685 lines
15 KiB
C
685 lines
15 KiB
C
/*
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* A driver for the Omnikey PCMCIA smartcard reader CardMan 4040
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*
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* (c) 2000-2004 Omnikey AG (http://www.omnikey.com/)
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*
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* (C) 2005-2006 Harald Welte <laforge@gnumonks.org>
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* - add support for poll()
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* - driver cleanup
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* - add waitqueues
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* - adhere to linux kernel coding style and policies
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* - support 2.6.13 "new style" pcmcia interface
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* - add class interface for udev device creation
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*
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* The device basically is a USB CCID compliant device that has been
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* attached to an I/O-Mapped FIFO.
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*
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* All rights reserved, Dual BSD/GPL Licensed.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/wait.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <pcmcia/cistpl.h>
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#include <pcmcia/cisreg.h>
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#include <pcmcia/ciscode.h>
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#include <pcmcia/ds.h>
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#include "cm4040_cs.h"
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#define reader_to_dev(x) (&x->p_dev->dev)
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/* n (debug level) is ignored */
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/* additional debug output may be enabled by re-compiling with
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* CM4040_DEBUG set */
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/* #define CM4040_DEBUG */
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#define DEBUGP(n, rdr, x, args...) do { \
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dev_dbg(reader_to_dev(rdr), "%s:" x, \
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__func__ , ## args); \
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} while (0)
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static DEFINE_MUTEX(cm4040_mutex);
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#define CCID_DRIVER_BULK_DEFAULT_TIMEOUT (150*HZ)
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#define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT (35*HZ)
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#define CCID_DRIVER_MINIMUM_TIMEOUT (3*HZ)
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#define READ_WRITE_BUFFER_SIZE 512
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#define POLL_LOOP_COUNT 1000
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/* how often to poll for fifo status change */
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#define POLL_PERIOD msecs_to_jiffies(10)
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static void reader_release(struct pcmcia_device *link);
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static int major;
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static struct class *cmx_class;
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#define BS_READABLE 0x01
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#define BS_WRITABLE 0x02
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struct reader_dev {
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struct pcmcia_device *p_dev;
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wait_queue_head_t devq;
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wait_queue_head_t poll_wait;
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wait_queue_head_t read_wait;
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wait_queue_head_t write_wait;
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unsigned long buffer_status;
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unsigned long timeout;
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unsigned char s_buf[READ_WRITE_BUFFER_SIZE];
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unsigned char r_buf[READ_WRITE_BUFFER_SIZE];
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struct timer_list poll_timer;
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};
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static struct pcmcia_device *dev_table[CM_MAX_DEV];
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#ifndef CM4040_DEBUG
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#define xoutb outb
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#define xinb inb
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#else
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static inline void xoutb(unsigned char val, unsigned short port)
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{
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pr_debug("outb(val=%.2x,port=%.4x)\n", val, port);
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outb(val, port);
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}
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static inline unsigned char xinb(unsigned short port)
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{
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unsigned char val;
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val = inb(port);
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pr_debug("%.2x=inb(%.4x)\n", val, port);
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return val;
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}
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#endif
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/* poll the device fifo status register. not to be confused with
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* the poll syscall. */
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static void cm4040_do_poll(struct timer_list *t)
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{
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struct reader_dev *dev = from_timer(dev, t, poll_timer);
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unsigned int obs = xinb(dev->p_dev->resource[0]->start
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+ REG_OFFSET_BUFFER_STATUS);
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if ((obs & BSR_BULK_IN_FULL)) {
