From patchwork Mon Jul 31 17:06:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Travkin X-Patchwork-Id: 708661 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 403F0C04FE2 for ; Mon, 31 Jul 2023 17:11:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233557AbjGaRLg (ORCPT ); Mon, 31 Jul 2023 13:11:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232941AbjGaRLW (ORCPT ); Mon, 31 Jul 2023 13:11:22 -0400 Received: from box.trvn.ru (box.trvn.ru [194.87.146.52]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AED2835A8; Mon, 31 Jul 2023 10:07:45 -0700 (PDT) Received: from authenticated-user (box.trvn.ru [194.87.146.52]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.trvn.ru (Postfix) with ESMTPSA id 63BA242449; Mon, 31 Jul 2023 22:06:45 +0500 (+05) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=trvn.ru; s=mail; t=1690823205; bh=dy9OhMPgkv6mGaKpif4r7aV9aD//zp0p5RkNyfGYR+A=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=oWj7Eyi/CEh6yi6Gmr6BQDs2NOs7EV3adkYoy4k/Il2oWQWDcs81Ifcrb3acRZDFa Ur9CIBRJ3foEU5q5uYmgkH9meAiJ9qhLXFTbus8qf/i+yOm88LUIxiC5TOm7j1rFPw ADcSlihPqXx8POzbRzgKmWSGYw/HmfNkemKRb6M9W4EKbeS1QT6+XAloJLIp+4lo4f 6B/KDc6dl3ORPpoOBdcYnm3d3b+MXvricsgD/b5M1bIU4XdSrv++aPorJSKb15ALmo wHYHwVEtX4zQo7t39sk2cIVxBzPu2gVsSfrceMlznlTiOFXkyTo33om0YCQFsysRhn euCokZA1WfRAA== From: Nikita Travkin Date: Mon, 31 Jul 2023 22:06:26 +0500 Subject: [PATCH v2 3/4] power: supply: Add pm8916 VM-BMS support MIME-Version: 1.0 Message-Id: <20230731-pm8916-bms-lbc-v2-3-82a4ebb39c16@trvn.ru> References: <20230731-pm8916-bms-lbc-v2-0-82a4ebb39c16@trvn.ru> In-Reply-To: <20230731-pm8916-bms-lbc-v2-0-82a4ebb39c16@trvn.ru> To: Sebastian Reichel , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Nikita Travkin X-Developer-Signature: v=1; a=openpgp-sha256; l=11200; i=nikita@trvn.ru; h=from:subject:message-id; bh=dy9OhMPgkv6mGaKpif4r7aV9aD//zp0p5RkNyfGYR+A=; b=owEBbQKS/ZANAwAIAUMc7O4oGb91AcsmYgBkx+oijQMpAqRsd5huFWQ1WCdzFVTIFnMUmFNr9 q/TYsyF2kaJAjMEAAEIAB0WIQTAhK9UUj+qg34uxUdDHOzuKBm/dQUCZMfqIgAKCRBDHOzuKBm/ dcfOD/0Twat822cuHAN8g+gWaVO4B9OzlmvPAi1qnrwoHYIoRS8xwsUn9x07rRm4mZt5ZOhaziF 9ehBhZp1xn9+58pbeN/PYB5nZmjrDkmejinGTv0aA1xJo3hhoadQKGB98iDHKS7cOpgmbH4XN8O cQrtiOqcEapfeHMTlfln8iO8dExONjCtmzWIAGPRF4uMkNPK7kizvJASxn8tlzcTD8PWIdxmega DfOASjDYt+maY4r7weTxiwOHGpT4KbU3FD0cqHcy5h3QxcECdmVpxvf2+YuoPKFZ4LPjsgRbauz nMEwHfXLf2f9jhOp+W+eU97n9ke+GuL92R/GtP5n9F/p4wOxpMKG4wLZpc7RK6XYm6UjnxSGgl0 m1bp6x3QTbpW1B/tC88W9haB+UI2hcEzoO6kGoX5GmRbF+HAfR66fiT451Uusa1BvM6ZVOxMJz2 9JlmKqH+ciJu5PgoYbjcw6uP5ZfcGI5SHPHo9WbXsaOtcXT4geZtP4oDhKg6xOlDekgUtHw3cwc FlDZV1RRoCHGTUjvBz3wiqhAmBBSp/vPXdwQWv/J4o+/XKhdvvwCk7lo72uf6tY2k6zQc9SXOmu LH9XS20S64akP9VwgMY9Yk5r9y8bURsWUA3DxK/C3dtwqRHChkNKl2jiaGFa6ga6U1WRErgiI5c MssAei7oBl4GvDw== X-Developer-Key: i=nikita@trvn.ru; a=openpgp; fpr=C084AF54523FAA837E2EC547431CECEE2819BF75 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This driver adds basic support for VM-BMS found in pm8916. VM-BMS is a very basic fuel-gauge hardware block that is, sadly, incapable of any gauging. The hardware supports measuring OCV in sleep mode, where the battery is not in use, or measuring average voltage over time when