[deliverable/linux.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 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 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 = 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;
		struct max8660_platform_data pdata_of;

		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)
			return ret;

		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",
		.owner	= THIS_MODULE,
	},
	.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	{
	88	static const u8 max8660_addresses[MAX8660_N_REGS] =
	89	{ 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 };
	90
	91	int ret;
	92	u8 reg_val = (max8660->shadow_regs[reg] & mask) \| val;
	93	dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
	94	max8660_addresses[reg], reg_val);
	95
	96	ret = i2c_smbus_write_byte_data(max8660->client,
	97	max8660_addresses[reg], reg_val);
	98	if (ret == 0)
	99	max8660->shadow_regs[reg] = reg_val;
	100
	101	return ret;
	102	}
	103
	104
	105	/*
	106	* DCDC functions
	107	*/
	108
	109	static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
	110	{
	111	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	112	u8 val = max8660->shadow_regs[MAX8660_OVER1];
	113	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
	114	return !!(val & mask);
	115	}
	116
	117	static int max8660_dcdc_enable(struct regulator_dev *rdev)
	118	{
	119	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	120	u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
	121	return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
	122	}
	123
	124	static int max8660_dcdc_disable(struct regulator_dev *rdev)
	125	{
	126	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	127	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
	128	return max8660_write(max8660, MAX8660_OVER1, mask, 0);
	129	}
	130
9392c4f0	131	static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	132	{
27f37e4b WS	133	struct max8660 *max8660 = rdev_get_drvdata(rdev);
9392c4f0	134
27f37e4b WS	135	u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
27f37e4b WS	136	u8 selector = max8660->shadow_regs[reg];
9392c4f0	137	return selector;
27f37e4b WS	138	}
27f37e4b WS	139
5eb3394f AL	140	static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	141	unsigned int selector)
27f37e4b WS	142	{
27f37e4b WS	143	struct max8660 *max8660 = rdev_get_drvdata(rdev);
5eb3394f	144	u8 reg, bits;
27f37e4b WS	145	int ret;
27f37e4b WS	146
27f37e4b WS	147	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	148	ret = max8660_write(max8660, reg, 0, selector);
	149	if (ret)
	150	return ret;
	151
	152	/* Select target voltage register and activate regulation */
	153	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	154	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
	155	}
	156
	157	static struct regulator_ops max8660_dcdc_ops = {
	158	.is_enabled = max8660_dcdc_is_enabled,
134d34a8	159	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	160	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	161	.set_voltage_sel = max8660_dcdc_set_voltage_sel,
9392c4f0	162	.get_voltage_sel = max8660_dcdc_get_voltage_sel,
27f37e4b WS	163	};
	164
	165
	166	/*
	167	* LDO5 functions
	168	*/
	169
9392c4f0	170	static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	171	{
27f37e4b WS	172	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b	173
9392c4f0 AL	174	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
9392c4f0 AL	175	return selector;
27f37e4b WS	176	}
27f37e4b WS	177
5eb3394f AL	178	static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	179	unsigned int selector)
27f37e4b WS	180	{
27f37e4b WS	181	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b WS	182	int ret;
27f37e4b WS	183
27f37e4b WS	184	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	185	if (ret)
	186	return ret;
	187
	188	/* Select target voltage register and activate regulation */
	189	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
