From bdff7d84ef1f18f8af9d9e6fa6150a0b3412517b Mon Sep 17 00:00:00 2001
From: Martin Piatka <piatka@cesnet.cz>
Date: Thu, 15 Sep 2022 16:18:11 +0200
Subject: [PATCH] Add volume-knob helper
---
volume-knob-powermate-1.0/Makefile | 13 +++
volume-knob-powermate-1.0/README.md | 9 ++
volume-knob-powermate-1.0/findpowermate.c | 57 +++++++++++
volume-knob-powermate-1.0/findpowermate.h | 7 ++
volume-knob-powermate-1.0/pulseled.c | 114 ++++++++++++++++++++++
volume-knob-powermate-1.0/rotomatic.c | 100 +++++++++++++++++++
6 files changed, 300 insertions(+)
create mode 100644 volume-knob-powermate-1.0/Makefile
create mode 100644 volume-knob-powermate-1.0/README.md
create mode 100644 volume-knob-powermate-1.0/findpowermate.c
create mode 100644 volume-knob-powermate-1.0/findpowermate.h
create mode 100644 volume-knob-powermate-1.0/pulseled.c
create mode 100644 volume-knob-powermate-1.0/rotomatic.c
diff --git a/volume-knob-powermate-1.0/Makefile b/volume-knob-powermate-1.0/Makefile
new file mode 100644
index 0000000..bf4e74a
--- /dev/null
+++ b/volume-knob-powermate-1.0/Makefile
@@ -0,0 +1,13 @@
+all: rotomatic pulseled
+
+rotomatic: rotomatic.o findpowermate.o
+ $(CC) findpowermate.o rotomatic.o -o rotomatic -lxdo
+
+pulseled: pulseled.o findpowermate.o
+ $(CC) findpowermate.o pulseled.o -o pulseled
+
+clean:
+ rm -f *.o *~ rotomatic pulseled
+
+%.o: %.c
+ $(CC) -O2 -Wall -c $< -o $@
diff --git a/volume-knob-powermate-1.0/README.md b/volume-knob-powermate-1.0/README.md
new file mode 100644
index 0000000..7f43776
--- /dev/null
+++ b/volume-knob-powermate-1.0/README.md
@@ -0,0 +1,9 @@
+Tools to support the Griffin powermate volume knob
+
+The source was taken from https://sowerbutts.com/powermate/ and modified to
+send mouse scroll wheel events.
+
+Run rotomatic with the input device path as an argument.
+```
+./rotomatic /dev/input/event<num>
+```
diff --git a/volume-knob-powermate-1.0/findpowermate.c b/volume-knob-powermate-1.0/findpowermate.c
new file mode 100644
index 0000000..9e0e251
--- /dev/null
+++ b/volume-knob-powermate-1.0/findpowermate.c
@@ -0,0 +1,57 @@
+#include <linux/input.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "findpowermate.h"
+
+#define NUM_VALID_PREFIXES 2
+
+static const char *valid_prefix[NUM_VALID_PREFIXES] = {
+ "Griffin PowerMate",
+ "Griffin SoundKnob"
+};
+
+#define NUM_EVENT_DEVICES 16
+
+int open_powermate(const char *dev, int mode)
+{
+ int fd = open(dev, mode);
+ int i;
+ char name[255];
+
+ if(fd < 0){
+ fprintf(stderr, "Unable to open \"%s\": %s\n", dev, strerror(errno));
+ return -1;
+ }
+
+ if(ioctl(fd, EVIOCGNAME(sizeof(name)), name) < 0){
+ fprintf(stderr, "\"%s\": EVIOCGNAME failed: %s\n", dev, strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ // it's the correct device if the prefix matches what we expect it to be:
+ for(i=0; i<NUM_VALID_PREFIXES; i++)
+ if(!strncasecmp(name, valid_prefix[i], strlen(valid_prefix[i])))
+ return fd;
+
+ close(fd);
+ return -1;
+}
+
+int find_powermate(int mode)
+{
+ char devname[256];
+ int i, r;
+
+ for(i=0; i<NUM_EVENT_DEVICES; i++){
+ sprintf(devname, "/dev/input/event%d", i);
+ r = open_powermate(devname, mode);
+ if(r >= 0)
+ return r;
+ }
+
+ return -1;
+}
