| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Battery driver for Marvell 88PM860x PMIC |
| * |
| * Copyright (c) 2012 Marvell International Ltd. |
| * Author: Jett Zhou <jtzhou@marvell.com> |
| * Haojian Zhuang <haojian.zhuang@marvell.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include <linux/string.h> |
| #include <linux/power_supply.h> |
| #include <linux/mfd/88pm860x.h> |
| #include <linux/delay.h> |
| |
| /* bit definitions of Status Query Interface 2 */ |
| #define STATUS2_CHG (1 << 2) |
| #define STATUS2_BAT (1 << 3) |
| #define STATUS2_VBUS (1 << 4) |
| |
| /* bit definitions of Measurement Enable 1 Register */ |
| #define MEAS1_TINT (1 << 3) |
| #define MEAS1_GP1 (1 << 5) |
| |
| /* bit definitions of Measurement Enable 3 Register */ |
| #define MEAS3_IBAT (1 << 0) |
| #define MEAS3_BAT_DET (1 << 1) |
| #define MEAS3_CC (1 << 2) |
| |
| /* bit definitions of Measurement Off Time Register */ |
| #define MEAS_OFF_SLEEP_EN (1 << 1) |
| |
| /* bit definitions of GPADC Bias Current 2 Register */ |
| #define GPBIAS2_GPADC1_SET (2 << 4) |
| /* GPADC1 Bias Current value in uA unit */ |
| #define GPBIAS2_GPADC1_UA ((GPBIAS2_GPADC1_SET >> 4) * 5 + 1) |
| |
| /* bit definitions of GPADC Misc 1 Register */ |
| #define GPMISC1_GPADC_EN (1 << 0) |
| |
| /* bit definitions of Charger Control 6 Register */ |
| #define CC6_BAT_DET_GPADC1 1 |
| |
| /* bit definitions of Coulomb Counter Reading Register */ |
| #define CCNT_AVG_SEL (4 << 3) |
| |
| /* bit definitions of RTC miscellaneous Register1 */ |
| #define RTC_SOC_5LSB (0x1F << 3) |
| |
| /* bit definitions of RTC Register1 */ |
| #define RTC_SOC_3MSB (0x7) |
| |
| /* bit definitions of Power up Log register */ |
| #define BAT_WU_LOG (1<<6) |
| |
| /* coulomb counter index */ |
| #define CCNT_POS1 0 |
| #define CCNT_POS2 1 |
| #define CCNT_NEG1 2 |
| #define CCNT_NEG2 3 |
| #define CCNT_SPOS 4 |
| #define CCNT_SNEG 5 |
| |
| /* OCV -- Open Circuit Voltage */ |
| #define OCV_MODE_ACTIVE 0 |
| #define OCV_MODE_SLEEP 1 |
| |
| /* Vbat range of CC for measuring Rbat */ |
| #define LOW_BAT_THRESHOLD 3600 |
| #define VBATT_RESISTOR_MIN 3800 |
| #define VBATT_RESISTOR_MAX 4100 |
| |
| /* TBAT for batt, TINT for chip itself */ |
| #define PM860X_TEMP_TINT (0) |
| #define PM860X_TEMP_TBAT (1) |
| |
| /* |
| * Battery temperature based on NTC resistor, defined |
| * corresponding resistor value -- Ohm / C degeree. |
| */ |
| #define TBAT_NEG_25D 127773 /* -25 */ |
| #define TBAT_NEG_10D 54564 /* -10 */ |
| #define TBAT_0D 32330 /* 0 */ |
| #define TBAT_10D 19785 /* 10 */ |
| #define TBAT_20D 12468 /* 20 */ |
| #define TBAT_30D 8072 /* 30 */ |
| #define TBAT_40D 5356 /* 40 */ |
| |
| struct pm860x_battery_info { |
| struct pm860x_chip *chip; |
| struct i2c_client *i2c; |
| struct device *dev; |
| |
| struct power_supply *battery; |
| struct mutex lock; |
| int status; |
| int irq_cc; |
| int irq_batt; |
| int max_capacity; |
| int resistor; /* Battery Internal Resistor */ |
| int last_capacity; |
| int start_soc; |
| unsigned present:1; |
| unsigned temp_type:1; /* TINT or TBAT */ |
| }; |
| |
| struct ccnt { |
| unsigned long long int pos; |
| unsigned long long int neg; |
| unsigned int spos; |
| unsigned int sneg; |
| |
| int total_chg; /* mAh(3.6C) */ |
| int total_dischg; /* mAh(3.6C) */ |
| }; |
| |
| /* |
| * State of Charge. |
| * The first number is mAh(=3.6C), and the second number is percent point. |
| */ |
| static int array_soc[][2] = { |
