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alistair23-linux/drivers/power/supply/da9052-battery.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Batttery Driver for Dialog DA9052 PMICs
*
* Copyright(c) 2011 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*/
#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/pdata.h>
#include <linux/mfd/da9052/reg.h>
/* STATIC CONFIGURATION */
#define DA9052_BAT_CUTOFF_VOLT 2800
#define DA9052_BAT_TSH 62000
#define DA9052_BAT_LOW_CAP 4
#define DA9052_AVG_SZ 4
#define DA9052_VC_TBL_SZ 68
#define DA9052_VC_TBL_REF_SZ 3
#define DA9052_ISET_USB_MASK 0x0F
#define DA9052_CHG_USB_ILIM_MASK 0x40
#define DA9052_CHG_LIM_COLS 16
#define DA9052_MEAN(x, y) ((x + y) / 2)
enum charger_type_enum {
DA9052_NOCHARGER = 1,
DA9052_CHARGER,
};
static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = {
{70, 80, 90, 100, 110, 120, 400, 450,
500, 550, 600, 650, 700, 900, 1100, 1300},
{80, 90, 100, 110, 120, 400, 450, 500,
550, 600, 800, 1000, 1200, 1400, 1600, 1800},
};
static const u16 vc_tbl_ref[3] = {10, 25, 40};
/* Lookup table for voltage vs capacity */
static u32 const vc_tbl[3][68][2] = {
/* For temperature 10 degree Celsius */
{
{4082, 100}, {4036, 98},
{4020, 96}, {4008, 95},
{3997, 93}, {3983, 91},
{3964, 90}, {3943, 88},
{3926, 87}, {3912, 85},
{3900, 84}, {3890, 82},
{3881, 80}, {3873, 79},
{3865, 77}, {3857, 76},
{3848, 74}, {3839, 73},
{3829, 71}, {3820, 70},
{3811, 68}, {3802, 67},
{3794, 65}, {3785, 64},
{3778, 62}, {3770, 61},
{3763, 59}, {3756, 58},
{3750, 56}, {3744, 55},
{3738, 53}, {3732, 52},
{3727, 50}, {3722, 49},
{3717, 47}, {3712, 46},
{3708, 44}, {3703, 43},
{3700, 41}, {3696, 40},
{3693, 38}, {3691, 37},
{3688, 35}, {3686, 34},
{3683, 32}, {3681, 31},
{3678, 29}, {3675, 28},
{3672, 26}, {3669, 25},
{3665, 23}, {3661, 22},
{3656, 21}, {3651, 19},
{3645, 18}, {3639, 16},
{3631, 15}, {3622, 13},
{3611, 12}, {3600, 10},
{3587, 9}, {3572, 7},
{3548, 6}, {3503, 5},
{3420, 3}, {3268, 2},
{2992, 1}, {2746, 0}
},
/* For temperature 25 degree Celsius */
{
{4102, 100}, {4065, 98},
{4048, 96}, {4034, 95},
{4021, 93}, {4011, 92},
{4001, 90}, {3986, 88},
{3968, 87}, {3952, 85},
{3938, 84}, {3926, 82},
{3916, 81}, {3908, 79},
{3900, 77}, {3892, 76},
{3883, 74}, {3874, 73},
{3864, 71}, {3855, 70},
{3846, 68}, {3836, 67},
{3827, 65}, {3819, 64},
{3810, 62}, {3801, 61},
{3793, 59}, {3786, 58},
{3778, 56}, {3772, 55},
{3765, 53}, {3759, 52},
{3754, 50}, {3748, 49},
{3743, 47}, {3738, 46},
{3733, 44}, {3728, 43},
{3724, 41}, {3720, 40},
{3716, 38}, {3712, 37},
{3709, 35}, {3706, 34},
{3703, 33}, {3701, 31},
{3698, 30}, {3696, 28},
{3693, 27}, {3690, 25},
{3687, 24}, {3683, 22},
{3680, 21}, {3675, 19},
{3671, 18}, {3666, 17},
{3660, 15}, {3654, 14},
{3647, 12}, {3639, 11},
{3630, 9}, {3621, 8},
{3613, 6}, {3606, 5},
{3597, 4}, {3582, 2},
{3546, 1}, {2747, 0}
},
/* For temperature 40 degree Celsius */
{
{4114, 100}, {4081, 98},
{4065, 96}, {4050, 95},
{4036, 93}, {4024, 92},
{4013, 90}, {4002, 88},
{3990, 87}, {3976, 85},
{3962, 84}, {3950, 82},
{3939, 81}, {3930, 79},
{3921, 77}, {3912, 76},
{3902, 74}, {3893, 73},
{3883, 71}, {3874, 70},
{3865, 68}, {3856, 67},
{3847, 65}, {3838, 64},
{3829, 62}, {3820, 61},
{3812, 59}, {3803, 58},
{3795, 56}, {3787, 55},
{3780, 53}, {3773, 52},
{3767, 50}, {3761, 49},
{3756, 47}, {3751, 46},
{3746, 44}, {3741, 43},
{3736, 41}, {3732, 40},
{3728, 38}, {3724, 37},
{3720, 35}, {3716, 34},
{3713, 33}, {3710, 31},
