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Subject[PATCH v5 2/7] power: supply: max17040: Use regmap i2c
Date
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>
---
drivers/power/supply/Kconfig | 1 +
drivers/power/supply/max17040_battery.c | 219 ++++++++++--------------
2 files changed, 93 insertions(+), 127 deletions(-)

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index a4657484f38be..47a4e1d363fc3 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -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
diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index 19b9e710bbd2f..fae4217960761 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -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 (max17040_get_soc(chip) > MAX17040_BATTERY_FULL)
+ return POWER_SUPPLY_STATUS_FULL;

- if (chip->pdata->charger_online()) {
+ 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);
--
2.28.0
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