diff options
Diffstat (limited to 'recipes-kernel/aim-cdev/files')
| -rw-r--r-- | recipes-kernel/aim-cdev/files/COPYING | 340 | ||||
| -rw-r--r-- | recipes-kernel/aim-cdev/files/Makefile | 18 | ||||
| -rw-r--r-- | recipes-kernel/aim-cdev/files/cdev.c | 550 |
3 files changed, 0 insertions, 908 deletions
diff --git a/recipes-kernel/aim-cdev/files/COPYING b/recipes-kernel/aim-cdev/files/COPYING deleted file mode 100644 index 6d45519c8..000000000 --- a/recipes-kernel/aim-cdev/files/COPYING +++ /dev/null @@ -1,340 +0,0 @@ - GNU GENERAL PUBLIC LICENSE - Version 2, June 1991 - - Copyright (C) 1989, 1991 Free Software Foundation, Inc. - 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. - - Preamble - - The licenses for most software are designed to take away your -freedom to share and change it. By contrast, the GNU General Public -License is intended to guarantee your freedom to share and change free -software--to make sure the software is free for all its users. This -General Public License applies to most of the Free Software -Foundation's software and to any other program whose authors commit to -using it. 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If this is what you want to do, use the GNU Library General -Public License instead of this License. diff --git a/recipes-kernel/aim-cdev/files/Makefile b/recipes-kernel/aim-cdev/files/Makefile deleted file mode 100644 index 05853c266..000000000 --- a/recipes-kernel/aim-cdev/files/Makefile +++ /dev/null @@ -1,18 +0,0 @@ -# Makefile -# - -SRC := $(shell pwd) - -obj-m += aim_cdev.o -aim_cdev-y := cdev.o -CFLAGS_cdev.o := -I$(src)/../../mostcore/files/ - -all: - $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules - -modules_install: - $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install - -clean: - $(MAKE) -C $(KERNEL_SRC) M=$(SRC) clean - diff --git a/recipes-kernel/aim-cdev/files/cdev.c b/recipes-kernel/aim-cdev/files/cdev.c deleted file mode 100644 index 3a2dbf149..000000000 --- a/recipes-kernel/aim-cdev/files/cdev.c +++ /dev/null @@ -1,550 +0,0 @@ -/* - * cdev.c - Application interfacing module for character devices - * - * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG - * - * 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. - * - * This file is licensed under GPLv2. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/fs.h> -#include <linux/slab.h> -#include <linux/device.h> -#include <linux/cdev.h> -#include <linux/poll.h> -#include <linux/kfifo.h> -#include <linux/uaccess.h> -#include <linux/idr.h> -#include "mostcore.h" - -static dev_t aim_devno; -static struct class *aim_class; -static struct ida minor_id; -static unsigned int major; -static struct most_aim cdev_aim; - -struct aim_channel { - wait_queue_head_t wq; - spinlock_t unlink; /* synchronization lock to unlink channels */ - struct cdev cdev; - struct device *dev; - struct mutex io_mutex; - struct most_interface *iface; - struct most_channel_config *cfg; - unsigned int channel_id; - dev_t devno; - size_t mbo_offs; - DECLARE_KFIFO_PTR(fifo, typeof(struct mbo *)); - int access_ref; - struct list_head list; -}; - -#define to_channel(d) container_of(d, struct aim_channel, cdev) -static struct list_head channel_list; -static spinlock_t ch_list_lock; - -static inline bool ch_has_mbo(struct aim_channel *c) -{ - return channel_has_mbo(c->iface, c->channel_id, &cdev_aim) > 0; -} - -static inline bool ch_get_mbo(struct aim_channel *c, struct mbo **mbo) -{ - *mbo = most_get_mbo(c->iface, c->channel_id, &cdev_aim); - return *mbo; -} - -static struct aim_channel *get_channel(struct most_interface *iface, int id) -{ - struct aim_channel *c, *tmp; - unsigned long flags; - int found_channel = 