radio-timb.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * radio-timb.c Timberdale FPGA Radio driver
  4 * Copyright (c) 2009 Intel Corporation
  5 */
  6
  7#include <linux/io.h>
  8#include <media/v4l2-ioctl.h>
  9#include <media/v4l2-device.h>
 10#include <media/v4l2-ctrls.h>
 11#include <media/v4l2-event.h>
 12#include <linux/platform_device.h>
 13#include <linux/interrupt.h>
 14#include <linux/slab.h>
 15#include <linux/i2c.h>
 16#include <linux/module.h>
 17#include <linux/platform_data/media/timb_radio.h>
 18
 19#define DRIVER_NAME "timb-radio"
 20
 21struct timbradio {
 22	struct timb_radio_platform_data	pdata;
 23	struct v4l2_subdev	*sd_tuner;
 24	struct v4l2_subdev	*sd_dsp;
 25	struct video_device	video_dev;
 26	struct v4l2_device	v4l2_dev;
 27	struct mutex		lock;
 28};
 29
 30
 31static int timbradio_vidioc_querycap(struct file *file, void  *priv,
 32	struct v4l2_capability *v)
 33{
 34	strscpy(v->driver, DRIVER_NAME, sizeof(v->driver));
 35	strscpy(v->card, "Timberdale Radio", sizeof(v->card));
 36	snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
 37	return 0;
 38}
 39
 40static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
 41	struct v4l2_tuner *v)
 42{
 43	struct timbradio *tr = video_drvdata(file);
 44	return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
 45}
 46
 47static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
 48	const struct v4l2_tuner *v)
 49{
 50	struct timbradio *tr = video_drvdata(file);
 51	return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
 52}
 53
 54static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
 55	const struct v4l2_frequency *f)
 56{
 57	struct timbradio *tr = video_drvdata(file);
 58	return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
 59}
 60
 61static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
 62	struct v4l2_frequency *f)
 63{
 64	struct timbradio *tr = video_drvdata(file);
 65	return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
 66}
 67
 68static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
 69	.vidioc_querycap	= timbradio_vidioc_querycap,
 70	.vidioc_g_tuner		= timbradio_vidioc_g_tuner,
 71	.vidioc_s_tuner		= timbradio_vidioc_s_tuner,
 72	.vidioc_g_frequency	= timbradio_vidioc_g_frequency,
 73	.vidioc_s_frequency	= timbradio_vidioc_s_frequency,
 74	.vidioc_log_status      = v4l2_ctrl_log_status,
 75	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 76	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 77};
 78
 79static const struct v4l2_file_operations timbradio_fops = {
 80	.owner		= THIS_MODULE,
 81	.open		= v4l2_fh_open,
 82	.release	= v4l2_fh_release,
 83	.poll		= v4l2_ctrl_poll,
 84	.unlocked_ioctl	= video_ioctl2,
 85};
 86
 87static int timbradio_probe(struct platform_device *pdev)
 88{
 89	struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
 90	struct timbradio *tr;
 91	int err;
 92
 93	if (!pdata) {
 94		dev_err(&pdev->dev, "Platform data missing\n");
 95		err = -EINVAL;
 96		goto err;
 97	}
 98
 99	tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
100	if (!tr) {
101		err = -ENOMEM;
102		goto err;
103	}
104
105	tr->pdata = *pdata;
106	mutex_init(&tr->lock);
107
108	strscpy(tr->video_dev.name, "Timberdale Radio",
109		sizeof(tr->video_dev.name));
110	tr->video_dev.fops = &timbradio_fops;
111	tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
112	tr->video_dev.release = video_device_release_empty;
113	tr->video_dev.minor = -1;
114	tr->video_dev.lock = &tr->lock;
115	tr->video_dev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
116
117	strscpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
118	err = v4l2_device_register(NULL, &tr->v4l2_dev);
119	if (err)
120		goto err;
121
122	tr->video_dev.v4l2_dev = &tr->v4l2_dev;
123
124	tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
125		i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
126	tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
127		i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
128	if (tr->sd_tuner == NULL || tr->sd_dsp == NULL) {
129		err = -ENODEV;
130		goto err_video_req;
131	}
132
133	tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
134
135	err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
136	if (err) {
137		dev_err(&pdev->dev, "Error reg video\n");
138		goto err_video_req;
139	}
140
141	video_set_drvdata(&tr->video_dev, tr);
142
143	platform_set_drvdata(pdev, tr);
144	return 0;
145
146err_video_req:
147	v4l2_device_unregister(&tr->v4l2_dev);
148err:
149	dev_err(&pdev->dev, "Failed to register: %d\n", err);
150
151	return err;
152}
153
154static void timbradio_remove(struct platform_device *pdev)
155{
156	struct timbradio *tr = platform_get_drvdata(pdev);
157
158	video_unregister_device(&tr->video_dev);
159	v4l2_device_unregister(&tr->v4l2_dev);
160}
161
162static struct platform_driver timbradio_platform_driver = {
163	.driver = {
164		.name	= DRIVER_NAME,
165	},
166	.probe		= timbradio_probe,
167	.remove		= timbradio_remove,
168};
169
170module_platform_driver(timbradio_platform_driver);
171
172MODULE_DESCRIPTION("Timberdale Radio driver");
173MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
174MODULE_LICENSE("GPL v2");
175MODULE_VERSION("0.0.2");
176MODULE_ALIAS("platform:"DRIVER_NAME);