/* ------------------------------------------------------------------------- *//* i2c-philips-par.c i2c-hw access for philips style parallel port adapters  *//* ------------------------------------------------------------------------- *//*   Copyright (C) 1995-2000 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.		     *//* ------------------------------------------------------------------------- */ /* With some changes from Ky鰏ti M鋖kki <kmalkki@cc.hut.fi> and even   Frodo Looijaard <frodol@dds.nl> *//* $Id: i2c-philips-par.c,v 1.2 2004/02/06 13:19:45 laputa Exp $ */#include <linux/kernel.h>#include <linux/ioport.h>#include <linux/module.h>#include <linux/init.h>#include <linux/stddef.h>#include <linux/parport.h>#include <linux/i2c.h>#include <linux/i2c-algo-bit.h>#ifndef __exit#define __exit __init#endifstatic int type;struct i2c_par{	struct pardevice *pdev;	struct i2c_adapter adapter;	struct i2c_algo_bit_data bit_lp_data;	struct i2c_par *next;};static struct i2c_par *adapter_list;/* ----- 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 				*//* ----- printer port defines ------------------------------------------*/					/* Pin Port  Inverted	name	*/#define I2C_ON		0x20		/* 12 status N	paper		*/					/* ... only for phil. not used  */#define I2C_SDA		0x80		/*  9 data   N	data7		*/#define I2C_SCL		0x08		/* 17 ctrl   N	dsel		*/#define I2C_SDAIN	0x80		/* 11 stat   Y	busy		*/#define I2C_SCLIN	0x08		/* 15 stat   Y	enable		*/#define I2C_DMASK	0x7f#define I2C_CMASK	0xf7/* ----- local functions ----------------------------------------------	*/static void bit_lp_setscl(void *data, int state){	/*be cautious about state of the control register - 		touch only the one bit needed*/	if (state) {		parport_write_control((struct parport *) data,		      parport_read_control((struct parport *) data)|I2C_SCL);	} else {		parport_write_control((struct parport *) data,		      parport_read_control((struct parport *) data)&I2C_CMASK);	}}static void bit_lp_setsda(void *data, int state){	if (state) {		parport_write_data((struct parport *) data, I2C_DMASK);	} else {		parport_write_data((struct parport *) data, I2C_SDA);	}}static int bit_lp_getscl(void *data){	return parport_read_status((struct parport *) data) & I2C_SCLIN;}static int bit_lp_getsda(void *data){	return parport_read_status((struct parport *) data) & I2C_SDAIN;}static void bit_lp_setscl2(void *data, int state){	if (state) {		parport_write_data((struct parport *) data,		      parport_read_data((struct parport *) data)|0x1);	} else {		parport_write_data((struct parport *) data,		      parport_read_data((struct parport *) data)&0xfe);	}}static void bit_lp_setsda2(void *data, int state){	if (state) {		parport_write_data((struct parport *) data,		      parport_read_data((struct parport *) data)|0x2);	} else {		parport_write_data((struct parport *) data,		      parport_read_data((struct parport *) data)&0xfd);	}}static int bit_lp_getsda2(void *data){	return (parport_read_status((struct parport *) data) & 			             PARPORT_STATUS_BUSY) ? 0 : 1;}static int bit_lp_reg(struct i2c_client *client){	return 0;}static int bit_lp_unreg(struct i2c_client *client){	return 0;}static void bit_lp_inc_use(struct i2c_adapter *adap){	MOD_INC_USE_COUNT;}static void bit_lp_dec_use(struct i2c_adapter *adap){	MOD_DEC_USE_COUNT;}/* ------------------------------------------------------------------------ * 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_lp_data = {	NULL,	bit_lp_setsda,	bit_lp_setscl,	bit_lp_getsda,	bit_lp_getscl,	80, 80, 100,		/*	waits, timeout */}; static struct i2c_algo_bit_data bit_lp_data2 = {	NULL,	bit_lp_setsda2,	bit_lp_setscl2,	bit_lp_getsda2,	NULL,	80, 80, 100,		/*	waits, timeout */}; static struct i2c_adapter bit_lp_ops = {	"Philips Parallel port adapter",	I2C_HW_B_LP,	NULL,	NULL,	bit_lp_inc_use,	bit_lp_dec_use,	bit_lp_reg,	bit_lp_unreg,};static void i2c_parport_attach (struct parport *port){	struct i2c_par *adapter = kmalloc(sizeof(struct i2c_par),					  GFP_KERNEL);	if (!adapter) {		printk("i2c-philips-par: Unable to malloc.\n");		return;	}	printk("i2c-philips-par.o: attaching to %s\n", port->name);	adapter->pdev = parport_register_device(port, "i2c-philips-par",						NULL, NULL, NULL, 						PARPORT_FLAG_EXCL,						NULL);	if (!adapter->pdev) {		printk("i2c-philips-par: Unable to register with parport.\n");		return;	}	adapter->adapter = bit_lp_ops;	adapter->adapter.algo_data = &adapter->bit_lp_data;	adapter->bit_lp_data = type ? bit_lp_data2 : bit_lp_data;	adapter->bit_lp_data.data = port;	/* reset hardware to sane state */	parport_claim_or_block(adapter->pdev);	bit_lp_setsda(port, 1);	bit_lp_setscl(port, 1);	parport_release(adapter->pdev);	if (i2c_bit_add_bus(&adapter->adapter) < 0)	{		printk("i2c-philips-par: Unable to register with I2C.\n");		parport_unregister_device(adapter->pdev);		kfree(adapter);		return;		/* No good */	}	adapter->next = adapter_list;	adapter_list = adapter;}static void i2c_parport_detach (struct parport *port){	struct i2c_par *adapter, *prev = NULL;	for (adapter = adapter_list; adapter; adapter = adapter->next)	{		if (adapter->pdev->port == port)		{			parport_unregister_device(adapter->pdev);			i2c_bit_del_bus(&adapter->adapter);			if (prev)				prev->next = adapter->next;			else				adapter_list = adapter->next;			kfree(adapter);			return;		}		prev = adapter;	}}#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,4)static struct parport_driver i2c_driver = {	"i2c-philips-par",	i2c_parport_attach,	i2c_parport_detach,	NULL};#endifstatic int __init i2c_bitlp_init(void){#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,4)	struct parport *port;#endif	printk("i2c-philips-par.o: i2c Philips parallel port adapter module\n");#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,4)	parport_register_driver(&i2c_driver);#else	for (port = parport_enumerate(); port; port=port->next)		i2c_parport_attach(port);#endif		return 0;}static void __exit i2c_bitlp_exit(void){#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,4)	parport_unregister_driver(&i2c_driver);#else	struct parport *port;	for (port = parport_enumerate(); port; port=port->next)		i2c_parport_detach(port);#endif}EXPORT_NO_SYMBOLS;MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");MODULE_DESCRIPTION("I2C-Bus adapter routines for Philips parallel port adapter");MODULE_LICENSE("GPL");MODULE_PARM(type, "i");module_init(i2c_bitlp_init);module_exit(i2c_bitlp_exit);