diff options
Diffstat (limited to 'drivers/regulator/max77693-regulator.c')
| -rw-r--r-- | drivers/regulator/max77693-regulator.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/regulator/max77693-regulator.c b/drivers/regulator/max77693-regulator.c new file mode 100644 index 000000000000..de730fd3f8a5 --- /dev/null +++ b/drivers/regulator/max77693-regulator.c @@ -0,0 +1,318 @@ +/* + * max77693.c - Regulator driver for the Maxim 77693 and 77843 + * + * Copyright (C) 2013-2015 Samsung Electronics + * Jonghwa Lee <jonghwa3.lee@samsung.com> + * Krzysztof Kozlowski <k.kozlowski.k@gmail.com> + * + * 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 + * + * This driver is based on max77686.c + */ + +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/export.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/mfd/max77693.h> +#include <linux/mfd/max77693-common.h> +#include <linux/mfd/max77693-private.h> +#include <linux/mfd/max77843-private.h> +#include <linux/regulator/of_regulator.h> +#include <linux/regmap.h> + +/* + * ID for MAX77843 regulators. + * There is no need for such for MAX77693. + */ +enum max77843_regulator_type { + MAX77843_SAFEOUT1 = 0, + MAX77843_SAFEOUT2, + MAX77843_CHARGER, + + MAX77843_NUM, +}; + +/* Register differences between chargers: MAX77693 and MAX77843 */ +struct chg_reg_data { + unsigned int linear_reg; + unsigned int linear_mask; + unsigned int uA_step; + unsigned int min_sel; +}; + +/* + * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA + * 0x00, 0x01, 0x2, 0x03 = 60 mA + * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA + * Actually for MAX77693 the driver manipulates the maximum input current, + * not the fast charge current (output). This should be fixed. + * + * On MAX77843 the calculation formula is the same (except values). + * Fortunately it properly manipulates the fast charge current. + */ +static int max77693_chg_get_current_limit(struct regulator_dev *rdev) +{ + const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev); + unsigned int chg_min_uA = rdev->constraints->min_uA; + unsigned int chg_max_uA = rdev->constraints->max_uA; + unsigned int reg, sel; + unsigned int val; + int ret; + + ret = regmap_read(rdev->regmap, reg_data->linear_reg, ®); + if (ret < 0) + return ret; + + sel = reg & reg_data->linear_mask; + + /* the first four codes for charger current are all 60mA */ + if (sel <= reg_data->min_sel) + sel = 0; + else + sel -= reg_data->min_sel; + + val = chg_min_uA + reg_data->uA_step * sel; + if (val > chg_max_uA) + return -EINVAL; + + return val; +} + +static int max77693_chg_set_current_limit(struct regulator_dev *rdev, + int min_uA, int max_uA) +{ + const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev); + unsigned int chg_min_uA = rdev->constraints->min_uA; + int sel = 0; + + while (chg_min_uA + reg_data->uA_step * sel < min_uA) + sel++; + + if (chg_min_uA + reg_data->uA_step * sel > max_uA) + return -EINVAL; + + /* the first four codes for charger current are all 60mA */ + sel += reg_data->min_sel; + + return regmap_write(rdev->regmap, reg_data->linear_reg, sel); +} +/* end of CHARGER regulator ops */ + +/* Returns regmap suitable for given regulator on chosen device */ +static struct regmap *max77693_get_regmap(enum max77693_types type, + struct max77693_dev *max77693, + int reg_id) +{ + if (type == TYPE_MAX77693) + return max77693->regmap; + + /* Else: TYPE_MAX77843 */ + switch (reg_id) { + case MAX77843_SAFEOUT1: + case MAX77843_SAFEOUT2: + return max77693->regmap; + case MAX77843_CHARGER: + return max77693->regmap_chg; + default: + return max77693->regmap; + } +} + +static const unsigned int max77693_safeout_table[] = { + 4850000, + 4900000, + 4950000, + 3300000, +}; + +static struct regulator_ops max77693_safeout_ops = { + .list_voltage = regulator_list_voltage_table, + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, +}; + +static struct regulator_ops max77693_charger_ops = { + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .get_current_limit = max77693_chg_get_current_limit, + .set_current_limit = max77693_chg_set_current_limit, +}; + +#define max77693_regulator_desc_esafeout(_num) { \ + .name = "ESAFEOUT"#_num, \ + .id = MAX77693_ESAFEOUT##_num, \ + .of_match = of_match_ptr("ESAFEOUT"#_num), \ + .regulators_node = of_match_ptr("regulators"), \ + .n_voltages = 4, \ + .ops = &max77693_safeout_ops, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + .volt_table = max77693_safeout_table, \ + .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ + .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \ + .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ + .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \ +} + +static const struct regulator_desc max77693_supported_regulators[] = { + max77693_regulator_desc_esafeout(1), + max77693_regulator_desc_esafeout(2), + { + .name = "CHARGER", + .id = MAX77693_CHARGER, + .of_match = of_match_ptr("CHARGER"), + .regulators_node = of_match_ptr("regulators"), + .ops = &max77693_charger_ops, + .type = REGULATOR_CURRENT, + .owner = THIS_MODULE, + .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00, + .enable_mask = CHG_CNFG_00_CHG_MASK | + CHG_CNFG_00_BUCK_MASK, + .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK, + }, +}; + +static const struct chg_reg_data max77693_chg_reg_data = { + .linear_reg = MAX77693_CHG_REG_CHG_CNFG_09, + .linear_mask = CHG_CNFG_09_CHGIN_ILIM_MASK, + .uA_step = 20000, + .min_sel = 3, +}; + +#define max77843_regulator_desc_esafeout(num) { \ + .name = "SAFEOUT" # num, \ + .id = MAX77843_SAFEOUT ## num, \ + .ops = &max77693_safeout_ops, \ + .of_match = of_match_ptr("SAFEOUT" # num), \ + .regulators_node = of_match_ptr("regulators"), \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + .n_voltages = ARRAY_SIZE(max77693_safeout_table), \ + .volt_table = max77693_safeout_table, \ + .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \ + .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \ + .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \ + .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \ +} + +static const struct regulator_desc max77843_supported_regulators[] = { + [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1), + [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2), + [MAX77843_CHARGER] = { + .name = "CHARGER", + .id = MAX77843_CHARGER, + .ops = &max77693_charger_ops, + .of_match = of_match_ptr("CHARGER"), + .regulators_node = of_match_ptr("regulators"), + .type = REGULATOR_CURRENT, + .owner = THIS_MODULE, + .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00, + .enable_mask = MAX77843_CHG_MASK, + .enable_val = MAX77843_CHG_MASK, + }, +}; + +static const struct chg_reg_data max77843_chg_reg_data = { + .linear_reg = MAX77843_CHG_REG_CHG_CNFG_02, + .linear_mask = MAX77843_CHG_FAST_CHG_CURRENT_MASK, + .uA_step = MAX77843_CHG_FAST_CHG_CURRENT_STEP, + .min_sel = 2, +}; + +static int max77693_pmic_probe(struct platform_device *pdev) +{ + enum max77693_types type = platform_get_device_id(pdev)->driver_data; + struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent); + const struct regulator_desc *regulators; + unsigned int regulators_size; + int i; + struct regulator_config config = { }; + + config.dev = iodev->dev; + + switch (type) { + case TYPE_MAX77693: + regulators = max77693_supported_regulators; + regulators_size = ARRAY_SIZE(max77693_supported_regulators); + config.driver_data = (void *)&max77693_chg_reg_data; + break; + case TYPE_MAX77843: + regulators = max77843_supported_regulators; + regulators_size = ARRAY_SIZE(max77843_supported_regulators); + config.driver_data = (void *)&max77843_chg_reg_data; + break; + default: + dev_err(&pdev->dev, "Unsupported device type: %u\n", type); + return -ENODEV; + } + + for (i = 0; i < regulators_size; i++) { + struct regulator_dev *rdev; + + config.regmap = max77693_get_regmap(type, iodev, + regulators[i].id); + + rdev = devm_regulator_register(&pdev->dev, + ®ulators[i], &config); + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, + "Failed to initialize regulator-%d\n", i); + return PTR_ERR(rdev); + } + } + + return 0; +} + +static const struct platform_device_id max77693_pmic_id[] = { + { "max77693-pmic", TYPE_MAX77693 }, + { "max77843-regulator", TYPE_MAX77843 }, + {}, +}; + +MODULE_DEVICE_TABLE(platform, max77693_pmic_id); + +static struct platform_driver max77693_pmic_driver = { + .driver = { + .name = "max77693-pmic", + }, + .probe = max77693_pmic_probe, + .id_table = max77693_pmic_id, +}; + +static int __init max77693_pmic_init(void) +{ + return platform_driver_register(&max77693_pmic_driver); +} +subsys_initcall(max77693_pmic_init); + +static void __exit max77693_pmic_cleanup(void) +{ + platform_driver_unregister(&max77693_pmic_driver); +} +module_exit(max77693_pmic_cleanup); + +MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver"); +MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); +MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski.k@gmail.com>"); +MODULE_LICENSE("GPL"); |