ref: 54bac038f411c10a596adf84c06df32f8c7c4c53
dir: /os/ipaq1110/devipaq.c/
/*
* iPAQ H3650 touch screen and other devices
*
* Inferno driver derived from sketchy documentation and
* information gleaned from linux/char/h3650_ts.c
* by Charles Flynn.
*
* Copyright © 2000,2001 Vita Nuova Holdings Limited. All rights reserved.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "keyboard.h"
#include <kernel.h>
#include <draw.h>
#include <memdraw.h>
#include "screen.h"
#define DEBUG 0
/*
* packet format
*
* SOF (0x02)
* (id<<4) | len byte length
* data[len] bytes
* chk checksum mod 256 excluding SOF
*/
enum {
Csof = 0x02,
Ceof = 0x03,
Hdrlen = 3,
/* opcodes */
Oversion = 0,
Okeys = 2,
Otouch = 3,
Ordeeprom = 4,
Owreeprom = 5,
Othermal = 6,
Oled = 8,
Obattery = 9,
Ospiread = 11,
Ospiwrite = 12,
Obacklight = 13,
Oextstatus = 0xA1,
};
enum {
Powerbit = 0, /* GPIO bit for power on/off key */
};
enum{
Qdir,
Qctl,
Qtouchctl,
Qbattery,
Qversion,
};
static
Dirtab ipaqtab[]={
".", {Qdir, 0, QTDIR}, 0, 0555,
"ipaqctl", {Qctl}, 0, 0600,
"battery", {Qbattery}, 0, 0444,
"version", {Qversion}, 0, 0444,
"touchctl", {Qtouchctl}, 0, 0644,
};
static struct {
QLock;
Chan* c;
Lock rl; /* protect cmd, reply */
int cmd;
Block* reply;
Rendez r;
} atmel;
/* to and from fixed point */
#define FX(a,b) (((a)<<16)/(b))
#define XF(v) ((v)>>16)
static struct {
Lock;
int rate;
int m[2][3]; /* transformation matrix */
Point avg;
Point diff;
Point pts[4];
int n; /* number of points in pts */
int p; /* current index in pts */
int down;
int nout;
} touch = {
{0},
.m {{-FX(1,3), 0, FX(346,1)},{0, -FX(1,4), FX(256, 1)}},
};
/*
* map rocker positions to same codes as plan 9
*/
static Rune rockermap[2][4] ={
{Right, Down, Up, Left}, /* landscape */
{Up, Right, Left, Down}, /* portrait */
};
static Rendez powerevent;
static void cmdack(int, void*, int);
static int cmdio(int, void*, int, void*, int);
static void ipaqreadproc(void*);
static void powerwaitproc(void*);
static Block* rdevent(Block**);
static long touchctl(char*, long);
static void touched(Block*, int);
static int wrcmd(int, void*, int, void*, int);
static char* acstatus(int);
static char* batstatus(int);
static void powerintr(Ureg*, void*);
static void
ipaqreset(void)
{
intrenable(Powerbit, powerintr, nil, BusGPIOfalling, "power off");
}
static void
ipaqinit(void)
{
kproc("powerwait", powerwaitproc, nil, 0);
}
static Chan*
ipaqattach(char* spec)
{
int fd;
qlock(&atmel);
if(waserror()){
qunlock(&atmel);
nexterror();
}
if(atmel.c == nil){
fd = kopen("#t/eia1ctl", ORDWR);
if(fd < 0)
error(up->env->errstr);
kwrite(fd, "b115200", 7); /* it's already pn, l8 */
kclose(fd);
fd = kopen("#t/eia1", ORDWR);
if(fd < 0)
error(up->env->errstr);
atmel.c = fdtochan(up->env->fgrp, fd, ORDWR, 0, 1);
kclose(fd);
atmel.cmd = -1;
kproc("ipaqread", ipaqreadproc, nil, 0);
}
poperror();
qunlock(&atmel);
return devattach('T', spec);
}
static Walkqid*
ipaqwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, ipaqtab, nelem(ipaqtab), devgen);
}
static int
ipaqstat(Chan* c, uchar *db, int n)
{
return devstat(c, db, n, ipaqtab, nelem(ipaqtab), devgen);
}
static Chan*
ipaqopen(Chan* c, int omode)
{
return devopen(c, omode, ipaqtab, nelem(ipaqtab), devgen);
