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power: supply: smb347-charger: Implement USB VBUS regulator 

SMB347 can supply power to USB VBUS, implement the USB VBUS regulator.
USB VBUS needs to be powered for switching OTG-cable USB port into host
mode.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Dmitry Osipenko 2021-07-31 20:38:39 +03:00 committed by Sebastian Reichel
parent efe2175478
commit 565efae96c
2 changed files with 220 additions and 0 deletions
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1
drivers/power/supply/Kconfig
View File

@ -680,6 +680,7 @@ config CHARGER_BQ256XX
config CHARGER_SMB347
tristate "Summit Microelectronics SMB3XX Battery Charger"
depends on I2C
depends on REGULATOR
select REGMAP_I2C
help
Say Y to include support for Summit Microelectronics SMB345,

219
drivers/power/supply/smb347-charger.c
View File

@ -18,6 +18,7 @@
#include <linux/power_supply.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <dt-bindings/power/summit,smb347-charger.h>
@ -63,12 +64,15 @@
#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
#define CFG_THERM_MONITOR_DISABLED BIT(4)
#define CFG_SYSOK 0x08
#define CFG_SYSOK_INOK_ACTIVE_HIGH BIT(0)
#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
#define CFG_OTHER 0x09
#define CFG_OTHER_RID_MASK 0xc0
#define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
#define CFG_OTG 0x0a
#define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
#define CFG_OTG_CURRENT_LIMIT_250mA BIT(2)
#define CFG_OTG_CURRENT_LIMIT_750mA BIT(3)
#define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
#define CFG_OTG_CC_COMPENSATION_MASK 0xc0
#define CFG_OTG_CC_COMPENSATION_SHIFT 6
@ -92,6 +96,7 @@
#define CMD_A 0x30
#define CMD_A_CHG_ENABLED BIT(1)
#define CMD_A_SUSPEND_ENABLED BIT(2)
#define CMD_A_OTG_ENABLED BIT(4)
#define CMD_A_ALLOW_WRITE BIT(7)
#define CMD_B 0x31
#define CMD_C 0x33
@ -133,10 +138,12 @@
* @regmap: pointer to driver regmap
* @mains: power_supply instance for AC/DC power
* @usb: power_supply instance for USB power
* @usb_rdev: USB VBUS regulator device
* @id: SMB charger ID
* @mains_online: is AC/DC input connected
* @usb_online: is USB input connected
* @irq_unsupported: is interrupt unsupported by SMB hardware
* @usb_vbus_enabled: is USB VBUS powered by SMB charger
* @max_charge_current: maximum current (in uA) the battery can be charged
* @max_charge_voltage: maximum voltage (in uV) the battery can be charged
* @pre_charge_current: current (in uA) to use in pre-charging phase
@ -167,6 +174,8 @@
* @use_usb_otg: USB OTG output can be used (not implemented yet)
* @enable_control: how charging enable/disable is controlled
* (driver/pin controls)
* @inok_polarity: polarity of INOK signal which denotes presence of external
* power supply
*
* @use_main, @use_usb, and @use_usb_otg are means to enable/disable
* hardware support for these. This is useful when we want to have for
@ -189,10 +198,12 @@ struct smb347_charger {
struct regmap *regmap;
struct power_supply *mains;
struct power_supply *usb;
struct regulator_dev *usb_rdev;
unsigned int id;
bool mains_online;
bool usb_online;
bool irq_unsupported;
bool usb_vbus_enabled;
unsigned int max_charge_current;
unsigned int max_charge_voltage;
@ -213,6 +224,7 @@ struct smb347_charger {
bool use_usb;
bool use_usb_otg;
unsigned int enable_control;
unsigned int inok_polarity;
};
enum smb_charger_chipid {
@ -362,6 +374,11 @@ static int smb347_charging_set(struct smb347_charger *smb, bool enable)
return 0;
}
if (enable && smb->usb_vbus_enabled) {
dev_dbg(smb->dev, "charging not enabled because USB is in host mode\n");
return 0;
}
return regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
enable ? CMD_A_CHG_ENABLED : 0);
}
@ -1253,6 +1270,13 @@ static void smb347_dt_parse_dev_info(struct smb347_charger *smb)
/* Select charging control */
device_property_read_u32(dev, "summit,enable-charge-control",
&smb->enable_control);
/*
* Polarity of INOK signal indicating presence of external power
* supply connected to the charger.
*/
device_property_read_u32(dev, "summit,inok-polarity",
&smb->inok_polarity);
}
static int smb347_get_battery_info(struct smb347_charger *smb)
@ -1304,6 +1328,160 @@ static int smb347_get_battery_info(struct smb347_charger *smb)
return 0;
}
static int smb347_usb_vbus_get_current_limit(struct regulator_dev *rdev)
{
struct smb347_charger *smb = rdev_get_drvdata(rdev);
unsigned int val;
int ret;
ret = regmap_read(smb->regmap, CFG_OTG, &val);
if (ret < 0)
return ret;
/*
* It's unknown what happens if this bit is unset due to lack of
* access to the datasheet, assume it's limit-enable.
*/
if (!(val & CFG_OTG_CURRENT_LIMIT_250mA))
return 0;
return val & CFG_OTG_CURRENT_LIMIT_750mA ? 750000 : 250000;
}
static int smb347_usb_vbus_set_new_current_limit(struct smb347_charger *smb,
int max_uA)
{
const unsigned int mask = CFG_OTG_CURRENT_LIMIT_750mA |
CFG_OTG_CURRENT_LIMIT_250mA;
unsigned int val = CFG_OTG_CURRENT_LIMIT_250mA;
int ret;
if (max_uA >= 750000)
