path: root/drivers/regulator/s2mps11.c

/*
 * s2mps11.c
 *
 * Copyright (c) 2012-2014 Samsung Electronics Co., Ltd
 *              http://www.samsung.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.
 *
 * 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/bug.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of_gpio.h>
#include <linux/mfd/samsung/core.h>
#include <linux/mfd/samsung/s2mps11.h>
#include <linux/mfd/samsung/s2mps13.h>
#include <linux/mfd/samsung/s2mps14.h>
#include <linux/mfd/samsung/s2mps15.h>
#include <linux/mfd/samsung/s2mpu02.h>

/* The highest number of possible regulators for supported devices. */
#define S2MPS_REGULATOR_MAX		S2MPS13_REGULATOR_MAX
struct s2mps11_info {
	int ramp_delay2;
	int ramp_delay34;
	int ramp_delay5;
	int ramp_delay16;
	int ramp_delay7810;
	int ramp_delay9;

	enum sec_device_type dev_type;

	/*
	 * One bit for each S2MPS13/S2MPS14/S2MPU02 regulator whether
	 * the suspend mode was enabled.
	 */
	DECLARE_BITMAP(suspend_state, S2MPS_REGULATOR_MAX);

	/*
	 * Array (size: number of regulators) with GPIO-s for external
	 * sleep control.
	 */
	int *ext_control_gpio;
};

static int get_ramp_delay(int ramp_delay)
{
	unsigned char cnt = 0;

	ramp_delay /= 6250;

	while (true) {
		ramp_delay = ramp_delay >> 1;
		if (ramp_delay == 0)
			break;
		cnt++;
	}

	if (cnt > 3)
		cnt = 3;

	return cnt;
}

static int s2mps11_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
				   unsigned int old_selector,
				   unsigned int new_selector)
{
	struct s2mps11_info *s2mps11 = rdev_get_drvdata(rdev);
	unsigned int ramp_delay = 0;
	int old_volt, new_volt;

	switch (rdev_get_id(rdev)) {
	case S2MPS11_BUCK2:
		ramp_delay = s2mps11->ramp_delay2;
		break;
	case S2MPS11_BUCK3:
	case S2MPS11_BUCK4:
		ramp_delay = s2mps11->ramp_delay34;
		break;
	case S2MPS11_BUCK5:
		ramp_delay = s2mps11->ramp_delay5;
		break;
	case S2MPS11_BUCK6:
	case S2MPS11_BUCK1:
		ramp_delay = s2mps11->ramp_delay16;
		break;
	case S2MPS11_BUCK7:
	case S2MPS11_BUCK8:
	case S2MPS11_BUCK10:
		ramp_delay = s2mps11->ramp_delay7810;
		break;
	case S2MPS11_BUCK9:
		ramp_delay = s2mps11->ramp_delay9;
	}

	if (ramp_delay == 0)
		ramp_delay = rdev->desc->ramp_delay;

	old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
	new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);

	return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
}

static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
	struct s2mps11_info *s2mps11 = rdev_get_drvdata(rdev);
	unsigned int ramp_val, ramp_shift, ramp_reg = S2MPS11_REG_RAMP_BUCK;
	unsigned int ramp_enable = 1, enable_shift = 0;
	int ret;

	switch (rdev_get_id(rdev)) {
	case S2MPS11_BUCK1:
		if (ramp_delay > s2mps11->ramp_delay16)
			s2mps11->ramp_delay16 = ramp_delay;
		else
			ramp_delay = s2mps11->ramp_delay16;

		ramp_shift = S2MPS11_BUCK16_RAMP_SHIFT;
		break;
	case S2MPS11_BUCK2:
		enable_shift = S2MPS11_BUCK2_RAMP_EN_SHIFT;