Commit 99cf3af5 authored by James Ban's avatar James Ban Committed by Mark Brown
Browse files

regulator: pv88080: new regulator driver 



This is the driver for the Powerventure PV88080 BUCKs regulator.
It communicates via an I2C bus to the device.

Signed-off-by: default avatarJames Ban <James.Ban..opensource@diasemi.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f55532a0

Documentation/devicetree/bindings/regulator/pv88080.txt

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* Powerventure Semiconductor PV88080 Voltage Regulator



Required properties:

- compatible: "pvs,pv88080".

- reg: I2C slave address, usually 0x49.

- interrupts: the interrupt outputs of the controller

- regulators: A node that houses a sub-node for each regulator within the

  device. Each sub-node is identified using the node's name, with valid

  values listed below. The content of each sub-node is defined by the

  standard binding for regulators; see regulator.txt.

  BUCK1, BUCK2, and BUCK3.



Optional properties:

- Any optional property defined in regulator.txt



Example



	pmic: pv88080@49 {

		compatible = "pvs,pv88080";

		reg = <0x49>;

		interrupt-parent = <&gpio>;

		interrupts = <24 24>;



		regulators {

			BUCK1 {

				regulator-name = "buck1";

				regulator-min-microvolt = < 600000>;

				regulator-max-microvolt = <1393750>;

				regulator-min-microamp 	= < 220000>;

				regulator-max-microamp 	= <7040000>;

			};



			BUCK2 {

				regulator-name = "buck2";

				regulator-min-microvolt = < 600000>;

				regulator-max-microvolt = <1393750>;

				regulator-min-microamp 	= <1496000>;

				regulator-max-microamp 	= <4189000>;

			};



			BUCK3 {

				regulator-name = "buck3";

				regulator-min-microvolt = <1400000>;

				regulator-max-microvolt = <2193750>;

				regulator-min-microamp 	= <1496000>;

				regulator-max-microamp 	= <4189000>;

			};

		};

	};

drivers/regulator/Kconfig

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@@ -548,6 +548,13 @@ config REGULATOR_PV88060 
	  Say y here to support the voltage regulators and convertors

	  PV88060



config REGULATOR_PV88080

	tristate "Powerventure Semiconductor PV88080 regulator"

	depends on I2C

	select REGMAP_I2C

	help

	  Say y here to support the buck convertors on PV88080



config REGULATOR_PV88090

	tristate "Powerventure Semiconductor PV88090 regulator"

	depends on I2C

drivers/regulator/Makefile

+1 −0
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@@ -71,6 +71,7 @@ obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o 
obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o

obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o

obj-$(CONFIG_REGULATOR_PV88060) += pv88060-regulator.o

obj-$(CONFIG_REGULATOR_PV88080) += pv88080-regulator.o

obj-$(CONFIG_REGULATOR_PV88090) += pv88090-regulator.o

obj-$(CONFIG_REGULATOR_PWM) += pwm-regulator.o

obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o

drivers/regulator/pv88080-regulator.c

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/*

 * pv88080-regulator.c - Regulator device driver for PV88080

 * Copyright (C) 2016  Powerventure Semiconductor Ltd.

 *

 * 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.

 *

 * 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.

 */



#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/regmap.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <linux/regulator/of_regulator.h>

#include <linux/proc_fs.h>

#include <linux/uaccess.h>

#include "pv88080-regulator.h"



#define PV88080_MAX_REGULATORS	3



/* PV88080 REGULATOR IDs */

enum {

	/* BUCKs */

	PV88080_ID_BUCK1,

	PV88080_ID_BUCK2,

	PV88080_ID_BUCK3,

};



struct pv88080_regulator {

	struct regulator_desc desc;

	/* Current limiting */

	unsigned int n_current_limits;

	const int *current_limits;

	unsigned int limit_mask;

	unsigned int conf;

	unsigned int conf2;

	unsigned int conf5;

};



struct pv88080 {

	struct device *dev;

	struct regmap *regmap;

	struct regulator_dev *rdev[PV88080_MAX_REGULATORS];

};



struct pv88080_buck_voltage {

	int min_uV;

	int max_uV;

	int uV_step;

};



static const struct regmap_config pv88080_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

};



/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.

