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

/*
 * 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.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * 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_kzalloc(dev, sizeof(struct max8660_subdev_data) *
						matched, 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)) {
			ret = PTR_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
27f37e4b WS	1	/*
	2	* max8660.c -- Voltage regulation for the Maxim 8660/8661
	3	*
	4	* based on max1586.c and wm8400-regulator.c
	5	*
	6	* Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	15	* more details.
	16	*
	17	* You should have received a copy of the GNU General Public License along with
	18	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	19	* Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* Some info:
	22	*
	23	* Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
	24	*
	25	* This chip is a bit nasty because it is a write-only device. Thus, the driver
	26	* uses shadow registers to keep track of its values. The main problem appears
	27	* to be the initialization: When Linux boots up, we cannot know if the chip is
	28	* in the default state or not, so we would have to pass such information in
	29	* platform_data. As this adds a bit of complexity to the driver, this is left
	30	* out for now until it is really needed.
	31	*
	32	* [A\|S\|M]DTV1 registers are currently not used, but [A\|S\|M]DTV2.
	33	*
	34	* If the driver is feature complete, it might be worth to check if one set of
	35	* functions for V3-V7 is sufficient. For maximum flexibility during
	36	* development, they are separated for now.
	37	*
	38	*/
	39
	40	#include <linux/module.h>
	41	#include <linux/err.h>
	42	#include <linux/i2c.h>
	43	#include <linux/platform_device.h>
	44	#include <linux/regulator/driver.h>
5a0e3ad6	45	#include <linux/slab.h>
27f37e4b	46	#include <linux/regulator/max8660.h>
abe4c51a DM	47	#include <linux/of.h>
	48	#include <linux/of_device.h>
	49	#include <linux/regulator/of_regulator.h>
27f37e4b WS	50
	51	#define MAX8660_DCDC_MIN_UV 725000
	52	#define MAX8660_DCDC_MAX_UV 1800000
	53	#define MAX8660_DCDC_STEP 25000
	54	#define MAX8660_DCDC_MAX_SEL 0x2b
	55
	56	#define MAX8660_LDO5_MIN_UV 1700000
	57	#define MAX8660_LDO5_MAX_UV 2000000
	58	#define MAX8660_LDO5_STEP 25000
	59	#define MAX8660_LDO5_MAX_SEL 0x0c
	60
	61	#define MAX8660_LDO67_MIN_UV 1800000
	62	#define MAX8660_LDO67_MAX_UV 3300000
	63	#define MAX8660_LDO67_STEP 100000
	64	#define MAX8660_LDO67_MAX_SEL 0x0f
	65
	66	enum {
	67	MAX8660_OVER1,
	68	MAX8660_OVER2,
	69	MAX8660_VCC1,
	70	MAX8660_ADTV1,
	71	MAX8660_ADTV2,
	72	MAX8660_SDTV1,
	73	MAX8660_SDTV2,
	74	MAX8660_MDTV1,
	75	MAX8660_MDTV2,
	76	MAX8660_L12VCR,
	77	MAX8660_FPWM,
	78	MAX8660_N_REGS, /* not a real register */
	79	};
	80
	81	struct max8660 {
	82	struct i2c_client *client;
	83	u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
27f37e4b WS	84	};
	85
	86	static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
	87	{
f920ec79	88	static const u8 max8660_addresses[MAX8660_N_REGS] = {
dda5e36b SK	89	0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80
dda5e36b SK	90	};
27f37e4b WS	91
	92	int ret;
	93	u8 reg_val = (max8660->shadow_regs[reg] & mask) \| val;
f920ec79	94
27f37e4b WS	95	dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
	96	max8660_addresses[reg], reg_val);
	97
	98	ret = i2c_smbus_write_byte_data(max8660->client,
	99	max8660_addresses[reg], reg_val);
	100	if (ret == 0)
	101	max8660->shadow_regs[reg] = reg_val;
	102
	103	return ret;
	104	}
	105
	106
	107	/*
	108	* DCDC functions
	109	*/
	110
	111	static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
	112	{
	113	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	114	u8 val = max8660->shadow_regs[MAX8660_OVER1];
	115	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
f920ec79	116
27f37e4b WS	117	return !!(val & mask);
	118	}
	119
	120	static int max8660_dcdc_enable(struct regulator_dev *rdev)
	121	{
	122	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	123	u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
f920ec79	124
27f37e4b WS	125	return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
	126	}
	127
	128	static int max8660_dcdc_disable(struct regulator_dev *rdev)
	129	{
	130	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	131	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
f920ec79	132
27f37e4b WS	133	return max8660_write(max8660, MAX8660_OVER1, mask, 0);
	134	}
	135
9392c4f0	136	static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	137	{
	138	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	139	u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	140	u8 selector = max8660->shadow_regs[reg];
f920ec79	141
9392c4f0	142	return selector;
27f37e4b WS	143	}
27f37e4b WS	144
