[mirror_ubuntu-jammy-kernel.git] / drivers / regulator / max8660.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * max8660.c  --  Voltage regulation for the Maxim 8660/8661
 *
 * based on max1586.c and wm8400-regulator.c
 *
 * Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
 *
 * Some info:
 *
 * Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
 *
 * This chip is a bit nasty because it is a write-only device. Thus, the driver
 * uses shadow registers to keep track of its values. The main problem appears
 * to be the initialization: When Linux boots up, we cannot know if the chip is
 * in the default state or not, so we would have to pass such information in
 * platform_data. As this adds a bit of complexity to the driver, this is left
 * out for now until it is really needed.
 *
 * [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2.
 *
 * If the driver is feature complete, it might be worth to check if one set of
 * functions for V3-V7 is sufficient. For maximum flexibility during
 * development, they are separated for now.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max8660.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>

#define MAX8660_DCDC_MIN_UV	 725000
#define MAX8660_DCDC_MAX_UV	1800000
#define MAX8660_DCDC_STEP	  25000
#define MAX8660_DCDC_MAX_SEL	0x2b

#define MAX8660_LDO5_MIN_UV	1700000
#define MAX8660_LDO5_MAX_UV	2000000
#define MAX8660_LDO5_STEP	  25000
#define MAX8660_LDO5_MAX_SEL	0x0c

#define MAX8660_LDO67_MIN_UV	1800000
#define MAX8660_LDO67_MAX_UV	3300000
#define MAX8660_LDO67_STEP	 100000
#define MAX8660_LDO67_MAX_SEL	0x0f

enum {
	MAX8660_OVER1,
	MAX8660_OVER2,
	MAX8660_VCC1,
	MAX8660_ADTV1,
	MAX8660_ADTV2,
	MAX8660_SDTV1,
	MAX8660_SDTV2,
	MAX8660_MDTV1,
	MAX8660_MDTV2,
	MAX8660_L12VCR,
	MAX8660_FPWM,
	MAX8660_N_REGS,	/* not a real register */
};

struct max8660 {
	struct i2c_client *client;
	u8 shadow_regs[MAX8660_N_REGS];		/* as chip is write only */
};

static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
{
	static const u8 max8660_addresses[MAX8660_N_REGS] = {
	 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80
	};

	int ret;
	u8 reg_val = (max8660->shadow_regs[reg] & mask) | val;

	dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
			max8660_addresses[reg], reg_val);

	ret = i2c_smbus_write_byte_data(max8660->client,
			max8660_addresses[reg], reg_val);
	if (ret == 0)
		max8660->shadow_regs[reg] = reg_val;

	return ret;
}


/*
 * DCDC functions
 */

static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 val = max8660->shadow_regs[MAX8660_OVER1];
	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;

	return !!(val & mask);
}

static int max8660_dcdc_enable(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;

	return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
}

static int max8660_dcdc_disable(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;

	return max8660_write(max8660, MAX8660_OVER1, mask, 0);
}

static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	u8 selector = max8660->shadow_regs[reg];

	return selector;
}

static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
					unsigned int selector)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 reg, bits;
	int ret;

	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	ret = max8660_write(max8660, reg, 0, selector);
	if (ret)
		return ret;

	/* Select target voltage register and activate regulation */
	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
}

static struct regulator_ops max8660_dcdc_ops = {
	.is_enabled = max8660_dcdc_is_enabled,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.set_voltage_sel = max8660_dcdc_set_voltage_sel,
	.get_voltage_sel = max8660_dcdc_get_voltage_sel,
};


/*
 * LDO5 functions
 */

static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);

	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
	return selector;
}

static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
					unsigned int selector)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	int ret;

	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	if (ret)
		return ret;

	/* Select target voltage register and activate regulation */
	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
}

static const struct regulator_ops max8660_ldo5_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.set_voltage_sel = max8660_ldo5_set_voltage_sel,
	.get_voltage_sel = max8660_ldo5_get_voltage_sel,
};


