374 lines
8.3 KiB
C
374 lines
8.3 KiB
C
/*
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* SCR24x PCMCIA Smart Card Reader Driver
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*
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* Copyright (C) 2005-2006 TL Sudheendran
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* Copyright (C) 2016 Lubomir Rintel
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*
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* Derived from "scr24x_v4.2.6_Release.tar.gz" driver by TL Sudheendran.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for 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; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <pcmcia/cistpl.h>
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#include <pcmcia/ds.h>
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#define CCID_HEADER_SIZE 10
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#define CCID_LENGTH_OFFSET 1
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#define CCID_MAX_LEN 271
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#define SCR24X_DATA(n) (1 + n)
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#define SCR24X_CMD_STATUS 7
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#define CMD_START 0x40
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#define CMD_WRITE_BYTE 0x41
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#define CMD_READ_BYTE 0x42
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#define STATUS_BUSY 0x80
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struct scr24x_dev {
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struct device *dev;
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struct cdev c_dev;
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unsigned char buf[CCID_MAX_LEN];
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int devno;
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struct mutex lock;
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struct kref refcnt;
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u8 __iomem *regs;
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};
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#define SCR24X_DEVS 8
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static DECLARE_BITMAP(scr24x_minors, SCR24X_DEVS);
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static struct class *scr24x_class;
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static dev_t scr24x_devt;
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static void scr24x_delete(struct kref *kref)
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{
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struct scr24x_dev *dev = container_of(kref, struct scr24x_dev,
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refcnt);
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kfree(dev);
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}
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static int scr24x_wait_ready(struct scr24x_dev *dev)
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{
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u_char status;
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int timeout = 100;
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do {
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status = ioread8(dev->regs + SCR24X_CMD_STATUS);
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if (!(status & STATUS_BUSY))
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return 0;
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msleep(20);
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} while (--timeout);
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return -EIO;
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}
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static int scr24x_open(struct inode *inode, struct file *filp)
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{
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struct scr24x_dev *dev = container_of(inode->i_cdev,
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struct scr24x_dev, c_dev);
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kref_get(&dev->refcnt);
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filp->private_data = dev;
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return nonseekable_open(inode, filp);
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}
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static int scr24x_release(struct inode *inode, struct file *filp)
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{
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struct scr24x_dev *dev = filp->private_data;
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/* We must not take the dev->lock here as scr24x_delete()
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* might be called to remove the dev structure altogether.
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* We don't need the lock anyway, since after the reference
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* acquired in probe() is released in remove() the chrdev
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* is already unregistered and noone can possibly acquire
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* a reference via open() anymore. */
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kref_put(&dev->refcnt, scr24x_delete);
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return 0;
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}
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static int read_chunk(struct scr24x_dev *dev, size_t offset, size_t limit)
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{
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size_t i, y;
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int ret;
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for (i = offset; i < limit; i += 5) {
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iowrite8(CMD_READ_BYTE, dev->regs + SCR24X_CMD_STATUS);
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ret = scr24x_wait_ready(dev);
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if (ret < 0)
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return ret;
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for (y = 0; y < 5 && i + y < limit; y++)
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dev->buf[i + y] = ioread8(dev->regs + SCR24X_DATA(y));
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}
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return 0;
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}
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static ssize_t scr24x_read(struct file *filp, char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct scr24x_dev *dev = filp->private_data;
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int ret;
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int len;
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if (count < CCID_HEADER_SIZE)
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return -EINVAL;
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if (mutex_lock_interruptible(&dev->lock))
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return -ERESTARTSYS;
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if (!dev->dev) {
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ret = -ENODEV;
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goto out;
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}
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ret = scr24x_wait_ready(dev);
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if (ret < 0)
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goto out;
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len = CCID_HEADER_SIZE;
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ret = read_chunk(dev, 0, len);
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if (ret < 0)
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goto out;
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len += le32_to_cpu(*(__le32 *)(&dev->buf[CCID_LENGTH_OFFSET]));
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if (len > sizeof(dev->buf)) {
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ret = -EIO;
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goto out;
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}
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ret = read_chunk(dev, CCID_HEADER_SIZE, len);
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if (ret < 0)
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goto out;
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if (len < count)
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count = len;
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if (copy_to_user(buf, dev->buf, count)) {
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ret = -EFAULT;
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goto out;
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}
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ret = count;
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out:
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mutex_unlock(&dev->lock);
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return ret;
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}
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static ssize_t scr24x_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct scr24x_dev *dev = filp->private_data;
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size_t i, y;
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int ret;
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if (mutex_lock_interruptible(&dev->lock))
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return -ERESTARTSYS;
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if (!dev->dev) {
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ret = -ENODEV;
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goto out;
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}
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if (count > sizeof(dev->buf)) {
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ret = -EINVAL;
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goto out;
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}
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if (copy_from_user(dev->buf, buf, count)) {
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ret = -EFAULT;
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goto out;
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}
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ret = scr24x_wait_ready(dev);
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if (ret < 0)
