1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Minimalistic braille device kernel support.
5  * By default, shows console messages on the braille device.
8  *  Copyright (C) Samuel Thibault <samuel.thibault@ens-lyon.org>
25 MODULE_AUTHOR("samuel.thibault@ens-lyon.org");
26 MODULE_DESCRIPTION("braille device");
30  * Braille device support part.
45 #define WIDTH 40  macro
47 static u16 console_buf[WIDTH];
57 static int lastVC = -1;
61 /* Very VisioBraille-specific */
64 	static u16 lastwrite[WIDTH];  in braille_write()
65 	unsigned char data[1 + 1 + 2*WIDTH + 2 + 1], csum = 0, *c;  in braille_write()
72 	if (!memcmp(lastwrite, buf, WIDTH * sizeof(*buf)))  in braille_write()
74 	memcpy(lastwrite, buf, WIDTH * sizeof(*buf));  in braille_write()
85 	for (i = 0; i < WIDTH; i++) {  in braille_write()
106 	braille_co->write(braille_co, data, c - data);  in braille_write()
112 	vc_x = vc->state.x - (vc->state.x % WIDTH);  in vc_follow_cursor()
113 	vc_y = vc->state.y;  in vc_follow_cursor()
114 	lastvc_x = vc->state.x;  in vc_follow_cursor()
115 	lastvc_y = vc->state.y;  in vc_follow_cursor()
121 	if (vc->state.x != lastvc_x || vc->state.y != lastvc_y)  in vc_maybe_cursor_moved()
128 	u16 buf[WIDTH];  in vc_refresh()
131 	for (i = 0; i < WIDTH; i++) {  in vc_refresh()
133 				2 * (vc_x + i) + vc_y * vc->vc_size_row);  in vc_refresh()
147 	struct vc_data *vc = param->vc;  in keyboard_notifier_call()
150 	if (!param->down)  in keyboard_notifier_call()
156 			if (param->value == BRAILLE_KEY) {  in keyboard_notifier_call()
165 			switch (param->value) {  in keyboard_notifier_call()
169 				lastVC = -1;  in keyboard_notifier_call()
174 					vc_x -= WIDTH;  in keyboard_notifier_call()
179 					vc_y--;  in keyboard_notifier_call()
180 					vc_x = vc->vc_cols-WIDTH;  in keyboard_notifier_call()
185 				if (vc_x + WIDTH < vc->vc_cols) {  in keyboard_notifier_call()
186 					vc_x += WIDTH;  in keyboard_notifier_call()
187 				} else if (vc_y + 1 < vc->vc_rows) {  in keyboard_notifier_call()
195 				if (vc_y + 1 < vc->vc_rows)  in keyboard_notifier_call()
202 					vc_y--;  in keyboard_notifier_call()
215 				vc_y = vc->vc_rows-1;  in keyboard_notifier_call()
227 		unsigned char type = KTYP(param->value) - 0xf0;  in keyboard_notifier_call()
230 			unsigned char val = KVAL(param->value);  in keyboard_notifier_call()
231 			int on_off = -1;  in keyboard_notifier_call()
268 	struct vc_data *vc = param->vc;  in vt_notifier_call()
277 		unsigned char c = param->c;  in vt_notifier_call()
279 		if (vc->vc_num != fg_console)  in vt_notifier_call()
285 				console_cursor--;  in vt_notifier_call()
307 			if (console_cursor == WIDTH)  in vt_notifier_call()
309 					(WIDTH-1) * sizeof(*console_buf));  in vt_notifier_call()
312 			console_buf[console_cursor-1] = c;  in vt_notifier_call()
326 			if (vc->vc_num != lastVC) {  in vt_notifier_call()
327 				lastVC = vc->vc_num;  in vt_notifier_call()
358 		return -ENODEV;  in braille_register_console()
359 	if (console->setup) {  in braille_register_console()
360 		ret = console->setup(console, console_options);  in braille_register_console()
364 	console->flags |= CON_ENABLED;  in braille_register_console()
365 	console->index = index;  in braille_register_console()
375 		return -EINVAL;  in braille_unregister_console()