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  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #include <linux/io.h>
  20 #include <media/v4l2-ioctl.h>
  21 #include <media/v4l2-device.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/slab.h>
  25 #include <linux/i2c.h>
  26 #include <linux/module.h>
  27 #include <media/timb_radio.h>
  28
  29 #define DRIVER_NAME "timb-radio"
  30
  31 struct timbradio {
  32         struct timb_radio_platform_data pdata;
  33         struct v4l2_subdev      *sd_tuner;
  34         struct v4l2_subdev      *sd_dsp;
  35         struct video_device     video_dev;
  36         struct v4l2_device      v4l2_dev;
  37         struct mutex            lock;
  38 };
  39
  40
  41 static int timbradio_vidioc_querycap(struct file *file, void  *priv,
  42         struct v4l2_capability *v)
  43 {
  44         strlcpy(v->driver, DRIVER_NAME, sizeof(v->driver));
  45         strlcpy(v->card, "Timberdale Radio", sizeof(v->card));
  46         snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
  47         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
  48         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
  49         return 0;
  50 }
  51
  52 static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
  53         struct v4l2_tuner *v)
  54 {
  55         struct timbradio *tr = video_drvdata(file);
  56         return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
  57 }
  58
  59 static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
  60         const struct v4l2_tuner *v)
  61 {
  62         struct timbradio *tr = video_drvdata(file);
  63         return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
  64 }
  65
  66 static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
  67         const struct v4l2_frequency *f)
  68 {
  69         struct timbradio *tr = video_drvdata(file);
  70         return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
  71 }
  72
  73 static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
  74         struct v4l2_frequency *f)
  75 {
  76         struct timbradio *tr = video_drvdata(file);
  77         return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
  78 }
  79
  80 static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
  81         .vidioc_querycap        = timbradio_vidioc_querycap,
  82         .vidioc_g_tuner         = timbradio_vidioc_g_tuner,
  83         .vidioc_s_tuner         = timbradio_vidioc_s_tuner,
  84         .vidioc_g_frequency     = timbradio_vidioc_g_frequency,
  85         .vidioc_s_frequency     = timbradio_vidioc_s_frequency,
  86 };
  87
  88 static const struct v4l2_file_operations timbradio_fops = {
  89         .owner          = THIS_MODULE,
  90         .unlocked_ioctl = video_ioctl2,
  91 };
  92
  93 static int timbradio_probe(struct platform_device *pdev)
  94 {
  95         struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
  96         struct timbradio *tr;
  97         int err;
  98
  99         if (!pdata) {
 100                 dev_err(&pdev->dev, "Platform data missing\n");
 101                 err = -EINVAL;
 102                 goto err;
 103         }
 104
 105         tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
 106         if (!tr) {
 107                 err = -ENOMEM;
 108                 goto err;
 109         }
 110
 111         tr->pdata = *pdata;
 112         mutex_init(&tr->lock);
 113
 114         strlcpy(tr->video_dev.name, "Timberdale Radio",
 115                 sizeof(tr->video_dev.name));
 116         tr->video_dev.fops = &timbradio_fops;
 117         tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
 118         tr->video_dev.release = video_device_release_empty;
 119         tr->video_dev.minor = -1;
 120         tr->video_dev.lock = &tr->lock;
 121
 122         strlcpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
 123         err = v4l2_device_register(NULL, &tr->v4l2_dev);
 124         if (err)
 125                 goto err;
 126
 127         tr->video_dev.v4l2_dev = &tr->v4l2_dev;
 128
 129         tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 130                 i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
 131         tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 132                 i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
 133         if (tr->sd_tuner == NULL || tr->sd_dsp == NULL)
 134                 goto err_video_req;
 135
 136         tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
 137
 138         err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
 139         if (err) {
 140                 dev_err(&pdev->dev, "Error reg video\n");
 141                 goto err_video_req;
 142         }
 143
 144         video_set_drvdata(&tr->video_dev, tr);
 145
 146         platform_set_drvdata(pdev, tr);
 147         return 0;
 148
 149 err_video_req:
 150         v4l2_device_unregister(&tr->v4l2_dev);
 151 err:
 152         dev_err(&pdev->dev, "Failed to register: %d\n", err);
 153
 154         return err;
 155 }
 156
 157 static int timbradio_remove(struct platform_device *pdev)
 158 {
 159         struct timbradio *tr = platform_get_drvdata(pdev);
 160
 161         video_unregister_device(&tr->video_dev);
 162         v4l2_device_unregister(&tr->v4l2_dev);
 163         return 0;
 164 }
 165
 166 static struct platform_driver timbradio_platform_driver = {
 167         .driver = {
 168                 .name   = DRIVER_NAME,
 169                 .owner  = THIS_MODULE,
 170         },
 171         .probe          = timbradio_probe,
 172         .remove         = timbradio_remove,
 173 };
 174
 175 module_platform_driver(timbradio_platform_driver);
 176
 177 MODULE_DESCRIPTION("Timberdale Radio driver");
 178 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 179 MODULE_LICENSE("GPL v2");
 180 MODULE_VERSION("0.0.2");
 181 MODULE_ALIAS("platform:"DRIVER_NAME);