summaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-isa.c
blob: ad49151f5ff0943b8c890c4f5327360d042121a2 (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
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Framework for ISA radio drivers.
 * This takes care of all the V4L2 scaffolding, allowing the ISA drivers
 * to concentrate on the actual hardware operation.
 *
 * Copyright (C) 2012 Hans Verkuil <hans.verkuil@cisco.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>

#include "radio-isa.h"

MODULE_AUTHOR("Hans Verkuil");
MODULE_DESCRIPTION("A framework for ISA radio drivers.");
MODULE_LICENSE("GPL");

#define FREQ_LOW  (87U * 16000U)
#define FREQ_HIGH (108U * 16000U)

static int radio_isa_querycap(struct file *file, void  *priv,
					struct v4l2_capability *v)
{
	struct radio_isa_card *isa = video_drvdata(file);

	strscpy(v->driver, isa->drv->driver.driver.name, sizeof(v->driver));
	strscpy(v->card, isa->drv->card, sizeof(v->card));
	snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev_name(isa->v4l2_dev.dev));
	return 0;
}

static int radio_isa_g_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct radio_isa_card *isa = video_drvdata(file);
	const struct radio_isa_ops *ops = isa->drv->ops;

	if (v->index > 0)
		return -EINVAL;

	strscpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = FREQ_LOW;
	v->rangehigh = FREQ_HIGH;
	v->capability = V4L2_TUNER_CAP_LOW;
	if (isa->drv->has_stereo)
		v->capability |= V4L2_TUNER_CAP_STEREO;

	if (ops->g_rxsubchans)
		v->rxsubchans = ops->g_rxsubchans(isa);
	else
		v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
	v->audmode = isa->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
	if (ops->g_signal)
		v->signal = ops->g_signal(isa);
	else
		v->signal = (v->rxsubchans & V4L2_TUNER_SUB_STEREO) ?
								0xffff : 0;
	return 0;
}

static int radio_isa_s_tuner(struct file *file, void *priv,
				const struct v4l2_tuner *v)
{
	struct radio_isa_card *isa = video_drvdata(file);
	const struct radio_isa_ops *ops = isa->drv->ops;

	if (v->index)
		return -EINVAL;
	if (ops->s_stereo) {
		isa->stereo = (v->audmode == V4L2_TUNER_MODE_STEREO);
		return ops->s_stereo(isa, isa->stereo);
	}
	return 0;
}

static int radio_isa_s_frequency(struct file *file, void *priv,
				const struct v4l2_frequency *f)
{
	struct radio_isa_card *isa = video_drvdata(file);
	u32 freq = f->frequency;
	int res;

	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
		return -EINVAL;
	freq = clamp(freq, FREQ_LOW, FREQ_HIGH);
	res = isa->drv->ops->s_frequency(isa, freq);
	if (res == 0)
		isa->freq = freq;
	return res;
}

static int radio_isa_g_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct radio_isa_card *isa = video_drvdata(file);

	if (f->tuner != 0)
		return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = isa->freq;
	return 0;
}

static int radio_isa_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct radio_isa_card *isa =
		container_of(ctrl->handler, struct radio_isa_card, hdl);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		return isa->drv->ops->s_mute_volume(isa, ctrl->val,
				isa->volume ? isa->volume->val : 0);
	}
	return -EINVAL;
}

static int radio_isa_log_status(struct file *file, void *priv)
{
	struct radio_isa_card *isa = video_drvdata(file);

	v4l2_info(&isa->v4l2_dev, "I/O Port = 0x%03x\n", isa->io);
	v4l2_ctrl_handler_log_status(&isa->hdl, isa->v4l2_dev.name);
	return 0;
}

static const struct v4l2_ctrl_ops radio_isa_ctrl_ops = {
	.s_ctrl = radio_isa_s_ctrl,
};

static const struct v4l2_file_operations radio_isa_fops = {
	.owner		= THIS_MODULE,
	.open		= v4l2_fh_open,
	.release	= v4l2_fh_release,
	.poll		= v4l2_ctrl_poll,
	.unlocked_ioctl	= video_ioctl2,
};

