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Subject[RFC v1 PATCH 4/6] input: pmic8058_pwrkey: Add support for power key
Date
Add support for PMIC8058 power key driven over dedicated
KYPD_PWR_N pin. It allows the user to specify the amount
of time by which the power key reporting can be delayed.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
---
drivers/input/misc/Kconfig | 11 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/pmic8058-pwrkey.c | 322 +++++++++++++++++++++++++++++++++
include/linux/input/pmic8058-pwrkey.h | 37 ++++
4 files changed, 371 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/pmic8058-pwrkey.c
create mode 100644 include/linux/input/pmic8058-pwrkey.h
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index b99b8cb..aeb9165 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -348,6 +348,17 @@ config INPUT_PWM_BEEPER
To compile this driver as a module, choose M here: the module will be
called pwm-beeper.

+config INPUT_PMIC8058_PWRKEY
+ tristate "PMIC8058 power key support"
+ depends on PMIC8058
+ help
+ Say Y here if you want support for the PMIC8058 power key.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pmic8058-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 1fe1f6c..c4357a0 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -31,6 +31,7 @@ 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-$(CONFIG_INPUT_PMIC8058_PWRKEY) += pmic8058-pwrkey.o
obj-$(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/pmic8058-pwrkey.c b/drivers/input/misc/pmic8058-pwrkey.c
new file mode 100644
index 0000000..3714b24
--- /dev/null
+++ b/drivers/input/misc/pmic8058-pwrkey.c
@@ -0,0 +1,322 @@
+/* Copyright (c) 2010, 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#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/mfd/pmic8058.h>
+#include <linux/log2.h>
+#include <linux/spinlock.h>
+#include <linux/hrtimer.h>
+
+#include <linux/input/pmic8058-pwrkey.h>
+
+#define PON_CNTL_1 0x1C
+#define PON_CNTL_PULL_UP BIT(7)
+#define PON_CNTL_TRIG_DELAY_MASK (0x7)
+
+/**
+ * struct pmic8058_pwrkey - pmic8058 pwrkey information
+ * @key_press_irq: key press irq number
+ * @pm_chip: pmic8058 parent
+ * @timer: timer for end key simulation
+ * @key_pressed: flag to keep track for power key reporting
+ * @pdata: platform data
+ * @lock: protect key press update and end key simulation
+ */
+struct pmic8058_pwrkey {
+ struct input_dev *pwr;
+ int key_press_irq;
+ struct pm8058_chip *pm_chip;
+ struct hrtimer timer;
+ bool key_pressed;
+ struct pmic8058_pwrkey_pdata *pdata;
+ spinlock_t lock;
+};
+
+static enum hrtimer_restart pmic8058_pwrkey_timer(struct hrtimer *timer)
+{
+ unsigned long flags;
+ struct pmic8058_pwrkey *pwrkey = container_of(timer,
+ struct pmic8058_pwrkey, timer);
+
+ spin_lock_irqsave(&pwrkey->lock, flags);
+ pwrkey->key_pressed = true;
+
+ input_report_key(pwrkey->pwr, KEY_POWER, 1);
+ input_sync(pwrkey->pwr);
+ spin_unlock_irqrestore(&pwrkey->lock, flags);
+
+ return HRTIMER_NORESTART;
+}
+
+static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
+{
+ struct pmic8058_pwrkey *pwrkey = _pwrkey;
+ struct pmic8058_pwrkey_pdata *pdata = pwrkey->pdata;
+ unsigned long flags;
+
+ /* no pwrkey time duration, means no end key simulation */
+ if (!pwrkey->pdata->pwrkey_time_ms) {
+ input_report_key(pwrkey->pwr, KEY_POWER, 1);
+ input_sync(pwrkey->pwr);
+ return IRQ_HANDLED;
+ }
+
+ spin_lock_irqsave(&pwrkey->lock, flags);
+
+ input_report_key(pwrkey->pwr, KEY_END, 1);
+ input_sync(pwrkey->pwr);
+
+ hrtimer_start(&pwrkey->timer,
+ ktime_set(pdata->pwrkey_time_ms / 1000,
+ (pdata->pwrkey_time_ms % 1000) * 1000000),
+ HRTIMER_MODE_REL);
+ spin_unlock_irqrestore(&pwrkey->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
+{
+ struct pmic8058_pwrkey *pwrkey = _pwrkey;
+ unsigned long flags;
+
+ /* no pwrkey time, means no delay in pwr key reporting */
+ if (!pwrkey->pdata->pwrkey_time_ms) {
+ input_report_key(pwrkey->pwr, KEY_POWER, 0);
+ input_sync(pwrkey->pwr);
+ return IRQ_HANDLED;
+ }
+
+ spin_lock_irqsave(&pwrkey->lock, flags);
+ hrtimer_cancel(&pwrkey->timer);
+
+ if (pwrkey->key_pressed) {
+ pwrkey->key_pressed = false;
+ input_report_key(pwrkey->pwr, KEY_POWER, 0);
+ input_sync(pwrkey->pwr);
+ }
+
+ input_report_key(pwrkey->pwr, KEY_END, 0);
+ input_sync(pwrkey->pwr);
+
+ spin_unlock_irqrestore(&pwrkey->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PM
+static int pmic8058_pwrkey_suspend(struct device *dev)
+{
