--- /dev/null
+/*
+ * SCR24x PCMCIA Smart Card Reader Driver
+ *
+ * Copyright (C) 2005-2006 TL Sudheendran
+ * Copyright (C) 2016 Lubomir Rintel
+ *
+ * Derived from "scr24x_v4.2.6_Release.tar.gz" driver by TL Sudheendran.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/cdev.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+
+#define CCID_HEADER_SIZE 10
+#define CCID_LENGTH_OFFSET 1
+#define CCID_MAX_LEN 271
+
+#define SCR24X_DATA(n) (1 + n)
+#define SCR24X_CMD_STATUS 7
+#define CMD_START 0x40
+#define CMD_WRITE_BYTE 0x41
+#define CMD_READ_BYTE 0x42
+#define STATUS_BUSY 0x80
+
+struct scr24x_dev {
+ struct device *dev;
+ struct cdev c_dev;
+ unsigned char buf[CCID_MAX_LEN];
+ int devno;
+ struct mutex lock;
+ struct kref refcnt;
+ u8 __iomem *regs;
+};
+
+#define SCR24X_DEVS 8
+static DECLARE_BITMAP(scr24x_minors, SCR24X_DEVS);
+
+static struct class *scr24x_class;
+static dev_t scr24x_devt;
+
+static void scr24x_delete(struct kref *kref)
+{
+ struct scr24x_dev *dev = container_of(kref, struct scr24x_dev,
+ refcnt);
+
+ kfree(dev);
+}
+
+static int scr24x_wait_ready(struct scr24x_dev *dev)
+{
+ u_char status;
+ int timeout = 100;
+
+ do {
+ status = ioread8(dev->regs + SCR24X_CMD_STATUS);
+ if (!(status & STATUS_BUSY))
+ return 0;
+
+ msleep(20);
+ } while (--timeout);
+
+ return -EIO;
+}
+
+static int scr24x_open(struct inode *inode, struct file *filp)
+{
+ struct scr24x_dev *dev = container_of(inode->i_cdev,
+ struct scr24x_dev, c_dev);
+
+ kref_get(&dev->refcnt);
+ filp->private_data = dev;
+
+ return nonseekable_open(inode, filp);
+}
+
+static int scr24x_release(struct inode *inode, struct file *filp)
+{
+ struct scr24x_dev *dev = filp->private_data;
+
+ /* We must not take the dev->lock here as scr24x_delete()
+ * might be called to remove the dev structure altogether.
+ * We don't need the lock anyway, since after the reference
+ * acquired in probe() is released in remove() the chrdev
+ * is already unregistered and noone can possibly acquire
+ * a reference via open() anymore. */
+ kref_put(&dev->refcnt, scr24x_delete);
+ return 0;
+}
+
+static int read_chunk(struct scr24x_dev *dev, size_t offset, size_t limit)
+{
+ size_t i, y;
+ int ret;
+
+ for (i = offset; i < limit; i += 5) {
+ iowrite8(CMD_READ_BYTE, dev->regs + SCR24X_CMD_STATUS);
+ ret = scr24x_wait_ready(dev);
+ if (ret < 0)
+ return ret;
+
+ for (y = 0; y < 5 && i + y < limit; y++)
+ dev->buf[i + y] = ioread8(dev->regs + SCR24X_DATA(y));
+ }
+
+ return 0;
+}
+
+static ssize_t scr24x_read(struct file *filp, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct scr24x_dev *dev = filp->private_data;
+ int ret;
+ int len;
+
+ if (count < CCID_HEADER_SIZE)
+ return -EINVAL;
+
+ if (mutex_lock_interruptible(&dev->lock))
+ return -ERESTARTSYS;
+
+ if (!dev->dev) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ ret = scr24x_wait_ready(dev);
+ if (ret < 0)
+ goto out;
+ len = CCID_HEADER_SIZE;
+ ret = read_chunk(dev, 0, len);
+ if (ret < 0)
+ goto out;
+
+ len += le32_to_cpu(*(__le32 *)(&dev->buf[CCID_LENGTH_OFFSET]));
+ if (len > sizeof(dev->buf)) {
+ ret = -EIO;
+ goto out;
+ }
+ read_chunk(dev, CCID_HEADER_SIZE, len);
+ if (ret < 0)
+ goto out;
+
+ if (len < count)
+ count = len;
+
+ if (copy_to_user(buf, dev->buf, count)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = count;
+out:
+ mutex_unlock(&dev->lock);
+ return ret;
+}
+
+static ssize_t scr24x_write(struct file *filp, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct scr24x_dev *dev = filp->private_data;
+ size_t i, y;
+ int ret;
+
+ if (mutex_lock_interruptible(&dev->lock))
+ return -ERESTARTSYS;
+
+ if (!dev->dev) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (count > sizeof(dev->buf)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (copy_from_user(dev->buf, buf, count)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = scr24x_wait_ready(dev);
+ if (ret < 0)
+ goto out;
+
+ iowrite8(CMD_START, dev->regs + SCR24X_CMD_STATUS);
