| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Kim (Woogyom) Milo | 2867 | 93.57% | 7 | 38.89% |
| Sebastian Reichel | 117 | 3.82% | 1 | 5.56% |
| Krzysztof Kozlowski | 51 | 1.66% | 2 | 11.11% |
| Colin Ian King | 15 | 0.49% | 2 | 11.11% |
| Guenter Roeck | 7 | 0.23% | 1 | 5.56% |
| Thomas Gleixner | 2 | 0.07% | 1 | 5.56% |
| Christophe Jaillet | 2 | 0.07% | 1 | 5.56% |
| Julia Lawall | 1 | 0.03% | 1 | 5.56% |
| Giedrius Statkevičius | 1 | 0.03% | 1 | 5.56% |
| dongjian | 1 | 0.03% | 1 | 5.56% |
| Total | 3064 | 18 |
// SPDX-License-Identifier: GPL-2.0-only /* * TI LP8788 MFD - battery charger driver * * Copyright 2012 Texas Instruments * * Author: Milo(Woogyom) Kim <milo.kim@ti.com> */ #include <linux/err.h> #include <linux/iio/consumer.h> #include <linux/interrupt.h> #include <linux/irqdomain.h> #include <linux/mfd/lp8788.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/slab.h> #include <linux/workqueue.h> /* register address */ #define LP8788_CHG_STATUS 0x07 #define LP8788_CHG_IDCIN 0x13 #define LP8788_CHG_IBATT 0x14 #define LP8788_CHG_VTERM 0x15 #define LP8788_CHG_EOC 0x16 /* mask/shift bits */ #define LP8788_CHG_INPUT_STATE_M 0x03 /* Addr 07h */ #define LP8788_CHG_STATE_M 0x3C #define LP8788_CHG_STATE_S 2 #define LP8788_NO_BATT_M BIT(6) #define LP8788_BAD_BATT_M BIT(7) #define LP8788_CHG_IBATT_M 0x1F /* Addr 14h */ #define LP8788_CHG_VTERM_M 0x0F /* Addr 15h */ #define LP8788_CHG_EOC_LEVEL_M 0x30 /* Addr 16h */ #define LP8788_CHG_EOC_LEVEL_S 4 #define LP8788_CHG_EOC_TIME_M 0x0E #define LP8788_CHG_EOC_TIME_S 1 #define LP8788_CHG_EOC_MODE_M BIT(0) #define LP8788_CHARGER_NAME "charger" #define LP8788_BATTERY_NAME "main_batt" #define LP8788_CHG_START 0x11 #define LP8788_CHG_END 0x1C #define LP8788_ISEL_MAX 23 #define LP8788_ISEL_STEP 50 #define LP8788_VTERM_MIN 4100 #define LP8788_VTERM_STEP 25 #define LP8788_MAX_BATT_CAPACITY 100 #define LP8788_MAX_CHG_IRQS 11 enum lp8788_charging_state { LP8788_OFF, LP8788_WARM_UP, LP8788_LOW_INPUT = 0x3, LP8788_PRECHARGE, LP8788_CC, LP8788_CV, LP8788_MAINTENANCE, LP8788_BATTERY_FAULT, LP8788_SYSTEM_SUPPORT = 0xC, LP8788_HIGH_CURRENT = 0xF, LP8788_MAX_CHG_STATE, }; enum lp8788_charger_adc_sel { LP8788_VBATT, LP8788_BATT_TEMP, LP8788_NUM_CHG_ADC, }; enum lp8788_charger_input_state { LP8788_SYSTEM_SUPPLY = 1, LP8788_FULL_FUNCTION, }; /* * struct lp8788_chg_irq * @which : lp8788 interrupt id * @virq : Linux IRQ number from irq_domain */ struct lp8788_chg_irq { enum lp8788_int_id which; int virq; }; /* * struct lp8788_charger * @lp : used for accessing the registers of mfd lp8788 device * @charger : power supply driver for the battery charger * @battery : power supply driver for the battery * @charger_work : work queue for charger input interrupts * @chan : iio channels for getting adc values * eg) battery voltage, capacity and temperature * @irqs : charger dedicated interrupts * @num_irqs : total numbers of charger interrupts * @pdata : charger platform specific data */ struct lp8788_charger { struct lp8788 *lp; struct power_supply *charger; struct power_supply *battery; struct work_struct charger_work; struct iio_channel *chan[LP8788_NUM_CHG_ADC]; struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS]; int num_irqs; struct lp8788_charger_platform_data *pdata; }; static char *battery_supplied_to[] = { LP8788_BATTERY_NAME, }; static enum power_supply_property lp8788_charger_prop[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_CURRENT_MAX, }; static enum power_supply_property lp8788_battery_prop[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, POWER_SUPPLY_PROP_TEMP, }; static bool lp8788_is_charger_detected(struct lp8788_charger *pchg) { u8 data; lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); data &= LP8788_CHG_INPUT_STATE_M; return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION; } static int lp8788_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent); u8 read; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = lp8788_is_charger_detected(pchg); break; case POWER_SUPPLY_PROP_CURRENT_MAX: lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read); val->intval = LP8788_ISEL_STEP * (min_t(int, read, LP8788_ISEL_MAX) + 1); break; default: return -EINVAL; } return 0; } static int lp8788_get_battery_status(struct lp8788_charger *pchg, union power_supply_propval *val) { enum