static const struct v4l2_ioctl_ops radio_isa_ioctl_ops = {
	.vidioc_querycap    = radio_isa_querycap,
	.vidioc_g_tuner     = radio_isa_g_tuner,
	.vidioc_s_tuner     = radio_isa_s_tuner,
	.vidioc_g_frequency = radio_isa_g_frequency,
	.vidioc_s_frequency = radio_isa_s_frequency,
	.vidioc_log_status  = radio_isa_log_status,
	.vidioc_subscribe_event   = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};

int radio_isa_match(struct device *pdev, unsigned int dev)
{
	struct radio_isa_driver *drv = pdev->platform_data;

	return drv->probe || drv->io_params[dev] >= 0;
}
EXPORT_SYMBOL_GPL(radio_isa_match);

static bool radio_isa_valid_io(const struct radio_isa_driver *drv, int io)
{
	int i;

	for (i = 0; i < drv->num_of_io_ports; i++)
		if (drv->io_ports[i] == io)
			return true;
	return false;
}

static struct radio_isa_card *radio_isa_alloc(struct radio_isa_driver *drv,
				struct device *pdev)
{
	struct v4l2_device *v4l2_dev;
	struct radio_isa_card *isa = drv->ops->alloc();
	if (!isa)
		return NULL;

	dev_set_drvdata(pdev, isa);
	isa->drv = drv;
	v4l2_dev = &isa->v4l2_dev;
	strscpy(v4l2_dev->name, dev_name(pdev), sizeof(v4l2_dev->name));

	return isa;
}

static int radio_isa_common_probe(struct radio_isa_card *isa,
				  struct device *pdev,
				  int radio_nr, unsigned region_size)
{
	const struct radio_isa_driver *drv = isa->drv;
	const struct radio_isa_ops *ops = drv->ops;
	struct v4l2_device *v4l2_dev = &isa->v4l2_dev;
	int res;

	if (!request_region(isa->io, region_size, v4l2_dev->name)) {
		v4l2_err(v4l2_dev, "port 0x%x already in use\n", isa->io);
		kfree(isa);
		return -EBUSY;
	}

	res = v4l2_device_register(pdev, v4l2_dev);
	if (res < 0) {
		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
		goto err_dev_reg;
	}

	v4l2_ctrl_handler_init(&isa->hdl, 1);
	isa->mute = v4l2_ctrl_new_std(&isa->hdl, &radio_isa_ctrl_ops,
				V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
	if (drv->max_volume)
		isa->volume = v4l2_ctrl_new_std(&isa->hdl, &radio_isa_ctrl_ops,
			V4L2_CID_AUDIO_VOLUME, 0, drv->max_volume, 1,
			drv->max_volume);
	v4l2_dev->ctrl_handler = &isa->hdl;
	if (isa->hdl.error) {
		res = isa->hdl.error;
		v4l2_err(v4l2_dev, "Could not register controls\n");
		goto err_hdl;
	}
	if (drv->max_volume)
		v4l2_ctrl_cluster(2, &isa->mute);
	v4l2_dev->ctrl_handler = &isa->hdl;

	mutex_init(&isa->lock);
	isa->vdev.lock = &isa->lock;
	strscpy(isa->vdev.name, v4l2_dev->name, sizeof(isa->vdev.name));
	isa->vdev.v4l2_dev = v4l2_dev;
	isa->vdev.fops = &radio_isa_fops;
	isa->vdev.ioctl_ops = &radio_isa_ioctl_ops;
	isa->vdev.release = video_device_release_empty;
	isa->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
	video_set_drvdata(&isa->vdev, isa);
	isa->freq = FREQ_LOW;
	isa->stereo = drv->has_stereo;

	if (ops->init)
		res = ops->init(isa);
	if (!res)
		res = v4l2_ctrl_handler_setup(&isa->hdl);
	if (!res)
		res = ops->s_frequency(isa, isa->freq);
	if (!res && ops->s_stereo)
		res = ops->s_stereo(isa, isa->stereo);
	if (res < 0) {
		v4l2_err(v4l2_dev, "Could not setup card\n");
		goto err_hdl;
	}
	res = video_register_device(&isa->vdev, VFL_TYPE_RADIO, radio_nr);