/*
 * LDO67 functions
 */

static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;

	return !!(val & mask);
}

static int max8660_ldo67_enable(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;

	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
}

static int max8660_ldo67_disable(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;

	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
}

static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;

	return selector;
}

static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
					 unsigned int selector)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);

	if (rdev_get_id(rdev) == MAX8660_V6)
		return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	else
		return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
				     selector << 4);
}

static const struct regulator_ops max8660_ldo67_ops = {
	.is_enabled = max8660_ldo67_is_enabled,
	.enable = max8660_ldo67_enable,
	.disable = max8660_ldo67_disable,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = max8660_ldo67_get_voltage_sel,
	.set_voltage_sel = max8660_ldo67_set_voltage_sel,
};

static const struct regulator_desc max8660_reg[] = {
	{
		.name = "V3(DCDC)",
		.id = MAX8660_V3,
		.ops = &max8660_dcdc_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
		.owner = THIS_MODULE,
		.min_uV = MAX8660_DCDC_MIN_UV,
		.uV_step = MAX8660_DCDC_STEP,
	},
	{
		.name = "V4(DCDC)",
		.id = MAX8660_V4,
		.ops = &max8660_dcdc_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
		.owner = THIS_MODULE,
		.min_uV = MAX8660_DCDC_MIN_UV,
		.uV_step = MAX8660_DCDC_STEP,
	},
	{
		.name = "V5(LDO)",
		.id = MAX8660_V5,
		.ops = &max8660_ldo5_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
		.owner = THIS_MODULE,
		.min_uV = MAX8660_LDO5_MIN_UV,
		.uV_step = MAX8660_LDO5_STEP,
	},
	{
		.name = "V6(LDO)",
		.id = MAX8660_V6,
		.ops = &max8660_ldo67_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
		.owner = THIS_MODULE,
		.min_uV = MAX8660_LDO67_MIN_UV,
		.uV_step = MAX8660_LDO67_STEP,
	},
	{
		.name = "V7(LDO)",
		.id = MAX8660_V7,
		.ops = &max8660_ldo67_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
		.owner = THIS_MODULE,
		.min_uV = MAX8660_LDO67_MIN_UV,
		.uV_step = MAX8660_LDO67_STEP,
	},
};

enum {
	MAX8660 = 0,
	MAX8661 = 1,
};

#ifdef CONFIG_OF
static const struct of_device_id max8660_dt_ids[] = {
	{ .compatible = "maxim,max8660", .data = (void *) MAX8660 },
	{ .compatible = "maxim,max8661", .data = (void *) MAX8661 },
	{ }
};
MODULE_DEVICE_TABLE(of, max8660_dt_ids);

static int max8660_pdata_from_dt(struct device *dev,
				 struct device_node **of_node,
				 struct max8660_platform_data *pdata)
{
	int matched, i;
	struct device_node *np;
	struct max8660_subdev_data *sub;
	struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { };

	np = of_get_child_by_name(dev->of_node, "regulators");
	if (!np) {
		dev_err(dev, "missing 'regulators' subnode in DT\n");
		return -EINVAL;
	}

	for (i = 0; i < ARRAY_SIZE(rmatch); i++)
		rmatch[i].name = max8660_reg[i].name;

	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
	of_node_put(np);
	if (matched <= 0)
		return matched;

	pdata->subdevs = devm_kcalloc(dev,
				      matched,
				      sizeof(struct max8660_subdev_data),
				      GFP_KERNEL);
	if (!pdata->subdevs)
		return -ENOMEM;

	pdata->num_subdevs = matched;
	sub = pdata->subdevs;

	for (i = 0; i < matched; i++) {
		sub->id = i;
		sub->name = rmatch[i].name;
		sub->platform_data = rmatch[i].init_data;
		of_node[i] = rmatch[i].of_node;
		sub++;
	}

