/* * Filename: cfag12864b-example.c * Version: 0.1.0 * Description: cfag12864b LCD userspace example program * License: GPLv2 * * Author: Copyright (C) Miguel Ojeda Sandonis * Date: 2006-10-31 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ /* * ------------------------ * start of cfag12864b code * ------------------------ */ #include #include #include #include #include #include #define CFAG12864B_WIDTH (128) #define CFAG12864B_HEIGHT (64) #define CFAG12864B_SIZE (128 * 64 / 8) #define CFAG12864B_BPB (8) #define CFAG12864B_ADDRESS(x, y) ((y) * CFAG12864B_WIDTH / \ CFAG12864B_BPB + (x) / CFAG12864B_BPB) #define CFAG12864B_BIT(n) (((unsigned char) 1) << (n)) #undef CFAG12864B_DOCHECK #ifdef CFAG12864B_DOCHECK #define CFAG12864B_CHECK(x, y) ((x) < CFAG12864B_WIDTH && \ (y) < CFAG12864B_HEIGHT) #else #define CFAG12864B_CHECK(x, y) (1) #endif int cfag12864b_fd; unsigned char * cfag12864b_mem; unsigned char cfag12864b_buffer[CFAG12864B_SIZE]; /* * init a cfag12864b framebuffer device * * No error: return = 0 * Unable to open: return = -1 * Unable to mmap: return = -2 */ static int cfag12864b_init(char *path) { cfag12864b_fd = open(path, O_RDWR); if (cfag12864b_fd == -1) return -1; cfag12864b_mem = mmap(0, CFAG12864B_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, cfag12864b_fd, 0); if (cfag12864b_mem == MAP_FAILED) { close(cfag12864b_fd); return -2; } return 0; } /* * exit a cfag12864b framebuffer device */ static void cfag12864b_exit(void) { munmap(cfag12864b_mem, CFAG12864B_SIZE); close(cfag12864b_fd); } /* * set (x, y) pixel */ static void cfag12864b_set(unsigned char x, unsigned char y) { if (CFAG12864B_CHECK(x, y)) cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] |= CFAG12864B_BIT(x % CFAG12864B_BPB); } /* * unset (x, y) pixel */ static void cfag12864b_unset(unsigned char x, unsigned char y) { if (CFAG12864B_CHECK(x, y)) cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &= ~CFAG12864B_BIT(x % CFAG12864B_BPB); } /* * is set (x, y) pixel? * * Pixel off: return = 0 * Pixel on: return = 1 */ static unsigned char cfag12864b_isset(unsigned char x, unsigned char y) { if (CFAG12864B_CHECK(x, y)) if (cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] & CFAG12864B_BIT(x % CFAG12864B_BPB)) return 1; return 0; } /* * not (x, y) pixel */ static void cfag12864b_not(unsigned char x, unsigned char y) { if (cfag12864b_isset(x, y)) cfag12864b_unset(x, y); else cfag12864b_set(x, y); } /* * fill (set all pixels) */ static void cfag12864b_fill(void) { unsigned short i; for (i = 0; i < CFAG12864B_SIZE; i++) cfag12864b_buffer[i] = 0xFF; } /* * clear (unset all pixels) */ static void cfag12864b_clear(void) { unsigned short i; for (i = 0; i < CFAG12864B_SIZE; i++) cfag12864b_buffer[i] = 0; } /* * format a [128*64] matrix * * Pixel off: src[i] = 0 * Pixel on: src[i] > 0 */ static void cfag12864b_format(unsigned char * matrix) { unsigned char i, j, n; for (i = 0; i < CFAG12864B_HEIGHT; i++) for (j = 0; j < CFAG12864B_WIDTH / CFAG12864B_BPB; j++) { cfag12864b_buffer[i * CFAG12864B_WIDTH / CFAG12864B_BPB + j] = 0; for (n = 0; n < CFAG12864B_BPB; n++) if (matrix[i * CFAG12864B_WIDTH + j * CFAG12864B_BPB + n]) cfag12864b_buffer[i * CFAG12864B_WIDTH / CFAG12864B_BPB + j] |= CFAG12864B_BIT(n); } } /* * blit buffer to lcd */ static void cfag12864b_blit(void) { memcpy(cfag12864b_mem, cfag12864b_buffer, CFAG12864B_SIZE); } /* * ---------------------- * end of cfag12864b code * ---------------------- */ #include #define EXAMPLES 6 static void example(unsigned char n) { unsigned short i, j; unsigned char matrix[CFAG12864B_WIDTH * CFAG12864B_HEIGHT]; if (n > EXAMPLES) return; printf("Example %i/%i - ", n, EXAMPLES); switch (n) { case 1: printf("Draw points setting bits"); cfag12864b_clear(); for (i = 0; i < CFAG12864B_WIDTH; i += 2) for (j = 0; j < CFAG12864B_HEIGHT; j += 2) cfag12864b_set(i, j); break; case 2: printf("Clear the LCD"); cfag12864b_clear(); break; case 3: printf("Draw rows formatting a [128*64] matrix"); memset(matrix, 0, CFAG12864B_WIDTH * CFAG12864B_HEIGHT); for (i = 0; i < CFAG12864B_WIDTH; i++) for (j = 0; j < CFAG12864B_HEIGHT; j += 2) matrix[j * CFAG12864B_WIDTH + i] = 1; cfag12864b_format(matrix); break; case 4: printf("Fill the lcd"); cfag12864b_fill(); break; case 5: printf("Draw columns unsetting bits"); for (i = 0; i < CFAG12864B_WIDTH; i += 2) for (j = 0; j < CFAG12864B_HEIGHT; j++) cfag12864b_unset(i, j); break; case 6: printf("Do negative not-ing all bits"); for (i = 0; i < CFAG12864B_WIDTH; i++) for (j = 0; j < CFAG12864B_HEIGHT; j ++) cfag12864b_not(i, j); break; } puts(" - [Press Enter]"); } int main(int argc, char *argv[]) { unsigned char n; if (argc != 2) { printf( "Sintax: %s fbdev\n" "Usually: /dev/fb0, /dev/fb1...\n", argv[0]); return -1; } if (cfag12864b_init(argv[1])) { printf("Can't init %s fbdev\n", argv[1]); return -2; } for (n = 1; n <= EXAMPLES; n++) { example(n); cfag12864b_blit(); while (getchar() != '\n'); } cfag12864b_exit(); return 0; } gers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/wireless')