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power: supply: max17040: Use regmap i2c 

Rewrite i2c operations from i2c client read/write to regmap i2c. As
a result, most private functions now accept the private driver data
instead of an i2c client pointer.

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Tested-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Iskren Chernev 2020-09-22 14:42:32 +03:00 committed by Sebastian Reichel
parent e55a50613d
commit 6455a8a84b
2 changed files with 93 additions and 127 deletions
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1
drivers/power/supply/Kconfig
View File

@ -367,6 +367,7 @@ config AXP288_FUEL_GAUGE
config BATTERY_MAX17040
tristate "Maxim MAX17040 Fuel Gauge"
depends on I2C
select REGMAP_I2C
help
MAX17040 is fuel-gauge systems for lithium-ion (Li+) batteries
in handheld and portable equipment. The MAX17040 is configured

219
drivers/power/supply/max17040_battery.c
View File

@ -16,32 +16,30 @@
#include <linux/interrupt.h>
#include <linux/power_supply.h>
#include <linux/max17040_battery.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define MAX17040_VCELL 0x02
#define MAX17040_SOC 0x04
#define MAX17040_MODE 0x06
#define MAX17040_VER 0x08
#define MAX17040_RCOMP 0x0C
#define MAX17040_CONFIG 0x0C
#define MAX17040_CMD 0xFE
#define MAX17040_DELAY 1000
#define MAX17040_BATTERY_FULL 95
#define MAX17040_ATHD_MASK 0xFFC0
#define MAX17040_ATHD_MASK 0x3f
#define MAX17040_ATHD_DEFAULT_POWER_UP 4
struct max17040_chip {
struct i2c_client *client;
struct regmap *regmap;
struct delayed_work work;
struct power_supply *battery;
struct max17040_platform_data *pdata;
/* State Of Connect */
int online;
/* battery voltage */
int vcell;
/* battery capacity */
int soc;
/* State Of Charge */
@ -50,138 +48,68 @@ struct max17040_chip {
u32 low_soc_alert;
};
static int max17040_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
static int max17040_reset(struct max17040_chip *chip)
{
struct max17040_chip *chip = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = chip->status;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = chip->online;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = chip->vcell;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = chip->soc;
break;
case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
val->intval = chip->low_soc_alert;
break;
default:
return -EINVAL;
}
return 0;
return regmap_write(chip->regmap, MAX17040_CMD, 0x0054);
}
static int max17040_write_reg(struct i2c_client *client, int reg, u16 value)
static int max17040_set_low_soc_alert(struct max17040_chip *chip, u32 level)
{
int ret;
ret = i2c_smbus_write_word_swapped(client, reg, value);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int max17040_read_reg(struct i2c_client *client, int reg)
{
int ret;
ret = i2c_smbus_read_word_swapped(client, reg);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static void max17040_reset(struct i2c_client *client)
{
max17040_write_reg(client, MAX17040_CMD, 0x0054);
}
static int max17040_set_low_soc_alert(struct i2c_client *client, u32 level)
{
int ret;
u16 data;
level = 32 - level;
data = max17040_read_reg(client, MAX17040_RCOMP);
/* clear the alrt bit and set LSb 5 bits */
data &= MAX17040_ATHD_MASK;
data |= level;
ret = max17040_write_reg(client, MAX17040_RCOMP, data);
return ret;
return regmap_update_bits(chip->regmap, MAX17040_CONFIG,
MAX17040_ATHD_MASK, level);
}
static void max17040_get_vcell(struct i2c_client *client)
static int max17040_get_vcell(struct max17040_chip *chip)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
u16 vcell;
u32 vcell;
vcell = max17040_read_reg(client, MAX17040_VCELL);
regmap_read(chip->regmap, MAX17040_VCELL, &vcell);
chip->vcell = (vcell >> 4) * 1250;
return (vcell >> 4) * 1250;
}
static void max17040_get_soc(struct i2c_client *client)
static int max17040_get_soc(struct max17040_chip *chip)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
u16 soc;
u32 soc;
soc = max17040_read_reg(client, MAX17040_SOC);
regmap_read(chip->regmap, MAX17040_SOC, &soc);
chip->soc = (soc >> 8);
return soc >> 8;
}
static void max17040_get_version(struct i2c_client *client)
static int max17040_get_version(struct max17040_chip *chip)
{
u16 version;
int ret;
u32 version;
version = max17040_read_reg(client, MAX17040_VER);
ret = regmap_read(chip->regmap, MAX17040_VER, &version);
dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver 0x%x\n", version);
return ret ? ret : version;
}
static void max17040_get_online(struct i2c_client *client)
static int max17040_get_online(struct max17040_chip *chip)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
if (chip->pdata && chip->pdata->battery_online)
chip->online = chip->pdata->battery_online();
else
chip->online = 1;
return chip->pdata && chip->pdata->battery_online ?
chip->pdata->battery_online() : 1;
