patch-2.3.34 linux/drivers/i2c/i2c-elv.c

• Lines: 237
• Date: Thu Dec 16 13:59:38 1999
• Orig file: v2.3.33/linux/drivers/i2c/i2c-elv.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.33/linux/drivers/i2c/i2c-elv.c linux/drivers/i2c/i2c-elv.c
@@ -0,0 +1,236 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-elv.c i2c-hw access for philips style parallel port adapters	     */
+/* ------------------------------------------------------------------------- */
+/*   Copyright (C) 1995-99 Simon G. Vogl
+
+    This program 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 of the License, or
+    (at your option) any later version.
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.		     */
+/* ------------------------------------------------------------------------- 
+static char rcsid[] = "$Id: i2c-elv.c,v 1.11 1999/10/08 14:25:11 frodo Exp $";
+   ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
+   Frodo Looijaard <frodol@dds.nl> */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/malloc.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= 0x020135
+#include <linux/init.h>
+#else
+#define __init 
+#endif
+
+/* 2.0.0 kernel compatibility */
+#if LINUX_VERSION_CODE < 0x020100
+#define MODULE_AUTHOR(noone)
+#define MODULE_DESCRIPTION(none)
+#define MODULE_PARM(no,param)
+#define MODULE_PARM_DESC(no,description)
+#define EXPORT_SYMBOL(noexport)
+#define EXPORT_NO_SYMBOLS
+#endif
+
+#if LINUX_VERSION_CODE >= 0x020100
+#  include <asm/uaccess.h>
+#else
+#  include <asm/segment.h>
+#endif
+
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#define DEFAULT_BASE 0x378
+static int base=0;
+static unsigned char PortData = 0;
+
+/* ----- global defines -----------------------------------------------	*/
+#define DEB(x)		/* should be reasonable open, close &c. 	*/
+#define DEB2(x) 	/* low level debugging - very slow 		*/
+#define DEBE(x)	x	/* error messages 				*/
+#define DEBINIT(x) x	/* detection status messages			*/
+
+/* --- Convenience defines for the parallel port:                       */
+#define BASE    (unsigned int)(data)
+#define DATA    BASE                    /* Centronics data port         */
+#define STAT    (BASE+1)                /* Centronics status port       */
+#define CTRL    (BASE+2)                /* Centronics control port      */
+
+
+/* ----- local functions ----------------------------------------------	*/
+
+
+static void bit_elv_setscl(void *data, int state)
+{
+	if (state) {
+		PortData &= 0xfe;
+	} else {
+		PortData |=1;
+	}
+	outb(PortData, DATA);
+}
+
+static void bit_elv_setsda(void *data, int state)
+{
+	if (state) {
+		PortData &=0xfd;
+	} else {
+		PortData |=2;
+	}
+	outb(PortData, DATA);
+} 
+
+static int bit_elv_getscl(void *data)
+{
+	return ( 0 == ( (inb_p(STAT)) & 0x08 ) );
+}
+
+static int bit_elv_getsda(void *data)
+{
+	return ( 0 == ( (inb_p(STAT)) & 0x40 ) );
+}
+
+static int bit_elv_init(void)
+{
+	if (check_region(base,(base == 0x3bc)? 3 : 8) < 0 ) {
+		return -ENODEV;	
+	} else {
+						/* test for ELV adap. 	*/
+		if (inb(base+1) & 0x80) {	/* BUSY should be high	*/
+			DEBINIT(printk("i2c-elv.o: Busy was low.\n"));
+			return -ENODEV;
+		} else {
+			outb(0x0c,base+2);	/* SLCT auf low		*/
+			udelay(400);
+			if ( !(inb(base+1) && 0x10) ) {
+				outb(0x04,base+2);
+				DEBINIT(printk("i2c-elv.o: Select was high.\n"));
+				return -ENODEV;
+			}
+		}
+		request_region(base,(base == 0x3bc)? 3 : 8,
+			"i2c (ELV adapter)");
+		PortData = 0;
+                bit_elv_setsda((void*)base,1);
+                bit_elv_setscl((void*)base,1);
+	}
+	return 0;
+}
+
+static void bit_elv_exit(void)
+{
+	release_region( base , (base == 0x3bc)? 3 : 8 );
+}
+
+static int bit_elv_reg(struct i2c_client *client)
+{
+        return 0;
+}
+
+static int bit_elv_unreg(struct i2c_client *client)
+{
+	return 0;
+}
+
+static void bit_elv_inc_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+  MOD_INC_USE_COUNT;
+#endif
+}
+
+static void bit_elv_dec_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+  MOD_DEC_USE_COUNT;
+#endif
+}
+
+/* ------------------------------------------------------------------------
+ * Encapsulate the above functions in the correct operations structure.
+ * This is only done when more than one hardware adapter is supported.
+ */
+static struct i2c_algo_bit_data bit_elv_data = {
+	NULL,
+	bit_elv_setsda,
+	bit_elv_setscl,
+	bit_elv_getsda,
+	bit_elv_getscl,
+	80, 80, 100,		/*      waits, timeout */
+};
+
+static struct i2c_adapter bit_elv_ops = {
+	"ELV Parallel port adaptor",
+	I2C_HW_B_ELV,
+	NULL,
+	&bit_elv_data,
+	bit_elv_inc_use,
+	bit_elv_dec_use,
+	bit_elv_reg,
+	bit_elv_unreg,	
+};
+
+int  __init i2c_bitelv_init(void)
+{
+	printk("i2c-elv.o: i2c ELV parallel port adapter module\n");
+        if (base==0) {
+                /* probe some values */
+                base=DEFAULT_BASE;
+                bit_elv_data.data=(void*)DEFAULT_BASE;
+                if (bit_elv_init()==0) {
+                        if(i2c_bit_add_bus(&bit_elv_ops) < 0)
+				return -ENODEV;
+                } else {
+                        return -ENODEV;
+                }
+        } else {
+                bit_elv_ops.data=(void*)base;
+                if (bit_elv_init()==0) {
+                        if(i2c_bit_add_bus(&bit_elv_ops) < 0)
+				return -ENODEV;
+                } else {
+                        return -ENODEV;
+                }
+        }
+        printk("i2c-elv.o: found device at %#x.\n",base);
+        return 0;
+}
+
+
+EXPORT_NO_SYMBOLS;
+
+#ifdef MODULE
+MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for ELV parallel port adapter")
+;
+
+MODULE_PARM(base, "i");
+
+int init_module(void)
+{
+        return i2c_bitelv_init();
+}
+
+void cleanup_module(void)
+{
+        i2c_bit_del_bus(&bit_elv_ops);
+        bit_elv_exit();
+}
+
+#endif