	190	}
	191
	192	static struct regulator_ops max8660_ldo5_ops = {
134d34a8	193	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	194	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	195	.set_voltage_sel = max8660_ldo5_set_voltage_sel,
9392c4f0	196	.get_voltage_sel = max8660_ldo5_get_voltage_sel,
27f37e4b WS	197	};
	198
	199
	200	/*
	201	* LDO67 functions
	202	*/
	203
	204	static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
	205	{
	206	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	207	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	208	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	209	return !!(val & mask);
	210	}
	211
	212	static int max8660_ldo67_enable(struct regulator_dev *rdev)
	213	{
	214	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	215	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	216	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
	217	}
	218
	219	static int max8660_ldo67_disable(struct regulator_dev *rdev)
	220	{
	221	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	222	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
	223	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
	224	}
	225
9392c4f0	226	static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	227	{
27f37e4b WS	228	struct max8660 *max8660 = rdev_get_drvdata(rdev);
9392c4f0	229
27f37e4b WS	230	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
27f37e4b WS	231	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
9392c4f0	232	return selector;
27f37e4b WS	233	}
27f37e4b WS	234
5eb3394f AL	235	static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	236	unsigned int selector)
27f37e4b WS	237	{
27f37e4b WS	238	struct max8660 *max8660 = rdev_get_drvdata(rdev);
3a93f2a9	239
27f37e4b WS	240	if (rdev_get_id(rdev) == MAX8660_V6)
	241	return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	242	else
5eb3394f AL	243	return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
5eb3394f AL	244	selector << 4);
27f37e4b WS	245	}
	246
	247	static struct regulator_ops max8660_ldo67_ops = {
	248	.is_enabled = max8660_ldo67_is_enabled,
	249	.enable = max8660_ldo67_enable,
	250	.disable = max8660_ldo67_disable,
134d34a8	251	.list_voltage = regulator_list_voltage_linear,
5eb3394f	252	.map_voltage = regulator_map_voltage_linear,
9392c4f0	253	.get_voltage_sel = max8660_ldo67_get_voltage_sel,
5eb3394f	254	.set_voltage_sel = max8660_ldo67_set_voltage_sel,
27f37e4b WS	255	};
27f37e4b WS	256
621adb30	257	static const struct regulator_desc max8660_reg[] = {
27f37e4b WS	258	{
	259	.name = "V3(DCDC)",
	260	.id = MAX8660_V3,
	261	.ops = &max8660_dcdc_ops,
	262	.type = REGULATOR_VOLTAGE,
	263	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	264	.owner = THIS_MODULE,
134d34a8 AL	265	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	266	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	267	},
	268	{
	269	.name = "V4(DCDC)",
	270	.id = MAX8660_V4,
	271	.ops = &max8660_dcdc_ops,
	272	.type = REGULATOR_VOLTAGE,
	273	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	274	.owner = THIS_MODULE,
134d34a8 AL	275	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	276	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	277	},
	278	{
	279	.name = "V5(LDO)",
	280	.id = MAX8660_V5,
	281	.ops = &max8660_ldo5_ops,
	282	.type = REGULATOR_VOLTAGE,
	283	.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
	284	.owner = THIS_MODULE,
134d34a8 AL	285	.min_uV = MAX8660_LDO5_MIN_UV,
134d34a8 AL	286	.uV_step = MAX8660_LDO5_STEP,
27f37e4b WS	287	},
	288	{
	289	.name = "V6(LDO)",
	290	.id = MAX8660_V6,
	291	.ops = &max8660_ldo67_ops,
	292	.type = REGULATOR_VOLTAGE,
	293	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	294	.owner = THIS_MODULE,
134d34a8 AL	295	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	296	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	297	},
	298	{
	299	.name = "V7(LDO)",
	300	.id = MAX8660_V7,
