Date:	Wed, 13 Apr 2011 17:42:08 +0530
From:	Ashish Jangam <Ashish.Jangam@...tcummins.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"lrg@...mlogic.co.uk" <lrg@...mlogic.co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Dajun Chen <Dajun.Chen@...semi.com>
Subject: [PATCHv1 5/11] REGULATOR: Regulator module of DA9052 PMIC driver

Hi Mark,

Regulator Driver for Dialog Semiconductor DA9052 PMICs.

Changes made since last submission:
. Change the regulator registration method
. Ported the driver to Linux kernel 2.6.38.2 

Linux Kernel Version: 2.6.38.2

Signed-off-by: D. Chen <dchen@...semi.com>
---
diff -Naur linux-2.6.38.2/drivers/regulator/da9052-regulator.c wrk_linux-2.6.38.2/drivers/regulator/da9052-regulator.c
--- linux-2.6.38.2/drivers/regulator/da9052-regulator.c	1970-01-01 05:00:00.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/regulator/da9052-regulator.c	2011-04-13 13:04:03.000000000 +0500
@@ -0,0 +1,431 @@
+/*
+* Regulator driver for DA9052
+*
+* Copyright(c) 2009 Dialog Semiconductor Ltd.
+*
+*Author: Dajun Chen <dchen@...semi.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/moduleparam.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/pdata.h>
+#include <linux/mfd/da9052/reg.h>
+
+/* LDO and Buck index */
+#define DA9052_BUCK_CORE	0
+#define DA9052_BUCK_PRO	1
+#define DA9052_BUCK_MEM	2
+#define DA9052_BUCK_PERI	3
+
+#define DA9052_LDO2		5
+#define DA9052_LDO3		6
+
+/* Buck step size Macros */
+#define DA9052_BUCK_PERI_3uV_STEP		100000
+#define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV	24
+#define DA9052_CONST_3uV			3000000
+
+static struct regulator_ops da9052_regulator_ops;
+
+static struct regulator_consumer_supply da9052_vddarm_consumers[] = {
+	{
+		.supply = "vcc",
+	}
+};
+
+#define DA9052_BUCKCORE_INIT(max, min) \
+{\
+	.constraints = {\
+		.max_uV		= (max) * 1000,\
+		.min_uV		= (min) * 1000,\
+		.valid_ops_mask	= REGULATOR_CHANGE_VOLTAGE\
+		|REGULATOR_CHANGE_STATUS | REGULATOR_CHANGE_MODE,\
+		.valid_modes_mask = REGULATOR_MODE_NORMAL,\
+	},\
+	.num_consumer_supplies = ARRAY_SIZE(da9052_vddarm_consumers),\
+	.consumer_supplies = da9052_vddarm_consumers,\
+}
+
+
+#define DA9052_REGULATOR_INIT(max, min) \
+{\
+	.constraints = {\
+		.max_uV		= (max) * 1000,\
+		.min_uV		= (min) * 1000,\
+		.valid_ops_mask	= REGULATOR_CHANGE_VOLTAGE\
+		|REGULATOR_CHANGE_STATUS | REGULATOR_CHANGE_MODE,\
+		.valid_modes_mask = REGULATOR_MODE_NORMAL,\
+	},\
+}
+
+struct regulator_init_data da9052_regulators_init[] = {
+	/* BUCKS */
+	DA9052_BUCKCORE_INIT(2075, 500),
+	DA9052_REGULATOR_INIT(2075, 500),
+	DA9052_REGULATOR_INIT(2500, 925),
+	DA9052_REGULATOR_INIT(3600, 1800),
+	/* LDO */
+	DA9052_REGULATOR_INIT(1800, 600),
+	DA9052_REGULATOR_INIT(1800, 600),
+	DA9052_REGULATOR_INIT(3300, 1725),
+	DA9052_REGULATOR_INIT(3300, 1725),
+	DA9052_REGULATOR_INIT(3600, 1200),
+	DA9052_REGULATOR_INIT(3600, 1200),
+	DA9052_REGULATOR_INIT(3600, 1200),
+	DA9052_REGULATOR_INIT(3600, 1200),
+	DA9052_REGULATOR_INIT(3650, 1250),
+	DA9052_REGULATOR_INIT(3600, 1200),
+
+};
+
+#define DA9052_LDO(_id, step, sbits, ebits, mbits) \
+{\
+		.reg_desc	= {\
+		.name		= "LDO" #_id,\
+		.ops		= &da9052_regulator_ops,\
+		.type		= REGULATOR_VOLTAGE,\
+		.id		= _id,\
