power: supply: Add Spreadtrum SC27XX fuel gauge unit driver
This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support, which is used to calculate the battery capacity. Original-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Baolin Wang
Sebastian Reichel
parent
0d5f2e6e9c
commit
195ca17037
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@ -652,4 +652,11 @@ config CHARGER_SC2731
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Say Y here to enable support for battery charging with SC2731
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PMIC chips.
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config FUEL_GAUGE_SC27XX
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tristate "Spreadtrum SC27XX fuel gauge driver"
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depends on MFD_SC27XX_PMIC || COMPILE_TEST
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help
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Say Y here to enable support for fuel gauge with SC27XX
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PMIC chips.
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endif # POWER_SUPPLY
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@ -86,3 +86,4 @@ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
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obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
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obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o
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obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o
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obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o
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@ -0,0 +1,656 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Spreadtrum Communications Inc.
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#include <linux/gpio/consumer.h>
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#include <linux/iio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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/* PMIC global control registers definition */
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#define SC27XX_MODULE_EN0 0xc08
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#define SC27XX_CLK_EN0 0xc18
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#define SC27XX_FGU_EN BIT(7)
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#define SC27XX_FGU_RTC_EN BIT(6)
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/* FGU registers definition */
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#define SC27XX_FGU_START 0x0
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#define SC27XX_FGU_CONFIG 0x4
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#define SC27XX_FGU_ADC_CONFIG 0x8
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#define SC27XX_FGU_STATUS 0xc
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#define SC27XX_FGU_INT_EN 0x10
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#define SC27XX_FGU_INT_CLR 0x14
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#define SC27XX_FGU_INT_STS 0x1c
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#define SC27XX_FGU_VOLTAGE 0x20
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#define SC27XX_FGU_OCV 0x24
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#define SC27XX_FGU_POCV 0x28
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#define SC27XX_FGU_CURRENT 0x2c
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#define SC27XX_FGU_CLBCNT_SETH 0x50
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#define SC27XX_FGU_CLBCNT_SETL 0x54
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#define SC27XX_FGU_CLBCNT_VALH 0x68
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#define SC27XX_FGU_CLBCNT_VALL 0x6c
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#define SC27XX_FGU_CLBCNT_QMAXL 0x74
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#define SC27XX_WRITE_SELCLB_EN BIT(0)
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#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0)
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#define SC27XX_FGU_CLBCNT_SHIFT 16
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#define SC27XX_FGU_1000MV_ADC 686
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#define SC27XX_FGU_1000MA_ADC 1372
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#define SC27XX_FGU_CUR_BASIC_ADC 8192
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#define SC27XX_FGU_SAMPLE_HZ 2
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/*
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* struct sc27xx_fgu_data: describe the FGU device
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* @regmap: regmap for register access
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* @dev: platform device
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* @battery: battery power supply
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* @base: the base offset for the controller
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* @lock: protect the structure
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* @gpiod: GPIO for battery detection
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* @channel: IIO channel to get battery temperature
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* @internal_resist: the battery internal resistance in mOhm
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* @total_cap: the total capacity of the battery in mAh
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* @init_cap: the initial capacity of the battery in mAh
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* @init_clbcnt: the initial coulomb counter
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* @max_volt: the maximum constant input voltage in millivolt
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* @table_len: the capacity table length
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* @cap_table: capacity table with corresponding ocv
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*/
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struct sc27xx_fgu_data {
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struct regmap *regmap;
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struct device *dev;
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struct power_supply *battery;
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u32 base;
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struct mutex lock;
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struct gpio_desc *gpiod;
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struct iio_channel *channel;
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bool bat_present;
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int internal_resist;
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int total_cap;
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int init_cap;
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int init_clbcnt;
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int max_volt;
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int table_len;
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struct power_supply_battery_ocv_table *cap_table;
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};
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static const char * const sc27xx_charger_supply_name[] = {
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"sc2731_charger",
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"sc2720_charger",
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"sc2721_charger",
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"sc2723_charger",
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};
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static int sc27xx_fgu_adc_to_current(int adc)
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{
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return DIV_ROUND_CLOSEST(adc * 1000, SC27XX_FGU_1000MA_ADC);
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}
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static int sc27xx_fgu_adc_to_voltage(int adc)
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{
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return DIV_ROUND_CLOSEST(adc * 1000, SC27XX_FGU_1000MV_ADC);
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}
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/*
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* When system boots on, we can not read battery capacity from coulomb
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* registers, since now the coulomb registers are invalid. So we should
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* calculate the battery open circuit voltage, and get current battery
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* capacity according to the capacity table.
