133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014-2019, The Linux Foundation. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/suspend.h>
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#include <linux/platform_device.h>
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#include <linux/soc/qcom/smem_state.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/of_irq.h>
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#include <linux/of.h>
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#include <linux/pm_wakeup.h>
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#define PROC_AWAKE_ID 12 /* 12th bit */
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#define AWAKE_BIT BIT(PROC_AWAKE_ID)
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static struct qcom_smem_state *state;
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static struct wakeup_source *notify_ws;
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/**
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* sleepstate_pm_notifier() - PM notifier callback function.
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* @nb: Pointer to the notifier block.
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* @event: Suspend state event from PM module.
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* @unused: Null pointer from PM module.
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*
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* This function is register as callback function to get notifications
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* from the PM module on the system suspend state.
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*/
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static int sleepstate_pm_notifier(struct notifier_block *nb,
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unsigned long event, void *unused)
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{
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switch (event) {
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case PM_SUSPEND_PREPARE:
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qcom_smem_state_update_bits(state, AWAKE_BIT, 0);
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break;
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case PM_POST_SUSPEND:
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qcom_smem_state_update_bits(state, AWAKE_BIT, AWAKE_BIT);
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block sleepstate_pm_nb = {
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.notifier_call = sleepstate_pm_notifier,
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.priority = INT_MAX,
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};
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static irqreturn_t smp2p_sleepstate_handler(int irq, void *ctxt)
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{
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__pm_wakeup_event(notify_ws, 100);
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return IRQ_HANDLED;
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}
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static int smp2p_sleepstate_probe(struct platform_device *pdev)
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{
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int ret;
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int irq;
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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state = qcom_smem_state_get(&pdev->dev, 0, &ret);
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if (IS_ERR(state))
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return PTR_ERR(state);
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qcom_smem_state_update_bits(state, AWAKE_BIT, AWAKE_BIT);
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ret = register_pm_notifier(&sleepstate_pm_nb);
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if (ret) {
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dev_err(dev, "%s: power state notif error %d\n", __func__, ret);
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return ret;
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}
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notify_ws = wakeup_source_register(&pdev->dev, "smp2p-sleepstate");
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if (!notify_ws) {
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return -ENOMEM;
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goto err_ws;
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}
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irq = of_irq_get_byname(node, "smp2p-sleepstate-in");
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if (irq <= 0) {
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dev_err(dev, "failed to get irq for smp2p_sleep_state\n");
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ret = -EPROBE_DEFER;
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goto err;
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}
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dev_dbg(dev, "got smp2p-sleepstate-in irq %d\n", irq);
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ret = devm_request_threaded_irq(dev, irq, NULL,
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smp2p_sleepstate_handler,
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IRQF_ONESHOT | IRQF_TRIGGER_RISING,
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"smp2p_sleepstate", dev);
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if (ret) {
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dev_err(dev, "fail to register smp2p threaded_irq=%d\n", irq);
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goto err;
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}
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return 0;
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err:
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wakeup_source_unregister(notify_ws);
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__pm_relax(notify_ws);
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err_ws:
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unregister_pm_notifier(&sleepstate_pm_nb);
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return ret;
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}
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static const struct of_device_id smp2p_slst_match_table[] = {
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{.compatible = "qcom,smp2p-sleepstate"},
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{},
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};
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static struct platform_driver smp2p_sleepstate_driver = {
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.probe = smp2p_sleepstate_probe,
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.driver = {
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.name = "smp2p_sleepstate",
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.of_match_table = smp2p_slst_match_table,
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},
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};
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static int __init smp2p_sleepstate_init(void)
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{
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int ret;
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ret = platform_driver_register(&smp2p_sleepstate_driver);
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if (ret) {
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pr_err("%s: register failed %d\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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module_init(smp2p_sleepstate_init);
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MODULE_DESCRIPTION("SMP2P SLEEP STATE");
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MODULE_LICENSE("GPL v2");
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