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255 lines
6.4 KiB
255 lines
6.4 KiB
// 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 const 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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if (!data->voltages_mV) |
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return -ENOMEM; |
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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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dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
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return PTR_ERR(drvdata->dev); |
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} |
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platform_set_drvdata(pdev, drvdata); |
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return 0; |
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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 <[email protected]>");
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