[deliverable/linux.git] / drivers / regulator / da9055-regulator.c

/*
* Regulator driver for DA9055 PMIC
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>

#include <linux/mfd/da9055/core.h>
#include <linux/mfd/da9055/reg.h>
#include <linux/mfd/da9055/pdata.h>

#define DA9055_MIN_UA		0
#define DA9055_MAX_UA		3

#define DA9055_LDO_MODE_SYNC	0
#define DA9055_LDO_MODE_SLEEP	1

#define DA9055_BUCK_MODE_SLEEP	1
#define DA9055_BUCK_MODE_SYNC	2
#define DA9055_BUCK_MODE_AUTO	3

/* DA9055 REGULATOR IDs */
#define DA9055_ID_BUCK1	0
#define DA9055_ID_BUCK2	1
#define DA9055_ID_LDO1		2
#define DA9055_ID_LDO2		3
#define DA9055_ID_LDO3		4
#define DA9055_ID_LDO4		5
#define DA9055_ID_LDO5		6
#define DA9055_ID_LDO6		7

/* DA9055 BUCK current limit */
static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };

struct da9055_conf_reg {
	int reg;
	int sel_mask;
	int en_mask;
};

struct da9055_volt_reg {
	int reg_a;
	int reg_b;
	int sl_shift;
	int v_offset;
	int v_mask;
	int v_shift;
};

struct da9055_mode_reg {
	int reg;
	int mask;
	int shift;
};

struct da9055_regulator_info {
	struct regulator_desc reg_desc;
	struct da9055_conf_reg conf;
	struct da9055_volt_reg volt;
	struct da9055_mode_reg mode;
};

struct da9055_regulator {
	struct da9055 *da9055;
	struct da9055_regulator_info *info;
	struct regulator_dev *rdev;
	enum gpio_select reg_rselect;
};

static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret, mode = 0;

	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
	if (ret < 0)
		return ret;

	switch ((ret & info->mode.mask) >> info->mode.shift) {
	case DA9055_BUCK_MODE_SYNC:
		mode = REGULATOR_MODE_FAST;
		break;
	case DA9055_BUCK_MODE_AUTO:
		mode = REGULATOR_MODE_NORMAL;
		break;
	case DA9055_BUCK_MODE_SLEEP:
		mode = REGULATOR_MODE_STANDBY;
		break;
	}

	return mode;
}

static int da9055_buck_set_mode(struct regulator_dev *rdev,
					unsigned int mode)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
		break;
	case REGULATOR_MODE_NORMAL:
		val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
		break;
	case REGULATOR_MODE_STANDBY:
		val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
		break;
	}

	return da9055_reg_update(regulator->da9055, info->mode.reg,
				 info->mode.mask, val);
}

static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
	if (ret < 0)
		return ret;

	if (ret >> info->volt.sl_shift)
		return REGULATOR_MODE_STANDBY;
	else
		return REGULATOR_MODE_NORMAL;
}

static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	struct da9055_volt_reg volt = info->volt;
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
	case REGULATOR_MODE_FAST:
		val = DA9055_LDO_MODE_SYNC;
		break;
	case REGULATOR_MODE_STANDBY:
		val = DA9055_LDO_MODE_SLEEP;
		break;
	}

	return da9055_reg_update(regulator->da9055, volt.reg_b,
				 1 << volt.sl_shift,
				 val << volt.sl_shift);
}

static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
	if (ret < 0)
		return ret;

	ret &= info->mode.mask;
	return da9055_current_limits[ret >> info->mode.shift];
}

static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
					 int max_uA)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int i, val = 0;

	if (min_uA > da9055_current_limits[DA9055_MAX_UA] ||
	    max_uA < da9055_current_limits[DA9055_MIN_UA])
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(da9055_current_limits); i++) {
		if (min_uA <= da9055_current_limits[i]) {
			val = i;
			break;
		}
	}

	return da9055_reg_update(regulator->da9055, DA9055_REG_BUCK_LIM,
				info->mode.mask, val << info->mode.shift);
}

static int da9055_list_voltage(struct regulator_dev *rdev, unsigned selector)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;

	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;

	if (selector < info->volt.v_offset)
		return 0;

	selector -= info->volt.v_offset;
	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
}

static int da9055_map_voltage(struct regulator_dev *rdev, int min_uV,
			      int max_uV)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int sel, voltage;

	if (min_uV < rdev->desc->min_uV)
		min_uV = rdev->desc->min_uV;

	sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
	sel += info->volt.v_offset;

	voltage = da9055_list_voltage(rdev, sel);
	if (voltage < min_uV || voltage > max_uV)
		return -EINVAL;

	return sel;
}

static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	struct da9055_volt_reg volt = info->volt;
	int ret, sel;

