 8);
 }
 
@@ -275,7 +276,7 @@ static void speakup_date(struct vc_data
        spk_y = spk_cy = vc->vc_y;
        spk_pos = spk_cp = vc->vc_pos;
        spk_old_attr = spk_attr;
-       spk_attr = get_attributes((u_short *) spk_pos);
+       spk_attr = get_attributes(vc, (u_short *)spk_pos);
 }
 
 static void bleep(u_short val)
@@ -469,8 +470,12 @@ static u16 get_char(struct vc_data *vc,
        u16 ch = ' ';
 
        if (vc && pos) {
-               u16 w = scr_readw(pos);
-               u16 c = w & 0xff;
+               u16 w;
+               u16 c;
+
+               pos = screen_pos(vc, pos - (u16 *)vc->vc_origin, 1);
+               w = scr_readw(pos);
+               c = w & 0xff;
 
                if (w & vc->vc_hi_font_mask)
                        c |= 0x100;
@@ -746,7 +751,7 @@ static int get_line(struct vc_data *vc)
        u_char tmp2;
 
        spk_old_attr = spk_attr;
-       spk_attr = get_attributes((u_short *) spk_pos);
+       spk_attr = get_attributes(vc, (u_short *)spk_pos);
        for (i = 0; i < vc->vc_cols; i++) {
                buf[i] = (u_char) get_char(vc, (u_short *) tmp, &tmp2);
                tmp += 2;
@@ -811,7 +816,7 @@ static int say_from_to(struct vc_data *v
        u_short saved_punc_mask = spk_punc_mask;
 
        spk_old_attr = spk_attr;
-       spk_attr = get_attributes((u_short *) from);
+       spk_attr = get_attributes(vc, (u_short *)from);
        while (from < to) {
                buf[i++] = (char)get_char(vc, (u_short *) from, &tmp);
                from += 2;
@@ -886,7 +891,7 @@ static int get_sentence_buf(struct vc_da
        sentmarks[bn][0] = &sentbuf[bn][0];
        i = 0;
        spk_old_attr = spk_attr;
-       spk_attr = get_attributes((u_short *) start);
+       spk_attr = get_attributes(vc, (u_short *)start);
 
        while (start < end) {
                sentbuf[bn][i] = (char)get_char(vc, (u_short *) start, &tmp);
@@ -1585,7 +1590,7 @@ static int count_highlight_color(struct
                u16 *ptr;
 
                for (ptr = start; ptr < end; ptr++) {
-                       ch = get_attributes(ptr);
+                       ch = get_attributes(vc, ptr);
                        bg = (ch & 0x70) >> 4;
                        speakup_console[vc_num]->ht.bgcount[bg]++;
                }
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