Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 */ | |
b3d5496e | 37 | static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END }; |
68cc9d0b | 38 | static unsigned short ignore = I2C_CLIENT_END; |
1da177e4 LT |
39 | |
40 | static struct i2c_client_address_data addr_data = { | |
b3d5496e | 41 | .normal_i2c = normal_i2c, |
68cc9d0b JD |
42 | .probe = &ignore, |
43 | .ignore = &ignore, | |
1da177e4 LT |
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 | { | |
af9eeed2 | 154 | case VIDIOCSFREQ: |
1da177e4 LT |
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_ALGO_BIT | 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); |