104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/suspend.h>
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#include "smp2p_private.h"
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#define SET_DELAY (2 * HZ)
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#define PROC_AWAKE_ID 12 /* 12th bit */
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static int slst_gpio_base_id;
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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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gpio_set_value(slst_gpio_base_id + PROC_AWAKE_ID, 0);
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break;
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case PM_POST_SUSPEND:
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gpio_set_value(slst_gpio_base_id + PROC_AWAKE_ID, 1);
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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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};
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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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struct device_node *node = pdev->dev.of_node;
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slst_gpio_base_id = of_get_gpio(node, 0);
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if (slst_gpio_base_id == -EPROBE_DEFER) {
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return slst_gpio_base_id;
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} else if (slst_gpio_base_id < 0) {
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SMP2P_ERR("%s: Error to get gpio %d\n",
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__func__, slst_gpio_base_id);
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return slst_gpio_base_id;
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}
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gpio_set_value(slst_gpio_base_id + PROC_AWAKE_ID, 1);
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ret = register_pm_notifier(&sleepstate_pm_nb);
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if (ret)
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SMP2P_ERR("%s: power state notif error %d\n", __func__, ret);
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return 0;
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}
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static struct of_device_id msm_smp2p_slst_match_table[] = {
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{.compatible = "qcom,smp2pgpio_sleepstate_3_out"},
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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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.owner = THIS_MODULE,
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.of_match_table = msm_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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SMP2P_ERR("%s: smp2p_sleepstate_driver register failed %d\n",
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__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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