3 files changed, 239 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 4cd94fd6cbad..82a8fb50afac 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -401,6 +401,17 @@ config KEYBOARD_MPR121
           To compile this driver as a module, choose M here: the
           module will be called mpr121_touchkey.
 
+config KEYBOARD_SNVS_PWRKEY
+        tristate "IMX SNVS Power Key Driver"
+        depends on SOC_IMX6SX
+        depends on OF
+        help
+          This is the snvs powerkey driver for the Freescale i.MX application
+          processors that are newer than i.MX6 SX.
+
+          To compile this driver as a module, choose M here; the
+          module will be called snvs_pwrkey.
+
 config KEYBOARD_IMX
         tristate "IMX keypad support"
         depends on ARCH_MXC
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index df28d5553c05..1d416ddf84e4 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_KEYBOARD_QT1070)           += qt1070.o
 obj-$(CONFIG_KEYBOARD_QT2160)           += qt2160.o
 obj-$(CONFIG_KEYBOARD_SAMSUNG)          += samsung-keypad.o
 obj-$(CONFIG_KEYBOARD_SH_KEYSC)         += sh_keysc.o
+obj-$(CONFIG_KEYBOARD_SNVS_PWRKEY)      += snvs_pwrkey.o
 obj-$(CONFIG_KEYBOARD_SPEAR)            += spear-keyboard.o
 obj-$(CONFIG_KEYBOARD_STMPE)            += stmpe-keypad.o
 obj-$(CONFIG_KEYBOARD_STOWAWAY)         += stowaway.o
diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
new file mode 100644
index 000000000000..512a1fc2a864
--- /dev/null
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -0,0 +1,227 @@
+/*
+ * Driver for the IMX SNVS ON/OFF Power Key
+ * Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#define SNVS_LPSR_REG   0x4C    /* LP Status Register */
+#define SNVS_LPCR_REG   0x38    /* LP Control Register */
+#define SNVS_HPSR_REG   0x14
+#define SNVS_HPSR_BTN   BIT(6)
+#define SNVS_LPSR_SPO   BIT(18)
+#define SNVS_LPCR_DEP_EN BIT(5)
+
+#define DEBOUNCE_TIME 30
+#define REPEAT_INTERVAL 60
+
+struct pwrkey_drv_data {
+        struct regmap *snvs;
+        int irq;
+        int keycode;
+        int keystate;  /* 1:pressed */
+        int wakeup;
+        struct timer_list check_timer;
+        struct input_dev *input;
+};
+
+static void imx_imx_snvs_check_for_events(unsigned long data)
+{
+        struct pwrkey_drv_data *pdata = (struct pwrkey_drv_data *) data;
+        struct input_dev *input = pdata->input;
+        u32 state;
+
+        regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
+        state = state & SNVS_HPSR_BTN ? 1 : 0;
+
+        /* only report new event if status changed */
+        if (state ^ pdata->keystate) {
+                pdata->keystate = state;
+                input_event(input, EV_KEY, pdata->keycode, state);
+                input_sync(input);
+                pm_relax(pdata->input->dev.parent);
+        }
+
+        /* repeat check if pressed long */
+        if (state) {
+                mod_timer(&pdata->check_timer,
+                          jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
+        }
+}
+
+static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
+{
+        struct platform_device *pdev = dev_id;
+        struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
+        u32 lp_status;
+
+        pm_wakeup_event(pdata->input->dev.parent, 0);
+
+        regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
+        if (lp_status & SNVS_LPSR_SPO)
+                mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
+
+        /* clear SPO status */
+        regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
+
+        return IRQ_HANDLED;
+}
+
+static void imx_snvs_pwrkey_act(void *pdata)
+{
+        struct pwrkey_drv_data *pd = pdata;
+
+        del_timer_sync(&pd->check_timer);
+}
+
+static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
+{
+        struct pwrkey_drv_data *pdata = NULL;
+        struct input_dev *input = NULL;
+        struct device_node *np;
+        int error;
+
+        /* Get SNVS register Page */
+        np = pdev->dev.of_node;
+        if (!np)
+                return -ENODEV;
+
+        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return -ENOMEM;
+
+        pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");;
+
+        if (!pdata->snvs) {
+                dev_err(&pdev->dev, "Can't get snvs syscon\n");
+                return -ENODEV;
+        }
+
+        if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
+                pdata->keycode = KEY_POWER;
+                dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
+        }
+
+        pdata->wakeup = of_property_read_bool(np, "wakeup");
+
+        pdata->irq = platform_get_irq(pdev, 0);
+        if (pdata->irq < 0) {
+                dev_err(&pdev->dev, "no irq defined in platform data\n");
+                return -EINVAL;
+        }
+
+        regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
+
+        /* clear the unexpected interrupt before driver ready */
+        regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
+
+        setup_timer(&pdata->check_timer,
+                    imx_imx_snvs_check_for_events, (unsigned long) pdata);
+
+        input = devm_input_allocate_device(&pdev->dev);
+        if (!input) {
+                dev_err(&pdev->dev, "failed to allocate the input device\n");
+                return -ENOMEM;
+        }
+
+        input->name = pdev->name;
+        input->phys = "snvs-pwrkey/input0";
+        input->id.bustype = BUS_HOST;
+
+        input_set_capability(input, EV_KEY, pdata->keycode);
+
+        /* input customer action to cancel release timer */
+        error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
+        if (error) {
+                dev_err(&pdev->dev, "failed to register remove action\n");
+                return error;
+        }
+
+        error = devm_request_irq(&pdev->dev, pdata->irq,
+                               imx_snvs_pwrkey_interrupt,
+                               0, pdev->name, pdev);
+
+        if (error) {
+                dev_err(&pdev->dev, "interrupt not available.\n");
+                return error;
+        }
+
+        error = input_register_device(input);
+        if (error < 0) {
+                dev_err(&pdev->dev, "failed to register input device\n");