[deliverable/linux.git] / drivers / regulator / tps62360-regulator.c

/*
 * tps62360.c -- TI tps62360
 *
 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
 *
 * Copyright (c) 2012, NVIDIA Corporation.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; 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., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307, USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/regulator/of_regulator.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/tps62360.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>

/* Register definitions */
#define REG_VSET0		0
#define REG_VSET1		1
#define REG_VSET2		2
#define REG_VSET3		3
#define REG_CONTROL		4
#define REG_TEMP		5
#define REG_RAMPCTRL		6
#define REG_CHIPID		8

#define FORCE_PWM_ENABLE	BIT(7)

enum chips {TPS62360, TPS62361, TPS62362, TPS62363};

#define TPS62360_BASE_VOLTAGE	770000
#define TPS62360_N_VOLTAGES	64

#define TPS62361_BASE_VOLTAGE	500000
#define TPS62361_N_VOLTAGES	128

/* tps 62360 chip information */
struct tps62360_chip {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regmap *regmap;
	int chip_id;
	int vsel0_gpio;
	int vsel1_gpio;
	int voltage_base;
	u8 voltage_reg_mask;
	bool en_internal_pulldn;
	bool en_discharge;
	bool valid_gpios;
	int lru_index[4];
	int curr_vset_vsel[4];
	int curr_vset_id;
	int change_uv_per_us;
};

/*
 * find_voltage_set_register: Find new voltage configuration register
 * (VSET) id.
 * The finding of the new VSET register will be based on the LRU mechanism.
 * Each VSET register will have different voltage configured . This
 * Function will look if any of the VSET register have requested voltage set
 * or not.
 *     - If it is already there then it will make that register as most
 *       recently used and return as found so that caller need not to set
 *       the VSET register but need to set the proper gpios to select this
 *       VSET register.
 *     - If requested voltage is not found then it will use the least
 *       recently mechanism to get new VSET register for new configuration
 *       and will return not_found so that caller need to set new VSET
 *       register and then gpios (both).
 */
static bool find_voltage_set_register(struct tps62360_chip *tps,
		int req_vsel, int *vset_reg_id)
{
	int i;
	bool found = false;
	int new_vset_reg = tps->lru_index[3];
	int found_index = 3;

	for (i = 0; i < 4; ++i) {
		if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
			new_vset_reg = tps->lru_index[i];
			found_index = i;
			found = true;
			goto update_lru_index;
		}
	}

update_lru_index:
	for (i = found_index; i > 0; i--)
		tps->lru_index[i] = tps->lru_index[i - 1];

	tps->lru_index[0] = new_vset_reg;
	*vset_reg_id = new_vset_reg;
	return found;
}

static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
{
	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	int vsel;
	unsigned int data;
	int ret;

	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	if (ret < 0) {
		dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
			__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}
	vsel = (int)data & tps->voltage_reg_mask;
	return vsel;
}

static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
					 unsigned selector)
{
	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	int ret;
	bool found = false;
	int new_vset_id = tps->curr_vset_id;

	/*
	 * If gpios are available to select the VSET register then least
	 * recently used register for new configuration.
	 */
	if (tps->valid_gpios)
		found = find_voltage_set_register(tps, selector, &new_vset_id);

	if (!found) {
		ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
				tps->voltage_reg_mask, selector);
		if (ret < 0) {
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				 __func__, REG_VSET0 + new_vset_id, ret);
			return ret;
		}
		tps->curr_vset_id = new_vset_id;
		tps->curr_vset_vsel[new_vset_id] = selector;
	}

	/* Select proper VSET register vio gpios */
	if (tps->valid_gpios) {
		gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
		gpio_set_value_cansleep(tps->vsel1_gpio,
					(new_vset_id >> 1) & 0x1);
	}
	return 0;
}

static int tps62360_set_voltage_time_sel(struct regulator_dev *rdev,
		unsigned int old_selector, unsigned int new_selector)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	int old_uV, new_uV;

	old_uV = regulator_list_voltage_linear(rdev, old_selector);
	if (old_uV < 0)
		return old_uV;

	new_uV = regulator_list_voltage_linear(rdev, new_selector);
	if (new_uV < 0)
		return new_uV;

	return DIV_ROUND_UP(abs(old_uV - new_uV), tps->change_uv_per_us);
}

static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	int i;
	int val;
	int ret;

	/* Enable force PWM mode in FAST mode only. */
	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = FORCE_PWM_ENABLE;
		break;

	case REGULATOR_MODE_NORMAL:
		val = 0;
		break;

	default:
		return -EINVAL;
	}

	if (!tps->valid_gpios) {
		ret = regmap_update_bits(tps->regmap,
			REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
		if (ret < 0)
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}

