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

   1
   2 /*
   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     (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
  12         - Multituner support and i2c address binding
  13
  14     This program is free software; you can redistribute it and/or modify
  15     it under the terms of the GNU General Public License as published by
  16     the Free Software Foundation; either version 2 of the License, or
  17     (at your option) any later version.
  18
  19     This program is distributed in the hope that it will be useful,
  20     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22     GNU General Public License for more details.
  23
  24     You should have received a copy of the GNU General Public License
  25     along with this program; if not, write to the Free Software
  26     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27
  28 */
  29
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/init.h>
  33
  34 #include <asm/io.h>
  35
  36 #include "cx88.h"
  37 #include <media/v4l2-common.h>
  38
  39 static unsigned int i2c_debug = 0;
  40 module_param(i2c_debug, int, 0644);
  41 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
  42
  43 static unsigned int i2c_scan = 0;
  44 module_param(i2c_scan, int, 0444);
  45 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  46
  47 static unsigned int i2c_udelay = 5;
  48 module_param(i2c_udelay, int, 0644);
  49 MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
  50                 "(should be 5 or higher). Lower value means higher bus speed.");
  51
  52 #define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
  53         printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
  54
  55 /* ----------------------------------------------------------------------- */
  56
  57 static void cx8800_bit_setscl(void *data, int state)
  58 {
  59         struct cx88_core *core = data;
  60
  61         if (state)
  62                 core->i2c_state |= 0x02;
  63         else
  64                 core->i2c_state &= ~0x02;
  65         cx_write(MO_I2C, core->i2c_state);
  66         cx_read(MO_I2C);
  67 }
  68
  69 static void cx8800_bit_setsda(void *data, int state)
  70 {
  71         struct cx88_core *core = data;
  72
  73         if (state)
  74                 core->i2c_state |= 0x01;
  75         else
  76                 core->i2c_state &= ~0x01;
  77         cx_write(MO_I2C, core->i2c_state);
  78         cx_read(MO_I2C);
  79 }
  80
  81 static int cx8800_bit_getscl(void *data)
  82 {
  83         struct cx88_core *core = data;
  84         u32 state;
  85
  86         state = cx_read(MO_I2C);
  87         return state & 0x02 ? 1 : 0;
  88 }
  89
  90 static int cx8800_bit_getsda(void *data)
  91 {
  92         struct cx88_core *core = data;
  93         u32 state;
  94
  95         state = cx_read(MO_I2C);
  96         return state & 0x01;
  97 }
  98
  99 /* ----------------------------------------------------------------------- */
 100
 101 static int attach_inform(struct i2c_client *client)
 102 {
 103         struct tuner_setup tun_setup;
 104         struct cx88_core *core = i2c_get_adapdata(client->adapter);
 105
 106         dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
 107                 client->driver->driver.name, client->addr, client->name);
 108         if (!client->driver->command)
 109                 return 0;
 110
 111         if (core->radio_type != UNSET) {
 112                 if ((core->radio_addr==ADDR_UNSET)||(core->radio_addr==client->addr)) {
 113                         tun_setup.mode_mask = T_RADIO;
 114                         tun_setup.type = core->radio_type;
 115                         tun_setup.addr = core->radio_addr;
 116
 117                         client->driver->command (client, TUNER_SET_TYPE_ADDR, &tun_setup);
 118                 }
 119         }
 120         if (core->tuner_type != UNSET) {
 121                 if ((core->tuner_addr==ADDR_UNSET)||(core->tuner_addr==client->addr)) {
 122
 123                         tun_setup.mode_mask = T_ANALOG_TV;
 124                         tun_setup.type = core->tuner_type;
 125                         tun_setup.addr = core->tuner_addr;
 126
 127                         client->driver->command (client,TUNER_SET_TYPE_ADDR, &tun_setup);
 128                 }
 129         }
 130
