regulator: lp8755: new driver for LP8755 (b59320cc) · Commits · 戴 / test

drivers/regulator/Kconfig

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Original line number	Diff line number	Diff line
		@@ -277,6 +277,15 @@ config REGULATOR_LP872X
		help
		This driver supports LP8720/LP8725 PMIC

		config REGULATOR_LP8755
		tristate "TI LP8755 High Performance PMU driver"
		depends on I2C
		select REGMAP_I2C
		help
		This driver supports LP8755 High Performance PMU driver. This
		chip contains six step-down DC/DC converters which can support
		9 mode multiphase configuration.

		config REGULATOR_LP8788
		bool "TI LP8788 Power Regulators"
		depends on MFD_LP8788

drivers/regulator/Makefile

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Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
		obj-$(CONFIG_REGULATOR_LP872X) += lp872x.o
		obj-$(CONFIG_REGULATOR_LP8788) += lp8788-buck.o
		obj-$(CONFIG_REGULATOR_LP8788) += lp8788-ldo.o
		obj-$(CONFIG_REGULATOR_LP8755) += lp8755.o
		obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
		obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
		obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o

drivers/regulator/lp8755.c

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Original line number	Diff line number	Diff line
		/*
		* LP8755 High Performance Power Management Unit : System Interface Driver
		* (based on rev. 0.26)
		* Copyright 2012 Texas Instruments
		*
		* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		*/

		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/i2c.h>
		#include <linux/err.h>
		#include <linux/irq.h>
		#include <linux/interrupt.h>
		#include <linux/gpio.h>
		#include <linux/regmap.h>
		#include <linux/delay.h>
		#include <linux/uaccess.h>
		#include <linux/regulator/driver.h>
		#include <linux/regulator/machine.h>
		#include <linux/platform_data/lp8755.h>

		#define LP8755_REG_BUCK0 0x00
		#define LP8755_REG_BUCK1 0x03
		#define LP8755_REG_BUCK2 0x04
		#define LP8755_REG_BUCK3 0x01
		#define LP8755_REG_BUCK4 0x05
		#define LP8755_REG_BUCK5 0x02
		#define LP8755_REG_MAX 0xFF

		#define LP8755_BUCK_EN_M BIT(7)
		#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
		#define LP8755_BUCK_VOUT_M 0x7F

		enum bucks {
		BUCK0 = 0,
		BUCK1,
		BUCK2,
		BUCK3,
		BUCK4,
		BUCK5,
		};

		struct lp8755_mphase {
		int nreg;
		int buck_num[LP8755_BUCK_MAX];
		};

		struct lp8755_chip {
		struct device *dev;
		struct regmap *regmap;
		struct lp8755_platform_data *pdata;

		int irq;
		unsigned int irqmask;

		int mphase;
		struct regulator_dev *rdev[LP8755_BUCK_MAX];
		};

		/**
		*lp8755_read : read a single register value from lp8755.
		*@pchip : device to read from
		*@reg : register to read from
		*@val : pointer to store read value
		*/
		static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
		unsigned int *val)
		{
		return regmap_read(pchip->regmap, reg, val);
		}

		/**
		*lp8755_write : write a single register value to lp8755.
		*@pchip : device to write to
		*@reg : register to write to
		*@val : value to be written
		*/
		static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
		unsigned int val)
		{
		return regmap_write(pchip->regmap, reg, val);
		}

		/**
		*lp8755_update_bits : set the values of bit fields in lp8755 register.
		*@pchip : device to read from
		*@reg : register to update
		*@mask : bitmask to be changed
		*@val : value for bitmask
		*/
		static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
		unsigned int mask, unsigned int val)
		{
		return regmap_update_bits(pchip->regmap, reg, mask, val);
		}

		static int lp8755_buck_enable_time(struct regulator_dev *rdev)
		{
		int ret;
		unsigned int regval;
		enum lp8755_bucks id = rdev_get_id(rdev);
		struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

		ret = lp8755_read(pchip, 0x12 + id, &regval);
		if (ret < 0) {
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return ret;
		}
		return (regval & 0xff) * 100;
		}

		static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
		{
		int ret;
		unsigned int regbval = 0x0;
		enum lp8755_bucks id = rdev_get_id(rdev);
		struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

		switch (mode) {
		case REGULATOR_MODE_FAST:
		/* forced pwm mode */
		regbval = (0x01 << id);
		break;
		case REGULATOR_MODE_NORMAL:
		/* enable automatic pwm/pfm mode */
		ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
		if (ret < 0)
		goto err_i2c;
		break;
		case REGULATOR_MODE_IDLE:
		/* enable automatic pwm/pfm/lppfm mode */
		ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
		if (ret < 0)
		goto err_i2c;

		ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
		if (ret < 0)
		goto err_i2c;
		break;
		default:
		dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
		/* forced pwm mode */
		regbval = (0x01 << id);
		}

		ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
		if (ret < 0)
		goto err_i2c;
		return ret;
		err_i2c:
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return ret;
		}

		static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
		{
		int ret;
		unsigned int regval;
		enum lp8755_bucks id = rdev_get_id(rdev);
		struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

		ret = lp8755_read(pchip, 0x06, &regval);
		if (ret < 0)
		goto err_i2c;

		/* mode fast means forced pwm mode */
		if (regval & (0x01 << id))
		return REGULATOR_MODE_FAST;

		ret = lp8755_read(pchip, 0x08 + id, &regval);
		if (ret < 0)
		goto err_i2c;

		/* mode idle means automatic pwm/pfm/lppfm mode */
		if (regval & 0x20)
		return REGULATOR_MODE_IDLE;

		/* mode normal means automatic pwm/pfm mode */
		return REGULATOR_MODE_NORMAL;

		err_i2c:
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return 0;
		}

		static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
		{
		int ret;
		unsigned int regval = 0x00;
		enum lp8755_bucks id = rdev_get_id(rdev);
		struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

		/* uV/us */
		switch (ramp) {
		case 0 ... 230:
		regval = 0x07;
		break;
		case 231 ... 470:
		regval = 0x06;
		break;
		case 471 ... 940:
		regval = 0x05;
		break;
		case 941 ... 1900:
		regval = 0x04;
		break;
		case 1901 ... 3800:
		regval = 0x03;
		break;
		case 3801 ... 7500:
		regval = 0x02;
		break;
		case 7501 ... 15000:
		regval = 0x01;
		break;
		case 15001 ... 30000:
		regval = 0x00;
		break;
		default:
		dev_err(pchip->dev,
		"Not supported ramp value %d %s\n", ramp, __func__);
		return -EINVAL;
		}

		ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
		if (ret < 0)
		goto err_i2c;
		return ret;
		err_i2c:
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return ret;
		}

		static struct regulator_ops lp8755_buck_ops = {
		.list_voltage = regulator_list_voltage_linear,
		.set_voltage_sel = regulator_set_voltage_sel_regmap,
		.get_voltage_sel = regulator_get_voltage_sel_regmap,
		.enable = regulator_enable_regmap,
		.disable = regulator_disable_regmap,
		.is_enabled = regulator_is_enabled_regmap,
		.enable_time = lp8755_buck_enable_time,
		.set_mode = lp8755_buck_set_mode,
		.get_mode = lp8755_buck_get_mode,
		.set_ramp_delay = lp8755_buck_set_ramp,
		};

		#define lp8755_rail(_id) "lp8755_buck"#_id
		#define lp8755_buck_init(_id)\
		{\
		.constraints = {\
		.name = lp8755_rail(_id),\
		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
		.min_uV = 500000,\
		.max_uV = 1675000,\
		},\
		}

		static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
		[BUCK0] = lp8755_buck_init(0),
		[BUCK1] = lp8755_buck_init(1),
		[BUCK2] = lp8755_buck_init(2),
		[BUCK3] = lp8755_buck_init(3),
		[BUCK4] = lp8755_buck_init(4),
		[BUCK5] = lp8755_buck_init(5),
		};

		static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
		{3, {BUCK0, BUCK3, BUCK5}
		},
		{6, {BUCK0, BUCK1, BUCK2, BUCK3, BUCK4, BUCK5}
		},
		{5, {BUCK0, BUCK2, BUCK3, BUCK4, BUCK5}
		},
		{4, {BUCK0, BUCK3, BUCK4, BUCK5}
		},
		{3, {BUCK0, BUCK4, BUCK5}
		},
		{2, {BUCK0, BUCK5}
		},
		{1, {BUCK0}
		},
		{2, {BUCK0, BUCK3}
		},
		{4, {BUCK0, BUCK2, BUCK3, BUCK5}
		},
		};

		static int lp8755_init_data(struct lp8755_chip *pchip)
		{
		unsigned int regval;
		int ret, icnt, buck_num;
		struct lp8755_platform_data *pdata = pchip->pdata;

		/* read back muti-phase configuration */
		ret = lp8755_read(pchip, 0x3D, &regval);
		if (ret < 0)
		goto out_i2c_error;
		pchip->mphase = regval & 0x07;

		/* set default data based on multi-phase config */
		for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
		pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
		}
		return ret;

		out_i2c_error:
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return ret;
		}

