--- /dev/null
+/*
+ * Framework for ISA radio drivers.
+ * This takes care of all the V4L2 scaffolding, allowing the ISA drivers
+ * to concentrate on the actual hardware operation.
+ *
+ * Copyright (C) 2012 Hans Verkuil <hans.verkuil@cisco.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/videodev2.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+
+#include "radio-isa.h"
+
+MODULE_AUTHOR("Hans Verkuil");
+MODULE_DESCRIPTION("A framework for ISA radio drivers.");
+MODULE_LICENSE("GPL");
+
+#define FREQ_LOW (87U * 16000U)
+#define FREQ_HIGH (108U * 16000U)
+
+static int radio_isa_querycap(struct file *file, void *priv,
+ struct v4l2_capability *v)
+{
+ struct radio_isa_card *isa = video_drvdata(file);
+
+ strlcpy(v->driver, isa->drv->driver.driver.name, sizeof(v->driver));
+ strlcpy(v->card, isa->drv->card, sizeof(v->card));
+ snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", isa->v4l2_dev.name);
+
+ v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+ v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
+ return 0;
+}
+
+static int radio_isa_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct radio_isa_card *isa = video_drvdata(file);
+ const struct radio_isa_ops *ops = isa->drv->ops;
+
+ if (v->index > 0)
+ return -EINVAL;
+
+ strlcpy(v->name, "FM", sizeof(v->name));
+ v->type = V4L2_TUNER_RADIO;
+ v->rangelow = FREQ_LOW;
+ v->rangehigh = FREQ_HIGH;
+ v->capability = V4L2_TUNER_CAP_LOW;
+ if (isa->drv->has_stereo)
+ v->capability |= V4L2_TUNER_CAP_STEREO;
+
+ if (ops->g_rxsubchans)
+ v->rxsubchans = ops->g_rxsubchans(isa);
+ else
+ v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+ v->audmode = isa->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
+ if (ops->g_signal)
+ v->signal = ops->g_signal(isa);
+ else
+ v->signal = (v->rxsubchans & V4L2_TUNER_SUB_STEREO) ?
+ 0xffff : 0;
+ return 0;
+}
+
+static int radio_isa_s_tuner(struct file *file, void *priv,
+ const struct v4l2_tuner *v)
+{
+ struct radio_isa_card *isa = video_drvdata(file);
+ const struct radio_isa_ops *ops = isa->drv->ops;
+
+ if (v->index)
+ return -EINVAL;
+ if (ops->s_stereo) {
+ isa->stereo = (v->audmode == V4L2_TUNER_MODE_STEREO);
+ return ops->s_stereo(isa, isa->stereo);
+ }
+ return 0;
+}
+
+static int radio_isa_s_frequency(struct file *file, void *priv,
+ const struct v4l2_frequency *f)
+{
+ struct radio_isa_card *isa = video_drvdata(file);
+ u32 freq = f->frequency;
+ int res;
+
+ if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
+ return -EINVAL;
+ freq = clamp(freq, FREQ_LOW, FREQ_HIGH);
+ res = isa->drv->ops->s_frequency(isa, freq);
+ if (res == 0)
+ isa->freq = freq;
+ return res;
+}
+
+static int radio_isa_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct radio_isa_card *isa = video_drvdata(file);
+
+ if (f->tuner != 0)
+ return -EINVAL;
+ f->type = V4L2_TUNER_RADIO;
+ f->frequency = isa->freq;
+ return 0;
+}
+
+static int radio_isa_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct radio_isa_card *isa =
+ container_of(ctrl->handler, struct radio_isa_card, hdl);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ return isa->drv->ops->s_mute_volume(isa, ctrl->val,
+ isa->volume ? isa->volume->val : 0);
+ }
+ return -EINVAL;
+}
+
+static int radio_isa_log_status(struct file *file, void *priv)
+{