	/*
	 * There are two voltage register set A & B for voltage ramping but
	 * either one of then can be active therefore we first determine
	 * the active register set.
	 */
	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
	if (ret < 0)
		return ret;

	ret &= info->conf.sel_mask;

	/* Get the voltage for the active register set A/B */
	if (ret == DA9055_REGUALTOR_SET_A)
		ret = da9055_reg_read(regulator->da9055, volt.reg_a);
	else
		ret = da9055_reg_read(regulator->da9055, volt.reg_b);

	if (ret < 0)
		return ret;

	sel = (ret & volt.v_mask);
	if (sel <= volt.v_offset)
		return 0;
	else
		return sel;
}

static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
					    unsigned int selector)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	/*
	 * Regulator register set A/B is not selected through GPIO therefore
	 * we use default register set A for voltage ramping.
	 */
	if (regulator->reg_rselect == NO_GPIO) {
		/* Select register set A */
		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
					info->conf.sel_mask, DA9055_SEL_REG_A);
		if (ret < 0)
			return ret;

		/* Set the voltage */
		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
					 info->volt.v_mask, selector);
	}

	/*
	 * Here regulator register set A/B is selected through GPIO.
	 * Therefore we first determine the selected register set A/B and
	 * then set the desired voltage for that register set A/B.
	 */
	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
	if (ret < 0)
		return ret;

	ret &= info->conf.sel_mask;

	/* Set the voltage */
	if (ret == DA9055_REGUALTOR_SET_A)
		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
					 info->volt.v_mask, selector);
	else
		return da9055_reg_update(regulator->da9055, info->volt.reg_b,
					 info->volt.v_mask, selector);
}

static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
						int uV)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	/* Select register set B for suspend voltage ramping. */
	if (regulator->reg_rselect == NO_GPIO) {
		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
					info->conf.sel_mask, DA9055_SEL_REG_B);
		if (ret < 0)
			return ret;
	}

	ret = da9055_map_voltage(rdev, uV, uV);
	if (ret < 0)
		return ret;

	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
				 info->volt.v_mask, ret);
}

static int da9055_suspend_enable(struct regulator_dev *rdev)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;

	/* Select register set B for voltage ramping. */
	if (regulator->reg_rselect == NO_GPIO)
		return da9055_reg_update(regulator->da9055, info->conf.reg,
					info->conf.sel_mask, DA9055_SEL_REG_B);
	else
		return 0;
}

static int da9055_suspend_disable(struct regulator_dev *rdev)
{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;

	/* Diselect register set B. */
	if (regulator->reg_rselect == NO_GPIO)
		return da9055_reg_update(regulator->da9055, info->conf.reg,
					info->conf.sel_mask, DA9055_SEL_REG_A);
	else
		return 0;
}

static struct regulator_ops da9055_buck_ops = {
	.get_mode = da9055_buck_get_mode,
	.set_mode = da9055_buck_set_mode,

	.get_current_limit = da9055_buck_get_current_limit,
	.set_current_limit = da9055_buck_set_current_limit,

	.get_voltage_sel = da9055_regulator_get_voltage_sel,
	.set_voltage_sel = da9055_regulator_set_voltage_sel,
	.list_voltage = da9055_list_voltage,
	.map_voltage = da9055_map_voltage,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,

	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
	.set_suspend_enable = da9055_suspend_enable,
	.set_suspend_disable = da9055_suspend_disable,
	.set_suspend_mode = da9055_buck_set_mode,
};

static struct regulator_ops da9055_ldo_ops = {
	.get_mode = da9055_ldo_get_mode,
	.set_mode = da9055_ldo_set_mode,

	.get_voltage_sel = da9055_regulator_get_voltage_sel,
	.set_voltage_sel = da9055_regulator_set_voltage_sel,
	.list_voltage = da9055_list_voltage,
	.map_voltage = da9055_map_voltage,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,

	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
	.set_suspend_enable = da9055_suspend_enable,
	.set_suspend_disable = da9055_suspend_disable,
	.set_suspend_mode = da9055_ldo_set_mode,

};

#define DA9055_LDO(_id, step, min, max, vbits, voffset) \
{\
	.reg_desc = {\
		.name = #_id,\
		.ops = &da9055_ldo_ops,\
		.type = REGULATOR_VOLTAGE,\
		.id = DA9055_ID_##_id,\
		.n_voltages = (max - min) / step + 1 + (voffset), \
		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
		.enable_mask = 1, \
		.min_uV = (min) * 1000,\
		.uV_step = (step) * 1000,\
		.owner = THIS_MODULE,\
	},\
	.conf = {\
		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
		.sel_mask = (1 << 4),\
		.en_mask = 1,\
	},\
	.volt = {\
		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
		.sl_shift = 7,\
		.v_offset = (voffset),\
		.v_mask = (1 << (vbits)) - 1,\
		.v_shift = (vbits),\
	},\
}

