79203595b9c13456d09c7c700b3127f16ed52734
[linux-2.6.git] / drivers / media / video / tuner-3036.c
1 /*
2  * Driver for Philips SAB3036 "CITAC" tuner control chip.
3  *
4  * Author: Phil Blundell <philb@gnu.org>
5  *
6  * The SAB3036 is just about different enough from the chips that
7  * tuner.c copes with to make it not worth the effort to crowbar
8  * the support into that file.  So instead we have a separate driver. 
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version
13  * 2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/string.h>
20 #include <linux/timer.h>
21 #include <linux/delay.h>
22 #include <linux/errno.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25
26 #include <linux/i2c.h>
27 #include <linux/videodev.h>
28
29 #include <media/tuner.h>
30
31 static int debug;       /* insmod parameter */
32 static int this_adap;
33
34 static struct i2c_client client_template;
35
36 /* Addresses to scan */
37 static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END };
38 static unsigned short ignore = I2C_CLIENT_END;
39
40 static struct i2c_client_address_data addr_data = {
41         .normal_i2c     = normal_i2c,
42         .probe          = &ignore,
43         .ignore         = &ignore,
44 };
45
46 /* ---------------------------------------------------------------------- */
47
48 static unsigned char
49 tuner_getstatus (struct i2c_client *c)
50 {
51         unsigned char byte;
52         if (i2c_master_recv(c, &byte, 1) != 1)
53                 printk(KERN_ERR "tuner-3036: I/O error.\n");
54         return byte;
55 }
56
57 #define TUNER_FL        0x80
58
59 static int 
60 tuner_islocked (struct i2c_client *c)
61 {
62         return (tuner_getstatus(c) & TUNER_FL);
63 }
64
65 /* ---------------------------------------------------------------------- */
66
67 static void 
68 set_tv_freq(struct i2c_client *c, int freq)
69 {
70         u16 div = ((freq * 20) / 16);
71         unsigned long give_up = jiffies + HZ;
72         unsigned char buffer[2];
73
74         if (debug)
75                 printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
76         
77         /* Select high tuning current */
78         buffer[0] = 0x29;
79         buffer[1] = 0x3e;
80
81         if (i2c_master_send(c, buffer, 2) != 2)
82                 printk("tuner: i2c i/o error 1\n");
83         
84         buffer[0] = 0x80 | ((div>>8) & 0x7f);
85         buffer[1] = div & 0xff;
86
87         if (i2c_master_send(c, buffer, 2) != 2)
88                 printk("tuner: i2c i/o error 2\n");
89         
90         while (!tuner_islocked(c) && time_before(jiffies, give_up))
91                 schedule();
92                
93         if (!tuner_islocked(c))
94                 printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
95         
96         /* Select low tuning current and engage AFC */
97         buffer[0] = 0x29;
98         buffer[1] = 0xb2;
99
100         if (i2c_master_send(c, buffer, 2) != 2)
101                 printk("tuner: i2c i/o error 3\n");
102
103         if (debug)
104                 printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
105 }
106
107 /* ---------------------------------------------------------------------- */
108
109 static int 
110 tuner_attach(struct i2c_adapter *adap, int addr, int kind)
111 {
112         static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
113
114         struct i2c_client *client;
115
116         if (this_adap > 0)
117                 return -1;
118         this_adap++;
119         
120         client_template.adapter = adap;
121         client_template.addr = addr;
122
123         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
124         if (client == NULL)
125                 return -ENOMEM;
126         memcpy(client, &client_template, sizeof(struct i2c_client));
127
128         printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
129
130         i2c_attach_client(client);
131
132         if (i2c_master_send(client, buffer, 2) != 2)
133                 printk("tuner: i2c i/o error 1\n");
134         if (i2c_master_send(client, buffer+2, 2) != 2)
135                 printk("tuner: i2c i/o error 2\n");
136         if (i2c_master_send(client, buffer+4, 2) != 2)
137                 printk("tuner: i2c i/o error 3\n");
138         return 0;
139 }
140
141 static int 
142 tuner_detach(struct i2c_client *c)
143 {
144         return 0;
145 }
146
147 static int 
148 tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
149 {
150         int *iarg = (int*)arg;
151
152         switch (cmd) 
153         {
154                 case VIDIOCSFREQ:
155                         set_tv_freq(client, *iarg);
156                         break;
157             
158                 default:
159                         return -EINVAL;
160         }
161         return 0;
162 }
163
164 static int 
165 tuner_probe(struct i2c_adapter *adap)
166 {
167         this_adap = 0;
168         if (adap->id == I2C_HW_B_LP)
169                 return i2c_probe(adap, &addr_data, tuner_attach);
170         return 0;
171 }
172
173 /* ----------------------------------------------------------------------- */
174
175 static struct i2c_driver 
176 i2c_driver_tuner = 
177 {
178         .owner          =       THIS_MODULE,
179         .name           =       "sab3036",
180         .id             =       I2C_DRIVERID_SAB3036,
181         .flags          =       I2C_DF_NOTIFY,
182         .attach_adapter =       tuner_probe,
183         .detach_client  =       tuner_detach,
184         .command        =       tuner_command
185 };
186
187 static struct i2c_client client_template =
188 {
189         .driver         = &i2c_driver_tuner,
190         .name           = "SAB3036",
191 };
192
193 static int __init
194 tuner3036_init(void)
195 {
196         i2c_add_driver(&i2c_driver_tuner);
197         return 0;
198 }
199
200 static void __exit
201 tuner3036_exit(void)
202 {
203         i2c_del_driver(&i2c_driver_tuner);
204 }
205
206 MODULE_DESCRIPTION("SAB3036 tuner driver");
207 MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
208 MODULE_LICENSE("GPL");
209
210 module_param(debug, int, 0);
211 MODULE_PARM_DESC(debug,"Enable debugging output");
212
213 module_init(tuner3036_init);
214 module_exit(tuner3036_exit);