| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (C) 2019 MediaTek Inc. |
| 4 | * Author: Argus Lin <argus.lin@mediatek.com> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/of_platform.h> |
| 10 | #include <linux/regmap.h> |
| 11 | #include <linux/spmi.h> |
| 12 | |
| 13 | struct mtk_spmi_pmic_data { |
| 14 | unsigned int max_register; |
| 15 | unsigned int check_reg; |
| 16 | }; |
| 17 | |
| 18 | #define MTK_SPMI_PMIC_DATA(chip, _max_register, _check_reg) \ |
| 19 | static const struct mtk_spmi_pmic_data chip##_data = \ |
| 20 | { \ |
| 21 | .max_register = _max_register, \ |
| 22 | .check_reg = _check_reg, \ |
| 23 | } \ |
| 24 | |
| 25 | MTK_SPMI_PMIC_DATA(common, 0xFFFF, 0x39E); |
| 26 | MTK_SPMI_PMIC_DATA(mt6315, 0x16D0, 0x3A5); |
| 27 | MTK_SPMI_PMIC_DATA(mt6330, 0x2300, 0x39E); |
| 28 | |
| 29 | static const struct of_device_id mtk_spmi_pmic_id_table[] = { |
| 30 | { .compatible = "mtk,spmi-pmic", .data = &common_data }, |
| 31 | { .compatible = "mediatek,mt6315", .data = &mt6315_data }, |
| 32 | { .compatible = "mediatek,mt6330_fpga", .data = &mt6330_data }, |
| 33 | { } |
| 34 | }; |
| 35 | |
| 36 | static int mtk_spmi_pmic_rw_test(struct regmap *map, |
| 37 | const struct mtk_spmi_pmic_data *data) |
| 38 | { |
| 39 | unsigned int rdata = 0, backup; |
| 40 | u8 wdata[] = {0xAB, 0xCD}; |
| 41 | int i, ret; |
| 42 | |
| 43 | ret = regmap_read(map, data->check_reg, &rdata); |
| 44 | if (ret) |
| 45 | return -EIO; |
| 46 | backup = rdata; |
| 47 | |
| 48 | for (i = 0; i < ARRAY_SIZE(wdata); i++) { |
| 49 | ret = regmap_write(map, data->check_reg, wdata[i]); |
| 50 | ret |= regmap_read(map, data->check_reg, &rdata); |
| 51 | if (ret || (rdata != wdata[i])) { |
| 52 | pr_notice("%s fail, rdata(0x%x)!=wdata(0x%x)\n", |
| 53 | __func__, rdata, wdata[i]); |
| 54 | return -EIO; |
| 55 | } |
| 56 | } |
| 57 | ret = regmap_write(map, data->check_reg, backup); |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static int mtk_spmi_pmic_probe(struct spmi_device *sdev) |
| 62 | { |
| 63 | struct regmap_config spmi_regmap_config; |
| 64 | struct regmap *regmap; |
| 65 | const struct of_device_id *match; |
| 66 | const struct mtk_spmi_pmic_data *data; |
| 67 | int ret; |
| 68 | |
| 69 | match = of_match_device(mtk_spmi_pmic_id_table, &sdev->dev); |
| 70 | if (!match) |
| 71 | return -ENODEV; |
| 72 | data = (struct mtk_spmi_pmic_data *)match->data; |
| 73 | dev_notice(&sdev->dev, "%s usid:%d\n", match->compatible, sdev->usid); |
| 74 | |
| 75 | memset(&spmi_regmap_config, 0, sizeof(struct regmap_config)); |
| 76 | spmi_regmap_config.reg_bits = 16; |
| 77 | spmi_regmap_config.val_bits = 8; |
| 78 | spmi_regmap_config.fast_io = true; |
| 79 | spmi_regmap_config.max_register = data->max_register; |
| 80 | regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); |
| 81 | if (IS_ERR(regmap)) |
| 82 | return PTR_ERR(regmap); |
| 83 | ret = mtk_spmi_pmic_rw_test(regmap, data); |
| 84 | if (ret) |
| 85 | return ret; |
| 86 | |
| 87 | return devm_of_platform_populate(&sdev->dev); |
| 88 | } |
| 89 | |
| 90 | MODULE_DEVICE_TABLE(of, mtk_spmi_pmic_id_table); |
| 91 | |
| 92 | static struct spmi_driver mtk_spmi_pmic_driver = { |
| 93 | .probe = mtk_spmi_pmic_probe, |
| 94 | .driver = { |
| 95 | .name = "mtk-spmi-pmic", |
| 96 | .of_match_table = mtk_spmi_pmic_id_table, |
| 97 | }, |
| 98 | }; |
| 99 | module_spmi_driver(mtk_spmi_pmic_driver); |
| 100 | |
| 101 | MODULE_DESCRIPTION("Mediatek SPMI PMIC driver"); |
| 102 | MODULE_ALIAS("spmi:spmi-pmic"); |
| 103 | MODULE_LICENSE("GPL v2"); |
| 104 | MODULE_AUTHOR("Argus Lin <argus.lin@mediatek.com>"); |