[linux-2.6-block.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 */
	struct regulator_dev *rdev[];
};

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_find_node_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));
	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 regulator_dev **rdev;
	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 int 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 int) 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) +
			sizeof(struct regulator_dev *) * MAX8660_V_END,
			GFP_KERNEL);
	if (!max8660)
		return -ENOMEM;

	max8660->client = client;
	rdev = max8660->rdev;

	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)
			goto err_out;

		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");
				goto err_out;
			}

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

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

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

		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[i] = regulator_register(&max8660_reg[id], &config);
		if (IS_ERR(rdev[i])) {
			ret = PTR_ERR(rdev[i]);
			dev_err(dev, "failed to register %s\n",
				max8660_reg[id].name);
			goto err_unregister;
		}
	}

	i2c_set_clientdata(client, max8660);
	return 0;

err_unregister:
	while (--i >= 0)
		regulator_unregister(rdev[i]);
err_out:
	return ret;
}

static int max8660_remove(struct i2c_client *client)
{
	struct max8660 *max8660 = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < MAX8660_V_END; i++)
		regulator_unregister(max8660->rdev[i]);
	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,
	.remove = max8660_remove,
	.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 */
	84	struct regulator_dev *rdev[];
	85	};
	86
	87	static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
	88	{
	89	static const u8 max8660_addresses[MAX8660_N_REGS] =
	90	{ 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 };
	91
	92	int ret;
	93	u8 reg_val = (max8660->shadow_regs[reg] & mask) \| val;
	94	dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
	95	max8660_addresses[reg], reg_val);
	96
	97	ret = i2c_smbus_write_byte_data(max8660->client,
	98	max8660_addresses[reg], reg_val);
	99	if (ret == 0)
	100	max8660->shadow_regs[reg] = reg_val;
	101
	102	return ret;
	103	}
	104
	105
	106	/*
	107	* DCDC functions
	108	*/
	109
	110	static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
	111	{
	112	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	113	u8 val = max8660->shadow_regs[MAX8660_OVER1];
114	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
115	return !!(val & mask);
116	}
117
118	static int max8660_dcdc_enable(struct regulator_dev *rdev)
119	{
120	struct max8660 *max8660 = rdev_get_drvdata(rdev);
121	u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
122	return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
123	}
124
125	static int max8660_dcdc_disable(struct regulator_dev *rdev)
126	{
127	struct max8660 *max8660 = rdev_get_drvdata(rdev);
128	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
129	return max8660_write(max8660, MAX8660_OVER1, mask, 0);
130	}
131
9392c4f0	132	static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	133	{
27f37e4b WS	134	struct max8660 *max8660 = rdev_get_drvdata(rdev);
9392c4f0	135
27f37e4b WS	136	u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
27f37e4b WS	137	u8 selector = max8660->shadow_regs[reg];
9392c4f0	138	return selector;
27f37e4b WS	139	}
27f37e4b WS	140
5eb3394f AL	141	static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	142	unsigned int selector)
27f37e4b WS	143	{
27f37e4b WS	144	struct max8660 *max8660 = rdev_get_drvdata(rdev);
5eb3394f	145	u8 reg, bits;
27f37e4b WS	146	int ret;
27f37e4b WS	147
27f37e4b WS	148	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	149	ret = max8660_write(max8660, reg, 0, selector);
	150	if (ret)
	151	return ret;
	152
	153	/* Select target voltage register and activate regulation */
