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1// SPDX-License-Identifier: GPL-2.0-or-later2 3/*4 *5 * cx88-i2c.c -- all the i2c code is here6 *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 binding13 */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 23static unsigned int i2c_debug;24module_param(i2c_debug, int, 0644);25MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");26 27static unsigned int i2c_scan;28module_param(i2c_scan, int, 0444);29MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");30 31static unsigned int i2c_udelay = 5;32module_param(i2c_udelay, int, 0644);33MODULE_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 44static 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 else51 core->i2c_state &= ~0x02;52 cx_write(MO_I2C, core->i2c_state);53 cx_read(MO_I2C);54}55 56static 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 else63 core->i2c_state &= ~0x01;64 cx_write(MO_I2C, core->i2c_state);65 cx_read(MO_I2C);66}67 68static 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 77static 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 88static 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 99static 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 108static 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 */124int 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 = 4154 };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 } else170 pr_err("i2c register FAILED\n");171 172 return core->i2c_rc;173}174