[linux.git] / drivers / mfd / max14577.c

// SPDX-License-Identifier: GPL-2.0+
//
// max14577.c - mfd core driver for the Maxim 14577/77836
//
// Copyright (C) 2014 Samsung Electronics
// Chanwoo Choi <[email protected]>
// Krzysztof Kozlowski <[email protected]>
//
// This driver is based on max8997.c

#include <linux/err.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max14577.h>
#include <linux/mfd/max14577-private.h>

/*
 * Table of valid charger currents for different Maxim chipsets.
 * It is placed here because it is used by both charger and regulator driver.
 */
const struct maxim_charger_current maxim_charger_currents[] = {
	[MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
	[MAXIM_DEVICE_TYPE_MAX14577] = {
		.min		= MAX14577_CHARGER_CURRENT_LIMIT_MIN,
		.high_start	= MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START,
		.high_step	= MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP,
		.max		= MAX14577_CHARGER_CURRENT_LIMIT_MAX,
	},
	[MAXIM_DEVICE_TYPE_MAX77836] = {
		.min		= MAX77836_CHARGER_CURRENT_LIMIT_MIN,
		.high_start	= MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START,
		.high_step	= MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP,
		.max		= MAX77836_CHARGER_CURRENT_LIMIT_MAX,
	},
};
EXPORT_SYMBOL_GPL(maxim_charger_currents);

/*
 * maxim_charger_calc_reg_current - Calculate register value for current
 * @limits:	constraints for charger, matching the MBCICHWRC register
 * @min_ua:	minimal requested current, micro Amps
 * @max_ua:	maximum requested current, micro Amps
 * @dst:	destination to store calculated register value
 *
 * Calculates the value of MBCICHWRC (Fast Battery Charge Current) register
 * for given current and stores it under pointed 'dst'. The stored value
 * combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also
 * properly shifted.
 *
 * The calculated register value matches the current which:
 *  - is always between <limits.min, limits.max>;
 *  - is always less or equal to max_ua;
 *  - is the highest possible value;
 *  - may be lower than min_ua.
 *
 * On success returns 0. On error returns -EINVAL (requested min/max current
 * is outside of given charger limits) and 'dst' is not set.
 */
int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits,
		unsigned int min_ua, unsigned int max_ua, u8 *dst)
{
	unsigned int current_bits = 0xf;

	if (min_ua > max_ua)
		return -EINVAL;

	if (min_ua > limits->max || max_ua < limits->min)
		return -EINVAL;

	if (max_ua < limits->high_start) {
		/*
		 * Less than high_start, so set the minimal current
		 * (turn Low Bit off, 0 as high bits).
		 */
		*dst = 0x0;
		return 0;
	}

	/* max_ua is in range: <high_start, infinite>, cut it to limits.max */
	max_ua = min(limits->max, max_ua);
	max_ua -= limits->high_start;
	/*
	 * There is no risk of overflow 'max_ua' here because:
	 *  - max_ua >= limits.high_start
	 *  - BUILD_BUG checks that 'limits' are: max >= high_start + high_step
	 */
	current_bits = max_ua / limits->high_step;

	/* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */
	*dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
	/* and set proper High Bits */
	*dst |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;

	return 0;
}
EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current);

static const struct mfd_cell max14577_devs[] = {
	{
		.name = "max14577-muic",
		.of_compatible = "maxim,max14577-muic",
	},
	{
		.name = "max14577-regulator",
		.of_compatible = "maxim,max14577-regulator",
	},
	{
		.name = "max14577-charger",
		.of_compatible = "maxim,max14577-charger",
	},
};

static const struct mfd_cell max77836_devs[] = {
	{
		.name = "max77836-muic",
		.of_compatible = "maxim,max77836-muic",
	},
	{
		.name = "max77836-regulator",
		.of_compatible = "maxim,max77836-regulator",
	},
	{
		.name = "max77836-charger",
		.of_compatible = "maxim,max77836-charger",
	},
	{
		.name = "max77836-battery",
		.of_compatible = "maxim,max77836-battery",
	},
};

static const struct of_device_id max14577_dt_match[] = {
	{
		.compatible = "maxim,max14577",
		.data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
	},
	{
		.compatible = "maxim,max77836",
		.data = (void *)MAXIM_DEVICE_TYPE_MAX77836,
	},
	{},
};

static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
		return true;
	default:
		break;
	}
	return false;
}

