From patchwork Thu Oct 22 06:01:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mike Looijmans X-Patchwork-Id: 286746 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A040C388F9 for ; Thu, 22 Oct 2020 06:02:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ABF162244C for ; Thu, 22 Oct 2020 06:01:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2444416AbgJVGB7 (ORCPT ); Thu, 22 Oct 2020 02:01:59 -0400 Received: from jax4mhob17.registeredsite.com ([64.69.218.105]:36620 "EHLO jax4mhob17.registeredsite.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503153AbgJVGB5 (ORCPT ); Thu, 22 Oct 2020 02:01:57 -0400 X-Greylist: delayed 57057 seconds by postgrey-1.27 at vger.kernel.org; Thu, 22 Oct 2020 02:01:53 EDT Received: from mailpod.hostingplatform.com ([10.30.71.206]) by jax4mhob17.registeredsite.com (8.14.4/8.14.4) with ESMTP id 09M61owl071627 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Thu, 22 Oct 2020 02:01:51 -0400 Received: (qmail 7407 invoked by uid 0); 22 Oct 2020 06:01:50 -0000 X-TCPREMOTEIP: 83.128.90.119 X-Authenticated-UID: mike@milosoftware.com Received: from unknown (HELO phenom.domain?not?set.invalid) (mike@milosoftware.com@83.128.90.119) by 0 with ESMTPA; 22 Oct 2020 06:01:50 -0000 From: Mike Looijmans To: sre@kernel.org, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Mike Looijmans Subject: [PATCH] power/supply: Add ltc4162-l-charger Date: Thu, 22 Oct 2020 08:01:42 +0200 Message-Id: <20201022060142.26863-1-mike.looijmans@topic.nl> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Add support for the LTC4162-L Li-Ion battery charger. The driver allows reading back telemetry and to set some charging options like the input current limit. Signed-off-by: Mike Looijmans --- drivers/power/supply/Kconfig | 8 + drivers/power/supply/Makefile | 1 + drivers/power/supply/ltc4162-l-charger.c | 847 +++++++++++++++++++++++ 3 files changed, 856 insertions(+) create mode 100644 drivers/power/supply/ltc4162-l-charger.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index faf2830aa152..ce5c35d08bb5 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -508,6 +508,14 @@ config CHARGER_LT3651 Say Y to include support for the Analog Devices (Linear Technology) LT3651 battery charger which reports its status via GPIO lines. +config CHARGER_LTC4162L + tristate "LTC4162-L charger" + depends on I2C + select REGMAP_I2C + help + Say Y to include support for the Analog Devices (Linear Technology) + LTC4162-L battery charger connected to I2C. + config CHARGER_MAX14577 tristate "Maxim MAX14577/77836 battery charger driver" depends on MFD_MAX14577 diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index b3c694a65114..fe6881d6ef0f 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -70,6 +70,7 @@ obj-$(CONFIG_CHARGER_LP8788) += lp8788-charger.o obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o obj-$(CONFIG_CHARGER_LT3651) += lt3651-charger.o +obj-$(CONFIG_CHARGER_LTC4162L) += ltc4162-l-charger.o obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o diff --git a/drivers/power/supply/ltc4162-l-charger.c b/drivers/power/supply/ltc4162-l-charger.c new file mode 100644 index 000000000000..4560a1ac5a08 --- /dev/null +++ b/drivers/power/supply/ltc4162-l-charger.c @@ -0,0 +1,847 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC. + * Copyright (C) 2020, Topic Embedded Products + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Registers (names based on what datasheet uses) */ +#define LTC4162L_EN_LIMIT_ALERTS_REG 0x0D +#define LTC4162L_EN_CHARGER_STATE_ALERTS_REG 0x0E +#define LTC4162L_EN_CHARGE_STATUS_ALERTS_REG 0x0F +#define LTC4162L_CONFIG_BITS_REG 0x14 +#define