mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 08:34:20 +08:00
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
parent
d1db0eea85
commit
d7cddbb07b
@ -19,6 +19,8 @@ OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
|
||||
$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
|
||||
endif
|
||||
|
||||
SUBDIRS = tools/ec
|
||||
|
||||
# --- CONFIGURATION BEGIN ---
|
||||
|
||||
# Set the following to `true' to make a unstripped, unoptimized
|
||||
|
||||
22
tools/power/acpi/tools/ec/Makefile
Normal file
22
tools/power/acpi/tools/ec/Makefile
Normal file
@ -0,0 +1,22 @@
|
||||
ec_access: ec_access.o
|
||||
$(ECHO) " LD " $@
|
||||
$(QUIET) $(LD) $(CFLAGS) $(LDFLAGS) $< -o $@
|
||||
$(QUIET) $(STRIPCMD) $@
|
||||
|
||||
%.o: %.c
|
||||
$(ECHO) " CC " $@
|
||||
$(QUIET) $(CC) -c $(CFLAGS) -o $@ $<
|
||||
|
||||
all: ec_access
|
||||
|
||||
install:
|
||||
$(INSTALL) -d $(DESTDIR)${sbindir}
|
||||
$(INSTALL_PROGRAM) ec_access $(DESTDIR)${sbindir}
|
||||
|
||||
uninstall:
|
||||
- rm -f $(DESTDIR)${sbindir}/ec_access
|
||||
|
||||
clean:
|
||||
-rm -f $(OUTPUT)ec_access
|
||||
|
||||
.PHONY: all install uninstall
|
||||
238
tools/power/acpi/tools/ec/ec_access.c
Normal file
238
tools/power/acpi/tools/ec/ec_access.c
Normal file
@ -0,0 +1,238 @@
|
||||
/*
|
||||
* ec_access.c
|
||||
*
|
||||
* Copyright (C) 2010 SUSE Linux Products GmbH
|
||||
* Author:
|
||||
* Thomas Renninger <trenn@suse.de>
|
||||
*
|
||||
* This work is licensed under the terms of the GNU GPL, version 2.
|
||||
*/
|
||||
|
||||
#include <fcntl.h>
|
||||
#include <err.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <libgen.h>
|
||||
#include <unistd.h>
|
||||
#include <getopt.h>
|
||||
#include <stdint.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
|
||||
|
||||
#define EC_SPACE_SIZE 256
|
||||
#define SYSFS_PATH "/sys/kernel/debug/ec/ec0/io"
|
||||
|
||||
/* TBD/Enhancements:
|
||||
- Provide param for accessing different ECs (not supported by kernel yet)
|
||||
*/
|
||||
|
||||
static int read_mode = -1;
|
||||
static int sleep_time;
|
||||
static int write_byte_offset = -1;
|
||||
static int read_byte_offset = -1;
|
||||
static uint8_t write_value = -1;
|
||||
|
||||
void usage(char progname[], int exit_status)
|
||||
{
|
||||
printf("Usage:\n");
|
||||
printf("1) %s -r [-s sleep]\n", basename(progname));
|
||||
printf("2) %s -b byte_offset\n", basename(progname));
|
||||
printf("3) %s -w byte_offset -v value\n\n", basename(progname));
|
||||
|
||||
puts("\t-r [-s sleep] : Dump EC registers");
|
||||
puts("\t If sleep is given, sleep x seconds,");
|
||||
puts("\t re-read EC registers and show changes");
|
||||
puts("\t-b offset : Read value at byte_offset (in hex)");
|
||||
puts("\t-w offset -v value : Write value at byte_offset");
|
||||
puts("\t-h : Print this help\n\n");
|
||||
puts("Offsets and values are in hexadecimal number sytem.");
|
||||
puts("The offset and value must be between 0 and 0xff.");
|
||||
exit(exit_status);
|
||||
}
|
||||
|
||||
void parse_opts(int argc, char *argv[])
|
||||
{
|
||||
int c;
|
||||
|
||||
while ((c = getopt(argc, argv, "rs:b:w:v:h")) != -1) {
|
||||
|
||||
switch (c) {
|
||||
case 'r':
|
||||
if (read_mode != -1)
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
read_mode = 1;
|
||||
break;
|
||||
case 's':
|
||||
if (read_mode != -1 && read_mode != 1)
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
|
||||
sleep_time = atoi(optarg);
|
||||
if (sleep_time <= 0) {
|
||||
sleep_time = 0;
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
printf("Bad sleep time: %s\n", optarg);
|
||||
}
|
||||
break;
|
||||
case 'b':
|
||||
if (read_mode != -1)
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
read_mode = 1;
|
||||
read_byte_offset = strtoul(optarg, NULL, 16);
|
||||
break;
|
||||
case 'w':
|
||||
if (read_mode != -1)
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
read_mode = 0;
|
||||
write_byte_offset = strtoul(optarg, NULL, 16);
|
||||
break;
|
||||
case 'v':
|
||||
write_value = strtoul(optarg, NULL, 16);
|
||||
break;
|
||||
case 'h':
|
||||
usage(argv[0], EXIT_SUCCESS);
|
||||
default:
|
||||
fprintf(stderr, "Unknown option!\n");
