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/*
* smb347_charger.c
*
* Copyright (C) 2011 Samsung Electronics
* SangYoung Son <hello.son@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/power_supply.h>
#include <linux/power/smb_charger.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/battery.h>
/* SMB347 Registers. */
#define SMB347_CHARGE_CURRENT 0x00
#define SMB347_INPUT_CURRENTLIMIT 0x01
#define SMB347_VARIOUS_FUNCTIONS 0x02
#define SMB347_FLOAT_VOLTAGE 0x03
#define SMB347_CHARGE_CONTROL 0x04
#define SMB347_STAT_TIMERS_CONTROL 0x05
#define SMB347_PIN_ENABLE_CONTROL 0x06
#define SMB347_THERM_CONTROL_A 0x07
#define SMB347_SYSOK_USB30_SELECTION 0x08
#define SMB347_OTHER_CONTROL_A 0x09
#define SMB347_OTG_TLIM_THERM_CONTROL 0x0A
#define SMB347_LIMIT_CELL_TEMPERATURE_MONITOR 0x0B
#define SMB347_FAULT_INTERRUPT 0x0C
#define SMB347_STATUS_INTERRUPT 0x0D
#define SMB347_COMMAND_A 0x30
#define SMB347_COMMAND_B 0x31
#define SMB347_STATUS_C 0x3D
/* Status register C */
#define SMB347_CHARGING_STATUS (1 << 5)
#define SMB347_CHARGER_ERROR (1 << 6)
#define CHARGER_STATUS_FULL 0x1
#define CHARGER_STATUS_CHARGERERR 0x2
#define CHARGER_STATUS_USB_FAIL 0x3
#define CHARGER_VBATT_UVLO 0x4
struct smb347_chg_data {
struct device *dev;
struct i2c_client *client;
struct smb_charger_data *pdata;
struct smb_charger_callbacks callbacks;
};
static int smb347_i2c_read(struct i2c_client *client, u8 reg, u8 *data)
{
int ret = 0;
if (!client)
return -ENODEV;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return -EIO;
}
*data = ret & 0xff;
return 0;
}
static int smb347_i2c_write(struct i2c_client *client, u8 reg, u8 data)
{
int ret;
if (!client)
return -ENODEV;
ret = i2c_smbus_write_byte_data(client, reg, data);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static void smb347_charger_init(struct smb347_chg_data *chg)
{
/* Allow volatile writes to CONFIG registers */
smb347_i2c_write(chg->client, SMB347_COMMAND_A, 0x80);
/* Command B : USB1 mode, USB mode */
smb347_i2c_write(chg->client, SMB347_COMMAND_B, 0x00);
/* Charge curr : Fast-chg 2200mA */
/* Pre-charge curr 250mA, Term curr 250mA */
smb347_i2c_write(chg->client, SMB347_CHARGE_CURRENT, 0xDD);
/* Pin enable control : Charger enable control EN Pin - Active Low */
/* : USB5/1/HC or USB9/1.5/HC Control - Register Control */
/* : USB5/1/HC Input state - Tri-state Input */
smb347_i2c_write(chg->client, SMB347_PIN_ENABLE_CONTROL, 0x60);
/* Input current limit : DCIN 1800mA, USBIN HC 1800mA */
smb347_i2c_write(chg->client, SMB347_INPUT_CURRENTLIMIT, 0x66);
/* Various func. : USBIN primary input, VCHG func. enable */
smb347_i2c_write(chg->client, SMB347_VARIOUS_FUNCTIONS, 0x87);
/* Float voltage : 4.2V */
smb347_i2c_write(chg->client, SMB347_FLOAT_VOLTAGE, 0x63);
/* Charge control : Auto recharge disable, APSD disable */
smb347_i2c_write(chg->client, SMB347_CHARGE_CONTROL, 0x80);
/* STAT, Timer control : STAT active low, Complete time out 1527min. */
smb347_i2c_write(chg->client, SMB347_STAT_TIMERS_CONTROL, 0x1A);
/* Therm control : Therm monitor disable */
smb347_i2c_write(chg->client, SMB347_THERM_CONTROL_A, 0x7F);
/* USB selection : USB2.0(100mA/500mA), INOK polarity */
/* Active low */
smb347_i2c_write(chg->client, SMB347_SYSOK_USB30_SELECTION, 0x08);
/* Other control */
smb347_i2c_write(chg->client, SMB347_OTHER_CONTROL_A, 0x1D);
/* OTG tlim therm control */
smb347_i2c_write(chg->client, SMB347_OTG_TLIM_THERM_CONTROL, 0x3F);
/* Limit cell temperature */
smb347_i2c_write(chg->client,
SMB347_LIMIT_CELL_TEMPERATURE_MONITOR, 0x01);
/* Fault interrupt : Clear */
