diff options
Diffstat (limited to 'drv_LCDLinux.c')
| -rw-r--r-- | drv_LCDLinux.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/drv_LCDLinux.c b/drv_LCDLinux.c new file mode 100644 index 0000000..7f91094 --- /dev/null +++ b/drv_LCDLinux.c @@ -0,0 +1,367 @@ +/* $Id: drv_LCDLinux.c 975 2009-01-18 11:16:20Z michael $ + * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_LCDLinux.c $ + * + * driver for the LCD-Linux HD44780 kernel driver + * http://lcd-linux.sourceforge.net + * + * Copyright (C) 2005 Michael Reinelt <michael@reinelt.co.at> + * Copyright (C) 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * 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 <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> + +#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 <linux/lcd-linux.h> +#include <linux/hd44780.h> + +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("LCD-Linux HD44780 kernel driver"); + 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: 975 $"); + + /* 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, +}; |