Commit 39b1772a authored by Daniel Ribeiro's avatar Daniel Ribeiro Committed by Samuel Ortiz
Browse files

regulator: add pcap driver 



Add (partial) support for the voltage regulators on the PCAP2 PMIC.

Signed-off-by: default avatarDaniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent b75ea16a

drivers/regulator/Kconfig

+7 −0
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@@ -117,4 +117,11 @@ config REGULATOR_LP3971 
	 Say Y here to support the voltage regulators and convertors

	 on National Semiconductors LP3971 PMIC



config REGULATOR_PCAP

	tristate "PCAP2 regulator driver"

	depends on EZX_PCAP

	help

	 This driver provides support for the voltage regulators of the

	 PCAP2 PMIC.



endif

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -16,5 +16,6 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o 
obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o

obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o

obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o

obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o



ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/pcap-regulator.c

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+318 −0
Original line number Diff line number Diff line 
/*

 * PCAP2 Regulator Driver

 *

 * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.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/kernel.h>

#include <linux/module.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/ezx-pcap.h>



static const u16 V1_table[] = {

	2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275,

};



static const u16 V2_table[] = {

	2500, 2775,

};



static const u16 V3_table[] = {

	1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275,

};



static const u16 V4_table[] = {

	1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775,

};



static const u16 V5_table[] = {

	1875, 2275, 2475, 2775,

};



static const u16 V6_table[] = {

	2475, 2775,

};



static const u16 V7_table[] = {

	1875, 2775,

};



#define V8_table V4_table



static const u16 V9_table[] = {

	1575, 1875, 2475, 2775,

};



static const u16 V10_table[] = {

	5000,

};



static const u16 VAUX1_table[] = {

	1875, 2475, 2775, 3000,

};



#define VAUX2_table VAUX1_table



static const u16 VAUX3_table[] = {

	1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000,

	2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600,

};



static const u16 VAUX4_table[] = {

	1800, 1800, 3000, 5000,

};



static const u16 VSIM_table[] = {

	1875, 3000,

};



static const u16 VSIM2_table[] = {

	1875,

};



static const u16 VVIB_table[] = {

	1300, 1800, 2000, 3000,

};



static const u16 SW1_table[] = {

	900, 950, 1000, 1050, 1100, 1150, 1200, 1250,

	1300, 1350, 1400, 1450, 1500, 1600, 1875, 2250,

};



#define SW2_table SW1_table



static const u16 SW3_table[] = {

	4000, 4500, 5000, 5500,

};



struct pcap_regulator {

	const u8 reg;

	const u8 en;

	const u8 index;

	const u8 stby;

	const u8 lowpwr;

	const u8 n_voltages;

	const u16 *voltage_table;

};



#define NA 0xff



#define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)		\

	[_vreg]	= {							\

		.reg		= _reg,					\

		.en		= _en,					\

		.index		= _index,				\

		.stby		= _stby,				\

		.lowpwr		= _lowpwr,				\

		.n_voltages	= ARRAY_SIZE(_vreg##_table),		\

		.voltage_table	= _vreg##_table,			\

	}



static struct pcap_regulator vreg_table[] = {

	VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),

	VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),

	VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),

	VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),

	/* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */

	VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),



	VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),

	VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),

	VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),

	VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),

	VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),



	VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),

	/* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */

	VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),

	VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),

	VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),

	VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),

	VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),

	VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),



	VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),

	VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),

	/* SW3 STBY is on PCAP_REG_AUXVREG */

	VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),



	/* SWxS used to control SWx voltage on standby */

/*	VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),

	VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */

};



static int pcap_regulator_set_voltage(struct regulator_dev *rdev,

						int min_uV, int max_uV)

{

	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];

	void *pcap = rdev_get_drvdata(rdev);

	int uV;

	u8 i;



