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685 lines
15 KiB
685 lines
15 KiB
/* |
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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 <[email protected]> |
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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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|
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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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|
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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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|
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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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|
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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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|
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static DEFINE_MUTEX(cm4040_mutex); |
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|
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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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|
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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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|
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static void reader_release(struct pcmcia_device *link); |
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|
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static int major; |
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static struct class *cmx_class; |
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|
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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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|
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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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|
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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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|
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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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|
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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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unsigned char uc; |
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DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid); |
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|
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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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uc = 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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev); |
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|
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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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|
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poll_wait(filp, &dev->poll_wait, wait); |
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|
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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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|
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DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask); |
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|
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return mask; |
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} |
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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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|
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if (minor >= CM_MAX_DEV) |
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return -ENODEV; |
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|
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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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|
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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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|
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dev = link->priv; |
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filp->private_data = dev; |
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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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ret = -EAGAIN; |
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goto out; |
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} |
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|
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link->open = 1; |
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|
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mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD); |
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|
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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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|
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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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|
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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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|
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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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|
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cm4040_stop_poll(dev); |
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|
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link->open = 0; |
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wake_up(&dev->devq); |
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|
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DEBUGP(2, dev, "<- cm4040_close\n"); |
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return 0; |
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} |
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|
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static void cm4040_reader_release(struct pcmcia_device *link) |
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{ |
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struct reader_dev *dev = link->priv; |
|
|
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DEBUGP(3, dev, "-> cm4040_reader_release\n"); |
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while (link->open) { |
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DEBUGP(3, dev, MODULE_NAME ": delaying release " |
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"until process has terminated\n"); |
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wait_event(dev->devq, (link->open == 0)); |
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} |
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DEBUGP(3, dev, "<- cm4040_reader_release\n"); |
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return; |
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} |
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static int cm4040_config_check(struct pcmcia_device *p_dev, void *priv_data) |
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{ |
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return pcmcia_request_io(p_dev); |
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} |
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|
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|
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static int reader_config(struct pcmcia_device *link, int devno) |
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{ |
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struct reader_dev *dev; |
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int fail_rc; |
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|
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link->config_flags |= CONF_AUTO_SET_IO; |
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|
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if (pcmcia_loop_config(link, cm4040_config_check, NULL)) |
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goto cs_release; |
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|
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fail_rc = pcmcia_enable_device(link); |
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if (fail_rc != 0) { |
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dev_info(&link->dev, "pcmcia_enable_device failed 0x%x\n", |
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fail_rc); |
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goto cs_release; |
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} |
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|
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dev = link->priv; |
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|
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DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno, |
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link->resource[0]); |
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DEBUGP(2, dev, "<- reader_config (succ)\n"); |
|
|
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return 0; |
|
|
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cs_release: |
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reader_release(link); |
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return -ENODEV; |
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} |
|
|
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static void reader_release(struct pcmcia_device *link) |
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{ |
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cm4040_reader_release(link); |
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pcmcia_disable_device(link); |
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} |
|
|
|
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");
|
|
|