Input: create a book with Linux Input documentation

Now that all files under Documentation/input follows the ReST markup
language, rename them to *.rst and create a book for the Linux Input
subsystem.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 0 insertions, 326 deletions

diff --git a/Documentation/input/joystick-api.txt b/Documentation/input/joystick-api.txt
deleted file mode 100644
index 9b9d26833086..000000000000
--- a/Documentation/input/joystick-api.txt
+++ /dev/null
@@ -1,326 +0,0 @@
-==========================
-Joystick API Documentation
-==========================
-
-:Author: Ragnar Hojland Espinosa <ragnar@macula.net> - 7 Aug 1998
-
-Initialization
-==============
-
-Open the joystick device following the usual semantics (that is, with open).
-Since the driver now reports events instead of polling for changes,
-immediately after the open it will issue a series of synthetic events
-(JS_EVENT_INIT) that you can read to check the initial state of the
-joystick.
-
-By default, the device is opened in blocking mode::
-
-	int fd = open ("/dev/input/js0", O_RDONLY);
-
-
-Event Reading
-=============
-
-::
-
-	struct js_event e;
-	read (fd, &e, sizeof(e));
-
-where js_event is defined as::
-
-	struct js_event {
-		__u32 time;     /* event timestamp in milliseconds */
-		__s16 value;    /* value */
-		__u8 type;      /* event type */
-		__u8 number;    /* axis/button number */
-	};
-
-If the read is successful, it will return sizeof(e), unless you wanted to read
-more than one event per read as described in section 3.1.
-
-
-js_event.type
--------------
-
-The possible values of ``type`` are::
-
-	#define JS_EVENT_BUTTON         0x01    /* button pressed/released */
-	#define JS_EVENT_AXIS           0x02    /* joystick moved */
-	#define JS_EVENT_INIT           0x80    /* initial state of device */
-
-As mentioned above, the driver will issue synthetic JS_EVENT_INIT ORed
-events on open. That is, if it's issuing a INIT BUTTON event, the
-current type value will be::
-
-	int type = JS_EVENT_BUTTON | JS_EVENT_INIT;	/* 0x81 */
-
-If you choose not to differentiate between synthetic or real events
-you can turn off the JS_EVENT_INIT bits::
-
-	type &= ~JS_EVENT_INIT;				/* 0x01 */
-
-
-js_event.number
----------------
-
-The values of ``number`` correspond to the axis or button that
-generated the event. Note that they carry separate numeration (that
-is, you have both an axis 0 and a button 0). Generally,
-
-        =============== =======
-	Axis		number
-        =============== =======
-	1st Axis X	0
-	1st Axis Y	1
-	2nd Axis X	2
-	2nd Axis Y	3
-	...and so on
-        =============== =======
-
-Hats vary from one joystick type to another. Some can be moved in 8
-directions, some only in 4, The driver, however, always reports a hat as two
-independent axis, even if the hardware doesn't allow independent movement.
-
-
-js_event.value
---------------
-
-For an axis, ``value`` is a signed integer between -32767 and +32767
-representing the position of the joystick along that axis. If you
-don't read a 0 when the joystick is ``dead``, or if it doesn't span the
-full range, you should recalibrate it (with, for example, jscal).
-
-For a button, ``value`` for a press button event is 1 and for a release
-button event is 0.
-
-Though this::
-
-	if (js_event.type == JS_EVENT_BUTTON) {
-		buttons_state ^= (1 << js_event.number);
-	}
-
-may work well if you handle JS_EVENT_INIT events separately,
-
-::
-
-	if ((js_event.type & ~JS_EVENT_INIT) == JS_EVENT_BUTTON) {
-		if (js_event.value)
-			buttons_state |= (1 << js_event.number);
-		else
-			buttons_state &= ~(1 << js_event.number);
-	}
-
-is much safer since it can't lose sync with the driver. As you would
-have to write a separate handler for JS_EVENT_INIT events in the first
-snippet, this ends up being shorter.
-
-
-js_event.time
--------------
-
-The time an event was generated is stored in ``js_event.time``. It's a time
-in milliseconds since ... well, since sometime in the past.  This eases the
-task of detecting double clicks, figuring out if movement of axis and button
-presses happened at the same time, and similar.
-
-
-Reading
-=======
-
-If you open the device in blocking mode, a read will block (that is,
-wait) forever until an event is generated and effectively read. There
-are two alternatives if you can't afford to wait forever (which is,
-admittedly, a long time;)
-
-	a) use select to wait until there's data to be read on fd, or
-	   until it timeouts. There's a good example on the select(2)
-	   man page.
-
-	b) open the device in non-blocking mode (O_NONBLOCK)
-
-
-O_NONBLOCK
-----------
-
-If read returns -1 when reading in O_NONBLOCK mode, this isn't
-necessarily a "real" error (check errno(3)); it can just mean there
-are no events pending to be read on the driver queue. You should read
-all events on the queue (that is, until you get a -1).
-
-For example,
-
-::
-
-	while (1) {
-		while (read (fd, &e, sizeof(e)) > 0) {
-			process_event (e);
-		}
-		/* EAGAIN is returned when the queue is empty */
-		if (errno != EAGAIN) {
-			/* error */
-		}
-		/* do something interesting with processed events */
-	}
-
-One reason for emptying the queue is that if it gets full you'll start
-missing events since the queue is finite, and older events will get
-overwritten.