static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg)
{
	/* Any max14577 volatile registers are also max77836 volatile. */
	if (max14577_muic_volatile_reg(dev, reg))
		return true;

	switch (reg) {
	case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB:
	case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB:
	case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L:
	case MAX77836_PMIC_REG_INTSRC:
	case MAX77836_PMIC_REG_TOPSYS_INT:
	case MAX77836_PMIC_REG_TOPSYS_STAT:
		return true;
	default:
		break;
	}
	return false;
}

static const struct regmap_config max14577_muic_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.volatile_reg	= max14577_muic_volatile_reg,
	.max_register	= MAX14577_REG_END,
};

static const struct regmap_config max77836_pmic_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.volatile_reg	= max77836_muic_volatile_reg,
	.max_register	= MAX77836_PMIC_REG_END,
};

static const struct regmap_irq max14577_irqs[] = {
	/* INT1 interrupts */
	{ .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
	/* INT2 interrupts */
	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
	/* INT3 interrupts */
	{ .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
	{ .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
	{ .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
	{ .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
};

static const struct regmap_irq_chip max14577_irq_chip = {
	.name			= "max14577",
	.status_base		= MAX14577_REG_INT1,
	.mask_base		= MAX14577_REG_INTMASK1,
	.mask_invert		= true,
	.num_regs		= 3,
	.irqs			= max14577_irqs,
	.num_irqs		= ARRAY_SIZE(max14577_irqs),
};

static const struct regmap_irq max77836_muic_irqs[] = {
	/* INT1 interrupts */
	{ .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
	{ .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, },
	/* INT2 interrupts */
	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
	{ .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
	{ .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, },
	/* INT3 interrupts */
	{ .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
	{ .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
	{ .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
	{ .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
};

static const struct regmap_irq_chip max77836_muic_irq_chip = {
	.name			= "max77836-muic",
	.status_base		= MAX14577_REG_INT1,
	.mask_base		= MAX14577_REG_INTMASK1,
	.mask_invert		= true,
	.num_regs		= 3,
	.irqs			= max77836_muic_irqs,
	.num_irqs		= ARRAY_SIZE(max77836_muic_irqs),
};

static const struct regmap_irq max77836_pmic_irqs[] = {
	{ .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, },
	{ .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, },
};

static const struct regmap_irq_chip max77836_pmic_irq_chip = {
	.name			= "max77836-pmic",
	.status_base		= MAX77836_PMIC_REG_TOPSYS_INT,
	.mask_base		= MAX77836_PMIC_REG_TOPSYS_INT_MASK,
	.mask_invert		= false,
	.num_regs		= 1,
	.irqs			= max77836_pmic_irqs,
	.num_irqs		= ARRAY_SIZE(max77836_pmic_irqs),
};

static void max14577_print_dev_type(struct max14577 *max14577)
{
	u8 reg_data, vendor_id, device_id;
	int ret;

	ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
			&reg_data);
	if (ret) {
		dev_err(max14577->dev,
			"Failed to read DEVICEID register: %d\n", ret);
		return;
	}

	vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
				DEVID_VENDORID_SHIFT);
	device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
				DEVID_DEVICEID_SHIFT);

	dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
			max14577->dev_type, device_id, vendor_id);
}

/*
 * Max77836 specific initialization code for driver probe.
 * Adds new I2C dummy device, regmap and regmap IRQ chip.
 * Unmasks Interrupt Source register.
 *
 * On success returns 0.
 * On failure returns errno and reverts any changes done so far (e.g. remove
 * I2C dummy device), except masking the INT SRC register.
 */
static int max77836_init(struct max14577 *max14577)
{
	int ret;
	u8 intsrc_mask;

	max14577->i2c_pmic = i2c_new_dummy(max14577->i2c->adapter,
			I2C_ADDR_PMIC);
	if (!max14577->i2c_pmic) {
		dev_err(max14577->dev, "Failed to register PMIC I2C device\n");
		return -ENODEV;
	}
	i2c_set_clientdata(max14577->i2c_pmic, max14577);

	max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,
			&max77836_pmic_regmap_config);
	if (IS_ERR(max14577->regmap_pmic)) {
		ret = PTR_ERR(max14577->regmap_pmic);
		dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",
				ret);
		goto err;
	}

	/* Un-mask MAX77836 Interrupt Source register */
	ret = max14577_read_reg(max14577->regmap_pmic,
			MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask);
	if (ret < 0) {
		dev_err(max14577->dev, "Failed to read PMIC register\n");
		goto err;
	}

	intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK);
	intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK);
	ret = max14577_write_reg(max14577->regmap_pmic,
			MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask);
	if (ret < 0) {
		dev_err(max14577->dev, "Failed to write PMIC register\n");
		goto err;
	}

	ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,
			IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED,
			0, &max77836_pmic_irq_chip,
			&max14577->irq_data_pmic);
	if (ret != 0) {
		dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",
				max14577->irq, ret);
		goto err;
	}

	return 0;

err:
	i2c_unregister_device(max14577->i2c_pmic);

	return ret;
}

/*
 * Max77836 specific de-initialization code for driver remove.
 */
static void max77836_remove(struct max14577 *max14577)
{
	regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);
	i2c_unregister_device(max14577->i2c_pmic);
}

static int max14577_i2c_probe(struct i2c_client *i2c,
			      const struct i2c_device_id *id)
{
	struct max14577 *max14577;
	struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
	struct device_node *np = i2c->dev.of_node;
	int ret = 0;
	const struct regmap_irq_chip *irq_chip;
	const struct mfd_cell *mfd_devs;
	unsigned int mfd_devs_size;
	int irq_flags;

	if (np) {
		pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;
		i2c->dev.platform_data = pdata;
	}

	if (!pdata) {
		dev_err(&i2c->dev, "No platform data found.\n");
		return -EINVAL;
	}

	max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
	if (!max14577)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max14577);
	max14577->dev = &i2c->dev;
	max14577->i2c = i2c;
	max14577->irq = i2c->irq;

	max14577->regmap = devm_regmap_init_i2c(i2c,
			&max14577_muic_regmap_config);
	if (IS_ERR(max14577->regmap)) {
		ret = PTR_ERR(max14577->regmap);
		dev_err(max14577->dev, "Failed to allocate register map: %d\n",
				ret);
		return ret;
	}

	if (np) {
		const struct of_device_id *of_id;

		of_id = of_match_device(max14577_dt_match, &i2c->dev);
		if (of_id)
			max14577->dev_type =
				(enum maxim_device_type)of_id->data;
	} else {
		max14577->dev_type = id->driver_data;
	}

	max14577_print_dev_type(max14577);

	switch (max14577->dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		irq_chip = &max77836_muic_irq_chip;
		mfd_devs = max77836_devs;
		mfd_devs_size = ARRAY_SIZE(max77836_devs);
		irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
		break;
	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		irq_chip = &max14577_irq_chip;
		mfd_devs = max14577_devs;
		mfd_devs_size = ARRAY_SIZE(max14577_devs);
		irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
		break;
	}

	ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
				  irq_flags, 0, irq_chip,
				  &max14577->irq_data);
	if (ret != 0) {
		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
				max14577->irq, ret);
		return ret;
	}

	/* Max77836 specific initialization code (additional regmap) */
	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {
		ret = max77836_init(max14577);
		if (ret < 0)
			goto err_max77836;
	}

	ret = mfd_add_devices(max14577->dev, -1, mfd_devs,
			mfd_devs_size, NULL, 0, NULL);
	if (ret < 0)
		goto err_mfd;

	device_init_wakeup(max14577->dev, 1);

	return 0;

err_mfd:
	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
		max77836_remove(max14577);
err_max77836:
	regmap_del_irq_chip(max14577->irq, max14577->irq_data);

	return ret;
}

static int max14577_i2c_remove(struct i2c_client *i2c)
{
	struct max14577 *max14577 = i2c_get_clientdata(i2c);

	mfd_remove_devices(max14577->dev);
	regmap_del_irq_chip(max14577->irq, max14577->irq_data);
	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
		max77836_remove(max14577);

	return 0;
}

static const struct i2c_device_id max14577_i2c_id[] = {
	{ "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
	{ "max77836", MAXIM_DEVICE_TYPE_MAX77836, },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);

#ifdef CONFIG_PM_SLEEP
static int max14577_suspend(struct device *dev)
{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max14577 *max14577 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
		enable_irq_wake(max14577->irq);
	/*
	 * MUIC IRQ must be disabled during suspend because if it happens
	 * while suspended it will be handled before resuming I2C.
	 *
	 * When device is woken up from suspend (e.g. by ADC change),
	 * an interrupt occurs before resuming I2C bus controller.
	 * Interrupt handler tries to read registers but this read
	 * will fail because I2C is still suspended.
	 */
	disable_irq(max14577->irq);

	return 0;
}

static int max14577_resume(struct device *dev)
{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max14577 *max14577 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
		disable_irq_wake(max14577->irq);
	enable_irq(max14577->irq);

	return 0;
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);

static struct i2c_driver max14577_i2c_driver = {
	.driver = {
		.name = "max14577",
		.pm = &max14577_pm,
		.of_match_table = max14577_dt_match,
	},
	.probe = max14577_i2c_probe,
	.remove = max14577_i2c_remove,
	.id_table = max14577_i2c_id,
};

static int __init max14577_i2c_init(void)
{
	BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
	BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);

