1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2013 Google, Inc
4  */
5 
6 #include <errno.h>
7 #include <linux/input.h>
8 #include <SDL/SDL.h>
9 #include <sound.h>
10 #include <asm/state.h>
11 
12 static struct sdl_info {
13 	SDL_Surface *screen;
14 	int width;
15 	int height;
16 	int depth;
17 	int pitch;
18 	uint frequency;
19 	uint audio_pos;
20 	uint audio_size;
21 	uint8_t *audio_data;
22 	bool audio_active;
23 	bool inited;
24 } sdl;
25 
sandbox_sdl_poll_events(void)26 static void sandbox_sdl_poll_events(void)
27 {
28 	/*
29 	 * We don't want to include common.h in this file since it uses
30 	 * system headers. So add a declation here.
31 	 */
32 	extern void reset_cpu(unsigned long addr);
33 	SDL_Event event;
34 
35 	while (SDL_PollEvent(&event)) {
36 		switch (event.type) {
37 		case SDL_QUIT:
38 			puts("LCD window closed - quitting\n");
39 			reset_cpu(1);
40 			break;
41 		}
42 	}
43 }
44 
sandbox_sdl_ensure_init(void)45 static int sandbox_sdl_ensure_init(void)
46 {
47 	if (!sdl.inited) {
48 		if (SDL_Init(0) < 0) {
49 			printf("Unable to initialize SDL: %s\n",
50 			       SDL_GetError());
51 			return -EIO;
52 		}
53 
54 		atexit(SDL_Quit);
55 
56 		sdl.inited = true;
57 	}
58 	return 0;
59 }
60 
sandbox_sdl_init_display(int width,int height,int log2_bpp)61 int sandbox_sdl_init_display(int width, int height, int log2_bpp)
62 {
63 	struct sandbox_state *state = state_get_current();
64 	int err;
65 
66 	if (!width || !state->show_lcd)
67 		return 0;
68 	err = sandbox_sdl_ensure_init();
69 	if (err)
70 		return err;
71 	if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
72 		printf("Unable to initialize SDL LCD: %s\n", SDL_GetError());
73 		return -EPERM;
74 	}
75 	SDL_WM_SetCaption("U-Boot", "U-Boot");
76 
77 	sdl.width = width;
78 	sdl.height = height;
79 	sdl.depth = 1 << log2_bpp;
80 	sdl.pitch = sdl.width * sdl.depth / 8;
81 	sdl.screen = SDL_SetVideoMode(width, height, 0, 0);
82 	sandbox_sdl_poll_events();
83 
84 	return 0;
85 }
86 
sandbox_sdl_sync(void * lcd_base)87 int sandbox_sdl_sync(void *lcd_base)
88 {
89 	SDL_Surface *frame;
90 
91 	frame = SDL_CreateRGBSurfaceFrom(lcd_base, sdl.width, sdl.height,
92 			sdl.depth, sdl.pitch,
93 			0x1f << 11, 0x3f << 5, 0x1f << 0, 0);
94 	SDL_BlitSurface(frame, NULL, sdl.screen, NULL);
95 	SDL_FreeSurface(frame);
96 	SDL_UpdateRect(sdl.screen, 0, 0, 0, 0);
97 	sandbox_sdl_poll_events();
98 
99 	return 0;
100 }
101 
102 #define NONE (-1)
103 #define NUM_SDL_CODES	(SDLK_UNDO + 1)
104 
105 static int16_t sdl_to_keycode[NUM_SDL_CODES] = {
106 	/* 0 */
107 	NONE, NONE, NONE, NONE, NONE,
108 	NONE, NONE, NONE, KEY_BACKSPACE, KEY_TAB,
109 	NONE, NONE, NONE, KEY_ENTER, NONE,
110 	NONE, NONE, NONE, NONE, KEY_POWER,	/* use PAUSE as POWER */
111 
112 	/* 20 */
113 	NONE, NONE, NONE, NONE, NONE,
114 	NONE, NONE, KEY_ESC, NONE, NONE,
115 	NONE, NONE, KEY_SPACE, NONE, NONE,
116 	NONE, NONE, NONE, NONE, NONE,
117 
118 	/* 40 */
119 	NONE, NONE, NONE, NONE, KEY_COMMA,
120 	KEY_MINUS, KEY_DOT, KEY_SLASH, KEY_0, KEY_1,
121 	KEY_2, KEY_3, KEY_4, KEY_5, KEY_6,
