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Ethan Yonkerfbb43532015-12-28 21:54:50 +01001/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdbool.h>
18#include <stdlib.h>
19#include <string.h>
20#include <unistd.h>
21
22#include <fcntl.h>
23#include <stdio.h>
24
25#include <sys/cdefs.h>
26#include <sys/ioctl.h>
27#include <sys/mman.h>
28#include <sys/types.h>
29
30#include <linux/fb.h>
31#include <linux/kd.h>
32
33#include "minui.h"
34#include "graphics.h"
35#include <pixelflinger/pixelflinger.h>
36
37static GRSurface* fbdev_init(minui_backend*);
38static GRSurface* fbdev_flip(minui_backend*);
39static void fbdev_blank(minui_backend*, bool);
40static void fbdev_exit(minui_backend*);
41
42static GRSurface gr_framebuffer[2];
43static bool double_buffered;
44static GRSurface* gr_draw = NULL;
45static int displayed_buffer;
46
47static fb_var_screeninfo vi;
48static int fb_fd = -1;
49static __u32 smem_len;
50
51static minui_backend my_backend = {
52 .init = fbdev_init,
53 .flip = fbdev_flip,
54 .blank = fbdev_blank,
55 .exit = fbdev_exit,
56};
57
58minui_backend* open_fbdev() {
59 return &my_backend;
60}
61
62static void fbdev_blank(minui_backend* backend __unused, bool blank)
63{
64#if defined(TW_NO_SCREEN_BLANK) && defined(TW_BRIGHTNESS_PATH) && defined(TW_MAX_BRIGHTNESS)
65 int fd;
66 char brightness[4];
67 snprintf(brightness, 4, "%03d", TW_MAX_BRIGHTNESS/2);
68
69 fd = open(TW_BRIGHTNESS_PATH, O_RDWR);
70 if (fd < 0) {
71 perror("cannot open LCD backlight");
72 return;
73 }
74 write(fd, blank ? "000" : brightness, 3);
75 close(fd);
AdrianDC2948b6f2016-02-07 03:44:44 +010076
77#ifdef TW_SECONDARY_BRIGHTNESS_PATH
78 fd = open(TW_SECONDARY_BRIGHTNESS_PATH, O_RDWR);
79 if (fd < 0) {
80 perror("cannot open LCD backlight 2");
81 return;
82 }
83 write(fd, blank ? "000" : brightness, 3);
84 close(fd);
85#endif
Ethan Yonkerfbb43532015-12-28 21:54:50 +010086#else
87#ifndef TW_NO_SCREEN_BLANK
88 int ret;
89
90 ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
91 if (ret < 0)
92 perror("ioctl(): blank");
93#endif
94#endif
95}
96
97static void set_displayed_framebuffer(unsigned n)
98{
99 if (n > 1 || !double_buffered) return;
100
101 vi.yres_virtual = gr_framebuffer[0].height * 2;
102 vi.yoffset = n * gr_framebuffer[0].height;
103 vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8;
104 if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
105 perror("active fb swap failed");
Muhammad Fahad Baig0ac22932016-04-07 09:19:33 +0100106#ifdef TW_FBIOPAN
107 } else {
108 if (ioctl(fb_fd, FBIOPAN_DISPLAY, &vi) < 0) {
109 perror("pan failed");
110 }
111#endif
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100112 }
113 displayed_buffer = n;
114}
115
116static GRSurface* fbdev_init(minui_backend* backend) {
thatb9d8f622016-02-22 21:09:09 +0100117 int retry = 20;
118 int fd = -1;
119 while (fd == -1) {
120 fd = open("/dev/graphics/fb0", O_RDWR);
121 if (fd == -1) {
122 if (--retry) {
123 // wait for init to create the device node
124 perror("cannot open fb0 (retrying)");
125 usleep(100000);
126 } else {
127 perror("cannot open fb0 (giving up)");
128 return NULL;
129 }
130 }
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100131 }
132
Aaron Klingb9e547e2016-05-26 14:49:33 -0500133 if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
134 perror("failed to get fb0 info (FBIOGET_VSCREENINFO)");
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100135 close(fd);
136 return NULL;
137 }
138
Aaron Klingb9e547e2016-05-26 14:49:33 -0500139#ifdef RECOVERY_FORCE_RGB_565
140 // Changing fb_var_screeninfo can affect fb_fix_screeninfo,
141 // so this needs done before querying for fi.