the device is active. This driver implements basic value readout from this block. Signed-off-by: Nikita Travkin --- v2: Get irq by name --- drivers/power/supply/Kconfig | 11 ++ drivers/power/supply/Makefile | 1 + drivers/power/supply/pm8916_bms_vm.c | 296 +++++++++++++++++++++++++++++++++++ 3 files changed, 308 insertions(+) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index 663a1c423806..e93a5a4d03e2 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -629,6 +629,17 @@ config CHARGER_QCOM_SMBB documentation for more detail. The base name for this driver is 'pm8941_charger'. +config BATTERY_PM8916_BMS_VM + tristate "Qualcomm PM8916 BMS-VM support" + depends on MFD_SPMI_PMIC || COMPILE_TEST + help + Say Y to add support for Voltage Mode BMS block found in some + Qualcomm PMICs such as PM8916. This hardware block provides + battery voltage monitoring for the system. + + To compile this driver as module, choose M here: the + module will be called pm8916_bms_vm. + config CHARGER_BQ2415X tristate "TI BQ2415x battery charger driver" depends on I2C diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index a8a9fa6de1e9..fdf7916f80ed 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -84,6 +84,7 @@ obj-$(CONFIG_CHARGER_MP2629) += mp2629_charger.o obj-$(CONFIG_CHARGER_MT6360) += mt6360_charger.o obj-$(CONFIG_CHARGER_MT6370) += mt6370-charger.o obj-$(CONFIG_CHARGER_QCOM_SMBB) += qcom_smbb.o +obj-$(CONFIG_BATTERY_PM8916_BMS_VM) += pm8916_bms_vm.o obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o diff --git a/drivers/power/supply/pm8916_bms_vm.c b/drivers/power/supply/pm8916_bms_vm.c new file mode 100644 index 000000000000..6cf00bf1c466 --- /dev/null +++ b/drivers/power/supply/pm8916_bms_vm.c @@ -0,0 +1,296 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023, Nikita Travkin + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PM8916_PERPH_TYPE 0x04 +#define PM8916_BMS_VM_TYPE 0x020D + +#define PM8916_SEC_ACCESS 0xD0 +#define PM8916_SEC_MAGIC 0xA5 + +#define PM8916_BMS_VM_STATUS1 0x08 +#define PM8916_BMS_VM_FSM_STATE(x) (((x) & 0b00111000) >> 3) +#define PM8916_BMS_VM_FSM_STATE_S2 0x2 + +#define PM8916_BMS_VM_MODE_CTL 0x40 +#define PM8916_BMS_VM_MODE_FORCE_S3 (BIT(0) | BIT(1)) +#define PM8916_BMS_VM_MODE_NORMAL (BIT(1) | BIT(3)) + +#define PM8916_BMS_VM_EN_CTL 0x46 +#define PM8916_BMS_ENABLED BIT(7) + +#define PM8916_BMS_VM_FIFO_LENGTH_CTL 0x47 +#define PM8916_BMS_VM_S1_SAMPLE_INTERVAL_CTL 0x55 +#define PM8916_BMS_VM_S2_SAMPLE_INTERVAL_CTL 0x56 +#define PM8916_BMS_VM_S3_S7_OCV_DATA0 0x6A +#define PM8916_BMS_VM_BMS_FIFO_REG_0_LSB 0xC0 + +/* Using only 1 fifo is broken in hardware */ +#define PM8916_BMS_VM_FIFO_COUNT 2 /* 2 .. 8 */ + +#define PM8916_BMS_VM_S1_SAMPLE_INTERVAL 10 +#define PM8916_BMS_VM_S2_SAMPLE_INTERVAL 10 + +struct pm8916_bms_vm_battery { + struct device *dev; + struct power_supply *battery; + struct power_supply_battery_info *info; + struct regmap *regmap; + unsigned int reg; + unsigned int last_ocv; + unsigned int vbat_now; +}; + +static int pm8916_bms_vm_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct pm8916_bms_vm_battery *bat = power_supply_get_drvdata(psy); + struct