LXR linux/drivers/input/misc/sirfsoc-onkey.c

   1/*
   2 * Power key driver for SiRF PrimaII
   3 *
   4 * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
   5 *
   6 * Licensed under GPLv2 or later.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/init.h>
  11#include <linux/interrupt.h>
  12#include <linux/delay.h>
  13#include <linux/platform_device.h>
  14#include <linux/input.h>
  15#include <linux/rtc/sirfsoc_rtciobrg.h>
  16#include <linux/of.h>
  17
  18struct sirfsoc_pwrc_drvdata {
  19        u32                     pwrc_base;
  20        struct input_dev        *input;
  21};
  22
  23#define PWRC_ON_KEY_BIT                 (1 << 0)
  24
  25#define PWRC_INT_STATUS                 0xc
  26#define PWRC_INT_MASK                   0x10
  27
  28static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
  29{
  30        struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
  31        u32 int_status;
  32
  33        int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
  34                                                        PWRC_INT_STATUS);
  35        sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
  36                                 pwrcdrv->pwrc_base + PWRC_INT_STATUS);
  37
  38        /*
  39         * For a typical Linux system, we report KEY_SUSPEND to trigger apm-power.c
  40         * to queue a SUSPEND APM event
  41         */
  42        input_event(pwrcdrv->input, EV_PWR, KEY_SUSPEND, 1);
  43        input_sync(pwrcdrv->input);
  44
  45        /*
  46         * Todo: report KEY_POWER event for Android platforms, Android PowerManager
  47         * will handle the suspend and powerdown/hibernation
  48         */
  49
  50        return IRQ_HANDLED;
  51}
  52
  53static const struct of_device_id sirfsoc_pwrc_of_match[] = {
  54        { .compatible = "sirf,prima2-pwrc" },
  55        {},
  56}
  57MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
  58
  59static int sirfsoc_pwrc_probe(struct platform_device *pdev)
  60{
  61        struct device_node *np = pdev->dev.of_node;
  62        struct sirfsoc_pwrc_drvdata *pwrcdrv;
  63        int irq;
  64        int error;
  65
  66        pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
  67                               GFP_KERNEL);
  68        if (!pwrcdrv) {
  69                dev_info(&pdev->dev, "Not enough memory for the device data\n");
  70                return -ENOMEM;
  71        }
  72
  73        /*
  74         * we can't use of_iomap because pwrc is not mapped in memory,
  75         * the so-called base address is only offset in rtciobrg
  76         */
  77        error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
  78        if (error) {
  79                dev_err(&pdev->dev,
  80                        "unable to find base address of pwrc node in dtb\n");
  81                return error;
  82        }
  83
  84        pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
  85        if (!pwrcdrv->input)
  86                return -ENOMEM;
  87
  88        pwrcdrv->input->name = "sirfsoc pwrckey";
  89        pwrcdrv->input->phys = "pwrc/input0";
  90        pwrcdrv->input->evbit[0] = BIT_MASK(EV_PWR);
  91
  92        irq = platform_get_irq(pdev, 0);
  93        error = devm_request_irq(&pdev->dev, irq,
  94                                 sirfsoc_pwrc_isr, IRQF_SHARED,
  95                                 "sirfsoc_pwrc_int", pwrcdrv);
  96        if (error) {
  97                dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
  98                        irq, error);
  99                return error;
 100        }
 101
 102        sirfsoc_rtc_iobrg_writel(
 103                sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK) |
 104                        PWRC_ON_KEY_BIT,
 105                pwrcdrv->pwrc_base + PWRC_INT_MASK);
 106
 107        error = input_register_device(pwrcdrv->input);
 108        if (error) {
 109                dev_err(&pdev->dev,
 110                        "unable to register input device, error: %d\n",
 111                        error);
 112                return error;
 113        }
 114
 115        platform_set_drvdata(pdev, pwrcdrv);
 116        device_init_wakeup(&pdev->dev, 1);
 117
 118        return 0;
 119}
 120
 121static int sirfsoc_pwrc_remove(struct platform_device *pdev)
 122{
 123        device_init_wakeup(&pdev->dev, 0);
 124
 125        return 0;
 126}
 127
 128#ifdef CONFIG_PM_SLEEP
 129static int pwrc_resume(struct device *dev)
 130{
 131        struct platform_device *pdev = to_platform_device(dev);
 132        struct sirfsoc_pwrc_drvdata *pwrcdrv = platform_get_drvdata(pdev);
 133
 134        /*
 135         * Do not mask pwrc interrupt as we want pwrc work as a wakeup source
 136         * if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
 137         */
 138        sirfsoc_rtc_iobrg_writel(
 139                sirfsoc_rtc_iobrg_readl(
 140                pwrcdrv->pwrc_base + PWRC_INT_MASK) | PWRC_ON_KEY_BIT,
 141                pwrcdrv->pwrc_base + PWRC_INT_MASK);
 142
 143        return 0;
 144}
 145#endif
 146
 147static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, pwrc_resume);
 148
 149static struct platform_driver sirfsoc_pwrc_driver = {
 150        .probe          = sirfsoc_pwrc_probe,
 151        .remove         = sirfsoc_pwrc_remove,
 152        .driver         = {
 153                .name   = "sirfsoc-pwrc",
 154                .owner  = THIS_MODULE,
 155                .pm     = &sirfsoc_pwrc_pm_ops,
 156                .of_match_table = of_match_ptr(sirfsoc_pwrc_of_match),
 157        }
 158};
 159
 160module_platform_driver(sirfsoc_pwrc_driver);
 161
 162MODULE_LICENSE("GPLv2");
 163MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
 164MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
 165MODULE_ALIAS("platform:sirfsoc-pwrc");
 166