280 lines
7.1 KiB
C
280 lines
7.1 KiB
C
/*
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* max77693.c - Regulator driver for the Maxim 77693
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*
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* Copyright (C) 2013 Samsung Electronics
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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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-private.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regmap.h>
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#define CHGIN_ILIM_STEP_20mA 20000
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/* CHARGER regulator ops */
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/* CHARGER regulator uses two bits for enabling */
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static int max77693_chg_is_enabled(struct regulator_dev *rdev)
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{
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int ret;
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unsigned int val;
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ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
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if (ret)
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return ret;
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return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
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}
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/*
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* 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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*/
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static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
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{
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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, MAX77693_CHG_REG_CHG_CNFG_09, ®);
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if (ret < 0)
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return ret;
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sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
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/* the first four codes for charger current are all 60mA */
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if (sel <= 3)
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sel = 0;
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else
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sel -= 3;
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val = chg_min_uA + CHGIN_ILIM_STEP_20mA * 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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unsigned int chg_min_uA = rdev->constraints->min_uA;
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int sel = 0;
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while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
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sel++;
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if (chg_min_uA + CHGIN_ILIM_STEP_20mA * 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 += 3;
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return regmap_write(rdev->regmap,
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MAX77693_CHG_REG_CHG_CNFG_09, sel);
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}
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/* end of CHARGER regulator ops */
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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 = max77693_chg_is_enabled,
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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 regulator_desc_esafeout(_num) { \
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.name = "ESAFEOUT"#_num, \
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.id = MAX77693_ESAFEOUT##_num, \
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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 regulators[] = {
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regulator_desc_esafeout(1),
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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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.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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},
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};
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#ifdef CONFIG_OF
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static int max77693_pmic_dt_parse_rdata(struct device *dev,
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struct max77693_regulator_data **rdata)
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{
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struct device_node *np;
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struct of_regulator_match *rmatch;
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struct max77693_regulator_data *tmp;
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int i, matched = 0;
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np = of_get_child_by_name(dev->parent->of_node, "regulators");
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if (!np)
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return -EINVAL;
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rmatch = devm_kzalloc(dev,
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sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
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if (!rmatch) {
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of_node_put(np);
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return -ENOMEM;
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}
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for (i = 0; i < ARRAY_SIZE(regulators); i++)
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rmatch[i].name = regulators[i].name;
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matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
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of_node_put(np);
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if (matched <= 0)
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return matched;
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*rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
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if (!(*rdata))
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return -ENOMEM;
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tmp = *rdata;
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for (i = 0; i < matched; i++) {
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tmp->initdata = rmatch[i].init_data;
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tmp->of_node = rmatch[i].of_node;
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tmp->id = regulators[i].id;
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tmp++;
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}
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return matched;
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}
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#else
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static int max77693_pmic_dt_parse_rdata(struct device *dev,
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struct max77693_regulator_data **rdata)
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{
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return 0;
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}
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#endif /* CONFIG_OF */
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static int max77693_pmic_init_rdata(struct device *dev,
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struct max77693_regulator_data **rdata)
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{
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struct max77693_platform_data *pdata;
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int num_regulators = 0;
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pdata = dev_get_platdata(dev->parent);
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if (pdata) {
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*rdata = pdata->regulators;
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num_regulators = pdata->num_regulators;
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}
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if (!(*rdata) && dev->parent->of_node)
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num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
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return num_regulators;
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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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struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct max77693_regulator_data *rdata = NULL;
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int num_rdata, i;
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struct regulator_config config = { };
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num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
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if (!rdata || num_rdata <= 0) {
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dev_err(&pdev->dev, "No init data supplied.\n");
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return -ENODEV;
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}
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config.dev = &pdev->dev;
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config.regmap = iodev->regmap;
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for (i = 0; i < num_rdata; i++) {
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int id = rdata[i].id;
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struct regulator_dev *rdev;
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config.init_data = rdata[i].initdata;
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config.of_node = rdata[i].of_node;
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rdev = devm_regulator_register(&pdev->dev,
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®ulators[id], &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", id);
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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", 0},
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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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module_platform_driver(max77693_pmic_driver);
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MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
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MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
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MODULE_LICENSE("GPL");
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