+		.owner		= THIS_MODULE,\
+	},\
+		.step_uV		= (step) * 1000,\
+		.volt_shift		= (sbits),\
+		.enable_bit		= (ebits),\
+		.supply_v_mask	= (mbits),\
+}
+
+#define DA9052_DCDC(_id, step, sbits, ebits, mbits) \
+{\
+		.reg_desc	= {\
+		.name		= "BUCK" #_id,\
+		.ops		= &da9052_regulator_ops,\
+		.type		= REGULATOR_VOLTAGE,\
+		.id		= _id,\
+		.owner		= THIS_MODULE,\
+	},\
+		.step_uV		= (step) * 1000,\
+		.volt_shift		= (sbits),\
+		.enable_bit		= (ebits),\
+		.supply_v_mask	= (mbits),\
+}
+
+struct da9052_regulator_info {
+	struct regulator_desc reg_desc;
+	int step_uV;
+	unsigned char volt_shift;
+	unsigned char enable_bit;
+	unsigned char supply_v_mask;
+
+};
+
+struct da9052_regulator {
+	struct da9052 *da9052;
+	struct regulator_dev *regulators[];
+};
+
+struct da9052_regulator_info da9052_regulator_info[] = {
+	/* Buck1 - 4*/
+	DA9052_DCDC(0, 25, 6, 6, DA9052_SUPPLY_VBCOREGO),
+	DA9052_DCDC(1, 25, 6, 6, DA9052_SUPPLY_VBPROGO),
+	DA9052_DCDC(2, 25, 6, 6, DA9052_SUPPLY_VBMEMGO),
+	DA9052_DCDC(3, 50, 5, 6, 0),
+	/* LD01 - LDO10*/
+	DA9052_LDO(4, 50, 5, 6, 0),
+	DA9052_LDO(5, 25, 6, 6, DA9052_SUPPLY_VLDO2GO),
+	DA9052_LDO(6, 25, 6, 6, DA9052_SUPPLY_VLDO3GO),
+	DA9052_LDO(7, 25, 6, 6, 0),
+	DA9052_LDO(8, 50, 6, 6, 0),
+	DA9052_LDO(9, 50, 6, 6, 0),
+	DA9052_LDO(10, 50, 6, 6, 0),
+	DA9052_LDO(11, 50, 6, 6, 0),
+	DA9052_LDO(12, 50, 6, 6, 0),
+	DA9052_LDO(13, 50, 6, 6, 0),
+};
+
+static inline struct da9052 *to_da9052(struct regulator_dev *rdev)
+{
+	return dev_get_drvdata(rdev_get_dev(rdev)->parent->parent);
+
+}
+
+static int da9052_regulator_uvolts_to_regVal(struct regulator_dev *rdev,
+						unsigned int val)
+{
+	struct regulation_constraints *constraints = rdev->constraints;
+	int offset = rdev_get_id(rdev);
+	int reg_val = 0;
+
+	/* Care for the varying step size of BUCK PERI */
+	if ((offset == DA9052_BUCK_PERI) && (val >= DA9052_CONST_3uV)) {
+		reg_val = (DA9052_CONST_3uV - constraints->min_uV)/
+				  (da9052_regulator_info[offset].step_uV);
+		reg_val += ((val - DA9052_CONST_3uV) /
+					(DA9052_BUCK_PERI_3uV_STEP));
+	} else{
+		reg_val = (val - constraints->min_uV)/
+				  (da9052_regulator_info[offset].step_uV);
+
+		/* Validate reg_val */
+		if ((reg_val * da9052_regulator_info[offset].step_uV) +
+			constraints->min_uV > constraints->max_uV)
+			return -EINVAL;
+	}
+
+	return reg_val;
+
+}
+
+static int da9052_regulator_val_to_uvolts(struct regulator_dev *rdev,
+						unsigned int regval)
+{
+	struct regulation_constraints *constraints = rdev->constraints;
+	int offset = rdev_get_id(rdev);
+	int regval_uV = 0;
+
+	if (offset == DA9052_BUCK_PERI) {
+		if (regval >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV) {
+			regval_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV *
+				da9052_regulator_info[offset].step_uV)
+				+ constraints->min_uV);
+			regval_uV += (regval -
+				DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
+				*(DA9052_BUCK_PERI_3uV_STEP);
+		} else {
+			regval_uV =
+				(regval * da9052_regulator_info[offset].step_uV)
+				+ constraints->min_uV;
+		}
+	} else {
+		regval_uV = (regval * da9052_regulator_info[offset].step_uV) +
+				constraints->min_uV;
+	}
+
+	return regval_uV;
+}
+
+static int da9052_regulator_enable(struct regulator_dev *rdev)
