diff options
| author | Shawn Nematbakhsh <shawnn@chromium.org> | 2016-12-16 18:57:37 +0100 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2017-02-13 09:29:42 +0000 |
| commit | f00c06fd98576face871e62bb3aa045c5f647661 (patch) | |
| tree | 4d90315ad420e0bfca71db76f197efa9869bcb70 | |
| parent | a9eb186e13144782232cc6fa731441be54baf505 (diff) | |
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>
| -rw-r--r-- | drivers/mfd/cros_ec.c | 49 | ||||
| -rw-r--r-- | include/linux/mfd/cros_ec_commands.h | 14 |
2 files changed, 63 insertions, 0 deletions
diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c index ad48633c9a47..b8a50808bedb 100644 --- a/drivers/mfd/cros_ec.c +++ b/drivers/mfd/cros_ec.c @@ -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, diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h index da1c188562bc..34ecae4d612c 100644 --- a/include/linux/mfd/cros_ec_commands.h +++ b/include/linux/mfd/cros_ec_commands.h @@ -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 */ |