190 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * vp27smpx - driver version 0.0.14 *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 else60 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 probe138 * 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);190