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 struct regulator_desc *desc; 48 }; 49 50 static 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 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 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 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