}
static void
ipaqclose(Chan*)
{
}
static long
ipaqread(Chan* c, void* a, long n, vlong offset)
{
char *tmp, buf[64];
uchar reply[12];
int v, p, l;
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, a, n, ipaqtab, nelem(ipaqtab), devgen);
case Qtouchctl:
tmp = malloc(READSTR);
if(waserror()){
free(tmp);
nexterror();
}
snprint(tmp, READSTR, "s%d\nr%d\nR%d\nX %d %d %d\nY %d %d %d\n",
1000, 0, 1,
touch.m[0][0], touch.m[0][1], touch.m[0][2],
touch.m[1][0], touch.m[1][1], touch.m[1][2]);
n = readstr(offset, a, n, tmp);
poperror();
free(tmp);
break;
case Qbattery:
cmdio(Obattery, reply, 0, reply, sizeof(reply));
tmp = malloc(READSTR);
if(waserror()){
free(tmp);
nexterror();
}
v = (reply[4]<<8)|reply[3];
p = 425*v/1000 - 298;
snprint(tmp, READSTR, "voltage: %d %dmV %d%% %d\nac: %s\nstatus: %d %s\nchem: %d\n",
v, 1000*v/228, p, 300*p/100, acstatus(reply[1]), reply[5], batstatus(reply[5]), reply[2]);
n = readstr(offset, a, n, tmp);
poperror();
free(tmp);
break;
case Qversion:
l = cmdio(Oversion, reply, 0, reply, sizeof(reply));
if(l > 4){
l--;
memmove(buf, reply+1, 4);
if(l > 8){
buf[4] = ' ';
memmove(buf+5, reply+5, 4); /* pack version */
sprint(buf+9, " %.2x\n", reply[9]); /* ``boot type'' */
}else{
buf[4] = '\n';
buf[5] = 0;
}
return readstr(offset, a, n, buf);
}
n=0;
break;
default:
n=0;
break;
}
return n;
}
static long
ipaqwrite(Chan* c, void* a, long n, vlong)
{
char cmd[64], op[32], *fields[6];
int nf;
switch((ulong)c->qid.path){
case Qctl:
if(n >= sizeof(cmd)-1)
n = sizeof(cmd)-1;
memmove(cmd, a, n);
cmd[n] = 0;
nf = getfields(cmd, fields, nelem(fields), 1, " \t\n");
if(nf <= 0)
error(Ebadarg);
if(nf >= 4 && strcmp(fields[0], "light") == 0){
op[0] = atoi(fields[1]); /* mode */
op[1] = atoi(fields[2]); /* power */
op[2] = atoi(fields[3]); /* brightness */
cmdack(Obacklight, op, 3);
}else if(nf >= 5 && strcmp(fields[0], "led") == 0){
op[0] = atoi(fields[1]);
op[1] = atoi(fields[2]);
op[2] = atoi(fields[3]);
op[3] = atoi(fields[4]);
cmdack(Oled, op, 4);
}else if(strcmp(fields[0], "suspend") == 0){
/* let the kproc do it */
wakeup(&powerevent);
}else
error(Ebadarg);
break;
case Qtouchctl:
return touchctl(a, n);
default:
error(Ebadusefd);
}
return n;
}
static void
powerintr(Ureg*, void*)
{
wakeup(&powerevent);
}
static void
cmdack(int id, void *a, int n)
{
uchar reply[16];
cmdio(id, a, n, reply, sizeof(reply));
}
static int
cmdio(int id, void *a, int n, void *reply, int lim)
{
qlock(&atmel);
if(waserror()){
qunlock(&atmel);
nexterror();
}
n = wrcmd(id, a, n, reply, lim);
poperror();
qunlock(&atmel);
return n;
}
static int
havereply(void*)
{
return atmel.reply != nil;
}
static int
wrcmd(int id, void *a, int n, void *b, int lim)
{
uchar buf[32];
int i, sum;
Block *e;
if(n >= 16)
error(Eio);
lock(&atmel.rl);
atmel.cmd = id;
unlock(&atmel.rl);
buf[0] = Csof;
buf[1] = (id<<4) | (n&0xF);
if(n)
memmove(buf+2, a, n);
sum = 0;
for(i=1; i<n+2; i++)
sum += buf[i];
buf[i++] = sum;
if(0){
iprint("msg=");
for(sum=0; sum<i; sum++)
iprint(" %2.2ux", buf[sum]);
iprint("\n");
}
if(kchanio(atmel.c, buf, i, OWRITE) != i)
error(Eio);
tsleep(&atmel.r, havereply, nil, 500);
lock(&atmel.rl);
e = atmel.reply;
atmel.reply = nil;
atmel.cmd = -1;
unlock(&atmel.rl);
if(e == nil){
