diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2000-02-05 06:47:02 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2000-02-05 06:47:02 +0000 |
commit | 99a7e12f34b3661a0d1354eef83a0eef4df5e34c (patch) | |
tree | 3560aca9ca86792f9ab7bd87861ea143a1b3c7a3 /drivers/i2c/i2c-velleman.c | |
parent | e73a04659c0b8cdee4dd40e58630e2cf63afb316 (diff) |
Merge with Linux 2.3.38.
Diffstat (limited to 'drivers/i2c/i2c-velleman.c')
-rw-r--r-- | drivers/i2c/i2c-velleman.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-velleman.c b/drivers/i2c/i2c-velleman.c new file mode 100644 index 000000000..7a3bc3522 --- /dev/null +++ b/drivers/i2c/i2c-velleman.c @@ -0,0 +1,219 @@ +/* ------------------------------------------------------------------------- */ +/* i2c-velleman.c i2c-hw access for Velleman K9000 adapters */ +/* ------------------------------------------------------------------------- */ +/* Copyright (C) 1995-96 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. */ +/* ------------------------------------------------------------------------- + +/* $Id: i2c-velleman.c,v 1.14 1999/12/21 23:45:58 frodo Exp $ */ + +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/module.h> +#if LINUX_VERSION_CODE >= 0x020135 +#include <linux/init.h> +#else +#define __init +#endif +#include <linux/string.h> /* for 2.0 kernels to get NULL */ +#include <asm/errno.h> /* for 2.0 kernels to get ENODEV */ +#include <asm/io.h> + +/* 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 + +#include <linux/i2c.h> +#include <linux/i2c-algo-bit.h> + +/* ----- 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 */ + + /* Pin Port Inverted name */ +#define I2C_SDA 0x02 /* ctrl bit 1 (inv) */ +#define I2C_SCL 0x08 /* ctrl bit 3 (inv) */ + +#define I2C_SDAIN 0x10 /* stat bit 4 */ +#define I2C_SCLIN 0x08 /* ctrl bit 3 (inv) (reads own output) */ + +#define I2C_DMASK 0xfd +#define I2C_CMASK 0xf7 + + +/* --- 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 */ + +#define DEFAULT_BASE 0x378 +static int base=0; + +/* ----- local functions --------------------------------------------------- */ + +static void bit_velle_setscl(void *data, int state) +{ + if (state) { + outb(inb(CTRL) & I2C_CMASK, CTRL); + } else { + outb(inb(CTRL) | I2C_SCL, CTRL); + } + +} + +static void bit_velle_setsda(void *data, int state) +{ + if (state) { + outb(inb(CTRL) & I2C_DMASK , CTRL); + } else { + outb(inb(CTRL) | I2C_SDA, CTRL); + } + +} + +static int bit_velle_getscl(void *data) +{ + return ( 0 == ( (inb(CTRL)) & I2C_SCLIN ) ); +} + +static int bit_velle_getsda(void *data) +{ + return ( 0 != ( (inb(STAT)) & I2C_SDAIN ) ); +} + +static int bit_velle_init(void) +{ + if (check_region(base,(base == 0x3bc)? 3 : 8) < 0 ) { + DEBE(printk("i2c-velleman.o: Port %#x already in use.\n", base)); + return -ENODEV; + } else { + request_region(base, (base == 0x3bc)? 3 : 8, + "i2c (Vellemann adapter)"); + bit_velle_setsda((void*)base,1); + bit_velle_setscl((void*)base,1); + } + return 0; +} + +static void bit_velle_exit(void) +{ + release_region( base , (base == 0x3bc)? 3 : 8 ); +} + + +static int bit_velle_reg(struct i2c_client *client) +{ + return 0; +} + +static int bit_velle_unreg(struct i2c_client *client) +{ + return 0; +} + +static void bit_velle_inc_use(struct i2c_adapter *adap) +{ +#ifdef MODULE + MOD_INC_USE_COUNT; +#endif +} + +static void bit_velle_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_velle_data = { + NULL, + bit_velle_setsda, + bit_velle_setscl, + bit_velle_getsda, + bit_velle_getscl, + 10, 10, 100, /* waits, timeout */ +}; + +static struct i2c_adapter bit_velle_ops = { + "Velleman K8000", + I2C_HW_B_VELLE, + NULL, + &bit_velle_data, + bit_velle_inc_use, + bit_velle_dec_use, + bit_velle_reg, + bit_velle_unreg, +}; + +int __init i2c_bitvelle_init(void) +{ + printk("i2c-velleman.o: i2c Velleman K8000 adapter module\n"); + if (base==0) { + /* probe some values */ + base=DEFAULT_BASE; + bit_velle_data.data=(void*)DEFAULT_BASE; + if (bit_velle_init()==0) { + if(i2c_bit_add_bus(&bit_velle_ops) < 0) + return -ENODEV; + } else { + return -ENODEV; + } + } else { + bit_velle_data.data=(void*)base; + if (bit_velle_init()==0) { + if(i2c_bit_add_bus(&bit_velle_ops) < 0) + return -ENODEV; + } else { + return -ENODEV; + } + } + printk("i2c-velleman.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 Velleman K8000 adapter"); + +MODULE_PARM(base, "i"); + +int init_module(void) +{ + return i2c_bitvelle_init(); +} + +void cleanup_module(void) +{ + i2c_bit_del_bus(&bit_velle_ops); + bit_velle_exit(); +} + +#endif |