[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>

#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_list(struct regulator_dev *rdev, unsigned selector)
{
	if (selector > MAX8660_DCDC_MAX_SEL)
		return -EINVAL;
	return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
}

static int max8660_dcdc_get(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 MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
}

static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV,
			    unsigned int *s)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 reg, selector, bits;
	int ret;

	if (min_uV < MAX8660_DCDC_MIN_UV || min_uV > MAX8660_DCDC_MAX_UV)
		return -EINVAL;
	if (max_uV < MAX8660_DCDC_MIN_UV || max_uV > MAX8660_DCDC_MAX_UV)
		return -EINVAL;

	selector = DIV_ROUND_UP(min_uV - MAX8660_DCDC_MIN_UV,
				MAX8660_DCDC_STEP);

	ret = max8660_dcdc_list(rdev, selector);
	if (ret < 0 || ret > max_uV)
		return -EINVAL;

	*s = selector;

	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 = max8660_dcdc_list,
	.set_voltage = max8660_dcdc_set,
	.get_voltage = max8660_dcdc_get,
};


/*
 * LDO5 functions
 */

static int max8660_ldo5_list(struct regulator_dev *rdev, unsigned selector)
{
	if (selector > MAX8660_LDO5_MAX_SEL)
		return -EINVAL;
	return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
}

static int max8660_ldo5_get(struct regulator_dev *rdev)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];

	return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
}

static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV,
			    unsigned int *s)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 selector;
	int ret;

	if (min_uV < MAX8660_LDO5_MIN_UV || min_uV > MAX8660_LDO5_MAX_UV)
		return -EINVAL;
	if (max_uV < MAX8660_LDO5_MIN_UV || max_uV > MAX8660_LDO5_MAX_UV)
		return -EINVAL;

	selector = DIV_ROUND_UP(min_uV - MAX8660_LDO5_MIN_UV,
				MAX8660_LDO5_STEP);

	ret = max8660_ldo5_list(rdev, selector);
	if (ret < 0 || ret > max_uV)
		return -EINVAL;

	*s = selector;

	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 = max8660_ldo5_list,
	.set_voltage = max8660_ldo5_set,
	.get_voltage = max8660_ldo5_get,
};


/*
 * 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_list(struct regulator_dev *rdev, unsigned selector)
{
	if (selector > MAX8660_LDO67_MAX_SEL)
		return -EINVAL;
	return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
}

static int max8660_ldo67_get(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 MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
}

static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV,
			     int max_uV, unsigned int *s)
{
	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	u8 selector;
	int ret;

	if (min_uV < MAX8660_LDO67_MIN_UV || min_uV > MAX8660_LDO67_MAX_UV)
		return -EINVAL;
	if (max_uV < MAX8660_LDO67_MIN_UV || max_uV > MAX8660_LDO67_MAX_UV)
		return -EINVAL;

	selector = DIV_ROUND_UP(min_uV - MAX8660_LDO67_MIN_UV,
				MAX8660_LDO67_STEP);

	ret = max8660_ldo67_list(rdev, selector);
	if (ret < 0 || ret > max_uV)
		return -EINVAL;

	*s = selector;

	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 = max8660_ldo67_list,
	.get_voltage = max8660_ldo67_get,
	.set_voltage = max8660_ldo67_set,
};

static 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,
	},
	{
		.name = "V4(DCDC)",
		.id = MAX8660_V4,
		.ops = &max8660_dcdc_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
		.owner = THIS_MODULE,
	},
	{
		.name = "V5(LDO)",
		.id = MAX8660_V5,
		.ops = &max8660_ldo5_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
		.owner = THIS_MODULE,
	},
	{
		.name = "V6(LDO)",
		.id = MAX8660_V6,
		.ops = &max8660_ldo67_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
		.owner = THIS_MODULE,
	},
	{
		.name = "V7(LDO)",
		.id = MAX8660_V7,
		.ops = &max8660_ldo67_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
		.owner = THIS_MODULE,
	},
};

static int __devinit max8660_probe(struct i2c_client *client,
				   const struct i2c_device_id *i2c_id)
{
	struct regulator_dev **rdev;
	struct max8660_platform_data *pdata = client->dev.platform_data;
	struct max8660 *max8660;
	int boot_on, i, id, ret = -EINVAL;

	if (pdata->num_subdevs > MAX8660_V_END) {
		dev_err(&client->dev, "Too many regulators found!\n");
		goto out;
	}

	max8660 = kzalloc(sizeof(struct max8660) +
			sizeof(struct regulator_dev *) * MAX8660_V_END,
			GFP_KERNEL);
	if (!max8660) {
		ret = -ENOMEM;
		goto out;
	}