| {4170, 100}, {4154, 99}, {4136, 98}, {4122, 97}, {4107, 96}, |
| {4102, 95}, {4088, 94}, {4081, 93}, {4070, 92}, {4060, 91}, |
| {4053, 90}, {4044, 89}, {4035, 88}, {4028, 87}, {4019, 86}, |
| {4013, 85}, {4006, 84}, {3995, 83}, {3987, 82}, {3982, 81}, |
| {3976, 80}, {3968, 79}, {3962, 78}, {3954, 77}, {3946, 76}, |
| {3941, 75}, {3934, 74}, {3929, 73}, {3922, 72}, {3916, 71}, |
| {3910, 70}, {3904, 69}, {3898, 68}, {3892, 67}, {3887, 66}, |
| {3880, 65}, {3874, 64}, {3868, 63}, {3862, 62}, {3854, 61}, |
| {3849, 60}, {3843, 59}, {3840, 58}, {3833, 57}, {3829, 56}, |
| {3824, 55}, {3818, 54}, {3815, 53}, {3810, 52}, {3808, 51}, |
| {3804, 50}, {3801, 49}, {3798, 48}, {3796, 47}, {3792, 46}, |
| {3789, 45}, {3785, 44}, {3784, 43}, {3782, 42}, {3780, 41}, |
| {3777, 40}, {3776, 39}, {3774, 38}, {3772, 37}, {3771, 36}, |
| {3769, 35}, {3768, 34}, {3764, 33}, {3763, 32}, {3760, 31}, |
| {3760, 30}, {3754, 29}, {3750, 28}, {3749, 27}, {3744, 26}, |
| {3740, 25}, {3734, 24}, {3732, 23}, {3728, 22}, {3726, 21}, |
| {3720, 20}, {3716, 19}, {3709, 18}, {3703, 17}, {3698, 16}, |
| {3692, 15}, {3683, 14}, {3675, 13}, {3670, 12}, {3665, 11}, |
| {3661, 10}, {3649, 9}, {3637, 8}, {3622, 7}, {3609, 6}, |
| {3580, 5}, {3558, 4}, {3540, 3}, {3510, 2}, {3429, 1}, |
| }; |
| |
| static struct ccnt ccnt_data; |
| |
| /* |
| * register 1 bit[7:0] -- bit[11:4] of measured value of voltage |
| * register 0 bit[3:0] -- bit[3:0] of measured value of voltage |
| */ |
| static int measure_12bit_voltage(struct pm860x_battery_info *info, |
| int offset, int *data) |
| { |
| unsigned char buf[2]; |
| int ret; |
| |
| ret = pm860x_bulk_read(info->i2c, offset, 2, buf); |
| if (ret < 0) |
| return ret; |
| |
| *data = ((buf[0] & 0xff) << 4) | (buf[1] & 0x0f); |
| /* V_MEAS(mV) = data * 1.8 * 1000 / (2^12) */ |
| *data = ((*data & 0xfff) * 9 * 25) >> 9; |
| return 0; |
| } |
| |
| static int measure_vbatt(struct pm860x_battery_info *info, int state, |
| int *data) |
| { |
| unsigned char buf[5]; |
| int ret; |
| |
| switch (state) { |
| case OCV_MODE_ACTIVE: |
| ret = measure_12bit_voltage(info, PM8607_VBAT_MEAS1, data); |
| if (ret) |
| return ret; |
| /* V_BATT_MEAS(mV) = value * 3 * 1.8 * 1000 / (2^12) */ |
| *data *= 3; |
| break; |
| case OCV_MODE_SLEEP: |
| /* |
| * voltage value of VBATT in sleep mode is saved in different |
| * registers. |
| * bit[11:10] -- bit[7:6] of LDO9(0x18) |
| * bit[9:8] -- bit[7:6] of LDO8(0x17) |
| * bit[7:6] -- bit[7:6] of LDO7(0x16) |
| * bit[5:4] -- bit[7:6] of LDO6(0x15) |
| * bit[3:0] -- bit[7:4] of LDO5(0x14) |
| */ |
| ret = pm860x_bulk_read(info->i2c, PM8607_LDO5, 5, buf); |
| if (ret < 0) |
| return ret; |
| ret = ((buf[4] >> 6) << 10) | ((buf[3] >> 6) << 8) |
| | ((buf[2] >> 6) << 6) | ((buf[1] >> 6) << 4) |
| | (buf[0] >> 4); |
| /* V_BATT_MEAS(mV) = data * 3 * 1.8 * 1000 / (2^12) */ |
| *data = ((*data & 0xff) * 27 * 25) >> 9; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| /* |
| * Return value is signed data. |
| * Negative value means discharging, and positive value means charging. |
| */ |
| static int measure_current(struct pm860x_battery_info *info, int *data) |
| { |
| unsigned char buf[2]; |
| short s; |
| int ret; |
| |
| ret = pm860x_bulk_read(info->i2c, PM8607_IBAT_MEAS1, 2, buf); |
| if (ret < 0) |
| return ret; |
| |
| s = ((buf[0] & 0xff) << 8) | (buf[1] & 0xff); |
| /* current(mA) = value * 0.125 */ |
| *data = s >> 3; |
| return 0; |
| } |
| |
