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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  *
   5  * cx88-i2c.c  --  all the i2c code is here
   6  *
   7  * Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   8  *                         & Marcus Metzler (mocm@thp.uni-koeln.de)
   9  * (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
  10  * (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  11  * (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org>
  12  *      - Multituner support and i2c address binding
  13  */
  14
  15 #include "cx88.h"
  16
  17 #include <linux/init.h>
  18 #include <linux/io.h>
  19 #include <linux/module.h>
  20
  21 #include <media/v4l2-common.h>
  22
  23 static unsigned int i2c_debug;
  24 module_param(i2c_debug, int, 0644);
  25 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  26
  27 static unsigned int i2c_scan;
  28 module_param(i2c_scan, int, 0444);
  29 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
  30
  31 static unsigned int i2c_udelay = 5;
  32 module_param(i2c_udelay, int, 0644);
  33 MODULE_PARM_DESC(i2c_udelay,
  34                  "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed.");
  35
  36 #define dprintk(level, fmt, arg...) do {                                \
  37         if (i2c_debug >= level)                                         \
  38                 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt),               \
  39                         __func__, ##arg);                               \
  40 } while (0)
  41
  42 /* ----------------------------------------------------------------------- */
  43
  44 static void cx8800_bit_setscl(void *data, int state)
  45 {
  46         struct cx88_core *core = data;
  47
  48         if (state)
  49                 core->i2c_state |= 0x02;
  50         else
  51                 core->i2c_state &= ~0x02;
  52         cx_write(MO_I2C, core->i2c_state);
  53         cx_read(MO_I2C);
  54 }
  55
  56 static void cx8800_bit_setsda(void *data, int state)
  57 {
  58         struct cx88_core *core = data;
  59
  60         if (state)
  61                 core->i2c_state |= 0x01;
  62         else
  63                 core->i2c_state &= ~0x01;
  64         cx_write(MO_I2C, core->i2c_state);
  65         cx_read(MO_I2C);
  66 }
  67
  68 static int cx8800_bit_getscl(void *data)
  69 {
  70         struct cx88_core *core = data;
  71         u32 state;
  72
  73         state = cx_read(MO_I2C);
  74         return state & 0x02 ? 1 : 0;
  75 }
  76
  77 static int cx8800_bit_getsda(void *data)
  78 {
  79         struct cx88_core *core = data;
  80         u32 state;
  81
  82         state = cx_read(MO_I2C);
  83         return state & 0x01;
  84 }
  85
  86 /* ----------------------------------------------------------------------- */
  87
  88 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
  89         .setsda  = cx8800_bit_setsda,
  90         .setscl  = cx8800_bit_setscl,
  91         .getsda  = cx8800_bit_getsda,
  92         .getscl  = cx8800_bit_getscl,
  93         .udelay  = 16,
  94         .timeout = 200,
  95 };
  96
  97 /* ----------------------------------------------------------------------- */
  98
  99 static const char * const i2c_devs[128] = {
 100         [0x1c >> 1] = "lgdt330x",
 101         [0x86 >> 1] = "tda9887/cx22702",
 102         [0xa0 >> 1] = "eeprom",
 103         [0xc0 >> 1] = "tuner (analog)",
 104         [0xc2 >> 1] = "tuner (analog/dvb)",
 105         [0xc8 >> 1] = "xc5000",
 106 };
 107
 108 static void do_i2c_scan(const char *name, struct i2c_client *c)
 109 {
 110         unsigned char buf;
 111         int i, rc;
 112
 113         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 114                 c->addr = i;
 115                 rc = i2c_master_recv(c, &buf, 0);
 116                 if (rc < 0)
 117                         continue;
 118                 pr_info("i2c scan: found device @ 0x%x  [%s]\n",
 119                         i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 120         }
 121 }
 122
 123 /* init + register i2c adapter */
 124 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 125 {
 126         /* Prevents usage of invalid delay values */
 127         if (i2c_udelay < 5)
 128                 i2c_udelay = 5;
 129
 130         core->i2c_algo = cx8800_i2c_algo_template;
 131
 132         core->i2c_adap.dev.parent = &pci->dev;
 133         strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name));
 134         core->i2c_adap.owner = THIS_MODULE;
 135         core->i2c_algo.udelay = i2c_udelay;
 136         core->i2c_algo.data = core;
 137         i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
 138         core->i2c_adap.algo_data = &core->i2c_algo;
 139         core->i2c_client.adapter = &core->i2c_adap;
 140         strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
 141
 142         cx8800_bit_setscl(core, 1);
 143         cx8800_bit_setsda(core, 1);
 144
 145         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 146         if (core->i2c_rc == 0) {
 147                 static u8 tuner_data[] = {
 148                         0x0b, 0xdc, 0x86, 0x52 };
 149                 static struct i2c_msg tuner_msg = {
 150                         .flags = 0,
 151                         .addr = 0xc2 >> 1,
 152                         .buf = tuner_data,
 153                         .len = 4
 154                 };
 155
 156                 dprintk(1, "i2c register ok\n");
 157                 switch (core->boardnr) {
 158                 case CX88_BOARD_HAUPPAUGE_HVR1300:
 159                 case CX88_BOARD_HAUPPAUGE_HVR3000:
 160                 case CX88_BOARD_HAUPPAUGE_HVR4000:
 161                         pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n");
 162                         i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
 163                         break;
 164                 default:
 165                         break;
 166                 }
 167                 if (i2c_scan)
 168                         do_i2c_scan(core->name, &core->i2c_client);
 169         } else
 170                 pr_err("i2c register FAILED\n");
 171
 172         return core->i2c_rc;
 173 }