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*/
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static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap)
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{
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int volt, cur, oci, ocv, ret;
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/*
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* After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved
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* the first sampled open circuit current.
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*/
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ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL,
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&cur);
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if (ret)
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return ret;
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cur <<= 1;
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oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC);
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/*
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* Should get the OCV from SC27XX_FGU_POCV register at the system
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* beginning. It is ADC values reading from registers which need to
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* convert the corresponding voltage.
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*/
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ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt);
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if (ret)
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return ret;
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volt = sc27xx_fgu_adc_to_voltage(volt);
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ocv = volt * 1000 - oci * data->internal_resist;
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/*
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* Parse the capacity table to look up the correct capacity percent
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* according to current battery's corresponding OCV values.
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*/
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*cap = power_supply_ocv2cap_simple(data->cap_table, data->table_len,
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ocv);
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return 0;
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}
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static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt)
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{
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int ret;
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clbcnt *= SC27XX_FGU_SAMPLE_HZ;
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ret = regmap_update_bits(data->regmap,
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data->base + SC27XX_FGU_CLBCNT_SETL,
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SC27XX_FGU_CLBCNT_MASK, clbcnt);
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if (ret)
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return ret;
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ret = regmap_update_bits(data->regmap,
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data->base + SC27XX_FGU_CLBCNT_SETH,
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SC27XX_FGU_CLBCNT_MASK,
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clbcnt >> SC27XX_FGU_CLBCNT_SHIFT);
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if (ret)
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return ret;
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return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START,
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SC27XX_WRITE_SELCLB_EN,
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SC27XX_WRITE_SELCLB_EN);
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}
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static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt)
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{
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int ccl, cch, ret;
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ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL,
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&ccl);
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if (ret)
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return ret;
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ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH,
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&cch);
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if (ret)
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return ret;
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*clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK;
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*clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT;
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*clb_cnt /= SC27XX_FGU_SAMPLE_HZ;
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return 0;
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}
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static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap)
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{
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int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp;
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/* Get current coulomb counters firstly */
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ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt);
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if (ret)
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return ret;
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delta_clbcnt = cur_clbcnt - data->init_clbcnt;
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/*
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* Convert coulomb counter to delta capacity (mAh), and set multiplier
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* as 100 to improve the precision.
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*/
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temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360);
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temp = sc27xx_fgu_adc_to_current(temp);
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/*
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* Convert to capacity percent of the battery total capacity,
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* and multiplier is 100 too.
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*/
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delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap);
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*cap = delta_cap + data->init_cap;
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return 0;
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}
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static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val)
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{
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int ret, vol;
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ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol);
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if (ret)
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return ret;
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/*
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* It is ADC values reading from registers which need to convert to
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* corresponding voltage values.
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*/
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*val = sc27xx_fgu_adc_to_voltage(vol);
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return 0;
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}
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static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val)
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{
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int ret, cur;
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ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur);
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if (ret)
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return ret;
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/*
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* It is ADC values reading from registers which need to convert to
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* corresponding current values.
