regulator: Add driver for cros-ec-regulator
Add driver for cros-ec-regulator, representing a voltage regulator that is connected and controlled by ChromeOS EC, and is controlled by kernel with EC host commands. Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org> Reviewed-by: Prashant Malani <pmalani@chromium.org> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Link: https://lore.kernel.org/r/20200612040526.192878-4-pihsun@chromium.org Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pi-Hsun Shih
Mark Brown
parent
dff08caf35
commit
8d9f8d57e0
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@ -238,6 +238,16 @@ config REGULATOR_CPCAP
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Say y here for CPCAP regulator found on some Motorola phones
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and tablets such as Droid 4.
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config REGULATOR_CROS_EC
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tristate "ChromeOS EC regulators"
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depends on CROS_EC && OF
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help
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This driver supports voltage regulators that is connected to ChromeOS
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EC and controlled through EC host commands.
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This driver can also be built as a module. If so, the module
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will be called cros-ec-regulator.
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config REGULATOR_DA903X
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tristate "Dialog Semiconductor DA9030/DA9034 regulators"
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depends on PMIC_DA903X
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@ -13,6 +13,7 @@ obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
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obj-$(CONFIG_REGULATOR_88PG86X) += 88pg86x.o
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obj-$(CONFIG_REGULATOR_88PM800) += 88pm800-regulator.o
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obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
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obj-$(CONFIG_REGULATOR_CROS_EC) += cros-ec-regulator.o
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obj-$(CONFIG_REGULATOR_CPCAP) += cpcap-regulator.o
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obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
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obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
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@ -0,0 +1,257 @@
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// SPDX-License-Identifier: GPL-2.0-only
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//
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// Copyright 2020 Google LLC.
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_data/cros_ec_proto.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/regulator/of_regulator.h>
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#include <linux/slab.h>
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struct cros_ec_regulator_data {
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struct regulator_desc desc;
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struct regulator_dev *dev;
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struct cros_ec_device *ec_dev;
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u32 index;
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u16 *voltages_mV;
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u16 num_voltages;
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};
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static int cros_ec_cmd(struct cros_ec_device *ec, u32 version, u32 command,
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void *outdata, u32 outsize, void *indata, u32 insize)
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{
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struct cros_ec_command *msg;
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int ret;
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msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->version = version;
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msg->command = command;
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msg->outsize = outsize;
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msg->insize = insize;
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if (outdata && outsize > 0)
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memcpy(msg->data, outdata, outsize);
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ret = cros_ec_cmd_xfer_status(ec, msg);
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if (ret < 0)
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goto cleanup;
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if (insize)
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memcpy(indata, msg->data, insize);
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cleanup:
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kfree(msg);
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return ret;
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}
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static int cros_ec_regulator_enable(struct regulator_dev *dev)
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{
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struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
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struct ec_params_regulator_enable cmd = {
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.index = data->index,
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.enable = 1,
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};
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return cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_ENABLE, &cmd,
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sizeof(cmd), NULL, 0);
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}
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static int cros_ec_regulator_disable(struct regulator_dev *dev)
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{
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struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
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struct ec_params_regulator_enable cmd = {
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.index = data->index,
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.enable = 0,
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};
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return cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_ENABLE, &cmd,
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sizeof(cmd), NULL, 0);
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}
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static int cros_ec_regulator_is_enabled(struct regulator_dev *dev)
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{
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struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
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struct ec_params_regulator_is_enabled cmd = {
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.index = data->index,
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};
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struct ec_response_regulator_is_enabled resp;
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int ret;
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ret = cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_IS_ENABLED, &cmd,
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sizeof(cmd), &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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return resp.enabled;
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}
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static int cros_ec_regulator_list_voltage(struct regulator_dev *dev,
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unsigned int selector)
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{
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struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
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if (selector >= data->num_voltages)
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return -EINVAL;
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return data->voltages_mV[selector] * 1000;
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}
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static int cros_ec_regulator_get_voltage(struct regulator_dev *dev)
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{
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struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
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struct ec_params_regulator_get_voltage cmd = {
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.index = data->index,
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};
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struct ec_response_regulator_get_voltage resp;
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int ret;
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ret = cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_GET_VOLTAGE, &cmd,
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sizeof(cmd), &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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return resp.voltage_mv * 1000;
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}
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static int cros_ec_regulator_set_voltage(struct regulator_dev *dev, int min_uV,
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int max_uV, unsigned int *selector)
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{
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struct cros_ec_regulator_data *data = rdev_get_drvdata(dev);
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int min_mV = DIV_ROUND_UP(min_uV, 1000);
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int max_mV = max_uV / 1000;
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struct ec_params_regulator_set_voltage cmd = {
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.index = data->index,
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.min_mv = min_mV,
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.max_mv = max_mV,
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};
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/*
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* This can happen when the given range [min_uV, max_uV] doesn't
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* contain any voltage that can be represented exactly in mV.