}
static void max17040_get_status(struct i2c_client *client)
static int max17040_get_status(struct max17040_chip *chip)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
if (!chip->pdata || !chip->pdata->charger_online
|| !chip->pdata->charger_enable) {
chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
return;
}
|| !chip->pdata->charger_enable)
return POWER_SUPPLY_STATUS_UNKNOWN;
if (chip->pdata->charger_online()) {
if (max17040_get_soc(chip) > MAX17040_BATTERY_FULL)
return POWER_SUPPLY_STATUS_FULL;
if (chip->pdata->charger_online())
if (chip->pdata->charger_enable())
chip->status = POWER_SUPPLY_STATUS_CHARGING;
return POWER_SUPPLY_STATUS_CHARGING;
else
chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (chip->soc > MAX17040_BATTERY_FULL)
chip->status = POWER_SUPPLY_STATUS_FULL;
return POWER_SUPPLY_STATUS_NOT_CHARGING;
else
return POWER_SUPPLY_STATUS_DISCHARGING;
}
static int max17040_get_of_data(struct max17040_chip *chip)
@ -193,18 +121,18 @@ static int max17040_get_of_data(struct max17040_chip *chip)
"maxim,alert-low-soc-level",
&chip->low_soc_alert);
if (chip->low_soc_alert <= 0 || chip->low_soc_alert >= 33)
if (chip->low_soc_alert <= 0 || chip->low_soc_alert >= 33) {
dev_err(dev, "maxim,alert-low-soc-level out of bounds\n");
return -EINVAL;
}
return 0;
}
static void max17040_check_changes(struct i2c_client *client)
static void max17040_check_changes(struct max17040_chip *chip)
{
max17040_get_vcell(client);
max17040_get_soc(client);
max17040_get_online(client);
max17040_get_status(client);
chip->soc = max17040_get_soc(chip);
chip->status = max17040_get_status(chip);
}
static void max17040_queue_work(struct max17040_chip *chip)
@ -230,7 +158,7 @@ static void max17040_work(struct work_struct *work)
/* store SOC and status to check changes */
last_soc = chip->soc;
last_status = chip->status;
max17040_check_changes(chip->client);
max17040_check_changes(chip);
/* check changes and send uevent */
if (last_soc != chip->soc || last_status != chip->status)
@ -242,17 +170,17 @@ static void max17040_work(struct work_struct *work)
static irqreturn_t max17040_thread_handler(int id, void *dev)
{
struct max17040_chip *chip = dev;
struct i2c_client *client = chip->client;
dev_warn(&client->dev, "IRQ: Alert battery low level");
dev_warn(&chip->client->dev, "IRQ: Alert battery low level");
/* read registers */
max17040_check_changes(chip->client);
max17040_check_changes(chip);
/* send uevent */
power_supply_changed(chip->battery);
/* reset alert bit */
max17040_set_low_soc_alert(client, chip->low_soc_alert);
max17040_set_low_soc_alert(chip, chip->low_soc_alert);
return IRQ_HANDLED;
}
@ -296,7 +224,7 @@ static int max17040_set_property(struct power_supply *psy,
ret = -EINVAL;
break;
}
ret = max17040_set_low_soc_alert(chip->client, val->intval);
ret = max17040_set_low_soc_alert(chip, val->intval);
chip->low_soc_alert = val->intval;
break;
default:
@ -306,6 +234,41 @@ static int max17040_set_property(struct power_supply *psy,
return ret;
}
static int max17040_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max17040_chip *chip = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = max17040_get_status(chip);
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = max17040_get_online(chip);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = max17040_get_vcell(chip);
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = max17040_get_soc(chip);
break;
case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
val->intval = chip->low_soc_alert;
break;
default:
return -EINVAL;
}
return 0;
}
static const struct regmap_config max17040_regmap = {
.reg_bits = 8,
.reg_stride = 2,
.val_bits = 16,
.val_format_endian = REGMAP_ENDIAN_BIG,
};
static enum power_supply_property max17040_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
@ -340,13 +303,11 @@ static int max17040_probe(struct i2c_client *client,
return -ENOMEM;
chip->client = client;
chip->regmap = devm_regmap_init_i2c(client, &max17040_regmap);
chip->pdata = client->dev.platform_data;
ret = max17040_get_of_data(chip);
if (ret) {
dev_err(&client->dev,
"failed: low SOC alert OF data out of bounds\n");
if (ret)
return ret;
}
i2c_set_clientdata(client, chip);
psy_cfg.drv_data = chip;
@ -358,13 +319,17 @@ static int max17040_probe(struct i2c_client *client,
return PTR_ERR(chip->battery);
}
max17040_reset(client);
max17040_get_version(client);
ret = max17040_get_version(chip);
if (ret < 0)
return ret;
dev_dbg(&chip->client->dev, "MAX17040 Fuel-Gauge Ver 0x%x\n", ret);
max17040_reset(chip);
/* check interrupt */
if (client->irq && of_device_is_compatible(client->dev.of_node,
"maxim,max77836-battery")) {
ret = max17040_set_low_soc_alert(client, chip->low_soc_alert);
ret = max17040_set_low_soc_alert(chip, chip->low_soc_alert);
if (ret) {
dev_err(&client->dev,
"Failed to set low SOC alert: err %d\n", ret);