{3707, 30}, {3704, 28},
{3701, 27}, {3698, 25},
{3695, 24}, {3691, 22},
{3686, 21}, {3681, 19},
{3676, 18}, {3671, 17},
{3666, 15}, {3661, 14},
{3655, 12}, {3648, 11},
{3640, 9}, {3632, 8},
{3622, 6}, {3616, 5},
{3611, 4}, {3604, 2},
{3594, 1}, {2747, 0}
}
};
struct da9052_battery {
struct da9052 *da9052;
struct power_supply *psy;
struct notifier_block nb;
int charger_type;
int status;
int health;
};
static inline int volt_reg_to_mV(int value)
{
return ((value * 1000) / 512) + 2500;
}
static inline int ichg_reg_to_mA(int value)
{
return (value * 3900) / 1000;
}
static int da9052_read_chgend_current(struct da9052_battery *bat,
int *current_mA)
{
int ret;
if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
return -EINVAL;
ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG);
if (ret < 0)
return ret;
*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND);
return 0;
}
static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA)
{
int ret;
if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
return -EINVAL;
ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG);
if (ret < 0)
return ret;
*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV);
return 0;
}
static int da9052_bat_check_status(struct da9052_battery *bat, int *status)
{
u8 v[2] = {0, 0};
u8 bat_status;
u8 chg_end;
int ret;
int chg_current;
int chg_end_current;
bool dcinsel;
bool dcindet;
bool vbussel;
bool vbusdet;
bool dc;
bool vbus;
ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v);
if (ret < 0)
return ret;
bat_status = v[0];
chg_end = v[1];
dcinsel = bat_status & DA9052_STATUSA_DCINSEL;
dcindet = bat_status & DA9052_STATUSA_DCINDET;
vbussel = bat_status & DA9052_STATUSA_VBUSSEL;
vbusdet = bat_status & DA9052_STATUSA_VBUSDET;
dc = dcinsel && dcindet;
vbus = vbussel && vbusdet;
/* Preference to WALL(DCIN) charger unit */
if (dc || vbus) {
bat->charger_type = DA9052_CHARGER;
/* If charging end flag is set and Charging current is greater
* than charging end limit then battery is charging
*/
if ((chg_end & DA9052_STATUSB_CHGEND) != 0) {
ret = da9052_read_chg_current(bat, &chg_current);
if (ret < 0)
return ret;
ret = da9052_read_chgend_current(bat, &chg_end_current);
if (ret < 0)
return ret;
if (chg_current >= chg_end_current)
bat->status = POWER_SUPPLY_STATUS_CHARGING;
else
bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
/* If Charging end flag is cleared then battery is
* charging
*/
bat->status = POWER_SUPPLY_STATUS_CHARGING;
}
} else if (dcindet || vbusdet) {
bat->charger_type = DA9052_CHARGER;
bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
bat->charger_type = DA9052_NOCHARGER;
bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (status != NULL)
*status = bat->status;
return 0;
}
static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV)
{
int volt;
volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT);
if (volt < 0)
return volt;
*volt_mV = volt_reg_to_mV(volt);
return 0;
}
static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal)
{
int bat_temp;
bat_temp = da9052_adc_read_temp(bat->da9052);
if (bat_temp < 0)
return bat_temp;
if (bat_temp > DA9052_BAT_TSH)
*illegal = 1;
else
*illegal = 0;
return 0;
}
static int da9052_bat_interpolate(int vbat_lower, int vbat_upper,
int level_lower, int level_upper,
int bat_voltage)
{
int tmp;
tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000);
return tmp;
}
static unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp)
{
int i;
if (adc_temp <= vc_tbl_ref[0])
