linux/include/linux/parport.h
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   1/*
   2 * Any part of this program may be used in documents licensed under
   3 * the GNU Free Documentation License, Version 1.1 or any later version
   4 * published by the Free Software Foundation.
   5 */
   6
   7#ifndef _PARPORT_H_
   8#define _PARPORT_H_
   9
  10/* Start off with user-visible constants */
  11
  12/* Maximum of 16 ports per machine */
  13#define PARPORT_MAX  16
  14
  15/* Magic numbers */
  16#define PARPORT_IRQ_NONE  -1
  17#define PARPORT_DMA_NONE  -1
  18#define PARPORT_IRQ_AUTO  -2
  19#define PARPORT_DMA_AUTO  -2
  20#define PARPORT_DMA_NOFIFO -3
  21#define PARPORT_DISABLE   -2
  22#define PARPORT_IRQ_PROBEONLY -3
  23#define PARPORT_IOHI_AUTO -1
  24
  25#define PARPORT_CONTROL_STROBE    0x1
  26#define PARPORT_CONTROL_AUTOFD    0x2
  27#define PARPORT_CONTROL_INIT      0x4
  28#define PARPORT_CONTROL_SELECT    0x8
  29
  30#define PARPORT_STATUS_ERROR      0x8
  31#define PARPORT_STATUS_SELECT     0x10
  32#define PARPORT_STATUS_PAPEROUT   0x20
  33#define PARPORT_STATUS_ACK        0x40
  34#define PARPORT_STATUS_BUSY       0x80
  35
  36/* Type classes for Plug-and-Play probe.  */
  37typedef enum {
  38        PARPORT_CLASS_LEGACY = 0,       /* Non-IEEE1284 device */
  39        PARPORT_CLASS_PRINTER,
  40        PARPORT_CLASS_MODEM,
  41        PARPORT_CLASS_NET,
  42        PARPORT_CLASS_HDC,              /* Hard disk controller */
  43        PARPORT_CLASS_PCMCIA,
  44        PARPORT_CLASS_MEDIA,            /* Multimedia device */
  45        PARPORT_CLASS_FDC,              /* Floppy disk controller */
  46        PARPORT_CLASS_PORTS,
  47        PARPORT_CLASS_SCANNER,
  48        PARPORT_CLASS_DIGCAM,
  49        PARPORT_CLASS_OTHER,            /* Anything else */
  50        PARPORT_CLASS_UNSPEC,           /* No CLS field in ID */
  51        PARPORT_CLASS_SCSIADAPTER
  52} parport_device_class;
  53
  54/* The "modes" entry in parport is a bit field representing the
  55   capabilities of the hardware. */
  56#define PARPORT_MODE_PCSPP      (1<<0) /* IBM PC registers available. */
  57#define PARPORT_MODE_TRISTATE   (1<<1) /* Can tristate. */
  58#define PARPORT_MODE_EPP        (1<<2) /* Hardware EPP. */
  59#define PARPORT_MODE_ECP        (1<<3) /* Hardware ECP. */
  60#define PARPORT_MODE_COMPAT     (1<<4) /* Hardware 'printer protocol'. */
  61#define PARPORT_MODE_DMA        (1<<5) /* Hardware can DMA. */
  62#define PARPORT_MODE_SAFEININT  (1<<6) /* SPP registers accessible in IRQ. */
  63
  64/* IEEE1284 modes: 
  65   Nibble mode, byte mode, ECP, ECPRLE and EPP are their own
  66   'extensibility request' values.  Others are special.