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*/
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*val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC);
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return 0;
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}
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static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val)
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{
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int vol, cur, ret;
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ret = sc27xx_fgu_get_vbat_vol(data, &vol);
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if (ret)
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return ret;
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ret = sc27xx_fgu_get_current(data, &cur);
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if (ret)
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return ret;
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/* Return the battery OCV in micro volts. */
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*val = vol * 1000 - cur * data->internal_resist;
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return 0;
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}
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static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp)
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{
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return iio_read_channel_processed(data->channel, temp);
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}
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static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health)
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{
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int ret, vol;
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ret = sc27xx_fgu_get_vbat_vol(data, &vol);
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if (ret)
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return ret;
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if (vol > data->max_volt)
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*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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else
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*health = POWER_SUPPLY_HEALTH_GOOD;
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return 0;
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}
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static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status)
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{
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union power_supply_propval val;
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struct power_supply *psy;
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int i, ret = -EINVAL;
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for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) {
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psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]);
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if (!psy)
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continue;
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ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
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&val);
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power_supply_put(psy);
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if (ret)
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return ret;
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*status = val.intval;
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}
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return ret;
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}
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static int sc27xx_fgu_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
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int ret = 0;
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int value;
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mutex_lock(&data->lock);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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ret = sc27xx_fgu_get_status(data, &value);
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if (ret)
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goto error;
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val->intval = value;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = sc27xx_fgu_get_health(data, &value);
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if (ret)
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goto error;
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val->intval = value;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = data->bat_present;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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ret = sc27xx_fgu_get_temp(data, &value);
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if (ret)
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goto error;
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val->intval = value;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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ret = sc27xx_fgu_get_capacity(data, &value);
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if (ret)
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goto error;
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val->intval = value;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = sc27xx_fgu_get_vbat_vol(data, &value);
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if (ret)
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goto error;
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val->intval = value * 1000;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_OCV:
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ret = sc27xx_fgu_get_vbat_ocv(data, &value);
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if (ret)
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goto error;
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val->intval = value;
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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case POWER_SUPPLY_PROP_CURRENT_AVG:
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ret = sc27xx_fgu_get_current(data, &value);
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if (ret)
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goto error;
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val->intval = value * 1000;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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error:
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mutex_unlock(&data->lock);
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return ret;
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}
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static void sc27xx_fgu_external_power_changed(struct power_supply *psy)
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{
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struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
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power_supply_changed(data->battery);
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}
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static enum power_supply_property sc27xx_fgu_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_OCV,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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};
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static const struct power_supply_desc sc27xx_fgu_desc = {
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.name = "sc27xx-fgu",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = sc27xx_fgu_props,
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.num_properties = ARRAY_SIZE(sc27xx_fgu_props),
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.get_property = sc27xx_fgu_get_property,
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.external_power_changed = sc27xx_fgu_external_power_changed,
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};
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static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id)
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{
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struct sc27xx_fgu_data *data = dev_id;
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int state;
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mutex_lock(&data->lock);
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state = gpiod_get_value_cansleep(data->gpiod);
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if (state < 0) {
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dev_err(data->dev, "failed to get gpio state\n");
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mutex_unlock(&data->lock);
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return IRQ_RETVAL(state);
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}
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|
||||
data->bat_present = !!state;
|
||||
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
power_supply_changed(data->battery);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static void sc27xx_fgu_disable(void *_data)
|
||||
{
|
||||
struct sc27xx_fgu_data *data = _data;
|
||||
|
||||
regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0);
|
||||
regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0);
|
||||
}
|
||||
|
||||
static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity)
|
||||
{
|
||||
/*
|
||||
* Get current capacity (mAh) = battery total capacity (mAh) *
|
||||
* current capacity percent (capacity / 100).
|
||||
*/
|
||||
int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100);
|
||||
|
||||
/*
|
||||
* Convert current capacity (mAh) to coulomb counter according to the
|
||||
* formula: 1 mAh =3.6 coulomb.
|
||||
*/
|
||||
return DIV_ROUND_CLOSEST(cur_cap * 36, 10);
|
||||
}
|
||||
|
||||
static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
|
||||
{
|
||||
struct power_supply_battery_info info = { };
|
||||
struct power_supply_battery_ocv_table *table;
|
||||
int ret;
|
||||
|
||||
ret = power_supply_get_battery_info(data->battery, &info);
|
||||
if (ret) {
|
||||
dev_err(data->dev, "failed to get battery information\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->total_cap = info.charge_full_design_uah / 1000;
|
||||
data->max_volt = info.constant_charge_voltage_max_uv / 1000;
|
||||
data->internal_resist = info.factory_internal_resistance_uohm / 1000;
|
||||
|
||||
/*
|
||||
* For SC27XX fuel gauge device, we only use one ocv-capacity
|
||||
* table in normal temperature 20 Celsius.