	/* Valid charger current values must be provided for each chipset */
	BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);

	/* Check for valid values for charger */
	BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START +
			MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
			MAX14577_CHARGER_CURRENT_LIMIT_MAX);
	BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);

	BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START +
			MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
			MAX77836_CHARGER_CURRENT_LIMIT_MAX);
	BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);

	return i2c_add_driver(&max14577_i2c_driver);
}
module_init(max14577_i2c_init);

static void __exit max14577_i2c_exit(void)
{
	i2c_del_driver(&max14577_i2c_driver);
}
module_exit(max14577_i2c_exit);

MODULE_AUTHOR("Chanwoo Choi <[email protected]>, Krzysztof Kozlowski <[email protected]>");
MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
d7d8d7a2 KK	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// max14577.c - mfd core driver for the Maxim 14577/77836
	4	//
	5	// Copyright (C) 2014 Samsung Electronics
	6	// Chanwoo Choi <[email protected]>
	7	// Krzysztof Kozlowski <[email protected]>
	8	//
	9	// This driver is based on max8997.c
3008ddbe	10
c8016d45	11	#include <linux/err.h>
3008ddbe CC	12	#include <linux/module.h>
3008ddbe CC	13	#include <linux/interrupt.h>
eccb80cc	14	#include <linux/of_device.h>
3008ddbe CC	15	#include <linux/mfd/core.h>
	16	#include <linux/mfd/max14577.h>
	17	#include <linux/mfd/max14577-private.h>
	18
b8f139f6 KK	19	/*
	20	* Table of valid charger currents for different Maxim chipsets.
	21	* It is placed here because it is used by both charger and regulator driver.
	22	*/
	23	const struct maxim_charger_current maxim_charger_currents[] = {
	24	[MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
	25	[MAXIM_DEVICE_TYPE_MAX14577] = {
	26	.min = MAX14577_CHARGER_CURRENT_LIMIT_MIN,
	27	.high_start = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START,
	28	.high_step = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP,
	29	.max = MAX14577_CHARGER_CURRENT_LIMIT_MAX,
	30	},
	31	[MAXIM_DEVICE_TYPE_MAX77836] = {
	32	.min = MAX77836_CHARGER_CURRENT_LIMIT_MIN,
	33	.high_start = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START,
	34	.high_step = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP,
	35	.max = MAX77836_CHARGER_CURRENT_LIMIT_MAX,
	36	},
	37	};
	38	EXPORT_SYMBOL_GPL(maxim_charger_currents);
	39
	40	/*
	41	* maxim_charger_calc_reg_current - Calculate register value for current
	42	* @limits: constraints for charger, matching the MBCICHWRC register
	43	* @min_ua: minimal requested current, micro Amps
	44	* @max_ua: maximum requested current, micro Amps
	45	* @dst: destination to store calculated register value
	46	*
	47	* Calculates the value of MBCICHWRC (Fast Battery Charge Current) register
	48	* for given current and stores it under pointed 'dst'. The stored value
	49	* combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also
	50	* properly shifted.
	51	*
	52	* The calculated register value matches the current which:
	53	* - is always between <limits.min, limits.max>;
	54	* - is always less or equal to max_ua;
	55	* - is the highest possible value;
	56	* - may be lower than min_ua.
	57	*
	58	* On success returns 0. On error returns -EINVAL (requested min/max current
	59	* is outside of given charger limits) and 'dst' is not set.
	60	*/
	61	int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits,
	62	unsigned int min_ua, unsigned int max_ua, u8 *dst)
	63	{
	64	unsigned int current_bits = 0xf;
	65
	66	if (min_ua > max_ua)
	67	return -EINVAL;
	68
	69	if (min_ua > limits->max \|\| max_ua < limits->min)
	70	return -EINVAL;
	71
	72	if (max_ua < limits->high_start) {
	73	/*
	74	* Less than high_start, so set the minimal current
	75	* (turn Low Bit off, 0 as high bits).
	76	*/
	77	*dst = 0x0;
	78	return 0;
	79	}
	80
	81	/* max_ua is in range: <high_start, infinite>, cut it to limits.max */
	82	max_ua = min(limits->max, max_ua);
