drivers/media/video/cx88/cx88-i2c.c

   1 /*
   2     cx88-i2c.c  --  all the i2c code is here
   3
   4     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   5                            & Marcus Metzler (mocm@thp.uni-koeln.de)
   6     (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
   7     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27
  28 #include <asm/io.h>
  29
  30 #include "cx88.h"
  31
  32 /* ----------------------------------------------------------------------- */
  33
  34 void cx8800_bit_setscl(void *data, int state)
  35 {
  36         struct cx8800_dev *dev = data;
  37
  38         if (state)
  39                 dev->i2c_state |= 0x02;
  40         else
  41                 dev->i2c_state &= ~0x02;
  42         cx_write(MO_I2C, dev->i2c_state);
  43         cx_read(MO_I2C);
  44 }
  45
  46 void cx8800_bit_setsda(void *data, int state)
  47 {
  48         struct cx8800_dev *dev = data;
  49
  50         if (state)
  51                 dev->i2c_state |= 0x01;
  52         else
  53                 dev->i2c_state &= ~0x01;
  54         cx_write(MO_I2C, dev->i2c_state);
  55         cx_read(MO_I2C);
  56 }
  57
  58 static int cx8800_bit_getscl(void *data)
  59 {
  60         struct cx8800_dev *dev = data;
  61         u32 state;
  62
  63         state = cx_read(MO_I2C);
  64         return state & 0x02 ? 1 : 0;
  65 }
  66
  67 static int cx8800_bit_getsda(void *data)
  68 {
  69         struct cx8800_dev *dev = data;
  70         u32 state;
  71
  72         state = cx_read(MO_I2C);
  73         return state & 0x01;
  74 }
  75
  76 /* ----------------------------------------------------------------------- */
  77
  78 #ifndef I2C_PEC
  79 static void cx8800_inc_use(struct i2c_adapter *adap)
  80 {
  81         MOD_INC_USE_COUNT;
  82 }
  83
  84 static void cx8800_dec_use(struct i2c_adapter *adap)
  85 {
  86         MOD_DEC_USE_COUNT;
  87 }
  88 #endif
  89
  90 static int attach_inform(struct i2c_client *client)
  91 {
  92         struct cx8800_dev *dev = i2c_get_adapdata(client->adapter);
  93
  94         if (dev->tuner_type != UNSET)
  95                 cx8800_call_i2c_clients(dev,TUNER_SET_TYPE,&dev->tuner_type);
  96
  97         if (1 /* fixme: debug */)
  98                 printk("%s: i2c attach [client=%s]\n",
  99                        dev->name, i2c_clientname(client));
 100         return 0;
 101 }
 102
 103 void cx8800_call_i2c_clients(struct cx8800_dev *dev, unsigned int cmd, void *arg)
 104 {
 105         if (0 != dev->i2c_rc)
 106                 return;
 107         i2c_clients_command(&dev->i2c_adap, cmd, arg);
 108 }
 109
 110 static struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 111         .setsda  = cx8800_bit_setsda,
 112         .setscl  = cx8800_bit_setscl,
 113         .getsda  = cx8800_bit_getsda,
 114         .getscl  = cx8800_bit_getscl,
 115         .udelay  = 16,
 116         .mdelay  = 10,
 117         .timeout = 200,
 118 };
 119
 120 /* ----------------------------------------------------------------------- */
 121
 122 static struct i2c_adapter cx8800_i2c_adap_template = {
 123 #ifdef I2C_PEC
 124         .owner             = THIS_MODULE,
 125 #else
 126         .inc_use           = cx8800_inc_use,
 127         .dec_use           = cx8800_dec_use,
 128 #endif
 129 #ifdef I2C_CLASS_TV_ANALOG
 130         .class             = I2C_CLASS_TV_ANALOG,
 131 #endif
 132         I2C_DEVNAME("cx2388x"),
 133         .id                = I2C_HW_B_BT848,
 134         .client_register   = attach_inform,
 135 };
 136
 137 static struct i2c_client cx8800_i2c_client_template = {
 138         I2C_DEVNAME("cx88xx internal"),
 139         .id   = -1,
 140 };
 141
 142 /* init + register i2c algo-bit adapter */
 143 int __devinit cx8800_i2c_init(struct cx8800_dev *dev)
 144 {
 145         memcpy(&dev->i2c_adap, &cx8800_i2c_adap_template,
 146                sizeof(dev->i2c_adap));
 147         memcpy(&dev->i2c_algo, &cx8800_i2c_algo_template,
 148                sizeof(dev->i2c_algo));
 149         memcpy(&dev->i2c_client, &cx8800_i2c_client_template,
 150                sizeof(dev->i2c_client));
 151
 152         dev->i2c_adap.dev.parent = &dev->pci->dev;
 153         strlcpy(dev->i2c_adap.name,dev->name,sizeof(dev->i2c_adap.name));
 154         dev->i2c_algo.data = dev;
 155         i2c_set_adapdata(&dev->i2c_adap,dev);
 156         dev->i2c_adap.algo_data = &dev->i2c_algo;
 157         dev->i2c_client.adapter = &dev->i2c_adap;
 158
 159         cx8800_bit_setscl(dev,1);
 160         cx8800_bit_setsda(dev,1);
 161
 162         dev->i2c_rc = i2c_bit_add_bus(&dev->i2c_adap);
 163         printk("%s: i2c register %s\n", dev->name,
 164                (0 == dev->i2c_rc) ? "ok" : "FAILED");
 165         return dev->i2c_rc;
 166 }
 167
 168 /*
 169  * Local variables:
 170  * c-basic-offset: 8
 171  * End:
 172  */