kernel/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 <media/v4l2-ctrls.h>
  23 #include <media/v4l2-event.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/slab.h>
  27 #include <linux/i2c.h>
  28 #include <linux/module.h>
  29 #include <media/timb_radio.h>
  30
  31 #define DRIVER_NAME "timb-radio"
  32
  33 struct timbradio {
  34         struct timb_radio_platform_data pdata;
  35         struct v4l2_subdev      *sd_tuner;
  36         struct v4l2_subdev      *sd_dsp;
  37         struct video_device     video_dev;
  38         struct v4l2_device      v4l2_dev;
  39         struct mutex            lock;
  40 };
  41
  42
  43 static int timbradio_vidioc_querycap(struct file *file, void  *priv,
  44         struct v4l2_capability *v)
  45 {
  46         strlcpy(v->driver, DRIVER_NAME, sizeof(v->driver));
  47         strlcpy(v->card, "Timberdale Radio", sizeof(v->card));
  48         snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
  49         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
  50         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
  51         return 0;
  52 }
  53
  54 static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
  55         struct v4l2_tuner *v)
  56 {
  57         struct timbradio *tr = video_drvdata(file);
  58         return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
  59 }
  60
  61 static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
  62         const struct v4l2_tuner *v)
  63 {
  64         struct timbradio *tr = video_drvdata(file);
  65         return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
  66 }
  67
  68 static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
  69         const struct v4l2_frequency *f)
  70 {
  71         struct timbradio *tr = video_drvdata(file);
  72         return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
  73 }
  74
  75 static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
  76         struct v4l2_frequency *f)
  77 {
  78         struct timbradio *tr = video_drvdata(file);
  79         return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
  80 }
  81
  82 static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
  83         .vidioc_querycap        = timbradio_vidioc_querycap,
  84         .vidioc_g_tuner         = timbradio_vidioc_g_tuner,
  85         .vidioc_s_tuner         = timbradio_vidioc_s_tuner,
  86         .vidioc_g_frequency     = timbradio_vidioc_g_frequency,
  87         .vidioc_s_frequency     = timbradio_vidioc_s_frequency,
  88         .vidioc_log_status      = v4l2_ctrl_log_status,
  89         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
  90         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
  91 };
  92
  93 static const struct v4l2_file_operations timbradio_fops = {
  94         .owner          = THIS_MODULE,
  95         .open           = v4l2_fh_open,
  96         .release        = v4l2_fh_release,
  97         .poll           = v4l2_ctrl_poll,
  98         .unlocked_ioctl = video_ioctl2,
  99 };
 100
 101 static int timbradio_probe(struct platform_device *pdev)
 102 {
 103         struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
 104         struct timbradio *tr;
 105         int err;
 106
 107         if (!pdata) {
 108                 dev_err(&pdev->dev, "Platform data missing\n");
 109                 err = -EINVAL;
 110                 goto err;
 111         }
 112
 113         tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
 114         if (!tr) {
 115                 err = -ENOMEM;
 116                 goto err;
 117         }
 118
 119         tr->pdata = *pdata;
 120         mutex_init(&tr->lock);
 121
 122         strlcpy(tr->video_dev.name, "Timberdale Radio",
 123                 sizeof(tr->video_dev.name));
 124         tr->video_dev.fops = &timbradio_fops;
 125         tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
 126         tr->video_dev.release = video_device_release_empty;
 127         tr->video_dev.minor = -1;
 128         tr->video_dev.lock = &tr->lock;
 129
 130         strlcpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
 131         err = v4l2_device_register(NULL, &tr->v4l2_dev);
 132         if (err)
 133                 goto err;
 134
 135         tr->video_dev.v4l2_dev = &tr->v4l2_dev;
 136
 137         tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 138                 i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
 139         tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 140                 i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
 141         if (tr->sd_tuner == NULL || tr->sd_dsp == NULL)
 142                 goto err_video_req;
 143
 144         tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
 145
 146         err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
 147         if (err) {
 148                 dev_err(&pdev->dev, "Error reg video\n");
 149                 goto err_video_req;
 150         }
 151
 152         video_set_drvdata(&tr->video_dev, tr);
 153
 154         platform_set_drvdata(pdev, tr);
 155         return 0;
 156
 157 err_video_req:
 158         v4l2_device_unregister(&tr->v4l2_dev);
 159 err:
 160         dev_err(&pdev->dev, "Failed to register: %d\n", err);
 161
 162         return err;
 163 }
 164
 165 static int timbradio_remove(struct platform_device *pdev)
 166 {
 167         struct timbradio *tr = platform_get_drvdata(pdev);
 168
 169         video_unregister_device(&tr->video_dev);
 170         v4l2_device_unregister(&tr->v4l2_dev);
 171         return 0;
 172 }
 173
 174 static struct platform_driver timbradio_platform_driver = {
 175         .driver = {
 176                 .name   = DRIVER_NAME,
 177         },
 178         .probe          = timbradio_probe,
 179         .remove         = timbradio_remove,
 180 };
 181
 182 module_platform_driver(timbradio_platform_driver);
 183
 184 MODULE_DESCRIPTION("Timberdale Radio driver");
 185 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 186 MODULE_LICENSE("GPL v2");
 187 MODULE_VERSION("0.0.2");
 188 MODULE_ALIAS("platform:"DRIVER_NAME);