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goto out;
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iowrite8(CMD_START, dev->regs + SCR24X_CMD_STATUS);
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ret = scr24x_wait_ready(dev);
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if (ret < 0)
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goto out;
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for (i = 0; i < count; i += 5) {
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for (y = 0; y < 5 && i + y < count; y++)
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iowrite8(dev->buf[i + y], dev->regs + SCR24X_DATA(y));
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iowrite8(CMD_WRITE_BYTE, dev->regs + SCR24X_CMD_STATUS);
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ret = scr24x_wait_ready(dev);
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if (ret < 0)
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goto out;
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}
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ret = count;
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out:
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mutex_unlock(&dev->lock);
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return ret;
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}
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static const struct file_operations scr24x_fops = {
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.owner = THIS_MODULE,
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.read = scr24x_read,
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.write = scr24x_write,
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.open = scr24x_open,
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.release = scr24x_release,
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.llseek = no_llseek,
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};
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static int scr24x_config_check(struct pcmcia_device *link, void *priv_data)
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{
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if (resource_size(link->resource[PCMCIA_IOPORT_0]) != 0x11)
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return -ENODEV;
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return pcmcia_request_io(link);
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}
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static int scr24x_probe(struct pcmcia_device *link)
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{
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struct scr24x_dev *dev;
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int ret;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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dev->devno = find_first_zero_bit(scr24x_minors, SCR24X_DEVS);
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if (dev->devno >= SCR24X_DEVS) {
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ret = -EBUSY;
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goto err;
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}
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mutex_init(&dev->lock);
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kref_init(&dev->refcnt);
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link->priv = dev;
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link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
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ret = pcmcia_loop_config(link, scr24x_config_check, NULL);
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if (ret < 0)
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goto err;
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dev->dev = &link->dev;
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dev->regs = devm_ioport_map(&link->dev,
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link->resource[PCMCIA_IOPORT_0]->start,
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resource_size(link->resource[PCMCIA_IOPORT_0]));
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if (!dev->regs) {
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ret = -EIO;
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goto err;
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}
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cdev_init(&dev->c_dev, &scr24x_fops);
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dev->c_dev.owner = THIS_MODULE;
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dev->c_dev.ops = &scr24x_fops;
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ret = cdev_add(&dev->c_dev, MKDEV(MAJOR(scr24x_devt), dev->devno), 1);
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if (ret < 0)
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goto err;
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ret = pcmcia_enable_device(link);
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if (ret < 0) {
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pcmcia_disable_device(link);
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goto err;
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}
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device_create(scr24x_class, NULL, MKDEV(MAJOR(scr24x_devt), dev->devno),
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NULL, "scr24x%d", dev->devno);
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dev_info(&link->dev, "SCR24x Chip Card Interface\n");
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return 0;
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err:
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if (dev->devno < SCR24X_DEVS)
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clear_bit(dev->devno, scr24x_minors);
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kfree (dev);
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return ret;
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}
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static void scr24x_remove(struct pcmcia_device *link)
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{
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struct scr24x_dev *dev = (struct scr24x_dev *)link->priv;
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device_destroy(scr24x_class, MKDEV(MAJOR(scr24x_devt), dev->devno));
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mutex_lock(&dev->lock);
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pcmcia_disable_device(link);
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cdev_del(&dev->c_dev);
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clear_bit(dev->devno, scr24x_minors);
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dev->dev = NULL;
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mutex_unlock(&dev->lock);
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kref_put(&dev->refcnt, scr24x_delete);
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}
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static const struct pcmcia_device_id scr24x_ids[] = {
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PCMCIA_DEVICE_PROD_ID12("HP", "PC Card Smart Card Reader",
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0x53cb94f9, 0xbfdf89a5),
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PCMCIA_DEVICE_PROD_ID1("SCR241 PCMCIA", 0x6271efa3),
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PCMCIA_DEVICE_PROD_ID1("SCR243 PCMCIA", 0x2054e8de),
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PCMCIA_DEVICE_PROD_ID1("SCR24x PCMCIA", 0x54a33665),
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PCMCIA_DEVICE_NULL
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};
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MODULE_DEVICE_TABLE(pcmcia, scr24x_ids);
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static struct pcmcia_driver scr24x_driver = {
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.owner = THIS_MODULE,
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.name = "scr24x_cs",
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.probe = scr24x_probe,
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.remove = scr24x_remove,
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.id_table = scr24x_ids,
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};
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static int __init scr24x_init(void)
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{
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int ret;
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scr24x_class = class_create(THIS_MODULE, "scr24x");
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if (IS_ERR(scr24x_class))
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return PTR_ERR(scr24x_class);
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ret = alloc_chrdev_region(&scr24x_devt, 0, SCR24X_DEVS, "scr24x");
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if (ret < 0) {
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class_destroy(scr24x_class);
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return ret;
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}
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ret = pcmcia_register_driver(&scr24x_driver);
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if (ret < 0) {
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unregister_chrdev_region(scr24x_devt, SCR24X_DEVS);
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class_destroy(scr24x_class);
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}
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return ret;
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}
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static void __exit scr24x_exit(void)
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{
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pcmcia_unregister_driver(&scr24x_driver);
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unregister_chrdev_region(scr24x_devt, SCR24X_DEVS);
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class_destroy(scr24x_class);
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}
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module_init(scr24x_init);
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module_exit(scr24x_exit);
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MODULE_AUTHOR("Lubomir Rintel");
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MODULE_DESCRIPTION("SCR24x PCMCIA Smart Card Reader Driver");
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MODULE_LICENSE("GPL");
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