regulator: Add driver for cros-ec-regulator (8d9f8d57) · Commits · EulixOS / Software / Kernel

drivers/regulator/Kconfig

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		@@ -238,6 +238,16 @@ config REGULATOR_CPCAP
		Say y here for CPCAP regulator found on some Motorola phones
		and tablets such as Droid 4.

		config REGULATOR_CROS_EC
		tristate "ChromeOS EC regulators"
		depends on CROS_EC && OF
		help
		This driver supports voltage regulators that is connected to ChromeOS
		EC and controlled through EC host commands.

		This driver can also be built as a module. If so, the module
		will be called cros-ec-regulator.

		config REGULATOR_DA903X
		tristate "Dialog Semiconductor DA9030/DA9034 regulators"
		depends on PMIC_DA903X

drivers/regulator/Makefile

+1 −0

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		@@ -13,6 +13,7 @@ obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
		obj-$(CONFIG_REGULATOR_88PG86X) += 88pg86x.o
		obj-$(CONFIG_REGULATOR_88PM800) += 88pm800-regulator.o
		obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
		obj-$(CONFIG_REGULATOR_CROS_EC) += cros-ec-regulator.o
		obj-$(CONFIG_REGULATOR_CPCAP) += cpcap-regulator.o
		obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
		obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o

drivers/regulator/cros-ec-regulator.c

0 → 100644

+257 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-only
		//
		// Copyright 2020 Google LLC.

		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/platform_data/cros_ec_proto.h>
		#include <linux/platform_device.h>
		#include <linux/regulator/driver.h>
		#include <linux/regulator/machine.h>
		#include <linux/regulator/of_regulator.h>
		#include <linux/slab.h>

		struct cros_ec_regulator_data {
		struct regulator_desc desc;
		struct regulator_dev *dev;
		struct cros_ec_device *ec_dev;

		u32 index;

		u16 *voltages_mV;
		u16 num_voltages;
		};

		static int cros_ec_cmd(struct cros_ec_device *ec, u32 version, u32 command,
		void outdata, u32 outsize, void indata, u32 insize)
		{
		struct cros_ec_command *msg;
		int ret;

		msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
		if (!msg)
		return -ENOMEM;

		msg->version = version;
		msg->command = command;
		msg->outsize = outsize;
		msg->insize = insize;

		if (outdata && outsize > 0)
		memcpy(msg->data, outdata, outsize);

		ret = cros_ec_cmd_xfer_status(ec, msg);
		if (ret < 0)
		goto cleanup;

		if (insize)
		memcpy(indata, msg->data, insize);

		cleanup:
		kfree(msg);
		return ret;
		}

		static int cros_ec_regulator_enable(struct regulator_dev *dev)
		{
		struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
		struct ec_params_regulator_enable cmd = {
		.index = data->index,
		.enable = 1,
		};

		return cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_ENABLE, &cmd,
		sizeof(cmd), NULL, 0);
		}

		static int cros_ec_regulator_disable(struct regulator_dev *dev)
		{
		struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
		struct ec_params_regulator_enable cmd = {
		.index = data->index,
		.enable = 0,
		};

		return cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_ENABLE, &cmd,
		sizeof(cmd), NULL, 0);
		}

		static int cros_ec_regulator_is_enabled(struct regulator_dev *dev)
		{
		struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
		struct ec_params_regulator_is_enabled cmd = {
		.index = data->index,
		};
		struct ec_response_regulator_is_enabled resp;
		int ret;

		ret = cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_IS_ENABLED, &cmd,
		sizeof(cmd), &resp, sizeof(resp));
		if (ret < 0)
		return ret;
		return resp.enabled;
		}

		static int cros_ec_regulator_list_voltage(struct regulator_dev *dev,
		unsigned int selector)
		{
		struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);

		if (selector >= data->num_voltages)
		return -EINVAL;

		return data->voltages_mV[selector] * 1000;
		}

		static int cros_ec_regulator_get_voltage(struct regulator_dev *dev)
		{
		struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
		struct ec_params_regulator_get_voltage cmd = {
		.index = data->index,
		};
		struct ec_response_regulator_get_voltage resp;
		int ret;

		ret = cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_GET_VOLTAGE, &cmd,
		sizeof(cmd), &resp, sizeof(resp));
		if (ret < 0)
		return ret;
		return resp.voltage_mv * 1000;
		}

		static int cros_ec_regulator_set_voltage(struct regulator_dev *dev, int min_uV,
		int max_uV, unsigned int *selector)
		{
		struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
		int min_mV = DIV_ROUND_UP(min_uV, 1000);
		int max_mV = max_uV / 1000;
		struct ec_params_regulator_set_voltage cmd = {
		.index = data->index,
		.min_mv = min_mV,
		.max_mv = max_mV,
		};