142 printf("Forcing pixel format: RGB_565\n");
143 vi.blue.offset = 0;
144 vi.green.offset = 5;
145 vi.red.offset = 11;
146 vi.blue.length = 5;
147 vi.green.length = 6;
148 vi.red.length = 5;
149 vi.blue.msb_right = 0;
150 vi.green.msb_right = 0;
151 vi.red.msb_right = 0;
152 vi.transp.offset = 0;
153 vi.transp.length = 0;
154 vi.bits_per_pixel = 16;
155
156 if (ioctl(fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
157 perror("failed to put force_rgb_565 fb0 info");
158 close(fd);
159 return NULL;
160 }
161#endif
162
163 fb_fix_screeninfo fi;
164 if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
165 perror("failed to get fb0 info (FBIOGET_FSCREENINFO)");
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100166 close(fd);
167 return NULL;
168 }
169
170 // We print this out for informational purposes only, but
171 // throughout we assume that the framebuffer device uses an RGBX
172 // pixel format. This is the case for every development device I
173 // have access to. For some of those devices (eg, hammerhead aka
174 // Nexus 5), FBIOGET_VSCREENINFO *reports* that it wants a
175 // different format (XBGR) but actually produces the correct
176 // results on the display when you write RGBX.
177 //
178 // If you have a device that actually *needs* another pixel format
179 // (ie, BGRX, or 565), patches welcome...
180
181 printf("fb0 reports (possibly inaccurate):\n"
182 " vi.bits_per_pixel = %d\n"
183 " vi.red.offset = %3d .length = %3d\n"
184 " vi.green.offset = %3d .length = %3d\n"
185 " vi.blue.offset = %3d .length = %3d\n",
186 vi.bits_per_pixel,
187 vi.red.offset, vi.red.length,
188 vi.green.offset, vi.green.length,
189 vi.blue.offset, vi.blue.length);
190
191 void* bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
192 if (bits == MAP_FAILED) {
193 perror("failed to mmap framebuffer");
194 close(fd);
195 return NULL;
196 }
197
198 memset(bits, 0, fi.smem_len);
199
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100200 gr_framebuffer[0].width = vi.xres;
201 gr_framebuffer[0].height = vi.yres;
202 gr_framebuffer[0].row_bytes = fi.line_length;
203 gr_framebuffer[0].pixel_bytes = vi.bits_per_pixel / 8;
Ethan Yonker31f855b2016-01-28 22:31:48 -0600204#ifdef RECOVERY_GRAPHICS_FORCE_USE_LINELENGTH
205 printf("Forcing line length\n");
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100206 vi.xres_virtual = fi.line_length / gr_framebuffer[0].pixel_bytes;
207#endif
208 gr_framebuffer[0].data = reinterpret_cast<uint8_t*>(bits);
209 if (vi.bits_per_pixel == 16) {
210 printf("setting GGL_PIXEL_FORMAT_RGB_565\n");
211 gr_framebuffer[0].format = GGL_PIXEL_FORMAT_RGB_565;
Ziyan4fea38a2016-01-28 01:19:35 +0100212 } else if (vi.red.offset == 8 || vi.red.offset == 16) {
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100213 printf("setting GGL_PIXEL_FORMAT_BGRA_8888\n");
214 gr_framebuffer[0].format = GGL_PIXEL_FORMAT_BGRA_8888;
215 } else if (vi.red.offset == 0) {
216 printf("setting GGL_PIXEL_FORMAT_RGBA_8888\n");
217 gr_framebuffer[0].format = GGL_PIXEL_FORMAT_RGBA_8888;
218 } else if (vi.red.offset == 24) {
219 printf("setting GGL_PIXEL_FORMAT_RGBX_8888\n");
220 gr_framebuffer[0].format = GGL_PIXEL_FORMAT_RGBX_8888;
221 } else {
222 if (vi.red.length == 8) {
223 printf("No valid pixel format detected, trying GGL_PIXEL_FORMAT_RGBX_8888\n");
224 gr_framebuffer[0].format = GGL_PIXEL_FORMAT_RGBX_8888;
225 } else {
226 printf("No valid pixel format detected, trying GGL_PIXEL_FORMAT_RGB_565\n");
227 gr_framebuffer[0].format = GGL_PIXEL_FORMAT_RGB_565;
228 }
229 }
230
231 // Drawing directly to the framebuffer takes about 5 times longer.
232 // Instead, we will allocate some memory and draw to that, then
233 // memcpy the data into the framebuffer later.
