[linux-2.6-block.git] / drivers / regulator / mcp16502.c

// SPDX-License-Identifier: GPL-2.0
//
// MCP16502 PMIC driver
//
// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
//
// Author: Andrei Stefanescu <andrei.stefanescu@microchip.com>
//
// Inspired from tps65086-regulator.c

#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/suspend.h>
#include <linux/gpio/consumer.h>

#define VDD_LOW_SEL 0x0D
#define VDD_HIGH_SEL 0x3F

#define MCP16502_FLT BIT(7)
#define MCP16502_ENS BIT(0)

/*
 * The PMIC has four sets of registers corresponding to four power modes:
 * Performance, Active, Low-power, Hibernate.
 *
 * Registers:
 * Each regulator has a register for each power mode. To access a register
 * for a specific regulator and mode BASE_* and OFFSET_* need to be added.
 *
 * Operating modes:
 * In order for the PMIC to transition to operating modes it has to be
 * controlled via GPIO lines called LPM and HPM.
 *
 * The registers are fully configurable such that you can put all regulators in
 * a low-power state while the PMIC is in Active mode. They are supposed to be
 * configured at startup and then simply transition to/from a global low-power
 * state by setting the GPIO lpm pin high/low.
 *
 * This driver keeps the PMIC in Active mode, Low-power state is set for the
 * regulators by enabling/disabling operating mode (FPWM or Auto PFM).
 *
 * The PMIC's Low-power and Hibernate modes are used during standby/suspend.
 * To enter standby/suspend the PMIC will go to Low-power mode. From there, it
 * will transition to Hibernate when the PWRHLD line is set to low by the MPU.
 */

/*
 * This function is useful for iterating over all regulators and accessing their
 * registers in a generic way or accessing a regulator device by its id.
 */
#define MCP16502_BASE(i) (((i) + 1) << 4)
#define MCP16502_STAT_BASE(i) ((i) + 5)

#define MCP16502_OFFSET_MODE_A 0
#define MCP16502_OFFSET_MODE_LPM 1
#define MCP16502_OFFSET_MODE_HIB 2

#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL
#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE
#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY

#define MCP16502_MODE_AUTO_PFM 0
#define MCP16502_MODE_FPWM BIT(6)

#define MCP16502_VSEL 0x3F
#define MCP16502_EN BIT(7)
#define MCP16502_MODE BIT(6)

#define MCP16502_MIN_REG 0x0
#define MCP16502_MAX_REG 0x65

static unsigned int mcp16502_of_map_mode(unsigned int mode)
{
	if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
		return mode;

	return REGULATOR_MODE_INVALID;
}

#define MCP16502_REGULATOR(_name, _id, _ranges, _ops)			\
	[_id] = {							\
		.name			= _name,			\
		.regulators_node	= of_match_ptr("regulators"),	\
		.id			= _id,				\
		.ops			= &(_ops),			\
		.type			= REGULATOR_VOLTAGE,		\
		.owner			= THIS_MODULE,			\
		.n_voltages		= MCP16502_VSEL + 1,		\
		.linear_ranges		= _ranges,			\
		.n_linear_ranges	= ARRAY_SIZE(_ranges),		\
		.of_match		= of_match_ptr(_name),		\
		.of_map_mode		= mcp16502_of_map_mode,		\
		.vsel_reg		= (((_id) + 1) << 4),		\
		.vsel_mask		= MCP16502_VSEL,		\
		.enable_reg		= (((_id) + 1) << 4),		\
		.enable_mask		= MCP16502_EN,			\
	}

enum {
	BUCK1 = 0,
	BUCK2,
	BUCK3,
	BUCK4,
	LDO1,
	LDO2,
	NUM_REGULATORS
};

/*
 * struct mcp16502 - PMIC representation
 * @rdev: the regulators belonging to this chip
 * @rmap: regmap to be used for I2C communication
 * @lpm: LPM GPIO descriptor
 */
struct mcp16502 {
	struct regulator_dev *rdev[NUM_REGULATORS];
	struct regmap *rmap;
	struct gpio_desc *lpm;
};

/*
 * mcp16502_gpio_set_mode() - set the GPIO corresponding value
 *
 * Used to prepare transitioning into hibernate or resuming from it.
 */
static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)
{
	switch (mode) {
	case MCP16502_OPMODE_ACTIVE:
		gpiod_set_value(mcp->lpm, 0);
		break;
	case MCP16502_OPMODE_LPM:
	case MCP16502_OPMODE_HIB:
		gpiod_set_value(mcp->lpm, 1);
		break;
	default:
		pr_err("%s: %d invalid\n", __func__, mode);
	}
}

/*
 * mcp16502_get_reg() - get the PMIC's configuration register for opmode
 *
 * @rdev: the regulator whose register we are searching
 * @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate
 */
static int mcp16502_get_reg(struct regulator_dev *rdev, int opmode)
{
	int reg = MCP16502_BASE(rdev_get_id(rdev));

	switch (opmode) {
	case MCP16502_OPMODE_ACTIVE:
		return reg + MCP16502_OFFSET_MODE_A;
	case MCP16502_OPMODE_LPM:
		return reg + MCP16502_OFFSET_MODE_LPM;
	case MCP16502_OPMODE_HIB:
		return reg + MCP16502_OFFSET_MODE_HIB;
	default:
		return -EINVAL;
	}
}

/*
 * mcp16502_get_mode() - return the current operating mode of a regulator
 *
 * Note: all functions that are not part of entering/exiting standby/suspend
 *	 use the Active mode registers.
 *
 * Note: this is different from the PMIC's operatig mode, it is the
 *	 MODE bit from the regulator's register.
 */
static unsigned int mcp16502_get_mode(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret, reg;
	struct mcp16502 *mcp = rdev_get_drvdata(rdev);

	reg = mcp16502_get_reg(rdev, MCP16502_OPMODE_ACTIVE);
	if (reg < 0)
		return reg;

	ret = regmap_read(mcp->rmap, reg, &val);
	if (ret)
		return ret;

	switch (val & MCP16502_MODE) {
	case MCP16502_MODE_FPWM:
		return REGULATOR_MODE_NORMAL;
	case MCP16502_MODE_AUTO_PFM:
		return REGULATOR_MODE_IDLE;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

/*
 * _mcp16502_set_mode() - helper for set_mode and set_suspend_mode
 *
 * @rdev: the regulator for which we are setting the mode
 * @mode: the regulator's mode (the one from MODE bit)
 * @opmode: the PMIC's operating mode: Active/Low-power/Hibernate
 */
static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,
			      unsigned int op_mode)
{
	int val;
	int reg;
	struct mcp16502 *mcp = rdev_get_drvdata(rdev);

	reg = mcp16502_get_reg(rdev, op_mode);
	if (reg < 0)
		return reg;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		val = MCP16502_MODE_FPWM;
		break;
	case REGULATOR_MODE_IDLE:
		val = MCP16502_MODE_AUTO_PFM;
		break;
	default:
		return -EINVAL;
	}

	reg = regmap_update_bits(mcp->rmap, reg, MCP16502_MODE, val);
	return reg;
}

/*
 * mcp16502_set_mode() - regulator_ops set_mode
 */
static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);
}

/*
 * mcp16502_get_status() - regulator_ops get_status
 */
static int mcp16502_get_status(struct regulator_dev *rdev)
{
	int ret;
	unsigned int val;
	struct mcp16502 *mcp = rdev_get_drvdata(rdev);

	ret = regmap_read(mcp->rmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),
			  &val);
	if (ret)
		return ret;

	if (val & MCP16502_FLT)
		return REGULATOR_STATUS_ERROR;
	else if (val & MCP16502_ENS)
		return REGULATOR_STATUS_ON;
	else if (!(val & MCP16502_ENS))
		return REGULATOR_STATUS_OFF;

	return REGULATOR_STATUS_UNDEFINED;
}

#ifdef CONFIG_SUSPEND
/*
 * mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
 *				       mode
 */
static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev)
{
	switch (pm_suspend_target_state) {
	case PM_SUSPEND_STANDBY:
		return mcp16502_get_reg(rdev, MCP16502_OPMODE_LPM);
	case PM_SUSPEND_ON:
	case PM_SUSPEND_MEM:
		return mcp16502_get_reg(rdev, MCP16502_OPMODE_HIB);
	default:
		dev_err(&rdev->dev, "invalid suspend target: %d\n",
			pm_suspend_target_state);
	}

	return -EINVAL;
}

/*
 * mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage
 */
static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
	int sel = regulator_map_voltage_linear_range(rdev, uV, uV);
	int reg = mcp16502_suspend_get_target_reg(rdev);