return 0;
if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1])
return DA9052_VC_TBL_REF_SZ - 1;
for (i = 0; i < DA9052_VC_TBL_REF_SZ - 1; i++) {
if ((adc_temp > vc_tbl_ref[i]) &&
(adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])))
return i;
if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))
&& (adc_temp <= vc_tbl_ref[i]))
return i + 1;
}
/*
* For some reason authors of the driver didn't presume that we can
* end up here. It might be OK, but might be not, no one knows for
* sure. Go check your battery, is it on fire?
*/
WARN_ON(1);
return 0;
}
static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity)
{
int adc_temp;
int bat_voltage;
int vbat_lower;
int vbat_upper;
int level_upper;
int level_lower;
int ret;
int flag;
int i = 0;
int j;
ret = da9052_bat_read_volt(bat, &bat_voltage);
if (ret < 0)
return ret;
adc_temp = da9052_adc_read_temp(bat->da9052);
if (adc_temp < 0)
return adc_temp;
i = da9052_determine_vc_tbl_index(adc_temp);
if (bat_voltage >= vc_tbl[i][0][0]) {
*capacity = 100;
return 0;
}
if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
*capacity = 0;
return 0;
}
flag = 0;
for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
if ((bat_voltage <= vc_tbl[i][j][0]) &&
(bat_voltage >= vc_tbl[i][j + 1][0])) {
vbat_upper = vc_tbl[i][j][0];
vbat_lower = vc_tbl[i][j + 1][0];
level_upper = vc_tbl[i][j][1];
level_lower = vc_tbl[i][j + 1][1];
flag = 1;
break;
}
}
if (!flag)
return -EIO;
*capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
level_upper, bat_voltage);
return 0;
}
static int da9052_bat_check_health(struct da9052_battery *bat, int *health)
{
int ret;
int bat_illegal;
int capacity;
ret = da9052_bat_check_presence(bat, &bat_illegal);
if (ret < 0)
return ret;
if (bat_illegal) {
bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
return 0;
}
if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
ret = da9052_bat_read_capacity(bat, &capacity);
if (ret < 0)
return ret;
if (capacity < DA9052_BAT_LOW_CAP)
bat->health = POWER_SUPPLY_HEALTH_DEAD;
else
bat->health = POWER_SUPPLY_HEALTH_GOOD;
}
*health = bat->health;
return 0;
}
static irqreturn_t da9052_bat_irq(int irq, void *data)
{
struct da9052_battery *bat = data;
int virq;
virq = regmap_irq_get_virq(bat->da9052->irq_data, irq);
irq -= virq;
if (irq == DA9052_IRQ_CHGEND)
bat->status = POWER_SUPPLY_STATUS_FULL;
else
da9052_bat_check_status(bat, NULL);
if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
power_supply_changed(bat->psy);
}
return IRQ_HANDLED;
}
static int da9052_USB_current_notifier(struct notifier_block *nb,
unsigned long events, void *data)
{
u8 row;
u8 col;
int *current_mA = data;
int ret;
struct da9052_battery *bat = container_of(nb, struct da9052_battery,
nb);
if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
return -EPERM;
ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
if (ret & DA9052_CHG_USB_ILIM_MASK)
return -EPERM;
if (bat->da9052->chip_id == DA9052)
row = 0;
else
row = 1;
if (*current_mA < da9052_chg_current_lim[row][0] ||
*current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
return -EINVAL;
for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
if (*current_mA <= da9052_chg_current_lim[row][col])
break;
}
return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
DA9052_ISET_USB_MASK, col);
}
static int da9052_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ret;
int illegal;
struct da9052_battery *bat = power_supply_get_drvdata(psy);
