Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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 int attach_inform(struct i2c_client *client)
101 {
102         struct cx88_core *core = i2c_get_adapdata(client->adapter);
103
104         dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
105                 client->driver->driver.name, client->addr, client->name);
106
107         return 0;
108 }
109
110 static int detach_inform(struct i2c_client *client)
111 {
112         struct cx88_core *core = i2c_get_adapdata(client->adapter);
113
114         dprintk(1, "i2c detach [client=%s]\n", client->name);
115         return 0;
116 }
117
118 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
119 {
120         if (0 != core->i2c_rc)
121                 return;
122
123 #if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
124         if ( (core->dvbdev) && (core->dvbdev->dvb.frontend) ) {
125                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
126                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 1);
127
128                 i2c_clients_command(&core->i2c_adap, cmd, arg);
129
130                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
131                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 0);
132         } else
133 #endif
134                 i2c_clients_command(&core->i2c_adap, cmd, arg);
135 }
136
137 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
138         .setsda  = cx8800_bit_setsda,
139         .setscl  = cx8800_bit_setscl,
140         .getsda  = cx8800_bit_getsda,
141         .getscl  = cx8800_bit_getscl,
142         .udelay  = 16,
143         .timeout = 200,
144 };
145
146 /* ----------------------------------------------------------------------- */
147
148 static char *i2c_devs[128] = {
149         [ 0x1c >> 1 ] = "lgdt330x",
150         [ 0x86 >> 1 ] = "tda9887/cx22702",
151         [ 0xa0 >> 1 ] = "eeprom",
152         [ 0xc0 >> 1 ] = "tuner (analog)",
153         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
154         [ 0xc8 >> 1 ] = "xc5000",
155 };
156
157 static void do_i2c_scan(char *name, struct i2c_client *c)
158 {
159         unsigned char buf;
160         int i,rc;
161
162         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
163                 c->addr = i;
164                 rc = i2c_master_recv(c,&buf,0);
165                 if (rc < 0)
166                         continue;
167                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
168                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
169         }
170 }
171
172 /* init + register i2c algo-bit adapter */
173 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
174 {
175         /* Prevents usage of invalid delay values */
176         if (i2c_udelay<5)
177                 i2c_udelay=5;
178
179         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
180                sizeof(core->i2c_algo));
181
182         if (core->board.tuner_type != TUNER_ABSENT)
183                 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
184         if (core->board.mpeg & CX88_MPEG_DVB)
185                 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
186
187         core->i2c_adap.dev.parent = &pci->dev;
188         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
189         core->i2c_adap.owner = THIS_MODULE;
190         core->i2c_adap.id = I2C_HW_B_CX2388x;
191         core->i2c_adap.client_register = attach_inform;
192         core->i2c_adap.client_unregister = detach_inform;
193         core->i2c_algo.udelay = i2c_udelay;
194         core->i2c_algo.data = core;
195         i2c_set_adapdata(&core->i2c_adap,core);
196         core->i2c_adap.algo_data = &core->i2c_algo;
197         core->i2c_client.adapter = &core->i2c_adap;
198         strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
199
200         cx8800_bit_setscl(core,1);
201         cx8800_bit_setsda(core,1);
202
203         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
204         if (0 == core->i2c_rc) {
205                 dprintk(1, "i2c register ok\n");
206                 if (i2c_scan)
207                         do_i2c_scan(core->name,&core->i2c_client);
208         } else
209                 printk("%s: i2c register FAILED\n", core->name);
210         return core->i2c_rc;
211 }
212
213 /* ----------------------------------------------------------------------- */
214
215 EXPORT_SYMBOL(cx88_call_i2c_clients);
216
217 /*
218  * Local variables:
219  * c-basic-offset: 8
220  * End:
221  */