drivers/media/radio/radio-timb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * radio-timb.c Timberdale FPGA Radio driver
   4  * Copyright (c) 2009 Intel Corporation
   5  */
   6
   7 #include <linux/io.h>
   8 #include <media/v4l2-ioctl.h>
   9 #include <media/v4l2-device.h>
  10 #include <media/v4l2-ctrls.h>
  11 #include <media/v4l2-event.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/slab.h>
  15 #include <linux/i2c.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_data/media/timb_radio.h>
  18
  19 #define DRIVER_NAME "timb-radio"
  20
  21 struct timbradio {
  22         struct timb_radio_platform_data pdata;
  23         struct v4l2_subdev      *sd_tuner;
  24         struct v4l2_subdev      *sd_dsp;
  25         struct video_device     video_dev;
  26         struct v4l2_device      v4l2_dev;
  27         struct mutex            lock;
  28 };
  29
  30
  31 static int timbradio_vidioc_querycap(struct file *file, void  *priv,
  32         struct v4l2_capability *v)
  33 {
  34         strscpy(v->driver, DRIVER_NAME, sizeof(v->driver));
  35         strscpy(v->card, "Timberdale Radio", sizeof(v->card));
  36         snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
  37         return 0;
  38 }
  39
  40 static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
  41         struct v4l2_tuner *v)
  42 {
  43         struct timbradio *tr = video_drvdata(file);
  44         return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
  45 }
  46
  47 static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
  48         const struct v4l2_tuner *v)
  49 {
  50         struct timbradio *tr = video_drvdata(file);
  51         return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
  52 }
  53
  54 static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
  55         const struct v4l2_frequency *f)
  56 {
  57         struct timbradio *tr = video_drvdata(file);
  58         return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
  59 }
  60
  61 static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
  62         struct v4l2_frequency *f)
  63 {
  64         struct timbradio *tr = video_drvdata(file);
  65         return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
  66 }
  67
  68 static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
  69         .vidioc_querycap        = timbradio_vidioc_querycap,
  70         .vidioc_g_tuner         = timbradio_vidioc_g_tuner,
  71         .vidioc_s_tuner         = timbradio_vidioc_s_tuner,
  72         .vidioc_g_frequency     = timbradio_vidioc_g_frequency,
  73         .vidioc_s_frequency     = timbradio_vidioc_s_frequency,
  74         .vidioc_log_status      = v4l2_ctrl_log_status,
  75         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
  76         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
  77 };
  78
  79 static const struct v4l2_file_operations timbradio_fops = {
  80         .owner          = THIS_MODULE,
  81         .open           = v4l2_fh_open,
  82         .release        = v4l2_fh_release,
  83         .poll           = v4l2_ctrl_poll,
  84         .unlocked_ioctl = video_ioctl2,
  85 };
  86
  87 static int timbradio_probe(struct platform_device *pdev)
  88 {
  89         struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
  90         struct timbradio *tr;
  91         int err;
  92
  93         if (!pdata) {
  94                 dev_err(&pdev->dev, "Platform data missing\n");
  95                 err = -EINVAL;
  96                 goto err;
  97         }
  98
  99         tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
 100         if (!tr) {
 101                 err = -ENOMEM;
 102                 goto err;
 103         }
 104
 105         tr->pdata = *pdata;
 106         mutex_init(&tr->lock);
 107
 108         strscpy(tr->video_dev.name, "Timberdale Radio",
 109                 sizeof(tr->video_dev.name));
 110         tr->video_dev.fops = &timbradio_fops;
 111         tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
 112         tr->video_dev.release = video_device_release_empty;
 113         tr->video_dev.minor = -1;
 114         tr->video_dev.lock = &tr->lock;
 115         tr->video_dev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 116
 117         strscpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
 118         err = v4l2_device_register(NULL, &tr->v4l2_dev);
 119         if (err)
 120                 goto err;
 121
 122         tr->video_dev.v4l2_dev = &tr->v4l2_dev;
 123
 124         tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 125                 i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
 126         tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 127                 i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
 128         if (tr->sd_tuner == NULL || tr->sd_dsp == NULL) {
 129                 err = -ENODEV;
 130                 goto err_video_req;
 131         }
 132
 133         tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
 134
 135         err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
 136         if (err) {
 137                 dev_err(&pdev->dev, "Error reg video\n");
 138                 goto err_video_req;
 139         }
 140
 141         video_set_drvdata(&tr->video_dev, tr);
 142
 143         platform_set_drvdata(pdev, tr);
 144         return 0;
 145
 146 err_video_req:
 147         v4l2_device_unregister(&tr->v4l2_dev);
 148 err:
 149         dev_err(&pdev->dev, "Failed to register: %d\n", err);
 150
 151         return err;
 152 }
 153
 154 static void timbradio_remove(struct platform_device *pdev)
 155 {
 156         struct timbradio *tr = platform_get_drvdata(pdev);
 157
 158         video_unregister_device(&tr->video_dev);
 159         v4l2_device_unregister(&tr->v4l2_dev);
 160 }
 161
 162 static struct platform_driver timbradio_platform_driver = {
 163         .driver = {
 164                 .name   = DRIVER_NAME,
 165         },
 166         .probe          = timbradio_probe,
 167         .remove         = timbradio_remove,
 168 };
 169
 170 module_platform_driver(timbradio_platform_driver);
 171
 172 MODULE_DESCRIPTION("Timberdale Radio driver");
 173 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 174 MODULE_LICENSE("GPL v2");
 175 MODULE_VERSION("0.0.2");
 176 MODULE_ALIAS("platform:"DRIVER_NAME);