214 lines
6.2 KiB
C
214 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* drivers/media/radio/radio-si4713.c
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*
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* Platform Driver for Silicon Labs Si4713 FM Radio Transmitter:
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*
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* Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT
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* Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <linux/slab.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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#include "si4713.h"
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/* module parameters */
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static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */
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module_param(radio_nr, int, 0);
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MODULE_PARM_DESC(radio_nr,
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"Minor number for radio device (-1 ==> auto assign)");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
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MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
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MODULE_VERSION("0.0.1");
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MODULE_ALIAS("platform:radio-si4713");
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/* Driver state struct */
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struct radio_si4713_device {
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struct v4l2_device v4l2_dev;
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struct video_device radio_dev;
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struct mutex lock;
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};
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/* radio_si4713_fops - file operations interface */
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static const struct v4l2_file_operations radio_si4713_fops = {
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.owner = THIS_MODULE,
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.open = v4l2_fh_open,
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.release = v4l2_fh_release,
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.poll = v4l2_ctrl_poll,
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/* Note: locking is done at the subdev level in the i2c driver. */
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.unlocked_ioctl = video_ioctl2,
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};
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/* Video4Linux Interface */
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/* radio_si4713_querycap - query device capabilities */
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static int radio_si4713_querycap(struct file *file, void *priv,
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struct v4l2_capability *capability)
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{
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strscpy(capability->driver, "radio-si4713", sizeof(capability->driver));
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strscpy(capability->card, "Silicon Labs Si4713 Modulator",
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sizeof(capability->card));
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strscpy(capability->bus_info, "platform:radio-si4713",
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sizeof(capability->bus_info));
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return 0;
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}
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/*
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* v4l2 ioctl call backs.
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* we are just a wrapper for v4l2_sub_devs.
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*/
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static inline struct v4l2_device *get_v4l2_dev(struct file *file)
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{
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return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
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}
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static int radio_si4713_g_modulator(struct file *file, void *p,
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struct v4l2_modulator *vm)
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{
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return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
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g_modulator, vm);
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}
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static int radio_si4713_s_modulator(struct file *file, void *p,
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const struct v4l2_modulator *vm)
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{
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return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
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s_modulator, vm);
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}
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static int radio_si4713_g_frequency(struct file *file, void *p,
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struct v4l2_frequency *vf)
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{
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return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
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g_frequency, vf);
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}
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static int radio_si4713_s_frequency(struct file *file, void *p,
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const struct v4l2_frequency *vf)
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{
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return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
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s_frequency, vf);
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}
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static long radio_si4713_default(struct file *file, void *p,
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bool valid_prio, unsigned int cmd, void *arg)
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{
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return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
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ioctl, cmd, arg);
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}
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static const struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
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.vidioc_querycap = radio_si4713_querycap,
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.vidioc_g_modulator = radio_si4713_g_modulator,
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.vidioc_s_modulator = radio_si4713_s_modulator,
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.vidioc_g_frequency = radio_si4713_g_frequency,
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.vidioc_s_frequency = radio_si4713_s_frequency,
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.vidioc_log_status = v4l2_ctrl_log_status,
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
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.vidioc_default = radio_si4713_default,
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};
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/* radio_si4713_vdev_template - video device interface */
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static const struct video_device radio_si4713_vdev_template = {
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.fops = &radio_si4713_fops,
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.name = "radio-si4713",
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.release = video_device_release_empty,
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.ioctl_ops = &radio_si4713_ioctl_ops,
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.vfl_dir = VFL_DIR_TX,
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};
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/* Platform driver interface */
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/* radio_si4713_pdriver_probe - probe for the device */
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static int radio_si4713_pdriver_probe(struct platform_device *pdev)
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{
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struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
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struct radio_si4713_device *rsdev;
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struct v4l2_subdev *sd;
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int rval = 0;
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if (!pdata) {
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dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
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rval = -EINVAL;
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goto exit;
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}
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rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
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if (!rsdev) {
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dev_err(&pdev->dev, "Failed to alloc video device.\n");
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rval = -ENOMEM;
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goto exit;
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}
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mutex_init(&rsdev->lock);
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rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
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if (rval) {
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dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
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goto exit;
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}
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sd = i2c_get_clientdata(pdata->subdev);
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rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
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if (rval) {
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dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
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goto unregister_v4l2_dev;
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}
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rsdev->radio_dev = radio_si4713_vdev_template;
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rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
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rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
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/* Serialize all access to the si4713 */
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rsdev->radio_dev.lock = &rsdev->lock;
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rsdev->radio_dev.device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
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video_set_drvdata(&rsdev->radio_dev, rsdev);
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if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
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dev_err(&pdev->dev, "Could not register video device.\n");
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rval = -EIO;
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goto unregister_v4l2_dev;
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}
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dev_info(&pdev->dev, "New device successfully probed\n");
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goto exit;
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unregister_v4l2_dev:
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v4l2_device_unregister(&rsdev->v4l2_dev);
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exit:
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return rval;
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}
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/* radio_si4713_pdriver_remove - remove the device */
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static int radio_si4713_pdriver_remove(struct platform_device *pdev)
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{
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struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
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struct radio_si4713_device *rsdev;
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rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
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video_unregister_device(&rsdev->radio_dev);
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v4l2_device_unregister(&rsdev->v4l2_dev);
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return 0;
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}
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static struct platform_driver radio_si4713_pdriver = {
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.driver = {
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.name = "radio-si4713",
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},
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.probe = radio_si4713_pdriver_probe,
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.remove = radio_si4713_pdriver_remove,
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};
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module_platform_driver(radio_si4713_pdriver);
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