linux/drivers/power/88pm860x_battery.c
Krzysztof Kozlowski 297d716f62 power_supply: Change ownership from driver to core
Change the ownership of power_supply structure from each driver
implementing the class to the power supply core.

The patch changes power_supply_register() function thus all drivers
implementing power supply class are adjusted.

Each driver provides the implementation of power supply. However it
should not be the owner of power supply class instance because it is
exposed by core to other subsystems with power_supply_get_by_name().
These other subsystems have no knowledge when the driver will unregister
the power supply. This leads to several issues when driver is unbound -
mostly because user of power supply accesses freed memory.

Instead let the core own the instance of struct 'power_supply'.  Other
users of this power supply will still access valid memory because it
will be freed when device reference count reaches 0. Currently this
means "it will leak" but power_supply_put() call in next patches will
solve it.

This solves invalid memory references in following race condition
scenario:

Thread 1: charger manager
Thread 2: power supply driver, used by charger manager

THREAD 1 (charger manager)         THREAD 2 (power supply driver)
==========================         ==============================
psy = power_supply_get_by_name()
                                   Driver unbind, .remove
                                     power_supply_unregister()
                                     Device fully removed
psy->get_property()

The 'get_property' call is executed in invalid context because the driver was
unbound and struct 'power_supply' memory was freed.

This could be observed easily with charger manager driver (here compiled
with max17040 fuel gauge):

$ cat /sys/devices/virtual/power_supply/cm-battery/capacity &
$ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind
[   55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[   55.732584] pgd = d98d4000
[   55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000
[   55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM
[   55.746210] Modules linked in:
[   55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G        W       3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496
[   55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[   55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000
[   55.771647] PC is at 0x0
[   55.774182] LR is at charger_get_property+0x2f4/0x36c
[   55.779201] pc : [<00000000>]    lr : [<c034b0b4>]    psr: 60000013
[   55.779201] sp : daf55e90  ip : 00000003  fp : 00000000
[   55.790657] r10: 00000000  r9 : c06e2878  r8 : d9b26c68
[   55.795865] r7 : dad81610  r6 : daec7410  r5 : daf55ebc  r4 : 00000000
[   55.802367] r3 : 00000000  r2 : daf55ebc  r1 : 0000002a  r0 : d9b26c68
[   55.808879] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   55.815994] Control: 10c5387d  Table: 598d406a  DAC: 00000015
[   55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210)
[   55.827451] Stack: (0xdaf55e90 to 0xdaf56000)
[   55.831795] 5e80:                                     60000013 c01459c4 0000002a c06f8ef8
[   55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4
[   55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80
[   55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001
[   55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000
[   55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000
[   55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124
[   55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550
[   55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364
[   55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c
[   55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000
[   55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000
[   55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c)
[   55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48)
[   55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104)
[   55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28)
[   55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484)
[   55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c)
[   55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100)
[   55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c)
[   55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48)
[   56.000626] Code: bad PC value
[   56.011652] ---[ end trace 7b64343fbdae8ef1 ]---

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

[for the nvec part]
Reviewed-by: Marc Dietrich <marvin24@gmx.de>

[for compal-laptop.c]
Acked-by: Darren Hart <dvhart@linux.intel.com>

[for the mfd part]
Acked-by: Lee Jones <lee.jones@linaro.org>

[for the hid part]
Acked-by: Jiri Kosina <jkosina@suse.cz>

[for the acpi part]
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-13 23:15:51 +01:00

1037 lines
26 KiB
C

/*
* Battery driver for Marvell 88PM860x PMIC
*
* Copyright (c) 2012 Marvell International Ltd.
* Author: Jett Zhou <jtzhou@marvell.com>
* Haojian Zhuang <haojian.zhuang@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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 = 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 = request_threaded_irq(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);
goto out_reg;
}
ret = request_threaded_irq(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);
goto out_coulomb;
}
return 0;
out_coulomb:
free_irq(info->irq_cc, info);
out_reg:
power_supply_unregister(info->battery);
return ret;
}
static int pm860x_battery_remove(struct platform_device *pdev)
{
struct pm860x_battery_info *info = platform_get_drvdata(pdev);
free_irq(info->irq_batt, info);
free_irq(info->irq_cc, info);
power_supply_unregister(info->battery);
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,
.remove = pm860x_battery_remove,
};
module_platform_driver(pm860x_battery_driver);
MODULE_DESCRIPTION("Marvell 88PM860x Battery driver");
MODULE_LICENSE("GPL");