	return 0;
}
#else
static inline int max8660_pdata_from_dt(struct device *dev,
					struct device_node **of_node,
					struct max8660_platform_data *pdata)
{
	return 0;
}
#endif

static int max8660_probe(struct i2c_client *client,
				   const struct i2c_device_id *i2c_id)
{
	struct device *dev = &client->dev;
	struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
	struct regulator_config config = { };
	struct max8660 *max8660;
	int boot_on, i, id, ret = -EINVAL;
	struct device_node *of_node[MAX8660_V_END];
	unsigned long type;

	if (dev->of_node && !pdata) {
		const struct of_device_id *id;

		id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
		if (!id)
			return -ENODEV;

		ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
		if (ret < 0)
			return ret;

		pdata = &pdata_of;
		type = (unsigned long) id->data;
	} else {
		type = i2c_id->driver_data;
		memset(of_node, 0, sizeof(of_node));
	}

	if (pdata->num_subdevs > MAX8660_V_END) {
		dev_err(dev, "Too many regulators found!\n");
		return -EINVAL;
	}

	max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
	if (!max8660)
		return -ENOMEM;

	max8660->client = client;

	if (pdata->en34_is_high) {
		/* Simulate always on */
		max8660->shadow_regs[MAX8660_OVER1] = 5;
	} else {
		/* Otherwise devices can be toggled via software */
		max8660_dcdc_ops.enable = max8660_dcdc_enable;
		max8660_dcdc_ops.disable = max8660_dcdc_disable;
	}

	/*
	 * First, set up shadow registers to prevent glitches. As some
	 * registers are shared between regulators, everything must be properly
	 * set up for all regulators in advance.
	 */
	max8660->shadow_regs[MAX8660_ADTV1] =
		max8660->shadow_regs[MAX8660_ADTV2] =
		max8660->shadow_regs[MAX8660_SDTV1] =
		max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	max8660->shadow_regs[MAX8660_MDTV1] =
		max8660->shadow_regs[MAX8660_MDTV2] = 0x04;

	for (i = 0; i < pdata->num_subdevs; i++) {

		if (!pdata->subdevs[i].platform_data)
			boot_on = false;
		else
			boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;

		switch (pdata->subdevs[i].id) {
		case MAX8660_V3:
			if (boot_on)
				max8660->shadow_regs[MAX8660_OVER1] |= 1;
			break;

		case MAX8660_V4:
			if (boot_on)
				max8660->shadow_regs[MAX8660_OVER1] |= 4;
			break;

		case MAX8660_V5:
			break;

		case MAX8660_V6:
			if (boot_on)
				max8660->shadow_regs[MAX8660_OVER2] |= 2;
			break;

		case MAX8660_V7:
			if (type == MAX8661) {
				dev_err(dev, "Regulator not on this chip!\n");
				return -EINVAL;
			}

			if (boot_on)
				max8660->shadow_regs[MAX8660_OVER2] |= 4;
			break;

		default:
			dev_err(dev, "invalid regulator %s\n",
				 pdata->subdevs[i].name);
			return ret;
		}
	}

	/* Finally register devices */
	for (i = 0; i < pdata->num_subdevs; i++) {
		struct regulator_dev *rdev;

		id = pdata->subdevs[i].id;

		config.dev = dev;
		config.init_data = pdata->subdevs[i].platform_data;
		config.of_node = of_node[i];
		config.driver_data = max8660;

		rdev = devm_regulator_register(&client->dev,
						  &max8660_reg[id], &config);
		if (IS_ERR(rdev)) {
			dev_err(&client->dev, "failed to register %s\n",
				max8660_reg[id].name);
			return PTR_ERR(rdev);
		}
	}

	i2c_set_clientdata(client, max8660);
	return 0;
}

static const struct i2c_device_id max8660_id[] = {
	{ .name = "max8660", .driver_data = MAX8660 },
	{ .name = "max8661", .driver_data = MAX8661 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max8660_id);

static struct i2c_driver max8660_driver = {
	.probe = max8660_probe,
	.driver		= {
		.name	= "max8660",
	},
	.id_table	= max8660_id,
};

static int __init max8660_init(void)
{
	return i2c_add_driver(&max8660_driver);
}
subsys_initcall(max8660_init);

static void __exit max8660_exit(void)
{
	i2c_del_driver(&max8660_driver);
}
module_exit(max8660_exit);

