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linux-sg2042/drivers/power/lp8727_charger.c

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/*
* 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>
#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->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->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 = pchg->pdata->get_batt_present();
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (!pdata)
return -EINVAL;
if (pdata->get_batt_level)
val->intval = pchg->pdata->get_batt_level();
break;
case POWER_SUPPLY_PROP_CAPACITY:
if (!pdata)
return -EINVAL;
if (pdata->get_batt_capacity)
val->intval = pchg->pdata->get_batt_capacity();
break;
case POWER_SUPPLY_PROP_TEMP:
if (!pdata)
return -EINVAL;
if (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 eoc_level;
u8 ichg;
u8 val;
/* skip if no charger exists */
if (!lp8727_is_charger_attached(psy->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 int lp8727_register_psy(struct lp8727_chg *pchg)
{
struct lp8727_psy *psy;
psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
if (!psy)
return -ENOMEM;
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_ac;
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_usb;
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_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);
}
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 = 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 __devexit 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 i2c_device_id lp8727_ids[] = {
{"lp8727", 0},
{ }
};
MODULE_DEVICE_TABLE(i2c, lp8727_ids);
static struct i2c_driver lp8727_driver = {
.driver = {
.name = "lp8727",
},
.probe = lp8727_probe,
.remove = __devexit_p(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");
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