| static int set_charger_current(struct pm860x_battery_info *info, int data, |
| int *old) |
| { |
| int ret; |
| |
| if (data < 50 || data > 1600 || !old) |
| return -EINVAL; |
| |
| data = ((data - 50) / 50) & 0x1f; |
| *old = pm860x_reg_read(info->i2c, PM8607_CHG_CTRL2); |
| *old = (*old & 0x1f) * 50 + 50; |
| ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL2, 0x1f, data); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| |
| static int read_ccnt(struct pm860x_battery_info *info, int offset, |
| int *ccnt) |
| { |
| unsigned char buf[2]; |
| int ret; |
| |
| ret = pm860x_set_bits(info->i2c, PM8607_CCNT, 7, offset & 7); |
| if (ret < 0) |
| goto out; |
| ret = pm860x_bulk_read(info->i2c, PM8607_CCNT_MEAS1, 2, buf); |
| if (ret < 0) |
| goto out; |
| *ccnt = ((buf[0] & 0xff) << 8) | (buf[1] & 0xff); |
| return 0; |
| out: |
| return ret; |
| } |
| |
| static int calc_ccnt(struct pm860x_battery_info *info, struct ccnt *ccnt) |
| { |
| unsigned int sum; |
| int ret; |
| int data; |
| |
| ret = read_ccnt(info, CCNT_POS1, &data); |
| if (ret) |
| goto out; |
| sum = data & 0xffff; |
| ret = read_ccnt(info, CCNT_POS2, &data); |
| if (ret) |
| goto out; |
| sum |= (data & 0xffff) << 16; |
| ccnt->pos += sum; |
| |
| ret = read_ccnt(info, CCNT_NEG1, &data); |
| if (ret) |
| goto out; |
| sum = data & 0xffff; |
| ret = read_ccnt(info, CCNT_NEG2, &data); |
| if (ret) |
| goto out; |
| sum |= (data & 0xffff) << 16; |
| sum = ~sum + 1; /* since it's negative */ |
| ccnt->neg += sum; |
| |
| ret = read_ccnt(info, CCNT_SPOS, &data); |
| if (ret) |
| goto out; |
| ccnt->spos += data; |
| ret = read_ccnt(info, CCNT_SNEG, &data); |
| if (ret) |
| goto out; |
| |
| /* |
| * charge(mAh) = count * 1.6984 * 1e(-8) |
| * = count * 16984 * 1.024 * 1.024 * 1.024 / (2 ^ 40) |
| * = count * 18236 / (2 ^ 40) |
| */ |
| ccnt->total_chg = (int) ((ccnt->pos * 18236) >> 40); |
| ccnt->total_dischg = (int) ((ccnt->neg * 18236) >> 40); |
| return 0; |
| out: |
| return ret; |
| } |
| |
| static int clear_ccnt(struct pm860x_battery_info *info, struct ccnt *ccnt) |
| { |
| int data; |
| |
| memset(ccnt, 0, sizeof(*ccnt)); |
| /* read to clear ccnt */ |
| read_ccnt(info, CCNT_POS1, &data); |
| read_ccnt(info, CCNT_POS2, &data); |
| read_ccnt(info, CCNT_NEG1, &data); |
| read_ccnt(info, CCNT_NEG2, &data); |
| read_ccnt(info, CCNT_SPOS, &data); |
| read_ccnt(info, CCNT_SNEG, &data); |
| return 0; |
| } |
| |
| /* Calculate Open Circuit Voltage */ |
| static int calc_ocv(struct pm860x_battery_info *info, int *ocv) |
| { |
| int ret; |
| int i; |
| int data; |
| int vbatt_avg; |
| int vbatt_sum; |
| int ibatt_avg; |
| int ibatt_sum; |
| |
| if (!ocv) |
| return -EINVAL; |
| |
| for (i = 0, ibatt_sum = 0, vbatt_sum = 0; i < 10; i++) { |
| ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data); |
| if (ret) |
| goto out; |
| vbatt_sum += data; |
| ret = measure_current(info, &data); |
| if (ret) |
| goto out; |
| ibatt_sum += data; |
| } |
| vbatt_avg = vbatt_sum / 10; |
| ibatt_avg = ibatt_sum / 10; |
| |
| mutex_lock(&info->lock); |
| if (info->present) |
| *ocv = vbatt_avg - ibatt_avg * info->resistor / 1000; |
| else |
| *ocv = vbatt_avg; |
| mutex_unlock(&info->lock); |
| dev_dbg(info->dev, "VBAT average:%d, OCV:%d\n", vbatt_avg, *ocv); |
| return 0; |
| out: |
| return ret; |
| } |
| |
| /* Calculate State of Charge (percent points) */ |
| static int calc_soc(struct pm860x_battery_info *info, int state, int *soc) |
| { |
| int i; |
