[GitHub/mt8127/android_kernel_alcatel_ttab.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_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,
	},
};

static int 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 regulator_config config = { };
	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");
		return -EINVAL;
	}

	max8660 = devm_kzalloc(&client->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 (!strcmp(i2c_id->name, "max8661")) {
				dev_err(&client->dev, "Regulator not on this chip!\n");
				goto err_out;
			}

			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_out;
		}
	}

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

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

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

		rdev[i] = regulator_register(&max8660_reg[id], &config);
		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);
	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[] = {
	{ "max8660", 0 },
	{ "max8661", 0 },
	{ }
};
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 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
9392c4f0	129	static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	130	{
27f37e4b WS	131	struct max8660 *max8660 = rdev_get_drvdata(rdev);
9392c4f0	132
27f37e4b WS	133	u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
27f37e4b WS	134	u8 selector = max8660->shadow_regs[reg];
9392c4f0	135	return selector;
27f37e4b WS	136	}
27f37e4b WS	137
5eb3394f AL	138	static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	139	unsigned int selector)
27f37e4b WS	140	{
27f37e4b WS	141	struct max8660 *max8660 = rdev_get_drvdata(rdev);
5eb3394f	142	u8 reg, bits;
27f37e4b WS	143	int ret;
27f37e4b WS	144
27f37e4b WS	145	reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
	146	ret = max8660_write(max8660, reg, 0, selector);
	147	if (ret)
	148	return ret;
	149
	150	/* Select target voltage register and activate regulation */
	151	bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
	152	return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
	153	}
	154
	155	static struct regulator_ops max8660_dcdc_ops = {
	156	.is_enabled = max8660_dcdc_is_enabled,
134d34a8	157	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	158	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	159	.set_voltage_sel = max8660_dcdc_set_voltage_sel,
9392c4f0	160	.get_voltage_sel = max8660_dcdc_get_voltage_sel,
27f37e4b WS	161	};
	162
	163
	164	/*
	165	* LDO5 functions
	166	*/
	167
9392c4f0	168	static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	169	{
27f37e4b WS	170	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b	171
9392c4f0 AL	172	u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
9392c4f0 AL	173	return selector;
27f37e4b WS	174	}
27f37e4b WS	175
5eb3394f AL	176	static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	177	unsigned int selector)
27f37e4b WS	178	{
27f37e4b WS	179	struct max8660 *max8660 = rdev_get_drvdata(rdev);
27f37e4b WS	180	int ret;
27f37e4b WS	181
27f37e4b WS	182	ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
	183	if (ret)
	184	return ret;
	185
	186	/* Select target voltage register and activate regulation */
	187	return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
	188	}
	189
	190	static struct regulator_ops max8660_ldo5_ops = {
134d34a8	191	.list_voltage = regulator_list_voltage_linear,
5eb3394f AL	192	.map_voltage = regulator_map_voltage_linear,
5eb3394f AL	193	.set_voltage_sel = max8660_ldo5_set_voltage_sel,
9392c4f0	194	.get_voltage_sel = max8660_ldo5_get_voltage_sel,
27f37e4b WS	195	};
	196
	197
	198	/*
	199	* LDO67 functions
	200	*/
	201
	202	static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
	203	{
	204	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	205	u8 val = max8660->shadow_regs[MAX8660_OVER2];
	206	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	207	return !!(val & mask);
	208	}
	209
	210	static int max8660_ldo67_enable(struct regulator_dev *rdev)
	211	{
