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https://github.com/Telecominfraproject/OpenCellular.git
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d0d1564434
This is preparation for the common userspace EC interface. If/when that appears, this will be ready. BUG=chromium:239197 BRANCH=all TEST=manual Build, install, run it. Shouldn't be any change. Change-Id: I9fa78515ec5443ba659f10a66bbaadcb7f4802b0 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/56131
78 lines
1.6 KiB
C
78 lines
1.6 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 <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "comm-host.h"
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#include "ec_commands.h"
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int (*ec_command)(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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int (*ec_readmem)(int offset, int bytes, void *dest);
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int comm_init_dev(void) __attribute__((weak));
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int comm_init_lpc(void) __attribute__((weak));
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int comm_init_i2c(void) __attribute__((weak));
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static int fake_readmem(int offset, int bytes, void *dest)
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{
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struct ec_params_read_memmap p;
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int c;
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char *buf;
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p.offset = offset;
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if (bytes) {
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p.size = bytes;
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c = ec_command(EC_CMD_READ_MEMMAP, 0, &p, sizeof(p),
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dest, p.size);
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if (c < 0)
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return c;
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return p.size;
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}
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p.size = EC_MEMMAP_TEXT_MAX;
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c = ec_command(EC_CMD_READ_MEMMAP, 0, &p, sizeof(p), dest, p.size);
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if (c < 0)
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return c;
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buf = dest;
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for (c = 0; c < EC_MEMMAP_TEXT_MAX; c++) {
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if (buf[c] == 0)
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return c;
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}
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buf[EC_MEMMAP_TEXT_MAX - 1] = 0;
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return EC_MEMMAP_TEXT_MAX - 1;
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}
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int comm_init(void)
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{
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/* Default memmap access */
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ec_readmem = fake_readmem;
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/* Prefer new /dev method */
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if (comm_init_dev && !comm_init_dev())
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return 0;
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/* Fallback to direct LPC on x86 */
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if (comm_init_lpc && !comm_init_lpc())
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return 0;
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/* Fallback to direct i2c on ARM */
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if (comm_init_i2c && !comm_init_i2c())
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return 0;
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/* Give up */
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fprintf(stderr, "Unable to establish host communication\n");
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return 1;
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}
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