power_supply_battery_info *info = bat->info; + int supplied; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + supplied = power_supply_am_i_supplied(psy); + + if (supplied < 0 && supplied != -ENODEV) + return supplied; + else if (supplied && supplied != -ENODEV) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + return 0; + + case POWER_SUPPLY_PROP_HEALTH: + if (bat->vbat_now < info->voltage_min_design_uv) + val->intval = POWER_SUPPLY_HEALTH_DEAD; + else if (bat->vbat_now > info->voltage_max_design_uv) + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else + val->intval = POWER_SUPPLY_HEALTH_GOOD; + return 0; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + val->intval = bat->vbat_now; + return 0; + + case POWER_SUPPLY_PROP_VOLTAGE_BOOT: + /* Returning last known ocv value here - it changes after suspend. */ + val->intval = bat->last_ocv; + return 0; + + default: + return -EINVAL; + } +} + +static enum power_supply_property pm8916_bms_vm_battery_properties[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_BOOT, + POWER_SUPPLY_PROP_HEALTH, +}; + +static irqreturn_t pm8916_bms_vm_fifo_update_done_irq(int irq, void *data) +{ + struct pm8916_bms_vm_battery *bat = data; + u16 vbat_data[PM8916_BMS_VM_FIFO_COUNT]; + int ret; + + ret = regmap_bulk_read(bat->regmap, bat->reg + PM8916_BMS_VM_BMS_FIFO_REG_0_LSB, + &vbat_data, PM8916_BMS_VM_FIFO_COUNT * 2); + if (ret) + return IRQ_HANDLED; + + /* + * The VM-BMS hardware only collects voltage data and the software + * has to process it to calculate the OCV and SoC. Hardware provides + * up to 8 averaged measurements for software to take in account. + * + * Just use the last measured value for now to report the current + * battery voltage. + */ + bat->vbat_now = vbat_data[PM8916_BMS_VM_FIFO_COUNT - 1] * 300; + + power_supply_changed(bat->battery); + + return IRQ_HANDLED; +} + +static const struct power_supply_desc pm8916_bms_vm_battery_psy_desc = { + .name = "pm8916-bms-vm", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = pm8916_bms_vm_battery_properties, + .num_properties = ARRAY_SIZE(pm8916_bms_vm_battery_properties), + .get_property = pm8916_bms_vm_battery_get_property, +}; + +static int pm8916_bms_vm_battery_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct pm8916_bms_vm_battery *bat; + struct power_supply_config psy_cfg = {}; + int ret, irq; + unsigned int tmp; + + bat = devm_kzalloc(dev, sizeof(*bat), GFP_KERNEL); + if (!bat) + return -ENOMEM; + + bat->dev = dev; + + bat->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!bat->regmap) + return -ENODEV; + + of_property_read_u32(dev->of_node, "reg", &bat->reg); + if (bat->reg < 0) + return -EINVAL; + + irq = platform_get_irq_byname(pdev, "fifo"); + if (irq < 0) + return irq; + + ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_bms_vm_fifo_update_done_irq, + IRQF_ONESHOT, "pm8916_vm_bms", bat); + if (ret) + return ret; + + ret = regmap_bulk_read(bat->regmap, bat->reg + PM8916_PERPH_TYPE, &tmp, 2); + if (ret) + goto comm_error; + + if (tmp != PM8916_BMS_VM_TYPE) + return dev_err_probe(dev, -ENODEV, "Device reported wrong type: 0x%X\n", tmp); + + ret = regmap_write(bat->regmap, bat->reg + PM8916_BMS_VM_S1_SAMPLE_INTERVAL_CTL, + PM8916_BMS_VM_S1_SAMPLE_INTERVAL); + if (ret) + goto comm_error; + ret = regmap_write(bat->regmap, bat->reg + PM8916_BMS_VM_S2_SAMPLE_INTERVAL_CTL, + PM8916_BMS_VM_S2_SAMPLE_INTERVAL); + if (ret) + goto comm_error; + ret = regmap_write(bat->regmap, bat->reg + PM8916_BMS_VM_FIFO_LENGTH_CTL, + PM8916_BMS_VM_FIFO_COUNT << 4 | PM8916_BMS_VM_FIFO_COUNT); + if (ret) + goto comm_error; + ret = regmap_write(bat->regmap, + bat->reg + PM8916_BMS_VM_EN_CTL, PM8916_BMS_ENABLED); + if (ret) + goto comm_error; + + ret = regmap_bulk_read(bat->regmap, + bat->reg + PM8916_BMS_VM_S3_S7_OCV_DATA0, &tmp, 2); + if (ret) + goto comm_error; + + bat->last_ocv = tmp * 300; + bat->vbat_now = bat->last_ocv; + + psy_cfg.drv_data = bat; + psy_cfg.of_node = dev->of_node; + + bat->battery = devm_power_supply_register(dev, &pm8916_bms_vm_battery_psy_desc, &psy_cfg); + if (IS_ERR(bat->battery)) + return dev_err_probe(dev, PTR_ERR(bat->battery), "Unable to register battery\n"); + + ret = power_supply_get_battery_info(bat->battery, &bat->info); + if (ret) + return dev_err_probe(dev, ret, "Unable to get battery info\n"); + + platform_set_drvdata(pdev, bat); + + return 0; + +comm_error: + return dev_err_probe(dev, ret, "Unable to communicate with device\n"); +} + +static int pm8916_bms_vm_battery_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct pm8916_bms_vm_battery *bat = platform_get_drvdata(pdev); + int ret; + + /* + * Due to a hardware quirk the FSM doesn't switch states normally. + * Instead we unlock the debug registers and force S3 (Measure OCV/Sleep) + * mode every time we suspend. + */ + + ret = regmap_write(bat->regmap, + bat->reg + PM8916_SEC_ACCESS, PM8916_SEC_MAGIC); + if (ret) + goto error; + ret = regmap_write(bat->regmap, + bat->reg + PM8916_BMS_VM_MODE_CTL, PM8916_BMS_VM_MODE_FORCE_S3); + if (ret) + goto error; + + return 0; + +error: + dev_err(bat->dev, "Failed to force S3 mode: %pe\n", ERR_PTR(ret)); + return ret; +} + +static int pm8916_bms_vm_battery_resume(struct platform_device *pdev) +{ + struct pm8916_bms_vm_battery *bat = platform_get_drvdata(pdev); + int ret; + unsigned int tmp; + + ret = regmap_bulk_read(bat->regmap, + bat->reg + PM8916_BMS_VM_S3_S7_OCV_DATA0, &tmp, 2); + + bat->last_ocv = tmp * 300; + + ret = regmap_write(bat->regmap, + bat->reg + PM8916_SEC_ACCESS, PM8916_SEC_MAGIC); + if (ret) + goto error; + ret = regmap_write(bat->regmap, + bat->reg + PM8916_BMS_VM_MODE_CTL, PM8916_BMS_VM_MODE_NORMAL); + if (ret) + goto error; + + return 0; + +error: + dev_err(bat->dev, "Failed to return normal mode: %pe\n", ERR_PTR(ret)); + return ret; +} + +static const struct of_device_id pm8916_bms_vm_battery_of_match[] = { + { .compatible = "qcom,pm8916-bms-vm", }, + { }, +}; +MODULE_DEVICE_TABLE(of, pm8916_bms_vm_battery_of_match); + +static struct platform_driver pm8916_bms_vm_battery_driver = { + .driver = { + .name = "pm8916-bms-vm", + .of_match_table = of_match_ptr(pm8916_bms_vm_battery_of_match), + }, + .probe = pm8916_bms_vm_battery_probe, + .suspend = pm8916_bms_vm_battery_suspend, + .resume = pm8916_bms_vm_battery_resume, +}; +module_platform_driver(pm8916_bms_vm_battery_driver); + +MODULE_DESCRIPTION("pm8916 