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radio-si4713.c
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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 <[email protected]>
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/radio-si4713.h>
35 
36 /* module parameters */
37 static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */
38 module_param(radio_nr, int, 0);
39 MODULE_PARM_DESC(radio_nr,
40  "Minor number for radio device (-1 ==> auto assign)");
41 
42 MODULE_LICENSE("GPL");
43 MODULE_AUTHOR("Eduardo Valentin <[email protected]>");
44 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
45 MODULE_VERSION("0.0.1");
46 
47 /* Driver state struct */
48 struct radio_si4713_device {
49  struct v4l2_device v4l2_dev;
50  struct video_device *radio_dev;
51 };
52 
53 /* radio_si4713_fops - file operations interface */
54 static const struct v4l2_file_operations radio_si4713_fops = {
55  .owner = THIS_MODULE,
56  /* Note: locking is done at the subdev level in the i2c driver. */
57  .unlocked_ioctl = video_ioctl2,
58 };
59 
60 /* Video4Linux Interface */
61 static int radio_si4713_fill_audout(struct v4l2_audioout *vao)
62 {
63  /* TODO: check presence of audio output */
64  strlcpy(vao->name, "FM Modulator Audio Out", 32);
65 
66  return 0;
67 }
68 
69 static int radio_si4713_enumaudout(struct file *file, void *priv,
70  struct v4l2_audioout *vao)
71 {
72  return radio_si4713_fill_audout(vao);
73 }
74 
75 static int radio_si4713_g_audout(struct file *file, void *priv,
76  struct v4l2_audioout *vao)
77 {
78  int rval = radio_si4713_fill_audout(vao);
79 
80  vao->index = 0;
81 
82  return rval;
83 }
84 
85 static int radio_si4713_s_audout(struct file *file, void *priv,
86  const struct v4l2_audioout *vao)
87 {
88  return vao->index ? -EINVAL : 0;
89 }
90 
91 /* radio_si4713_querycap - query device capabilities */
92 static int radio_si4713_querycap(struct file *file, void *priv,
93  struct v4l2_capability *capability)
94 {
95  strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
96  strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
97  sizeof(capability->card));
98  capability->capabilities = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
99 
100  return 0;
101 }
102 
103 /* radio_si4713_queryctrl - enumerate control items */
104 static int radio_si4713_queryctrl(struct file *file, void *priv,
105  struct v4l2_queryctrl *qc)
106 {
107  /* Must be sorted from low to high control ID! */
108  static const u32 user_ctrls[] = {
109  V4L2_CID_USER_CLASS,
110  V4L2_CID_AUDIO_MUTE,
111  0
112  };
113 
114  /* Must be sorted from low to high control ID! */
115  static const u32 fmtx_ctrls[] = {
116  V4L2_CID_FM_TX_CLASS,
117  V4L2_CID_RDS_TX_DEVIATION,
118  V4L2_CID_RDS_TX_PI,
119  V4L2_CID_RDS_TX_PTY,
120  V4L2_CID_RDS_TX_PS_NAME,
121  V4L2_CID_RDS_TX_RADIO_TEXT,
122  V4L2_CID_AUDIO_LIMITER_ENABLED,
123  V4L2_CID_AUDIO_LIMITER_RELEASE_TIME,
124  V4L2_CID_AUDIO_LIMITER_DEVIATION,
125  V4L2_CID_AUDIO_COMPRESSION_ENABLED,
126  V4L2_CID_AUDIO_COMPRESSION_GAIN,
127  V4L2_CID_AUDIO_COMPRESSION_THRESHOLD,
128  V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME,
129  V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME,
130  V4L2_CID_PILOT_TONE_ENABLED,
131  V4L2_CID_PILOT_TONE_DEVIATION,
132  V4L2_CID_PILOT_TONE_FREQUENCY,
133  V4L2_CID_TUNE_PREEMPHASIS,
134  V4L2_CID_TUNE_POWER_LEVEL,
135  V4L2_CID_TUNE_ANTENNA_CAPACITOR,
136  0
137  };
138  static const u32 *ctrl_classes[] = {
139  user_ctrls,
140  fmtx_ctrls,
141  NULL
142  };
143  struct radio_si4713_device *rsdev;
144 
145  rsdev = video_get_drvdata(video_devdata(file));
146 
147  qc->id = v4l2_ctrl_next(ctrl_classes, qc->id);
148  if (qc->id == 0)
149  return -EINVAL;
150 
151  if (qc->id == V4L2_CID_USER_CLASS || qc->id == V4L2_CID_FM_TX_CLASS)
152  return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0);
153 
154  return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core,
155  queryctrl, qc);
156 }
157 
158 /*
159  * v4l2 ioctl call backs.
160  * we are just a wrapper for v4l2_sub_devs.