 * Entry indexes corresponds to register values.

 */



static const int pv88080_buck1_limits[] = {

	3230000, 5130000, 6960000, 8790000

};



static const int pv88080_buck23_limits[] = {

	1496000, 2393000, 3291000, 4189000

};



static const struct pv88080_buck_voltage pv88080_buck_vol[2] = {

	{

		.min_uV = 600000,

		.max_uV = 1393750,

		.uV_step = 6250,

	},

	{

		.min_uV = 1400000,

		.max_uV = 2193750,

		.uV_step = 6250,

	},

};



static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev)

{

	struct pv88080_regulator *info = rdev_get_drvdata(rdev);

	unsigned int data;

	int ret, mode = 0;



	ret = regmap_read(rdev->regmap, info->conf, &data);

	if (ret < 0)

		return ret;



	switch (data & PV88080_BUCK1_MODE_MASK) {

	case PV88080_BUCK_MODE_SYNC:

		mode = REGULATOR_MODE_FAST;

		break;

	case PV88080_BUCK_MODE_AUTO:

		mode = REGULATOR_MODE_NORMAL;

		break;

	case PV88080_BUCK_MODE_SLEEP:

		mode = REGULATOR_MODE_STANDBY;

		break;

	default:

		return -EINVAL;

	}



	return mode;

}



static int pv88080_buck_set_mode(struct regulator_dev *rdev,

					unsigned int mode)

{

	struct pv88080_regulator *info = rdev_get_drvdata(rdev);

	int val = 0;



	switch (mode) {

	case REGULATOR_MODE_FAST:

		val = PV88080_BUCK_MODE_SYNC;

		break;

	case REGULATOR_MODE_NORMAL:

		val = PV88080_BUCK_MODE_AUTO;

		break;

	case REGULATOR_MODE_STANDBY:

		val = PV88080_BUCK_MODE_SLEEP;

		break;

	default:

		return -EINVAL;

	}



	return regmap_update_bits(rdev->regmap, info->conf,

					PV88080_BUCK1_MODE_MASK, val);

}



static int pv88080_set_current_limit(struct regulator_dev *rdev, int min,

				    int max)

{

	struct pv88080_regulator *info = rdev_get_drvdata(rdev);

	int i;



	/* search for closest to maximum */

	for (i = info->n_current_limits; i >= 0; i--) {

		if (min <= info->current_limits[i]

			&& max >= info->current_limits[i]) {

				return regmap_update_bits(rdev->regmap,

					info->conf,

					info->limit_mask,

					i << PV88080_BUCK1_ILIM_SHIFT);

		}

	}



	return -EINVAL;

}



static int pv88080_get_current_limit(struct regulator_dev *rdev)

{

	struct pv88080_regulator *info = rdev_get_drvdata(rdev);

	unsigned int data;

	int ret;



	ret = regmap_read(rdev->regmap, info->conf, &data);

	if (ret < 0)

		return ret;



	data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT;

	return info->current_limits[data];

}



static struct regulator_ops pv88080_buck_ops = {

	.get_mode = pv88080_buck_get_mode,

	.set_mode = pv88080_buck_set_mode,

	.enable = regulator_enable_regmap,

	.disable = regulator_disable_regmap,

	.is_enabled = regulator_is_enabled_regmap,

	.set_voltage_sel = regulator_set_voltage_sel_regmap,

	.get_voltage_sel = regulator_get_voltage_sel_regmap,

	.list_voltage = regulator_list_voltage_linear,

	.set_current_limit = pv88080_set_current_limit,

	.get_current_limit = pv88080_get_current_limit,

};