BMS-VM driver"); +MODULE_AUTHOR("Nikita Travkin "); +MODULE_LICENSE("GPL"); From patchwork Mon Jul 31 17:06:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Travkin X-Patchwork-Id: 708660 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6CC5C04A94 for ; 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a=openpgp; fpr=C084AF54523FAA837E2EC547431CECEE2819BF75 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org pm8916 LBC is a Linear Battery Charger hardware block in pm8916 PMIC. This block implements simple CC/CV charging for Li-Po batteries. The hardware has internal state machine to switch between modes and works mostly autonomously, only needing the limits and targets to be set to operate. This driver allows setting limits and enabling the LBC block, monitoring it's state. Signed-off-by: Nikita Travkin --- v2: Fix missed warnings, get irq by name --- drivers/power/supply/Kconfig | 11 ++ drivers/power/supply/Makefile | 1 + drivers/power/supply/pm8916_lbc.c | 383 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 395 insertions(+) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index e93a5a4d03e2..a2ea249a57c6 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -640,6 +640,17 @@ config BATTERY_PM8916_BMS_VM To compile this driver as module, choose M here: the module will be called pm8916_bms_vm. +config CHARGER_PM8916_LBC + tristate "Qualcomm PM8916 Linear Battery Charger support" + depends on MFD_SPMI_PMIC || COMPILE_TEST + help + Say Y here to add support for Linear Battery Charger block + found in some Qualcomm PMICs such as PM8916. This hardware + blokc provides simple CC/CV battery charger. + + To compile this driver as module, choose M here: the + module will be called pm8916_lbc. + config CHARGER_BQ2415X tristate "TI BQ2415x battery charger driver" depends on I2C diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index fdf7916f80ed..e4bd9eb1261b 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -85,6 +85,7 @@ obj-$(CONFIG_CHARGER_MT6360) += mt6360_charger.o obj-$(CONFIG_CHARGER_MT6370) += mt6370-charger.o obj-$(CONFIG_CHARGER_QCOM_SMBB) += qcom_smbb.o obj-$(CONFIG_BATTERY_PM8916_BMS_VM) += pm8916_bms_vm.o +obj-$(CONFIG_CHARGER_PM8916_LBC) += pm8916_lbc.o obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o diff --git a/drivers/power/supply/pm8916_lbc.c b/drivers/power/supply/pm8916_lbc.c new file mode 100644 index 000000000000..490cb7064dbf --- /dev/null +++ b/drivers/power/supply/pm8916_lbc.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023, Nikita Travkin + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Two bytes: type + subtype */ +#define PM8916_PERPH_TYPE 0x04 +#define PM8916_LBC_CHGR_TYPE 0x1502 +#define PM8916_LBC_BAT_IF_TYPE 0x1602 +#define PM8916_LBC_USB_TYPE 0x1702 +#define PM8916_LBC_MISC_TYPE 0x1802 + +#define PM8916_LBC_CHGR_CHG_OPTION 0x08 +#define PM8916_LBC_CHGR_PMIC_CHARGER BIT(7) + +#define PM8916_LBC_CHGR_CHG_STATUS 0x09 + +#define PM8916_INT_RT_STS 0x10 + +#define PM8916_LBC_USB_USBIN_VALID BIT(1) + +#define PM8916_LBC_CHGR_VDD_MAX 0x40 +#define PM8916_LBC_CHGR_VDD_SAFE 0x41 +#define