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Date: Tue, 25 Aug 2020 18:16:16 +0800 From: Qiwu Huang <yanziily@...il.com> To: sre@...nel.org Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org, Qiwu Huang <huangqiwu@...omi.com> Subject: [PATCH v10 3/4] power: supply: core: add wireless signal strength property From: Qiwu Huang <huangqiwu@...omi.com> reports wireless signal strength. The value show degree of coupling between tx and rx. Signed-off-by: Qiwu Huang <huangqiwu@...omi.com> --- Documentation/ABI/testing/sysfs-class-power | 22 +++++++++++++++++++++ drivers/power/supply/power_supply_sysfs.c | 1 + include/linux/power_supply.h | 1 + 3 files changed, 24 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power index 2850adbc8c58..c3a547037d07 100644 --- a/Documentation/ABI/testing/sysfs-class-power +++ b/Documentation/ABI/testing/sysfs-class-power @@ -758,3 +758,25 @@ Description: 13: ADAPTER_VOICE_BOX, 14: ADAPTER_PRIVATE_PD_50W. +What: /sys/class/power_supply/<supply_name>/signal_strength +Date: Jul 2020 +Contact: Fei Jiang <jiangfei1@...omi.com> +Description: + In PING phase, RX transmits a signal strength packet as the + first communication packet to instruct the base to keep power + signal on.The value reports wireless signal strength and show + degree of coupling. + + The Qi Wireless Power Transfer System is published by the + Wireless Power Consortium.The ping phase is the necessary stage + for matching transmitter and receiver. In this phase,the Power + Transmitter executes a Digital Ping, and listens for a response. + If the Power Transmitter discovers a Power Receiver, the Power + Transmitter may extend the Digital Ping,i.e. maintain the Power + Signal at the level of the Digital Ping. This causes the system + to proceed to the identification & configuration phase. If the + Power Transmitter does not extend the Digital Ping, the system + shall revert to the selection phase. + + Access: Read-Only + Valid values: 0 - 100 diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c index 76de6ae199d3..64e6bdd91edf 100644 --- a/drivers/power/supply/power_supply_sysfs.c +++ b/drivers/power/supply/power_supply_sysfs.c @@ -212,6 +212,7 @@ static struct power_supply_attr power_supply_attrs[] = { POWER_SUPPLY_ATTR(SERIAL_NUMBER), POWER_SUPPLY_ATTR(QUICK_CHARGE_TYPE), POWER_SUPPLY_ATTR(TX_ADAPTER), + POWER_SUPPLY_ATTR(SIGNAL_STRENGTH), }; static struct attribute * diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index 4e161d8961c1..496d1faecdd1 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -173,6 +173,7 @@ enum power_supply_property { POWER_SUPPLY_PROP_SERIAL_NUMBER, POWER_SUPPLY_PROP_QUICK_CHARGE_TYPE, POWER_SUPPLY_PROP_TX_ADAPTER, + POWER_SUPPLY_PROP_SIGNAL_STRENGTH, }; enum power_supply_type { -- 2.28.0
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