ACPI / tools: Introduce ec_access.c - tool to access the EC
This userspace tool accesses the EC through the ec_sys debug driver (through /sys/kernel/debug/ec/ec0/io). The EC command/data registers cannot be accessed directly, because they may be manipulated by the AML interpreter in parallel. The ec_sys driver synchronizes user space (debug) access with the AML interpreter. Signed-off-by: Thomas Renninger <trenn@suse.de> [rjw: Changelog] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Thomas Renninger
Rafael J. Wysocki
Родитель
d1db0eea85
Коммит
d7cddbb07b
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@ -19,6 +19,8 @@ OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
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$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
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endif
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SUBDIRS = tools/ec
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# --- CONFIGURATION BEGIN ---
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# Set the following to `true' to make a unstripped, unoptimized
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@ -0,0 +1,22 @@
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ec_access: ec_access.o
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$(ECHO) " LD " $@
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$(QUIET) $(LD) $(CFLAGS) $(LDFLAGS) $< -o $@
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$(QUIET) $(STRIPCMD) $@
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%.o: %.c
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$(ECHO) " CC " $@
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$(QUIET) $(CC) -c $(CFLAGS) -o $@ $<
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all: ec_access
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install:
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$(INSTALL) -d $(DESTDIR)${sbindir}
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$(INSTALL_PROGRAM) ec_access $(DESTDIR)${sbindir}
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uninstall:
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- rm -f $(DESTDIR)${sbindir}/ec_access
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clean:
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-rm -f $(OUTPUT)ec_access
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.PHONY: all install uninstall
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@ -0,0 +1,238 @@
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/*
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* ec_access.c
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*
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* Copyright (C) 2010 SUSE Linux Products GmbH
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* Author:
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* Thomas Renninger <trenn@suse.de>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*/
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#include <fcntl.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <libgen.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define EC_SPACE_SIZE 256
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#define SYSFS_PATH "/sys/kernel/debug/ec/ec0/io"
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/* TBD/Enhancements:
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- Provide param for accessing different ECs (not supported by kernel yet)
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*/
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static int read_mode = -1;
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static int sleep_time;
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static int write_byte_offset = -1;
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static int read_byte_offset = -1;
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static uint8_t write_value = -1;
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void usage(char progname[], int exit_status)
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{
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printf("Usage:\n");
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printf("1) %s -r [-s sleep]\n", basename(progname));
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printf("2) %s -b byte_offset\n", basename(progname));
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printf("3) %s -w byte_offset -v value\n\n", basename(progname));
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puts("\t-r [-s sleep] : Dump EC registers");
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puts("\t If sleep is given, sleep x seconds,");
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puts("\t re-read EC registers and show changes");
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puts("\t-b offset : Read value at byte_offset (in hex)");
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puts("\t-w offset -v value : Write value at byte_offset");
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puts("\t-h : Print this help\n\n");
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puts("Offsets and values are in hexadecimal number sytem.");
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puts("The offset and value must be between 0 and 0xff.");
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exit(exit_status);
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}
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void parse_opts(int argc, char *argv[])
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{
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int c;
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while ((c = getopt(argc, argv, "rs:b:w:v:h")) != -1) {
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switch (c) {
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case 'r':
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if (read_mode != -1)
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usage(argv[0], EXIT_FAILURE);
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read_mode = 1;
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break;
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case 's':
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if (read_mode != -1 && read_mode != 1)
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usage(argv[0], EXIT_FAILURE);
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sleep_time = atoi(optarg);
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if (sleep_time <= 0) {
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sleep_time = 0;
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usage(argv[0], EXIT_FAILURE);
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printf("Bad sleep time: %s\n", optarg);
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}
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break;
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case 'b':
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if (read_mode != -1)
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usage(argv[0], EXIT_FAILURE);
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read_mode = 1;
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read_byte_offset = strtoul(optarg, NULL, 16);
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break;
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case 'w':
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if (read_mode != -1)
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usage(argv[0], EXIT_FAILURE);
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read_mode = 0;
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write_byte_offset = strtoul(optarg, NULL, 16);
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break;
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case 'v':
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write_value = strtoul(optarg, NULL, 16);
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break;
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case 'h':
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usage(argv[0], EXIT_SUCCESS);
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default:
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fprintf(stderr, "Unknown option!\n");
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usage(argv[0], EXIT_FAILURE);
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}
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}
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if (read_mode == 0) {
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if (write_byte_offset < 0 ||
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write_byte_offset >= EC_SPACE_SIZE) {
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fprintf(stderr, "Wrong byte offset 0x%.2x, valid: "