+ struct pmic8058_pwrkey *pwrkey = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(pwrkey->key_press_irq);
+
+ return 0;
+}
+
+static int pmic8058_pwrkey_resume(struct device *dev)
+{
+ struct pmic8058_pwrkey *pwrkey = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(pwrkey->key_press_irq);
+
+ return 0;
+}
+
+static const struct dev_pm_ops pm8058_pwr_key_pm_ops = {
+ .suspend = pmic8058_pwrkey_suspend,
+ .resume = pmic8058_pwrkey_resume,
+};
+#endif
+
+static int __devinit pmic8058_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 pmic8058_pwrkey *pwrkey;
+ struct pmic8058_pwrkey_pdata *pdata = pdev->dev.platform_data;
+ struct pm8058_chip *pm_chip;
+
+ pm_chip = platform_get_drvdata(pdev);
+ if (pm_chip == NULL) {
+ dev_err(&pdev->dev, "no parent data passed in\n");
+ return -EFAULT;
+ }
+
+ 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 pwr key trigger delay\n");
+ return -EINVAL;
+ }
+
+ if (pdata->pwrkey_time_ms &&
+ (pdata->pwrkey_time_ms < 500 || pdata->pwrkey_time_ms > 1000)) {
+ dev_err(&pdev->dev, "invalid pwr key time supplied\n");
+ return -EINVAL;
+ }
+
+ pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
+ if (!pwrkey)
+ return -ENOMEM;
+
+ pwrkey->pm_chip = pm_chip;
+ pwrkey->pdata = pdata;
+
+ 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);
+ input_set_capability(pwr, EV_KEY, KEY_END);
+
+ pwr->name = "pmic8058_pwrkey";
+ pwr->phys = "pmic8058_pwrkey/input0";
+ pwr->dev.parent = &pdev->dev;
+
+ delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
+ delay = 1 + ilog2(delay);
+
+ err = pm8058_read(pwrkey->pm_chip, PON_CNTL_1, &pon_cntl, 1);
+ 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);
+ pon_cntl |= (pdata->pull_up ? PON_CNTL_PULL_UP : ~PON_CNTL_PULL_UP);
+ err = pm8058_write(pwrkey->pm_chip, PON_CNTL_1, &pon_cntl, 1);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
+ goto free_input_dev;
+ }
+
+ hrtimer_init(&pwrkey->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ pwrkey->timer.function = pmic8058_pwrkey_timer;
+
+ spin_lock_init(&pwrkey->lock);
+
+ 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_any_context_irq(key_press_irq, pwrkey_press_irq,
+ IRQF_TRIGGER_RISING, "pmic8058_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_any_context_irq(key_release_irq, pwrkey_release_irq,
+ IRQF_TRIGGER_RISING, "pmic8058_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:
+ input_unregister_device(pwr);
+ pwr = NULL;
+free_input_dev:
+ input_free_device(pwr);
+free_pwrkey:
+ kfree(pwrkey);
+ return err;
+}
+
+static int __devexit pmic8058_pwrkey_remove(struct platform_device *pdev)
+{
+ struct pmic8058_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);
+ kfree(pwrkey);
+
+ return 0;
+}
+
+static struct platform_driver pmic8058_pwrkey_driver = {
+ .probe = pmic8058_pwrkey_probe,
+ .remove = __devexit_p(pmic8058_pwrkey_remove),
+ .driver = {
+ .name = "pm8058-pwrkey",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &pm8058_pwr_key_pm_ops,
+#endif
+ },
+};
+
+static int __init pmic8058_pwrkey_init(void)
+{
+ return platform_driver_register(&pmic8058_pwrkey_driver);
+}
+module_init(pmic8058_pwrkey_init);
+
+static void __exit pmic8058_pwrkey_exit(void)
+{
+ platform_driver_unregister(&pmic8058_pwrkey_driver);
+}
+module_exit(pmic8058_pwrkey_exit);
+
+MODULE_ALIAS("platform:pmic8058_pwrkey");
+MODULE_DESCRIPTION("PMIC8058 Power Key driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
diff --git a/include/linux/input/pmic8058-pwrkey.h b/include/linux/input/pmic8058-pwrkey.h
new file mode 100644
index 0000000..dd849fe
--- /dev/null
+++ b/include/linux/input/pmic8058-pwrkey.h
@@ -0,0 +1,37 @@
+/* Copyright (c) 2010, 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef __PMIC8058_PWRKEY_H__
+#define __PMIC8058_PWRKEY_H__
+/**
+ * struct pmic8058_pwrkey_pdata - platform data for pwrkey driver
+ * @pull up: power on register control for pull up/down configuration
+ * @pwrkey_time_ms: time after which power key event should be generated, if
+ * key is released before then end key is reported.
+ * Supply zero for only power key reporting.
+ * @kpd_trigger_delay_us: time delay for power key state change interrupt
+ * trigger.
+ * @wakeup: configure power key as wakeup source
+ */
+struct pmic8058_pwrkey_pdata {
+ bool pull_up;
+ u16 pwrkey_time_ms;
+ u32 kpd_trigger_delay_us;
+ u32 wakeup;
+};
+
+#endif /* __PMIC8058_PWRKEY_H__ */
--
1.7.0.2


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