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 const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 101         .setsda  = cx8800_bit_setsda,
 102         .setscl  = cx8800_bit_setscl,
 103         .getsda  = cx8800_bit_getsda,
 104         .getscl  = cx8800_bit_getscl,
 105         .udelay  = 16,
 106         .timeout = 200,
 107 };
 108
 109 /* ----------------------------------------------------------------------- */
 110
 111 static const char * const i2c_devs[128] = {
 112         [ 0x1c >> 1 ] = "lgdt330x",
 113         [ 0x86 >> 1 ] = "tda9887/cx22702",
 114         [ 0xa0 >> 1 ] = "eeprom",
 115         [ 0xc0 >> 1 ] = "tuner (analog)",
 116         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
 117         [ 0xc8 >> 1 ] = "xc5000",
 118 };
 119
 120 static void do_i2c_scan(const char *name, struct i2c_client *c)
 121 {
 122         unsigned char buf;
 123         int i,rc;
 124
 125         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 126                 c->addr = i;
 127                 rc = i2c_master_recv(c,&buf,0);
 128                 if (rc < 0)
 129                         continue;
 130                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 131                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 132         }
 133 }
 134
 135 /* init + register i2c algo-bit adapter */
 136 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 137 {
 138         /* Prevents usage of invalid delay values */
 139         if (i2c_udelay<5)
 140                 i2c_udelay=5;
 141
 142         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
 143                sizeof(core->i2c_algo));
 144
 145
 146         core->i2c_adap.dev.parent = &pci->dev;
 147         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
 148         core->i2c_adap.owner = THIS_MODULE;
 149         core->i2c_adap.id = I2C_HW_B_CX2388x;
 150         core->i2c_algo.udelay = i2c_udelay;
 151         core->i2c_algo.data = core;
 152         i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
 153         core->i2c_adap.algo_data = &core->i2c_algo;
 154         core->i2c_client.adapter = &core->i2c_adap;
 155         strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
 156
 157         cx8800_bit_setscl(core,1);
 158         cx8800_bit_setsda(core,1);
 159
 160         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 161         if (0 == core->i2c_rc) {
 162                 static u8 tuner_data[] =
 163                         { 0x0b, 0xdc, 0x86, 0x52 };
 164                 static struct i2c_msg tuner_msg =
 165                         { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 };
 166
 167                 dprintk(1, "i2c register ok\n");
 168                 switch( core->boardnr ) {
 169                         case CX88_BOARD_HAUPPAUGE_HVR1300:
 170                         case CX88_BOARD_HAUPPAUGE_HVR3000:
 171                         case CX88_BOARD_HAUPPAUGE_HVR4000:
 172                                 printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n",
 173                                         core->name);
 174                                 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
 175                                 break;
 176                         default:
 177                                 break;
 178                 }
 179                 if (i2c_scan)
 180                         do_i2c_scan(core->name,&core->i2c_client);
 181         } else
 182                 printk("%s: i2c register FAILED\n", core->name);
 183
 184         return core->i2c_rc;
 185 }