PM8916_LBC_CHGR_IBAT_MAX 0x44 +#define PM8916_LBC_CHGR_IBAT_SAFE 0x45 + +#define PM8916_LBC_CHGR_TCHG_MAX_EN 0x60 +#define PM8916_LBC_CHGR_TCHG_MAX_ENABLED BIT(7) +#define PM8916_LBC_CHGR_TCHG_MAX 0x61 + +#define PM8916_LBC_CHGR_CHG_CTRL 0x49 +#define PM8916_LBC_CHGR_CHG_EN BIT(7) +#define PM8916_LBC_CHGR_PSTG_EN BIT(5) + +#define PM8916_LBC_CHGR_MIN_CURRENT 90000 +#define PM8916_LBC_CHGR_MAX_CURRENT 1440000 + +#define PM8916_LBC_CHGR_MIN_VOLTAGE 4000000 +#define PM8916_LBC_CHGR_MAX_VOLTAGE 4775000 +#define PM8916_LBC_CHGR_VOLTAGE_STEP 25000 + +#define PM8916_LBC_CHGR_MIN_TIME 4 +#define PM8916_LBC_CHGR_MAX_TIME 256 + +struct pm8916_lbc_charger { + struct device *dev; + struct extcon_dev *edev; + struct power_supply *charger; + struct power_supply_battery_info *info; + struct regmap *regmap; + unsigned int reg[4]; + bool online; + unsigned int charge_voltage_max; + unsigned int charge_voltage_safe; + unsigned int charge_current_max; + unsigned int charge_current_safe; +}; + +static const unsigned int pm8916_lbc_charger_cable[] = { + EXTCON_USB, + EXTCON_NONE, +}; + +enum { + LBC_CHGR = 0, + LBC_BAT_IF, + LBC_USB, + LBC_MISC, +}; + +static int pm8916_lbc_charger_configure(struct pm8916_lbc_charger *chg) +{ + int ret = 0; + unsigned int tmp; + + chg->charge_voltage_max = clamp_t(u32, chg->charge_voltage_max, + PM8916_LBC_CHGR_MIN_VOLTAGE, chg->charge_voltage_safe); + + tmp = chg->charge_voltage_max - PM8916_LBC_CHGR_MIN_VOLTAGE; + tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP; + chg->charge_voltage_max = PM8916_LBC_CHGR_MIN_VOLTAGE + tmp * PM8916_LBC_CHGR_VOLTAGE_STEP; + + ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_MAX, tmp); + if (ret) + goto error; + + chg->charge_current_max = min(chg->charge_current_max, chg->charge_current_safe); + + tmp = clamp_t(u32, chg->charge_current_max, + PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT); + + tmp = chg->charge_current_max / PM8916_LBC_CHGR_MIN_CURRENT - 1; + chg->charge_current_max = (tmp + 1) * PM8916_LBC_CHGR_MIN_CURRENT; + + ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_MAX, tmp); + if (ret) + goto error; + + ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_CTRL, + PM8916_LBC_CHGR_CHG_EN | PM8916_LBC_CHGR_PSTG_EN); + if (ret) + goto error; + + return ret; + +error: + dev_err(chg->dev, "Failed to configure charging: %pe\n", ERR_PTR(ret)); + return ret; +} + +static int pm8916_lbc_charger_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval = chg->online; + return 0; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + val->intval = chg->charge_voltage_max; + return 0; + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + val->intval = chg->charge_current_max; + return 0; + + default: + return -EINVAL; + }; +} + +static int pm8916_lbc_charger_set_property(struct power_supply *psy, + enum power_supply_property prop, + const union power_supply_propval *val) +{ + struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy); + + switch (prop) { + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + chg->charge_current_max = val->intval; + return pm8916_lbc_charger_configure(chg); + default: + return -EINVAL; + } +} + +static