[linux-2.6-block.git] / drivers / regulator / max77650-regulator.c

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 BayLibre SAS
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
//
// Regulator driver for MAXIM 77650/77651 charger/power-supply.

#include <linux/of.h>
#include <linux/mfd/max77650.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>

#define MAX77650_REGULATOR_EN_CTRL_MASK		GENMASK(3, 0)
#define MAX77650_REGULATOR_EN_CTRL_BITS(_reg) \
		((_reg) & MAX77650_REGULATOR_EN_CTRL_MASK)
#define MAX77650_REGULATOR_ENABLED		GENMASK(2, 1)
#define MAX77650_REGULATOR_DISABLED		BIT(2)

#define MAX77650_REGULATOR_V_LDO_MASK		GENMASK(6, 0)
#define MAX77650_REGULATOR_V_SBB_MASK		GENMASK(5, 0)

#define MAX77650_REGULATOR_AD_MASK		BIT(3)
#define MAX77650_REGULATOR_AD_DISABLED		0x00
#define MAX77650_REGULATOR_AD_ENABLED		BIT(3)

#define MAX77650_REGULATOR_CURR_LIM_MASK	GENMASK(7, 6)
#define MAX77650_REGULATOR_CURR_LIM_BITS(_reg) \
		(((_reg) & MAX77650_REGULATOR_CURR_LIM_MASK) >> 6)
#define MAX77650_REGULATOR_CURR_LIM_SHIFT(_val)	((_val) << 6)

enum {
	MAX77650_REGULATOR_ID_LDO = 0,
	MAX77650_REGULATOR_ID_SBB0,
	MAX77650_REGULATOR_ID_SBB1,
	MAX77650_REGULATOR_ID_SBB2,
	MAX77650_REGULATOR_NUM_REGULATORS,
};

struct max77650_regulator_desc {
	struct regulator_desc desc;
	unsigned int regA;
	unsigned int regB;
};

static const u32 max77651_sbb1_regulator_volt_table[] = {
	2400000, 3200000, 4000000, 4800000,
	2450000, 3250000, 4050000, 4850000,
	2500000, 3300000, 4100000, 4900000,
	2550000, 3350000, 4150000, 4950000,
	2600000, 3400000, 4200000, 5000000,
	2650000, 3450000, 4250000, 5050000,
	2700000, 3500000, 4300000, 5100000,
	2750000, 3550000, 4350000, 5150000,
	2800000, 3600000, 4400000, 5200000,
	2850000, 3650000, 4450000, 5250000,
	2900000, 3700000, 4500000,       0,
	2950000, 3750000, 4550000,       0,
	3000000, 3800000, 4600000,       0,
	3050000, 3850000, 4650000,       0,
	3100000, 3900000, 4700000,       0,
	3150000, 3950000, 4750000,       0,
};

#define MAX77651_REGULATOR_SBB1_SEL_DEC(_val) \
		(((_val & 0x3c) >> 2) | ((_val & 0x03) << 4))
#define MAX77651_REGULATOR_SBB1_SEL_ENC(_val) \
		(((_val & 0x30) >> 4) | ((_val & 0x0f) << 2))

#define MAX77650_REGULATOR_SBB1_SEL_DECR(_val)				\
	do {								\
		_val = MAX77651_REGULATOR_SBB1_SEL_DEC(_val);		\
		_val--;							\
		_val = MAX77651_REGULATOR_SBB1_SEL_ENC(_val);		\
	} while (0)

#define MAX77650_REGULATOR_SBB1_SEL_INCR(_val)				\
	do {								\
		_val = MAX77651_REGULATOR_SBB1_SEL_DEC(_val);		\
		_val++;							\
		_val = MAX77651_REGULATOR_SBB1_SEL_ENC(_val);		\
	} while (0)

static const int max77650_current_limit_table[] = {
	1000000, 866000, 707000, 500000,
};

static int max77650_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct max77650_regulator_desc *rdesc;
	struct regmap *map;
	int val, rv, en;

	rdesc = rdev_get_drvdata(rdev);
	map = rdev_get_regmap(rdev);

	rv = regmap_read(map, rdesc->regB, &val);
	if (rv)
		return rv;

	en = MAX77650_REGULATOR_EN_CTRL_BITS(val);

	return en != MAX77650_REGULATOR_DISABLED;
}

static int max77650_regulator_enable(struct regulator_dev *rdev)
{
	struct max77650_regulator_desc *rdesc;
	struct regmap *map;

	rdesc = rdev_get_drvdata(rdev);
	map = rdev_get_regmap(rdev);

	return regmap_update_bits(map, rdesc->regB,
				  MAX77650_REGULATOR_EN_CTRL_MASK,
				  MAX77650_REGULATOR_ENABLED);
}

static int max77650_regulator_disable(struct regulator_dev *rdev)
{
	struct max77650_regulator_desc *rdesc;
	struct regmap *map;

	rdesc = rdev_get_drvdata(rdev);
	map = rdev_get_regmap(rdev);

	return regmap_update_bits(map, rdesc->regB,
				  MAX77650_REGULATOR_EN_CTRL_MASK,
				  MAX77650_REGULATOR_DISABLED);
}

static int max77650_regulator_set_voltage_sel(struct regulator_dev *rdev,
					      unsigned int sel)
{
	int rv = 0, curr, diff;
	bool ascending;

	/*
	 * If the regulator is disabled, we can program the desired
	 * voltage right away.
	 */
	if (!max77650_regulator_is_enabled(rdev))
		return regulator_set_voltage_sel_regmap(rdev, sel);

	/*
	 * Otherwise we need to manually ramp the output voltage up/down
	 * one step at a time.
	 */

	curr = regulator_get_voltage_sel_regmap(rdev);
	if (curr < 0)
		return curr;

	diff = curr - sel;
	if (diff == 0)
		return 0; /* Already there. */
	else if (diff > 0)
		ascending = false;
	else
		ascending = true;

	/*
	 * Make sure we'll get to the right voltage and break the loop even if
	 * the selector equals 0.
	 */
	for (ascending ? curr++ : curr--;; ascending ? curr++ : curr--) {
		rv = regulator_set_voltage_sel_regmap(rdev, curr);
		if (rv)
			return rv;

		if (curr == sel)
			break;
	}

	return 0;
}

/*
 * Special case: non-linear voltage table for max77651 SBB1 - software
 * must ensure the voltage is ramped in 50mV increments.
 */
static int max77651_regulator_sbb1_set_voltage_sel(struct regulator_dev *rdev,
						   unsigned int sel)
{
	int rv = 0, curr, vcurr, vdest, vdiff;

	/*
	 * If the regulator is disabled, we can program the desired
	 * voltage right away.
	 */
	if (!max77650_regulator_is_enabled(rdev))
		return regulator_set_voltage_sel_regmap(rdev, sel);

	curr = regulator_get_voltage_sel_regmap(rdev);
	if (curr < 0)
		return curr;

	if (curr == sel)
		return 0; /* Already there. */

	vcurr = max77651_sbb1_regulator_volt_table[curr];
	vdest = max77651_sbb1_regulator_volt_table[sel];
	vdiff = vcurr - vdest;

	for (;;) {
		if (vdiff > 0)
			MAX77650_REGULATOR_SBB1_SEL_DECR(curr);
		else
			MAX77650_REGULATOR_SBB1_SEL_INCR(curr);

		rv = regulator_set_voltage_sel_regmap(rdev, curr);
		if (rv)
			return rv;

		if (curr == sel)
			break;
	};

	return 0;
}

static int max77650_regulator_get_current_limit(struct regulator_dev *rdev)
{
	struct max77650_regulator_desc *rdesc;
	struct regmap *map;
	int val, rv, limit;

	rdesc = rdev_get_drvdata(rdev);
	map = rdev_get_regmap(rdev);

	rv = regmap_read(map, rdesc->regA, &val);
	if (rv)
		return rv;

	limit = MAX77650_REGULATOR_CURR_LIM_BITS(val);

	return max77650_current_limit_table[limit];
}

static int max77650_regulator_set_current_limit(struct regulator_dev *rdev,
						int min_uA, int max_uA)
{
	struct max77650_regulator_desc *rdesc;
	struct regmap *map;
	int i, limit;

	rdesc = rdev_get_drvdata(rdev);
	map = rdev_get_regmap(rdev);

	for (i = 0; i < ARRAY_SIZE(max77650_current_limit_table); i++) {
		limit = max77650_current_limit_table[i];

		if (limit >= min_uA && limit <= max_uA) {
			return regmap_update_bits(map, rdesc->regA,
					MAX77650_REGULATOR_CURR_LIM_MASK,
					MAX77650_REGULATOR_CURR_LIM_SHIFT(i));
		}
	}

	return -EINVAL;
}

static const struct regulator_ops max77650_regulator_LDO_ops = {
	.is_enabled		= max77650_regulator_is_enabled,
	.enable			= max77650_regulator_enable,
	.disable		= max77650_regulator_disable,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= max77650_regulator_set_voltage_sel,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
};

static const struct regulator_ops max77650_regulator_SBB_ops = {
	.is_enabled		= max77650_regulator_is_enabled,
	.enable			= max77650_regulator_enable,
	.disable		= max77650_regulator_disable,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= max77650_regulator_set_voltage_sel,
	.get_current_limit	= max77650_regulator_get_current_limit,
	.set_current_limit	= max77650_regulator_set_current_limit,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
};

/* Special case for max77651 SBB1 - non-linear voltage mapping. */
static const struct regulator_ops max77651_SBB1_regulator_ops = {
	.is_enabled		= max77650_regulator_is_enabled,
	.enable			= max77650_regulator_enable,
	.disable		= max77650_regulator_disable,
	.list_voltage		= regulator_list_voltage_table,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= max77651_regulator_sbb1_set_voltage_sel,
	.get_current_limit	= max77650_regulator_get_current_limit,
	.set_current_limit	= max77650_regulator_set_current_limit,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
};

static struct max77650_regulator_desc max77650_LDO_desc = {
	.desc = {
		.name			= "ldo",
		.of_match		= of_match_ptr("ldo"),
		.regulators_node	= of_match_ptr("regulators"),
		.supply_name		= "in-ldo",
		.id			= MAX77650_REGULATOR_ID_LDO,
		.ops			= &max77650_regulator_LDO_ops,
		.min_uV			= 1350000,
		.uV_step		= 12500,
		.n_voltages		= 128,
		.vsel_mask		= MAX77650_REGULATOR_V_LDO_MASK,
		.vsel_reg		= MAX77650_REG_CNFG_LDO_A,
		.active_discharge_off	= MAX77650_REGULATOR_AD_DISABLED,
		.active_discharge_on	= MAX77650_REGULATOR_AD_ENABLED,
		.active_discharge_mask	= MAX77650_REGULATOR_AD_MASK,
		.active_discharge_reg	= MAX77650_REG_CNFG_LDO_B,
		.enable_time		= 100,
		.type			= REGULATOR_VOLTAGE,
		.owner			= THIS_MODULE,
	},
	.regA		= MAX77650_REG_CNFG_LDO_A,
	.regB		= MAX77650_REG_CNFG_LDO_B,
};

static struct max77650_regulator_desc max77650_SBB0_desc = {
	.desc = {
		.name			= "sbb0",
		.of_match		= of_match_ptr("sbb0"),
		.regulators_node	= of_match_ptr("regulators"),
		.supply_name		= "in-sbb0",
		.id			= MAX77650_REGULATOR_ID_SBB0,
		.ops			= &max77650_regulator_SBB_ops,
		.min_uV			= 800000,
		.uV_step		= 25000,
		.n_voltages		= 64,
		.vsel_mask		= MAX77650_REGULATOR_V_SBB_MASK,
		.vsel_reg		= MAX77650_REG_CNFG_SBB0_A,
		.active_discharge_off	= MAX77650_REGULATOR_AD_DISABLED,
		.active_discharge_on	= MAX77650_REGULATOR_AD_ENABLED,
		.active_discharge_mask	= MAX77650_REGULATOR_AD_MASK,
		.active_discharge_reg	= MAX77650_REG_CNFG_SBB0_B,
		.enable_time		= 100,
		.type			= REGULATOR_VOLTAGE,
		.owner			= THIS_MODULE,
	},
	.regA		= MAX77650_REG_CNFG_SBB0_A,
	.regB		= MAX77650_REG_CNFG_SBB0_B,
};

static struct max77650_regulator_desc max77650_SBB1_desc = {
	.desc = {
		.name			= "sbb1",
		.of_match		= of_match_ptr("sbb1"),
		.regulators_node	= of_match_ptr("regulators"),
		.supply_name		= "in-sbb1",
		.id			= MAX77650_REGULATOR_ID_SBB1,
		.ops			= &max77650_regulator_SBB_ops,
		.min_uV			= 800000,
		.uV_step		= 12500,
		.n_voltages		= 64,
		.vsel_mask		= MAX77650_REGULATOR_V_SBB_MASK,
		.vsel_reg		= MAX77650_REG_CNFG_SBB1_A,
		.active_discharge_off	= MAX77650_REGULATOR_AD_DISABLED,
		.active_discharge_on	= MAX77650_REGULATOR_AD_ENABLED,
		.active_discharge_mask	= MAX77650_REGULATOR_AD_MASK,
		.active_discharge_reg	= MAX77650_REG_CNFG_SBB1_B,
		.enable_time		= 100,
		.type			= REGULATOR_VOLTAGE,
		.owner			= THIS_MODULE,
	},
	.regA		= MAX77650_REG_CNFG_SBB1_A,
	.regB		= MAX77650_REG_CNFG_SBB1_B,
};

static struct max77650_regulator_desc max77651_SBB1_desc = {
	.desc = {
		.name			= "sbb1",
		.of_match		= of_match_ptr("sbb1"),
		.regulators_node	= of_match_ptr("regulators"),
		.supply_name		= "in-sbb1",
		.id			= MAX77650_REGULATOR_ID_SBB1,
		.ops			= &max77651_SBB1_regulator_ops,
		.volt_table		= max77651_sbb1_regulator_volt_table,
		.n_voltages = ARRAY_SIZE(max77651_sbb1_regulator_volt_table),
		.vsel_mask		= MAX77650_REGULATOR_V_SBB_MASK,
		.vsel_reg		= MAX77650_REG_CNFG_SBB1_A,
		.active_discharge_off	= MAX77650_REGULATOR_AD_DISABLED,
		.active_discharge_on	= MAX77650_REGULATOR_AD_ENABLED,
		.active_discharge_mask	= MAX77650_REGULATOR_AD_MASK,
		.active_discharge_reg	= MAX77650_REG_CNFG_SBB1_B,
		.enable_time		= 100,
		.type			= REGULATOR_VOLTAGE,
		.owner			= THIS_MODULE,
	},
	.regA		= MAX77650_REG_CNFG_SBB1_A,
	.regB		= MAX77650_REG_CNFG_SBB1_B,
};

static struct max77650_regulator_desc max77650_SBB2_desc = {
	.desc = {
		.name			= "sbb2",
		.of_match		= of_match_ptr("sbb2"),
		.regulators_node	= of_match_ptr("regulators"),
		.supply_name		= "in-sbb0",
		.id			= MAX77650_REGULATOR_ID_SBB2,
		.ops			= &max77650_regulator_SBB_ops,
		.min_uV			= 800000,
		.uV_step		= 50000,
		.n_voltages		= 64,
		.vsel_mask		= MAX77650_REGULATOR_V_SBB_MASK,
		.vsel_reg		= MAX77650_REG_CNFG_SBB2_A,
		.active_discharge_off	= MAX77650_REGULATOR_AD_DISABLED,
		.active_discharge_on	= MAX77650_REGULATOR_AD_ENABLED,
		.active_discharge_mask	= MAX77650_REGULATOR_AD_MASK,
		.active_discharge_reg	= MAX77650_REG_CNFG_SBB2_B,
		.enable_time		= 100,
		.type			= REGULATOR_VOLTAGE,
		.owner			= THIS_MODULE,
	},
	.regA		= MAX77650_REG_CNFG_SBB2_A,
	.regB		= MAX77650_REG_CNFG_SBB2_B,
};

static struct max77650_regulator_desc max77651_SBB2_desc = {
	.desc = {
		.name			= "sbb2",
		.of_match		= of_match_ptr("sbb2"),
		.regulators_node	= of_match_ptr("regulators"),
		.supply_name		= "in-sbb0",
		.id			= MAX77650_REGULATOR_ID_SBB2,
		.ops			= &max77650_regulator_SBB_ops,
		.min_uV			= 2400000,
		.uV_step		= 50000,
		.n_voltages		= 64,
		.vsel_mask		= MAX77650_REGULATOR_V_SBB_MASK,
		.vsel_reg		= MAX77650_REG_CNFG_SBB2_A,
		.active_discharge_off	= MAX77650_REGULATOR_AD_DISABLED,
		.active_discharge_on	= MAX77650_REGULATOR_AD_ENABLED,
		.active_discharge_mask	= MAX77650_REGULATOR_AD_MASK,
		.active_discharge_reg	= MAX77650_REG_CNFG_SBB2_B,
		.enable_time		= 100,
		.type			= REGULATOR_VOLTAGE,
		.owner			= THIS_MODULE,
	},
	.regA		= MAX77650_REG_CNFG_SBB2_A,
	.regB		= MAX77650_REG_CNFG_SBB2_B,
};

static int max77650_regulator_probe(struct platform_device *pdev)
{
	struct max77650_regulator_desc **rdescs;
	struct max77650_regulator_desc *rdesc;
	struct regulator_config config = { };
	struct device *dev, *parent;
	struct regulator_dev *rdev;
	struct regmap *map;
	unsigned int val;
	int i, rv;

	dev = &pdev->dev;
	parent = dev->parent;

	if (!dev->of_node)
		dev->of_node = parent->of_node;

	rdescs = devm_kcalloc(dev, MAX77650_REGULATOR_NUM_REGULATORS,
			      sizeof(*rdescs), GFP_KERNEL);
	if (!rdescs)
		return -ENOMEM;

	map = dev_get_regmap(parent, NULL);
	if (!map)
		return -ENODEV;

	rv = regmap_read(map, MAX77650_REG_CID, &val);
	if (rv)
		return rv;

	rdescs[MAX77650_REGULATOR_ID_LDO] = &max77650_LDO_desc;
	rdescs[MAX77650_REGULATOR_ID_SBB0] = &max77650_SBB0_desc;

	switch (MAX77650_CID_BITS(val)) {
	case MAX77650_CID_77650A:
	case MAX77650_CID_77650C:
		rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77650_SBB1_desc;
		rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77650_SBB2_desc;
		break;
	case MAX77650_CID_77651A:
	case MAX77650_CID_77651B:
		rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77651_SBB1_desc;
		rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77651_SBB2_desc;
		break;
	default:
		return -ENODEV;
	}

	config.dev = parent;

	for (i = 0; i < MAX77650_REGULATOR_NUM_REGULATORS; i++) {
		rdesc = rdescs[i];
		config.driver_data = rdesc;

		rdev = devm_regulator_register(dev, &rdesc->desc, &config);
		if (IS_ERR(rdev))
			return PTR_ERR(rdev);
	}

	return 0;
}

static struct platform_driver max77650_regulator_driver = {
	.driver = {
		.name = "max77650-regulator",
	},
	.probe = max77650_regulator_probe,
};
module_platform_driver(max77650_regulator_driver);

MODULE_DESCRIPTION("MAXIM 77650/77651 regulator driver");
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
bcc61f1c BG	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// Copyright (C) 2018 BayLibre SAS
	4	// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
	5	//
	6	// Regulator driver for MAXIM 77650/77651 charger/power-supply.
	7
5358db54	8	#include <linux/of.h>
bcc61f1c BG	9	#include <linux/mfd/max77650.h>
	10	#include <linux/module.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/regmap.h>
	13	#include <linux/regulator/driver.h>
	14
	15	#define MAX77650_REGULATOR_EN_CTRL_MASK GENMASK(3, 0)
	16	#define MAX77650_REGULATOR_EN_CTRL_BITS(_reg) \
	17	((_reg) & MAX77650_REGULATOR_EN_CTRL_MASK)
	18	#define MAX77650_REGULATOR_ENABLED GENMASK(2, 1)
	19	#define MAX77650_REGULATOR_DISABLED BIT(2)
	20
	21	#define MAX77650_REGULATOR_V_LDO_MASK GENMASK(6, 0)
	22	#define MAX77650_REGULATOR_V_SBB_MASK GENMASK(5, 0)
	23
	24	#define MAX77650_REGULATOR_AD_MASK BIT(3)
	25	#define MAX77650_REGULATOR_AD_DISABLED 0x00
	26	#define MAX77650_REGULATOR_AD_ENABLED BIT(3)
	27
	28	#define MAX77650_REGULATOR_CURR_LIM_MASK GENMASK(7, 6)
	29	#define MAX77650_REGULATOR_CURR_LIM_BITS(_reg) \
	30	(((_reg) & MAX77650_REGULATOR_CURR_LIM_MASK) >> 6)
	31	#define MAX77650_REGULATOR_CURR_LIM_SHIFT(_val) ((_val) << 6)
	32
	33	enum {
	34	MAX77650_REGULATOR_ID_LDO = 0,
	35	MAX77650_REGULATOR_ID_SBB0,
	36	MAX77650_REGULATOR_ID_SBB1,
	37	MAX77650_REGULATOR_ID_SBB2,
	38	MAX77650_REGULATOR_NUM_REGULATORS,
	39	};
	40
	41	struct max77650_regulator_desc {
	42	struct regulator_desc desc;
	43	unsigned int regA;
	44	unsigned int regB;
	45	};
	46
	47	static const u32 max77651_sbb1_regulator_volt_table[] = {
	48	2400000, 3200000, 4000000, 4800000,
	49	2450000, 3250000, 4050000, 4850000,
	50	2500000, 3300000, 4100000, 4900000,
	51	2550000, 3350000, 4150000, 4950000,
	52	2600000, 3400000, 4200000, 5000000,
	53	2650000, 3450000, 4250000, 5050000,
	54	2700000, 3500000, 4300000, 5100000,
	55	2750000, 3550000, 4350000, 5150000,
	56	2800000, 3600000, 4400000, 5200000,
	57	2850000, 3650000, 4450000, 5250000,
	58	2900000, 3700000, 4500000, 0,
	59	2950000, 3750000, 4550000, 0,
	60	3000000, 3800000, 4600000, 0,
	61	3050000, 3850000, 4650000, 0,
	62	3100000, 3900000, 4700000, 0,
	63	3150000, 3950000, 4750000, 0,
	64	};
	65
	66	#define MAX77651_REGULATOR_SBB1_SEL_DEC(_val) \
	67	(((_val & 0x3c) >> 2) \| ((_val & 0x03) << 4))
	68	#define MAX77651_REGULATOR_SBB1_SEL_ENC(_val) \
	69	(((_val & 0x30) >> 4) \| ((_val & 0x0f) << 2))
	70
	71	#define MAX77650_REGULATOR_SBB1_SEL_DECR(_val) \
	72	do { \
73	_val = MAX77651_REGULATOR_SBB1_SEL_DEC(_val); \
74	_val--; \
75	_val = MAX77651_REGULATOR_SBB1_SEL_ENC(_val); \
76	} while (0)
77
78	#define MAX77650_REGULATOR_SBB1_SEL_INCR(_val) \
79	do { \
80	_val = MAX77651_REGULATOR_SBB1_SEL_DEC(_val); \
81	_val++; \
82	_val = MAX77651_REGULATOR_SBB1_SEL_ENC(_val); \
83	} while (0)
84
85	static const int max77650_current_limit_table[] = {
86	1000000, 866000, 707000, 500000,
87	};
88
89	static int max77650_regulator_is_enabled(struct regulator_dev *rdev)
90	{
91	struct max77650_regulator_desc *rdesc;
92	struct regmap *map;
93	int val, rv, en;
94
95	rdesc = rdev_get_drvdata(rdev);
96	map = rdev_get_regmap(rdev);
97
98	rv = regmap_read(map, rdesc->regB, &val);
99	if (rv)
100	return rv;
101
102	en = MAX77650_REGULATOR_EN_CTRL_BITS(val);
103
104	return en != MAX77650_REGULATOR_DISABLED;
105	}
106
107	static int max77650_regulator_enable(struct regulator_dev *rdev)
108	{
109	struct max77650_regulator_desc *rdesc;
110	struct regmap *map;
111
112	rdesc = rdev_get_drvdata(rdev);
113	map = rdev_get_regmap(rdev);
114
115	return regmap_update_bits(map, rdesc->regB,
116	MAX77650_REGULATOR_EN_CTRL_MASK,
117	MAX77650_REGULATOR_ENABLED);
118	}
119
120	static int max77650_regulator_disable(struct regulator_dev *rdev)
121	{
122	struct max77650_regulator_desc *rdesc;
123	struct regmap *map;
124
125	rdesc = rdev_get_drvdata(rdev);
126	map = rdev_get_regmap(rdev);
127
128	return regmap_update_bits(map, rdesc->regB,
129	MAX77650_REGULATOR_EN_CTRL_MASK,
130	MAX77650_REGULATOR_DISABLED);
131	}
132
133	static int max77650_regulator_set_voltage_sel(struct regulator_dev *rdev,