 131         if (core->tda9887_conf)
 132                 client->driver->command(client, TDA9887_SET_CONFIG, &core->tda9887_conf);
 133         return 0;
 134 }
 135
 136 static int detach_inform(struct i2c_client *client)
 137 {
 138         struct cx88_core *core = i2c_get_adapdata(client->adapter);
 139
 140         dprintk(1, "i2c detach [client=%s]\n", client->name);
 141         return 0;
 142 }
 143
 144 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
 145 {
 146         if (0 != core->i2c_rc)
 147                 return;
 148
 149 #if defined(CONFIG_VIDEO_BUF_DVB) || defined(CONFIG_VIDEO_BUF_DVB_MODULE)
 150         if ( (core->dvbdev) && (core->dvbdev->dvb.frontend) ) {
 151                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
 152                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 1);
 153
 154                 i2c_clients_command(&core->i2c_adap, cmd, arg);
 155
 156                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
 157                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 0);
 158         } else
 159 #endif
 160                 i2c_clients_command(&core->i2c_adap, cmd, arg);
 161 }
 162
 163 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 164         .setsda  = cx8800_bit_setsda,
 165         .setscl  = cx8800_bit_setscl,
 166         .getsda  = cx8800_bit_getsda,
 167         .getscl  = cx8800_bit_getscl,
 168         .udelay  = 16,
 169         .timeout = 200,
 170 };
 171
 172 /* ----------------------------------------------------------------------- */
 173
 174 static char *i2c_devs[128] = {
 175         [ 0x1c >> 1 ] = "lgdt330x",
 176         [ 0x86 >> 1 ] = "tda9887/cx22702",
 177         [ 0xa0 >> 1 ] = "eeprom",
 178         [ 0xc0 >> 1 ] = "tuner (analog)",
 179         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
 180 };
 181
 182 static void do_i2c_scan(char *name, struct i2c_client *c)
 183 {
 184         unsigned char buf;
 185         int i,rc;
 186
 187         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 188                 c->addr = i;
 189                 rc = i2c_master_recv(c,&buf,0);
 190                 if (rc < 0)
 191                         continue;
 192                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 193                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 194         }
 195 }
 196
 197 /* init + register i2c algo-bit adapter */
 198 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 199 {
 200         /* Prevents usage of invalid delay values */
 201         if (i2c_udelay<5)
 202                 i2c_udelay=5;
 203
 204         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
 205                sizeof(core->i2c_algo));
 206
 207         if (core->tuner_type != TUNER_ABSENT)
 208                 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
 209         if (cx88_boards[core->board].mpeg & CX88_MPEG_DVB)
 210                 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 211
 212         core->i2c_adap.dev.parent = &pci->dev;
 213         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
 214         core->i2c_adap.owner = THIS_MODULE;
 215         core->i2c_adap.id = I2C_HW_B_CX2388x;
 216         core->i2c_adap.client_register = attach_inform;
 217         core->i2c_adap.client_unregister = detach_inform;
 218         core->i2c_algo.udelay = i2c_udelay;
 219         core->i2c_algo.data = core;
 220         i2c_set_adapdata(&core->i2c_adap,core);
 221         core->i2c_adap.algo_data = &core->i2c_algo;
 222         core->i2c_client.adapter = &core->i2c_adap;
 223         strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
 224
 225         cx8800_bit_setscl(core,1);
 226         cx8800_bit_setsda(core,1);
 227
 228         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 229         if (0 == core->i2c_rc) {
 230                 dprintk(1, "i2c register ok\n");
 231                 if (i2c_scan)
 232                         do_i2c_scan(core->name,&core->i2c_client);
 233         } else
 234                 printk("%s: i2c register FAILED\n", core->name);
 235         return core->i2c_rc;
 236 }
 237
 238 /* ----------------------------------------------------------------------- */
 239
 240 EXPORT_SYMBOL(cx88_call_i2c_clients);
 241
 242 /*
 243  * Local variables:
 244  * c-basic-offset: 8
 245  * End:
 246  */