140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
// 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 <lars.ivar.miljeteig@remarkable.com>
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// Alistair Francis <alistair@alistair23.me>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/mfd/sy7636a.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regmap.h>
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struct sy7636a_data {
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struct regmap *regmap;
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struct gpio_desc *pgood_gpio;
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};
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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_data *data = dev_get_drvdata(rdev->dev.parent);
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int ret = 0;
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ret = gpiod_get_value_cansleep(data->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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.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 regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
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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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struct sy7636a_data *data;
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int ret;
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if (!regmap)
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return -EPROBE_DEFER;
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gdp = devm_gpiod_get(pdev->dev.parent, "epd-pwr-good", GPIOD_IN);
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if (IS_ERR(gdp)) {
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dev_err(pdev->dev.parent, "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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data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->regmap = regmap;
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data->pgood_gpio = gdp;
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platform_set_drvdata(pdev, data);
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ret = regmap_write(regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0);
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if (ret) {
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dev_err(pdev->dev.parent, "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 = pdev->dev.parent->of_node;
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config.regmap = 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(pdev->dev.parent, "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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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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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 <lars.ivar.miljeteig@remarkable.com>");
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MODULE_DESCRIPTION("SY7636A voltage regulator driver");
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MODULE_LICENSE("GPL v2");
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