This patch add supports for the radio system on the Intel Russellville board.
It's a In-Vehicle Infotainment board with a radio tuner and DSP.
This umbrella driver has the DSP and tuner as V4L2 subdevs and calls them
when needed.
The RDS support is done by I/O memory accesses.
Signed-off-by: Richard Röjfors <richard.rojfors@xxxxxxxxxxxxxx>
---
diff --git a/drivers/media/radio/radio-timb.c b/drivers/media/radio/radio-timb.c
new file mode 100644
index 0000000..3dbe9ad
--- /dev/null
+++ b/drivers/media/radio/radio-timb.c
@@ -0,0 +1,543 @@
+/*
+ * radio-timb.c Timberdale FPGA Radio driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <media/timb_radio.h>
+
+#define DRIVER_NAME "timb-radio"
+
+#define RDS_BLOCK_SIZE 4
+#define RDS_BUFFER_SIZE (RDS_BLOCK_SIZE * 100)
+
+struct timbradio {
+ struct mutex lock; /* for mutual exclusion */
+ void __iomem *membase;
+ struct timb_radio_platform_data pdata;
+ struct v4l2_subdev *sd_tuner;
+ struct module *tuner_owner;
+ struct v4l2_subdev *sd_dsp;
+ struct module *dsp_owner;
+ struct video_device *video_dev;
+ /* RDS related */
+ int open_count;
+ int rds_irq;
+ wait_queue_head_t read_queue;
+ unsigned char buffer[RDS_BUFFER_SIZE];
+ unsigned int rd_index;
+ unsigned int wr_index;
+};
+
+
+static int timbradio_vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *v)
+{
+ strlcpy(v->driver, DRIVER_NAME, sizeof(v->driver));
+ strlcpy(v->card, "Timberdale Radio", sizeof(v->card));
+ snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
+ v->version = KERNEL_VERSION(0, 0, 1);
+ v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+ return 0;
+}
+
+static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static int timbradio_vidioc_g_input(struct file *filp, void *priv,
+ unsigned int *i)
+{
+ *i = 0;
+ return 0;
+}
+
+static int timbradio_vidioc_s_input(struct file *filp, void *priv,
+ unsigned int i)
+{
+ return i ? -EINVAL : 0;
+}
+
+static int timbradio_vidioc_g_audio(struct file *file, void *priv,
+ struct v4l2_audio *a)
+{
+ a->index = 0;
+ strlcpy(a->name, "Radio", sizeof(a->name));
+ a->capability = V4L2_AUDCAP_STEREO;
+ return 0;
+}
+
+
+static int timbradio_vidioc_s_audio(struct file *file, void *priv,
+ struct v4l2_audio *a)
+{
+ return a->index ? -EINVAL : 0;
+}
+
+static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static int timbradio_vidioc_queryctrl(struct file *file, void *priv,
+ struct v4l2_queryctrl *qc)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_dsp, core, queryctrl, qc);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static int timbradio_vidioc_g_ctrl(struct file *file, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_dsp, core, g_ctrl, ctrl);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static int timbradio_vidioc_s_ctrl(struct file *file, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&tr->lock);
+ ret = v4l2_subdev_call(tr->sd_dsp, core, s_ctrl, ctrl);
+ mutex_unlock(&tr->lock);
+
+ return ret;
+}
+
+static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
+ .vidioc_querycap = timbradio_vidioc_querycap,
+ .vidioc_g_tuner = timbradio_vidioc_g_tuner,
+ .vidioc_s_tuner = timbradio_vidioc_s_tuner,
+ .vidioc_g_frequency = timbradio_vidioc_g_frequency,
+ .vidioc_s_frequency = timbradio_vidioc_s_frequency,
+ .vidioc_g_input = timbradio_vidioc_g_input,
+ .vidioc_s_input = timbradio_vidioc_s_input,
+ .vidioc_g_audio = timbradio_vidioc_g_audio,
+ .vidioc_s_audio = timbradio_vidioc_s_audio,
+ .vidioc_queryctrl = timbradio_vidioc_queryctrl,
+ .vidioc_g_ctrl = timbradio_vidioc_g_ctrl,
+ .vidioc_s_ctrl = timbradio_vidioc_s_ctrl
+};
+
+static irqreturn_t timbradio_irq(int irq, void *devid)
+{
+ struct timbradio *tr = devid;
+ u32 data = ioread32(tr->membase);
+
+ tr->buffer[tr->wr_index++] = data >> 24;
+ tr->buffer[tr->wr_index++] = data >> 16;
+ tr->buffer[tr->wr_index++] = data >> 8;
+ tr->buffer[tr->wr_index++] = data;
+ tr->wr_index %= RDS_BUFFER_SIZE;
+
+ wake_up(&tr->read_queue);
+
