drivers/media/video/pvrusb2/pvrusb2-hdw.h - kernel/skids - Git at Google

 /*
  *
  *
  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */
 #ifndef __PVRUSB2_HDW_H
 #define __PVRUSB2_HDW_H

 #include <linux/usb.h>
 #include <linux/videodev2.h>
 #include "pvrusb2-io.h"
 #include "pvrusb2-ctrl.h"


 /* Private internal control ids, look these up with
    pvr2_hdw_get_ctrl_by_id() - these are NOT visible in V4L */
 #define PVR2_CID_STDENUM 1
 #define PVR2_CID_STDCUR 2
 #define PVR2_CID_STDAVAIL 3
 #define PVR2_CID_INPUT 4
 #define PVR2_CID_AUDIOMODE 5
 #define PVR2_CID_FREQUENCY 6
 #define PVR2_CID_HRES 7
 #define PVR2_CID_VRES 8
 #define PVR2_CID_CROPL 9
 #define PVR2_CID_CROPT 10
 #define PVR2_CID_CROPW 11
 #define PVR2_CID_CROPH 12
 #define PVR2_CID_CROPCAPPAN 13
 #define PVR2_CID_CROPCAPPAD 14
 #define PVR2_CID_CROPCAPBL 15
 #define PVR2_CID_CROPCAPBT 16
 #define PVR2_CID_CROPCAPBW 17
 #define PVR2_CID_CROPCAPBH 18

 /* Legal values for the INPUT state variable */
 #define PVR2_CVAL_INPUT_TV 0
 #define PVR2_CVAL_INPUT_DTV 1
 #define PVR2_CVAL_INPUT_COMPOSITE 2
 #define PVR2_CVAL_INPUT_SVIDEO 3
 #define PVR2_CVAL_INPUT_RADIO 4

 enum pvr2_config {
 	pvr2_config_empty,    /* No configuration */
 	pvr2_config_mpeg,     /* Encoded / compressed video */
 	pvr2_config_vbi,      /* Standard vbi info */
 	pvr2_config_pcm,      /* Audio raw pcm stream */
 	pvr2_config_rawvideo, /* Video raw frames */
 };

 enum pvr2_v4l_type {
 	pvr2_v4l_type_video,
 	pvr2_v4l_type_vbi,
 	pvr2_v4l_type_radio,
 };

 /* Major states that we can be in:
  *
  *  DEAD - Device is in an unusable state and cannot be recovered.  This
  *  can happen if we completely lose the ability to communicate with it
  *  (but it might still on the bus).  In this state there's nothing we can
  *  do; it must be replugged in order to recover.
  *
  *  COLD - Device is in an unusuable state, needs microcontroller firmware.
  *
  *  WARM - We can communicate with the device and the proper
  *  microcontroller firmware is running, but other device initialization is
  *  still needed (e.g. encoder firmware).
  *
  *  ERROR - A problem prevents capture operation (e.g. encoder firmware
  *  missing).
  *
  *  READY - Device is operational, but not streaming.
  *
  *  RUN - Device is streaming.
  *
  */
 #define PVR2_STATE_NONE 0
 #define PVR2_STATE_DEAD 1
 #define PVR2_STATE_COLD 2
 #define PVR2_STATE_WARM 3
 #define PVR2_STATE_ERROR 4
 #define PVR2_STATE_READY 5
 #define PVR2_STATE_RUN 6

 /* Translate configuration enum to a string label */
 const char *pvr2_config_get_name(enum pvr2_config);

 struct pvr2_hdw;

 /* Create and return a structure for interacting with the underlying
    hardware */
 struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
 				 const struct usb_device_id *devid);

 /* Perform second stage initialization, passing in a notification callback
    for when the master state changes. */
 int pvr2_hdw_initialize(struct pvr2_hdw *,
 			void (*callback_func)(void *),
 			void *callback_data);

 /* Destroy hardware interaction structure */
 void pvr2_hdw_destroy(struct pvr2_hdw *);

 /* Return true if in the ready (normal) state */
 int pvr2_hdw_dev_ok(struct pvr2_hdw *);

 /* Return small integer number [1..N] for logical instance number of this
    device.  This is useful for indexing array-valued module parameters. */
 int pvr2_hdw_get_unit_number(struct pvr2_hdw *);

