drivers/media/radio/radio-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 <media/v4l2-device.h>
  31 #include <media/v4l2-common.h>
  32 #include <media/v4l2-ioctl.h>
  33 #include <media/radio-si4713.h>
  34
  35 /* module parameters */
  36 static int radio_nr = -1;       /* radio device minor (-1 ==> auto assign) */
  37 module_param(radio_nr, int, 0);
  38 MODULE_PARM_DESC(radio_nr,
  39                  "Minor number for radio device (-1 ==> auto assign)");
  40
  41 MODULE_LICENSE("GPL");
  42 MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
  43 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
  44 MODULE_VERSION("0.0.1");
  45
  46 /* Driver state struct */
  47 struct radio_si4713_device {
  48         struct v4l2_device              v4l2_dev;
  49         struct video_device             *radio_dev;
  50 };
  51
  52 /* radio_si4713_fops - file operations interface */
  53 static const struct v4l2_file_operations radio_si4713_fops = {
  54         .owner          = THIS_MODULE,
  55         .ioctl          = video_ioctl2,
  56 };
  57
  58 /* Video4Linux Interface */
  59 static int radio_si4713_fill_audout(struct v4l2_audioout *vao)
  60 {
  61         /* TODO: check presence of audio output */
  62         strlcpy(vao->name, "FM Modulator Audio Out", 32);
  63
  64         return 0;
  65 }
  66
  67 static int radio_si4713_enumaudout(struct file *file, void *priv,
  68                                                 struct v4l2_audioout *vao)
  69 {
  70         return radio_si4713_fill_audout(vao);
  71 }
  72
  73 static int radio_si4713_g_audout(struct file *file, void *priv,
  74                                         struct v4l2_audioout *vao)
  75 {
  76         int rval = radio_si4713_fill_audout(vao);
  77
  78         vao->index = 0;
  79
  80         return rval;
  81 }
  82
  83 static int radio_si4713_s_audout(struct file *file, void *priv,
  84                                         struct v4l2_audioout *vao)
  85 {
  86         return vao->index ? -EINVAL : 0;
  87 }
  88
  89 /* radio_si4713_querycap - query device capabilities */
  90 static int radio_si4713_querycap(struct file *file, void *priv,
  91                                         struct v4l2_capability *capability)
  92 {
  93         struct radio_si4713_device *rsdev;
  94
  95         rsdev = video_get_drvdata(video_devdata(file));
  96
  97         strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
  98         strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
  99                                 sizeof(capability->card));
 100         capability->capabilities = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
 101
 102         return 0;
 103 }
 104
 105 /* radio_si4713_queryctrl - enumerate control items */
 106 static int radio_si4713_queryctrl(struct file *file, void *priv,
 107                                                 struct v4l2_queryctrl *qc)
 108 {
 109         /* Must be sorted from low to high control ID! */
 110         static const u32 user_ctrls[] = {
 111                 V4L2_CID_USER_CLASS,
 112                 V4L2_CID_AUDIO_MUTE,
 113                 0
 114         };
 115
 116         /* Must be sorted from low to high control ID! */
 117         static const u32 fmtx_ctrls[] = {
 118                 V4L2_CID_FM_TX_CLASS,
 119                 V4L2_CID_RDS_TX_DEVIATION,
 120                 V4L2_CID_RDS_TX_PI,
 121                 V4L2_CID_RDS_TX_PTY,
 122                 V4L2_CID_RDS_TX_PS_NAME,
 123                 V4L2_CID_RDS_TX_RADIO_TEXT,
 124                 V4L2_CID_AUDIO_LIMITER_ENABLED,
 125                 V4L2_CID_AUDIO_LIMITER_RELEASE_TIME,
 126                 V4L2_CID_AUDIO_LIMITER_DEVIATION,
 127                 V4L2_CID_AUDIO_COMPRESSION_ENABLED,
 128                 V4L2_CID_AUDIO_COMPRESSION_GAIN,
 129                 V4L2_CID_AUDIO_COMPRESSION_THRESHOLD,
 130                 V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME,
 131                 V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME,
 132                 V4L2_CID_PILOT_TONE_ENABLED,
 133                 V4L2_CID_PILOT_TONE_DEVIATION,
 134                 V4L2_CID_PILOT_TONE_FREQUENCY,
 135                 V4L2_CID_TUNE_PREEMPHASIS,
 136                 V4L2_CID_TUNE_POWER_LEVEL,
 137                 V4L2_CID_TUNE_ANTENNA_CAPACITOR,
 138                 0
 139         };
 140         static const u32 *ctrl_classes[] = {
 141                 user_ctrls,
 142                 fmtx_ctrls,
 143                 NULL
 144         };
 145         struct radio_si4713_device *rsdev;
 146
 147         rsdev = video_get_drvdata(video_devdata(file));
 148
 149         qc->id = v4l2_ctrl_next(ctrl_classes, qc->id);
 150         if (qc->id == 0)
 151                 return -EINVAL;
 152
 153         if (qc->id == V4L2_CID_USER_CLASS || qc->id == V4L2_CID_FM_TX_CLASS)
 154                 return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0);
 155
 156         return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core,
 157                                                 queryctrl, qc);
 158 }
 159
 160 /*
 161  * v4l2 ioctl call backs.