#define PV88080_BUCK(chip, regl_name, min, step, max, limits_array) \

{\

	.desc	=	{\

		.id = chip##_ID_##regl_name,\

		.name = __stringify(chip##_##regl_name),\

		.of_match = of_match_ptr(#regl_name),\

		.regulators_node = of_match_ptr("regulators"),\

		.type = REGULATOR_VOLTAGE,\

		.owner = THIS_MODULE,\

		.ops = &pv88080_buck_ops,\

		.min_uV = min, \

		.uV_step = step, \

		.n_voltages = ((max) - (min))/(step) + 1, \

		.enable_reg = PV88080_REG_##regl_name##_CONF0, \

		.enable_mask = PV88080_##regl_name##_EN, \

		.vsel_reg = PV88080_REG_##regl_name##_CONF0, \

		.vsel_mask = PV88080_V##regl_name##_MASK, \

	},\

	.current_limits = limits_array, \

	.n_current_limits = ARRAY_SIZE(limits_array), \

	.limit_mask = PV88080_##regl_name##_ILIM_MASK, \

	.conf = PV88080_REG_##regl_name##_CONF1, \

	.conf2 = PV88080_REG_##regl_name##_CONF2, \

	.conf5 = PV88080_REG_##regl_name##_CONF5, \

}



static struct pv88080_regulator pv88080_regulator_info[] = {

	PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750,

		pv88080_buck1_limits),

	PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750,

		pv88080_buck23_limits),

	PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750,

		pv88080_buck23_limits),

};



static irqreturn_t pv88080_irq_handler(int irq, void *data)

{

	struct pv88080 *chip = data;

	int i, reg_val, err, ret = IRQ_NONE;



	err = regmap_read(chip->regmap, PV88080_REG_EVENT_A, &reg_val);

	if (err < 0)

		goto error_i2c;



	if (reg_val & PV88080_E_VDD_FLT) {

		for (i = 0; i < PV88080_MAX_REGULATORS; i++) {

			if (chip->rdev[i] != NULL) {

				regulator_notifier_call_chain(chip->rdev[i],

					REGULATOR_EVENT_UNDER_VOLTAGE,

					NULL);

			}

		}



		err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,

			PV88080_E_VDD_FLT);

		if (err < 0)

			goto error_i2c;



		ret = IRQ_HANDLED;

	}



	if (reg_val & PV88080_E_OVER_TEMP) {

		for (i = 0; i < PV88080_MAX_REGULATORS; i++) {

			if (chip->rdev[i] != NULL) {

				regulator_notifier_call_chain(chip->rdev[i],

					REGULATOR_EVENT_OVER_TEMP,

					NULL);

			}

		}



		err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,

			PV88080_E_OVER_TEMP);

		if (err < 0)

			goto error_i2c;



		ret = IRQ_HANDLED;

	}



	return ret;



error_i2c:

	dev_err(chip->dev, "I2C error : %d\n", err);

	return IRQ_NONE;

}



/*

 * I2C driver interface functions

 */

static int pv88080_i2c_probe(struct i2c_client *i2c,

		const struct i2c_device_id *id)

{

	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);

	struct pv88080 *chip;

	struct regulator_config config = { };

	int i, error, ret;

	unsigned int conf2, conf5;



	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), GFP_KERNEL);

	if (!chip)

		return -ENOMEM;



	chip->dev = &i2c->dev;

	chip->regmap = devm_regmap_init_i2c(i2c, &pv88080_regmap_config);

	if (IS_ERR(chip->regmap)) {

		error = PTR_ERR(chip->regmap);

		dev_err(chip->dev, "Failed to allocate register map: %d\n",

			error);

		return error;

	}



	i2c_set_clientdata(i2c, chip);



	if (i2c->irq != 0) {

		ret = regmap_write(chip->regmap, PV88080_REG_MASK_A, 0xFF);

		if (ret < 0) {

			dev_err(chip->dev,

				"Failed to mask A reg: %d\n", ret);

			return ret;

