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128 lines
3.3 KiB
128 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// Functions to access SY3686A power management chip voltages |
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// |
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// Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ |
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// |
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// Authors: Lars Ivar Miljeteig <[email protected]> |
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// Alistair Francis <[email protected]> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/mfd/sy7636a.h> |
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#define SY7636A_POLL_ENABLED_TIME 500 |
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static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev) |
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{ |
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int ret; |
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unsigned int val, val_h; |
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ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); |
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if (ret) |
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return ret; |
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ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); |
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if (ret) |
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return ret; |
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val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); |
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return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; |
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} |
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static int sy7636a_get_status(struct regulator_dev *rdev) |
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{ |
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struct sy7636a *sy7636a = rdev_get_drvdata(rdev); |
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int ret = 0; |
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ret = gpiod_get_value_cansleep(sy7636a->pgood_gpio); |
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if (ret < 0) |
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dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", ret); |
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return ret; |
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} |
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static const struct regulator_ops sy7636a_vcom_volt_ops = { |
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.get_voltage = sy7636a_get_vcom_voltage_op, |
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.enable = regulator_enable_regmap, |
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.disable = regulator_disable_regmap, |
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.is_enabled = regulator_is_enabled_regmap, |
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.get_status = sy7636a_get_status, |
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}; |
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static const struct regulator_desc desc = { |
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.name = "vcom", |
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.id = 0, |
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.ops = &sy7636a_vcom_volt_ops, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.enable_reg = SY7636A_REG_OPERATION_MODE_CRL, |
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.enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF, |
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.poll_enabled_time = SY7636A_POLL_ENABLED_TIME, |
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.regulators_node = of_match_ptr("regulators"), |
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.of_match = of_match_ptr("vcom"), |
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}; |
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static int sy7636a_regulator_probe(struct platform_device *pdev) |
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{ |
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struct sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent); |
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struct regulator_config config = { }; |
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struct regulator_dev *rdev; |
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struct gpio_desc *gdp; |
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int ret; |
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if (!sy7636a) |
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return -EPROBE_DEFER; |
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platform_set_drvdata(pdev, sy7636a); |
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gdp = devm_gpiod_get(sy7636a->dev, "epd-pwr-good", GPIOD_IN); |
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if (IS_ERR(gdp)) { |
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dev_err(sy7636a->dev, "Power good GPIO fault %ld\n", PTR_ERR(gdp)); |
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return PTR_ERR(gdp); |
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} |
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sy7636a->pgood_gpio = gdp; |
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ret = regmap_write(sy7636a->regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0); |
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if (ret) { |
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dev_err(sy7636a->dev, "Failed to initialize regulator: %d\n", ret); |
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return ret; |
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} |
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config.dev = &pdev->dev; |
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config.dev->of_node = sy7636a->dev->of_node; |
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config.driver_data = sy7636a; |
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config.regmap = sy7636a->regmap; |
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rdev = devm_regulator_register(&pdev->dev, &desc, &config); |
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if (IS_ERR(rdev)) { |
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dev_err(sy7636a->dev, "Failed to register %s regulator\n", |
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pdev->name); |
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return PTR_ERR(rdev); |
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} |
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return 0; |
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} |
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static const struct platform_device_id sy7636a_regulator_id_table[] = { |
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{ "sy7636a-regulator", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table); |
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static struct platform_driver sy7636a_regulator_driver = { |
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.driver = { |
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.name = "sy7636a-regulator", |
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}, |
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.probe = sy7636a_regulator_probe, |
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.id_table = sy7636a_regulator_id_table, |
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}; |
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module_platform_driver(sy7636a_regulator_driver); |
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MODULE_AUTHOR("Lars Ivar Miljeteig <[email protected]>"); |
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MODULE_DESCRIPTION("SY7636A voltage regulator driver"); |
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MODULE_LICENSE("GPL v2");
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