83	max_ua -= limits->high_start;
84	/*
85	* There is no risk of overflow 'max_ua' here because:
86	* - max_ua >= limits.high_start
87	* - BUILD_BUG checks that 'limits' are: max >= high_start + high_step
88	*/
89	current_bits = max_ua / limits->high_step;
90
91	/* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */
92	*dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
93	/* and set proper High Bits */
94	*dst \|= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
95
96	return 0;
97	}
98	EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current);
99
92725493	100	static const struct mfd_cell max14577_devs[] = {
a0b0ea49 KK	101	{
	102	.name = "max14577-muic",
	103	.of_compatible = "maxim,max14577-muic",
	104	},
41096801 KK	105	{
	106	.name = "max14577-regulator",
	107	.of_compatible = "maxim,max14577-regulator",
	108	},
4476767c KK	109	{
	110	.name = "max14577-charger",
	111	.of_compatible = "maxim,max14577-charger",
	112	},
3008ddbe CC	113	};
3008ddbe CC	114
92725493	115	static const struct mfd_cell max77836_devs[] = {
aee2a57c KK	116	{
	117	.name = "max77836-muic",
	118	.of_compatible = "maxim,max77836-muic",
	119	},
	120	{
	121	.name = "max77836-regulator",
	122	.of_compatible = "maxim,max77836-regulator",
	123	},
	124	{
	125	.name = "max77836-charger",
	126	.of_compatible = "maxim,max77836-charger",
	127	},
	128	{
	129	.name = "max77836-battery",
	130	.of_compatible = "maxim,max77836-battery",
	131	},
	132	};
	133
8f7f6270	134	static const struct of_device_id max14577_dt_match[] = {
eccb80cc KK	135	{
	136	.compatible = "maxim,max14577",
	137	.data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
	138	},
aee2a57c KK	139	{
	140	.compatible = "maxim,max77836",
	141	.data = (void *)MAXIM_DEVICE_TYPE_MAX77836,
	142	},
eccb80cc KK	143	{},
	144	};
	145
575343d1	146	static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg)
3008ddbe CC	147	{
	148	switch (reg) {
	149	case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
	150	return true;
	151	default:
	152	break;
	153	}
	154	return false;
	155	}
	156
aee2a57c KK	157	static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg)
	158	{
	159	/* Any max14577 volatile registers are also max77836 volatile. */
	160	if (max14577_muic_volatile_reg(dev, reg))
	161	return true;
	162
	163	switch (reg) {
	164	case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB:
	165	case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB:
	166	case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L:
	167	case MAX77836_PMIC_REG_INTSRC:
	168	case MAX77836_PMIC_REG_TOPSYS_INT:
	169	case MAX77836_PMIC_REG_TOPSYS_STAT:
	170	return true;
	171	default:
	172	break;
	173	}
	174	return false;
	175	}
	176
575343d1	177	static const struct regmap_config max14577_muic_regmap_config = {
3008ddbe CC	178	.reg_bits = 8,
3008ddbe CC	179	.val_bits = 8,
575343d1	180	.volatile_reg = max14577_muic_volatile_reg,
3008ddbe CC	181	.max_register = MAX14577_REG_END,
	182	};
	183
aee2a57c KK	184	static const struct regmap_config max77836_pmic_regmap_config = {
	185	.reg_bits = 8,
	186	.val_bits = 8,
	187	.volatile_reg = max77836_muic_volatile_reg,
	188	.max_register = MAX77836_PMIC_REG_END,
	189	};
	190
3008ddbe CC	191	static const struct regmap_irq max14577_irqs[] = {
3008ddbe CC	192	/* INT1 interrupts */
c7846852 KK	193	{ .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
	194	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
	195	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
3008ddbe	196	/* INT2 interrupts */
c7846852 KK	197	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
	198	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
	199	{ .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
	200	{ .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
	201	{ .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
3008ddbe	202	/* INT3 interrupts */
c7846852 KK	203	{ .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
	204	{ .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
	205	{ .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
