f53836bb6a5a1322753d0e3938251be9fb791ba9
[linux-2.6.git] / drivers / media / video / cx88 / cx88-i2c.c
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@infradead.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     You should have received a copy of the GNU General Public License
25     along with this program; if not, write to the Free Software
26     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27
28 */
29
30 #include <linux/module.h>
31 #include <linux/init.h>
32
33 #include <asm/io.h>
34
35 #include "cx88.h"
36 #include <media/v4l2-common.h>
37
38 static unsigned int i2c_debug;
39 module_param(i2c_debug, int, 0644);
40 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
41
42 static unsigned int i2c_scan;
43 module_param(i2c_scan, int, 0444);
44 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
45
46 static unsigned int i2c_udelay = 5;
47 module_param(i2c_udelay, int, 0644);
48 MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
49                 "(should be 5 or higher). Lower value means higher bus speed.");
50
51 #define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
52         printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
53
54 /* ----------------------------------------------------------------------- */
55
56 static void cx8800_bit_setscl(void *data, int state)
57 {
58         struct cx88_core *core = data;
59
60         if (state)
61                 core->i2c_state |= 0x02;
62         else
63                 core->i2c_state &= ~0x02;
64         cx_write(MO_I2C, core->i2c_state);
65         cx_read(MO_I2C);
66 }
67
68 static void cx8800_bit_setsda(void *data, int state)
69 {
70         struct cx88_core *core = data;
71
72         if (state)
73                 core->i2c_state |= 0x01;
74         else
75                 core->i2c_state &= ~0x01;
76         cx_write(MO_I2C, core->i2c_state);
77         cx_read(MO_I2C);
78 }
79
80 static int cx8800_bit_getscl(void *data)
81 {
82         struct cx88_core *core = data;
83         u32 state;
84
85         state = cx_read(MO_I2C);
86         return state & 0x02 ? 1 : 0;
87 }
88
89 static int cx8800_bit_getsda(void *data)
90 {
91         struct cx88_core *core = data;
92         u32 state;
93
94         state = cx_read(MO_I2C);
95         return state & 0x01;
96 }
97
98 /* ----------------------------------------------------------------------- */
99
100 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
101         .setsda  = cx8800_bit_setsda,
102         .setscl  = cx8800_bit_setscl,
103         .getsda  = cx8800_bit_getsda,
104         .getscl  = cx8800_bit_getscl,
105         .udelay  = 16,
106         .timeout = 200,
107 };
108
109 /* ----------------------------------------------------------------------- */
110
111 static const char * const i2c_devs[128] = {
112         [ 0x1c >> 1 ] = "lgdt330x",
113         [ 0x86 >> 1 ] = "tda9887/cx22702",
114         [ 0xa0 >> 1 ] = "eeprom",
115         [ 0xc0 >> 1 ] = "tuner (analog)",
116         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
117         [ 0xc8 >> 1 ] = "xc5000",
118 };
119
120 static void do_i2c_scan(const char *name, struct i2c_client *c)
121 {
122         unsigned char buf;
123         int i,rc;
124
125         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
126                 c->addr = i;
127                 rc = i2c_master_recv(c,&buf,0);
128                 if (rc < 0)
129                         continue;
130                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
131                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
132         }
133 }
134
135 /* init + register i2c algo-bit adapter */
136 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
137 {
138         /* Prevents usage of invalid delay values */
139         if (i2c_udelay<5)
140                 i2c_udelay=5;
141
142         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
143                sizeof(core->i2c_algo));
144
145
146         core->i2c_adap.dev.parent = &pci->dev;
147         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
148         core->i2c_adap.owner = THIS_MODULE;
149         core->i2c_adap.id = I2C_HW_B_CX2388x;
150         core->i2c_algo.udelay = i2c_udelay;
151         core->i2c_algo.data = core;
152         i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
153         core->i2c_adap.algo_data = &core->i2c_algo;
154         core->i2c_client.adapter = &core->i2c_adap;
155         strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
156
157         cx8800_bit_setscl(core,1);
158         cx8800_bit_setsda(core,1);
159
160         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
161         if (0 == core->i2c_rc) {
162                 static u8 tuner_data[] =
163                         { 0x0b, 0xdc, 0x86, 0x52 };
164                 static struct i2c_msg tuner_msg =
165                         { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 };
166
167                 dprintk(1, "i2c register ok\n");
168                 switch( core->boardnr ) {
169                         case CX88_BOARD_HAUPPAUGE_HVR1300:
170                         case CX88_BOARD_HAUPPAUGE_HVR3000:
171                         case CX88_BOARD_HAUPPAUGE_HVR4000:
172                                 printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n",
173                                         core->name);
174                                 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
175                                 break;
176                         default:
177                                 break;
178                 }
179                 if (i2c_scan)
180                         do_i2c_scan(core->name,&core->i2c_client);
181         } else
182                 printk("%s: i2c register FAILED\n", core->name);
183
184         return core->i2c_rc;
185 }