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Subject[PATCH 1/2] input: misc: add twl4030-pwrbutton driver
Date
From: Felipe Balbi <felipe.balbi@nokia.com>

This is part of the twl4030 multifunction device driver.

With this driver we add support for reporting KEY_POWER
events via the input layer.

Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
---
I guess this part should go via input tree if Sam is ok with it.
drivers/input/misc/Kconfig | 4 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/twl4030-pwrbutton.c | 147 ++++++++++++++++++++++++++++++++
3 files changed, 152 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/twl4030-pwrbutton.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 67e5553..9667b50 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -193,6 +193,10 @@ config INPUT_CM109
To compile this driver as a module, choose M here: the module will be
called cm109.

+config INPUT_TWL4030_PWRBUTTON
+ tristate "TWL4030 Power button Driver"
+ depends on TWL4030_CORE
+
config INPUT_UINPUT
tristate "User level driver support"
help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index bb62e6e..2fabcdb 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_INPUT_YEALINK) += yealink.o
obj-$(CONFIG_INPUT_CM109) += cm109.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_UINPUT) += uinput.o
+obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON) += twl4030-pwrbutton.o
obj-$(CONFIG_INPUT_APANEL) += apanel.o
obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
diff --git a/drivers/input/misc/twl4030-pwrbutton.c b/drivers/input/misc/twl4030-pwrbutton.c
new file mode 100644
index 0000000..676d789
--- /dev/null
+++ b/drivers/input/misc/twl4030-pwrbutton.c
@@ -0,0 +1,147 @@
+/**
+ * drivers/i2c/chips/twl4030-pwrbutton.c
+ *
+ * Driver for sending triton2 power button event to input-layer
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/twl4030.h>
+
+#define PWR_PWRON_IRQ (1 << 0)
+
+#define STS_HW_CONDITIONS 0xf
+
+static struct input_dev *powerbutton_dev;
+static struct device *dbg_dev;
+
+static irqreturn_t powerbutton_irq(int irq, void *dev_id)
+{
+ int err;
+ u8 value;
+
+#ifdef CONFIG_LOCKDEP
+ /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
+ * we don't want and can't tolerate. Although it might be
+ * friendlier not to borrow this thread context...
+ */
+ local_irq_enable();
+#endif
+
+ err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
+ STS_HW_CONDITIONS);
+ if (!err) {
+ input_report_key(powerbutton_dev, KEY_POWER,
+ value & PWR_PWRON_IRQ);
+ } else {
+ dev_err(dbg_dev, "twl4030: i2c error %d while reading TWL4030"
+ " PM_MASTER STS_HW_CONDITIONS register\n", err);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit twl4030_pwrbutton_probe(struct platform_device *pdev)
+{
+ int err = 0;
+ int irq = platform_get_irq(pdev, 0);
+
+ dbg_dev = &pdev->dev;
+
+ /* PWRBTN == PWRON */
+ err = request_irq(irq, powerbutton_irq,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "twl4030-pwrbutton", NULL);
+ if (err < 0) {
+ dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
+ goto out;
+ }
+
+ powerbutton_dev = input_allocate_device();
+ if (!powerbutton_dev) {
+ dev_dbg(&pdev->dev, "Can't allocate power button\n");
+ err = -ENOMEM;
+ goto free_irq_and_out;
+ }
+
+ powerbutton_dev->evbit[0] = BIT_MASK(EV_KEY);
+ powerbutton_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+ powerbutton_dev->name = "triton2-pwrbutton";
+
+ err = input_register_device(powerbutton_dev);
+ if (err) {
+ dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
+ goto free_input_dev;
+ }
+
+ dev_info(&pdev->dev, "triton2 power button driver initialized\n");
+
+ return 0;
+
+
+free_input_dev:
+ input_free_device(powerbutton_dev);
+free_irq_and_out:
+ free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
+out:
+ return err;
+}
+
+static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev)
+{
+ int irq = platform_get_irq(pdev, 0);
+
+ free_irq(irq, NULL);
+ input_unregister_device(powerbutton_dev);
+ input_free_device(powerbutton_dev);
+
+ return 0;
+}
+
+struct platform_driver twl4030_pwrbutton_driver = {
+ .probe = twl4030_pwrbutton_probe,
+ .remove = twl4030_pwrbutton_remove,
+ .driver = {
+ .name = "twl4030-pwrbutton",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init twl4030_pwrbutton_init(void)
+{
+ return platform_driver_register(&twl4030_pwrbutton_driver);
+}
+module_init(twl4030_pwrbutton_init);
+
+static void __exit twl4030_pwrbutton_exit(void)
+{
+ platform_driver_unregister(&twl4030_pwrbutton_driver);
+}
+module_exit(twl4030_pwrbutton_exit);
+
+MODULE_DESCRIPTION("Triton2 Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter De Schrijver");
+
--
1.6.2.rc0.61.g5cd12


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