	/* If gpios are valid then all register set need to be control */
	for (i = 0; i < 4; ++i) {
		ret = regmap_update_bits(tps->regmap,
					REG_VSET0 + i, FORCE_PWM_ENABLE, val);
		if (ret < 0) {
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				__func__, REG_VSET0 + i, ret);
			return ret;
		}
	}
	return ret;
}

static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret;

	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	if (ret < 0) {
		dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
			__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}
	return (data & FORCE_PWM_ENABLE) ?
				REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}

static struct regulator_ops tps62360_dcdc_ops = {
	.get_voltage_sel	= tps62360_dcdc_get_voltage_sel,
	.set_voltage_sel	= tps62360_dcdc_set_voltage_sel,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.set_voltage_time_sel	= tps62360_set_voltage_time_sel,
	.set_mode		= tps62360_set_mode,
	.get_mode		= tps62360_get_mode,
};

static int __devinit tps62360_init_dcdc(struct tps62360_chip *tps,
		struct tps62360_regulator_platform_data *pdata)
{
	int ret;
	unsigned int ramp_ctrl;

	/* Initialize internal pull up/down control */
	if (tps->en_internal_pulldn)
		ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
	else
		ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d write failed with err %d\n",
			__func__, REG_CONTROL, ret);
		return ret;
	}

	/* Reset output discharge path to reduce power consumption */
	ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d update failed with err %d\n",
			__func__, REG_RAMPCTRL, ret);
		return ret;
	}

	/* Get ramp value from ramp control register */
	ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d read failed with err %d\n",
			__func__, REG_RAMPCTRL, ret);
		return ret;
	}
	ramp_ctrl = (ramp_ctrl >> 4) & 0x7;

	/* ramp mV/us = 32/(2^ramp_ctrl) */
	tps->change_uv_per_us = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
	return ret;
}

static const struct regmap_config tps62360_regmap_config = {
	.reg_bits		= 8,
	.val_bits		= 8,
	.max_register		= REG_CHIPID,
	.cache_type		= REGCACHE_RBTREE,
};

static struct tps62360_regulator_platform_data *
	of_get_tps62360_platform_data(struct device *dev)
{
	struct tps62360_regulator_platform_data *pdata;
	struct device_node *np = dev->of_node;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		dev_err(dev, "Memory alloc failed for platform data\n");
		return NULL;
	}

	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
	if (!pdata->reg_init_data) {
		dev_err(dev, "Not able to get OF regulator init data\n");
		return NULL;
	}

	pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
	pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);

	if (of_find_property(np, "ti,vsel0-state-high", NULL))
		pdata->vsel0_def_state = 1;

	if (of_find_property(np, "ti,vsel1-state-high", NULL))
		pdata->vsel1_def_state = 1;

	if (of_find_property(np, "ti,enable-pull-down", NULL))
		pdata->en_internal_pulldn = true;

	if (of_find_property(np, "ti,enable-vout-discharge", NULL))
		pdata->en_discharge = true;

	return pdata;
}

#if defined(CONFIG_OF)
static const struct of_device_id tps62360_of_match[] = {
	 { .compatible = "ti,tps62360", .data = (void *)TPS62360},
	 { .compatible = "ti,tps62361", .data = (void *)TPS62361},
	 { .compatible = "ti,tps62362", .data = (void *)TPS62362},
	 { .compatible = "ti,tps62363", .data = (void *)TPS62363},
	{},
};
MODULE_DEVICE_TABLE(of, tps62360_of_match);
#endif

static int __devinit tps62360_probe(struct i2c_client *client,
				     const struct i2c_device_id *id)
{
	struct regulator_config config = { };
	struct tps62360_regulator_platform_data *pdata;
	struct regulator_dev *rdev;
	struct tps62360_chip *tps;
	int ret;
	int i;
	int chip_id;

	pdata = client->dev.platform_data;
	chip_id = id->driver_data;

	if (client->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_device(of_match_ptr(tps62360_of_match),
				&client->dev);
		if (!match) {
			dev_err(&client->dev, "Error: No device match found\n");
			return -ENODEV;
		}
		chip_id = (int)match->data;
		if (!pdata)
			pdata = of_get_tps62360_platform_data(&client->dev);
	}

	if (!pdata) {
		dev_err(&client->dev, "%s(): Platform data not found\n",
						__func__);
		return -EIO;
	}

	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	if (!tps) {
		dev_err(&client->dev, "%s(): Memory allocation failed\n",
						__func__);
		return -ENOMEM;
	}

	tps->en_discharge = pdata->en_discharge;
	tps->en_internal_pulldn = pdata->en_internal_pulldn;
	tps->vsel0_gpio = pdata->vsel0_gpio;
	tps->vsel1_gpio = pdata->vsel1_gpio;
	tps->dev = &client->dev;

	switch (chip_id) {
	case TPS62360:
	case TPS62362:
		tps->voltage_base = TPS62360_BASE_VOLTAGE;
		tps->voltage_reg_mask = 0x3F;
		tps->desc.n_voltages = TPS62360_N_VOLTAGES;
		break;
	case TPS62361:
	case TPS62363:
		tps->voltage_base = TPS62361_BASE_VOLTAGE;
		tps->voltage_reg_mask = 0x7F;
		tps->desc.n_voltages = TPS62361_N_VOLTAGES;
		break;
	default:
		return -ENODEV;
	}

	tps->desc.name = id->name;
	tps->desc.id = 0;
	tps->desc.ops = &tps62360_dcdc_ops;
	tps->desc.type = REGULATOR_VOLTAGE;
	tps->desc.owner = THIS_MODULE;
	tps->desc.min_uV = tps->voltage_base;
	tps->desc.uV_step = 10000;

	tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
	if (IS_ERR(tps->regmap)) {
		ret = PTR_ERR(tps->regmap);
		dev_err(&client->dev,
			"%s(): regmap allocation failed with err %d\n",
			__func__, ret);
		return ret;
	}
	i2c_set_clientdata(client, tps);

	tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
				(pdata->vsel0_def_state & 1);
	tps->lru_index[0] = tps->curr_vset_id;
	tps->valid_gpios = false;

	if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
		int gpio_flags;
		gpio_flags = (pdata->vsel0_def_state) ?
				GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
		ret = gpio_request_one(tps->vsel0_gpio,
				gpio_flags, "tps62360-vsel0");
		if (ret) {
			dev_err(&client->dev,
				"%s(): Could not obtain vsel0 GPIO %d: %d\n",
				__func__, tps->vsel0_gpio, ret);
			goto err_gpio0;
		}

		gpio_flags = (pdata->vsel1_def_state) ?
				GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
		ret = gpio_request_one(tps->vsel1_gpio,
				gpio_flags, "tps62360-vsel1");
		if (ret) {
			dev_err(&client->dev,
				"%s(): Could not obtain vsel1 GPIO %d: %d\n",
				__func__, tps->vsel1_gpio, ret);
			goto err_gpio1;
		}
		tps->valid_gpios = true;

		/*
		 * Initialize the lru index with vset_reg id
		 * The index 0 will be most recently used and
		 * set with the tps->curr_vset_id */
		for (i = 0; i < 4; ++i)
			tps->lru_index[i] = i;
		tps->lru_index[0] = tps->curr_vset_id;
		tps->lru_index[tps->curr_vset_id] = 0;
	}

	ret = tps62360_init_dcdc(tps, pdata);
	if (ret < 0) {
		dev_err(tps->dev, "%s(): Init failed with err = %d\n",
				__func__, ret);
		goto err_init;
	}

	config.dev = &client->dev;
	config.init_data = pdata->reg_init_data;
	config.driver_data = tps;

	/* Register the regulators */
	rdev = regulator_register(&tps->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(tps->dev,
			"%s(): regulator register failed with err %s\n",
			__func__, id->name);
		ret = PTR_ERR(rdev);
		goto err_init;
	}

	tps->rdev = rdev;
	return 0;

err_init:
	if (gpio_is_valid(tps->vsel1_gpio))
		gpio_free(tps->vsel1_gpio);
err_gpio1:
	if (gpio_is_valid(tps->vsel0_gpio))
		gpio_free(tps->vsel0_gpio);
err_gpio0:
	return ret;
}

/**
 * tps62360_remove - tps62360 driver i2c remove handler
 * @client: i2c driver client device structure
 *
 * Unregister TPS driver as an i2c client device driver
 */
static int __devexit tps62360_remove(struct i2c_client *client)
{
	struct tps62360_chip *tps = i2c_get_clientdata(client);

	if (gpio_is_valid(tps->vsel1_gpio))
		gpio_free(tps->vsel1_gpio);

	if (gpio_is_valid(tps->vsel0_gpio))
		gpio_free(tps->vsel0_gpio);

	regulator_unregister(tps->rdev);
	return 0;
}

static void tps62360_shutdown(struct i2c_client *client)
{
	struct tps62360_chip *tps = i2c_get_clientdata(client);
	int st;

	if (!tps->en_discharge)
		return;

	/* Configure the output discharge path */
	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
	if (st < 0)
		dev_err(tps->dev,
			"%s(): register %d update failed with err %d\n",
			__func__, REG_RAMPCTRL, st);
}

static const struct i2c_device_id tps62360_id[] = {
	{.name = "tps62360", .driver_data = TPS62360},
	{.name = "tps62361", .driver_data = TPS62361},
	{.name = "tps62362", .driver_data = TPS62362},
	{.name = "tps62363", .driver_data = TPS62363},
	{},
};

MODULE_DEVICE_TABLE(i2c, tps62360_id);

static struct i2c_driver tps62360_i2c_driver = {
	.driver = {
		.name = "tps62360",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(tps62360_of_match),
	},
	.probe = tps62360_probe,
	.remove = __devexit_p(tps62360_remove),
	.shutdown = tps62360_shutdown,
	.id_table = tps62360_id,
};

static int __init tps62360_init(void)
{
	return i2c_add_driver(&tps62360_i2c_driver);
}
subsys_initcall(tps62360_init);

static void __exit tps62360_cleanup(void)
{
	i2c_del_driver(&tps62360_i2c_driver);
}
module_exit(tps62360_cleanup);

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
6219929f LD	1	/*
	2	* tps62360.c -- TI tps62360
	3	*
d1cf4f65	4	* Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
6219929f LD	5	*
	6	* Copyright (c) 2012, NVIDIA Corporation.
	7	*
	8	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation version 2.
	13	*
	14	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	15	* whether express or implied; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	22	* 02111-1307, USA
	23	*/
	24
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/init.h>
	28	#include <linux/err.h>
684ae39b LD	29	#include <linux/of.h>
	30	#include <linux/of_device.h>
	31	#include <linux/of_gpio.h>
	32	#include <linux/regulator/of_regulator.h>
6219929f LD	33	#include <linux/platform_device.h>
	34	#include <linux/regulator/driver.h>
	35	#include <linux/regulator/machine.h>
	36	#include <linux/regulator/tps62360.h>
	37	#include <linux/gpio.h>
	38	#include <linux/i2c.h>
6219929f LD	39	#include <linux/slab.h>
	40	#include <linux/regmap.h>
	41
	42	/* Register definitions */
	43	#define REG_VSET0 0
	44	#define REG_VSET1 1
	45	#define REG_VSET2 2
	46	#define REG_VSET3 3
	47	#define REG_CONTROL 4
	48	#define REG_TEMP 5
	49	#define REG_RAMPCTRL 6
	50	#define REG_CHIPID 8
	51
9a00630c LD	52	#define FORCE_PWM_ENABLE BIT(7)
9a00630c LD	53
d1cf4f65	54	enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
6219929f	55
2935fb18	56	#define TPS62360_BASE_VOLTAGE 770000
6219929f LD	57	#define TPS62360_N_VOLTAGES 64
6219929f LD	58
2935fb18	59	#define TPS62361_BASE_VOLTAGE 500000
6219929f LD	60	#define TPS62361_N_VOLTAGES 128
	61
	62	/* tps 62360 chip information */
	63	struct tps62360_chip {
6219929f LD	64	struct device *dev;
6219929f LD	65	struct regulator_desc desc;
6219929f LD	66	struct regulator_dev *rdev;
	67	struct regmap *regmap;
	68	int chip_id;
	69	int vsel0_gpio;
	70	int vsel1_gpio;
	71	int voltage_base;
	72	u8 voltage_reg_mask;
	73	bool en_internal_pulldn;
6219929f LD	74	bool en_discharge;
	75	bool valid_gpios;
	76	int lru_index[4];
	77	int curr_vset_vsel[4];
	78	int curr_vset_id;
a60cfce0	79	int change_uv_per_us;
6219929f LD	80	};
	81
	82	/*
	83	* find_voltage_set_register: Find new voltage configuration register
	84	* (VSET) id.
	85	* The finding of the new VSET register will be based on the LRU mechanism.
	86	* Each VSET register will have different voltage configured . This
	87	* Function will look if any of the VSET register have requested voltage set
	88	* or not.
	89	* - If it is already there then it will make that register as most
	90	* recently used and return as found so that caller need not to set
	91	* the VSET register but need to set the proper gpios to select this
	92	* VSET register.
	93	* - If requested voltage is not found then it will use the least
	94	* recently mechanism to get new VSET register for new configuration
	95	* and will return not_found so that caller need to set new VSET
	96	* register and then gpios (both).
	97	*/
	98	static bool find_voltage_set_register(struct tps62360_chip *tps,
	99	int req_vsel, int *vset_reg_id)
	100	{
	101	int i;
	102	bool found = false;
	103	int new_vset_reg = tps->lru_index[3];
	104	int found_index = 3;
2935fb18	105
6219929f LD	106	for (i = 0; i < 4; ++i) {
	107	if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
	108	new_vset_reg = tps->lru_index[i];
	109	found_index = i;
	110	found = true;
	111	goto update_lru_index;
	112	}
	113	}
	114
	115	update_lru_index:
	116	for (i = found_index; i > 0; i--)
	117	tps->lru_index[i] = tps->lru_index[i - 1];
	118
	119	tps->lru_index[0] = new_vset_reg;
	120	*vset_reg_id = new_vset_reg;
	121	return found;
	122	}
	123
a60cfce0	124	static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
6219929f LD	125	{
	126	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	127	int vsel;
	128	unsigned int data;
	129	int ret;
	130
	131	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	132	if (ret < 0) {
2935fb18 LD	133	dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
2935fb18 LD	134	__func__, REG_VSET0 + tps->curr_vset_id, ret);
6219929f LD	135	return ret;
	136	}
	137	vsel = (int)data & tps->voltage_reg_mask;
a60cfce0	138	return vsel;
6219929f LD	139	}
6219929f LD	140
41097afd AL	141	static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
41097afd AL	142	unsigned selector)
6219929f LD	143	{
6219929f LD	144	struct tps62360_chip *tps = rdev_get_drvdata(dev);
6219929f LD	145	int ret;
	146	bool found = false;
	147	int new_vset_id = tps->curr_vset_id;
	148
6219929f LD	149	/*
	150	* If gpios are available to select the VSET register then least
	151	* recently used register for new configuration.
	152	*/
	153	if (tps->valid_gpios)
41097afd	154	found = find_voltage_set_register(tps, selector, &new_vset_id);
6219929f LD	155
	156	if (!found) {
	157	ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
41097afd	158	tps->voltage_reg_mask, selector);
6219929f	159	if (ret < 0) {
2935fb18 LD	160	dev_err(tps->dev,
	161	"%s(): register %d update failed with err %d\n",
	162	__func__, REG_VSET0 + new_vset_id, ret);
6219929f LD	163	return ret;
	164	}
	165	tps->curr_vset_id = new_vset_id;
41097afd	166	tps->curr_vset_vsel[new_vset_id] = selector;
6219929f LD	167	}
	168
	169	/* Select proper VSET register vio gpios */
	170	if (tps->valid_gpios) {
2935fb18	171	gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
6219929f LD	172	gpio_set_value_cansleep(tps->vsel1_gpio,
	173	(new_vset_id >> 1) & 0x1);
	174	}
	175	return 0;
	176	}
	177
a60cfce0 LD	178	static int tps62360_set_voltage_time_sel(struct regulator_dev *rdev,
	179	unsigned int old_selector, unsigned int new_selector)
	180	{
	181	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	182	int old_uV, new_uV;
	183
7f225ba5	184	old_uV = regulator_list_voltage_linear(rdev, old_selector);
a60cfce0 LD	185	if (old_uV < 0)
	186	return old_uV;
	187
7f225ba5	188	new_uV = regulator_list_voltage_linear(rdev, new_selector);
a60cfce0 LD	189	if (new_uV < 0)
	190	return new_uV;
	191
	192	return DIV_ROUND_UP(abs(old_uV - new_uV), tps->change_uv_per_us);
	193	}
	194
9a00630c LD	195	static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
	196	{
	197	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	198	int i;
	199	int val;
	200	int ret;
	201
	202	/* Enable force PWM mode in FAST mode only. */
	203	switch (mode) {
	204	case REGULATOR_MODE_FAST:
	205	val = FORCE_PWM_ENABLE;
	206	break;
	207
	208	case REGULATOR_MODE_NORMAL:
	209	val = 0;
	210	break;
	211
	212	default:
	213	return -EINVAL;
	214	}
	215
	216	if (!tps->valid_gpios) {
	217	ret = regmap_update_bits(tps->regmap,
	218	REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
	219	if (ret < 0)
	220	dev_err(tps->dev,
	221	"%s(): register %d update failed with err %d\n",
	222	__func__, REG_VSET0 + tps->curr_vset_id, ret);
	223	return ret;
	224	}
	225
	226	/* If gpios are valid then all register set need to be control */
	227	for (i = 0; i < 4; ++i) {
	228	ret = regmap_update_bits(tps->regmap,
	229	REG_VSET0 + i, FORCE_PWM_ENABLE, val);
	230	if (ret < 0) {
	231	dev_err(tps->dev,
	232	"%s(): register %d update failed with err %d\n",
	233	__func__, REG_VSET0 + i, ret);
	234	return ret;
	235	}
	236	}
	237	return ret;
	238	}
	239
	240	static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
	241	{
	242	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	243	unsigned int data;
	244	int ret;
	245
	246	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	247	if (ret < 0) {
	248	dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
	249	__func__, REG_VSET0 + tps->curr_vset_id, ret);
	250	return ret;
	251	}
	252	return (data & FORCE_PWM_ENABLE) ?
	253	REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
	254	}
	255
6219929f	256	static struct regulator_ops tps62360_dcdc_ops = {
a60cfce0	257	.get_voltage_sel = tps62360_dcdc_get_voltage_sel,
41097afd	258	.set_voltage_sel = tps62360_dcdc_set_voltage_sel,
7f225ba5	259	.list_voltage = regulator_list_voltage_linear,
41097afd	260	.map_voltage = regulator_map_voltage_linear,
a60cfce0	261	.set_voltage_time_sel = tps62360_set_voltage_time_sel,
9a00630c LD	262	.set_mode = tps62360_set_mode,
9a00630c LD	263	.get_mode = tps62360_get_mode,
6219929f LD	264	};
6219929f LD	265
2935fb18	266	static int __devinit tps62360_init_dcdc(struct tps62360_chip *tps,
6219929f LD	267	struct tps62360_regulator_platform_data *pdata)
	268	{
	269	int ret;
a60cfce0	270	unsigned int ramp_ctrl;
6219929f	271
2935fb18	272	/* Initialize internal pull up/down control */
6219929f LD	273	if (tps->en_internal_pulldn)
	274	ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
	275	else
	276	ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
	277	if (ret < 0) {
2935fb18 LD	278	dev_err(tps->dev,
	279	"%s(): register %d write failed with err %d\n",
	280	__func__, REG_CONTROL, ret);
6219929f LD	281	return ret;
	282	}
	283
6219929f LD	284	/* Reset output discharge path to reduce power consumption */
6219929f LD	285	ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
a60cfce0	286	if (ret < 0) {
2935fb18 LD	287	dev_err(tps->dev,
	288	"%s(): register %d update failed with err %d\n",
	289	__func__, REG_RAMPCTRL, ret);
a60cfce0 LD	290	return ret;
	291	}
	292
	293	/* Get ramp value from ramp control register */
	294	ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
	295	if (ret < 0) {
2935fb18 LD	296	dev_err(tps->dev,
	297	"%s(): register %d read failed with err %d\n",
	298	__func__, REG_RAMPCTRL, ret);
a60cfce0 LD	299	return ret;
	300	}
	301	ramp_ctrl = (ramp_ctrl >> 4) & 0x7;
	302
	303	/* ramp mV/us = 32/(2^ramp_ctrl) */
	304	tps->change_uv_per_us = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
6219929f LD	305	return ret;
	306	}
	307
	308	static const struct regmap_config tps62360_regmap_config = {
16ea003b LD	309	.reg_bits = 8,
	310	.val_bits = 8,
	311	.max_register = REG_CHIPID,
	312	.cache_type = REGCACHE_RBTREE,
6219929f LD	313	};
6219929f LD	314
684ae39b LD	315	static struct tps62360_regulator_platform_data *
	316	of_get_tps62360_platform_data(struct device *dev)
	317	{
	318	struct tps62360_regulator_platform_data *pdata;
	319	struct device_node *np = dev->of_node;
	320
	321	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	322	if (!pdata) {
	323	dev_err(dev, "Memory alloc failed for platform data\n");
	324	return NULL;
	325	}
	326
	327	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
	328	if (!pdata->reg_init_data) {
	329	dev_err(dev, "Not able to get OF regulator init data\n");
	330	return NULL;
	331	}
	332
	333	pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
	334	pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
	335
	336	if (of_find_property(np, "ti,vsel0-state-high", NULL))
	337	pdata->vsel0_def_state = 1;
	338
	339	if (of_find_property(np, "ti,vsel1-state-high", NULL))
