1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * vp27smpx - driver version 0.0.1
4 *
5 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
6 *
7 * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
8 * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
9 */
10
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/ioctl.h>
15 #include <linux/uaccess.h>
16 #include <linux/i2c.h>
17 #include <linux/videodev2.h>
18 #include <media/v4l2-device.h>
19
20 MODULE_DESCRIPTION("vp27smpx driver");
21 MODULE_AUTHOR("Hans Verkuil");
22 MODULE_LICENSE("GPL");
23
24
25 /* ----------------------------------------------------------------------- */
26
27 struct vp27smpx_state {
28 struct v4l2_subdev sd;
29 int radio;
30 u32 audmode;
31 };
32
to_state(struct v4l2_subdev * sd)33 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
34 {
35 return container_of(sd, struct vp27smpx_state, sd);
36 }
37
vp27smpx_set_audmode(struct v4l2_subdev * sd,u32 audmode)38 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
39 {
40 struct vp27smpx_state *state = to_state(sd);
41 struct i2c_client *client = v4l2_get_subdevdata(sd);
42 u8 data[3] = { 0x00, 0x00, 0x04 };
43
44 switch (audmode) {
45 case V4L2_TUNER_MODE_MONO:
46 case V4L2_TUNER_MODE_LANG1:
47 break;
48 case V4L2_TUNER_MODE_STEREO:
49 case V4L2_TUNER_MODE_LANG1_LANG2:
50 data[1] = 0x01;
51 break;
52 case V4L2_TUNER_MODE_LANG2:
53 data[1] = 0x02;
54 break;
55 }
56
57 if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
58 v4l2_err(sd, "I/O error setting audmode\n");
59 else
60 state->audmode = audmode;
61 }
62
vp27smpx_s_radio(struct v4l2_subdev * sd)63 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
64 {
65 struct vp27smpx_state *state = to_state(sd);
66
67 state->radio = 1;
68 return 0;
69 }
70
vp27smpx_s_std(struct v4l2_subdev * sd,v4l2_std_id norm)71 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
72 {
73 struct vp27smpx_state *state = to_state(sd);
74
75 state->radio = 0;
76 return 0;
77 }
78
vp27smpx_s_tuner(struct v4l2_subdev * sd,const struct v4l2_tuner * vt)79 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
80 {
81 struct vp27smpx_state *state = to_state(sd);
82
83 if (!state->radio)
84 vp27smpx_set_audmode(sd, vt->audmode);
85 return 0;
86 }
87
vp27smpx_g_tuner(struct v4l2_subdev * sd,struct v4l2_tuner * vt)88 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
89 {
90 struct vp27smpx_state *state = to_state(sd);
91
92 if (state->radio)
93 return 0;
94 vt->audmode = state->audmode;
95 vt->capability = V4L2_TUNER_CAP_STEREO |
96 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
97 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
98 return 0;
99 }
100
vp27smpx_log_status(struct v4l2_subdev * sd)101 static int vp27smpx_log_status(struct v4l2_subdev *sd)
102 {
103 struct vp27smpx_state *state = to_state(sd);
104
105 v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
106 state->radio ? " (Radio)" : "");
107 return 0;
108 }
109
110 /* ----------------------------------------------------------------------- */
111
112 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
113 .log_status = vp27smpx_log_status,
114 };
115
116 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
117 .s_radio = vp27smpx_s_radio,
118 .s_tuner = vp27smpx_s_tuner,
119 .g_tuner = vp27smpx_g_tuner,
120 };
121
122 static const struct v4l2_subdev_video_ops vp27smpx_video_ops = {
123 .s_std = vp27smpx_s_std,
124 };
125
126 static const struct v4l2_subdev_ops vp27smpx_ops = {
127 .core = &vp27smpx_core_ops,
128 .tuner = &vp27smpx_tuner_ops,
129 .video = &vp27smpx_video_ops,
130 };
131
132 /* ----------------------------------------------------------------------- */
133
134 /* i2c implementation */
135
136 /*
137 * Generic i2c probe
138 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
139 */
140
vp27smpx_probe(struct i2c_client * client)141 static int vp27smpx_probe(struct i2c_client *client)
142 {
143 struct vp27smpx_state *state;
144 struct v4l2_subdev *sd;
145
146 /* Check if the adapter supports the needed features */
147 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
148 return -EIO;
149
150 v4l_info(client, "chip found @ 0x%x (%s)\n",
151 client->addr << 1, client->adapter->name);
152
153 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
154 if (state == NULL)
155 return -ENOMEM;
156 sd = &state->sd;
157 v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
158 state->audmode = V4L2_TUNER_MODE_STEREO;
159
160 /* initialize vp27smpx */
161 vp27smpx_set_audmode(sd, state->audmode);
162 return 0;
163 }
164
vp27smpx_remove(struct i2c_client * client)165 static void vp27smpx_remove(struct i2c_client *client)
166 {
167 struct v4l2_subdev *sd = i2c_get_clientdata(client);
168
169 v4l2_device_unregister_subdev(sd);
170 }
171
172 /* ----------------------------------------------------------------------- */
173
174 static const struct i2c_device_id vp27smpx_id[] = {
175 { "vp27smpx", 0 },
176 { }
177 };
178 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
179
180 static struct i2c_driver vp27smpx_driver = {
181 .driver = {
182 .name = "vp27smpx",
183 },
184 .probe = vp27smpx_probe,
185 .remove = vp27smpx_remove,
186 .id_table = vp27smpx_id,
187 };
188
189 module_i2c_driver(vp27smpx_driver);
190