drivers/media/radio/radio-timb.c

   1 /*
   2  * radio-timb.c Timberdale FPGA Radio driver
   3  * Copyright (c) 2009 Intel Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/io.h>
  16 #include <media/v4l2-ioctl.h>
  17 #include <media/v4l2-device.h>
  18 #include <media/v4l2-ctrls.h>
  19 #include <media/v4l2-event.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23 #include <linux/i2c.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_data/media/timb_radio.h>
  26
  27 #define DRIVER_NAME "timb-radio"
  28
  29 struct timbradio {
  30         struct timb_radio_platform_data pdata;
  31         struct v4l2_subdev      *sd_tuner;
  32         struct v4l2_subdev      *sd_dsp;
  33         struct video_device     video_dev;
  34         struct v4l2_device      v4l2_dev;
  35         struct mutex            lock;
  36 };
  37
  38
  39 static int timbradio_vidioc_querycap(struct file *file, void  *priv,
  40         struct v4l2_capability *v)
  41 {
  42         strscpy(v->driver, DRIVER_NAME, sizeof(v->driver));
  43         strscpy(v->card, "Timberdale Radio", sizeof(v->card));
  44         snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
  45         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
  46         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
  47         return 0;
  48 }
  49
  50 static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
  51         struct v4l2_tuner *v)
  52 {
  53         struct timbradio *tr = video_drvdata(file);
  54         return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
  55 }
  56
  57 static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
  58         const struct v4l2_tuner *v)
  59 {
  60         struct timbradio *tr = video_drvdata(file);
  61         return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
  62 }
  63
  64 static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
  65         const struct v4l2_frequency *f)
  66 {
  67         struct timbradio *tr = video_drvdata(file);
  68         return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
  69 }
  70
  71 static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
  72         struct v4l2_frequency *f)
  73 {
  74         struct timbradio *tr = video_drvdata(file);
  75         return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
  76 }
  77
  78 static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
  79         .vidioc_querycap        = timbradio_vidioc_querycap,
  80         .vidioc_g_tuner         = timbradio_vidioc_g_tuner,
  81         .vidioc_s_tuner         = timbradio_vidioc_s_tuner,
  82         .vidioc_g_frequency     = timbradio_vidioc_g_frequency,
  83         .vidioc_s_frequency     = timbradio_vidioc_s_frequency,
  84         .vidioc_log_status      = v4l2_ctrl_log_status,
  85         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
  86         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
  87 };
  88
  89 static const struct v4l2_file_operations timbradio_fops = {
  90         .owner          = THIS_MODULE,
  91         .open           = v4l2_fh_open,
  92         .release        = v4l2_fh_release,
  93         .poll           = v4l2_ctrl_poll,
  94         .unlocked_ioctl = video_ioctl2,
  95 };
  96
  97 static int timbradio_probe(struct platform_device *pdev)
  98 {
  99         struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
 100         struct timbradio *tr;
 101         int err;
 102
 103         if (!pdata) {
 104                 dev_err(&pdev->dev, "Platform data missing\n");
 105                 err = -EINVAL;
 106                 goto err;
 107         }
 108
 109         tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
 110         if (!tr) {
 111                 err = -ENOMEM;
 112                 goto err;
 113         }
 114
 115         tr->pdata = *pdata;
 116         mutex_init(&tr->lock);
 117
 118         strscpy(tr->video_dev.name, "Timberdale Radio",
 119                 sizeof(tr->video_dev.name));
 120         tr->video_dev.fops = &timbradio_fops;
 121         tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
 122         tr->video_dev.release = video_device_release_empty;
 123         tr->video_dev.minor = -1;
 124         tr->video_dev.lock = &tr->lock;
 125
 126         strscpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
 127         err = v4l2_device_register(NULL, &tr->v4l2_dev);
 128         if (err)
 129                 goto err;
 130
 131         tr->video_dev.v4l2_dev = &tr->v4l2_dev;
 132
 133         tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 134                 i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
 135         tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 136                 i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
 137         if (tr->sd_tuner == NULL || tr->sd_dsp == NULL) {
 138                 err = -ENODEV;
 139                 goto err_video_req;
 140         }
 141
 142         tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
 143
 144         err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
 145         if (err) {
 146                 dev_err(&pdev->dev, "Error reg video\n");
 147                 goto err_video_req;
 148         }
 149
 150         video_set_drvdata(&tr->video_dev, tr);
 151
 152         platform_set_drvdata(pdev, tr);
 153         return 0;
 154
 155 err_video_req:
 156         v4l2_device_unregister(&tr->v4l2_dev);
 157 err:
 158         dev_err(&pdev->dev, "Failed to register: %d\n", err);
 159
 160         return err;
 161 }
 162
 163 static int timbradio_remove(struct platform_device *pdev)
 164 {
 165         struct timbradio *tr = platform_get_drvdata(pdev);
 166
 167         video_unregister_device(&tr->video_dev);
 168         v4l2_device_unregister(&tr->v4l2_dev);
 169         return 0;
 170 }
 171
 172 static struct platform_driver timbradio_platform_driver = {
 173         .driver = {
 174                 .name   = DRIVER_NAME,
 175         },
 176         .probe          = timbradio_probe,
 177         .remove         = timbradio_remove,
 178 };
 179
 180 module_platform_driver(timbradio_platform_driver);
 181
 182 MODULE_DESCRIPTION("Timberdale Radio driver");
 183 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 184 MODULE_LICENSE("GPL v2");
 185 MODULE_VERSION("0.0.2");
 186 MODULE_ALIAS("platform:"DRIVER_NAME);