	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_free;

		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 (!strcmp(i2c_id->name, "max8661")) {
				dev_err(&client->dev, "Regulator not on this chip!\n");
				goto err_free;
			}

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

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

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

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

		rdev[i] = regulator_register(&max8660_reg[id], &client->dev,
					     pdata->subdevs[i].platform_data,
					     max8660, NULL);
		if (IS_ERR(rdev[i])) {
			ret = PTR_ERR(rdev[i]);
			dev_err(&client->dev, "failed to register %s\n",
				max8660_reg[id].name);
			goto err_unregister;
		}
	}

	i2c_set_clientdata(client, max8660);
	dev_info(&client->dev, "Maxim 8660/8661 regulator driver loaded\n");
	return 0;

err_unregister:
	while (--i >= 0)
		regulator_unregister(rdev[i]);
err_free:
	kfree(max8660);
out:
	return ret;
}

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

	for (i = 0; i < MAX8660_V_END; i++)
		if (max8660->rdev[i])
			regulator_unregister(max8660->rdev[i]);
	kfree(max8660);

	return 0;
}

static const struct i2c_device_id max8660_id[] = {
	{ "max8660", 0 },
	{ "max8661", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max8660_id);

static struct i2c_driver max8660_driver = {
	.probe = max8660_probe,
	.remove = __devexit_p(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 WS	46	#include <linux/regulator/max8660.h>
	47
	48	#define MAX8660_DCDC_MIN_UV 725000
	49	#define MAX8660_DCDC_MAX_UV 1800000
	50	#define MAX8660_DCDC_STEP 25000
	51	#define MAX8660_DCDC_MAX_SEL 0x2b
	52
	53	#define MAX8660_LDO5_MIN_UV 1700000
	54	#define MAX8660_LDO5_MAX_UV 2000000
	55	#define MAX8660_LDO5_STEP 25000
	56	#define MAX8660_LDO5_MAX_SEL 0x0c
	57
	58	#define MAX8660_LDO67_MIN_UV 1800000
	59	#define MAX8660_LDO67_MAX_UV 3300000
	60	#define MAX8660_LDO67_STEP 100000
	61	#define MAX8660_LDO67_MAX_SEL 0x0f
	62
	63	enum {
	64	MAX8660_OVER1,
	65	MAX8660_OVER2,
	66	MAX8660_VCC1,
	67	MAX8660_ADTV1,
	68	MAX8660_ADTV2,
	69	MAX8660_SDTV1,
	70	MAX8660_SDTV2,
	71	MAX8660_MDTV1,
	72	MAX8660_MDTV2,
	73	MAX8660_L12VCR,
	74	MAX8660_FPWM,
	75	MAX8660_N_REGS, /* not a real register */
	76	};
	77
	78	struct max8660 {
	79	struct i2c_client *client;
	80	u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
	81	struct regulator_dev *rdev[];
	82	};
	83
	84	static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
	85	{
	86	static const u8 max8660_addresses[MAX8660_N_REGS] =
	87	{ 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 };
	88
	89	int ret;
	90	u8 reg_val = (max8660->shadow_regs[reg] & mask) \| val;
	91	dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
	92	max8660_addresses[reg], reg_val);
	93
	94	ret = i2c_smbus_write_byte_data(max8660->client,
	95	max8660_addresses[reg], reg_val);
	96	if (ret == 0)
	97	max8660->shadow_regs[reg] = reg_val;
	98
	99	return ret;
	100	}
	101
	102
	103	/*
	104	* DCDC functions
	105	*/
	106
	107	static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
	108	{
	109	struct max8660 *max8660 = rdev_get_drvdata(rdev);
110	u8 val = max8660->shadow_regs[MAX8660_OVER1];
111	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
112	return !!(val & mask);
113	}
114
115	static int max8660_dcdc_enable(struct regulator_dev *rdev)
116	{
117	struct max8660 *max8660 = rdev_get_drvdata(rdev);
118	u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
119	return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
120	}
121
122	static int max8660_dcdc_disable(struct regulator_dev *rdev)
123	{
124	struct max8660 *max8660 = rdev_get_drvdata(rdev);
125	u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
126	return max8660_write(max8660, MAX8660_OVER1, mask, 0);
127	}
128
129	static int max8660_dcdc_list(struct regulator_dev *rdev, unsigned selector)
