420 lines
10 KiB
C
420 lines
10 KiB
C
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/*
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* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/bitmap.h>
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#include <linux/cdev.h>
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#include <linux/dcache.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/version.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
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#include <linux/sched/signal.h>
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#endif
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/tegra-ivc.h>
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#include <linux/tegra-ivc-bus.h>
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#include <linux/tegra-ivc-instance.h>
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#include <linux/wait.h>
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#include <asm/ioctls.h>
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#include <asm/uaccess.h>
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#define CCIOGNFRAMES _IOR('c', 1, int)
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#define CCIOGNBYTES _IOR('c', 2, int)
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struct tegra_camchar_data {
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struct cdev cdev;
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struct tegra_ivc_channel *ch;
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struct mutex io_lock;
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wait_queue_head_t waitq;
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bool is_open;
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bool is_established;
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};
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#define DEVICE_COUNT (128)
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static DECLARE_BITMAP(tegra_camchar_minor_map, DEVICE_COUNT);
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static DEFINE_SPINLOCK(tegra_camchar_lock);
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static dev_t tegra_camchar_major_number;
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static struct class *tegra_camchar_class;
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static int tegra_camchar_open(struct inode *in, struct file *f)
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{
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struct tegra_camchar_data *data;
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int ret;
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data = container_of(in->i_cdev, struct tegra_camchar_data, cdev);
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if (data->is_open)
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return -EBUSY;
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ret = tegra_ivc_channel_runtime_get(data->ch);
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if (ret < 0)
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return ret;
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data->is_open = true;
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data->is_established = false;
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f->private_data = data->ch;
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return nonseekable_open(in, f);
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}
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static int tegra_camchar_release(struct inode *in, struct file *fp)
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{
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struct tegra_ivc_channel *ch = fp->private_data;
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struct tegra_camchar_data *data;
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data = tegra_ivc_channel_get_drvdata(ch);
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tegra_ivc_channel_runtime_put(ch);
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data->is_open = false;
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return 0;
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}
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static unsigned int tegra_camchar_poll(struct file *fp, poll_table *pt)
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{
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unsigned int ret = 0;
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struct tegra_ivc_channel *ch = fp->private_data;
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struct tegra_camchar_data *dev_data = tegra_ivc_channel_get_drvdata(ch);
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poll_wait(fp, &dev_data->waitq, pt);
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mutex_lock(&dev_data->io_lock);
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if (tegra_ivc_can_read(&ch->ivc))
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ret |= (POLLIN | POLLRDNORM);
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if (tegra_ivc_can_write(&ch->ivc))
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ret |= (POLLOUT | POLLWRNORM);
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mutex_unlock(&dev_data->io_lock);
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return ret;
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}
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static ssize_t tegra_camchar_read(struct file *fp, char __user *buffer, size_t len,
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loff_t *offset)
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{
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struct tegra_ivc_channel *ch = fp->private_data;
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struct tegra_camchar_data *dev_data = tegra_ivc_channel_get_drvdata(ch);
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DEFINE_WAIT(wait);
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ssize_t ret;
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if (WARN_ON(!ch->is_ready))
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return -EIO;
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len = min_t(size_t, len, ch->ivc.frame_size);
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if (len == 0)
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return 0;
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do {
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ret = mutex_lock_interruptible(&dev_data->io_lock);
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if (ret)
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break;
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prepare_to_wait(&dev_data->waitq, &wait, TASK_INTERRUPTIBLE);
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ret = tegra_ivc_read_user(&ch->ivc, buffer, len);
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mutex_unlock(&dev_data->io_lock);
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if (ret != -ENOMEM)
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;
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else if (signal_pending(current))
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ret = -EINTR;
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else if (fp->f_flags & O_NONBLOCK)
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ret = -EAGAIN;
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else
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schedule();
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finish_wait(&dev_data->waitq, &wait);
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} while (ret == -ENOMEM);
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return ret;
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}
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static ssize_t tegra_camchar_write(struct file *fp, const char __user *buffer,