	154	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	155	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
	156	}
	157
	158	static struct regulator_ops max8660_dcdc_ops = {
	159	.is_enabled = max8660_dcdc_is_enabled,
134d34a8	160	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	161	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	162	.set_voltage_sel = max8660_dcdc_set_voltage_sel,
9392c4f0	163	.get_voltage_sel = max8660_dcdc_get_voltage_sel,
27f37e4b WS	164	};
	165
	166
	167	/*
	168	* LDO5 functions
	169	*/
	170
9392c4f0	171	static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	172	{
27f37e4b WS	173	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b	174
9392c4f0 AL	175	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
9392c4f0 AL	176	return selector;
27f37e4b WS	177	}
27f37e4b WS	178
5eb3394f AL	179	static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	180	unsigned int selector)
27f37e4b WS	181	{
27f37e4b WS	182	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b WS	183	int ret;
27f37e4b WS	184
27f37e4b WS	185	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	186	if (ret)
	187	return ret;
	188
	189	/* Select target voltage register and activate regulation */
	190	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
	191	}
	192
	193	static struct regulator_ops max8660_ldo5_ops = {
134d34a8	194	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	195	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	196	.set_voltage_sel = max8660_ldo5_set_voltage_sel,
9392c4f0	197	.get_voltage_sel = max8660_ldo5_get_voltage_sel,
27f37e4b WS	198	};
	199
	200
	201	/*
	202	* LDO67 functions
	203	*/
	204
	205	static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
	206	{
	207	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	208	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	209	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	210	return !!(val & mask);
	211	}
	212
	213	static int max8660_ldo67_enable(struct regulator_dev *rdev)
	214	{
	215	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	216	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	217	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
	218	}
	219
	220	static int max8660_ldo67_disable(struct regulator_dev *rdev)
	221	{
	222	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	223	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
	224	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
	225	}
	226
9392c4f0	227	static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	228	{
27f37e4b WS	229	struct max8660 *max8660 = rdev_get_drvdata(rdev);
9392c4f0	230
27f37e4b WS	231	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
27f37e4b WS	232	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
9392c4f0	233	return selector;
27f37e4b WS	234	}
27f37e4b WS	235
5eb3394f AL	236	static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	237	unsigned int selector)
27f37e4b WS	238	{
27f37e4b WS	239	struct max8660 *max8660 = rdev_get_drvdata(rdev);
3a93f2a9	240
27f37e4b WS	241	if (rdev_get_id(rdev) == MAX8660_V6)
	242	return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	243	else
5eb3394f AL	244	return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
5eb3394f AL	245	selector << 4);
27f37e4b WS	246	}
	247
	248	static struct regulator_ops max8660_ldo67_ops = {
	249	.is_enabled = max8660_ldo67_is_enabled,
	250	.enable = max8660_ldo67_enable,
	251	.disable = max8660_ldo67_disable,
134d34a8	252	.list_voltage = regulator_list_voltage_linear,
5eb3394f	253	.map_voltage = regulator_map_voltage_linear,
9392c4f0	254	.get_voltage_sel = max8660_ldo67_get_voltage_sel,
5eb3394f	255	.set_voltage_sel = max8660_ldo67_set_voltage_sel,
27f37e4b WS	256	};
27f37e4b WS	257
621adb30	258	static const struct regulator_desc max8660_reg[] = {
27f37e4b WS	259	{
	260	.name = "V3(DCDC)",
	261	.id = MAX8660_V3,
	262	.ops = &max8660_dcdc_ops,
	263	.type = REGULATOR_VOLTAGE,
	264	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	265	.owner = THIS_MODULE,
134d34a8 AL	266	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	267	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	268	},
	269	{
	270	.name = "V4(DCDC)",
	271	.id = MAX8660_V4,
	272	.ops = &max8660_dcdc_ops,
	273	.type = REGULATOR_VOLTAGE,
	274	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	275	.owner = THIS_MODULE,
134d34a8 AL	276	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	277	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	278	},
	279	{
	280	.name = "V5(LDO)",
	281	.id = MAX8660_V5,
	282	.ops = &max8660_ldo5_ops,
	283	.type = REGULATOR_VOLTAGE,
	284	.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
	285	.owner = THIS_MODULE,
134d34a8 AL	286	.min_uV = MAX8660_LDO5_MIN_UV,
134d34a8 AL	287	.uV_step = MAX8660_LDO5_STEP,
27f37e4b WS	288	},
	289	{
	290	.name = "V6(LDO)",
	291	.id = MAX8660_V6,
	292	.ops = &max8660_ldo67_ops,
	293	.type = REGULATOR_VOLTAGE,
	294	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	295	.owner = THIS_MODULE,
134d34a8 AL	296	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	297	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	298	},
	299	{
	300	.name = "V7(LDO)",
	301	.id = MAX8660_V7,
	302	.ops = &max8660_ldo67_ops,
	303	.type = REGULATOR_VOLTAGE,
	304	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	305	.owner = THIS_MODULE,
134d34a8 AL	306	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	307	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	308	},
	309	};
	310
4a678f03 DM	311	enum {
	312	MAX8660 = 0,
	313	MAX8661 = 1,
	314	};
	315
abe4c51a DM	316	#ifdef CONFIG_OF
	317	static const struct of_device_id max8660_dt_ids[] = {
	318	{ .compatible = "maxim,max8660", .data = (void *) MAX8660 },
	319	{ .compatible = "maxim,max8661", .data = (void *) MAX8661 },
	320	{ }
	321	};
	322	MODULE_DEVICE_TABLE(of, max8660_dt_ids);
	323
	324	static int max8660_pdata_from_dt(struct device *dev,
	325	struct device_node **of_node,
	326	struct max8660_platform_data *pdata)
	327	{
	328	int matched, i;
	329	struct device_node *np;
	330	struct max8660_subdev_data *sub;
	331	struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)];
	332
	333	np = of_find_node_by_name(dev->of_node, "regulators");
	334	if (!np) {
	335	dev_err(dev, "missing 'regulators' subnode in DT\n");
	336	return -EINVAL;
	337	}
	338
	339	for (i = 0; i < ARRAY_SIZE(rmatch); i++)
	340	rmatch[i].name = max8660_reg[i].name;
	341
	342	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
	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,
	367	struct max8660_platform_data **pdata)
	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 WS	375	{
27f37e4b WS	376	struct regulator_dev **rdev;
de492e8d DM	377	struct device *dev = &client->dev;
de492e8d DM	378	struct max8660_platform_data *pdata = dev_get_platdata(dev);
c172708d	379	struct regulator_config config = { };
27f37e4b WS	380	struct max8660 *max8660;
27f37e4b WS	381	int boot_on, i, id, ret = -EINVAL;
abe4c51a	382	struct device_node *of_node[MAX8660_V_END];
4a678f03	383	unsigned int type;
27f37e4b	384
abe4c51a DM	385	if (dev->of_node && !pdata) {
	386	const struct of_device_id *id;
	387	struct max8660_platform_data pdata_of;
	388
	389	id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
	390	if (!id)
	391	return -ENODEV;
	392
	393	ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
	394	if (ret < 0)
	395	return ret;
	396
	397	pdata = &pdata_of;
	398	type = (unsigned int) id->data;
	399	} else {
	400	type = i2c_id->driver_data;
	401	memset(of_node, 0, sizeof(of_node));
	402	}
	403
27f37e4b	404	if (pdata->num_subdevs > MAX8660_V_END) {
de492e8d	405	dev_err(dev, "Too many regulators found!\n");
4d26f7d5	406	return -EINVAL;
27f37e4b WS	407	}
27f37e4b WS	408
de492e8d	409	max8660 = devm_kzalloc(dev, sizeof(struct max8660) +
27f37e4b WS	410	sizeof(struct regulator_dev ) MAX8660_V_END,
27f37e4b WS	411	GFP_KERNEL);
4d26f7d5 AL	412	if (!max8660)
4d26f7d5 AL	413	return -ENOMEM;
