diff options
Diffstat (limited to 'drivers/power/lp8727_charger.c')
-rw-r--r-- | drivers/power/lp8727_charger.c | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c new file mode 100644 index 00000000000..b15b575c070 --- /dev/null +++ b/drivers/power/lp8727_charger.c @@ -0,0 +1,494 @@ +/* + * Driver for LP8727 Micro/Mini USB IC with intergrated charger + * + * 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/lp8727.h> + +#define DEBOUNCE_MSEC 270 + +/* Registers */ +#define CTRL1 0x1 +#define CTRL2 0x2 +#define SWCTRL 0x3 +#define INT1 0x4 +#define INT2 0x5 +#define STATUS1 0x6 +#define STATUS2 0x7 +#define CHGCTRL2 0x9 + +/* CTRL1 register */ +#define CP_EN (1 << 0) +#define ADC_EN (1 << 1) +#define ID200_EN (1 << 4) + +/* CTRL2 register */ +#define CHGDET_EN (1 << 1) +#define INT_EN (1 << 6) + +/* SWCTRL register */ +#define SW_DM1_DM (0x0 << 0) +#define SW_DM1_U1 (0x1 << 0) +#define SW_DM1_HiZ (0x7 << 0) +#define SW_DP2_DP (0x0 << 3) +#define SW_DP2_U2 (0x1 << 3) +#define SW_DP2_HiZ (0x7 << 3) + +/* INT1 register */ +#define IDNO (0xF << 0) +#define VBUS (1 << 4) + +/* STATUS1 register */ +#define CHGSTAT (3 << 4) +#define CHPORT (1 << 6) +#define DCPORT (1 << 7) + +/* STATUS2 register */ +#define TEMP_STAT (3 << 5) + +enum lp8727_dev_id { + ID_NONE, + ID_TA, + ID_DEDICATED_CHG, + ID_USB_CHG, + ID_USB_DS, + ID_MAX, +}; + +enum lp8727_chg_stat { + PRECHG, + CC, + CV, + EOC, +}; + +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 delayed_work work; + struct workqueue_struct *irqthread; + struct lp8727_platform_data *pdata; + struct lp8727_psy *psy; + struct lp8727_chg_param *chg_parm; + enum lp8727_dev_id devid; +}; + +static int lp8727_i2c_read(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 int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len) +{ + s32 ret; + + mutex_lock(&pchg->xfer_lock); + ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data); + mutex_unlock(&pchg->xfer_lock); + + return ret; +} + +static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg, + u8 *data) +{ + return lp8727_i2c_read(pchg, reg, data, 1); +} + +static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg, + u8 *data) +{ + return lp8727_i2c_write(pchg, reg, data, 1); +} + +static int lp8727_is_charger_attached(const char *name, int id) +{ + if (name) { + if (!strcmp(name, "ac")) + return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0; + else if (!strcmp(name, "usb")) + return (id == ID_USB_CHG) ? 1 : 0; + } + + return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0; +} + +static void lp8727_init_device(struct lp8727_chg *pchg) +{ + u8 val; + + val = ID200_EN | ADC_EN | CP_EN; + if (lp8727_i2c_write_byte(pchg, CTRL1, &val)) + dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1); + + val = INT_EN | CHGDET_EN; + if (lp8727_i2c_write_byte(pchg, CTRL2, &val)) + dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2); +} + +static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg) +{ + u8 val; + lp8727_i2c_read_byte(pchg, STATUS1, &val); + return (val & DCPORT); +} + +static int lp8727_is_usb_charger(struct lp8727_chg *pchg) +{ + u8 val; + lp8727_i2c_read_byte(pchg, STATUS1, &val); + return (val & CHPORT); +} + +static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw) +{ + u8 val = sw; + lp8727_i2c_write_byte(pchg, SWCTRL, &val); +} + +static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin) +{ + u8 devid = ID_NONE; + u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ; + + switch (id) { + case 0x5: + devid = ID_TA; + pchg->chg_parm = &pchg->pdata->ac; + break; + case 0xB: + if (lp8727_is_dedicated_charger(pchg)) { + pchg->chg_parm = &pchg->pdata->ac; + devid = ID_DEDICATED_CHG; + } else if (lp8727_is_usb_charger(pchg)) { + pchg->chg_parm = &pchg->pdata->usb; + devid = ID_USB_CHG; + swctrl = SW_DM1_DM | SW_DP2_DP; + } else if (vbusin) { + devid = ID_USB_DS; + swctrl = SW_DM1_DM | SW_DP2_DP; + } + break; + default: + devid = ID_NONE; + pchg->chg_parm = NULL; + break; + } + + pchg->devid = devid; + lp8727_ctrl_switch(pchg, swctrl); +} + +static void lp8727_enable_chgdet(struct lp8727_chg *pchg) +{ + u8 val; + + lp8727_i2c_read_byte(pchg, CTRL2, &val); + val |= CHGDET_EN; + lp8727_i2c_write_byte(pchg, CTRL2, &val); +} + +static void lp8727_delayed_func(struct work_struct *_work) +{ + u8 intstat[2], idno, vbus; + struct lp8727_chg *pchg = + container_of(_work, struct lp8727_chg, work.work); + + if (lp8727_i2c_read(pchg, INT1, intstat, 2)) { + dev_err(pchg->dev, "can not read INT registers\n"); + return; + } + + idno = intstat[0] & IDNO; + vbus = intstat[0] & 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; + unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC); + + queue_delayed_work(pchg->irqthread, &pchg->work, delay); + + return IRQ_HANDLED; +} + +static void lp8727_intr_config(struct lp8727_chg *pchg) +{ + INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func); + + pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd"); + if (!pchg->irqthread) + dev_err(pchg->dev, "can not create thread for lp8727\n"); + + if (request_threaded_irq(pchg->client->irq, + NULL, + lp8727_isr_func, + IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) { + dev_err(pchg->dev, "lp8727 irq can not be registered\n"); + } +} + +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) + val->intval = lp8727_is_charger_attached(psy->name, + pchg->devid); + + return 0; +} + +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); + u8 read; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + if (lp8727_is_charger_attached(psy->name, pchg->devid)) { + lp8727_i2c_read_byte(pchg, STATUS1, &read); + if (((read & CHGSTAT) >> 4) == EOC) + val->intval = POWER_SUPPLY_STATUS_FULL; + else + val->intval = POWER_SUPPLY_STATUS_CHARGING; + } else { + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + } + break; + case POWER_SUPPLY_PROP_HEALTH: + lp8727_i2c_read_byte(pchg, STATUS2, &read); + read = (read & TEMP_STAT) >> 5; + if (read >= 0x1 && read <= 0x3) + val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; + else + val->intval = POWER_SUPPLY_HEALTH_GOOD; + break; + case POWER_SUPPLY_PROP_PRESENT: + if (pchg->pdata->get_batt_present) + val->intval = pchg->pdata->get_batt_present(); + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + if (pchg->pdata->get_batt_level) + val->intval = pchg->pdata->get_batt_level(); + break; + case POWER_SUPPLY_PROP_CAPACITY: + if (pchg->pdata->get_batt_capacity) + val->intval = pchg->pdata->get_batt_capacity(); + break; + case POWER_SUPPLY_PROP_TEMP: + if (pchg->pdata->get_batt_temp) + val->intval = pchg->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 val; + u8 eoc_level, ichg; + + if (lp8727_is_charger_attached(psy->name, pchg->devid)) { + if (pchg->chg_parm) { + eoc_level = pchg->chg_parm->eoc_level; + ichg = pchg->chg_parm->ichg; + val = (ichg << 4) | eoc_level; + lp8727_i2c_write_byte(pchg, CHGCTRL2, &val); + } + } +} + +static int lp8727_register_psy(struct lp8727_chg *pchg) +{ + struct lp8727_psy *psy; + + psy = kzalloc(sizeof(*psy), GFP_KERNEL); + if (!psy) + goto err_mem; + + pchg->psy = psy; + + psy->ac.name = "ac"; + psy->ac.type = POWER_SUPPLY_TYPE_MAINS; + psy->ac.properties = lp8727_charger_prop; + psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop); + psy->ac.get_property = lp8727_charger_get_property; + psy->ac.supplied_to = battery_supplied_to; + psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to); + + if (power_supply_register(pchg->dev, &psy->ac)) + goto err_psy; + + psy->usb.name = "usb"; + psy->usb.type = POWER_SUPPLY_TYPE_USB; + psy->usb.properties = lp8727_charger_prop; + psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop); + psy->usb.get_property = lp8727_charger_get_property; + psy->usb.supplied_to = battery_supplied_to; + psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to); + + if (power_supply_register(pchg->dev, &psy->usb)) + goto err_psy; + + psy->batt.name = "main_batt"; + psy->batt.type = POWER_SUPPLY_TYPE_BATTERY; + psy->batt.properties = lp8727_battery_prop; + psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop); + psy->batt.get_property = lp8727_battery_get_property; + psy->batt.external_power_changed = lp8727_charger_changed; + + if (power_supply_register(pchg->dev, &psy->batt)) + goto err_psy; + + return 0; + +err_mem: + return -ENOMEM; +err_psy: + kfree(psy); + 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); + kfree(psy); +} + +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; + + pchg = kzalloc(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); + + lp8727_init_device(pchg); + lp8727_intr_config(pchg); + + ret = lp8727_register_psy(pchg); + if (ret) + dev_err(pchg->dev, + "can not register power supplies. err=%d", ret); + + return 0; +} + +static int __devexit lp8727_remove(struct i2c_client *cl) +{ + struct lp8727_chg *pchg = i2c_get_clientdata(cl); + + lp8727_unregister_psy(pchg); + free_irq(pchg->client->irq, pchg); + flush_workqueue(pchg->irqthread); + destroy_workqueue(pchg->irqthread); + kfree(pchg); + return 0; +} + +static const struct i2c_device_id lp8727_ids[] = { + {"lp8727", 0}, +}; + +static struct i2c_driver lp8727_driver = { + .driver = { + .name = "lp8727", + }, + .probe = lp8727_probe, + .remove = __devexit_p(lp8727_remove), + .id_table = lp8727_ids, +}; + +static int __init lp8727_init(void) +{ + return i2c_add_driver(&lp8727_driver); +} + +static void __exit lp8727_exit(void) +{ + i2c_del_driver(&lp8727_driver); +} + +module_init(lp8727_init); +module_exit(lp8727_exit); + +MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver"); +MODULE_AUTHOR + ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>"); +MODULE_LICENSE("GPL"); |