3 files changed, 176 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index af80928a46b4..f6002a76c29f 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 && OF
+        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 d7fc17f11d77..829de43a2427 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_INPUT_RB532_BUTTON)	+= rb532_button.o
 obj-$(CONFIG_INPUT_RETU_PWRBUTTON)      += retu-pwrbutton.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
 obj-$(CONFIG_INPUT_SGI_BTNS)            += sgi_btns.o
+obj-$(CONFIG_INPUT_SIRFSOC_ONKEY)       += sirfsoc-onkey.o
 obj-$(CONFIG_INPUT_SPARCSPKR)           += sparcspkr.o
 obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON)   += twl4030-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_VIBRA)       += twl4030-vibra.o
diff --git a/drivers/input/misc/sirfsoc-onkey.c b/drivers/input/misc/sirfsoc-onkey.c
new file mode 100644
index 000000000000..0621c367049a
--- /dev/null
+++ b/drivers/input/misc/sirfsoc-onkey.c
@@ -0,0 +1,165 @@
+/*
+ * 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;
+        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 = 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)
+{
+        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_PWR);
+
+        irq = platform_get_irq(pdev, 0);
+        error = devm_request_irq(&pdev->dev, irq,
+                                 sirfsoc_pwrc_isr, IRQF_SHARED,
+                                 "sirfsoc_pwrc_int", pwrcdrv);
+        if (error) {
+                dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
+                        irq, error);
+                return error;
+        }
+
+        sirfsoc_rtc_iobrg_writel(
+                sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK) |
+                        PWRC_ON_KEY_BIT,
+                pwrcdrv->pwrc_base + PWRC_INT_MASK);
+
+        error = input_register_device(pwrcdrv->input);
+        if (error) {
+                dev_err(&pdev->dev,
+                        "unable to register input device, error: %d\n",
+                        error);
+                return error;
+        }
+
+        platform_set_drvdata(pdev, pwrcdrv);
+        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_SLEEP
+static int pwrc_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct sirfsoc_pwrc_drvdata *pwrcdrv = platform_get_drvdata(pdev);
+
+        /*
+         * 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;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, pwrc_resume);
+
+static struct platform_driver sirfsoc_pwrc_driver = {
+        .probe          = sirfsoc_pwrc_probe,
+        .remove         = sirfsoc_pwrc_remove,
+        .driver         = {
+                .name   = "sirfsoc-pwrc",
+                .owner  = THIS_MODULE,
+                .pm     = &sirfsoc_pwrc_pm_ops,
+                .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@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
+MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
+MODULE_ALIAS("platform:sirfsoc-pwrc");