 162  * we are just a wrapper for v4l2_sub_devs.
 163  */
 164 static inline struct v4l2_device *get_v4l2_dev(struct file *file)
 165 {
 166         return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
 167 }
 168
 169 static int radio_si4713_g_ext_ctrls(struct file *file, void *p,
 170                                                 struct v4l2_ext_controls *vecs)
 171 {
 172         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 173                                                         g_ext_ctrls, vecs);
 174 }
 175
 176 static int radio_si4713_s_ext_ctrls(struct file *file, void *p,
 177                                                 struct v4l2_ext_controls *vecs)
 178 {
 179         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 180                                                         s_ext_ctrls, vecs);
 181 }
 182
 183 static int radio_si4713_g_ctrl(struct file *file, void *p,
 184                                                 struct v4l2_control *vc)
 185 {
 186         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 187                                                         g_ctrl, vc);
 188 }
 189
 190 static int radio_si4713_s_ctrl(struct file *file, void *p,
 191                                                 struct v4l2_control *vc)
 192 {
 193         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 194                                                         s_ctrl, vc);
 195 }
 196
 197 static int radio_si4713_g_modulator(struct file *file, void *p,
 198                                                 struct v4l2_modulator *vm)
 199 {
 200         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 201                                                         g_modulator, vm);
 202 }
 203
 204 static int radio_si4713_s_modulator(struct file *file, void *p,
 205                                                 struct v4l2_modulator *vm)
 206 {
 207         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 208                                                         s_modulator, vm);
 209 }
 210
 211 static int radio_si4713_g_frequency(struct file *file, void *p,
 212                                                 struct v4l2_frequency *vf)
 213 {
 214         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 215                                                         g_frequency, vf);
 216 }
 217
 218 static int radio_si4713_s_frequency(struct file *file, void *p,
 219                                                 struct v4l2_frequency *vf)
 220 {
 221         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 222                                                         s_frequency, vf);
 223 }
 224
 225 static long radio_si4713_default(struct file *file, void *p, int cmd, void *arg)
 226 {
 227         return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 228                                                         ioctl, cmd, arg);
 229 }
 230
 231 static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
 232         .vidioc_enumaudout      = radio_si4713_enumaudout,
 233         .vidioc_g_audout        = radio_si4713_g_audout,
 234         .vidioc_s_audout        = radio_si4713_s_audout,
 235         .vidioc_querycap        = radio_si4713_querycap,
 236         .vidioc_queryctrl       = radio_si4713_queryctrl,
 237         .vidioc_g_ext_ctrls     = radio_si4713_g_ext_ctrls,
 238         .vidioc_s_ext_ctrls     = radio_si4713_s_ext_ctrls,
 239         .vidioc_g_ctrl          = radio_si4713_g_ctrl,
 240         .vidioc_s_ctrl          = radio_si4713_s_ctrl,
 241         .vidioc_g_modulator     = radio_si4713_g_modulator,
 242         .vidioc_s_modulator     = radio_si4713_s_modulator,
 243         .vidioc_g_frequency     = radio_si4713_g_frequency,
 244         .vidioc_s_frequency     = radio_si4713_s_frequency,
 245         .vidioc_default         = radio_si4713_default,
 246 };
 247
 248 /* radio_si4713_vdev_template - video device interface */
 249 static struct video_device radio_si4713_vdev_template = {
 250         .fops                   = &radio_si4713_fops,
 251         .name                   = "radio-si4713",
 252         .release                = video_device_release,
