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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>
#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
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