cb1ed9e117
Yeeloong 2F netbook has an KB3310B embedded controller to manage the LID action. When the LID is closed or opened a SCI interrupt is sent out and the corresponding event is saved to an EC register for later query. Allow the LID open interrupt to wake the processor from wait mode if it is in the suspend mode. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
/*
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* Lemote loongson2f family machines' specific suspend support
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*
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* Copyright (C) 2009 Lemote Inc.
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* Author: Wu Zhangjin <wuzj@lemote.com>
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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 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/suspend.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/i8042.h>
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#include <linux/module.h>
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#include <asm/i8259.h>
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#include <asm/mipsregs.h>
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#include <asm/bootinfo.h>
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#include <loongson.h>
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#include "ec_kb3310b.h"
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#define I8042_KBD_IRQ 1
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#define I8042_CTR_KBDINT 0x01
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#define I8042_CTR_KBDDIS 0x10
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static unsigned char i8042_ctr;
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static int i8042_enable_kbd_port(void)
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{
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if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
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pr_err("i8042.c: Can't read CTR while enabling i8042 kbd port."
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"\n");
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return -EIO;
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}
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i8042_ctr &= ~I8042_CTR_KBDDIS;
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i8042_ctr |= I8042_CTR_KBDINT;
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if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
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i8042_ctr &= ~I8042_CTR_KBDINT;
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i8042_ctr |= I8042_CTR_KBDDIS;
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pr_err("i8042.c: Failed to enable KBD port.\n");
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return -EIO;
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}
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return 0;
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}
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void setup_wakeup_events(void)
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{
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int irq_mask;
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switch (mips_machtype) {
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case MACH_LEMOTE_ML2F7:
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case MACH_LEMOTE_YL2F89:
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/* open the keyboard irq in i8259A */
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outb((0xff & ~(1 << I8042_KBD_IRQ)), PIC_MASTER_IMR);
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irq_mask = inb(PIC_MASTER_IMR);
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/* enable keyboard port */
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i8042_enable_kbd_port();
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/* Wakeup CPU via SCI lid open event */
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outb(irq_mask & ~(1 << PIC_CASCADE_IR), PIC_MASTER_IMR);
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inb(PIC_MASTER_IMR);
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outb(0xff & ~(1 << (SCI_IRQ_NUM - 8)), PIC_SLAVE_IMR);
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inb(PIC_SLAVE_IMR);
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break;
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default:
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break;
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}
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}
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static struct delayed_work lid_task;
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static int initialized;
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/* yeeloong_report_lid_status will be implemented in yeeloong_laptop.c */
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sci_handler yeeloong_report_lid_status;
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EXPORT_SYMBOL(yeeloong_report_lid_status);
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static void yeeloong_lid_update_task(struct work_struct *work)
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{
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if (yeeloong_report_lid_status)
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yeeloong_report_lid_status(BIT_LID_DETECT_ON);
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}
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int wakeup_loongson(void)
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{
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int irq;
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/* query the interrupt number */
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irq = mach_i8259_irq();
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if (irq < 0)
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return 0;
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printk(KERN_INFO "%s: irq = %d\n", __func__, irq);
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if (irq == I8042_KBD_IRQ)
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return 1;
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else if (irq == SCI_IRQ_NUM) {
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int ret, sci_event;
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/* query the event number */
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ret = ec_query_seq(CMD_GET_EVENT_NUM);
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if (ret < 0)
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return 0;
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sci_event = ec_get_event_num();
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if (sci_event < 0)
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return 0;
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if (sci_event == EVENT_LID) {
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int lid_status;
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/* check the LID status */
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lid_status = ec_read(REG_LID_DETECT);
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/* wakeup cpu when people open the LID */
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if (lid_status == BIT_LID_DETECT_ON) {
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/* If we call it directly here, the WARNING
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* will be sent out by getnstimeofday
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* via "WARN_ON(timekeeping_suspended);"
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* because we can not schedule in suspend mode.
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*/
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if (initialized == 0) {
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INIT_DELAYED_WORK(&lid_task,
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yeeloong_lid_update_task);
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initialized = 1;
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}
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schedule_delayed_work(&lid_task, 1);
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return 1;
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}
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}
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}
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return 0;
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}
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