| /* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "cros_ec_dev.h" |
| #include "comm-host.h" |
| #include "ec_commands.h" |
| |
| static int fd = -1; |
| |
| static int ec_command_dev(int command, int version, |
| const void *outdata, int outsize, |
| void *indata, int insize) |
| { |
| struct cros_ec_command s_cmd; |
| int r; |
| |
| s_cmd.command = command; |
| s_cmd.version = version; |
| s_cmd.result = 0xff; |
| s_cmd.outsize = outsize; |
| s_cmd.outdata = (uint8_t *)outdata; |
| s_cmd.insize = insize; |
| s_cmd.indata = indata; |
| |
| r = ioctl(fd, CROS_EC_DEV_IOCXCMD, &s_cmd); |
| if (r < 0) { |
| fprintf(stderr, "ioctl %d, errno %d (%s), EC result %d\n", |
| r, errno, strerror(errno), s_cmd.result); |
| if (errno == EAGAIN && s_cmd.result == EC_RES_IN_PROGRESS) { |
| s_cmd.command = EC_CMD_RESEND_RESPONSE; |
| r = ioctl(fd, CROS_EC_DEV_IOCXCMD, &s_cmd); |
| fprintf(stderr, |
| "ioctl %d, errno %d (%s), EC result %d\n", |
| r, errno, strerror(errno), s_cmd.result); |
| } |
| } else if (s_cmd.result != EC_RES_SUCCESS) { |
| fprintf(stderr, "EC result %d\n", s_cmd.result); |
| return -EECRESULT - s_cmd.result; |
| } |
| |
| return r; |
| } |
| |
| static int ec_readmem_dev(int offset, int bytes, void *dest) |
| { |
| struct cros_ec_readmem s_mem; |
| struct ec_params_read_memmap r_mem; |
| int r; |
| static int fake_it; |
| |
| if (!fake_it) { |
| s_mem.offset = offset; |
| s_mem.bytes = bytes; |
| s_mem.buffer = dest; |
| r = ioctl(fd, CROS_EC_DEV_IOCRDMEM, &s_mem); |
| if (r < 0 && errno == ENOTTY) |
| fake_it = 1; |
| else |
| return r; |
| } |
| |
| r_mem.offset = offset; |
| r_mem.size = bytes; |
| return ec_command_dev(EC_CMD_READ_MEMMAP, 0, |
| &r_mem, sizeof(r_mem), |
| dest, bytes); |
| } |
| |
| int comm_init_dev(void) |
| { |
| char version[80]; |
| int r; |
| char *s; |
| |
| fd = open("/dev/" CROS_EC_DEV_NAME, O_RDWR); |
| if (fd < 0) |
| return 1; |
| |
| r = read(fd, version, sizeof(version)-1); |
| if (r <= 0) { |
| close(fd); |
| return 2; |
| } |
| version[r] = '\0'; |
| s = strchr(version, '\n'); |
| if (s) |
| *s = '\0'; |
| if (strcmp(version, CROS_EC_DEV_VERSION)) { |
| close(fd); |
| return 3; |
| } |
| |
| ec_command_proto = ec_command_dev; |
| if (ec_readmem_dev(EC_MEMMAP_ID, 2, version) == 2 && |
| version[0] == 'E' && version[1] == 'C') |
| ec_readmem = ec_readmem_dev; |
| |
| /* |
| * TODO(crosbug.com/p/23823): Need a way to get this from the driver |
| * and EC. For now, pick a magic lowest common denominator value. The |
| * ec_max_outsize is set to handle v3 EC protocol. The ec_max_insize |
| * needs to be set to the largest value that can be returned from the |
| * EC, EC_PROTO2_MAX_PARAM_SIZE. |
| */ |
| ec_max_outsize = EC_PROTO2_MAX_PARAM_SIZE - 8; |
| ec_max_insize = EC_PROTO2_MAX_PARAM_SIZE; |
| |
| return 0; |
| } |