[patch 3/3] 2.5.36 i2c new adapter i2c-pport driver

[patch 3/3] 2.5.36 i2c new adapter i2c-pport driver

[Albert Cranford]

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Hello Linus,
Patch adds new i2c adapter parallel port driver.
Albert
-- 
ac9410@attbi.com

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--- /dev/null	1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-pport.c	2002-09-17 09:04:39.000000000 -0400
@@ -0,0 +1,236 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-pport.c i2c-hw access  for primitive i2c par. port adapter	     */
+/* ------------------------------------------------------------------------- */
+/*   Copyright (C) 2001    Daniel Smolik
+
+    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.		     */
+/* ------------------------------------------------------------------------- */
+
+/*
+	See doc/i2c-pport for instructions on wiring to the
+	parallel port connector.
+
+	Cut & paste :-)  based on Velleman K9000 driver by Simon G. Vogl
+*/
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+MODULE_LICENSE("GPL");
+
+#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	*/
+
+/* we will use SDA  - Auto Linefeed(14)   bit 1  POUT   */
+/* we will use SCL - Initialize printer(16)    BUSY bit 2*/
+
+#define  SET_SCL    | 0x04
+#define  CLR_SCL    & 0xFB
+
+
+
+
+#define  SET_SDA    & 0x04
+#define  CLR_SDA    | 0x02
+
+
+/* ----- local functions ----------------------------------------------	*/
+
+
+static void bit_pport_setscl(void *data, int state)
+{
+	if (state) {
+		//high
+		PortData = PortData SET_SCL;
+	} else {
+		//low
+		PortData = PortData CLR_SCL; 
+	}
+	outb(PortData, CTRL);
+}
+
+static void bit_pport_setsda(void *data, int state)
+{
+	if (state) {
+		
+		PortData = PortData SET_SDA;
+	} else {
+
+		PortData = PortData CLR_SDA;
+	}
+	outb(PortData, CTRL);
+} 
+
+static int bit_pport_getscl(void *data)
+{
+
+	return ( 4 == ( (inb_p(CTRL)) & 0x04 ) );
+}
+
+static int bit_pport_getsda(void *data)
+{
+	return ( 0 == ( (inb_p(CTRL)) & 0x02 ) );
+}
+
+static int bit_pport_init(void)
+{
+	if (!request_region((base+2),1, "i2c (PPORT adapter)")) {
+		return -ENODEV;	
+	} else {
+
+		/* test for PPORT adap. 	*/
+	
+
+		PortData=inb(base+2);
+		PortData= (PortData SET_SDA) SET_SCL;
+		outb(PortData,base+2);				
+
+		if (!(inb(base+2) | 0x06)) {	/* SDA and SCL will be high	*/
+			DEBINIT(printk("i2c-pport.o: SDA and SCL was low.\n"));
+			return -ENODEV;
+		} else {
+		
+			/*SCL high and SDA low*/
+			PortData = PortData SET_SCL CLR_SDA;
+			outb(PortData,base+2);	
+			udelay(400);
+			if ( !(inb(base+2) | 0x4) ) {
+				//outb(0x04,base+2);
+				DEBINIT(printk("i2c-port.o: SDA was high.\n"));
+				return -ENODEV;
+			}
+		}
+		bit_pport_setsda((void*)base,1);
+		bit_pport_setscl((void*)base,1);
+	}
+	return 0;
+}
+
+static int bit_pport_reg(struct i2c_client *client)
+{
+	return 0;
+}
+
+static int bit_pport_unreg(struct i2c_client *client)
+{
+	release_region((base+2),1);
+	return 0;
+}
+
+static void bit_pport_inc_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif
+}
+
+static void bit_pport_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_pport_data = {
+	NULL,
+	bit_pport_setsda,
+	bit_pport_setscl,
+	bit_pport_getsda,
+	bit_pport_getscl,
+	//NULL,
+	40, 80, 100,		/*	waits, timeout */
+};
+
+static struct i2c_adapter bit_pport_ops = {
+	"Primitive Parallel port adaptor",
+	I2C_HW_B_PPORT,
+	NULL,
+	&bit_pport_data,
+	bit_pport_inc_use,
+	bit_pport_dec_use,
+	bit_pport_reg,
+	bit_pport_unreg,	
+};
+
+int __init i2c_bitpport_init(void)
+{
+	printk("i2c-pport.o: i2c Primitive parallel port adapter module version %s (%s)\n", I2C_VERSION, I2C_DATE);
+
+	if (base==0) {
+		/* probe some values */
+		base=DEFAULT_BASE;
+		bit_pport_data.data=(void*)DEFAULT_BASE;
+		if (bit_pport_init()==0) {
+			if(i2c_bit_add_bus(&bit_pport_ops) < 0)
+				return -ENODEV;
+		} else {
+			return -ENODEV;
+		}
+	} else {
+		bit_pport_data.data=(void*)base;
+		if (bit_pport_init()==0) {
+			if(i2c_bit_add_bus(&bit_pport_ops) < 0)
+				return -ENODEV;
+		} else {
+			return -ENODEV;
+		}
+	}
+	printk("i2c-pport.o: found device at %#x.\n",base);
+	return 0;
+}
+
+
+static void __exit i2c_bitpport_exit(void)
+{
+	i2c_bit_del_bus(&bit_pport_ops);
+	release_region((base+2),1);
+}
+
+EXPORT_NO_SYMBOLS;
+MODULE_AUTHOR("Daniel Smolik <marvin@sitour.cz>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for Primitive parallel port adapter")
+;
+MODULE_PARM(base, "i");
+
+module_init(i2c_bitpport_init);
+module_exit(i2c_bitpport_exit);

Re: [patch 3/3] 2.5.36 i2c new adapter i2c-pport driver

[Jeff Garzik]

Albert Cranford wrote:
> +static int bit_pport_init(void)
> +{
> +	if (!request_region((base+2),1, "i2c (PPORT adapter)")) {
> +		return -ENODEV;	
> +	} else {
> +
> +		/* test for PPORT adap. 	*/
> +	
> +
> +		PortData=inb(base+2);
> +		PortData= (PortData SET_SDA) SET_SCL;
> +		outb(PortData,base+2);				
> +
> +		if (!(inb(base+2) | 0x06)) {	/* SDA and SCL will be high	*/
> +			DEBINIT(printk("i2c-pport.o: SDA and SCL was low.\n"));
> +			return -ENODEV;
> +		} else {
> +		
> +			/*SCL high and SDA low*/
> +			PortData = PortData SET_SCL CLR_SDA;
> +			outb(PortData,base+2);	
> +			udelay(400);


use schedule_timeout() instead of udelay() since you're in process 
context.  otherwise, looks ok...