134	unsigned int sel)
135	{
136	int rv = 0, curr, diff;
137	bool ascending;
138
139	/*
140	* If the regulator is disabled, we can program the desired
141	* voltage right away.
142	*/
143	if (!max77650_regulator_is_enabled(rdev))
144	return regulator_set_voltage_sel_regmap(rdev, sel);
145
146	/*
147	* Otherwise we need to manually ramp the output voltage up/down
148	* one step at a time.
149	*/
150
151	curr = regulator_get_voltage_sel_regmap(rdev);
152	if (curr < 0)
153	return curr;
154
155	diff = curr - sel;
156	if (diff == 0)
157	return 0; /* Already there. */
158	else if (diff > 0)
159	ascending = false;
160	else
161	ascending = true;
162
163	/*
164	* Make sure we'll get to the right voltage and break the loop even if
165	* the selector equals 0.
166	*/
167	for (ascending ? curr++ : curr--;; ascending ? curr++ : curr--) {
168	rv = regulator_set_voltage_sel_regmap(rdev, curr);
169	if (rv)
170	return rv;
171
172	if (curr == sel)
173	break;
174	}
175
176	return 0;
177	}
178
179	/*
180	* Special case: non-linear voltage table for max77651 SBB1 - software
181	* must ensure the voltage is ramped in 50mV increments.
182	*/
183	static int max77651_regulator_sbb1_set_voltage_sel(struct regulator_dev *rdev,
184	unsigned int sel)
185	{
186	int rv = 0, curr, vcurr, vdest, vdiff;
187
188	/*
189	* If the regulator is disabled, we can program the desired
190	* voltage right away.
191	*/
192	if (!max77650_regulator_is_enabled(rdev))
193	return regulator_set_voltage_sel_regmap(rdev, sel);
194
195	curr = regulator_get_voltage_sel_regmap(rdev);
196	if (curr < 0)
197	return curr;
198
199	if (curr == sel)
200	return 0; /* Already there. */
201
202	vcurr = max77651_sbb1_regulator_volt_table[curr];
203	vdest = max77651_sbb1_regulator_volt_table[sel];
204	vdiff = vcurr - vdest;
205
206	for (;;) {
207	if (vdiff > 0)
208	MAX77650_REGULATOR_SBB1_SEL_DECR(curr);
209	else
210	MAX77650_REGULATOR_SBB1_SEL_INCR(curr);
211
212	rv = regulator_set_voltage_sel_regmap(rdev, curr);
213	if (rv)
214	return rv;
215
216	if (curr == sel)
217	break;
218	};
219
220	return 0;
221	}
222
223	static int max77650_regulator_get_current_limit(struct regulator_dev *rdev)
224	{
225	struct max77650_regulator_desc *rdesc;
226	struct regmap *map;
227	int val, rv, limit;
228
229	rdesc = rdev_get_drvdata(rdev);
230	map = rdev_get_regmap(rdev);
231
232	rv = regmap_read(map, rdesc->regA, &val);
233	if (rv)
234	return rv;
235
236	limit = MAX77650_REGULATOR_CURR_LIM_BITS(val);
237
238	return max77650_current_limit_table[limit];
239	}
240
241	static int max77650_regulator_set_current_limit(struct regulator_dev *rdev,
242	int min_uA, int max_uA)
243	{
244	struct max77650_regulator_desc *rdesc;
245	struct regmap *map;
d3d1a6a7	246	int i, limit;
bcc61f1c BG	247
	248	rdesc = rdev_get_drvdata(rdev);
	249	map = rdev_get_regmap(rdev);
	250
	251	for (i = 0; i < ARRAY_SIZE(max77650_current_limit_table); i++) {
	252	limit = max77650_current_limit_table[i];
	253
	254	if (limit >= min_uA && limit <= max_uA) {
d3d1a6a7	255	return regmap_update_bits(map, rdesc->regA,
bcc61f1c BG	256	MAX77650_REGULATOR_CURR_LIM_MASK,
bcc61f1c BG	257	MAX77650_REGULATOR_CURR_LIM_SHIFT(i));
bcc61f1c BG	258	}
	259	}
	260
	261	return -EINVAL;
	262	}
	263
	264	static const struct regulator_ops max77650_regulator_LDO_ops = {
	265	.is_enabled = max77650_regulator_is_enabled,
	266	.enable = max77650_regulator_enable,
	267	.disable = max77650_regulator_disable,
	268	.list_voltage = regulator_list_voltage_linear,
	269	.map_voltage = regulator_map_voltage_linear,
	270	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	271	.set_voltage_sel = max77650_regulator_set_voltage_sel,
	272	.set_active_discharge = regulator_set_active_discharge_regmap,
	273	};
	274
	275	static const struct regulator_ops max77650_regulator_SBB_ops = {
	276	.is_enabled = max77650_regulator_is_enabled,
	277	.enable = max77650_regulator_enable,
	278	.disable = max77650_regulator_disable,
	279	.list_voltage = regulator_list_voltage_linear,
	280	.map_voltage = regulator_map_voltage_linear,
	281	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	282	.set_voltage_sel = max77650_regulator_set_voltage_sel,
	283	.get_current_limit = max77650_regulator_get_current_limit,