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set_bit(BS_READABLE, &dev->buffer_status);
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DEBUGP(4, dev, "waking up read_wait\n");
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wake_up_interruptible(&dev->read_wait);
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} else
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clear_bit(BS_READABLE, &dev->buffer_status);
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if (!(obs & BSR_BULK_OUT_FULL)) {
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set_bit(BS_WRITABLE, &dev->buffer_status);
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DEBUGP(4, dev, "waking up write_wait\n");
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wake_up_interruptible(&dev->write_wait);
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} else
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clear_bit(BS_WRITABLE, &dev->buffer_status);
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if (dev->buffer_status)
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wake_up_interruptible(&dev->poll_wait);
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mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
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}
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static void cm4040_stop_poll(struct reader_dev *dev)
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{
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del_timer_sync(&dev->poll_timer);
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}
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static int wait_for_bulk_out_ready(struct reader_dev *dev)
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{
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int i, rc;
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int iobase = dev->p_dev->resource[0]->start;
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for (i = 0; i < POLL_LOOP_COUNT; i++) {
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if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
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& BSR_BULK_OUT_FULL) == 0) {
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DEBUGP(4, dev, "BulkOut empty (i=%d)\n", i);
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return 1;
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}
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}
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DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
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dev->timeout);
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rc = wait_event_interruptible_timeout(dev->write_wait,
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test_and_clear_bit(BS_WRITABLE,
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&dev->buffer_status),
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dev->timeout);
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if (rc > 0)
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DEBUGP(4, dev, "woke up: BulkOut empty\n");
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else if (rc == 0)
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DEBUGP(4, dev, "woke up: BulkOut full, returning 0 :(\n");
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else if (rc < 0)
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DEBUGP(4, dev, "woke up: signal arrived\n");
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return rc;
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}
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/* Write to Sync Control Register */
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static int write_sync_reg(unsigned char val, struct reader_dev *dev)
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{
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int iobase = dev->p_dev->resource[0]->start;
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int rc;
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rc = wait_for_bulk_out_ready(dev);
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if (rc <= 0)
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return rc;
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xoutb(val, iobase + REG_OFFSET_SYNC_CONTROL);
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rc = wait_for_bulk_out_ready(dev);
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if (rc <= 0)
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return rc;
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return 1;
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}
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static int wait_for_bulk_in_ready(struct reader_dev *dev)
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{
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int i, rc;
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int iobase = dev->p_dev->resource[0]->start;
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for (i = 0; i < POLL_LOOP_COUNT; i++) {
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if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
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& BSR_BULK_IN_FULL) == BSR_BULK_IN_FULL) {
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DEBUGP(3, dev, "BulkIn full (i=%d)\n", i);
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return 1;
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}
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}
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DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
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dev->timeout);
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rc = wait_event_interruptible_timeout(dev->read_wait,
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test_and_clear_bit(BS_READABLE,
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&dev->buffer_status),
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dev->timeout);
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if (rc > 0)
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DEBUGP(4, dev, "woke up: BulkIn full\n");
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else if (rc == 0)
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DEBUGP(4, dev, "woke up: BulkIn not full, returning 0 :(\n");
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else if (rc < 0)
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DEBUGP(4, dev, "woke up: signal arrived\n");
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return rc;
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}
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static ssize_t cm4040_read(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct reader_dev *dev = filp->private_data;
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int iobase = dev->p_dev->resource[0]->start;