#define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
{\
	.reg_desc = {\
		.name = #_id,\
		.ops = &da9055_buck_ops,\
		.type = REGULATOR_VOLTAGE,\
		.id = DA9055_ID_##_id,\
		.n_voltages = (max - min) / step + 1 + (voffset), \
		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
		.enable_mask = 1,\
		.min_uV = (min) * 1000,\
		.uV_step = (step) * 1000,\
		.owner = THIS_MODULE,\
	},\
	.conf = {\
		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
		.sel_mask = (1 << 4),\
		.en_mask = 1,\
	},\
	.volt = {\
		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
		.sl_shift = 7,\
		.v_offset = (voffset),\
		.v_mask = (1 << (vbits)) - 1,\
		.v_shift = (vbits),\
	},\
	.mode = {\
		.reg = DA9055_REG_BCORE_MODE,\
		.mask = (mbits),\
		.shift = (sbits),\
	},\
}

static struct da9055_regulator_info da9055_regulator_info[] = {
	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
};

/*
 * Configures regulator to be controlled either through GPIO 1 or 2.
 * GPIO can control regulator state and/or select the regulator register
 * set A/B for voltage ramping.
 */
static __devinit int da9055_gpio_init(struct da9055_regulator *regulator,
				      struct regulator_config *config,
				      struct da9055_pdata *pdata, int id)
{
	struct da9055_regulator_info *info = regulator->info;
	int ret = 0;

	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
		char name[18];
		int gpio_mux = pdata->gpio_ren[id];

		config->ena_gpio = pdata->ena_gpio[id];
		config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
		config->ena_gpio_invert = 1;

		/*
		 * GPI pin is muxed with regulator to control the
		 * regulator state.
		 */
		sprintf(name, "DA9055 GPI %d", gpio_mux);
		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
					    name);
		if (ret < 0)
			goto err;

		/*
		 * Let the regulator know that its state is controlled
		 * through GPI.
		 */
		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
					DA9055_E_GPI_MASK,
					pdata->reg_ren[id]
					<< DA9055_E_GPI_SHIFT);
		if (ret < 0)
			goto err;
	}

	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
		char name[18];
		int gpio_mux = pdata->gpio_rsel[id];

		regulator->reg_rselect = pdata->reg_rsel[id];

		/*
		 * GPI pin is muxed with regulator to select the
		 * regulator register set A/B for voltage ramping.
		 */
		sprintf(name, "DA9055 GPI %d", gpio_mux);
		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
					    name);
		if (ret < 0)
			goto err;

		/*
		 * Let the regulator know that its register set A/B
		 * will be selected through GPI for voltage ramping.
		 */
		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
					DA9055_V_GPI_MASK,
					pdata->reg_rsel[id]
					<< DA9055_V_GPI_SHIFT);
	}

err:
	return ret;
}

static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
{
	struct da9055_regulator *regulator = data;

	regulator_notifier_call_chain(regulator->rdev,
				      REGULATOR_EVENT_OVER_CURRENT, NULL);

	return IRQ_HANDLED;
}

static inline struct da9055_regulator_info *find_regulator_info(int id)
{
	struct da9055_regulator_info *info;
	int i;

	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
		info = &da9055_regulator_info[i];
		if (info->reg_desc.id == id)
			return info;
	}

	return NULL;
}

static int __devinit da9055_regulator_probe(struct platform_device *pdev)
{
	struct regulator_config config = { };
	struct da9055_regulator *regulator;
	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
	struct da9055_pdata *pdata = da9055->dev->platform_data;
	int ret, irq;

	if (pdata == NULL || pdata->regulators[pdev->id] == NULL)
		return -ENODEV;

	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
				 GFP_KERNEL);
	if (!regulator)
		return -ENOMEM;

	regulator->info = find_regulator_info(pdev->id);
	if (regulator->info == NULL) {
		dev_err(&pdev->dev, "invalid regulator ID specified\n");
		return -EINVAL;
	}

	regulator->da9055 = da9055;
	config.dev = &pdev->dev;
	config.driver_data = regulator;
	config.regmap = da9055->regmap;

	if (pdata && pdata->regulators)
		config.init_data = pdata->regulators[pdev->id];

	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
	if (ret < 0)
		return ret;

	regulator->rdev = regulator_register(&regulator->info->reg_desc,
					     &config);
	if (IS_ERR(regulator->rdev)) {
		dev_err(&pdev->dev, "Failed to register regulator %s\n",
			regulator->info->reg_desc.name);
		ret = PTR_ERR(regulator->rdev);
		return ret;
	}