smb347_i2c_write(chg->client, SMB347_FAULT_INTERRUPT, 0x00);
/* STATUS ingerrupt : Clear */
smb347_i2c_write(chg->client, SMB347_STATUS_INTERRUPT, 0x00);
}
static int smb347_read_status(struct smb_charger_callbacks *ptr)
{
struct smb347_chg_data *chg = container_of(ptr,
struct smb347_chg_data, callbacks);
u8 res = 0;
u8 reg_c;
int ret;
ret = smb347_i2c_read(chg->client, SMB347_STATUS_C, ®_c);
if (ret < 0) {
dev_err(&chg->client->dev, "%s: I2C Read fail addr: 0x%x\n",
__func__, SMB347_STATUS_C);
msleep(50);
smb347_i2c_read(chg->client, SMB347_STATUS_C, ®_c);
}
dev_dbg(&chg->client->dev,
"addr: 0x%x, data: 0x%x\n", SMB347_STATUS_C, reg_c);
if (reg_c & SMB347_CHARGER_ERROR)
res = CHARGER_STATUS_CHARGERERR;
else if (reg_c & SMB347_CHARGING_STATUS)
res = CHARGER_STATUS_FULL;
return res;
}
static void smb347_set_charging_state(struct smb_charger_callbacks *ptr,
int cable_status)
{
struct smb347_chg_data *chg = container_of(ptr,
struct smb347_chg_data, callbacks);
if (cable_status) {
/* Init smb347 charger */
smb347_charger_init(chg);
switch (cable_status) {
case CABLE_TYPE_AC:
/* Input current limit : DCIN 1800mA, USBIN HC 1800mA */
smb347_i2c_write(chg->client,
SMB347_INPUT_CURRENTLIMIT, 0x66);
/* CommandB : High-current mode */
smb347_i2c_write(chg->client, SMB347_COMMAND_B, 0x03);
dev_info(&chg->client->dev,
"charging current limit set to 1.8A\n");
break;
case CABLE_TYPE_USB:
/* CommandB : USB5 */
smb347_i2c_write(chg->client, SMB347_COMMAND_B, 0x02);
dev_info(&chg->client->dev,
"charging current limit set to 0.5A\n");
break;
default:
/* CommandB : USB1 */
smb347_i2c_write(chg->client, SMB347_COMMAND_B, 0x00);
dev_info(&chg->client->dev,
"charging current limit set to 0.1A\n");
break;
}
}
}
static int smb347_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct smb347_chg_data *chg;
int ret = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
return -EIO;
chg = kzalloc(sizeof(struct smb347_chg_data), GFP_KERNEL);
if (!chg)
return -ENOMEM;
chg->client = client;
if (!chg->client) {
dev_err(&client->dev, "%s: no client\n", __func__);
ret = -EINVAL;
goto err_client;
} else {
chg->dev = &client->dev;
}
chg->pdata = client->dev.platform_data;
if (!chg->pdata) {
dev_err(&client->dev, "%s: no platform data supplied\n", __func__);
ret = -EINVAL;
goto err_pdata;
}
i2c_set_clientdata(client, chg);
chg->callbacks.set_charging_state = smb347_set_charging_state;
chg->callbacks.get_status_reg = smb347_read_status;
if (chg->pdata->register_callbacks)
chg->pdata->register_callbacks(&chg->callbacks);
dev_info(&client->dev, "probed\n");
return 0;
err_pdata:
err_client:
dev_err(&client->dev, "%s: probe failed\n", __func__);
kfree(chg);
return ret;
}
static int __devexit smb347_remove(struct i2c_client *client)
{
struct smb347_chg_data *chg = i2c_get_clientdata(client);
if (chg->pdata && chg->pdata->unregister_callbacks)
chg->pdata->unregister_callbacks();
kfree(chg);
return 0;
}
static const struct i2c_device_id smb347_id[] = {
{ "smb347-charger", 0 },
{ }
};
static struct i2c_driver smb347_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "smb347-charger",
},
.probe = smb347_i2c_probe,
.remove = smb347_remove,
.id_table = smb347_id,
};
MODULE_DEVICE_TABLE(i2c, smb347_id);
static int __init smb347_init(void)
{
return i2c_add_driver(&smb347_i2c_driver);
}
static void __exit smb347_exit(void)
{
i2c_del_driver(&smb347_i2c_driver);
}
module_init(smb347_init);
module_exit(smb347_exit);
MODULE_AUTHOR("SangYoung Son <hello.son@samsung.com>");
MODULE_DESCRIPTION("smb347 charger driver");
MODULE_LICENSE("GPL");
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