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
cx8800_bit_setscl(void * data,int state)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
cx8800_bit_setsda(void * data,int state)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
cx8800_bit_getscl(void * data)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
cx8800_bit_getsda(void * data)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
attach_inform(struct i2c_client * client)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 return 0;
107 }
108
detach_inform(struct i2c_client * client)109 static int detach_inform(struct i2c_client *client)
110 {
111 struct cx88_core *core = i2c_get_adapdata(client->adapter);
112
113 dprintk(1, "i2c detach [client=%s]\n", client->name);
114 return 0;
115 }
116
cx88_call_i2c_clients(struct cx88_core * core,unsigned int cmd,void * arg)117 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
118 {
119 if (0 != core->i2c_rc)
120 return;
121
122 if (core->gate_ctrl)
123 core->gate_ctrl(core, 1);
124
125 i2c_clients_command(&core->i2c_adap, cmd, arg);
126
127 if (core->gate_ctrl)
128 core->gate_ctrl(core, 0);
129 }
130
131 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
132 .setsda = cx8800_bit_setsda,
133 .setscl = cx8800_bit_setscl,
134 .getsda = cx8800_bit_getsda,
135 .getscl = cx8800_bit_getscl,
136 .udelay = 16,
137 .timeout = 200,
138 };
139
140 /* ----------------------------------------------------------------------- */
141
142 static char *i2c_devs[128] = {
143 [ 0x1c >> 1 ] = "lgdt330x",
144 [ 0x86 >> 1 ] = "tda9887/cx22702",
145 [ 0xa0 >> 1 ] = "eeprom",
146 [ 0xc0 >> 1 ] = "tuner (analog)",
147 [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
148 [ 0xc8 >> 1 ] = "xc5000",
149 };
150
do_i2c_scan(char * name,struct i2c_client * c)151 static void do_i2c_scan(char *name, struct i2c_client *c)
152 {
153 unsigned char buf;
154 int i,rc;
155
156 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
157 c->addr = i;
158 rc = i2c_master_recv(c,&buf,0);
159 if (rc < 0)
160 continue;
161 printk("%s: i2c scan: found device @ 0x%x [%s]\n",
162 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
163 }
164 }
165
166 /* init + register i2c algo-bit adapter */
cx88_i2c_init(struct cx88_core * core,struct pci_dev * pci)167 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
168 {
169 /* Prevents usage of invalid delay values */
170 if (i2c_udelay<5)
171 i2c_udelay=5;
172
173 memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
174 sizeof(core->i2c_algo));
175
176 if (core->board.tuner_type != TUNER_ABSENT)
177 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
178 if (core->board.mpeg & CX88_MPEG_DVB)
179 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
180
181 core->i2c_adap.dev.parent = &pci->dev;
182 strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
183 core->i2c_adap.owner = THIS_MODULE;
184 core->i2c_adap.id = I2C_HW_B_CX2388x;
185 core->i2c_adap.client_register = attach_inform;
186 core->i2c_adap.client_unregister = detach_inform;
187 core->i2c_algo.udelay = i2c_udelay;
188 core->i2c_algo.data = core;
189 i2c_set_adapdata(&core->i2c_adap,core);
190 core->i2c_adap.algo_data = &core->i2c_algo;
191 core->i2c_client.adapter = &core->i2c_adap;
192 strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
193
194 cx8800_bit_setscl(core,1);
195 cx8800_bit_setsda(core,1);
196
197 core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
198 if (0 == core->i2c_rc) {
199 static u8 tuner_data[] =
200 { 0x0b, 0xdc, 0x86, 0x52 };
201 static struct i2c_msg tuner_msg =
202 { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 };
203
204 dprintk(1, "i2c register ok\n");
205 switch( core->boardnr ) {
206 case CX88_BOARD_HAUPPAUGE_HVR1300:
207 case CX88_BOARD_HAUPPAUGE_HVR3000:
208 case CX88_BOARD_HAUPPAUGE_HVR4000:
209 printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n",
210 core->name);
211 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
212 break;
213 default:
214 break;
215 }
216 if (i2c_scan)
217 do_i2c_scan(core->name,&core->i2c_client);
218 } else
219 printk("%s: i2c register FAILED\n", core->name);
220 return core->i2c_rc;
221 }
222
223 /* ----------------------------------------------------------------------- */
224
225 EXPORT_SYMBOL(cx88_call_i2c_clients);
226
227 /*
228 * Local variables:
229 * c-basic-offset: 8
230 * End:
231 */
232