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"[0-0x%.2x]\n",
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write_byte_offset, EC_SPACE_SIZE - 1);
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usage(argv[0], EXIT_FAILURE);
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}
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if (write_value < 0 ||
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write_value >= 255) {
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fprintf(stderr, "Wrong byte offset 0x%.2x, valid:"
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"[0-0xff]\n", write_byte_offset);
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usage(argv[0], EXIT_FAILURE);
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}
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}
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if (read_mode == 1 && read_byte_offset != -1) {
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if (read_byte_offset < -1 ||
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read_byte_offset >= EC_SPACE_SIZE) {
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fprintf(stderr, "Wrong byte offset 0x%.2x, valid: "
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"[0-0x%.2x]\n",
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read_byte_offset, EC_SPACE_SIZE - 1);
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usage(argv[0], EXIT_FAILURE);
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}
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}
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/* Add additional parameter checks here */
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}
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void dump_ec(int fd)
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{
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char buf[EC_SPACE_SIZE];
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char buf2[EC_SPACE_SIZE];
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int byte_off, bytes_read;
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bytes_read = read(fd, buf, EC_SPACE_SIZE);
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if (bytes_read == -1)
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err(EXIT_FAILURE, "Could not read from %s\n", SYSFS_PATH);
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if (bytes_read != EC_SPACE_SIZE)
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fprintf(stderr, "Could only read %d bytes\n", bytes_read);
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printf(" 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");
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for (byte_off = 0; byte_off < bytes_read; byte_off++) {
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if ((byte_off % 16) == 0)
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printf("\n%.2X: ", byte_off);
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printf(" %.2x ", (uint8_t)buf[byte_off]);
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}
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printf("\n");
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if (!sleep_time)
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return;
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printf("\n");
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lseek(fd, 0, SEEK_SET);
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sleep(sleep_time);
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bytes_read = read(fd, buf2, EC_SPACE_SIZE);
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if (bytes_read == -1)
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err(EXIT_FAILURE, "Could not read from %s\n", SYSFS_PATH);
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if (bytes_read != EC_SPACE_SIZE)
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fprintf(stderr, "Could only read %d bytes\n", bytes_read);
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printf(" 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");
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for (byte_off = 0; byte_off < bytes_read; byte_off++) {
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if ((byte_off % 16) == 0)
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printf("\n%.2X: ", byte_off);
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if (buf[byte_off] == buf2[byte_off])
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printf(" %.2x ", (uint8_t)buf2[byte_off]);
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else
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printf("*%.2x ", (uint8_t)buf2[byte_off]);
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}
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printf("\n");
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}
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void read_ec_val(int fd, int byte_offset)
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{
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uint8_t buf;
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int error;
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error = lseek(fd, byte_offset, SEEK_SET);
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if (error != byte_offset)
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err(EXIT_FAILURE, "Cannot set offset to 0x%.2x", byte_offset);
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error = read(fd, &buf, 1);
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if (error != 1)
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err(EXIT_FAILURE, "Could not read byte 0x%.2x from %s\n",
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byte_offset, SYSFS_PATH);
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printf("0x%.2x\n", buf);
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return;
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}
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void write_ec_val(int fd, int byte_offset, uint8_t value)
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{
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int error;
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error = lseek(fd, byte_offset, SEEK_SET);
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if (error != byte_offset)
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err(EXIT_FAILURE, "Cannot set offset to 0x%.2x", byte_offset);
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error = write(fd, &value, 1);
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if (error != 1)
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err(EXIT_FAILURE, "Cannot write value 0x%.2x to offset 0x%.2x",
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value, byte_offset);
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}
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int main(int argc, char *argv[])
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{
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int file_mode = O_RDONLY;
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int fd;
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parse_opts(argc, argv);
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if (read_mode == 0)
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file_mode = O_WRONLY;
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else if (read_mode == 1)
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file_mode = O_RDONLY;
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else
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usage(argv[0], EXIT_FAILURE);
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fd = open(SYSFS_PATH, file_mode);
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if (fd == -1)
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err(EXIT_FAILURE, "%s", SYSFS_PATH);
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if (read_mode)
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if (read_byte_offset == -1)
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dump_ec(fd);
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else if (read_byte_offset < 0 ||
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read_byte_offset >= EC_SPACE_SIZE)
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usage(argv[0], EXIT_FAILURE);
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else
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read_ec_val(fd, read_byte_offset);
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else
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write_ec_val(fd, write_byte_offset, write_value);
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close(fd);
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exit(EXIT_SUCCESS);
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}
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