int pm8916_lbc_charger_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return true; + default: + return false; + } +} + +static enum power_supply_property pm8916_lbc_charger_properties[] = { + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, +}; + +static irqreturn_t pm8916_lbc_charger_state_changed_irq(int irq, void *data) +{ + struct pm8916_lbc_charger *chg = data; + unsigned int tmp; + int ret; + + ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp); + if (ret) + return IRQ_HANDLED; + + chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID); + extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online); + + power_supply_changed(chg->charger); + + return IRQ_HANDLED; +} + +static int pm8916_lbc_charger_probe_dt(struct pm8916_lbc_charger *chg) +{ + struct device *dev = chg->dev; + struct device_node *np = dev->of_node; + int ret = 0; + unsigned int tmp; + + ret = of_property_read_u32(np, "qcom,fast-charge-safe-voltage", &chg->charge_voltage_safe); + if (ret) + return ret; + if (chg->charge_voltage_safe < PM8916_LBC_CHGR_MIN_VOLTAGE) + return -EINVAL; + + chg->charge_voltage_safe = clamp_t(u32, chg->charge_voltage_safe, + PM8916_LBC_CHGR_MIN_VOLTAGE, PM8916_LBC_CHGR_MAX_VOLTAGE); + + tmp = chg->charge_voltage_safe - PM8916_LBC_CHGR_MIN_VOLTAGE; + tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP; + ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_SAFE, tmp); + if (ret) + return ret; + + ret = of_property_read_u32(np, "qcom,fast-charge-safe-current", &chg->charge_current_safe); + if (ret) + return ret; + if (chg->charge_current_safe < PM8916_LBC_CHGR_MIN_CURRENT) + return -EINVAL; + + chg->charge_current_safe = clamp_t(u32, chg->charge_current_safe, + PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT); + + chg->charge_current_max = chg->charge_current_safe; + + tmp = chg->charge_current_safe / PM8916_LBC_CHGR_MIN_CURRENT - 1; + ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_SAFE, tmp); + if (ret) + return ret; + + /* Disable charger timeout. */ + ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_TCHG_MAX_EN, 0x00); + if (ret) + return ret; + + return ret; +} + +static const struct power_supply_desc pm8916_lbc_charger_psy_desc = { + .name = "pm8916-lbc-chgr", + .type = POWER_SUPPLY_TYPE_USB, + .properties = pm8916_lbc_charger_properties, + .num_properties = ARRAY_SIZE(pm8916_lbc_charger_properties), + .get_property = pm8916_lbc_charger_get_property, + .set_property = pm8916_lbc_charger_set_property, + .property_is_writeable = pm8916_lbc_charger_property_is_writeable, +}; + +static int pm8916_lbc_charger_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct pm8916_lbc_charger *chg; + struct power_supply_config psy_cfg = {}; + int ret, len, irq; + unsigned int tmp; + + chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL); + if (!chg) + return -ENOMEM; + + chg->dev = dev; + + chg->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!chg->regmap) + return -ENODEV; + + len = of_property_count_u32_elems(dev->of_node, "reg"); + if (len < 0) + return len; + if (len != 4) + return dev_err_probe(dev, -EINVAL, + "Wrong amount of reg values: %d (4 