 /* Get pointer to underlying USB device */
 struct usb_device *pvr2_hdw_get_dev(struct pvr2_hdw *);

 /* Retrieve serial number of device */
 unsigned long pvr2_hdw_get_sn(struct pvr2_hdw *);

 /* Retrieve bus location info of device */
 const char *pvr2_hdw_get_bus_info(struct pvr2_hdw *);

 /* Retrieve per-instance string identifier for this specific device */
 const char *pvr2_hdw_get_device_identifier(struct pvr2_hdw *);

 /* Called when hardware has been unplugged */
 void pvr2_hdw_disconnect(struct pvr2_hdw *);

 /* Get the number of defined controls */
 unsigned int pvr2_hdw_get_ctrl_count(struct pvr2_hdw *);

 /* Retrieve a control handle given its index (0..count-1) */
 struct pvr2_ctrl *pvr2_hdw_get_ctrl_by_index(struct pvr2_hdw *,unsigned int);

 /* Retrieve a control handle given its internal ID (if any) */
 struct pvr2_ctrl *pvr2_hdw_get_ctrl_by_id(struct pvr2_hdw *,unsigned int);

 /* Retrieve a control handle given its V4L ID (if any) */
 struct pvr2_ctrl *pvr2_hdw_get_ctrl_v4l(struct pvr2_hdw *,unsigned int ctl_id);

 /* Retrieve a control handle given its immediate predecessor V4L ID (if any) */
 struct pvr2_ctrl *pvr2_hdw_get_ctrl_nextv4l(struct pvr2_hdw *,
 					    unsigned int ctl_id);

 /* Commit all control changes made up to this point */
 int pvr2_hdw_commit_ctl(struct pvr2_hdw *);

 /* Return a bit mask of valid input selections for this device.  Mask bits
  * will be according to PVR_CVAL_INPUT_xxxx definitions. */
 unsigned int pvr2_hdw_get_input_available(struct pvr2_hdw *);

 /* Return a bit mask of allowed input selections for this device.  Mask bits
  * will be according to PVR_CVAL_INPUT_xxxx definitions. */
 unsigned int pvr2_hdw_get_input_allowed(struct pvr2_hdw *);

 /* Change the set of allowed input selections for this device.  Both
    change_mask and change_valu are mask bits according to
    PVR_CVAL_INPUT_xxxx definitions.  The change_mask parameter indicate
    which settings are being changed and the change_val parameter indicates
    whether corresponding settings are being set or cleared. */
 int pvr2_hdw_set_input_allowed(struct pvr2_hdw *,
 			       unsigned int change_mask,
 			       unsigned int change_val);

 /* Return name for this driver instance */
 const char *pvr2_hdw_get_driver_name(struct pvr2_hdw *);

 /* Mark tuner status stale so that it will be re-fetched */
 void pvr2_hdw_execute_tuner_poll(struct pvr2_hdw *);

 /* Return information about the tuner */
 int pvr2_hdw_get_tuner_status(struct pvr2_hdw *,struct v4l2_tuner *);

 /* Return information about cropping capabilities */
 int pvr2_hdw_get_cropcap(struct pvr2_hdw *, struct v4l2_cropcap *);

 /* Query device and see if it thinks it is on a high-speed USB link */
 int pvr2_hdw_is_hsm(struct pvr2_hdw *);

 /* Return a string token representative of the hardware type */
 const char *pvr2_hdw_get_type(struct pvr2_hdw *);

 /* Return a single line description of the hardware type */
 const char *pvr2_hdw_get_desc(struct pvr2_hdw *);

 /* Turn streaming on/off */
 int pvr2_hdw_set_streaming(struct pvr2_hdw *,int);

 /* Find out if streaming is on */
 int pvr2_hdw_get_streaming(struct pvr2_hdw *);

 /* Retrieve driver overall state */
 int pvr2_hdw_get_state(struct pvr2_hdw *);

 /* Configure the type of stream to generate */
 int pvr2_hdw_set_stream_type(struct pvr2_hdw *, enum pvr2_config);

 /* Get handle to video output stream */
 struct pvr2_stream *pvr2_hdw_get_video_stream(struct pvr2_hdw *);

 /* Emit a video standard struct */
 int pvr2_hdw_get_stdenum_value(struct pvr2_hdw *hdw,struct v4l2_standard *std,
 			       unsigned int idx);

