/* * Driver for LP8727 Micro/Mini USB IC with integrated charger * * Copyright (C) 2011 Texas Instruments * Copyright (C) 2011 National Semiconductor * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/module.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/i2c.h> #include <linux/power_supply.h> #include <linux/platform_data/lp8727.h> #include <linux/of.h> #define LP8788_NUM_INTREGS 2 #define DEFAULT_DEBOUNCE_MSEC 270 /* Registers */ #define LP8727_CTRL1 0x1 #define LP8727_CTRL2 0x2 #define LP8727_SWCTRL 0x3 #define LP8727_INT1 0x4 #define LP8727_INT2 0x5 #define LP8727_STATUS1 0x6 #define LP8727_STATUS2 0x7 #define LP8727_CHGCTRL2 0x9 /* CTRL1 register */ #define LP8727_CP_EN BIT(0) #define LP8727_ADC_EN BIT(1) #define LP8727_ID200_EN BIT(4) /* CTRL2 register */ #define LP8727_CHGDET_EN BIT(1) #define LP8727_INT_EN BIT(6) /* SWCTRL register */ #define LP8727_SW_DM1_DM (0x0 << 0) #define LP8727_SW_DM1_HiZ (0x7 << 0) #define LP8727_SW_DP2_DP (0x0 << 3) #define LP8727_SW_DP2_HiZ (0x7 << 3) /* INT1 register */ #define LP8727_IDNO (0xF << 0) #define LP8727_VBUS BIT(4) /* STATUS1 register */ #define LP8727_CHGSTAT (3 << 4) #define LP8727_CHPORT BIT(6) #define LP8727_DCPORT BIT(7) #define LP8727_STAT_EOC 0x30 /* STATUS2 register */ #define LP8727_TEMP_STAT (3 << 5) #define LP8727_TEMP_SHIFT 5 /* CHGCTRL2 register */ #define LP8727_ICHG_SHIFT 4 enum lp8727_dev_id { LP8727_ID_NONE, LP8727_ID_TA, LP8727_ID_DEDICATED_CHG, LP8727_ID_USB_CHG, LP8727_ID_USB_DS, LP8727_ID_MAX, }; enum lp8727_die_temp { LP8788_TEMP_75C, LP8788_TEMP_95C, LP8788_TEMP_115C, LP8788_TEMP_135C, }; struct lp8727_psy { struct power_supply *ac; struct power_supply *usb; struct power_supply *batt; }; struct lp8727_chg { struct device *dev; struct i2c_client *client; struct mutex xfer_lock; struct lp8727_psy *psy; struct lp8727_platform_data *pdata; /* Charger Data */ enum lp8727_dev_id devid; struct lp8727_chg_param *chg_param; /* Interrupt Handling */ int irq; struct delayed_work work; unsigned long debounce_jiffies; }; static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len) { s32 ret; mutex_lock(&pchg->xfer_lock); ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data); mutex_unlock(&pchg->xfer_lock); return (ret != len) ? -EIO : 0; } static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data) { return lp8727_read_bytes(pchg, reg, data, 1); } static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data) { int ret; mutex_lock(&pchg->xfer_lock); ret = i2c_smbus_write_byte_data(pchg->client, reg, data); mutex_unlock(&pchg->xfer_lock); return ret; } static bool lp8727_is_charger_attached(const char *name, int id) { if (!strcmp(name, "ac")) return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG; else if (!strcmp(name, "usb")) return id == LP8727_ID_USB_CHG; return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG; } static int lp8727_init_device(struct lp8727_chg *pchg) { u8 val; int ret; u8 intstat[LP8788_NUM_INTREGS]; /* clear interrupts */ ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS); if (ret) return ret; val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN; ret = lp8727_write_byte(pchg, LP8727_CTRL1, val); if (ret) return ret; val = LP8727_INT_EN | LP8727_CHGDET_EN; return lp8727_write_byte(pchg, LP8727_CTRL2, val); } static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg) { u8 val; lp8727_read_byte(pchg, LP8727_STATUS1, &val); return val & LP8727_DCPORT; } static int lp8727_is_usb_charger(struct lp8727_chg *pchg) { u8 val; lp8727_read_byte(pchg, LP8727_STATUS1, &val); return val & LP8727_CHPORT; } static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw) { lp8727_write_byte(pchg, LP8727_SWCTRL, sw); } static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin) { struct lp8727_platform_data *pdata = pchg->pdata; u8 devid = LP8727_ID_NONE; u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ; switch (id) { case 0x5: devid = LP8727_ID_TA; pchg->chg_param = pdata ? pdata->ac : NULL; break; case 0xB: if (lp8727_is_dedicated_charger(pchg)) { pchg->chg_param = pdata ? pdata->ac : NULL; devid = LP8727_ID_DEDICATED_CHG; } else if (lp8727_is_usb_charger(pchg)) { pchg->chg_param = pdata ? pdata->usb : NULL; devid = LP8727_ID_USB_CHG; swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP; } else if (vbusin) { devid = LP8727_ID_USB_DS; swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP; } break; default: devid = LP8727_ID_NONE; pchg->chg_param = NULL; break; } pchg->devid = devid; lp8727_ctrl_switch(pchg, swctrl); } static void lp8727_enable_chgdet(struct lp8727_chg *pchg) { u8 val; lp8727_read_byte(pchg, LP8727_CTRL2, &val); val |= LP8727_CHGDET_EN; lp8727_write_byte(pchg, LP8727_CTRL2, val); } static void lp8727_delayed_func(struct work_struct *_work) { struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg, work.work); u8 intstat[LP8788_NUM_INTREGS]; u8 idno; u8 vbus; if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) { dev_err(pchg->dev, "can not read INT registers\n"); return; } idno = intstat[0] & LP8727_IDNO; vbus = intstat[0] & LP8727_VBUS; lp8727_id_detection(pchg, idno, vbus); lp8727_enable_chgdet(pchg); power_supply_changed(pchg->psy->ac); power_supply_changed(pchg->psy->usb); power_supply_changed(pchg->psy->batt); } static irqreturn_t lp8727_isr_func(int irq, void *ptr) { struct lp8727_chg *pchg = ptr; schedule_delayed_work(&pchg->work, pchg->debounce_jiffies); return IRQ_HANDLED; } static int lp8727_setup_irq(struct lp8727_chg *pchg) { int ret; int irq = pchg->client->irq; unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec : DEFAULT_DEBOUNCE_MSEC; INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func); if (irq <= 0) { dev_warn(pchg->dev, "invalid irq number: %d\n", irq); return 0; } ret = request_threaded_irq(irq, NULL, lp8727_isr_func, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lp8727_irq", pchg); if (ret) return ret; pchg->irq = irq; pchg->debounce_jiffies = msecs_to_jiffies(delay_msec); return 0; } static void lp8727_release_irq(struct lp8727_chg *pchg) { cancel_delayed_work_sync(&pchg->work); if (pchg->irq) free_irq(pchg->irq, pchg); } static enum power_supply_property lp8727_charger_prop[] = { POWER_SUPPLY_PROP_ONLINE, }; static enum power_supply_property lp8727_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_TEMP, }; static char *battery_supplied_to[] = { "main_batt", }; static int lp8727_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent); if (psp != POWER_SUPPLY_PROP_ONLINE) return -EINVAL; val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid); return 0; } static bool lp8727_is_high_temperature(enum lp8727_die_temp temp) { switch (temp) { case LP8788_TEMP_95C: case LP8788_TEMP_115C: case LP8788_TEMP_135C: return true; default: return false; } } static int lp8727_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent); struct lp8727_platform_data *pdata = pchg->pdata; enum lp8727_die_temp temp; u8 read; switch (psp) { case POWER_SUPPLY_PROP_STATUS: if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) { val->intval = POWER_SUPPLY_STATUS_DISCHARGING; return 0; } lp8727_read_byte(pchg, LP8727_STATUS1, &read); val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ? POWER_SUPPLY_STATUS_FULL : POWER_SUPPLY_STATUS_CHARGING; break; case POWER_SUPPLY_PROP_HEALTH: lp8727_read_byte(pchg, LP8727_STATUS2, &read); temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT; val->intval = lp8727_is_high_temperature(temp) ? POWER_SUPPLY_HEALTH_OVERHEAT : POWER_SUPPLY_HEALTH_GOOD; break; case POWER_SUPPLY_PROP_PRESENT: if (!pdata) return -EINVAL; if (pdata->get_batt_present) val->intval = pdata->get_batt_present(); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: if (!pdata) return -EINVAL; if (pdata->get_batt_level) val->intval = pdata->get_batt_level(); break; case POWER_SUPPLY_PROP_CAPACITY: if (!pdata) return -EINVAL; if (pdata->get_batt_capacity) val->intval = pdata->get_batt_capacity(); break; case POWER_SUPPLY_PROP_TEMP: if (!pdata) return -EINVAL; if (pdata->get_batt_temp) val->intval = pdata->get_batt_temp(); break; default: break; } return 0; } static void lp8727_charger_changed(struct power_supply *psy) { struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent); u8 eoc_level; u8 ichg; u8 val; /* skip if no charger exists */ if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) return; /* update charging parameters */ if (pchg->chg_param) { eoc_level = pchg->chg_param->eoc_level; ichg = pchg->chg_param->ichg; val = (ichg << LP8727_ICHG_SHIFT) | eoc_level; lp8727_write_byte(pchg, LP8727_CHGCTRL2, val); } } static const struct power_supply_desc lp8727_ac_desc = { .name = "ac", .type = POWER_SUPPLY_TYPE_MAINS, .properties = lp8727_charger_prop, .num_properties = ARRAY_SIZE(lp8727_charger_prop), .get_property = lp8727_charger_get_property, }; static const struct power_supply_desc lp8727_usb_desc = { .name = "usb", .type = POWER_SUPPLY_TYPE_USB, .properties = lp8727_charger_prop, .num_properties = ARRAY_SIZE(lp8727_charger_prop), .get_property = lp8727_charger_get_property, }; static const struct power_supply_desc lp8727_batt_desc = { .name = "main_batt", .type = POWER_SUPPLY_TYPE_BATTERY, .properties = lp8727_battery_prop, .num_properties = ARRAY_SIZE(lp8727_battery_prop), .get_property = lp8727_battery_get_property, .external_power_changed = lp8727_charger_changed, }; static int lp8727_register_psy(struct lp8727_chg *pchg) { struct power_supply_config psy_cfg = {}; /* Only for ac and usb */ struct lp8727_psy *psy; psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL); if (!psy) return -ENOMEM; pchg->psy = psy; psy_cfg.supplied_to = battery_supplied_to; psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to); psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg); if (IS_ERR(psy->ac)) goto err_psy_ac; psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc, &psy_cfg); if (IS_ERR(psy->usb)) goto err_psy_usb; psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL); if (IS_ERR(psy->batt)) goto err_psy_batt; return 0; err_psy_batt: power_supply_unregister(psy->usb); err_psy_usb: power_supply_unregister(psy->ac); err_psy_ac: return -EPERM; } static void lp8727_unregister_psy(struct lp8727_chg *pchg) { struct lp8727_psy *psy = pchg->psy; if (!psy) return; power_supply_unregister(psy->ac); power_supply_unregister(psy->usb); power_supply_unregister(psy->batt); } #ifdef CONFIG_OF static struct lp8727_chg_param *lp8727_parse_charge_pdata(struct device *dev, struct device_node *np) { struct lp8727_chg_param *param; param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL); if (!param) goto out; of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level); of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg); out: return param; } static int lp8727_parse_dt(struct device *dev) { struct device_node *np = dev->of_node; struct device_node *child; struct lp8727_platform_data *pdata; const char *type; /* If charging parameter is not defined, just skip parsing the dt */ if (of_get_child_count(np) == 0) goto out; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec); for_each_child_of_node(np, child) { of_property_read_string(child, "charger-type", &type); if (!strcmp(type, "ac")) pdata->ac = lp8727_parse_charge_pdata(dev, child); if (!strcmp(type, "usb")) pdata->usb = lp8727_parse_charge_pdata(dev, child); } dev->platform_data = pdata; out: return 0; } #else static int lp8727_parse_dt(struct device *dev) { return 0; } #endif static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id) { struct lp8727_chg *pchg; int ret; if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) return -EIO; if (cl->dev.of_node) { ret = lp8727_parse_dt(&cl->dev); if (ret) return ret; } pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL); if (!pchg) return -ENOMEM; pchg->client = cl; pchg->dev = &cl->dev; pchg->pdata = cl->dev.platform_data; i2c_set_clientdata(cl, pchg); mutex_init(&pchg->xfer_lock); ret = lp8727_init_device(pchg); if (ret) { dev_err(pchg->dev, "i2c communication err: %d", ret); return ret; } ret = lp8727_register_psy(pchg); if (ret) { dev_err(pchg->dev, "power supplies register err: %d", ret); return ret; } ret = lp8727_setup_irq(pchg); if (ret) { dev_err(pchg->dev, "irq handler err: %d", ret); lp8727_unregister_psy(pchg); return ret; } return 0; } static int lp8727_remove(struct i2c_client *cl) { struct lp8727_chg *pchg = i2c_get_clientdata(cl); lp8727_release_irq(pchg); lp8727_unregister_psy(pchg); return 0; } static const struct of_device_id lp8727_dt_ids[] = { { .compatible = "ti,lp8727", }, { } }; MODULE_DEVICE_TABLE(of, lp8727_dt_ids); static const struct i2c_device_id lp8727_ids[] = { {"lp8727", 0}, { } }; MODULE_DEVICE_TABLE(i2c, lp8727_ids); static struct i2c_driver lp8727_driver = { .driver = { .name = "lp8727", .of_match_table = of_match_ptr(lp8727_dt_ids), }, .probe = lp8727_probe, .remove = lp8727_remove, .id_table = lp8727_ids, }; module_i2c_driver(lp8727_driver); MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver"); MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>"); MODULE_LICENSE("GPL");