expected)\n", len); + + irq = platform_get_irq_byname(pdev, "usb_vbus"); + if (irq < 0) + return irq; + + ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_lbc_charger_state_changed_irq, + IRQF_ONESHOT, "pm8916_lbc", chg); + if (ret) + return ret; + + ret = of_property_read_u32_array(dev->of_node, "reg", chg->reg, len); + if (ret) + return ret; + + ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_PERPH_TYPE, &tmp, 2); + if (ret) + goto comm_error; + if (tmp != PM8916_LBC_CHGR_TYPE) + goto type_error; + + ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_BAT_IF] + PM8916_PERPH_TYPE, &tmp, 2); + if (ret) + goto comm_error; + if (tmp != PM8916_LBC_BAT_IF_TYPE) + goto type_error; + + ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_USB] + PM8916_PERPH_TYPE, &tmp, 2); + if (ret) + goto comm_error; + if (tmp != PM8916_LBC_USB_TYPE) + goto type_error; + + ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_MISC] + PM8916_PERPH_TYPE, &tmp, 2); + if (ret) + goto comm_error; + if (tmp != PM8916_LBC_MISC_TYPE) + goto type_error; + + ret = regmap_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_OPTION, &tmp); + if (ret) + goto comm_error; + if (tmp != PM8916_LBC_CHGR_PMIC_CHARGER) + dev_err_probe(dev, -ENODEV, "The system is using an external charger\n"); + + ret = pm8916_lbc_charger_probe_dt(chg); + if (ret) + dev_err_probe(dev, ret, "Error while parsing device tree\n"); + + psy_cfg.drv_data = chg; + psy_cfg.of_node = dev->of_node; + + chg->charger = devm_power_supply_register(dev, &pm8916_lbc_charger_psy_desc, &psy_cfg); + if (IS_ERR(chg->charger)) + return dev_err_probe(dev, PTR_ERR(chg->charger), "Unable to register charger\n"); + + ret = power_supply_get_battery_info(chg->charger, &chg->info); + if (ret) + return dev_err_probe(dev, ret, "Unable to get battery info\n"); + + chg->edev = devm_extcon_dev_allocate(dev, pm8916_lbc_charger_cable); + if (IS_ERR(chg->edev)) + return PTR_ERR(chg->edev); + + ret = devm_extcon_dev_register(dev, chg->edev); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to register extcon device\n"); + + ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp); + if (ret) + goto comm_error; + + chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID); + extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online); + + chg->charge_voltage_max = chg->info->voltage_max_design_uv; + ret = pm8916_lbc_charger_configure(chg); + if (ret) + return ret; + + return 0; + +comm_error: + return dev_err_probe(dev, ret, "Unable to communicate with device\n"); + +type_error: + return dev_err_probe(dev, -ENODEV, "Device reported wrong type: 0x%X\n", tmp); +} + +static const struct of_device_id pm8916_lbc_charger_of_match[] = { + { .compatible = "qcom,pm8916-lbc", }, + { }, +}; +MODULE_DEVICE_TABLE(of, pm8916_lbc_charger_of_match); + +static struct platform_driver pm8916_lbc_charger_driver = { + .driver = { + .name = "pm8916-lbc", + .of_match_table = of_match_ptr(pm8916_lbc_charger_of_match), + }, + .probe = pm8916_lbc_charger_probe, +}; +module_platform_driver(pm8916_lbc_charger_driver); + +MODULE_DESCRIPTION("pm8916 LBC driver"); +MODULE_AUTHOR("Nikita Travkin "); +MODULE_LICENSE("GPL");