diff options
Diffstat (limited to 'drivers/fmc/fmc-chardev.c')
| -rw-r--r-- | drivers/fmc/fmc-chardev.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/drivers/fmc/fmc-chardev.c b/drivers/fmc/fmc-chardev.c deleted file mode 100644 index 7d2091b5e978..000000000000 --- a/drivers/fmc/fmc-chardev.c +++ /dev/null @@ -1,199 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2012 CERN (www.cern.ch) - * Author: Alessandro Rubini <rubini@gnudd.com> - * - * This work is part of the White Rabbit project, a research effort led - * by CERN, the European Institute for Nuclear Research. - */ -#include <linux/module.h> -#include <linux/init.h> -#include <linux/list.h> -#include <linux/slab.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> -#include <linux/spinlock.h> -#include <linux/fmc.h> -#include <linux/uaccess.h> - -static LIST_HEAD(fc_devices); -static DEFINE_SPINLOCK(fc_lock); - -struct fc_instance { - struct list_head list; - struct fmc_device *fmc; - struct miscdevice misc; -}; - -/* at open time, we must identify our device */ -static int fc_open(struct inode *ino, struct file *f) -{ - struct fmc_device *fmc; - struct fc_instance *fc; - int minor = iminor(ino); - - list_for_each_entry(fc, &fc_devices, list) - if (fc->misc.minor == minor) - break; - if (fc->misc.minor != minor) - return -ENODEV; - fmc = fc->fmc; - if (try_module_get(fmc->owner) == 0) - return -ENODEV; - - f->private_data = fmc; - return 0; -} - -static int fc_release(struct inode *ino, struct file *f) -{ - struct fmc_device *fmc = f->private_data; - module_put(fmc->owner); - return 0; -} - -/* read and write are simple after the default llseek has been used */ -static ssize_t fc_read(struct file *f, char __user *buf, size_t count, - loff_t *offp) -{ - struct fmc_device *fmc = f->private_data; - unsigned long addr; - uint32_t val; - - if (count < sizeof(val)) - return -EINVAL; - count = sizeof(val); - - addr = *offp; - if (addr > fmc->memlen) - return -ESPIPE; /* Illegal seek */ - val = fmc_readl(fmc, addr); - if (copy_to_user(buf, &val, count)) - return -EFAULT; - *offp += count; - return count; -} - -static ssize_t fc_write(struct file *f, const char __user *buf, size_t count, - loff_t *offp) -{ - struct fmc_device *fmc = f->private_data; - unsigned long addr; - uint32_t val; - - if (count < sizeof(val)) - return -EINVAL; - count = sizeof(val); - - addr = *offp; - if (addr > fmc->memlen) - return -ESPIPE; /* Illegal seek */ - if (copy_from_user(&val, buf, count)) - return -EFAULT; - fmc_writel(fmc, val, addr); - *offp += count; - return count; -} - -static const struct file_operations fc_fops = { - .owner = THIS_MODULE, - .open = fc_open, - .release = fc_release, - .llseek = generic_file_llseek, - .read = fc_read, - .write = fc_write, -}; - - -/* Device part .. */ -static int fc_probe(struct fmc_device *fmc); -static int fc_remove(struct fmc_device *fmc); - -static struct fmc_driver fc_drv = { - .version = FMC_VERSION, - .driver.name = KBUILD_MODNAME, - .probe = fc_probe, - .remove = fc_remove, - /* no table: we want to match everything */ -}; - -/* We accept the generic busid parameter */ -FMC_PARAM_BUSID(fc_drv); - -/* probe and remove must allocate and release a misc device */ -static int fc_probe(struct fmc_device *fmc) -{ - int ret; - int index = 0; - - struct fc_instance *fc; - - index = fmc_validate(fmc, &fc_drv); - if (index < 0) - return -EINVAL; /* not our device: invalid */ - - /* Create a char device: we want to create it anew */ - fc = kzalloc(sizeof(*fc), GFP_KERNEL); - if (!fc) - return -ENOMEM; - fc->fmc = fmc; - fc->misc.minor = MISC_DYNAMIC_MINOR; - fc->misc.fops = &fc_fops; - fc->misc.name = kstrdup(dev_name(&fmc->dev), GFP_KERNEL); - - ret = misc_register(&fc->misc); - if (ret < 0) - goto out; - spin_lock(&fc_lock); - list_add(&fc->list, &fc_devices); - spin_unlock(&fc_lock); - dev_info(&fc->fmc->dev, "Created misc device \"%s\"\n", - fc->misc.name); - return 0; - -out: - kfree(fc->misc.name); - kfree(fc); - return ret; -} - -static int fc_remove(struct fmc_device *fmc) -{ - struct fc_instance *fc; - - list_for_each_entry(fc, &fc_devices, list) - if (fc->fmc == fmc) - break; - if (fc->fmc != fmc) { - dev_err(&fmc->dev, "remove called but not found\n"); - return -ENODEV; - } - - spin_lock(&fc_lock); - list_del(&fc->list); - spin_unlock(&fc_lock); - misc_deregister(&fc->misc); - kfree(fc->misc.name); - kfree(fc); - - return 0; -} - - -static int fc_init(void) -{ - int ret; - - ret = fmc_driver_register(&fc_drv); - return ret; -} - -static void fc_exit(void) -{ - fmc_driver_unregister(&fc_drv); -} - -module_init(fc_init); -module_exit(fc_exit); - -MODULE_LICENSE("GPL"); |