+{
+	struct da9052_regulator_info *info = rdev_get_drvdata(rdev);
+	struct da9052 *da9052 = to_da9052(rdev);
+	int offset = rdev_get_id(rdev);
+	int ret;
+
+	ret = da9052_reg_update(da9052, DA9052_BUCKCORE_REG + offset,
+				1 << info->enable_bit, 1 << info->enable_bit);
+	if (ret < 0)
+		return -EIO;
+
+	return 0;
+}
+
+static int da9052_regulator_disable(struct regulator_dev *rdev)
+{
+	struct da9052_regulator_info *info = rdev_get_drvdata(rdev);
+	struct da9052 *da9052 = to_da9052(rdev);
+	int offset = rdev_get_id(rdev);
+	int ret = 0;
+
+	ret = da9052_reg_update(da9052, DA9052_BUCKCORE_REG + offset,
+					1 << info->enable_bit, 0);
+	if (ret < 0)
+		return -EIO;
+
+	return 0;
+}
+
+static int da9052_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	struct da9052 *da9052 = to_da9052(rdev);
+	int offset = rdev_get_id(rdev);
+	int ret;
+
+	ret = da9052_reg_read(da9052, DA9052_BUCKCORE_REG + offset);
+
+	if (ret < 0)
+		return -EIO;
+
+	return ret & (1 << da9052_regulator_info[offset].enable_bit);
+
+}
+
+static int da9052_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
+				 int max_uV, unsigned *selector)
+{
+	struct da9052 *da9052 = to_da9052(rdev);
+	int offset = rdev_get_id(rdev);
+	int ret;
+	int reg_val = 0;
+
+	reg_val = da9052_regulator_uvolts_to_regVal(rdev, min_uV);
+
+	ret = da9052_reg_update(da9052, DA9052_BUCKCORE_REG + offset,
+			(1 << da9052_regulator_info[offset].volt_shift) - 1,
+			reg_val);
+	if (ret < 0)
+		return -EIO;
+
+	/* Set the GO LDO/BUCk bits so that the voltage changes */
+	if (da9052_regulator_info[offset].supply_v_mask != 0) {
+		ret = da9052_reg_update(da9052, DA9052_SUPPLY_REG, 0,
+				da9052_regulator_info[offset].supply_v_mask);
+		if (ret < 0)
+			return -EIO;
+	}
+
+	return ret;
+}
+
+static int da9052_regulator_get_voltage(struct regulator_dev *rdev)
+{
+	struct da9052 *da9052 = to_da9052(rdev);
+	int offset = rdev_get_id(rdev);
+	int ret;
+
+	ret = da9052_reg_read(da9052, DA9052_BUCKCORE_REG + offset);
+	if (ret < 0)
+		return -EIO;
+
+	return da9052_regulator_val_to_uvolts(rdev,
+		ret &
+		((1 << da9052_regulator_info[offset].volt_shift) - 1));
+}
+
+static int da9052_list_voltage(struct regulator_dev *rdev, unsigned selector)
+{
+	struct regulation_constraints *constraints = rdev->constraints;
+	struct da9052_regulator_info *info = rdev_get_drvdata(rdev);
+	int ret;
+
+	ret = constraints->min_uV + info->step_uV * selector;
+	if (ret > constraints->max_uV)
+		return -EINVAL;
+
+	return ret;
+}
+
+static struct regulator_ops da9052_regulator_ops = {
+	.is_enabled	 = da9052_regulator_is_enabled,
+	.enable		 = da9052_regulator_enable,
+	.disable	 = da9052_regulator_disable,
+	.get_voltage	 = da9052_regulator_get_voltage,
+	.set_voltage	 = da9052_regulator_set_voltage,
+	.list_voltage	= da9052_list_voltage,
+};
+
+static int __remove_subdev(struct device *dev, void *unused)
+{
+	platform_device_unregister(to_platform_device(dev));
+	return 0;
+}
+
+
+void da9052_add_regulator_devices(struct da9052 *da9052,
+				struct da9052_pdata *pdata)
+{
+	struct platform_device *pdev;
+	int i, ret = 0;
+
+	for (i = 0; i < pdata->num_subdevs; i++) {
+
+		pdev = platform_device_alloc("da9052-regulator", i);
+		if (!pdev) {
