drivers/i2c/busses/i2c-frodo.c

   1
   2 /*
   3  * linux/drivers/i2c/i2c-frodo.c
   4  *
   5  * Author: Abraham van der Merwe <abraham@2d3d.co.za>
   6  *
   7  * An I2C adapter driver for the 2d3D, Inc. StrongARM SA-1110
   8  * Development board (Frodo).
   9  *
  10  * This source code is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/i2c.h>
  20 #include <linux/i2c-algo-bit.h>
  21 #include <asm/hardware.h>
  22
  23
  24 static void frodo_setsda (void *data,int state)
  25 {
  26         if (state)
  27                 FRODO_CPLD_I2C |= FRODO_I2C_SDA_OUT;
  28         else
  29                 FRODO_CPLD_I2C &= ~FRODO_I2C_SDA_OUT;
  30 }
  31
  32 static void frodo_setscl (void *data,int state)
  33 {
  34         if (state)
  35                 FRODO_CPLD_I2C |= FRODO_I2C_SCL_OUT;
  36         else
  37                 FRODO_CPLD_I2C &= ~FRODO_I2C_SCL_OUT;
  38 }
  39
  40 static int frodo_getsda (void *data)
  41 {
  42         return ((FRODO_CPLD_I2C & FRODO_I2C_SDA_IN) != 0);
  43 }
  44
  45 static int frodo_getscl (void *data)
  46 {
  47         return ((FRODO_CPLD_I2C & FRODO_I2C_SCL_IN) != 0);
  48 }
  49
  50 static struct i2c_algo_bit_data bit_frodo_data = {
  51         .setsda         = frodo_setsda,
  52         .setscl         = frodo_setscl,
  53         .getsda         = frodo_getsda,
  54         .getscl         = frodo_getscl,
  55         .udelay         = 80,
  56         .mdelay         = 80,
  57         .timeout        = HZ
  58 };
  59
  60 static struct i2c_adapter frodo_ops = {
  61         .owner                  = THIS_MODULE,
  62         .id                     = I2C_HW_B_FRODO,
  63         .algo_data              = &bit_frodo_data,
  64         .dev                    = {
  65                 .name           = "Frodo adapter driver",
  66         },
  67 };
  68
  69 static int __init i2c_frodo_init (void)
  70 {
  71         return i2c_bit_add_bus(&frodo_ops);
  72 }
  73
  74 static void __exit i2c_frodo_exit (void)
  75 {
  76         i2c_bit_del_bus(&frodo_ops);
  77 }
  78
  79 MODULE_AUTHOR ("Abraham van der Merwe <abraham@2d3d.co.za>");
  80 MODULE_DESCRIPTION ("I2C-Bus adapter routines for Frodo");
  81 MODULE_LICENSE ("GPL");
  82
  83 module_init (i2c_frodo_init);
  84 module_exit (i2c_frodo_exit);
  85