]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | tda9840 - i2c-driver for the tda9840 by SGS Thomson | |
3 | ||
4 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> | |
5 | ||
6 | The tda9840 is a stereo/dual sound processor with digital | |
7 | identification. It can be found at address 0x84 on the i2c-bus. | |
8 | ||
9 | For detailed informations download the specifications directly | |
10 | from SGS Thomson at http://www.st.com | |
11 | ||
12 | This program is free software; you can redistribute it and/or modify | |
13 | it under the terms of the GNU General Public License as published by | |
14 | the Free Software Foundation; either version 2 of the License, or | |
15 | (at your option) any later version. | |
16 | ||
17 | This program is distributed in the hope that it will be useful, | |
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | GNU General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU General Public License | |
23 | along with this program; if not, write to the Free Software | |
24 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
a8733ca5 | 27 | |
1da177e4 LT |
28 | #include <linux/module.h> |
29 | #include <linux/ioctl.h> | |
30 | #include <linux/i2c.h> | |
31 | ||
32 | #include "tda9840.h" | |
33 | ||
ff699e6b | 34 | static int debug; /* insmod parameter */ |
1da177e4 LT |
35 | module_param(debug, int, 0644); |
36 | MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off)."); | |
37 | #define dprintk(args...) \ | |
7e28adb2 | 38 | do { if (debug) { printk("%s: %s()[%d]: ", KBUILD_MODNAME, __func__, __LINE__); printk(args); } } while (0) |
1da177e4 LT |
39 | |
40 | #define SWITCH 0x00 | |
41 | #define LEVEL_ADJUST 0x02 | |
42 | #define STEREO_ADJUST 0x03 | |
43 | #define TEST 0x04 | |
44 | ||
45 | /* addresses to scan, found only at 0x42 (7-Bit) */ | |
09df1c16 | 46 | static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END }; |
1da177e4 LT |
47 | |
48 | /* magic definition of all other variables and things */ | |
49 | I2C_CLIENT_INSMOD; | |
50 | ||
51 | static struct i2c_driver driver; | |
52 | static struct i2c_client client_template; | |
53 | ||
54 | static int command(struct i2c_client *client, unsigned int cmd, void *arg) | |
55 | { | |
56 | int result; | |
57 | int byte = *(int *)arg; | |
58 | ||
59 | switch (cmd) { | |
60 | case TDA9840_SWITCH: | |
61 | ||
62 | dprintk("TDA9840_SWITCH: 0x%02x\n", byte); | |
63 | ||
64 | if (byte != TDA9840_SET_MONO | |
65 | && byte != TDA9840_SET_MUTE | |
66 | && byte != TDA9840_SET_STEREO | |
67 | && byte != TDA9840_SET_LANG1 | |
68 | && byte != TDA9840_SET_LANG2 | |
69 | && byte != TDA9840_SET_BOTH | |
70 | && byte != TDA9840_SET_BOTH_R | |
71 | && byte != TDA9840_SET_EXTERNAL) { | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
75 | result = i2c_smbus_write_byte_data(client, SWITCH, byte); | |
76 | if (result) | |
77 | dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); | |
78 | break; | |
79 | ||
80 | case TDA9840_LEVEL_ADJUST: | |
81 | ||
82 | dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte); | |
83 | ||
84 | /* check for correct range */ | |
85 | if (byte > 25 || byte < -20) | |
86 | return -EINVAL; | |
87 | ||
88 | /* calculate actual value to set, see specs, page 18 */ | |
89 | byte /= 5; | |
90 | if (0 < byte) | |
91 | byte += 0x8; | |
92 | else | |
93 | byte = -byte; | |
94 | ||
95 | result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte); | |
96 | if (result) | |
97 | dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); | |
98 | break; | |
99 | ||
100 | case TDA9840_STEREO_ADJUST: | |
101 | ||
102 | dprintk("TDA9840_STEREO_ADJUST: %d\n", byte); | |
103 | ||
104 | /* check for correct range */ | |
105 | if (byte > 25 || byte < -24) | |
106 | return -EINVAL; | |
107 | ||
108 | /* calculate actual value to set */ | |
109 | byte /= 5; | |
110 | if (0 < byte) | |
111 | byte += 0x20; | |
112 | else | |
113 | byte = -byte; | |
114 | ||
115 | result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte); | |
116 | if (result) | |
117 | dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); | |
118 | break; | |
119 | ||
120 | case TDA9840_DETECT: { | |
