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staging: typec: fusb302: Export current-limit through a power_supply class dev 

The fusb302 Type-C port-controller cannot control the current-limit
directly, so we need to exported the limit so that another driver
(e.g. the charger driver) can pick the limit up and configure the
system accordingly.

The power-supply subsys already provides infrastructure for this,
power-supply devices have the notion of being supplied by another
power-supply and have properties through which we can export the
current-limit.

Register a power_supply and export the current-limit through the
power_supply's current-max property.

Cc: "Yueyao (Nathan) Zhu" <yueyao@google.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2017-08-30 11:48:10 +02:00 committed by Greg Kroah-Hartman
parent 382099d6bc
commit 4046c06fb1
2 changed files with 62 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/staging/typec/fusb302/Kconfig
View File

@ -1,6 +1,6 @@
config TYPEC_FUSB302
tristate "Fairchild FUSB302 Type-C chip driver"
depends on I2C
depends on I2C && POWER_SUPPLY
help
The Fairchild FUSB302 Type-C chip driver that works with
Type-C Port Controller Manager to provide USB PD and USB

63
drivers/staging/typec/fusb302/fusb302.c
View File

@ -28,6 +28,7 @@
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/power_supply.h>
#include <linux/proc_fs.h>
#include <linux/regulator/consumer.h>
#include <linux/sched/clock.h>
@ -108,6 +109,11 @@ struct fusb302_chip {
/* lock for sharing chip states */
struct mutex lock;
/* psy + psy status */
struct power_supply *psy;
u32 current_limit;
u32 supply_voltage;
/* chip status */
enum toggling_mode toggling_mode;
enum src_current_status src_current_status;
@ -876,11 +882,13 @@ static int tcpm_set_vbus(struct tcpc_dev *dev, bool on, bool charge)
chip->vbus_on = on;
fusb302_log(chip, "vbus := %s", on ? "On" : "Off");
}
if (chip->charge_on == charge)
if (chip->charge_on == charge) {
fusb302_log(chip, "charge is already %s",
charge ? "On" : "Off");
else
} else {
chip->charge_on = charge;
power_supply_changed(chip->psy);
}
done:
mutex_unlock(&chip->lock);
@ -896,6 +904,11 @@ static int tcpm_set_current_limit(struct tcpc_dev *dev, u32 max_ma, u32 mv)
fusb302_log(chip, "current limit: %d ma, %d mv (not implemented)",
max_ma, mv);
chip->supply_voltage = mv;
chip->current_limit = max_ma;
power_supply_changed(chip->psy);
return 0;
}
@ -1681,6 +1694,43 @@ done:
return IRQ_HANDLED;
}
static int fusb302_psy_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct fusb302_chip *chip = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = chip->charge_on;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = chip->supply_voltage * 1000; /* mV -> µV */
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
val->intval = chip->current_limit * 1000; /* mA -> µA */
break;
default:
return -ENODATA;
}
return 0;
}
static enum power_supply_property fusb302_psy_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_MAX,
};
const struct power_supply_desc fusb302_psy_desc = {
.name = "fusb302-typec-source",
.type = POWER_SUPPLY_TYPE_USB_TYPE_C,
.properties = fusb302_psy_properties,
.num_properties = ARRAY_SIZE(fusb302_psy_properties),
.get_property = fusb302_psy_get_property,
};
static int init_gpio(struct fusb302_chip *chip)
{
struct device_node *node;
@ -1720,6 +1770,7 @@ static int fusb302_probe(struct i2c_client *client,
struct fusb302_chip *chip;
struct i2c_adapter *adapter;
struct device *dev = &client->dev;
struct power_supply_config cfg = {};
const char *name;
int ret = 0;
u32 v;
@ -1766,6 +1817,14 @@ static int fusb302_probe(struct i2c_client *client,
return -EPROBE_DEFER;
}
cfg.drv_data = chip;
chip->psy = devm_power_supply_register(dev, &fusb302_psy_desc, &cfg);
if (IS_ERR(chip->psy)) {
ret = PTR_ERR(chip->psy);
dev_err(chip->dev, "Error registering power-supply: %d\n", ret);
return ret;
}
ret = fusb302_debugfs_init(chip);
if (ret < 0)
return ret;