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
if (read_mode == 0) {
|
||||
if (write_byte_offset < 0 ||
|
||||
write_byte_offset >= EC_SPACE_SIZE) {
|
||||
fprintf(stderr, "Wrong byte offset 0x%.2x, valid: "
|
||||
"[0-0x%.2x]\n",
|
||||
write_byte_offset, EC_SPACE_SIZE - 1);
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
}
|
||||
if (write_value < 0 ||
|
||||
write_value >= 255) {
|
||||
fprintf(stderr, "Wrong byte offset 0x%.2x, valid:"
|
||||
"[0-0xff]\n", write_byte_offset);
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
if (read_mode == 1 && read_byte_offset != -1) {
|
||||
if (read_byte_offset < -1 ||
|
||||
read_byte_offset >= EC_SPACE_SIZE) {
|
||||
fprintf(stderr, "Wrong byte offset 0x%.2x, valid: "
|
||||
"[0-0x%.2x]\n",
|
||||
read_byte_offset, EC_SPACE_SIZE - 1);
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
/* Add additional parameter checks here */
|
||||
}
|
||||
|
||||
void dump_ec(int fd)
|
||||
{
|
||||
char buf[EC_SPACE_SIZE];
|
||||
char buf2[EC_SPACE_SIZE];
|
||||
int byte_off, bytes_read;
|
||||
|
||||
bytes_read = read(fd, buf, EC_SPACE_SIZE);
|
||||
|
||||
if (bytes_read == -1)
|
||||
err(EXIT_FAILURE, "Could not read from %s\n", SYSFS_PATH);
|
||||
|
||||
if (bytes_read != EC_SPACE_SIZE)
|
||||
fprintf(stderr, "Could only read %d bytes\n", bytes_read);
|
||||
|
||||
printf(" 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");
|
||||
for (byte_off = 0; byte_off < bytes_read; byte_off++) {
|
||||
if ((byte_off % 16) == 0)
|
||||
printf("\n%.2X: ", byte_off);
|
||||
printf(" %.2x ", (uint8_t)buf[byte_off]);
|
||||
}
|
||||
printf("\n");
|
||||
|
||||
if (!sleep_time)
|
||||
return;
|
||||
|
||||
printf("\n");
|
||||
lseek(fd, 0, SEEK_SET);
|
||||
sleep(sleep_time);
|
||||
|
||||
bytes_read = read(fd, buf2, EC_SPACE_SIZE);
|
||||
|
||||
if (bytes_read == -1)
|
||||
err(EXIT_FAILURE, "Could not read from %s\n", SYSFS_PATH);
|
||||
|
||||
if (bytes_read != EC_SPACE_SIZE)
|
||||
fprintf(stderr, "Could only read %d bytes\n", bytes_read);
|
||||
|
||||
printf(" 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");
|
||||
for (byte_off = 0; byte_off < bytes_read; byte_off++) {
|
||||
if ((byte_off % 16) == 0)
|
||||
printf("\n%.2X: ", byte_off);
|
||||
|
||||
if (buf[byte_off] == buf2[byte_off])
|
||||
printf(" %.2x ", (uint8_t)buf2[byte_off]);
|
||||
else
|
||||
printf("*%.2x ", (uint8_t)buf2[byte_off]);
|
||||
}
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
void read_ec_val(int fd, int byte_offset)
|
||||
{
|
||||
uint8_t buf;
|
||||
int error;
|
||||
|
||||
error = lseek(fd, byte_offset, SEEK_SET);
|
||||
if (error != byte_offset)
|
||||
err(EXIT_FAILURE, "Cannot set offset to 0x%.2x", byte_offset);
|
||||
|
||||
error = read(fd, &buf, 1);
|
||||
if (error != 1)
|
||||
err(EXIT_FAILURE, "Could not read byte 0x%.2x from %s\n",
|
||||
byte_offset, SYSFS_PATH);
|
||||
printf("0x%.2x\n", buf);
|
||||
return;
|
||||
}
|
||||
|
||||
void write_ec_val(int fd, int byte_offset, uint8_t value)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = lseek(fd, byte_offset, SEEK_SET);
|
||||
if (error != byte_offset)
|
||||
err(EXIT_FAILURE, "Cannot set offset to 0x%.2x", byte_offset);
|
||||
|
||||
error = write(fd, &value, 1);
|
||||
if (error != 1)
|
||||
err(EXIT_FAILURE, "Cannot write value 0x%.2x to offset 0x%.2x",
|
||||
value, byte_offset);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
int file_mode = O_RDONLY;
|
||||
int fd;
|
||||
|
||||
parse_opts(argc, argv);
|
||||
|
||||
if (read_mode == 0)
|
||||
file_mode = O_WRONLY;
|
||||
else if (read_mode == 1)
|
||||
file_mode = O_RDONLY;
|
||||
else
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
|
||||
fd = open(SYSFS_PATH, file_mode);
|
||||
if (fd == -1)
|
||||
err(EXIT_FAILURE, "%s", SYSFS_PATH);
|
||||
|
||||
if (read_mode)
|
||||
if (read_byte_offset == -1)
|
||||
dump_ec(fd);
|
||||
else if (read_byte_offset < 0 ||
|
||||
read_byte_offset >= EC_SPACE_SIZE)
|
||||
usage(argv[0], EXIT_FAILURE);
|
||||
else
|
||||
read_ec_val(fd, read_byte_offset);
|
||||
else
|
||||
write_ec_val(fd, write_byte_offset, write_value);
|
||||
close(fd);
|
||||
|
||||
exit(EXIT_SUCCESS);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user