121 | int *ret = (int *)arg; | |
122 | ||
123 | byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST); | |
124 | if (byte == -1) { | |
125 | dprintk("i2c_smbus_read_byte_data() failed\n"); | |
126 | return -EIO; | |
127 | } | |
128 | ||
129 | if (0 != (byte & 0x80)) { | |
130 | dprintk("TDA9840_DETECT: register contents invalid\n"); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte); | |
135 | *ret = ((byte & 0x60) >> 5); | |
136 | result = 0; | |
137 | break; | |
138 | } | |
139 | case TDA9840_TEST: | |
140 | dprintk("TDA9840_TEST: 0x%02x\n", byte); | |
141 | ||
142 | /* mask out irrelevant bits */ | |
143 | byte &= 0x3; | |
144 | ||
145 | result = i2c_smbus_write_byte_data(client, TEST, byte); | |
146 | if (result) | |
147 | dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); | |
148 | break; | |
149 | default: | |
150 | return -ENOIOCTLCMD; | |
151 | } | |
152 | ||
153 | if (result) | |
154 | return -EIO; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static int detect(struct i2c_adapter *adapter, int address, int kind) | |
160 | { | |
161 | struct i2c_client *client; | |
162 | int result = 0; | |
163 | ||
164 | int byte = 0x0; | |
165 | ||
166 | /* let's see whether this adapter can support what we need */ | |
167 | if (0 == i2c_check_functionality(adapter, | |
168 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
169 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) { | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /* allocate memory for client structure */ | |
174 | client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); | |
5fa1247a | 175 | if (!client) { |
1da177e4 LT |
176 | printk("not enough kernel memory\n"); |
177 | return -ENOMEM; | |
178 | } | |
179 | ||
180 | /* fill client structure */ | |
181 | memcpy(client, &client_template, sizeof(struct i2c_client)); | |
182 | client->addr = address; | |
183 | client->adapter = adapter; | |
184 | ||
185 | /* tell the i2c layer a new client has arrived */ | |
186 | if (0 != (result = i2c_attach_client(client))) { | |
187 | kfree(client); | |
188 | return result; | |
189 | } | |
190 | ||
191 | /* set initial values for level & stereo - adjustment, mode */ | |
192 | byte = 0; | |
193 | result = command(client, TDA9840_LEVEL_ADJUST, &byte); | |
194 | result += command(client, TDA9840_STEREO_ADJUST, &byte); | |
195 | byte = TDA9840_SET_MONO; | |
196 | result = command(client, TDA9840_SWITCH, &byte); | |
197 | if (result) { | |
198 | dprintk("could not initialize tda9840\n"); | |
199 | return -ENODEV; | |
200 | } | |
201 | ||
202 | printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int attach(struct i2c_adapter *adapter) | |
207 | { | |
208 | /* let's see whether this is a know adapter we can attach to */ | |
1684a984 | 209 | if (adapter->id != I2C_HW_SAA7146) { |
1da177e4 LT |
210 | dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id); |
211 | return -ENODEV; | |
212 | } | |
213 | ||
214 | return i2c_probe(adapter, &addr_data, &detect); | |
215 | } | |
216 | ||
217 | static int detach(struct i2c_client *client) | |
218 | { | |
219 | int ret = i2c_detach_client(client); | |
220 | kfree(client); | |
221 | return ret; | |
222 | } | |
223 | ||
224 | static struct i2c_driver driver = { | |
604f28e2 | 225 | .driver = { |
a8733ca5 | 226 | .name = "tda9840", |
604f28e2 | 227 | }, |
1da177e4 | 228 | .id = I2C_DRIVERID_TDA9840, |
1da177e4 LT |
229 | .attach_adapter = attach, |
230 | .detach_client = detach, | |
231 | .command = command, | |
232 | }; | |
233 | ||
234 | static struct i2c_client client_template = { | |
fae91e72 | 235 | .name = "tda9840", |
1da177e4 LT |
236 | .driver = &driver, |
237 | }; | |
238 | ||
239 | static int __init this_module_init(void) | |
240 | { | |
241 | return i2c_add_driver(&driver); | |
242 | } | |
243 | ||
244 | static void __exit this_module_exit(void) | |
245 | { | |
246 | i2c_del_driver(&driver); | |
247 | } | |
248 | ||
249 | module_init(this_module_init); | |
250 | module_exit(this_module_exit); | |
251 | ||
252 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); | |
253 | MODULE_DESCRIPTION("tda9840 driver"); | |
254 | MODULE_LICENSE("GPL"); |