27f37e4b WS	414
	415	max8660->client = client;
	416	rdev = max8660->rdev;
	417
	418	if (pdata->en34_is_high) {
	419	/* Simulate always on */
	420	max8660->shadow_regs[MAX8660_OVER1] = 5;
	421	} else {
	422	/* Otherwise devices can be toggled via software */
	423	max8660_dcdc_ops.enable = max8660_dcdc_enable;
	424	max8660_dcdc_ops.disable = max8660_dcdc_disable;
	425	}
	426
	427	/*
	428	* First, set up shadow registers to prevent glitches. As some
	429	* registers are shared between regulators, everything must be properly
	430	* set up for all regulators in advance.
	431	*/
	432	max8660->shadow_regs[MAX8660_ADTV1] =
	433	max8660->shadow_regs[MAX8660_ADTV2] =
	434	max8660->shadow_regs[MAX8660_SDTV1] =
	435	max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	436	max8660->shadow_regs[MAX8660_MDTV1] =
	437	max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
	438
	439	for (i = 0; i < pdata->num_subdevs; i++) {
	440
	441	if (!pdata->subdevs[i].platform_data)
4d26f7d5	442	goto err_out;
27f37e4b WS	443
	444	boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
	445
	446	switch (pdata->subdevs[i].id) {
	447	case MAX8660_V3:
	448	if (boot_on)
	449	max8660->shadow_regs[MAX8660_OVER1] \|= 1;
	450	break;
	451
	452	case MAX8660_V4:
	453	if (boot_on)
	454	max8660->shadow_regs[MAX8660_OVER1] \|= 4;
	455	break;
	456
	457	case MAX8660_V5:
	458	break;
	459
	460	case MAX8660_V6:
	461	if (boot_on)
	462	max8660->shadow_regs[MAX8660_OVER2] \|= 2;
	463	break;
	464
	465	case MAX8660_V7:
4a678f03	466	if (type == MAX8661) {
de492e8d	467	dev_err(dev, "Regulator not on this chip!\n");
4d26f7d5	468	goto err_out;
27f37e4b WS	469	}
	470
	471	if (boot_on)
	472	max8660->shadow_regs[MAX8660_OVER2] \|= 4;
	473	break;
	474
	475	default:
de492e8d	476	dev_err(dev, "invalid regulator %s\n",
27f37e4b	477	pdata->subdevs[i].name);
4d26f7d5	478	goto err_out;
27f37e4b WS	479	}
	480	}
	481
	482	/* Finally register devices */
	483	for (i = 0; i < pdata->num_subdevs; i++) {
	484
	485	id = pdata->subdevs[i].id;
	486
de492e8d	487	config.dev = dev;
c172708d	488	config.init_data = pdata->subdevs[i].platform_data;
abe4c51a	489	config.of_node = of_node[i];
c172708d MB	490	config.driver_data = max8660;
	491
	492	rdev[i] = regulator_register(&max8660_reg[id], &config);
27f37e4b WS	493	if (IS_ERR(rdev[i])) {
27f37e4b WS	494	ret = PTR_ERR(rdev[i]);
de492e8d	495	dev_err(dev, "failed to register %s\n",
27f37e4b WS	496	max8660_reg[id].name);
	497	goto err_unregister;
	498	}
	499	}
	500
53a4befa	501	i2c_set_clientdata(client, max8660);
27f37e4b WS	502	return 0;
	503
	504	err_unregister:
	505	while (--i >= 0)
	506	regulator_unregister(rdev[i]);
4d26f7d5	507	err_out:
27f37e4b WS	508	return ret;
	509	}
	510
8dc995f5	511	static int max8660_remove(struct i2c_client *client)
27f37e4b	512	{
53a4befa	513	struct max8660 *max8660 = i2c_get_clientdata(client);
27f37e4b WS	514	int i;
	515
	516	for (i = 0; i < MAX8660_V_END; i++)
020501f1	517	regulator_unregister(max8660->rdev[i]);
27f37e4b WS	518	return 0;
	519	}
	520
	521	static const struct i2c_device_id max8660_id[] = {
4a678f03 DM	522	{ .name = "max8660", .driver_data = MAX8660 },
4a678f03 DM	523	{ .name = "max8661", .driver_data = MAX8661 },
27f37e4b WS	524	{ }
	525	};
	526	MODULE_DEVICE_TABLE(i2c, max8660_id);
	527
	528	static struct i2c_driver max8660_driver = {
	529	.probe = max8660_probe,
5eb9f2b9	530	.remove = max8660_remove,
27f37e4b WS	531	.driver = {
27f37e4b WS	532	.name = "max8660",
308f100f	533	.owner = THIS_MODULE,
27f37e4b WS	534	},
	535	.id_table = max8660_id,
	536	};
	537
	538	static int __init max8660_init(void)
	539	{
	540	return i2c_add_driver(&max8660_driver);
	541	}
	542	subsys_initcall(max8660_init);
	543
	544	static void __exit max8660_exit(void)
	545	{
	546	i2c_del_driver(&max8660_driver);
	547	}
	548	module_exit(max8660_exit);
	549
	550	/* Module information */
	551	MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
	552	MODULE_AUTHOR("Wolfram Sang");
	553	MODULE_LICENSE("GPL v2");