		#define lp8755_buck_desc(_id)\
		{\
		.name = lp8755_rail(_id),\
		.id = LP8755_BUCK##_id,\
		.ops = &lp8755_buck_ops,\
		.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
		.uV_step = 10000,\
		.min_uV = 500000,\
		.type = REGULATOR_VOLTAGE,\
		.owner = THIS_MODULE,\
		.enable_reg = LP8755_REG_BUCK##_id,\
		.enable_mask = LP8755_BUCK_EN_M,\
		.vsel_reg = LP8755_REG_BUCK##_id,\
		.vsel_mask = LP8755_BUCK_VOUT_M,\
		}

		static struct regulator_desc lp8755_regulators[] = {
		lp8755_buck_desc(0),
		lp8755_buck_desc(1),
		lp8755_buck_desc(2),
		lp8755_buck_desc(3),
		lp8755_buck_desc(4),
		lp8755_buck_desc(5),
		};

		static int lp8755_regulator_init(struct lp8755_chip *pchip)
		{
		int ret, icnt, buck_num;
		struct lp8755_platform_data *pdata = pchip->pdata;
		struct regulator_config rconfig = { };

		rconfig.regmap = pchip->regmap;
		rconfig.dev = pchip->dev;
		rconfig.driver_data = pchip;

		for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
		rconfig.init_data = pdata->buck_data[buck_num];
		rconfig.of_node = pchip->dev->of_node;
		pchip->rdev[buck_num] =
		regulator_register(&lp8755_regulators[buck_num], &rconfig);
		if (IS_ERR(pchip->rdev[buck_num])) {
		ret = PTR_ERR(pchip->rdev[buck_num]);
		dev_err(pchip->dev, "regulator init failed: buck 0\n");
		goto err_buck;
		}
		}

		return 0;

		err_buck:
		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		if (pchip->rdev[icnt] != NULL)
		regulator_unregister(pchip->rdev[icnt]);
		return ret;
		}

		static irqreturn_t lp8755_irq_handler(int irq, void *data)
		{
		int ret, icnt;
		unsigned int flag0, flag1;
		struct lp8755_chip *pchip = data;

		/* read flag0 register */
		ret = lp8755_read(pchip, 0x0D, &flag0);
		if (ret < 0)
		goto err_i2c;
		/* clear flag register to pull up int. pin */
		ret = lp8755_write(pchip, 0x0D, 0x00);
		if (ret < 0)
		goto err_i2c;

		/* sent power fault detection event to specific regulator */
		for (icnt = 0; icnt < 6; icnt++)
		if ((flag0 & (0x4 << icnt))
		&& (pchip->irqmask & (0x04 << icnt))
		&& (pchip->rdev[icnt] != NULL))
		regulator_notifier_call_chain(pchip->rdev[icnt],
		LP8755_EVENT_PWR_FAULT,
		NULL);

		/* read flag1 register */
		ret = lp8755_read(pchip, 0x0E, &flag1);
		if (ret < 0)
		goto err_i2c;
		/* clear flag register to pull up int. pin */
		ret = lp8755_write(pchip, 0x0E, 0x00);
		if (ret < 0)
		goto err_i2c;

		/* send OCP event to all regualtor devices */
		if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		if (pchip->rdev[icnt] != NULL)
		regulator_notifier_call_chain(pchip->rdev[icnt],
		LP8755_EVENT_OCP,
		NULL);

		/* send OVP event to all regualtor devices */
		if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		if (pchip->rdev[icnt] != NULL)
		regulator_notifier_call_chain(pchip->rdev[icnt],
		LP8755_EVENT_OVP,
		NULL);
		return IRQ_HANDLED;

		err_i2c:
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return IRQ_NONE;
		}

		static int lp8755_int_config(struct lp8755_chip *pchip)
		{
		int ret;
		unsigned int regval;

		if (pchip->irq == 0) {
		dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
		return 0;
		}

		ret = lp8755_read(pchip, 0x0F, &regval);
		if (ret < 0)
		goto err_i2c;
		pchip->irqmask = regval;
		ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
		IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
		"lp8755-irq", pchip);
		if (ret)
		return ret;

		return ret;

		err_i2c:
		dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
		return ret;
		}

		static const struct regmap_config lp8755_regmap = {
		.reg_bits = 8,
		.val_bits = 8,
		.max_register = LP8755_REG_MAX,
		};

		static int lp8755_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret, icnt;
		struct lp8755_chip *pchip;
		struct lp8755_platform_data *pdata = client->dev.platform_data;

		if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "i2c functionality check fail.\n");
		return -EOPNOTSUPP;
		}

		pchip = devm_kzalloc(&client->dev,
		sizeof(struct lp8755_chip), GFP_KERNEL);
		if (!pchip)
		return -ENOMEM;

		pchip->dev = &client->dev;
		pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
		if (IS_ERR(pchip->regmap)) {
		ret = PTR_ERR(pchip->regmap);
		dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
		return ret;
		}
		i2c_set_clientdata(client, pchip);

