[PATCH] PSX support in input/joystick/gamecon.c
From: Peter Nelson
Date: Fri Feb 06 2004 - 13:11:10 EST
Hi, this is my first kernel hack but it's fairly straight froward. I
did a partial-rewrite of the PSX support in gamecon.c to make it far
more usable. What this patch changes:
* Adds support for more than one controller. Previously more than
one controller was initialized and the docs said they worked, but
only one was actually read.
* Removes unnecessary detection on initialization. This allows the
module to be initialized without controllers plugged in (hot
swapping controllers works). This removes a warning if the user
has an unrecognized controller plugged in, but the only
unrecognized controller I have been able to find information about
online is the PSX mouse, which I've never actually seen.
* Adds a gc_psx_ddr option to have direction presses register as
buttons instead of axes. Allows the module to be used for Dance
Dance Revolution emulators like Stepmania.
* Adds gc_psx_* to documentation.
I've tested this with a dualshock 2, clone digital controller, and DDR
pads. The patch applies against both 2.6.1 and 2.6.2.
-Peter Nelson
--- linux-2.6.2/Documentation/input/joystick-parport.txt.org 2004-02-05 02:25:41.000000000 -0500
+++ linux-2.6.2/Documentation/input/joystick-parport.txt 2004-02-05 02:38:24.000000000 -0500
@@ -453,8 +453,16 @@ uses the following kernel/module command
6 | N64 pad
7 | Sony PSX controller
- The exact type of the PSX controller type is autoprobed, so you must have
-your controller plugged in before initializing.
+ The exact type of the PSX controller type is autoprobed with use so hot
+swapping should work. There are two options specifically for PSX controllers:
+
+ gc_psx_delay=usec
+ The delay time between controller reads, default is 25 usec. Some users have
+ reported improved responsiveness at 10 usec.
+
+ gc_psx_ddr=1
+ Register directions events as buttons instead of axes. Usefull for Dance
+ Dance Revolution emulators so up and down can be pressed at once.
Should you want to use more than one of parallel ports at once, you can use
gc_2 and gc_3 as additional command line parameters for two more parallel
--- linux-2.6.2/drivers/input/joystick/gamecon.c.org 2004-02-06 12:51:14.000000000 -0500
+++ linux-2.6.2/drivers/input/joystick/gamecon.c 2004-02-06 12:52:35.000000000 -0500
@@ -6,6 +6,7 @@
* Based on the work of:
* Andree Borrmann John Dahlstrom
* David Kuder Nathan Hand
+ * Peter Nelson
*/
/*
@@ -47,6 +48,7 @@ MODULE_PARM(gc, "2-6i");
MODULE_PARM(gc_2,"2-6i");
MODULE_PARM(gc_3,"2-6i");
MODULE_PARM(gc_psx_delay, "i");
+MODULE_PARM(gc_psx_ddr, "i");
#define GC_SNES 1
#define GC_NES 2
@@ -224,7 +226,7 @@ static void gc_multi_read_packet(struct
#define GC_PSX_RUMBLE 7 /* Rumble in Red mode */
#define GC_PSX_CLOCK 0x04 /* Pin 4 */
-#define GC_PSX_COMMAND 0x01 /* Pin 1 */
+#define GC_PSX_COMMAND 0x01 /* Pin 2 */
#define GC_PSX_POWER 0xf8 /* Pins 5-9 */
#define GC_PSX_SELECT 0x02 /* Pin 3 */
@@ -232,28 +234,33 @@ static void gc_multi_read_packet(struct
#define GC_PSX_LEN(x) ((x) & 0xf) /* Low nibble is length in words */
static int gc_psx_delay = GC_PSX_DELAY;
+static int gc_psx_ddr = 0;
static short gc_psx_abs[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_HAT0X, ABS_HAT0Y };
static short gc_psx_btn[] = { BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_A, BTN_B, BTN_X, BTN_Y,
BTN_START, BTN_SELECT, BTN_THUMBL, BTN_THUMBR };
+static short gc_psx_ddr_btn[] = { BTN_0, BTN_1, BTN_2, BTN_3 };
/*
* gc_psx_command() writes 8bit command and reads 8bit data from
* the psx pad.
