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Subject[patch 2/9]Four new i2c drivers and __init/__exit cleanup to i2c
Hello Linus,
New I2C drivers that have been adjusted after Russell King comments of August.
o i2c-algo-8xx.c
o i2c-pport.c
o i2c-adap-ibm_ocp.c
o i2c-pcf-epp.c
o Add new drivers to Config.in and Makefile.
o Add new drivers to i2c-core for initialization.
o Remove EXPORT_NO_SYMBOLS statement from i2c-dev, i2c-elektor and i2c-frodo.
o Cleanup init_module and cleanup_module adding __init and __exit to most drivers.
o Adjust i2c-elektor with cli/sti replacement.
--
ac9410@attbi.com
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux-2.5.34/drivers/i2c/i2c-pport.c 2001-10-13 14:09:01.000000000 -0400
@@ -0,0 +1,252 @@
+/* ------------------------------------------------------------------------- */
+/* 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>
+
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+
+#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)
+{
+ //release_region( (base+2) ,1);
+
+ if (check_region((base+2),1) < 0 ) {
+ 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;
+ }
+ }
+ request_region((base+2),1,
+ "i2c (PPORT adapter)");
+ bit_pport_setsda((void*)base,1);
+ bit_pport_setscl((void*)base,1);
+ }
+ return 0;
+}
+
+static void __exit bit_pport_exit(void)
+{
+ release_region((base+2),1);
+}
+
+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;
+}
+
+
+#ifdef MODULE
+MODULE_AUTHOR("Daniel Smolik <marvin@sitour.cz>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for Primitive parallel port adapter")
+;
+
+MODULE_PARM(base, "i");
+
+int init_module(void)
+{
+ return i2c_bitpport_init();
+}
+
+void cleanup_module(void)
+{
+ i2c_bit_del_bus(&bit_pport_ops);
+ bit_pport_exit();
+}
+
+#endif
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