	301	.ops = &max8660_ldo67_ops,
	302	.type = REGULATOR_VOLTAGE,
	303	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	304	.owner = THIS_MODULE,
134d34a8 AL	305	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	306	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	307	},
	308	};
	309
4a678f03 DM	310	enum {
	311	MAX8660 = 0,
	312	MAX8661 = 1,
	313	};
	314
abe4c51a DM	315	#ifdef CONFIG_OF
	316	static const struct of_device_id max8660_dt_ids[] = {
	317	{ .compatible = "maxim,max8660", .data = (void *) MAX8660 },
	318	{ .compatible = "maxim,max8661", .data = (void *) MAX8661 },
	319	{ }
	320	};
	321	MODULE_DEVICE_TABLE(of, max8660_dt_ids);
	322
	323	static int max8660_pdata_from_dt(struct device *dev,
	324	struct device_node **of_node,
	325	struct max8660_platform_data *pdata)
	326	{
	327	int matched, i;
	328	struct device_node *np;
	329	struct max8660_subdev_data *sub;
	330	struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)];
	331
826adb49	332	np = of_get_child_by_name(dev->of_node, "regulators");
abe4c51a DM	333	if (!np) {
	334	dev_err(dev, "missing 'regulators' subnode in DT\n");
	335	return -EINVAL;
	336	}
	337
	338	for (i = 0; i < ARRAY_SIZE(rmatch); i++)
	339	rmatch[i].name = max8660_reg[i].name;
	340
	341	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
cde248f9	342	of_node_put(np);
abe4c51a DM	343	if (matched <= 0)
	344	return matched;
	345
	346	pdata->subdevs = devm_kzalloc(dev, sizeof(struct max8660_subdev_data) *
	347	matched, GFP_KERNEL);
	348	if (!pdata->subdevs)
	349	return -ENOMEM;
	350
	351	pdata->num_subdevs = matched;
	352	sub = pdata->subdevs;
	353
	354	for (i = 0; i < matched; i++) {
	355	sub->id = i;
	356	sub->name = rmatch[i].name;
	357	sub->platform_data = rmatch[i].init_data;
	358	of_node[i] = rmatch[i].of_node;
	359	sub++;
	360	}
	361
	362	return 0;
	363	}
	364	#else
	365	static inline int max8660_pdata_from_dt(struct device *dev,
	366	struct device_node **of_node,
d6c7e113	367	struct max8660_platform_data *pdata)
abe4c51a DM	368	{
	369	return 0;
	370	}
	371	#endif
	372
a5023574	373	static int max8660_probe(struct i2c_client *client,
308f100f	374	const struct i2c_device_id *i2c_id)
27f37e4b	375	{
de492e8d DM	376	struct device *dev = &client->dev;
de492e8d DM	377	struct max8660_platform_data *pdata = dev_get_platdata(dev);
c172708d	378	struct regulator_config config = { };
27f37e4b WS	379	struct max8660 *max8660;
27f37e4b WS	380	int boot_on, i, id, ret = -EINVAL;
abe4c51a	381	struct device_node *of_node[MAX8660_V_END];
d6c7e113	382	unsigned long type;
27f37e4b	383
abe4c51a DM	384	if (dev->of_node && !pdata) {
	385	const struct of_device_id *id;
	386	struct max8660_platform_data pdata_of;
	387
	388	id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
	389	if (!id)
	390	return -ENODEV;
	391
	392	ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
	393	if (ret < 0)
	394	return ret;
	395
	396	pdata = &pdata_of;
d6c7e113	397	type = (unsigned long) id->data;
abe4c51a DM	398	} else {
	399	type = i2c_id->driver_data;
	400	memset(of_node, 0, sizeof(of_node));
	401	}
	402
27f37e4b	403	if (pdata->num_subdevs > MAX8660_V_END) {
de492e8d	404	dev_err(dev, "Too many regulators found!\n");
4d26f7d5	405	return -EINVAL;
27f37e4b WS	406	}
27f37e4b WS	407
67f76a93	408	max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
4d26f7d5 AL	409	if (!max8660)
4d26f7d5 AL	410	return -ENOMEM;
27f37e4b WS	411
27f37e4b WS	412	max8660->client = client;
27f37e4b WS	413
	414	if (pdata->en34_is_high) {
	415	/* Simulate always on */
	416	max8660->shadow_regs[MAX8660_OVER1] = 5;
	417	} else {
	418	/* Otherwise devices can be toggled via software */
	419	max8660_dcdc_ops.enable = max8660_dcdc_enable;
	420	max8660_dcdc_ops.disable = max8660_dcdc_disable;
	421	}
	422
	423	/*
	424	* First, set up shadow registers to prevent glitches. As some
	425	* registers are shared between regulators, everything must be properly
	426	* set up for all regulators in advance.
