From: Binghua Duan <Binghua.Duan@xxxxxxx>
there is an embedded PWRC(power controller) in SiRFprimaII and SiRFatlasVI,
we have an ONKEY button which can generate interrupt to IRQ controller.
in a typical user scenarios, at the runtime, if users touch the key, we put
system to s2ram status.
Signed-off-by: Binghua Duan <Binghua.Duan@xxxxxxx>
Signed-off-by: Xianglong Du <Xianglong.Du@xxxxxxx>
Signed-off-by: Barry Song <Baohua.Song@xxxxxxx>
---
drivers/input/misc/Kconfig | 10 +++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/sirfsoc_onkey.c | 176 +++++++++++++++++++++++++++++++++++++
3 files changed, 187 insertions(+)
create mode 100644 drivers/input/misc/sirfsoc_onkey.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index bb698e1..1d91d1b 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -637,4 +637,14 @@ config INPUT_XEN_KBDDEV_FRONTEND
To compile this driver as a module, choose M here: the
module will be called xen-kbdfront.
+config INPUT_SIRFSOC_ONKEY
+ bool "CSR SiRFSoC power on/off/suspend key support"
+ depends on ARCH_SIRF
+ default y
+ help
+ Say Y here if you want to support for the SiRFSoC power on/off/suspend key
+ in Linux, after you press the onkey, system will suspend.
+
+ If unsure, say N.
+
endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index d7fc17f..1d66f03 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -60,3 +60,4 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND) += xen-kbdfront.o
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
+obj-$(CONFIG_INPUT_SIRFSOC_ONKEY) += sirfsoc_onkey.o
diff --git a/drivers/input/misc/sirfsoc_onkey.c b/drivers/input/misc/sirfsoc_onkey.c
new file mode 100644
index 0000000..3e48db9
--- /dev/null
+++ b/drivers/input/misc/sirfsoc_onkey.c
@@ -0,0 +1,176 @@
+/*
+ * Power key driver for SiRF PrimaII
+ *
+ * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/init.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>
+
+struct sirfsoc_pwrc_drvdata {
+ u32 pwrc_base;
+ int irq;
+ struct input_dev *input;
+};
+
+#define PWRC_ON_KEY_BIT (1 << 0)
+
+#define PWRC_INT_STATUS 0xc
+#define PWRC_INT_MASK 0x10
+
+static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
+{
+ struct sirfsoc_pwrc_drvdata *pwrcdrv =
+ (struct sirfsoc_pwrc_drvdata *)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);
+
+ /*
+ * For a typical Linux system, we report KEY_SUSPEND to trigger apm-power.c
+ * to queue a SUSPEND APM event
+ */
+ input_event(pwrcdrv->input, EV_PWR, KEY_SUSPEND, 1);
+ input_sync(pwrcdrv->input);
+
+ /*
+ * Todo: report KEY_POWER event for Android platforms, Android PowerManager
+ * will handle the suspend and powerdown/hibernation
+ */
+
+ return IRQ_HANDLED;
+}
+
+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)
+{
+ int ret;
+ struct sirfsoc_pwrc_drvdata *pwrcdrv = NULL;
+ struct device_node *np = pdev->dev.of_node;
+
+ pwrcdrv = devm_kzalloc(&pdev->dev,
+ sizeof(struct sirfsoc_pwrc_drvdata), GFP_KERNEL);
+ if (!pwrcdrv) {
+ dev_info(&pdev->dev, "kzalloc fail!\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
+ */
+ ret = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to find base address of pwrc node in dtb\n");
+ return ret;
+ }
+
+ pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
+ if (!pwrcdrv->input)
+ return -ENOMEM;
+
+ pwrcdrv->input->name = "sirfsoc pwrckey";
+ pwrcdrv->input->phys = "pwrc/input0";
+
+ platform_set_drvdata(pdev, pwrcdrv);
+
+ pwrcdrv->irq = platform_get_irq(pdev, 0);
+ ret = devm_request_irq(&pdev->dev, pwrcdrv->irq,
+ sirfsoc_pwrc_isr, IRQF_SHARED,
+ "sirfsoc_pwrc_int", pwrcdrv);
+
+ sirfsoc_rtc_iobrg_writel(
+ sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK)
+ | PWRC_ON_KEY_BIT, pwrcdrv->pwrc_base + PWRC_INT_MASK);
+ if (ret) {
+ dev_err(&pdev->dev, "pwrc: Unable to claim irq %d; error %d\n",
+ pwrcdrv->irq, ret);
+ return ret;
+ }
+
+ pwrcdrv->input->evbit[0] = BIT_MASK(EV_PWR) | BIT_MASK(EV_KEY);
+ set_bit(KEY_POWER, pwrcdrv->input->keybit);
+
+ ret = input_register_device(pwrcdrv->input);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "pwrc: Unable to register input device,error: %d\n",
+ ret);
+ return ret;
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ return 0;
+}
+
+static int sirfsoc_pwrc_remove(struct platform_device *pdev)
+{
+ device_init_wakeup(&pdev->dev, 0);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int pwrc_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int pwrc_resume(struct device *dev)
+{
+ struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_get_drvdata(dev);
+
+ /*
+ * 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
+ */
+ sirfsoc_rtc_iobrg_writel(
+ sirfsoc_rtc_iobrg_readl(
+ pwrcdrv->pwrc_base + PWRC_INT_MASK) | PWRC_ON_KEY_BIT,
+ pwrcdrv->pwrc_base + PWRC_INT_MASK);
+
+ return 0;
+}
+
+static const struct dev_pm_ops sirfsoc_pwrc_pm_ops = {
+ .suspend = pwrc_suspend,
+ .resume = pwrc_resume,
+};
+#endif
+
+static struct platform_driver sirfsoc_pwrc_driver = {
+ .probe = sirfsoc_pwrc_probe,
+ .remove = sirfsoc_pwrc_remove,
+ .driver = {
+ .name = "sirfsoc-pwrc",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &sirfsoc_pwrc_pm_ops,
+#endif
+ .of_match_table = of_match_ptr(sirfsoc_pwrc_of_match),
+ }
+};
+
+module_platform_driver(sirfsoc_pwrc_driver);
+
+MODULE_LICENSE("GPLv2");
+MODULE_AUTHOR("Binghua Duan <Binghua.Duan@xxxxxxx>, "
+ "Xianglong Du <Xianglong.Du@xxxxxxx>");
+MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
+MODULE_ALIAS("platform:sirfsoc-pwrc");
--
1.8.2.3
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