	/* the regulator doesn't support voltage switching */

	if (vreg->n_voltages == 1)

		return -EINVAL;



	for (i = 0; i < vreg->n_voltages; i++) {

		/* For V1 the first is not the best match */

		if (i == 0 && rdev_get_id(rdev) == V1)

			i = 1;

		else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1)

			i = 0;



		uV = vreg->voltage_table[i] * 1000;

		if (min_uV <= uV && uV <= max_uV)

			return ezx_pcap_set_bits(pcap, vreg->reg,

					(vreg->n_voltages - 1) << vreg->index,

					i << vreg->index);



		if (i == 0 && rdev_get_id(rdev) == V1)

			i = vreg->n_voltages - 1;

	}



	/* the requested voltage range is not supported by this regulator */

	return -EINVAL;

}



static int pcap_regulator_get_voltage(struct regulator_dev *rdev)

{

	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];

	void *pcap = rdev_get_drvdata(rdev);

	u32 tmp;

	int mV;



	if (vreg->n_voltages == 1)

		return vreg->voltage_table[0] * 1000;



	ezx_pcap_read(pcap, vreg->reg, &tmp);

	tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1));

	mV = vreg->voltage_table[tmp];



	return mV * 1000;

}



static int pcap_regulator_enable(struct regulator_dev *rdev)

{

	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];

	void *pcap = rdev_get_drvdata(rdev);



	if (vreg->en == NA)

		return -EINVAL;



	return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);

}



static int pcap_regulator_disable(struct regulator_dev *rdev)

{

	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];

	void *pcap = rdev_get_drvdata(rdev);



	if (vreg->en == NA)

		return -EINVAL;



	return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);

}



static int pcap_regulator_is_enabled(struct regulator_dev *rdev)

{

	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];

	void *pcap = rdev_get_drvdata(rdev);

	u32 tmp;



	if (vreg->en == NA)

		return -EINVAL;



	ezx_pcap_read(pcap, vreg->reg, &tmp);

	return (tmp >> vreg->en) & 1;

}



static int pcap_regulator_list_voltage(struct regulator_dev *rdev,

							unsigned int index)

{

	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];



	return vreg->voltage_table[index] * 1000;

}



static struct regulator_ops pcap_regulator_ops = {

	.list_voltage	= pcap_regulator_list_voltage,

	.set_voltage	= pcap_regulator_set_voltage,

	.get_voltage	= pcap_regulator_get_voltage,

	.enable		= pcap_regulator_enable,

	.disable	= pcap_regulator_disable,

	.is_enabled	= pcap_regulator_is_enabled,

};



#define VREG(_vreg)						\

	[_vreg]	= {						\

		.name		= #_vreg,			\

		.id		= _vreg,			\

		.n_voltages	= ARRAY_SIZE(_vreg##_table),	\

		.ops		= &pcap_regulator_ops,		\

		.type		= REGULATOR_VOLTAGE,		\

		.owner		= THIS_MODULE,			\

	}



static struct regulator_desc pcap_regulators[] = {

	VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),

	VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),

	VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),

};



static int __devinit pcap_regulator_probe(struct platform_device *pdev)

{

	struct regulator_dev *rdev;

	void *pcap = platform_get_drvdata(pdev);



	rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev,

				pdev->dev.platform_data, pcap);

	if (IS_ERR(rdev))

		return PTR_ERR(rdev);



	platform_set_drvdata(pdev, rdev);



	return 0;

}



static int __devexit pcap_regulator_remove(struct platform_device *pdev)

{

	struct regulator_dev *rdev = platform_get_drvdata(pdev);



	regulator_unregister(rdev);



	return 0;

}



static struct platform_driver pcap_regulator_driver = {

	.driver = {

		.name = "pcap-regulator",

	},

	.probe = pcap_regulator_probe,

	.remove = __devexit_p(pcap_regulator_remove),

};



static int __init pcap_regulator_init(void)

{

	return platform_driver_register(&pcap_regulator_driver);

}



static void __exit pcap_regulator_exit(void)

{

	platform_driver_unregister(&pcap_regulator_driver);

}



module_init(pcap_regulator_init);

module_exit(pcap_regulator_exit);



MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");

MODULE_DESCRIPTION("PCAP2 Regulator Driver");

MODULE_LICENSE("GPL");