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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
40static int radio_nr = -1;
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
52struct radio_si4713_device {
53 struct v4l2_device v4l2_dev;
54 struct video_device radio_dev;
55 struct mutex lock;
56};
57
58
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
65 .unlocked_ioctl = video_ioctl2,
66};
67
68
69
70
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
87
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
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
151
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
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
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
