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 33 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd) 34 { 35 return container_of(sd, struct vp27smpx_state, sd); 36 } 37 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 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 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 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 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 } 100 101 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 */ 140 141 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 } 164 165 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_new = vp27smpx_probe, 185 .remove = vp27smpx_remove, 186 .id_table = vp27smpx_id, 187 }; 188 189 module_i2c_driver(vp27smpx_driver); 190