mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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2730daa567
The maximum packet / param size differs depending on interface and protocol version. Commands can now ask the comm interface what the limits are, and can use preallocated buffers to avoid needless malloc/free. BUG=chrome-os-partner:20571 BRANCH=none TEST=the following all work on link burn_my_ec ectool version ectool chargedump ectool console ectool i2cxfer 5 0x41 2 Change-Id: Ib847994da3f79721e7fb4e347231b9147a3f485f Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/60275
96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "cros_ec_dev.h"
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#include "comm-host.h"
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#include "ec_commands.h"
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static int fd = -1;
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static int ec_command_dev(int command, int version,
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const void *outdata, int outsize,
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void *indata, int insize)
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{
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struct cros_ec_command s_cmd;
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int r;
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s_cmd.command = command;
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s_cmd.version = version;
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s_cmd.result = 0xff;
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s_cmd.outsize = outsize;
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s_cmd.outdata = (uint8_t *)outdata;
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s_cmd.insize = insize;
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s_cmd.indata = indata;
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r = ioctl(fd, CROS_EC_DEV_IOCXCMD, &s_cmd);
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if (r < 0) {
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fprintf(stderr, "ioctl %d, errno %d (%s), EC result %d\n",
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r, errno, strerror(errno), s_cmd.result);
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return r;
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}
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if (s_cmd.result != EC_RES_SUCCESS)
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fprintf(stderr, "EC result %d\n", s_cmd.result);
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return s_cmd.insize;
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}
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static int ec_readmem_dev(int offset, int bytes, void *dest)
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{
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struct cros_ec_readmem s_mem;
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s_mem.offset = offset;
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s_mem.bytes = bytes;
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s_mem.buffer = dest;
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return ioctl(fd, CROS_EC_DEV_IOCRDMEM, &s_mem);
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}
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int comm_init_dev(void)
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{
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char version[80];
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int r;
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char *s;
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fd = open("/dev/" CROS_EC_DEV_NAME, O_RDWR);
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if (fd < 0)
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return 1;
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r = read(fd, version, sizeof(version)-1);
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if (r <= 0) {
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close(fd);
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return 2;
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}
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version[r] = '\0';
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s = strchr(version, '\n');
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if (s)
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*s = '\0';
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if (strcmp(version, CROS_EC_DEV_VERSION)) {
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close(fd);
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return 3;
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}
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ec_command = ec_command_dev;
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if (ec_readmem_dev(EC_MEMMAP_ID, 2, version) == 2)
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ec_readmem = ec_readmem_dev;
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/*
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* TODO: need a way to get this from the driver and EC. For now,
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* pick a magic lowest common denominator value.
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*/
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ec_max_outsize = EC_HOST_PARAM_SIZE - 8;
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return 0;
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}
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