-
-The other reason is that you want to know all what happened, and not
-delay the processing till later.
-
-Why can get the queue full? Because you don't empty the queue as
-mentioned, or because too much time elapses from one read to another
-and too many events to store in the queue get generated. Note that
-high system load may contribute to space those reads even more.
-
-If time between reads is enough to fill the queue and lose an event,
-the driver will switch to startup mode and next time you read it,
-synthetic events (JS_EVENT_INIT) will be generated to inform you of
-the actual state of the joystick.
-
-
-.. note::
-
- As for version 1.2.8, the queue is circular and able to hold 64
- events. You can increment this size bumping up JS_BUFF_SIZE in
- joystick.h and recompiling the driver.
-
-
-In the above code, you might as well want to read more than one event
-at a time using the typical read(2) functionality. For that, you would
-replace the read above with something like::
-
-	struct js_event mybuffer[0xff];
-	int i = read (fd, mybuffer, sizeof(mybuffer));
-
-In this case, read would return -1 if the queue was empty, or some
-other value in which the number of events read would be i /
-sizeof(js_event)  Again, if the buffer was full, it's a good idea to
-process the events and keep reading it until you empty the driver queue.
-
-
-IOCTLs
-======
-
-The joystick driver defines the following ioctl(2) operations::
-
-				/* function			3rd arg  */
-	#define JSIOCGAXES	/* get number of axes		char	 */
-	#define JSIOCGBUTTONS	/* get number of buttons	char	 */
-	#define JSIOCGVERSION	/* get driver version		int	 */
-	#define JSIOCGNAME(len) /* get identifier string	char	 */
-	#define JSIOCSCORR	/* set correction values	&js_corr */
-	#define JSIOCGCORR	/* get correction values	&js_corr */
-
-For example, to read the number of axes::
-
-	char number_of_axes;
-	ioctl (fd, JSIOCGAXES, &number_of_axes);
-
-
-JSIOGCVERSION
--------------
-
-JSIOGCVERSION is a good way to check in run-time whether the running
-driver is 1.0+ and supports the event interface. If it is not, the
-IOCTL will fail. For a compile-time decision, you can test the
-JS_VERSION symbol::
-
-	#ifdef JS_VERSION
-	#if JS_VERSION > 0xsomething
-
-
-JSIOCGNAME
-----------
-
-JSIOCGNAME(len) allows you to get the name string of the joystick - the same
-as is being printed at boot time. The 'len' argument is the length of the
-buffer provided by the application asking for the name. It is used to avoid
-possible overrun should the name be too long::
-
-	char name[128];
-	if (ioctl(fd, JSIOCGNAME(sizeof(name)), name) < 0)
-		strncpy(name, "Unknown", sizeof(name));
-	printf("Name: %s\n", name);
-
-
-JSIOC[SG]CORR
--------------
-
-For usage on JSIOC[SG]CORR I suggest you to look into jscal.c  They are
-not needed in a normal program, only in joystick calibration software
-such as jscal or kcmjoy. These IOCTLs and data types aren't considered
-to be in the stable part of the API, and therefore may change without
-warning in following releases of the driver.
-
-Both JSIOCSCORR and JSIOCGCORR expect &js_corr to be able to hold
-information for all axis. That is, struct js_corr corr[MAX_AXIS];
-
-struct js_corr is defined as::
-
-	struct js_corr {
-		__s32 coef[8];
-		__u16 prec;
-		__u16 type;
-	};
-
-and ``type``::
-
-	#define JS_CORR_NONE            0x00    /* returns raw values */
-	#define JS_CORR_BROKEN          0x01    /* broken line */
-
-
-Backward compatibility
-======================
-
-The 0.x joystick driver API is quite limited and its usage is deprecated.
-The driver offers backward compatibility, though. Here's a quick summary::
-
-	struct JS_DATA_TYPE js;
-	while (1) {
-		if (read (fd, &js, JS_RETURN) != JS_RETURN) {
-			/* error */
-		}
-		usleep (1000);
-	}
-
-As you can figure out from the example, the read returns immediately,
-with the actual state of the joystick::
-
-	struct JS_DATA_TYPE {
-		int buttons;    /* immediate button state */
-		int x;          /* immediate x axis value */
-		int y;          /* immediate y axis value */
-	};
-
-and JS_RETURN is defined as::
-
-	#define JS_RETURN       sizeof(struct JS_DATA_TYPE)
-
-To test the state of the buttons,
-
-::
-
-	first_button_state  = js.buttons & 1;
-	second_button_state = js.buttons & 2;
-
-The axis values do not have a defined range in the original 0.x driver,
-except for that the values are non-negative. The 1.2.8+ drivers use a
-fixed range for reporting the values, 1 being the minimum, 128 the
-center, and 255 maximum value.
-
-The v0.8.0.2 driver also had an interface for 'digital joysticks', (now
-called Multisystem joysticks in this driver), under /dev/djsX. This driver
-doesn't try to be compatible with that interface.
-
-
-Final Notes
-===========
-
-::
-
-  ____/|	Comments, additions, and specially corrections are welcome.
-  \ o.O|	Documentation valid for at least version 1.2.8 of the joystick
-   =(_)=	driver and as usual, the ultimate source for documentation is
-     U		to "Use The Source Luke" or, at your convenience, Vojtech ;)