166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/*
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* Power key driver for SiRF PrimaII
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*
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* Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
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*
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* Licensed under GPLv2 or later.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/rtc/sirfsoc_rtciobrg.h>
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#include <linux/of.h>
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struct sirfsoc_pwrc_drvdata {
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u32 pwrc_base;
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struct input_dev *input;
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};
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#define PWRC_ON_KEY_BIT (1 << 0)
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#define PWRC_INT_STATUS 0xc
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#define PWRC_INT_MASK 0x10
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static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
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{
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struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
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u32 int_status;
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int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
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PWRC_INT_STATUS);
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sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
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pwrcdrv->pwrc_base + PWRC_INT_STATUS);
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/*
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* For a typical Linux system, we report KEY_SUSPEND to trigger apm-power.c
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* to queue a SUSPEND APM event
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*/
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input_event(pwrcdrv->input, EV_PWR, KEY_SUSPEND, 1);
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input_sync(pwrcdrv->input);
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/*
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* Todo: report KEY_POWER event for Android platforms, Android PowerManager
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* will handle the suspend and powerdown/hibernation
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*/
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return IRQ_HANDLED;
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}
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static const struct of_device_id sirfsoc_pwrc_of_match[] = {
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{ .compatible = "sirf,prima2-pwrc" },
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{},
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}
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MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
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static int sirfsoc_pwrc_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct sirfsoc_pwrc_drvdata *pwrcdrv;
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int irq;
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int error;
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pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
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GFP_KERNEL);
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if (!pwrcdrv) {
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dev_info(&pdev->dev, "Not enough memory for the device data\n");
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return -ENOMEM;
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}
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/*
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* we can't use of_iomap because pwrc is not mapped in memory,
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* the so-called base address is only offset in rtciobrg
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*/
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error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
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if (error) {
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dev_err(&pdev->dev,
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"unable to find base address of pwrc node in dtb\n");
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return error;
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}
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pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
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if (!pwrcdrv->input)
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return -ENOMEM;
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pwrcdrv->input->name = "sirfsoc pwrckey";
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pwrcdrv->input->phys = "pwrc/input0";
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pwrcdrv->input->evbit[0] = BIT_MASK(EV_PWR);
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irq = platform_get_irq(pdev, 0);
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error = devm_request_irq(&pdev->dev, irq,
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sirfsoc_pwrc_isr, IRQF_SHARED,
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"sirfsoc_pwrc_int", pwrcdrv);
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if (error) {
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dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
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irq, error);
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return error;
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}
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sirfsoc_rtc_iobrg_writel(
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sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK) |
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PWRC_ON_KEY_BIT,
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pwrcdrv->pwrc_base + PWRC_INT_MASK);
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error = input_register_device(pwrcdrv->input);
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if (error) {
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dev_err(&pdev->dev,
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"unable to register input device, error: %d\n",
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error);
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return error;
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}
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platform_set_drvdata(pdev, pwrcdrv);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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}
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static int sirfsoc_pwrc_remove(struct platform_device *pdev)
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{
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device_init_wakeup(&pdev->dev, 0);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int pwrc_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct sirfsoc_pwrc_drvdata *pwrcdrv = platform_get_drvdata(pdev);
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/*
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* Do not mask pwrc interrupt as we want pwrc work as a wakeup source
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* if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
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*/
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sirfsoc_rtc_iobrg_writel(
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sirfsoc_rtc_iobrg_readl(
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pwrcdrv->pwrc_base + PWRC_INT_MASK) | PWRC_ON_KEY_BIT,
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pwrcdrv->pwrc_base + PWRC_INT_MASK);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, pwrc_resume);
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static struct platform_driver sirfsoc_pwrc_driver = {
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.probe = sirfsoc_pwrc_probe,
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.remove = sirfsoc_pwrc_remove,
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.driver = {
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.name = "sirfsoc-pwrc",
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.owner = THIS_MODULE,
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.pm = &sirfsoc_pwrc_pm_ops,
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.of_match_table = of_match_ptr(sirfsoc_pwrc_of_match),
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}
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};
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module_platform_driver(sirfsoc_pwrc_driver);
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MODULE_LICENSE("GPLv2");
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MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
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MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
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MODULE_ALIAS("platform:sirfsoc-pwrc");
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