  67   'Real' ECP modes must have the IEEE1284_MODE_ECP bit set.  */
  68#define IEEE1284_MODE_NIBBLE             0
  69#define IEEE1284_MODE_BYTE              (1<<0)
  70#define IEEE1284_MODE_COMPAT            (1<<8)
  71#define IEEE1284_MODE_BECP              (1<<9) /* Bounded ECP mode */
  72#define IEEE1284_MODE_ECP               (1<<4)
  73#define IEEE1284_MODE_ECPRLE            (IEEE1284_MODE_ECP | (1<<5))
  74#define IEEE1284_MODE_ECPSWE            (1<<10) /* Software-emulated */
  75#define IEEE1284_MODE_EPP               (1<<6)
  76#define IEEE1284_MODE_EPPSL             (1<<11) /* EPP 1.7 */
  77#define IEEE1284_MODE_EPPSWE            (1<<12) /* Software-emulated */
  78#define IEEE1284_DEVICEID               (1<<2)  /* This is a flag */
  79#define IEEE1284_EXT_LINK               (1<<14) /* This flag causes the
  80                                                 * extensibility link to
  81                                                 * be requested, using
  82                                                 * bits 0-6. */
  83
  84/* For the benefit of parport_read/write, you can use these with
  85 * parport_negotiate to use address operations.  They have no effect
  86 * other than to make parport_read/write use address transfers. */
  87#define IEEE1284_ADDR                   (1<<13) /* This is a flag */
  88#define IEEE1284_DATA                    0      /* So is this */
  89
  90/* Flags for block transfer operations. */
  91#define PARPORT_EPP_FAST                (1<<0) /* Unreliable counts. */
  92#define PARPORT_W91284PIC               (1<<1) /* have a Warp9 w91284pic in the device */
  93
  94/* The rest is for the kernel only */
  95#ifdef __KERNEL__
  96
  97#include <linux/jiffies.h>
  98#include <linux/proc_fs.h>
  99#include <linux/spinlock.h>
 100#include <linux/wait.h>
 101#include <linux/irqreturn.h>
 102#include <linux/semaphore.h>
 103#include <asm/ptrace.h>
 104
 105/* Define this later. */
 106struct parport;
 107struct pardevice;
 108
 109struct pc_parport_state {
 110        unsigned int ctr;
 111        unsigned int ecr;
 112};
 113
 114struct ax_parport_state {
 115        unsigned int ctr;
 116        unsigned int ecr;
 117        unsigned int dcsr;
 118};
 119
 120/* used by both parport_amiga and parport_mfc3 */
 121struct amiga_parport_state {
 122       unsigned char data;     /* ciaa.prb */
 123       unsigned char datadir;  /* ciaa.ddrb */
 124       unsigned char status;   /* ciab.pra & 7 */
 125       unsigned char statusdir;/* ciab.ddrb & 7 */
 126};
 127
 128struct ax88796_parport_state {
 129        unsigned char cpr;
 130};
 131
 132struct ip32_parport_state {
 133        unsigned int dcr;
 134        unsigned int ecr;
 135};
 136
 137struct parport_state {
 138        union {
 139                struct pc_parport_state pc;
 140                /* ARC has no state. */
 141                struct ax_parport_state ax;
 142                struct amiga_parport_state amiga;
 143                struct ax88796_parport_state ax88796;
 144                /* Atari has not state. */
 145                struct ip32_parport_state ip32;
 146                void *misc; 
 147        } u;
 148};
 149
 150struct parport_operations {
 151        /* IBM PC-style virtual registers. */
 152        void (*write_data)(struct parport *, unsigned char);
 153        unsigned char (*read_data)(struct parport *);
 154
 155        void (*write_control)(struct parport *, unsigned char);
 156        unsigned char (*read_control)(struct parport *);
 157        unsigned char (*frob_control)(struct parport *, unsigned char mask,
 158                                      unsigned char val);
 159
 160        unsigned char (*read_status)(struct parport *);
 161
 162        /* IRQs. */
 163        void (*enable_irq)(struct parport *);
 164        void (*disable_irq)(struct parport *);
 165
 166        /* Data direction. */
 167        void (*data_forward) (struct parport *);
 168        void (*data_reverse) (struct parport *);
 169
 170        /* For core parport code. */
 171        void (*init_state)(struct pardevice *, struct parport_state *);
 172        void (*save_state)(struct parport *, struct parport_state *);
 173        void (*restore_state)(struct parport *, struct parport_state *);
 174
 175        /* Block read/write */
 176        size_t (*epp_write_data) (struct parport *port, const void *buf,
 177                                  size_t len, int flags);
 178        size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
 179                                 int flags);
 180        size_t (*epp_write_addr) (struct parport *port, const void *buf,
 181                                  size_t len, int flags);
 182        size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
 183                                 int flags);
 184
 185        size_t (*ecp_write_data) (struct parport *port, const void *buf,
 186                                  size_t len, int flags);
 187        size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
 188                                 int flags);
 189        size_t (*ecp_write_addr) (struct parport *port, const void *buf,
 190                                  size_t len, int flags);
 191
 192        size_t (*compat_write_data) (struct parport *port, const void *buf,
 193                                     size_t len, int flags);
 194        size_t (*nibble_read_data) (struct parport *port, void *buf,
 195                                    size_t len, int flags);
 196        size_t (*byte_read_data) (struct parport *port, void *buf,
 197                                  size_t len, int flags);
 198        struct module *owner;
 199};
 200
 201struct parport_device_info {
 202        parport_device_class class;
 203        const char *class_name;
 204        const char *mfr;
 205        const char *model;
 206        const char *cmdset;
 207        const char *description;
 208};
 209
 210/* Each device can have two callback functions:
 211 *  1) a preemption function, called by the resource manager to request
 212 *     that the driver relinquish control of the port.  The driver should
 213 *     return zero if it agrees to release the port, and nonzero if it 
 214 *     refuses.  Do not call parport_release() - the kernel will do this
 215 *     implicitly.