LTC4162L_IIN_LIMIT_TARGET 0x15 +#define LTC4162L_ARM_SHIP_MODE 0x19 +#define LTC4162L_CHARGE_CURRENT_SETTING 0X1A +#define LTC4162L_VCHARGE_SETTING 0X1B +#define LTC4162L_C_OVER_X_THRESHOLD 0x1C +#define LTC4162L_MAX_CV_TIME 0X1D +#define LTC4162L_MAX_CHARGE_TIME 0X1E +#define LTC4162L_CHARGER_CONFIG_BITS 0x29 +#define LTC4162L_CHARGER_STATE 0x34 +#define LTC4162L_CHARGE_STATUS 0x35 +#define LTC4162L_LIMIT_ALERTS_REG 0x36 +#define LTC4162L_CHARGER_STATE_ALERTS_REG 0x37 +#define LTC4162L_CHARGE_STATUS_ALERTS_REG 0x38 +#define LTC4162L_SYSTEM_STATUS_REG 0x39 +#define LTC4162L_VBAT 0x3A +#define LTC4162L_VIN 0x3B +#define LTC4162L_VOUT 0x3C +#define LTC4162L_IBAT 0x3D +#define LTC4162L_IIN 0x3E +#define LTC4162L_DIE_TEMPERATURE 0x3F +#define LTC4162L_THERMISTOR_VOLTAGE 0x40 +#define LTC4162L_BSR 0x41 +#define LTC4162L_JEITA_REGION 0x42 +#define LTC4162L_CHEM_CELLS_REG 0x43 +#define LTC4162L_ICHARGE_DAC 0x44 +#define LTC4162L_VCHARGE_DAC 0x45 +#define LTC4162L_IIN_LIMIT_DAC 0x46 +#define LTC4162L_VBAT_FILT 0x47 +#define LTC4162L_INPUT_UNDERVOLTAGE_DAC 0x4B + +/* Enumeration as in datasheet. Individual bits are mutually exclusive. */ +enum ltc4162l_state { + battery_detection = 2048, + charger_suspended = 256, + precharge = 128, /* trickle on low bat voltage */ + cc_cv_charge = 64, /* normal charge */ + ntc_pause = 32, + timer_term = 16, + c_over_x_term = 8, /* battery is full */ + max_charge_time_fault = 4, + bat_missing_fault = 2, + bat_short_fault = 1 +}; + +/* Individual bits are mutually exclusive. Only active in charging states.*/ +enum ltc4162l_charge_status { + ilim_reg_active = 32, + thermal_reg_active = 16, + vin_uvcl_active = 8, + iin_limit_active = 4, + constant_current = 2, + constant_voltage = 1, + charger_off = 0 +}; + +/* Magic number to write to ARM_SHIP_MODE register */ +#define LTC4162L_ARM_SHIP_MODE_MAGIC 21325 + + +struct ltc4162l_info { + struct i2c_client *client; + struct regmap *regmap; + struct power_supply *charger; + u32 rsnsb; /* Series resistor that sets charge current, mOhm */ + u32 rsnsi; /* Series resistor to measure input current, mOhm */ + u8 cell_count; /* Number of connected cells, 0 while unknown */ +}; + +static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info) +{ + int ret; + unsigned int val; + + /* Once read successfully */ + if (info->cell_count) + return info->cell_count; + + ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val); + if (ret) + return 0; + + /* Lower 4 bits is the cell count, or 0 if the chip doesn't know yet */ + val &= 0x0f; + if (!val) + return 0; + + /* Once determined, keep the value */ + info->cell_count = val; + + return val; +}; + +/* Convert enum value to POWER_SUPPLY_STATUS value */ +static int ltc4162l_state_decode(enum ltc4162l_state value) +{ + switch (value) { + case precharge: + case cc_cv_charge: + return POWER_SUPPLY_STATUS_CHARGING; + case c_over_x_term: + return POWER_SUPPLY_STATUS_FULL; + case bat_missing_fault: + case bat_short_fault: + return POWER_SUPPLY_STATUS_UNKNOWN; + default: + return POWER_SUPPLY_STATUS_NOT_CHARGING; + } +}; + +static int ltc4162l_get_status(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val); + if (ret) { + dev_err(&info->client->dev, "Failed to read CHARGER_STATE\n"); + return ret; + } + + val->intval = ltc4162l_state_decode(regval); + + return 0; +} + +static int ltc4162l_charge_status_decode(enum ltc4162l_charge_status value) +{ + if (!value) + return POWER_SUPPLY_CHARGE_TYPE_NONE; + + /* constant voltage/current and input_current limit are "fast" modes */ + if (value <= iin_limit_active) + return POWER_SUPPLY_CHARGE_TYPE_FAST; + + /* Anything that's not fast we'll return