/* $Id$ * $URL$ * * driver for the LCD-Linux HD44780 kernel driver * http://lcd-linux.sourceforge.net * * Copyright (C) 2005 Michael Reinelt * Copyright (C) 2005 The LCD4Linux Team * * This file is part of LCD4Linux. * * LCD4Linux is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA. * */ /* * * exported fuctions: * * struct DRIVER drv_LCDLinux * */ #include "config.h" #include #include #include #include #include #include #include #include #include #include "debug.h" #include "cfg.h" #include "qprintf.h" #include "plugin.h" #include "widget.h" #include "widget_text.h" #include "widget_icon.h" #include "widget_bar.h" #include "drv.h" #include "drv_generic_text.h" #define LCD_LINUX_MAIN #include #include static char Name[] = "LCD-Linux"; static char Device[] = "/dev/lcd"; static int lcdlinux_fd = -1; /****************************************/ /*** hardware dependant functions ***/ /****************************************/ static void drv_LL_send(const char *string, const int len) { int run, ret; for (run = 0; run < 10; run++) { ret = write(lcdlinux_fd, string, len); if (ret >= 0 || errno != EAGAIN) break; if (run > 0) info("%s: write(%s): EAGAIN #%d", Name, Device, run); usleep(1000); } if (ret < 0) { error("%s: write(%s) failed: %s", Name, Device, strerror(errno)); } else if (ret != len) { error("%s: partial write(%s): len=%d ret=%d", Name, Device, len, ret); } return; } static void drv_LL_clear(void) { /* No return value check since this ioctl cannot fail */ ioctl(lcdlinux_fd, LCDL_CLEAR_DISP); } static void drv_LL_write(const int row, const int col, const char *data, int len) { int pos = row * DCOLS + col; if (lseek(lcdlinux_fd, pos, SEEK_SET) == (off_t) - 1) { error("%s: lseek(%s) failed: %s", Name, Device, strerror(errno)); } drv_LL_send(data, len); } static void drv_LL_defchar(const int ascii, const unsigned char *matrix) { char buf[9]; int i; buf[0] = ascii; for (i = 1; i < 9; i++) { buf[i] = *matrix++ & 0x1f; } if (ioctl(lcdlinux_fd, LCDL_SET_CGRAM_CHAR, &buf) != 0) { error("%s: ioctl(LCDL_SET_CGRAM_CHAR) failed: %s", Name, strerror(errno)); } } static int drv_LL_start(const char *section, const int quiet) { char *s; int rows = -1, cols = -1; int use_busy = 0, bus4bits = 0, commit = 0; struct lcd_parameters buf; /* emit version information */ info("%s: Version %s", Name, LCD_LINUX_VERSION); /* get size from config file */ s = cfg_get(section, "Size", NULL); if (s != NULL || *s != '\0') { if (sscanf(s, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) { error("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source()); free(s); return -1; } } free(s); /* open device */ lcdlinux_fd = open(Device, O_WRONLY); if (lcdlinux_fd == -1) { error("%s: open(%s) failed: %s", Name, Device, strerror(errno)); return -1; } /* get display size */ memset(&buf, 0, sizeof(buf)); if (ioctl(lcdlinux_fd, LCDL_GET_PARAM, &buf) != 0) { error("%s: ioctl(LCDL_GET_PARAM) failed: %s", Name, strerror(errno)); error("%s: Could not query display information!", Name); return -1; } info("%s: %dx%d display with %d controllers, flags=0x%02lx:", Name, buf.cntr_cols, buf.cntr_rows * buf.num_cntr, buf.num_cntr, buf.flags); info("%s: busy-flag checking %sabled", Name, (buf.flags & HD44780_CHECK_BF) ? "en" : "dis"); info("%s: bus width %d bits", Name, (buf.flags & HD44780_4BITS_BUS) ? 4 : 8); info("%s: font size %s", Name, (buf.flags & HD44780_5X10_FONT) ? "5x10" : "5x8"); /* overwrite width size from lcd4linux.conf */ if (buf.vs_rows || buf.vs_cols) { info("%s: disabling virtual screen", Name); buf.vs_rows = 0; buf.vs_cols = 0; commit = 1; } if ((rows > 0 && rows != buf.cntr_rows * buf.num_cntr) || (cols > 0 && cols != buf.cntr_cols)) { info("%s: changing size to %dx%d", Name, cols, rows); buf.cntr_rows = rows / buf.num_cntr; buf.cntr_cols = cols; commit = 1; } DROWS = buf.cntr_rows * buf.num_cntr; DCOLS = buf.cntr_cols; /* overwrite busy-flag checking from lcd4linux.conf */ cfg_number(section, "UseBusy", 0, 0, 1, &use_busy); if (use_busy && !