patch-2.4.0-test7 linux/drivers/char/i2c-parport.c

• Lines: 148
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.0-test6/linux/drivers/char/i2c-parport.c
• Orig date: Fri Jul 14 12:12:09 2000

diff -u --recursive --new-file v2.4.0-test6/linux/drivers/char/i2c-parport.c linux/drivers/char/i2c-parport.c
@@ -1,147 +0,0 @@
-/*
- * I2C driver for parallel port
- *
- * Author: Phil Blundell <philb@gnu.org>
- *
- * 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 driver implements a simple I2C protocol by bit-twiddling some
- * signals on the parallel port.  Since the outputs on the parallel port
- * aren't open collector, three lines rather than two are used:
- *
- *	D0	clock out
- *	D1	data out
- *	BUSY	data in	
- */
-
-#include <linux/parport.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/i2c-old.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-
-#define I2C_DELAY   10
-
-static int debug = 0;
-
-struct parport_i2c_bus
-{
-  struct i2c_bus i2c;
-  struct parport_i2c_bus *next;
-};
-
-static struct parport_i2c_bus *bus_list;
-
-static spinlock_t bus_list_lock = SPIN_LOCK_UNLOCKED;
-
-/* software I2C functions */
-
-static void i2c_setlines(struct i2c_bus *bus, int clk, int data)
-{
-  struct parport *p = bus->data;
-  parport_write_data(p, (clk?1:0) | (data?2:0)); 
-  udelay(I2C_DELAY);
-}
-
-static int i2c_getdataline(struct i2c_bus *bus)
-{
-  struct parport *p = bus->data;
-  return (parport_read_status(p) & PARPORT_STATUS_BUSY) ? 0 : 1;
-}
-
-static struct i2c_bus parport_i2c_bus_template = 
-{
-  "...",
-  I2C_BUSID_PARPORT,
-  NULL,
-  
-  SPIN_LOCK_UNLOCKED,
-  
-  NULL,
-  NULL,
-	
-  i2c_setlines,
-  i2c_getdataline,
-  NULL,
-  NULL,
-};
-
-static void i2c_parport_attach(struct parport *port)
-{
-  struct parport_i2c_bus *b = kmalloc(sizeof(struct parport_i2c_bus), 
-				      GFP_KERNEL);
-  b->i2c = parport_i2c_bus_template;
-  b->i2c.data = parport_get_port (port);
-  strncpy(b->i2c.name, port->name, 32);
-  spin_lock(&bus_list_lock);
-  b->next = bus_list;
-  bus_list = b;
-  spin_unlock(&bus_list_lock);
-  i2c_register_bus(&b->i2c);
-  if (debug)
-    printk(KERN_DEBUG "i2c: attached to %s\n", port->name);
-}
-
-static void i2c_parport_detach(struct parport *port)
-{
-  struct parport_i2c_bus *b, *old_b = NULL;
-  spin_lock(&bus_list_lock);
-  b = bus_list;
-  while (b)
-  {
-    if (b->i2c.data == port)
-    {
-      if (old_b)
-	old_b->next = b->next;
-      else
-	bus_list = b->next;
-      i2c_unregister_bus(&b->i2c);
-      kfree(b);
-      break;
-    }
-    old_b = b;
-    b = b->next;
-  }
-  spin_unlock(&bus_list_lock);
-  if (debug)
-    printk(KERN_DEBUG "i2c: detached from %s\n", port->name);
-}
-
-static struct parport_driver parport_i2c_driver = 
-{
-  "i2c",
-  i2c_parport_attach,
-  i2c_parport_detach
-};
-
-#ifdef MODULE
-int init_module(void)
-#else
-int __init i2c_parport_init(void)
-#endif
-{
-  printk("I2C: driver for parallel port v0.1 philb@gnu.org\n");
-  parport_register_driver(&parport_i2c_driver);
-  return 0;
-}
-
-#ifdef MODULE
-MODULE_PARM(debug, "i");
-
-void cleanup_module(void)
-{
-  struct parport_i2c_bus *b = bus_list;
-  while (b)
-  {
-    struct parport_i2c_bus *next = b->next;
-    i2c_unregister_bus(&b->i2c);
-    kfree(b);
-    b = next;
-  }
-  parport_unregister_driver(&parport_i2c_driver);
-}
-#endif