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(client: c, buf: &buf, count: 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(adap: &core->i2c_adap, data: &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(data: core, state: 1); |
143 | cx8800_bit_setsda(data: core, state: 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(adap: core->i2c_client.adapter, msgs: &tuner_msg, num: 1); |
163 | break; |
164 | default: |
165 | break; |
166 | } |
167 | if (i2c_scan) |
168 | do_i2c_scan(name: core->name, c: &core->i2c_client); |
169 | } else |
170 | pr_err("i2c register FAILED\n" ); |
171 | |
172 | return core->i2c_rc; |
173 | } |
174 | |