 216 *
 217 *  2) a wake-up function, called by the resource manager to tell drivers
 218 *     that the port is available to be claimed.  If a driver wants to use
 219 *     the port, it should call parport_claim() here.
 220 */
 221
 222/* A parallel port device */
 223struct pardevice {
 224        const char *name;
 225        struct parport *port;
 226        int daisy;
 227        int (*preempt)(void *);
 228        void (*wakeup)(void *);
 229        void *private;
 230        void (*irq_func)(void *);
 231        unsigned int flags;
 232        struct pardevice *next;
 233        struct pardevice *prev;
 234        struct parport_state *state;     /* saved status over preemption */
 235        wait_queue_head_t wait_q;
 236        unsigned long int time;
 237        unsigned long int timeslice;
 238        volatile long int timeout;
 239        unsigned long waiting;           /* long req'd for set_bit --RR */
 240        struct pardevice *waitprev;
 241        struct pardevice *waitnext;
 242        void * sysctl_table;
 243};
 244
 245/* IEEE1284 information */
 246
 247/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
 248 * PP[GS]ETPHASE, so do not change existing values. */
 249enum ieee1284_phase {
 250        IEEE1284_PH_FWD_DATA,
 251        IEEE1284_PH_FWD_IDLE,
 252        IEEE1284_PH_TERMINATE,
 253        IEEE1284_PH_NEGOTIATION,
 254        IEEE1284_PH_HBUSY_DNA,
 255        IEEE1284_PH_REV_IDLE,
 256        IEEE1284_PH_HBUSY_DAVAIL,
 257        IEEE1284_PH_REV_DATA,
 258        IEEE1284_PH_ECP_SETUP,
 259        IEEE1284_PH_ECP_FWD_TO_REV,
 260        IEEE1284_PH_ECP_REV_TO_FWD,
 261        IEEE1284_PH_ECP_DIR_UNKNOWN,
 262};
 263struct ieee1284_info {
 264        int mode;
 265        volatile enum ieee1284_phase phase;
 266        struct semaphore irq;
 267};
 268
 269/* A parallel port */
 270struct parport {
 271        unsigned long base;     /* base address */
 272        unsigned long base_hi;  /* base address (hi - ECR) */
 273        unsigned int size;      /* IO extent */
 274        const char *name;
 275        unsigned int modes;
 276        int irq;                /* interrupt (or -1 for none) */
 277        int dma;
 278        int muxport;            /* which muxport (if any) this is */
 279        int portnum;            /* which physical parallel port (not mux) */
 280        struct device *dev;     /* Physical device associated with IO/DMA.
 281                                 * This may unfortulately be null if the
 282                                 * port has a legacy driver.
 283                                 */
 284
 285        struct parport *physport;
 286                                /* If this is a non-default mux
 287                                   parport, i.e. we're a clone of a real
 288                                   physical port, this is a pointer to that
 289                                   port. The locking is only done in the
 290                                   real port.  For a clone port, the
 291                                   following structure members are
 292                                   meaningless: devices, cad, muxsel,
 293                                   waithead, waittail, flags, pdir,
 294                                   dev, ieee1284, *_lock.
