cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cx88-i2c.c (4347B)

      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
     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	else
     51		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	else
     63		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 = 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}