130	{
131	if (selector > MAX8660_DCDC_MAX_SEL)
132	return -EINVAL;
133	return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
134	}
135
136	static int max8660_dcdc_get(struct regulator_dev *rdev)
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];
141	return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
142	}
143
3a93f2a9 MB	144	static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV,
3a93f2a9 MB	145	unsigned int *s)
27f37e4b WS	146	{
	147	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	148	u8 reg, selector, bits;
	149	int ret;
	150
	151	if (min_uV < MAX8660_DCDC_MIN_UV \|\| min_uV > MAX8660_DCDC_MAX_UV)
	152	return -EINVAL;
	153	if (max_uV < MAX8660_DCDC_MIN_UV \|\| max_uV > MAX8660_DCDC_MAX_UV)
	154	return -EINVAL;
	155
ab353c23 AL	156	selector = DIV_ROUND_UP(min_uV - MAX8660_DCDC_MIN_UV,
ab353c23 AL	157	MAX8660_DCDC_STEP);
27f37e4b WS	158
	159	ret = max8660_dcdc_list(rdev, selector);
	160	if (ret < 0 \|\| ret > max_uV)
	161	return -EINVAL;
	162
ab353c23 AL	163	*s = selector;
ab353c23 AL	164
27f37e4b WS	165	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	166	ret = max8660_write(max8660, reg, 0, selector);
	167	if (ret)
	168	return ret;
	169
	170	/* Select target voltage register and activate regulation */
	171	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	172	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
	173	}
	174
	175	static struct regulator_ops max8660_dcdc_ops = {
	176	.is_enabled = max8660_dcdc_is_enabled,
	177	.list_voltage = max8660_dcdc_list,
	178	.set_voltage = max8660_dcdc_set,
	179	.get_voltage = max8660_dcdc_get,
	180	};
	181
	182
	183	/*
	184	* LDO5 functions
	185	*/
	186
	187	static int max8660_ldo5_list(struct regulator_dev *rdev, unsigned selector)
	188	{
	189	if (selector > MAX8660_LDO5_MAX_SEL)
	190	return -EINVAL;
	191	return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
	192	}
	193
	194	static int max8660_ldo5_get(struct regulator_dev *rdev)
	195	{
	196	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	197	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
	198
	199	return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
	200	}
	201
3a93f2a9 MB	202	static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV,
3a93f2a9 MB	203	unsigned int *s)
27f37e4b WS	204	{
	205	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	206	u8 selector;
	207	int ret;
	208
	209	if (min_uV < MAX8660_LDO5_MIN_UV \|\| min_uV > MAX8660_LDO5_MAX_UV)
	210	return -EINVAL;
	211	if (max_uV < MAX8660_LDO5_MIN_UV \|\| max_uV > MAX8660_LDO5_MAX_UV)
	212	return -EINVAL;
	213
ab353c23 AL	214	selector = DIV_ROUND_UP(min_uV - MAX8660_LDO5_MIN_UV,
	215	MAX8660_LDO5_STEP);
	216
27f37e4b WS	217	ret = max8660_ldo5_list(rdev, selector);
	218	if (ret < 0 \|\| ret > max_uV)
	219	return -EINVAL;
	220
3a93f2a9 MB	221	*s = selector;
3a93f2a9 MB	222
27f37e4b WS	223	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	224	if (ret)
	225	return ret;
	226
	227	/* Select target voltage register and activate regulation */
	228	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
	229	}
	230
	231	static struct regulator_ops max8660_ldo5_ops = {
	232	.list_voltage = max8660_ldo5_list,
	233	.set_voltage = max8660_ldo5_set,
	234	.get_voltage = max8660_ldo5_get,
	235	};
	236
	237
	238	/*
	239	* LDO67 functions
	240	*/
	241
	242	static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
	243	{
	244	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	245	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	246	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	247	return !!(val & mask);
	248	}
	249
	250	static int max8660_ldo67_enable(struct regulator_dev *rdev)
	251	{
	252	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	253	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	254	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
