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linux_dsm_epyc7002/drivers/power/da9052-battery.c
Nickolai Zeldovich c4f3422630 da9052-battery: Avoid out-of-range array access 
Avoid accessing vc_tbl_ref[3], which is one past the end of that array, in
da9052_determine_vc_tbl_index(), by adjusting the loop bound.

(Hint: there is 'i + 1' inside the loop.)

Signed-off-by: Nickolai Zeldovich <nickolai@csail.mit.edu>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
2013-01-06 14:34:26 -08:00

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/*
* Batttery Driver for Dialog DA9052 PMICs
*
* Copyright(c) 2011 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* 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.
*/
#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 = container_of(psy, struct da9052_battery,
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 template_battery = {
.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;
int ret;
int i;
bat = kzalloc(sizeof(struct da9052_battery), GFP_KERNEL);
if (!bat)
return -ENOMEM;
bat->da9052 = dev_get_drvdata(pdev->dev.parent);
bat->psy = template_battery;
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)
bat->psy.use_for_apm = pdata->use_for_apm;
else
bat->psy.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;
}
}
ret = power_supply_register(&pdev->dev, &bat->psy);
if (ret)
goto err;
platform_set_drvdata(pdev, bat);
return 0;
err:
while (--i >= 0)
da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
kfree(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);
kfree(bat);
return 0;
}
static struct platform_driver da9052_bat_driver = {
.probe = da9052_bat_probe,
.remove = da9052_bat_remove,
.driver = {
.name = "da9052-bat",
.owner = THIS_MODULE,
},
};
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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