[u-boot.git] / drivers / power / regulator / fixed.c

/*
 *  Copyright (C) 2015 Samsung Electronics
 *
 *  Przemyslaw Marczak <p.marczak@samsung.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <errno.h>
#include <dm.h>
#include <i2c.h>
#include <asm/gpio.h>
#include <power/pmic.h>
#include <power/regulator.h>

DECLARE_GLOBAL_DATA_PTR;

struct fixed_regulator_platdata {
	struct gpio_desc gpio; /* GPIO for regulator enable control */
	unsigned int startup_delay_us;
};

static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
{
	struct dm_regulator_uclass_platdata *uc_pdata;
	struct fixed_regulator_platdata *dev_pdata;
	struct gpio_desc *gpio;
	int flags = GPIOD_IS_OUT;
	int ret;

	dev_pdata = dev_get_platdata(dev);
	uc_pdata = dev_get_uclass_platdata(dev);
	if (!uc_pdata)
		return -ENXIO;

	/* Set type to fixed */
	uc_pdata->type = REGULATOR_TYPE_FIXED;

	if (dev_read_bool(dev, "enable-active-high"))
		flags |= GPIOD_IS_OUT_ACTIVE;

	/* Get fixed regulator optional enable GPIO desc */
	gpio = &dev_pdata->gpio;
	ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
	if (ret) {
		debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
		      ret);
		if (ret != -ENOENT)
			return ret;
	}

	/* Get optional ramp up delay */
	dev_pdata->startup_delay_us = dev_read_u32_default(dev,
							"startup-delay-us", 0);

	return 0;
}

static int fixed_regulator_get_value(struct udevice *dev)
{
	struct dm_regulator_uclass_platdata *uc_pdata;

	uc_pdata = dev_get_uclass_platdata(dev);
	if (!uc_pdata)
		return -ENXIO;

	if (uc_pdata->min_uV != uc_pdata->max_uV) {
		debug("Invalid constraints for: %s\n", uc_pdata->name);
		return -EINVAL;
	}

	return uc_pdata->min_uV;
}

static int fixed_regulator_get_current(struct udevice *dev)
{
	struct dm_regulator_uclass_platdata *uc_pdata;

	uc_pdata = dev_get_uclass_platdata(dev);
	if (!uc_pdata)
		return -ENXIO;

	if (uc_pdata->min_uA != uc_pdata->max_uA) {
		debug("Invalid constraints for: %s\n", uc_pdata->name);
		return -EINVAL;
	}

	return uc_pdata->min_uA;
}

static int fixed_regulator_get_enable(struct udevice *dev)
{
	struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);

	/* Enable GPIO is optional */
	if (!dev_pdata->gpio.dev)
		return true;

	return dm_gpio_get_value(&dev_pdata->gpio);
}

static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
{
	struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
	int ret;

	debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
	      dev->name, enable, dev_pdata->startup_delay_us,
	      dm_gpio_is_valid(&dev_pdata->gpio));
	/* Enable GPIO is optional */
	if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
		if (!enable)
			return -ENOSYS;
		return 0;
	}

	ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
	if (ret) {
		pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
		      enable);
		return ret;
	}

	if (enable && dev_pdata->startup_delay_us)
		udelay(dev_pdata->startup_delay_us);
	debug("%s: done\n", __func__);

	return 0;
}

static const struct dm_regulator_ops fixed_regulator_ops = {
	.get_value	= fixed_regulator_get_value,
	.get_current	= fixed_regulator_get_current,
	.get_enable	= fixed_regulator_get_enable,
	.set_enable	= fixed_regulator_set_enable,
};

static const struct udevice_id fixed_regulator_ids[] = {
	{ .compatible = "regulator-fixed" },
	{ },
};