	340	pdata->vsel1_def_state = 1;
	341
	342	if (of_find_property(np, "ti,enable-pull-down", NULL))
	343	pdata->en_internal_pulldn = true;
	344
684ae39b LD	345	if (of_find_property(np, "ti,enable-vout-discharge", NULL))
	346	pdata->en_discharge = true;
	347
	348	return pdata;
	349	}
	350
	351	#if defined(CONFIG_OF)
	352	static const struct of_device_id tps62360_of_match[] = {
	353	{ .compatible = "ti,tps62360", .data = (void *)TPS62360},
	354	{ .compatible = "ti,tps62361", .data = (void *)TPS62361},
	355	{ .compatible = "ti,tps62362", .data = (void *)TPS62362},
	356	{ .compatible = "ti,tps62363", .data = (void *)TPS62363},
	357	{},
be15411d	358	};
684ae39b LD	359	MODULE_DEVICE_TABLE(of, tps62360_of_match);
	360	#endif
	361
6219929f LD	362	static int __devinit tps62360_probe(struct i2c_client *client,
	363	const struct i2c_device_id *id)
	364	{
c172708d	365	struct regulator_config config = { };
6219929f LD	366	struct tps62360_regulator_platform_data *pdata;
	367	struct regulator_dev *rdev;
	368	struct tps62360_chip *tps;
	369	int ret;
	370	int i;
684ae39b	371	int chip_id;
6219929f LD	372
6219929f LD	373	pdata = client->dev.platform_data;
684ae39b LD	374	chip_id = id->driver_data;
	375
	376	if (client->dev.of_node) {
	377	const struct of_device_id *match;
	378	match = of_match_device(of_match_ptr(tps62360_of_match),
	379	&client->dev);
	380	if (!match) {
	381	dev_err(&client->dev, "Error: No device match found\n");
	382	return -ENODEV;
	383	}
	384	chip_id = (int)match->data;
	385	if (!pdata)
	386	pdata = of_get_tps62360_platform_data(&client->dev);
	387	}
	388
6219929f	389	if (!pdata) {
2935fb18	390	dev_err(&client->dev, "%s(): Platform data not found\n",
6219929f LD	391	__func__);
	392	return -EIO;
	393	}
	394
	395	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	396	if (!tps) {
2935fb18	397	dev_err(&client->dev, "%s(): Memory allocation failed\n",
6219929f LD	398	__func__);
	399	return -ENOMEM;
	400	}
	401
6219929f LD	402	tps->en_discharge = pdata->en_discharge;
	403	tps->en_internal_pulldn = pdata->en_internal_pulldn;
	404	tps->vsel0_gpio = pdata->vsel0_gpio;
	405	tps->vsel1_gpio = pdata->vsel1_gpio;
6219929f	406	tps->dev = &client->dev;
d1cf4f65	407
684ae39b	408	switch (chip_id) {
d1cf4f65 AL	409	case TPS62360:
	410	case TPS62362:
	411	tps->voltage_base = TPS62360_BASE_VOLTAGE;
	412	tps->voltage_reg_mask = 0x3F;
	413	tps->desc.n_voltages = TPS62360_N_VOLTAGES;
	414	break;
	415	case TPS62361:
	416	case TPS62363:
	417	tps->voltage_base = TPS62361_BASE_VOLTAGE;
	418	tps->voltage_reg_mask = 0x7F;
	419	tps->desc.n_voltages = TPS62361_N_VOLTAGES;
	420	break;
	421	default:
	422	return -ENODEV;
	423	}
6219929f LD	424
	425	tps->desc.name = id->name;
	426	tps->desc.id = 0;
6219929f LD	427	tps->desc.ops = &tps62360_dcdc_ops;
	428	tps->desc.type = REGULATOR_VOLTAGE;
	429	tps->desc.owner = THIS_MODULE;
7f225ba5 AL	430	tps->desc.min_uV = tps->voltage_base;
	431	tps->desc.uV_step = 10000;
	432
9a4bdd87	433	tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
6219929f LD	434	if (IS_ERR(tps->regmap)) {
6219929f LD	435	ret = PTR_ERR(tps->regmap);
2935fb18 LD	436	dev_err(&client->dev,
	437	"%s(): regmap allocation failed with err %d\n",
	438	__func__, ret);
6219929f LD	439	return ret;
	440	}
	441	i2c_set_clientdata(client, tps);
	442
	443	tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
	444	(pdata->vsel0_def_state & 1);
	445	tps->lru_index[0] = tps->curr_vset_id;
	446	tps->valid_gpios = false;
	447
	448	if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
2935fb18 LD	449	int gpio_flags;
	450	gpio_flags = (pdata->vsel0_def_state) ?
	451	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
	452	ret = gpio_request_one(tps->vsel0_gpio,
	453	gpio_flags, "tps62360-vsel0");
6219929f LD	454	if (ret) {
6219929f LD	455	dev_err(&client->dev,
2935fb18 LD	456	"%s(): Could not obtain vsel0 GPIO %d: %d\n",
2935fb18 LD	457	__func__, tps->vsel0_gpio, ret);
6219929f LD	458	goto err_gpio0;
