From a66f962f67ebbbdf7c82c6652180930c0169cf13 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 10 Apr 2024 19:58:52 -0700 Subject: tools/arch/x86/intel_sdsi: Fix maximum meter bundle length MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The maximum number of bundles in the meter certificate was set to 8 which is much less than the maximum. Instead, since the bundles appear at the end of the file, set it based on the remaining file size from the bundle start position. Fixes: 7fdc03a7370f ("tools/arch/x86: intel_sdsi: Add support for reading meter certificates") Signed-off-by: David E. Box Reviewed-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20240411025856.2782476-6-david.e.box@linux.intel.com Signed-off-by: Hans de Goede --- tools/arch/x86/intel_sdsi/intel_sdsi.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'tools/arch') diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c index 2cd92761f171..7eaffcbff788 100644 --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c @@ -43,7 +43,6 @@ #define METER_CERT_MAX_SIZE 4096 #define STATE_MAX_NUM_LICENSES 16 #define STATE_MAX_NUM_IN_BUNDLE (uint32_t)8 -#define METER_MAX_NUM_BUNDLES 8 #define __round_mask(x, y) ((__typeof__(x))((y) - 1)) #define round_up(x, y) ((((x) - 1) | __round_mask(x, y)) + 1) @@ -167,6 +166,11 @@ struct bundle_encoding_counter { uint32_t encoding; uint32_t counter; }; +#define METER_BUNDLE_SIZE sizeof(struct bundle_encoding_counter) +#define BUNDLE_COUNT(length) ((length) / METER_BUNDLE_SIZE) +#define METER_MAX_NUM_BUNDLES \ + ((METER_CERT_MAX_SIZE - sizeof(struct meter_certificate)) / \ + sizeof(struct bundle_encoding_counter)) struct sdsi_dev { struct sdsi_regs regs; @@ -386,9 +390,9 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) return -1; } - if (mc->bundle_length > METER_MAX_NUM_BUNDLES * 8) { - fprintf(stderr, "More than %d bundles: %d\n", - METER_MAX_NUM_BUNDLES, mc->bundle_length / 8); + if (mc->bundle_length > METER_MAX_NUM_BUNDLES * METER_BUNDLE_SIZE) { + fprintf(stderr, "More than %ld bundles: actual %ld\n", + METER_MAX_NUM_BUNDLES, BUNDLE_COUNT(mc->bundle_length)); return -1; } -- cgit v1.2.3 From 76f2bc17428c890754d11aa6aea14b332ba130c5 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 10 Apr 2024 19:58:53 -0700 Subject: tools/arch/x86/intel_sdsi: Fix meter_show display MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fixes sdsi_meter_cert_show() to correctly decode and display the meter certificate output. Adds and displays a missing version field, displays the ASCII name of the signature, and fixes the print alignment. Fixes: 7fdc03a7370f ("tools/arch/x86: intel_sdsi: Add support for reading meter certificates") Signed-off-by: David E. Box Reviewed-by: Kuppuswamy Sathyanarayanan Reviewed-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20240411025856.2782476-7-david.e.box@linux.intel.com Signed-off-by: Hans de Goede --- tools/arch/x86/intel_sdsi/intel_sdsi.c | 29 +++++++++++++++++++---------- 1 file changed, 19 insertions(+), 10 deletions(-) (limited to 'tools/arch') diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c index 7eaffcbff788..ae29214da102 100644 --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c @@ -153,11 +153,12 @@ struct bundle_encoding { }; struct meter_certificate { - uint32_t block_signature; - uint32_t counter_unit; + uint32_t signature; + uint32_t version; uint64_t ppin; + uint32_t counter_unit; uint32_t bundle_length; - uint32_t reserved; + uint64_t reserved; uint32_t mmrc_encoding; uint32_t mmrc_counter; }; @@ -338,6 +339,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) uint32_t count = 0; FILE *cert_ptr; int ret, size; + char name[4]; ret = sdsi_update_registers(s); if (ret) @@ -379,12 +381,19 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) printf("\n"); printf("Meter certificate for device %s\n", s->dev_name); printf("\n"); - printf("Block Signature: 