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size_t bytes_to_read;
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unsigned long i;
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size_t min_bytes_to_read;
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int rc;
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DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
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if (count == 0)
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return 0;
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if (count < 10)
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return -EFAULT;
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if (filp->f_flags & O_NONBLOCK) {
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DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
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DEBUGP(2, dev, "<- cm4040_read (failure)\n");
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return -EAGAIN;
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}
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if (!pcmcia_dev_present(dev->p_dev))
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return -ENODEV;
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for (i = 0; i < 5; i++) {
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rc = wait_for_bulk_in_ready(dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
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DEBUGP(2, dev, "<- cm4040_read (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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return -EIO;
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}
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dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
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#ifdef CM4040_DEBUG
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pr_debug("%lu:%2x ", i, dev->r_buf[i]);
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}
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pr_debug("\n");
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#else
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}
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#endif
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bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);
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DEBUGP(6, dev, "BytesToRead=%zu\n", bytes_to_read);
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min_bytes_to_read = min(count, bytes_to_read + 5);
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min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
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DEBUGP(6, dev, "Min=%zu\n", min_bytes_to_read);
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for (i = 0; i < (min_bytes_to_read-5); i++) {
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rc = wait_for_bulk_in_ready(dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
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DEBUGP(2, dev, "<- cm4040_read (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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return -EIO;
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}
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dev->r_buf[i+5] = xinb(iobase + REG_OFFSET_BULK_IN);
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#ifdef CM4040_DEBUG
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pr_debug("%lu:%2x ", i, dev->r_buf[i]);
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}
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pr_debug("\n");
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#else
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}
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#endif
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*ppos = min_bytes_to_read;
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if (copy_to_user(buf, dev->r_buf, min_bytes_to_read))
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return -EFAULT;
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rc = wait_for_bulk_in_ready(dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
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DEBUGP(2, dev, "<- cm4040_read (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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return -EIO;
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}
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rc = write_sync_reg(SCR_READER_TO_HOST_DONE, dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "write_sync_reg c=%.2x\n", rc);
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DEBUGP(2, dev, "<- cm4040_read (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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else
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return -EIO;
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}
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xinb(iobase + REG_OFFSET_BULK_IN);
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DEBUGP(2, dev, "<- cm4040_read (successfully)\n");
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return min_bytes_to_read;
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}
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static ssize_t cm4040_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 reader_dev *dev = filp->private_data;
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int iobase = dev->p_dev->resource[0]->start;
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ssize_t rc;
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int i;
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unsigned int bytes_to_write;
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DEBUGP(2, dev, "-> cm4040_write(%s,%d)\n", current->comm, current->pid);
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if (count == 0) {
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DEBUGP(2, dev, "<- cm4040_write empty read (successfully)\n");
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return 0;
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}
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if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
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DEBUGP(2, dev, "<- cm4040_write buffersize=%zd < 5\n", count);
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return -EIO;
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}
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if (filp->f_flags & O_NONBLOCK) {
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DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
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DEBUGP(4, dev, "<- cm4040_write (failure)\n");
