FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / media / video / tea6420.c
blob5ea840401f21865120623691ecc0d20cc084decc
1 /*
2 tea6420 - i2c-driver for the tea6420 by SGS Thomson
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
7 The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
8 4 stereo outputs and gain control for each output.
9 It is cascadable, i.e. it can be found at the addresses 0x98
10 and 0x9a on the i2c-bus.
12 For detailed informations download the specifications directly
13 from SGS Thomson at http://www.st.com
15 This program is free software; you can redistribute it and/or modify
16 it under the terms of the GNU General Public License as published by
17 the Free Software Foundation; either version 2 of the License, or
18 (at your option) any later version.
20 This program is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU General Public License for more details.
25 You should have received a copy of the GNU General Public License
26 along with this program; if not, write to the Free Software
27 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <linux/module.h>
32 #include <linux/ioctl.h>
33 #include <linux/slab.h>
34 #include <linux/i2c.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-chip-ident.h>
37 #include "tea6420.h"
39 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
40 MODULE_DESCRIPTION("tea6420 driver");
41 MODULE_LICENSE("GPL");
43 static int debug;
44 module_param(debug, int, 0644);
46 MODULE_PARM_DESC(debug, "Debug level (0-1)");
49 /* make a connection between the input 'i' and the output 'o'
50 with gain 'g' (note: i = 6 means 'mute') */
51 static int tea6420_s_routing(struct v4l2_subdev *sd,
52 u32 i, u32 o, u32 config)
54 struct i2c_client *client = v4l2_get_subdevdata(sd);
55 int g = (o >> 4) & 0xf;
56 u8 byte;
57 int ret;
59 o &= 0xf;
60 v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
62 /* check if the parameters are valid */
63 if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
64 return -EINVAL;
66 byte = ((o - 1) << 5);
67 byte |= (i - 1);
69 /* to understand this, have a look at the tea6420-specs (p.5) */
70 switch (g) {
71 case 0:
72 byte |= (3 << 3);
73 break;
74 case 2:
75 byte |= (2 << 3);
76 break;
77 case 4:
78 byte |= (1 << 3);
79 break;
80 case 6:
81 break;
84 ret = i2c_smbus_write_byte(client, byte);
85 if (ret) {
86 v4l2_dbg(1, debug, sd,
87 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
88 return -EIO;
90 return 0;
93 static int tea6420_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
95 struct i2c_client *client = v4l2_get_subdevdata(sd);
97 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6420, 0);
100 /* ----------------------------------------------------------------------- */
102 static const struct v4l2_subdev_core_ops tea6420_core_ops = {
103 .g_chip_ident = tea6420_g_chip_ident,
106 static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
107 .s_routing = tea6420_s_routing,
110 static const struct v4l2_subdev_ops tea6420_ops = {
111 .core = &tea6420_core_ops,
112 .audio = &tea6420_audio_ops,
115 static int tea6420_probe(struct i2c_client *client,
116 const struct i2c_device_id *id)
118 struct v4l2_subdev *sd;
119 int err, i;
121 /* let's see whether this adapter can support what we need */
122 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
123 return -EIO;
125 v4l_info(client, "chip found @ 0x%x (%s)\n",
126 client->addr << 1, client->adapter->name);
128 sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
129 if (sd == NULL)
130 return -ENOMEM;
131 v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
133 /* set initial values: set "mute"-input to all outputs at gain 0 */
134 err = 0;
135 for (i = 1; i < 5; i++)
136 err += tea6420_s_routing(sd, 6, i, 0);
137 if (err) {
138 v4l_dbg(1, debug, client, "could not initialize tea6420\n");
139 return -ENODEV;
141 return 0;
144 static int tea6420_remove(struct i2c_client *client)
146 struct v4l2_subdev *sd = i2c_get_clientdata(client);
148 v4l2_device_unregister_subdev(sd);
149 kfree(sd);
150 return 0;
153 static const struct i2c_device_id tea6420_id[] = {
154 { "tea6420", 0 },
157 MODULE_DEVICE_TABLE(i2c, tea6420_id);
159 static struct i2c_driver tea6420_driver = {
160 .driver = {
161 .owner = THIS_MODULE,
162 .name = "tea6420",
164 .probe = tea6420_probe,
165 .remove = tea6420_remove,
166 .id_table = tea6420_id,
169 static __init int init_tea6420(void)
171 return i2c_add_driver(&tea6420_driver);
174 static __exit void exit_tea6420(void)
176 i2c_del_driver(&tea6420_driver);
179 module_init(init_tea6420);
180 module_exit(exit_tea6420);