aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-si4713.c
blob: 1507c9d508d7c59e98ea0f58cbc017726b3329c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
/*
 * drivers/media/radio/radio-si4713.c
 *
 * Platform Driver for Silicon Labs Si4713 FM Radio Transmitter:
 *
 * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT
 * Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/radio-si4713.h>

/* module parameters */
static int radio_nr = -1;	/* radio device minor (-1 ==> auto assign) */
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr,
		 "Minor number for radio device (-1 ==> auto assign)");

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
MODULE_VERSION("0.0.1");

/* Driver state struct */
struct radio_si4713_device {
	struct v4l2_device		v4l2_dev;
	struct video_device		*radio_dev;
};

/* radio_si4713_fops - file operations interface */
static const struct v4l2_file_operations radio_si4713_fops = {
	.owner		= THIS_MODULE,
	/* Note: locking is done at the subdev level in the i2c driver. */
	.unlocked_ioctl	= video_ioctl2,
};

/* Video4Linux Interface */
static int radio_si4713_fill_audout(struct v4l2_audioout *vao)
{
	/* TODO: check presence of audio output */
	strlcpy(vao->name, "FM Modulator Audio Out", 32);

	return 0;
}

static int radio_si4713_enumaudout(struct file *file, void *priv,
						struct v4l2_audioout *vao)
{
	return radio_si4713_fill_audout(vao);
}

static int radio_si4713_g_audout(struct file *file, void *priv,
					struct v4l2_audioout *vao)
{
	int rval = radio_si4713_fill_audout(vao);

	vao->index = 0;

	return rval;
}

static int radio_si4713_s_audout(struct file *file, void *priv,
					const struct v4l2_audioout *vao)
{
	return vao->index ? -EINVAL : 0;
}

/* radio_si4713_querycap - query device capabilities */
static int radio_si4713_querycap(struct file *file, void *priv,
					struct v4l2_capability *capability)
{
	strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
	strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
				sizeof(capability->card));
	capability->capabilities = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;

	return 0;
}

/* radio_si4713_queryctrl - enumerate control items */
static int radio_si4713_queryctrl(struct file *file, void *priv,
						struct v4l2_queryctrl *qc)
{
	/* Must be sorted from low to high control ID! */
	static const u32 user_ctrls[] = {
		V4L2_CID_USER_CLASS,
		V4L2_CID_AUDIO_MUTE,
		0
	};

	/* Must be sorted from low to high control ID! */
	static const u32 fmtx_ctrls[] = {
		V4L2_CID_FM_TX_CLASS,
		V4L2_CID_RDS_TX_DEVIATION,
		V4L2_CID_RDS_TX_PI,
		V4L2_CID_RDS_TX_PTY,
		V4L2_CID_RDS_TX_PS_NAME,
		V4L2_CID_RDS_TX_RADIO_TEXT,
		V4L2_CID_AUDIO_LIMITER_ENABLED,
		V4L2_CID_AUDIO_LIMITER_RELEASE_TIME,
		V4L2_CID_AUDIO_LIMITER_DEVIATION,
		V4L2_CID_AUDIO_COMPRESSION_ENABLED,
		V4L2_CID_AUDIO_COMPRESSION_GAIN,
		V4L2_CID_AUDIO_COMPRESSION_THRESHOLD,
		V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME,
		V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME,
		V4L2_CID_PILOT_TONE_ENABLED,
		V4L2_CID_PILOT_TONE_DEVIATION,
		V4L2_CID_PILOT_TONE_FREQUENCY,
		V4L2_CID_TUNE_PREEMPHASIS,
		V4L2_CID_TUNE_POWER_LEVEL,
		V4L2_CID_TUNE_ANTENNA_CAPACITOR,
		0
	};
	static const u32 *ctrl_classes[] = {
		user_ctrls,
		fmtx_ctrls,
		NULL
	};
	struct radio_si4713_device *rsdev;

	rsdev = video_get_drvdata(video_devdata(file));

	qc->id = v4l2_ctrl_next(ctrl_classes, qc->id);
	if (qc->id == 0)
		return -EINVAL;

	if (qc->id == V4L2_CID_USER_CLASS || qc->id == V4L2_CID_FM_TX_CLASS)
		return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0);

	return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core,
						queryctrl, qc);
}