+ /* new RDS data received, read it */
+ return IRQ_HANDLED;
+}
+
+/**************************************************************************
+ * File Operations Interface
+ **************************************************************************/
+
+static ssize_t timbradio_rds_fops_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int outblocks = 0;
+
+ /* block if no new data available */
+ while (tr->wr_index == tr->rd_index) {
+ if (file->f_flags & O_NONBLOCK)
+ return -EWOULDBLOCK;
+
+ if (wait_event_interruptible(tr->read_queue,
+ tr->wr_index != tr->rd_index))
+ return -EINTR;
+ }
+
+ count /= RDS_BLOCK_SIZE;
+ /* copy RDS block out of internal buffer and to user buffer */
+ mutex_lock(&tr->lock);
+ while (outblocks < count) {
+ if (tr->rd_index == tr->wr_index)
+ break;
+
+ if (copy_to_user(buf, tr->buffer + tr->rd_index,
+ RDS_BLOCK_SIZE))
+ break;
+ tr->rd_index += RDS_BLOCK_SIZE;
+ tr->rd_index %= RDS_BUFFER_SIZE;
+ outblocks++;
+ }
+ mutex_unlock(&tr->lock);
+
+ return outblocks * RDS_BLOCK_SIZE;
+}
+
+static unsigned int timbradio_rds_fops_poll(struct file *file,
+ struct poll_table_struct *pts)
+{
+ struct timbradio *tr = video_drvdata(file);
+
+ poll_wait(file, &tr->read_queue, pts);
+
+ if (tr->rd_index != tr->wr_index)
+ return POLLIN | POLLRDNORM;
+
+ return 0;
+}
+
+struct find_addr_arg {
+ char const *name;
+ struct i2c_client *client;
+};
+
+static int find_name(struct device *dev, void *argp)
+{
+ struct find_addr_arg *arg = (struct find_addr_arg *)argp;
+ struct i2c_client *client = i2c_verify_client(dev);
+
+ if (client && !strcmp(arg->name, client->name) && client->driver)
+ arg->client = client;
+
+ return 0;
+}
+
+static struct i2c_client *find_client(struct i2c_adapter *adapt,
+ const char *name)
+{
+ struct find_addr_arg find_arg;
+ /* now find the client */
+#ifdef MODULE
+ request_module(name);
+#endif
+ /* code for finding the I2C child */
+ find_arg.name = name;
+ find_arg.client = NULL;
+ device_for_each_child(&adapt->dev, &find_arg, find_name);
+ return find_arg.client;
+}
+
+static int timbradio_rds_fops_open(struct file *file)
+{
+ struct timbradio *tr = video_drvdata(file);
+ int err = 0;
+
+ mutex_lock(&tr->lock);
+ if (tr->open_count == 0) {
+ /* device currently not open, check if the DSP and tuner is not
+ * yet found, in that case find them
+ */
+ if (!tr->sd_tuner) {
+ struct i2c_adapter *adapt;
+ struct i2c_client *tuner;
+ struct i2c_client *dsp;
+
+ /* find the I2C bus */
+ adapt = i2c_get_adapter(tr->pdata.i2c_adapter);
+ if (!adapt) {
+ printk(KERN_ERR DRIVER_NAME": No I2C bus\n");
+ err = -ENODEV;
+ goto out;
+ }
+
+ /* now find the tuner and dsp */
+ tuner = find_client(adapt, tr->pdata.tuner);
+ dsp = find_client(adapt, tr->pdata.dsp);
+
+ i2c_put_adapter(adapt);
+
+ if (!tuner || !dsp) {
+ printk(KERN_ERR DRIVER_NAME
+ ": Failed to get tuner or DSP\n");
+ err = -ENODEV;
+ goto out;
+ }
+
+ tr->sd_tuner = i2c_get_clientdata(tuner);
+ tr->sd_dsp = i2c_get_clientdata(dsp);
+
+ tr->tuner_owner = tr->sd_tuner->owner;
+ tr->dsp_owner = tr->sd_dsp->owner;
+ /* Lock the modules */
+ if (!try_module_get(tr->tuner_owner)) {
+ err = -ENODEV;
+ goto err_get_tuner;
+ }
+
+ if (!try_module_get(tr->dsp_owner)) {
+ err = -ENODEV;
+ goto err_get_dsp;
+ }
+ }
+
+ /* enable the IRQ for receiving RDS data */
+ err = request_irq(tr->rds_irq, timbradio_irq, 0, DRIVER_NAME,
+ tr);
+ }
+ goto out;
+
+err_get_dsp:
+ module_put(tr->tuner_owner);
+err_get_tuner:
+ tr->sd_tuner = NULL;
+ tr->sd_dsp = NULL;
+out:
+ if (!err)
+ tr->open_count++;
+ mutex_unlock(&tr->lock);
+ return err;
+}
+
+static int timbradio_rds_fops_release(struct file *file)
+{
+ struct timbradio *tr = video_drvdata(file);
+
+ mutex_lock(&tr->lock);
+ tr->open_count--;
+ if (!tr->open_count) {
+ free_irq(tr->rds_irq, tr);
+
+ tr->wr_index = 0;
+ tr->rd_index = 0;
+
+ /* cancel read processes */
+ wake_up_interruptible(&tr->read_queue);
+ }
+ mutex_unlock(&tr->lock);
+
+ return 0;
+}
+
+
