319 lines
9.2 KiB
C
319 lines
9.2 KiB
C
/*
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* max77693.c - Regulator driver for the Maxim 77693 and 77843
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*
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* Copyright (C) 2013-2015 Samsung Electronics
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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* Krzysztof Kozlowski <krzk@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This driver is based on max77686.c
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*/
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/mfd/max77693.h>
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#include <linux/mfd/max77693-common.h>
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#include <linux/mfd/max77693-private.h>
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#include <linux/mfd/max77843-private.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regmap.h>
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/*
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* ID for MAX77843 regulators.
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* There is no need for such for MAX77693.
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*/
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enum max77843_regulator_type {
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MAX77843_SAFEOUT1 = 0,
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MAX77843_SAFEOUT2,
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MAX77843_CHARGER,
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MAX77843_NUM,
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};
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/* Register differences between chargers: MAX77693 and MAX77843 */
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struct chg_reg_data {
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unsigned int linear_reg;
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unsigned int linear_mask;
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unsigned int uA_step;
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unsigned int min_sel;
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};
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/*
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* MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
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* 0x00, 0x01, 0x2, 0x03 = 60 mA
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* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
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* Actually for MAX77693 the driver manipulates the maximum input current,
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* not the fast charge current (output). This should be fixed.
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*
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* On MAX77843 the calculation formula is the same (except values).
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* Fortunately it properly manipulates the fast charge current.
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*/
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static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
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{
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const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
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unsigned int chg_min_uA = rdev->constraints->min_uA;
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unsigned int chg_max_uA = rdev->constraints->max_uA;
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unsigned int reg, sel;
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unsigned int val;
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int ret;
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ret = regmap_read(rdev->regmap, reg_data->linear_reg, ®);
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if (ret < 0)
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return ret;
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sel = reg & reg_data->linear_mask;
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/* the first four codes for charger current are all 60mA */
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if (sel <= reg_data->min_sel)
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sel = 0;
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else
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sel -= reg_data->min_sel;
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val = chg_min_uA + reg_data->uA_step * sel;
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if (val > chg_max_uA)
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return -EINVAL;
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return val;
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}
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static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
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int min_uA, int max_uA)
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{
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const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
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unsigned int chg_min_uA = rdev->constraints->min_uA;
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int sel = 0;
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while (chg_min_uA + reg_data->uA_step * sel < min_uA)
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sel++;
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if (chg_min_uA + reg_data->uA_step * sel > max_uA)
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return -EINVAL;
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/* the first four codes for charger current are all 60mA */
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sel += reg_data->min_sel;
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return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
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}
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/* end of CHARGER regulator ops */
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/* Returns regmap suitable for given regulator on chosen device */
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static struct regmap *max77693_get_regmap(enum max77693_types type,
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struct max77693_dev *max77693,
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int reg_id)
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{
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if (type == TYPE_MAX77693)
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return max77693->regmap;
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/* Else: TYPE_MAX77843 */
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switch (reg_id) {
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case MAX77843_SAFEOUT1:
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case MAX77843_SAFEOUT2:
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return max77693->regmap;
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case MAX77843_CHARGER:
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return max77693->regmap_chg;
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default:
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return max77693->regmap;
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}
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}
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static const unsigned int max77693_safeout_table[] = {
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4850000,
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4900000,
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4950000,
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3300000,
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};
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static struct regulator_ops max77693_safeout_ops = {
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.list_voltage = regulator_list_voltage_table,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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};
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static struct regulator_ops max77693_charger_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.get_current_limit = max77693_chg_get_current_limit,
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.set_current_limit = max77693_chg_set_current_limit,
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};
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#define max77693_regulator_desc_esafeout(_num) { \
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.name = "ESAFEOUT"#_num, \
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.id = MAX77693_ESAFEOUT##_num, \
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.of_match = of_match_ptr("ESAFEOUT"#_num), \
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.regulators_node = of_match_ptr("regulators"), \
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.n_voltages = 4, \
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.ops = &max77693_safeout_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.volt_table = max77693_safeout_table, \
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.vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
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.vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
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.enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
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.enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
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}
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static const struct regulator_desc max77693_supported_regulators[] = {
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max77693_regulator_desc_esafeout(1),
