2 * Driver for Philips SAB3036 "CITAC" tuner control chip.
4 * Author: Phil Blundell <philb@gnu.org>
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.
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.
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/version.h>
25 #include <linux/init.h>
27 #include <linux/i2c.h>
28 #include <linux/videodev.h>
32 static int debug; /* insmod parameter */
35 static struct i2c_client client_template;
37 /* Addresses to scan */
38 static unsigned short normal_i2c[] = {I2C_CLIENT_END};
39 static unsigned short normal_i2c_range[] = {0x60, 0x61, I2C_CLIENT_END};
40 static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
41 static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
42 static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
43 static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
44 static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
46 static struct i2c_client_address_data addr_data = {
47 normal_i2c, normal_i2c_range,
53 /* ---------------------------------------------------------------------- */
56 tuner_getstatus (struct i2c_client *c)
59 if (i2c_master_recv(c, &byte, 1) != 1)
60 printk(KERN_ERR "tuner-3036: I/O error.\n");
67 tuner_islocked (struct i2c_client *c)
69 return (tuner_getstatus(c) & TUNER_FL);
72 /* ---------------------------------------------------------------------- */
75 set_tv_freq(struct i2c_client *c, int freq)
77 u16 div = ((freq * 20) / 16);
78 unsigned long give_up = jiffies + HZ;
79 unsigned char buffer[2];
82 printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
84 /* Select high tuning current */
88 if (i2c_master_send(c, buffer, 2) != 2)
89 printk("tuner: i2c i/o error 1\n");
91 buffer[0] = 0x80 | ((div>>8) & 0x7f);
92 buffer[1] = div & 0xff;
94 if (i2c_master_send(c, buffer, 2) != 2)
95 printk("tuner: i2c i/o error 2\n");
97 while (!tuner_islocked(c) && time_before(jiffies, give_up))
100 if (!tuner_islocked(c))
101 printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
103 /* Select low tuning current and engage AFC */
107 if (i2c_master_send(c, buffer, 2) != 2)
108 printk("tuner: i2c i/o error 3\n");
111 printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
114 /* ---------------------------------------------------------------------- */
117 tuner_attach(struct i2c_adapter *adap, int addr,
118 unsigned short flags, int kind)
120 static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
122 struct i2c_client *client;
128 client_template.adapter = adap;
129 client_template.addr = addr;
131 client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
134 memcpy(client, &client_template, sizeof(struct i2c_client));
136 printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
138 i2c_attach_client(client);
141 if (i2c_master_send(client, buffer, 2) != 2)
142 printk("tuner: i2c i/o error 1\n");
143 if (i2c_master_send(client, buffer+2, 2) != 2)
144 printk("tuner: i2c i/o error 2\n");
145 if (i2c_master_send(client, buffer+4, 2) != 2)
146 printk("tuner: i2c i/o error 3\n");
151 tuner_detach(struct i2c_client *c)
158 tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
160 int *iarg = (int*)arg;
164 case TUNER_SET_TVFREQ:
165 set_tv_freq(client, *iarg);
175 tuner_probe(struct i2c_adapter *adap)
178 if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_LP))
179 return i2c_probe(adap, &addr_data, tuner_attach);
183 /* ----------------------------------------------------------------------- */
185 static struct i2c_driver
188 "sab3036", /* name */
189 I2C_DRIVERID_SAB3036, /* ID */
196 static struct i2c_client client_template =
198 "SAB3036", /* name */
211 i2c_add_driver(&i2c_driver_tuner);
218 i2c_del_driver(&i2c_driver_tuner);
221 MODULE_DESCRIPTION("SAB3036 tuner driver");
222 MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
223 MODULE_LICENSE("GPL");
225 MODULE_PARM(debug,"i");
226 MODULE_PARM_DESC(debug,"Enable debugging output");
228 module_init(tuner3036_init);
229 module_exit(tuner3036_exit);