|
||||
*/
|
||||
table = power_supply_find_ocv2cap_table(&info, 20, &data->table_len);
|
||||
if (!table)
|
||||
return -EINVAL;
|
||||
|
||||
data->cap_table = devm_kmemdup(data->dev, table,
|
||||
data->table_len * sizeof(*table),
|
||||
GFP_KERNEL);
|
||||
if (!data->cap_table) {
|
||||
power_supply_put_battery_info(data->battery, &info);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
power_supply_put_battery_info(data->battery, &info);
|
||||
|
||||
/* Enable the FGU module */
|
||||
ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0,
|
||||
SC27XX_FGU_EN, SC27XX_FGU_EN);
|
||||
if (ret) {
|
||||
dev_err(data->dev, "failed to enable fgu\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Enable the FGU RTC clock to make it work */
|
||||
ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0,
|
||||
SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN);
|
||||
if (ret) {
|
||||
dev_err(data->dev, "failed to enable fgu RTC clock\n");
|
||||
goto disable_fgu;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get the boot battery capacity when system powers on, which is used to
|
||||
* initialize the coulomb counter. After that, we can read the coulomb
|
||||
* counter to measure the battery capacity.
|
||||
*/
|
||||
ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap);
|
||||
if (ret) {
|
||||
dev_err(data->dev, "failed to get boot capacity\n");
|
||||
goto disable_clk;
|
||||
}
|
||||
|
||||
/*
|
||||
* Convert battery capacity to the corresponding initial coulomb counter
|
||||
* and set into coulomb counter registers.
|
||||
*/
|
||||
data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap);
|
||||
ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt);
|
||||
if (ret) {
|
||||
dev_err(data->dev, "failed to initialize coulomb counter\n");
|
||||
goto disable_clk;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
disable_clk:
|
||||
regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0);
|
||||
disable_fgu:
|
||||
regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sc27xx_fgu_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device_node *np = pdev->dev.of_node;
|
||||
struct power_supply_config fgu_cfg = { };
|
||||
struct sc27xx_fgu_data *data;
|
||||
int ret, irq;
|
||||
|
||||
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
data->regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
||||
if (!data->regmap) {
|
||||
dev_err(&pdev->dev, "failed to get regmap\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
ret = device_property_read_u32(&pdev->dev, "reg", &data->base);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to get fgu address\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->channel = devm_iio_channel_get(&pdev->dev, "bat-temp");
|
||||
if (IS_ERR(data->channel)) {
|
||||
dev_err(&pdev->dev, "failed to get IIO channel\n");
|
||||
return PTR_ERR(data->channel);
|
||||
}
|
||||
|
||||
data->gpiod = devm_gpiod_get(&pdev->dev, "bat-detect", GPIOD_IN);
|
||||
if (IS_ERR(data->gpiod)) {
|
||||
dev_err(&pdev->dev, "failed to get battery detection GPIO\n");
|
||||
return PTR_ERR(data->gpiod);
|
||||
}
|
||||
|
||||
ret = gpiod_get_value_cansleep(data->gpiod);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to get gpio state\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->bat_present = !!ret;
|
||||
mutex_init(&data->lock);
|
||||
data->dev = &pdev->dev;
|
||||
|
||||
fgu_cfg.drv_data = data;
|
||||
fgu_cfg.of_node = np;
|
||||
data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc,
|
||||
&fgu_cfg);
|
||||
if (IS_ERR(data->battery)) {
|
||||
dev_err(&pdev->dev, "failed to register power supply\n");
|
||||
return PTR_ERR(data->battery);
|
||||
}
|
||||
|
||||
ret = sc27xx_fgu_hw_init(data);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to initialize fgu hardware\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data);
|
||||
if (ret) {
|
||||
sc27xx_fgu_disable(data);
|
||||
dev_err(&pdev->dev, "failed to add fgu disable action\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
irq = gpiod_to_irq(data->gpiod);
|
||||
if (irq < 0) {
|
||||
dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n");
|
||||
return irq;
|
||||
}
|
||||
|
||||
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
|
||||
sc27xx_fgu_bat_detection,
|
||||
IRQF_ONESHOT | IRQF_TRIGGER_RISING |
|
||||
IRQF_TRIGGER_FALLING,
|
||||
pdev->name, data);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to request IRQ\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id sc27xx_fgu_of_match[] = {
|
||||
{ .compatible = "sprd,sc2731-fgu", },
|
||||
{ }
|
||||
};
|
||||
|
||||
static struct platform_driver sc27xx_fgu_driver = {
|
||||
.probe = sc27xx_fgu_probe,
|
||||
.driver = {
|
||||
.name = "sc27xx-fgu",
|
||||
.of_match_table = sc27xx_fgu_of_match,
|
||||
}
|
||||
};
|
||||
|
||||
module_platform_driver(sc27xx_fgu_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue