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; }
/* * 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; }
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; }