| int ocv; |
| int count; |
| int ret = -EINVAL; |
| |
| if (!soc) |
| return -EINVAL; |
| |
| switch (state) { |
| case OCV_MODE_ACTIVE: |
| ret = calc_ocv(info, &ocv); |
| break; |
| case OCV_MODE_SLEEP: |
| ret = measure_vbatt(info, OCV_MODE_SLEEP, &ocv); |
| break; |
| } |
| if (ret) |
| return ret; |
| |
| count = ARRAY_SIZE(array_soc); |
| if (ocv < array_soc[count - 1][0]) { |
| *soc = 0; |
| return 0; |
| } |
| |
| for (i = 0; i < count; i++) { |
| if (ocv >= array_soc[i][0]) { |
| *soc = array_soc[i][1]; |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| static irqreturn_t pm860x_coulomb_handler(int irq, void *data) |
| { |
| struct pm860x_battery_info *info = data; |
| |
| calc_ccnt(info, &ccnt_data); |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t pm860x_batt_handler(int irq, void *data) |
| { |
| struct pm860x_battery_info *info = data; |
| int ret; |
| |
| mutex_lock(&info->lock); |
| ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2); |
| if (ret & STATUS2_BAT) { |
| info->present = 1; |
| info->temp_type = PM860X_TEMP_TBAT; |
| } else { |
| info->present = 0; |
| info->temp_type = PM860X_TEMP_TINT; |
| } |
| mutex_unlock(&info->lock); |
| /* clear ccnt since battery is attached or dettached */ |
| clear_ccnt(info, &ccnt_data); |
| return IRQ_HANDLED; |
| } |
| |
| static void pm860x_init_battery(struct pm860x_battery_info *info) |
| { |
| unsigned char buf[2]; |
| int ret; |
| int data; |
| int bat_remove; |
| int soc; |
| |
| /* measure enable on GPADC1 */ |
| data = MEAS1_GP1; |
| if (info->temp_type == PM860X_TEMP_TINT) |
| data |= MEAS1_TINT; |
| ret = pm860x_set_bits(info->i2c, PM8607_MEAS_EN1, data, data); |
| if (ret) |
| goto out; |
| |
| /* measure enable on IBAT, BAT_DET, CC. IBAT is depend on CC. */ |
| data = MEAS3_IBAT | MEAS3_BAT_DET | MEAS3_CC; |
| ret = pm860x_set_bits(info->i2c, PM8607_MEAS_EN3, data, data); |
| if (ret) |
| goto out; |
| |
| /* measure disable CC in sleep time */ |
| ret = pm860x_reg_write(info->i2c, PM8607_MEAS_OFF_TIME1, 0x82); |
| if (ret) |
| goto out; |
| ret = pm860x_reg_write(info->i2c, PM8607_MEAS_OFF_TIME2, 0x6c); |
| if (ret) |
| goto out; |
| |
| /* enable GPADC */ |
| ret = pm860x_set_bits(info->i2c, PM8607_GPADC_MISC1, |
| GPMISC1_GPADC_EN, GPMISC1_GPADC_EN); |
| if (ret < 0) |
| goto out; |
| |
| /* detect battery via GPADC1 */ |
| ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL6, |
| CC6_BAT_DET_GPADC1, CC6_BAT_DET_GPADC1); |
| if (ret < 0) |
| goto out; |
| |
| ret = pm860x_set_bits(info->i2c, PM8607_CCNT, 7 << 3, |
| CCNT_AVG_SEL); |
| if (ret < 0) |
| goto out; |
| |
| /* set GPADC1 bias */ |
| ret = pm860x_set_bits(info->i2c, PM8607_GP_BIAS2, 0xF << 4, |
| GPBIAS2_GPADC1_SET); |
| if (ret < 0) |
| goto out; |
| |
| /* check whether battery present) */ |
| mutex_lock(&info->lock); |
| ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2); |
| if (ret < 0) { |
| mutex_unlock(&info->lock); |
| goto out; |
| } |
| if (ret & STATUS2_BAT) { |
| info->present = 1; |
| info->temp_type = PM860X_TEMP_TBAT; |
| } else { |
| info->present = 0; |
| info->temp_type = PM860X_TEMP_TINT; |
| } |
| mutex_unlock(&info->lock); |
| |
| calc_soc(info, OCV_MODE_ACTIVE, &soc); |
| |
| data = pm860x_reg_read(info->i2c, PM8607_POWER_UP_LOG); |
| bat_remove = data & BAT_WU_LOG; |
| |
| dev_dbg(info->dev, "battery wake up? %s\n", |
| bat_remove != 0 ? "yes" : "no"); |
| |
| /* restore SOC from RTC domain register */ |
| if (bat_remove == 0) { |
