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>

3 files changed, 229 insertions, 0 deletions

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);