1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
4 * Keerthy <j-keerthy@ti.com>
5 */
6
7#include <common.h>
8#include <fdtdec.h>
9#include <errno.h>
10#include <dm.h>
11#include <log.h>
12#include <asm/gpio.h>
13#include <linux/printk.h>
14#include <power/pmic.h>
15#include <power/regulator.h>
16#include "regulator_common.h"
17
18#include "regulator_common.h"
19
20#define GPIO_REGULATOR_MAX_STATES	2
21
22struct gpio_regulator_plat {
23	struct regulator_common_plat common;
24	struct gpio_desc gpio; /* GPIO for regulator voltage control */
25	int states[GPIO_REGULATOR_MAX_STATES];
26	int voltages[GPIO_REGULATOR_MAX_STATES];
27};
28
29static int gpio_regulator_of_to_plat(struct udevice *dev)
30{
31	struct dm_regulator_uclass_plat *uc_pdata;
32	struct gpio_regulator_plat *plat;
33	struct gpio_desc *gpio;
34	int ret, count, i, j;
35	u32 states_array[GPIO_REGULATOR_MAX_STATES * 2];
36
37	plat = dev_get_plat(dev);
38	uc_pdata = dev_get_uclass_plat(dev);
39	if (!uc_pdata)
40		return -ENXIO;
41
42	/* Set type to gpio */
43	uc_pdata->type = REGULATOR_TYPE_GPIO;
44
45	/*
46	 * Get gpio regulator gpio desc
47	 * Assuming one GPIO per regulator.
48	 * Can be extended later to multiple GPIOs
49	 * per gpio-regulator. As of now no instance with multiple
50	 * gpios is presnt
51	 */
52	gpio = &plat->gpio;
53	ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
54	if (ret)
55		debug("regulator gpio - not found! Error: %d", ret);
56
57	ret = dev_read_size(dev, "states");
58	if (ret < 0)
59		return ret;
60
61	count = ret / sizeof(states_array[0]);
62	if (count > ARRAY_SIZE(states_array)) {
63		debug("regulator gpio - to many states (%d > %d)",
64		      count / 2, GPIO_REGULATOR_MAX_STATES);
65		count = ARRAY_SIZE(states_array);
66	}
67
68	ret = dev_read_u32_array(dev, "states", states_array, count);
69	if (ret < 0)
70		return ret;
71
72	for (i = 0, j = 0; i < count; i += 2) {
73		plat->voltages[j] = states_array[i];
74		plat->states[j] = states_array[i + 1];
75		j++;
76	}
77
78	return regulator_common_of_to_plat(dev, &plat->common, "enable-gpios");
79}
80
81static int gpio_regulator_get_value(struct udevice *dev)
82{
83	struct dm_regulator_uclass_plat *uc_pdata;
84	struct gpio_regulator_plat *plat = dev_get_plat(dev);
85	int enable;
86
87	if (!plat->gpio.dev)
88		return -ENOSYS;
89
90	uc_pdata = dev_get_uclass_plat(dev);
91	if (uc_pdata->min_uV > uc_pdata->max_uV) {
92		debug("Invalid constraints for: %s\n", uc_pdata->name);
93		return -EINVAL;
94	}
95
96	enable = dm_gpio_get_value(&plat->gpio);
97	if (enable == plat->states[0])
98		return plat->voltages[0];
99	else
100		return plat->voltages[1];
101}
102
103static int gpio_regulator_set_value(struct udevice *dev, int uV)
104{
105	struct gpio_regulator_plat *plat = dev_get_plat(dev);
106	int ret;
107	bool enable;
108
109	if (!plat->gpio.dev)
110		return -ENOSYS;
111
112	if (uV == plat->voltages[0])
113		enable = plat->states[0];
114	else if (uV == plat->voltages[1])
115		enable = plat->states[1];
116	else
117		return -EINVAL;
118
119	ret = dm_gpio_set_value(&plat->gpio, enable);
120	if (ret) {
121		pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
122		      enable);
123		return ret;
124	}
125
126	return 0;
127}
128
129static int gpio_regulator_get_enable(struct udevice *dev)
130{
131	struct gpio_regulator_plat *plat = dev_get_plat(dev);
132	return regulator_common_get_enable(dev, &plat->common);
133}
134
135static int gpio_regulator_set_enable(struct udevice *dev, bool enable)
136{
137	struct gpio_regulator_plat *plat = dev_get_plat(dev);
138	return regulator_common_set_enable(dev, &plat->common, enable);
139}
140
141static const struct dm_regulator_ops gpio_regulator_ops = {
142	.get_value	= gpio_regulator_get_value,
143	.set_value	= gpio_regulator_set_value,
144	.get_enable	= gpio_regulator_get_enable,
145	.set_enable	= gpio_regulator_set_enable,
146};
147
148static const struct udevice_id gpio_regulator_ids[] = {
149	{ .compatible = "regulator-gpio" },
150	{ },
151};
152
153U_BOOT_DRIVER(gpio_regulator) = {
154	.name = "gpio regulator",
155	.id = UCLASS_REGULATOR,
156	.ops = &gpio_regulator_ops,
157	.of_match = gpio_regulator_ids,
158	.of_to_plat = gpio_regulator_of_to_plat,
159	.plat_auto	= sizeof(struct gpio_regulator_plat),
160};
161