	if (sel < 0)
		return sel;

	if (reg < 0)
		return reg;

	return regmap_update_bits(mcp->rmap, reg, MCP16502_VSEL, sel);
}

/*
 * mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode
 */
static int mcp16502_set_suspend_mode(struct regulator_dev *rdev,
				     unsigned int mode)
{
	switch (pm_suspend_target_state) {
	case PM_SUSPEND_STANDBY:
		return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);
	case PM_SUSPEND_ON:
	case PM_SUSPEND_MEM:
		return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);
	default:
		dev_err(&rdev->dev, "invalid suspend target: %d\n",
			pm_suspend_target_state);
	}

	return -EINVAL;
}

/*
 * mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable
 */
static int mcp16502_set_suspend_enable(struct regulator_dev *rdev)
{
	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
	int reg = mcp16502_suspend_get_target_reg(rdev);

	if (reg < 0)
		return reg;

	return regmap_update_bits(mcp->rmap, reg, MCP16502_EN, MCP16502_EN);
}

/*
 * mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable
 */
static int mcp16502_set_suspend_disable(struct regulator_dev *rdev)
{
	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
	int reg = mcp16502_suspend_get_target_reg(rdev);

	if (reg < 0)
		return reg;

	return regmap_update_bits(mcp->rmap, reg, MCP16502_EN, 0);
}
#endif /* CONFIG_SUSPEND */

static const struct regulator_ops mcp16502_buck_ops = {
	.list_voltage			= regulator_list_voltage_linear_range,
	.map_voltage			= regulator_map_voltage_linear_range,
	.get_voltage_sel		= regulator_get_voltage_sel_regmap,
	.set_voltage_sel		= regulator_set_voltage_sel_regmap,
	.enable				= regulator_enable_regmap,
	.disable			= regulator_disable_regmap,
	.is_enabled			= regulator_is_enabled_regmap,
	.get_status			= mcp16502_get_status,

	.set_mode			= mcp16502_set_mode,
	.get_mode			= mcp16502_get_mode,

#ifdef CONFIG_SUSPEND
	.set_suspend_voltage		= mcp16502_set_suspend_voltage,
	.set_suspend_mode		= mcp16502_set_suspend_mode,
	.set_suspend_enable		= mcp16502_set_suspend_enable,
	.set_suspend_disable		= mcp16502_set_suspend_disable,
#endif /* CONFIG_SUSPEND */
};

/*
 * LDOs cannot change operating modes.
 */
static const struct regulator_ops mcp16502_ldo_ops = {
	.list_voltage			= regulator_list_voltage_linear_range,
	.map_voltage			= regulator_map_voltage_linear_range,
	.get_voltage_sel		= regulator_get_voltage_sel_regmap,
	.set_voltage_sel		= regulator_set_voltage_sel_regmap,
	.enable				= regulator_enable_regmap,
	.disable			= regulator_disable_regmap,
	.is_enabled			= regulator_is_enabled_regmap,
	.get_status			= mcp16502_get_status,

#ifdef CONFIG_SUSPEND
	.set_suspend_voltage		= mcp16502_set_suspend_voltage,
	.set_suspend_enable		= mcp16502_set_suspend_enable,
	.set_suspend_disable		= mcp16502_set_suspend_disable,
#endif /* CONFIG_SUSPEND */
};

static const struct of_device_id mcp16502_ids[] = {
	{ .compatible = "microchip,mcp16502", },
	{}
};
MODULE_DEVICE_TABLE(of, mcp16502_ids);

static const struct regulator_linear_range b1l12_ranges[] = {
	REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000),
};

static const struct regulator_linear_range b234_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000),
};

static const struct regulator_desc mcp16502_desc[] = {
	/* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops) */
	MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops),
	MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops),
	MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops),
	MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops),
	MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops),
	MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops)
};

static const struct regmap_range mcp16502_ranges[] = {
	regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG)
};

static const struct regmap_access_table mcp16502_yes_reg_table = {
	.yes_ranges = mcp16502_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp16502_ranges),
};

static const struct regmap_config mcp16502_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= MCP16502_MAX_REG,
	.cache_type	= REGCACHE_NONE,
	.rd_table	= &mcp16502_yes_reg_table,
	.wr_table	= &mcp16502_yes_reg_table,
};

/*
 * set_up_regulators() - initialize all regulators
 */
static int setup_regulators(struct mcp16502 *mcp, struct device *dev,
			    struct regulator_config config)
{
	int i;

	for (i = 0; i < NUM_REGULATORS; i++) {
		mcp->rdev[i] = devm_regulator_register(dev,
						       &mcp16502_desc[i],
						       &config);
		if (IS_ERR(mcp->rdev[i])) {
			dev_err(dev,
				"failed to register %s regulator %ld\n",
				mcp16502_desc[i].name, PTR_ERR(mcp->rdev[i]));
			return PTR_ERR(mcp->rdev[i]);
		}
	}

	return 0;
}

static int mcp16502_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct regulator_config config = { };
	struct device *dev;
	struct mcp16502 *mcp;
	int ret = 0;

	dev = &client->dev;
	config.dev = dev;

	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
	if (!mcp)
		return -ENOMEM;

	mcp->rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config);
	if (IS_ERR(mcp->rmap)) {
		ret = PTR_ERR(mcp->rmap);
		dev_err(dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	i2c_set_clientdata(client, mcp);
	config.regmap = mcp->rmap;
	config.driver_data = mcp;

	mcp->lpm = devm_gpiod_get(dev, "lpm", GPIOD_OUT_LOW);
	if (IS_ERR(mcp->lpm)) {
		dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));
		return PTR_ERR(mcp->lpm);
	}

	ret = setup_regulators(mcp, dev, config);
	if (ret != 0)
		return ret;

	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int mcp16502_suspend_noirq(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mcp16502 *mcp = i2c_get_clientdata(client);

	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);

	return 0;
}

static int mcp16502_resume_noirq(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mcp16502 *mcp = i2c_get_clientdata(client);

	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);

	return 0;
}
#endif

#ifdef CONFIG_PM
static const struct dev_pm_ops mcp16502_pm_ops = {
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
				      mcp16502_resume_noirq)
};
#endif
static const struct i2c_device_id mcp16502_i2c_id[] = {
	{ "mcp16502", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id);

static struct i2c_driver mcp16502_drv = {
	.probe		= mcp16502_probe,
	.driver		= {
		.name	= "mcp16502-regulator",
		.of_match_table	= of_match_ptr(mcp16502_ids),
#ifdef CONFIG_PM
		.pm = &mcp16502_pm_ops,
#endif
	},
	.id_table	= mcp16502_i2c_id,
};

module_i2c_driver(mcp16502_drv);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MCP16502 PMIC driver");
MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com");
Commit	Line	Data
919261c0 AS	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// MCP16502 PMIC driver
	4	//
	5	// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
	6	//
	7	// Author: Andrei Stefanescu <andrei.stefanescu@microchip.com>
	8	//
	9	// Inspired from tps65086-regulator.c
	10
	11	#include <linux/gpio.h>
	12	#include <linux/i2c.h>
	13	#include <linux/init.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/of.h>
	17	#include <linux/regmap.h>
	18	#include <linux/regulator/driver.h>
	19	#include <linux/suspend.h>
f3c6a1a1	20	#include <linux/gpio/consumer.h>
919261c0 AS	21
	22	#define VDD_LOW_SEL 0x0D
	23	#define VDD_HIGH_SEL 0x3F
	24
	25	#define MCP16502_FLT BIT(7)
	26	#define MCP16502_ENS BIT(0)
	27
	28	/*
	29	* The PMIC has four sets of registers corresponding to four power modes:
	30	* Performance, Active, Low-power, Hibernate.
	31	*
	32	* Registers:
	33	* Each regulator has a register for each power mode. To access a register
	34	* for a specific regulator and mode BASE_* and OFFSET_* need to be added.
	35	*
	36	* Operating modes:
	37	* In order for the PMIC to transition to operating modes it has to be
	38	* controlled via GPIO lines called LPM and HPM.
	39	*
	40	* The registers are fully configurable such that you can put all regulators in
	41	* a low-power state while the PMIC is in Active mode. They are supposed to be
	42	* configured at startup and then simply transition to/from a global low-power
	43	* state by setting the GPIO lpm pin high/low.
	44	*
	45	* This driver keeps the PMIC in Active mode, Low-power state is set for the
	46	* regulators by enabling/disabling operating mode (FPWM or Auto PFM).
	47	*
	48	* The PMIC's Low-power and Hibernate modes are used during standby/suspend.
	49	* To enter standby/suspend the PMIC will go to Low-power mode. From there, it
	50	* will transition to Hibernate when the PWRHLD line is set to low by the MPU.
	51	*/
	52
	53	/*
	54	* This function is useful for iterating over all regulators and accessing their
	55	* registers in a generic way or accessing a regulator device by its id.
	56	*/
	57	#define MCP16502_BASE(i) (((i) + 1) << 4)
	58	#define MCP16502_STAT_BASE(i) ((i) + 5)
	59
	60	#define MCP16502_OFFSET_MODE_A 0
	61	#define MCP16502_OFFSET_MODE_LPM 1
	62	#define MCP16502_OFFSET_MODE_HIB 2
	63
	64	#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL
	65	#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE
	66	#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY
	67
	68	#define MCP16502_MODE_AUTO_PFM 0
	69	#define MCP16502_MODE_FPWM BIT(6)
	70
	71	#define MCP16502_VSEL 0x3F
	72	#define MCP16502_EN BIT(7)
	73	#define MCP16502_MODE BIT(6)
	74
	75	#define MCP16502_MIN_REG 0x0
	76	#define MCP16502_MAX_REG 0x65
	77
	78	static unsigned int mcp16502_of_map_mode(unsigned int mode)
	79	{
	80	if (mode == REGULATOR_MODE_NORMAL \|\| mode == REGULATOR_MODE_IDLE)
	81	return mode;
	82
	83	return REGULATOR_MODE_INVALID;
	84	}
85
86	#define MCP16502_REGULATOR(_name, _id, _ranges, _ops) \
87	[_id] = { \
88	.name = _name, \
89	.regulators_node = of_match_ptr("regulators"), \
90	.id = _id, \
91	.ops = &(_ops), \
92	.type = REGULATOR_VOLTAGE, \
93	.owner = THIS_MODULE, \
f4c8f980	94	.n_voltages = MCP16502_VSEL + 1, \
919261c0 AS	95	.linear_ranges = _ranges, \
	96	.n_linear_ranges = ARRAY_SIZE(_ranges), \
	97	.of_match = of_match_ptr(_name), \
	98	.of_map_mode = mcp16502_of_map_mode, \
	99	.vsel_reg = (((_id) + 1) << 4), \
	100	.vsel_mask = MCP16502_VSEL, \
	101	.enable_reg = (((_id) + 1) << 4), \
	102	.enable_mask = MCP16502_EN, \
	103	}
	104
	105	enum {
	106	BUCK1 = 0,
	107	BUCK2,
	108	BUCK3,
	109	BUCK4,
	110	LDO1,
	111	LDO2,
	112	NUM_REGULATORS
	113	};
	114
	115	/*
	116	* struct mcp16502 - PMIC representation
	117	* @rdev: the regulators belonging to this chip
	118	* @rmap: regmap to be used for I2C communication
	119	* @lpm: LPM GPIO descriptor
	120	*/
	121	struct mcp16502 {
	122	struct regulator_dev *rdev[NUM_REGULATORS];
	123	struct regmap *rmap;