+static const struct v4l2_file_operations timbradio_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = video_ioctl2,
+ .read = timbradio_rds_fops_read,
+ .poll = timbradio_rds_fops_poll,
+ .open = timbradio_rds_fops_open,
+ .release = timbradio_rds_fops_release,
+};
+
+static const struct video_device timbradio_template = {
+ .name = "Timberdale Radio",
+ .fops = &timbradio_fops,
+ .ioctl_ops = &timbradio_ioctl_ops,
+ .release = video_device_release_empty,
+ .minor = -1
+};
+
+
+
+static int timbradio_probe(struct platform_device *pdev)
+{
+ struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
+ struct timbradio *tr;
+ struct resource *iomem;
+ int irq;
+ int err;
+
+ if (!pdata) {
+ printk(KERN_ERR DRIVER_NAME": Platform data missing\n");
+ err = -EINVAL;
+ goto err;
+ }
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iomem) {
+ err = -ENODEV;
+ goto err;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ err = -ENODEV;
+ goto err;
+ }
+
+ if (!request_mem_region(iomem->start, resource_size(iomem),
+ DRIVER_NAME)) {
+ err = -EBUSY;
+ goto err;
+ }
+
+ tr = kzalloc(sizeof(*tr), GFP_KERNEL);
+ if (!tr) {
+ err = -ENOMEM;
+ goto err_alloc;
+ }
+ mutex_init(&tr->lock);
+
+ tr->membase = ioremap(iomem->start, resource_size(iomem));
+ if (!tr->membase) {
+ err = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ memcpy(&tr->pdata, pdata, sizeof(tr->pdata));
+
+ tr->video_dev = video_device_alloc();
+ if (!tr->video_dev) {
+ err = -ENOMEM;
+ goto err_video_req;
+ }
+ *tr->video_dev = timbradio_template;
+ tr->rds_irq = irq;
+ init_waitqueue_head(&tr->read_queue);
+
+ err = video_register_device(tr->video_dev, VFL_TYPE_RADIO, -1);
+ if (err) {
+ printk(KERN_ALERT DRIVER_NAME": Error reg video\n");
+ goto err_video_req;
+ }
+
+ video_set_drvdata(tr->video_dev, tr);
+
+ platform_set_drvdata(pdev, tr);
+ return 0;
+
+err_video_req:
+ if (tr->video_dev->minor != -1)
+ video_unregister_device(tr->video_dev);
+ else
+ video_device_release(tr->video_dev);
+ iounmap(tr->membase);
+err_ioremap:
+ kfree(tr);
+err_alloc:
+ release_mem_region(iomem->start, resource_size(iomem));
+err:
+ printk(KERN_ERR DRIVER_NAME ": Failed to register: %d\n", err);
+
+ return err;
+}
+
+static int timbradio_remove(struct platform_device *pdev)
+{
+ struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ struct timbradio *tr = platform_get_drvdata(pdev);
+
+ if (tr->video_dev->minor != -1)
+ video_unregister_device(tr->video_dev);
+ else
+ video_device_release(tr->video_dev);
+
+ if (tr->sd_tuner) {
+ module_put(tr->tuner_owner);
+ module_put(tr->dsp_owner);
+ }
+
+ iounmap(tr->membase);
+ release_mem_region(iomem->start, resource_size(iomem));
+ kfree(tr);
+
+ return 0;
+}
+
+static struct platform_driver timbradio_platform_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = timbradio_probe,
+ .remove = timbradio_remove,
+};
+
+/*--------------------------------------------------------------------------*/
+
+static int __init timbradio_init(void)
+{
+ return platform_driver_register(&timbradio_platform_driver);
+}
+
+static void __exit timbradio_exit(void)
+{
+ platform_driver_unregister(&timbradio_platform_driver);
+}
+
+module_init(timbradio_init);
+module_exit(timbradio_exit);
+
+MODULE_DESCRIPTION("Timberdale Radio driver");
+MODULE_AUTHOR("Mocean Laboratories <info@xxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:"DRIVER_NAME);
diff --git a/include/media/timb_radio.h b/include/media/timb_radio.h
new file mode 100644
index 0000000..6bea1b9
--- /dev/null
+++ b/include/media/timb_radio.h
@@ -0,0 +1,30 @@
+/*
+ * timb_radio.h Platform struct for the Timberdale radio driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _TIMB_RADIO_
+#define _TIMB_RADIO_
+
+#include <linux/i2c.h>
+
+struct timb_radio_platform_data {
+ int i2c_adapter; /* I2C adapter where the tuner and dsp are attached */
+ char tuner[32];
+ char dsp[32];
+};
+
+#endif
--
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