On Wednesday 27 January 2010 17:22:08 Richard Röjfors wrote:
> 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.rojf...@pelagicore.com>
> ---
> diff --git a/drivers/media/radio/radio-timb.c
> b/drivers/media/radio/radio-timb.c
> new file mode 100644
> index 0000000..276b105
> --- /dev/null
> +++ b/drivers/media/radio/radio-timb.c
> @@ -0,0 +1,469 @@
> +/*
> + * 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/io.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 v4l2_subdev *sd_dsp;
> + struct video_device *video_dev;
> + struct v4l2_device v4l2_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 | V4L2_CAP_RDS_CAPTURE;
> + return 0;
> +}
> +
> +static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
> + struct v4l2_tuner *v)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
> +}
> +
> +static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
> + struct v4l2_tuner *v)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
> +}
> +
> +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);
> + return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
> +}
> +
> +static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
> + struct v4l2_frequency *f)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
> +}
> +
> +static int timbradio_vidioc_queryctrl(struct file *file, void *priv,
> + struct v4l2_queryctrl *qc)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + return v4l2_subdev_call(tr->sd_dsp, core, queryctrl, qc);
> +}
> +
> +static int timbradio_vidioc_g_ctrl(struct file *file, void *priv,
> + struct v4l2_control *ctrl)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + return v4l2_subdev_call(tr->sd_dsp, core, g_ctrl, ctrl);
> +}
> +
> +static int timbradio_vidioc_s_ctrl(struct file *file, void *priv,
> + struct v4l2_control *ctrl)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + return v4l2_subdev_call(tr->sd_dsp, core, s_ctrl, ctrl);
> +}
> +
> +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);
> + unsigned int outblocks = 0;
> +
> + if (count < sizeof(struct v4l2_rds_data))
> + return -EINVAL;
> +
> + /* 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;
> + }
> +
> + mutex_lock(&tr->lock);
> + count /= sizeof(struct v4l2_rds_data);
> +
> + while (outblocks < count) {
> + struct v4l2_rds_data rds_data;
> +
> + rds_data.msb = tr->buffer[tr->rd_index++];
> + rds_data.lsb = tr->buffer[tr->rd_index++];
> + tr->rd_index %= RDS_BUFFER_SIZE;
> +
> + rds_data.block = V4L2_RDS_BLOCK_A;
Always block A? That seems weird and unlikely.
> +
> + if (copy_to_user(buf + outblocks * sizeof(rds_data), &rds_data,
> + sizeof(rds_data))) {
> + mutex_unlock(&tr->lock);
> + return -EFAULT;
> + }
> +
> + outblocks++;
> +
> + if (tr->rd_index == tr->wr_index)
> + break;
> + }
> + mutex_unlock(&tr->lock);
> +
> + return outblocks * sizeof(struct v4l2_rds_data);
> +}
> +
> +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;
> +};
Obsolete struct.
> +
> +static int timbradio_rds_fops_open(struct file *file)
> +{
> + struct timbradio *tr = video_drvdata(file);
> + struct i2c_adapter *adapt;
> + int err = 0;
> +
> + mutex_lock(&tr->lock);
> + if (tr->open_count)
> + goto out;
> +
> + /* device currently not open, check if the DSP and tuner is not
> + * yet found, in that case find them
> + */
> +
> + /* 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 */
> + if (!tr->sd_dsp)
> + tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev, adapt,
> + tr->pdata.dsp.module_name, tr->pdata.dsp.info, NULL);
> +
> + if (!tr->sd_tuner)
> + tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev, adapt,
> + tr->pdata.tuner.module_name, tr->pdata.tuner.info,
> + NULL);
> +
> + i2c_put_adapter(adapt);
> +
> + if (!tr->sd_tuner || !tr->sd_dsp) {
> + printk(KERN_ERR DRIVER_NAME
> + ": Failed to get tuner or DSP\n");
> + err = -ENODEV;
> + goto out;
> + }
> +
> + /* enable the IRQ for receiving RDS data */
> + err = request_irq(tr->rds_irq, timbradio_irq, 0, DRIVER_NAME, tr);
> +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 __devinit 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));
Just do 'tr->pdata = *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);
> +
> + strlcpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
> + err = v4l2_device_register(NULL, &tr->v4l2_dev);
> + if (err)
> + goto err_v4l2_dev;
> +
> + tr->video_dev->v4l2_dev = &tr->v4l2_dev;
> +
> + 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:
> + v4l2_device_unregister(&tr->v4l2_dev);
> +err_v4l2_dev:
> + 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 __devexit 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);
> +
> + v4l2_device_unregister(&tr->v4l2_dev);
> +
> + 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 <i...@mocean-labs.com>");
> +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..fcd32a3
> --- /dev/null
> +++ b/include/media/timb_radio.h
> @@ -0,0 +1,36 @@
> +/*
> + * 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_ 1
> +
> +#include <linux/i2c.h>
> +
> +struct timb_radio_platform_data {
> + int i2c_adapter; /* I2C adapter where the tuner and dsp are attached */
> + struct {
> + const char *module_name;
> + struct i2c_board_info *info;
> + } tuner;
> + struct {
> + const char *module_name;
> + struct i2c_board_info *info;
> + } dsp;
> +};
> +
> +#endif
>
>
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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