0x%x\n", mc->block_signature); - printf("Count Unit: %dms\n", mc->counter_unit); - printf("PPIN: 0x%lx\n", mc->ppin); - printf("Feature Bundle Length: %d\n", mc->bundle_length); - printf("MMRC encoding: %d\n", mc->mmrc_encoding); - printf("MMRC counter: %d\n", mc->mmrc_counter); + + get_feature(mc->signature, name); + printf("Signature: %.4s\n", name); + + printf("Version: %d\n", mc->version); + printf("Count Unit: %dms\n", mc->counter_unit); + printf("PPIN: 0x%lx\n", mc->ppin); + printf("Feature Bundle Length: %d\n", mc->bundle_length); + + get_feature(mc->mmrc_encoding, name); + printf("MMRC encoding: %.4s\n", name); + + printf("MMRC counter: %d\n", mc->mmrc_counter); if (mc->bundle_length % 8) { fprintf(stderr, "Invalid bundle length\n"); return -1; @@ -398,7 +407,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) bec = (void *)(mc) + sizeof(mc); - printf("Number of Feature Counters: %d\n", mc->bundle_length / 8); + printf("Number of Feature Counters: %ld\n", BUNDLE_COUNT(mc->bundle_length)); while (count++ < mc->bundle_length / 8) { char feature[5]; -- cgit v1.2.3 From 09d70ded6c566fd00886be32c26d0b2004ef239c Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 10 Apr 2024 19:58:54 -0700 Subject: tools/arch/x86/intel_sdsi: Fix meter_certificate decoding MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix errors in the calculation of the start position of the counters and in the display loop. While here, use a #define for the bundle count and size. Fixes: 7fdc03a7370f ("tools/arch/x86: intel_sdsi: Add support for reading meter certificates") Signed-off-by: David E. Box Reviewed-by: Kuppuswamy Sathyanarayanan Reviewed-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20240411025856.2782476-8-david.e.box@linux.intel.com Signed-off-by: Hans de Goede --- tools/arch/x86/intel_sdsi/intel_sdsi.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'tools/arch') diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c index ae29214da102..ba2a6b6645ae 100644 --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c @@ -394,7 +394,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) printf("MMRC encoding: %.4s\n", name); printf("MMRC counter: %d\n", mc->mmrc_counter); - if (mc->bundle_length % 8) { + if (mc->bundle_length % METER_BUNDLE_SIZE) { fprintf(stderr, "Invalid bundle length\n"); return -1; } @@ -405,15 +405,16 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) return -1; } - bec = (void *)(mc) + sizeof(mc); + bec = (struct bundle_encoding_counter *)(mc + 1); printf("Number of Feature Counters: %ld\n", BUNDLE_COUNT(mc->bundle_length)); - while (count++ < mc->bundle_length / 8) { + while (count < BUNDLE_COUNT(mc->bundle_length)) { char feature[5]; feature[4] = '\0'; get_feature(bec[count].encoding, feature); printf(" %s: %d\n", feature, bec[count].counter); + ++count; } return 0; -- cgit v1.2.3 From 53310fe98c7b7a48b31e8e6e556a25a1238a7691 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 10 Apr 2024 19:58:55 -0700 Subject: tools/arch/x86/intel_sdsi: Simplify ascii printing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add #define for feature length and move NUL assignment from callers to get_feature(). Signed-off-by: David E. Box Reviewed-by: Kuppuswamy Sathyanarayanan Reviewed-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20240411025856.2782476-9-david.e.box@linux.intel.com Signed-off-by: Hans de Goede --- tools/arch/x86/intel_sdsi/intel_sdsi.