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	struct regulator_desc		*desc;
 48};
 49
 50static 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 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 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");