 /* Enable / disable retrieval of CPU firmware or prom contents.  This must
    be enabled before pvr2_hdw_cpufw_get() will function.  Note that doing
    this may prevent the device from running (and leaving this mode may
    imply a device reset). */
 void pvr2_hdw_cpufw_set_enabled(struct pvr2_hdw *,
 				int mode, /* 0=8KB FX2, 1=16KB FX2, 2=PROM */
 				int enable_flag);

 /* Return true if we're in a mode for retrieval CPU firmware */
 int pvr2_hdw_cpufw_get_enabled(struct pvr2_hdw *);

 /* Retrieve a piece of the CPU's firmware at the given offset.  Return
    value is the number of bytes retrieved or zero if we're past the end or
    an error otherwise (e.g. if firmware retrieval is not enabled). */
 int pvr2_hdw_cpufw_get(struct pvr2_hdw *,unsigned int offs,
 		       char *buf,unsigned int cnt);

 /* Retrieve a previously stored v4l minor device number */
 int pvr2_hdw_v4l_get_minor_number(struct pvr2_hdw *,enum pvr2_v4l_type index);

 /* Store a v4l minor device number */
 void pvr2_hdw_v4l_store_minor_number(struct pvr2_hdw *,
 				     enum pvr2_v4l_type index,int);

 /* Direct read/write access to chip's registers:
    match - specify criteria to identify target chip (this is a v4l dbg struct)
    reg_id  - register number to access
    setFl   - true to set the register, false to read it
    val_ptr - storage location for source / result. */
 int pvr2_hdw_register_access(struct pvr2_hdw *,
 			     struct v4l2_dbg_match *match, u64 reg_id,
 			     int setFl, u64 *val_ptr);

 /* The following entry points are all lower level things you normally don't
    want to worry about. */

 /* Issue a command and get a response from the device.  LOTS of higher
    level stuff is built on this. */
 int pvr2_send_request(struct pvr2_hdw *,
 		      void *write_ptr,unsigned int write_len,
 		      void *read_ptr,unsigned int read_len);

 /* Slightly higher level device communication functions. */
 int pvr2_write_register(struct pvr2_hdw *, u16, u32);

 /* Call if for any reason we can't talk to the hardware anymore - this will
    cause the driver to stop flailing on the device. */
 void pvr2_hdw_render_useless(struct pvr2_hdw *);

 /* Set / clear 8051's reset bit */
 void pvr2_hdw_cpureset_assert(struct pvr2_hdw *,int);

 /* Execute a USB-commanded device reset */
 void pvr2_hdw_device_reset(struct pvr2_hdw *);

 /* Reset worker's error trapping circuit breaker */
 int pvr2_hdw_untrip(struct pvr2_hdw *);

 /* Execute hard reset command (after this point it's likely that the
    encoder will have to be reconfigured).  This also clears the "useless"
    state. */
 int pvr2_hdw_cmd_deep_reset(struct pvr2_hdw *);

 /* Execute simple reset command */
 int pvr2_hdw_cmd_powerup(struct pvr2_hdw *);

 /* suspend */
 int pvr2_hdw_cmd_powerdown(struct pvr2_hdw *);

 /* Order decoder to reset */
 int pvr2_hdw_cmd_decoder_reset(struct pvr2_hdw *);

 /* Direct manipulation of GPIO bits */
 int pvr2_hdw_gpio_get_dir(struct pvr2_hdw *hdw,u32 *);
 int pvr2_hdw_gpio_get_out(struct pvr2_hdw *hdw,u32 *);
 int pvr2_hdw_gpio_get_in(struct pvr2_hdw *hdw,u32 *);
 int pvr2_hdw_gpio_chg_dir(struct pvr2_hdw *hdw,u32 msk,u32 val);
 int pvr2_hdw_gpio_chg_out(struct pvr2_hdw *hdw,u32 msk,u32 val);

