diff options
Diffstat (limited to 'drivers/regulator/max77693.c')
| -rw-r--r-- | drivers/regulator/max77693.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c new file mode 100644 index 000000000000..ce4b96c15eba --- /dev/null +++ b/drivers/regulator/max77693.c @@ -0,0 +1,322 @@ +/* + * max77693.c - Regulator driver for the Maxim 77693 + * + * Copyright (C) 2013 Samsung Electronics + * Jonghwa Lee <jonghwa3.lee@samsung.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-private.h> +#include <linux/regulator/of_regulator.h> + +#define CHGIN_ILIM_STEP_20mA 20000 + +struct max77693_pmic_dev { + struct device *dev; + struct max77693_dev *iodev; + int num_regulators; + struct regulator_dev **rdev; +}; + +/* CHARGER regulator ops */ +/* CHARGER regulator uses two bits for enabling */ +static int max77693_chg_is_enabled(struct regulator_dev *rdev) +{ + int ret; + u8 val; + + ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val); + if (ret) + return ret; + + return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask; +} + +/* + * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA + * 0x00, 0x01, 0x2, 0x03 = 60 mA + * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA + */ +static int max77693_chg_get_current_limit(struct regulator_dev *rdev) +{ + unsigned int chg_min_uA = rdev->constraints->min_uA; + unsigned int chg_max_uA = rdev->constraints->max_uA; + u8 reg, sel; + unsigned int val; + int ret; + + ret = max77693_read_reg(rdev->regmap, + MAX77693_CHG_REG_CHG_CNFG_09, ®); + if (ret < 0) + return ret; + + sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK; + + /* the first four codes for charger current are all 60mA */ + if (sel <= 3) + sel = 0; + else + sel -= 3; + + val = chg_min_uA + CHGIN_ILIM_STEP_20mA * 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) +{ + unsigned int chg_min_uA = rdev->constraints->min_uA; + int sel = 0; + + while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA) + sel++; + + if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA) + return -EINVAL; + + /* the first four codes for charger current are all 60mA */ + sel += 3; + + return max77693_write_reg(rdev->regmap, + MAX77693_CHG_REG_CHG_CNFG_09, sel); +} +/* end of CHARGER regulator ops */ + +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 = max77693_chg_is_enabled, + .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 regulator_desc_esafeout(_num) { \ + .name = "ESAFEOUT"#_num, \ + .id = MAX77693_ESAFEOUT##_num, \ + .n_voltages = 4, \ + .ops = &max77693_safeout_ops, \ + .type = REGULATOR_VOLTAGE, \ + .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 struct regulator_desc regulators[] = { + regulator_desc_esafeout(1), + regulator_desc_esafeout(2), + { + .name = "CHARGER", + .id = MAX77693_CHARGER, + .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, + }, +}; + +#ifdef CONFIG_OF +static int max77693_pmic_dt_parse_rdata(struct device *dev, + struct max77693_regulator_data **rdata) +{ + struct device_node *np; + struct of_regulator_match *rmatch; + struct max77693_regulator_data *tmp; + int i, matched = 0; + + np = of_find_node_by_name(dev->parent->of_node, "regulators"); + if (!np) + return -EINVAL; + + rmatch = devm_kzalloc(dev, + sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL); + if (!rmatch) + return -ENOMEM; + + for (i = 0; i < ARRAY_SIZE(regulators); i++) + rmatch[i].name = regulators[i].name; + + matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators)); + if (matched <= 0) + return matched; + *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL); + if (!(*rdata)) + return -ENOMEM; + + tmp = *rdata; + + for (i = 0; i < matched; i++) { + tmp->initdata = rmatch[i].init_data; + tmp->of_node = rmatch[i].of_node; + tmp->id = regulators[i].id; + tmp++; + } + + return matched; +} +#else +static int max77693_pmic_dt_parse_rdata(struct device *dev, + struct max77693_regulator_data **rdata) +{ + return 0; +} +#endif /* CONFIG_OF */ + +static int max77693_pmic_init_rdata(struct device *dev, + struct max77693_regulator_data **rdata) +{ + struct max77693_platform_data *pdata; + int num_regulators = 0; + + pdata = dev_get_platdata(dev->parent); + if (pdata) { + *rdata = pdata->regulators; + num_regulators = pdata->num_regulators; + } + + if (!(*rdata) && dev->parent->of_node) + num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata); + + return num_regulators; +} + +static int max77693_pmic_probe(struct platform_device *pdev) +{ + struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent); + struct max77693_pmic_dev *max77693_pmic; + struct max77693_regulator_data *rdata = NULL; + int num_rdata, i, ret; + struct regulator_config config; + + num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata); + if (!rdata || num_rdata <= 0) { + dev_err(&pdev->dev, "No init data supplied.\n"); + return -ENODEV; + } + + max77693_pmic = devm_kzalloc(&pdev->dev, + sizeof(struct max77693_pmic_dev), + GFP_KERNEL); + if (!max77693_pmic) + return -ENOMEM; + + max77693_pmic->rdev = devm_kzalloc(&pdev->dev, + sizeof(struct regulator_dev *) * num_rdata, + GFP_KERNEL); + if (!max77693_pmic->rdev) + return -ENOMEM; + + max77693_pmic->dev = &pdev->dev; + max77693_pmic->iodev = iodev; + max77693_pmic->num_regulators = num_rdata; + + config.dev = &pdev->dev; + config.regmap = iodev->regmap; + config.driver_data = max77693_pmic; + platform_set_drvdata(pdev, max77693_pmic); + + for (i = 0; i < max77693_pmic->num_regulators; i++) { + int id = rdata[i].id; + + config.init_data = rdata[i].initdata; + config.of_node = rdata[i].of_node; + + max77693_pmic->rdev[i] = regulator_register(®ulators[id], + &config); + if (IS_ERR(max77693_pmic->rdev[i])) { + ret = PTR_ERR(max77693_pmic->rdev[i]); + dev_err(max77693_pmic->dev, + "Failed to initialize regulator-%d\n", id); + max77693_pmic->rdev[i] = NULL; + goto err; + } + } + + return 0; + err: + while (--i >= 0) + regulator_unregister(max77693_pmic->rdev[i]); + + return ret; +} + +static int max77693_pmic_remove(struct platform_device *pdev) +{ + struct max77693_pmic_dev *max77693_pmic = platform_get_drvdata(pdev); + struct regulator_dev **rdev = max77693_pmic->rdev; + int i; + + for (i = 0; i < max77693_pmic->num_regulators; i++) + if (rdev[i]) + regulator_unregister(rdev[i]); + + return 0; +} + +static const struct platform_device_id max77693_pmic_id[] = { + {"max77693-pmic", 0}, + {}, +}; + +MODULE_DEVICE_TABLE(platform, max77693_pmic_id); + +static struct platform_driver max77693_pmic_driver = { + .driver = { + .name = "max77693-pmic", + .owner = THIS_MODULE, + }, + .probe = max77693_pmic_probe, + .remove = max77693_pmic_remove, + .id_table = max77693_pmic_id, +}; + +module_platform_driver(max77693_pmic_driver); + +MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver"); +MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); +MODULE_LICENSE("GPL"); |