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) (limited to 'tools/arch') diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c index ba2a6b6645ae..301213370740 100644 --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c @@ -43,6 +43,7 @@ #define METER_CERT_MAX_SIZE 4096 #define STATE_MAX_NUM_LICENSES 16 #define STATE_MAX_NUM_IN_BUNDLE (uint32_t)8 +#define FEAT_LEN 5 /* 4 plus NUL terminator */ #define __round_mask(x, y) ((__typeof__(x))((y) - 1)) #define round_up(x, y) ((((x) - 1) | __round_mask(x, y)) + 1) @@ -321,10 +322,11 @@ static char *content_type(uint32_t type) } } -static void get_feature(uint32_t encoding, char *feature) +static void get_feature(uint32_t encoding, char feature[5]) { char *name = (char *)&encoding; + feature[4] = '\0'; feature[3] = name[0]; feature[2] = name[1]; feature[1] = name[2]; @@ -339,7 +341,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) uint32_t count = 0; FILE *cert_ptr; int ret, size; - char name[4]; + char name[FEAT_LEN]; ret = sdsi_update_registers(s); if (ret) @@ -383,7 +385,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) printf("\n"); get_feature(mc->signature, name); - printf("Signature: %.4s\n", name); + printf("Signature: %s\n", name); printf("Version: %d\n", mc->version); printf("Count Unit: %dms\n", mc->counter_unit); @@ -391,7 +393,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) printf("Feature Bundle Length: %d\n", mc->bundle_length); get_feature(mc->mmrc_encoding, name); - printf("MMRC encoding: %.4s\n", name); + printf("MMRC encoding: %s\n", name); printf("MMRC counter: %d\n", mc->mmrc_counter); if (mc->bundle_length % METER_BUNDLE_SIZE) { @@ -409,9 +411,8 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) printf("Number of Feature Counters: %ld\n", BUNDLE_COUNT(mc->bundle_length)); while (count < BUNDLE_COUNT(mc->bundle_length)) { - char feature[5]; + char feature[FEAT_LEN]; - feature[4] = '\0'; get_feature(bec[count].encoding, feature); printf(" %s: %d\n", feature, bec[count].counter); ++count; @@ -494,7 +495,7 @@ static int sdsi_state_cert_show(struct sdsi_dev *s) sizeof(*lki) + // size of the license key info offset; // offset to this blob content struct bundle_encoding *bundle = (void *)(lbc) + sizeof(*lbc); - char feature[5]; + char feature[FEAT_LEN]; uint32_t i; printf(" Blob %d:\n", count - 1); @@ -507,8 +508,6 @@ static int sdsi_state_cert_show(struct sdsi_dev *s) printf(" Blob revision ID: %u\n", lbc->rev_id); printf(" Number of Features: %u\n", lbc->num_bundles); - feature[4] = '\0'; - for (i = 0; i < min(lbc->num_bundles, STATE_MAX_NUM_IN_BUNDLE); i++) { get_feature(bundle[i].encoding, feature); printf(" Feature %d: %s\n", i, feature); -- cgit v1.2.3 From f24644581ba92c901bbc2b69a1a6f6d178ee59d4 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 10 Apr 2024 19:58:56 -0700 Subject: tools/arch/x86/intel_sdsi: Add current meter support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add support to read the 'meter_current' file. The display is the same as the 'meter_certificate', but will show the current snapshot of the counters. Signed-off-by: David E. Box Reviewed-by: Kuppuswamy Sathyanarayanan Reviewed-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20240411025856.2782476-10-david.e.box@linux.intel.com Signed-off-by: Hans de Goede --- tools/arch/x86/intel_sdsi/intel_sdsi.c | 49 +++++++++++++++++++++------------- 1 file changed, 30 insertions(+), 19 deletions(-) (limited to 'tools/arch') diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c index 301213370740..766a5d26f534 100644 --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c @@ -185,6 +185,7 @@ struct sdsi_dev { enum command { CMD_SOCKET_INFO, CMD_METER_CERT, + CMD_METER_CURRENT_CERT, CMD_STATE_CERT, CMD_PROV_AKC, CMD_PROV_CAP, @@ -333,13 +334,14 @@ static void get_feature(uint32_t encoding, char feature[5]) feature[0] = name[3]; } -static int sdsi_meter_cert_show(struct sdsi_dev *s) +static int sdsi_meter_cert_show(struct sdsi_dev *s, bool show_current) { char buf[METER_CERT_MAX_SIZE] = {0}; struct bundle_encoding_counter *bec; struct meter_certificate *mc; uint32_t count = 0; FILE *cert_ptr; + char *cert_fname; int ret, size; char name[FEAT_LEN]; @@ -349,7 +351,6 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) if (!s->regs.en_features.sdsi) { fprintf(stderr, "SDSi feature is present but not enabled.