+ struct radio_isa_card *isa = video_drvdata(file);
+
+ v4l2_info(&isa->v4l2_dev, "I/O Port = 0x%03x\n", isa->io);
+ v4l2_ctrl_handler_log_status(&isa->hdl, isa->v4l2_dev.name);
+ return 0;
+}
+
+static const struct v4l2_ctrl_ops radio_isa_ctrl_ops = {
+ .s_ctrl = radio_isa_s_ctrl,
+};
+
+static const struct v4l2_file_operations radio_isa_fops = {
+ .owner = THIS_MODULE,
+ .open = v4l2_fh_open,
+ .release = v4l2_fh_release,
+ .poll = v4l2_ctrl_poll,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops radio_isa_ioctl_ops = {
+ .vidioc_querycap = radio_isa_querycap,
+ .vidioc_g_tuner = radio_isa_g_tuner,
+ .vidioc_s_tuner = radio_isa_s_tuner,
+ .vidioc_g_frequency = radio_isa_g_frequency,
+ .vidioc_s_frequency = radio_isa_s_frequency,
+ .vidioc_log_status = radio_isa_log_status,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+int radio_isa_match(struct device *pdev, unsigned int dev)
+{
+ struct radio_isa_driver *drv = pdev->platform_data;
+
+ return drv->probe || drv->io_params[dev] >= 0;
+}
+EXPORT_SYMBOL_GPL(radio_isa_match);
+
+static bool radio_isa_valid_io(const struct radio_isa_driver *drv, int io)
+{
+ int i;
+
+ for (i = 0; i < drv->num_of_io_ports; i++)
+ if (drv->io_ports[i] == io)
+ return true;
+ return false;
+}
+
+static struct radio_isa_card *radio_isa_alloc(struct radio_isa_driver *drv,
+ struct device *pdev)
+{
+ struct v4l2_device *v4l2_dev;
+ struct radio_isa_card *isa = drv->ops->alloc();
+ if (!isa)
+ return NULL;
+
+ dev_set_drvdata(pdev, isa);
+ isa->drv = drv;
+ v4l2_dev = &isa->v4l2_dev;
+ strlcpy(v4l2_dev->name, dev_name(pdev), sizeof(v4l2_dev->name));
+
+ return isa;
+}
+
+static int radio_isa_common_probe(struct radio_isa_card *isa,
+ struct device *pdev,
+ int radio_nr, unsigned region_size)
+{
+ const struct radio_isa_driver *drv = isa->drv;
+ const struct radio_isa_ops *ops = drv->ops;
+ struct v4l2_device *v4l2_dev = &isa->v4l2_dev;
+ int res;
+
+ if (!request_region(isa->io, region_size, v4l2_dev->name)) {
+ v4l2_err(v4l2_dev, "port 0x%x already in use\n", isa->io);
+ kfree(isa);
+ return -EBUSY;
+ }
+
+ res = v4l2_device_register(pdev, v4l2_dev);
+ if (res < 0) {
+ v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
+ goto err_dev_reg;
+ }
+
+ v4l2_ctrl_handler_init(&isa->hdl, 1);
+ isa->mute = v4l2_ctrl_new_std(&isa->hdl, &radio_isa_ctrl_ops,
+ V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+ if (drv->max_volume)
+ isa->volume = v4l2_ctrl_new_std(&isa->hdl, &radio_isa_ctrl_ops,
+ V4L2_CID_AUDIO_VOLUME, 0, drv->max_volume, 1,
+ drv->max_volume);
+ v4l2_dev->ctrl_handler = &isa->hdl;
+ if (isa->hdl.error) {
+ res = isa->hdl.error;
+ v4l2_err(v4l2_dev, "Could not register controls\n");
+ goto err_hdl;
+ }
+ if (drv->max_volume)
+ v4l2_ctrl_cluster(2, &isa->mute);
+ v4l2_dev->ctrl_handler = &isa->hdl;
+
+ mutex_init(&isa->lock);
+ isa->vdev.lock = &isa->lock;
+ strlcpy(isa->vdev.name, v4l2_dev->name, sizeof(isa->vdev.name));
+ isa->vdev.v4l2_dev = v4l2_dev;
+ isa->vdev.fops = &radio_isa_fops;
+ isa->vdev.ioctl_ops = &radio_isa_ioctl_ops;
+ isa->vdev.release = video_device_release_empty;
+ video_set_drvdata(&isa->vdev, isa);
+ isa->freq = FREQ_LOW;
+ isa->stereo = drv->has_stereo;
+
+ if (ops->init)
+ res = ops->init(isa);
+ if (!res)
+ res = v4l2_ctrl_handler_setup(&isa->hdl);
+ if (!res)
