[PATCH 3/5] [loongson] yeeloong2f: add LID open event as the wakeup event

[Wu Zhangjin <wuzhangjin@xxxxxxxxx>]

Yeeloong2F netbook has an embedded controller(kb3310b) to manage the LID
action. when the LID is closed/opened, a relative SCI interrupt take
place, and the relative event is saved to a relative EC register.

This patch make the LID open action can wake up the processor from wait
mode if it in the suspend mode.

Signed-off-by: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
---
 arch/mips/include/asm/mach-loongson/loongson.h |    1 +
 arch/mips/loongson/lemote-2f/irq.c             |    4 +-
 arch/mips/loongson/lemote-2f/pm.c              |   72 ++++++++++++++++++++++++
 3 files changed, 76 insertions(+), 1 deletions(-)

diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h
index daf7041..71ce760 100644
--- a/arch/mips/include/asm/mach-loongson/loongson.h
+++ b/arch/mips/include/asm/mach-loongson/loongson.h
@@ -41,6 +41,7 @@ extern void __init bonito_irq_init(void);
 extern void __init set_irq_trigger_mode(void);
 extern void __init mach_init_irq(void);
 extern void mach_irq_dispatch(unsigned int pending);
+extern int mach_i8259_irq(void);
 
 /* We need this in some places... */
 #define delay()	({		\
diff --git a/arch/mips/loongson/lemote-2f/irq.c b/arch/mips/loongson/lemote-2f/irq.c
index 50e7bb6..77d32f9 100644
--- a/arch/mips/loongson/lemote-2f/irq.c
+++ b/arch/mips/loongson/lemote-2f/irq.c
@@ -9,6 +9,7 @@
  */
 
 #include <linux/interrupt.h>
+#include <linux/module.h>
 
 #include <asm/irq_cpu.h>
 #include <asm/i8259.h>
@@ -30,7 +31,7 @@
  * The generic i8259_irq() make the kernel hang on booting.  Since we cannot
  * get the irq via the IRR directly, we access the ISR instead.
  */
-static inline int mach_i8259_irq(void)
+int mach_i8259_irq(void)
 {
 	int irq, isr;
 
@@ -60,6 +61,7 @@ static inline int mach_i8259_irq(void)
 
 	return irq;
 }
+EXPORT_SYMBOL(mach_i8259_irq);
 
 static void i8259_irqdispatch(void)
 {
diff --git a/arch/mips/loongson/lemote-2f/pm.c b/arch/mips/loongson/lemote-2f/pm.c
index 8090d05..7202177 100644
--- a/arch/mips/loongson/lemote-2f/pm.c
+++ b/arch/mips/loongson/lemote-2f/pm.c
@@ -14,6 +14,7 @@
 #include <linux/interrupt.h>
 #include <linux/pm.h>
 #include <linux/i8042.h>
+#include <linux/module.h>
 
 #include <asm/i8259.h>
 #include <asm/mipsregs.h>
@@ -21,6 +22,8 @@
 
 #include <loongson.h>
 
+#include "ec_kb3310b.h"
+
 #define I8042_KBD_IRQ		1
 #define I8042_CTR_KBDINT	0x01
 #define I8042_CTR_KBDDIS	0x10
@@ -52,6 +55,9 @@ static int i8042_enable_kbd_port(void)
 /*
  * The i8042 is connnected to i8259A
  */
+#define PIC_CASCADE_IR 2	/* cascade irq num of i8259A */
+
+/* i8042 is connnectted to i8259A */
 void setup_wakeup_events(void)
 {
 	int irq_mask;
@@ -65,9 +71,75 @@ void setup_wakeup_events(void)
 
 		/* enable keyboard port */
 		i8042_enable_kbd_port();
+
+		/* wakeup cpu via sci with relative lid openning event */
+		outb(irq_mask & ~(1 << PIC_CASCADE_IR), PIC_MASTER_IMR);
+		inb(PIC_MASTER_IMR);
+		outb(0xff & ~(1 << (SCI_IRQ_NUM - 8)), PIC_SLAVE_IMR);
+		inb(PIC_SLAVE_IMR);
+
 		break;
 
 	default:
 		break;
 	}
 }
+
+static struct delayed_work lid_task;
+static int initialized;
+/* yeeloong_report_lid_status will be implemented in yeeloong_laptop.c */
+sci_handler yeeloong_report_lid_status;
+EXPORT_SYMBOL(yeeloong_report_lid_status);
+static void yeeloong_lid_update_task(struct work_struct *work)
+{
+	if (yeeloong_report_lid_status)
+		yeeloong_report_lid_status(BIT_LID_DETECT_ON);
+}
+
+int wakeup_loongson(void)
+{
+	int irq;
+
+	/* query the interrupt number */
+	irq = mach_i8259_irq();
+	if (irq < 0)
+		return 0;
+
+	printk(KERN_INFO "irq = %d\n", irq);
+
+	if (irq == I8042_KBD_IRQ)
+		return 1;
+	else if (irq == SCI_IRQ_NUM) {
+		int ret, sci_event;
+		/* query the event number */
+		ret = ec_query_seq(CMD_GET_EVENT_NUM);
+		if (ret < 0)
+			return 0;
+		sci_event = ec_get_event_num();
+		if (sci_event < 0)
+			return 0;
+		if (sci_event == EVENT_LID) {
+			int lid_status;
+			/* check the LID status */
+			lid_status = ec_read(REG_LID_DETECT);
+			/* wakeup cpu when people open the LID */
+			if (lid_status == BIT_LID_DETECT_ON) {
+				/* if we call it directly here, the WARNING
+				 * will happen at line 98 of
+				 * kerenl/time/timekeeping.c (getnstimeofday)
+				 * via "WARN_ON(timekeeping_suspended);" because,
+				 * currently, we are in the suspend status
+				 */
+				if (initialized == 0) {
+					/* init the rfkill work task */
+					INIT_DELAYED_WORK(&lid_task, yeeloong_lid_update_task);
+					initialized = 1;
+				}
+				schedule_delayed_work(&lid_task, 1);
+				return 1;
+			}
+		}
+	}
+
+	return 0;
+}
-- 
1.6.2.1