From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DFBD17C211; Wed, 1 Jul 2026 00:34:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782866075; cv=none; b=idIhNv7obgqOGwx7eFCUQpMYoLJkvrjAr/cY4LCrpkpZ3at4Q+0FvlIzer+z35Wtv+3WHx5H+UGZ5EHqQTC2goHsCrYlmviCMiqsfFZOnYz2SoBChdUTVrtCUcb2/s1Gx1TbFJsOYF1TO5k8GBSmy0aWFMxnb3zMBdK1UakQYgw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782866075; c=relaxed/simple; bh=jp4oa+nB/LFZ04j1MBHx15gKEFiIydrLUbj2ORutANA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nOANovICL63lEuaTb+1zo3/0Vn2CN2cXe0ur8A8A8xc6EvPF5tMVIRHOlDQ9JY+lH1rEXsuX83qN909U0jS9Buiw9WWsOptl6v0ghLfjRLSZpHFljddgLEX557AE5b2w/BDWDJK+TT9cBGpPLSbGw8rZFPELOzWt3HtDqq/ZSFE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=niEuF4FN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="niEuF4FN" Received: by smtp.kernel.org (Postfix) with ESMTPS id F26F3C2BCC7; Wed, 1 Jul 2026 00:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1782866075; bh=jp4oa+nB/LFZ04j1MBHx15gKEFiIydrLUbj2ORutANA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=niEuF4FNFy6Ry/TjM8q5oh4mYfFh/NyuqN4eagemDhyL23U3iRwt+NttewYVQR3Om zRFKvHrlKzhGrpracB2PV4oEthwfqDTnzluCTzxPJglEShJcNZKpVdiIo+numCQwoQ TlFEBQrkn8EeqBpwz0S0yHJSYvmcsedeS8XvJBM3fBjODYnjbcn4097p4nx2hWe+Ih sbvEQZibnZSExhKc6dzWV7VeiYVGB+syHjGVBLd0zWnNAvz4JyQL2caVx70S/UNgnK LXraGisK9LUKR+U2IbJ/equLb8+TTX/nm23AB7eHVU50izb6OYkhjeHryzqzypIYWJ eUU0ZYX2zJKHw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD6C1C44500; Wed, 1 Jul 2026 00:34:34 +0000 (UTC) From: Amit Sunil Dhamne via B4 Relay Date: Wed, 01 Jul 2026 00:34:19 +0000 Subject: [PATCH v4 2/2] usb: typec: tcpm: Add support for Battery Status response message Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260701-batt-status-v4-2-a31d97b1ae57@google.com> References: <20260701-batt-status-v4-0-a31d97b1ae57@google.com> In-Reply-To: <20260701-batt-status-v4-0-a31d97b1ae57@google.com> To: Sebastian Reichel , Badhri Jagan Sridharan , Heikki Krogerus , Greg Kroah-Hartman , Hans de Goede , Krzysztof Kozlowski , Marek Szyprowski , Sebastian Krzyszkowiak , Purism Kernel Team Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, =?utf-8?q?Andr=C3=A9_Draszik?= , Tudor Ambarus , Peter Griffin , RD Babiera , Kyle Tso , Amit Sunil Dhamne X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1782866074; l=9494; i=amitsd@google.com; s=20241031; h=from:subject:message-id; bh=d1NfTj8UswSEtak3ZClTJoRISHYAGPQ9HC5PINs5qhU=; b=m7oXzbzD/ZH6reZapHdMkkRdrKT7inH8x6morkfBnr+e+hF4GiKqI6K/vTbxFqgVXlHIw+ocu pChxnL2bBWkBnmUHbTZ4GXsR8CkXJ3jTLaGOBk/S38njPF62jxByTrQ X-Developer-Key: i=amitsd@google.com; a=ed25519; pk=wD+XZSST4dmnNZf62/lqJpLm7fiyT8iv462zmQ3H6bI= X-Endpoint-Received: by B4 Relay for amitsd@google.com/20241031 with auth_id=262 X-Original-From: Amit Sunil Dhamne Reply-To: amitsd@google.com From: Amit Sunil Dhamne Add support for responding to a Get_Battery_Status request with a Battery_Status message. The port partner shall request the status of a port's battery by providing an index in the Get_Battery_Status AMS. In case of failure to identify the battery, the port shall reply with an appropriate message indicating so. Support for Battery_Status message is required for sinks that contain battery as specified in USB PD Rev3.1 v1.8 ("Applicability of Data Messages" section). Signed-off-by: Amit Sunil Dhamne Reviewed-by: Badhri Jagan Sridharan --- drivers/usb/typec/tcpm/tcpm.c | 135 +++++++++++++++++++++++++++++++++++++++++- include/linux/usb/pd.h | 29 +++++++++ 2 files changed, 161 insertions(+), 3 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 7ef746a90a17..19daa17917a7 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -232,7 +232,8 @@ enum pd_msg_request { PD_MSG_DATA_SINK_CAP, PD_MSG_DATA_SOURCE_CAP, PD_MSG_DATA_REV, - PD_MSG_EXT_SINK_CAP_EXT + PD_MSG_EXT_SINK_CAP_EXT, + PD_MSG_DATA_BATT_STATUS }; enum adev_actions { @@ -389,6 +390,14 @@ struct pd_timings { /* Convert microwatt to watt */ #define UW_TO_W(pow) ((pow) / 1000000) +/* + * As per USB PD Spec Rev 3.18 (Sec. 6.5.13.11), the number of fixed batteries + * that a port can be queried is restricted to 4. + */ +#define MAX_NUM_FIXED_BATT 4 + +#define BATTERY_PROPERTY_UNKNOWN 0xffff + /* * struct pd_identifier - Contains info about PD identifiers * @vid: Vendor ID (assigned by USB-IF) @@ -683,6 +692,9 @@ struct tcpm_port { struct pd_identifier pd_ident; struct sink_caps_ext_data sink_caps_ext; + struct power_supply **fixed_batt; + u32 fixed_batt_cnt; + u32 batt_request_id; #ifdef CONFIG_DEBUG_FS struct dentry *dentry; struct mutex logbuffer_lock; /* log buffer access lock */ @@ -1470,6 +1482,20 @@ static int tcpm_pd_send_sink_caps(struct tcpm_port *port) return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); } +static void tcpm_get_fixed_batt(struct tcpm_port *port) +{ + int ret; + + if (!port->self_powered || port->fixed_batt_cnt > 0) + return; + + ret = power_supply_get_system_batteries(port->dev, &port->fixed_batt); + if (ret < 0) + tcpm_log(port, "Failed to get battery array, ret=%d", ret); + else + port->fixed_batt_cnt = ret; +} + static int tcpm_pd_send_sink_cap_ext(struct tcpm_port *port) { u16 operating_snk_watt = port->operating_snk_mw / 1000; @@ -1482,6 +1508,8 @@ static int tcpm_pd_send_sink_cap_ext(struct tcpm_port *port) if (!port->self_powered) data->spr_op_pdp = operating_snk_watt; + tcpm_get_fixed_batt(port); + /* * SPR Sink Minimum PDP indicates the minimum power required to operate * a sink device in its lowest level of functionality without requiring @@ -1507,6 +1535,7 @@ static int tcpm_pd_send_sink_cap_ext(struct tcpm_port *port) skedb.load_step = data->load_step; skedb.load_char = cpu_to_le16(data->load_char); skedb.compliance = data->compliance; + skedb.batt_info = min(port->fixed_batt_cnt, MAX_NUM_FIXED_BATT); skedb.modes = data->modes; skedb.spr_min_pdp = data->spr_min_pdp; skedb.spr_op_pdp = data->spr_op_pdp; @@ -1525,6 +1554,88 @@ static int tcpm_pd_send_sink_cap_ext(struct tcpm_port *port) port->message_id, data_obj_cnt, 1 /* Denotes if ext header */)); + + return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); +} + +static int tcpm_pd_send_batt_status(struct tcpm_port *port) +{ + u16 present_charge = BATTERY_PROPERTY_UNKNOWN; + bool batt_present = false, invalid_ref = true; + u32 batt_id = port->batt_request_id; + union power_supply_propval val; + struct power_supply *batt; + u8 charging_status = 0; + struct pd_message msg; + int ret, charge_now; + u64 energy_now; + u32 bsdo; + + tcpm_get_fixed_batt(port); + memset(&msg, 0, sizeof(msg)); + + if (batt_id >= port->fixed_batt_cnt || batt_id >= MAX_NUM_FIXED_BATT) + goto send_status; + + invalid_ref = false; + batt = port->fixed_batt[batt_id]; + ret = power_supply_get_property(batt, POWER_SUPPLY_PROP_PRESENT, &val); + if (ret) + tcpm_log(port, + "Failed to fetch power_supply_prop_present ret %d", + ret); + else + batt_present = val.intval > 0; + + ret = power_supply_get_property(batt, POWER_SUPPLY_PROP_CHARGE_NOW, + &val); + if (!ret) { + charge_now = val.intval; + + ret = power_supply_get_property(batt, + POWER_SUPPLY_PROP_VOLTAGE_AVG, + &val); + if (!ret) { + energy_now = ((u64)charge_now * val.intval) / 1000000; + + /* + * Battery Present Charge is reported in + * increments of 0.1WH. + */ + present_charge = (u16)UW_TO_W(energy_now * 10); + } + } + + ret = power_supply_get_property(batt, POWER_SUPPLY_PROP_STATUS, &val); + if (!ret) { + switch (val.intval) { + case POWER_SUPPLY_STATUS_CHARGING: + charging_status = BSDO_BATTERY_INFO_CHARGING; + break; + case POWER_SUPPLY_STATUS_DISCHARGING: + charging_status = BSDO_BATTERY_INFO_DISCHARGING; + break; + case POWER_SUPPLY_STATUS_NOT_CHARGING: + case POWER_SUPPLY_STATUS_FULL: + charging_status = BSDO_BATTERY_INFO_IDLE; + break; + default: + charging_status = BSDO_BATTERY_INFO_RSVD; + break; + } + } + +send_status: + + bsdo = BSDO(present_charge, charging_status, batt_present, invalid_ref); + msg.payload[0] = cpu_to_le32(bsdo); + msg.header = PD_HEADER_LE(PD_DATA_BATT_STATUS, + port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, + 1); + return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); } @@ -3886,6 +3997,7 @@ static void tcpm_pd_ext_msg_request(struct tcpm_port *port, { enum pd_ext_msg_type type = pd_header_type_le(msg->header); unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header); + const struct pd_chunked_ext_message_data *ext_msg = &msg->ext_msg; /* stopping VDM state machine if interrupted by other Messages */ if (tcpm_vdm_ams(port)) { @@ -3894,7 +4006,7 @@ static void tcpm_pd_ext_msg_request(struct tcpm_port *port, mod_vdm_delayed_work(port, 0); } - if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) { + if (!(le16_to_cpu(ext_msg->header) & PD_EXT_HDR_CHUNKED)) { tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS); tcpm_log(port, "Unchunked extended messages unsupported"); return; @@ -3919,9 +4031,17 @@ static void tcpm_pd_ext_msg_request(struct tcpm_port *port, NONE_AMS, 0); } break; + case PD_EXT_GET_BATT_STATUS: + if (data_size >= 1) { + port->batt_request_id = ext_msg->data[0]; + tcpm_pd_handle_msg(port, PD_MSG_DATA_BATT_STATUS, + GETTING_BATTERY_STATUS); + } else { + tcpm_set_state(port, SOFT_RESET_SEND, 0); + } + break; case PD_EXT_SOURCE_CAP_EXT: case PD_EXT_GET_BATT_CAP: - case PD_EXT_GET_BATT_STATUS: case PD_EXT_BATT_CAP: case PD_EXT_GET_MANUFACTURER_INFO: case PD_EXT_MANUFACTURER_INFO: @@ -4132,6 +4252,14 @@ static bool tcpm_send_queued_message(struct tcpm_port *port) ret); tcpm_ams_finish(port); break; + case PD_MSG_DATA_BATT_STATUS: + ret = tcpm_pd_send_batt_status(port); + if (ret) + tcpm_log(port, + "Failed to send battery status ret=%d", + ret); + tcpm_ams_finish(port); + break; default: break; } @@ -8633,6 +8761,7 @@ void tcpm_unregister_port(struct tcpm_port *port) hrtimer_cancel(&port->vdm_state_machine_timer); hrtimer_cancel(&port->state_machine_timer); + power_supply_put_system_batteries(port->fixed_batt, port->fixed_batt_cnt); tcpm_reset_port(port); tcpm_port_unregister_pd(port); diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h index 337a5485af7c..afb9c2c65588 100644 --- a/include/linux/usb/pd.h +++ b/include/linux/usb/pd.h @@ -724,4 +724,33 @@ void usb_power_delivery_unlink_device(struct usb_power_delivery *pd, struct devi #endif /* CONFIG_TYPEC */ +/* Battery Status Data Object */ +#define BSDO_PRESENT_CAPACITY GENMASK(31, 16) +#define BSDO_CHG_STATUS GENMASK(11, 10) +#define BSDO_BATTERY_PRESENT BIT(9) +#define BSDO_INVALID_BATTERY_REFERENCE BIT(8) + +/* + * Battery Charge Status: Battery Charging Status Values as defined in + * "USB PD Spec Rev3.1 Ver1.8", "Table 6-46 Battery Status Data Object (BSDO)". + */ +#define BSDO_BATTERY_INFO_CHARGING 0x0 +#define BSDO_BATTERY_INFO_DISCHARGING 0x1 +#define BSDO_BATTERY_INFO_IDLE 0x2 +#define BSDO_BATTERY_INFO_RSVD 0x3 + +/** + * BSDO() - Pack data into Battery Status Data Object format. + * @batt_charge: Battery's present state of charge in 0.1WH increment. + * @chg_status: Battery charge status. + * @batt_present: Indicates that battery is present/attached when set else absent when unset. + * @invalid_ref: Indicates that an invalid battery reference was made in the Get_Battery_Status + * request. + */ +#define BSDO(batt_charge, chg_status, batt_present, invalid_ref) \ + ((FIELD_PREP(BSDO_PRESENT_CAPACITY, batt_charge)) | \ + (FIELD_PREP(BSDO_CHG_STATUS, chg_status)) | \ + ((batt_present) ? BSDO_BATTERY_PRESENT : 0) | \ + ((invalid_ref) ? BSDO_INVALID_BATTERY_REFERENCE : 0)) + #endif /* __LINUX_USB_PD_H */ -- 2.55.0.rc0.799.gd6f94ed593-goog