*/
-static int gc_psx_command(struct gc *gc, int b)
+static void gc_psx_command(struct gc *gc, int b, unsigned char data[GC_PSX_LENGTH])
{
- int i, cmd, data = 0;
+ int i, j, cmd, read;
+ for (i = 0; i < 5; i++)
+ data[i] = 0;
for (i = 0; i < 8; i++, b >>= 1) {
cmd = (b & 1) ? GC_PSX_COMMAND : 0;
parport_write_data(gc->pd->port, cmd | GC_PSX_POWER);
udelay(gc_psx_delay);
- data |= ((parport_read_status(gc->pd->port) ^ 0x80) & gc->pads[GC_PSX]) ? (1 << i) : 0;
+ read = parport_read_status(gc->pd->port) ^ 0x80;
+ for (j = 0; j < 5; j++)
+ data[j] |= (read & gc_status_bit[j] & gc->pads[GC_PSX]) ? (1 << i) : 0;
parport_write_data(gc->pd->port, cmd | GC_PSX_CLOCK | GC_PSX_POWER);
udelay(gc_psx_delay);
}
- return data;
}
/*
@@ -261,30 +268,39 @@ static int gc_psx_command(struct gc *gc,
* device identifier code.
*/
-static int gc_psx_read_packet(struct gc *gc, unsigned char *data)
+static void gc_psx_read_packet(struct gc *gc, unsigned char data[5][GC_PSX_LENGTH], unsigned char id[5])
{
- int i, id;
+ int i, j, max_len = 0;
unsigned long flags;
+ unsigned char data2[5];
parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER); /* Select pad */
- udelay(gc_psx_delay * 2);
+ udelay(gc_psx_delay);
parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER); /* Deselect, begin command */
- udelay(gc_psx_delay * 2);
+ udelay(gc_psx_delay);
local_irq_save(flags);
- gc_psx_command(gc, 0x01); /* Access pad */
- id = gc_psx_command(gc, 0x42); /* Get device id */
- if (gc_psx_command(gc, 0) == 0x5a) { /* Okay? */
- for (i = 0; i < GC_PSX_LEN(id) * 2; i++)
- data[i] = gc_psx_command(gc, 0);
- } else id = 0;
+ gc_psx_command(gc, 0x01, data2); /* Access pad */
+ gc_psx_command(gc, 0x42, id); /* Get device ids */
+ gc_psx_command(gc, 0, data2); /* Dump status */
+
+ for (i =0; i < 5; i++) /* Find the longest pad */
+ if((gc_status_bit[i] & gc->pads[GC_PSX]) && (GC_PSX_LEN(id[i]) > max_len))
+ max_len = GC_PSX_LEN(id[i]);
+
+ for (i = 0; i < max_len * 2; i++) { /* Read in all the data */
+ gc_psx_command(gc, 0, data2);
+ for (j = 0; j < 5; j++)
+ data[j][i] = data2[j];
+ }
local_irq_restore(flags);
parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
- return GC_PSX_ID(id);
+ for(i = 0; i < 5; i++) /* Set id's to the real value */
+ id[i] = GC_PSX_ID(id[i]);
}
/*
@@ -298,6 +314,7 @@ static void gc_timer(unsigned long priva
struct gc *gc = (void *) private;
struct input_dev *dev = gc->dev;
unsigned char data[GC_MAX_LENGTH];
+ unsigned char data_psx[5][GC_PSX_LENGTH];
int i, j, s;
/*
