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

   1 /*
   2     $Id: cx88-i2c.c,v 1.20 2005/02/15 15:59:35 kraxel Exp $
   3
   4     cx88-i2c.c  --  all the i2c code is here
   5
   6     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   7                            & Marcus Metzler (mocm@thp.uni-koeln.de)
   8     (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
   9     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 */
  26
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/init.h>
  30
  31 #include <asm/io.h>
  32
  33 #include "cx88.h"
  34
  35 static unsigned int i2c_debug = 0;
  36 module_param(i2c_debug, int, 0644);
  37 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
  38
  39 static unsigned int i2c_scan = 0;
  40 module_param(i2c_scan, int, 0444);
  41 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  42
  43 #define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
  44         printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
  45
  46 /* ----------------------------------------------------------------------- */
  47
  48 static void cx8800_bit_setscl(void *data, int state)
  49 {
  50         struct cx88_core *core = data;
  51
  52         if (state)
  53                 core->i2c_state |= 0x02;
  54         else
  55                 core->i2c_state &= ~0x02;
  56         cx_write(MO_I2C, core->i2c_state);
  57         cx_read(MO_I2C);
  58 }
  59
  60 static void cx8800_bit_setsda(void *data, int state)
  61 {
  62         struct cx88_core *core = data;
  63
  64         if (state)
  65                 core->i2c_state |= 0x01;
  66         else
  67                 core->i2c_state &= ~0x01;
  68         cx_write(MO_I2C, core->i2c_state);
  69         cx_read(MO_I2C);
  70 }
  71
  72 static int cx8800_bit_getscl(void *data)
  73 {
  74         struct cx88_core *core = data;
  75         u32 state;
  76
  77         state = cx_read(MO_I2C);
  78         return state & 0x02 ? 1 : 0;
  79 }
  80
  81 static int cx8800_bit_getsda(void *data)
  82 {
  83         struct cx88_core *core = data;
  84         u32 state;
  85
  86         state = cx_read(MO_I2C);
  87         return state & 0x01;
  88 }
  89
  90 /* ----------------------------------------------------------------------- */
  91
  92 static int attach_inform(struct i2c_client *client)
  93 {
  94         struct cx88_core *core = i2c_get_adapdata(client->adapter);
  95
  96         dprintk(1, "i2c attach [addr=0x%x,client=%s]\n",
  97                 client->addr, i2c_clientname(client));
  98         if (!client->driver->command)
  99                 return 0;
 100
 101         if (core->tuner_type != UNSET)
 102                 client->driver->command(client, TUNER_SET_TYPE, &core->tuner_type);
 103         if (core->tda9887_conf)
 104                 client->driver->command(client, TDA9887_SET_CONFIG, &core->tda9887_conf);
 105         return 0;
 106 }
 107
 108 static int detach_inform(struct i2c_client *client)
 109 {
 110         struct cx88_core *core = i2c_get_adapdata(client->adapter);
 111
 112         dprintk(1, "i2c detach [client=%s]\n", i2c_clientname(client));
 113         return 0;
 114 }
 115
 116 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
 117 {
 118         if (0 != core->i2c_rc)
 119                 return;
 120         i2c_clients_command(&core->i2c_adap, cmd, arg);
 121 }
 122
 123 static struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 124         .setsda  = cx8800_bit_setsda,
 125         .setscl  = cx8800_bit_setscl,
 126         .getsda  = cx8800_bit_getsda,
 127         .getscl  = cx8800_bit_getscl,
 128         .udelay  = 16,
 129         .mdelay  = 10,
 130         .timeout = 200,
 131 };
 132
 133 /* ----------------------------------------------------------------------- */
 134
 135 static struct i2c_adapter cx8800_i2c_adap_template = {
 136         I2C_DEVNAME("cx2388x"),
 137         .owner             = THIS_MODULE,
 138         .id                = I2C_HW_B_CX2388x,
 139         .client_register   = attach_inform,
 140         .client_unregister = detach_inform,
 141 };
 142
 143 static struct i2c_client cx8800_i2c_client_template = {
 144         I2C_DEVNAME("cx88xx internal"),
 145 };
 146
 147 static char *i2c_devs[128] = {
 148         [ 0x86 >> 1 ] = "tda9887/cx22702",
 149         [ 0xa0 >> 1 ] = "eeprom",
 150         [ 0xc0 >> 1 ] = "tuner (analog)",
 151         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
 152 };
 153
 154 static void do_i2c_scan(char *name, struct i2c_client *c)
 155 {
 156         unsigned char buf;
 157         int i,rc;
 158
 159         for (i = 0; i < 128; i++) {
 160                 c->addr = i;
 161                 rc = i2c_master_recv(c,&buf,0);
 162                 if (rc < 0)
 163                         continue;
 164                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 165                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 166         }
 167 }
 168
 169 /* init + register i2c algo-bit adapter */
 170 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 171 {
 172         memcpy(&core->i2c_adap, &cx8800_i2c_adap_template,
 173                sizeof(core->i2c_adap));
 174         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
 175                sizeof(core->i2c_algo));
 176         memcpy(&core->i2c_client, &cx8800_i2c_client_template,
 177                sizeof(core->i2c_client));
 178
 179         if (core->tuner_type != TUNER_ABSENT)
 180                 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
 181         if (cx88_boards[core->board].dvb)
 182                 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 183
 184         core->i2c_adap.dev.parent = &pci->dev;
 185         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
 186         core->i2c_algo.data = core;
 187         i2c_set_adapdata(&core->i2c_adap,core);
 188         core->i2c_adap.algo_data = &core->i2c_algo;
 189         core->i2c_client.adapter = &core->i2c_adap;
 190
 191         cx8800_bit_setscl(core,1);
 192         cx8800_bit_setsda(core,1);
 193
 194         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 195         if (0 == core->i2c_rc) {
 196                 dprintk(1, "i2c register ok\n");
 197                 if (i2c_scan)
 198                         do_i2c_scan(core->name,&core->i2c_client);
 199         } else
 200                 printk("%s: i2c register FAILED\n", core->name);
 201         return core->i2c_rc;
 202 }
 203
 204 /* ----------------------------------------------------------------------- */
 205
 206 EXPORT_SYMBOL(cx88_call_i2c_clients);
 207 EXPORT_SYMBOL(cx88_i2c_init);
 208
 209 /*
 210  * Local variables:
 211  * c-basic-offset: 8
 212  * End:
 213  */