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         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
  38         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
  39         return 0;
  40 }
  41
  42 static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
  43         struct v4l2_tuner *v)
  44 {
  45         struct timbradio *tr = video_drvdata(file);
  46         return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
  47 }
  48
  49 static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
  50         const struct v4l2_tuner *v)
  51 {
  52         struct timbradio *tr = video_drvdata(file);
  53         return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
  54 }
  55
  56 static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
  57         const struct v4l2_frequency *f)
  58 {
  59         struct timbradio *tr = video_drvdata(file);
  60         return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
  61 }
  62
  63 static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
  64         struct v4l2_frequency *f)
  65 {
  66         struct timbradio *tr = video_drvdata(file);
  67         return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
  68 }
  69
  70 static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
  71         .vidioc_querycap        = timbradio_vidioc_querycap,
  72         .vidioc_g_tuner         = timbradio_vidioc_g_tuner,
  73         .vidioc_s_tuner         = timbradio_vidioc_s_tuner,
  74         .vidioc_g_frequency     = timbradio_vidioc_g_frequency,
  75         .vidioc_s_frequency     = timbradio_vidioc_s_frequency,
  76         .vidioc_log_status      = v4l2_ctrl_log_status,
  77         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
  78         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
  79 };
  80
  81 static const struct v4l2_file_operations timbradio_fops = {
  82         .owner          = THIS_MODULE,
  83         .open           = v4l2_fh_open,
  84         .release        = v4l2_fh_release,
  85         .poll           = v4l2_ctrl_poll,
  86         .unlocked_ioctl = video_ioctl2,
  87 };
  88
  89 static int timbradio_probe(struct platform_device *pdev)
  90 {
  91         struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
  92         struct timbradio *tr;
  93         int err;
  94
  95         if (!pdata) {
  96                 dev_err(&pdev->dev, "Platform data missing\n");
  97                 err = -EINVAL;
  98                 goto err;
  99         }
 100
 101         tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
 102         if (!tr) {
 103                 err = -ENOMEM;
 104                 goto err;
 105         }
 106
 107         tr->pdata = *pdata;
 108         mutex_init(&tr->lock);
 109
 110         strscpy(tr->video_dev.name, "Timberdale Radio",
 111                 sizeof(tr->video_dev.name));
 112         tr->video_dev.fops = &timbradio_fops;
 113         tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
 114         tr->video_dev.release = video_device_release_empty;
 115         tr->video_dev.minor = -1;
 116         tr->video_dev.lock = &tr->lock;
 117
 118         strscpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
 119         err = v4l2_device_register(NULL, &tr->v4l2_dev);
 120         if (err)
 121                 goto err;
 122
 123         tr->video_dev.v4l2_dev = &tr->v4l2_dev;
 124
 125         tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 126                 i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
 127         tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 128                 i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
 129         if (tr->sd_tuner == NULL || tr->sd_dsp == NULL) {
 130                 err = -ENODEV;
 131                 goto err_video_req;
 132         }
 133
 134         tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
 135
 136         err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
 137         if (err) {
 138                 dev_err(&pdev->dev, "Error reg video\n");
 139                 goto err_video_req;
 140         }
 141
 142         video_set_drvdata(&tr->video_dev, tr);
 143
 144         platform_set_drvdata(pdev, tr);
 145         return 0;
 146
 147 err_video_req:
 148         v4l2_device_unregister(&tr->v4l2_dev);
 149 err:
 150         dev_err(&pdev->dev, "Failed to register: %d\n", err);
 151
 152         return err;
 153 }
 154
 155 static int timbradio_remove(struct platform_device *pdev)
 156 {
 157         struct timbradio *tr = platform_get_drvdata(pdev);
 158
 159         video_unregister_device(&tr->video_dev);
 160         v4l2_device_unregister(&tr->v4l2_dev);
 161         return 0;
 162 }
 163
 164 static struct platform_driver timbradio_platform_driver = {
 165         .driver = {
 166                 .name   = DRIVER_NAME,
 167         },
 168         .probe          = timbradio_probe,
 169         .remove         = timbradio_remove,
 170 };
 171
 172 module_platform_driver(timbradio_platform_driver);
 173
 174 MODULE_DESCRIPTION("Timberdale Radio driver");
 175 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 176 MODULE_LICENSE("GPL v2");
 177 MODULE_VERSION("0.0.2");
 178 MODULE_ALIAS("platform:"DRIVER_NAME);