122 	KEY_7, KEY_8, KEY_9, NONE, KEY_SEMICOLON,
123 
124 	/* 60 */
125 	NONE, KEY_EQUAL, NONE, NONE, NONE,
126 	NONE, NONE, NONE, NONE, NONE,
127 	NONE, NONE, NONE, NONE, NONE,
128 	NONE, NONE, NONE, NONE, NONE,
129 
130 	/* 80 */
131 	NONE, NONE, NONE, NONE, NONE,
132 	NONE, NONE, NONE, NONE, NONE,
133 	NONE, NONE, KEY_BACKSLASH, NONE, NONE,
134 	NONE, KEY_GRAVE, KEY_A, KEY_B, KEY_C,
135 
136 	/* 100 */
137 	KEY_D, KEY_E, KEY_F, KEY_G, KEY_H,
138 	KEY_I, KEY_J, KEY_K, KEY_L, KEY_M,
139 	KEY_N, KEY_O, KEY_P, KEY_Q, KEY_R,
140 	KEY_S, KEY_T, KEY_U, KEY_V, KEY_W,
141 
142 	/* 120 */
143 	KEY_X, KEY_Y, KEY_Z, NONE, NONE,
144 	NONE, NONE, KEY_DELETE, NONE, NONE,
145 	NONE, NONE, NONE, NONE, NONE,
146 	NONE, NONE, NONE, NONE, NONE,
147 
148 	/* 140 */
149 	NONE, NONE, NONE, NONE, NONE,
150 	NONE, NONE, NONE, NONE, NONE,
151 	NONE, NONE, NONE, NONE, NONE,
152 	NONE, NONE, NONE, NONE, NONE,
153 
154 	/* 160 */
155 	NONE, NONE, NONE, NONE, NONE,
156 	NONE, NONE, NONE, NONE, NONE,
157 	NONE, NONE, NONE, NONE, NONE,
158 	NONE, NONE, NONE, NONE, NONE,
159 
160 	/* 180 */
161 	NONE, NONE, NONE, NONE, NONE,
162 	NONE, NONE, NONE, NONE, NONE,
163 	NONE, NONE, NONE, NONE, NONE,
164 	NONE, NONE, NONE, NONE, NONE,
165 
166 	/* 200 */
167 	NONE, NONE, NONE, NONE, NONE,
168 	NONE, NONE, NONE, NONE, NONE,
169 	NONE, NONE, NONE, NONE, NONE,
170 	NONE, NONE, NONE, NONE, NONE,
171 
172 	/* 220 */
173 	NONE, NONE, NONE, NONE, NONE,
174 	NONE, NONE, NONE, NONE, NONE,
175 	NONE, NONE, NONE, NONE, NONE,
176 	NONE, NONE, NONE, NONE, NONE,
177 
178 	/* 240 */
179 	NONE, NONE, NONE, NONE, NONE,
180 	NONE, NONE, NONE, NONE, NONE,
181 	NONE, NONE, NONE, NONE, NONE,
182 	NONE, KEY_KP0, KEY_KP1, KEY_KP2, KEY_KP3,
183 
184 	/* 260 */
185 	KEY_KP4, KEY_KP5, KEY_KP6, KEY_KP7, KEY_KP8,
186 	KEY_KP9, KEY_KPDOT, KEY_KPSLASH, KEY_KPASTERISK, KEY_KPMINUS,
187 	KEY_KPPLUS, KEY_KPENTER, KEY_KPEQUAL, KEY_UP, KEY_DOWN,
188 	KEY_RIGHT, KEY_LEFT, KEY_INSERT, KEY_HOME, KEY_END,
189 
190 	/* 280 */
191 	KEY_PAGEUP, KEY_PAGEDOWN, KEY_F1, KEY_F2, KEY_F3,
192 	KEY_F4, KEY_F5, KEY_F6, KEY_F7, KEY_F8,
193 	KEY_F9, KEY_F10, KEY_F11, KEY_F12, NONE,
194 	NONE, NONE, NONE, NONE, NONE,
195 
196 	/* 300 */
197 	KEY_NUMLOCK, KEY_CAPSLOCK, KEY_SCROLLLOCK, KEY_RIGHTSHIFT,
198 		KEY_LEFTSHIFT,
199 	KEY_RIGHTCTRL, KEY_LEFTCTRL, KEY_RIGHTALT, KEY_LEFTALT, KEY_RIGHTMETA,
200 	KEY_LEFTMETA, NONE, KEY_FN, NONE, KEY_COMPOSE,
201 	NONE, KEY_PRINT, KEY_SYSRQ, KEY_PAUSE, NONE,
202 
203 	/* 320 */
204 	NONE, NONE, NONE,
205 };
206 
sandbox_sdl_scan_keys(int key[],int max_keys)207 int sandbox_sdl_scan_keys(int key[], int max_keys)
208 {
209 	Uint8 *keystate;
210 	int i, count;
211 
212 	sandbox_sdl_poll_events();
213 	keystate = SDL_GetKeyState(NULL);
214 	for (i = count = 0; i < NUM_SDL_CODES; i++) {
215 		if (count >= max_keys)
216 			break;
217 		else if (keystate[i])
218 			key[count++] = sdl_to_keycode[i];
219 	}
220 
221 	return count;
222 }
223 
sandbox_sdl_key_pressed(int keycode)224 int sandbox_sdl_key_pressed(int keycode)
225 {
226 	int key[8];	/* allow up to 8 keys to be pressed at once */