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return -EAGAIN;
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}
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if (!pcmcia_dev_present(dev->p_dev))
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return -ENODEV;
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bytes_to_write = count;
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if (copy_from_user(dev->s_buf, buf, bytes_to_write))
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return -EFAULT;
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switch (dev->s_buf[0]) {
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case CMD_PC_TO_RDR_XFRBLOCK:
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case CMD_PC_TO_RDR_SECURE:
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case CMD_PC_TO_RDR_TEST_SECURE:
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case CMD_PC_TO_RDR_OK_SECURE:
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dev->timeout = CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
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break;
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case CMD_PC_TO_RDR_ICCPOWERON:
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dev->timeout = CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
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break;
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case CMD_PC_TO_RDR_GETSLOTSTATUS:
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case CMD_PC_TO_RDR_ICCPOWEROFF:
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case CMD_PC_TO_RDR_GETPARAMETERS:
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case CMD_PC_TO_RDR_RESETPARAMETERS:
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case CMD_PC_TO_RDR_SETPARAMETERS:
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case CMD_PC_TO_RDR_ESCAPE:
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case CMD_PC_TO_RDR_ICCCLOCK:
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default:
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dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
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break;
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}
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rc = write_sync_reg(SCR_HOST_TO_READER_START, dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "write_sync_reg c=%.2zx\n", rc);
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DEBUGP(2, dev, "<- cm4040_write (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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else
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return -EIO;
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}
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DEBUGP(4, dev, "start \n");
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for (i = 0; i < bytes_to_write; i++) {
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rc = wait_for_bulk_out_ready(dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "wait_for_bulk_out_ready rc=%.2zx\n",
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rc);
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DEBUGP(2, dev, "<- cm4040_write (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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else
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return -EIO;
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}
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xoutb(dev->s_buf[i],iobase + REG_OFFSET_BULK_OUT);
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}
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DEBUGP(4, dev, "end\n");
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rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev);
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if (rc <= 0) {
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DEBUGP(5, dev, "write_sync_reg c=%.2zx\n", rc);
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DEBUGP(2, dev, "<- cm4040_write (failed)\n");
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if (rc == -ERESTARTSYS)
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return rc;
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else
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return -EIO;
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}
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DEBUGP(2, dev, "<- cm4040_write (successfully)\n");
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return count;
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}
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static __poll_t cm4040_poll(struct file *filp, poll_table *wait)
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{
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struct reader_dev *dev = filp->private_data;
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__poll_t mask = 0;
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poll_wait(filp, &dev->poll_wait, wait);
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if (test_and_clear_bit(BS_READABLE, &dev->buffer_status))
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mask |= EPOLLIN | EPOLLRDNORM;
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if (test_and_clear_bit(BS_WRITABLE, &dev->buffer_status))
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mask |= EPOLLOUT | EPOLLWRNORM;
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DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask);
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return mask;
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}
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static int cm4040_open(struct inode *inode, struct file *filp)
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{
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struct reader_dev *dev;
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struct pcmcia_device *link;
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int minor = iminor(inode);
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int ret;
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if (minor >= CM_MAX_DEV)
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return -ENODEV;
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mutex_lock(&cm4040_mutex);
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link = dev_table[minor];
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if (link == NULL || !pcmcia_dev_present(link)) {
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ret = -ENODEV;
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goto out;
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}
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if (link->open) {
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ret = -EBUSY;
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goto out;
