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