161  */
162 static inline struct v4l2_device *get_v4l2_dev(struct file *file)
163 {
164  return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
165 }
166 
167 static int radio_si4713_g_ext_ctrls(struct file *file, void *p,
168  struct v4l2_ext_controls *vecs)
169 {
170  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
171  g_ext_ctrls, vecs);
172 }
173 
174 static int radio_si4713_s_ext_ctrls(struct file *file, void *p,
175  struct v4l2_ext_controls *vecs)
176 {
177  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
178  s_ext_ctrls, vecs);
179 }
180 
181 static int radio_si4713_g_ctrl(struct file *file, void *p,
182  struct v4l2_control *vc)
183 {
184  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
185  g_ctrl, vc);
186 }
187 
188 static int radio_si4713_s_ctrl(struct file *file, void *p,
189  struct v4l2_control *vc)
190 {
191  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
192  s_ctrl, vc);
193 }
194 
195 static int radio_si4713_g_modulator(struct file *file, void *p,
196  struct v4l2_modulator *vm)
197 {
198  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
199  g_modulator, vm);
200 }
201 
202 static int radio_si4713_s_modulator(struct file *file, void *p,
203  const struct v4l2_modulator *vm)
204 {
205  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
206  s_modulator, vm);
207 }
208 
209 static int radio_si4713_g_frequency(struct file *file, void *p,
210  struct v4l2_frequency *vf)
211 {
212  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
213  g_frequency, vf);
214 }
215 
216 static int radio_si4713_s_frequency(struct file *file, void *p,
217  struct v4l2_frequency *vf)
218 {
219  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
220  s_frequency, vf);
221 }
222 
223 static long radio_si4713_default(struct file *file, void *p,
224  bool valid_prio, int cmd, void *arg)
225 {
226  return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
227  ioctl, cmd, arg);
228 }
229 
230 static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
231  .vidioc_enumaudout = radio_si4713_enumaudout,
232  .vidioc_g_audout = radio_si4713_g_audout,
233  .vidioc_s_audout = radio_si4713_s_audout,
234  .vidioc_querycap = radio_si4713_querycap,
235  .vidioc_queryctrl = radio_si4713_queryctrl,
236  .vidioc_g_ext_ctrls = radio_si4713_g_ext_ctrls,
237  .vidioc_s_ext_ctrls = radio_si4713_s_ext_ctrls,
238  .vidioc_g_ctrl = radio_si4713_g_ctrl,
239  .vidioc_s_ctrl = radio_si4713_s_ctrl,
240  .vidioc_g_modulator = radio_si4713_g_modulator,
241  .vidioc_s_modulator = radio_si4713_s_modulator,
242  .vidioc_g_frequency = radio_si4713_g_frequency,
243  .vidioc_s_frequency = radio_si4713_s_frequency,
244  .vidioc_default = radio_si4713_default,
245 };
246 
247 /* radio_si4713_vdev_template - video device interface */
248 static struct video_device radio_si4713_vdev_template = {
249  .fops = &radio_si4713_fops,
250  .name = "radio-si4713",
251  .release = video_device_release,
252  .ioctl_ops = &radio_si4713_ioctl_ops,
253 };
254 
255 /* Platform driver interface */
256 /* radio_si4713_pdriver_probe - probe for the device */
257 static int radio_si4713_pdriver_probe(struct platform_device *pdev)
258 {
259  struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
260  struct radio_si4713_device *rsdev;
261  struct i2c_adapter *adapter;
262  struct v4l2_subdev *sd;
263  int rval = 0;
264 
265  if (!pdata) {
266  dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
267  rval = -EINVAL;
268  goto exit;
269  }
270 
271  rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
272  if (!rsdev) {
273  dev_err(&pdev->dev, "Failed to alloc video device.\n");
274  rval = -ENOMEM;
275  goto exit;
276  }
277 
278  rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
279  if (rval) {
280  dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
281  goto exit;
282  }
283 
284  adapter = i2c_get_adapter(pdata->i2c_bus);
285  if (!adapter) {
286  dev_err(&pdev->dev, "Cannot get i2c adapter %d\n",
287  pdata->i2c_bus);
288  rval = -ENODEV;
289  goto unregister_v4l2_dev;
290  }
291 
292  sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter,
293  pdata->subdev_board_info, NULL);
294  if (!sd) {
295  dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
296  rval = -ENODEV;
297  goto put_adapter;
298  }
299 
300  rsdev->radio_dev = video_device_alloc();
301  if (!rsdev->radio_dev) {
302  dev_err(&pdev->dev, "Failed to alloc video device.\n");
303  rval = -ENOMEM;
304  goto put_adapter;
305  }
306 
307  memcpy(rsdev->radio_dev, &radio_si4713_vdev_template,
308  sizeof(radio_si4713_vdev_template));
309  video_set_drvdata(rsdev->radio_dev, rsdev);
310  if (video_register_device(rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
311  dev_err(&pdev->dev, "Could not register video device.\n");
312  rval = -EIO;
313  goto free_vdev;
314  }
315  dev_info(&pdev->dev, "New device successfully probed\n");
316 
317  goto exit;
318 
319 free_vdev:
320  video_device_release(rsdev->radio_dev);
321 put_adapter:
322  i2c_put_adapter(adapter);
323 unregister_v4l2_dev:
324  v4l2_device_unregister(&rsdev->v4l2_dev);
325 exit:
326  return rval;
327 }
328 
329 /* radio_si4713_pdriver_remove - remove the device */
330 static int __exit radio_si4713_pdriver_remove(struct platform_device *pdev)
331 {
332  struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
333  struct radio_si4713_device *rsdev = container_of(v4l2_dev,
334  struct radio_si4713_device,
335  v4l2_dev);
336  struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
337  struct v4l2_subdev, list);
338  struct i2c_client *client = v4l2_get_subdevdata(sd);
339 
340  video_unregister_device(rsdev->radio_dev);
341  i2c_put_adapter(client->adapter);
342  v4l2_device_unregister(&rsdev->v4l2_dev);
343 
344  return 0;
345 }
346 
347 static struct platform_driver radio_si4713_pdriver = {
348  .driver = {
349  .name = "radio-si4713",
350  },
351  .probe = radio_si4713_pdriver_probe,
352  .remove = __exit_p(radio_si4713_pdriver_remove),
353 };
354 
355 module_platform_driver(radio_si4713_pdriver);
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