/* Module information */
MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
MODULE_AUTHOR("Wolfram Sang");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
873e65bc	1	// SPDX-License-Identifier: GPL-2.0-only
27f37e4b WS	2	/*
	3	* max8660.c -- Voltage regulation for the Maxim 8660/8661
	4	*
	5	* based on max1586.c and wm8400-regulator.c
	6	*
	7	* Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
	8	*
27f37e4b WS	9	* Some info:
	10	*
	11	* Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
	12	*
	13	* This chip is a bit nasty because it is a write-only device. Thus, the driver
	14	* uses shadow registers to keep track of its values. The main problem appears
	15	* to be the initialization: When Linux boots up, we cannot know if the chip is
	16	* in the default state or not, so we would have to pass such information in
	17	* platform_data. As this adds a bit of complexity to the driver, this is left
	18	* out for now until it is really needed.
	19	*
	20	* [A\|S\|M]DTV1 registers are currently not used, but [A\|S\|M]DTV2.
	21	*
	22	* If the driver is feature complete, it might be worth to check if one set of
	23	* functions for V3-V7 is sufficient. For maximum flexibility during
	24	* development, they are separated for now.
27f37e4b WS	25	*/
	26
	27	#include <linux/module.h>
	28	#include <linux/err.h>
	29	#include <linux/i2c.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/regulator/driver.h>
5a0e3ad6	32	#include <linux/slab.h>
27f37e4b	33	#include <linux/regulator/max8660.h>
abe4c51a DM	34	#include <linux/of.h>
	35	#include <linux/of_device.h>
	36	#include <linux/regulator/of_regulator.h>
27f37e4b WS	37
	38	#define MAX8660_DCDC_MIN_UV 725000
	39	#define MAX8660_DCDC_MAX_UV 1800000
	40	#define MAX8660_DCDC_STEP 25000
	41	#define MAX8660_DCDC_MAX_SEL 0x2b
	42
	43	#define MAX8660_LDO5_MIN_UV 1700000
	44	#define MAX8660_LDO5_MAX_UV 2000000
	45	#define MAX8660_LDO5_STEP 25000
	46	#define MAX8660_LDO5_MAX_SEL 0x0c
	47
	48	#define MAX8660_LDO67_MIN_UV 1800000
	49	#define MAX8660_LDO67_MAX_UV 3300000
	50	#define MAX8660_LDO67_STEP 100000
	51	#define MAX8660_LDO67_MAX_SEL 0x0f
	52
	53	enum {
	54	MAX8660_OVER1,
	55	MAX8660_OVER2,
	56	MAX8660_VCC1,
	57	MAX8660_ADTV1,
	58	MAX8660_ADTV2,
	59	MAX8660_SDTV1,
	60	MAX8660_SDTV2,
	61	MAX8660_MDTV1,
	62	MAX8660_MDTV2,
	63	MAX8660_L12VCR,
	64	MAX8660_FPWM,
	65	MAX8660_N_REGS, /* not a real register */
	66	};
	67
	68	struct max8660 {
	69	struct i2c_client *client;
	70	u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
27f37e4b WS	71	};
	72
	73	static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
	74	{
f920ec79	75	static const u8 max8660_addresses[MAX8660_N_REGS] = {
dda5e36b SK	76	0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80
dda5e36b SK	77	};
27f37e4b WS	78
	79	int ret;
	80	u8 reg_val = (max8660->shadow_regs[reg] & mask) \| val;
f920ec79	81
27f37e4b WS	82	dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
	83	max8660_addresses[reg], reg_val);
	84
	85	ret = i2c_smbus_write_byte_data(max8660->client,
	86	max8660_addresses[reg], reg_val);
	87	if (ret == 0)
	88	max8660->shadow_regs[reg] = reg_val;
	89
	90	return ret;
	91	}
	92
	93
	94	/*
	95	* DCDC functions
	96	*/
	97
	98	static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
	99	{
	100	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	101	u8 val = max8660->shadow_regs[MAX8660_OVER1];
	102	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