	459	}
	460
2935fb18 LD	461	gpio_flags = (pdata->vsel1_def_state) ?
	462	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
	463	ret = gpio_request_one(tps->vsel1_gpio,
	464	gpio_flags, "tps62360-vsel1");
6219929f LD	465	if (ret) {
6219929f LD	466	dev_err(&client->dev,
2935fb18 LD	467	"%s(): Could not obtain vsel1 GPIO %d: %d\n",
2935fb18 LD	468	__func__, tps->vsel1_gpio, ret);
6219929f LD	469	goto err_gpio1;
	470	}
	471	tps->valid_gpios = true;
	472
	473	/*
	474	* Initialize the lru index with vset_reg id
	475	* The index 0 will be most recently used and
	476	* set with the tps->curr_vset_id */
	477	for (i = 0; i < 4; ++i)
	478	tps->lru_index[i] = i;
	479	tps->lru_index[0] = tps->curr_vset_id;
	480	tps->lru_index[tps->curr_vset_id] = 0;
	481	}
	482
	483	ret = tps62360_init_dcdc(tps, pdata);
	484	if (ret < 0) {
2935fb18	485	dev_err(tps->dev, "%s(): Init failed with err = %d\n",
6219929f LD	486	__func__, ret);
	487	goto err_init;
	488	}
	489
c172708d	490	config.dev = &client->dev;
8bdca009	491	config.init_data = pdata->reg_init_data;
c172708d MB	492	config.driver_data = tps;
c172708d MB	493
6219929f	494	/* Register the regulators */
c172708d	495	rdev = regulator_register(&tps->desc, &config);
6219929f	496	if (IS_ERR(rdev)) {
2935fb18 LD	497	dev_err(tps->dev,
	498	"%s(): regulator register failed with err %s\n",
	499	__func__, id->name);
6219929f LD	500	ret = PTR_ERR(rdev);
	501	goto err_init;
	502	}
	503
	504	tps->rdev = rdev;
	505	return 0;
	506
	507	err_init:
	508	if (gpio_is_valid(tps->vsel1_gpio))
	509	gpio_free(tps->vsel1_gpio);
	510	err_gpio1:
	511	if (gpio_is_valid(tps->vsel0_gpio))
	512	gpio_free(tps->vsel0_gpio);
	513	err_gpio0:
6219929f LD	514	return ret;
	515	}
	516
	517	/**
	518	* tps62360_remove - tps62360 driver i2c remove handler
	519	* @client: i2c driver client device structure
	520	*
	521	* Unregister TPS driver as an i2c client device driver
	522	*/
	523	static int __devexit tps62360_remove(struct i2c_client *client)
	524	{
	525	struct tps62360_chip *tps = i2c_get_clientdata(client);
	526
	527	if (gpio_is_valid(tps->vsel1_gpio))
	528	gpio_free(tps->vsel1_gpio);
	529
	530	if (gpio_is_valid(tps->vsel0_gpio))
	531	gpio_free(tps->vsel0_gpio);
	532
	533	regulator_unregister(tps->rdev);
6219929f LD	534	return 0;
	535	}
	536
	537	static void tps62360_shutdown(struct i2c_client *client)
	538	{
	539	struct tps62360_chip *tps = i2c_get_clientdata(client);
	540	int st;
	541
	542	if (!tps->en_discharge)
	543	return;
	544
	545	/* Configure the output discharge path */
	546	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
	547	if (st < 0)
2935fb18 LD	548	dev_err(tps->dev,
	549	"%s(): register %d update failed with err %d\n",
	550	__func__, REG_RAMPCTRL, st);
6219929f LD	551	}
	552
	553	static const struct i2c_device_id tps62360_id[] = {
	554	{.name = "tps62360", .driver_data = TPS62360},
	555	{.name = "tps62361", .driver_data = TPS62361},
d1cf4f65 AL	556	{.name = "tps62362", .driver_data = TPS62362},
d1cf4f65 AL	557	{.name = "tps62363", .driver_data = TPS62363},
6219929f LD	558	{},
	559	};
	560
	561	MODULE_DEVICE_TABLE(i2c, tps62360_id);
	562
	563	static struct i2c_driver tps62360_i2c_driver = {
	564	.driver = {
	565	.name = "tps62360",
	566	.owner = THIS_MODULE,
684ae39b	567	.of_match_table = of_match_ptr(tps62360_of_match),
6219929f LD	568	},
	569	.probe = tps62360_probe,
	570	.remove = __devexit_p(tps62360_remove),
	571	.shutdown = tps62360_shutdown,
	572	.id_table = tps62360_id,
	573	};
	574
	575	static int __init tps62360_init(void)
	576	{
	577	return i2c_add_driver(&tps62360_i2c_driver);
	578	}
	579	subsys_initcall(tps62360_init);
	580
	581	static void __exit tps62360_cleanup(void)
	582	{
	583	i2c_del_driver(&tps62360_i2c_driver);
	584	}
	585	module_exit(tps62360_cleanup);
	586
	587	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
d1cf4f65	588	MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
6219929f	589	MODULE_LICENSE("GPL v2");