	124	struct gpio_desc *lpm;
	125	};
	126
	127	/*
	128	* mcp16502_gpio_set_mode() - set the GPIO corresponding value
	129	*
	130	* Used to prepare transitioning into hibernate or resuming from it.
	131	*/
	132	static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)
	133	{
	134	switch (mode) {
	135	case MCP16502_OPMODE_ACTIVE:
	136	gpiod_set_value(mcp->lpm, 0);
	137	break;
	138	case MCP16502_OPMODE_LPM:
	139	case MCP16502_OPMODE_HIB:
	140	gpiod_set_value(mcp->lpm, 1);
	141	break;
	142	default:
	143	pr_err("%s: %d invalid\n", __func__, mode);
	144	}
	145	}
	146
	147	/*
	148	* mcp16502_get_reg() - get the PMIC's configuration register for opmode
	149	*
	150	* @rdev: the regulator whose register we are searching
	151	* @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate
	152	*/
	153	static int mcp16502_get_reg(struct regulator_dev *rdev, int opmode)
	154	{
	155	int reg = MCP16502_BASE(rdev_get_id(rdev));
	156
	157	switch (opmode) {
	158	case MCP16502_OPMODE_ACTIVE:
159	return reg + MCP16502_OFFSET_MODE_A;
160	case MCP16502_OPMODE_LPM:
161	return reg + MCP16502_OFFSET_MODE_LPM;
162	case MCP16502_OPMODE_HIB:
163	return reg + MCP16502_OFFSET_MODE_HIB;
164	default:
165	return -EINVAL;
166	}
167	}
168
169	/*
170	* mcp16502_get_mode() - return the current operating mode of a regulator
171	*
172	* Note: all functions that are not part of entering/exiting standby/suspend
173	* use the Active mode registers.
174	*
175	* Note: this is different from the PMIC's operatig mode, it is the
176	* MODE bit from the regulator's register.
177	*/
178	static unsigned int mcp16502_get_mode(struct regulator_dev *rdev)
179	{
180	unsigned int val;
181	int ret, reg;
182	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
183
184	reg = mcp16502_get_reg(rdev, MCP16502_OPMODE_ACTIVE);
185	if (reg < 0)
186	return reg;
187
188	ret = regmap_read(mcp->rmap, reg, &val);
189	if (ret)
190	return ret;
191
192	switch (val & MCP16502_MODE) {
193	case MCP16502_MODE_FPWM:
194	return REGULATOR_MODE_NORMAL;
195	case MCP16502_MODE_AUTO_PFM:
196	return REGULATOR_MODE_IDLE;
197	default:
198	return REGULATOR_MODE_INVALID;
199	}
200	}
201
202	/*
203	* _mcp16502_set_mode() - helper for set_mode and set_suspend_mode
204	*
205	* @rdev: the regulator for which we are setting the mode
206	* @mode: the regulator's mode (the one from MODE bit)
207	* @opmode: the PMIC's operating mode: Active/Low-power/Hibernate
208	*/
209	static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,
210	unsigned int op_mode)
211	{
212	int val;
213	int reg;
214	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
215
216	reg = mcp16502_get_reg(rdev, op_mode);
217	if (reg < 0)
218	return reg;
219
220	switch (mode) {
221	case REGULATOR_MODE_NORMAL:
222	val = MCP16502_MODE_FPWM;
223	break;
224	case REGULATOR_MODE_IDLE:
225	val = MCP16502_MODE_AUTO_PFM;
226	break;
227	default:
228	return -EINVAL;
229	}
230
231	reg = regmap_update_bits(mcp->rmap, reg, MCP16502_MODE, val);
232	return reg;
233	}
234
235	/*
236	* mcp16502_set_mode() - regulator_ops set_mode
237	*/
238	static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)
239	{
240	return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);
241	}
242
243	/*
244	* mcp16502_get_status() - regulator_ops get_status
245	*/
246	static int mcp16502_get_status(struct regulator_dev *rdev)
247	{
248	int ret;
249	unsigned int val;
250	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
251
252	ret = regmap_read(mcp->rmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),
253	&val);
254	if (ret)
255	return ret;
256
257	if (val & MCP16502_FLT)
258	return REGULATOR_STATUS_ERROR;
259	else if (val & MCP16502_ENS)
260	return REGULATOR_STATUS_ON;
261	else if (!(val & MCP16502_ENS))
262	return REGULATOR_STATUS_OFF;
263
264	return REGULATOR_STATUS_UNDEFINED;
265	}
266
267	#ifdef CONFIG_SUSPEND
268	/*
269	* mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
270	* mode
271	*/
272	static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev)
273	{
274	switch (pm_suspend_target_state) {
275	case PM_SUSPEND_STANDBY:
276	return mcp16502_get_reg(rdev, MCP16502_OPMODE_LPM);
