Patchwork Elo touchpad 10 bytes emulator

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Submitter Ricardo Ribalda
Date March 29, 2010, 3:32 p.m.
Message ID <1269876731-22607-1-git-send-email-ricardo.ribalda@gmail.com>
Download mbox | patch
Permalink /patch/48870/
State New
Headers show

Comments

Ricardo Ribalda - March 29, 2010, 3:32 p.m.
New char device emulating an Elo serial touchpad.

TODO: The output of the touchpad should be in the range of the
resolution. But I don't know a clean way to get the screen resolution.
Any help will be very wellcomed
---

Please. Ignore the old 01/10


 Makefile.objs   |    2 +-
 hw/elo.c        |   95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/elo.h        |    2 +
 qemu-char.c     |    3 ++
 qemu-options.hx |    5 ++-
 5 files changed, 105 insertions(+), 2 deletions(-)
 create mode 100644 hw/elo.c
 create mode 100644 hw/elo.h
Paul Brook - March 29, 2010, 3:57 p.m.
> New char device emulating an Elo serial touchpad.
> 
> TODO: The output of the touchpad should be in the range of the
> resolution. But I don't know a clean way to get the screen resolution.
> Any help will be very wellcomed

Are you sure? I don't see how real hardware would be able to do that.

Paul
Dmitry Zhurikhin - March 29, 2010, 5:59 p.m.
Ricardo Ribalda Delgado wrote:
> TODO: The output of the touchpad should be in the range of the
> resolution. But I don't know a clean way to get the screen resolution.
> Any help will be very wellcomed
Hello.  Looking at the Linux kernel driver it seems to consider reported 
coordinates to be in the range of 96-4000.  So you might try to convert 
QEMU absolute coordinates 0-0x7FFF to these ones and check if it works.  
Hope this helps you.


        Regards,
        Dmitry
Ricardo Ribalda - March 29, 2010, 6:51 p.m.
Hello Paul

Hmmm, you are right, it should be part of the calibration (userland).
As Dmtry says, the output from the chip should be from 96-4000. I have
fixed the max values to that.

The previous code was done to emulate an old privative app that uses
an elo touchscreen. I managed to reverse engineer the code and found
the 10 bytes protocol it was using. It also uses a privative library
to talk with the touchscreen.

Digging in the kernel, I found more of the protocol specification, and
digging a little bit more in the internet I have found even more
information.

Please take a look to the last patch and tell me what do you think



       Best regards and thanks for your comments.

On Mon, Mar 29, 2010 at 17:57, Paul Brook <paul@codesourcery.com> wrote:
>> New char device emulating an Elo serial touchpad.
>>
>> TODO: The output of the touchpad should be in the range of the
>> resolution. But I don't know a clean way to get the screen resolution.
>> Any help will be very wellcomed
>
> Are you sure? I don't see how real hardware would be able to do that.
>
> Paul
>

Patch

diff --git a/Makefile.objs b/Makefile.objs
index b73e2cb..07c2e68 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -75,7 +75,7 @@  common-obj-y += bt.o bt-host.o bt-vhci.o bt-l2cap.o bt-sdp.o bt-hci.o bt-hid.o u
 common-obj-y += bt-hci-csr.o
 common-obj-y += buffered_file.o migration.o migration-tcp.o qemu-sockets.o
 common-obj-y += qemu-char.o savevm.o #aio.o
-common-obj-y += msmouse.o ps2.o
+common-obj-y += msmouse.o ps2.o elo.o
 common-obj-y += qdev.o qdev-properties.o
 common-obj-y += qemu-config.o block-migration.o
 