	284	.set_current_limit = max77650_regulator_set_current_limit,
	285	.set_active_discharge = regulator_set_active_discharge_regmap,
	286	};
	287
	288	/* Special case for max77651 SBB1 - non-linear voltage mapping. */
	289	static const struct regulator_ops max77651_SBB1_regulator_ops = {
	290	.is_enabled = max77650_regulator_is_enabled,
	291	.enable = max77650_regulator_enable,
	292	.disable = max77650_regulator_disable,
	293	.list_voltage = regulator_list_voltage_table,
	294	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	295	.set_voltage_sel = max77651_regulator_sbb1_set_voltage_sel,
	296	.get_current_limit = max77650_regulator_get_current_limit,
	297	.set_current_limit = max77650_regulator_set_current_limit,
	298	.set_active_discharge = regulator_set_active_discharge_regmap,
	299	};
	300
	301	static struct max77650_regulator_desc max77650_LDO_desc = {
	302	.desc = {
	303	.name = "ldo",
	304	.of_match = of_match_ptr("ldo"),
	305	.regulators_node = of_match_ptr("regulators"),
	306	.supply_name = "in-ldo",
	307	.id = MAX77650_REGULATOR_ID_LDO,
	308	.ops = &max77650_regulator_LDO_ops,
	309	.min_uV = 1350000,
	310	.uV_step = 12500,
	311	.n_voltages = 128,
	312	.vsel_mask = MAX77650_REGULATOR_V_LDO_MASK,
	313	.vsel_reg = MAX77650_REG_CNFG_LDO_A,
	314	.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
	315	.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
	316	.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
	317	.active_discharge_reg = MAX77650_REG_CNFG_LDO_B,
	318	.enable_time = 100,
	319	.type = REGULATOR_VOLTAGE,
721efb50	320	.owner = THIS_MODULE,
bcc61f1c BG	321	},
	322	.regA = MAX77650_REG_CNFG_LDO_A,
	323	.regB = MAX77650_REG_CNFG_LDO_B,
	324	};
	325
	326	static struct max77650_regulator_desc max77650_SBB0_desc = {
	327	.desc = {
	328	.name = "sbb0",
	329	.of_match = of_match_ptr("sbb0"),
	330	.regulators_node = of_match_ptr("regulators"),
	331	.supply_name = "in-sbb0",
	332	.id = MAX77650_REGULATOR_ID_SBB0,
	333	.ops = &max77650_regulator_SBB_ops,
	334	.min_uV = 800000,
	335	.uV_step = 25000,
	336	.n_voltages = 64,
	337	.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
	338	.vsel_reg = MAX77650_REG_CNFG_SBB0_A,
	339	.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
	340	.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
	341	.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
	342	.active_discharge_reg = MAX77650_REG_CNFG_SBB0_B,
	343	.enable_time = 100,
	344	.type = REGULATOR_VOLTAGE,
721efb50	345	.owner = THIS_MODULE,
bcc61f1c BG	346	},
	347	.regA = MAX77650_REG_CNFG_SBB0_A,
	348	.regB = MAX77650_REG_CNFG_SBB0_B,
	349	};
	350
	351	static struct max77650_regulator_desc max77650_SBB1_desc = {
	352	.desc = {
	353	.name = "sbb1",
	354	.of_match = of_match_ptr("sbb1"),
	355	.regulators_node = of_match_ptr("regulators"),
	356	.supply_name = "in-sbb1",
	357	.id = MAX77650_REGULATOR_ID_SBB1,
	358	.ops = &max77650_regulator_SBB_ops,
	359	.min_uV = 800000,
	360	.uV_step = 12500,
	361	.n_voltages = 64,
	362	.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
	363	.vsel_reg = MAX77650_REG_CNFG_SBB1_A,
	364	.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
	365	.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
	366	.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
	367	.active_discharge_reg = MAX77650_REG_CNFG_SBB1_B,
	368	.enable_time = 100,
	369	.type = REGULATOR_VOLTAGE,
721efb50	370	.owner = THIS_MODULE,
bcc61f1c BG	371	},
	372	.regA = MAX77650_REG_CNFG_SBB1_A,
	373	.regB = MAX77650_REG_CNFG_SBB1_B,
	374	};
	375
	376	static struct max77650_regulator_desc max77651_SBB1_desc = {
	377	.desc = {
	378	.name = "sbb1",
	379	.of_match = of_match_ptr("sbb1"),
	380	.regulators_node = of_match_ptr("regulators"),
	381	.supply_name = "in-sbb1",
	382	.id = MAX77650_REGULATOR_ID_SBB1,
	383	.ops = &max77651_SBB1_regulator_ops,
	384	.volt_table = max77651_sbb1_regulator_volt_table,
	385	.n_voltages = ARRAY_SIZE(max77651_sbb1_regulator_volt_table),
	386	.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
	387	.vsel_reg = MAX77650_REG_CNFG_SBB1_A,
	388	.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
	389	.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
	390	.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