	206	{ .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
3008ddbe CC	207	};
	208
	209	static const struct regmap_irq_chip max14577_irq_chip = {
	210	.name = "max14577",
	211	.status_base = MAX14577_REG_INT1,
	212	.mask_base = MAX14577_REG_INTMASK1,
aee2a57c	213	.mask_invert = true,
3008ddbe CC	214	.num_regs = 3,
	215	.irqs = max14577_irqs,
	216	.num_irqs = ARRAY_SIZE(max14577_irqs),
	217	};
	218
aee2a57c KK	219	static const struct regmap_irq max77836_muic_irqs[] = {
	220	/* INT1 interrupts */
	221	{ .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
	222	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
	223	{ .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
4706a525	224	{ .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, },
aee2a57c KK	225	/* INT2 interrupts */
	226	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
	227	{ .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
	228	{ .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
	229	{ .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
	230	{ .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
	231	{ .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, },
	232	/* INT3 interrupts */
	233	{ .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
	234	{ .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
	235	{ .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
	236	{ .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
	237	};
	238
	239	static const struct regmap_irq_chip max77836_muic_irq_chip = {
	240	.name = "max77836-muic",
	241	.status_base = MAX14577_REG_INT1,
	242	.mask_base = MAX14577_REG_INTMASK1,
	243	.mask_invert = true,
	244	.num_regs = 3,
	245	.irqs = max77836_muic_irqs,
	246	.num_irqs = ARRAY_SIZE(max77836_muic_irqs),
	247	};
	248
	249	static const struct regmap_irq max77836_pmic_irqs[] = {
	250	{ .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, },
	251	{ .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, },
	252	};
	253
	254	static const struct regmap_irq_chip max77836_pmic_irq_chip = {
	255	.name = "max77836-pmic",
	256	.status_base = MAX77836_PMIC_REG_TOPSYS_INT,
	257	.mask_base = MAX77836_PMIC_REG_TOPSYS_INT_MASK,
	258	.mask_invert = false,
	259	.num_regs = 1,
	260	.irqs = max77836_pmic_irqs,
	261	.num_irqs = ARRAY_SIZE(max77836_pmic_irqs),
	262	};
	263
eccb80cc KK	264	static void max14577_print_dev_type(struct max14577 *max14577)
	265	{
	266	u8 reg_data, vendor_id, device_id;
	267	int ret;
	268
	269	ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
	270	&reg_data);
	271	if (ret) {
	272	dev_err(max14577->dev,
	273	"Failed to read DEVICEID register: %d\n", ret);
	274	return;
	275	}
	276
	277	vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
	278	DEVID_VENDORID_SHIFT);
	279	device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
	280	DEVID_DEVICEID_SHIFT);
	281
	282	dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
	283	max14577->dev_type, device_id, vendor_id);
	284	}
	285
aee2a57c KK	286	/*
	287	* Max77836 specific initialization code for driver probe.
	288	* Adds new I2C dummy device, regmap and regmap IRQ chip.
	289	* Unmasks Interrupt Source register.
	290	*
	291	* On success returns 0.
	292	* On failure returns errno and reverts any changes done so far (e.g. remove
	293	* I2C dummy device), except masking the INT SRC register.
	294	*/
	295	static int max77836_init(struct max14577 *max14577)
	296	{
	297	int ret;
	298	u8 intsrc_mask;
	299
	300	max14577->i2c_pmic = i2c_new_dummy(max14577->i2c->adapter,
	301	I2C_ADDR_PMIC);
	302	if (!max14577->i2c_pmic) {
	303	dev_err(max14577->dev, "Failed to register PMIC I2C device\n");
	304	return -ENODEV;
	305	}
	306	i2c_set_clientdata(max14577->i2c_pmic, max14577);
	307
	308	max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,
	309	&max77836_pmic_regmap_config);
	310	if (IS_ERR(max14577->regmap_pmic)) {
	311	ret = PTR_ERR(max14577->regmap_pmic);
	312	dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",
	313	ret);
	314	goto err;
	315	}
	316
	317	/* Un-mask MAX77836 Interrupt Source register */
	318	ret = max14577_read_reg(max14577->regmap_pmic,