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size_t len, loff_t *offset)
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{
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struct tegra_ivc_channel *ch = fp->private_data;
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struct tegra_camchar_data *dev_data = tegra_ivc_channel_get_drvdata(ch);
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DEFINE_WAIT(wait);
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ssize_t ret;
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if (WARN_ON(!ch->is_ready))
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return -EIO;
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len = min_t(size_t, len, ch->ivc.frame_size);
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if (len == 0)
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return 0;
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do {
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ret = mutex_lock_interruptible(&dev_data->io_lock);
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if (ret)
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break;
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prepare_to_wait(&dev_data->waitq, &wait, TASK_INTERRUPTIBLE);
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ret = tegra_ivc_write_user(&ch->ivc, buffer, len);
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mutex_unlock(&dev_data->io_lock);
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if (ret > 0)
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dev_data->is_established = true;
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if (ret != -ENOMEM && ret != ECONNRESET)
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;
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else if (ret == ECONNRESET && dev_data->is_established)
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;
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else if (signal_pending(current))
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ret = -EINTR;
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else if (fp->f_flags & O_NONBLOCK)
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ret = -EAGAIN;
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else
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schedule();
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finish_wait(&dev_data->waitq, &wait);
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if (ret == ECONNRESET && dev_data->is_established)
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break;
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} while (ret == -ENOMEM || ret == -ECONNRESET);
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return ret;
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}
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static long tegra_camchar_ioctl(struct file *fp, unsigned int cmd,
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unsigned long arg)
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{
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struct tegra_ivc_channel *ch = fp->private_data;
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struct tegra_camchar_data *dev_data = tegra_ivc_channel_get_drvdata(ch);
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long ret;
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int val = 0;
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mutex_lock(&dev_data->io_lock);
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switch (cmd) {
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/* generic serial port ioctls */
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case FIONREAD:
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ret = 0;
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if (tegra_ivc_can_read(&ch->ivc))
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val = ch->ivc.frame_size;
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ret = put_user(val, (int __user *)arg);
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break;
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/* ioctls specific to this device */
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case CCIOGNFRAMES:
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val = ch->ivc.nframes;
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ret = put_user(val, (int __user *)arg);
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break;
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case CCIOGNBYTES:
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val = ch->ivc.frame_size;
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ret = put_user(val, (int __user *)arg);
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break;
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default:
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ret = -ENOTTY;
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}
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mutex_unlock(&dev_data->io_lock);
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return ret;
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}
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static const struct file_operations tegra_camchar_fops = {
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.open = tegra_camchar_open,
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.poll = tegra_camchar_poll,
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.read = tegra_camchar_read,
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.write = tegra_camchar_write,
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.release = tegra_camchar_release,
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.unlocked_ioctl = tegra_camchar_ioctl,
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.compat_ioctl = tegra_camchar_ioctl,
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.llseek = no_llseek,
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};
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static int __init tegra_camchar_init(struct tegra_ivc_driver *drv)
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{
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int ret;
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dev_t start;
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ret = alloc_chrdev_region(&start, 0, DEVICE_COUNT, "camchar");
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if (ret) {
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pr_alert("camchar: failed to allocate device numbers\n");
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return ret;
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}
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tegra_camchar_major_number = MAJOR(start);
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tegra_camchar_class = class_create(THIS_MODULE, "camchar_class");
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if (IS_ERR(tegra_camchar_class)) {
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pr_alert("camchar: failed to create class\n");
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ret = PTR_ERR(tegra_camchar_class);
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goto init_err_class;
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}
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ret = tegra_ivc_driver_register(drv);
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if (ret) {
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pr_alert("camchar: ivc driver registration failed\n");
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goto init_err_ivc;
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}
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pr_info("camchar: rtcpu character device driver loaded\n");
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return 0;