5eb3394f AL	145	static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	146	unsigned int selector)
27f37e4b WS	147	{
27f37e4b WS	148	struct max8660 *max8660 = rdev_get_drvdata(rdev);
5eb3394f	149	u8 reg, bits;
27f37e4b WS	150	int ret;
27f37e4b WS	151
27f37e4b WS	152	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	153	ret = max8660_write(max8660, reg, 0, selector);
	154	if (ret)
	155	return ret;
	156
	157	/* Select target voltage register and activate regulation */
	158	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	159	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
	160	}
	161
	162	static struct regulator_ops max8660_dcdc_ops = {
	163	.is_enabled = max8660_dcdc_is_enabled,
134d34a8	164	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	165	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	166	.set_voltage_sel = max8660_dcdc_set_voltage_sel,
9392c4f0	167	.get_voltage_sel = max8660_dcdc_get_voltage_sel,
27f37e4b WS	168	};
	169
	170
	171	/*
	172	* LDO5 functions
	173	*/
	174
9392c4f0	175	static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	176	{
27f37e4b WS	177	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b	178
9392c4f0 AL	179	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
9392c4f0 AL	180	return selector;
27f37e4b WS	181	}
27f37e4b WS	182
5eb3394f AL	183	static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	184	unsigned int selector)
27f37e4b WS	185	{
27f37e4b WS	186	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b WS	187	int ret;
27f37e4b WS	188
27f37e4b WS	189	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	190	if (ret)
	191	return ret;
	192
	193	/* Select target voltage register and activate regulation */
	194	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
	195	}
	196
8c2cd469	197	static const struct regulator_ops max8660_ldo5_ops = {
134d34a8	198	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	199	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	200	.set_voltage_sel = max8660_ldo5_set_voltage_sel,
9392c4f0	201	.get_voltage_sel = max8660_ldo5_get_voltage_sel,
27f37e4b WS	202	};
	203
	204
	205	/*
	206	* LDO67 functions
	207	*/
	208
	209	static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
	210	{
	211	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	212	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	213	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
f920ec79	214
27f37e4b WS	215	return !!(val & mask);
	216	}
	217
	218	static int max8660_ldo67_enable(struct regulator_dev *rdev)
	219	{
	220	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	221	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
f920ec79	222
27f37e4b WS	223	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
	224	}
	225
	226	static int max8660_ldo67_disable(struct regulator_dev *rdev)
	227	{
	228	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	229	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
f920ec79	230
27f37e4b WS	231	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
	232	}
	233
9392c4f0	234	static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	235	{
	236	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	237	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
	238	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
f920ec79	239
9392c4f0	240	return selector;
27f37e4b WS	241	}
27f37e4b WS	242
5eb3394f AL	243	static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	244	unsigned int selector)
27f37e4b WS	245	{
27f37e4b WS	246	struct max8660 *max8660 = rdev_get_drvdata(rdev);
3a93f2a9	247
27f37e4b WS	248	if (rdev_get_id(rdev) == MAX8660_V6)
	249	return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	250	else
5eb3394f AL	251	return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
5eb3394f AL	252	selector << 4);
27f37e4b WS	253	}
27f37e4b WS	254
8c2cd469	255	static const struct regulator_ops max8660_ldo67_ops = {
27f37e4b WS	256	.is_enabled = max8660_ldo67_is_enabled,
	257	.enable = max8660_ldo67_enable,
	258	.disable = max8660_ldo67_disable,
134d34a8	259	.list_voltage = regulator_list_voltage_linear,
5eb3394f	260	.map_voltage = regulator_map_voltage_linear,
9392c4f0	261	.get_voltage_sel = max8660_ldo67_get_voltage_sel,
5eb3394f	262	.set_voltage_sel = max8660_ldo67_set_voltage_sel,
27f37e4b WS	263	};
27f37e4b WS	264
621adb30	265	static const struct regulator_desc max8660_reg[] = {
27f37e4b WS	266	{
	267	.name = "V3(DCDC)",
	268	.id = MAX8660_V3,
	269	.ops = &max8660_dcdc_ops,
	270	.type = REGULATOR_VOLTAGE,
	271	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	272	.owner = THIS_MODULE,
134d34a8 AL	273	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	274	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	275	},
	276	{
	277	.name = "V4(DCDC)",
	278	.id = MAX8660_V4,
	279	.ops = &max8660_dcdc_ops,
	280	.type = REGULATOR_VOLTAGE,
