Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 304 insertions, 0 deletions

diff --git a/drivers/regulator/max77693-regulator.c b/drivers/regulator/max77693-regulator.c
new file mode 100644
index 000000000..077ecbbfd
--- /dev/null
+++ b/drivers/regulator/max77693-regulator.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// max77693.c - Regulator driver for the Maxim 77693 and 77843
+//
+// Copyright (C) 2013-2015 Samsung Electronics
+// Jonghwa Lee <jonghwa3.lee@samsung.com>
+// Krzysztof Kozlowski <krzk@kernel.org>
+//
+// 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, &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 const 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 const 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,
+						&regulators[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 <krzk@kernel.org>");
+MODULE_LICENSE("GPL");