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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/video/tuner-3036.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/media/video/tuner-3036.c')
-rw-r--r--drivers/media/video/tuner-3036.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/media/video/tuner-3036.c b/drivers/media/video/tuner-3036.c
new file mode 100644
index 000000000000..6b20aa902a8f
--- /dev/null
+++ b/drivers/media/video/tuner-3036.c
@@ -0,0 +1,220 @@
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
31static int debug; /* insmod parameter */
32static int this_adap;
33
34static struct i2c_client client_template;
35
36/* Addresses to scan */
37static unsigned short normal_i2c[] = {I2C_CLIENT_END};
38static unsigned short normal_i2c_range[] = {0x60, 0x61, I2C_CLIENT_END};
39static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
40static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
41static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
42static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
43static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
44
45static struct i2c_client_address_data addr_data = {
46 normal_i2c, normal_i2c_range,
47 probe, probe_range,
48 ignore, ignore_range,
49 force
50};
51
52/* ---------------------------------------------------------------------- */
53
54static unsigned char
55tuner_getstatus (struct i2c_client *c)
56{
57 unsigned char byte;
58 if (i2c_master_recv(c, &byte, 1) != 1)
59 printk(KERN_ERR "tuner-3036: I/O error.\n");
60 return byte;
61}
62
63#define TUNER_FL 0x80
64
65static int
66tuner_islocked (struct i2c_client *c)
67{
68 return (tuner_getstatus(c) & TUNER_FL);
69}
70
71/* ---------------------------------------------------------------------- */
72
73static void
74set_tv_freq(struct i2c_client *c, int freq)
75{
76 u16 div = ((freq * 20) / 16);
77 unsigned long give_up = jiffies + HZ;
78 unsigned char buffer[2];
79
80 if (debug)
81 printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
82
83 /* Select high tuning current */
84 buffer[0] = 0x29;
85 buffer[1] = 0x3e;
86
87 if (i2c_master_send(c, buffer, 2) != 2)
88 printk("tuner: i2c i/o error 1\n");
89
90 buffer[0] = 0x80 | ((div>>8) & 0x7f);
91 buffer[1] = div & 0xff;
92
93 if (i2c_master_send(c, buffer, 2) != 2)
94 printk("tuner: i2c i/o error 2\n");
95
96 while (!tuner_islocked(c) && time_before(jiffies, give_up))
97 schedule();
98
99 if (!tuner_islocked(c))
100 printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
101
102 /* Select low tuning current and engage AFC */
103 buffer[0] = 0x29;
104 buffer[1] = 0xb2;
105
106 if (i2c_master_send(c, buffer, 2) != 2)
107 printk("tuner: i2c i/o error 3\n");
108
109 if (debug)
110 printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
111}
112
113/* ---------------------------------------------------------------------- */
114
115static int
116tuner_attach(struct i2c_adapter *adap, int addr, int kind)
117{
118 static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
119
120 struct i2c_client *client;
121
122 if (this_adap > 0)
123 return -1;
124 this_adap++;
125
126 client_template.adapter = adap;
127 client_template.addr = addr;
128
129 client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
130 if (client == NULL)
131 return -ENOMEM;
132 memcpy(client, &client_template, sizeof(struct i2c_client));
133
134 printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
135
136 i2c_attach_client(client);
137
138 if (i2c_master_send(client, buffer, 2) != 2)
139 printk("tuner: i2c i/o error 1\n");
140 if (i2c_master_send(client, buffer+2, 2) != 2)
141 printk("tuner: i2c i/o error 2\n");
142 if (i2c_master_send(client, buffer+4, 2) != 2)
143 printk("tuner: i2c i/o error 3\n");
144 return 0;
145}
146
147static int
148tuner_detach(struct i2c_client *c)
149{
150 return 0;
151}
152
153static int
154tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
155{
156 int *iarg = (int*)arg;
157
158 switch (cmd)
159 {
160 case TUNER_SET_TVFREQ:
161 set_tv_freq(client, *iarg);
162 break;
163
164 default:
165 return -EINVAL;
166 }
167 return 0;
168}
169
170static int
171tuner_probe(struct i2c_adapter *adap)
172{
173 this_adap = 0;
174 if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_LP))
175 return i2c_probe(adap, &addr_data, tuner_attach);
176 return 0;
177}
178
179/* ----------------------------------------------------------------------- */
180
181static struct i2c_driver
182i2c_driver_tuner =
183{
184 .owner = THIS_MODULE,
185 .name = "sab3036",
186 .id = I2C_DRIVERID_SAB3036,
187 .flags = I2C_DF_NOTIFY,
188 .attach_adapter = tuner_probe,
189 .detach_client = tuner_detach,
190 .command = tuner_command
191};
192
193static struct i2c_client client_template =
194{
195 .driver = &i2c_driver_tuner,
196 .name = "SAB3036",
197};
198
199static int __init
200tuner3036_init(void)
201{
202 i2c_add_driver(&i2c_driver_tuner);
203 return 0;
204}
205
206static void __exit
207tuner3036_exit(void)
208{
209 i2c_del_driver(&i2c_driver_tuner);
210}
211
212MODULE_DESCRIPTION("SAB3036 tuner driver");
213MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
214MODULE_LICENSE("GPL");
215
216module_param(debug, int, 0);
217MODULE_PARM_DESC(debug,"Enable debugging output");
218
219module_init(tuner3036_init);
220module_exit(tuner3036_exit);