	/* Only LDO 5 and 6 has got the over current interrupt */
	if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
		irq = platform_get_irq_byname(pdev, "REGULATOR");
		irq = regmap_irq_get_virq(da9055->irq_data, irq);
		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
						da9055_ldo5_6_oc_irq,
						IRQF_TRIGGER_HIGH |
						IRQF_ONESHOT |
						IRQF_PROBE_SHARED,
						pdev->name, regulator);
		if (ret != 0) {
			if (ret != -EBUSY) {
				dev_err(&pdev->dev,
				"Failed to request Regulator IRQ %d: %d\n",
				irq, ret);
				goto err_regulator;
			}
		}
	}

	platform_set_drvdata(pdev, regulator);

	return 0;

err_regulator:
	regulator_unregister(regulator->rdev);
	return ret;
}

static int __devexit da9055_regulator_remove(struct platform_device *pdev)
{
	struct da9055_regulator *regulator = platform_get_drvdata(pdev);

	regulator_unregister(regulator->rdev);

	return 0;
}

static struct platform_driver da9055_regulator_driver = {
	.probe = da9055_regulator_probe,
	.remove = __devexit_p(da9055_regulator_remove),
	.driver = {
		.name = "da9055-regulator",
		.owner = THIS_MODULE,
	},
};

static int __init da9055_regulator_init(void)
{
	return platform_driver_register(&da9055_regulator_driver);
}
subsys_initcall(da9055_regulator_init);

