+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Power key driver for SiRF PrimaII
- *
- * Copyright (c) 2013 - 2014 Cambridge Silicon Radio Limited, a CSR plc group
- * company.
- */
-
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/input.h>
-#include <linux/rtc/sirfsoc_rtciobrg.h>
-#include <linux/of.h>
-#include <linux/workqueue.h>
-
-struct sirfsoc_pwrc_drvdata {
- u32 pwrc_base;
- struct input_dev *input;
- struct delayed_work work;
-};
-
-#define PWRC_ON_KEY_BIT (1 << 0)
-
-#define PWRC_INT_STATUS 0xc
-#define PWRC_INT_MASK 0x10
-#define PWRC_PIN_STATUS 0x14
-#define PWRC_KEY_DETECT_UP_TIME 20 /* ms*/
-
-static int sirfsoc_pwrc_is_on_key_down(struct sirfsoc_pwrc_drvdata *pwrcdrv)
-{
- u32 state = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
- PWRC_PIN_STATUS);
- return !(state & PWRC_ON_KEY_BIT); /* ON_KEY is active low */
-}
-
-static void sirfsoc_pwrc_report_event(struct work_struct *work)
-{
- struct sirfsoc_pwrc_drvdata *pwrcdrv =
- container_of(work, struct sirfsoc_pwrc_drvdata, work.work);
-
- if (sirfsoc_pwrc_is_on_key_down(pwrcdrv)) {
- schedule_delayed_work(&pwrcdrv->work,
- msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME));
- } else {
- input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 0);
- input_sync(pwrcdrv->input);
- }
-}
-
-static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
-{
- struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
- u32 int_status;
-
- int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
- PWRC_INT_STATUS);
- sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
- pwrcdrv->pwrc_base + PWRC_INT_STATUS);
-
- input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 1);
- input_sync(pwrcdrv->input);
- schedule_delayed_work(&pwrcdrv->work,
- msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME));
-
- return IRQ_HANDLED;
-}
-
-static void sirfsoc_pwrc_toggle_interrupts(struct sirfsoc_pwrc_drvdata *pwrcdrv,
- bool enable)
-{
- u32 int_mask;
-
- int_mask = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK);
- if (enable)
- int_mask |= PWRC_ON_KEY_BIT;
- else
- int_mask &= ~PWRC_ON_KEY_BIT;
- sirfsoc_rtc_iobrg_writel(int_mask, pwrcdrv->pwrc_base + PWRC_INT_MASK);
-}
-
-static int sirfsoc_pwrc_open(struct input_dev *input)
-{
- struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
-
- sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
-
- return 0;
-}
-
-static void sirfsoc_pwrc_close(struct input_dev *input)
-{
- struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
-
- sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
- cancel_delayed_work_sync(&pwrcdrv->work);
-}
-
-static const struct of_device_id sirfsoc_pwrc_of_match[] = {
- { .compatible = "sirf,prima2-pwrc" },
- {},
-};
-MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
-
-static int sirfsoc_pwrc_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct sirfsoc_pwrc_drvdata *pwrcdrv;
- int irq;
- int error;
-
- pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
- GFP_KERNEL);
- if (!pwrcdrv) {
- dev_info(&pdev->dev, "Not enough memory for the device data\n");
- return -ENOMEM;
- }
-
- /*
- * We can't use of_iomap because pwrc is not mapped in memory,
- * the so-called base address is only offset in rtciobrg
- */
- error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
- if (error) {
- dev_err(&pdev->dev,
- "unable to find base address of pwrc node in dtb\n");
- return error;
- }
-
- pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
- if (!pwrcdrv->input)
- return -ENOMEM;
-
- pwrcdrv->input->name = "sirfsoc pwrckey";
- pwrcdrv->input->phys = "pwrc/input0";
- pwrcdrv->input->evbit[0] = BIT_MASK(EV_KEY);
- input_set_capability(pwrcdrv->input, EV_KEY, KEY_POWER);
-
- INIT_DELAYED_WORK(&pwrcdrv->work, sirfsoc_pwrc_report_event);
-
- pwrcdrv->input->open = sirfsoc_pwrc_open;
- pwrcdrv->input->close = sirfsoc_pwrc_close;
-
- input_set_drvdata(pwrcdrv->input, pwrcdrv);
-
- /* Make sure the device is quiesced */
- sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
-
- irq = platform_get_irq(pdev, 0);
- error = devm_request_irq(&pdev->dev, irq,
- sirfsoc_pwrc_isr, 0,
- "sirfsoc_pwrc_int", pwrcdrv);
- if (error) {
- dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
- irq, error);
- return error;
- }
-
- error = input_register_device(pwrcdrv->input);
- if (error) {
- dev_err(&pdev->dev,
- "unable to register input device, error: %d\n",
- error);
- return error;
- }
-
- dev_set_drvdata(&pdev->dev, pwrcdrv);
- device_init_wakeup(&pdev->dev, 1);
-
- return 0;
-}
-
-static int __maybe_unused sirfsoc_pwrc_resume(struct device *dev)
-{
- struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_get_drvdata(dev);
- struct input_dev *input = pwrcdrv->input;
-
- /*
- * Do not mask pwrc interrupt as we want pwrc work as a wakeup source
- * if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
- */
- mutex_lock(&input->mutex);
- if (input_device_enabled(input))
- sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
- mutex_unlock(&input->mutex);
-
- return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, sirfsoc_pwrc_resume);
-
-static struct platform_driver sirfsoc_pwrc_driver = {
- .probe = sirfsoc_pwrc_probe,
- .driver = {
- .name = "sirfsoc-pwrc",
- .pm = &sirfsoc_pwrc_pm_ops,
- .of_match_table = sirfsoc_pwrc_of_match,
- }
-};
-
-module_platform_driver(sirfsoc_pwrc_driver);
-
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
-MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
-MODULE_ALIAS("platform:sirfsoc-pwrc");
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