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Linux/drivers/media/radio/si4713/radio-platform-si4713.c

  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 */
 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  */
 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 
 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 
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 
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 
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 
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 */
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         set_bit(V4L2_FL_USE_FH_PRIO, &rsdev->radio_dev.flags);
200         /* Serialize all access to the si4713 */
201         rsdev->radio_dev.lock = &rsdev->lock;
202         video_set_drvdata(&rsdev->radio_dev, rsdev);
203         if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
204                 dev_err(&pdev->dev, "Could not register video device.\n");
205                 rval = -EIO;
206                 goto put_adapter;
207         }
208         dev_info(&pdev->dev, "New device successfully probed\n");
209 
210         goto exit;
211 
212 put_adapter:
213         i2c_put_adapter(adapter);
214 unregister_v4l2_dev:
215         v4l2_device_unregister(&rsdev->v4l2_dev);
216 exit:
217         return rval;
218 }
219 
220 /* radio_si4713_pdriver_remove - remove the device */
221 static int radio_si4713_pdriver_remove(struct platform_device *pdev)
222 {
223         struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
224         struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
225                                             struct v4l2_subdev, list);
226         struct i2c_client *client = v4l2_get_subdevdata(sd);
227         struct radio_si4713_device *rsdev;
228 
229         rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
230         video_unregister_device(&rsdev->radio_dev);
231         i2c_put_adapter(client->adapter);
232         v4l2_device_unregister(&rsdev->v4l2_dev);
233 
234         return 0;
235 }
236 
237 static struct platform_driver radio_si4713_pdriver = {
238         .driver         = {
239                 .name   = "radio-si4713",
240                 .owner  = THIS_MODULE,
241         },
242         .probe          = radio_si4713_pdriver_probe,
243         .remove         = radio_si4713_pdriver_remove,
244 };
245 
246 module_platform_driver(radio_si4713_pdriver);
247 

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