 295
 296                                   It this is a default mux parport, or
 297                                   there is no mux involved, this points to
 298                                   ourself. */
 299
 300        struct pardevice *devices;
 301        struct pardevice *cad;  /* port owner */
 302        int daisy;              /* currently selected daisy addr */
 303        int muxsel;             /* currently selected mux port */
 304
 305        struct pardevice *waithead;
 306        struct pardevice *waittail;
 307
 308        struct list_head list;
 309        unsigned int flags;
 310
 311        void *sysctl_table;
 312        struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
 313        struct ieee1284_info ieee1284;
 314
 315        struct parport_operations *ops;
 316        void *private_data;     /* for lowlevel driver */
 317
 318        int number;             /* port index - the `n' in `parportn' */
 319        spinlock_t pardevice_lock;
 320        spinlock_t waitlist_lock;
 321        rwlock_t cad_lock;
 322
 323        int spintime;
 324        atomic_t ref_count;
 325
 326        unsigned long devflags;
 327#define PARPORT_DEVPROC_REGISTERED      0
 328        struct pardevice *proc_device;  /* Currently register proc device */
 329
 330        struct list_head full_list;
 331        struct parport *slaves[3];
 332};
 333
 334#define DEFAULT_SPIN_TIME 500 /* us */
 335
 336struct parport_driver {
 337        const char *name;
 338        void (*attach) (struct parport *);
 339        void (*detach) (struct parport *);
 340        struct list_head list;
 341};
 342
 343/* parport_register_port registers a new parallel port at the given
 344   address (if one does not already exist) and returns a pointer to it.
 345   This entails claiming the I/O region, IRQ and DMA.  NULL is returned
 346   if initialisation fails. */
 347struct parport *parport_register_port(unsigned long base, int irq, int dma,
 348                                      struct parport_operations *ops);
 349
 350/* Once a registered port is ready for high-level drivers to use, the
 351   low-level driver that registered it should announce it.  This will
 352   call the high-level drivers' attach() functions (after things like
 353   determining the IEEE 1284.3 topology of the port and collecting
 354   DeviceIDs). */
 355void parport_announce_port (struct parport *port);
 356
 357/* Unregister a port. */
 358extern void parport_remove_port(struct parport *port);
 359
 360/* Register a new high-level driver. */
 361extern int parport_register_driver (struct parport_driver *);
 362
 363/* Unregister a high-level driver. */
 364extern void parport_unregister_driver (struct parport_driver *);
 365
 366/* If parport_register_driver doesn't fit your needs, perhaps
 367 * parport_find_xxx does. */
 368extern struct parport *parport_find_number (int);
 369extern struct parport *parport_find_base (unsigned long);
 370
 371/* generic irq handler, if it suits your needs */
 372extern irqreturn_t parport_irq_handler(int irq, void *dev_id);
 373
 374/* Reference counting for ports. */
 375extern struct parport *parport_get_port (struct parport *);
 376extern void parport_put_port (struct parport *);
 377
 378/* parport_register_device declares that a device is connected to a
 379   port, and tells the kernel all it needs to know.
 380   - pf is the preemption function (may be NULL for no callback)
 381   - kf is the wake-up function (may be NULL for no callback)
 382   - irq_func is the interrupt handler (may be NULL for no interrupts)
 383   - handle is a user pointer that gets handed to callback functions.  */
 384struct pardevice *parport_register_device(struct parport *port, 
 385                          const char *name,
 386                          int (*pf)(void *), void (*kf)(void *),
 387                          void (*irq_func)(void *), 
 388                          int flags, void *handle);
 389
 390/* parport_unregister unlinks a device from the chain. */
 391extern void parport_unregister_device(struct pardevice *dev);
 392
 393/* parport_claim tries to gain ownership of the port for a particular
 394   driver.  This may fail (return non-zero) if another driver is busy.