diff --git a/volume-knob-powermate-1.0/findpowermate.h b/volume-knob-powermate-1.0/findpowermate.h
new file mode 100644
index 0000000..2cf6f9b
--- /dev/null
+++ b/volume-knob-powermate-1.0/findpowermate.h
@@ -0,0 +1,7 @@
+#ifndef __FIND_POWERMATE__DOT_H__SENTRY__
+#define __FIND_POWERMATE__DOT_H__SENTRY__
+
+int open_powermate(const char *dev, int mode);
+int find_powermate(int mode);
+
+#endif
diff --git a/volume-knob-powermate-1.0/pulseled.c b/volume-knob-powermate-1.0/pulseled.c
new file mode 100644
index 0000000..b3b7477
--- /dev/null
+++ b/volume-knob-powermate-1.0/pulseled.c
@@ -0,0 +1,114 @@
+#include <linux/input.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include "findpowermate.h"
+
+#ifndef MSC_PULSELED
+/* this may not have made its way into the kernel headers yet ... */
+#define MSC_PULSELED 0x01
+#endif
+
+void powermate_pulse_led(int fd, int static_brightness, int pulse_speed, int pulse_table, int pulse_asleep, int pulse_awake)
+{
+ struct input_event ev;
+ memset(&ev, 0, sizeof(struct input_event));
+
+ static_brightness &= 0xFF;
+
+ if(pulse_speed < 0)
+ pulse_speed = 0;
+ if(pulse_speed > 510)
+ pulse_speed = 510;
+ if(pulse_table < 0)
+ pulse_table = 0;
+ if(pulse_table > 2)
+ pulse_table = 2;
+ pulse_asleep = !!pulse_asleep;
+ pulse_awake = !!pulse_awake;
+
+ ev.type = EV_MSC;
+ ev.code = MSC_PULSELED;
+ ev.value = static_brightness | (pulse_speed << 8) | (pulse_table << 17) | (pulse_asleep << 19) | (pulse_awake << 20);
+
+ if(write(fd, &ev, sizeof(struct input_event)) != sizeof(struct input_event))
+ fprintf(stderr, "write(): %s\n", strerror(errno));
+}
+
+void usage(void)
+{
+ printf("Usage:\n");
+ printf("pulseled [options]\n");
+ printf("\t--device [filename]\tEvent device to use\n");
+ printf("\t--level [level] \tLED intensity with pulsing disabled (0-255)\n");
+ printf("\t--speed [rate] \tPulsing speed (0-510); around 255 works best\n");
+ printf("\t--style [style] \tPulsing style (0, 1 or 2)\n");
+ printf("\t--pulseawake \tEnable pulsing whilst host is awake\n");
+ printf("\t--nopulseawake \tDisable pulsing whilst host is awake\n");
+ printf("\t--pulseasleep \tEnable pulsing whilst host is asleep\n");
+ printf("\t--nopulseasleep \tDisable pulsing whilst host is asleep\n");
+}
+
+#define TAKE_NEXT_ARG {if(++args_processed >= argc){fprintf(stderr, "Missing argument to %s!\n", argv[args_processed-1]);return 1;}}
+
+int main(int argc, char *argv[])
+{
+ int powermate = -1;
+ int args_processed = 1;
+ int static_brightness = 0x80;
+ int pulse_speed = 255;
+ int pulse_table = 0;
+ int pulse_asleep = 1;
+ int pulse_awake = 0;
+
+ const char *device = 0;
+
+ while(args_processed < argc){
+ if(!strcasecmp(argv[args_processed], "--device")){
+ TAKE_NEXT_ARG;
+ device = argv[args_processed];
+ }else if(!strcasecmp(argv[args_processed], "--level")){
+ TAKE_NEXT_ARG;
+ static_brightness = atoi(argv[args_processed]);
+ }else if(!strcasecmp(argv[args_processed], "--speed")){
+ TAKE_NEXT_ARG;
+ pulse_speed = atoi(argv[args_processed]);
+ }else if(!strcasecmp(argv[args_processed], "--style")){
+ TAKE_NEXT_ARG;
+ pulse_table = atoi(argv[args_processed]);
+ }else if(!strcasecmp(argv[args_processed], "--pulseawake")){
+ pulse_awake = 1;