0; - - spin_lock_irqsave(&ch_list_lock, flags); - list_for_each_entry_safe(c, tmp, &channel_list, list) { - if ((c->iface == iface) && (c->channel_id == id)) { - found_channel = 1; - break; - } - } - spin_unlock_irqrestore(&ch_list_lock, flags); - if (!found_channel) - return NULL; - return c; -} - -static void stop_channel(struct aim_channel *c) -{ - struct mbo *mbo; - - while (kfifo_out((struct kfifo *)&c->fifo, &mbo, 1)) - most_put_mbo(mbo); - most_stop_channel(c->iface, c->channel_id, &cdev_aim); -} - -static void destroy_cdev(struct aim_channel *c) -{ - unsigned long flags; - - device_destroy(aim_class, c->devno); - cdev_del(&c->cdev); - kfifo_free(&c->fifo); - spin_lock_irqsave(&ch_list_lock, flags); - list_del(&c->list); - spin_unlock_irqrestore(&ch_list_lock, flags); - ida_simple_remove(&minor_id, MINOR(c->devno)); -} - -/** - * aim_open - implements the syscall to open the device - * @inode: inode pointer - * @filp: file pointer - * - * This stores the channel pointer in the private data field of - * the file structure and activates the channel within the core. - */ -static int aim_open(struct inode *inode, struct file *filp) -{ - struct aim_channel *c; - int ret; - - c = to_channel(inode->i_cdev); - filp->private_data = c; - - if (((c->cfg->direction == MOST_CH_RX) && - ((filp->f_flags & O_ACCMODE) != O_RDONLY)) || - ((c->cfg->direction == MOST_CH_TX) && - ((filp->f_flags & O_ACCMODE) != O_WRONLY))) { - pr_info("WARN: Access flags mismatch\n"); - return -EACCES; - } - - mutex_lock(&c->io_mutex); - if (!c->dev) { - pr_info("WARN: Device is destroyed\n"); - mutex_unlock(&c->io_mutex); - return -EBUSY; - } - - if (c->access_ref) { - pr_info("WARN: Device is busy\n"); - mutex_unlock(&c->io_mutex); - return -EBUSY; - } - - c->mbo_offs = 0; - ret = most_start_channel(c->iface, c->channel_id, &cdev_aim); - if (!ret) - c->access_ref = 1; - mutex_unlock(&c->io_mutex); - return ret; -} - -/** - * aim_close - implements the syscall to close the device - * @inode: inode pointer - * @filp: file pointer - * - * This stops the channel within the core. - */ -static int aim_close(struct inode *inode, struct file *filp) -{ - struct aim_channel *c = to_channel(inode->i_cdev); - - mutex_lock(&c->io_mutex); - spin_lock(&c->unlink); - c->access_ref = 0; - spin_unlock(&c->unlink); - if (c->dev) { - stop_channel(c); - mutex_unlock(&c->io_mutex); - } else { - destroy_cdev(c); - mutex_unlock(&c->io_mutex); - kfree(c); - } - return 0; -} - -/** - * aim_write - implements the syscall to write to the device - * @filp: file pointer - * @buf: pointer to user buffer - * @count: number of bytes to write - * @offset: offset from where to start writing - */ -static ssize_t aim_write(struct file *filp, const char __user *buf, - size_t count, loff_t *offset) -{ - int ret; - size_t actual_len; - size_t max_len; - struct mbo *mbo = NULL; - struct aim_channel *c = filp->private_data; - - mutex_lock(&c->io_mutex); - while (c->dev && !ch_get_mbo(c, &mbo)) { - mutex_unlock(&c->io_mutex); - - if ((filp->f_flags & O_NONBLOCK)) - return -EAGAIN; - if (wait_event_interruptible(c->wq, ch_has_mbo(c) || !c->dev)) - return -ERESTARTSYS; - mutex_lock(&c->io_mutex); - } - - if (unlikely(!c->dev)) { - ret = -EPIPE; - goto unlock; - } - - max_len = c->cfg->buffer_size; - actual_len = min(count, max_len); - mbo->buffer_length = actual_len; - - if (copy_from_user(mbo->virt_address, buf, mbo->buffer_length)) { - ret = -EFAULT; - goto put_mbo; - } - - ret = most_submit_mbo(mbo); - if (ret) - goto put_mbo; - - mutex_unlock(&c->io_mutex); - return actual_len; -put_mbo: - most_put_mbo(mbo); -unlock: - mutex_unlock(&c->io_mutex); - return ret; -} - -/** - * aim_read - implements the syscall to read from the device - * @filp: file pointer - * @buf: pointer to user buffer - * @count: number of bytes to read - * @offset: offset from where to start reading - */ -static ssize_t -aim_read(struct file *filp, char __user *buf, size_t count, loff_t *offset) -{ - size_t to_copy, not_copied, copied; - struct mbo *mbo; - struct aim_channel *c = filp->private_data; - - mutex_lock(&c->io_mutex); - while (c->dev && !kfifo_peek(&c->fifo, &mbo)) { - mutex_unlock(&c->io_mutex); - if (filp->f_flags & O_NONBLOCK) - return -EAGAIN; - if (wait_event_interruptible(c->wq, - (!kfifo_is_empty(&c->fifo) || - (!c->dev)))) - return -ERESTARTSYS; - mutex_lock(&c->io_mutex); - } - - /* make sure we don't submit to gone devices */ - if (unlikely(!c->dev)) { - mutex_unlock(&c->io_mutex); - return -EIO; - } - - to_copy = min_t(size_t, - count, - mbo->processed_length - c->mbo_offs); - - not_copied = copy_to_user(buf, - mbo->virt_address + c->mbo_offs, - to_copy); - - copied = to_copy - not_copied; - - c->mbo_offs += copied; - if (c->mbo_offs >= mbo->processed_length) { - kfifo_skip(&c->fifo); - most_put_mbo(mbo); - c->mbo_offs = 0; - } - mutex_unlock(&c->io_mutex); - return copied; -} - -static unsigned int aim_poll(struct file *filp, poll_table *wait) -{ - struct aim_channel *c = filp->private_data; - unsigned int mask = 0; - - poll_wait(filp, &c->wq, wait); - - if (c->cfg->direction == MOST_CH_RX) { - if (!kfifo_is_empty(&c->fifo)) - mask |= POLLIN | POLLRDNORM; - } else { - if (ch_has_mbo(c)) - mask |= POLLOUT | POLLWRNORM; - } - return mask; -} - -/** - * Initialization of struct file_operations - */ -static const struct file_operations channel_fops = { - .owner = THIS_MODULE, - .read = aim_read, - .write = aim_write, - .open = aim_open, - .release = aim_close, - .poll = aim_poll, -}; - -/** - * aim_disconnect_channel - disconnect a channel - * @iface: pointer to interface instance - * @channel_id: channel index - * - * This frees allocated memory and removes the cdev that represents this - * channel in user space. - */ -static int aim_disconnect_channel(struct most_interface *iface, int channel_id) -{ - struct aim_channel *c; - - if (!iface) { - pr_info("Bad interface pointer\n"); - return -EINVAL; - } - - c = get_channel(iface, channel_id); - if (!c) - return -ENXIO; - - mutex_lock(&c->io_mutex); - spin_lock(&c->unlink); - c->dev = NULL; - spin_unlock(&c->unlink); - if (c->access_ref) { - stop_channel(c); - wake_up_interruptible(&c->wq); - mutex_unlock(&c->io_mutex); - } else { - destroy_cdev(c); - mutex_unlock(&c->io_mutex); - kfree(c); - } - return 0; -} - -/** - * aim_rx_completion - completion handler for rx channels - * @mbo: pointer to buffer object that has completed - * - * This searches for the channel linked to this MBO and stores it in the local - * fifo buffer. - */ -static int aim_rx_completion(struct mbo *mbo) -{ - struct aim_channel *c; - - if (!mbo) - return -EINVAL; - - c = get_channel(mbo->ifp, mbo->hdm_channel_id); - if (!c) - return -ENXIO; - - spin_lock(&c->unlink); - if (!c->access_ref || !c->dev) { - spin_unlock(&c->unlink); - return -EFAULT; - } - kfifo_in(&c->fifo, &mbo, 1); - spin_unlock(&c->unlink); -#ifdef DEBUG_MESG - if (kfifo_is_full(&c->fifo)) - pr_info("WARN: Fifo is full\n"); -#endif - wake_up_interruptible(&c->wq); - return 0; -} - -/** - * aim_tx_completion - completion handler for tx channels - * @iface: pointer to interface instance - * @channel_id: channel index/ID - * - * This wakes sleeping processes in the wait-queue. - */ -static int aim_tx_completion(struct most_interface *iface, int channel_id) -{ - struct aim_channel *c; - - if (!iface) { - pr_info("Bad interface pointer\n"); - return -EINVAL; - } - if ((channel_id < 0) || (channel_id >= iface->num_channels)) { - pr_info("Channel ID out of range\n"); - return -EINVAL; - } - - c = get_channel(iface, channel_id); - if (!c) - return -ENXIO; - wake_up_interruptible(&c->wq); - return 0; -} - -/** - * aim_probe - probe function of the driver module - * @iface: pointer to interface instance - * @channel_id: channel index/ID - * @cfg: pointer to actual channel configuration - * @parent: pointer to kobject (needed for sysfs hook-up) - * @name: name of the device to be created - * - * This allocates achannel object and creates the device node in /dev - * - * Returns 0 on success or error code otherwise. - */ -static int aim_probe(struct most_interface *iface, int channel_id, - struct most_channel_config *cfg, - struct kobject *parent, char *name) -{ - struct aim_channel *c; - unsigned long cl_flags; - int retval; - int current_minor; - - if ((!iface) || (!cfg) || (!parent) || (!name)) { - pr_info("Probing AIM with bad arguments"); - return -EINVAL; - } - c = get_channel(iface, channel_id); - if (c) - return -EEXIST; - - current_minor = ida_simple_get(&minor_id, 0, 0, GFP_KERNEL); - if (current_minor < 0) - return current_minor; - - c = kzalloc(sizeof(*c), GFP_KERNEL); - if (!c) { - retval = -ENOMEM; - goto error_alloc_channel; - } - - c->devno = MKDEV(major, current_minor); - cdev_init(&c->cdev, &channel_fops); - c->cdev.owner = THIS_MODULE; - cdev_add(&c->cdev, c->devno, 1); - c->iface = iface; - c->cfg = cfg; - c->channel_id = channel_id; - c->access_ref = 0; - spin_lock_init(&c->unlink); - INIT_KFIFO(c->fifo); - retval = kfifo_alloc(&c->fifo, cfg->num_buffers, GFP_KERNEL); - if (retval) { - pr_info("failed to alloc channel kfifo"); - goto error_alloc_kfifo; - } - init_waitqueue_head(&c->wq); - mutex_init(&c->io_mutex); - spin_lock_irqsave(&ch_list_lock, cl_flags); - list_add_tail(&c->list, &channel_list); - spin_unlock_irqrestore(&ch_list_lock, cl_flags); - c->dev = device_create(aim_class, - NULL, - c->devno, - NULL, - "%s", name); - - retval = IS_ERR(c->dev); - if (retval) { - pr_info("failed to create new device node %s\n", name); - goto error_create_device; - } - kobject_uevent(&c->dev->kobj, KOBJ_ADD); - return 0; - -error_create_device: - kfifo_free(&c->fifo); - list_del(&c->list); -error_alloc_kfifo: - cdev_del(&c->cdev); - kfree(c); -error_alloc_channel: - ida_simple_remove(&minor_id, current_minor); - return retval; -} - -static struct most_aim cdev_aim = { - .name = "cdev", - .probe_channel = aim_probe, - .disconnect_channel = aim_disconnect_channel, - .rx_completion = aim_rx_completion, - .tx_completion = aim_tx_completion, -}; - -static int __init mod_init(void) -{ - pr_info("init()\n"); - - INIT_LIST_HEAD(&channel_list); - spin_lock_init(&ch_list_lock); - ida_init(&minor_id); - - if (alloc_chrdev_region(&aim_devno, 0, 50, "cdev") < 0) - return -EIO; - major = MAJOR(aim_devno); - - aim_class = class_create(THIS_MODULE, "most_cdev_aim"); - if (IS_ERR(aim_class)) { - pr_err("no udev support\n"); - goto free_cdev; - } - - if (most_register_aim(&cdev_aim)) - goto dest_class; - return 0; - -dest_class: - class_destroy(aim_class); -free_cdev: - unregister_chrdev_region(aim_devno, 1); - return -EIO; -} - -static void __exit mod_exit(void) -{ - struct aim_channel *c, *tmp; - - pr_info("exit module\n"); - - most_deregister_aim(&cdev_aim); - - list_for_each_entry_safe(c, tmp, &channel_list, list) { - destroy_cdev(c); - kfree(c); - } - class_destroy(aim_class); - unregister_chrdev_region(aim_devno, 1); - ida_destroy(&minor_id); -} - -module_init(mod_init); -module_exit(mod_exit); -MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>"); -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("character device AIM for mostcore"); |