Input: enable onkey driver of max8925

When ONKEY is held for 3 seconds, KEY_POWER event is reported.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 159 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 48cdabec372a..c44b9eafc556 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -80,6 +80,16 @@ config INPUT_M68K_BEEP
         tristate "M68k Beeper support"
         depends on M68K
 
+config INPUT_MAX8925_ONKEY
+        tristate "MAX8925 ONKEY support"
+        depends on MFD_MAX8925
+        help
+          Support the ONKEY of MAX8925 PMICs as an input device
+          reporting power button status.
+
+          To compile this driver as a module, choose M here: the module
+          will be called max8925_onkey.
+
 config INPUT_APANEL
         tristate "Fujitsu Lifebook Application Panel buttons"
         depends on X86 && I2C && LEDS_CLASS
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index f9f577031e06..71fe57d8023f 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_HP_SDC_RTC)		+= hp_sdc_rtc.o
 obj-$(CONFIG_INPUT_IXP4XX_BEEPER)       += ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)      += keyspan_remote.o
 obj-$(CONFIG_INPUT_M68K_BEEP)           += m68kspkr.o
+obj-$(CONFIG_INPUT_MAX8925_ONKEY)       += max8925_onkey.o
 obj-$(CONFIG_INPUT_PCAP)                += pcap_keys.o
 obj-$(CONFIG_INPUT_PCF50633_PMU)        += pcf50633-input.o
 obj-$(CONFIG_INPUT_PCF8574)             += pcf8574_keypad.o
diff --git a/drivers/input/misc/max8925_onkey.c b/drivers/input/misc/max8925_onkey.c
new file mode 100644
index 000000000000..80af44608018
--- /dev/null
+++ b/drivers/input/misc/max8925_onkey.c
@@ -0,0 +1,148 @@
+/**
+ * max8925_onkey.c - MAX8925 ONKEY driver
+ *
+ * Copyright (C) 2009 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/max8925.h>
+#include <linux/slab.h>
+
+#define HARDRESET_EN            (1 << 7)
+#define PWREN_EN                (1 << 7)
+
+struct max8925_onkey_info {
+        struct input_dev        *idev;
+        struct i2c_client       *i2c;
+        int                     irq;
+};
+
+/*
+ * MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
+ * max8925_set_bits() operates I2C bus and may sleep. So implement
+ * it in thread IRQ handler.
+ */
+static irqreturn_t max8925_onkey_handler(int irq, void *data)
+{
+        struct max8925_onkey_info *info = data;
+
+        input_report_key(info->idev, KEY_POWER, 1);
+        input_sync(info->idev);
+
+        /* Enable hardreset to halt if system isn't shutdown on time */
+        max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
+                         HARDRESET_EN, HARDRESET_EN);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit max8925_onkey_probe(struct platform_device *pdev)
+{
+        struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
+        struct max8925_onkey_info *info;
+        int error;
+
+        info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+
+        info->i2c = chip->i2c;
+        info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;
+
+        info->idev = input_allocate_device();
+        if (!info->idev) {
+                dev_err(chip->dev, "Failed to allocate input dev\n");
+                error = -ENOMEM;
+                goto out_input;
+        }
+
+        info->idev->name = "max8925_on";
+        info->idev->phys = "max8925_on/input0";
+        info->idev->id.bustype = BUS_I2C;
+        info->idev->dev.parent = &pdev->dev;
+        info->idev->evbit[0] = BIT_MASK(EV_KEY);
+        info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+
+        error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler,
+                                     IRQF_ONESHOT, "onkey", info);
+        if (error < 0) {
+                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
+                        info->irq, error);
+                goto out_irq;
+        }
+
+        error = input_register_device(info->idev);
+        if (error) {
+                dev_err(chip->dev, "Can't register input device: %d\n", error);
+                goto out;
+        }
+
+        platform_set_drvdata(pdev, info);
+
+        return 0;
+
+out:
+        free_irq(info->irq, info);
+out_irq:
+        input_free_device(info->idev);
+out_input:
+        kfree(info);
+        return error;
+}
+
+static int __devexit max8925_onkey_remove(struct platform_device *pdev)
+{
+        struct max8925_onkey_info *info = platform_get_drvdata(pdev);
+
+        free_irq(info->irq, info);
+        input_unregister_device(info->idev);
+        kfree(info);
+
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver max8925_onkey_driver = {
+        .driver         = {
+                .name   = "max8925-onkey",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = max8925_onkey_probe,
+        .remove         = __devexit_p(max8925_onkey_remove),
+};
+
+static int __init max8925_onkey_init(void)
+{
+        return platform_driver_register(&max8925_onkey_driver);
+}
+module_init(max8925_onkey_init);
+
+static void __exit max8925_onkey_exit(void)
+{
+        platform_driver_unregister(&max8925_onkey_driver);
+}
+module_exit(max8925_onkey_exit);
+
+MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");