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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: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
hifive-unleashed-5.1
Shawn Nematbakhsh 2016-12-16 18:57:37 +01:00 committed by Lee Jones
parent a9eb186e13
commit f00c06fd98
2 changed files with 63 additions and 0 deletions
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49
drivers/mfd/cros_ec.c
View File

@ -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,

14
include/linux/mfd/cros_ec_commands.h
View File

@ -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 */