	255	}
	256
	257	static int max8660_ldo67_disable(struct regulator_dev *rdev)
	258	{
	259	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	260	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
	261	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
	262	}
	263
	264	static int max8660_ldo67_list(struct regulator_dev *rdev, unsigned selector)
	265	{
	266	if (selector > MAX8660_LDO67_MAX_SEL)
	267	return -EINVAL;
	268	return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
	269	}
	270
	271	static int max8660_ldo67_get(struct regulator_dev *rdev)
	272	{
	273	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	274	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
	275	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
	276
	277	return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
	278	}
	279
3a93f2a9 MB	280	static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV,
3a93f2a9 MB	281	int max_uV, unsigned int *s)
27f37e4b WS	282	{
	283	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	284	u8 selector;
	285	int ret;
	286
	287	if (min_uV < MAX8660_LDO67_MIN_UV \|\| min_uV > MAX8660_LDO67_MAX_UV)
	288	return -EINVAL;
	289	if (max_uV < MAX8660_LDO67_MIN_UV \|\| max_uV > MAX8660_LDO67_MAX_UV)
	290	return -EINVAL;
	291
ab353c23 AL	292	selector = DIV_ROUND_UP(min_uV - MAX8660_LDO67_MIN_UV,
ab353c23 AL	293	MAX8660_LDO67_STEP);
27f37e4b WS	294
	295	ret = max8660_ldo67_list(rdev, selector);
	296	if (ret < 0 \|\| ret > max_uV)
	297	return -EINVAL;
	298
3a93f2a9 MB	299	*s = selector;
3a93f2a9 MB	300
27f37e4b WS	301	if (rdev_get_id(rdev) == MAX8660_V6)
	302	return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	303	else
	304	return max8660_write(max8660, MAX8660_L12VCR, 0x0f, selector << 4);
	305	}
	306
	307	static struct regulator_ops max8660_ldo67_ops = {
	308	.is_enabled = max8660_ldo67_is_enabled,
	309	.enable = max8660_ldo67_enable,
	310	.disable = max8660_ldo67_disable,
	311	.list_voltage = max8660_ldo67_list,
	312	.get_voltage = max8660_ldo67_get,
	313	.set_voltage = max8660_ldo67_set,
	314	};
	315
	316	static struct regulator_desc max8660_reg[] = {
	317	{
	318	.name = "V3(DCDC)",
	319	.id = MAX8660_V3,
	320	.ops = &max8660_dcdc_ops,
	321	.type = REGULATOR_VOLTAGE,
	322	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	323	.owner = THIS_MODULE,
	324	},
	325	{
	326	.name = "V4(DCDC)",
	327	.id = MAX8660_V4,
	328	.ops = &max8660_dcdc_ops,
	329	.type = REGULATOR_VOLTAGE,
	330	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	331	.owner = THIS_MODULE,
	332	},
	333	{
	334	.name = "V5(LDO)",
	335	.id = MAX8660_V5,
	336	.ops = &max8660_ldo5_ops,
	337	.type = REGULATOR_VOLTAGE,
	338	.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
	339	.owner = THIS_MODULE,
	340	},
	341	{
	342	.name = "V6(LDO)",
	343	.id = MAX8660_V6,
	344	.ops = &max8660_ldo67_ops,
	345	.type = REGULATOR_VOLTAGE,
	346	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	347	.owner = THIS_MODULE,
	348	},
	349	{
	350	.name = "V7(LDO)",
	351	.id = MAX8660_V7,
	352	.ops = &max8660_ldo67_ops,
	353	.type = REGULATOR_VOLTAGE,
	354	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	355	.owner = THIS_MODULE,
	356	},
	357	};
	358
308f100f DT	359	static int __devinit max8660_probe(struct i2c_client *client,
308f100f DT	360	const struct i2c_device_id *i2c_id)
27f37e4b WS	361	{
	362	struct regulator_dev **rdev;
	363	struct max8660_platform_data *pdata = client->dev.platform_data;
	364	struct max8660 *max8660;
	365	int boot_on, i, id, ret = -EINVAL;
	366
	367	if (pdata->num_subdevs > MAX8660_V_END) {
308f100f	368	dev_err(&client->dev, "Too many regulators found!\n");
27f37e4b WS	369	goto out;
	370	}
	371
	372	max8660 = kzalloc(sizeof(struct max8660) +
	373	sizeof(struct regulator_dev ) MAX8660_V_END,
	374	GFP_KERNEL);
	375	if (!max8660) {
	376	ret = -ENOMEM;
