1 files changed, 163 insertions, 0 deletions
diff --git a/tools/arch/x86/dell-uart-backlight-emulator/dell-uart-backlight-emulator.c b/tools/arch/x86/dell-uart-backlight-emulator/dell-uart-backlight-emulator.c
new file mode 100644
index 000000000000..655b6c96d8cf
--- /dev/null
+++ b/tools/arch/x86/dell-uart-backlight-emulator/dell-uart-backlight-emulator.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Dell AIO Serial Backlight board emulator for testing
+ * the Linux dell-uart-backlight driver.
+ *
+ * Copyright (C) 2024 Hans de Goede <hansg@kernel.org>
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <termios.h>
+#include <unistd.h>
+
+int serial_fd;
+int brightness = 50;
+
+static unsigned char dell_uart_checksum(unsigned char *buf, int len)
+{
+	unsigned char val = 0;
+
+	while (len-- > 0)
+		val += buf[len];
+
+	return val ^ 0xff;
+}
+
+/* read() will return -1 on SIGINT / SIGTERM causing the mainloop to cleanly exit */
+void signalhdlr(int signum)
+{
+}
+
+int main(int argc, char *argv[])
+{
+	struct sigaction sigact = { .sa_handler = signalhdlr };
+	unsigned char buf[4], csum, response[32];
+	const char *version_str = "PHI23-V321";
+	struct termios tty, saved_tty;
+	int ret, idx, len = 0;
+
+	if (argc != 2) {
+		fprintf(stderr, "Invalid or missing arguments\n");
+		fprintf(stderr, "Usage: %s <serial-port>\n", argv[0]);
+		return 1;
+	}
+
+	serial_fd = open(argv[1], O_RDWR | O_NOCTTY);
+	if (serial_fd == -1) {
+		fprintf(stderr, "Error opening %s: %s\n", argv[1], strerror(errno));
+		return 1;
+	}
+
+	ret = tcgetattr(serial_fd, &tty);
+	if (ret == -1) {
+		fprintf(stderr, "Error getting tcattr: %s\n", strerror(errno));
+		goto out_close;
+	}
+	saved_tty = tty;
+
+	cfsetspeed(&tty, 9600);
+	cfmakeraw(&tty);
+	tty.c_cflag &= ~CSTOPB;
+	tty.c_cflag &= ~CRTSCTS;
+	tty.c_cflag |= CLOCAL | CREAD;
+
+	ret = tcsetattr(serial_fd, TCSANOW, &tty);
+	if (ret == -1) {
+		fprintf(stderr, "Error setting tcattr: %s\n", strerror(errno));
+		goto out_restore;
+	}
+
+	sigaction(SIGINT, &sigact, 0);
+	sigaction(SIGTERM, &sigact, 0);
+
+	idx = 0;
+	while (read(serial_fd, &buf[idx], 1) == 1) {
+		if (idx == 0) {
+			switch (buf[0]) {
+			/* 3 MSB bits: cmd-len + 01010 SOF marker */
+			case 0x6a: len = 3; break;
+			case 0x8a: len = 4; break;
+			default:
+				fprintf(stderr, "Error unexpected first byte: 0x%02x\n", buf[0]);
+				continue; /* Try to sync up with sender */
+			}
+		}
+
+		/* Process msg when len bytes have been received */
+		if (idx != (len - 1)) {
+			idx++;
+			continue;
+		}
+
+		/* Reset idx for next command */
+		idx = 0;
+
+		csum = dell_uart_checksum(buf, len - 1);
+		if (buf[len - 1] != csum) {
+			fprintf(stderr, "Error checksum mismatch got 0x%02x expected 0x%02x\n",
+				buf[len - 1], csum);
+			continue;
+		}
+
+		switch ((buf[0] << 8) | buf[1]) {
+		case 0x6a06: /* cmd = 0x06, get version */
+			len = strlen(version_str);
+			strcpy((char *)&response[2], version_str);
+			printf("Get version, reply: %s\n", version_str);
+			break;
+		case 0x8a0b: /* cmd = 0x0b, set brightness */
+			if (buf[2] > 100) {
+				fprintf(stderr, "Error invalid brightness param: %d\n", buf[2]);
+				continue;
+			}
+
+			len = 0;
+			brightness = buf[2];
+			printf("Set brightness %d\n", brightness);
+			break;
+		case 0x6a0c: /* cmd = 0x0c, get brightness */
+			len = 1;
+			response[2] = brightness;
+			printf("Get brightness, reply: %d\n", brightness);
+			break;
+		case 0x8a0e: /* cmd = 0x0e, set backlight power */
+			if (buf[2] != 0 && buf[2] != 1) {
+				fprintf(stderr, "Error invalid set power param: %d\n", buf[2]);
+				continue;
+			}
+
+			len = 0;
+			printf("Set power %d\n", buf[2]);
+			break;
+		default:
+			fprintf(stderr, "Error unknown cmd 0x%04x\n",
+				(buf[0] << 8) | buf[1]);
+			continue;
+		}
+
+		/* Respond with <total-len> <cmd> <data...> <csum> */
+		response[0] = len + 3; /* response length in bytes */
+		response[1] = buf[1];  /* ack cmd */
+		csum = dell_uart_checksum(response, len + 2);
+		response[len + 2] = csum;
+		ret = write(serial_fd, response, response[0]);
+		if (ret != (response[0]))
+			fprintf(stderr, "Error writing %d bytes: %d\n",
+				response[0], ret);
+	}
+
+	ret = 0;
+out_restore:
+	tcsetattr(serial_fd, TCSANOW, &saved_tty);
+out_close:
+	close(serial_fd);
+	return ret;
+}