 253         .ioctl_ops              = &radio_si4713_ioctl_ops,
 254 };
 255
 256 /* Platform driver interface */
 257 /* radio_si4713_pdriver_probe - probe for the device */
 258 static int radio_si4713_pdriver_probe(struct platform_device *pdev)
 259 {
 260         struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
 261         struct radio_si4713_device *rsdev;
 262         struct i2c_adapter *adapter;
 263         struct v4l2_subdev *sd;
 264         int rval = 0;
 265
 266         if (!pdata) {
 267                 dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
 268                 rval = -EINVAL;
 269                 goto exit;
 270         }
 271
 272         rsdev = kzalloc(sizeof *rsdev, GFP_KERNEL);
 273         if (!rsdev) {
 274                 dev_err(&pdev->dev, "Failed to alloc video device.\n");
 275                 rval = -ENOMEM;
 276                 goto exit;
 277         }
 278
 279         rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
 280         if (rval) {
 281                 dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
 282                 goto free_rsdev;
 283         }
 284
 285         adapter = i2c_get_adapter(pdata->i2c_bus);
 286         if (!adapter) {
 287                 dev_err(&pdev->dev, "Cannot get i2c adapter %d\n",
 288                                                         pdata->i2c_bus);
 289                 rval = -ENODEV;
 290                 goto unregister_v4l2_dev;
 291         }
 292
 293         sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter, "si4713_i2c",
 294                                         pdata->subdev_board_info, NULL);
 295         if (!sd) {
 296                 dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
 297                 rval = -ENODEV;
 298                 goto unregister_v4l2_dev;
 299         }
 300
 301         rsdev->radio_dev = video_device_alloc();
 302         if (!rsdev->radio_dev) {
 303                 dev_err(&pdev->dev, "Failed to alloc video device.\n");
 304                 rval = -ENOMEM;
 305                 goto unregister_v4l2_dev;
 306         }
 307
 308         memcpy(rsdev->radio_dev, &radio_si4713_vdev_template,
 309                         sizeof(radio_si4713_vdev_template));
 310         video_set_drvdata(rsdev->radio_dev, rsdev);
 311         if (video_register_device(rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
 312                 dev_err(&pdev->dev, "Could not register video device.\n");
 313                 rval = -EIO;
 314                 goto free_vdev;
 315         }
 316         dev_info(&pdev->dev, "New device successfully probed\n");
 317
 318         goto exit;
 319
 320 free_vdev:
 321         video_device_release(rsdev->radio_dev);
 322 unregister_v4l2_dev:
 323         v4l2_device_unregister(&rsdev->v4l2_dev);
 324 free_rsdev:
 325         kfree(rsdev);
 326 exit:
 327         return rval;
 328 }
 329
 330 /* radio_si4713_pdriver_remove - remove the device */
 331 static int __exit radio_si4713_pdriver_remove(struct platform_device *pdev)
 332 {
 333         struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
 334         struct radio_si4713_device *rsdev = container_of(v4l2_dev,
 335                                                 struct radio_si4713_device,
 336                                                 v4l2_dev);
 337
 338         video_unregister_device(rsdev->radio_dev);
 339         v4l2_device_unregister(&rsdev->v4l2_dev);
 340         kfree(rsdev);
 341
 342         return 0;
 343 }
 344
 345 static struct platform_driver radio_si4713_pdriver = {
 346         .driver         = {
 347                 .name   = "radio-si4713",
 348         },
 349         .probe          = radio_si4713_pdriver_probe,
 350         .remove         = __exit_p(radio_si4713_pdriver_remove),
 351 };
 352
 353 /* Module Interface */
 354 static int __init radio_si4713_module_init(void)
 355 {
 356         return platform_driver_register(&radio_si4713_pdriver);
 357 }
 358
 359 static void __exit radio_si4713_module_exit(void)
 360 {
 361         platform_driver_unregister(&radio_si4713_pdriver);
 362 }
 363
 364 module_init(radio_si4713_module_init);
 365 module_exit(radio_si4713_module_exit);
 366