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/*
* (C) Copyright 2010
* Texas Instruments, <www.ti.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#ifdef CONFIG_TWL6030_POWER
#include <twl6030.h>
/* Functions to read and write from TWL6030 */
static inline int twl6030_i2c_write_u8(u8 chip_no, u8 val, u8 reg)
{
return i2c_write(chip_no, reg, 1, &val, 1);
}
static inline int twl6030_i2c_read_u8(u8 chip_no, u8 *val, u8 reg)
{
return i2c_read(chip_no, reg, 1, val, 1);
}
static int twl6030_gpadc_read_channel(u8 channel_no)
{
u8 lsb = 0;
u8 msb = 0;
int ret = 0;
ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &lsb,
GPCH0_LSB + channel_no * 2);
if (ret)
return ret;
ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &msb,
GPCH0_MSB + channel_no * 2);
if (ret)
return ret;
return (msb << 8) | lsb;
}
static int twl6030_gpadc_sw2_trigger(void)
{
u8 val;
int ret = 0;
ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC, CTRL_P2_SP2, CTRL_P2);
if (ret)
return ret;
/* Waiting until the SW1 conversion ends*/
val = CTRL_P2_BUSY;
while (!((val & CTRL_P2_EOCP2) && (!(val & CTRL_P2_BUSY)))) {
ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &val, CTRL_P2);
if (ret)
return ret;
udelay(1000);
}
return 0;
}
void twl6030_stop_usb_charging(void)
{
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, 0, CONTROLLER_CTRL1);
return;
}
void twl6030_start_usb_charging(void)
{
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_VICHRG_1500,
CHARGERUSB_VICHRG);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CIN_LIMIT_NONE,
CHARGERUSB_CINLIMIT);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, MBAT_TEMP,
CONTROLLER_INT_MASK);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, MASK_MCHARGERUSB_THMREG,
CHARGERUSB_INT_MASK);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_VOREG_4P0,
CHARGERUSB_VOREG);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL2_VITERM_400,
CHARGERUSB_CTRL2);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, TERM, CHARGERUSB_CTRL1);
/* Enable USB charging */
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CONTROLLER_CTRL1_EN_CHARGER,
CONTROLLER_CTRL1);
return;
}
int twl6030_get_battery_current(void)
{
int battery_current = 0;
u8 msb = 0;
u8 lsb = 0;
twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &msb, FG_REG_11);
twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &lsb, FG_REG_10);
battery_current = ((msb << 8) | lsb);
/* convert 10 bit signed number to 16 bit signed number */
if (battery_current >= 0x2000)
battery_current = (battery_current - 0x4000);
battery_current = battery_current * 3000 / 4096;
printf("Battery Current: %d mA\n", battery_current);
return battery_current;
}
int twl6030_get_battery_voltage(void)
{
int battery_volt = 0;
int ret = 0;
/* Start GPADC SW conversion */
ret = twl6030_gpadc_sw2_trigger();
if (ret) {
printf("Failed to convert battery voltage\n");
return ret;
}
/* measure Vbat voltage */
battery_volt = twl6030_gpadc_read_channel(7);
if (battery_volt < 0) {
printf("Failed to read battery voltage\n");
return ret;
}
battery_volt = (battery_volt * 25 * 1000) >> (10 + 2);
printf("Battery Voltage: %d mV\n", battery_volt);
return battery_volt;
}
void twl6030_init_battery_charging(void)
{
u8 stat1 = 0;
int battery_volt = 0;
int ret = 0;
/* Enable VBAT measurement */
twl6030_i2c_write_u8(TWL6030_CHIP_PM, VBAT_MEAS, MISC1);
/* Enable GPADC module */
ret = twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, FGS | GPADCS, TOGGLE1);
if (ret) {
printf("Failed to enable GPADC\n");
return;
}
battery_volt = twl6030_get_battery_voltage();
if (battery_volt < 0)
return;
if (battery_volt < 3000)
printf("Main battery voltage too low!\n");
/* Check for the presence of USB charger */
twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &stat1, CONTROLLER_STAT1);
/* check for battery presence indirectly via Fuel gauge */
if ((stat1 & VBUS_DET) && (battery_volt < 3300))
twl6030_start_usb_charging();
return;
}
void twl6030_usb_device_settings()
{
u8 data = 0;
/* Select APP Group and set state to ON */
twl6030_i2c_write_u8(TWL6030_CHIP_PM, 0x21, VUSB_CFG_STATE);
twl6030_i2c_read_u8(TWL6030_CHIP_PM, &data, MISC2);
data |= 0x10;
/* Select the input supply for VBUS regulator */
twl6030_i2c_write_u8(TWL6030_CHIP_PM, data, MISC2);
}
#endif
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