LXR linux/drivers/media/i2c/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@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
  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                          const struct i2c_device_id *id)
 143{
 144        struct vp27smpx_state *state;
 145        struct v4l2_subdev *sd;
 146
 147        /* Check if the adapter supports the needed features */
 148        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 149                return -EIO;
 150
 151        v4l_info(client, "chip found @ 0x%x (%s)\n",
 152                        client->addr << 1, client->adapter->name);
 153
 154        state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 155        if (state == NULL)
 156                return -ENOMEM;
 157        sd = &state->sd;
 158        v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 159        state->audmode = V4L2_TUNER_MODE_STEREO;
 160
 161        /* initialize vp27smpx */
 162        vp27smpx_set_audmode(sd, state->audmode);
 163        return 0;
 164}
 165
 166static int vp27smpx_remove(struct i2c_client *client)
 167{
 168        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 169
 170        v4l2_device_unregister_subdev(sd);
 171        return 0;
 172}
 173
 174/* ----------------------------------------------------------------------- */
 175
 176static const struct i2c_device_id vp27smpx_id[] = {
 177        { "vp27smpx", 0 },
 178        { }
 179};
 180MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 181
 182static struct i2c_driver vp27smpx_driver = {
 183        .driver = {
 184                .name   = "vp27smpx",
 185        },
 186        .probe          = vp27smpx_probe,
 187        .remove         = vp27smpx_remove,
 188        .id_table       = vp27smpx_id,
 189};
 190
 191module_i2c_driver(vp27smpx_driver);
 192