		/*
		* This can happen when the given range [min_uV, max_uV] doesn't
		* contain any voltage that can be represented exactly in mV.
		*/
		if (min_mV > max_mV)
		return -EINVAL;

		return cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_SET_VOLTAGE, &cmd,
		sizeof(cmd), NULL, 0);
		}

		static struct regulator_ops cros_ec_regulator_voltage_ops = {
		.enable = cros_ec_regulator_enable,
		.disable = cros_ec_regulator_disable,
		.is_enabled = cros_ec_regulator_is_enabled,
		.list_voltage = cros_ec_regulator_list_voltage,
		.get_voltage = cros_ec_regulator_get_voltage,
		.set_voltage = cros_ec_regulator_set_voltage,
		};

		static int cros_ec_regulator_init_info(struct device *dev,
		struct cros_ec_regulator_data *data)
		{
		struct ec_params_regulator_get_info cmd = {
		.index = data->index,
		};
		struct ec_response_regulator_get_info resp;
		int ret;

		ret = cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_GET_INFO, &cmd,
		sizeof(cmd), &resp, sizeof(resp));
		if (ret < 0)
		return ret;

		data->num_voltages =
		min_t(u16, ARRAY_SIZE(resp.voltages_mv), resp.num_voltages);
		data->voltages_mV =
		devm_kmemdup(dev, resp.voltages_mv,
		sizeof(u16) * data->num_voltages, GFP_KERNEL);
		data->desc.n_voltages = data->num_voltages;

		/* Make sure the returned name is always a valid string */
		resp.name[ARRAY_SIZE(resp.name) - 1] = '\0';
		data->desc.name = devm_kstrdup(dev, resp.name, GFP_KERNEL);
		if (!data->desc.name)
		return -ENOMEM;

		return 0;
		}

		static int cros_ec_regulator_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *np = dev->of_node;
		struct cros_ec_regulator_data *drvdata;
		struct regulator_init_data *init_data;
		struct regulator_config cfg = {};
		struct regulator_desc *desc;
		int ret;

		drvdata = devm_kzalloc(
		&pdev->dev, sizeof(struct cros_ec_regulator_data), GFP_KERNEL);
		if (!drvdata)
		return -ENOMEM;

		drvdata->ec_dev = dev_get_drvdata(dev->parent);
		desc = &drvdata->desc;

		init_data = of_get_regulator_init_data(dev, np, desc);
		if (!init_data)
		return -EINVAL;

		ret = of_property_read_u32(np, "reg", &drvdata->index);
		if (ret < 0)
		return ret;

		desc->owner = THIS_MODULE;
		desc->type = REGULATOR_VOLTAGE;
		desc->ops = &cros_ec_regulator_voltage_ops;

		ret = cros_ec_regulator_init_info(dev, drvdata);
		if (ret < 0)
		return ret;

		cfg.dev = &pdev->dev;
		cfg.init_data = init_data;
		cfg.driver_data = drvdata;
		cfg.of_node = np;

		drvdata->dev = devm_regulator_register(dev, &drvdata->desc, &cfg);
		if (IS_ERR(drvdata->dev)) {
		ret = PTR_ERR(drvdata->dev);
		dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
		goto free_name;
		}

		platform_set_drvdata(pdev, drvdata);

		return 0;

		free_name:
		kfree(desc->name);
		return ret;
		}

		static const struct of_device_id regulator_cros_ec_of_match[] = {
		{ .compatible = "google,cros-ec-regulator", },
		{}
		};
		MODULE_DEVICE_TABLE(of, regulator_cros_ec_of_match);

		static struct platform_driver cros_ec_regulator_driver = {
		.probe = cros_ec_regulator_probe,
		.driver = {
		.name = "cros-ec-regulator",
		.of_match_table = regulator_cros_ec_of_match,
		},
		};

		module_platform_driver(cros_ec_regulator_driver);

		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("ChromeOS EC controlled regulator");
		MODULE_AUTHOR("Pi-Hsun Shih <pihsun@chromium.org>");