	319	MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask);
	320	if (ret < 0) {
	321	dev_err(max14577->dev, "Failed to read PMIC register\n");
	322	goto err;
	323	}
	324
	325	intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK);
	326	intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK);
	327	ret = max14577_write_reg(max14577->regmap_pmic,
	328	MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask);
	329	if (ret < 0) {
	330	dev_err(max14577->dev, "Failed to write PMIC register\n");
	331	goto err;
	332	}
	333
	334	ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,
	335	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT \| IRQF_SHARED,
	336	0, &max77836_pmic_irq_chip,
	337	&max14577->irq_data_pmic);
	338	if (ret != 0) {
	339	dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",
	340	max14577->irq, ret);
	341	goto err;
	342	}
	343
	344	return 0;
	345
	346	err:
	347	i2c_unregister_device(max14577->i2c_pmic);
	348
	349	return ret;
350	}
351
352	/*
353	* Max77836 specific de-initialization code for driver remove.
354	*/
355	static void max77836_remove(struct max14577 *max14577)
356	{
357	regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);
358	i2c_unregister_device(max14577->i2c_pmic);
359	}
360
3008ddbe CC	361	static int max14577_i2c_probe(struct i2c_client *i2c,
	362	const struct i2c_device_id *id)
	363	{
	364	struct max14577 *max14577;
	365	struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
	366	struct device_node *np = i2c->dev.of_node;
3008ddbe	367	int ret = 0;
aee2a57c	368	const struct regmap_irq_chip *irq_chip;
92725493	369	const struct mfd_cell *mfd_devs;
aee2a57c KK	370	unsigned int mfd_devs_size;
aee2a57c KK	371	int irq_flags;
3008ddbe CC	372
	373	if (np) {
	374	pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
	375	if (!pdata)
	376	return -ENOMEM;
	377	i2c->dev.platform_data = pdata;
	378	}
	379
	380	if (!pdata) {
aab5dc68	381	dev_err(&i2c->dev, "No platform data found.\n");
3008ddbe CC	382	return -EINVAL;
	383	}
	384
	385	max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
	386	if (!max14577)
	387	return -ENOMEM;
	388
	389	i2c_set_clientdata(i2c, max14577);
	390	max14577->dev = &i2c->dev;
	391	max14577->i2c = i2c;
	392	max14577->irq = i2c->irq;
	393
575343d1 KK	394	max14577->regmap = devm_regmap_init_i2c(i2c,
575343d1 KK	395	&max14577_muic_regmap_config);
3008ddbe CC	396	if (IS_ERR(max14577->regmap)) {
	397	ret = PTR_ERR(max14577->regmap);
	398	dev_err(max14577->dev, "Failed to allocate register map: %d\n",
	399	ret);
	400	return ret;
	401	}
	402
eccb80cc KK	403	if (np) {
	404	const struct of_device_id *of_id;
	405
	406	of_id = of_match_device(max14577_dt_match, &i2c->dev);
	407	if (of_id)
fab8445c LJ	408	max14577->dev_type =
fab8445c LJ	409	(enum maxim_device_type)of_id->data;
eccb80cc KK	410	} else {
eccb80cc KK	411	max14577->dev_type = id->driver_data;
3008ddbe	412	}
eccb80cc KK	413
eccb80cc KK	414	max14577_print_dev_type(max14577);
3008ddbe	415
aee2a57c KK	416	switch (max14577->dev_type) {
	417	case MAXIM_DEVICE_TYPE_MAX77836:
	418	irq_chip = &max77836_muic_irq_chip;
	419	mfd_devs = max77836_devs;
	420	mfd_devs_size = ARRAY_SIZE(max77836_devs);
	421	irq_flags = IRQF_TRIGGER_FALLING \| IRQF_ONESHOT \| IRQF_SHARED;
	422	break;
	423	case MAXIM_DEVICE_TYPE_MAX14577:
	424	default:
	425	irq_chip = &max14577_irq_chip;
	426	mfd_devs = max14577_devs;
	427	mfd_devs_size = ARRAY_SIZE(max14577_devs);
	428	irq_flags = IRQF_TRIGGER_FALLING \| IRQF_ONESHOT;
	429	break;
	430	}
	431
3008ddbe	432	ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
aee2a57c	433	irq_flags, 0, irq_chip,
3008ddbe CC	434	&max14577->irq_data);
	435	if (ret != 0) {
	436	dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
	437	max14577->irq, ret);
	438	return ret;
	439	}
	440
aee2a57c KK	441	/* Max77836 specific initialization code (additional regmap) */
	442	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {
	443	ret = max77836_init(max14577);
	444	if (ret < 0)
	445	goto err_max77836;
	446	}
	447
	448	ret = mfd_add_devices(max14577->dev, -1, mfd_devs,
