xref: /openbmc/linux/drivers/media/pci/cx88/cx88-i2c.c (revision 151f4e2b)
1 
2 /*
3  *
4  * cx88-i2c.c  --  all the i2c code is here
5  *
6  * Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
7  *			   & Marcus Metzler (mocm@thp.uni-koeln.de)
8  * (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
9  * (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
10  *
11  * (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org>
12  *	- Multituner support and i2c address binding
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  */
24 
25 #include "cx88.h"
26 
27 #include <linux/init.h>
28 #include <linux/io.h>
29 #include <linux/module.h>
30 
31 #include <media/v4l2-common.h>
32 
33 static unsigned int i2c_debug;
34 module_param(i2c_debug, int, 0644);
35 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
36 
37 static unsigned int i2c_scan;
38 module_param(i2c_scan, int, 0444);
39 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
40 
41 static unsigned int i2c_udelay = 5;
42 module_param(i2c_udelay, int, 0644);
43 MODULE_PARM_DESC(i2c_udelay,
44 		 "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed.");
45 
46 #define dprintk(level, fmt, arg...) do {				\
47 	if (i2c_debug >= level)						\
48 		printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt),		\
49 			__func__, ##arg);				\
50 } while (0)
51 
52 /* ----------------------------------------------------------------------- */
53 
54 static void cx8800_bit_setscl(void *data, int state)
55 {
56 	struct cx88_core *core = data;
57 
58 	if (state)
59 		core->i2c_state |= 0x02;
60 	else
61 		core->i2c_state &= ~0x02;
62 	cx_write(MO_I2C, core->i2c_state);
63 	cx_read(MO_I2C);
64 }
65 
66 static void cx8800_bit_setsda(void *data, int state)
67 {
68 	struct cx88_core *core = data;
69 
70 	if (state)
71 		core->i2c_state |= 0x01;
72 	else
73 		core->i2c_state &= ~0x01;
74 	cx_write(MO_I2C, core->i2c_state);
75 	cx_read(MO_I2C);
76 }
77 
78 static int cx8800_bit_getscl(void *data)
79 {
80 	struct cx88_core *core = data;
81 	u32 state;
82 
83 	state = cx_read(MO_I2C);
84 	return state & 0x02 ? 1 : 0;
85 }
86 
87 static int cx8800_bit_getsda(void *data)
88 {
89 	struct cx88_core *core = data;
90 	u32 state;
91 
92 	state = cx_read(MO_I2C);
93 	return state & 0x01;
94 }
95 
96 /* ----------------------------------------------------------------------- */
97 
98 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
99 	.setsda  = cx8800_bit_setsda,
100 	.setscl  = cx8800_bit_setscl,
101 	.getsda  = cx8800_bit_getsda,
102 	.getscl  = cx8800_bit_getscl,
103 	.udelay  = 16,
104 	.timeout = 200,
105 };
106 
107 /* ----------------------------------------------------------------------- */
108 
109 static const char * const i2c_devs[128] = {
110 	[0x1c >> 1] = "lgdt330x",
111 	[0x86 >> 1] = "tda9887/cx22702",
112 	[0xa0 >> 1] = "eeprom",
113 	[0xc0 >> 1] = "tuner (analog)",
114 	[0xc2 >> 1] = "tuner (analog/dvb)",
115 	[0xc8 >> 1] = "xc5000",
116 };
117 
118 static void do_i2c_scan(const char *name, struct i2c_client *c)
119 {
120 	unsigned char buf;
121 	int i, rc;
122 
123 	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
124 		c->addr = i;
125 		rc = i2c_master_recv(c, &buf, 0);
126 		if (rc < 0)
127 			continue;
128 		pr_info("i2c scan: found device @ 0x%x  [%s]\n",
129 			i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
130 	}
131 }
132 
133 /* init + register i2c adapter */
134 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
135 {
136 	/* Prevents usage of invalid delay values */
137 	if (i2c_udelay < 5)
138 		i2c_udelay = 5;
139 
140 	core->i2c_algo = cx8800_i2c_algo_template;
141 
142 	core->i2c_adap.dev.parent = &pci->dev;
143 	strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name));
144 	core->i2c_adap.owner = THIS_MODULE;
145 	core->i2c_algo.udelay = i2c_udelay;
146 	core->i2c_algo.data = core;
147 	i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
148 	core->i2c_adap.algo_data = &core->i2c_algo;
149 	core->i2c_client.adapter = &core->i2c_adap;
150 	strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
151 
152 	cx8800_bit_setscl(core, 1);
153 	cx8800_bit_setsda(core, 1);
154 
155 	core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
156 	if (core->i2c_rc == 0) {
157 		static u8 tuner_data[] = {
158 			0x0b, 0xdc, 0x86, 0x52 };
159 		static struct i2c_msg tuner_msg = {
160 			.flags = 0,
161 			.addr = 0xc2 >> 1,
162 			.buf = tuner_data,
163 			.len = 4
164 		};
165 
166 		dprintk(1, "i2c register ok\n");
167 		switch (core->boardnr) {
168 		case CX88_BOARD_HAUPPAUGE_HVR1300:
169 		case CX88_BOARD_HAUPPAUGE_HVR3000:
170 		case CX88_BOARD_HAUPPAUGE_HVR4000:
171 			pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n");
172 			i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
173 			break;
174 		default:
175 			break;
176 		}
177 		if (i2c_scan)
178 			do_i2c_scan(core->name, &core->i2c_client);
179 	} else
180 		pr_err("i2c register FAILED\n");
181 
182 	return core->i2c_rc;
183 }
184