f920ec79	103
27f37e4b WS	104	return !!(val & mask);
	105	}
	106
	107	static int max8660_dcdc_enable(struct regulator_dev *rdev)
	108	{
	109	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	110	u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
f920ec79	111
27f37e4b WS	112	return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
	113	}
	114
	115	static int max8660_dcdc_disable(struct regulator_dev *rdev)
	116	{
	117	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	118	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
f920ec79	119
27f37e4b WS	120	return max8660_write(max8660, MAX8660_OVER1, mask, 0);
	121	}
	122
9392c4f0	123	static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	124	{
	125	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	126	u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	127	u8 selector = max8660->shadow_regs[reg];
f920ec79	128
9392c4f0	129	return selector;
27f37e4b WS	130	}
27f37e4b WS	131
5eb3394f AL	132	static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	133	unsigned int selector)
27f37e4b WS	134	{
27f37e4b WS	135	struct max8660 *max8660 = rdev_get_drvdata(rdev);
5eb3394f	136	u8 reg, bits;
27f37e4b WS	137	int ret;
27f37e4b WS	138
27f37e4b WS	139	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	140	ret = max8660_write(max8660, reg, 0, selector);
	141	if (ret)
	142	return ret;
	143
	144	/* Select target voltage register and activate regulation */
	145	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	146	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
	147	}
	148
	149	static struct regulator_ops max8660_dcdc_ops = {
	150	.is_enabled = max8660_dcdc_is_enabled,
134d34a8	151	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	152	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	153	.set_voltage_sel = max8660_dcdc_set_voltage_sel,
9392c4f0	154	.get_voltage_sel = max8660_dcdc_get_voltage_sel,
27f37e4b WS	155	};
	156
	157
	158	/*
	159	* LDO5 functions
	160	*/
	161
9392c4f0	162	static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	163	{
27f37e4b WS	164	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b	165
9392c4f0 AL	166	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
9392c4f0 AL	167	return selector;
27f37e4b WS	168	}
27f37e4b WS	169
5eb3394f AL	170	static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	171	unsigned int selector)
27f37e4b WS	172	{
27f37e4b WS	173	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b WS	174	int ret;
27f37e4b WS	175
27f37e4b WS	176	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	177	if (ret)
	178	return ret;
	179
	180	/* Select target voltage register and activate regulation */
	181	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
	182	}
	183
8c2cd469	184	static const struct regulator_ops max8660_ldo5_ops = {
134d34a8	185	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	186	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	187	.set_voltage_sel = max8660_ldo5_set_voltage_sel,
9392c4f0	188	.get_voltage_sel = max8660_ldo5_get_voltage_sel,
27f37e4b WS	189	};
	190
	191
	192	/*
	193	* LDO67 functions
	194	*/
	195
	196	static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
	197	{
	198	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	199	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	200	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
f920ec79	201
27f37e4b WS	202	return !!(val & mask);
