ryu: add a dummy power module for controlling sensors.

With this change we can use power event to configure sensors
and trigger motion detection in suspend.

BUG=chrome-os-partner:31071
BRANCH=ToT
TEST=Check power states. Check power up messages and commands are
present at the console.

Message at boot:
[0.007142 hash start 0x00010000 0x000096dd]
[0.007293 Inits done]
[0.007506 power state 2 = S3, in 0x0000]
[0.007765 power state 3 = S0, in 0x0000]
[0.007908 event set 0x00002000]
[0.008021 hostcmd init 0x2000]
[0.146870 hash done
f87d7824b439db923d270df016af5aabec51b73505b7c4faa6e40c16b12dd392]

Change-Id: I9c56fe5203506462f0820bbc8a5fe4528f6805ac
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/226881
Reviewed-by: Sheng-liang Song <ssl@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>

board/ryu_sh/board.c

@@ -9,6 +9,7 @@
 #include "gpio.h"
 #include "hooks.h"
 #include "i2c.h"
+#include "power.h"
 #include "registers.h"
 #include "task.h"
 #include "util.h"
@@ -21,6 +22,12 @@ static void board_init(void)
 }
 DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
 
+/* power signal list.  Must match order of enum power_signal. */
+const struct power_signal_info power_signal_list[] = {
+	{GPIO_AP_IN_SUSPEND,  1, "SUSPEND_ASSERTED"},
+};
+BUILD_ASSERT(ARRAY_SIZE(power_signal_list) == POWER_SIGNAL_COUNT);
+
 /* I2C ports */
 const struct i2c_port_t i2c_ports[] = {
 	{"master", I2C_PORT_MASTER, 100,

board/ryu_sh/board.h

@@ -19,10 +19,15 @@
 #define CC_DEFAULT     CC_ALL
 
 /* Optional features */
+#undef CONFIG_EXTPOWER
+#undef CONFIG_HIBERNATE
 #define CONFIG_STM_HWTIMER32
 #define CONFIG_I2C
 #define CONFIG_BOARD_PRE_INIT
 #undef  CONFIG_LID_SWITCH
+#undef CONFIG_CMD_POWER_AP
+#define CONFIG_POWER_COMMON
+#define CONFIG_CHIPSET_ECDRIVEN
 #define CONFIG_VBOOT_HASH
 #undef CONFIG_WATCHDOG_HELP
 
@@ -46,6 +51,13 @@
 
 #include "gpio_signal.h"
 
+enum power_signal {
+	ECDRIVEN_SUSPEND_ASSERTED,
+
+	/* Number of power signals */
+	POWER_SIGNAL_COUNT
+};
+
 #endif /* !__ASSEMBLER__ */
 
 #endif /* __BOARD_H */

board/ryu_sh/ec.tasklist

@@ -19,4 +19,5 @@
 #define CONFIG_TASK_LIST \
 	TASK_ALWAYS(HOOKS, hook_task, NULL, LARGER_TASK_STACK_SIZE) \
 	TASK_NOTEST(HOSTCMD, host_command_task, NULL, TASK_STACK_SIZE) \
+	TASK_NOTEST(CHIPSET, chipset_task, NULL, TASK_STACK_SIZE) \
 	TASK_ALWAYS(CONSOLE, console_task, NULL, TASK_STACK_SIZE)

board/ryu_sh/gpio.inc

@@ -6,6 +6,7 @@
  */
 
 /* Interrupts */
+GPIO(AP_IN_SUSPEND,        E, 9,  GPIO_INT_BOTH,                   power_signal_interrupt)
 /*
  * TODO(gwendal): Follow Rambus work.
  * Combined accelerometer input. This will become an interrupt, once we have
@@ -21,7 +22,6 @@ GPIO(SH_IRQ_L,             A, 11, GPIO_OUT_LOW,  NULL)
 GPIO(LID_CLOSED,           A,  2, GPIO_INPUT,  NULL)
 GPIO(BASE_PRESENT,         A,  3, GPIO_INPUT,  NULL)
 GPIO(COMPASS_DRDY,         B, 11, GPIO_INPUT,  NULL)
-GPIO(AP_IN_SUSPEND,        B, 15, GPIO_INPUT,  NULL)
 