 395   If this driver has registered an interrupt handler, it will be
 396   enabled.  */
 397extern int parport_claim(struct pardevice *dev);
 398
 399/* parport_claim_or_block is the same, but sleeps if the port cannot
 400   be claimed.  Return value is 1 if it slept, 0 normally and -errno
 401   on error.  */
 402extern int parport_claim_or_block(struct pardevice *dev);
 403
 404/* parport_release reverses a previous parport_claim.  This can never
 405   fail, though the effects are undefined (except that they are bad)
 406   if you didn't previously own the port.  Once you have released the
 407   port you should make sure that neither your code nor the hardware
 408   on the port tries to initiate any communication without first
 409   re-claiming the port.  If you mess with the port state (enabling
 410   ECP for example) you should clean up before releasing the port. */
 411
 412extern void parport_release(struct pardevice *dev);
 413
 414/**
 415 * parport_yield - relinquish a parallel port temporarily
 416 * @dev: a device on the parallel port
 417 *
 418 * This function relinquishes the port if it would be helpful to other
 419 * drivers to do so.  Afterwards it tries to reclaim the port using
 420 * parport_claim(), and the return value is the same as for
 421 * parport_claim().  If it fails, the port is left unclaimed and it is
 422 * the driver's responsibility to reclaim the port.
 423 *
 424 * The parport_yield() and parport_yield_blocking() functions are for
 425 * marking points in the driver at which other drivers may claim the
 426 * port and use their devices.  Yielding the port is similar to
 427 * releasing it and reclaiming it, but is more efficient because no
 428 * action is taken if there are no other devices needing the port.  In
 429 * fact, nothing is done even if there are other devices waiting but
 430 * the current device is still within its "timeslice".  The default
 431 * timeslice is half a second, but it can be adjusted via the /proc
 432 * interface.
 433 **/
 434static __inline__ int parport_yield(struct pardevice *dev)
 435{
 436        unsigned long int timeslip = (jiffies - dev->time);
 437        if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 438                return 0;
 439        parport_release(dev);
 440        return parport_claim(dev);
 441}
 442
 443/**
 444 * parport_yield_blocking - relinquish a parallel port temporarily
 445 * @dev: a device on the parallel port
 446 *
 447 * This function relinquishes the port if it would be helpful to other
 448 * drivers to do so.  Afterwards it tries to reclaim the port using
 449 * parport_claim_or_block(), and the return value is the same as for
 450 * parport_claim_or_block().
 451 **/
 452static __inline__ int parport_yield_blocking(struct pardevice *dev)
 453{
 454        unsigned long int timeslip = (jiffies - dev->time);
 455        if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 456                return 0;
 457        parport_release(dev);
 458        return parport_claim_or_block(dev);
 459}
 460
 461/* Flags used to identify what a device does. */
 462#define PARPORT_DEV_TRAN                0       /* WARNING !! DEPRECATED !! */
 463#define PARPORT_DEV_LURK                (1<<0)  /* WARNING !! DEPRECATED !! */
 464#define PARPORT_DEV_EXCL                (1<<1)  /* Need exclusive access. */
 465
 466#define PARPORT_FLAG_EXCL               (1<<1)  /* EXCL driver registered. */
 467
 468/* IEEE1284 functions */
 469extern void parport_ieee1284_interrupt (void *);
 470extern int parport_negotiate (struct parport *, int mode);
 471extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
 472extern ssize_t parport_read (struct parport *, void *buf, size_t len);
 473
 474#define PARPORT_INACTIVITY_O_NONBLOCK 1
 475extern long parport_set_timeout (struct pardevice *, long inactivity);
 476
 477extern int parport_wait_event (struct parport *, long timeout);
 478extern int parport_wait_peripheral (struct parport *port,
 479                                    unsigned char mask,
 480                                    unsigned char val);
 481extern int parport_poll_peripheral (struct parport *port,
 482                                    unsigned char mask,
 483                                    unsigned char val,
 484                                    int usec);
 485
 486/* For architectural drivers */
 487extern size_t parport_ieee1284_write_compat (struct parport *,
 488                                             const void *, size_t, int);