static void __exit da9055_regulator_exit(void)
{
	platform_driver_unregister(&da9055_regulator_driver);
}
module_exit(da9055_regulator_exit);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9055-regulator");
Commit	Line	Data
f6130be6 AJ	1	/*
	2	* Regulator driver for DA9055 PMIC
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <dchen@diasemi.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/err.h>
	18	#include <linux/gpio.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regulator/driver.h>
	21	#include <linux/regulator/machine.h>
	22
	23	#include <linux/mfd/da9055/core.h>
	24	#include <linux/mfd/da9055/reg.h>
	25	#include <linux/mfd/da9055/pdata.h>
	26
	27	#define DA9055_MIN_UA 0
	28	#define DA9055_MAX_UA 3
	29
	30	#define DA9055_LDO_MODE_SYNC 0
	31	#define DA9055_LDO_MODE_SLEEP 1
	32
	33	#define DA9055_BUCK_MODE_SLEEP 1
	34	#define DA9055_BUCK_MODE_SYNC 2
	35	#define DA9055_BUCK_MODE_AUTO 3
	36
	37	/* DA9055 REGULATOR IDs */
	38	#define DA9055_ID_BUCK1 0
	39	#define DA9055_ID_BUCK2 1
	40	#define DA9055_ID_LDO1 2
	41	#define DA9055_ID_LDO2 3
	42	#define DA9055_ID_LDO3 4
	43	#define DA9055_ID_LDO4 5
	44	#define DA9055_ID_LDO5 6
	45	#define DA9055_ID_LDO6 7
	46
	47	/* DA9055 BUCK current limit */
	48	static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
	49
	50	struct da9055_conf_reg {
	51	int reg;
	52	int sel_mask;
	53	int en_mask;
	54	};
	55
	56	struct da9055_volt_reg {
	57	int reg_a;
	58	int reg_b;
	59	int sl_shift;
	60	int v_offset;
	61	int v_mask;
	62	int v_shift;
	63	};
	64
65	struct da9055_mode_reg {
66	int reg;
67	int mask;
68	int shift;
69	};
70
71	struct da9055_regulator_info {
72	struct regulator_desc reg_desc;
73	struct da9055_conf_reg conf;
74	struct da9055_volt_reg volt;
75	struct da9055_mode_reg mode;
76	};
77
78	struct da9055_regulator {
79	struct da9055 *da9055;
80	struct da9055_regulator_info *info;
81	struct regulator_dev *rdev;
82	enum gpio_select reg_rselect;
83	};
84
85	static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
86	{
87	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
88	struct da9055_regulator_info *info = regulator->info;
89	int ret, mode = 0;
90
91	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
92	if (ret < 0)
93	return ret;
94
95	switch ((ret & info->mode.mask) >> info->mode.shift) {
96	case DA9055_BUCK_MODE_SYNC:
97	mode = REGULATOR_MODE_FAST;
98	break;
99	case DA9055_BUCK_MODE_AUTO:
100	mode = REGULATOR_MODE_NORMAL;
101	break;
102	case DA9055_BUCK_MODE_SLEEP:
103	mode = REGULATOR_MODE_STANDBY;
104	break;
105	}
106
107	return mode;
108	}
109
110	static int da9055_buck_set_mode(struct regulator_dev *rdev,
111	unsigned int mode)
112	{
113	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
114	struct da9055_regulator_info *info = regulator->info;
115	int val = 0;
116
117	switch (mode) {
118	case REGULATOR_MODE_FAST:
119	val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
120	break;
121	case REGULATOR_MODE_NORMAL:
122	val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
123	break;
124	case REGULATOR_MODE_STANDBY:
125	val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
126	break;
127	}
128
129	return da9055_reg_update(regulator->da9055, info->mode.reg,
130	info->mode.mask, val);
131	}
132
133	static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
134	{
135	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
136	struct da9055_regulator_info *info = regulator->info;
137	int ret;
138
139	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
140	if (ret < 0)
141	return ret;
142
143	if (ret >> info->volt.sl_shift)
144	return REGULATOR_MODE_STANDBY;
145	else
146	return REGULATOR_MODE_NORMAL;
147	}
148
149	static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
150	{
151	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
152	struct da9055_regulator_info *info = regulator->info;
153	struct da9055_volt_reg volt = info->volt;
154	int val = 0;
155
156	switch (mode) {
157	case REGULATOR_MODE_NORMAL:
158	case REGULATOR_MODE_FAST:
159	val = DA9055_LDO_MODE_SYNC;
160	break;
161	case REGULATOR_MODE_STANDBY:
162	val = DA9055_LDO_MODE_SLEEP;
163	break;
164	}
165
166	return da9055_reg_update(regulator->da9055, volt.reg_b,
167	1 << volt.sl_shift,
168	val << volt.sl_shift);
169	}
170
171	static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
172	{
173	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
174	struct da9055_regulator_info *info = regulator->info;
175	int ret;
176
177	ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
178	if (ret < 0)
179	return ret;
180
181	ret &= info->mode.mask;
182	return da9055_current_limits[ret >> info->mode.shift];
183	}
184
185	static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
186	int max_uA)
187	{
188	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
189	struct da9055_regulator_info *info = regulator->info;
190	int i, val = 0;
191
192	if (min_uA > da9055_current_limits[DA9055_MAX_UA] \|\|
193	max_uA < da9055_current_limits[DA9055_MIN_UA])
194	return -EINVAL;
195
