133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
// hd-idle - spin down idle hard disks
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// Copyright (C) 2018 Andoni del Olmo
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package sgio
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import (
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"fmt"
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"github.com/benmcclelland/sgio"
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"os"
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)
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const (
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sgAta16 = 0x85 // ATA PASS-THROUGH(16)
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sgAta12 = 0xa1 // ATA PASS-THROUGH (12)
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sgAtaProtoNonData = 3 << 1
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ataUsingLba = 1 << 6
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ataOpStandbyNow1 = 0xe0 // https://wiki.osdev.org/ATA/ATAPI_Power_Management
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ataOpStandbyNow2 = 0x94 // Retired in ATA4. Did not coexist with ATAPI.
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)
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func StopAtaDevice(device string, debug bool) error {
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f, err := openDevice(device)
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if err != nil {
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return err
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}
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switch NewAtaDevice(device, debug).deviceType() {
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case Jmicron:
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if err = sendSgio(f, jmicronGetRegisters(), debug); err != nil {
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return err
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}
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if debug {
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fmt.Println(" issuing standby command")
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}
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if err = sendSgio(f, jmicronStandby(), debug); err != nil {
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return err
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}
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return nil
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default:
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if debug {
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fmt.Println(" issuing standby command")
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}
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if err = sendAtaCommand(f, ataOpStandbyNow1, debug); err != nil {
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if err = sendAtaCommand(f, ataOpStandbyNow2, debug); err != nil {
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return err
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}
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}
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}
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if err := f.Close(); err != nil {
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return fmt.Errorf("cannot close file %s. Error: %s", device, err)
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}
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return nil
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}
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func jmicronGetRegisters() []uint8 {
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cbd := []uint8{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} // len 12
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cbd[0] = 0xdf
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cbd[1] = 0x10 // read
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cbd[4] = 0x01
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cbd[6] = 0x72
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cbd[7] = 0x0f
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cbd[11] = 0xfd
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return cbd
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}
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func jmicronStandby() []uint8 {
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cbd := []uint8{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} // len 12
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cbd[0] = 0xdf
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cbd[1] = 0x10
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cbd[10] = 0xa0 // device port. either 0xa0 or 0xb0
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cbd[11] = ataOpStandbyNow1
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return cbd
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}
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func sendAtaCommand(f *os.File, command uint8, debug bool) error {
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cbd := []uint8{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} // len 16
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cbd[0] = sgAta16
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cbd[1] = sgAtaProtoNonData
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cbd[13] = ataUsingLba
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cbd[14] = command
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return sendSgio(f, cbd, debug)
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}
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func sendSgio(f *os.File, inqCmdBlk []uint8, debug bool) error {
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senseBuf := make([]byte, sgio.SENSE_BUF_LEN)
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ioHdr := &sgio.SgIoHdr{
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InterfaceID: 'S', // 0 4
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DxferDirection: SgDxferNone, // 4 4
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CmdLen: uint8(len(inqCmdBlk)), // 8 1
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MxSbLen: sgio.SENSE_BUF_LEN, // 9 1
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Cmdp: &inqCmdBlk[0], // 24 8
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Sbp: &senseBuf[0], // 32 8
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Timeout: 0, // 40 4
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}
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if debug {
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dumpBytes(inqCmdBlk)
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}
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if err := sgio.SgioSyscall(f, ioHdr); err != nil {
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return err
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}
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if err := sgio.CheckSense(ioHdr, &senseBuf); err != nil {
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return err
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}
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return nil
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}
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func dumpBytes(p []uint8) {
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fmt.Print("outgoing cdb: ")
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for i := range p {
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fmt.Printf("%02x ", p[i])
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}
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fmt.Print("\n")
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}
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