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
cx8800_bit_setscl(void * data,int state)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
cx8800_bit_setsda(void * data,int state)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
cx8800_bit_getscl(void * data)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
cx8800_bit_getsda(void * data)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
do_i2c_scan(const char * name,struct i2c_client * c)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 */
cx88_i2c_init(struct cx88_core * core,struct pci_dev * pci)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 }
174