196	for (i = 0; i < ARRAY_SIZE(da9055_current_limits); i++) {
197	if (min_uA <= da9055_current_limits[i]) {
198	val = i;
199	break;
200	}
201	}
202
203	return da9055_reg_update(regulator->da9055, DA9055_REG_BUCK_LIM,
204	info->mode.mask, val << info->mode.shift);
205	}
206
369cf602 AL	207	static int da9055_list_voltage(struct regulator_dev *rdev, unsigned selector)
	208	{
	209	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	210	struct da9055_regulator_info *info = regulator->info;
	211
	212	if (selector >= rdev->desc->n_voltages)
	213	return -EINVAL;
	214
	215	if (selector < info->volt.v_offset)
	216	return 0;
	217
	218	selector -= info->volt.v_offset;
	219	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
	220	}
	221
	222	static int da9055_map_voltage(struct regulator_dev *rdev, int min_uV,
	223	int max_uV)
	224	{
	225	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	226	struct da9055_regulator_info *info = regulator->info;
	227	int sel, voltage;
	228
	229	if (min_uV < rdev->desc->min_uV)
	230	min_uV = rdev->desc->min_uV;
	231
	232	sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
	233	sel += info->volt.v_offset;
	234
	235	voltage = da9055_list_voltage(rdev, sel);
	236	if (voltage < min_uV \|\| voltage > max_uV)
	237	return -EINVAL;
	238
	239	return sel;
	240	}
	241
f6130be6 AJ	242	static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
	243	{
	244	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	245	struct da9055_regulator_info *info = regulator->info;
	246	struct da9055_volt_reg volt = info->volt;
	247	int ret, sel;
	248
	249	/*
	250	* There are two voltage register set A & B for voltage ramping but
	251	* either one of then can be active therefore we first determine
	252	* the active register set.
	253	*/
	254	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
	255	if (ret < 0)
	256	return ret;
	257
	258	ret &= info->conf.sel_mask;
	259
	260	/* Get the voltage for the active register set A/B */
	261	if (ret == DA9055_REGUALTOR_SET_A)
	262	ret = da9055_reg_read(regulator->da9055, volt.reg_a);
	263	else
	264	ret = da9055_reg_read(regulator->da9055, volt.reg_b);
	265
	266	if (ret < 0)
	267	return ret;
	268
	269	sel = (ret & volt.v_mask);
	270	if (sel <= volt.v_offset)
	271	return 0;
	272	else
	273	return sel;
	274	}
	275
f6130be6 AJ	276	static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
	277	unsigned int selector)
	278	{
	279	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	280	struct da9055_regulator_info *info = regulator->info;
	281	int ret;
	282
	283	/*
	284	* Regulator register set A/B is not selected through GPIO therefore
	285	* we use default register set A for voltage ramping.
	286	*/
	287	if (regulator->reg_rselect == NO_GPIO) {
	288	/* Select register set A */
	289	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	290	info->conf.sel_mask, DA9055_SEL_REG_A);
	291	if (ret < 0)
	292	return ret;
	293
	294	/* Set the voltage */
369cf602 AL	295	return da9055_reg_update(regulator->da9055, info->volt.reg_a,
369cf602 AL	296	info->volt.v_mask, selector);
f6130be6 AJ	297	}
	298
	299	/*
	300	* Here regulator register set A/B is selected through GPIO.
	301	* Therefore we first determine the selected register set A/B and
	302	* then set the desired voltage for that register set A/B.
	303	*/
	304	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
	305	if (ret < 0)
	306	return ret;
	307
	308	ret &= info->conf.sel_mask;
	309
	310	/* Set the voltage */
	311	if (ret == DA9055_REGUALTOR_SET_A)
369cf602 AL	312	return da9055_reg_update(regulator->da9055, info->volt.reg_a,
369cf602 AL	313	info->volt.v_mask, selector);
f6130be6	314	else
369cf602 AL	315	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
369cf602 AL	316	info->volt.v_mask, selector);
f6130be6 AJ	317	}
	318
	319	static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
	320	int uV)
	321	{
	322	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	323	struct da9055_regulator_info *info = regulator->info;
	324	int ret;
	325
	326	/* Select register set B for suspend voltage ramping. */
	327	if (regulator->reg_rselect == NO_GPIO) {
	328	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	329	info->conf.sel_mask, DA9055_SEL_REG_B);
	330	if (ret < 0)
	331	return ret;
	332	}
	333
369cf602	334	ret = da9055_map_voltage(rdev, uV, uV);
f6130be6 AJ	335	if (ret < 0)
	336	return ret;
	337
369cf602 AL	338	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
369cf602 AL	339	info->volt.v_mask, ret);
f6130be6 AJ	340	}
	341
	342	static int da9055_suspend_enable(struct regulator_dev *rdev)
	343	{
	344	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	345	struct da9055_regulator_info *info = regulator->info;
	346
	347	/* Select register set B for voltage ramping. */
	348	if (regulator->reg_rselect == NO_GPIO)
	349	return da9055_reg_update(regulator->da9055, info->conf.reg,
	350	info->conf.sel_mask, DA9055_SEL_REG_B);
	351	else
	352	return 0;
	353	}
	354
	355	static int da9055_suspend_disable(struct regulator_dev *rdev)