(buf.flags & HD44780_CHECK_BF)) { info("%s: activating busy-flag checking", Name); buf.flags |= HD44780_CHECK_BF; commit = 1; } else if (!use_busy && (buf.flags & HD44780_CHECK_BF)) { info("%s: deactivating busy-flag checking", Name); buf.flags &= ~HD44780_CHECK_BF; commit = 1; } /* overwrite bus length from lcd4linux.conf */ cfg_number(section, "Bus4Bit", 0, 0, 1, &bus4bits); if (bus4bits && !(buf.flags & HD44780_4BITS_BUS)) { info("%s: setting bus length to 4 bits", Name); buf.flags |= HD44780_4BITS_BUS; commit = 1; } else if (!bus4bits && (buf.flags & HD44780_4BITS_BUS)) { info("%s: setting bus length to 8 bits", Name); buf.flags &= ~HD44780_4BITS_BUS; commit = 1; } if (commit && ioctl(lcdlinux_fd, LCDL_SET_PARAM, &buf) != 0) { error("%s: ioctl(LCDL_SET_PARAM) failed: %s", Name, strerror(errno)); return -1; } /* initialize display */ drv_LL_clear(); /* clear display */ /* Disable control characters interpretation. */ /* No return value check since this ioctl cannot fail */ ioctl(lcdlinux_fd, LCDL_RAW_MODE, 1); if (!quiet) { char buffer[40]; qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS); if (drv_generic_text_greet(buffer, "lcd-linux.sf.net")) { sleep(3); drv_LL_clear(); } } return 0; } /****************************************/ /*** plugins ***/ /****************************************/ /* none */ /****************************************/ /*** widget callbacks ***/ /****************************************/ /* using drv_generic_text_draw(W) */ /* using drv_generic_text_icon_draw(W) */ /* using drv_generic_text_bar_draw(W) */ /****************************************/ /*** exported functions ***/ /****************************************/ /* list models */ int drv_LL_list(void) { printf("generic"); return 0; } /* initialize driver & display */ int drv_LL_init(const char *section, const int quiet) { WIDGET_CLASS wc; int asc255bug; int ret; info("%s: %s", Name, "$Rev$"); /* display preferences */ XRES = 5; /* pixel width of one char */ YRES = 8; /* pixel height of one char */ CHARS = 8; /* number of user-defineable characters */ CHAR0 = 0; /* ASCII of first user-defineable char */ GOTO_COST = -1; /* number of bytes a goto command requires */ /* real worker functions */ drv_generic_text_real_write = drv_LL_write; drv_generic_text_real_defchar = drv_LL_defchar; /* start display */ if ((ret = drv_LL_start(section, quiet)) != 0) return ret; /* initialize generic text driver */ if ((ret = drv_generic_text_init(section, Name)) != 0) return ret; /* initialize generic icon driver */ if ((ret = drv_generic_text_icon_init()) != 0) return ret; /* initialize generic bar driver */ if ((ret = drv_generic_text_bar_init(0)) != 0) return ret; /* add fixed chars to the bar driver */ /* most displays have a full block on ascii 255, but some have kind of */ /* an 'inverted P'. If you specify 'asc255bug 1 in the config, this */ /* char will not be used, but rendered by the bar driver */ cfg_number(section, "asc255bug", 0, 0, 1, &asc255bug); drv_generic_text_bar_add_segment(0, 0, 255, 32); /* ASCII 32 = blank */ if (!asc255bug) drv_generic_text_bar_add_segment(255, 255, 255, 255); /* ASCII 255 = block */ /* register text widget */ wc = Widget_Text; wc.draw = drv_generic_text_draw; widget_register(&wc); /* register icon widget */ wc = Widget_Icon; wc.draw = drv_generic_text_icon_draw; widget_register(&wc); /* register bar widget */ wc = Widget_Bar; wc.draw = drv_generic_text_bar_draw; widget_register(&wc); /* register plugins */ /* none */ return 0; } /* close driver & display */ int drv_LL_quit(const int quiet) { info("%s: shutting down.", Name); drv_generic_text_quit(); /* clear display */ drv_LL_clear(); /* say goodbye... */ if (!quiet) { drv_generic_text_greet("goodbye!", NULL); } /* Enable control characters interpretation. */ /* No return value check since this ioctl cannot fail */ ioctl(lcdlinux_fd, LCDL_RAW_MODE, 0); /* close device */ close(lcdlinux_fd); return (0); } DRIVER drv_LCDLinux = { .name = Name, .list = drv_LL_list, .init = drv_LL_init, .quit = drv_LL_quit, }; href='#n213'>213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247