	281	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	282	.owner = THIS_MODULE,
134d34a8 AL	283	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	284	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	285	},
	286	{
	287	.name = "V5(LDO)",
	288	.id = MAX8660_V5,
	289	.ops = &max8660_ldo5_ops,
	290	.type = REGULATOR_VOLTAGE,
	291	.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
	292	.owner = THIS_MODULE,
134d34a8 AL	293	.min_uV = MAX8660_LDO5_MIN_UV,
134d34a8 AL	294	.uV_step = MAX8660_LDO5_STEP,
27f37e4b WS	295	},
	296	{
	297	.name = "V6(LDO)",
	298	.id = MAX8660_V6,
	299	.ops = &max8660_ldo67_ops,
	300	.type = REGULATOR_VOLTAGE,
	301	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	302	.owner = THIS_MODULE,
134d34a8 AL	303	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	304	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	305	},
	306	{
	307	.name = "V7(LDO)",
	308	.id = MAX8660_V7,
	309	.ops = &max8660_ldo67_ops,
	310	.type = REGULATOR_VOLTAGE,
	311	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	312	.owner = THIS_MODULE,
134d34a8 AL	313	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	314	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	315	},
	316	};
	317
4a678f03 DM	318	enum {
	319	MAX8660 = 0,
	320	MAX8661 = 1,
	321	};
	322
abe4c51a DM	323	#ifdef CONFIG_OF
	324	static const struct of_device_id max8660_dt_ids[] = {
	325	{ .compatible = "maxim,max8660", .data = (void *) MAX8660 },
	326	{ .compatible = "maxim,max8661", .data = (void *) MAX8661 },
	327	{ }
	328	};
	329	MODULE_DEVICE_TABLE(of, max8660_dt_ids);
	330
	331	static int max8660_pdata_from_dt(struct device *dev,
	332	struct device_node **of_node,
	333	struct max8660_platform_data *pdata)
	334	{
	335	int matched, i;
	336	struct device_node *np;
	337	struct max8660_subdev_data *sub;
c9889803	338	struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { };
abe4c51a	339
826adb49	340	np = of_get_child_by_name(dev->of_node, "regulators");
abe4c51a DM	341	if (!np) {
	342	dev_err(dev, "missing 'regulators' subnode in DT\n");
	343	return -EINVAL;
	344	}
	345
	346	for (i = 0; i < ARRAY_SIZE(rmatch); i++)
	347	rmatch[i].name = max8660_reg[i].name;
	348
	349	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
cde248f9	350	of_node_put(np);
abe4c51a DM	351	if (matched <= 0)
	352	return matched;
	353
	354	pdata->subdevs = devm_kzalloc(dev, sizeof(struct max8660_subdev_data) *
	355	matched, GFP_KERNEL);
	356	if (!pdata->subdevs)
	357	return -ENOMEM;
	358
	359	pdata->num_subdevs = matched;
	360	sub = pdata->subdevs;
	361
	362	for (i = 0; i < matched; i++) {
	363	sub->id = i;
	364	sub->name = rmatch[i].name;
	365	sub->platform_data = rmatch[i].init_data;
	366	of_node[i] = rmatch[i].of_node;
	367	sub++;
	368	}
	369
	370	return 0;
	371	}
	372	#else
	373	static inline int max8660_pdata_from_dt(struct device *dev,
	374	struct device_node **of_node,
d6c7e113	375	struct max8660_platform_data *pdata)
abe4c51a DM	376	{
	377	return 0;
	378	}
	379	#endif
	380
a5023574	381	static int max8660_probe(struct i2c_client *client,
308f100f	382	const struct i2c_device_id *i2c_id)
27f37e4b	383	{
de492e8d	384	struct device *dev = &client->dev;
dfb85ba1	385	struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
c172708d	386	struct regulator_config config = { };
27f37e4b WS	387	struct max8660 *max8660;
27f37e4b WS	388	int boot_on, i, id, ret = -EINVAL;
abe4c51a	389	struct device_node *of_node[MAX8660_V_END];
d6c7e113	390	unsigned long type;
27f37e4b	391
abe4c51a DM	392	if (dev->of_node && !pdata) {
abe4c51a DM	393	const struct of_device_id *id;
abe4c51a DM	394
	395	id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
	396	if (!id)
	397	return -ENODEV;
	398
	399	ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
	400	if (ret < 0)
	401	return ret;
	402
	403	pdata = &pdata_of;
d6c7e113	404	type = (unsigned long) id->data;
abe4c51a DM	405	} else {
	406	type = i2c_id->driver_data;
	407	memset(of_node, 0, sizeof(of_node));
	408	}
	409
27f37e4b	410	if (pdata->num_subdevs > MAX8660_V_END) {
de492e8d	411	dev_err(dev, "Too many regulators found!\n");
4d26f7d5	412	return -EINVAL;
27f37e4b WS	413	}
27f37e4b WS	414
67f76a93	415	max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
4d26f7d5 AL	416	if (!max8660)
4d26f7d5 AL	417	return -ENOMEM;
27f37e4b WS	418
27f37e4b WS	419	max8660->client = client;
27f37e4b WS	420
	421	if (pdata->en34_is_high) {
	422	/* Simulate always on */
	423	max8660->shadow_regs[MAX8660_OVER1] = 5;
	424	} else {
	425	/* Otherwise devices can be toggled via software */
	426	max8660_dcdc_ops.enable = max8660_dcdc_enable;
	427	max8660_dcdc_ops.disable = max8660_dcdc_disable;
	428	}
	429
	430	/*
	431	* First, set up shadow registers to prevent glitches. As some
	432	* registers are shared between regulators, everything must be properly
	433	* set up for all regulators in advance.
