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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/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_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 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 int lp8727_init_device(struct lp8727_chg *pchg)
{
u8 val;
int ret;
val = ID200_EN | ADC_EN | CP_EN;
ret = lp8727_write_byte(pchg, CTRL1, val);
if (ret)
return ret;
val = INT_EN | CHGDET_EN;
ret = lp8727_write_byte(pchg, CTRL2, val);
if (ret)
return ret;
return 0;
}
static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
{
u8 val;
lp8727_read_byte(pchg, STATUS1, &val);
return val & DCPORT;
}
static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
{
u8 val;
lp8727_read_byte(pchg, STATUS1, &val);
return val & CHPORT;
}
static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
{
lp8727_write_byte(pchg, SWCTRL, sw);
}
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_read_byte(pchg, CTRL2, &val);
val |= CHGDET_EN;
lp8727_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_read_bytes(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 int 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");
return -ENOMEM;
}
return request_threaded_irq(pchg->client->irq,
NULL,
lp8727_isr_func,
IRQF_TRIGGER_FALLING,
"lp8727_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
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