	212	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	213	u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
	214	return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
	215	}
	216
	217	static int max8660_ldo67_disable(struct regulator_dev *rdev)
	218	{
	219	struct max8660 *max8660 = rdev_get_drvdata(rdev);
	220	u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
	221	return max8660_write(max8660, MAX8660_OVER2, mask, 0);
	222	}
	223
9392c4f0	224	static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
27f37e4b WS	225	{
27f37e4b WS	226	struct max8660 *max8660 = rdev_get_drvdata(rdev);
9392c4f0	227
27f37e4b WS	228	u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
27f37e4b WS	229	u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
9392c4f0	230	return selector;
27f37e4b WS	231	}
27f37e4b WS	232
5eb3394f AL	233	static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
5eb3394f AL	234	unsigned int selector)
27f37e4b WS	235	{
27f37e4b WS	236	struct max8660 *max8660 = rdev_get_drvdata(rdev);
3a93f2a9	237
27f37e4b WS	238	if (rdev_get_id(rdev) == MAX8660_V6)
	239	return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
	240	else
5eb3394f AL	241	return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
5eb3394f AL	242	selector << 4);
27f37e4b WS	243	}
	244
	245	static struct regulator_ops max8660_ldo67_ops = {
	246	.is_enabled = max8660_ldo67_is_enabled,
	247	.enable = max8660_ldo67_enable,
	248	.disable = max8660_ldo67_disable,
134d34a8	249	.list_voltage = regulator_list_voltage_linear,
5eb3394f	250	.map_voltage = regulator_map_voltage_linear,
9392c4f0	251	.get_voltage_sel = max8660_ldo67_get_voltage_sel,
5eb3394f	252	.set_voltage_sel = max8660_ldo67_set_voltage_sel,
27f37e4b WS	253	};
27f37e4b WS	254
621adb30	255	static const struct regulator_desc max8660_reg[] = {
27f37e4b WS	256	{
	257	.name = "V3(DCDC)",
	258	.id = MAX8660_V3,
	259	.ops = &max8660_dcdc_ops,
	260	.type = REGULATOR_VOLTAGE,
	261	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	262	.owner = THIS_MODULE,
134d34a8 AL	263	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	264	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	265	},
	266	{
	267	.name = "V4(DCDC)",
	268	.id = MAX8660_V4,
	269	.ops = &max8660_dcdc_ops,
	270	.type = REGULATOR_VOLTAGE,
	271	.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
	272	.owner = THIS_MODULE,
134d34a8 AL	273	.min_uV = MAX8660_DCDC_MIN_UV,
134d34a8 AL	274	.uV_step = MAX8660_DCDC_STEP,
27f37e4b WS	275	},
	276	{
	277	.name = "V5(LDO)",
	278	.id = MAX8660_V5,
	279	.ops = &max8660_ldo5_ops,
	280	.type = REGULATOR_VOLTAGE,
	281	.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
	282	.owner = THIS_MODULE,
134d34a8 AL	283	.min_uV = MAX8660_LDO5_MIN_UV,
134d34a8 AL	284	.uV_step = MAX8660_LDO5_STEP,
27f37e4b WS	285	},
	286	{
	287	.name = "V6(LDO)",
	288	.id = MAX8660_V6,
	289	.ops = &max8660_ldo67_ops,
	290	.type = REGULATOR_VOLTAGE,
	291	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	292	.owner = THIS_MODULE,
134d34a8 AL	293	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	294	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	295	},
	296	{
	297	.name = "V7(LDO)",
	298	.id = MAX8660_V7,
	299	.ops = &max8660_ldo67_ops,
	300	.type = REGULATOR_VOLTAGE,
	301	.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
	302	.owner = THIS_MODULE,
134d34a8 AL	303	.min_uV = MAX8660_LDO67_MIN_UV,
134d34a8 AL	304	.uV_step = MAX8660_LDO67_STEP,
27f37e4b WS	305	},
	306	};
	307
a5023574	308	static int max8660_probe(struct i2c_client *client,
308f100f	309	const struct i2c_device_id *i2c_id)
27f37e4b WS	310	{
	311	struct regulator_dev **rdev;
	312	struct max8660_platform_data *pdata = client->dev.platform_data;
c172708d	313	struct regulator_config config = { };
27f37e4b WS	314	struct max8660 *max8660;
	315	int boot_on, i, id, ret = -EINVAL;
	316
	317	if (pdata->num_subdevs > MAX8660_V_END) {
308f100f	318	dev_err(&client->dev, "Too many regulators found!\n");
4d26f7d5	319	return -EINVAL;
27f37e4b WS	320	}
27f37e4b WS	321
