ENGR00306653-2 input: keyboad: snvs_pwrkey: add snvs power key driver

add snvs power key driver since ic team has fix some issues of SNVS on i.mx6sx

Signed-off-by: Robin Gong <b38343@freescale.com>

4 files changed, 255 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/snvs-pwrkey.txt b/Documentation/devicetree/bindings/input/snvs-pwrkey.txt
new file mode 100644
index 000000000000..8f0826f5817f
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/snvs-pwrkey.txt
@@ -0,0 +1,26 @@
+* Freescale i.MX SNVS powerkey device tree bindings
+
+The snvs-pwrkey is designed to enable POWER key function which controlled
+by SNVS ONOFF, the driver can report the status of POWER key and wakeup
+system if pressed after system suspend.
+
+Required SoC Specific Properties:
+- compatible: Should be "fsl,imx6sx-snvs-pwrkey".
+
+- reg: Physical base address of the SNVS and length of memory mapped
+  region.
+
+- interrupts: The SNVS interrupt number to the CPU(s).
+
+- fsl,keycode: Keycode to emit, KEY_POWER by default.
+
+- fsl,wakeup: Button can wake-up the system
+
+Example:
+snvs-pwrkey@0x020cc000 {
+        compatible = "fsl,imx6sx-snvs-pwrkey";
+        reg = <0x020cc000 0x4000>;
+        interrupts = <0 4 0x4>;
+        fsl,keycode = <116>; /* KEY_POWER */
+        fsl,wakeup;
+};
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 292f3240e67b..c834583539f9 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -388,6 +388,13 @@ 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 "IMX6SX SNVS Power Key Driver"
+        depends on SOC_IMX6SX
+        help
+          This is the snvs powerkey driver for the Freescale i.MX6SX application
+          processors.
+
 config KEYBOARD_IMX
         tristate "IMX keypad support"
         depends on ARCH_MXC
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 0c43e8cf8d0e..7b5379ffbc55 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -46,6 +46,7 @@ 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..f00c21290afd
--- /dev/null
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2011-2014 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>
+
+#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   (0x1 << 6)
+#define SNVS_LPSR_SPO   (0x1 << 18)
+#define SNVS_LPCR_DEP_EN (0x1 << 5)
+
+struct pwrkey_drv_data {
+        void __iomem *ioaddr;
+        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;
+        void __iomem *ioaddr = pdata->ioaddr;
+        u32 state;
+
+        state = ((readl_relaxed(ioaddr + SNVS_HPSR_REG) & 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);
+        }
+
+        /* repeat check if pressed long */
+        if (state) {
+                mod_timer(&pdata->check_timer,
+                          jiffies + msecs_to_jiffies(60));
+        }
+}
+
+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);
+        void __iomem *ioaddr = pdata->ioaddr;
+        u32 lp_status;
+
+        lp_status = readl_relaxed(ioaddr + SNVS_LPSR_REG);
+        if (lp_status & SNVS_LPSR_SPO)
+                mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(2));
+
+        /* clear SPO status */
+        writel_relaxed(lp_status, ioaddr + SNVS_LPSR_REG);
+
+        return IRQ_HANDLED;
+}
+
+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;
+        void __iomem *ioaddr;
+        u32 lp_cr;
+        int ret = 0;
+
+        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return -ENOMEM;
+
+        /* Get SNVS register Page */
+        np = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-snvs-pwrkey");
+        if (!np)
+                return -ENODEV;
+        pdata->ioaddr = of_iomap(np, 0);
+        if (IS_ERR(pdata->ioaddr))
+                return PTR_ERR(pdata->ioaddr);
+
+        if (of_property_read_u32(np, "fsl,keycode", &pdata->keycode)) {
+                pdata->keycode = KEY_POWER;
+                dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
+        }
+
+        pdata->wakeup = !!of_get_property(np, "fsl,wakeup", NULL);
+
+        ioaddr = pdata->ioaddr;
+        pdata->irq = platform_get_irq(pdev, 0);
+        if (pdata->irq < 0) {
+                dev_err(&pdev->dev, "no irq defined in platform data\n");
+                return -EINVAL;
+        }
+
+        ioaddr = pdata->ioaddr;
+        lp_cr = readl_relaxed(ioaddr + SNVS_LPCR_REG);
+        lp_cr |= SNVS_LPCR_DEP_EN,
+        writel_relaxed(lp_cr, ioaddr + SNVS_LPCR_REG);
+
+        setup_timer(&pdata->check_timer,
+                    imx_imx_snvs_check_for_events, (unsigned long) pdata);
+
+        if (pdata->irq >= 0) {
+                ret = devm_request_irq(&pdev->dev, pdata->irq,
+                                        imx_snvs_pwrkey_interrupt,
+                                        IRQF_TRIGGER_HIGH, pdev->name, pdev);
+                if (ret) {
+                        dev_err(&pdev->dev, "interrupt not available.\n");
+                        return ret;
+                }
+        }
+
+        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->evbit[0] = BIT_MASK(EV_KEY);
+
+        input_set_capability(input, EV_KEY, pdata->keycode);
+
+        ret = input_register_device(input);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to register input device\n");
+                input_free_device(input);
+                return ret;
+        }
+
+        pdata->input = input;
+        platform_set_drvdata(pdev, pdata);
+
+        device_init_wakeup(&pdev->dev, pdata->wakeup);
+
+        dev_info(&pdev->dev, "i.MX snvs powerkey probed\n");
+
+        return 0;
+}
+
+static int imx_snvs_pwrkey_remove(struct platform_device *pdev)
+{
+        struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
+
+        input_unregister_device(pdata->input);
+        del_timer_sync(&pdata->check_timer);
+
+        return 0;
+}
+
+static int imx_snvs_pwrkey_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(&pdev->dev))
+                enable_irq_wake(pdata->irq);
+
+        return 0;
+}
+
+static int imx_snvs_pwrkey_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(&pdev->dev))
+                disable_irq_wake(pdata->irq);
+
+        return 0;
+}
+
+static const struct of_device_id imx_snvs_pwrkey_ids[] = {
+        { .compatible = "fsl,imx6sx-snvs-pwrkey" },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
+
+static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend,
+                                imx_snvs_pwrkey_resume);
+
+static struct platform_driver imx_snvs_pwrkey_driver = {
+        .driver = {
+                .name = "snvs_pwrkey",
+                .owner  = THIS_MODULE,
+                .pm     = &imx_snvs_pwrkey_pm_ops,
+                .of_match_table = imx_snvs_pwrkey_ids,
+        },
+        .probe = imx_snvs_pwrkey_probe,
+        .remove = imx_snvs_pwrkey_remove,
+};
+module_platform_driver(imx_snvs_pwrkey_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor");
+MODULE_DESCRIPTION("i.MX snvs power key Driver");
+MODULE_LICENSE("GPL");