 #if 0
 /* Alternate functions */

common/chipset.c

@@ -17,6 +17,7 @@
 /*****************************************************************************/
 /* Console commands */
 
+#ifdef CONFIG_CMD_POWER_AP
 static int command_apreset(int argc, char **argv)
 {
 	int is_cold = 1;
@@ -45,3 +46,4 @@ DECLARE_CONSOLE_COMMAND(apshutdown, command_apshutdown,
 			NULL,
 			"Force AP shutdown",
 			NULL);
+#endif

include/config.h

@@ -327,6 +327,7 @@
 #define CONFIG_CMD_PD
 #undef CONFIG_CMD_PLL
 #undef CONFIG_CMD_PMU
+#define CONFIG_CMD_POWER_AP
 #define CONFIG_CMD_POWERINDEBUG
 #undef CONFIG_CMD_POWERLED
 #undef CONFIG_CMD_RTC_ALARM
@@ -480,6 +481,9 @@
  */
 #undef CONFIG_EOPTION
 
+/* Include code for handling external power */
+#define CONFIG_EXTPOWER
+
 /* Support turbo-mode chargers */
 #undef CONFIG_EXTPOWER_FALCO
 

power/build.mk

@@ -7,6 +7,7 @@
 #
 
 power-$(CONFIG_CHIPSET_BAYTRAIL)+=baytrail.o
+power-$(CONFIG_CHIPSET_ECDRIVEN)+=ec_driven.o
 power-$(CONFIG_CHIPSET_GAIA)+=gaia.o
 power-$(CONFIG_CHIPSET_HASWELL)+=haswell.o
 power-$(CONFIG_CHIPSET_IVYBRIDGE)+=ivybridge.o

power/common.c

@@ -328,6 +328,7 @@ static void power_lid_change(void)
 }
 DECLARE_HOOK(HOOK_LID_CHANGE, power_lid_change, HOOK_PRIO_DEFAULT);
 
+#ifdef CONFIG_EXTPOWER
 static void power_ac_change(void)
 {
 	if (extpower_is_present()) {
@@ -342,6 +343,7 @@ static void power_ac_change(void)
 	}
 }
 DECLARE_HOOK(HOOK_AC_CHANGE, power_ac_change, HOOK_PRIO_DEFAULT);
+#endif
 
 /*****************************************************************************/
 /* Interrupts */

power/ec_driven.c

@@ -0,0 +1,55 @@
+/* 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.
+ */
+
+/*
+ * Dummy power module for Sensor HUB.
+ *
+ * This implements the following features:
+ * when AP_IN_SUSPEND is low, in S0, otherwise S3.
+ *
+ */
+
+#include "chipset.h"  /* This module implements chipset functions too */
+#include "common.h"
+#include "console.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "power.h"
+#include "task.h"
+#include "util.h"
+
+/* Console output macros */
+#define CPUTS(outstr) cputs(CC_CHIPSET, outstr)
+#define CPRINTS(format, args...) cprints(CC_CHIPSET, format, ## args)
+
+#define IN_SUSPEND POWER_SIGNAL_MASK(ECDRIVEN_SUSPEND_ASSERTED)
+
+enum power_state power_chipset_init(void)
+{
+	return POWER_S3;
+}
+
+enum power_state power_handle_state(enum power_state state)
+{
+	switch (state) {
+	case POWER_S3:
+		if (!(power_get_signals() & IN_SUSPEND)) {
+			hook_notify(HOOK_CHIPSET_RESUME);
+			return POWER_S0;
+		}
+		return state;
+
+	case POWER_S0:
+		if (power_get_signals() & IN_SUSPEND) {
+			hook_notify(HOOK_CHIPSET_SUSPEND);
+			return POWER_S3;
+		}
+		return state;
+	default:
+		CPRINTS("Unexpected state: $d", state);
+	}
+
+	return state;
+}