ret = da9052_bat_check_presence(bat, &illegal);
if (ret < 0)
return ret;
if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
return -ENODEV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
ret = da9052_bat_check_status(bat, &val->intval);
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval =
(bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
break;
case POWER_SUPPLY_PROP_PRESENT:
ret = da9052_bat_check_presence(bat, &val->intval);
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = da9052_bat_check_health(bat, &val->intval);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
ret = da9052_bat_read_volt(bat, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
ret = da9052_read_chg_current(bat, &val->intval);
break;
case POWER_SUPPLY_PROP_CAPACITY:
ret = da9052_bat_read_capacity(bat, &val->intval);
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = da9052_adc_read_temp(bat->da9052);
ret = val->intval;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
default:
return -EINVAL;
}
return ret;
}
static enum power_supply_property da9052_bat_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TECHNOLOGY,
};
static struct power_supply_desc psy_desc = {
.name = "da9052-bat",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = da9052_bat_props,
.num_properties = ARRAY_SIZE(da9052_bat_props),
.get_property = da9052_bat_get_property,
};
static char *da9052_bat_irqs[] = {
"BATT TEMP",
"DCIN DET",
"DCIN REM",
"VBUS DET",
"VBUS REM",
"CHG END",
};
static int da9052_bat_irq_bits[] = {
DA9052_IRQ_TBAT,
DA9052_IRQ_DCIN,
DA9052_IRQ_DCINREM,
DA9052_IRQ_VBUS,
DA9052_IRQ_VBUSREM,
DA9052_IRQ_CHGEND,
};
static s32 da9052_bat_probe(struct platform_device *pdev)
{
struct da9052_pdata *pdata;
struct da9052_battery *bat;
struct power_supply_config psy_cfg = {};
int ret;
int i;
bat = devm_kzalloc(&pdev->dev, sizeof(struct da9052_battery),
GFP_KERNEL);
if (!bat)
return -ENOMEM;
psy_cfg.drv_data = bat;
bat->da9052 = dev_get_drvdata(pdev->dev.parent);
bat->charger_type = DA9052_NOCHARGER;
bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
bat->nb.notifier_call = da9052_USB_current_notifier;
pdata = bat->da9052->dev->platform_data;
if (pdata != NULL && pdata->use_for_apm)
psy_desc.use_for_apm = pdata->use_for_apm;
else
psy_desc.use_for_apm = 1;
for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
ret = da9052_request_irq(bat->da9052,
da9052_bat_irq_bits[i], da9052_bat_irqs[i],
da9052_bat_irq, bat);
if (ret != 0) {
dev_err(bat->da9052->dev,
"DA9052 failed to request %s IRQ: %d\n",
da9052_bat_irqs[i], ret);
goto err;
}
}
bat->psy = power_supply_register(&pdev->dev, &psy_desc, &psy_cfg);
if (IS_ERR(bat->psy)) {
ret = PTR_ERR(bat->psy);
goto err;
}
platform_set_drvdata(pdev, bat);
return 0;
err:
while (--i >= 0)
da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
return ret;
}
static int da9052_bat_remove(struct platform_device *pdev)
{
int i;
struct da9052_battery *bat = platform_get_drvdata(pdev);
for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++)
da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
power_supply_unregister(bat->psy);
return 0;
}
static struct platform_driver da9052_bat_driver = {
.probe = da9052_bat_probe,
.remove = da9052_bat_remove,
.driver = {
.name = "da9052-bat",
},
};
module_platform_driver(da9052_bat_driver);
MODULE_DESCRIPTION("DA9052 BAT Device Driver");
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-bat");
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