Re: [PATCH v1 1/2] platform/x86/amd/pmf: Use existing input event codes to update system states

[Mario Limonciello <mario.limonciello@xxxxxxx>]

On 7/2/2024 3:06, Shyam Sundar S K wrote:
> At present, the PMF driver employs custom system state codes to update
> system states. It is recommended to replace these with existing input
> event codes (KEY_SLEEP, KEY_SUSPEND, and KEY_SCREENLOCK) to align system
> updates with the PMF-TA output actions.
>
> Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@xxxxxxx>
> Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@xxxxxxx>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> ---
>   drivers/platform/x86/amd/pmf/pmf.h    |  2 +
>   drivers/platform/x86/amd/pmf/tee-if.c | 62 +++++++++++++++++++++------
>   2 files changed, 52 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
> index eeedd0c0395a..753d5662c080 100644
> --- a/drivers/platform/x86/amd/pmf/pmf.h
> +++ b/drivers/platform/x86/amd/pmf/pmf.h
> @@ -12,6 +12,7 @@
>   #define PMF_H
>   
>   #include <linux/acpi.h>
> +#include <linux/input.h>
>   #include <linux/platform_profile.h>
>   
>   #define POLICY_BUF_MAX_SZ		0x4b000
> @@ -300,6 +301,7 @@ struct amd_pmf_dev {
>   	void __iomem *policy_base;
>   	bool smart_pc_enabled;
>   	u16 pmf_if_version;
> +	struct input_dev *pmf_idev;
>   };
>   
>   struct apmf_sps_prop_granular_v2 {
> diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
> index b438de4d6bfc..b0449f912048 100644
> --- a/drivers/platform/x86/amd/pmf/tee-if.c
> +++ b/drivers/platform/x86/amd/pmf/tee-if.c
> @@ -62,18 +62,12 @@ static void amd_pmf_prepare_args(struct amd_pmf_dev *dev, int cmd,
>   	param[0].u.memref.shm_offs = 0;
>   }
>   
> -static int amd_pmf_update_uevents(struct amd_pmf_dev *dev, u16 event)
> +static void amd_pmf_update_uevents(struct amd_pmf_dev *dev, u16 event)
>   {
> -	char *envp[2] = {};
> -
> -	envp[0] = kasprintf(GFP_KERNEL, "EVENT_ID=%d", event);
> -	if (!envp[0])
> -		return -EINVAL;
> -
> -	kobject_uevent_env(&dev->dev->kobj, KOBJ_CHANGE, envp);
> -
> -	kfree(envp[0]);
> -	return 0;
> +	input_report_key(dev->pmf_idev, event, 1); /* key press */
> +	input_sync(dev->pmf_idev);
> +	input_report_key(dev->pmf_idev, event, 0); /* key release */
> +	input_sync(dev->pmf_idev);
>   }
>   
>   static void amd_pmf_apply_policies(struct amd_pmf_dev *dev, struct ta_pmf_enact_result *out)
> @@ -149,7 +143,20 @@ static void amd_pmf_apply_policies(struct amd_pmf_dev *dev, struct ta_pmf_enact_
>   			break;
>   
>   		case PMF_POLICY_SYSTEM_STATE:
> -			amd_pmf_update_uevents(dev, val);
> +			switch (val) {
> +			case 0:
> +				amd_pmf_update_uevents(dev, KEY_SLEEP);
> +				break;
> +			case 1:
> +				amd_pmf_update_uevents(dev, KEY_SUSPEND);
> +				break;
> +			case 2:
> +				amd_pmf_update_uevents(dev, KEY_SCREENLOCK);
> +				break;
> +			default:
> +				dev_err(dev->dev, "Invalid PMF policy system state: %d\n", val);
> +			}
> +
>   			dev_dbg(dev->dev, "update SYSTEM_STATE: %s\n",
>   				amd_pmf_uevent_as_str(val));
>   			break;
> @@ -368,6 +375,30 @@ static int amd_pmf_ta_open_session(struct tee_context *ctx, u32 *id)
>   	return rc;
>   }
>   
> +static int amd_pmf_register_input_device(struct amd_pmf_dev *dev)
> +{
> +	int err;
> +
> +	dev->pmf_idev = devm_input_allocate_device(dev->dev);
> +	if (!dev->pmf_idev)
> +		return -ENOMEM;
> +
> +	dev->pmf_idev->name = "PMF-TA output events";
> +	dev->pmf_idev->phys = "amd-pmf/input0";
> +
> +	input_set_capability(dev->pmf_idev, EV_KEY, KEY_SLEEP);
> +	input_set_capability(dev->pmf_idev, EV_KEY, KEY_SCREENLOCK);
> +	input_set_capability(dev->pmf_idev, EV_KEY, KEY_SUSPEND);
> +
> +	err = input_register_device(dev->pmf_idev);
> +	if (err) {
> +		dev_err(dev->dev, "Failed to register input device: %d\n", err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
>   static int amd_pmf_tee_init(struct amd_pmf_dev *dev)
>   {
>   	u32 size;
> @@ -475,6 +506,10 @@ int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev)
>   	if (pb_side_load)
>   		amd_pmf_open_pb(dev, dev->dbgfs_dir);
>   
> +	ret = amd_pmf_register_input_device(dev);
> +	if (ret)
> +		goto error;
> +
>   	return 0;
>   
>   error:
> @@ -488,6 +523,9 @@ void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev)
>   	if (pb_side_load && dev->esbin)
>   		amd_pmf_remove_pb(dev);
>   
> +	if (dev->pmf_idev)
> +		input_unregister_device(dev->pmf_idev);
> +
>   	cancel_delayed_work_sync(&dev->pb_work);
>   	kfree(dev->prev_data);
>   	dev->prev_data = NULL;