driver for picoLCD displays from mini-box.com by Nicu Pavel

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@747 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 512 insertions, 0 deletions

diff --git a/drv_picoLCD.c b/drv_picoLCD.c
new file mode 100644
index 0000000..dafd496
--- /dev/null
+++ b/drv_picoLCD.c
@@ -0,0 +1,512 @@
+/* $Id$
+ * $URL$
+ *
+ * driver for picoLCD displays from mini-box.com
+ *
+ * Copyright (C) 2005 Michael Reinelt <reinelt@eunet.at>
+ * Copyright (C) 2005, 2006, 2007 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * Copyright (C) 2007 Nicu Pavel, Mini-Box.com <npavel@mini-box.com>
+ *
+ * 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_picoLCD
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+
+#ifdef HAVE_USB_H
+#include <usb.h>
+#endif
+
+#include "debug.h"
+#include "cfg.h"
+#include "qprintf.h"
+#include "udelay.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"
+#include "drv_generic_gpio.h"
+#include "drv_generic_keypad.h"
+
+
+
+#define picoLCD_VENDOR  0x04d8
+#define picoLCD_DEVICE  0x0002
+
+static char Name[] = "picoLCD";
+
+static int use_libusb = 1;
+static unsigned int gpo = 0;
+
+static char *Buffer;
+static char *BufPtr;
+
+#ifdef HAVE_USB_H
+
+static usb_dev_handle *lcd;
+static int interface;
+
+extern int usb_debug;
+
+#endif
+
+
+
+/****************************************/
+/***  hardware dependant functions    ***/
+/****************************************/
+
+#ifdef HAVE_USB_H
+
+static int drv_pL_open(void)
+{
+    struct usb_bus *busses, *bus;
+    struct usb_device *dev;
+    char buf[1024];
+    int ret;
+
+    lcd = NULL;
+
+    info("%s: scanning for picoLCD...", Name);
+
+    usb_debug = 0;
+
+    usb_init();
+    usb_find_busses();
+    usb_find_devices();
+    busses = usb_get_busses();
+
+    for (bus = busses; bus; bus = bus->next) {
+	for (dev = bus->devices; dev; dev = dev->next) {
+	    if ((dev->descriptor.idVendor == picoLCD_VENDOR) && (dev->descriptor.idProduct == picoLCD_DEVICE)) {
+
+		info("%s: found picoLCD on bus %s device %s", Name, bus->dirname, dev->filename);
+
+		interface = 0;
+		lcd = usb_open(dev);
+
+		ret = usb_get_driver_np(lcd, 0, buf, sizeof(buf));
+
+		if (ret == 0) {
+		    info("interface 0 already claimed attempting to detach it\n");
+		    ret = usb_detach_kernel_driver_np(lcd, 0);
+		    printf("usb_detach_kernel_driver_np returned %d\n", ret);
+		}
+
+		if (usb_claim_interface(lcd, interface) < 0) {
+		    error("%s: usb_claim_interface() failed!", Name);
+		    return -1;
+		}
+		return 0;
+	    }
+	}
+    }
+    error("%s: could not find a picoLCD", Name);
+    return -1;
+}
+
+
+static int drv_pL_close(void)
+{
+    usb_release_interface(lcd, interface);
+    usb_close(lcd);
+
+    return 0;
+}
+
+#endif
+
+
+static void drv_pL_send(void)
+{
+
+#if 0
+    struct timeval now, end;
+    gettimeofday(&now, NULL);
+#endif
+
+    if (use_libusb) {
+#ifdef HAVE_USB_H
+	usb_bulk_write(lcd, USB_ENDPOINT_OUT + 1, Buffer, BufPtr - Buffer, 1000);
+#endif
+    }
+
+#if 0
+    gettimeofday(&end, NULL);
+    debug("send %d bytes in %d usec (%d usec/byte)", BufPtr - Buffer,
+	  (1000000 * (end.tv_sec - now.tv_sec) + end.tv_usec - now.tv_usec),
+	  (1000000 * (end.tv_sec - now.tv_sec) + end.tv_usec - now.tv_usec) / (BufPtr - Buffer));
+#endif
+
+    BufPtr = Buffer;
+}
+
+
+static void drv_pL_command(const unsigned char cmd)
+{
+    *BufPtr++ = cmd;
+}
+
+
+static void drv_pL_clear(void)
+{
+    drv_pL_command(0x94);	/* clear display */
+    drv_pL_send();		/* flush buffer */
+}
+
+static int drv_pL_contrast(int contrast)
+{
+
+    if (contrast < 0)
+	contrast = 0;
+    if (contrast > 255)
+	contrast = 255;
+
+    drv_pL_command(0x92);
+    drv_pL_command(contrast);
+
+    drv_pL_send();
+
+    return contrast;
+}
+
+
+static int drv_pL_backlight(int backlight)
+{
+    if (backlight < 0)
+	backlight = 0;
+    if (backlight > 1)
+	backlight = 1;
+
+    drv_pL_command(0x91);
+    drv_pL_command(backlight);
+
+    drv_pL_send();
+
+    return backlight;
+}
+
+static int drv_pL_gpo(int num, int val)
+{
+    if (num < 0)
+	num = 0;
+    if (num > 7)
+	num = 7;
+
+    if (val < 0)
+	val = 0;
+    if (val > 1)
+	val = 1;
+
+    /* set led bit to 1 or 0 */
+    if (val)
+	gpo |= 1 << num;
+    else
+	gpo &= ~(1 << num);
+
+    drv_pL_command(0x81);
+    drv_pL_command(gpo);
+
+    return val;
+}
+
+
+static void drv_pL_write(const int row, const int col, const char *data, int len)
