Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/regulator/sy7636a-regulator.c b/drivers/regulator/sy7636a-regulator.c
new file mode 100644
index 0000000000..d1e7ba1fb3
--- /dev/null
+++ b/drivers/regulator/sy7636a-regulator.c
@@ -0,0 +1,139 @@
+// 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");