 /* This data structure is specifically for the next function... */
 struct pvr2_hdw_debug_info {
 	int big_lock_held;
 	int ctl_lock_held;
 	int flag_disconnected;
 	int flag_init_ok;
 	int flag_ok;
 	int fw1_state;
 	int flag_decoder_missed;
 	int flag_tripped;
 	int state_encoder_ok;
 	int state_encoder_run;
 	int state_decoder_run;
 	int state_decoder_ready;
 	int state_usbstream_run;
 	int state_decoder_quiescent;
 	int state_pipeline_config;
 	int state_pipeline_req;
 	int state_pipeline_pause;
 	int state_pipeline_idle;
 	int cmd_debug_state;
 	int cmd_debug_write_len;
 	int cmd_debug_read_len;
 	int cmd_debug_write_pend;
 	int cmd_debug_read_pend;
 	int cmd_debug_timeout;
 	int cmd_debug_rstatus;
 	int cmd_debug_wstatus;
 	unsigned char cmd_code;
 };

 /* Non-intrusively retrieve internal state info - this is useful for
    diagnosing lockups.  Note that this operation is completed without any
    kind of locking and so it is not atomic and may yield inconsistent
    results.  This is *purely* a debugging aid. */
 void pvr2_hdw_get_debug_info_unlocked(const struct pvr2_hdw *hdw,
 				      struct pvr2_hdw_debug_info *);

 /* Intrusively retrieve internal state info - this is useful for
    diagnosing overall driver state.  This operation synchronizes against
    the overall driver mutex - so if there are locking problems this will
    likely hang!  This is *purely* a debugging aid. */
 void pvr2_hdw_get_debug_info_locked(struct pvr2_hdw *hdw,
 				    struct pvr2_hdw_debug_info *);

 /* Report out several lines of text that describes driver internal state.
    Results are written into the passed-in buffer. */
 unsigned int pvr2_hdw_state_report(struct pvr2_hdw *hdw,
 				   char *buf_ptr,unsigned int buf_size);

 /* Cause modules to log their state once */
 void pvr2_hdw_trigger_module_log(struct pvr2_hdw *hdw);

 /* Cause encoder firmware to be uploaded into the device.  This is normally
    done autonomously, but the interface is exported here because it is also
    a debugging aid. */
 int pvr2_upload_firmware2(struct pvr2_hdw *hdw);

 #endif /* __PVRUSB2_HDW_H */

 /*
   Stuff for Emacs to see, in order to encourage consistent editing style:
   *** Local Variables: ***
   *** mode: c ***
   *** fill-column: 75 ***
   *** tab-width: 8 ***
   *** c-basic-offset: 8 ***
   *** End: ***
   */
	/*
	*
	*
	* Copyright (C) 2005 Mike Isely <isely@pobox.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/
	#ifndef __PVRUSB2_HDW_H
	#define __PVRUSB2_HDW_H

	#include <linux/usb.h>
	#include <linux/videodev2.h>
	#include "pvrusb2-io.h"
	#include "pvrusb2-ctrl.h"


	/* Private internal control ids, look these up with
	pvr2_hdw_get_ctrl_by_id() - these are NOT visible in V4L */
	#define PVR2_CID_STDENUM 1
	#define PVR2_CID_STDCUR 2
	#define PVR2_CID_STDAVAIL 3
	#define PVR2_CID_INPUT 4
	#define PVR2_CID_AUDIOMODE 5
	#define PVR2_CID_FREQUENCY 6
	#define PVR2_CID_HRES 7
	#define PVR2_CID_VRES 8
	#define PVR2_CID_CROPL 9
	#define PVR2_CID_CROPT 10
	#define PVR2_CID_CROPW 11
	#define PVR2_CID_CROPH 12
	#define PVR2_CID_CROPCAPPAN 13
	#define PVR2_CID_CROPCAPPAD 14
	#define PVR2_CID_CROPCAPBL 15
	#define PVR2_CID_CROPCAPBT 16
	#define PVR2_CID_CROPCAPBW 17
	#define PVR2_CID_CROPCAPBH 18

	/* Legal values for the INPUT state variable */
	#define PVR2_CVAL_INPUT_TV 0
	#define PVR2_CVAL_INPUT_DTV 1
	#define PVR2_CVAL_INPUT_COMPOSITE 2
	#define PVR2_CVAL_INPUT_SVIDEO 3
	#define PVR2_CVAL_INPUT_RADIO 4

	enum pvr2_config {
	pvr2_config_empty, /* No configuration */
	pvr2_config_mpeg, /* Encoded / compressed video */
	pvr2_config_vbi, /* Standard vbi info */
	pvr2_config_pcm, /* Audio raw pcm stream */
	pvr2_config_rawvideo, /* Video raw frames */
	};

	enum pvr2_v4l_type {
	pvr2_v4l_type_video,
	pvr2_v4l_type_vbi,
	pvr2_v4l_type_radio,
	};