+{
+
+    drv_pL_command(0x98);
+    drv_pL_command(row);
+    drv_pL_command(col);
+    drv_pL_command(len);
+
+    while (len--) {
+	if (*data == 0)
+	    *BufPtr++ = 0;
+	*BufPtr++ = *data++;
+    }
+
+    drv_pL_send();
+}
+
+static void drv_pL_defchar(const int ascii, const unsigned char *matrix)
+{
+    int i;
+
+    drv_pL_command(0x9c);
+    drv_pL_command(ascii);
+
+    for (i = 0; i < 8; i++) {
+	if ((*matrix & 0x1f) == 0)
+	    *BufPtr++ = 0;
+	*BufPtr++ = *matrix++ & 0x1f;
+    }
+
+    drv_pL_send();
+}
+
+
+static int drv_pL_start(const char *section, const int quiet)
+{
+    int rows = -1, cols = -1;
+    int value;
+    char *s;
+
+#ifdef HAVE_USB_H
+    use_libusb = 1;
+    debug("using libusb");
+#else
+    error("%s: lcd4linux was compiled without libusb support!", Name);
+    return -1;
+#endif
+
+    s = cfg_get(section, "Size", NULL);
+    if (s == NULL || *s == '\0') {
+	error("%s: no '%s.Size' entry from %s", Name, section, cfg_source());
+	return -1;
+    }
+    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;
+    }
+
+    DROWS = rows;
+    DCOLS = cols;
+
+
+#ifdef HAVE_USB_H
+    if (drv_pL_open() < 0) {
+	return -1;
+    }
+#endif
+
+
+    /* Init the command buffer */
+    Buffer = (char *) malloc(1024);
+    if (Buffer == NULL) {
+	error("%s: coommand buffer could not be allocated: malloc() failed", Name);
+	return -1;
+    }
+    BufPtr = Buffer;
+
+    if (cfg_number(section, "Contrast", 0, 0, 255, &value) > 0) {
+	info("Setting contrast to %d\n", value);
+	drv_pL_contrast(value);
+    }
+
+    if (cfg_number(section, "Backlight", 0, 0, 1, &value) > 0) {
+	info("Setting backlight to %d\n", value);
+	drv_pL_backlight(value);
+    }
+
+    drv_pL_clear();		/* clear display */
+
+    if (!quiet) {
+	char buffer[40];
+	qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
+	if (drv_generic_text_greet(buffer, "http://www.picolcd.com")) {
+	    sleep(3);
+	    drv_pL_clear();
+	}
+    }
+
+    return 0;
+}
+
+
+/****************************************/
+/***            plugins               ***/
+/****************************************/
+
+static void plugin_contrast(RESULT * result, RESULT * arg1)
+{
+    double contrast;
+
+    contrast = drv_pL_contrast(R2N(arg1));
+    SetResult(&result, R_NUMBER, &contrast);
+}
+
+static void plugin_backlight(RESULT * result, RESULT * arg1)
+{
+    double backlight;
+
+    backlight = drv_pL_backlight(R2N(arg1));
+    SetResult(&result, R_NUMBER, &backlight);
+}
+
+static void plugin_gpo(RESULT * result, RESULT * argv[])
+{
+    double gpo;
+    gpo = drv_pL_gpo(R2N(argv[0]), R2N(argv[1]));
+    SetResult(&result, R_NUMBER, &gpo);
+}
+
+
+/****************************************/
+/***        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_pL_list(void)
+{
+    printf("generic");
+    return 0;
+}
+
+
+/* initialize driver & display */
+int drv_pL_init(const char *section, const int quiet)
+{
+    WIDGET_CLASS wc;
+    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 */
+    GPOS = 8;
+    INVALIDATE = 1;
+    GOTO_COST = 2;		/* number of bytes a goto command requires */
+
+    /* real worker functions */
+    drv_generic_text_real_write = drv_pL_write;
+    drv_generic_text_real_defchar = drv_pL_defchar;
+    drv_generic_gpio_real_set = drv_pL_gpo;
+
+    /* start display */
+    if ((ret = drv_pL_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;
+
+    drv_generic_text_bar_add_segment(0, 0, 255, 32);
+
+    /* GPO's init */
+    if ((ret = drv_generic_gpio_init(section, Name)) != 0)
+	return ret;
+
+    /* 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 */
+    AddFunction("LCD::contrast", -1, plugin_contrast);
+    AddFunction("LCD::backlight", -1, plugin_backlight);
+    AddFunction("LCD::gpo", -1, plugin_gpo);
+
+    return 0;
+}
+
+
+/* close driver & display */
+int drv_pL_quit(const int quiet)
+{
+
+    info("%s: shutting down.", Name);
+
+    /* flush buffer */
+    drv_pL_send();
+
+    drv_generic_text_quit();
+
+    /* clear display */
+    drv_pL_clear();
+
+    /* say goodbye... */
+    if (!quiet) {
+	drv_generic_text_greet("goodbye!", NULL);
+    }
+
+    if (use_libusb) {
+#ifdef HAVE_USB_H
+	drv_pL_close();
+#endif
+    }
+
+    if (Buffer) {
+	free(Buffer);
+	Buffer = NULL;
+	BufPtr = Buffer;
+    }
+
+    return (0);
+}
+
+
+DRIVER drv_picoLCD = {
+  name:Name,
+  list:drv_pL_list,
+  init:drv_pL_init,
+  quit:drv_pL_quit,
+};