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}
174