	356	{
	357	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	358	struct da9055_regulator_info *info = regulator->info;
	359
	360	/* Diselect register set B. */
	361	if (regulator->reg_rselect == NO_GPIO)
	362	return da9055_reg_update(regulator->da9055, info->conf.reg,
	363	info->conf.sel_mask, DA9055_SEL_REG_A);
	364	else
	365	return 0;
	366	}
	367
	368	static struct regulator_ops da9055_buck_ops = {
	369	.get_mode = da9055_buck_get_mode,
	370	.set_mode = da9055_buck_set_mode,
	371
	372	.get_current_limit = da9055_buck_get_current_limit,
	373	.set_current_limit = da9055_buck_set_current_limit,
	374
	375	.get_voltage_sel = da9055_regulator_get_voltage_sel,
	376	.set_voltage_sel = da9055_regulator_set_voltage_sel,
369cf602 AL	377	.list_voltage = da9055_list_voltage,
369cf602 AL	378	.map_voltage = da9055_map_voltage,
f6130be6 AJ	379	.is_enabled = regulator_is_enabled_regmap,
	380	.enable = regulator_enable_regmap,
	381	.disable = regulator_disable_regmap,
	382
	383	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
	384	.set_suspend_enable = da9055_suspend_enable,
	385	.set_suspend_disable = da9055_suspend_disable,
	386	.set_suspend_mode = da9055_buck_set_mode,
	387	};
	388
	389	static struct regulator_ops da9055_ldo_ops = {
	390	.get_mode = da9055_ldo_get_mode,
	391	.set_mode = da9055_ldo_set_mode,
	392
	393	.get_voltage_sel = da9055_regulator_get_voltage_sel,
	394	.set_voltage_sel = da9055_regulator_set_voltage_sel,
369cf602 AL	395	.list_voltage = da9055_list_voltage,
369cf602 AL	396	.map_voltage = da9055_map_voltage,
f6130be6 AJ	397	.is_enabled = regulator_is_enabled_regmap,
	398	.enable = regulator_enable_regmap,
	399	.disable = regulator_disable_regmap,
	400
	401	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
	402	.set_suspend_enable = da9055_suspend_enable,
	403	.set_suspend_disable = da9055_suspend_disable,
	404	.set_suspend_mode = da9055_ldo_set_mode,
	405
	406	};
	407
	408	#define DA9055_LDO(_id, step, min, max, vbits, voffset) \
	409	{\
	410	.reg_desc = {\
	411	.name = #_id,\
	412	.ops = &da9055_ldo_ops,\
	413	.type = REGULATOR_VOLTAGE,\
	414	.id = DA9055_ID_##_id,\
369cf602	415	.n_voltages = (max - min) / step + 1 + (voffset), \
f6130be6 AJ	416	.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	417	.enable_mask = 1, \
	418	.min_uV = (min) * 1000,\
	419	.uV_step = (step) * 1000,\
	420	.owner = THIS_MODULE,\
	421	},\
	422	.conf = {\
	423	.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	424	.sel_mask = (1 << 4),\
	425	.en_mask = 1,\
	426	},\
	427	.volt = {\
	428	.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
	429	.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
	430	.sl_shift = 7,\
	431	.v_offset = (voffset),\
	432	.v_mask = (1 << (vbits)) - 1,\
	433	.v_shift = (vbits),\
	434	},\
	435	}
	436
	437	#define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
	438	{\
	439	.reg_desc = {\
	440	.name = #_id,\
	441	.ops = &da9055_buck_ops,\
	442	.type = REGULATOR_VOLTAGE,\
	443	.id = DA9055_ID_##_id,\
369cf602	444	.n_voltages = (max - min) / step + 1 + (voffset), \
f6130be6 AJ	445	.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	446	.enable_mask = 1,\
	447	.min_uV = (min) * 1000,\
	448	.uV_step = (step) * 1000,\
	449	.owner = THIS_MODULE,\
	450	},\
	451	.conf = {\
	452	.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	453	.sel_mask = (1 << 4),\
	454	.en_mask = 1,\
	455	},\
	456	.volt = {\
	457	.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
	458	.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
	459	.sl_shift = 7,\
	460	.v_offset = (voffset),\
	461	.v_mask = (1 << (vbits)) - 1,\
	462	.v_shift = (vbits),\
	463	},\
	464	.mode = {\
	465	.reg = DA9055_REG_BCORE_MODE,\
	466	.mask = (mbits),\
	467	.shift = (sbits),\
	468	},\
	469	}
	470
	471	static struct da9055_regulator_info da9055_regulator_info[] = {
	472	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
	473	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
	474	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
	475	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
	476	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
	477	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
	478	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
	479	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
	480	};
	481
	482	/*
	483	* Configures regulator to be controlled either through GPIO 1 or 2.
	484	* GPIO can control regulator state and/or select the regulator register
	485	* set A/B for voltage ramping.
	486	*/
	487	static __devinit int da9055_gpio_init(struct da9055_regulator *regulator,
	488	struct regulator_config *config,
	489	struct da9055_pdata *pdata, int id)
	490	{
	491	struct da9055_regulator_info *info = regulator->info;
	492	int ret = 0;
	493
	494	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
	495	char name[18];
	496	int gpio_mux = pdata->gpio_ren[id];
	497
	498	config->ena_gpio = pdata->ena_gpio[id];
	499	config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
