input: Add support for Qualcomm PMIC8XXX power key

Add support for PMIC8XXX power key driven over dedicated
KYPD_PWR_N pin.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 243 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index f9cf0881b0e3..45dc6aa62ba4 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -330,6 +330,17 @@ config INPUT_PWM_BEEPER
           To compile this driver as a module, choose M here: the module will be
           called pwm-beeper.
 
+config INPUT_PMIC8XXX_PWRKEY
+        tristate "PMIC8XXX power key support"
+        depends on MFD_PM8XXX
+        help
+          Say Y here if you want support for the PMIC8XXX power key.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called pmic8xxx-pwrkey.
+
 config INPUT_GPIO_ROTARY_ENCODER
         tristate "Rotary encoders connected to GPIO pins"
         depends on GPIOLIB && GENERIC_GPIO
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index e3f7984e6274..38efb2cb182b 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_INPUT_PCF8574)		+= pcf8574_keypad.o
 obj-$(CONFIG_INPUT_PCSPKR)              += pcspkr.o
 obj-$(CONFIG_INPUT_POWERMATE)           += powermate.o
 obj-$(CONFIG_INPUT_PWM_BEEPER)          += pwm-beeper.o
+obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY)     += pmic8xxx-pwrkey.o
 obj-$(CONFIG_INPUT_RB532_BUTTON)        += rb532_button.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
 obj-$(CONFIG_INPUT_SGI_BTNS)            += sgi_btns.o
diff --git a/drivers/input/misc/pmic8xxx-pwrkey.c b/drivers/input/misc/pmic8xxx-pwrkey.c
new file mode 100644
index 000000000000..97e07e786e41
--- /dev/null
+++ b/drivers/input/misc/pmic8xxx-pwrkey.c
@@ -0,0 +1,231 @@
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/log2.h>
+
+#include <linux/mfd/pm8xxx/core.h>
+#include <linux/input/pmic8xxx-pwrkey.h>
+
+#define PON_CNTL_1 0x1C
+#define PON_CNTL_PULL_UP BIT(7)
+#define PON_CNTL_TRIG_DELAY_MASK (0x7)
+
+/**
+ * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
+ * @key_press_irq: key press irq number
+ */
+struct pmic8xxx_pwrkey {
+        struct input_dev *pwr;
+        int key_press_irq;
+};
+
+static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
+{
+        struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
+
+        input_report_key(pwrkey->pwr, KEY_POWER, 1);
+        input_sync(pwrkey->pwr);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
+{
+        struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
+
+        input_report_key(pwrkey->pwr, KEY_POWER, 0);
+        input_sync(pwrkey->pwr);
+
+        return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pmic8xxx_pwrkey_suspend(struct device *dev)
+{
+        struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(pwrkey->key_press_irq);
+
+        return 0;
+}
+
+static int pmic8xxx_pwrkey_resume(struct device *dev)
+{
+        struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(pwrkey->key_press_irq);
+
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
+                pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
+
+static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
+{
+        struct input_dev *pwr;
+        int key_release_irq = platform_get_irq(pdev, 0);
+        int key_press_irq = platform_get_irq(pdev, 1);
+        int err;
+        unsigned int delay;
+        u8 pon_cntl;
+        struct pmic8xxx_pwrkey *pwrkey;
+        const struct pm8xxx_pwrkey_platform_data *pdata = mfd_get_data(pdev);
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "power key platform data not supplied\n");
+                return -EINVAL;
+        }
+
+        if (pdata->kpd_trigger_delay_us > 62500) {
+                dev_err(&pdev->dev, "invalid power key trigger delay\n");
+                return -EINVAL;
+        }
+
+        pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
+        if (!pwrkey)
+                return -ENOMEM;
+
+        pwr = input_allocate_device();
+        if (!pwr) {
+                dev_dbg(&pdev->dev, "Can't allocate power button\n");
+                err = -ENOMEM;
+                goto free_pwrkey;
+        }
+
+        input_set_capability(pwr, EV_KEY, KEY_POWER);
+
+        pwr->name = "pmic8xxx_pwrkey";
+        pwr->phys = "pmic8xxx_pwrkey/input0";
+        pwr->dev.parent = &pdev->dev;
+
+        delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
+        delay = 1 + ilog2(delay);
+
+        err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
+                goto free_input_dev;
+        }
+
+        pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
+        pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
+        if (pdata->pull_up)
+                pon_cntl |= PON_CNTL_PULL_UP;
+        else
+                pon_cntl &= ~PON_CNTL_PULL_UP;
+
+        err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
+                goto free_input_dev;
+        }
+
+        err = input_register_device(pwr);
+        if (err) {
+                dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
+                goto free_input_dev;
+        }
+
+        pwrkey->key_press_irq = key_press_irq;
+        pwrkey->pwr = pwr;
+
+        platform_set_drvdata(pdev, pwrkey);
+
+        err = request_irq(key_press_irq, pwrkey_press_irq,
+                IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
+        if (err < 0) {
+                dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
+                                 key_press_irq, err);
+                goto unreg_input_dev;
+        }
+
+        err = request_irq(key_release_irq, pwrkey_release_irq,
+                 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
+        if (err < 0) {
+                dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
+                                 key_release_irq, err);
+
+                goto free_press_irq;
+        }
+
+        device_init_wakeup(&pdev->dev, pdata->wakeup);
+
+        return 0;
+
+free_press_irq:
+        free_irq(key_press_irq, NULL);
+unreg_input_dev:
+        platform_set_drvdata(pdev, NULL);
+        input_unregister_device(pwr);
+        pwr = NULL;
+free_input_dev:
+        input_free_device(pwr);
+free_pwrkey:
+        kfree(pwrkey);
+        return err;
+}
+
+static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
+{
+        struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
+        int key_release_irq = platform_get_irq(pdev, 0);
+        int key_press_irq = platform_get_irq(pdev, 1);
+
+        device_init_wakeup(&pdev->dev, 0);
+
+        free_irq(key_press_irq, pwrkey);
+        free_irq(key_release_irq, pwrkey);
+        input_unregister_device(pwrkey->pwr);
+        platform_set_drvdata(pdev, NULL);
+        kfree(pwrkey);
+
+        return 0;
+}
+
+static struct platform_driver pmic8xxx_pwrkey_driver = {
+        .probe          = pmic8xxx_pwrkey_probe,
+        .remove         = __devexit_p(pmic8xxx_pwrkey_remove),
+        .driver         = {
+                .name   = PM8XXX_PWRKEY_DEV_NAME,
+                .owner  = THIS_MODULE,
+                .pm     = &pm8xxx_pwr_key_pm_ops,
+        },
+};
+
+static int __init pmic8xxx_pwrkey_init(void)
+{
+        return platform_driver_register(&pmic8xxx_pwrkey_driver);
+}
+module_init(pmic8xxx_pwrkey_init);
+
+static void __exit pmic8xxx_pwrkey_exit(void)
+{
+        platform_driver_unregister(&pmic8xxx_pwrkey_driver);
+}
+module_exit(pmic8xxx_pwrkey_exit);
+
+MODULE_ALIAS("platform:pmic8xxx_pwrkey");
+MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");