1/*
2 * vp27smpx - driver version 0.0.1
3 *
4 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
5 *
6 * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
7 * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/slab.h>
27#include <linux/ioctl.h>
28#include <asm/uaccess.h>
29#include <linux/i2c.h>
30#include <linux/videodev2.h>
31#include <media/v4l2-device.h>
32#include <media/v4l2-chip-ident.h>
33
34MODULE_DESCRIPTION("vp27smpx driver");
35MODULE_AUTHOR("Hans Verkuil");
36MODULE_LICENSE("GPL");
37
38
39/* ----------------------------------------------------------------------- */
40
41struct vp27smpx_state {
42	struct v4l2_subdev sd;
43	int radio;
44	u32 audmode;
45};
46
47static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
48{
49	return container_of(sd, struct vp27smpx_state, sd);
50}
51
52static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
53{
54	struct vp27smpx_state *state = to_state(sd);
55	struct i2c_client *client = v4l2_get_subdevdata(sd);
56	u8 data[3] = { 0x00, 0x00, 0x04 };
57
58	switch (audmode) {
59	case V4L2_TUNER_MODE_MONO:
60	case V4L2_TUNER_MODE_LANG1:
61		break;
62	case V4L2_TUNER_MODE_STEREO:
63	case V4L2_TUNER_MODE_LANG1_LANG2:
64		data[1] = 0x01;
65		break;
66	case V4L2_TUNER_MODE_LANG2:
67		data[1] = 0x02;
68		break;
69	}
70
71	if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
72		v4l2_err(sd, "I/O error setting audmode\n");
73	else
74		state->audmode = audmode;
75}
76
77static int vp27smpx_s_radio(struct v4l2_subdev *sd)
78{
79	struct vp27smpx_state *state = to_state(sd);
80
81	state->radio = 1;
82	return 0;
83}
84
85static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
86{
87	struct vp27smpx_state *state = to_state(sd);
88
89	state->radio = 0;
90	return 0;
91}
92
93static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
94{
95	struct vp27smpx_state *state = to_state(sd);
96
97	if (!state->radio)
98		vp27smpx_set_audmode(sd, vt->audmode);
99	return 0;
100}
101
102static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
103{
104	struct vp27smpx_state *state = to_state(sd);
105
106	if (state->radio)
107		return 0;
108	vt->audmode = state->audmode;
109	vt->capability = V4L2_TUNER_CAP_STEREO |
110		V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
111	vt->rxsubchans = V4L2_TUNER_SUB_MONO;
112	return 0;
113}
114
115static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
116{
117	struct i2c_client *client = v4l2_get_subdevdata(sd);
118
119	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
120}
121
122static int vp27smpx_log_status(struct v4l2_subdev *sd)
123{
124	struct vp27smpx_state *state = to_state(sd);
125
126	v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
127			state->radio ? " (Radio)" : "");
128	return 0;
129}
130
131/* ----------------------------------------------------------------------- */
132
133static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
134	.log_status = vp27smpx_log_status,
135	.g_chip_ident = vp27smpx_g_chip_ident,
136	.s_std = vp27smpx_s_std,
137};
138
139static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
140	.s_radio = vp27smpx_s_radio,
141	.s_tuner = vp27smpx_s_tuner,
142	.g_tuner = vp27smpx_g_tuner,
143};
144
145static const struct v4l2_subdev_ops vp27smpx_ops = {
146	.core = &vp27smpx_core_ops,
147	.tuner = &vp27smpx_tuner_ops,
148};
149
150/* ----------------------------------------------------------------------- */
151
152/* i2c implementation */
153
154/*
155 * Generic i2c probe
156 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
157 */
158
159static int vp27smpx_probe(struct i2c_client *client,
160			  const struct i2c_device_id *id)
161{
162	struct vp27smpx_state *state;
163	struct v4l2_subdev *sd;
164
165	/* Check if the adapter supports the needed features */
166	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
167		return -EIO;
168
169	v4l_info(client, "chip found @ 0x%x (%s)\n",
170			client->addr << 1, client->adapter->name);
171
172	state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
173	if (state == NULL)
174		return -ENOMEM;
175	sd = &state->sd;
176	v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
177	state->audmode = V4L2_TUNER_MODE_STEREO;
178
179	/* initialize vp27smpx */
180	vp27smpx_set_audmode(sd, state->audmode);
181	return 0;
182}
183
184static int vp27smpx_remove(struct i2c_client *client)
185{
186	struct v4l2_subdev *sd = i2c_get_clientdata(client);
187
188	v4l2_device_unregister_subdev(sd);
189	kfree(to_state(sd));
190	return 0;
191}
192
193/* ----------------------------------------------------------------------- */
194
195static const struct i2c_device_id vp27smpx_id[] = {
196	{ "vp27smpx", 0 },
197	{ }
198};
199MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
200
201static struct i2c_driver vp27smpx_driver = {
202	.driver = {
203		.owner	= THIS_MODULE,
204		.name	= "vp27smpx",
205	},
206	.probe		= vp27smpx_probe,
207	.remove		= vp27smpx_remove,
208	.id_table	= vp27smpx_id,
209};
210
211static __init int init_vp27smpx(void)
212{
213	return i2c_add_driver(&vp27smpx_driver);
214}
215
216static __exit void exit_vp27smpx(void)
217{
218	i2c_del_driver(&vp27smpx_driver);
219}
220
221module_init(init_vp27smpx);
222module_exit(exit_vp27smpx);
223