		}

		ret = regmap_write(chip->regmap, PV88080_REG_MASK_B, 0xFF);

		if (ret < 0) {

			dev_err(chip->dev,

				"Failed to mask B reg: %d\n", ret);

			return ret;

		}

		ret = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF);

		if (ret < 0) {

			dev_err(chip->dev,

				"Failed to mask C reg: %d\n", ret);

			return ret;

		}



		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,

					pv88080_irq_handler,

					IRQF_TRIGGER_LOW|IRQF_ONESHOT,

					"pv88080", chip);

		if (ret != 0) {

			dev_err(chip->dev, "Failed to request IRQ: %d\n",

				i2c->irq);

			return ret;

		}



		ret = regmap_update_bits(chip->regmap, PV88080_REG_MASK_A,

			PV88080_M_VDD_FLT | PV88080_M_OVER_TEMP, 0);

		if (ret < 0) {

			dev_err(chip->dev,

				"Failed to update mask reg: %d\n", ret);

			return ret;

		}



	} else {

		dev_warn(chip->dev, "No IRQ configured\n");

	}



	config.dev = chip->dev;

	config.regmap = chip->regmap;



	for (i = 0; i < PV88080_MAX_REGULATORS; i++) {

		if (init_data)

			config.init_data = &init_data[i];



		ret = regmap_read(chip->regmap,

			pv88080_regulator_info[i].conf2, &conf2);

		if (ret < 0)

			return ret;



		conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) &

			PV88080_BUCK_VDAC_RANGE_MASK);



		ret = regmap_read(chip->regmap,

			pv88080_regulator_info[i].conf5, &conf5);

		if (ret < 0)

			return ret;



		conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) &

			PV88080_BUCK_VRANGE_GAIN_MASK);



		pv88080_regulator_info[i].desc.min_uV =

			pv88080_buck_vol[conf2].min_uV * (conf5+1);

		pv88080_regulator_info[i].desc.uV_step =

			pv88080_buck_vol[conf2].uV_step * (conf5+1);

		pv88080_regulator_info[i].desc.n_voltages =

			((pv88080_buck_vol[conf2].max_uV * (conf5+1))

			- (pv88080_regulator_info[i].desc.min_uV))

			/(pv88080_regulator_info[i].desc.uV_step) + 1;



		config.driver_data = (void *)&pv88080_regulator_info[i];

		chip->rdev[i] = devm_regulator_register(chip->dev,

			&pv88080_regulator_info[i].desc, &config);

		if (IS_ERR(chip->rdev[i])) {

			dev_err(chip->dev,

				"Failed to register PV88080 regulator\n");

			return PTR_ERR(chip->rdev[i]);

		}

	}



	return 0;

}



static const struct i2c_device_id pv88080_i2c_id[] = {

	{"pv88080", 0},

	{},

};

MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id);



#ifdef CONFIG_OF

static const struct of_device_id pv88080_dt_ids[] = {

	{ .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] },

	{},

};

MODULE_DEVICE_TABLE(of, pv88080_dt_ids);

#endif



static struct i2c_driver pv88080_regulator_driver = {

	.driver = {

		.name = "pv88080",

		.of_match_table = of_match_ptr(pv88080_dt_ids),

	},

	.probe = pv88080_i2c_probe,

	.id_table = pv88080_i2c_id,

};



module_i2c_driver(pv88080_regulator_driver);



MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");

MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080");

MODULE_LICENSE("GPL");

drivers/regulator/pv88080-regulator.h

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/*

 * pv88080-regulator.h - Regulator definitions for PV88080

 * Copyright (C) 2016 Powerventure Semiconductor Ltd.

 *

 * 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.

 *

 * 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.

