141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2024 Linaro Ltd.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/pci-pwrctrl.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/pwrseq/consumer.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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struct pwrseq_pwrctrl {
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struct pci_pwrctrl pwrctrl;
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struct pwrseq_desc *pwrseq;
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};
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struct pwrseq_pwrctrl_pdata {
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const char *target;
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/*
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* Called before doing anything else to perform device-specific
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* verification between requesting the power sequencing handle.
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*/
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int (*validate_device)(struct device *dev);
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};
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static int pwrseq_pwrctrl_qcm_wcn_validate_device(struct device *dev)
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{
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/*
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* Old device trees for some platforms already define wifi nodes for
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* the WCN family of chips since before power sequencing was added
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* upstream.
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*
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* These nodes don't consume the regulator outputs from the PMU, and
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* if we allow this driver to bind to one of such "incomplete" nodes,
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* we'll see a kernel log error about the indefinite probe deferral.
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*
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* Check the existence of the regulator supply that exists on all
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* WCN models before moving forward.
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*/
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if (!device_property_present(dev, "vddaon-supply"))
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return -ENODEV;
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return 0;
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}
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static const struct pwrseq_pwrctrl_pdata pwrseq_pwrctrl_qcom_wcn_pdata = {
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.target = "wlan",
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.validate_device = pwrseq_pwrctrl_qcm_wcn_validate_device,
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};
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static int pwrseq_pwrctrl_power_on(struct pci_pwrctrl *pwrctrl)
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{
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struct pwrseq_pwrctrl *pwrseq = container_of(pwrctrl,
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struct pwrseq_pwrctrl, pwrctrl);
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return pwrseq_power_on(pwrseq->pwrseq);
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}
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static int pwrseq_pwrctrl_power_off(struct pci_pwrctrl *pwrctrl)
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{
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struct pwrseq_pwrctrl *pwrseq = container_of(pwrctrl,
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struct pwrseq_pwrctrl, pwrctrl);
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return pwrseq_power_off(pwrseq->pwrseq);
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}
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static int pwrseq_pwrctrl_probe(struct platform_device *pdev)
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{
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const struct pwrseq_pwrctrl_pdata *pdata;
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struct pwrseq_pwrctrl *pwrseq;
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struct device *dev = &pdev->dev;
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int ret;
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pdata = device_get_match_data(dev);
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if (!pdata || !pdata->target)
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return -EINVAL;
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if (pdata->validate_device) {
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ret = pdata->validate_device(dev);
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if (ret)
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return ret;
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}
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pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
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if (!pwrseq)
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return -ENOMEM;
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pwrseq->pwrseq = devm_pwrseq_get(dev, pdata->target);
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if (IS_ERR(pwrseq->pwrseq))
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return dev_err_probe(dev, PTR_ERR(pwrseq->pwrseq),
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"Failed to get the power sequencer\n");
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pwrseq->pwrctrl.power_on = pwrseq_pwrctrl_power_on;
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pwrseq->pwrctrl.power_off = pwrseq_pwrctrl_power_off;
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pci_pwrctrl_init(&pwrseq->pwrctrl, dev);
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ret = devm_pci_pwrctrl_device_set_ready(dev, &pwrseq->pwrctrl);
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if (ret)
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return dev_err_probe(dev, ret,
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"Failed to register the pwrctrl wrapper\n");
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return 0;
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}
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static const struct of_device_id pwrseq_pwrctrl_of_match[] = {
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{
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/* ATH11K in QCA6390 package. */
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.compatible = "pci17cb,1101",
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.data = &pwrseq_pwrctrl_qcom_wcn_pdata,
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},
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{
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/* ATH11K in WCN6855 package. */
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.compatible = "pci17cb,1103",
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.data = &pwrseq_pwrctrl_qcom_wcn_pdata,
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},
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{
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/* ATH12K in WCN7850 package. */
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.compatible = "pci17cb,1107",
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.data = &pwrseq_pwrctrl_qcom_wcn_pdata,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, pwrseq_pwrctrl_of_match);
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static struct platform_driver pwrseq_pwrctrl_driver = {
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.driver = {
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.name = "pci-pwrctrl-pwrseq",
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.of_match_table = pwrseq_pwrctrl_of_match,
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},
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.probe = pwrseq_pwrctrl_probe,
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};
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module_platform_driver(pwrseq_pwrctrl_driver);
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MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>");
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MODULE_DESCRIPTION("Generic PCI Power Control module for power sequenced devices");
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MODULE_LICENSE("GPL");
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