	203	}
	204
	205	static int max8660_ldo67_enable(struct regulator_dev *rdev)
	206	{
	207	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	208	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
f920ec79	209
27f37e4b WS	210	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
	211	}
	212
	213	static int max8660_ldo67_disable(struct regulator_dev *rdev)
	214	{
	215	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	216	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
f920ec79	217
27f37e4b WS	218	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
	219	}
	220
9392c4f0	221	static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	222	{
	223	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	224	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
	225	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
f920ec79	226
9392c4f0	227	return selector;
27f37e4b WS	228	}
27f37e4b WS	229
5eb3394f AL	230	static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	231	unsigned int selector)
27f37e4b WS	232	{
27f37e4b WS	233	struct max8660 *max8660 = rdev_get_drvdata(rdev);
3a93f2a9	234
27f37e4b WS	235	if (rdev_get_id(rdev) == MAX8660_V6)
	236	return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	237	else
5eb3394f AL	238	return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
5eb3394f AL	239	selector << 4);
27f37e4b WS	240	}
27f37e4b WS	241
8c2cd469	242	static const struct regulator_ops max8660_ldo67_ops = {
27f37e4b WS	243	.is_enabled = max8660_ldo67_is_enabled,
	244	.enable = max8660_ldo67_enable,
	245	.disable = max8660_ldo67_disable,
134d34a8	246	.list_voltage = regulator_list_voltage_linear,
5eb3394f	247	.map_voltage = regulator_map_voltage_linear,
9392c4f0	248	.get_voltage_sel = max8660_ldo67_get_voltage_sel,
5eb3394f	249	.set_voltage_sel = max8660_ldo67_set_voltage_sel,
27f37e4b WS	250	};
27f37e4b WS	251
621adb30	252	static const struct regulator_desc max8660_reg[] = {
27f37e4b WS	253	{
	254	.name = "V3(DCDC)",
	255	.id = MAX8660_V3,
	256	.ops = &max8660_dcdc_ops,
	257	.type = REGULATOR_VOLTAGE,
	258	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	259	.owner = THIS_MODULE,
134d34a8 AL	260	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	261	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	262	},
	263	{
	264	.name = "V4(DCDC)",
	265	.id = MAX8660_V4,
	266	.ops = &max8660_dcdc_ops,
	267	.type = REGULATOR_VOLTAGE,
	268	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	269	.owner = THIS_MODULE,
134d34a8 AL	270	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	271	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	272	},
	273	{
	274	.name = "V5(LDO)",
	275	.id = MAX8660_V5,
	276	.ops = &max8660_ldo5_ops,
	277	.type = REGULATOR_VOLTAGE,
	278	.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
	279	.owner = THIS_MODULE,
134d34a8 AL	280	.min_uV = MAX8660_LDO5_MIN_UV,
134d34a8 AL	281	.uV_step = MAX8660_LDO5_STEP,
27f37e4b WS	282	},
	283	{
	284	.name = "V6(LDO)",
	285	.id = MAX8660_V6,
	286	.ops = &max8660_ldo67_ops,
	287	.type = REGULATOR_VOLTAGE,
	288	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	289	.owner = THIS_MODULE,
134d34a8 AL	290	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	291	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	292	},
	293	{
	294	.name = "V7(LDO)",
	295	.id = MAX8660_V7,
	296	.ops = &max8660_ldo67_ops,
	297	.type = REGULATOR_VOLTAGE,