as trickle */ + return POWER_SUPPLY_CHARGE_TYPE_TRICKLE; +} + +static int ltc4162l_get_charge_type(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val); + if (ret) + return ret; + + val->intval = ltc4162l_charge_status_decode(regval); + + return 0; +} + +static int ltc4162l_state_to_health(enum ltc4162l_state value) +{ + switch (value) { + case ntc_pause: + return POWER_SUPPLY_HEALTH_OVERHEAT; + case timer_term: + return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; + case max_charge_time_fault: + return POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE; + case bat_missing_fault: + return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + case bat_short_fault: + return POWER_SUPPLY_HEALTH_DEAD; + default: + return POWER_SUPPLY_HEALTH_GOOD; + } +} + +static int ltc4162l_get_health(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val); + if (ret) + return ret; + + val->intval = ltc4162l_state_to_health(regval); + + return 0; +} + +static int ltc4162l_get_online(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_SYSTEM_STATUS_REG, ®val); + if (ret) + return ret; + + /* BIT(2) indicates if input voltage is sufficient to charge */ + val->intval = !!(regval & BIT(2)); + + return 0; +} + + +static int ltc4162l_get_vbat(struct ltc4162l_info *info, + unsigned int reg, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, reg, ®val); + if (ret) + return ret; + + /* cell_count × 192.4μV/LSB */ + regval *= 1924; + regval *= ltc4162l_get_cell_count(info); + regval /= 10; + val->intval = regval; + + return 0; +} + +static int ltc4162l_get_ibat(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_IBAT, ®val); + if (ret) + return ret; + + /* Signed 16-bit number, 1.466μV / RSNSB amperes/LSB. */ + val->intval = (int)((s16)(regval & 0xFFFF)) * 1466 / (int)info->rsnsb; + + return 0; +} + +static int ltc4162l_get_icharge(struct ltc4162l_info *info, + unsigned int reg, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, reg, ®val); + if (ret) + return ret; + + regval &= BIT(6) - 1; /* Only the lower 5 bits */ + + /* The charge current servo level: (icharge_dac + 1) × 1mV/RSNSB */ + val->intval = 1000000 * (regval + 1) / info->rsnsb; + + return 0; +} + +static int ltc4162l_set_icharge(struct ltc4162l_info *info, + unsigned int reg, + unsigned int value) +{ + value *= info->rsnsb; + value /= 1000000; + + /* Round to lowest possible */ + if (value) + --value; + + if (value > 31) + return -EINVAL; + + return regmap_write(info->regmap, reg, value); +} + + +static int ltc4162l_get_vcharge(struct ltc4162l_info *info, + unsigned int reg, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + u32 voltage; + + ret = regmap_read(info->regmap, reg, ®val); + if (ret) + return ret; + + regval &= BIT(6) - 1; /* Only the lower 5 bits */ + + /* + * charge voltage setting can be computed from + * cell_count × (vcharge_setting × 12.5mV + 3.8125V) + * where vcharge_setting ranges from 0 to 31 (4.2V max). + */ + voltage = 3812500 + (regval * 12500); + voltage *= ltc4162l_get_cell_count(info); + val->intval = voltage; + + return 0; +} + +static int ltc4162l_set_vcharge(struct ltc4162l_info *info, + unsigned int reg, + unsigned int value) +{ + u8 cell_count = ltc4162l_get_cell_count(info); + + if (!cell_count) + return -EBUSY; /* Not available yet, try again later */ + + value /= cell_count; + + if (value < 3812500) + return -EINVAL; + + value -= 3812500; + value /= 12500; + + if (value > 31) + return -EINVAL; + + return regmap_write(info->regmap, reg, value); +} + +static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_IIN_LIMIT_DAC, ®val); + if (ret) + return ret; + + /* (iin_limit_dac + 1) × 500μV / RSNSI */ + ++regval; + val->intval = (500000 * regval) / info->rsnsi; + + return 0; +} + +static int ltc4162l_set_iin_limit(struct ltc4162l_info *info, + unsigned int value) +{ + unsigned int regval; + + regval = value * info->rsnsi; + regval /= 500000; + if (regval) + --regval; + if (regval > 63) + regval = 63; + + return regmap_write(info->regmap, LTC4162L_IIN_LIMIT_TARGET, regval); +} + +static int ltc4162l_get_die_temp(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_DIE_TEMPERATURE, ®val); + if (ret) + return ret; + + /* die_temp × 0.0215°C/LSB - 264.4°C */ + ret = (s16)(regval & 0xFFFF); + ret *= 215; + ret /= 100; /* Centidegrees scale */ + ret -= 26440; + val->intval = ret; + + return 0; +} + +static int ltc4162l_get_term_current(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, ®val); + if (ret) + return ret; + + /* Check if C_OVER_X_THRESHOLD is enabled */ + if (!(regval & BIT(2))) { + val->intval = 0; + return 0; + } + + ret = regmap_read(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, ®val); + if (ret) + return ret; + + /* 1.466μV / RSNSB amperes/LSB */ + val->intval = (1466 * regval) / info->rsnsb; + + return 0; +} + +static int ltc4162l_set_term_current(struct ltc4162l_info *info, + unsigned int value) +{ + int ret; + unsigned int regval; + + if (!value) { + /* Disable en_c_over_x_term when set to zero */ + return regmap_update_bits(info->regmap, + LTC4162L_CHARGER_CONFIG_BITS, + BIT(2), 0); + } + + regval = DIV_ROUND_CLOSEST(value * info->rsnsb, 1466); + + ret = regmap_write(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, regval); + if (ret) + return ret; + + /* Set en_c_over_x_term after changing the threshold value */ + return regmap_update_bits(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, + BIT(2), BIT(2)); +} + +/* Custom properties */ +static const char * const ltc4162l_charge_status_name[] = { + "ilim_reg_active", /* 32 */ + "thermal_reg_active", + "vin_uvcl_active", + "iin_limit_active", + "constant_current", + "constant_voltage", + "charger_off" /* 0 */ +}; + +static ssize_t charge_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + const char *result = ltc4162l_charge_status_name[ + ARRAY_SIZE(ltc4162l_charge_status_name) - 1]; + unsigned int regval; + unsigned int mask; + unsigned int index; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val); + if (ret) + return ret; + + /* Only one bit is set according to datasheet, let's be safe here */ + for (mask = 32, index = 0; mask != 0; mask >>= 1, ++index) { + if (regval & mask) { + result = ltc4162l_charge_status_name[index]; + break; + } + } + + return sprintf(buf, "%s\n", result); +} +static DEVICE_ATTR_RO(charge_status); + +static ssize_t input_voltage_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_VIN, ®val); + if (ret) + return ret; + + /* 1.649mV/LSB */ + regval *= 1694; + + return sprintf(buf, "%u\n", regval); +} +static DEVICE_ATTR_RO(input_voltage); + +static ssize_t input_current_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_IIN, ®val); + if (ret) + return ret; + + /* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */ + ret = (int)((s16)(regval & 0xFFFF)) * 1466 / (int)info->rsnsi; + + return sprintf(buf, "%u\n", ret); +} +static DEVICE_ATTR_RO(input_current); + +static ssize_t force_telemetry_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_CONFIG_BITS_REG, ®val); + if (ret) + return ret; + + return sprintf(buf, "%u\n", regval & BIT(2) ? 