 489extern size_t parport_ieee1284_read_nibble (struct parport *,
 490                                            void *, size_t, int);
 491extern size_t parport_ieee1284_read_byte (struct parport *,
 492                                          void *, size_t, int);
 493extern size_t parport_ieee1284_ecp_read_data (struct parport *,
 494                                              void *, size_t, int);
 495extern size_t parport_ieee1284_ecp_write_data (struct parport *,
 496                                               const void *, size_t, int);
 497extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
 498                                               const void *, size_t, int);
 499extern size_t parport_ieee1284_epp_write_data (struct parport *,
 500                                               const void *, size_t, int);
 501extern size_t parport_ieee1284_epp_read_data (struct parport *,
 502                                              void *, size_t, int);
 503extern size_t parport_ieee1284_epp_write_addr (struct parport *,
 504                                               const void *, size_t, int);
 505extern size_t parport_ieee1284_epp_read_addr (struct parport *,
 506                                              void *, size_t, int);
 507
 508/* IEEE1284.3 functions */
 509extern int parport_daisy_init (struct parport *port);
 510extern void parport_daisy_fini (struct parport *port);
 511extern struct pardevice *parport_open (int devnum, const char *name);
 512extern void parport_close (struct pardevice *dev);
 513extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
 514extern void parport_daisy_deselect_all (struct parport *port);
 515extern int parport_daisy_select (struct parport *port, int daisy, int mode);
 516
 517/* Lowlevel drivers _can_ call this support function to handle irqs.  */
 518static inline void parport_generic_irq(struct parport *port)
 519{
 520        parport_ieee1284_interrupt (port);
 521        read_lock(&port->cad_lock);
 522        if (port->cad && port->cad->irq_func)
 523                port->cad->irq_func(port->cad->private);
 524        read_unlock(&port->cad_lock);
 525}
 526
 527/* Prototypes from parport_procfs */
 528extern int parport_proc_register(struct parport *pp);
 529extern int parport_proc_unregister(struct parport *pp);
 530extern int parport_device_proc_register(struct pardevice *device);
 531extern int parport_device_proc_unregister(struct pardevice *device);
 532
 533/* If PC hardware is the only type supported, we can optimise a bit.  */
 534#if !defined(CONFIG_PARPORT_NOT_PC)
 535
 536#include <linux/parport_pc.h>
 537#define parport_write_data(p,x)            parport_pc_write_data(p,x)
 538#define parport_read_data(p)               parport_pc_read_data(p)
 539#define parport_write_control(p,x)         parport_pc_write_control(p,x)
 540#define parport_read_control(p)            parport_pc_read_control(p)
 541#define parport_frob_control(p,m,v)        parport_pc_frob_control(p,m,v)
 542#define parport_read_status(p)             parport_pc_read_status(p)
 543#define parport_enable_irq(p)              parport_pc_enable_irq(p)
 544#define parport_disable_irq(p)             parport_pc_disable_irq(p)
 545#define parport_data_forward(p)            parport_pc_data_forward(p)
 546#define parport_data_reverse(p)            parport_pc_data_reverse(p)
 547
 548#else  /*  !CONFIG_PARPORT_NOT_PC  */
 549
 550/* Generic operations vector through the dispatch table. */
 551#define parport_write_data(p,x)            (p)->ops->write_data(p,x)
 552#define parport_read_data(p)               (p)->ops->read_data(p)
 553#define parport_write_control(p,x)         (p)->ops->write_control(p,x)
 554#define parport_read_control(p)            (p)->ops->read_control(p)
 555#define parport_frob_control(p,m,v)        (p)->ops->frob_control(p,m,v)
 556#define parport_read_status(p)             (p)->ops->read_status(p)
 557#define parport_enable_irq(p)              (p)->ops->enable_irq(p)
 558#define parport_disable_irq(p)             (p)->ops->disable_irq(p)
 559#define parport_data_forward(p)            (p)->ops->data_forward(p)
 560#define parport_data_reverse(p)            (p)->ops->data_reverse(p)
 561
 562#endif /*  !CONFIG_PARPORT_NOT_PC  */
 563
 564extern unsigned long parport_default_timeslice;
 565extern int parport_default_spintime;
 566
 567#endif /* __KERNEL__ */
 568#endif /* _PARPORT_H_ */
 569
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