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Commit f00c06fd authored by Shawn Nematbakhsh's avatar Shawn Nematbakhsh Committed by Lee Jones
Browse files

mfd: cros_ec: Send suspend state notification to EC 



Notify EC when going to or returning from suspend so that proper actions
related to wake events can be taken.

Signed-off-by: default avatarShawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: default avatarThierry Escande <thierry.escande@collabora.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent a9eb186e

drivers/mfd/cros_ec.c

+49 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/module.h>

#include <linux/mfd/core.h>

#include <linux/mfd/cros_ec.h>

#include <linux/suspend.h>

#include <asm/unaligned.h>



#define CROS_EC_DEV_EC_INDEX 0
@@ -65,6 +66,24 @@ static irqreturn_t ec_irq_thread(int irq, void *data) 
	return IRQ_HANDLED;

}



static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)

{

	struct {

		struct cros_ec_command msg;

		struct ec_params_host_sleep_event req;

	} __packed buf;



	memset(&buf, 0, sizeof(buf));



	buf.req.sleep_event = sleep_event;



	buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;

	buf.msg.version = 0;

	buf.msg.outsize = sizeof(buf.req);



	return cros_ec_cmd_xfer(ec_dev, &buf.msg);

}



int cros_ec_register(struct cros_ec_device *ec_dev)

{

	struct device *dev = ec_dev->dev;
@@ -136,6 +155,15 @@ int cros_ec_register(struct cros_ec_device *ec_dev) 
		}

	}



	/*

	 * Clear sleep event - this will fail harmlessly on platforms that

	 * don't implement the sleep event host command.

	 */

	err = cros_ec_sleep_event(ec_dev, 0);

	if (err < 0)

		dev_dbg(ec_dev->dev, "Error %d clearing sleep event to ec",

			err);



	dev_info(dev, "Chrome EC device registered\n");



	return 0;
@@ -159,6 +187,16 @@ EXPORT_SYMBOL(cros_ec_remove); 
int cros_ec_suspend(struct cros_ec_device *ec_dev)

{

	struct device *dev = ec_dev->dev;

	int ret;

	u8 sleep_event;



	sleep_event = pm_suspend_via_firmware() ? HOST_SLEEP_EVENT_S3_RESUME :

						  HOST_SLEEP_EVENT_S0IX_RESUME;



	ret = cros_ec_sleep_event(ec_dev, sleep_event);

	if (ret < 0)

		dev_dbg(ec_dev->dev, "Error %d sending suspend event to ec",

			ret);



	if (device_may_wakeup(dev))

		ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq);
@@ -180,9 +218,20 @@ static void cros_ec_drain_events(struct cros_ec_device *ec_dev) 


int cros_ec_resume(struct cros_ec_device *ec_dev)

{

	int ret;

	u8 sleep_event;



	ec_dev->suspended = false;

	enable_irq(ec_dev->irq);



	sleep_event = pm_suspend_via_firmware() ? HOST_SLEEP_EVENT_S3_RESUME :

						  HOST_SLEEP_EVENT_S0IX_RESUME;



	ret = cros_ec_sleep_event(ec_dev, sleep_event);

	if (ret < 0)

		dev_dbg(ec_dev->dev, "Error %d sending resume event to ec",

			ret);



	/*

	 * In some cases, we need to distinguish between events that occur

	 * during suspend if the EC is not a wake source. For example,

include/linux/mfd/cros_ec_commands.h

+14 −0
Original line number Diff line number Diff line
@@ -2547,6 +2547,20 @@ struct ec_params_ext_power_current_limit { 
	uint32_t limit; /* in mA */

} __packed;



/* Inform the EC when entering a sleep state */

#define EC_CMD_HOST_SLEEP_EVENT 0xa9



enum host_sleep_event {

	HOST_SLEEP_EVENT_S3_SUSPEND   = 1,

	HOST_SLEEP_EVENT_S3_RESUME    = 2,

	HOST_SLEEP_EVENT_S0IX_SUSPEND = 3,

	HOST_SLEEP_EVENT_S0IX_RESUME  = 4

};



struct ec_params_host_sleep_event {

	uint8_t sleep_event;

} __packed;



/*****************************************************************************/

/* Smart battery pass-through */