+ }else if(!strcasecmp(argv[args_processed], "--pulseasleep")){
+ pulse_asleep = 1;
+ }else if(!strcasecmp(argv[args_processed], "--nopulseawake")){
+ pulse_awake = 0;
+ }else if(!strcasecmp(argv[args_processed], "--nopulseasleep")){
+ pulse_asleep = 0;
+ }else{
+ usage();
+ return 1;
+ }
+
+ args_processed++;
+ }
+
+ if(device)
+ powermate = open_powermate(device, O_WRONLY);
+ else
+ powermate = find_powermate(O_WRONLY);
+
+ if(powermate < 0){
+ fprintf(stderr, "Unable to locate powermate\n");
+ fprintf(stderr, "Try: %s [device]\n", argv[0]);
+ return 1;
+ }
+
+ powermate_pulse_led(powermate, static_brightness, pulse_speed, pulse_table, pulse_asleep, pulse_awake);
+
+ close(powermate);
+
+ return 0;
+}
diff --git a/volume-knob-powermate-1.0/rotomatic.c b/volume-knob-powermate-1.0/rotomatic.c
new file mode 100644
index 0000000..dbf5b56
--- /dev/null
+++ b/volume-knob-powermate-1.0/rotomatic.c
@@ -0,0 +1,100 @@
+#include <linux/input.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <xdo.h>
+#include "findpowermate.h"
+
+int abs_offset = 0;
+
+xdo_t *x_ctx = NULL;
+
+void process_event(struct input_event *ev)
+{
+#ifdef VERBOSE
+ fprintf(stderr, "type=0x%04x, code=0x%04x, value=%d\n",
+ ev->type, ev->code, (int)ev->value);
+#endif
+
+ switch(ev->type){
+ case EV_MSC:
+ printf("The LED pulse settings were changed; code=0x%04x, value=0x%08x\n", ev->code, ev->value);
+ break;
+ case EV_REL:
+ if(ev->code != REL_DIAL)
+ fprintf(stderr, "Warning: unexpected rotation event; ev->code = 0x%04x\n", ev->code);
+ else{
+ abs_offset += (int)ev->value;
+ printf("Button was rotated %d units; Offset from start is now %d units\n", (int)ev->value, abs_offset);
+ for(int i = (int) ev->value; i > 0; i--){
+ xdo_mouse_down(x_ctx, CURRENTWINDOW, 5);
+ xdo_mouse_up(x_ctx, CURRENTWINDOW, 5);
+ }
+ for(int i = (int) ev->value; i < 0; i++){
+ xdo_mouse_down(x_ctx, CURRENTWINDOW, 4);
+ xdo_mouse_up(x_ctx, CURRENTWINDOW, 4);
+ }
+ }
+ break;
+ case EV_KEY:
+ if(ev->code != BTN_0)
+ fprintf(stderr, "Warning: unexpected key event; ev->code = 0x%04x\n", ev->code);
+ else
+ printf("Button was %s\n", ev->value? "pressed":"released");
+ break;
+ default:
+ fprintf(stderr, "Warning: unexpected event type; ev->type = 0x%04x\n", ev->type);
+ }
+
+ fflush(stdout);
+}
+
+#define BUFFER_SIZE 32
+void watch_powermate(int fd)
+{
+ struct input_event ibuffer[BUFFER_SIZE];
+ int r, events, i;
+
+ while(1){
+ r = read(fd, ibuffer, sizeof(struct input_event) * BUFFER_SIZE);
+ if( r > 0 ){
+ events = r / sizeof(struct input_event);
+ for(i=0; i<events; i++)
+ process_event(&ibuffer[i]);
+ }else{
+ fprintf(stderr, "read() failed: %s\n", strerror(errno));
+ return;
+ }
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ int powermate = -1;
+
+ if(argc == 1)
+ powermate = find_powermate(O_RDONLY);
+ else
+ powermate = open_powermate(argv[1], O_RDONLY);
+
+ if(powermate < 0){
+ fprintf(stderr, "Unable to locate powermate\n");
+ fprintf(stderr, "Try: %s [device]\n", argv[0]);
+ return 1;
+ }
+
+ x_ctx = xdo_new(NULL);
+ if(!x_ctx){
+ printf("Unable to init xdo\n");
+ close(powermate);
+ return -1;
+ }
+
+ watch_powermate(powermate);
+
+ close(powermate);
+
+ return 0;
+}
--
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