Input: add twl4030-pwrbutton driver

This is part of the twl4030 multifunction device driver that supports
reporting KEY_POWER events via the input layer.

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 156 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 5c0a631d145..6cff5acfa85 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -193,6 +193,16 @@ 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
+        help
+          Say Y here if you want to enable power key reporting via the
+          TWL4030 family of chips.
+
+          To compile this driver as a module, choose M here. The module will
+          be called twl4030_pwrbutton.
+
 config INPUT_UINPUT
         tristate "User level driver support"
         help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index eb3f407baed..c7e444912d7 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_INPUT_RB532_BUTTON)	+= rb532_button.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
 obj-$(CONFIG_INPUT_SGI_BTNS)            += sgi_btns.o
 obj-$(CONFIG_INPUT_SPARCSPKR)           += sparcspkr.o
+obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON)   += twl4030-pwrbutton.o
 obj-$(CONFIG_INPUT_UINPUT)              += uinput.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)        += wistron_btns.o
 obj-$(CONFIG_INPUT_YEALINK)             += yealink.o
diff --git a/drivers/input/misc/twl4030-pwrbutton.c b/drivers/input/misc/twl4030-pwrbutton.c
new file mode 100644
index 00000000000..f5fc9974a11
--- /dev/null
+++ b/drivers/input/misc/twl4030-pwrbutton.c
@@ -0,0 +1,145 @@
+/**
+ * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
+ * Several fixes by Felipe Balbi <felipe.balbi@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 irqreturn_t powerbutton_irq(int irq, void *_pwr)
+{
+        struct input_dev *pwr = _pwr;
+        int err;
+        u8 value;
+
+#ifdef CONFIG_LOCKDEP
+        /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
+         * we don't want and can't tolerate since this is a threaded
+         * IRQ and can sleep due to the i2c reads it has to issue.
+         * 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(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
+                input_sync(pwr);
+        } else {
+                dev_err(pwr->dev.parent, "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)
+{
+        struct input_dev *pwr;
+        int irq = platform_get_irq(pdev, 0);
+        int err;
+
+        pwr = input_allocate_device();
+        if (!pwr) {
+                dev_dbg(&pdev->dev, "Can't allocate power button\n");
+                return -ENOMEM;
+        }
+
+        pwr->evbit[0] = BIT_MASK(EV_KEY);
+        pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+        pwr->name = "twl4030_pwrbutton";
+        pwr->phys = "twl4030_pwrbutton/input0";
+        pwr->dev.parent = &pdev->dev;
+
+        err = request_irq(irq, powerbutton_irq,
+                        IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                        "twl4030_pwrbutton", pwr);
+        if (err < 0) {
+                dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
+                goto free_input_dev;
+        }
+
+        err = input_register_device(pwr);
+        if (err) {
+                dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
+                goto free_irq;
+        }
+
+        platform_set_drvdata(pdev, pwr);
+
+        return 0;
+
+free_irq:
+        free_irq(irq, NULL);
+free_input_dev:
+        input_free_device(pwr);
+        return err;
+}
+
+static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev)
+{
+        struct input_dev *pwr = platform_get_drvdata(pdev);
+        int irq = platform_get_irq(pdev, 0);
+
+        free_irq(irq, pwr);
+        input_unregister_device(pwr);
+
+        return 0;
+}
+
+struct platform_driver twl4030_pwrbutton_driver = {
+        .probe          = twl4030_pwrbutton_probe,
+        .remove         = __devexit_p(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_ALIAS("platform:twl4030_pwrbutton");
+MODULE_DESCRIPTION("Triton2 Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
+MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
+