\n"); - fprintf(stderr, " Unable to read meter certificate\n"); return -1; } @@ -364,15 +365,17 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s) return ret; } - cert_ptr = fopen("meter_certificate", "r"); + cert_fname = show_current ? "meter_current" : "meter_certificate"; + cert_ptr = fopen(cert_fname, "r"); + if (!cert_ptr) { - perror("Could not open 'meter_certificate' file"); + fprintf(stderr, "Could not open '%s' file: %s", cert_fname, strerror(errno)); return -1; } size = fread(buf, 1, sizeof(buf), cert_ptr); if (!size) { - fprintf(stderr, "Could not read 'meter_certificate' file\n"); + fprintf(stderr, "Could not read '%s' file\n", cert_fname); fclose(cert_ptr); return -1; } @@ -738,7 +741,7 @@ static void sdsi_free_dev(struct sdsi_dev *s) static void usage(char *prog) { - printf("Usage: %s [-l] [-d DEVNO [-i] [-s] [-m] [-a FILE] [-c FILE]]\n", prog); + printf("Usage: %s [-l] [-d DEVNO [-i] [-s] [-m | -C] [-a FILE] [-c FILE]\n", prog); } static void show_help(void) @@ -747,8 +750,9 @@ static void show_help(void) printf(" %-18s\t%s\n", "-l, --list", "list available On Demand devices"); printf(" %-18s\t%s\n", "-d, --devno DEVNO", "On Demand device number"); printf(" %-18s\t%s\n", "-i, --info", "show socket information"); - printf(" %-18s\t%s\n", "-s, --state", "show state certificate"); - printf(" %-18s\t%s\n", "-m, --meter", "show meter certificate"); + printf(" %-18s\t%s\n", "-s, --state", "show state certificate data"); + printf(" %-18s\t%s\n", "-m, --meter", "show meter certificate data"); + printf(" %-18s\t%s\n", "-C, --meter_current", "show live unattested meter data"); printf(" %-18s\t%s\n", "-a, --akc FILE", "provision socket with AKC FILE"); printf(" %-18s\t%s\n", "-c, --cap FILE>", "provision socket with CAP FILE"); } @@ -764,21 +768,22 @@ int main(int argc, char *argv[]) int option_index = 0; static struct option long_options[] = { - {"akc", required_argument, 0, 'a'}, - {"cap", required_argument, 0, 'c'}, - {"devno", required_argument, 0, 'd'}, - {"help", no_argument, 0, 'h'}, - {"info", no_argument, 0, 'i'}, - {"list", no_argument, 0, 'l'}, - {"meter", no_argument, 0, 'm'}, - {"state", no_argument, 0, 's'}, - {0, 0, 0, 0 } + {"akc", required_argument, 0, 'a'}, + {"cap", required_argument, 0, 'c'}, + {"devno", required_argument, 0, 'd'}, + {"help", no_argument, 0, 'h'}, + {"info", no_argument, 0, 'i'}, + {"list", no_argument, 0, 'l'}, + {"meter", no_argument, 0, 'm'}, + {"meter_current", no_argument, 0, 'C'}, + {"state", no_argument, 0, 's'}, + {0, 0, 0, 0 } }; progname = argv[0]; - while ((opt = getopt_long_only(argc, argv, "+a:c:d:hilms", long_options, + while ((opt = getopt_long_only(argc, argv, "+a:c:d:hilmCs", long_options, &option_index)) != -1) { switch (opt) { case 'd': @@ -794,6 +799,9 @@ int main(int argc, char *argv[]) case 'm': command = CMD_METER_CERT; break; + case 'C': + command = CMD_METER_CURRENT_CERT; + break; case 's': command = CMD_STATE_CERT; break; @@ -832,7 +840,10 @@ int main(int argc, char *argv[]) ret = sdsi_read_reg(s); break; case CMD_METER_CERT: - ret = sdsi_meter_cert_show(s); + ret = sdsi_meter_cert_show(s, false); + break; + case CMD_METER_CURRENT_CERT: + ret = sdsi_meter_cert_show(s, true); break; case CMD_STATE_CERT: ret = sdsi_state_cert_show(s); -- cgit v1.2.3 From d9bab776ed9e50fa076d2b42544b0c612be16d7c Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 13 May 2024 16:46:02 +0200 Subject: tools arch x86: Add dell-uart-backlight-emulator Dell All In One (AIO) models released after 2017 use a backlight controller board connected to an UART. Add a small emulator to allow development and testing of the drivers/platform/x86/dell/dell-uart-backlight.c driver for this board, without requiring access to an actual Dell All In One. Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20240513144603.93874-3-hdegoede@redhat.com --- .../x86/dell-uart-backlight-emulator/.gitignore | 1 + .../arch/x86/dell-uart-backlight-emulator/Makefile | 19 +++ tools/arch/x86/dell-uart-backlight-emulator/README | 46 ++++++ .../dell-uart-backlight-emulator.c | 163 +++++++++++++++++++++ 4 files changed, 229 insertions(+) create mode 100644 tools/arch/x86/dell-uart-backlight-emulator/.gitignore create mode 100644 tools/arch/x86/dell-uart-backlight-emulator/Makefile create mode 100644 tools/arch/x86/dell-uart-backlight-emulator/README create mode 100644 tools/arch/x86/dell-uart-backlight-emulator/dell-uart-backlight-emulator.c (limited to 'tools/arch') diff --git a/tools/arch/x86/dell-uart-backlight-emulator/.gitignore b/tools/arch/x86/dell-uart-backlight-emulator/.gitignore new file mode 100644 index 000000000000..5c8cad8d72b9 --- /dev/null +++ b/tools/arch/x86/dell-uart-backlight-emulator/.gitignore @@ -0,0 +1 @@ +dell-uart-backlight-emulator diff --git a/tools/arch/x86/dell-uart-backlight-emulator/Makefile b/tools/arch/x86/dell-uart-backlight-emulator/Makefile new file mode 100644 index 000000000000..6ea1d9fd534b --- /dev/null +++ b/tools/arch/x86/dell-uart-backlight-emulator/Makefile @@ -0,0 +1,19 @@ +# SPDX-License-Identifier: GPL-2.0 +# Makefile for Intel Software Defined Silicon provisioning tool + +dell-uart-backlight-emulator: dell-uart-backlight-emulator.c + +BINDIR ?= /usr/bin + +override CFLAGS += -O2 -Wall + +%: %.c + $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS) + +.PHONY : clean +clean : + @rm -f dell-uart-backlight-emulator + +install : dell-uart-backlight-emulator + install -d $(DESTDIR)$(BINDIR) + install -m 755 -p dell-uart-backlight-emulator $(DESTDIR)$(BINDIR)/dell-uart-backlight-emulator diff --git a/tools/arch/x86/dell-uart-backlight-emulator/README b/tools/arch/x86/dell-uart-backlight-emulator/README new file mode 100644 index 000000000000..c0d8e52046ee --- /dev/null +++ b/tools/arch/x86/dell-uart-backlight-emulator/README @@ -0,0 +1,46 @@ +Emulator for DELL0501 UART attached backlight controller +-------------------------------------------------------- + +Dell All In One (AIO) models released after 2017 use a backlight controller +board connected to an UART. + +In DSDT this uart port will be defined as: + + Name (_HID, "DELL0501") + Name (_CID, EisaId ("PNP0501") + +With the DELL0501 indicating that we are dealing with an UART with +the backlight controller board attached. + +This small emulator allows testing +the drivers/platform/x86/dell/dell-uart-backlight.c driver without access +to an actual Dell All In One. + +This requires: +1. A (desktop) PC with a 16550 UART on the motherboard and a standard DB9 + connector connected to this UART. +2. A DB9 NULL modem cable. +3. A second DB9 serial port, this can e.g. be a USB to serial converter + with a DB9 connector plugged into the same desktop PC. +4. A DSDT overlay for the desktop PC replacing the _HID of the 16550 UART + ACPI Device() with "DELL0501" and adding a _CID of "PNP0501", see + DSDT.patch for an example of the necessary DSDT changes. + +With everything setup and the NULL modem cable connected between +the 2 serial ports run: + +./dell-uart-backlight-emulator + +For example when using an USB to serial converter for the second port: + +./dell-uart-backlight-emulator /dev/ttyUSB0 + +And then (re)load the dell-uart-backlight driver: + +sudo rmmod dell-uart-backlight; sudo modprobe dell-uart-backlight dyndbg + +After this check "dmesg" to see if the driver correctly received +the firmware version string from the emulator. If this works there +should be a /sys/class/backlight/dell_uart_backlight/ directory now +and writes to the brightness or bl_power files should be reflected +by matching output from the emulator. 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 + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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 \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 */ + 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; +} -- cgit v1.2.3