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}
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dev = link->priv;
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filp->private_data = dev;
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if (filp->f_flags & O_NONBLOCK) {
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DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
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ret = -EAGAIN;
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goto out;
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}
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link->open = 1;
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mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
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DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
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ret = nonseekable_open(inode, filp);
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out:
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mutex_unlock(&cm4040_mutex);
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return ret;
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}
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static int cm4040_close(struct inode *inode, struct file *filp)
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{
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struct reader_dev *dev = filp->private_data;
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struct pcmcia_device *link;
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int minor = iminor(inode);
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DEBUGP(2, dev, "-> cm4040_close(maj/min=%d.%d)\n", imajor(inode),
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iminor(inode));
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if (minor >= CM_MAX_DEV)
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return -ENODEV;
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link = dev_table[minor];
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if (link == NULL)
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return -ENODEV;
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cm4040_stop_poll(dev);
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link->open = 0;
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wake_up(&dev->devq);
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DEBUGP(2, dev, "<- cm4040_close\n");
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return 0;
|
|
}
|
|
|
|
static void cm4040_reader_release(struct pcmcia_device *link)
|
|
{
|
|
struct reader_dev *dev = link->priv;
|
|
|
|
DEBUGP(3, dev, "-> cm4040_reader_release\n");
|
|
while (link->open) {
|
|
DEBUGP(3, dev, MODULE_NAME ": delaying release "
|
|
"until process has terminated\n");
|
|
wait_event(dev->devq, (link->open == 0));
|
|
}
|
|
DEBUGP(3, dev, "<- cm4040_reader_release\n");
|
|
return;
|
|
}
|
|
|
|
static int cm4040_config_check(struct pcmcia_device *p_dev, void *priv_data)
|
|
{
|
|
return pcmcia_request_io(p_dev);
|
|
}
|
|
|
|
|
|
static int reader_config(struct pcmcia_device *link, int devno)
|
|
{
|
|
struct reader_dev *dev;
|
|
int fail_rc;
|
|
|
|
link->config_flags |= CONF_AUTO_SET_IO;
|
|
|
|
if (pcmcia_loop_config(link, cm4040_config_check, NULL))
|
|
goto cs_release;
|
|
|
|
fail_rc = pcmcia_enable_device(link);
|
|
if (fail_rc != 0) {
|
|
dev_info(&link->dev, "pcmcia_enable_device failed 0x%x\n",
|
|
fail_rc);
|
|
goto cs_release;
|
|
}
|
|
|
|
dev = link->priv;
|
|
|
|
DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno,
|
|
link->resource[0]);
|
|
DEBUGP(2, dev, "<- reader_config (succ)\n");
|
|
|
|
return 0;
|
|
|
|
cs_release:
|
|
reader_release(link);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void reader_release(struct pcmcia_device *link)
|
|
{
|
|
cm4040_reader_release(link);
|
|
pcmcia_disable_device(link);
|
|
}
|
|
|
|
static int reader_probe(struct pcmcia_device *link)
|
|
{
|
|
struct reader_dev *dev;
|
|
int i, ret;
|
|
|
|
for (i = 0; i < CM_MAX_DEV; i++) {
|
|
if (dev_table[i] == NULL)
|
|
break;
|
|
}
|
|
|
|
if (i == CM_MAX_DEV)
|
|
return -ENODEV;
|
|
|
|
dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
|
|
if (dev == NULL)
|
|
return -ENOMEM;
|
|
|
|
dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
|
|
dev->buffer_status = 0;
|
|
|
|
link->priv = dev;
|
|
dev->p_dev = link;
|
|
|
|
dev_table[i] = link;
|
|
|
|
init_waitqueue_head(&dev->devq);
|
|
init_waitqueue_head(&dev->poll_wait);
|
|
init_waitqueue_head(&dev->read_wait);
|
|
init_waitqueue_head(&dev->write_wait);
|
|
timer_setup(&dev->poll_timer, cm4040_do_poll, 0);
|
|
|
|
ret = reader_config(link, i);
|
|
if (ret) {
|
|
dev_table[i] = NULL;
|
|
kfree(dev);
|
|
return ret;
|
|
}
|
|
|
|
device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void reader_detach(struct pcmcia_device *link)
|
|
{
|
|
struct reader_dev *dev = link->priv;
|
|
int devno;
|
|
|
|
/* find device */
|
|
for (devno = 0; devno < CM_MAX_DEV; devno++) {
|
|
if (dev_table[devno] == link)
|
|
break;
|
|
}
|
|
if (devno == CM_MAX_DEV)
|
|
return;
|
|
|
|
reader_release(link);
|
|
|
|
dev_table[devno] = NULL;
|
|
kfree(dev);
|
|
|
|
device_destroy(cmx_class, MKDEV(major, devno));
|
|
|
|
return;
|
|
}
|
|
|
|
static const struct file_operations reader_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = cm4040_read,
|
|
.write = cm4040_write,
|
|
.open = cm4040_open,
|
|
.release = cm4040_close,
|
|
.poll = cm4040_poll,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static const struct pcmcia_device_id cm4040_ids[] = {
|
|
PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0200),
|
|
PCMCIA_DEVICE_PROD_ID12("OMNIKEY", "CardMan 4040",
|
|
0xE32CDD8C, 0x8F23318B),
|
|
PCMCIA_DEVICE_NULL,
|
|
};
|
|
MODULE_DEVICE_TABLE(pcmcia, cm4040_ids);
|
|
|
|
static struct pcmcia_driver reader_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "cm4040_cs",
|
|
.probe = reader_probe,
|
|
.remove = reader_detach,
|
|
.id_table = cm4040_ids,
|
|
};
|
|
|
|
static int __init cm4040_init(void)
|
|
{
|
|
int rc;
|
|
|
|
cmx_class = class_create(THIS_MODULE, "cardman_4040");
|
|
if (IS_ERR(cmx_class))
|
|
return PTR_ERR(cmx_class);
|
|
|
|
major = register_chrdev(0, DEVICE_NAME, &reader_fops);
|
|
if (major < 0) {
|
|
printk(KERN_WARNING MODULE_NAME
|
|
": could not get major number\n");
|
|
class_destroy(cmx_class);
|
|
return major;
|
|
}
|
|
|
|
rc = pcmcia_register_driver(&reader_driver);
|
|
if (rc < 0) {
|
|
unregister_chrdev(major, DEVICE_NAME);
|
|
class_destroy(cmx_class);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cm4040_exit(void)
|
|
{
|
|
pcmcia_unregister_driver(&reader_driver);
|
|
unregister_chrdev(major, DEVICE_NAME);
|
|
class_destroy(cmx_class);
|
|
}
|
|
|
|
module_init(cm4040_init);
|
|
module_exit(cm4040_exit);
|
|
MODULE_LICENSE("Dual BSD/GPL");
|