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/init.h>
  32
  33 #include <asm/io.h>
  34
  35 #include "cx88.h"
  36 #include <media/v4l2-common.h>
  37
  38 static unsigned int i2c_debug;
  39 module_param(i2c_debug, int, 0644);
  40 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
  41
  42 static unsigned int i2c_scan;
  43 module_param(i2c_scan, int, 0444);
  44 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  45
  46 static unsigned int i2c_udelay = 5;
  47 module_param(i2c_udelay, int, 0644);
  48 MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
  49                 "(should be 5 or higher). Lower value means higher bus speed.");
  50
  51 #define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
  52         printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
  53
  54 /* ----------------------------------------------------------------------- */
  55
  56 static void cx8800_bit_setscl(void *data, int state)
  57 {
  58         struct cx88_core *core = data;
  59
  60         if (state)
  61                 core->i2c_state |= 0x02;
  62         else
  63                 core->i2c_state &= ~0x02;
  64         cx_write(MO_I2C, core->i2c_state);
  65         cx_read(MO_I2C);
  66 }
  67
  68 static void cx8800_bit_setsda(void *data, int state)
  69 {
  70         struct cx88_core *core = data;
  71
  72         if (state)
  73                 core->i2c_state |= 0x01;
  74         else
  75                 core->i2c_state &= ~0x01;
  76         cx_write(MO_I2C, core->i2c_state);
  77         cx_read(MO_I2C);
  78 }
  79
  80 static int cx8800_bit_getscl(void *data)
  81 {
  82         struct cx88_core *core = data;
  83         u32 state;
  84
  85         state = cx_read(MO_I2C);
  86         return state & 0x02 ? 1 : 0;
  87 }
  88
  89 static int cx8800_bit_getsda(void *data)
  90 {
  91         struct cx88_core *core = data;
  92         u32 state;
  93
  94         state = cx_read(MO_I2C);
  95         return state & 0x01;
  96 }
  97
  98 /* ----------------------------------------------------------------------- */
  99
 100 static int attach_inform(struct i2c_client *client)
 101 {
 102         struct cx88_core *core = i2c_get_adapdata(client->adapter);
 103
 104         dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
 105                 client->driver->driver.name, client->addr, client->name);
 106
 107         return 0;
 108 }
 109
 110 static int detach_inform(struct i2c_client *client)
 111 {
 112         struct cx88_core *core = i2c_get_adapdata(client->adapter);
 113
 114         dprintk(1, "i2c detach [client=%s]\n", client->name);
 115         return 0;
 116 }
 117
 118 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
 119 {
 120         if (0 != core->i2c_rc)
 121                 return;
 122
 123 #if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
 124         if ( (core->dvbdev) && (core->dvbdev->dvb.frontend) ) {
 125                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
 126                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 1);
 127
 128                 i2c_clients_command(&core->i2c_adap, cmd, arg);
 129
 130                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
 131                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 0);
 132         } else
 133 #endif
 134                 i2c_clients_command(&core->i2c_adap, cmd, arg);
 135 }
 136
 137 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 138         .setsda  = cx8800_bit_setsda,
 139         .setscl  = cx8800_bit_setscl,
 140         .getsda  = cx8800_bit_getsda,
 141         .getscl  = cx8800_bit_getscl,
 142         .udelay  = 16,
 143         .timeout = 200,
 144 };
 145
 146 /* ----------------------------------------------------------------------- */
 147
 148 static char *i2c_devs[128] = {
 149         [ 0x1c >> 1 ] = "lgdt330x",
 150         [ 0x86 >> 1 ] = "tda9887/cx22702",
 151         [ 0xa0 >> 1 ] = "eeprom",
 152         [ 0xc0 >> 1 ] = "tuner (analog)",
 153         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
 154         [ 0xc8 >> 1 ] = "xc5000",
 155 };
 156
 157 static void do_i2c_scan(char *name, struct i2c_client *c)
 158 {
 159         unsigned char buf;
 160         int i,rc;
 161
 162         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 163                 c->addr = i;
 164                 rc = i2c_master_recv(c,&buf,0);
 165                 if (rc < 0)
 166                         continue;
 167                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 168                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 169         }
 170 }
 171
 172 /* init + register i2c algo-bit adapter */
 173 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 174 {
 175         /* Prevents usage of invalid delay values */
 176         if (i2c_udelay<5)
 177                 i2c_udelay=5;
 178
 179         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
 180                sizeof(core->i2c_algo));
 181
 182         if (core->board.tuner_type != TUNER_ABSENT)
 183                 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
 184         if (core->board.mpeg & CX88_MPEG_DVB)
 185                 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 186
 187         core->i2c_adap.dev.parent = &pci->dev;
 188         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
 189         core->i2c_adap.owner = THIS_MODULE;
 190         core->i2c_adap.id = I2C_HW_B_CX2388x;
 191         core->i2c_adap.client_register = attach_inform;
 192         core->i2c_adap.client_unregister = detach_inform;
 193         core->i2c_algo.udelay = i2c_udelay;
 194         core->i2c_algo.data = core;
 195         i2c_set_adapdata(&core->i2c_adap,core);
 196         core->i2c_adap.algo_data = &core->i2c_algo;
 197         core->i2c_client.adapter = &core->i2c_adap;
 198         strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
 199
 200         cx8800_bit_setscl(core,1);
 201         cx8800_bit_setsda(core,1);
 202
 203         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 204         if (0 == core->i2c_rc) {
 205                 dprintk(1, "i2c register ok\n");
 206                 if (i2c_scan)
 207                         do_i2c_scan(core->name,&core->i2c_client);
 208         } else
 209                 printk("%s: i2c register FAILED\n", core->name);
 210         return core->i2c_rc;
 211 }
 212
 213 /* ----------------------------------------------------------------------- */
 214
 215 EXPORT_SYMBOL(cx88_call_i2c_clients);
 216
 217 /*
 218  * Local variables:
 219  * c-basic-offset: 8
 220  * End:
 221  */