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init_err_ivc:
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class_destroy(tegra_camchar_class);
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init_err_class:
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unregister_chrdev_region(start, DEVICE_COUNT);
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return ret;
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}
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static void __exit tegra_camchar_exit(struct tegra_ivc_driver *drv)
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{
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dev_t num = MKDEV(tegra_camchar_major_number, 0);
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tegra_ivc_driver_unregister(drv);
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class_destroy(tegra_camchar_class);
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unregister_chrdev_region(num, DEVICE_COUNT);
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tegra_camchar_major_number = 0;
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pr_info("camchar: unloaded rtcpu character device driver\n");
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}
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static void tegra_camchar_notify(struct tegra_ivc_channel *ch)
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{
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struct tegra_camchar_data *dev_data = tegra_ivc_channel_get_drvdata(ch);
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wake_up_interruptible(&dev_data->waitq);
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}
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static int tegra_camchar_get_minor(void)
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{
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int minor;
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spin_lock(&tegra_camchar_lock);
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minor = find_first_zero_bit(tegra_camchar_minor_map, DEVICE_COUNT);
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if (minor < DEVICE_COUNT)
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set_bit(minor, tegra_camchar_minor_map);
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else
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minor = -ENODEV;
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spin_unlock(&tegra_camchar_lock);
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return minor;
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}
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static void tegra_camchar_put_minor(unsigned minor)
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{
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spin_lock(&tegra_camchar_lock);
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if (minor < DEVICE_COUNT)
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clear_bit(minor, tegra_camchar_minor_map);
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spin_unlock(&tegra_camchar_lock);
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}
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static int tegra_camchar_probe(struct tegra_ivc_channel *ch)
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{
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const char *devname;
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struct tegra_camchar_data *data;
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int ret, minor;
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dev_t num;
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struct device *dummy;
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devname = of_device_get_match_data(&ch->dev);
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if (devname == NULL) {
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ret = of_property_read_string(ch->dev.of_node,
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"nvidia,devname", &devname);
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if (ret != 0)
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return ret;
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}
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dev_dbg(&ch->dev, "probing /dev/%s", devname);
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data = devm_kzalloc(&ch->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->ch = ch;
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cdev_init(&data->cdev, &tegra_camchar_fops);
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data->cdev.owner = THIS_MODULE;
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init_waitqueue_head(&data->waitq);
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mutex_init(&data->io_lock);
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tegra_ivc_channel_set_drvdata(ch, data);
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minor = tegra_camchar_get_minor();
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if (minor < 0)
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return minor;
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num = MKDEV(tegra_camchar_major_number, minor);
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ret = cdev_add(&data->cdev, num, 1);
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if (ret) {
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dev_warn(&ch->dev, "cannot add /dev/%s\n", devname);
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tegra_camchar_put_minor(minor);
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return ret;
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}
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dummy = device_create(tegra_camchar_class, &ch->dev, num, NULL,
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"%s", devname);
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if (IS_ERR(dummy)) {
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dev_err(&ch->dev, "cannot create /dev/%s\n", devname);
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tegra_camchar_put_minor(minor);
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return PTR_ERR(dummy);
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}
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|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void tegra_camchar_remove(struct tegra_ivc_channel *ch)
|
||
|
|
{
|
||
|
|
struct tegra_camchar_data *data = tegra_ivc_channel_get_drvdata(ch);
|
||
|
|
dev_t num = data->cdev.dev;
|
||
|
|
|
||
|
|
device_destroy(tegra_camchar_class, num);
|
||
|
|
cdev_del(&data->cdev);
|
||
|
|
tegra_camchar_put_minor(MINOR(num));
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct tegra_ivc_channel_ops tegra_ivc_channel_chardev_ops = {
|
||
|
|
.probe = tegra_camchar_probe,
|
||
|
|
.remove = tegra_camchar_remove,
|
||
|
|
.notify = tegra_camchar_notify,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct of_device_id camchar_of_match[] = {
|
||
|
|
{ .compatible = "nvidia,tegra-ivc-cdev" },
|
||
|
|
{ .compatible = "nvidia,tegra186-camera-ivc-protocol-echo",
|
||
|
|
.data = (void *)"camchar-echo", },
|
||
|
|
{ .compatible = "nvidia,tegra186-camera-ivc-protocol-dbg",
|
||
|
|
.data = (void *)"camchar-dbg", },
|
||
|
|
{ },
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct tegra_ivc_driver camchar_driver = {
|
||
|
|
.driver = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.bus = &tegra_ivc_bus_type,
|
||
|
|
.name = "tegra-ivc-cdev",
|
||
|
|
.of_match_table = camchar_of_match,
|
||
|
|
},
|
||
|
|
.dev_type = &tegra_ivc_channel_type,
|
||
|
|
.ops.channel = &tegra_ivc_channel_chardev_ops,
|
||
|
|
};
|
||
|
|
|
||
|
|
tegra_ivc_subsys_driver(camchar_driver, tegra_camchar_init, tegra_camchar_exit);
|
||
|
|
MODULE_AUTHOR("Jan Solanti <jsolanti@nvidia.com>");
|
||
|
|
MODULE_DESCRIPTION("The character device for ivc-bus");
|
||
|
|
MODULE_LICENSE("GPL v2");
|