| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Bartosz Golaszewski | 1385 | 100.00% | 3 | 100.00% |
| Total | 1385 | 3 |
// SPDX-License-Identifier: GPL-2.0 // // Copyright (C) 2018 BayLibre SAS // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com> // // Battery charger driver for MAXIM 77650/77651 charger/power-supply. #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/mfd/max77650.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/regmap.h> #define MAX77650_CHARGER_ENABLED BIT(0) #define MAX77650_CHARGER_DISABLED 0x00 #define MAX77650_CHARGER_CHG_EN_MASK BIT(0) #define MAX77650_CHG_DETAILS_MASK GENMASK(7, 4) #define MAX77650_CHG_DETAILS_BITS(_reg) \ (((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4) /* Charger is OFF. */ #define MAX77650_CHG_OFF 0x00 /* Charger is in prequalification mode. */ #define MAX77650_CHG_PREQ 0x01 /* Charger is in fast-charge constant current mode. */ #define MAX77650_CHG_ON_CURR 0x02 /* Charger is in JEITA modified fast-charge constant-current mode. */ #define MAX77650_CHG_ON_CURR_JEITA 0x03 /* Charger is in fast-charge constant-voltage mode. */ #define MAX77650_CHG_ON_VOLT 0x04 /* Charger is in JEITA modified fast-charge constant-voltage mode. */ #define MAX77650_CHG_ON_VOLT_JEITA 0x05 /* Charger is in top-off mode. */ #define MAX77650_CHG_ON_TOPOFF 0x06 /* Charger is in JEITA modified top-off mode. */ #define MAX77650_CHG_ON_TOPOFF_JEITA 0x07 /* Charger is done. */ #define MAX77650_CHG_DONE 0x08 /* Charger is JEITA modified done. */ #define MAX77650_CHG_DONE_JEITA 0x09 /* Charger is suspended due to a prequalification timer fault. */ #define MAX77650_CHG_SUSP_PREQ_TIM_FAULT 0x0a /* Charger is suspended due to a fast-charge timer fault. */ #define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT 0x0b /* Charger is suspended due to a battery temperature fault. */ #define MAX77650_CHG_SUSP_BATT_TEMP_FAULT 0x0c #define MAX77650_CHGIN_DETAILS_MASK GENMASK(3, 2) #define MAX77650_CHGIN_DETAILS_BITS(_reg) \ (((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2) #define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT 0x00 #define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT 0x01 #define MAX77650_CHGIN_OKAY 0x11 #define MAX77650_CHARGER_CHG_MASK BIT(1) #define MAX77650_CHARGER_CHG_CHARGING(_reg) \ (((_reg) & MAX77650_CHARGER_CHG_MASK) > 1) #define MAX77650_CHARGER_VCHGIN_MIN_MASK 0xc0 #define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val) ((_val) << 5) #define MAX77650_CHARGER_ICHGIN_LIM_MASK 0x1c #define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val) ((_val) << 2) struct max77650_charger_data { struct regmap *map; struct device *dev; }; static enum power_supply_property max77650_charger_properties[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_CHARGE_TYPE }; static const unsigned int max77650_charger_vchgin_min_table[] = { 4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000 }; static const unsigned int max77650_charger_ichgin_lim_table[] = { 95000, 190000, 285000, 380000, 475000 }; static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg, unsigned int val) { int i, rv; for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) { if (val == max77650_charger_vchgin_min_table[i]) { rv = regmap_update_bits(chg->map, MAX77650_REG_CNFG_CHG_B, MAX77650_CHARGER_VCHGIN_MIN_MASK, MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i)); if (rv) return rv; return 0; } } return -EINVAL; } static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg, unsigned int val) { int i, rv; for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) { if (val == max77650_charger_ichgin_lim_table[i]) { rv = regmap_update_bits(chg->map, MAX77650_REG_CNFG_CHG_B, MAX77650_CHARGER_ICHGIN_LIM_MASK, MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i)); if (rv) return rv; return 0; } } return -EINVAL; } static int max77650_charger_enable(struct max77650_charger_data *chg) { int rv; rv = regmap_update_bits(chg->map, MAX77650_REG_CNFG_CHG_B, MAX77650_CHARGER_CHG_EN_MASK, MAX77650_CHARGER_ENABLED); if (rv) dev_err(chg->dev, "unable to enable the charger: %d\n", rv); return rv; } static int max77650_charger_disable(struct max77650_charger_data *chg) { int rv; rv = regmap_update_bits(chg->map, MAX77650_REG_CNFG_CHG_B, MAX77650_CHARGER_CHG_EN_MASK, MAX77650_CHARGER_DISABLED); if (rv) dev_err(chg->dev, "unable to disable the charger: %d\n", rv); return rv; } static irqreturn_t max77650_charger_check_status(int irq, void *data) { struct max77650_charger_data *chg = data; int rv, reg; rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®); if (rv) { dev_err(chg->dev, "unable to read the charger status: %d\n", rv); return IRQ_HANDLED; } switch (MAX77650_CHGIN_DETAILS_BITS(reg)) { case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT: dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n"); max77650_charger_disable(chg); break; case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT: dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n"); max77650_charger_disable(chg); break; case MAX77650_CHGIN_OKAY: max77650_charger_enable(chg); break; default: /* May be 0x10 - debouncing */ break; } return IRQ_HANDLED; } static int max77650_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max77650_charger_data *chg = power_supply_get_drvdata(psy); int rv, reg; switch (psp) { case POWER_SUPPLY_PROP_STATUS: rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®); if (rv) return rv; if (MAX77650_CHARGER_CHG_CHARGING(reg)) { val->intval = POWER_SUPPLY_STATUS_CHARGING; break; } switch (MAX77650_CHG_DETAILS_BITS(reg)) { case MAX77650_CHG_OFF: case MAX77650_CHG_SUSP_PREQ_TIM_FAULT: case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT: case MAX77650_CHG_SUSP_BATT_TEMP_FAULT: val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; break; case MAX77650_CHG_PREQ: case MAX77650_CHG_ON_CURR: case MAX77650_CHG_ON_CURR_JEITA: case MAX77650_CHG_ON_VOLT: case MAX77650_CHG_ON_VOLT_JEITA: case MAX77650_CHG_ON_TOPOFF: case MAX77650_CHG_ON_TOPOFF_JEITA: val->intval = POWER_SUPPLY_STATUS_CHARGING; break; case MAX77650_CHG_DONE: val->intval = POWER_SUPPLY_STATUS_FULL; break; default: val->intval = POWER_SUPPLY_STATUS_UNKNOWN; } break; case POWER_SUPPLY_PROP_ONLINE: rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®); if (rv) return rv; val->intval = MAX77650_CHARGER_CHG_CHARGING(reg); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®); if (rv) return rv; if (!MAX77650_CHARGER_CHG_CHARGING(reg)) { val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; break; } switch (MAX77650_CHG_DETAILS_BITS(reg)) { case MAX77650_CHG_PREQ: case MAX77650_CHG_ON_CURR: case MAX77650_CHG_ON_CURR_JEITA: case MAX77650_CHG_ON_VOLT: case MAX77650_CHG_ON_VOLT_JEITA: val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; break; case MAX77650_CHG_ON_TOPOFF: case MAX77650_CHG_ON_TOPOFF_JEITA: val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; break; default: val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; } break; default: return -EINVAL; } return 0; } static const struct power_supply_desc max77650_battery_desc = { .name = "max77650", .type = POWER_SUPPLY_TYPE_USB, .get_property = max77650_charger_get_property, .properties = max77650_charger_properties, .num_properties = ARRAY_SIZE(max77650_charger_properties), }; static int max77650_charger_probe(struct platform_device *pdev) { struct power_supply_config pscfg = {}; struct max77650_charger_data *chg; struct power_supply *battery; struct device *dev, *parent; int rv, chg_irq, chgin_irq; unsigned int prop; dev = &pdev->dev; parent = dev->parent; chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL); if (!chg) return -ENOMEM; platform_set_drvdata(pdev, chg); chg->map = dev_get_regmap(parent, NULL); if (!chg->map) return -ENODEV; chg->dev = dev; pscfg.of_node = dev->of_node; pscfg.drv_data = chg; chg_irq = platform_get_irq_byname(pdev, "CHG"); if (chg_irq < 0) return chg_irq; chgin_irq = platform_get_irq_byname(pdev, "CHGIN"); if (chgin_irq < 0) return chgin_irq; rv = devm_request_any_context_irq(dev, chg_irq, max77650_charger_check_status, IRQF_ONESHOT, "chg", chg); if (rv < 0) return rv; rv = devm_request_any_context_irq(dev, chgin_irq, max77650_charger_check_status, IRQF_ONESHOT, "chgin", chg); if (rv < 0) return rv; battery = devm_power_supply_register(dev, &max77650_battery_desc, &pscfg); if (IS_ERR(battery)) return PTR_ERR(battery); rv = of_property_read_u32(dev->of_node, "input-voltage-min-microvolt", &prop); if (rv == 0) { rv = max77650_charger_set_vchgin_min(chg, prop); if (rv) return rv; } rv = of_property_read_u32(dev->of_node, "input-current-limit-microamp", &prop); if (rv == 0) { rv = max77650_charger_set_ichgin_lim(chg, prop); if (rv) return rv; } return max77650_charger_enable(chg); } static int max77650_charger_remove(struct platform_device *pdev) { struct max77650_charger_data *chg = platform_get_drvdata(pdev); return max77650_charger_disable(chg); } static const struct of_device_id max77650_charger_of_match[] = { { .compatible = "maxim,max77650-charger" }, { } }; MODULE_DEVICE_TABLE(of, max77650_charger_of_match); static struct platform_driver max77650_charger_driver = { .driver = { .name = "max77650-charger", .of_match_table = max77650_charger_of_match, }, .probe = max77650_charger_probe, .remove = max77650_charger_remove, }; module_platform_driver(max77650_charger_driver); MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver"); MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:max77650-charger");
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