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
34 struct 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
43 struct labibb_regulator_data {
44 const char *name;
45 u8 type;
46 u16 base;
47 const struct regulator_desc *desc;
48 };
49
50 static 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
56 static 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
68 static 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
80 static 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
86 static const struct of_device_id qcom_labibb_match[] = {
87 { .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data},
88 { },
89 };
90 MODULE_DEVICE_TABLE(of, qcom_labibb_match);
91
qcom_labibb_regulator_probe(struct platform_device * pdev)92 static 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
163 static 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 };
170 module_platform_driver(qcom_labibb_regulator_driver);
171
172 MODULE_DESCRIPTION("Qualcomm labibb driver");
173 MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>");
174 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
175 MODULE_LICENSE("GPL v2");
176