227 	int count;
228 	int i;
229 
230 	count = sandbox_sdl_scan_keys(key, sizeof(key) / sizeof(key[0]));
231 	for (i = 0; i < count; i++) {
232 		if (key[i] == keycode)
233 			return 0;
234 	}
235 
236 	return -ENOENT;
237 }
238 
sandbox_sdl_fill_audio(void * udata,Uint8 * stream,int len)239 void sandbox_sdl_fill_audio(void *udata, Uint8 *stream, int len)
240 {
241 	int avail;
242 
243 	avail = sdl.audio_size - sdl.audio_pos;
244 	if (avail < len)
245 		len = avail;
246 
247 	SDL_MixAudio(stream, sdl.audio_data + sdl.audio_pos, len,
248 		     SDL_MIX_MAXVOLUME);
249 	sdl.audio_pos += len;
250 
251 	/* Loop if we are at the end */
252 	if (sdl.audio_pos == sdl.audio_size)
253 		sdl.audio_pos = 0;
254 }
255 
sandbox_sdl_sound_init(void)256 int sandbox_sdl_sound_init(void)
257 {
258 	SDL_AudioSpec wanted;
259 
260 	if (sandbox_sdl_ensure_init())
261 		return -1;
262 
263 	if (sdl.audio_active)
264 		return 0;
265 
266 	/*
267 	 * At present all sandbox sounds crash. This is probably due to
268 	 * symbol name conflicts with U-Boot. We can remove the malloc()
269 	 * probles with:
270 	 *
271 	 * #define USE_DL_PREFIX
272 	 *
273 	 * and get this:
274 	 *
275 	 * Assertion 'e->pollfd->fd == e->fd' failed at pulse/mainloop.c:676,
276 	 *		function dispatch_pollfds(). Aborting.
277 	 *
278 	 * The right solution is probably to make U-Boot's names private or
279 	 * link os.c and sdl.c against their libraries before liking with
280 	 * U-Boot. TBD. For now sound is disabled.
281 	 */
282 	printf("(Warning: sandbox sound disabled)\n");
283 	return 0;
284 
285 	/* Set the audio format */
286 	wanted.freq = 22050;
287 	wanted.format = AUDIO_S16;
288 	wanted.channels = 1;    /* 1 = mono, 2 = stereo */
289 	wanted.samples = 1024;  /* Good low-latency value for callback */
290 	wanted.callback = sandbox_sdl_fill_audio;
291 	wanted.userdata = NULL;
292 
293 	sdl.audio_size = sizeof(uint16_t) * wanted.freq;
294 	sdl.audio_data = malloc(sdl.audio_size);
295 	if (!sdl.audio_data) {
296 		printf("%s: Out of memory\n", __func__);
297 		return -1;
298 	}
299 	sdl.audio_pos = 0;
300 
301 	if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
302 		printf("Unable to initialize SDL audio: %s\n", SDL_GetError());
303 		goto err;
304 	}
305 
306 	/* Open the audio device, forcing the desired format */
307 	if (SDL_OpenAudio(&wanted, NULL) < 0) {
308 		printf("Couldn't open audio: %s\n", SDL_GetError());
309 		goto err;
310 	}
311 	sdl.audio_active = true;
312 
313 	return 0;
314 
315 err:
316 	free(sdl.audio_data);
317 	return -1;
318 }
319 
sandbox_sdl_sound_start(uint frequency)320 int sandbox_sdl_sound_start(uint frequency)
321 {
322 	if (!sdl.audio_active)
323 		return -1;
324 	sdl.frequency = frequency;
325 	sound_create_square_wave((unsigned short *)sdl.audio_data,
326 				 sdl.audio_size, frequency);
327 	sdl.audio_pos = 0;
328 	SDL_PauseAudio(0);
329 
330 	return 0;
331 }
332 
sandbox_sdl_sound_stop(void)333 int sandbox_sdl_sound_stop(void)
334 {
335 	if (!sdl.audio_active)
336 		return -1;
337 	SDL_PauseAudio(1);
338 
339 	return 0;
340 }
341