234 gr_draw = (GRSurface*) malloc(sizeof(GRSurface));
235 if (!gr_draw) {
236 perror("failed to allocate gr_draw");
237 close(fd);
238 munmap(bits, fi.smem_len);
239 return NULL;
240 }
241 memcpy(gr_draw, gr_framebuffer, sizeof(GRSurface));
242 gr_draw->data = (unsigned char*) calloc(gr_draw->height * gr_draw->row_bytes, 1);
243 if (!gr_draw->data) {
244 perror("failed to allocate in-memory surface");
245 close(fd);
246 free(gr_draw);
247 munmap(bits, fi.smem_len);
248 return NULL;
249 }
250
251 /* check if we can use double buffering */
Ethan Yonker4a71d4f2016-07-29 17:42:36 -0500252#ifndef RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100253 if (vi.yres * fi.line_length * 2 <= fi.smem_len) {
254 double_buffered = true;
255 printf("double buffered\n");
256
257 memcpy(gr_framebuffer+1, gr_framebuffer, sizeof(GRSurface));
258 gr_framebuffer[1].data = gr_framebuffer[0].data +
259 gr_framebuffer[0].height * gr_framebuffer[0].row_bytes;
260
261 } else {
Ethan Yonker4a71d4f2016-07-29 17:42:36 -0500262#else
263 {
264 printf("RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER := true\n");
265#endif
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100266 double_buffered = false;
267 printf("single buffered\n");
268 }
269#if defined(RECOVERY_BGRA)
270 printf("RECOVERY_BGRA\n");
271#endif
272 fb_fd = fd;
273 set_displayed_framebuffer(0);
274
275 printf("framebuffer: %d (%d x %d)\n", fb_fd, gr_draw->width, gr_draw->height);
276
277 fbdev_blank(backend, true);
278 fbdev_blank(backend, false);
279
280 smem_len = fi.smem_len;
281
282 return gr_draw;
283}
284
285static GRSurface* fbdev_flip(minui_backend* backend __unused) {
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100286#if defined(RECOVERY_BGRA)
Ethan Yonker871b07f2016-02-01 10:31:59 -0600287 // In case of BGRA, do some byte swapping
Ethan Yonker871b07f2016-02-01 10:31:59 -0600288 unsigned char* ucfb_vaddr = (unsigned char*)gr_draw->data;
Simon Shifcfc6342019-01-16 13:27:01 +0800289 for (int idx = 0 ; idx < (gr_draw->height * gr_draw->row_bytes);
Ethan Yonker871b07f2016-02-01 10:31:59 -0600290 idx += 4) {
Simon Shifcfc6342019-01-16 13:27:01 +0800291 unsigned char tmp = ucfb_vaddr[idx];
Ethan Yonker871b07f2016-02-01 10:31:59 -0600292 ucfb_vaddr[idx ] = ucfb_vaddr[idx + 2];
293 ucfb_vaddr[idx + 2] = tmp;
294 }
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100295#endif
Ethan Yonker871b07f2016-02-01 10:31:59 -0600296#ifndef BOARD_HAS_FLIPPED_SCREEN
297 if (double_buffered) {
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100298 // Copy from the in-memory surface to the framebuffer.
299 memcpy(gr_framebuffer[1-displayed_buffer].data, gr_draw->data,
300 gr_draw->height * gr_draw->row_bytes);
301 set_displayed_framebuffer(1-displayed_buffer);
302 } else {
303 // Copy from the in-memory surface to the framebuffer.
304 memcpy(gr_framebuffer[0].data, gr_draw->data,
305 gr_draw->height * gr_draw->row_bytes);
306 }
Ethan Yonker871b07f2016-02-01 10:31:59 -0600307#else
308 int gr_active_fb = 0;
309 if (double_buffered)
310 gr_active_fb = 1-displayed_buffer;
311
that506fc802016-02-09 01:42:08 +0100312 /* flip buffer 180 degrees for devices with physically inverted screens */
313 unsigned int row_pixels = gr_draw->row_bytes / gr_framebuffer[0].pixel_bytes;
314 if (gr_framebuffer[0].pixel_bytes == 4) {
315 for (unsigned int y = 0; y < gr_draw->height; ++y) {
316 uint32_t* dst = reinterpret_cast<uint32_t*>(gr_framebuffer[gr_active_fb].data) + y * row_pixels;
317 uint32_t* src = reinterpret_cast<uint32_t*>(gr_draw->data) + (gr_draw->height - y - 1) * row_pixels + gr_draw->width;
318 for (unsigned int x = 0; x < gr_draw->width; ++x)
319 *(dst++) = *(--src);
320 }
321 } else {
322 for (unsigned int y = 0; y < gr_draw->height; ++y) {
323 uint16_t* dst = reinterpret_cast<uint16_t*>(gr_framebuffer[gr_active_fb].data) + y * row_pixels;
324 uint16_t* src = reinterpret_cast<uint16_t*>(gr_draw->data) + (gr_draw->height - y - 1) * row_pixels + gr_draw->width;
325 for (unsigned int x = 0; x < gr_draw->width; ++x)
326 *(dst++) = *(--src);
Ethan Yonker871b07f2016-02-01 10:31:59 -0600327 }
328 }
that506fc802016-02-09 01:42:08 +0100329
Ethan Yonker871b07f2016-02-01 10:31:59 -0600330 if (double_buffered)
331 set_displayed_framebuffer(1-displayed_buffer);
332#endif
Ethan Yonkerfbb43532015-12-28 21:54:50 +0100333 return gr_draw;
334}
335
336static void fbdev_exit(minui_backend* backend __unused) {
337 close(fb_fd);
338 fb_fd = -1;
339
340 if (gr_draw) {
341 free(gr_draw->data);
342 free(gr_draw);
343 }
344 gr_draw = NULL;
345 munmap(gr_framebuffer[0].data, smem_len);
346}