diff options
Diffstat (limited to 'drivers/video/console/dummycon.c')
| -rw-r--r-- | drivers/video/console/dummycon.c | 138 |
1 files changed, 109 insertions, 29 deletions
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c index b63860f7beab..7d02470f19b9 100644 --- a/drivers/video/console/dummycon.c +++ b/drivers/video/console/dummycon.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * linux/drivers/video/dummycon.c -- A dummy console driver * @@ -17,16 +18,96 @@ * Dummy console driver */ -#if defined(__arm__) -#define DUMMY_COLUMNS screen_info.orig_video_cols -#define DUMMY_ROWS screen_info.orig_video_lines -#elif defined(__hppa__) +#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_VGA_CONSOLE) +#include <asm/vga.h> +#define DUMMY_COLUMNS vgacon_screen_info.orig_video_cols +#define DUMMY_ROWS vgacon_screen_info.orig_video_lines +#else /* set by Kconfig. Use 80x25 for 640x480 and 160x64 for 1280x1024 */ #define DUMMY_COLUMNS CONFIG_DUMMY_CONSOLE_COLUMNS #define DUMMY_ROWS CONFIG_DUMMY_CONSOLE_ROWS +#endif + +#ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER +/* These are both protected by the console_lock */ +static RAW_NOTIFIER_HEAD(dummycon_output_nh); +static bool dummycon_putc_called; + +void dummycon_register_output_notifier(struct notifier_block *nb) +{ + WARN_CONSOLE_UNLOCKED(); + + raw_notifier_chain_register(&dummycon_output_nh, nb); + + if (dummycon_putc_called) + nb->notifier_call(nb, 0, NULL); +} + +void dummycon_unregister_output_notifier(struct notifier_block *nb) +{ + WARN_CONSOLE_UNLOCKED(); + + raw_notifier_chain_unregister(&dummycon_output_nh, nb); +} + +static void dummycon_putc(struct vc_data *vc, u16 c, unsigned int y, + unsigned int x) +{ + WARN_CONSOLE_UNLOCKED(); + + dummycon_putc_called = true; + raw_notifier_call_chain(&dummycon_output_nh, 0, NULL); +} + +static void dummycon_putcs(struct vc_data *vc, const u16 *s, unsigned int count, + unsigned int ypos, unsigned int xpos) +{ + unsigned int i; + + if (!dummycon_putc_called) { + /* Ignore erases */ + for (i = 0 ; i < count; i++) { + if (s[i] != vc->vc_video_erase_char) + break; + } + if (i == count) + return; + + dummycon_putc_called = true; + } + + raw_notifier_call_chain(&dummycon_output_nh, 0, NULL); +} + +static bool dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank, + bool mode_switch) +{ + /* Redraw, so that we get putc(s) for output done while blanked */ + return true; +} + +static bool dummycon_switch(struct vc_data *vc) +{ + /* + * Redraw, so that we get putc(s) for output done while switched + * away. Informs deferred consoles to take over the display. + */ + return true; +} #else -#define DUMMY_COLUMNS 80 -#define DUMMY_ROWS 25 +static void dummycon_putc(struct vc_data *vc, u16 c, unsigned int y, + unsigned int x) { } +static void dummycon_putcs(struct vc_data *vc, const u16 *s, unsigned int count, + unsigned int ypos, unsigned int xpos) { } +static bool dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank, + bool mode_switch) +{ + return false; +} +static bool dummycon_switch(struct vc_data *vc) +{ + return false; +} #endif static const char *dummycon_startup(void) @@ -34,7 +115,7 @@ static const char *dummycon_startup(void) return "dummy device"; } -static void dummycon_init(struct vc_data *vc, int init) +static void dummycon_init(struct vc_data *vc, bool init) { vc->vc_can_do_color = 1; if (init) { @@ -44,13 +125,18 @@ static void dummycon_init(struct vc_data *vc, int init) vc_resize(vc, DUMMY_COLUMNS, DUMMY_ROWS); } -static int dummycon_dummy(void) +static void dummycon_deinit(struct vc_data *vc) { } +static void dummycon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx, + unsigned int width) { } +static void dummycon_cursor(struct vc_data *vc, bool enable) { } + +static bool dummycon_scroll(struct vc_data *vc, unsigned int top, + unsigned int bottom, enum con_scroll dir, + unsigned int lines) { - return 0; + return false; } -#define DUMMY (void *)dummycon_dummy - /* * The console `switch' structure for the dummy console * @@ -58,22 +144,16 @@ static int dummycon_dummy(void) */ const struct consw dummy_con = { - .owner = THIS_MODULE, - .con_startup = dummycon_startup, - .con_init = dummycon_init, - .con_deinit = DUMMY, - .con_clear = DUMMY, - .con_putc = DUMMY, - .con_putcs = DUMMY, - .con_cursor = DUMMY, - .con_scroll = DUMMY, - .con_bmove = DUMMY, - .con_switch = DUMMY, - .con_blank = DUMMY, - .con_font_set = DUMMY, - .con_font_get = DUMMY, - .con_font_default = DUMMY, - .con_font_copy = DUMMY, - .con_set_palette = DUMMY, - .con_scrolldelta = DUMMY, + .owner = THIS_MODULE, + .con_startup = dummycon_startup, + .con_init = dummycon_init, + .con_deinit = dummycon_deinit, + .con_clear = dummycon_clear, + .con_putc = dummycon_putc, + .con_putcs = dummycon_putcs, + .con_cursor = dummycon_cursor, + .con_scroll = dummycon_scroll, + .con_switch = dummycon_switch, + .con_blank = dummycon_blank, }; +EXPORT_SYMBOL_GPL(dummy_con); |