be69e9e0	449	mfd_devs_size, NULL, 0, NULL);
3008ddbe CC	450	if (ret < 0)
	451	goto err_mfd;
	452
	453	device_init_wakeup(max14577->dev, 1);
	454
	455	return 0;
	456
	457	err_mfd:
aee2a57c KK	458	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
	459	max77836_remove(max14577);
	460	err_max77836:
3008ddbe CC	461	regmap_del_irq_chip(max14577->irq, max14577->irq_data);
	462
	463	return ret;
	464	}
	465
	466	static int max14577_i2c_remove(struct i2c_client *i2c)
	467	{
	468	struct max14577 *max14577 = i2c_get_clientdata(i2c);
	469
	470	mfd_remove_devices(max14577->dev);
	471	regmap_del_irq_chip(max14577->irq, max14577->irq_data);
aee2a57c KK	472	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
aee2a57c KK	473	max77836_remove(max14577);
3008ddbe CC	474
	475	return 0;
	476	}
	477
	478	static const struct i2c_device_id max14577_i2c_id[] = {
eccb80cc	479	{ "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
aee2a57c	480	{ "max77836", MAXIM_DEVICE_TYPE_MAX77836, },
3008ddbe CC	481	{ }
	482	};
	483	MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
	484
3edeb1e4	485	#ifdef CONFIG_PM_SLEEP
3008ddbe CC	486	static int max14577_suspend(struct device *dev)
3008ddbe CC	487	{
1b5420e1	488	struct i2c_client *i2c = to_i2c_client(dev);
3008ddbe CC	489	struct max14577 *max14577 = i2c_get_clientdata(i2c);
3008ddbe CC	490
c4f725b5	491	if (device_may_wakeup(dev))
3008ddbe	492	enable_irq_wake(max14577->irq);
c4f725b5 KK	493	/*
	494	* MUIC IRQ must be disabled during suspend because if it happens
	495	* while suspended it will be handled before resuming I2C.
	496	*
	497	* When device is woken up from suspend (e.g. by ADC change),
	498	* an interrupt occurs before resuming I2C bus controller.
	499	* Interrupt handler tries to read registers but this read
	500	* will fail because I2C is still suspended.
	501	*/
	502	disable_irq(max14577->irq);
3008ddbe CC	503
	504	return 0;
	505	}
	506
	507	static int max14577_resume(struct device *dev)
	508	{
1b5420e1	509	struct i2c_client *i2c = to_i2c_client(dev);
3008ddbe CC	510	struct max14577 *max14577 = i2c_get_clientdata(i2c);
3008ddbe CC	511
c4f725b5	512	if (device_may_wakeup(dev))
3008ddbe	513	disable_irq_wake(max14577->irq);
c4f725b5	514	enable_irq(max14577->irq);
3008ddbe CC	515
	516	return 0;
	517	}
3edeb1e4	518	#endif /* CONFIG_PM_SLEEP */
3008ddbe	519
3008ddbe CC	520	static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
	521
	522	static struct i2c_driver max14577_i2c_driver = {
	523	.driver = {
	524	.name = "max14577",
3008ddbe	525	.pm = &max14577_pm,
ae679c12	526	.of_match_table = max14577_dt_match,
3008ddbe CC	527	},
	528	.probe = max14577_i2c_probe,
	529	.remove = max14577_i2c_remove,
	530	.id_table = max14577_i2c_id,
	531	};
	532
	533	static int __init max14577_i2c_init(void)
	534	{
eccb80cc KK	535	BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
	536	BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);
	537
b8f139f6 KK	538	/* Valid charger current values must be provided for each chipset */
	539	BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);
	540
	541	/* Check for valid values for charger */
	542	BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START +
	543	MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
	544	MAX14577_CHARGER_CURRENT_LIMIT_MAX);
	545	BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
	546
	547	BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START +
	548	MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
	549	MAX77836_CHARGER_CURRENT_LIMIT_MAX);
	550	BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
	551
3008ddbe CC	552	return i2c_add_driver(&max14577_i2c_driver);
3008ddbe CC	553	}
9961bf18	554	module_init(max14577_i2c_init);
3008ddbe CC	555
	556	static void __exit max14577_i2c_exit(void)
	557	{
	558	i2c_del_driver(&max14577_i2c_driver);
	559	}
	560	module_exit(max14577_i2c_exit);
	561
8c5d0571	562	MODULE_AUTHOR("Chanwoo Choi <[email protected]>, Krzysztof Kozlowski <[email protected]>");
aee2a57c	563	MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");
3008ddbe	564	MODULE_LICENSE("GPL");