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
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/platform_device.h>
24 #include <linux/i2c.h>
25 #include <linux/videodev2.h>
26 #include <linux/slab.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-common.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-fh.h>
31 #include <media/v4l2-ctrls.h>
32 #include <media/v4l2-event.h>
33 #include "si4713.h"
34
35 /* module parameters */
36 static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */
37 module_param(radio_nr, int, 0);
38 MODULE_PARM_DESC(radio_nr,
39 "Minor number for radio device (-1 ==> auto assign)");
40
41 MODULE_LICENSE("GPL v2");
42 MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
43 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
44 MODULE_VERSION("0.0.1");
45 MODULE_ALIAS("platform:radio-si4713");
46
47 /* Driver state struct */
48 struct radio_si4713_device {
49 struct v4l2_device v4l2_dev;
50 struct video_device radio_dev;
51 struct mutex lock;
52 };
53
54 /* radio_si4713_fops - file operations interface */
55 static const struct v4l2_file_operations radio_si4713_fops = {
56 .owner = THIS_MODULE,
57 .open = v4l2_fh_open,
58 .release = v4l2_fh_release,
59 .poll = v4l2_ctrl_poll,
60 /* Note: locking is done at the subdev level in the i2c driver. */
61 .unlocked_ioctl = video_ioctl2,
62 };
63
64 /* Video4Linux Interface */
65
66 /* radio_si4713_querycap - query device capabilities */
radio_si4713_querycap(struct file * file,void * priv,struct v4l2_capability * capability)67 static int radio_si4713_querycap(struct file *file, void *priv,
68 struct v4l2_capability *capability)
69 {
70 strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
71 strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
72 sizeof(capability->card));
73 strlcpy(capability->bus_info, "platform:radio-si4713",
74 sizeof(capability->bus_info));
75 capability->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
76 capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
77
78 return 0;
79 }
80
81 /*
82 * v4l2 ioctl call backs.
83 * we are just a wrapper for v4l2_sub_devs.
84 */
get_v4l2_dev(struct file * file)85 static inline struct v4l2_device *get_v4l2_dev(struct file *file)
86 {
87 return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
88 }
89
radio_si4713_g_modulator(struct file * file,void * p,struct v4l2_modulator * vm)90 static int radio_si4713_g_modulator(struct file *file, void *p,
91 struct v4l2_modulator *vm)
92 {
93 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
94 g_modulator, vm);
95 }
96
radio_si4713_s_modulator(struct file * file,void * p,const struct v4l2_modulator * vm)97 static int radio_si4713_s_modulator(struct file *file, void *p,
98 const struct v4l2_modulator *vm)
99 {
100 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
101 s_modulator, vm);
102 }
103
radio_si4713_g_frequency(struct file * file,void * p,struct v4l2_frequency * vf)104 static int radio_si4713_g_frequency(struct file *file, void *p,
105 struct v4l2_frequency *vf)
106 {
107 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
108 g_frequency, vf);
109 }
110
radio_si4713_s_frequency(struct file * file,void * p,const struct v4l2_frequency * vf)111 static int radio_si4713_s_frequency(struct file *file, void *p,
112 const struct v4l2_frequency *vf)
113 {
114 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
115 s_frequency, vf);
116 }
117
radio_si4713_default(struct file * file,void * p,bool valid_prio,unsigned int cmd,void * arg)118 static long radio_si4713_default(struct file *file, void *p,
119 bool valid_prio, unsigned int cmd, void *arg)
120 {
121 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
122 ioctl, cmd, arg);
123 }
124
125 static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
126 .vidioc_querycap = radio_si4713_querycap,
127 .vidioc_g_modulator = radio_si4713_g_modulator,
128 .vidioc_s_modulator = radio_si4713_s_modulator,
129 .vidioc_g_frequency = radio_si4713_g_frequency,
130 .vidioc_s_frequency = radio_si4713_s_frequency,
131 .vidioc_log_status = v4l2_ctrl_log_status,
132 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
133 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
134 .vidioc_default = radio_si4713_default,
135 };
136
137 /* radio_si4713_vdev_template - video device interface */
138 static const struct video_device radio_si4713_vdev_template = {
139 .fops = &radio_si4713_fops,
140 .name = "radio-si4713",
141 .release = video_device_release_empty,
142 .ioctl_ops = &radio_si4713_ioctl_ops,
143 .vfl_dir = VFL_DIR_TX,
144 };
145
146 /* Platform driver interface */
147 /* radio_si4713_pdriver_probe - probe for the device */
radio_si4713_pdriver_probe(struct platform_device * pdev)148 static int radio_si4713_pdriver_probe(struct platform_device *pdev)
149 {
150 struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
151 struct radio_si4713_device *rsdev;
152 struct v4l2_subdev *sd;
153 int rval = 0;
154
155 if (!pdata) {
156 dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
157 rval = -EINVAL;
158 goto exit;
159 }
160
161 rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
162 if (!rsdev) {
163 dev_err(&pdev->dev, "Failed to alloc video device.\n");
164 rval = -ENOMEM;
165 goto exit;
166 }
167 mutex_init(&rsdev->lock);
168
169 rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
170 if (rval) {
171 dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
172 goto exit;
173 }
174
175 sd = i2c_get_clientdata(pdata->subdev);
176 rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
177 if (rval) {
178 dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
179 goto unregister_v4l2_dev;
180 }
181
182 rsdev->radio_dev = radio_si4713_vdev_template;
183 rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
184 rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
185 /* Serialize all access to the si4713 */
186 rsdev->radio_dev.lock = &rsdev->lock;
187 video_set_drvdata(&rsdev->radio_dev, rsdev);
188 if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
189 dev_err(&pdev->dev, "Could not register video device.\n");
190 rval = -EIO;
191 goto unregister_v4l2_dev;
192 }
193 dev_info(&pdev->dev, "New device successfully probed\n");
194
195 goto exit;
196
197 unregister_v4l2_dev:
198 v4l2_device_unregister(&rsdev->v4l2_dev);
199 exit:
200 return rval;
201 }
202
203 /* radio_si4713_pdriver_remove - remove the device */
radio_si4713_pdriver_remove(struct platform_device * pdev)204 static int radio_si4713_pdriver_remove(struct platform_device *pdev)
205 {
206 struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
207 struct radio_si4713_device *rsdev;
208
209 rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
210 video_unregister_device(&rsdev->radio_dev);
211 v4l2_device_unregister(&rsdev->v4l2_dev);
212
213 return 0;
214 }
215
216 static struct platform_driver radio_si4713_pdriver = {
217 .driver = {
218 .name = "radio-si4713",
219 },
220 .probe = radio_si4713_pdriver_probe,
221 .remove = radio_si4713_pdriver_remove,
222 };
223
224 module_platform_driver(radio_si4713_pdriver);
225
