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/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <linux/i2c.h>
  21 #include <linux/i2c-algo-bit.h>
  22 #include <asm/hardware.h>
  23
  24
  25 static void frodo_setsda (void *data,int state)
  26 {
  27         if (state)
  28                 FRODO_CPLD_I2C |= FRODO_I2C_SDA_OUT;
  29         else
  30                 FRODO_CPLD_I2C &= ~FRODO_I2C_SDA_OUT;
  31 }
  32
  33 static void frodo_setscl (void *data,int state)
  34 {
  35         if (state)
  36                 FRODO_CPLD_I2C |= FRODO_I2C_SCL_OUT;
  37         else
  38                 FRODO_CPLD_I2C &= ~FRODO_I2C_SCL_OUT;
  39 }
  40
  41 static int frodo_getsda (void *data)
  42 {
  43         return ((FRODO_CPLD_I2C & FRODO_I2C_SDA_IN) != 0);
  44 }
  45
  46 static int frodo_getscl (void *data)
  47 {
  48         return ((FRODO_CPLD_I2C & FRODO_I2C_SCL_IN) != 0);
  49 }
  50
  51 static struct i2c_algo_bit_data bit_frodo_data = {
  52         .setsda         = frodo_setsda,
  53         .setscl         = frodo_setscl,
  54         .getsda         = frodo_getsda,
  55         .getscl         = frodo_getscl,
  56         .udelay         = 80,
  57         .mdelay         = 80,
  58         .timeout        = HZ
  59 };
  60
  61 static struct i2c_adapter frodo_ops = {
  62         .owner                  = THIS_MODULE,
  63         .id                     = I2C_HW_B_FRODO,
  64         .algo_data              = &bit_frodo_data,
  65         .dev                    = {
  66                 .name           = "Frodo adapter driver",
  67         },
  68 };
  69
  70 static int __init i2c_frodo_init (void)
  71 {
  72         return i2c_bit_add_bus(&frodo_ops);
  73 }
  74
  75 static void __exit i2c_frodo_exit (void)
  76 {
  77         i2c_bit_del_bus(&frodo_ops);
  78 }
  79
  80 MODULE_AUTHOR ("Abraham van der Merwe <abraham@2d3d.co.za>");
  81 MODULE_DESCRIPTION ("I2C-Bus adapter routines for Frodo");
  82 MODULE_LICENSE ("GPL");
  83
  84 module_init (i2c_frodo_init);
  85 module_exit (i2c_frodo_exit);
  86