	427	*/
	428	max8660->shadow_regs[MAX8660_ADTV1] =
	429	max8660->shadow_regs[MAX8660_ADTV2] =
	430	max8660->shadow_regs[MAX8660_SDTV1] =
	431	max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	432	max8660->shadow_regs[MAX8660_MDTV1] =
	433	max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
	434
	435	for (i = 0; i < pdata->num_subdevs; i++) {
	436
	437	if (!pdata->subdevs[i].platform_data)
dcfb6b56	438	return ret;
27f37e4b WS	439
	440	boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
	441
	442	switch (pdata->subdevs[i].id) {
	443	case MAX8660_V3:
	444	if (boot_on)
	445	max8660->shadow_regs[MAX8660_OVER1] \|= 1;
	446	break;
	447
	448	case MAX8660_V4:
	449	if (boot_on)
	450	max8660->shadow_regs[MAX8660_OVER1] \|= 4;
	451	break;
	452
	453	case MAX8660_V5:
	454	break;
	455
	456	case MAX8660_V6:
	457	if (boot_on)
	458	max8660->shadow_regs[MAX8660_OVER2] \|= 2;
	459	break;
	460
	461	case MAX8660_V7:
4a678f03	462	if (type == MAX8661) {
de492e8d	463	dev_err(dev, "Regulator not on this chip!\n");
dcfb6b56	464	return -EINVAL;
27f37e4b WS	465	}
	466
	467	if (boot_on)
	468	max8660->shadow_regs[MAX8660_OVER2] \|= 4;
	469	break;
	470
	471	default:
de492e8d	472	dev_err(dev, "invalid regulator %s\n",
27f37e4b	473	pdata->subdevs[i].name);
dcfb6b56	474	return ret;
27f37e4b WS	475	}
	476	}
	477
	478	/* Finally register devices */
	479	for (i = 0; i < pdata->num_subdevs; i++) {
67f76a93	480	struct regulator_dev *rdev;
27f37e4b WS	481
	482	id = pdata->subdevs[i].id;
	483
de492e8d	484	config.dev = dev;
c172708d	485	config.init_data = pdata->subdevs[i].platform_data;
abe4c51a	486	config.of_node = of_node[i];
c172708d MB	487	config.driver_data = max8660;
c172708d MB	488
67f76a93	489	rdev = devm_regulator_register(&client->dev,
dcfb6b56	490	&max8660_reg[id], &config);
67f76a93 KK	491	if (IS_ERR(rdev)) {
67f76a93 KK	492	ret = PTR_ERR(rdev);
dcfb6b56	493	dev_err(&client->dev, "failed to register %s\n",
27f37e4b	494	max8660_reg[id].name);
67f76a93	495	return PTR_ERR(rdev);
27f37e4b WS	496	}
	497	}
	498
53a4befa	499	i2c_set_clientdata(client, max8660);
27f37e4b	500	return 0;
27f37e4b WS	501	}
	502
	503	static const struct i2c_device_id max8660_id[] = {
4a678f03 DM	504	{ .name = "max8660", .driver_data = MAX8660 },
4a678f03 DM	505	{ .name = "max8661", .driver_data = MAX8661 },
27f37e4b WS	506	{ }
	507	};
	508	MODULE_DEVICE_TABLE(i2c, max8660_id);
	509
	510	static struct i2c_driver max8660_driver = {
	511	.probe = max8660_probe,
27f37e4b WS	512	.driver = {
27f37e4b WS	513	.name = "max8660",
308f100f	514	.owner = THIS_MODULE,
27f37e4b WS	515	},
	516	.id_table = max8660_id,
	517	};
	518
	519	static int __init max8660_init(void)
	520	{
	521	return i2c_add_driver(&max8660_driver);
	522	}
	523	subsys_initcall(max8660_init);
	524
	525	static void __exit max8660_exit(void)
	526	{
	527	i2c_del_driver(&max8660_driver);
	528	}
	529	module_exit(max8660_exit);
	530
	531	/* Module information */
	532	MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
	533	MODULE_AUTHOR("Wolfram Sang");
	534	MODULE_LICENSE("GPL v2");