@@ -396,51 +413,67 @@ static void gc_timer(unsigned long priva
if (gc->pads[GC_PSX]) {
- for (i = 0; i < 5; i++)
- if (gc->pads[GC_PSX] & gc_status_bit[i])
- break;
-
- switch (gc_psx_read_packet(gc, data)) {
-
- case GC_PSX_RUMBLE:
-
- input_report_key(dev + i, BTN_THUMBL, ~data[0] & 0x04);
- input_report_key(dev + i, BTN_THUMBR, ~data[0] & 0x02);
- input_sync(dev + i);
-
- case GC_PSX_NEGCON:
- case GC_PSX_ANALOG:
-
- for (j = 0; j < 4; j++)
- input_report_abs(dev + i, gc_psx_abs[j], data[j + 2]);
-
- input_report_abs(dev + i, ABS_HAT0X, !(data[0] & 0x20) - !(data[0] & 0x80));
- input_report_abs(dev + i, ABS_HAT0Y, !(data[0] & 0x40) - !(data[0] & 0x10));
-
- for (j = 0; j < 8; j++)
- input_report_key(dev + i, gc_psx_btn[j], ~data[1] & (1 << j));
-
- input_report_key(dev + i, BTN_START, ~data[0] & 0x08);
- input_report_key(dev + i, BTN_SELECT, ~data[0] & 0x01);
-
- input_sync(dev + i);
-
- break;
-
- case GC_PSX_NORMAL:
-
- input_report_abs(dev + i, ABS_X, 128 + !(data[0] & 0x20) * 127 - !(data[0] & 0x80) * 128);
- input_report_abs(dev + i, ABS_Y, 128 + !(data[0] & 0x40) * 127 - !(data[0] & 0x10) * 128);
-
- for (j = 0; j < 8; j++)
- input_report_key(dev + i, gc_psx_btn[j], ~data[1] & (1 << j));
-
- input_report_key(dev + i, BTN_START, ~data[0] & 0x08);
- input_report_key(dev + i, BTN_SELECT, ~data[0] & 0x01);
+ gc_psx_read_packet(gc, data_psx, data);
- input_sync(dev + i);
+ for (i = 0; i < 5; i++) {
+ switch (data[i]) {
+
+ case GC_PSX_RUMBLE:
+
+ input_report_key(dev + i, BTN_THUMBL, ~data_psx[i][0] & 0x04);
+ input_report_key(dev + i, BTN_THUMBR, ~data_psx[i][0] & 0x02);
+ input_sync(dev + i);
+
+ case GC_PSX_NEGCON:
+ case GC_PSX_ANALOG:
+
+ if(gc_psx_ddr == 1) {
+ for(j = 0; j < 4; j++)
+ input_report_key(dev + i, gc_psx_ddr_btn[j], ~data_psx[i][0] & (0x10 << j));
+ } else {
+ for (j = 0; j < 4; j++)
+ input_report_abs(dev + i, gc_psx_abs[j+2], data_psx[i][j + 2]);
+
+ input_report_abs(dev + i, ABS_X, 128 + !(data_psx[i][0] & 0x20) * 127 - !(data_psx[i][0] & 0x80) * 128);
+ input_report_abs(dev + i, ABS_Y, 128 + !(data_psx[i][0] & 0x40) * 127 - !(data_psx[i][0] & 0x10) * 128);
+ }
+
+ for (j = 0; j < 8; j++)
+ input_report_key(dev + i, gc_psx_btn[j], ~data_psx[i][1] & (1 << j));
+
+ input_report_key(dev + i, BTN_START, ~data_psx[i][0] & 0x08);
+ input_report_key(dev + i, BTN_SELECT, ~data_psx[i][0] & 0x01);
+
+ input_sync(dev + i);
+
+ break;
+
+ case GC_PSX_NORMAL:
+ if(gc_psx_ddr == 1) {
+ for(j = 0; j < 4; j++)
+ input_report_key(dev + i, gc_psx_ddr_btn[j], ~data_psx[i][0] & (0x10 << j));
+ } else {
