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 <linux/slab.h>
31#include <media/v4l2-device.h>
32#include <media/v4l2-common.h>
33#include <media/v4l2-ioctl.h>
34#include <media/v4l2-fh.h>
35#include <media/v4l2-ctrls.h>
36#include <media/v4l2-event.h>
37#include "si4713.h"
38
39/* module parameters */
40static int radio_nr = -1;	/* radio device minor (-1 ==> auto assign) */
41module_param(radio_nr, int, 0);
42MODULE_PARM_DESC(radio_nr,
43		 "Minor number for radio device (-1 ==> auto assign)");
44
45MODULE_LICENSE("GPL v2");
46MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
47MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
48MODULE_VERSION("0.0.1");
49MODULE_ALIAS("platform:radio-si4713");
50
51/* Driver state struct */
52struct radio_si4713_device {
53	struct v4l2_device		v4l2_dev;
54	struct video_device		radio_dev;
55	struct mutex lock;
56};
57
58/* radio_si4713_fops - file operations interface */
59static const struct v4l2_file_operations radio_si4713_fops = {
60	.owner		= THIS_MODULE,
61	.open = v4l2_fh_open,
62	.release = v4l2_fh_release,
63	.poll = v4l2_ctrl_poll,
64	/* Note: locking is done at the subdev level in the i2c driver. */
65	.unlocked_ioctl	= video_ioctl2,
66};
67
68/* Video4Linux Interface */
69
70/* radio_si4713_querycap - query device capabilities */
71static int radio_si4713_querycap(struct file *file, void *priv,
72					struct v4l2_capability *capability)
73{
74	strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
75	strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
76		sizeof(capability->card));
77	strlcpy(capability->bus_info, "platform:radio-si4713",
78		sizeof(capability->bus_info));
79	capability->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
80	capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
81
82	return 0;
83}
84
85/*
86 * v4l2 ioctl call backs.
87 * we are just a wrapper for v4l2_sub_devs.
88 */
89static inline struct v4l2_device *get_v4l2_dev(struct file *file)
90{
91	return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
92}
93
94static int radio_si4713_g_modulator(struct file *file, void *p,
95				    struct v4l2_modulator *vm)
96{
97	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
98					  g_modulator, vm);
99}
100
101static int radio_si4713_s_modulator(struct file *file, void *p,
102				    const struct v4l2_modulator *vm)
103{
104	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
105					  s_modulator, vm);
106}
107
108static int radio_si4713_g_frequency(struct file *file, void *p,
109				    struct v4l2_frequency *vf)
110{
111	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
112					  g_frequency, vf);
113}
114
115static int radio_si4713_s_frequency(struct file *file, void *p,
116				    const struct v4l2_frequency *vf)
117{
118	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
119					  s_frequency, vf);
120}
121
122static long radio_si4713_default(struct file *file, void *p,
123				 bool valid_prio, unsigned int cmd, void *arg)
124{
125	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
126					  ioctl, cmd, arg);
127}
128
129static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
130	.vidioc_querycap	= radio_si4713_querycap,
131	.vidioc_g_modulator	= radio_si4713_g_modulator,
132	.vidioc_s_modulator	= radio_si4713_s_modulator,
133	.vidioc_g_frequency	= radio_si4713_g_frequency,
134	.vidioc_s_frequency	= radio_si4713_s_frequency,
135	.vidioc_log_status      = v4l2_ctrl_log_status,
136	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
137	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
138	.vidioc_default		= radio_si4713_default,
139};
140
141/* radio_si4713_vdev_template - video device interface */
142static struct video_device radio_si4713_vdev_template = {
143	.fops			= &radio_si4713_fops,
144	.name			= "radio-si4713",
145	.release		= video_device_release_empty,
146	.ioctl_ops		= &radio_si4713_ioctl_ops,
147	.vfl_dir		= VFL_DIR_TX,
148};
149
150/* Platform driver interface */
151/* radio_si4713_pdriver_probe - probe for the device */
152static int radio_si4713_pdriver_probe(struct platform_device *pdev)
153{
154	struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
155	struct radio_si4713_device *rsdev;
156	struct v4l2_subdev *sd;
157	int rval = 0;
158
159	if (!pdata) {
160		dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
161		rval = -EINVAL;
162		goto exit;
163	}
164
165	rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
166	if (!rsdev) {
167		dev_err(&pdev->dev, "Failed to alloc video device.\n");
168		rval = -ENOMEM;
169		goto exit;
170	}
171	mutex_init(&rsdev->lock);
172
173	rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
174	if (rval) {
175		dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
176		goto exit;
177	}
178
179	sd = i2c_get_clientdata(pdata->subdev);
180	rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
181	if (rval) {
182		dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
183		goto unregister_v4l2_dev;
184	}
185
186	rsdev->radio_dev = radio_si4713_vdev_template;
187	rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
188	rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
189	/* Serialize all access to the si4713 */
190	rsdev->radio_dev.lock = &rsdev->lock;
191	video_set_drvdata(&rsdev->radio_dev, rsdev);
192	if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
193		dev_err(&pdev->dev, "Could not register video device.\n");
194		rval = -EIO;
195		goto unregister_v4l2_dev;
196	}
197	dev_info(&pdev->dev, "New device successfully probed\n");
198
199	goto exit;
200
201unregister_v4l2_dev:
202	v4l2_device_unregister(&rsdev->v4l2_dev);
203exit:
204	return rval;
205}
206
207/* radio_si4713_pdriver_remove - remove the device */
208static int radio_si4713_pdriver_remove(struct platform_device *pdev)
209{
210	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
211	struct radio_si4713_device *rsdev;
212
213	rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
214	video_unregister_device(&rsdev->radio_dev);
215	v4l2_device_unregister(&rsdev->v4l2_dev);
216
217	return 0;
218}
219
220static struct platform_driver radio_si4713_pdriver = {
221	.driver		= {
222		.name	= "radio-si4713",
223	},
224	.probe		= radio_si4713_pdriver_probe,
225	.remove         = radio_si4713_pdriver_remove,
226};
227
228module_platform_driver(radio_si4713_pdriver);
229