diff options
Diffstat (limited to 'drivers/power/supply/smb347-charger.c')
| -rw-r--r-- | drivers/power/supply/smb347-charger.c | 271 |
1 files changed, 252 insertions, 19 deletions
diff --git a/drivers/power/supply/smb347-charger.c b/drivers/power/supply/smb347-charger.c index df240420f2de..753944e774c4 100644 --- a/drivers/power/supply/smb347-charger.c +++ b/drivers/power/supply/smb347-charger.c @@ -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> @@ -55,6 +56,7 @@ #define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60 #define CFG_PIN_EN_APSD_IRQ BIT(1) #define CFG_PIN_EN_CHARGER_ERROR BIT(2) +#define CFG_PIN_EN_CTRL BIT(4) #define CFG_THERM 0x07 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0 @@ -62,12 +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 @@ -91,6 +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 @@ -132,11 +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 - * @charging_enabled: is charging enabled * @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 @@ -189,11 +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 charging_enabled; bool irq_unsupported; + bool usb_vbus_enabled; unsigned int max_charge_current; unsigned int max_charge_voltage; @@ -214,6 +224,7 @@ struct smb347_charger { bool use_usb; bool use_usb_otg; unsigned int enable_control; + unsigned int inok_polarity; }; enum smb_charger_chipid { @@ -358,21 +369,18 @@ static int smb347_charging_status(struct smb347_charger *smb) static int smb347_charging_set(struct smb347_charger *smb, bool enable) { - int ret = 0; - if (smb->enable_control != SMB3XX_CHG_ENABLE_SW) { dev_dbg(smb->dev, "charging enable/disable in SW disabled\n"); return 0; } - if (smb->charging_enabled != enable) { - ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED, - enable ? CMD_A_CHG_ENABLED : 0); - if (!ret) - smb->charging_enabled = enable; + if (enable && smb->usb_vbus_enabled) { + dev_dbg(smb->dev, "charging not enabled because USB is in host mode\n"); + return 0; } - return ret; + return regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED, + enable ? CMD_A_CHG_ENABLED : 0); } static inline int smb347_charging_enable(struct smb347_charger *smb) @@ -671,10 +679,22 @@ static int smb347_set_temp_limits(struct smb347_charger *smb) * * Returns %0 on success and negative errno in case of failure. */ -static int smb347_set_writable(struct smb347_charger *smb, bool writable) +static int smb347_set_writable(struct smb347_charger *smb, bool writable, + bool irq_toggle) { - return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE, - writable ? CMD_A_ALLOW_WRITE : 0); + struct i2c_client *client = to_i2c_client(smb->dev); + int ret; + + if (writable && irq_toggle && !smb->irq_unsupported) + disable_irq(client->irq); + + ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE, + writable ? CMD_A_ALLOW_WRITE : 0); + + if ((!writable || ret) && irq_toggle && !smb->irq_unsupported) + enable_irq(client->irq); + + return ret; } static int smb347_hw_init(struct smb347_charger *smb) @@ -682,7 +702,7 @@ static int smb347_hw_init(struct smb347_charger *smb) unsigned int val; int ret; - ret = smb347_set_writable(smb, true); + ret = smb347_set_writable(smb, true, false); if (ret < 0) return ret; @@ -724,6 +744,15 @@ static int smb347_hw_init(struct smb347_charger *smb) if (ret < 0) goto fail; + /* Activate pin control, making it writable. */ + switch (smb->enable_control) { + case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW: + case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH: + ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL); + if (ret < 0) + goto fail; + } + /* * Make the charging functionality controllable by a write to the * command register unless pin control is specified in the platform @@ -758,7 +787,7 @@ static int smb347_hw_init(struct smb347_charger *smb) ret = smb347_start_stop_charging(smb); fail: - smb347_set_writable(smb, false); + smb347_set_writable(smb, false, false); return ret; } @@ -866,7 +895,7 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable) if (smb->irq_unsupported) return 0; - ret = smb347_set_writable(smb, true); + ret = smb347_set_writable(smb, true, true); if (ret < 0) return ret; @@ -891,7 +920,7 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable) ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR, enable ? CFG_PIN_EN_CHARGER_ERROR : 0); fail: - smb347_set_writable(smb, false); + smb347_set_writable(smb, false, true); return ret; } @@ -919,7 +948,7 @@ static int smb347_irq_init(struct smb347_charger *smb, if (!client->irq) return 0; - ret = smb347_set_writable(smb, true); + ret = smb347_set_writable(smb, true, false); if (ret < 0) return ret; @@ -931,7 +960,7 @@ static int smb347_irq_init(struct smb347_charger *smb, CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED, CFG_STAT_DISABLED); - smb347_set_writable(smb, false); + smb347_set_writable(smb, false, false); if (ret < 0) { dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret); @@ -1241,6 +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) @@ -1292,12 +1328,176 @@ 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, .max_register = SMB347_MAX_REGISTER, .volatile_reg = smb347_volatile_reg, .readable_reg = smb347_readable_reg, + .cache_type = REGCACHE_FLAT, + .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 = { @@ -1316,10 +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; @@ -1367,6 +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; } @@ -1374,11 +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 }, @@ -1402,6 +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); |