From 4046c06fb11cbb5d90324da2df7e2acafcb9826c Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 30 Aug 2017 11:48:10 +0200 Subject: [PATCH] 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" Signed-off-by: Hans de Goede Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/staging/typec/fusb302/Kconfig | 2 +- drivers/staging/typec/fusb302/fusb302.c | 63 ++++++++++++++++++++++++- 2 files changed, 62 insertions(+), 3 deletions(-) diff --git a/drivers/staging/typec/fusb302/Kconfig b/drivers/staging/typec/fusb302/Kconfig index fce099ff39fe..48a4f2fcee03 100644 --- a/drivers/staging/typec/fusb302/Kconfig +++ b/drivers/staging/typec/fusb302/Kconfig @@ -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 diff --git a/drivers/staging/typec/fusb302/fusb302.c b/drivers/staging/typec/fusb302/fusb302.c index 6f007f66d597..cf6355f59cd9 100644 --- a/drivers/staging/typec/fusb302/fusb302.c +++ b/drivers/staging/typec/fusb302/fusb302.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -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; -- 2.20.1