	298	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	299	.owner = THIS_MODULE,
134d34a8 AL	300	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	301	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	302	},
	303	};
	304
4a678f03 DM	305	enum {
	306	MAX8660 = 0,
	307	MAX8661 = 1,
	308	};
	309
abe4c51a DM	310	#ifdef CONFIG_OF
	311	static const struct of_device_id max8660_dt_ids[] = {
	312	{ .compatible = "maxim,max8660", .data = (void *) MAX8660 },
	313	{ .compatible = "maxim,max8661", .data = (void *) MAX8661 },
	314	{ }
	315	};
	316	MODULE_DEVICE_TABLE(of, max8660_dt_ids);
	317
	318	static int max8660_pdata_from_dt(struct device *dev,
	319	struct device_node **of_node,
	320	struct max8660_platform_data *pdata)
	321	{
	322	int matched, i;
	323	struct device_node *np;
	324	struct max8660_subdev_data *sub;
c9889803	325	struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { };
abe4c51a	326
826adb49	327	np = of_get_child_by_name(dev->of_node, "regulators");
abe4c51a DM	328	if (!np) {
	329	dev_err(dev, "missing 'regulators' subnode in DT\n");
	330	return -EINVAL;
	331	}
	332
	333	for (i = 0; i < ARRAY_SIZE(rmatch); i++)
	334	rmatch[i].name = max8660_reg[i].name;
	335
	336	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
cde248f9	337	of_node_put(np);
abe4c51a DM	338	if (matched <= 0)
	339	return matched;
	340
a86854d0 KC	341	pdata->subdevs = devm_kcalloc(dev,
	342	matched,
	343	sizeof(struct max8660_subdev_data),
	344	GFP_KERNEL);
abe4c51a DM	345	if (!pdata->subdevs)
	346	return -ENOMEM;
	347
	348	pdata->num_subdevs = matched;
	349	sub = pdata->subdevs;
	350
	351	for (i = 0; i < matched; i++) {
	352	sub->id = i;
	353	sub->name = rmatch[i].name;
	354	sub->platform_data = rmatch[i].init_data;
	355	of_node[i] = rmatch[i].of_node;
	356	sub++;
	357	}
	358
	359	return 0;
	360	}
	361	#else
	362	static inline int max8660_pdata_from_dt(struct device *dev,
	363	struct device_node **of_node,
d6c7e113	364	struct max8660_platform_data *pdata)
abe4c51a DM	365	{
	366	return 0;
	367	}
	368	#endif
	369
a5023574	370	static int max8660_probe(struct i2c_client *client,
308f100f	371	const struct i2c_device_id *i2c_id)
27f37e4b	372	{
de492e8d	373	struct device *dev = &client->dev;
dfb85ba1	374	struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
c172708d	375	struct regulator_config config = { };
27f37e4b WS	376	struct max8660 *max8660;
27f37e4b WS	377	int boot_on, i, id, ret = -EINVAL;
abe4c51a	378	struct device_node *of_node[MAX8660_V_END];
d6c7e113	379	unsigned long type;
27f37e4b	380
abe4c51a DM	381	if (dev->of_node && !pdata) {
abe4c51a DM	382	const struct of_device_id *id;
abe4c51a DM	383
	384	id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
	385	if (!id)
	386	return -ENODEV;
	387
	388	ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
	389	if (ret < 0)
	390	return ret;
	391
	392	pdata = &pdata_of;
d6c7e113	393	type = (unsigned long) id->data;
abe4c51a DM	394	} else {
	395	type = i2c_id->driver_data;
	396	memset(of_node, 0, sizeof(of_node));
	397	}
	398
27f37e4b	399	if (pdata->num_subdevs > MAX8660_V_END) {
de492e8d	400	dev_err(dev, "Too many regulators found!\n");
4d26f7d5	401	return -EINVAL;
27f37e4b WS	402	}
27f37e4b WS	403
67f76a93	404	max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
4d26f7d5 AL	405	if (!max8660)
4d26f7d5 AL	406	return -ENOMEM;
27f37e4b WS	407
27f37e4b WS	408	max8660->client = client;
27f37e4b WS	409
	410	if (pdata->en34_is_high) {
