<commit_before>/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * 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.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define LDO_RAMP_UP_UNIT_IN_CYCLES      64 /* 64 cycles per step */
#define LDO_RAMP_UP_FREQ_IN_MHZ         24 /* cycle based on 24M OSC */

struct anatop_regulator {
	const char *name;
	u32 control_reg;
	struct regmap *anatop;
	int vol_bit_shift;
	int vol_bit_width;
	u32 delay_reg;
	int delay_bit_shift;
	int delay_bit_width;
	int min_bit_val;
	int min_voltage;
	int max_voltage;
	struct regulator_desc rdesc;
	struct regulator_init_data *initdata;
};

static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
					unsigned selector)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	return regulator_set_voltage_sel_regmap(reg, selector);
}

static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg,
	unsigned int old_sel,
	unsigned int new_sel)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
	u32 val;
	int ret = 0;

	/* check whether need to care about LDO ramp up speed */
	if (anatop_reg->delay_bit_width && new_sel > old_sel) {
		/*
		 * the delay for LDO ramp up time is
		 * based on the register setting, we need
		 * to calculate how many steps LDO need to
		 * ramp up, and how much delay needed. (us)
		 */
		regmap_read(anatop_reg->anatop, anatop_reg->delay_reg, &val);
		val = (val >> anatop_reg->delay_bit_shift) &
			((1 << anatop_reg->delay_bit_width) - 1);
		ret = (new_sel - old_sel) * (LDO_RAMP_UP_UNIT_IN_CYCLES <<
			val) / LDO_RAMP_UP_FREQ_IN_MHZ + 1;
	}

	return ret;
}

static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	return regulator_get_voltage_sel_regmap(reg);
}

static struct regulator_ops anatop_rops = {
	.set_voltage_sel = anatop_regmap_set_voltage_sel,
	.set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
	.get_voltage_sel = anatop_regmap_get_voltage_sel,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
};

static int anatop_regulator_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct device_node *anatop_np;
	struct regulator_desc *rdesc;
	struct regulator_dev *rdev;
	struct anatop_regulator *sreg;
	struct regulator_init_data *initdata;
	struct regulator_config config = { };
	int ret = 0;

	initdata = of_get_regulator_init_data(dev, np);
	sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
	if (!sreg)
		return -ENOMEM;
	sreg->initdata = initdata;
	sreg->name = of_get_property(np, "regulator-name", NULL);
	rdesc = &sreg->rdesc;
	memset(rdesc, 0, sizeof(*rdesc));
	rdesc->name = sreg->name;
	rdesc->ops = &anatop_rops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->owner = THIS_MODULE;

	anatop_np = of_get_parent(np);
	if (!anatop_np)
		return -ENODEV;
	sreg->anatop = syscon_node_to_regmap(anatop_np);
	of_node_put(anatop_np);
	if (IS_ERR(sreg->anatop))
		return PTR_ERR(sreg->anatop);

	ret = of_property_read_u32(np, "anatop-reg-offset",
				   &sreg->control_reg);
	if (ret) {
		dev_err(dev, "no anatop-reg-offset property set\n");
		return ret;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-width",
				   &sreg->vol_bit_width);
	if (ret) {
		dev_err(dev, "no anatop-vol-bit-width property set\n");
		return ret;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-shift",
				   &sreg->vol_bit_shift);
	if (ret) {<commit_msg>regulator: anatop-regulator: Remove unneeded memset()<commit_after>/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * 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.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define LDO_RAMP_UP_UNIT_IN_CYCLES      64 /* 64 cycles per step */
#define LDO_RAMP_UP_FREQ_IN_MHZ         24 /* cycle based on 24M OSC */

struct anatop_regulator {
	const char *name;
	u32 control_reg;
	struct regmap *anatop;
	int vol_bit_shift;
	int vol_bit_width;
	u32 delay_reg;
	int delay_bit_shift;
	int delay_bit_width;
	int min_bit_val;
	int min_voltage;
	int max_voltage;
	struct regulator_desc rdesc;
	struct regulator_init_data *initdata;
};

static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
					unsigned selector)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	return regulator_set_voltage_sel_regmap(reg, selector);
}

static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg,
	unsigned int old_sel,
	unsigned int new_sel)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
	u32 val;
	int ret = 0;

	/* check whether need to care about LDO ramp up speed */
	if (anatop_reg->delay_bit_width && new_sel > old_sel) {
		/*
		 * the delay for LDO ramp up time is
		 * based on the register setting, we need
		 * to calculate how many steps LDO need to
		 * ramp up, and how much delay needed. (us)
		 */
		regmap_read(anatop_reg->anatop, anatop_reg->delay_reg, &val);
		val = (val >> anatop_reg->delay_bit_shift) &
			((1 << anatop_reg->delay_bit_width) - 1);
		ret = (new_sel - old_sel) * (LDO_RAMP_UP_UNIT_IN_CYCLES <<
			val) / LDO_RAMP_UP_FREQ_IN_MHZ + 1;
	}

	return ret;
}

static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	return regulator_get_voltage_sel_regmap(reg);
}

static struct regulator_ops anatop_rops = {
	.set_voltage_sel = anatop_regmap_set_voltage_sel,
	.set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
	.get_voltage_sel = anatop_regmap_get_voltage_sel,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
};

static int anatop_regulator_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct device_node *anatop_np;
	struct regulator_desc *rdesc;
	struct regulator_dev *rdev;
	struct anatop_regulator *sreg;
	struct regulator_init_data *initdata;
	struct regulator_config config = { };
	int ret = 0;

	initdata = of_get_regulator_init_data(dev, np);
	sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
	if (!sreg)
		return -ENOMEM;
	sreg->initdata = initdata;
	sreg->name = of_get_property(np, "regulator-name", NULL);
	rdesc = &sreg->rdesc;
	rdesc->name = sreg->name;
	rdesc->ops = &anatop_rops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->owner = THIS_MODULE;

	anatop_np = of_get_parent(np);
	if (!anatop_np)
		return -ENODEV;
	sreg->anatop = syscon_node_to_regmap(anatop_np);
	of_node_put(anatop_np);
	if (IS_ERR(sreg->anatop))
		return PTR_ERR(sreg->anatop);

	ret = of_property_read_u32(np, "anatop-reg-offset",
				   &sreg->control_reg);
	if (ret) {
		dev_err(dev, "no anatop-reg-offset property set\n");
		return ret;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-width",
				   &sreg->vol_bit_width);
	if (ret) {
		dev_err(dev, "no anatop-vol-bit-width property set\n");
		return ret;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-shift",
				   &sreg->vol_bit_shift);
	if (ret) {
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