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 <media/radio-si4713.h>
38
39 /* module parameters */
40 static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */
41 module_param(radio_nr, int, 0);
42 MODULE_PARM_DESC(radio_nr,
43 "Minor number for radio device (-1 ==> auto assign)");
44
45 MODULE_LICENSE("GPL v2");
46 MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
47 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
48 MODULE_VERSION("0.0.1");
49 MODULE_ALIAS("platform:radio-si4713");
50
51 /* Driver state struct */
52 struct 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 */
59 static 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 */
radio_si4713_querycap(struct file * file,void * priv,struct v4l2_capability * capability)71 static 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 */
get_v4l2_dev(struct file * file)89 static inline struct v4l2_device *get_v4l2_dev(struct file *file)
90 {
91 return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
92 }
93
radio_si4713_g_modulator(struct file * file,void * p,struct v4l2_modulator * vm)94 static 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
radio_si4713_s_modulator(struct file * file,void * p,const struct v4l2_modulator * vm)101 static 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
radio_si4713_g_frequency(struct file * file,void * p,struct v4l2_frequency * vf)108 static 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
radio_si4713_s_frequency(struct file * file,void * p,const struct v4l2_frequency * vf)115 static 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
radio_si4713_default(struct file * file,void * p,bool valid_prio,unsigned int cmd,void * arg)122 static 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
129 static 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 */
142 static 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 */
radio_si4713_pdriver_probe(struct platform_device * pdev)152 static 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 i2c_adapter *adapter;
157 struct v4l2_subdev *sd;
158 int rval = 0;
159
160 if (!pdata) {
161 dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
162 rval = -EINVAL;
163 goto exit;
164 }
165
166 rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
167 if (!rsdev) {
168 dev_err(&pdev->dev, "Failed to alloc video device.\n");
169 rval = -ENOMEM;
170 goto exit;
171 }
172 mutex_init(&rsdev->lock);
173
174 rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
175 if (rval) {
176 dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
177 goto exit;
178 }
179
180 adapter = i2c_get_adapter(pdata->i2c_bus);
181 if (!adapter) {
182 dev_err(&pdev->dev, "Cannot get i2c adapter %d\n",
183 pdata->i2c_bus);
184 rval = -ENODEV;
185 goto unregister_v4l2_dev;
186 }
187
188 sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter,
189 pdata->subdev_board_info, NULL);
190 if (!sd) {
191 dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
192 rval = -ENODEV;
193 goto put_adapter;
194 }
195
196 rsdev->radio_dev = radio_si4713_vdev_template;
197 rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
198 rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
199 /* Serialize all access to the si4713 */
200 rsdev->radio_dev.lock = &rsdev->lock;
201 video_set_drvdata(&rsdev->radio_dev, rsdev);
202 if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
203 dev_err(&pdev->dev, "Could not register video device.\n");
204 rval = -EIO;
205 goto put_adapter;
206 }
207 dev_info(&pdev->dev, "New device successfully probed\n");
208
209 goto exit;
210
211 put_adapter:
212 i2c_put_adapter(adapter);
213 unregister_v4l2_dev:
214 v4l2_device_unregister(&rsdev->v4l2_dev);
215 exit:
216 return rval;
217 }
218
219 /* radio_si4713_pdriver_remove - remove the device */
radio_si4713_pdriver_remove(struct platform_device * pdev)220 static int radio_si4713_pdriver_remove(struct platform_device *pdev)
221 {
222 struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
223 struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
224 struct v4l2_subdev, list);
225 struct i2c_client *client = v4l2_get_subdevdata(sd);
226 struct radio_si4713_device *rsdev;
227
228 rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
229 video_unregister_device(&rsdev->radio_dev);
230 i2c_put_adapter(client->adapter);
231 v4l2_device_unregister(&rsdev->v4l2_dev);
232
233 return 0;
234 }
235
236 static struct platform_driver radio_si4713_pdriver = {
237 .driver = {
238 .name = "radio-si4713",
239 .owner = THIS_MODULE,
240 },
241 .probe = radio_si4713_pdriver_probe,
242 .remove = radio_si4713_pdriver_remove,
243 };
244
245 module_platform_driver(radio_si4713_pdriver);
246