From 80b022e29bfdffb6c9ac0a283bcad3e1030c4c7e Mon Sep 17 00:00:00 2001 From: Jonghwa Lee Date: Tue, 25 Jun 2013 10:08:38 +0900 Subject: regulator: max77693: Add max77693 regualtor driver. This patch adds new regulator driver to support max77693 chip's regulators. max77693 has two linear voltage regulators and one current regulator which can be controlled through I2C bus. This driver also supports device tree. Signed-off-by: Jonghwa Lee Signed-off-by: Myungjoo Ham Signed-off-by: Mark Brown --- drivers/regulator/Kconfig | 9 ++ drivers/regulator/Makefile | 1 + drivers/regulator/max77693.c | 324 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 334 insertions(+) create mode 100644 drivers/regulator/max77693.c (limited to 'drivers/regulator') diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 8bb26446037e..9744437afe32 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -250,6 +250,15 @@ config REGULATOR_MAX77686 via I2C bus. The provided regulator is suitable for Exynos-4 chips to control VARM and VINT voltages. +config REGULATOR_MAX77693 + tristate "Maxim MAX77693 regulator" + depends on MFD_MAX77693 + help + This driver controls a Maxim 77693 regulator via I2C bus. + The regulators include two LDOs, 'SAFEOUT1', 'SAFEOUT2' + and one current regulator 'CHARGER'. This is suitable for + Exynos-4x12 chips. + config REGULATOR_PCAP tristate "Motorola PCAP2 regulator driver" depends on EZX_PCAP diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 47a34ff88f98..a4094cd274be 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -41,6 +41,7 @@ obj-$(CONFIG_REGULATOR_MAX8973) += max8973-regulator.o obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o +obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c new file mode 100644 index 000000000000..674ece7c832b --- /dev/null +++ b/drivers/regulator/max77693.c @@ -0,0 +1,324 @@ +/* + * max77693.c - Regulator driver for the Maxim 77693 + * + * Copyright (C) 2013 Samsung Electronics + * Jonghwa Lee + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 < ARRAY_SIZE(regulators); i++) { + if (!rmatch[i].init_data) + continue; + 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 "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3 From f3ecdd7bf6a782a6eafe9c2c5d39fcb487e2a154 Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Sat, 29 Jun 2013 11:37:29 +0800 Subject: regulator: max77693: Fix trivial typo Fix trivial typo in the equation to check upper bound of current setting. Signed-off-by: Axel Lin Acked-by: Jonghwa Lee Signed-off-by: Mark Brown --- drivers/regulator/max77693.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/regulator') diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c index 674ece7c832b..d45a4dd17131 100644 --- a/drivers/regulator/max77693.c +++ b/drivers/regulator/max77693.c @@ -97,7 +97,7 @@ static int max77693_chg_set_current_limit(struct regulator_dev *rdev, while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA) sel++; - if (chg_min_uA * CHGIN_ILIM_STEP_20mA * sel > max_uA) + if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA) return -EINVAL; /* the first four codes for charger current are all 60mA */ -- cgit v1.2.3 From 8c7e7ddf31ca9943b70e58d1c47d059beda435bd Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Sun, 30 Jun 2013 00:33:52 +0800 Subject: regulator: max77693: Remove NULL test for rmatch[i].init_data The implementation in of_regulator_match() already ensures match->init_data is not NULL for all matched cases if the return value of of_regulator_match() > 0. Thus remove NULL test for rmatch[i].init_data. This patch also fixes the condition for loop iteration. The for loop should iterate "matched" times rather than ARRAY_SIZE(regulators) because we only allocate "matched" number of entries for rdata. Though in most cases, "matched" == ARRAY_SIZE(regulators). Signed-off-by: Axel Lin Acked-by: Jonghwa Lee Signed-off-by: Mark Brown --- drivers/regulator/max77693.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'drivers/regulator') diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c index d45a4dd17131..ce4b96c15eba 100644 --- a/drivers/regulator/max77693.c +++ b/drivers/regulator/max77693.c @@ -190,9 +190,7 @@ static int max77693_pmic_dt_parse_rdata(struct device *dev, tmp = *rdata; - for (i = 0; i < ARRAY_SIZE(regulators); i++) { - if (!rmatch[i].init_data) - continue; + for (i = 0; i < matched; i++) { tmp->initdata = rmatch[i].init_data; tmp->of_node = rmatch[i].of_node; tmp->id = regulators[i].id; -- cgit v1.2.3