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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 */ | |
37 | static unsigned short normal_i2c[] = {I2C_CLIENT_END}; | |
38 | static unsigned short normal_i2c_range[] = {0x60, 0x61, I2C_CLIENT_END}; | |
39 | static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; | |
40 | static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; | |
41 | static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; | |
42 | static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; | |
43 | static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; | |
44 | ||
45 | static 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 | ||
54 | static unsigned char | |
55 | tuner_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 | ||
65 | static int | |
66 | tuner_islocked (struct i2c_client *c) | |
67 | { | |
68 | return (tuner_getstatus(c) & TUNER_FL); | |
69 | } | |
70 | ||
71 | /* ---------------------------------------------------------------------- */ | |
72 | ||
73 | static void | |
74 | set_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 | ||
115 | static int | |
116 | tuner_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 | ||
147 | static int | |
148 | tuner_detach(struct i2c_client *c) | |
149 | { | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static int | |
154 | tuner_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 | ||
170 | static int | |
171 | tuner_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 | ||
181 | static struct i2c_driver | |
182 | i2c_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 | ||
193 | static struct i2c_client client_template = | |
194 | { | |
195 | .driver = &i2c_driver_tuner, | |
196 | .name = "SAB3036", | |
197 | }; | |
198 | ||
199 | static int __init | |
200 | tuner3036_init(void) | |
201 | { | |
202 | i2c_add_driver(&i2c_driver_tuner); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static void __exit | |
207 | tuner3036_exit(void) | |
208 | { | |
209 | i2c_del_driver(&i2c_driver_tuner); | |
210 | } | |
211 | ||
212 | MODULE_DESCRIPTION("SAB3036 tuner driver"); | |
213 | MODULE_AUTHOR("Philip Blundell <philb@gnu.org>"); | |
214 | MODULE_LICENSE("GPL"); | |
215 | ||
216 | module_param(debug, int, 0); | |
217 | MODULE_PARM_DESC(debug,"Enable debugging output"); | |
218 | ||
219 | module_init(tuner3036_init); | |
220 | module_exit(tuner3036_exit); |