Add Nokia CBUS support

[linux-2.6-omap-h63xx.git] / drivers / cbus / retu-pwrbutton.c

diff --git a/drivers/cbus/retu-pwrbutton.c b/drivers/cbus/retu-pwrbutton.c
new file mode 100644 (file)
index 0000000..38d7aa4
--- /dev/null
+++ b/drivers/cbus/retu-pwrbutton.c
@@ -0,0 +1,118 @@
+/**
+ * drivers/cbus/retu-pwrbutton.c
+ *
+ * Driver for sending retu power button event to input-layer
+ *
+ * Copyright (C) 2004 Nokia Corporation
+ *
+ * Written by Ari Saastamoinen <ari.saastamoinen@elektrobit.com>
+ *
+ * Contact Juha Yrjölä <juha.yrjola@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/timer.h>
+#include <linux/jiffies.h>
+#include <linux/bitops.h>
+
+#include "retu.h"
+
+#define RETU_STATUS_PWRONX     (1 << 5)
+
+#define PWRBTN_DELAY           20
+#define PWRBTN_UP              0
+#define PWRBTN_PRESSED         1
+
+static int pwrbtn_state;
+static struct input_dev *pwrbtn_dev;
+static struct timer_list pwrbtn_timer;
+
+static void retubutton_timer_func(unsigned long arg)
+{
+       int state;
+
+       if (retu_read_reg(RETU_REG_STATUS) & RETU_STATUS_PWRONX)
+               state = PWRBTN_UP;
+       else
+               state = PWRBTN_PRESSED;
+
+       if (pwrbtn_state != state) {
+               input_report_key(pwrbtn_dev, KEY_POWER, state);
+               pwrbtn_state = state;
+       }
+}
+
+/**
+ * Interrupt function is called whenever power button key is pressed
+ * or released.
+ */
+static void retubutton_irq(unsigned long arg)
+{
+       retu_ack_irq(RETU_INT_PWR);
+       mod_timer(&pwrbtn_timer, jiffies + msecs_to_jiffies(PWRBTN_DELAY));
+}
+
+/**
+ * Init function.
+ * Allocates interrupt for power button and registers itself to input layer.
+ */
+static int __init retubutton_init(void)
+{
+       int irq;
+
+       printk(KERN_INFO "Retu power button driver initialized\n");
+       irq = RETU_INT_PWR;
+
+       init_timer(&pwrbtn_timer);
+       pwrbtn_timer.function = retubutton_timer_func;
+
+       if (retu_request_irq(irq, &retubutton_irq, 0, "PwrOnX") < 0) {
+               printk(KERN_ERR "%s@%s: Cannot allocate irq\n",
+                      __FUNCTION__, __FILE__);
+               return -EBUSY;
+       }
+
+       pwrbtn_dev = input_allocate_device();
+       if (!pwrbtn_dev)
+               return -ENOMEM;
+
+       pwrbtn_dev->evbit[0] = BIT_MASK(EV_KEY);
+       pwrbtn_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+       pwrbtn_dev->name = "retu-pwrbutton";
+
+       return input_register_device(pwrbtn_dev);
+}
+
+/**
+ * Cleanup function which is called when driver is unloaded
+ */
+static void __exit retubutton_exit(void)
+{
+       retu_free_irq(RETU_INT_PWR);
+       del_timer_sync(&pwrbtn_timer);
+       input_unregister_device(pwrbtn_dev);
+}
+
+module_init(retubutton_init);
+module_exit(retubutton_exit);
+
+MODULE_DESCRIPTION("Retu Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ari Saastamoinen");