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/*
* smb136_charger.c
*
* Copyright (C) 2011 Samsung Electronics
* Ikkeun Kim <iks.kim@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 as
* published by the Free Software Foundation.
*/
#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>
/* SMB136 Registers. */
#define SMB136_CHARGE_CURRENT 0x00
#define SMB136_INPUT_CURRENTLIMIT 0x01
#define SMB136_FLOAT_VOLTAGE 0x02
#define SMB136_CHARGE_CONTROL_A 0x03
#define SMB136_CHARGE_CONTROL_B 0x04
#define SMB136_PIN_ENABLE_CONTROL 0x05
#define SMB136_OTG_CONTROL 0x06
#define SMB136_SAFTY 0x09
#define SMB136_COMMAND_A 0x31
#define SMB136_STATUS_D 0x35
#define SMB136_STATUS_E 0x36
#define CHARGER_STATUS_FULL 0x1
#define CHARGER_STATUS_CHARGERERR 0x2
#define CHARGER_STATUS_USB_FAIL 0x3
#define CHARGER_VBATT_UVLO 0x4
struct smb136_chg_data {
struct device *dev;
struct i2c_client *client;
struct smb_charger_data *pdata;
struct smb_charger_callbacks callbacks;
};
static int smb136_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 smb136_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 int smb136_read_status(struct smb_charger_callbacks *ptr)
{
struct smb136_chg_data *chg = container_of(ptr,
struct smb136_chg_data, callbacks);
u8 reg_d;
u8 reg_e;
u8 res = 0;
int ret;
ret = smb136_i2c_read(chg->client, SMB136_STATUS_D, ®_d);
if (ret < 0) {
dev_err(&chg->client->dev, "%s: I2C read fail addr: 0x%x\n",
__func__, SMB136_STATUS_D);
msleep(50);
smb136_i2c_read(chg->client, SMB136_STATUS_D, ®_d);
}
ret = smb136_i2c_read(chg->client, SMB136_STATUS_E, ®_e);
if (ret < 0) {
dev_err(&chg->client->dev, "%s: I2C read fail addr: 0x%x\n",
__func__, SMB136_STATUS_E);
msleep(50);
smb136_i2c_read(chg->client, SMB136_STATUS_E, ®_e);
}
dev_dbg(&chg->client->dev,
"addr: 0x%x, data: 0x%x, addr: 0x%x, data: 0x%x\n",
SMB136_STATUS_D, reg_d, SMB136_STATUS_E, reg_e);
if (reg_e & 0x40) {
dev_dbg(&chg->client->dev,
"Charge current under termination current\n");
res = CHARGER_STATUS_FULL;
} else if (reg_e & 0x8) {
dev_info(&chg->client->dev,
"Charger status charger err\n");
res = CHARGER_STATUS_CHARGERERR;
} else if (reg_d & 0x80) {
dev_info(&chg->client->dev,
"USBIN<Vusb-fail OR USBIN>Vovlo\n");
res = CHARGER_STATUS_USB_FAIL;
} else if (reg_d & 0x1) {
dev_info(&chg->client->dev,
"USBIN<Vusb-fail OR USBIN>Vovlo\n");
res = CHARGER_VBATT_UVLO;
}
return res;
}
static void smb136_set_charging_state(struct smb_charger_callbacks *ptr,
int cable_status)
{
struct smb136_chg_data *chg = container_of(ptr,
struct smb136_chg_data, callbacks);
u8 data;
switch (cable_status) {
case CABLE_TYPE_AC:
dev_info(&chg->client->dev,
"charging current limit set to 1.3A/1.5A\n");
/* HC mode */
smb136_i2c_write(chg->client, SMB136_COMMAND_A, 0x8c);
/* Set charge current */
/* Over HW Rev 09 : 1.5A, else 1.3A */
data = 0xF4;
if (chg->pdata->hw_revision < 0x9)
data = 0xD4;
smb136_i2c_write(chg->client, SMB136_CHARGE_CURRENT, data);
break;
case CABLE_TYPE_USB:
/* Prevent in-rush current */
dev_info(&chg->client->dev,
"charging current limit set to 0.5A\n");
/* USBIN 500mA mode */
smb136_i2c_write(chg->client, SMB136_COMMAND_A, 0x88);
/* Set charge current to 500mA */
smb136_i2c_write(chg->client, SMB136_CHARGE_CURRENT, 0x14);
break;
case CABLE_TYPE_NONE:
default:
dev_info(&chg->client->dev,
"charging current limit set to 0.1A\n");
/* USB 100mA Mode, USB5/1 Current Levels */
/* Prevent in-rush current */
smb136_i2c_write(chg->client, SMB136_COMMAND_A, 0x80);
udelay(10);
/* Set charge current to 100mA */
/* Prevent in-rush current */
smb136_i2c_write(chg->client, SMB136_CHARGE_CURRENT, 0x14);
udelay(10);
}
/* 2. Change USB5/1/HC Control from Pin to I2C */
smb136_i2c_write(chg->client, SMB136_PIN_ENABLE_CONTROL, 0x8);
/* 4. Disable Automatic Input Current Limit */
/* Over HW Rev 09 : 1.3A, else 1.0A */
data = 0xE6;
if (chg->pdata->hw_revision < 0x09)
data = 0x66;
smb136_i2c_write(chg->client, SMB136_INPUT_CURRENTLIMIT, data);
/* 4. Automatic Recharge Disabed */
smb136_i2c_write(chg->client, SMB136_CHARGE_CONTROL_A, 0x8c);
/* 5. Safty timer Disabled */
smb136_i2c_write(chg->client, SMB136_CHARGE_CONTROL_B, 0x28);
/* 6. Disable USB D+/D- Detection */
smb136_i2c_write(chg->client, SMB136_OTG_CONTROL, 0x28);
/* 7. Set Output Polarity for STAT */
smb136_i2c_write(chg->client, SMB136_FLOAT_VOLTAGE, 0xCA);
/* 9. Re-load Enable */
smb136_i2c_write(chg->client, SMB136_SAFTY, 0x4b);
}
static int smb136_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct smb136_chg_data *chg;
int ret = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
return -EIO;
chg = kzalloc(sizeof(struct smb136_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 = smb136_set_charging_state;
chg->callbacks.get_status_reg = smb136_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 smb136_remove(struct i2c_client *client)
{
struct smb136_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 smb136_id[] = {
{ "smb136-charger", 0 },
{ }
};
static struct i2c_driver smb136_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "smb136-charger",
},
.id_table = smb136_id,
.probe = smb136_i2c_probe,
.remove = __devexit_p(smb136_remove),
.command = NULL,
};
MODULE_DEVICE_TABLE(i2c, smb136_id);
static int __init smb136_init(void)
{
return i2c_add_driver(&smb136_i2c_driver);
}
static void __exit smb136_exit(void)
{
i2c_del_driver(&smb136_i2c_driver);
}
module_init(smb136_init);
module_exit(smb136_exit);
MODULE_AUTHOR("Ikkeun Kim <iks.kim@samsung.com>");
MODULE_DESCRIPTION("smb136 charger driver");
MODULE_LICENSE("GPL");
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