	377	goto out;
	378	}
	379
	380	max8660->client = client;
	381	rdev = max8660->rdev;
	382
	383	if (pdata->en34_is_high) {
	384	/* Simulate always on */
	385	max8660->shadow_regs[MAX8660_OVER1] = 5;
	386	} else {
	387	/* Otherwise devices can be toggled via software */
	388	max8660_dcdc_ops.enable = max8660_dcdc_enable;
	389	max8660_dcdc_ops.disable = max8660_dcdc_disable;
	390	}
	391
	392	/*
	393	* First, set up shadow registers to prevent glitches. As some
	394	* registers are shared between regulators, everything must be properly
	395	* set up for all regulators in advance.
	396	*/
	397	max8660->shadow_regs[MAX8660_ADTV1] =
	398	max8660->shadow_regs[MAX8660_ADTV2] =
	399	max8660->shadow_regs[MAX8660_SDTV1] =
	400	max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	401	max8660->shadow_regs[MAX8660_MDTV1] =
	402	max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
	403
	404	for (i = 0; i < pdata->num_subdevs; i++) {
	405
	406	if (!pdata->subdevs[i].platform_data)
	407	goto err_free;
	408
	409	boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
	410
	411	switch (pdata->subdevs[i].id) {
	412	case MAX8660_V3:
	413	if (boot_on)
	414	max8660->shadow_regs[MAX8660_OVER1] \|= 1;
	415	break;
	416
	417	case MAX8660_V4:
	418	if (boot_on)
	419	max8660->shadow_regs[MAX8660_OVER1] \|= 4;
	420	break;
	421
	422	case MAX8660_V5:
	423	break;
	424
	425	case MAX8660_V6:
	426	if (boot_on)
	427	max8660->shadow_regs[MAX8660_OVER2] \|= 2;
	428	break;
	429
	430	case MAX8660_V7:
	431	if (!strcmp(i2c_id->name, "max8661")) {
	432	dev_err(&client->dev, "Regulator not on this chip!\n");
433	goto err_free;
434	}
435
436	if (boot_on)
437	max8660->shadow_regs[MAX8660_OVER2] \|= 4;
438	break;
439
440	default:
441	dev_err(&client->dev, "invalid regulator %s\n",
442	pdata->subdevs[i].name);
443	goto err_free;
444	}
445	}
446
447	/* Finally register devices */
448	for (i = 0; i < pdata->num_subdevs; i++) {
449
450	id = pdata->subdevs[i].id;
451
452	rdev[i] = regulator_register(&max8660_reg[id], &client->dev,
453	pdata->subdevs[i].platform_data,
2c043bcb	454	max8660, NULL);
27f37e4b WS	455	if (IS_ERR(rdev[i])) {
	456	ret = PTR_ERR(rdev[i]);
	457	dev_err(&client->dev, "failed to register %s\n",
	458	max8660_reg[id].name);
	459	goto err_unregister;
	460	}
	461	}
	462
53a4befa	463	i2c_set_clientdata(client, max8660);
27f37e4b WS	464	dev_info(&client->dev, "Maxim 8660/8661 regulator driver loaded\n");
	465	return 0;
	466
	467	err_unregister:
	468	while (--i >= 0)
	469	regulator_unregister(rdev[i]);
	470	err_free:
	471	kfree(max8660);
	472	out:
	473	return ret;
	474	}
	475
308f100f	476	static int __devexit max8660_remove(struct i2c_client *client)
27f37e4b	477	{
53a4befa	478	struct max8660 *max8660 = i2c_get_clientdata(client);
27f37e4b WS	479	int i;
	480
	481	for (i = 0; i < MAX8660_V_END; i++)
53a4befa AL	482	if (max8660->rdev[i])
	483	regulator_unregister(max8660->rdev[i]);
	484	kfree(max8660);
27f37e4b WS	485
	486	return 0;
	487	}
	488
	489	static const struct i2c_device_id max8660_id[] = {
	490	{ "max8660", 0 },
	491	{ "max8661", 0 },
	492	{ }
	493	};
	494	MODULE_DEVICE_TABLE(i2c, max8660_id);
	495
	496	static struct i2c_driver max8660_driver = {
	497	.probe = max8660_probe,
308f100f	498	.remove = __devexit_p(max8660_remove),
27f37e4b WS	499	.driver = {
27f37e4b WS	500	.name = "max8660",
308f100f	501	.owner = THIS_MODULE,
27f37e4b WS	502	},
	503	.id_table = max8660_id,
	504	};
	505
	506	static int __init max8660_init(void)
	507	{
	508	return i2c_add_driver(&max8660_driver);
	509	}
	510	subsys_initcall(max8660_init);
	511
	512	static void __exit max8660_exit(void)
	513	{
	514	i2c_del_driver(&max8660_driver);
	515	}
	516	module_exit(max8660_exit);
	517
	518	/* Module information */
	519	MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
	520	MODULE_AUTHOR("Wolfram Sang");
	521	MODULE_LICENSE("GPL v2");