1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (c) 2020, The Linux Foundation. All rights reserved.
3
4#include <linux/module.h>
5#include <linux/of_irq.h>
6#include <linux/of.h>
7#include <linux/of_device.h>
8#include <linux/platform_device.h>
9#include <linux/regmap.h>
10#include <linux/regulator/driver.h>
11#include <linux/regulator/of_regulator.h>
12
13#define REG_PERPH_TYPE                  0x04
14
15#define QCOM_LAB_TYPE			0x24
16#define QCOM_IBB_TYPE			0x20
17
18#define PMI8998_LAB_REG_BASE		0xde00
19#define PMI8998_IBB_REG_BASE		0xdc00
20
21#define REG_LABIBB_STATUS1		0x08
22#define REG_LABIBB_ENABLE_CTL		0x46
23#define LABIBB_STATUS1_VREG_OK_BIT	BIT(7)
24#define LABIBB_CONTROL_ENABLE		BIT(7)
25
26#define LAB_ENABLE_CTL_MASK		BIT(7)
27#define IBB_ENABLE_CTL_MASK		(BIT(7) | BIT(6))
28
29#define LABIBB_OFF_ON_DELAY		1000
30#define LAB_ENABLE_TIME			(LABIBB_OFF_ON_DELAY * 2)
31#define IBB_ENABLE_TIME			(LABIBB_OFF_ON_DELAY * 10)
32#define LABIBB_POLL_ENABLED_TIME	1000
33
34struct labibb_regulator {
35	struct regulator_desc		desc;
36	struct device			*dev;
37	struct regmap			*regmap;
38	struct regulator_dev		*rdev;
39	u16				base;
40	u8				type;
41};
42
43struct labibb_regulator_data {
44	const char			*name;
45	u8				type;
46	u16				base;
47	const struct regulator_desc	*desc;
48};
49
50static const struct regulator_ops qcom_labibb_ops = {
51	.enable			= regulator_enable_regmap,
52	.disable		= regulator_disable_regmap,
53	.is_enabled		= regulator_is_enabled_regmap,
54};
55
56static const struct regulator_desc pmi8998_lab_desc = {
57	.enable_mask		= LAB_ENABLE_CTL_MASK,
58	.enable_reg		= (PMI8998_LAB_REG_BASE + REG_LABIBB_ENABLE_CTL),
59	.enable_val		= LABIBB_CONTROL_ENABLE,
60	.enable_time		= LAB_ENABLE_TIME,
61	.poll_enabled_time	= LABIBB_POLL_ENABLED_TIME,
62	.off_on_delay		= LABIBB_OFF_ON_DELAY,
63	.owner			= THIS_MODULE,
64	.type			= REGULATOR_VOLTAGE,
65	.ops			= &qcom_labibb_ops,
66};
67
68static const struct regulator_desc pmi8998_ibb_desc = {
69	.enable_mask		= IBB_ENABLE_CTL_MASK,
70	.enable_reg		= (PMI8998_IBB_REG_BASE + REG_LABIBB_ENABLE_CTL),
71	.enable_val		= LABIBB_CONTROL_ENABLE,
72	.enable_time		= IBB_ENABLE_TIME,
73	.poll_enabled_time	= LABIBB_POLL_ENABLED_TIME,
74	.off_on_delay		= LABIBB_OFF_ON_DELAY,
75	.owner			= THIS_MODULE,
76	.type			= REGULATOR_VOLTAGE,
77	.ops			= &qcom_labibb_ops,
78};
79
80static const struct labibb_regulator_data pmi8998_labibb_data[] = {
81	{"lab", QCOM_LAB_TYPE, PMI8998_LAB_REG_BASE, &pmi8998_lab_desc},
82	{"ibb", QCOM_IBB_TYPE, PMI8998_IBB_REG_BASE, &pmi8998_ibb_desc},
83	{ },
84};
85
86static const struct of_device_id qcom_labibb_match[] = {
87	{ .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data},
88	{ },
89};
90MODULE_DEVICE_TABLE(of, qcom_labibb_match);
91
92static int qcom_labibb_regulator_probe(struct platform_device *pdev)
93{
94	struct labibb_regulator *vreg;
95	struct device *dev = &pdev->dev;
96	struct regulator_config cfg = {};
97
98	const struct of_device_id *match;
99	const struct labibb_regulator_data *reg_data;
100	struct regmap *reg_regmap;
101	unsigned int type;
102	int ret;
103
104	reg_regmap = dev_get_regmap(pdev->dev.parent, NULL);
105	if (!reg_regmap) {
106		dev_err(&pdev->dev, "Couldn't get parent's regmap\n");
107		return -ENODEV;
108	}
109
110	match = of_match_device(qcom_labibb_match, &pdev->dev);
111	if (!match)
112		return -ENODEV;
113
114	for (reg_data = match->data; reg_data->name; reg_data++) {
115
116		/* Validate if the type of regulator is indeed
117		 * what's mentioned in DT.
118		 */
119		ret = regmap_read(reg_regmap, reg_data->base + REG_PERPH_TYPE,
120				  &type);
121		if (ret < 0) {
122			dev_err(dev,
123				"Peripheral type read failed ret=%d\n",
124				ret);
125			return -EINVAL;
126		}
127
128		if (WARN_ON((type != QCOM_LAB_TYPE) && (type != QCOM_IBB_TYPE)) ||
129		    WARN_ON(type != reg_data->type))
130			return -EINVAL;
131
132		vreg  = devm_kzalloc(&pdev->dev, sizeof(*vreg),
133					   GFP_KERNEL);
134		if (!vreg)
135			return -ENOMEM;
136
137		vreg->regmap = reg_regmap;
138		vreg->dev = dev;
139		vreg->base = reg_data->base;
140		vreg->type = reg_data->type;
141
142		memcpy(&vreg->desc, reg_data->desc, sizeof(vreg->desc));
143		vreg->desc.of_match = reg_data->name;
144		vreg->desc.name = reg_data->name;
145
146		cfg.dev = vreg->dev;
147		cfg.driver_data = vreg;
148		cfg.regmap = vreg->regmap;
149
150		vreg->rdev = devm_regulator_register(vreg->dev, &vreg->desc,
151							&cfg);
152
153		if (IS_ERR(vreg->rdev)) {
154			dev_err(dev, "qcom_labibb: error registering %s : %d\n",
155					reg_data->name, ret);
156			return PTR_ERR(vreg->rdev);
157		}
158	}
159
160	return 0;
161}
162
163static struct platform_driver qcom_labibb_regulator_driver = {
164	.driver	= {
165		.name = "qcom-lab-ibb-regulator",
166		.of_match_table	= qcom_labibb_match,
167	},
168	.probe = qcom_labibb_regulator_probe,
169};
170module_platform_driver(qcom_labibb_regulator_driver);
171
172MODULE_DESCRIPTION("Qualcomm labibb driver");
173MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>");
174MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
175MODULE_LICENSE("GPL v2");
176