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 #include <media/v4l2-common.h>
29
30 #include <media/tuner.h>
31
32 static int debug; /* insmod parameter */
33 static int this_adap;
34
35 static struct i2c_client client_template;
36
37 /* Addresses to scan */
38 static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END };
39 static unsigned short ignore = I2C_CLIENT_END;
40
41 static struct i2c_client_address_data addr_data = {
42 .normal_i2c = normal_i2c,
43 .probe = &ignore,
44 .ignore = &ignore,
45 };
46
47 /* ---------------------------------------------------------------------- */
48
49 static unsigned char
50 tuner_getstatus (struct i2c_client *c)
51 {
52 unsigned char byte;
53 if (i2c_master_recv(c, &byte, 1) != 1)
54 printk(KERN_ERR "tuner-3036: I/O error.\n");
55 return byte;
56 }
57
58 #define TUNER_FL 0x80
59
60 static int
61 tuner_islocked (struct i2c_client *c)
62 {
63 return (tuner_getstatus(c) & TUNER_FL);
64 }
65
66 /* ---------------------------------------------------------------------- */
67
68 static void
69 set_tv_freq(struct i2c_client *c, int freq)
70 {
71 u16 div = ((freq * 20) / 16);
72 unsigned long give_up = jiffies + HZ;
73 unsigned char buffer[2];
74
75 if (debug)
76 printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
77
78 /* Select high tuning current */
79 buffer[0] = 0x29;
80 buffer[1] = 0x3e;
81
82 if (i2c_master_send(c, buffer, 2) != 2)
83 printk("tuner: i2c i/o error 1\n");
84
85 buffer[0] = 0x80 | ((div>>8) & 0x7f);
86 buffer[1] = div & 0xff;
87
88 if (i2c_master_send(c, buffer, 2) != 2)
89 printk("tuner: i2c i/o error 2\n");
90
91 while (!tuner_islocked(c) && time_before(jiffies, give_up))
92 schedule();
93
94 if (!tuner_islocked(c))
95 printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
96
97 /* Select low tuning current and engage AFC */
98 buffer[0] = 0x29;
99 buffer[1] = 0xb2;
100
101 if (i2c_master_send(c, buffer, 2) != 2)
102 printk("tuner: i2c i/o error 3\n");
103
104 if (debug)
105 printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
106 }
107
108 /* ---------------------------------------------------------------------- */
109
110 static int
111 tuner_attach(struct i2c_adapter *adap, int addr, int kind)
112 {
113 static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
114
115 struct i2c_client *client;
116
117 if (this_adap > 0)
118 return -1;
119 this_adap++;
120
121 client_template.adapter = adap;
122 client_template.addr = addr;
123
124 client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
125 if (client == NULL)
126 return -ENOMEM;
127 memcpy(client, &client_template, sizeof(struct i2c_client));
128
129 printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
130
131 i2c_attach_client(client);
132
133 if (i2c_master_send(client, buffer, 2) != 2)
134 printk("tuner: i2c i/o error 1\n");
135 if (i2c_master_send(client, buffer+2, 2) != 2)
136 printk("tuner: i2c i/o error 2\n");
137 if (i2c_master_send(client, buffer+4, 2) != 2)
138 printk("tuner: i2c i/o error 3\n");
139 return 0;
140 }
141
142 static int
143 tuner_detach(struct i2c_client *c)
144 {
145 return 0;
146 }
147
148 static int
149 tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
150 {
151 int *iarg = (int*)arg;
152
153 switch (cmd)
154 {
155 case VIDIOCSFREQ:
156 set_tv_freq(client, *iarg);
157 break;
158
159 default:
160 return -EINVAL;
161 }
162 return 0;
163 }
164
165 static int
166 tuner_probe(struct i2c_adapter *adap)
167 {
168 this_adap = 0;
169 if (adap->id == I2C_HW_B_LP)
170 return i2c_probe(adap, &addr_data, tuner_attach);
171 return 0;
172 }
173
174 /* ----------------------------------------------------------------------- */
175
176 static struct i2c_driver
177 i2c_driver_tuner =
178 {
179 .driver = {
180 .name = "sab3036",
181 },
182 .id = I2C_DRIVERID_SAB3036,
183 .attach_adapter = tuner_probe,
184 .detach_client = tuner_detach,
185 .command = tuner_command
186 };
187
188 static struct i2c_client client_template =
189 {
190 .driver = &i2c_driver_tuner,
191 .name = "SAB3036",
192 };
193
194 static int __init
195 tuner3036_init(void)
196 {
197 return i2c_add_driver(&i2c_driver_tuner);
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);
215
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