	500	config->ena_gpio_invert = 1;
	501
	502	/*
	503	* GPI pin is muxed with regulator to control the
	504	* regulator state.
	505	*/
	506	sprintf(name, "DA9055 GPI %d", gpio_mux);
	507	ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
	508	name);
509	if (ret < 0)
510	goto err;
511
512	/*
513	* Let the regulator know that its state is controlled
514	* through GPI.
515	*/
516	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
517	DA9055_E_GPI_MASK,
518	pdata->reg_ren[id]
519	<< DA9055_E_GPI_SHIFT);
520	if (ret < 0)
521	goto err;
522	}
523
26cbd307	524	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
f6130be6 AJ	525	char name[18];
	526	int gpio_mux = pdata->gpio_rsel[id];
	527
	528	regulator->reg_rselect = pdata->reg_rsel[id];
	529
	530	/*
	531	* GPI pin is muxed with regulator to select the
	532	* regulator register set A/B for voltage ramping.
	533	*/
	534	sprintf(name, "DA9055 GPI %d", gpio_mux);
	535	ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
	536	name);
	537	if (ret < 0)
	538	goto err;
	539
	540	/*
	541	* Let the regulator know that its register set A/B
	542	* will be selected through GPI for voltage ramping.
	543	*/
	544	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	545	DA9055_V_GPI_MASK,
	546	pdata->reg_rsel[id]
	547	<< DA9055_V_GPI_SHIFT);
	548	}
	549
	550	err:
	551	return ret;
	552	}
	553
	554	static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
	555	{
	556	struct da9055_regulator *regulator = data;
	557
	558	regulator_notifier_call_chain(regulator->rdev,
	559	REGULATOR_EVENT_OVER_CURRENT, NULL);
	560
	561	return IRQ_HANDLED;
	562	}
	563
	564	static inline struct da9055_regulator_info *find_regulator_info(int id)
	565	{
	566	struct da9055_regulator_info *info;
	567	int i;
	568
	569	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
	570	info = &da9055_regulator_info[i];
	571	if (info->reg_desc.id == id)
	572	return info;
	573	}
	574
	575	return NULL;
	576	}
	577
	578	static int __devinit da9055_regulator_probe(struct platform_device *pdev)
	579	{
	580	struct regulator_config config = { };
	581	struct da9055_regulator *regulator;
	582	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
	583	struct da9055_pdata *pdata = da9055->dev->platform_data;
	584	int ret, irq;
	585
	586	if (pdata == NULL \|\| pdata->regulators[pdev->id] == NULL)
	587	return -ENODEV;
	588
589	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
590	GFP_KERNEL);
591	if (!regulator)
592	return -ENOMEM;
593
594	regulator->info = find_regulator_info(pdev->id);
595	if (regulator->info == NULL) {
596	dev_err(&pdev->dev, "invalid regulator ID specified\n");
597	return -EINVAL;
598	}
599
600	regulator->da9055 = da9055;
601	config.dev = &pdev->dev;
602	config.driver_data = regulator;
603	config.regmap = da9055->regmap;
604
605	if (pdata && pdata->regulators)
606	config.init_data = pdata->regulators[pdev->id];
607
608	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
609	if (ret < 0)
610	return ret;
611
612	regulator->rdev = regulator_register(&regulator->info->reg_desc,
613	&config);
614	if (IS_ERR(regulator->rdev)) {
615	dev_err(&pdev->dev, "Failed to register regulator %s\n",
616	regulator->info->reg_desc.name);
617	ret = PTR_ERR(regulator->rdev);
618	return ret;
619	}
620
621	/* Only LDO 5 and 6 has got the over current interrupt */
622	if (pdev->id == DA9055_ID_LDO5 \|\| pdev->id == DA9055_ID_LDO6) {
623	irq = platform_get_irq_byname(pdev, "REGULATOR");
624	irq = regmap_irq_get_virq(da9055->irq_data, irq);
625	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
626	da9055_ldo5_6_oc_irq,
627	IRQF_TRIGGER_HIGH \|
628	IRQF_ONESHOT \|
629	IRQF_PROBE_SHARED,
630	pdev->name, regulator);
631	if (ret != 0) {
632	if (ret != -EBUSY) {
633	dev_err(&pdev->dev,
634	"Failed to request Regulator IRQ %d: %d\n",
635	irq, ret);
636	goto err_regulator;
637	}
638	}
639	}
640
641	platform_set_drvdata(pdev, regulator);
642
643	return 0;
644
645	err_regulator:
646	regulator_unregister(regulator->rdev);
647	return ret;
648	}
649
650	static int __devexit da9055_regulator_remove(struct platform_device *pdev)
651	{
652	struct da9055_regulator *regulator = platform_get_drvdata(pdev);
653
654	regulator_unregister(regulator->rdev);
655
656	return 0;
657	}
658
659	static struct platform_driver da9055_regulator_driver = {
660	.probe = da9055_regulator_probe,
661	.remove = __devexit_p(da9055_regulator_remove),
662	.driver = {
663	.name = "da9055-regulator",
664	.owner = THIS_MODULE,
665	},
666	};
667
668	static int __init da9055_regulator_init(void)
669	{
670	return platform_driver_register(&da9055_regulator_driver);
671	}
672	subsys_initcall(da9055_regulator_init);
673
674	static void __exit da9055_regulator_exit(void)
675	{
676	platform_driver_unregister(&da9055_regulator_driver);
677	}
678	module_exit(da9055_regulator_exit);
679
680	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
681	MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
682	MODULE_LICENSE("GPL");
683	MODULE_ALIAS("platform:da9055-regulator");