diff --git a/hw/elo.c b/hw/elo.c
new file mode 100644
index 0000000..c79a8db
--- /dev/null
+++ b/hw/elo.c
@@ -0,0 +1,95 @@ 
+/*
+ * QEMU ELO Touchpad via serial port
+ *
+ * Copyright (c) 2010 Ricardo Ribalda: QTechnology http://qtec.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdlib.h>
+#include "../qemu-common.h"
+#include "../qemu-char.h"
+#include "../console.h"
+#include "elo.h"
+
+static void elo_event(void *opaque,
+                          int ax, int ay, int az, int buttons_state)
+{
+    CharDriverState *chr = (CharDriverState *)opaque;
+
+    unsigned char bytes[10];
+    static int is_down=0;
+    /*Only 1 button is supported*/
+    buttons_state&=1;
+
+    /*A touchpad cannot capture flight events*/
+    if ((!is_down)&&(!buttons_state))
+	    return;
+
+    /*Move event*/
+    if (is_down&&buttons_state){
+	    bytes[2]=0x2;
+    }
+
+    /*Click*/
+    if ((!is_down)&&buttons_state){
+	    bytes[2]=0x1;
+	    is_down=1;
+    }
+    /*Release*/
+    if (is_down&&(!buttons_state)){
+	    bytes[2]=0x4;
+	    is_down=0;
+    }
+
+    bytes[0]=0x55;
+    bytes[1]=0x54;
+    bytes[3]=ax&0xff;
+    bytes[4]=(ax>>8)&0xff;
+    bytes[5]=ay&0xff;
+    bytes[6]=(ay>>8)&0xff;
+    bytes[7]=0x0;
+    bytes[8]=0x0;
+    bytes[9]=0x0;
+
+    qemu_chr_read(chr, bytes, 10);
+}
+
+static int elo_chr_write (struct CharDriverState *s, const uint8_t *buf, int len)
+{
+    /* Ignore writes to mouse port */
+    return len;
+}
+
+static void elo_chr_close (struct CharDriverState *chr)
+{
+    qemu_free (chr);
+}
+
+CharDriverState *qemu_chr_open_elo(QemuOpts *opts)
+{
+    CharDriverState *chr;
+
+    chr = qemu_mallocz(sizeof(CharDriverState));
+    chr->chr_write = elo_chr_write;
+    chr->chr_close = elo_chr_close;
+
+    qemu_add_mouse_event_handler(elo_event, chr, 1, "QEMU Elo Touchpad");
+
+    return chr;
+}
diff --git a/hw/elo.h b/hw/elo.h
new file mode 100644
index 0000000..4b4e09a
--- /dev/null
+++ b/hw/elo.h
@@ -0,0 +1,2 @@ 
+/* elo.c */
+CharDriverState *qemu_chr_open_elo(QemuOpts *opts);
diff --git a/qemu-char.c b/qemu-char.c
index 40cfefa..2f95767 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -32,6 +32,7 @@ 
 #include "hw/usb.h"
 #include "hw/baum.h"
 #include "hw/msmouse.h"
+#include "hw/elo.h"
 #include "qemu-objects.h"
 
 #include <unistd.h>
@@ -2278,6 +2279,7 @@  QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
     if (strcmp(filename, "null")    == 0 ||
         strcmp(filename, "pty")     == 0 ||
         strcmp(filename, "msmouse") == 0 ||
+        strcmp(filename, "elo") == 0 ||
         strcmp(filename, "braille") == 0 ||
         strcmp(filename, "stdio")   == 0) {
         qemu_opt_set(opts, "backend", filename);
@@ -2391,6 +2393,7 @@  static const struct {
     { .name = "socket",    .open = qemu_chr_open_socket },
     { .name = "udp",       .open = qemu_chr_open_udp },
     { .name = "msmouse",   .open = qemu_chr_open_msmouse },
+    { .name = "elo",       .open = qemu_chr_open_elo },
     { .name = "vc",        .open = text_console_init },
 #ifdef _WIN32
     { .name = "file",      .open = qemu_chr_open_win_file_out },
diff --git a/qemu-options.hx b/qemu-options.hx
index 7c33736..7ee62cb 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1183,7 +1183,7 @@  DEF("chardev", HAS_ARG, QEMU_OPTION_chardev,
     "-chardev socket,id=id,path=path[,server][,nowait][,telnet] (unix)\n"
     "-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n"
     "         [,localport=localport][,ipv4][,ipv6]\n"
-    "-chardev msmouse,id=id\n"
+    "-chardev elo,id=id\n"
     "-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]\n"
     "-chardev file,id=id,path=path\n"
     "-chardev pipe,id=id,path=path\n"
@@ -1650,6 +1650,9 @@  or fake device.
 
 @item msmouse
 Three button serial mouse. Configure the guest to use Microsoft protocol.
+
+@item elo
+Elo Touchpad 10bytes emulator.
 @end table
 ETEXI