val |= CFG_OTG_CURRENT_LIMIT_750mA;
ret = regmap_update_bits(smb->regmap, CFG_OTG, mask, val);
if (ret < 0)
dev_err(smb->dev, "failed to change USB current limit\n");
return ret;
}
static int smb347_usb_vbus_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
struct smb347_charger *smb = rdev_get_drvdata(rdev);
int ret;
ret = smb347_set_writable(smb, true, true);
if (ret < 0)
return ret;
ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
smb347_set_writable(smb, false, true);
return ret;
}
static int smb347_usb_vbus_regulator_enable(struct regulator_dev *rdev)
{
struct smb347_charger *smb = rdev_get_drvdata(rdev);
int ret, max_uA;
ret = smb347_set_writable(smb, true, true);
if (ret < 0)
return ret;
smb347_charging_disable(smb);
if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
unsigned int sysok = 0;
if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_LOW)
sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;
/*
* VBUS won't be powered if INOK is active, so we need to
* manually disable INOK on some platforms.
*/
ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
if (ret < 0) {
dev_err(smb->dev, "failed to disable INOK\n");
goto done;
}
}
ret = smb347_usb_vbus_get_current_limit(rdev);
if (ret < 0) {
dev_err(smb->dev, "failed to get USB VBUS current limit\n");
goto done;
}
max_uA = ret;
ret = smb347_usb_vbus_set_new_current_limit(smb, 250000);
if (ret < 0) {
dev_err(smb->dev, "failed to preset USB VBUS current limit\n");
goto done;
}
ret = regmap_set_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
if (ret < 0) {
dev_err(smb->dev, "failed to enable USB VBUS\n");
goto done;
}
smb->usb_vbus_enabled = true;
ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
if (ret < 0) {
dev_err(smb->dev, "failed to restore USB VBUS current limit\n");
goto done;
}
done:
smb347_set_writable(smb, false, true);
return ret;
}
static int smb347_usb_vbus_regulator_disable(struct regulator_dev *rdev)
{
struct smb347_charger *smb = rdev_get_drvdata(rdev);
int ret;
ret = smb347_set_writable(smb, true, true);
if (ret < 0)
return ret;
ret = regmap_clear_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
if (ret < 0) {
dev_err(smb->dev, "failed to disable USB VBUS\n");
goto done;
}
smb->usb_vbus_enabled = false;
if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
unsigned int sysok = 0;
if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_HIGH)
sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;
ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
if (ret < 0) {
dev_err(smb->dev, "failed to enable INOK\n");
goto done;
}
}
smb347_start_stop_charging(smb);
done:
smb347_set_writable(smb, false, true);
return ret;
}
static const struct regmap_config smb347_regmap = {
.reg_bits = 8,
.val_bits = 8,
@ -1314,6 +1492,14 @@ static const struct regmap_config smb347_regmap = {
.num_reg_defaults_raw = SMB347_MAX_REGISTER,
};
static const struct regulator_ops smb347_usb_vbus_regulator_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = smb347_usb_vbus_regulator_enable,
.disable = smb347_usb_vbus_regulator_disable,
.get_current_limit = smb347_usb_vbus_get_current_limit,
.set_current_limit = smb347_usb_vbus_set_current_limit,
};
static const struct power_supply_desc smb347_mains_desc = {
.name = "smb347-mains",
.type = POWER_SUPPLY_TYPE_MAINS,
@ -1330,10 +1516,24 @@ static const struct power_supply_desc smb347_usb_desc = {
.num_properties = ARRAY_SIZE(smb347_properties),
};
static const struct regulator_desc smb347_usb_vbus_regulator_desc = {
.name = "smb347-usb-vbus",
.of_match = of_match_ptr("usb-vbus"),
.ops = &smb347_usb_vbus_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = CMD_A,
.enable_mask = CMD_A_OTG_ENABLED,
.enable_val = CMD_A_OTG_ENABLED,
.fixed_uV = 5000000,
.n_voltages = 1,
};
static int smb347_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct power_supply_config mains_usb_cfg = {};
struct regulator_config usb_rdev_cfg = {};
struct device *dev = &client->dev;
struct smb347_charger *smb;
int ret;
@ -1381,6 +1581,18 @@ static int smb347_probe(struct i2c_client *client,
if (ret)
return ret;
usb_rdev_cfg.dev = dev;
usb_rdev_cfg.driver_data = smb;
usb_rdev_cfg.regmap = smb->regmap;
smb->usb_rdev = devm_regulator_register(dev,
&smb347_usb_vbus_regulator_desc,
&usb_rdev_cfg);
if (IS_ERR(smb->usb_rdev)) {
smb347_irq_disable(smb);
return PTR_ERR(smb->usb_rdev);
}
return 0;
}
@ -1388,11 +1600,17 @@ static int smb347_remove(struct i2c_client *client)
{
struct smb347_charger *smb = i2c_get_clientdata(client);
smb347_usb_vbus_regulator_disable(smb->usb_rdev);
smb347_irq_disable(smb);
return 0;
}
static void smb347_shutdown(struct i2c_client *client)
{
smb347_remove(client);
}
static const struct i2c_device_id smb347_id[] = {
{ "smb345", SMB345 },
{ "smb347", SMB347 },
@ -1416,6 +1634,7 @@ static struct i2c_driver smb347_driver = {
},
.probe = smb347_probe,
.remove = smb347_remove,
.shutdown = smb347_shutdown,
.id_table = smb347_id,
};
module_i2c_driver(smb347_driver);