	/* Major states that we can be in:
	*
	* DEAD - Device is in an unusable state and cannot be recovered. This
	* can happen if we completely lose the ability to communicate with it
	* (but it might still on the bus). In this state there's nothing we can
	* do; it must be replugged in order to recover.
	*
	* COLD - Device is in an unusuable state, needs microcontroller firmware.
	*
	* WARM - We can communicate with the device and the proper
	* microcontroller firmware is running, but other device initialization is
	* still needed (e.g. encoder firmware).
	*
	* ERROR - A problem prevents capture operation (e.g. encoder firmware
	* missing).
	*
	* READY - Device is operational, but not streaming.
	*
	* RUN - Device is streaming.
	*
	*/
	#define PVR2_STATE_NONE 0
	#define PVR2_STATE_DEAD 1
	#define PVR2_STATE_COLD 2
	#define PVR2_STATE_WARM 3
	#define PVR2_STATE_ERROR 4
	#define PVR2_STATE_READY 5
	#define PVR2_STATE_RUN 6

	/* Translate configuration enum to a string label */
	const char *pvr2_config_get_name(enum pvr2_config);

	struct pvr2_hdw;

	/* Create and return a structure for interacting with the underlying
	hardware */
	struct pvr2_hdw pvr2_hdw_create(struct usb_interface intf,
	const struct usb_device_id *devid);

	/* Perform second stage initialization, passing in a notification callback
	for when the master state changes. */
	int pvr2_hdw_initialize(struct pvr2_hdw *,
	void (callback_func)(void ),
	void *callback_data);

	/* Destroy hardware interaction structure */
	void pvr2_hdw_destroy(struct pvr2_hdw *);

	/* Return true if in the ready (normal) state */
	int pvr2_hdw_dev_ok(struct pvr2_hdw *);

	/* Return small integer number [1..N] for logical instance number of this
	device. This is useful for indexing array-valued module parameters. */
	int pvr2_hdw_get_unit_number(struct pvr2_hdw *);

	/* Get pointer to underlying USB device */
	struct usb_device pvr2_hdw_get_dev(struct pvr2_hdw );

	/* Retrieve serial number of device */
	unsigned long pvr2_hdw_get_sn(struct pvr2_hdw *);

	/* Retrieve bus location info of device */
	const char pvr2_hdw_get_bus_info(struct pvr2_hdw );

	/* Retrieve per-instance string identifier for this specific device */
	const char pvr2_hdw_get_device_identifier(struct pvr2_hdw );

	/* Called when hardware has been unplugged */
	void pvr2_hdw_disconnect(struct pvr2_hdw *);

	/* Get the number of defined controls */
	unsigned int pvr2_hdw_get_ctrl_count(struct pvr2_hdw *);

	/* Retrieve a control handle given its index (0..count-1) */
	struct pvr2_ctrl pvr2_hdw_get_ctrl_by_index(struct pvr2_hdw ,unsigned int);

	/* Retrieve a control handle given its internal ID (if any) */
	struct pvr2_ctrl pvr2_hdw_get_ctrl_by_id(struct pvr2_hdw ,unsigned int);

	/* Retrieve a control handle given its V4L ID (if any) */
	struct pvr2_ctrl pvr2_hdw_get_ctrl_v4l(struct pvr2_hdw ,unsigned int ctl_id);

	/* Retrieve a control handle given its immediate predecessor V4L ID (if any) */
	struct pvr2_ctrl pvr2_hdw_get_ctrl_nextv4l(struct pvr2_hdw ,
	unsigned int ctl_id);

	/* Commit all control changes made up to this point */
	int pvr2_hdw_commit_ctl(struct pvr2_hdw *);

	/* Return a bit mask of valid input selections for this device. Mask bits
	* will be according to PVR_CVAL_INPUT_xxxx definitions. */
	unsigned int pvr2_hdw_get_input_available(struct pvr2_hdw *);

	/* Return a bit mask of allowed input selections for this device. Mask bits
	* will be according to PVR_CVAL_INPUT_xxxx definitions. */
	unsigned int pvr2_hdw_get_input_allowed(struct pvr2_hdw *);