	391	.active_discharge_reg = MAX77650_REG_CNFG_SBB1_B,
	392	.enable_time = 100,
	393	.type = REGULATOR_VOLTAGE,
721efb50	394	.owner = THIS_MODULE,
bcc61f1c BG	395	},
	396	.regA = MAX77650_REG_CNFG_SBB1_A,
	397	.regB = MAX77650_REG_CNFG_SBB1_B,
	398	};
	399
	400	static struct max77650_regulator_desc max77650_SBB2_desc = {
	401	.desc = {
	402	.name = "sbb2",
	403	.of_match = of_match_ptr("sbb2"),
	404	.regulators_node = of_match_ptr("regulators"),
	405	.supply_name = "in-sbb0",
	406	.id = MAX77650_REGULATOR_ID_SBB2,
	407	.ops = &max77650_regulator_SBB_ops,
	408	.min_uV = 800000,
	409	.uV_step = 50000,
	410	.n_voltages = 64,
	411	.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
	412	.vsel_reg = MAX77650_REG_CNFG_SBB2_A,
	413	.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
	414	.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
	415	.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
	416	.active_discharge_reg = MAX77650_REG_CNFG_SBB2_B,
	417	.enable_time = 100,
	418	.type = REGULATOR_VOLTAGE,
721efb50	419	.owner = THIS_MODULE,
bcc61f1c BG	420	},
	421	.regA = MAX77650_REG_CNFG_SBB2_A,
	422	.regB = MAX77650_REG_CNFG_SBB2_B,
	423	};
	424
	425	static struct max77650_regulator_desc max77651_SBB2_desc = {
	426	.desc = {
	427	.name = "sbb2",
	428	.of_match = of_match_ptr("sbb2"),
	429	.regulators_node = of_match_ptr("regulators"),
	430	.supply_name = "in-sbb0",
	431	.id = MAX77650_REGULATOR_ID_SBB2,
	432	.ops = &max77650_regulator_SBB_ops,
	433	.min_uV = 2400000,
	434	.uV_step = 50000,
	435	.n_voltages = 64,
	436	.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
	437	.vsel_reg = MAX77650_REG_CNFG_SBB2_A,
	438	.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
	439	.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
	440	.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
	441	.active_discharge_reg = MAX77650_REG_CNFG_SBB2_B,
	442	.enable_time = 100,
	443	.type = REGULATOR_VOLTAGE,
721efb50	444	.owner = THIS_MODULE,
bcc61f1c BG	445	},
	446	.regA = MAX77650_REG_CNFG_SBB2_A,
	447	.regB = MAX77650_REG_CNFG_SBB2_B,
	448	};
	449
	450	static int max77650_regulator_probe(struct platform_device *pdev)
	451	{
	452	struct max77650_regulator_desc **rdescs;
	453	struct max77650_regulator_desc *rdesc;
	454	struct regulator_config config = { };
	455	struct device dev, parent;
	456	struct regulator_dev *rdev;
	457	struct regmap *map;
	458	unsigned int val;
	459	int i, rv;
	460
	461	dev = &pdev->dev;
	462	parent = dev->parent;
	463
	464	if (!dev->of_node)
	465	dev->of_node = parent->of_node;
	466
	467	rdescs = devm_kcalloc(dev, MAX77650_REGULATOR_NUM_REGULATORS,
	468	sizeof(*rdescs), GFP_KERNEL);
	469	if (!rdescs)
	470	return -ENOMEM;
	471
	472	map = dev_get_regmap(parent, NULL);
	473	if (!map)
	474	return -ENODEV;
	475
	476	rv = regmap_read(map, MAX77650_REG_CID, &val);
	477	if (rv)
	478	return rv;
	479
	480	rdescs[MAX77650_REGULATOR_ID_LDO] = &max77650_LDO_desc;
	481	rdescs[MAX77650_REGULATOR_ID_SBB0] = &max77650_SBB0_desc;
	482
	483	switch (MAX77650_CID_BITS(val)) {
	484	case MAX77650_CID_77650A:
	485	case MAX77650_CID_77650C:
	486	rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77650_SBB1_desc;
	487	rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77650_SBB2_desc;
	488	break;
	489	case MAX77650_CID_77651A:
	490	case MAX77650_CID_77651B:
	491	rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77651_SBB1_desc;
	492	rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77651_SBB2_desc;
	493	break;
	494	default:
	495	return -ENODEV;
	496	}
	497
	498	config.dev = parent;
	499
	500	for (i = 0; i < MAX77650_REGULATOR_NUM_REGULATORS; i++) {
	501	rdesc = rdescs[i];
	502	config.driver_data = rdesc;
	503
	504	rdev = devm_regulator_register(dev, &rdesc->desc, &config);
	505	if (IS_ERR(rdev))
	506	return PTR_ERR(rdev);
	507	}
	508
509	return 0;
510	}
511
512	static struct platform_driver max77650_regulator_driver = {
513	.driver = {
514	.name = "max77650-regulator",
515	},
516	.probe = max77650_regulator_probe,
517	};
518	module_platform_driver(max77650_regulator_driver);
519
520	MODULE_DESCRIPTION("MAXIM 77650/77651 regulator driver");
521	MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
522	MODULE_LICENSE("GPL v2");