| buf[0] = pm860x_reg_read(info->i2c, PM8607_RTC_MISC2); |
| buf[1] = pm860x_reg_read(info->i2c, PM8607_RTC1); |
| data = ((buf[1] & 0x3) << 5) | ((buf[0] >> 3) & 0x1F); |
| if (data > soc + 15) |
| info->start_soc = soc; |
| else if (data < soc - 15) |
| info->start_soc = soc; |
| else |
| info->start_soc = data; |
| dev_dbg(info->dev, "soc_rtc %d, soc_ocv :%d\n", data, soc); |
| } else { |
| pm860x_set_bits(info->i2c, PM8607_POWER_UP_LOG, |
| BAT_WU_LOG, BAT_WU_LOG); |
| info->start_soc = soc; |
| } |
| info->last_capacity = info->start_soc; |
| dev_dbg(info->dev, "init soc : %d\n", info->last_capacity); |
| out: |
| return; |
| } |
| |
| static void set_temp_threshold(struct pm860x_battery_info *info, |
| int min, int max) |
| { |
| int data; |
| |
| /* (tmp << 8) / 1800 */ |
| if (min <= 0) |
| data = 0; |
| else |
| data = (min << 8) / 1800; |
| pm860x_reg_write(info->i2c, PM8607_GPADC1_HIGHTH, data); |
| dev_dbg(info->dev, "TEMP_HIGHTH : min: %d, 0x%x\n", min, data); |
| |
| if (max <= 0) |
| data = 0xff; |
| else |
| data = (max << 8) / 1800; |
| pm860x_reg_write(info->i2c, PM8607_GPADC1_LOWTH, data); |
| dev_dbg(info->dev, "TEMP_LOWTH:max : %d, 0x%x\n", max, data); |
| } |
| |
| static int measure_temp(struct pm860x_battery_info *info, int *data) |
| { |
| int ret; |
| int temp; |
| int min; |
| int max; |
| |
| if (info->temp_type == PM860X_TEMP_TINT) { |
| ret = measure_12bit_voltage(info, PM8607_TINT_MEAS1, data); |
| if (ret) |
| return ret; |
| *data = (*data - 884) * 1000 / 3611; |
| } else { |
| ret = measure_12bit_voltage(info, PM8607_GPADC1_MEAS1, data); |
| if (ret) |
| return ret; |
| /* meausered Vtbat(mV) / Ibias_current(11uA)*/ |
| *data = (*data * 1000) / GPBIAS2_GPADC1_UA; |
| |
| if (*data > TBAT_NEG_25D) { |
| temp = -30; /* over cold , suppose -30 roughly */ |
| max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, 0, max); |
| } else if (*data > TBAT_NEG_10D) { |
| temp = -15; /* -15 degree, code */ |
| max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, 0, max); |
| } else if (*data > TBAT_0D) { |
| temp = -5; /* -5 degree */ |
| min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, min, max); |
| } else if (*data > TBAT_10D) { |
| temp = 5; /* in range of (0, 10) */ |
| min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, min, max); |
| } else if (*data > TBAT_20D) { |
| temp = 15; /* in range of (10, 20) */ |
| min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, min, max); |
| } else if (*data > TBAT_30D) { |
| temp = 25; /* in range of (20, 30) */ |
| min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, min, max); |
| } else if (*data > TBAT_40D) { |
| temp = 35; /* in range of (30, 40) */ |
| min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000; |
| max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, min, max); |
| } else { |
| min = TBAT_40D * GPBIAS2_GPADC1_UA / 1000; |
| set_temp_threshold(info, min, 0); |
| temp = 45; /* over heat ,suppose 45 roughly */ |
| } |
| |
| dev_dbg(info->dev, "temp_C:%d C,temp_mv:%d mv\n", temp, *data); |
| *data = temp; |
| } |
| return 0; |
| } |
| |
| static int calc_resistor(struct pm860x_battery_info *info) |
| { |
| int vbatt_sum1; |
| int vbatt_sum2; |
| int chg_current; |
| int ibatt_sum1; |
| int ibatt_sum2; |
| int data; |
| int ret; |
| int i; |
| |
| ret = measure_current(info, &data); |
| /* make sure that charging is launched by data > 0 */ |
| if (ret || data < 0) |
| goto out; |