277	case PM_SUSPEND_ON:
278	case PM_SUSPEND_MEM:
279	return mcp16502_get_reg(rdev, MCP16502_OPMODE_HIB);
280	default:
281	dev_err(&rdev->dev, "invalid suspend target: %d\n",
282	pm_suspend_target_state);
283	}
284
285	return -EINVAL;
286	}
287
288	/*
289	* mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage
290	*/
291	static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV)
292	{
293	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
294	int sel = regulator_map_voltage_linear_range(rdev, uV, uV);
295	int reg = mcp16502_suspend_get_target_reg(rdev);
296
297	if (sel < 0)
298	return sel;
299
300	if (reg < 0)
301	return reg;
302
303	return regmap_update_bits(mcp->rmap, reg, MCP16502_VSEL, sel);
304	}
305
306	/*
307	* mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode
308	*/
309	static int mcp16502_set_suspend_mode(struct regulator_dev *rdev,
310	unsigned int mode)
311	{
312	switch (pm_suspend_target_state) {
313	case PM_SUSPEND_STANDBY:
314	return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);
315	case PM_SUSPEND_ON:
316	case PM_SUSPEND_MEM:
317	return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);
318	default:
319	dev_err(&rdev->dev, "invalid suspend target: %d\n",
320	pm_suspend_target_state);
321	}
322
323	return -EINVAL;
324	}
325
326	/*
327	* mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable
328	*/
329	static int mcp16502_set_suspend_enable(struct regulator_dev *rdev)
330	{
331	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
332	int reg = mcp16502_suspend_get_target_reg(rdev);
333
334	if (reg < 0)
335	return reg;
336
337	return regmap_update_bits(mcp->rmap, reg, MCP16502_EN, MCP16502_EN);
338	}
339
340	/*
341	* mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable
342	*/
343	static int mcp16502_set_suspend_disable(struct regulator_dev *rdev)
344	{
345	struct mcp16502 *mcp = rdev_get_drvdata(rdev);
346	int reg = mcp16502_suspend_get_target_reg(rdev);
347
348	if (reg < 0)
349	return reg;
350
351	return regmap_update_bits(mcp->rmap, reg, MCP16502_EN, 0);
352	}
353	#endif /* CONFIG_SUSPEND */
354
355	static const struct regulator_ops mcp16502_buck_ops = {
356	.list_voltage = regulator_list_voltage_linear_range,
357	.map_voltage = regulator_map_voltage_linear_range,
358	.get_voltage_sel = regulator_get_voltage_sel_regmap,
359	.set_voltage_sel = regulator_set_voltage_sel_regmap,
360	.enable = regulator_enable_regmap,
361	.disable = regulator_disable_regmap,
362	.is_enabled = regulator_is_enabled_regmap,
363	.get_status = mcp16502_get_status,
364
365	.set_mode = mcp16502_set_mode,
366	.get_mode = mcp16502_get_mode,
367
368	#ifdef CONFIG_SUSPEND
369	.set_suspend_voltage = mcp16502_set_suspend_voltage,
370	.set_suspend_mode = mcp16502_set_suspend_mode,
371	.set_suspend_enable = mcp16502_set_suspend_enable,
372	.set_suspend_disable = mcp16502_set_suspend_disable,
373	#endif /* CONFIG_SUSPEND */
374	};
375
376	/*
377	* LDOs cannot change operating modes.
378	*/
379	static const struct regulator_ops mcp16502_ldo_ops = {
380	.list_voltage = regulator_list_voltage_linear_range,
381	.map_voltage = regulator_map_voltage_linear_range,
382	.get_voltage_sel = regulator_get_voltage_sel_regmap,
383	.set_voltage_sel = regulator_set_voltage_sel_regmap,
384	.enable = regulator_enable_regmap,
385	.disable = regulator_disable_regmap,
386	.is_enabled = regulator_is_enabled_regmap,
387	.get_status = mcp16502_get_status,
388
389	#ifdef CONFIG_SUSPEND
390	.set_suspend_voltage = mcp16502_set_suspend_voltage,
391	.set_suspend_enable = mcp16502_set_suspend_enable,
392	.set_suspend_disable = mcp16502_set_suspend_disable,
393	#endif /* CONFIG_SUSPEND */
394	};
395
396	static const struct of_device_id mcp16502_ids[] = {
397	{ .compatible = "microchip,mcp16502", },
398	{}
399	};
400	MODULE_DEVICE_TABLE(of, mcp16502_ids);
401
402	static const struct regulator_linear_range b1l12_ranges[] = {
403	REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000),
404	};
405
406	static const struct regulator_linear_range b234_ranges[] = {
407	REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000),
408	};
409
410	static const struct regulator_desc mcp16502_desc[] = {