lp8788_charging_state state; u8 data; int ret; ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); if (ret) return ret; state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; switch (state) { case LP8788_OFF: val->intval = POWER_SUPPLY_STATUS_DISCHARGING; break; case LP8788_PRECHARGE: case LP8788_CC: case LP8788_CV: case LP8788_HIGH_CURRENT: val->intval = POWER_SUPPLY_STATUS_CHARGING; break; case LP8788_MAINTENANCE: val->intval = POWER_SUPPLY_STATUS_FULL; break; default: val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; break; } return 0; } static int lp8788_get_battery_health(struct lp8788_charger *pchg, union power_supply_propval *val) { u8 data; int ret; ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); if (ret) return ret; if (data & LP8788_NO_BATT_M) val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; else if (data & LP8788_BAD_BATT_M) val->intval = POWER_SUPPLY_HEALTH_DEAD; else val->intval = POWER_SUPPLY_HEALTH_GOOD; return 0; } static int lp8788_get_battery_present(struct lp8788_charger *pchg, union power_supply_propval *val) { u8 data; int ret; ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); if (ret) return ret; val->intval = !(data & LP8788_NO_BATT_M); return 0; } static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result) { struct iio_channel *channel = pchg->chan[LP8788_VBATT]; if (!channel) return -EINVAL; return iio_read_channel_processed(channel, result); } static int lp8788_get_battery_voltage(struct lp8788_charger *pchg, union power_supply_propval *val) { return lp8788_get_vbatt_adc(pchg, &val->intval); } static int lp8788_get_battery_capacity(struct lp8788_charger *pchg, union power_supply_propval *val) { struct lp8788 *lp = pchg->lp; struct lp8788_charger_platform_data *pdata = pchg->pdata; unsigned int max_vbatt; int vbatt; enum lp8788_charging_state state; u8 data; int ret; if (!pdata) return -EINVAL; max_vbatt = pdata->max_vbatt_mv; if (max_vbatt == 0) return -EINVAL; ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data); if (ret) return ret; state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; if (state == LP8788_MAINTENANCE) { val->intval = LP8788_MAX_BATT_CAPACITY; } else { ret = lp8788_get_vbatt_adc(pchg, &vbatt); if (ret) return ret; val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt; val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY); } return 0; } static int lp8788_get_battery_temperature(struct lp8788_charger *pchg, union power_supply_propval *val) { struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP]; int result; int ret; if (!channel) return -EINVAL; ret = iio_read_channel_processed(channel, &result); if (ret < 0) return -EINVAL; /* unit: 0.1 'C */ val->intval = result * 10; return 0; } static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg, union power_supply_propval *val) { u8 read; lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read); read &= LP8788_CHG_IBATT_M; val->intval = LP8788_ISEL_STEP * (min_t(int, read, LP8788_ISEL_MAX) + 1); return 0; } static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg, union power_supply_propval *val) { u8 read; lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read); read &= LP8788_CHG_VTERM_M; val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read; return 0; } static int lp8788_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent); switch (psp) { case POWER_SUPPLY_PROP_STATUS: return lp8788_get_battery_status(pchg, val); case POWER_SUPPLY_PROP_HEALTH: return lp8788_get_battery_health(pchg, val); case POWER_SUPPLY_PROP_PRESENT: return lp8788_get_battery_present(pchg, val); case POWER_SUPPLY_PROP_VOLTAGE_NOW: return lp8788_get_battery_voltage(pchg, val); case POWER_SUPPLY_PROP_CAPACITY: return lp8788_get_battery_capacity(pchg, val); case POWER_SUPPLY_PROP_TEMP: return lp8788_get_battery_temperature(pchg, val); case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: return lp8788_get_battery_charging_current(pchg, val); case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: return lp8788_get_charging_termination_voltage(pchg, val); default: return -EINVAL; } } static inline bool lp8788_is_valid_charger_register(u8 addr) { return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END; } static int lp8788_update_charger_params(struct platform_device *pdev, struct lp8788_charger *pchg) { struct lp8788 *lp = pchg->lp; struct lp8788_charger_platform_data *pdata = pchg->pdata; struct lp8788_chg_param *param; int i; int ret; if (!pdata || !pdata->chg_params) { dev_info(&pdev->dev, "skip updating charger parameters\n"); return 0; } /* setting charging parameters */ for (i = 0; i < pdata->num_chg_params; i++) { param = pdata->chg_params + i; if (lp8788_is_valid_charger_register(param->addr)) { ret = lp8788_write_byte(lp, param->addr, param->val); if (ret) return ret; } } return 0; } static const struct power_supply_desc lp8788_psy_charger_desc = { .name = LP8788_CHARGER_NAME, .type = POWER_SUPPLY_TYPE_MAINS, .properties = lp8788_charger_prop, .num_properties = ARRAY_SIZE(lp8788_charger_prop), .get_property = lp8788_charger_get_property, }; static const struct power_supply_desc lp8788_psy_battery_desc = { .name = LP8788_BATTERY_NAME, .type = POWER_SUPPLY_TYPE_BATTERY, .properties = lp8788_battery_prop, .num_properties = ARRAY_SIZE(lp8788_battery_prop), .get_property = lp8788_battery_get_property, }; static void lp8788_psy_unregister(struct lp8788_charger *pchg) { power_supply_unregister(pchg->battery); power_supply_unregister(pchg->charger); } static void lp8788_charger_event(struct work_struct *work) { struct lp8788_charger *pchg = container_of(work, struct lp8788_charger, charger_work); struct lp8788_charger_platform_data *pdata = pchg->pdata; enum lp8788_charger_event event = lp8788_is_charger_detected(pchg); pdata->charger_event(pchg->lp, event); } static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id) { bool found = false; int i; for (i = 0; i < pchg->num_irqs; i++) { if (pchg->irqs[i].virq == virq) { *id = pchg->irqs[i].which; found = true; break; } } return found; } static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr) { struct lp8788_charger *pchg = ptr; struct lp8788_charger_platform_data *pdata = pchg->pdata; int id = -1; if (!lp8788_find_irq_id(pchg, virq, &id)) return IRQ_NONE; switch (id) { case LP8788_INT_CHG_INPUT_STATE: case LP8788_INT_CHG_STATE: case LP8788_INT_EOC: case LP8788_INT_BATT_LOW: case LP8788_INT_NO_BATT: power_supply_changed(pchg->charger); power_supply_changed(pchg->battery); break; default: break; } /* report charger dectection event if used */ if (!pdata) goto irq_handled; if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE) schedule_work(&pchg->charger_work); irq_handled: return IRQ_HANDLED; } static int lp8788_set_irqs(struct platform_device *pdev, struct lp8788_charger *pchg, const char *name) { struct resource *r; struct irq_domain *irqdm = pchg->lp->irqdm; int irq_start; int irq_end; int virq; int nr_irq; int i; int ret; /* no error even if no irq resource */ r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name); if (!r) return 0; irq_start = r->start; irq_end = r->end; for (i = irq_start; i <= irq_end; i++) { nr_irq = pchg->num_irqs; virq = irq_create_mapping(irqdm, i); pchg->irqs[nr_irq].virq = virq; pchg->irqs[nr_irq].which = i; pchg->num_irqs++; ret = request_threaded_irq(virq, NULL, lp8788_charger_irq_thread, IRQF_ONESHOT, name, pchg); if (ret) break; } if (i <= irq_end) goto err_free_irq; return 0; err_free_irq: for (i = 0; i < pchg->num_irqs; i++) free_irq(pchg->irqs[i].virq, pchg); return ret; } static int lp8788_irq_register(struct platform_device *pdev, struct lp8788_charger *pchg) { const char *name[] = { LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ }; int i; int ret; INIT_WORK(&pchg->charger_work, lp8788_charger_event); pchg->num_irqs = 0; for (i = 0; i < ARRAY_SIZE(name); i++) { ret = lp8788_set_irqs(pdev, pchg, name[i]); if (ret) { dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]); return ret; } } if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) { dev_err(&pdev->dev, "invalid total number of irqs: %d\n", pchg->num_irqs); return -EINVAL; } return 0; } static void lp8788_irq_unregister(struct platform_device *pdev, struct lp8788_charger *pchg) { int i; int irq; for (i = 0; i < pchg->num_irqs; i++) { irq = pchg->irqs[i].virq; if (!irq) continue; free_irq(irq, pchg); } } static void lp8788_setup_adc_channel(struct device *dev, struct lp8788_charger *pchg) { struct lp8788_charger_platform_data *pdata = pchg->pdata; struct iio_channel *chan; if (!pdata) return; /* ADC channel for battery voltage */ chan = devm_iio_channel_get(dev, pdata->adc_vbatt); pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan; /* ADC channel for battery temperature */ chan = devm_iio_channel_get(dev, pdata->adc_batt_temp); pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan; } static ssize_t lp8788_show_charger_status(struct device *dev, struct device_attribute *attr, char *buf) { struct lp8788_charger *pchg = dev_get_drvdata(dev); enum lp8788_charging_state state; static const char * const desc[LP8788_MAX_CHG_STATE] = { [LP8788_OFF] = "CHARGER OFF", [LP8788_WARM_UP] = "WARM UP", [LP8788_LOW_INPUT] = "LOW INPUT STATE", [LP8788_PRECHARGE] = "CHARGING - PRECHARGE", [LP8788_CC] = "CHARGING - CC", [LP8788_CV] = "CHARGING - CV", [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE", [LP8788_BATTERY_FAULT] = "BATTERY FAULT", [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT", [LP8788_HIGH_CURRENT] = "HIGH CURRENT", }; u8 data; lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]); } static ssize_t lp8788_show_eoc_time(struct device *dev, struct device_attribute *attr, char *buf) { struct lp8788_charger *pchg = dev_get_drvdata(dev); static const char * const stime[] = { "400ms", "5min", "10min", "15min", "20min", "25min", "30min", "No timeout" }; u8 val; lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val); val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S; return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n", stime[val]); } static ssize_t lp8788_show_eoc_level(struct device *dev, struct device_attribute *attr, char *buf) { struct lp8788_charger *pchg = dev_get_drvdata(dev); static const char * const abs_level[] = { "25mA", "49mA", "75mA", "98mA" }; static const char * const relative_level[] = { "5%", "10%", "15%", "20%" }; const char *level; u8 val; u8 mode; lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val); mode = val & LP8788_CHG_EOC_MODE_M; val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S; level = mode ? abs_level[val] : relative_level[val]; return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level); } static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL); static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL); static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL); static struct attribute *lp8788_charger_sysfs_attrs[] = { &dev_attr_charger_status.attr, &dev_attr_eoc_time.attr, &dev_attr_eoc_level.attr, NULL, }; ATTRIBUTE_GROUPS(lp8788_charger_sysfs); static int lp8788_psy_register(struct platform_device *pdev, struct lp8788_charger *pchg) { struct power_supply_config charger_cfg = {}; charger_cfg.attr_grp = lp8788_charger_sysfs_groups; charger_cfg.supplied_to = battery_supplied_to; charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to); pchg->charger = power_supply_register(&pdev->dev, &lp8788_psy_charger_desc, &charger_cfg); if (IS_ERR(pchg->charger)) return -EPERM; pchg->battery = power_supply_register(&pdev->dev, &lp8788_psy_battery_desc, NULL); if (IS_ERR(pchg->battery)) { power_supply_unregister(pchg->charger); return -EPERM; } return 0; } static int lp8788_charger_probe(struct platform_device *pdev) { struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); struct lp8788_charger *pchg; struct device *dev = &pdev->dev; int ret; pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL); if (!pchg) return -ENOMEM; pchg->lp = lp; pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL; platform_set_drvdata(pdev, pchg); ret = lp8788_update_charger_params(pdev, pchg); if (ret) return ret; lp8788_setup_adc_channel(&pdev->dev, pchg); ret = lp8788_psy_register(pdev, pchg); if (ret) return ret; ret = lp8788_irq_register(pdev, pchg); if (ret) dev_warn(dev, "failed to register charger irq: %d\n", ret); return 0; } static int lp8788_charger_remove(struct platform_device *pdev) { struct lp8788_charger *pchg = platform_get_drvdata(pdev); flush_work(&pchg->charger_work); lp8788_irq_unregister(pdev, pchg); lp8788_psy_unregister(pchg); return 0; } static struct platform_driver lp8788_charger_driver = { .probe = lp8788_charger_probe, .remove = lp8788_charger_remove, .driver = { .name = LP8788_DEV_CHARGER, }, }; module_platform_driver(lp8788_charger_driver); MODULE_DESCRIPTION("TI LP8788 Charger Driver"); MODULE_AUTHOR("Milo Kim"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:lp8788-charger");
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