--- /dev/null
+/*
+ * 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 <eduardo.valentin@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <linux/slab.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#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 <eduardo.valentin@nokia.com>");
+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)
+{
+ strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
+ strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
+ sizeof(capability->card));
+ strlcpy(capability->bus_info, "platform:radio-si4713",
+ sizeof(capability->bus_info));
+ capability->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
+ capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
+
+ 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 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 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;
+ 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 int 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);
+
+ return 0;
+}
+
+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);
Code Review / kvmfornfv.git / blobdiff