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max77693_regulator_desc_esafeout(2),
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{
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.name = "CHARGER",
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.id = MAX77693_CHARGER,
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.of_match = of_match_ptr("CHARGER"),
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.regulators_node = of_match_ptr("regulators"),
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.ops = &max77693_charger_ops,
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.type = REGULATOR_CURRENT,
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.owner = THIS_MODULE,
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.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
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.enable_mask = CHG_CNFG_00_CHG_MASK |
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CHG_CNFG_00_BUCK_MASK,
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.enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
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},
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};
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static const struct chg_reg_data max77693_chg_reg_data = {
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.linear_reg = MAX77693_CHG_REG_CHG_CNFG_09,
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.linear_mask = CHG_CNFG_09_CHGIN_ILIM_MASK,
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.uA_step = 20000,
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.min_sel = 3,
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};
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#define max77843_regulator_desc_esafeout(num) { \
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.name = "SAFEOUT" # num, \
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.id = MAX77843_SAFEOUT ## num, \
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.ops = &max77693_safeout_ops, \
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.of_match = of_match_ptr("SAFEOUT" # num), \
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.regulators_node = of_match_ptr("regulators"), \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.n_voltages = ARRAY_SIZE(max77693_safeout_table), \
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.volt_table = max77693_safeout_table, \
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.enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \
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.enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \
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.vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \
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.vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
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}
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static const struct regulator_desc max77843_supported_regulators[] = {
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[MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
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[MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
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[MAX77843_CHARGER] = {
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.name = "CHARGER",
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.id = MAX77843_CHARGER,
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.ops = &max77693_charger_ops,
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.of_match = of_match_ptr("CHARGER"),
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.regulators_node = of_match_ptr("regulators"),
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.type = REGULATOR_CURRENT,
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.owner = THIS_MODULE,
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.enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
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.enable_mask = MAX77843_CHG_MASK,
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.enable_val = MAX77843_CHG_MASK,
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},
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};
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static const struct chg_reg_data max77843_chg_reg_data = {
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.linear_reg = MAX77843_CHG_REG_CHG_CNFG_02,
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.linear_mask = MAX77843_CHG_FAST_CHG_CURRENT_MASK,
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.uA_step = MAX77843_CHG_FAST_CHG_CURRENT_STEP,
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.min_sel = 2,
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};
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static int max77693_pmic_probe(struct platform_device *pdev)
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{
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enum max77693_types type = platform_get_device_id(pdev)->driver_data;
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struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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const struct regulator_desc *regulators;
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unsigned int regulators_size;
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int i;
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struct regulator_config config = { };
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config.dev = iodev->dev;
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switch (type) {
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case TYPE_MAX77693:
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regulators = max77693_supported_regulators;
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regulators_size = ARRAY_SIZE(max77693_supported_regulators);
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config.driver_data = (void *)&max77693_chg_reg_data;
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break;
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case TYPE_MAX77843:
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regulators = max77843_supported_regulators;
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regulators_size = ARRAY_SIZE(max77843_supported_regulators);
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config.driver_data = (void *)&max77843_chg_reg_data;
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break;
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default:
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dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
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return -ENODEV;
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}
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for (i = 0; i < regulators_size; i++) {
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struct regulator_dev *rdev;
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config.regmap = max77693_get_regmap(type, iodev,
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regulators[i].id);
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rdev = devm_regulator_register(&pdev->dev,
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®ulators[i], &config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev,
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"Failed to initialize regulator-%d\n", i);
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return PTR_ERR(rdev);
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}
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}
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return 0;
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}
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static const struct platform_device_id max77693_pmic_id[] = {
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{ "max77693-pmic", TYPE_MAX77693 },
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{ "max77843-regulator", TYPE_MAX77843 },
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{},
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};
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MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
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static struct platform_driver max77693_pmic_driver = {
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.driver = {
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.name = "max77693-pmic",
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},
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.probe = max77693_pmic_probe,
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.id_table = max77693_pmic_id,
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};
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static int __init max77693_pmic_init(void)
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{
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return platform_driver_register(&max77693_pmic_driver);
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}
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subsys_initcall(max77693_pmic_init);
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static void __exit max77693_pmic_cleanup(void)
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{
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platform_driver_unregister(&max77693_pmic_driver);
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}
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module_exit(max77693_pmic_cleanup);
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MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
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MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
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MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
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MODULE_LICENSE("GPL");
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