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*/
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if (min_mV > max_mV)
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return -EINVAL;
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return cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_SET_VOLTAGE, &cmd,
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sizeof(cmd), NULL, 0);
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}
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static struct regulator_ops cros_ec_regulator_voltage_ops = {
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.enable = cros_ec_regulator_enable,
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.disable = cros_ec_regulator_disable,
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.is_enabled = cros_ec_regulator_is_enabled,
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.list_voltage = cros_ec_regulator_list_voltage,
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.get_voltage = cros_ec_regulator_get_voltage,
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.set_voltage = cros_ec_regulator_set_voltage,
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};
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static int cros_ec_regulator_init_info(struct device *dev,
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struct cros_ec_regulator_data *data)
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{
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struct ec_params_regulator_get_info cmd = {
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.index = data->index,
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};
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struct ec_response_regulator_get_info resp;
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int ret;
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ret = cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_GET_INFO, &cmd,
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sizeof(cmd), &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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data->num_voltages =
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min_t(u16, ARRAY_SIZE(resp.voltages_mv), resp.num_voltages);
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data->voltages_mV =
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devm_kmemdup(dev, resp.voltages_mv,
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sizeof(u16) * data->num_voltages, GFP_KERNEL);
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data->desc.n_voltages = data->num_voltages;
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/* Make sure the returned name is always a valid string */
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resp.name[ARRAY_SIZE(resp.name) - 1] = '\0';
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data->desc.name = devm_kstrdup(dev, resp.name, GFP_KERNEL);
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if (!data->desc.name)
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return -ENOMEM;
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return 0;
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}
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static int cros_ec_regulator_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct cros_ec_regulator_data *drvdata;
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struct regulator_init_data *init_data;
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struct regulator_config cfg = {};
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struct regulator_desc *desc;
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int ret;
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drvdata = devm_kzalloc(
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&pdev->dev, sizeof(struct cros_ec_regulator_data), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->ec_dev = dev_get_drvdata(dev->parent);
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desc = &drvdata->desc;
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init_data = of_get_regulator_init_data(dev, np, desc);
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if (!init_data)
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return -EINVAL;
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ret = of_property_read_u32(np, "reg", &drvdata->index);
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if (ret < 0)
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return ret;
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desc->owner = THIS_MODULE;
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desc->type = REGULATOR_VOLTAGE;
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desc->ops = &cros_ec_regulator_voltage_ops;
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ret = cros_ec_regulator_init_info(dev, drvdata);
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if (ret < 0)
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return ret;
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cfg.dev = &pdev->dev;
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cfg.init_data = init_data;
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cfg.driver_data = drvdata;
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cfg.of_node = np;
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drvdata->dev = devm_regulator_register(dev, &drvdata->desc, &cfg);
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if (IS_ERR(drvdata->dev)) {
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ret = PTR_ERR(drvdata->dev);
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dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
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goto free_name;
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}
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platform_set_drvdata(pdev, drvdata);
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return 0;
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free_name:
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kfree(desc->name);
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return ret;
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}
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static const struct of_device_id regulator_cros_ec_of_match[] = {
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{ .compatible = "google,cros-ec-regulator", },
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{}
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};
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MODULE_DEVICE_TABLE(of, regulator_cros_ec_of_match);
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static struct platform_driver cros_ec_regulator_driver = {
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.probe = cros_ec_regulator_probe,
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.driver = {
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.name = "cros-ec-regulator",
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.of_match_table = regulator_cros_ec_of_match,
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},
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};
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module_platform_driver(cros_ec_regulator_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("ChromeOS EC controlled regulator");
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MODULE_AUTHOR("Pi-Hsun Shih <pihsun@chromium.org>");
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