print("ipaq: no reply\n");
error(Eio);
}
if(waserror()){
freeb(e);
nexterror();
}
if(e->rp[0] != id){
print("ipaq: rdreply: mismatched reply %d :: %d\n", id, e->rp[0]);
error(Eio);
}
n = BLEN(e);
if(n < lim)
lim = n;
memmove(b, e->rp, lim);
poperror();
freeb(e);
return lim;
}
static void
ipaqreadproc(void*)
{
Block *e, *b, *partial;
int c, mousemod;
while(waserror())
print("ipaqread: %r\n");
partial = nil;
mousemod = 0;
for(;;){
e = rdevent(&partial);
if(e == nil){
print("ipaqread: rdevent: %r\n");
continue;
}
switch(e->rp[0]){
case Otouch:
touched(e, mousemod);
freeb(e);
break;
case Okeys:
//print("key %2.2ux\n", e->rp[1]);
c = e->rp[1] & 0xF;
if(c >= 6 && c < 10){ /* rocker */
if((e->rp[1] & 0x80) == 0){
kbdrepeat(0);
kbdputc(kbdq, rockermap[conf.portrait&1][c-6]);
}else
kbdrepeat(0);
}else{
/* TO DO: change tkmouse and mousetrack to allow extra buttons */
if(--c == 0)
c = 5;
if(e->rp[1] & 0x80)
mousemod &= ~(1<<c);
else
mousemod |= 1<<c;
}
freeb(e);
break;
default:
lock(&atmel.rl);
if(atmel.cmd == e->rp[0]){
b = atmel.reply;
atmel.reply = e;
unlock(&atmel.rl);
wakeup(&atmel.r);
if(b != nil)
freeb(b);
}else{
unlock(&atmel.rl);
print("ipaqread: discard op %d\n", e->rp[0]);
freeb(e);
}
}
}
}
static Block *
rdevent(Block **bp)
{
Block *b, *e;
int s, c, len, csum;
enum {Ssof=16, Sid, Ssum};
s = Ssof;
csum = 0;
len = 0;
e = nil;
if(waserror()){
if(e != nil)
freeb(e);
nexterror();
}
for(;;){
b = *bp;
*bp = nil;
if(b == nil){
b = devtab[atmel.c->type]->bread(atmel.c, 128, 0);
if(b == nil)
error(Eio);
if(DEBUG)
iprint("r: %ld\n", BLEN(b));
}
while(b->rp < b->wp){
c = *b->rp++;
switch(s){
case Ssof:
if(c == Csof)
s = Sid;
else if(1)
iprint("!sof: %2.2ux %d\n", c, s);
break;
case Sid:
csum = c;
len = c & 0xF;
e = allocb(len+1);
if(e == nil)
error(Eio);
*e->wp++ = c>>4; /* id */
if(len)
s = 0;
else
s = Ssum;
break;
case Ssum:
csum &= 0xFF;
if(c != csum){
iprint("cksum: %2.2ux != %2.2ux\n", c, csum);
s = Ssof; /* try to resynchronise */
if(e != nil){
freeb(e);
e = nil;
}
break;
}
if(b->rp < b->wp)
*bp = b;
else
freeb(b);
if(DEBUG){
int i;
iprint("event: [%ld]", BLEN(e));
for(i=0; i<BLEN(e);i++)
iprint(" %2.2ux", e->rp[i]);
iprint("\n");
}
poperror();
return e;
default:
csum += c;
*e->wp++ = c;
if(++s >= len)
s = Ssum;
break;
}
}
freeb(b);
}
return 0; /* not reached */
}
static char *
acstatus(int x)
{
switch(x){
case 0: return "offline";
case 1: return "online";
case 2: return "backup";
}
return "unknown";
}
static char *
batstatus(int x)
{
if(x & 0x40)
return "charging"; /* not in linux but seems to be on mine */
switch(x){
case 0: return "ok";
case 1: return "high";
case 2: return "low";
case 4: return "critical";
case 8: return "charging";
case 0x80: return "none";
}
return "unknown";
}
static int
ptmap(int *m, int x, int y)
{
return XF(m[0]*x + m[1]*y + m[2]);
}
static void
touched(Block *b, int buttons)
{
int rx, ry, x, y, dx, dy, n;
Point op, *lp, cur;
if(BLEN(b) == 5){
/* id Xhi Xlo Yhi Ylo */
if(touch.down < 0){
touch.down = 0;
return;
}
rx = (b->rp[1]<<8)|b->rp[2];
ry = (b->rp[3]<<8)|b->rp[4];
if(conf.portrait){
dx = rx; rx = ry; ry = dx;
}
if(touch.down == 0){
touch.nout = 0;
touch.p = 1;
touch.n = 1;
touch.avg = Pt(rx, ry);
touch.pts[0] = touch.avg;
