projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 1f26d1c1 TB |
2 | /* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
| 3 | * Copyright (c) 2015, Sony Mobile Communications Inc. | |
| 1f26d1c1 TB |
4 | */ |
| 5 | ||
| 6 | #include <linux/kernel.h> | |
| 7 | #include <linux/module.h> | |
| 8 | #include <linux/slab.h> | |
| 9 | #include <linux/of.h> | |
| 10 | #include <linux/regmap.h> | |
| 11 | #include <linux/of_device.h> | |
| 12 | #include <linux/platform_device.h> | |
| 13 | ||
| 14 | struct qcom_coincell { | |
| 15 | struct device *dev; | |
| 16 | struct regmap *regmap; | |
| 17 | u32 base_addr; | |
| 18 | }; | |
| 19 | ||
| 20 | #define QCOM_COINCELL_REG_RSET 0x44 | |
| 21 | #define QCOM_COINCELL_REG_VSET 0x45 | |
| 22 | #define QCOM_COINCELL_REG_ENABLE 0x46 | |
| 23 | ||
| 24 | #define QCOM_COINCELL_ENABLE BIT(7) | |
| 25 | ||
| 26 | static const int qcom_rset_map[] = { 2100, 1700, 1200, 800 }; | |
| 27 | static const int qcom_vset_map[] = { 2500, 3200, 3100, 3000 }; | |
| 28 | /* NOTE: for pm8921 and others, voltage of 2500 is 16 (10000b), not 0 */ | |
| 29 | ||
| 30 | /* if enable==0, rset and vset are ignored */ | |
| 31 | static int qcom_coincell_chgr_config(struct qcom_coincell *chgr, int rset, | |
| 32 | int vset, bool enable) | |
| 33 | { | |
| 34 | int i, j, rc; | |
| 35 | ||
| 36 | /* if disabling, just do that and skip other operations */ | |
| 37 | if (!enable) | |
| 38 | return regmap_write(chgr->regmap, | |
| 39 | chgr->base_addr + QCOM_COINCELL_REG_ENABLE, 0); | |
| 40 | ||
| 41 | /* find index for current-limiting resistor */ | |
| 42 | for (i = 0; i < ARRAY_SIZE(qcom_rset_map); i++) | |
| 43 | if (rset == qcom_rset_map[i]) | |
| 44 | break; | |
| 45 | ||
| 46 | if (i >= ARRAY_SIZE(qcom_rset_map)) { | |
| 47 | dev_err(chgr->dev, "invalid rset-ohms value %d\n", rset); | |
| 48 | return -EINVAL; | |
| 49 | } | |
| 50 | ||
| 51 | /* find index for charge voltage */ | |
| 52 | for (j = 0; j < ARRAY_SIZE(qcom_vset_map); j++) | |
| 53 | if (vset == qcom_vset_map[j]) | |
| 54 | break; | |
| 55 | ||
| 56 | if (j >= ARRAY_SIZE(qcom_vset_map)) { | |
| 57 | dev_err(chgr->dev, "invalid vset-millivolts value %d\n", vset); | |
| 58 | return -EINVAL; | |
| 59 | } | |
| 60 | ||
| 61 | rc = regmap_write(chgr->regmap, | |
| 62 | chgr->base_addr + QCOM_COINCELL_REG_RSET, i); | |
| 63 | if (rc) { | |
| 64 | /* | |
| 65 | * This is mainly to flag a bad base_addr (reg) from dts. | |
| 66 | * Other failures writing to the registers should be | |
| 67 | * extremely rare, or indicative of problems that | |
| 68 | * should be reported elsewhere (eg. spmi failure). | |
| 69 | */ | |
| 70 | dev_err(chgr->dev, "could not write to RSET register\n"); | |
| 71 | return rc; | |
| 72 | } | |
| 73 | ||
| 74 | rc = regmap_write(chgr->regmap, | |
| 75 | chgr->base_addr + QCOM_COINCELL_REG_VSET, j); | |
| 76 | if (rc) | |
| 77 | return rc; | |
| 78 | ||
| 79 | /* set 'enable' register */ | |
| 80 | return regmap_write(chgr->regmap, | |
| 81 | chgr->base_addr + QCOM_COINCELL_REG_ENABLE, | |
| 82 | QCOM_COINCELL_ENABLE); | |
| 83 | } | |
| 84 | ||
| 85 | static int qcom_coincell_probe(struct platform_device *pdev) | |
| 86 | { | |
| 87 | struct device_node *node = pdev->dev.of_node; | |
| 88 | struct qcom_coincell chgr; | |
| 66b58edf DC |
89 | u32 rset = 0; |
| 90 | u32 vset = 0; | |
| 1f26d1c1 TB |
91 | bool enable; |
| 92 | int rc; | |
| 93 | ||
| 94 | chgr.dev = &pdev->dev; | |
| 95 | ||
| 96 | chgr.regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
| 97 | if (!chgr.regmap) { | |
| 98 | dev_err(chgr.dev, "Unable to get regmap\n"); | |
| 99 | return -EINVAL; | |
| 100 | } | |
| 101 | ||
| 102 | rc = of_property_read_u32(node, "reg", &chgr.base_addr); | |
| 103 | if (rc) | |
| 104 | return rc; | |
| 105 | ||
| 106 | enable = !of_property_read_bool(node, "qcom,charger-disable"); | |
| 107 | ||
| 108 | if (enable) { | |
| 109 | rc = of_property_read_u32(node, "qcom,rset-ohms", &rset); | |
| 110 | if (rc) { | |
| 111 | dev_err(chgr.dev, | |
| 112 | "can't find 'qcom,rset-ohms' in DT block"); | |
| 113 | return rc; | |
| 114 | } | |
| 115 | ||
| 116 | rc = of_property_read_u32(node, "qcom,vset-millivolts", &vset); | |
| 117 | if (rc) { | |
| 118 | dev_err(chgr.dev, | |
| 119 | "can't find 'qcom,vset-millivolts' in DT block"); | |
| 120 | return rc; | |
| 121 | } | |
| 122 | } | |
| 123 | ||
| 124 | return qcom_coincell_chgr_config(&chgr, rset, vset, enable); | |
| 125 | } | |
| 126 | ||
| 127 | static const struct of_device_id qcom_coincell_match_table[] = { | |
| 128 | { .compatible = "qcom,pm8941-coincell", }, | |
| 129 | {} | |
| 130 | }; | |
| 131 | ||
| 132 | MODULE_DEVICE_TABLE(of, qcom_coincell_match_table); | |
| 133 | ||
| 134 | static struct platform_driver qcom_coincell_driver = { | |
| 135 | .driver = { | |
| 136 | .name = "qcom-spmi-coincell", | |
| 137 | .of_match_table = qcom_coincell_match_table, | |
| 138 | }, | |
| 139 | .probe = qcom_coincell_probe, | |
| 140 | }; | |
| 141 | ||
| 142 | module_platform_driver(qcom_coincell_driver); | |
| 143 | ||
| 144 | MODULE_DESCRIPTION("Qualcomm PMIC coincell charger driver"); | |
| 145 | MODULE_LICENSE("GPL v2"); |