On Fri, 16 Dec 2016, Thierry Escande wrote:
> From: Shawn Nematbakhsh <sha...@chromium.org>
>
> 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 <sha...@chromium.org>
> Signed-off-by: Thierry Escande <thierry.esca...@collabora.com>
> ---
> drivers/mfd/cros_ec.c | 49
> ++++++++++++++++++++++++++++++++++++
> include/linux/mfd/cros_ec_commands.h | 14 +++++++++++
> 2 files changed, 63 insertions(+)
Applied, thanks.
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index ad48633..b8a5080 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 76728ff..4d55132 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -2304,6 +2304,20 @@ 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 */
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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