/*
 * v4l2 ioctl call backs.
 * we are just a wrapper for v4l2_sub_devs.
 */
static inline struct v4l2_device *get_v4l2_dev(struct file *file)
{
	return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
}

static int radio_si4713_g_ext_ctrls(struct file *file, void *p,
						struct v4l2_ext_controls *vecs)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
							g_ext_ctrls, vecs);
}

static int radio_si4713_s_ext_ctrls(struct file *file, void *p,
						struct v4l2_ext_controls *vecs)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
							s_ext_ctrls, vecs);
}

static int radio_si4713_g_ctrl(struct file *file, void *p,
						struct v4l2_control *vc)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
							g_ctrl, vc);
}

static int radio_si4713_s_ctrl(struct file *file, void *p,
						struct v4l2_control *vc)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
							s_ctrl, vc);
}

static int radio_si4713_g_modulator(struct file *file, void *p,
						struct v4l2_modulator *vm)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
							g_modulator, vm);
}

static int radio_si4713_s_modulator(struct file *file, void *p,
						const struct v4l2_modulator *vm)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
							s_modulator, vm);
}

static int radio_si4713_g_frequency(struct file *file, void *p,
						struct v4l2_frequency *vf)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
							g_frequency, vf);
}

static int radio_si4713_s_frequency(struct file *file, void *p,
						struct v4l2_frequency *vf)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
							s_frequency, vf);
}

static long radio_si4713_default(struct file *file, void *p,
				bool valid_prio, int cmd, void *arg)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
							ioctl, cmd, arg);
}

static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
	.vidioc_enumaudout	= radio_si4713_enumaudout,
	.vidioc_g_audout	= radio_si4713_g_audout,
	.vidioc_s_audout	= radio_si4713_s_audout,
	.vidioc_querycap	= radio_si4713_querycap,
	.vidioc_queryctrl	= radio_si4713_queryctrl,
	.vidioc_g_ext_ctrls	= radio_si4713_g_ext_ctrls,
	.vidioc_s_ext_ctrls	= radio_si4713_s_ext_ctrls,
	.vidioc_g_ctrl		= radio_si4713_g_ctrl,
	.vidioc_s_ctrl		= radio_si4713_s_ctrl,
	.vidioc_g_modulator	= radio_si4713_g_modulator,
	.vidioc_s_modulator	= radio_si4713_s_modulator,
	.vidioc_g_frequency	= radio_si4713_g_frequency,
	.vidioc_s_frequency	= radio_si4713_s_frequency,
	.vidioc_default		= radio_si4713_default,
};

/* radio_si4713_vdev_template - video device interface */
static struct video_device radio_si4713_vdev_template = {
	.fops			= &radio_si4713_fops,
	.name			= "radio-si4713",
	.release		= video_device_release,
	.ioctl_ops		= &radio_si4713_ioctl_ops,
	.vfl_dir		= VFL_DIR_TX,
};

/* Platform driver interface */
/* radio_si4713_pdriver_probe - probe for the device */
static int radio_si4713_pdriver_probe(struct platform_device *pdev)
{
	struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
	struct radio_si4713_device *rsdev;
	struct i2c_adapter *adapter;
	struct v4l2_subdev *sd;
	int rval = 0;

	if (!pdata) {
		dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
		rval = -EINVAL;
		goto exit;
	}

	rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
	if (!rsdev) {
		dev_err(&pdev->dev, "Failed to alloc video device.\n");
		rval = -ENOMEM;
		goto exit;
	}

	rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
	if (rval) {
		dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
		goto exit;
	}

	adapter = i2c_get_adapter(pdata->i2c_bus);
	if (!adapter) {
		dev_err(&pdev->dev, "Cannot get i2c adapter %d\n",
							pdata->i2c_bus);
		rval = -ENODEV;
		goto unregister_v4l2_dev;
	}

	sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter,
					pdata->subdev_board_info, NULL);
	if (!sd) {
		dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
		rval = -ENODEV;
		goto put_adapter;
	}

	rsdev->radio_dev = video_device_alloc();
	if (!rsdev->radio_dev) {
		dev_err(&pdev->dev, "Failed to alloc video device.\n");
		rval = -ENOMEM;
		goto put_adapter;
	}

	memcpy(rsdev->radio_dev, &radio_si4713_vdev_template,
			sizeof(radio_si4713_vdev_template));
	video_set_drvdata(rsdev->radio_dev, rsdev);
	if (video_register_device(rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
		dev_err(&pdev->dev, "Could not register video device.\n");
		rval = -EIO;
		goto free_vdev;
	}
	dev_info(&pdev->dev, "New device successfully probed\n");

	goto exit;

free_vdev:
	video_device_release(rsdev->radio_dev);
put_adapter:
	i2c_put_adapter(adapter);
unregister_v4l2_dev:
	v4l2_device_unregister(&rsdev->v4l2_dev);
exit:
	return rval;
}

/* radio_si4713_pdriver_remove - remove the device */
static int __exit radio_si4713_pdriver_remove(struct platform_device *pdev)
{
	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
	struct radio_si4713_device *rsdev = container_of(v4l2_dev,
						struct radio_si4713_device,
						v4l2_dev);
	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
					    struct v4l2_subdev, list);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	video_unregister_device(rsdev->radio_dev);
	i2c_put_adapter(client->adapter);
	v4l2_device_unregister(&rsdev->v4l2_dev);

	return 0;
}

static struct platform_driver radio_si4713_pdriver = {
	.driver		= {
		.name	= "radio-si4713",
	},
	.probe		= radio_si4713_pdriver_probe,
	.remove         = __exit_p(radio_si4713_pdriver_remove),
};

module_platform_driver(radio_si4713_pdriver);