| |
| ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data); |
| if (ret) |
| goto out; |
| /* calculate resistor only in CC charge mode */ |
| if (data < VBATT_RESISTOR_MIN || data > VBATT_RESISTOR_MAX) |
| goto out; |
| |
| /* current is saved */ |
| if (set_charger_current(info, 500, &chg_current)) |
| goto out; |
| |
| /* |
| * set charge current as 500mA, wait about 500ms till charging |
| * process is launched and stable with the newer charging current. |
| */ |
| msleep(500); |
| |
| for (i = 0, vbatt_sum1 = 0, ibatt_sum1 = 0; i < 10; i++) { |
| ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data); |
| if (ret) |
| goto out_meas; |
| vbatt_sum1 += data; |
| ret = measure_current(info, &data); |
| if (ret) |
| goto out_meas; |
| |
| if (data < 0) |
| ibatt_sum1 = ibatt_sum1 - data; /* discharging */ |
| else |
| ibatt_sum1 = ibatt_sum1 + data; /* charging */ |
| } |
| |
| if (set_charger_current(info, 100, &ret)) |
| goto out_meas; |
| /* |
| * set charge current as 100mA, wait about 500ms till charging |
| * process is launched and stable with the newer charging current. |
| */ |
| msleep(500); |
| |
| for (i = 0, vbatt_sum2 = 0, ibatt_sum2 = 0; i < 10; i++) { |
| ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data); |
| if (ret) |
| goto out_meas; |
| vbatt_sum2 += data; |
| ret = measure_current(info, &data); |
| if (ret) |
| goto out_meas; |
| |
| if (data < 0) |
| ibatt_sum2 = ibatt_sum2 - data; /* discharging */ |
| else |
| ibatt_sum2 = ibatt_sum2 + data; /* charging */ |
| } |
| |
| /* restore current setting */ |
| if (set_charger_current(info, chg_current, &ret)) |
| goto out_meas; |
| |
| if ((vbatt_sum1 > vbatt_sum2) && (ibatt_sum1 > ibatt_sum2) && |
| (ibatt_sum2 > 0)) { |
| /* calculate resistor in discharging case */ |
| data = 1000 * (vbatt_sum1 - vbatt_sum2) |
| / (ibatt_sum1 - ibatt_sum2); |
| if ((data - info->resistor > 0) && |
| (data - info->resistor < info->resistor)) |
| info->resistor = data; |
| if ((info->resistor - data > 0) && |
| (info->resistor - data < data)) |
| info->resistor = data; |
| } |
| return 0; |
| |
| out_meas: |
| set_charger_current(info, chg_current, &ret); |
| out: |
| return -EINVAL; |
| } |
| |
| static int calc_capacity(struct pm860x_battery_info *info, int *cap) |
| { |
| int ret; |
| int data; |
| int ibat; |
| int cap_ocv = 0; |
| int cap_cc = 0; |
| |
| ret = calc_ccnt(info, &ccnt_data); |
| if (ret) |
| goto out; |
| soc: |
| data = info->max_capacity * info->start_soc / 100; |
| if (ccnt_data.total_dischg - ccnt_data.total_chg <= data) { |
| cap_cc = |
| data + ccnt_data.total_chg - ccnt_data.total_dischg; |
| } else { |
| clear_ccnt(info, &ccnt_data); |
| calc_soc(info, OCV_MODE_ACTIVE, &info->start_soc); |
| dev_dbg(info->dev, "restart soc = %d !\n", |
| info->start_soc); |
| goto soc; |
| } |
| |
| cap_cc = cap_cc * 100 / info->max_capacity; |
| if (cap_cc < 0) |
| cap_cc = 0; |
| else if (cap_cc > 100) |
| cap_cc = 100; |
| |
| dev_dbg(info->dev, "%s, last cap : %d", __func__, |
| info->last_capacity); |
| |
| ret = measure_current(info, &ibat); |
| if (ret) |
| goto out; |
| /* Calculate the capacity when discharging(ibat < 0) */ |
| if (ibat < 0) { |
| ret = calc_soc(info, OCV_MODE_ACTIVE, &cap_ocv); |
| if (ret) |
| cap_ocv = info->last_capacity; |
| ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data); |
| if (ret) |
| goto out; |
| if (data <= LOW_BAT_THRESHOLD) { |
| /* choose the lower capacity value to report |
