summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/si4713/radio-platform-si4713.c
blob: 433f9642786dd97a3d084a954b7ff426533b6506 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 */

#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/v4l2-fh.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include "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 v2");
MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
MODULE_VERSION("0.0.1");
MODULE_ALIAS("platform:radio-si4713");

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

/* radio_si4713_fops - file operations interface */
static const struct v4l2_file_operations radio_si4713_fops = {
	.owner		= THIS_MODULE,
	.open = v4l2_fh_open,
	.release = v4l2_fh_release,
	.poll = v4l2_ctrl_poll,
	/* Note: locking is done at the subdev level in the i2c driver. */
	.unlocked_ioctl	= video_ioctl2,
};

/* Video4Linux Interface */

/* radio_si4713_querycap - query device capabilities */
static int radio_si4713_querycap(struct file *file, void *priv,
					struct v4l2_capability *capability)
{
	strscpy(capability->driver, "radio-si4713", sizeof(capability->driver));
	strscpy(capability->card, "Silicon Labs Si4713 Modulator",
		sizeof(capability->card));
	strscpy(capability->bus_info, "platform:radio-si4713",
		sizeof(capability->bus_info));
	return 0;
}

/*
 * 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_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,
				    const 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, unsigned int cmd, void *arg)
{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
					  ioctl, cmd, arg);
}

static const struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
	.vidioc_querycap	= radio_si4713_querycap,
	.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_log_status      = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
	.vidioc_default		= radio_si4713_default,
};

/* radio_si4713_vdev_template - video device interface */
static const struct video_device radio_si4713_vdev_template = {
	.fops			= &radio_si4713_fops,
	.name			= "radio-si4713",
	.release		= video_device_release_empty,
	.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 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;
	}
	mutex_init(&rsdev->lock);

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

	sd = i2c_get_clientdata(pdata->subdev);
	rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
	if (rval) {
		dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
		goto unregister_v4l2_dev;
	}

	rsdev->radio_dev = radio_si4713_vdev_template;
	rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
	rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
	/* Serialize all access to the si4713 */
	rsdev->radio_dev.lock = &rsdev->lock;
	rsdev->radio_dev.device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
	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 unregister_v4l2_dev;
	}
	dev_info(&pdev->dev, "New device successfully probed\n");

	goto exit;

unregister_v4l2_dev:
	v4l2_device_unregister(&rsdev->v4l2_dev);
exit:
	return rval;
}

/* radio_si4713_pdriver_remove - remove the device */
static int radio_si4713_pdriver_remove(struct platform_device *pdev)
{
	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
	struct radio_si4713_device *rsdev;

	rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
	video_unregister_device(&rsdev->radio_dev);
	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         = radio_si4713_pdriver_remove,
};

module_platform_driver(radio_si4713_pdriver);