vp27smpx.c

  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@kernel.org>
  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
 20MODULE_DESCRIPTION("vp27smpx driver");
 21MODULE_AUTHOR("Hans Verkuil");
 22MODULE_LICENSE("GPL");
 23
 24
 25/* ----------------------------------------------------------------------- */
 26
 27struct vp27smpx_state {
 28	struct v4l2_subdev sd;
 29	int radio;
 30	u32 audmode;
 31};
 32
 33static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
 34{
 35	return container_of(sd, struct vp27smpx_state, sd);
 36}
 37
 38static 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
 63static 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
 71static 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
 79static 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
 88static 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
101static 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
112static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
113	.log_status = vp27smpx_log_status,
114};
115
116static 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
122static const struct v4l2_subdev_video_ops vp27smpx_video_ops = {
123	.s_std = vp27smpx_s_std,
124};
125
126static 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
141static 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
165static 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
174static const struct i2c_device_id vp27smpx_id[] = {
175	{ "vp27smpx" },
176	{ }
177};
178MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
179
180static 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
189module_i2c_driver(vp27smpx_driver);