	434	*/
	435	max8660->shadow_regs[MAX8660_ADTV1] =
	436	max8660->shadow_regs[MAX8660_ADTV2] =
	437	max8660->shadow_regs[MAX8660_SDTV1] =
	438	max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	439	max8660->shadow_regs[MAX8660_MDTV1] =
	440	max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
	441
	442	for (i = 0; i < pdata->num_subdevs; i++) {
	443
	444	if (!pdata->subdevs[i].platform_data)
c0cf5a59 MP	445	boot_on = false;
	446	else
	447	boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
27f37e4b WS	448
	449	switch (pdata->subdevs[i].id) {
	450	case MAX8660_V3:
	451	if (boot_on)
	452	max8660->shadow_regs[MAX8660_OVER1] \|= 1;
	453	break;
	454
	455	case MAX8660_V4:
	456	if (boot_on)
	457	max8660->shadow_regs[MAX8660_OVER1] \|= 4;
	458	break;
	459
	460	case MAX8660_V5:
	461	break;
	462
	463	case MAX8660_V6:
	464	if (boot_on)
	465	max8660->shadow_regs[MAX8660_OVER2] \|= 2;
	466	break;
	467
	468	case MAX8660_V7:
4a678f03	469	if (type == MAX8661) {
de492e8d	470	dev_err(dev, "Regulator not on this chip!\n");
dcfb6b56	471	return -EINVAL;
27f37e4b WS	472	}
	473
	474	if (boot_on)
	475	max8660->shadow_regs[MAX8660_OVER2] \|= 4;
	476	break;
	477
	478	default:
de492e8d	479	dev_err(dev, "invalid regulator %s\n",
27f37e4b	480	pdata->subdevs[i].name);
dcfb6b56	481	return ret;
27f37e4b WS	482	}
	483	}
	484
	485	/* Finally register devices */
	486	for (i = 0; i < pdata->num_subdevs; i++) {
67f76a93	487	struct regulator_dev *rdev;
27f37e4b WS	488
	489	id = pdata->subdevs[i].id;
	490
de492e8d	491	config.dev = dev;
c172708d	492	config.init_data = pdata->subdevs[i].platform_data;
abe4c51a	493	config.of_node = of_node[i];
c172708d MB	494	config.driver_data = max8660;
c172708d MB	495
67f76a93	496	rdev = devm_regulator_register(&client->dev,
dcfb6b56	497	&max8660_reg[id], &config);
67f76a93 KK	498	if (IS_ERR(rdev)) {
67f76a93 KK	499	ret = PTR_ERR(rdev);
dcfb6b56	500	dev_err(&client->dev, "failed to register %s\n",
27f37e4b	501	max8660_reg[id].name);
67f76a93	502	return PTR_ERR(rdev);
27f37e4b WS	503	}
	504	}
	505
53a4befa	506	i2c_set_clientdata(client, max8660);
27f37e4b	507	return 0;
27f37e4b WS	508	}
	509
	510	static const struct i2c_device_id max8660_id[] = {
4a678f03 DM	511	{ .name = "max8660", .driver_data = MAX8660 },
4a678f03 DM	512	{ .name = "max8661", .driver_data = MAX8661 },
27f37e4b WS	513	{ }
	514	};
	515	MODULE_DEVICE_TABLE(i2c, max8660_id);
	516
	517	static struct i2c_driver max8660_driver = {
	518	.probe = max8660_probe,
27f37e4b WS	519	.driver = {
	520	.name = "max8660",
	521	},
	522	.id_table = max8660_id,
	523	};
	524
	525	static int __init max8660_init(void)
	526	{
	527	return i2c_add_driver(&max8660_driver);
	528	}
	529	subsys_initcall(max8660_init);
	530
	531	static void __exit max8660_exit(void)
	532	{
	533	i2c_del_driver(&max8660_driver);
	534	}
	535	module_exit(max8660_exit);
	536
	537	/* Module information */
	538	MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
	539	MODULE_AUTHOR("Wolfram Sang");
	540	MODULE_LICENSE("GPL v2");