411	/* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops) */
412	MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops),
413	MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops),
414	MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops),
415	MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops),
416	MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops),
417	MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops)
418	};
419
420	static const struct regmap_range mcp16502_ranges[] = {
421	regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG)
422	};
423
424	static const struct regmap_access_table mcp16502_yes_reg_table = {
425	.yes_ranges = mcp16502_ranges,
426	.n_yes_ranges = ARRAY_SIZE(mcp16502_ranges),
427	};
428
429	static const struct regmap_config mcp16502_regmap_config = {
430	.reg_bits = 8,
431	.val_bits = 8,
432	.max_register = MCP16502_MAX_REG,
433	.cache_type = REGCACHE_NONE,
434	.rd_table = &mcp16502_yes_reg_table,
435	.wr_table = &mcp16502_yes_reg_table,
436	};
437
438	/*
439	* set_up_regulators() - initialize all regulators
440	*/
441	static int setup_regulators(struct mcp16502 mcp, struct device dev,
442	struct regulator_config config)
443	{
444	int i;
445
446	for (i = 0; i < NUM_REGULATORS; i++) {
447	mcp->rdev[i] = devm_regulator_register(dev,
448	&mcp16502_desc[i],
449	&config);
450	if (IS_ERR(mcp->rdev[i])) {
451	dev_err(dev,
452	"failed to register %s regulator %ld\n",
453	mcp16502_desc[i].name, PTR_ERR(mcp->rdev[i]));
454	return PTR_ERR(mcp->rdev[i]);
455	}
456	}
457
458	return 0;
459	}
460
461	static int mcp16502_probe(struct i2c_client *client,
462	const struct i2c_device_id *id)
463	{
464	struct regulator_config config = { };
465	struct device *dev;
466	struct mcp16502 *mcp;
467	int ret = 0;
468
469	dev = &client->dev;
470	config.dev = dev;
471
472	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
473	if (!mcp)
474	return -ENOMEM;
475
476	mcp->rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config);
477	if (IS_ERR(mcp->rmap)) {
478	ret = PTR_ERR(mcp->rmap);
479	dev_err(dev, "regmap init failed: %d\n", ret);
480	return ret;
481	}
482
483	i2c_set_clientdata(client, mcp);
484	config.regmap = mcp->rmap;
485	config.driver_data = mcp;
486
487	mcp->lpm = devm_gpiod_get(dev, "lpm", GPIOD_OUT_LOW);
488	if (IS_ERR(mcp->lpm)) {
489	dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));
490	return PTR_ERR(mcp->lpm);
491	}
492
493	ret = setup_regulators(mcp, dev, config);
494	if (ret != 0)
495	return ret;
496
497	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
498
499	return 0;
500	}
501
4906d091	502	#ifdef CONFIG_PM_SLEEP
fc401cb9 AS	503	static int mcp16502_suspend_noirq(struct device *dev)
	504	{
	505	struct i2c_client *client = to_i2c_client(dev);
	506	struct mcp16502 *mcp = i2c_get_clientdata(client);
	507
	508	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);
	509
	510	return 0;
	511	}
	512
	513	static int mcp16502_resume_noirq(struct device *dev)
	514	{
	515	struct i2c_client *client = to_i2c_client(dev);
	516	struct mcp16502 *mcp = i2c_get_clientdata(client);
	517
	518	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
	519
	520	return 0;
	521	}
4906d091	522	#endif
fc401cb9 AS	523
	524	#ifdef CONFIG_PM
	525	static const struct dev_pm_ops mcp16502_pm_ops = {
	526	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
308144ce	527	mcp16502_resume_noirq)
fc401cb9 AS	528	};
fc401cb9 AS	529	#endif
919261c0 AS	530	static const struct i2c_device_id mcp16502_i2c_id[] = {
	531	{ "mcp16502", 0 },
	532	{ }
	533	};
	534	MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id);
	535
	536	static struct i2c_driver mcp16502_drv = {
	537	.probe = mcp16502_probe,
	538	.driver = {
	539	.name = "mcp16502-regulator",
	540	.of_match_table = of_match_ptr(mcp16502_ids),
fc401cb9 AS	541	#ifdef CONFIG_PM
	542	.pm = &mcp16502_pm_ops,
	543	#endif
919261c0 AS	544	},
	545	.id_table = mcp16502_i2c_id,
	546	};
	547
	548	module_i2c_driver(mcp16502_drv);
	549
919261c0 AS	550	MODULE_LICENSE("GPL v2");
	551	MODULE_DESCRIPTION("MCP16502 PMIC driver");
	552	MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com");