| David Hendricks | 42ad652 | 2011-08-09 16:08:10 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the flashrom project. |
| 3 | * |
| 4 | * Copyright (C) 2011 The Chromium OS Authors |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | * |
| 19 | * power.c: power management routines |
| 20 | */ |
| 21 | |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include "flash.h" /* for msg_* */ |
| 26 | #include "power.h" |
| 27 | |
| 28 | enum pm_state { |
| 29 | PM_OFF, |
| 30 | PM_ON, |
| 31 | }; |
| 32 | |
| 33 | /* power management daemons used in Chromium OS */ |
| 34 | static struct chromiumos_pm { |
| 35 | enum pm_state powerd; /* power management running inside minijail */ |
| 36 | enum pm_state powerm; /* power management running outside minijail */ |
| 37 | } pm_state_at_start; |
| 38 | |
| 39 | static int pm_disabled; |
| 40 | |
| 41 | /* disable power management and set pm_state_at_start as an output */ |
| 42 | int disable_power_management() |
| 43 | { |
| 44 | if (pm_disabled) { |
| 45 | msg_pdbg("%s: Nothing to do.\n", __func__); |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | msg_pdbg("%s: Disabling power management services.\n", __func__); |
| 50 | |
| 51 | /* if the service terminates successfully, then it was running when |
| 52 | * flashrom was invoked */ |
| 53 | if (system("stop powerd >/dev/null") == 0) |
| 54 | pm_state_at_start.powerd = PM_ON; |
| 55 | else |
| 56 | pm_state_at_start.powerd = PM_OFF; |
| 57 | |
| 58 | if (system("stop powerm >/dev/null") == 0) |
| 59 | pm_state_at_start.powerm = PM_ON; |
| 60 | else |
| 61 | pm_state_at_start.powerm = PM_OFF; |
| 62 | |
| 63 | pm_disabled = 1; |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | /* (re-)enable power management */ |
| 68 | int restore_power_management() |
| 69 | { |
| 70 | int rc = 0; |
| 71 | |
| 72 | if (!pm_disabled) { |
| 73 | msg_pdbg("%s(): Power management enabled\n", __func__); |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | msg_pdbg("%s: (Re-)Enabling power management services\n", __func__); |
| 78 | |
| 79 | if (pm_state_at_start.powerd == PM_ON) { |
| 80 | if (system("start powerd >/dev/null") != 0) { |
| 81 | msg_perr("Cannot restart powerd service\n"); |
| 82 | rc |= 1; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | if (pm_state_at_start.powerm == PM_ON) { |
| 87 | if (system("start powerm >/dev/null") != 0) { |
| 88 | msg_perr("Cannot restart powerm service\n"); |
| 89 | rc |= 1; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | pm_disabled = 0; |
| 94 | return rc; |
| 95 | } |