	if (res < 0) {
		v4l2_err(v4l2_dev, "Could not register device node\n");
		goto err_hdl;
	}

	v4l2_info(v4l2_dev, "Initialized radio card %s on port 0x%03x\n",
			drv->card, isa->io);
	return 0;

err_hdl:
	v4l2_ctrl_handler_free(&isa->hdl);
err_dev_reg:
	release_region(isa->io, region_size);
	kfree(isa);
	return res;
}

static void radio_isa_common_remove(struct radio_isa_card *isa,
				    unsigned region_size)
{
	const struct radio_isa_ops *ops = isa->drv->ops;

	ops->s_mute_volume(isa, true, isa->volume ? isa->volume->cur.val : 0);
	video_unregister_device(&isa->vdev);
	v4l2_ctrl_handler_free(&isa->hdl);
	v4l2_device_unregister(&isa->v4l2_dev);
	release_region(isa->io, region_size);
	v4l2_info(&isa->v4l2_dev, "Removed radio card %s\n", isa->drv->card);
	kfree(isa);
}

int radio_isa_probe(struct device *pdev, unsigned int dev)
{
	struct radio_isa_driver *drv = pdev->platform_data;
	const struct radio_isa_ops *ops = drv->ops;
	struct v4l2_device *v4l2_dev;
	struct radio_isa_card *isa;

	isa = radio_isa_alloc(drv, pdev);
	if (!isa)
		return -ENOMEM;
	isa->io = drv->io_params[dev];
	v4l2_dev = &isa->v4l2_dev;

	if (drv->probe && ops->probe) {
		int i;

		for (i = 0; i < drv->num_of_io_ports; ++i) {
			int io = drv->io_ports[i];

			if (request_region(io, drv->region_size, v4l2_dev->name)) {
				bool found = ops->probe(isa, io);

				release_region(io, drv->region_size);
				if (found) {
					isa->io = io;
					break;
				}
			}
		}
	}

	if (!radio_isa_valid_io(drv, isa->io)) {
		int i;

		if (isa->io < 0)
			return -ENODEV;
		v4l2_err(v4l2_dev, "you must set an I/O address with io=0x%03x",
				drv->io_ports[0]);
		for (i = 1; i < drv->num_of_io_ports; i++)
			printk(KERN_CONT "/0x%03x", drv->io_ports[i]);
		printk(KERN_CONT ".\n");
		kfree(isa);
		return -EINVAL;
	}

	return radio_isa_common_probe(isa, pdev, drv->radio_nr_params[dev],
					drv->region_size);
}
EXPORT_SYMBOL_GPL(radio_isa_probe);

void radio_isa_remove(struct device *pdev, unsigned int dev)
{
	struct radio_isa_card *isa = dev_get_drvdata(pdev);

	radio_isa_common_remove(isa, isa->drv->region_size);
}
EXPORT_SYMBOL_GPL(radio_isa_remove);

#ifdef CONFIG_PNP
int radio_isa_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
	struct pnp_driver *pnp_drv = to_pnp_driver(dev->dev.driver);
	struct radio_isa_driver *drv = container_of(pnp_drv,
					struct radio_isa_driver, pnp_driver);
	struct radio_isa_card *isa;

	if (!pnp_port_valid(dev, 0))
		return -ENODEV;

	isa = radio_isa_alloc(drv, &dev->dev);
	if (!isa)
		return -ENOMEM;

	isa->io = pnp_port_start(dev, 0);

	return radio_isa_common_probe(isa, &dev->dev, drv->radio_nr_params[0],
					pnp_port_len(dev, 0));
}
EXPORT_SYMBOL_GPL(radio_isa_pnp_probe);

void radio_isa_pnp_remove(struct pnp_dev *dev)
{
	struct radio_isa_card *isa = dev_get_drvdata(&dev->dev);

	radio_isa_common_remove(isa, pnp_port_len(dev, 0));
}
EXPORT_SYMBOL_GPL(radio_isa_pnp_remove);
#endif