drivers/media/pci/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@kernel.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
  25 #include "cx88.h"
  26
  27 #include <linux/init.h>
  28 #include <linux/io.h>
  29 #include <linux/module.h>
  30
  31 #include <media/v4l2-common.h>
  32
  33 static unsigned int i2c_debug;
  34 module_param(i2c_debug, int, 0644);
  35 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  36
  37 static unsigned int i2c_scan;
  38 module_param(i2c_scan, int, 0444);
  39 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
  40
  41 static unsigned int i2c_udelay = 5;
  42 module_param(i2c_udelay, int, 0644);
  43 MODULE_PARM_DESC(i2c_udelay,
  44                  "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed.");
  45
  46 #define dprintk(level, fmt, arg...) do {                                \
  47         if (i2c_debug >= level)                                         \
  48                 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt),               \
  49                         __func__, ##arg);                               \
  50 } while (0)
  51
  52 /* ----------------------------------------------------------------------- */
  53
  54 static void cx8800_bit_setscl(void *data, int state)
  55 {
  56         struct cx88_core *core = data;
  57
  58         if (state)
  59                 core->i2c_state |= 0x02;
  60         else
  61                 core->i2c_state &= ~0x02;
  62         cx_write(MO_I2C, core->i2c_state);
  63         cx_read(MO_I2C);
  64 }
  65
  66 static void cx8800_bit_setsda(void *data, int state)
  67 {
  68         struct cx88_core *core = data;
  69
  70         if (state)
  71                 core->i2c_state |= 0x01;
  72         else
  73                 core->i2c_state &= ~0x01;
  74         cx_write(MO_I2C, core->i2c_state);
  75         cx_read(MO_I2C);
  76 }
  77
  78 static int cx8800_bit_getscl(void *data)
  79 {
  80         struct cx88_core *core = data;
  81         u32 state;
  82
  83         state = cx_read(MO_I2C);
  84         return state & 0x02 ? 1 : 0;
  85 }
  86
  87 static int cx8800_bit_getsda(void *data)
  88 {
  89         struct cx88_core *core = data;
  90         u32 state;
  91
  92         state = cx_read(MO_I2C);
  93         return state & 0x01;
  94 }
  95
  96 /* ----------------------------------------------------------------------- */
  97
  98 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
  99         .setsda  = cx8800_bit_setsda,
 100         .setscl  = cx8800_bit_setscl,
 101         .getsda  = cx8800_bit_getsda,
 102         .getscl  = cx8800_bit_getscl,
 103         .udelay  = 16,
 104         .timeout = 200,
 105 };
 106
 107 /* ----------------------------------------------------------------------- */
 108
 109 static const char * const i2c_devs[128] = {
 110         [0x1c >> 1] = "lgdt330x",
 111         [0x86 >> 1] = "tda9887/cx22702",
 112         [0xa0 >> 1] = "eeprom",
 113         [0xc0 >> 1] = "tuner (analog)",
 114         [0xc2 >> 1] = "tuner (analog/dvb)",
 115         [0xc8 >> 1] = "xc5000",
 116 };
 117
 118 static void do_i2c_scan(const char *name, struct i2c_client *c)
 119 {
 120         unsigned char buf;
 121         int i, rc;
 122
 123         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 124                 c->addr = i;
 125                 rc = i2c_master_recv(c, &buf, 0);
 126                 if (rc < 0)
 127                         continue;
 128                 pr_info("i2c scan: found device @ 0x%x  [%s]\n",
 129                         i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 130         }
 131 }
 132
 133 /* init + register i2c adapter */
 134 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 135 {
 136         /* Prevents usage of invalid delay values */
 137         if (i2c_udelay < 5)
 138                 i2c_udelay = 5;
 139
 140         core->i2c_algo = cx8800_i2c_algo_template;
 141
 142         core->i2c_adap.dev.parent = &pci->dev;
 143         strlcpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name));
 144         core->i2c_adap.owner = THIS_MODULE;
 145         core->i2c_algo.udelay = i2c_udelay;
 146         core->i2c_algo.data = core;
 147         i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
 148         core->i2c_adap.algo_data = &core->i2c_algo;
 149         core->i2c_client.adapter = &core->i2c_adap;
 150         strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
 151
 152         cx8800_bit_setscl(core, 1);
 153         cx8800_bit_setsda(core, 1);
 154
 155         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 156         if (core->i2c_rc == 0) {
 157                 static u8 tuner_data[] = {
 158                         0x0b, 0xdc, 0x86, 0x52 };
 159                 static struct i2c_msg tuner_msg = {
 160                         .flags = 0,
 161                         .addr = 0xc2 >> 1,
 162                         .buf = tuner_data,
 163                         .len = 4
 164                 };
 165
 166                 dprintk(1, "i2c register ok\n");
 167                 switch (core->boardnr) {
 168                 case CX88_BOARD_HAUPPAUGE_HVR1300:
 169                 case CX88_BOARD_HAUPPAUGE_HVR3000:
 170                 case CX88_BOARD_HAUPPAUGE_HVR4000:
 171                         pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n");
 172                         i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
 173                         break;
 174                 default:
 175                         break;
 176                 }
 177                 if (i2c_scan)
 178                         do_i2c_scan(core->name, &core->i2c_client);
 179         } else
 180                 pr_err("i2c register FAILED\n");
 181
 182         return core->i2c_rc;
 183 }