+ ret = scr24x_wait_ready(dev);
+ if (ret < 0)
+ goto out;
+
+ for (i = 0; i < count; i += 5) {
+ for (y = 0; y < 5 && i + y < count; y++)
+ iowrite8(dev->buf[i + y], dev->regs + SCR24X_DATA(y));
+
+ iowrite8(CMD_WRITE_BYTE, dev->regs + SCR24X_CMD_STATUS);
+ ret = scr24x_wait_ready(dev);
+ if (ret < 0)
+ goto out;
+ }
+
+ ret = count;
+out:
+ mutex_unlock(&dev->lock);
+ return ret;
+}
+
+static const struct file_operations scr24x_fops = {
+ .owner = THIS_MODULE,
+ .read = scr24x_read,
+ .write = scr24x_write,
+ .open = scr24x_open,
+ .release = scr24x_release,
+ .llseek = no_llseek,
+};
+
+static int scr24x_config_check(struct pcmcia_device *link, void *priv_data)
+{
+ if (resource_size(link->resource[PCMCIA_IOPORT_0]) != 0x11)
+ return -ENODEV;
+ return pcmcia_request_io(link);
+}
+
+static int scr24x_probe(struct pcmcia_device *link)
+{
+ struct scr24x_dev *dev;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->devno = find_first_zero_bit(scr24x_minors, SCR24X_DEVS);
+ if (dev->devno >= SCR24X_DEVS) {
+ ret = -EBUSY;
+ goto err;
+ }
+
+ mutex_init(&dev->lock);
+ kref_init(&dev->refcnt);
+
+ link->priv = dev;
+ link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
+
+ ret = pcmcia_loop_config(link, scr24x_config_check, NULL);
+ if (ret < 0)
+ goto err;
+
+ dev->dev = &link->dev;
+ dev->regs = devm_ioport_map(&link->dev,
+ link->resource[PCMCIA_IOPORT_0]->start,
+ resource_size(link->resource[PCMCIA_IOPORT_0]));
+ if (!dev->regs) {
+ ret = -EIO;
+ goto err;
+ }
+
+ cdev_init(&dev->c_dev, &scr24x_fops);
+ dev->c_dev.owner = THIS_MODULE;
+ dev->c_dev.ops = &scr24x_fops;
+ ret = cdev_add(&dev->c_dev, MKDEV(MAJOR(scr24x_devt), dev->devno), 1);
+ if (ret < 0)
+ goto err;
+
+ ret = pcmcia_enable_device(link);
+ if (ret < 0) {
+ pcmcia_disable_device(link);
+ goto err;
+ }
+
+ device_create(scr24x_class, NULL, MKDEV(MAJOR(scr24x_devt), dev->devno),
+ NULL, "scr24x%d", dev->devno);
+
+ dev_info(&link->dev, "SCR24x Chip Card Interface\n");
+ return 0;
+
+err:
+ if (dev->devno < SCR24X_DEVS)
+ clear_bit(dev->devno, scr24x_minors);
+ kfree (dev);
+ return ret;
+}
+
+static void scr24x_remove(struct pcmcia_device *link)
+{
+ struct scr24x_dev *dev = (struct scr24x_dev *)link->priv;
+
+ device_destroy(scr24x_class, MKDEV(MAJOR(scr24x_devt), dev->devno));
+ mutex_lock(&dev->lock);
+ pcmcia_disable_device(link);
+ cdev_del(&dev->c_dev);
+ clear_bit(dev->devno, scr24x_minors);
+ dev->dev = NULL;
+ mutex_unlock(&dev->lock);
+
+ kref_put(&dev->refcnt, scr24x_delete);
+}
+
+static const struct pcmcia_device_id scr24x_ids[] = {
+ PCMCIA_DEVICE_PROD_ID12("HP", "PC Card Smart Card Reader",
+ 0x53cb94f9, 0xbfdf89a5),
+ PCMCIA_DEVICE_PROD_ID1("SCR241 PCMCIA", 0x6271efa3),
+ PCMCIA_DEVICE_PROD_ID1("SCR243 PCMCIA", 0x2054e8de),
+ PCMCIA_DEVICE_PROD_ID1("SCR24x PCMCIA", 0x54a33665),
+ PCMCIA_DEVICE_NULL
+};
+MODULE_DEVICE_TABLE(pcmcia, scr24x_ids);
+
+static struct pcmcia_driver scr24x_driver = {
+ .owner = THIS_MODULE,
+ .name = "scr24x_cs",
+ .probe = scr24x_probe,
+ .remove = scr24x_remove,
+ .id_table = scr24x_ids,
+};
+
+static int __init scr24x_init(void)
+{
+ int ret;
+
+ scr24x_class = class_create(THIS_MODULE, "scr24x");
+ if (IS_ERR(scr24x_class))
+ return PTR_ERR(scr24x_class);
+
+ ret = alloc_chrdev_region(&scr24x_devt, 0, SCR24X_DEVS, "scr24x");
+ if (ret < 0) {
+ class_destroy(scr24x_class);
+ return ret;
+ }
+
+ ret = pcmcia_register_driver(&scr24x_driver);
+ if (ret < 0) {
+ unregister_chrdev_region(scr24x_devt, SCR24X_DEVS);
+ class_destroy(scr24x_class);
+ }
+
+ return ret;
+}
+
+static void __exit scr24x_exit(void)
+{
+ pcmcia_unregister_driver(&scr24x_driver);
+ unregister_chrdev_region(scr24x_devt, SCR24X_DEVS);
+ class_destroy(scr24x_class);
+}
+
+module_init(scr24x_init);
+module_exit(scr24x_exit);
+
+MODULE_AUTHOR("Lubomir Rintel");
+MODULE_DESCRIPTION("SCR24x PCMCIA Smart Card Reader Driver");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff