V4L/DVB (5479): Use ARRAY_SIZE instead of a magic number
[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/moduleparam.h>
32 #include <linux/init.h>
33
34 #include <asm/io.h>
35
36 #include "cx88.h"
37 #include <media/v4l2-common.h>
38
39 static unsigned int i2c_debug = 0;
40 module_param(i2c_debug, int, 0644);
41 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
42
43 static unsigned int i2c_scan = 0;
44 module_param(i2c_scan, int, 0444);
45 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
46
47 static unsigned int i2c_udelay = 5;
48 module_param(i2c_udelay, int, 0644);
49 MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
50                 "(should be 5 or higher). Lower value means higher bus speed.");
51
52 #define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
53         printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
54
55 /* ----------------------------------------------------------------------- */
56
57 static void cx8800_bit_setscl(void *data, int state)
58 {
59         struct cx88_core *core = data;
60
61         if (state)
62                 core->i2c_state |= 0x02;
63         else
64                 core->i2c_state &= ~0x02;
65         cx_write(MO_I2C, core->i2c_state);
66         cx_read(MO_I2C);
67 }
68
69 static void cx8800_bit_setsda(void *data, int state)
70 {
71         struct cx88_core *core = data;
72
73         if (state)
74                 core->i2c_state |= 0x01;
75         else
76                 core->i2c_state &= ~0x01;
77         cx_write(MO_I2C, core->i2c_state);
78         cx_read(MO_I2C);
79 }
80
81 static int cx8800_bit_getscl(void *data)
82 {
83         struct cx88_core *core = data;
84         u32 state;
85
86         state = cx_read(MO_I2C);
87         return state & 0x02 ? 1 : 0;
88 }
89
90 static int cx8800_bit_getsda(void *data)
91 {
92         struct cx88_core *core = data;
93         u32 state;
94
95         state = cx_read(MO_I2C);
96         return state & 0x01;
97 }
98
99 /* ----------------------------------------------------------------------- */
100
101 static int attach_inform(struct i2c_client *client)
102 {
103         struct tuner_setup tun_setup;
104         struct cx88_core *core = i2c_get_adapdata(client->adapter);
105
106         dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
107                 client->driver->driver.name, client->addr, client->name);
108         if (!client->driver->command)
109                 return 0;
110
111         if (core->radio_type != UNSET) {
112                 if ((core->radio_addr==ADDR_UNSET)||(core->radio_addr==client->addr)) {
113                         tun_setup.mode_mask = T_RADIO;
114                         tun_setup.type = core->radio_type;
115                         tun_setup.addr = core->radio_addr;
116
117                         client->driver->command (client, TUNER_SET_TYPE_ADDR, &tun_setup);
118                 }
119         }
120         if (core->tuner_type != UNSET) {
121                 if ((core->tuner_addr==ADDR_UNSET)||(core->tuner_addr==client->addr)) {
122
123                         tun_setup.mode_mask = T_ANALOG_TV;
124                         tun_setup.type = core->tuner_type;
125                         tun_setup.addr = core->tuner_addr;
126
127                         client->driver->command (client,TUNER_SET_TYPE_ADDR, &tun_setup);
128                 }
129         }
130
131         if (core->tda9887_conf)
132                 client->driver->command(client, TDA9887_SET_CONFIG, &core->tda9887_conf);
133         return 0;
134 }
135
136 static int detach_inform(struct i2c_client *client)
137 {
138         struct cx88_core *core = i2c_get_adapdata(client->adapter);
139
140         dprintk(1, "i2c detach [client=%s]\n", client->name);
141         return 0;
142 }
143
144 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
145 {
146         if (0 != core->i2c_rc)
147                 return;
148
149 #if defined(CONFIG_VIDEO_BUF_DVB) || defined(CONFIG_VIDEO_BUF_DVB_MODULE)
150         if ( (core->dvbdev) && (core->dvbdev->dvb.frontend) ) {
151                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
152                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 1);
153
154                 i2c_clients_command(&core->i2c_adap, cmd, arg);
155
156                 if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
157                         core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 0);
158         } else
159 #endif
160                 i2c_clients_command(&core->i2c_adap, cmd, arg);
161 }
162
163 static struct i2c_algo_bit_data cx8800_i2c_algo_template = {
164         .setsda  = cx8800_bit_setsda,
165         .setscl  = cx8800_bit_setscl,
166         .getsda  = cx8800_bit_getsda,
167         .getscl  = cx8800_bit_getscl,
168         .udelay  = 16,
169         .timeout = 200,
170 };
171
172 /* ----------------------------------------------------------------------- */
173
174 static struct i2c_adapter cx8800_i2c_adap_template = {
175         .name              = "cx2388x",
176         .owner             = THIS_MODULE,
177         .id                = I2C_HW_B_CX2388x,
178         .client_register   = attach_inform,
179         .client_unregister = detach_inform,
180 };
181
182 static struct i2c_client cx8800_i2c_client_template = {
183         .name   = "cx88xx internal",
184 };
185
186 static char *i2c_devs[128] = {
187         [ 0x1c >> 1 ] = "lgdt330x",
188         [ 0x86 >> 1 ] = "tda9887/cx22702",
189         [ 0xa0 >> 1 ] = "eeprom",
190         [ 0xc0 >> 1 ] = "tuner (analog)",
191         [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
192 };
193
194 static void do_i2c_scan(char *name, struct i2c_client *c)
195 {
196         unsigned char buf;
197         int i,rc;
198
199         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
200                 c->addr = i;
201                 rc = i2c_master_recv(c,&buf,0);
202                 if (rc < 0)
203                         continue;
204                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
205                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
206         }
207 }
208
209 /* init + register i2c algo-bit adapter */
210 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
211 {
212         /* Prevents usage of invalid delay values */
213         if (i2c_udelay<5)
214                 i2c_udelay=5;
215         cx8800_i2c_algo_template.udelay=i2c_udelay;
216
217         memcpy(&core->i2c_adap, &cx8800_i2c_adap_template,
218                sizeof(core->i2c_adap));
219         memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
220                sizeof(core->i2c_algo));
221         memcpy(&core->i2c_client, &cx8800_i2c_client_template,
222                sizeof(core->i2c_client));
223
224         if (core->tuner_type != TUNER_ABSENT)
225                 core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
226         if (cx88_boards[core->board].mpeg & CX88_MPEG_DVB)
227                 core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
228
229         core->i2c_adap.dev.parent = &pci->dev;
230         strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
231         core->i2c_algo.data = core;
232         i2c_set_adapdata(&core->i2c_adap,core);
233         core->i2c_adap.algo_data = &core->i2c_algo;
234         core->i2c_client.adapter = &core->i2c_adap;
235
236         cx8800_bit_setscl(core,1);
237         cx8800_bit_setsda(core,1);
238
239         core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
240         if (0 == core->i2c_rc) {
241                 dprintk(1, "i2c register ok\n");
242                 if (i2c_scan)
243                         do_i2c_scan(core->name,&core->i2c_client);
244         } else
245                 printk("%s: i2c register FAILED\n", core->name);
246         return core->i2c_rc;
247 }
248
249 /* ----------------------------------------------------------------------- */
250
251 EXPORT_SYMBOL(cx88_call_i2c_clients);
252
253 /*
254  * Local variables:
255  * c-basic-offset: 8
256  * End:
257  */