+			ret = -ENOMEM;
+			goto failed;
+		}
+		pdev->dev.parent = da9052->dev;
+		ret = platform_device_add(pdev);
+		if (ret) {
+			platform_device_put(pdev);
+			goto failed;
+		}
+	}
+	return;
+
+failed:
+	device_for_each_child(da9052->dev, NULL, __remove_subdev);
+	return;
+}
+EXPORT_SYMBOL(da9052_add_regulator_devices);
+
+
+static inline struct da9052_regulator_info *find_regulator_info(int id)
+{
+	struct da9052_regulator_info *ri;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
+		ri = &da9052_regulator_info[i];
+		if (ri->reg_desc.id == id)
+			return ri;
+	}
+	return NULL;
+}
+
+static int __devinit da9052_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_dev *rdev;
+	struct da9052_regulator_info *ri = NULL;
+
+	ri = find_regulator_info(pdev->id);
+	if (ri == NULL) {
+		dev_err(&pdev->dev, "invalid regulator ID specified\n");
+		return -EINVAL;
+	}
+
+	rdev = regulator_register(&ri->reg_desc, &pdev->dev,
+				  pdev->dev.platform_data, ri);
+	if (IS_ERR(rdev)) {
+		dev_err(&pdev->dev, "failed to register regulator %s\n",
+				ri->reg_desc.name);
+		return PTR_ERR(rdev);
+	}
+
+	platform_set_drvdata(pdev, rdev);
+
+	return 0;
+
+}
+
+static int __devexit da9052_regulator_remove(struct platform_device *pdev)
+{
+	struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+	regulator_unregister(rdev);
+	return 0;
+}
+
+static struct platform_driver da9052_regulator_driver = {
+	.driver.name	= "da9052-regulator",
+	.driver.owner	= THIS_MODULE,
+	.probe		= da9052_regulator_probe,
+	.remove		= __devexit_p(da9052_regulator_remove),
+};
+
+static int __init da9052_regulator_init(void)
+{
+	return platform_driver_register(&da9052_regulator_driver);
+}
+subsys_initcall(da9052_regulator_init);
+
+static void __exit da9052_regulator_exit(void)
+{
+	platform_driver_unregister(&da9052_regulator_driver);
+}
+module_exit(da9052_regulator_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
+MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
diff -Naur linux-2.6.38.2/drivers/regulator/Kconfig wrk_linux-2.6.38.2/drivers/regulator/Kconfig
--- linux-2.6.38.2/drivers/regulator/Kconfig	2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/regulator/Kconfig	2011-04-13 13:04:34.000000000 +0500
@@ -158,6 +158,13 @@
 	  Say y here to support the BUCKs and LDOs regulators found on
 	  Dialog Semiconductor DA9030/DA9034 PMIC.

+config REGULATOR_DA9052
+	tristate "Dialog DA9052 regulators"
+	depends on PMIC_DA9052
+	help
+	  Say y here to support the BUCKs and LDOs regulators found on
+	  Dialog Semiconductor DA9052 PMIC.
+
 config REGULATOR_PCF50633
 	tristate "PCF50633 regulator driver"
         depends on MFD_PCF50633
diff -Naur linux-2.6.38.2/drivers/regulator/Makefile wrk_linux-2.6.38.2/drivers/regulator/Makefile
--- linux-2.6.38.2/drivers/regulator/Makefile	2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/regulator/Makefile	2011-04-13 13:04:27.000000000 +0500
@@ -27,6 +27,7 @@
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o
 obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o
+obj-$(CONFIG_REGULATOR_DA9052)  += da9052-regulator.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o

Regards,
Ashish J

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