U_BOOT_DRIVER(fixed_regulator) = {
	.name = "fixed regulator",
	.id = UCLASS_REGULATOR,
	.ops = &fixed_regulator_ops,
	.of_match = fixed_regulator_ids,
	.ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
};
Commit	Line	Data
9923a8b4 PM	1	/*
	2	* Copyright (C) 2015 Samsung Electronics
	3	*
	4	* Przemyslaw Marczak <p.marczak@samsung.com>
	5	*
	6	* SPDX-License-Identifier: GPL-2.0+
	7	*/
	8
	9	#include <common.h>
9923a8b4 PM	10	#include <errno.h>
	11	#include <dm.h>
	12	#include <i2c.h>
	13	#include <asm/gpio.h>
	14	#include <power/pmic.h>
	15	#include <power/regulator.h>
	16
	17	DECLARE_GLOBAL_DATA_PTR;
	18
	19	struct fixed_regulator_platdata {
	20	struct gpio_desc gpio; /* GPIO for regulator enable control */
7302fbb3	21	unsigned int startup_delay_us;
9923a8b4 PM	22	};
	23
	24	static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
	25	{
	26	struct dm_regulator_uclass_platdata *uc_pdata;
	27	struct fixed_regulator_platdata *dev_pdata;
	28	struct gpio_desc *gpio;
a5493f82	29	int flags = GPIOD_IS_OUT;
9923a8b4 PM	30	int ret;
	31
	32	dev_pdata = dev_get_platdata(dev);
	33	uc_pdata = dev_get_uclass_platdata(dev);
	34	if (!uc_pdata)
	35	return -ENXIO;
	36
	37	/* Set type to fixed */
	38	uc_pdata->type = REGULATOR_TYPE_FIXED;
	39
a5493f82	40	if (dev_read_bool(dev, "enable-active-high"))
bd2e9714 V	41	flags \|= GPIOD_IS_OUT_ACTIVE;
bd2e9714 V	42
dc06f63f	43	/* Get fixed regulator optional enable GPIO desc */
9923a8b4	44	gpio = &dev_pdata->gpio;
bd2e9714	45	ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
dc06f63f MZ	46	if (ret) {
	47	debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
	48	ret);
	49	if (ret != -ENOENT)
	50	return ret;
	51	}
9923a8b4	52
7302fbb3	53	/* Get optional ramp up delay */
a5493f82 SG	54	dev_pdata->startup_delay_us = dev_read_u32_default(dev,
a5493f82 SG	55	"startup-delay-us", 0);
7302fbb3	56
9923a8b4 PM	57	return 0;
	58	}
	59
	60	static int fixed_regulator_get_value(struct udevice *dev)
	61	{
	62	struct dm_regulator_uclass_platdata *uc_pdata;
	63
	64	uc_pdata = dev_get_uclass_platdata(dev);
	65	if (!uc_pdata)
	66	return -ENXIO;
	67
	68	if (uc_pdata->min_uV != uc_pdata->max_uV) {
	69	debug("Invalid constraints for: %s\n", uc_pdata->name);
	70	return -EINVAL;
	71	}
	72
	73	return uc_pdata->min_uV;
	74	}
	75
	76	static int fixed_regulator_get_current(struct udevice *dev)
	77	{
	78	struct dm_regulator_uclass_platdata *uc_pdata;
	79
	80	uc_pdata = dev_get_uclass_platdata(dev);
	81	if (!uc_pdata)
	82	return -ENXIO;
	83
	84	if (uc_pdata->min_uA != uc_pdata->max_uA) {
	85	debug("Invalid constraints for: %s\n", uc_pdata->name);
	86	return -EINVAL;
	87	}
	88
	89	return uc_pdata->min_uA;
	90	}
	91
0f2194d8	92	static int fixed_regulator_get_enable(struct udevice *dev)
9923a8b4 PM	93	{
	94	struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
	95
dc06f63f	96	/* Enable GPIO is optional */
9923a8b4	97	if (!dev_pdata->gpio.dev)
dc06f63f	98	return true;
9923a8b4 PM	99
	100	return dm_gpio_get_value(&dev_pdata->gpio);
	101	}
	102
	103	static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
	104	{
	105	struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
	106	int ret;
	107
a5493f82 SG	108	debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
	109	dev->name, enable, dev_pdata->startup_delay_us,
	110	dm_gpio_is_valid(&dev_pdata->gpio));
dc06f63f	111	/* Enable GPIO is optional */
a5493f82	112	if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
dc06f63f MZ	113	if (!enable)
	114	return -ENOSYS;
	115	return 0;
	116	}
9923a8b4 PM	117
	118	ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
	119	if (ret) {
9b643e31	120	pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
9923a8b4 PM	121	enable);
	122	return ret;
	123	}
7302fbb3 JK	124
	125	if (enable && dev_pdata->startup_delay_us)
	126	udelay(dev_pdata->startup_delay_us);
a5493f82	127	debug("%s: done\n", __func__);
7302fbb3	128
9923a8b4 PM	129	return 0;
	130	}
	131
	132	static const struct dm_regulator_ops fixed_regulator_ops = {
	133	.get_value = fixed_regulator_get_value,
	134	.get_current = fixed_regulator_get_current,
	135	.get_enable = fixed_regulator_get_enable,
	136	.set_enable = fixed_regulator_set_enable,
	137	};
	138
	139	static const struct udevice_id fixed_regulator_ids[] = {
	140	{ .compatible = "regulator-fixed" },
	141	{ },
	142	};
	143
	144	U_BOOT_DRIVER(fixed_regulator) = {
	145	.name = "fixed regulator",
	146	.id = UCLASS_REGULATOR,
	147	.ops = &fixed_regulator_ops,
	148	.of_match = fixed_regulator_ids,
	149	.ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
	150	.platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
	151	};