drivers/media/radio/si4713/radio-platform-si4713.c

   1 /*
   2  * drivers/media/radio/radio-si4713.c
   3  *
   4  * Platform Driver for Silicon Labs Si4713 FM Radio Transmitter:
   5  *
   6  * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT
   7  * Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/i2c.h>
  29 #include <linux/videodev2.h>
  30 #include <linux/slab.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-common.h>
  33 #include <media/v4l2-ioctl.h>
  34 #include <media/v4l2-fh.h>
  35 #include <media/v4l2-ctrls.h>
  36 #include <media/v4l2-event.h>
  37 #include "si4713.h"
  38
  39 /* module parameters */
  40 static int radio_nr = -1;       /* radio device minor (-1 ==> auto assign) */
  41 module_param(radio_nr, int, 0);
  42 MODULE_PARM_DESC(radio_nr,
  43                  "Minor number for radio device (-1 ==> auto assign)");
  44
  45 MODULE_LICENSE("GPL v2");
  46 MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
  47 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
  48 MODULE_VERSION("0.0.1");
  49 MODULE_ALIAS("platform:radio-si4713");
  50
  51 /* Driver state struct */
  52 struct radio_si4713_device {
  53         struct v4l2_device              v4l2_dev;
  54         struct video_device             radio_dev;
  55         struct mutex lock;
  56 };
  57
  58 /* radio_si4713_fops - file operations interface */
  59 static const struct v4l2_file_operations radio_si4713_fops = {
  60         .owner          = THIS_MODULE,
  61         .open = v4l2_fh_open,
  62         .release = v4l2_fh_release,
  63         .poll = v4l2_ctrl_poll,
  64         /* Note: locking is done at the subdev level in the i2c driver. */
  65         .unlocked_ioctl = video_ioctl2,
  66 };
  67
  68 /* Video4Linux Interface */
  69
  70 /* radio_si4713_querycap - query device capabilities */
  71 static int radio_si4713_querycap(struct file *file, void *priv,
  72                                         struct v4l2_capability *capability)
  73 {
  74         strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
  75         strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
  76                 sizeof(capability->card));
  77         strlcpy(capability->bus_info, "platform:radio-si4713",
  78                 sizeof(capability->bus_info));
  79         capability->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
  80         capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
  81
  82         return 0;
  83 }
  84
  85 /*
  86  * v4l2 ioctl call backs.
  87  * we are just a wrapper for v4l2_sub_devs.
  88  */
  89 static inline struct v4l2_device *get_v4l2_dev(struct file *file)
  90 {
  91         return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
  92 }
  93
  94 static int radio_si4713_g_modulator(struct file *file, void *p,
  95                                     struct v4l2_modulator *vm)
  96 {
  97         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
  98                                           g_modulator, vm);
  99 }
 100
 101 static int radio_si4713_s_modulator(struct file *file, void *p,
 102                                     const struct v4l2_modulator *vm)
 103 {
 104         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 105                                           s_modulator, vm);
 106 }
 107
 108 static int radio_si4713_g_frequency(struct file *file, void *p,
 109                                     struct v4l2_frequency *vf)
 110 {
 111         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 112                                           g_frequency, vf);
 113 }
 114
 115 static int radio_si4713_s_frequency(struct file *file, void *p,
 116                                     const struct v4l2_frequency *vf)
 117 {
 118         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 119                                           s_frequency, vf);
 120 }
 121
 122 static long radio_si4713_default(struct file *file, void *p,
 123                                  bool valid_prio, unsigned int cmd, void *arg)
 124 {
 125         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 126                                           ioctl, cmd, arg);
 127 }
 128
 129 static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
 130         .vidioc_querycap        = radio_si4713_querycap,
 131         .vidioc_g_modulator     = radio_si4713_g_modulator,
 132         .vidioc_s_modulator     = radio_si4713_s_modulator,
 133         .vidioc_g_frequency     = radio_si4713_g_frequency,
 134         .vidioc_s_frequency     = radio_si4713_s_frequency,
 135         .vidioc_log_status      = v4l2_ctrl_log_status,
 136         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 137         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 138         .vidioc_default         = radio_si4713_default,
 139 };
 140
 141 /* radio_si4713_vdev_template - video device interface */
 142 static struct video_device radio_si4713_vdev_template = {
 143         .fops                   = &radio_si4713_fops,
 144         .name                   = "radio-si4713",
 145         .release                = video_device_release_empty,
 146         .ioctl_ops              = &radio_si4713_ioctl_ops,
 147         .vfl_dir                = VFL_DIR_TX,
 148 };
 149
 150 /* Platform driver interface */
 151 /* radio_si4713_pdriver_probe - probe for the device */
 152 static int radio_si4713_pdriver_probe(struct platform_device *pdev)
 153 {
 154         struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
 155         struct radio_si4713_device *rsdev;
 156         struct v4l2_subdev *sd;
 157         int rval = 0;
 158
 159         if (!pdata) {
 160                 dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
 161                 rval = -EINVAL;
 162                 goto exit;
 163         }
 164
 165         rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
 166         if (!rsdev) {
 167                 dev_err(&pdev->dev, "Failed to alloc video device.\n");
 168                 rval = -ENOMEM;
 169                 goto exit;
 170         }
 171         mutex_init(&rsdev->lock);
 172
 173         rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
 174         if (rval) {
 175                 dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
 176                 goto exit;
 177         }
 178
 179         sd = i2c_get_clientdata(pdata->subdev);
 180         rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
 181         if (rval) {
 182                 dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
 183                 goto unregister_v4l2_dev;
 184         }
 185
 186         rsdev->radio_dev = radio_si4713_vdev_template;
 187         rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
 188         rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
 189         /* Serialize all access to the si4713 */
 190         rsdev->radio_dev.lock = &rsdev->lock;
 191         video_set_drvdata(&rsdev->radio_dev, rsdev);
 192         if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
 193                 dev_err(&pdev->dev, "Could not register video device.\n");
 194                 rval = -EIO;
 195                 goto unregister_v4l2_dev;
 196         }
 197         dev_info(&pdev->dev, "New device successfully probed\n");
 198
 199         goto exit;
 200
 201 unregister_v4l2_dev:
 202         v4l2_device_unregister(&rsdev->v4l2_dev);
 203 exit:
 204         return rval;
 205 }
 206
 207 /* radio_si4713_pdriver_remove - remove the device */
 208 static int radio_si4713_pdriver_remove(struct platform_device *pdev)
 209 {
 210         struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
 211         struct radio_si4713_device *rsdev;
 212
 213         rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
 214         video_unregister_device(&rsdev->radio_dev);
 215         v4l2_device_unregister(&rsdev->v4l2_dev);
 216
 217         return 0;
 218 }
 219
 220 static struct platform_driver radio_si4713_pdriver = {
 221         .driver         = {
 222                 .name   = "radio-si4713",
 223         },
 224         .probe          = radio_si4713_pdriver_probe,
 225         .remove         = radio_si4713_pdriver_remove,
 226 };
 227
 228 module_platform_driver(radio_si4713_pdriver);