[PATCH v2] vc: Add support for hiding the cursor when creating VTs

Matthew Garrett
2009-11-13T20:15:07Z

Add support for setting a global default for whether or not a visible
cursor should be enabled when creating VCs. The default will be to do so,
unless overridden by the user at boot time or by a driver.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
---

sorry, sent the wrong version of this to start with.

Documentation/kernel-parameters.txt | 9 +++++++++
drivers/char/vt.c | 11 ++++++++++-
drivers/video/console/vgacon.c | 2 ++
include/linux/vt_kern.h | 3 +++
4 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9107b38..dd42eb6 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2729,6 +2729,15 @@ and is between 256 and 4096 characters. It is defined in the file
Default is 1, i.e. UTF-8 mode is enabled for all
newly opened terminals.

+ vt.global_cursor_default=
+ [VT]
+ Format=<-1|0|1>
+ Set system-wide default for whether a cursor
+ is shown on new VTs. Default is -1,
+ i.e. cursors will be created by default unless
+ overridden by individual drivers. 0 will hide
+ cursors, 1 will display them.
+
waveartist= [HW,OSS]
Format: <io>,<irq>,<dma>,<dma2>

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 0c80c68..1e3d728 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -161,6 +161,8 @@ static void set_palette(struct vc_data *vc);
static int printable; /* Is console ready for printing? */
int default_utf8 = true;
module_param(default_utf8, int, S_IRUGO | S_IWUSR);
+int global_cursor_default = -1;
+module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);

/*
* ignore_poke: don't unblank the screen when things are typed. This is
@@ -775,6 +777,12 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */
vc_cons[currcons].d = NULL;
return -ENOMEM;
}
+
+ /* If no drivers have overridden us and the user didn't pass a
+ boot option, default to displaying the cursor */
+ if (global_cursor_default == -1)
+ global_cursor_default = 1;
+
vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
vcs_make_sysfs(currcons);
atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
@@ -1616,7 +1624,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
vc->vc_decscnm = 0;
vc->vc_decom = 0;
vc->vc_decawm = 1;
- vc->vc_deccm = 1;
+ vc->vc_deccm = global_cursor_default;
vc->vc_decim = 0;

set_kbd(vc, decarm);
@@ -4078,6 +4086,7 @@ EXPORT_SYMBOL(fg_console);
EXPORT_SYMBOL(console_blank_hook);
EXPORT_SYMBOL(console_blanked);
EXPORT_SYMBOL(vc_cons);
+EXPORT_SYMBOL(global_cursor_default);
#ifndef VT_SINGLE_DRIVER
EXPORT_SYMBOL(take_over_console);
EXPORT_SYMBOL(give_up_console);
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index da55cca..564643e 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -585,6 +585,8 @@ static void vgacon_init(struct vc_data *c, int init)
vgacon_uni_pagedir[1]++;
if (!vgacon_uni_pagedir[0] && p)
con_set_default_unimap(c);
+
+ hide_boot_cursor(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
}

static void vgacon_deinit(struct vc_data *c)
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index c0c4e11..7f56db4 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -110,6 +110,7 @@ extern char con_buf[CON_BUF_SIZE];
extern struct mutex con_buf_mtx;
extern char vt_dont_switch;
extern int default_utf8;
+extern int global_cursor_default;

struct vt_spawn_console {
spinlock_t lock;
@@ -130,4 +131,6 @@ struct vt_notifier_param {
extern int register_vt_notifier(struct notifier_block *nb);
extern int unregister_vt_notifier(struct notifier_block *nb);

+extern void hide_boot_cursor(bool hide);
+
#endif /* _VT_KERN_H */
--
1.6.5.2