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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 420 | giacomo | 1 | /* ------------------------------------------------------------------------- */ |
| 2 | /* i2c-velleman.c i2c-hw access for Velleman K9000 adapters */ |
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| 3 | /* ------------------------------------------------------------------------- */ |
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| 4 | /* Copyright (C) 1995-96, 2000 Simon G. Vogl |
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| 5 | |||
| 6 | This program is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2 of the License, or |
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| 9 | (at your option) any later version. |
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| 10 | |||
| 11 | This program is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |||
| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with this program; if not, write to the Free Software |
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| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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| 19 | /* ------------------------------------------------------------------------- */ |
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| 20 | |||
| 21 | /* $Id: i2c-velleman.c,v 1.1 2004-01-28 15:12:07 giacomo Exp $ */ |
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| 22 | |||
| 23 | #include <linux/kernel.h> |
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| 24 | #include <linux/ioport.h> |
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| 25 | #include <linux/module.h> |
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| 26 | #include <linux/init.h> |
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| 27 | #include <linux/delay.h> |
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| 28 | #include <linux/i2c.h> |
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| 29 | #include <linux/i2c-algo-bit.h> |
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| 30 | #include <asm/io.h> |
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| 31 | |||
| 32 | /* ----- global defines ----------------------------------------------- */ |
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| 33 | #define DEB(x) /* should be reasonable open, close &c. */ |
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| 34 | #define DEB2(x) /* low level debugging - very slow */ |
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| 35 | #define DEBE(x) x /* error messages */ |
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| 36 | |||
| 37 | /* Pin Port Inverted name */ |
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| 38 | #define I2C_SDA 0x02 /* ctrl bit 1 (inv) */ |
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| 39 | #define I2C_SCL 0x08 /* ctrl bit 3 (inv) */ |
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| 40 | |||
| 41 | #define I2C_SDAIN 0x10 /* stat bit 4 */ |
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| 42 | #define I2C_SCLIN 0x08 /* ctrl bit 3 (inv)(reads own output)*/ |
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| 43 | |||
| 44 | #define I2C_DMASK 0xfd |
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| 45 | #define I2C_CMASK 0xf7 |
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| 46 | |||
| 47 | |||
| 48 | /* --- Convenience defines for the parallel port: */ |
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| 49 | #define BASE (unsigned int)(data) |
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| 50 | #define DATA BASE /* Centronics data port */ |
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| 51 | #define STAT (BASE+1) /* Centronics status port */ |
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| 52 | #define CTRL (BASE+2) /* Centronics control port */ |
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| 53 | |||
| 54 | #define DEFAULT_BASE 0x378 |
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| 55 | static int base=0; |
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| 56 | |||
| 57 | /* ----- local functions --------------------------------------------------- */ |
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| 58 | |||
| 59 | static void bit_velle_setscl(void *data, int state) |
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| 60 | { |
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| 61 | if (state) { |
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| 62 | outb(inb(CTRL) & I2C_CMASK, CTRL); |
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| 63 | } else { |
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| 64 | outb(inb(CTRL) | I2C_SCL, CTRL); |
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| 65 | } |
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| 66 | |||
| 67 | } |
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| 68 | |||
| 69 | static void bit_velle_setsda(void *data, int state) |
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| 70 | { |
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| 71 | if (state) { |
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| 72 | outb(inb(CTRL) & I2C_DMASK , CTRL); |
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| 73 | } else { |
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| 74 | outb(inb(CTRL) | I2C_SDA, CTRL); |
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| 75 | } |
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| 76 | |||
| 77 | } |
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| 78 | |||
| 79 | static int bit_velle_getscl(void *data) |
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| 80 | { |
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| 81 | return ( 0 == ( (inb(CTRL)) & I2C_SCLIN ) ); |
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| 82 | } |
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| 83 | |||
| 84 | static int bit_velle_getsda(void *data) |
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| 85 | { |
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| 86 | return ( 0 != ( (inb(STAT)) & I2C_SDAIN ) ); |
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| 87 | } |
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| 88 | |||
| 89 | static int bit_velle_init(void) |
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| 90 | { |
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| 91 | if (!request_region(base, (base == 0x3bc) ? 3 : 8, |
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| 92 | "i2c (Vellemann adapter)")) |
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| 93 | return -ENODEV; |
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| 94 | |||
| 95 | bit_velle_setsda((void*)base,1); |
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| 96 | bit_velle_setscl((void*)base,1); |
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| 97 | return 0; |
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| 98 | } |
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| 99 | |||
| 100 | /* ------------------------------------------------------------------------ |
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| 101 | * Encapsulate the above functions in the correct operations structure. |
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| 102 | * This is only done when more than one hardware adapter is supported. |
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| 103 | */ |
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| 104 | |||
| 105 | static struct i2c_algo_bit_data bit_velle_data = { |
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| 106 | .setsda = bit_velle_setsda, |
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| 107 | .setscl = bit_velle_setscl, |
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| 108 | .getsda = bit_velle_getsda, |
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| 109 | .getscl = bit_velle_getscl, |
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| 110 | .udelay = 10, |
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| 111 | .mdelay = 10, |
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| 112 | .timeout = HZ |
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| 113 | }; |
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| 114 | |||
| 115 | static struct i2c_adapter bit_velle_ops = { |
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| 116 | .owner = THIS_MODULE, |
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| 117 | .algo_data = &bit_velle_data, |
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| 118 | .name = "Velleman K8000", |
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| 119 | }; |
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| 120 | |||
| 121 | static int __init i2c_bitvelle_init(void) |
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| 122 | { |
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| 123 | printk(KERN_INFO "i2c-velleman: i2c Velleman K8000 driver\n"); |
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| 124 | if (base==0) { |
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| 125 | /* probe some values */ |
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| 126 | base=DEFAULT_BASE; |
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| 127 | bit_velle_data.data=(void*)DEFAULT_BASE; |
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| 128 | if (bit_velle_init()==0) { |
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| 129 | if(i2c_bit_add_bus(&bit_velle_ops) < 0) |
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| 130 | return -ENODEV; |
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| 131 | } else { |
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| 132 | return -ENODEV; |
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| 133 | } |
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| 134 | } else { |
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| 135 | bit_velle_data.data=(void*)base; |
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| 136 | if (bit_velle_init()==0) { |
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| 137 | if(i2c_bit_add_bus(&bit_velle_ops) < 0) |
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| 138 | return -ENODEV; |
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| 139 | } else { |
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| 140 | return -ENODEV; |
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| 141 | } |
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| 142 | } |
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| 143 | printk(KERN_DEBUG "i2c-velleman: found device at %#x.\n",base); |
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| 144 | return 0; |
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| 145 | } |
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| 146 | |||
| 147 | static void __exit i2c_bitvelle_exit(void) |
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| 148 | { |
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| 149 | i2c_bit_del_bus(&bit_velle_ops); |
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| 150 | release_region(base, (base == 0x3bc) ? 3 : 8); |
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| 151 | } |
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| 152 | |||
| 153 | MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
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| 154 | MODULE_DESCRIPTION("I2C-Bus adapter routines for Velleman K8000 adapter"); |
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| 155 | MODULE_LICENSE("GPL"); |
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| 156 | |||
| 157 | MODULE_PARM(base, "i"); |
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| 158 | |||
| 159 | module_init(i2c_bitvelle_init); |
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| 160 | module_exit(i2c_bitvelle_exit); |