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

   1 /*
   2
   3     cx88-i2c.c  --  all the i2c code is here
   4
   5     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   6                            & Marcus Metzler (mocm@thp.uni-koeln.de)
   7     (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
   8     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program; if not, write to the Free Software
  22     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 */
  25
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/init.h>
  29
  30 #include <asm/io.h>
  31
  32 #include "cx88.h"
  33
  34 static unsigned int i2c_debug = 0;
  35 module_param(i2c_debug, int, 0644);
  36 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
  37
  38 static unsigned int i2c_scan = 0;
  39 module_param(i2c_scan, int, 0444);
  40 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  41
  42 #define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
  43         printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
  44
  45 /* ----------------------------------------------------------------------- */
  46
  47 static void cx8800_bit_setscl(void *data, int state)
  48 {
  49         struct cx88_core *core = data;
  50
  51         if (state)
  52                 core->i2c_state |= 0x02;
  53         else
  54                 core->i2c_state &= ~0x02;
  55         cx_write(MO_I2C, core->i2c_state);
  56         cx_read(MO_I2C);
  57 }
  58
  59 static void cx8800_bit_setsda(void *data, int state)
  60 {
  61         struct cx88_core *core = data;
  62
  63         if (state)
  64                 core->i2c_state |= 0x01;
  65         else
  66                 core->i2c_state &= ~0x01;
  67         cx_write(MO_I2C, core->i2c_state);
  68         cx_read(MO_I2C);
  69 }
  70
  71 static int cx8800_bit_getscl(void *data)
  72 {
  73         struct cx88_core *core = data;
  74         u32 state;
  75
  76         state = cx_read(MO_I2C);
  77         return state & 0x02 ? 1 : 0;
  78 }
  79
  80 static int cx8800_bit_getsda(void *data)
  81 {
  82         struct cx88_core *core = data;
  83         u32 state;
  84
  85         state = cx_read(MO_I2C);
  86         return state & 0x01;
  87 }
  88
  89 /* ----------------------------------------------------------------------- */
  90
  91 static int attach_inform(struct i2c_client *client)
  92 {
  93         struct tuner_setup tun_setup;
  94         struct cx88_core *core = i2c_get_adapdata(client->adapter);
  95
  96         dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
  97                 client->driver->name, client->addr, client->name);
  98         if (!client->driver->command)
  99                 return 0;
 100
 101         if (core->radio_type != UNSET) {
 102                 if ((core->radio_addr==ADDR_UNSET)||(core->radio_addr==client->addr)) {
 103                         tun_setup.mode_mask = T_RADIO;
 104                         tun_setup.type = core->radio_type;
 105                         tun_setup.addr = core->radio_addr;
 106
 107                         client->driver->command (client, TUNER_SET_TYPE_ADDR, &tun_setup);
 108                 }
 109         }
 110         if (core->tuner_type != UNSET) {
 111                 if ((core->tuner_addr==ADDR_UNSET)||(core->tuner_addr==client->addr)) {
 112
 113                         tun_setup.mode_mask = T_ANALOG_TV;
 114                         tun_setup.type = core->tuner_type;
 115                         tun_setup.addr = core->tuner_addr;
 116
 117                         client->driver->command (client,TUNER_SET_TYPE_ADDR, &tun_setup);
 118                 }
 119         }
 120
 121         if (core->tda9887_conf)
 122                 client->driver->command(client, TDA9887_SET_CONFIG, &core->tda9887_conf);
 123         return 0;
 124 }
 125
 126 static int detach_inform(struct i2c_client *client)
 127 {
 128         struct cx88_core *core = i2c_get_adapdata(client->adapter);
 129
 130         dprintk(1, "i2c detach [client=%s]\n", client->name);
 131         return 0;
 132 }
 133
 134 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
 135 {
 136         if (0 != core->i2c_rc)
 137                 return;
 138         i2c_clients_command(&core->i2c_adap, cmd, arg);
 139 }
 140
 141 static struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 142         .setsda  = cx8800_bit_setsda,
 143         .setscl  = cx8800_bit_setscl,
 144         .getsda  = cx8800_bit_getsda,
 145         .getscl  = cx8800_bit_getscl,
 146         .udelay  = 16,
 147         .mdelay  = 10,
 148         .timeout = 200,
 149 };
 150
 151 /* ----------------------------------------------------------------------- */
 152
 153 static struct i2c_adapter cx8800_i2c_adap_template = {
 154         .name              = "cx2388x",
 155         .owner             = THIS_MODULE,
 156         .id                = I2C_HW_B_CX2388x,
 157         .client_register   = attach_inform,
 158         .client_unregister = detach_inform,
 159 };
 160
 161 static struct i2c_client cx8800_i2c_client_template = {
 162         .name   = "cx88xx internal",
 163 };
 164
 165 static char *i2c_devs[128] = {
 166         [ 0x1c >> 1 ] = "lgdt330x",
 167         [ 0x86 >> 1 ] = "tda9887/cx22702",
 168         [ 0xa0 >> 1 ] = "eeprom",
 169         [ 0xc0 >> 1 ] = "tuner (analog)",
 170         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
 171 };
 172
 173 static void do_i2c_scan(char *name, struct i2c_client *c)
 174 {
 175         unsigned char buf;
 176         int i,rc;
 177
 178         for (i = 0; i < 128; i++) {
 179                 c->addr = i;
 180                 rc = i2c_master_recv(c,&buf,0);
 181                 if (rc < 0)
 182                         continue;
 183                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 184                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 185         }
 186 }
 187
 188 /* init + register i2c algo-bit adapter */
 189 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 190 {
 191         memcpy(&core->i2c_adap, &cx8800_i2c_adap_template,
 192                sizeof(core->i2c_adap));
 193         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
 194                sizeof(core->i2c_algo));
 195         memcpy(&core->i2c_client, &cx8800_i2c_client_template,
 196                sizeof(core->i2c_client));
 197
 198         if (core->tuner_type != TUNER_ABSENT)
 199                 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
 200         if (cx88_boards[core->board].dvb)
 201                 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 202
 203         core->i2c_adap.dev.parent = &pci->dev;
 204         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
 205         core->i2c_algo.data = core;
 206         i2c_set_adapdata(&core->i2c_adap,core);
 207         core->i2c_adap.algo_data = &core->i2c_algo;
 208         core->i2c_client.adapter = &core->i2c_adap;
 209
 210         cx8800_bit_setscl(core,1);
 211         cx8800_bit_setsda(core,1);
 212
 213         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 214         if (0 == core->i2c_rc) {
 215                 dprintk(1, "i2c register ok\n");
 216                 if (i2c_scan)
 217                         do_i2c_scan(core->name,&core->i2c_client);
 218         } else
 219                 printk("%s: i2c register FAILED\n", core->name);
 220         return core->i2c_rc;
 221 }
 222
 223 /* ----------------------------------------------------------------------- */
 224
 225 EXPORT_SYMBOL(cx88_call_i2c_clients);
 226 EXPORT_SYMBOL(cx88_i2c_init);
 227
 228 /*
 229  * Local variables:
 230  * c-basic-offset: 8
 231  * End:
 232  */