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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | // SPDX-License-Identifier: GPL-2.0+ // // Functions to access SY3686A power management chip voltages // // Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ // // Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> // Alistair Francis <alistair@alistair23.me> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/mfd/sy7636a.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/regmap.h> struct sy7636a_data { struct regmap *regmap; struct gpio_desc *pgood_gpio; }; static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev) { int ret; unsigned int val, val_h; ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); if (ret) return ret; ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); if (ret) return ret; val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; } static int sy7636a_get_status(struct regulator_dev *rdev) { struct sy7636a_data *data = dev_get_drvdata(rdev->dev.parent); int ret = 0; ret = gpiod_get_value_cansleep(data->pgood_gpio); if (ret < 0) dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", ret); return ret; } static const struct regulator_ops sy7636a_vcom_volt_ops = { .get_voltage = sy7636a_get_vcom_voltage_op, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .get_status = sy7636a_get_status, }; static const struct regulator_desc desc = { .name = "vcom", .id = 0, .ops = &sy7636a_vcom_volt_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, .enable_reg = SY7636A_REG_OPERATION_MODE_CRL, .enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF, .regulators_node = of_match_ptr("regulators"), .of_match = of_match_ptr("vcom"), }; static int sy7636a_regulator_probe(struct platform_device *pdev) { struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); struct regulator_config config = { }; struct regulator_dev *rdev; struct gpio_desc *gdp; struct sy7636a_data *data; int ret; if (!regmap) return -EPROBE_DEFER; gdp = devm_gpiod_get(pdev->dev.parent, "epd-pwr-good", GPIOD_IN); if (IS_ERR(gdp)) { dev_err(pdev->dev.parent, "Power good GPIO fault %ld\n", PTR_ERR(gdp)); return PTR_ERR(gdp); } data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL); if (!data) return -ENOMEM; data->regmap = regmap; data->pgood_gpio = gdp; platform_set_drvdata(pdev, data); ret = regmap_write(regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0); if (ret) { dev_err(pdev->dev.parent, "Failed to initialize regulator: %d\n", ret); return ret; } config.dev = &pdev->dev; config.dev->of_node = pdev->dev.parent->of_node; config.regmap = regmap; rdev = devm_regulator_register(&pdev->dev, &desc, &config); if (IS_ERR(rdev)) { dev_err(pdev->dev.parent, "Failed to register %s regulator\n", pdev->name); return PTR_ERR(rdev); } return 0; } static const struct platform_device_id sy7636a_regulator_id_table[] = { { "sy7636a-regulator", }, { } }; MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table); static struct platform_driver sy7636a_regulator_driver = { .driver = { .name = "sy7636a-regulator", .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, .probe = sy7636a_regulator_probe, .id_table = sy7636a_regulator_id_table, }; module_platform_driver(sy7636a_regulator_driver); MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>"); MODULE_DESCRIPTION("SY7636A voltage regulator driver"); MODULE_LICENSE("GPL v2"); |