 */



#ifndef __PV88080_REGISTERS_H__

#define __PV88080_REGISTERS_H__



/* System Control and Event Registers */

#define	PV88080_REG_EVENT_A			0x04

#define	PV88080_REG_MASK_A			0x09

#define	PV88080_REG_MASK_B			0x0a

#define	PV88080_REG_MASK_C			0x0b



/* Regulator Registers */

#define	PV88080_REG_BUCK1_CONF0			0x27

#define	PV88080_REG_BUCK1_CONF1			0x28

#define	PV88080_REG_BUCK1_CONF2			0x59

#define	PV88080_REG_BUCK1_CONF5			0x5c

#define	PV88080_REG_BUCK2_CONF0			0x29

#define	PV88080_REG_BUCK2_CONF1			0x2a

#define	PV88080_REG_BUCK2_CONF2			0x61

#define	PV88080_REG_BUCK2_CONF5			0x64

#define	PV88080_REG_BUCK3_CONF0			0x2b

#define	PV88080_REG_BUCK3_CONF1			0x2c

#define	PV88080_REG_BUCK3_CONF2			0x69

#define	PV88080_REG_BUCK3_CONF5			0x6c



/* PV88080_REG_EVENT_A (addr=0x04) */

#define	PV88080_E_VDD_FLT				0x01

#define	PV88080_E_OVER_TEMP			0x02



/* PV88080_REG_MASK_A (addr=0x09) */

#define	PV88080_M_VDD_FLT				0x01

#define	PV88080_M_OVER_TEMP			0x02



/* PV88080_REG_BUCK1_CONF0 (addr=0x27) */

#define	PV88080_BUCK1_EN				0x80

#define PV88080_VBUCK1_MASK			0x7F

/* PV88080_REG_BUCK2_CONF0 (addr=0x29) */

#define	PV88080_BUCK2_EN				0x80

#define PV88080_VBUCK2_MASK			0x7F

/* PV88080_REG_BUCK3_CONF0 (addr=0x2b) */

#define	PV88080_BUCK3_EN				0x80

#define PV88080_VBUCK3_MASK			0x7F



/* PV88080_REG_BUCK1_CONF1 (addr=0x28) */

#define PV88080_BUCK1_ILIM_SHIFT			2

#define PV88080_BUCK1_ILIM_MASK			0x0C

#define PV88080_BUCK1_MODE_MASK			0x03



/* PV88080_REG_BUCK2_CONF1 (addr=0x2a) */

#define PV88080_BUCK2_ILIM_SHIFT			2

#define PV88080_BUCK2_ILIM_MASK			0x0C

#define PV88080_BUCK2_MODE_MASK			0x03



/* PV88080_REG_BUCK3_CONF1 (addr=0x2c) */

#define PV88080_BUCK3_ILIM_SHIFT			2

#define PV88080_BUCK3_ILIM_MASK			0x0C

#define PV88080_BUCK3_MODE_MASK			0x03



#define	PV88080_BUCK_MODE_SLEEP			0x00

#define	PV88080_BUCK_MODE_AUTO			0x01

#define	PV88080_BUCK_MODE_SYNC			0x02



/* PV88080_REG_BUCK2_CONF2 (addr=0x61) */

/* PV88080_REG_BUCK3_CONF2 (addr=0x69) */

#define PV88080_BUCK_VDAC_RANGE_SHIFT			7

#define PV88080_BUCK_VDAC_RANGE_MASK			0x01



#define PV88080_BUCK_VDAC_RANGE_1			0x00

#define PV88080_BUCK_VDAC_RANGE_2			0x01



/* PV88080_REG_BUCK2_CONF5 (addr=0x64) */

/* PV88080_REG_BUCK3_CONF5 (addr=0x6c) */

#define PV88080_BUCK_VRANGE_GAIN_SHIFT			0

#define PV88080_BUCK_VRANGE_GAIN_MASK			0x01



#define PV88080_BUCK_VRANGE_GAIN_1			0x00

#define PV88080_BUCK_VRANGE_GAIN_2			0x01



#endif	/* __PV88080_REGISTERS_H__ */

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