/*
* Enable the max77686 register
*
* @param reg register number of buck/ldo to be enabled
* @param enable enable or disable bit
*
* REG_DISABLE = 0,
needed to set the buck/ldo enable bit OFF
* @return Return 0 if ok, else -1
*/
static int max77686_enablereg(unsigned int bus, enum max77686_regnum reg, int enable)
{
struct max77686_para *pmic;
unsigned char read_data;
int ret;
pmic = &max77686_param[reg];
ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->reg_enaddr,
&read_data);
if (ret != 0) {
printk(BIOS_DEBUG, "max77686 i2c read failed.\n");
return -1;
}
if (enable == REG_DISABLE) {
clrbits_8(&read_data,
pmic->reg_enbitmask << pmic->reg_enbitpos);
} else {
clrsetbits_8(&read_data,
pmic->reg_enbitmask << pmic->reg_enbitpos,
pmic->reg_enbiton << pmic->reg_enbitpos);
}
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR,
pmic->reg_enaddr, read_data);
if (ret != 0) {
printk(BIOS_DEBUG, "max77686 i2c write failed.\n");
return -1;
}
return 0;
}
int max77686_disable_backup_batt(unsigned int bus)
{
unsigned char val;
int ret;
ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, REG_BBAT, &val);
if (ret) {
printk(BIOS_DEBUG, "max77686 i2c read failed\n");
return ret;
}
/* If we already have the correct values, exit */
if ((val & (BBAT_BBCVS_MASK | BBAT_BBCHOSTEN_MASK)) ==
BBAT_BBCVS_MASK)
return 0;
/* First disable charging */
val &= ~BBAT_BBCHOSTEN_MASK;
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
if (ret) {
printk(BIOS_DEBUG, "max77686 i2c write failed\n");
return -1;
}
/* Finally select 3.5V to minimize power consumption */
val |= BBAT_BBCVS_MASK;
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
if (ret) {
printk(BIOS_DEBUG, "max77686 i2c write failed\n");
return -1;
}
return 0;
}
static int max77686_do_volsetting(enum max77686_regnum reg, unsigned int volt,
int enable, int volt_units)
{
struct max77686_para *pmic;
unsigned char read_data;
int vol_level = 0;
int ret;
pmic = &max77686_param[reg];
if (pmic->vol_addr == 0) {
debug("not a voltage register.\n");
return -1;
}
ret = max77686_i2c_read(MAX77686_I2C_ADDR, pmic->vol_addr, &read_data);
if (ret != 0) {
debug("max77686 i2c read failed.\n");
return -1;
}
if (volt_units == MAX77686_UV)
vol_level = volt - pmic->vol_min * 1000;
else
vol_level = (volt - pmic->vol_min) * 1000;
if (vol_level < 0) {
debug("Not a valid voltage level to set\n");
return -1;
}
vol_level /= pmic->vol_div;
clrsetbits_8(&read_data, pmic->vol_bitmask << pmic->vol_bitpos,
vol_level << pmic->vol_bitpos);
ret = max77686_i2c_write(MAX77686_I2C_ADDR, pmic->vol_addr, read_data);
if (ret != 0) {
debug("max77686 i2c write failed.\n");
return -1;
}
ret = max77686_enablereg(reg, enable);
if (ret != 0) {
debug("Failed to enable buck/ldo.\n");
return -1;
}
return 0;
}
