1 /*
2    tda9840 - i2c-driver for the tda9840 by SGS Thomson
3
4    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
6
7    The tda9840 is a stereo/dual sound processor with digital
8    identification. It can be found at address 0x84 on the i2c-bus.
9
10    For detailed informations download the specifications directly
11    from SGS Thomson at http://www.st.com
12
13    This program is free software; you can redistribute it and/or modify
14    it under the terms of the GNU General Public License as published by
15    the Free Software Foundation; either version 2 of the License, or
16    (at your option) any later version.
17
18    This program is distributed in the hope that it will be useful,
19    but WITHOUT ANY WARRANTY; without even the implied warranty of
20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21    GNU General Public License for more details.
22
23    You should have received a copy of the GNU General Public License
24    along with this program; if not, write to the Free Software
25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  */
27
28
29#include <linux/module.h>
30#include <linux/ioctl.h>
31#include <linux/slab.h>
32#include <linux/i2c.h>
33#include <media/v4l2-device.h>
34#include <media/v4l2-chip-ident.h>
35
36MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
37MODULE_DESCRIPTION("tda9840 driver");
38MODULE_LICENSE("GPL");
39
40static int debug;
41module_param(debug, int, 0644);
42
43MODULE_PARM_DESC(debug, "Debug level (0-1)");
44
45#define	SWITCH		0x00
46#define	LEVEL_ADJUST	0x02
47#define	STEREO_ADJUST	0x03
48#define	TEST		0x04
49
50#define TDA9840_SET_MUTE                0x00
51#define TDA9840_SET_MONO                0x10
52#define TDA9840_SET_STEREO              0x2a
53#define TDA9840_SET_LANG1               0x12
54#define TDA9840_SET_LANG2               0x1e
55#define TDA9840_SET_BOTH                0x1a
56#define TDA9840_SET_BOTH_R              0x16
57#define TDA9840_SET_EXTERNAL            0x7a
58
59
60static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
61{
62	struct i2c_client *client = v4l2_get_subdevdata(sd);
63
64	if (i2c_smbus_write_byte_data(client, reg, val))
65		v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
66				val, reg);
67}
68
69static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
70{
71	int byte;
72
73	if (t->index)
74		return -EINVAL;
75
76	switch (t->audmode) {
77	case V4L2_TUNER_MODE_STEREO:
78		byte = TDA9840_SET_STEREO;
79		break;
80	case V4L2_TUNER_MODE_LANG1_LANG2:
81		byte = TDA9840_SET_BOTH;
82		break;
83	case V4L2_TUNER_MODE_LANG1:
84		byte = TDA9840_SET_LANG1;
85		break;
86	case V4L2_TUNER_MODE_LANG2:
87		byte = TDA9840_SET_LANG2;
88		break;
89	default:
90		byte = TDA9840_SET_MONO;
91		break;
92	}
93	v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
94	tda9840_write(sd, SWITCH, byte);
95	return 0;
96}
97
98static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
99{
100	struct i2c_client *client = v4l2_get_subdevdata(sd);
101	u8 byte;
102
103	t->rxsubchans = V4L2_TUNER_SUB_MONO;
104	if (1 != i2c_master_recv(client, &byte, 1)) {
105		v4l2_dbg(1, debug, sd,
106			"i2c_master_recv() failed\n");
107		return -EIO;
108	}
109
110	if (byte & 0x80) {
111		v4l2_dbg(1, debug, sd,
112			"TDA9840_DETECT: register contents invalid\n");
113		return -EINVAL;
114	}
115
116	v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
117
118	switch (byte & 0x60) {
119	case 0x00:
120		t->rxsubchans = V4L2_TUNER_SUB_MONO;
121		break;
122	case 0x20:
123		t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
124		break;
125	case 0x40:
126		t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
127		break;
128	default: /* Incorrect detect */
129		t->rxsubchans = V4L2_TUNER_MODE_MONO;
130		break;
131	}
132	return 0;
133}
134
135static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
136{
137	struct i2c_client *client = v4l2_get_subdevdata(sd);
138
139	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
140}
141
142/* ----------------------------------------------------------------------- */
143
144static const struct v4l2_subdev_core_ops tda9840_core_ops = {
145	.g_chip_ident = tda9840_g_chip_ident,
146};
147
148static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
149	.s_tuner = tda9840_s_tuner,
150	.g_tuner = tda9840_g_tuner,
151};
152
153static const struct v4l2_subdev_ops tda9840_ops = {
154	.core = &tda9840_core_ops,
155	.tuner = &tda9840_tuner_ops,
156};
157
158/* ----------------------------------------------------------------------- */
159
160static int tda9840_probe(struct i2c_client *client,
161			  const struct i2c_device_id *id)
162{
163	struct v4l2_subdev *sd;
164
165	/* let's see whether this adapter can support what we need */
166	if (!i2c_check_functionality(client->adapter,
167			I2C_FUNC_SMBUS_READ_BYTE_DATA |
168			I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
169		return -EIO;
170
171	v4l_info(client, "chip found @ 0x%x (%s)\n",
172			client->addr << 1, client->adapter->name);
173
174	sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
175	if (sd == NULL)
176		return -ENOMEM;
177	v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
178
179	/* set initial values for level & stereo - adjustment, mode */
180	tda9840_write(sd, LEVEL_ADJUST, 0);
181	tda9840_write(sd, STEREO_ADJUST, 0);
182	tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
183	return 0;
184}
185
186static int tda9840_remove(struct i2c_client *client)
187{
188	struct v4l2_subdev *sd = i2c_get_clientdata(client);
189
190	v4l2_device_unregister_subdev(sd);
191	kfree(sd);
192	return 0;
193}
194
195static const struct i2c_device_id tda9840_id[] = {
196	{ "tda9840", 0 },
197	{ }
198};
199MODULE_DEVICE_TABLE(i2c, tda9840_id);
200
201static struct i2c_driver tda9840_driver = {
202	.driver = {
203		.owner	= THIS_MODULE,
204		.name	= "tda9840",
205	},
206	.probe		= tda9840_probe,
207	.remove		= tda9840_remove,
208	.id_table	= tda9840_id,
209};
210
211static __init int init_tda9840(void)
212{
213	return i2c_add_driver(&tda9840_driver);
214}
215
216static __exit void exit_tda9840(void)
217{
218	i2c_del_driver(&tda9840_driver);
219}
220
221module_init(init_tda9840);
222module_exit(exit_tda9840);
223