	411	/* Simulate always on */
	412	max8660->shadow_regs[MAX8660_OVER1] = 5;
	413	} else {
	414	/* Otherwise devices can be toggled via software */
	415	max8660_dcdc_ops.enable = max8660_dcdc_enable;
	416	max8660_dcdc_ops.disable = max8660_dcdc_disable;
	417	}
	418
	419	/*
	420	* First, set up shadow registers to prevent glitches. As some
	421	* registers are shared between regulators, everything must be properly
	422	* set up for all regulators in advance.
	423	*/
	424	max8660->shadow_regs[MAX8660_ADTV1] =
	425	max8660->shadow_regs[MAX8660_ADTV2] =
	426	max8660->shadow_regs[MAX8660_SDTV1] =
	427	max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	428	max8660->shadow_regs[MAX8660_MDTV1] =
	429	max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
	430
	431	for (i = 0; i < pdata->num_subdevs; i++) {
	432
	433	if (!pdata->subdevs[i].platform_data)
c0cf5a59 MP	434	boot_on = false;
	435	else
	436	boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
27f37e4b WS	437
	438	switch (pdata->subdevs[i].id) {
	439	case MAX8660_V3:
	440	if (boot_on)
	441	max8660->shadow_regs[MAX8660_OVER1] \|= 1;
	442	break;
	443
	444	case MAX8660_V4:
	445	if (boot_on)
	446	max8660->shadow_regs[MAX8660_OVER1] \|= 4;
	447	break;
	448
	449	case MAX8660_V5:
	450	break;
	451
	452	case MAX8660_V6:
	453	if (boot_on)
	454	max8660->shadow_regs[MAX8660_OVER2] \|= 2;
	455	break;
	456
	457	case MAX8660_V7:
4a678f03	458	if (type == MAX8661) {
de492e8d	459	dev_err(dev, "Regulator not on this chip!\n");
dcfb6b56	460	return -EINVAL;
27f37e4b WS	461	}
	462
	463	if (boot_on)
	464	max8660->shadow_regs[MAX8660_OVER2] \|= 4;
	465	break;
	466
	467	default:
de492e8d	468	dev_err(dev, "invalid regulator %s\n",
27f37e4b	469	pdata->subdevs[i].name);
dcfb6b56	470	return ret;
27f37e4b WS	471	}
	472	}
	473
	474	/* Finally register devices */
	475	for (i = 0; i < pdata->num_subdevs; i++) {
67f76a93	476	struct regulator_dev *rdev;
27f37e4b WS	477
	478	id = pdata->subdevs[i].id;
	479
de492e8d	480	config.dev = dev;
c172708d	481	config.init_data = pdata->subdevs[i].platform_data;
abe4c51a	482	config.of_node = of_node[i];
c172708d MB	483	config.driver_data = max8660;
c172708d MB	484
67f76a93	485	rdev = devm_regulator_register(&client->dev,
dcfb6b56	486	&max8660_reg[id], &config);
67f76a93	487	if (IS_ERR(rdev)) {
dcfb6b56	488	dev_err(&client->dev, "failed to register %s\n",
27f37e4b	489	max8660_reg[id].name);
67f76a93	490	return PTR_ERR(rdev);
27f37e4b WS	491	}
	492	}
	493
53a4befa	494	i2c_set_clientdata(client, max8660);
27f37e4b	495	return 0;
27f37e4b WS	496	}
	497
	498	static const struct i2c_device_id max8660_id[] = {
4a678f03 DM	499	{ .name = "max8660", .driver_data = MAX8660 },
4a678f03 DM	500	{ .name = "max8661", .driver_data = MAX8661 },
27f37e4b WS	501	{ }
	502	};
	503	MODULE_DEVICE_TABLE(i2c, max8660_id);
	504
	505	static struct i2c_driver max8660_driver = {
	506	.probe = max8660_probe,
27f37e4b WS	507	.driver = {
	508	.name = "max8660",
	509	},
	510	.id_table = max8660_id,
	511	};
	512
	513	static int __init max8660_init(void)
	514	{
	515	return i2c_add_driver(&max8660_driver);
	516	}
	517	subsys_initcall(max8660_init);
	518
	519	static void __exit max8660_exit(void)
	520	{
	521	i2c_del_driver(&max8660_driver);
	522	}
	523	module_exit(max8660_exit);
	524
	525	/* Module information */
	526	MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
	527	MODULE_AUTHOR("Wolfram Sang");
	528	MODULE_LICENSE("GPL v2");