touch.down = 1;
return;
}
n = touch.p-1;
if(n < 0)
n = nelem(touch.pts)-1;
lp = &touch.pts[n]; /* last point */
if(touch.n > 0 && (rx-lp->x)*(ry-lp->y) > 50*50){ /* far out */
if(++touch.nout > 3){
touch.down = 0;
touch.n = 0;
}
return;
}
op = touch.pts[touch.p];
touch.pts[touch.p] = Pt(rx, ry);
touch.p = (touch.p+1) % nelem(touch.pts);
touch.avg.x += rx;
touch.avg.y += ry;
if(touch.n < nelem(touch.pts)){
touch.n++;
return;
}
touch.avg.x -= op.x;
touch.avg.y -= op.y;
cur = mousexy();
rx = touch.avg.x/touch.n;
ry = touch.avg.y/touch.n;
x = ptmap(touch.m[0], rx, ry);
dx = x-cur.x;
y = ptmap(touch.m[1], rx, ry);
dy = y-cur.y;
if(dx*dx + dy*dy <= 2){
dx = 0;
dy = 0;
}
if(buttons == 0)
buttons = 1<<0; /* by default, stylus down implies button 1 */
mousetrack(buttons&0x1f, dx, dy, 1); /* TO DO: allow more than 3 buttons */
/* TO DO: swcursupdate(oldx, oldy, x, y); */
touch.down = 1;
}else{
if(touch.down){
mousetrack(0, 0, 0, 1); /* stylus up */
touch.down = 0;
}else
touch.down = -1;
touch.n = 0;
touch.p = 0;
touch.avg.x = 0;
touch.avg.y = 0;
}
}
/*
* touchctl commands:
* X a b c - set X transformation
* Y d e f - set Y transformation
* s<delay> - set sample delay in millisec per sample
* r<delay> - set read delay in microsec
* R<l2nr> - set log2 of number of readings to average
*/
static long
touchctl(char* a, long n)
{
char buf[64];
char *cp;
int n0 = n;
int bn;
char *field[8];
int nf, cmd, pn, m[2][3];
while(n) {
bn = (cp = memchr(a, '\n', n))!=nil ? cp-a+1 : n;
n -= bn;
cp = a;
a += bn;
bn = bn > sizeof(buf)-1 ? sizeof(buf)-1 : bn;
memmove(buf, cp, bn);
buf[bn] = '\0';
nf = getfields(buf, field, nelem(field), 1, " \t\n");
if(nf <= 0)
continue;
if(strcmp(field[0], "calibrate") == 0){
if(nf == 1){
lock(&touch);
memset(touch.m, 0, sizeof(touch.m));
touch.m[0][0] = FX(1,1);
touch.m[1][1] = FX(1,1);
unlock(&touch);
}else if(nf >= 5){
memset(m, 0, sizeof(m));
m[0][0] = strtol(field[1], 0, 0);
m[1][1] = strtol(field[2], 0, 0);
m[0][2] = strtol(field[3], 0, 0);
m[1][2] = strtol(field[4], 0, 0);
if(nf > 5)
m[0][1] = strtol(field[5], 0, 0);
if(nf > 6)
m[1][0] = strtol(field[6], 0, 0);
lock(&touch);
memmove(touch.m, m, sizeof(touch.m[0]));
unlock(&touch);
}else
error(Ebadarg);
continue;
}
cmd = *field[0]++;
pn = *field[0] == 0;
switch(cmd) {
case 's':
pn = strtol(field[pn], 0, 0);
if(pn <= 0)
error(Ebadarg);
touch.rate = pn;
break;
case 'r':
/* touch read delay */
break;
case 'X':
case 'Y':
if(nf < pn+2)
error(Ebadarg);
m[0][0] = strtol(field[pn], 0, 0);
m[0][1] = strtol(field[pn+1], 0, 0);
m[0][2] = strtol(field[pn+2], 0, 0);
lock(&touch);
memmove(touch.m[cmd=='Y'], m[0], sizeof(touch.m[0]));
unlock(&touch);
break;
default:
error(Ebadarg);
}
}
return n0-n;
}
/*
* this might belong elsewhere
*/
static int
powerwait(void*)
{
return (GPIOREG->gplr & GPIO_PWR_ON_i) == 0;
}
static void
powerwaitproc(void*)
{
for(;;){
sleep(&powerevent, powerwait, nil);
do{
tsleep(&up->sleep, return0, nil, 50);
}while((GPIOREG->gplr & GPIO_PWR_ON_i) == 0);
powersuspend();
}
}
Dev ipaqdevtab = {
'T',
"ipaq",
ipaqreset,
ipaqinit,
devshutdown,
ipaqattach,
ipaqwalk,
ipaqstat,
ipaqopen,
devcreate,
ipaqclose,
ipaqread,
devbread,
ipaqwrite,
devbwrite,
devremove,
devwstat,
};