	/* Change the set of allowed input selections for this device. Both
	change_mask and change_valu are mask bits according to
	PVR_CVAL_INPUT_xxxx definitions. The change_mask parameter indicate
	which settings are being changed and the change_val parameter indicates
	whether corresponding settings are being set or cleared. */
	int pvr2_hdw_set_input_allowed(struct pvr2_hdw *,
	unsigned int change_mask,
	unsigned int change_val);

	/* Return name for this driver instance */
	const char pvr2_hdw_get_driver_name(struct pvr2_hdw );

	/* Mark tuner status stale so that it will be re-fetched */
	void pvr2_hdw_execute_tuner_poll(struct pvr2_hdw *);

	/* Return information about the tuner */
	int pvr2_hdw_get_tuner_status(struct pvr2_hdw ,struct v4l2_tuner );

	/* Return information about cropping capabilities */
	int pvr2_hdw_get_cropcap(struct pvr2_hdw , struct v4l2_cropcap );

	/* Query device and see if it thinks it is on a high-speed USB link */
	int pvr2_hdw_is_hsm(struct pvr2_hdw *);

	/* Return a string token representative of the hardware type */
	const char pvr2_hdw_get_type(struct pvr2_hdw );

	/* Return a single line description of the hardware type */
	const char pvr2_hdw_get_desc(struct pvr2_hdw );

	/* Turn streaming on/off */
	int pvr2_hdw_set_streaming(struct pvr2_hdw *,int);

	/* Find out if streaming is on */
	int pvr2_hdw_get_streaming(struct pvr2_hdw *);

	/* Retrieve driver overall state */
	int pvr2_hdw_get_state(struct pvr2_hdw *);

	/* Configure the type of stream to generate */
	int pvr2_hdw_set_stream_type(struct pvr2_hdw *, enum pvr2_config);

	/* Get handle to video output stream */
	struct pvr2_stream pvr2_hdw_get_video_stream(struct pvr2_hdw );

	/* Emit a video standard struct */
	int pvr2_hdw_get_stdenum_value(struct pvr2_hdw hdw,struct v4l2_standard std,
	unsigned int idx);

	/* Enable / disable retrieval of CPU firmware or prom contents. This must
	be enabled before pvr2_hdw_cpufw_get() will function. Note that doing
	this may prevent the device from running (and leaving this mode may
	imply a device reset). */
	void pvr2_hdw_cpufw_set_enabled(struct pvr2_hdw *,
	int mode, /* 0=8KB FX2, 1=16KB FX2, 2=PROM */
	int enable_flag);

	/* Return true if we're in a mode for retrieval CPU firmware */
	int pvr2_hdw_cpufw_get_enabled(struct pvr2_hdw *);

	/* Retrieve a piece of the CPU's firmware at the given offset. Return
	value is the number of bytes retrieved or zero if we're past the end or
	an error otherwise (e.g. if firmware retrieval is not enabled). */
	int pvr2_hdw_cpufw_get(struct pvr2_hdw *,unsigned int offs,
	char *buf,unsigned int cnt);

	/* Retrieve a previously stored v4l minor device number */
	int pvr2_hdw_v4l_get_minor_number(struct pvr2_hdw *,enum pvr2_v4l_type index);

	/* Store a v4l minor device number */
	void pvr2_hdw_v4l_store_minor_number(struct pvr2_hdw *,
	enum pvr2_v4l_type index,int);

	/* Direct read/write access to chip's registers:
	match - specify criteria to identify target chip (this is a v4l dbg struct)
	reg_id - register number to access
	setFl - true to set the register, false to read it
	val_ptr - storage location for source / result. */
	int pvr2_hdw_register_access(struct pvr2_hdw *,
	struct v4l2_dbg_match *match, u64 reg_id,
	int setFl, u64 *val_ptr);

	/* The following entry points are all lower level things you normally don't
	want to worry about. */

	/* Issue a command and get a response from the device. LOTS of higher
	level stuff is built on this. */
	int pvr2_send_request(struct pvr2_hdw *,
	void *write_ptr,unsigned int write_len,
	void *read_ptr,unsigned int read_len);

