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