1 : 0); +} + +static ssize_t force_telemetry_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + int ret; + unsigned int value; + + ret = kstrtouint(buf, 0, &value); + if (ret < 0) + return ret; + + ret = regmap_update_bits(info->regmap, LTC4162L_CONFIG_BITS_REG, + BIT(2), value ? BIT(2) : 0); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR_RW(force_telemetry); + +static ssize_t arm_ship_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_ARM_SHIP_MODE, ®val); + if (ret) + return ret; + + return sprintf(buf, "%u\n", + regval == LTC4162L_ARM_SHIP_MODE_MAGIC ? 1 : 0); +} + +static ssize_t arm_ship_mode_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) +{ + struct power_supply *psy = to_power_supply(dev); + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + int ret; + unsigned int value; + + ret = kstrtouint(buf, 0, &value); + if (ret < 0) + return ret; + + ret = regmap_write(info->regmap, LTC4162L_ARM_SHIP_MODE, + value ? LTC4162L_ARM_SHIP_MODE_MAGIC : 0); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR_RW(arm_ship_mode); + +static struct attribute *ltc4162l_sysfs_entries[] = { + &dev_attr_charge_status.attr, + &dev_attr_input_voltage.attr, + &dev_attr_input_current.attr, + &dev_attr_force_telemetry.attr, + &dev_attr_arm_ship_mode.attr, + NULL, +}; + +static struct attribute_group ltc4162l_attr_group = { + .name = NULL, /* put in device directory */ + .attrs = ltc4162l_sysfs_entries, +}; + +static int ltc4162l_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + return ltc4162l_get_status(info, val); + case POWER_SUPPLY_PROP_CHARGE_TYPE: + return ltc4162l_get_charge_type(info, val); + case POWER_SUPPLY_PROP_HEALTH: + return ltc4162l_get_health(info, val); + case POWER_SUPPLY_PROP_ONLINE: + return ltc4162l_get_online(info, val); + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + return ltc4162l_get_vbat(info, LTC4162L_VBAT, val); + case POWER_SUPPLY_PROP_VOLTAGE_AVG: + return ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, val); + case POWER_SUPPLY_PROP_CURRENT_NOW: + return ltc4162l_get_ibat(info, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + return ltc4162l_get_icharge(info, + LTC4162L_ICHARGE_DAC, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + return ltc4162l_get_icharge(info, + LTC4162L_CHARGE_CURRENT_SETTING, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: + return ltc4162l_get_vcharge(info, + LTC4162L_VCHARGE_DAC, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + return ltc4162l_get_vcharge(info, + LTC4162L_VCHARGE_SETTING, val); + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return ltc4162l_get_iin_limit_dac(info, val); + case POWER_SUPPLY_PROP_TEMP: + return ltc4162l_get_die_temp(info, val); + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + return ltc4162l_get_term_current(info, val); + default: + return -EINVAL; + } +} + +static int ltc4162l_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct ltc4162l_info *info = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + return ltc4162l_set_icharge(info, + LTC4162L_CHARGE_CURRENT_SETTING, val->intval); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + return ltc4162l_set_vcharge(info, + LTC4162L_VCHARGE_SETTING, val->intval); + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return ltc4162l_set_iin_limit(info, val->intval); + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + return ltc4162l_set_term_current(info, val->intval); + default: + return -EINVAL; + } +} + +static int ltc4162l_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + return 1; + default: + return 0; + } +} + +/* Charger power supply property routines */ +static enum power_supply_property ltc4162l_properties[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CHARGE_TYPE, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_VOLTAGE_NOW, /* Reports battery voltage */ + POWER_SUPPLY_PROP_VOLTAGE_AVG, + POWER_SUPPLY_PROP_CURRENT_NOW, /* Reports battery current */ + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, +}; + +static const struct power_supply_desc ltc4162l_desc = { + .name = "ltc4162-l", + .type = POWER_SUPPLY_TYPE_MAINS, + .properties = ltc4162l_properties, + .num_properties = ARRAY_SIZE(ltc4162l_properties), + .get_property = ltc4162l_get_property, + .set_property = ltc4162l_set_property, + .property_is_writeable = ltc4162l_property_is_writeable, +}; + +static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg) +{ + /* all registers up to this one are writeable */ + if (reg <= LTC4162L_CHARGER_CONFIG_BITS) + return true; + + /* The ALERTS registers can be written to clear alerts */ + if (reg >= LTC4162L_LIMIT_ALERTS_REG && + reg <= LTC4162L_CHARGE_STATUS_ALERTS_REG) + return true; + + return false; +} + +static bool ltc4162l_is_volatile_reg(struct device *dev, unsigned int reg) +{ + /* all registers after this one are read-only status registers */ + return reg > LTC4162L_CHARGER_CONFIG_BITS; +} + +static const struct regmap_config ltc4162l_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .writeable_reg = ltc4162l_is_writeable_reg, + .volatile_reg = ltc4162l_is_volatile_reg, + .max_register = LTC4162L_INPUT_UNDERVOLTAGE_DAC, + .cache_type = REGCACHE_RBTREE, +}; + +static int ltc4162l_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = client->adapter; + struct device *dev = &client->dev; + struct ltc4162l_info *info; + struct power_supply_config ltc4162l_config = {}; + int ret; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { + dev_err(dev, "No support for SMBUS_WORD_DATA\n"); + return -ENODEV; + } + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->client = client; + i2c_set_clientdata(client, info); + + info->regmap = devm_regmap_init_i2c(client, <c4162l_regmap_config); + if (IS_ERR(info->regmap)) { + dev_err(dev, "Failed to initialize register map\n"); + return PTR_ERR(info->regmap); + } + + ret = device_property_read_u32(dev, "lltc,rsnsb", &info->rsnsb); + if (ret) { + dev_err(dev, "Missing lltc,rsnsb property, assume 10 mOhm\n"); + info->rsnsb = 10; + } + ret = device_property_read_u32(dev, "lltc,rsnsi", &info->rsnsi); + if (ret) { + dev_err(dev, "Missing lltc,rsnsi property, assume 10 mOhm\n"); + info->rsnsi = 10; + } + + ltc4162l_config.of_node = dev->of_node; + ltc4162l_config.drv_data = info; + + info->charger = devm_power_supply_register(dev, <c4162l_desc, + <c4162l_config); + if (IS_ERR(info->charger)) { + dev_err(dev, "Failed to register charger\n"); + return PTR_ERR(info->charger); + } + + ret = sysfs_create_group(&info->charger->dev.kobj, + <c4162l_attr_group); + if (ret) + dev_err(dev, "failed to create extra sysfs entries\n"); + + return 0; +} + +static int ltc4162l_remove(struct i2c_client *client) +{ + struct ltc4162l_info *info = i2c_get_clientdata(client); + + sysfs_remove_group(&info->charger->dev.kobj, <c4162l_attr_group); + + return 0; +} + +static const struct i2c_device_id ltc4162l_i2c_id_table[] = { + { "ltc4162-l", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table); + +static const struct of_device_id ltc4162l_of_match[] = { + { .compatible = "lltc,ltc4162-l", }, + { }, +}; +MODULE_DEVICE_TABLE(of, ltc4162l_of_match); + +static struct i2c_driver ltc4162l_driver = { + .probe = ltc4162l_probe, + .remove = ltc4162l_remove, + .id_table = ltc4162l_i2c_id_table, + .driver = { + .name = "ltc4162-l-charger", + .of_match_table = of_match_ptr(ltc4162l_of_match), + }, +}; +module_i2c_driver(ltc4162l_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mike Looijmans "); +MODULE_DESCRIPTION("LTC4162-L charger driver");