cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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radio-platform-si4713.c (6323B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * drivers/media/radio/radio-si4713.c
      4 *
      5 * Platform Driver for Silicon Labs Si4713 FM Radio Transmitter:
      6 *
      7 * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT
      8 * Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
      9 */
     10
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/init.h>
     14#include <linux/platform_device.h>
     15#include <linux/i2c.h>
     16#include <linux/videodev2.h>
     17#include <linux/slab.h>
     18#include <media/v4l2-device.h>
     19#include <media/v4l2-common.h>
     20#include <media/v4l2-ioctl.h>
     21#include <media/v4l2-fh.h>
     22#include <media/v4l2-ctrls.h>
     23#include <media/v4l2-event.h>
     24#include "si4713.h"
     25
     26/* module parameters */
     27static int radio_nr = -1;	/* radio device minor (-1 ==> auto assign) */
     28module_param(radio_nr, int, 0);
     29MODULE_PARM_DESC(radio_nr,
     30		 "Minor number for radio device (-1 ==> auto assign)");
     31
     32MODULE_LICENSE("GPL v2");
     33MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
     34MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
     35MODULE_VERSION("0.0.1");
     36MODULE_ALIAS("platform:radio-si4713");
     37
     38/* Driver state struct */
     39struct radio_si4713_device {
     40	struct v4l2_device		v4l2_dev;
     41	struct video_device		radio_dev;
     42	struct mutex lock;
     43};
     44
     45/* radio_si4713_fops - file operations interface */
     46static const struct v4l2_file_operations radio_si4713_fops = {
     47	.owner		= THIS_MODULE,
     48	.open = v4l2_fh_open,
     49	.release = v4l2_fh_release,
     50	.poll = v4l2_ctrl_poll,
     51	/* Note: locking is done at the subdev level in the i2c driver. */
     52	.unlocked_ioctl	= video_ioctl2,
     53};
     54
     55/* Video4Linux Interface */
     56
     57/* radio_si4713_querycap - query device capabilities */
     58static int radio_si4713_querycap(struct file *file, void *priv,
     59					struct v4l2_capability *capability)
     60{
     61	strscpy(capability->driver, "radio-si4713", sizeof(capability->driver));
     62	strscpy(capability->card, "Silicon Labs Si4713 Modulator",
     63		sizeof(capability->card));
     64	strscpy(capability->bus_info, "platform:radio-si4713",
     65		sizeof(capability->bus_info));
     66	return 0;
     67}
     68
     69/*
     70 * v4l2 ioctl call backs.
     71 * we are just a wrapper for v4l2_sub_devs.
     72 */
     73static inline struct v4l2_device *get_v4l2_dev(struct file *file)
     74{
     75	return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
     76}
     77
     78static int radio_si4713_g_modulator(struct file *file, void *p,
     79				    struct v4l2_modulator *vm)
     80{
     81	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
     82					  g_modulator, vm);
     83}
     84
     85static int radio_si4713_s_modulator(struct file *file, void *p,
     86				    const struct v4l2_modulator *vm)
     87{
     88	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
     89					  s_modulator, vm);
     90}
     91
     92static int radio_si4713_g_frequency(struct file *file, void *p,
     93				    struct v4l2_frequency *vf)
     94{
     95	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
     96					  g_frequency, vf);
     97}
     98
     99static int radio_si4713_s_frequency(struct file *file, void *p,
    100				    const struct v4l2_frequency *vf)
    101{
    102	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
    103					  s_frequency, vf);
    104}
    105
    106static long radio_si4713_default(struct file *file, void *p,
    107				 bool valid_prio, unsigned int cmd, void *arg)
    108{
    109	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
    110					  ioctl, cmd, arg);
    111}
    112
    113static const struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
    114	.vidioc_querycap	= radio_si4713_querycap,
    115	.vidioc_g_modulator	= radio_si4713_g_modulator,
    116	.vidioc_s_modulator	= radio_si4713_s_modulator,
    117	.vidioc_g_frequency	= radio_si4713_g_frequency,
    118	.vidioc_s_frequency	= radio_si4713_s_frequency,
    119	.vidioc_log_status      = v4l2_ctrl_log_status,
    120	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
    121	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
    122	.vidioc_default		= radio_si4713_default,
    123};
    124
    125/* radio_si4713_vdev_template - video device interface */
    126static const struct video_device radio_si4713_vdev_template = {
    127	.fops			= &radio_si4713_fops,
    128	.name			= "radio-si4713",
    129	.release		= video_device_release_empty,
    130	.ioctl_ops		= &radio_si4713_ioctl_ops,
    131	.vfl_dir		= VFL_DIR_TX,
    132};
    133
    134/* Platform driver interface */
    135/* radio_si4713_pdriver_probe - probe for the device */
    136static int radio_si4713_pdriver_probe(struct platform_device *pdev)
    137{
    138	struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
    139	struct radio_si4713_device *rsdev;
    140	struct v4l2_subdev *sd;
    141	int rval = 0;
    142
    143	if (!pdata) {
    144		dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
    145		rval = -EINVAL;
    146		goto exit;
    147	}
    148
    149	rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
    150	if (!rsdev) {
    151		dev_err(&pdev->dev, "Failed to alloc video device.\n");
    152		rval = -ENOMEM;
    153		goto exit;
    154	}
    155	mutex_init(&rsdev->lock);
    156
    157	rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
    158	if (rval) {
    159		dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
    160		goto exit;
    161	}
    162
    163	sd = i2c_get_clientdata(pdata->subdev);
    164	rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
    165	if (rval) {
    166		dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
    167		goto unregister_v4l2_dev;
    168	}
    169
    170	rsdev->radio_dev = radio_si4713_vdev_template;
    171	rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
    172	rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
    173	/* Serialize all access to the si4713 */
    174	rsdev->radio_dev.lock = &rsdev->lock;
    175	rsdev->radio_dev.device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
    176	video_set_drvdata(&rsdev->radio_dev, rsdev);
    177	if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
    178		dev_err(&pdev->dev, "Could not register video device.\n");
    179		rval = -EIO;
    180		goto unregister_v4l2_dev;
    181	}
    182	dev_info(&pdev->dev, "New device successfully probed\n");
    183
    184	goto exit;
    185
    186unregister_v4l2_dev:
    187	v4l2_device_unregister(&rsdev->v4l2_dev);
    188exit:
    189	return rval;
    190}
    191
    192/* radio_si4713_pdriver_remove - remove the device */
    193static int radio_si4713_pdriver_remove(struct platform_device *pdev)
    194{
    195	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
    196	struct radio_si4713_device *rsdev;
    197
    198	rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
    199	video_unregister_device(&rsdev->radio_dev);
    200	v4l2_device_unregister(&rsdev->v4l2_dev);
    201
    202	return 0;
    203}
    204
    205static struct platform_driver radio_si4713_pdriver = {
    206	.driver		= {
    207		.name	= "radio-si4713",
    208	},
    209	.probe		= radio_si4713_pdriver_probe,
    210	.remove         = radio_si4713_pdriver_remove,
    211};
    212
    213module_platform_driver(radio_si4713_pdriver);