	/* Slightly higher level device communication functions. */
	int pvr2_write_register(struct pvr2_hdw *, u16, u32);

	/* Call if for any reason we can't talk to the hardware anymore - this will
	cause the driver to stop flailing on the device. */
	void pvr2_hdw_render_useless(struct pvr2_hdw *);

	/* Set / clear 8051's reset bit */
	void pvr2_hdw_cpureset_assert(struct pvr2_hdw *,int);

	/* Execute a USB-commanded device reset */
	void pvr2_hdw_device_reset(struct pvr2_hdw *);

	/* Reset worker's error trapping circuit breaker */
	int pvr2_hdw_untrip(struct pvr2_hdw *);

	/* Execute hard reset command (after this point it's likely that the
	encoder will have to be reconfigured). This also clears the "useless"
	state. */
	int pvr2_hdw_cmd_deep_reset(struct pvr2_hdw *);

	/* Execute simple reset command */
	int pvr2_hdw_cmd_powerup(struct pvr2_hdw *);

	/* suspend */
	int pvr2_hdw_cmd_powerdown(struct pvr2_hdw *);

	/* Order decoder to reset */
	int pvr2_hdw_cmd_decoder_reset(struct pvr2_hdw *);

	/* Direct manipulation of GPIO bits */
	int pvr2_hdw_gpio_get_dir(struct pvr2_hdw hdw,u32 );
	int pvr2_hdw_gpio_get_out(struct pvr2_hdw hdw,u32 );
	int pvr2_hdw_gpio_get_in(struct pvr2_hdw hdw,u32 );
	int pvr2_hdw_gpio_chg_dir(struct pvr2_hdw *hdw,u32 msk,u32 val);
	int pvr2_hdw_gpio_chg_out(struct pvr2_hdw *hdw,u32 msk,u32 val);

	/* This data structure is specifically for the next function... */
	struct pvr2_hdw_debug_info {
	int big_lock_held;
	int ctl_lock_held;
	int flag_disconnected;
	int flag_init_ok;
	int flag_ok;
	int fw1_state;
	int flag_decoder_missed;
	int flag_tripped;
	int state_encoder_ok;
	int state_encoder_run;
	int state_decoder_run;
	int state_decoder_ready;
	int state_usbstream_run;
	int state_decoder_quiescent;
	int state_pipeline_config;
	int state_pipeline_req;
	int state_pipeline_pause;
	int state_pipeline_idle;
	int cmd_debug_state;
	int cmd_debug_write_len;
	int cmd_debug_read_len;
	int cmd_debug_write_pend;
	int cmd_debug_read_pend;
	int cmd_debug_timeout;
	int cmd_debug_rstatus;
	int cmd_debug_wstatus;
	unsigned char cmd_code;
	};

	/* Non-intrusively retrieve internal state info - this is useful for
	diagnosing lockups. Note that this operation is completed without any
	kind of locking and so it is not atomic and may yield inconsistent
	results. This is purely a debugging aid. */
	void pvr2_hdw_get_debug_info_unlocked(const struct pvr2_hdw *hdw,
	struct pvr2_hdw_debug_info *);

	/* Intrusively retrieve internal state info - this is useful for
	diagnosing overall driver state. This operation synchronizes against
	the overall driver mutex - so if there are locking problems this will
	likely hang! This is purely a debugging aid. */
	void pvr2_hdw_get_debug_info_locked(struct pvr2_hdw *hdw,
	struct pvr2_hdw_debug_info *);

	/* Report out several lines of text that describes driver internal state.
	Results are written into the passed-in buffer. */
	unsigned int pvr2_hdw_state_report(struct pvr2_hdw *hdw,
	char *buf_ptr,unsigned int buf_size);

	/* Cause modules to log their state once */
	void pvr2_hdw_trigger_module_log(struct pvr2_hdw *hdw);

	/* Cause encoder firmware to be uploaded into the device. This is normally
	done autonomously, but the interface is exported here because it is also
	a debugging aid. */
	int pvr2_upload_firmware2(struct pvr2_hdw *hdw);

	#endif /* __PVRUSB2_HDW_H */

	/*
	Stuff for Emacs to see, in order to encourage consistent editing style:
	* Local Variables: *
	* mode: c *
	* fill-column: 75 *
	* tab-width: 8 *
	* c-basic-offset: 8 *
	* End: *
	*/