path: root/drivers/regulator/wm8350-regulator.c

/*
 * wm8350.c  --  Voltage and current regulation for the Wolfson WM8350 PMIC
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood
 *         linux@wolfsonmicro.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/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/pmic.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>

/* Maximum value possible for VSEL */
#define WM8350_DCDC_MAX_VSEL 0x66

/* Microamps */
static const int isink_cur[] = {
	4,
	5,
	6,
	7,
	8,
	10,
	11,
	14,
	16,
	19,
	23,
	27,
	32,
	39,
	46,
	54,
	65,
	77,
	92,
	109,
	130,
	154,
	183,
	218,
	259,
	308,
	367,
	436,
	518,
	616,
	733,
	872,
	1037,
	1233,
	1466,
	1744,
	2073,
	2466,
	2933,
	3487,
	4147,
	4932,
	5865,
	6975,
	8294,
	9864,
	11730,
	13949,
	16589,
	19728,
	23460,
	27899,
	33178,
	39455,
	46920,
	55798,
	66355,
	78910,
	93840,
	111596,
	132710,
	157820,
	187681,
	223191
};

static int get_isink_val(int min_uA, int max_uA, u16 *setting)
{
	int i;

	for (i = ARRAY_SIZE(isink_cur) - 1; i >= 0; i--) {
		if (min_uA <= isink_cur[i] && max_uA >= isink_cur[i]) {
			*setting = i;
			return 0;
		}
	}
	return -EINVAL;
}

static inline int wm8350_ldo_val_to_mvolts(unsigned int val)
{
	if (val < 16)
		return (val * 50) + 900;
	else
		return ((val - 16) * 100) + 1800;

}

static inline unsigned int wm8350_ldo_mvolts_to_val(int mV)
{
	if (mV < 1800)
		return (mV - 900) / 50;
	else
		return ((mV - 1800) / 100) + 16;
}

static inline int wm8350_dcdc_val_to_mvolts(unsigned int val)
{
	return (val * 25) + 850;
}

static inline unsigned int wm8350_dcdc_mvolts_to_val(int mV)
{
	return (mV - 850) / 25;
}

static int wm8350_isink_set_current(struct regulator_dev *rdev, int min_uA,
	int max_uA)
{
	struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
	int isink = rdev_get_id(rdev);
	u16 val, setting;
	int ret;

	ret = get_isink_val(min_uA, max_uA, &setting);
	if (ret != 0)
		return ret;

	switch (isink) {
	case WM8350_ISINK_A:
		val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_A) &
		    ~WM8350_CS1_ISEL_MASK;
		wm8350_reg_write(wm8350, WM8350_CURRENT_SINK_DRIVER_A,
				 val | setting);
		break;
	case WM8350_ISINK_B:
		val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_B) &
		    ~WM8350_CS1_ISEL_MASK;
		wm8350_reg_write(wm8350, WM8350_CURRENT_SINK_DRIVER_B,
				 val | setting);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int wm8350_isink_get_current(struct regulator_dev *rdev)
{
	struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
	int isink = rdev_get_id(rdev);
	u16 val;

	switch (isink) {
	case WM8350_ISINK_A:
		val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_A) &
		    WM8350_CS1_ISEL_MASK;
		break;
	case WM8350_ISINK_B:
		val = wm8350_reg_read(wm8350, WM8350_CURRENT_SINK_DRIVER_B) &
		    WM8350_CS1_ISEL_MASK;
		break;
	default:
		return 0;
	}

	return (isink_cur[val] + 50) / 100;
}

/* turn on ISINK followed by DCDC */
static int wm8350_isink_enable(struct regulator_dev *rdev)
{
	struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
	int isink = rdev_get_id(rdev);

	switch (isink) {
	case WM8350_ISINK_A:
		switch (wm8350->pmic.isink_A_dcdc) {
		case WM8350_DCDC_2:
		case WM8350_DCDC_5:
			wm8350_set_bits(wm8350, WM8350_POWER_MGMT_7,
					WM8350_CS1_ENA);
			wm8350_set_bits(wm8350, WM8350_CSA_FLASH_CONTROL,
					WM8350_CS1_DRIVE);
			wm8350_set_bits(wm8350, WM8350_DCDC_LDO_REQUESTED,
					1 << (wm8350->pmic.isink_A_dcdc -
					      WM8350_DCDC_1));
			break;
		default:
			return -EINVAL;
		}