+ res = ops->s_frequency(isa, isa->freq);
+ if (!res && ops->s_stereo)
+ res = ops->s_stereo(isa, isa->stereo);
+ if (res < 0) {
+ v4l2_err(v4l2_dev, "Could not setup card\n");
+ goto err_hdl;
+ }
+ res = video_register_device(&isa->vdev, VFL_TYPE_RADIO, radio_nr);
+
+ if (res < 0) {
+ v4l2_err(v4l2_dev, "Could not register device node\n");
+ goto err_hdl;
+ }
+
+ v4l2_info(v4l2_dev, "Initialized radio card %s on port 0x%03x\n",
+ drv->card, isa->io);
+ return 0;
+
+err_hdl:
+ v4l2_ctrl_handler_free(&isa->hdl);
+err_dev_reg:
+ release_region(isa->io, region_size);
+ kfree(isa);
+ return res;
+}
+
+static int radio_isa_common_remove(struct radio_isa_card *isa,
+ unsigned region_size)
+{
+ const struct radio_isa_ops *ops = isa->drv->ops;
+
+ ops->s_mute_volume(isa, true, isa->volume ? isa->volume->cur.val : 0);
+ video_unregister_device(&isa->vdev);
+ v4l2_ctrl_handler_free(&isa->hdl);
+ v4l2_device_unregister(&isa->v4l2_dev);
+ release_region(isa->io, region_size);
+ v4l2_info(&isa->v4l2_dev, "Removed radio card %s\n", isa->drv->card);
+ kfree(isa);
+ return 0;
+}
+
+int radio_isa_probe(struct device *pdev, unsigned int dev)
+{
+ struct radio_isa_driver *drv = pdev->platform_data;
+ const struct radio_isa_ops *ops = drv->ops;
+ struct v4l2_device *v4l2_dev;
+ struct radio_isa_card *isa;
+
+ isa = radio_isa_alloc(drv, pdev);
+ if (!isa)
+ return -ENOMEM;
+ isa->io = drv->io_params[dev];
+ v4l2_dev = &isa->v4l2_dev;
+
+ if (drv->probe && ops->probe) {
+ int i;
+
+ for (i = 0; i < drv->num_of_io_ports; ++i) {
+ int io = drv->io_ports[i];
+
+ if (request_region(io, drv->region_size, v4l2_dev->name)) {
+ bool found = ops->probe(isa, io);
+
+ release_region(io, drv->region_size);
+ if (found) {
+ isa->io = io;
+ break;
+ }
+ }
+ }
+ }
+
+ if (!radio_isa_valid_io(drv, isa->io)) {
+ int i;
+
+ if (isa->io < 0)
+ return -ENODEV;
+ v4l2_err(v4l2_dev, "you must set an I/O address with io=0x%03x",
+ drv->io_ports[0]);
+ for (i = 1; i < drv->num_of_io_ports; i++)
+ printk(KERN_CONT "/0x%03x", drv->io_ports[i]);
+ printk(KERN_CONT ".\n");
+ kfree(isa);
+ return -EINVAL;
+ }
+
+ return radio_isa_common_probe(isa, pdev, drv->radio_nr_params[dev],
+ drv->region_size);
+}
+EXPORT_SYMBOL_GPL(radio_isa_probe);
+
+int radio_isa_remove(struct device *pdev, unsigned int dev)
+{
+ struct radio_isa_card *isa = dev_get_drvdata(pdev);
+
+ return radio_isa_common_remove(isa, isa->drv->region_size);
+}
+EXPORT_SYMBOL_GPL(radio_isa_remove);
+
+#ifdef CONFIG_PNP
+int radio_isa_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
+{
+ struct pnp_driver *pnp_drv = to_pnp_driver(dev->dev.driver);
+ struct radio_isa_driver *drv = container_of(pnp_drv,
+ struct radio_isa_driver, pnp_driver);
+ struct radio_isa_card *isa;
+
+ if (!pnp_port_valid(dev, 0))
+ return -ENODEV;
+
+ isa = radio_isa_alloc(drv, &dev->dev);
+ if (!isa)
+ return -ENOMEM;
+
+ isa->io = pnp_port_start(dev, 0);
+
+ return radio_isa_common_probe(isa, &dev->dev, drv->radio_nr_params[0],
+ pnp_port_len(dev, 0));
+}
+EXPORT_SYMBOL_GPL(radio_isa_pnp_probe);
+
+void radio_isa_pnp_remove(struct pnp_dev *dev)
+{
+ struct radio_isa_card *isa = dev_get_drvdata(&dev->dev);
+
+ radio_isa_common_remove(isa, pnp_port_len(dev, 0));
+}
+EXPORT_SYMBOL_GPL(radio_isa_pnp_remove);
+#endif
Code Review / kvmfornfv.git / blobdiff