input: Support onkey in 88pm860x

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 155 insertions, 0 deletions

diff --git a/drivers/input/misc/88pm860x_onkey.c b/drivers/input/misc/88pm860x_onkey.c
new file mode 100644
index 000000000000..69a48e8701b9
--- /dev/null
+++ b/drivers/input/misc/88pm860x_onkey.c
@@ -0,0 +1,155 @@
+/*
+ * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
+ *
+ * Copyright (C) 2009-2010 Marvell International Ltd.
+ *      Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/88pm860x.h>
+
+#define PM8607_WAKEUP           0x0b
+
+#define LONG_ONKEY_EN           (1 << 1)
+#define ONKEY_STATUS            (1 << 0)
+
+struct pm860x_onkey_info {
+        struct input_dev        *idev;
+        struct pm860x_chip      *chip;
+        struct i2c_client       *i2c;
+        struct device           *dev;
+        int                     irq;
+};
+
+/* 88PM860x gives us an interrupt when ONKEY is held */
+static irqreturn_t pm860x_onkey_handler(int irq, void *data)
+{
+        struct pm860x_onkey_info *info = data;
+        int ret;
+
+        ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
+        ret &= ONKEY_STATUS;
+        input_report_key(info->idev, KEY_POWER, ret);
+        input_sync(info->idev);
+
+        /* Enable 8-second long onkey detection */
+        pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
+        return IRQ_HANDLED;
+}
+
+static int __devinit pm860x_onkey_probe(struct platform_device *pdev)
+{
+        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+        struct pm860x_onkey_info *info;
+        int irq, ret;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "No IRQ resource!\n");
+                return -EINVAL;
+        }
+
+        info = kzalloc(sizeof(struct pm860x_onkey_info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+        info->chip = chip;
+        info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
+        info->dev = &pdev->dev;
+        info->irq = irq + chip->irq_base;
+
+        info->idev = input_allocate_device();
+        if (!info->idev) {
+                dev_err(chip->dev, "Failed to allocate input dev\n");
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        info->idev->name = "88pm860x_on";
+        info->idev->phys = "88pm860x_on/input0";
+        info->idev->id.bustype = BUS_I2C;
+        info->idev->dev.parent = &pdev->dev;
+        info->irq = irq;
+        info->idev->evbit[0] = BIT_MASK(EV_KEY);
+        info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+
+        ret = input_register_device(info->idev);
+        if (ret) {
+                dev_err(chip->dev, "Can't register input device: %d\n", ret);
+                goto out_reg;
+        }
+
+        ret = request_threaded_irq(info->irq, NULL, pm860x_onkey_handler,
+                                   IRQF_ONESHOT, "onkey", info);
+        if (ret < 0) {
+                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
+                        info->irq, ret);
+                goto out_irq;
+        }
+
+        platform_set_drvdata(pdev, info);
+        return 0;
+
+out_irq:
+        input_unregister_device(info->idev);
+        kfree(info);
+        return ret;
+
+out_reg:
+        input_free_device(info->idev);
+out:
+        kfree(info);
+        return ret;
+}
+
+static int __devexit pm860x_onkey_remove(struct platform_device *pdev)
+{
+        struct pm860x_onkey_info *info = platform_get_drvdata(pdev);
+
+        free_irq(info->irq, info);
+        input_unregister_device(info->idev);
+        kfree(info);
+        return 0;
+}
+
+static struct platform_driver pm860x_onkey_driver = {
+        .driver         = {
+                .name   = "88pm860x-onkey",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = pm860x_onkey_probe,
+        .remove         = __devexit_p(pm860x_onkey_remove),
+};
+
+static int __init pm860x_onkey_init(void)
+{
+        return platform_driver_register(&pm860x_onkey_driver);
+}
+module_init(pm860x_onkey_init);
+
+static void __exit pm860x_onkey_exit(void)
+{
+        platform_driver_unregister(&pm860x_onkey_driver);
+}
+module_exit(pm860x_onkey_exit);
+
+MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");