| * between vbat and CC when vbat < 3.6v; |
| * than 3.6v; |
| */ |
| *cap = min(cap_ocv, cap_cc); |
| } else { |
| /* when detect vbat > 3.6v, but cap_cc < 15,and |
| * cap_ocv is 10% larger than cap_cc, we can think |
| * CC have some accumulation error, switch to OCV |
| * to estimate capacity; |
| * */ |
| if (cap_cc < 15 && cap_ocv - cap_cc > 10) |
| *cap = cap_ocv; |
| else |
| *cap = cap_cc; |
| } |
| /* when discharging, make sure current capacity |
| * is lower than last*/ |
| if (*cap > info->last_capacity) |
| *cap = info->last_capacity; |
| } else { |
| *cap = cap_cc; |
| } |
| info->last_capacity = *cap; |
| |
| dev_dbg(info->dev, "%s, cap_ocv:%d cap_cc:%d, cap:%d\n", |
| (ibat < 0) ? "discharging" : "charging", |
| cap_ocv, cap_cc, *cap); |
| /* |
| * store the current capacity to RTC domain register, |
| * after next power up , it will be restored. |
| */ |
| pm860x_set_bits(info->i2c, PM8607_RTC_MISC2, RTC_SOC_5LSB, |
| (*cap & 0x1F) << 3); |
| pm860x_set_bits(info->i2c, PM8607_RTC1, RTC_SOC_3MSB, |
| ((*cap >> 5) & 0x3)); |
| return 0; |
| out: |
| return ret; |
| } |
| |
| static void pm860x_external_power_changed(struct power_supply *psy) |
| { |
| struct pm860x_battery_info *info = dev_get_drvdata(psy->dev.parent); |
| |
| calc_resistor(info); |
| } |
| |
| static int pm860x_batt_get_prop(struct power_supply *psy, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| struct pm860x_battery_info *info = dev_get_drvdata(psy->dev.parent); |
| int data; |
| int ret; |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_PRESENT: |
| val->intval = info->present; |
| break; |
| case POWER_SUPPLY_PROP_CAPACITY: |
| ret = calc_capacity(info, &data); |
| if (ret) |
| return ret; |
| if (data < 0) |
| data = 0; |
| else if (data > 100) |
| data = 100; |
| /* return 100 if battery is not attached */ |
| if (!info->present) |
| data = 100; |
| val->intval = data; |
| break; |
| case POWER_SUPPLY_PROP_TECHNOLOGY: |
| val->intval = POWER_SUPPLY_TECHNOLOGY_LION; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| /* return real vbatt Voltage */ |
| ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data); |
| if (ret) |
| return ret; |
| val->intval = data * 1000; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_AVG: |
| /* return Open Circuit Voltage (not measured voltage) */ |
| ret = calc_ocv(info, &data); |
| if (ret) |
| return ret; |
| val->intval = data * 1000; |
| break; |
| case POWER_SUPPLY_PROP_CURRENT_NOW: |
| ret = measure_current(info, &data); |
| if (ret) |
| return ret; |
| val->intval = data; |
| break; |
| case POWER_SUPPLY_PROP_TEMP: |
| if (info->present) { |
| ret = measure_temp(info, &data); |
| if (ret) |
| return ret; |
| data *= 10; |
| } else { |
| /* Fake Temp 25C Without Battery */ |
| data = 250; |
| } |
| val->intval = data; |
| break; |
| default: |
| return -ENODEV; |
| } |
| return 0; |
| } |
| |
| static int pm860x_batt_set_prop(struct power_supply *psy, |
| enum power_supply_property psp, |
| const union power_supply_propval *val) |
| { |
| struct pm860x_battery_info *info = dev_get_drvdata(psy->dev.parent); |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_CHARGE_FULL: |
| clear_ccnt(info, &ccnt_data); |
| info->start_soc = 100; |
| dev_dbg(info->dev, "chg done, update soc = %d\n", |
| info->start_soc); |
| break; |
| default: |
| return -EPERM; |
| } |
| |
| return 0; |
| } |
| |
| |
| static enum power_supply_property pm860x_batt_props[] = { |
