92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2017-18 Linaro Limited
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/reboot-mode.h>
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#include <linux/regmap.h>
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#define PON_SOFT_RB_SPARE 0x8f
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struct pm8916_pon {
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struct device *dev;
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struct regmap *regmap;
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u32 baseaddr;
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struct reboot_mode_driver reboot_mode;
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};
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static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
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unsigned int magic)
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{
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struct pm8916_pon *pon = container_of
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(reboot, struct pm8916_pon, reboot_mode);
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int ret;
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ret = regmap_update_bits(pon->regmap,
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pon->baseaddr + PON_SOFT_RB_SPARE,
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0xfc, magic << 2);
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if (ret < 0)
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dev_err(pon->dev, "update reboot mode bits failed\n");
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return ret;
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}
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static int pm8916_pon_probe(struct platform_device *pdev)
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{
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struct pm8916_pon *pon;
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int error;
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pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
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if (!pon)
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return -ENOMEM;
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pon->dev = &pdev->dev;
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pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!pon->regmap) {
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dev_err(&pdev->dev, "failed to locate regmap\n");
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return -ENODEV;
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}
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error = of_property_read_u32(pdev->dev.of_node, "reg",
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&pon->baseaddr);
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if (error)
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return error;
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pon->reboot_mode.dev = &pdev->dev;
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pon->reboot_mode.write = pm8916_reboot_mode_write;
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error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
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if (error) {
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dev_err(&pdev->dev, "can't register reboot mode\n");
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return error;
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}
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platform_set_drvdata(pdev, pon);
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return devm_of_platform_populate(&pdev->dev);
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}
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static const struct of_device_id pm8916_pon_id_table[] = {
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{ .compatible = "qcom,pm8916-pon" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
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static struct platform_driver pm8916_pon_driver = {
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.probe = pm8916_pon_probe,
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.driver = {
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.name = "pm8916-pon",
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.of_match_table = of_match_ptr(pm8916_pon_id_table),
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},
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};
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module_platform_driver(pm8916_pon_driver);
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MODULE_DESCRIPTION("pm8916 Power On driver");
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MODULE_LICENSE("GPL v2");
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