575f690d	322	max8660 = devm_kzalloc(&client->dev, sizeof(struct max8660) +
27f37e4b WS	323	sizeof(struct regulator_dev ) MAX8660_V_END,
27f37e4b WS	324	GFP_KERNEL);
4d26f7d5 AL	325	if (!max8660)
4d26f7d5 AL	326	return -ENOMEM;
27f37e4b WS	327
	328	max8660->client = client;
	329	rdev = max8660->rdev;
	330
	331	if (pdata->en34_is_high) {
	332	/* Simulate always on */
	333	max8660->shadow_regs[MAX8660_OVER1] = 5;
	334	} else {
	335	/* Otherwise devices can be toggled via software */
	336	max8660_dcdc_ops.enable = max8660_dcdc_enable;
	337	max8660_dcdc_ops.disable = max8660_dcdc_disable;
	338	}
	339
	340	/*
	341	* First, set up shadow registers to prevent glitches. As some
	342	* registers are shared between regulators, everything must be properly
	343	* set up for all regulators in advance.
	344	*/
	345	max8660->shadow_regs[MAX8660_ADTV1] =
	346	max8660->shadow_regs[MAX8660_ADTV2] =
	347	max8660->shadow_regs[MAX8660_SDTV1] =
	348	max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
	349	max8660->shadow_regs[MAX8660_MDTV1] =
	350	max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
	351
	352	for (i = 0; i < pdata->num_subdevs; i++) {
	353
	354	if (!pdata->subdevs[i].platform_data)
4d26f7d5	355	goto err_out;
27f37e4b WS	356
	357	boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
	358
	359	switch (pdata->subdevs[i].id) {
	360	case MAX8660_V3:
	361	if (boot_on)
	362	max8660->shadow_regs[MAX8660_OVER1] \|= 1;
	363	break;
	364
	365	case MAX8660_V4:
	366	if (boot_on)
	367	max8660->shadow_regs[MAX8660_OVER1] \|= 4;
	368	break;
	369
	370	case MAX8660_V5:
	371	break;
	372
	373	case MAX8660_V6:
	374	if (boot_on)
	375	max8660->shadow_regs[MAX8660_OVER2] \|= 2;
	376	break;
	377
	378	case MAX8660_V7:
	379	if (!strcmp(i2c_id->name, "max8661")) {
	380	dev_err(&client->dev, "Regulator not on this chip!\n");
4d26f7d5	381	goto err_out;
27f37e4b WS	382	}
	383
	384	if (boot_on)
	385	max8660->shadow_regs[MAX8660_OVER2] \|= 4;
	386	break;
	387
	388	default:
	389	dev_err(&client->dev, "invalid regulator %s\n",
	390	pdata->subdevs[i].name);
4d26f7d5	391	goto err_out;
27f37e4b WS	392	}
	393	}
	394
	395	/* Finally register devices */
	396	for (i = 0; i < pdata->num_subdevs; i++) {
	397
	398	id = pdata->subdevs[i].id;
	399
c172708d MB	400	config.dev = &client->dev;
	401	config.init_data = pdata->subdevs[i].platform_data;
	402	config.driver_data = max8660;
	403
	404	rdev[i] = regulator_register(&max8660_reg[id], &config);
27f37e4b WS	405	if (IS_ERR(rdev[i])) {
	406	ret = PTR_ERR(rdev[i]);
	407	dev_err(&client->dev, "failed to register %s\n",
	408	max8660_reg[id].name);
	409	goto err_unregister;
	410	}
	411	}
	412
53a4befa	413	i2c_set_clientdata(client, max8660);
27f37e4b WS	414	return 0;
	415
	416	err_unregister:
	417	while (--i >= 0)
	418	regulator_unregister(rdev[i]);
4d26f7d5	419	err_out:
27f37e4b WS	420	return ret;
	421	}
	422
8dc995f5	423	static int max8660_remove(struct i2c_client *client)
27f37e4b	424	{
53a4befa	425	struct max8660 *max8660 = i2c_get_clientdata(client);
27f37e4b WS	426	int i;
	427
	428	for (i = 0; i < MAX8660_V_END; i++)
020501f1	429	regulator_unregister(max8660->rdev[i]);
27f37e4b WS	430	return 0;
	431	}
	432
	433	static const struct i2c_device_id max8660_id[] = {
	434	{ "max8660", 0 },
	435	{ "max8661", 0 },
	436	{ }
	437	};
	438	MODULE_DEVICE_TABLE(i2c, max8660_id);
	439
	440	static struct i2c_driver max8660_driver = {
	441	.probe = max8660_probe,
5eb9f2b9	442	.remove = max8660_remove,
27f37e4b WS	443	.driver = {
27f37e4b WS	444	.name = "max8660",
308f100f	445	.owner = THIS_MODULE,
27f37e4b WS	446	},
	447	.id_table = max8660_id,
	448	};
	449
	450	static int __init max8660_init(void)
	451	{
	452	return i2c_add_driver(&max8660_driver);
	453	}
	454	subsys_initcall(max8660_init);
	455
	456	static void __exit max8660_exit(void)
	457	{
	458	i2c_del_driver(&max8660_driver);
	459	}
	460	module_exit(max8660_exit);
	461
	462	/* Module information */
	463	MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
	464	MODULE_AUTHOR("Wolfram Sang");
	465	MODULE_LICENSE("GPL v2");