| POWER_SUPPLY_PROP_PRESENT, |
| POWER_SUPPLY_PROP_CAPACITY, |
| POWER_SUPPLY_PROP_TECHNOLOGY, |
| POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| POWER_SUPPLY_PROP_VOLTAGE_AVG, |
| POWER_SUPPLY_PROP_CURRENT_NOW, |
| POWER_SUPPLY_PROP_TEMP, |
| }; |
| |
| static const struct power_supply_desc pm860x_battery_desc = { |
| .name = "battery-monitor", |
| .type = POWER_SUPPLY_TYPE_BATTERY, |
| .properties = pm860x_batt_props, |
| .num_properties = ARRAY_SIZE(pm860x_batt_props), |
| .get_property = pm860x_batt_get_prop, |
| .set_property = pm860x_batt_set_prop, |
| .external_power_changed = pm860x_external_power_changed, |
| }; |
| |
| static int pm860x_battery_probe(struct platform_device *pdev) |
| { |
| struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
| struct pm860x_battery_info *info; |
| struct pm860x_power_pdata *pdata; |
| int ret; |
| |
| info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| info->irq_cc = platform_get_irq(pdev, 0); |
| if (info->irq_cc <= 0) { |
| dev_err(&pdev->dev, "No IRQ resource!\n"); |
| return -EINVAL; |
| } |
| |
| info->irq_batt = platform_get_irq(pdev, 1); |
| if (info->irq_batt <= 0) { |
| dev_err(&pdev->dev, "No IRQ resource!\n"); |
| return -EINVAL; |
| } |
| |
| info->chip = chip; |
| info->i2c = |
| (chip->id == CHIP_PM8607) ? chip->client : chip->companion; |
| info->dev = &pdev->dev; |
| info->status = POWER_SUPPLY_STATUS_UNKNOWN; |
| pdata = pdev->dev.platform_data; |
| |
| mutex_init(&info->lock); |
| platform_set_drvdata(pdev, info); |
| |
| pm860x_init_battery(info); |
| |
| if (pdata && pdata->max_capacity) |
| info->max_capacity = pdata->max_capacity; |
| else |
| info->max_capacity = 1500; /* set default capacity */ |
| if (pdata && pdata->resistor) |
| info->resistor = pdata->resistor; |
| else |
| info->resistor = 300; /* set default internal resistor */ |
| |
| info->battery = devm_power_supply_register(&pdev->dev, |
| &pm860x_battery_desc, |
| NULL); |
| if (IS_ERR(info->battery)) |
| return PTR_ERR(info->battery); |
| info->battery->dev.parent = &pdev->dev; |
| |
| ret = devm_request_threaded_irq(chip->dev, info->irq_cc, NULL, |
| pm860x_coulomb_handler, IRQF_ONESHOT, |
| "coulomb", info); |
| if (ret < 0) { |
| dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", |
| info->irq_cc, ret); |
| return ret; |
| } |
| |
| ret = devm_request_threaded_irq(chip->dev, info->irq_batt, NULL, |
| pm860x_batt_handler, |
| IRQF_ONESHOT, "battery", info); |
| if (ret < 0) { |
| dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", |
| info->irq_batt, ret); |
| return ret; |
| } |
| |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int pm860x_battery_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
| |
| if (device_may_wakeup(dev)) |
| chip->wakeup_flag |= 1 << PM8607_IRQ_CC; |
| return 0; |
| } |
| |
| static int pm860x_battery_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
| |
| if (device_may_wakeup(dev)) |
| chip->wakeup_flag &= ~(1 << PM8607_IRQ_CC); |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(pm860x_battery_pm_ops, |
| pm860x_battery_suspend, pm860x_battery_resume); |
| |
| static struct platform_driver pm860x_battery_driver = { |
| .driver = { |
| .name = "88pm860x-battery", |
| .pm = &pm860x_battery_pm_ops, |
| }, |
| .probe = pm860x_battery_probe, |
| }; |
| module_platform_driver(pm860x_battery_driver); |
| |
| MODULE_DESCRIPTION("Marvell 88PM860x Battery driver"); |
| MODULE_LICENSE("GPL"); |