+ input_report_abs(dev + i, ABS_X, 128 + !(data_psx[i][0] & 0x20) * 127 - !(data_psx[i][0] & 0x80) * 128);
+ input_report_abs(dev + i, ABS_Y, 128 + !(data_psx[i][0] & 0x40) * 127 - !(data_psx[i][0] & 0x10) * 128);
+
+ /* for some reason if the extra axes are left unset they drift */
+ for (j = 0; j < 4; j++)
+ input_report_abs(dev + i, gc_psx_abs[j+2], 128);
+ }
+
+ for (j = 0; j < 8; j++)
+ input_report_key(dev + i, gc_psx_btn[j], ~data_psx[i][1] & (1 << j));
+
+ input_report_key(dev + i, BTN_START, ~data_psx[i][0] & 0x08);
+ input_report_key(dev + i, BTN_SELECT, ~data_psx[i][0] & 0x01);
+
+ input_sync(dev + i);
+
+ break;
- break;
+ case 0: /* not a pad, ignore */
+ break;
+ }
}
}
@@ -472,8 +505,7 @@ static struct gc __init *gc_probe(int *c
{
struct gc *gc;
struct parport *pp;
- int i, j, psx;
- unsigned char data[32];
+ int i, j;
if (config[0] < 0)
return NULL;
@@ -562,43 +594,21 @@ static struct gc __init *gc_probe(int *c
break;
case GC_PSX:
-
- psx = gc_psx_read_packet(gc, data);
-
- switch(psx) {
- case GC_PSX_NEGCON:
- case GC_PSX_NORMAL:
- case GC_PSX_ANALOG:
- case GC_PSX_RUMBLE:
-
- for (j = 0; j < 6; j++) {
- psx = gc_psx_abs[j];
- set_bit(psx, gc->dev[i].absbit);
- if (j < 4) {
- gc->dev[i].absmin[psx] = 4;
- gc->dev[i].absmax[psx] = 252;
- gc->dev[i].absflat[psx] = 2;
- } else {
- gc->dev[i].absmin[psx] = -1;
- gc->dev[i].absmax[psx] = 1;
- }
- }
-
- for (j = 0; j < 12; j++)
- set_bit(gc_psx_btn[j], gc->dev[i].keybit);
-
- break;
-
- case 0:
- gc->pads[GC_PSX] &= ~gc_status_bit[i];
- printk(KERN_ERR "gamecon.c: No PSX controller found.\n");
- break;
-
- default:
- gc->pads[GC_PSX] &= ~gc_status_bit[i];
- printk(KERN_WARNING "gamecon.c: Unsupported PSX controller %#x,"
- " please report to <vojtech@xxxxxx>.\n", psx);
+ if(gc_psx_ddr == 1) {
+ for (j = 0; j < 4; j++)
+ set_bit(gc_psx_ddr_btn[j], gc->dev[i].keybit);
+ } else {
+ for (j = 0; j < 6; j++) {
+ set_bit(gc_psx_abs[j], gc->dev[i].absbit);
+ gc->dev[i].absmin[gc_psx_abs[j]] = 4;
+ gc->dev[i].absmax[gc_psx_abs[j]] = 252;
+ gc->dev[i].absflat[gc_psx_abs[j]] = 2;
+ }
}
+
+ for (j = 0; j < 12; j++)
+ set_bit(gc_psx_btn[j], gc->dev[i].keybit);
+
break;
}
@@ -656,10 +666,16 @@ static int __init gc_psx_setup(char *str
get_option(&str, &gc_psx_delay);
return 1;
}
+static int __init gc_psx_ddr(char *str)
+{
+ get_option(&str, &gc_psx_ddr);
+ return 1;
+}
__setup("gc=", gc_setup);
__setup("gc_2=", gc_setup_2);
__setup("gc_3=", gc_setup_3);
__setup("gc_psx_delay=", gc_psx_setup);
+__setup("gc_psx_ddr=", gc_psx_ddr);
#endif
int __init gc_init(void)