		if (pdata != NULL) {
		pchip->pdata = pdata;
		pchip->mphase = pdata->mphase;
		} else {
		pchip->pdata = devm_kzalloc(pchip->dev,
		sizeof(struct lp8755_platform_data),
		GFP_KERNEL);
		if (!pchip->pdata)
		return -ENOMEM;
		ret = lp8755_init_data(pchip);
		if (ret < 0)
		goto err_chip_init;
		}

		ret = lp8755_regulator_init(pchip);
		if (ret < 0)
		goto err_regulator;

		pchip->irq = client->irq;
		ret = lp8755_int_config(pchip);
		if (ret < 0)
		goto err_irq;

		return ret;

		err_irq:
		dev_err(&client->dev, "fail to irq config\n");

		for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
		regulator_unregister(pchip->rdev[icnt]);

		err_regulator:
		dev_err(&client->dev, "fail to initialize regulators\n");
		/* output disable */
		for (icnt = 0; icnt < 0x06; icnt++)
		lp8755_write(pchip, icnt, 0x00);

		err_chip_init:
		dev_err(&client->dev, "fail to initialize chip\n");
		return ret;
		}

		static int lp8755_remove(struct i2c_client *client)
		{
		int icnt;
		struct lp8755_chip *pchip = i2c_get_clientdata(client);

		for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
		regulator_unregister(pchip->rdev[icnt]);

		for (icnt = 0; icnt < 0x06; icnt++)
		lp8755_write(pchip, icnt, 0x00);

		if (pchip->irq != 0)
		free_irq(pchip->irq, pchip);

		return 0;
		}

		static const struct i2c_device_id lp8755_id[] = {
		{LP8755_NAME, 0},
		{}
		};

		MODULE_DEVICE_TABLE(i2c, lp8755_id);

		static struct i2c_driver lp8755_i2c_driver = {
		.driver = {
		.name = LP8755_NAME,
		},
		.probe = lp8755_probe,
		.remove = __devexit_p(lp8755_remove),
		.id_table = lp8755_id,
		};

		static int __init lp8755_init(void)
		{
		return i2c_add_driver(&lp8755_i2c_driver);
		}

		subsys_initcall(lp8755_init);

		static void __exit lp8755_exit(void)
		{
		i2c_del_driver(&lp8755_i2c_driver);
		}

		module_exit(lp8755_exit);

		MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
		MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
		MODULE_LICENSE("GPL v2");

include/linux/platform_data/lp8755.h

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Original line number	Diff line number	Diff line
		/*
		* LP8755 High Performance Power Management Unit Driver:System Interface Driver
		*
		* Copyright (C) 2012 Texas Instruments
		*
		* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
		* G.Shark Jeong <gshark.jeong@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		*/

		#ifndef _LP8755_H
		#define _LP8755_H

		#include <linux/regulator/consumer.h>

		#define LP8755_NAME "lp8755-regulator"
		/*
		*PWR FAULT : power fault detected
		*OCP : over current protect activated
		*OVP : over voltage protect activated
		*TEMP_WARN : thermal warning
		*TEMP_SHDN : thermal shutdonw detected
		*I_LOAD : current measured
		*/
		#define LP8755_EVENT_PWR_FAULT REGULATOR_EVENT_FAIL
		#define LP8755_EVENT_OCP REGULATOR_EVENT_OVER_CURRENT
		#define LP8755_EVENT_OVP 0x10000
		#define LP8755_EVENT_TEMP_WARN 0x2000
		#define LP8755_EVENT_TEMP_SHDN REGULATOR_EVENT_OVER_TEMP
		#define LP8755_EVENT_I_LOAD 0x40000

		enum lp8755_bucks {
		LP8755_BUCK0 = 0,
		LP8755_BUCK1,
		LP8755_BUCK2,
		LP8755_BUCK3,
		LP8755_BUCK4,
		LP8755_BUCK5,
		LP8755_BUCK_MAX,
		};

		/**
		* multiphase configuration options
		*/
		enum lp8755_mphase_config {
		MPHASE_CONF0,
		MPHASE_CONF1,
		MPHASE_CONF2,
		MPHASE_CONF3,
		MPHASE_CONF4,
		MPHASE_CONF5,
		MPHASE_CONF6,
		MPHASE_CONF7,
		MPHASE_CONF8,
		MPHASE_CONF_MAX
		};

		/**
		* struct lp8755_platform_data
		* @mphase_type : Multiphase Switcher Configurations.
		* @buck_data : buck0~6 init voltage in uV
		*/
		struct lp8755_platform_data {
		int mphase;
		struct regulator_init_data *buck_data[LP8755_BUCK_MAX];
		};
		#endif

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