Input: add ixp4xx beeper driver

This is a driver for beeper found in LinkSys NSLU2 boxes. It should work
on any ixp4xx based platform.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 196 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index e08dbe08f46d..4bad588d0e5d 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -50,6 +50,18 @@ config INPUT_WISTRON_BTNS
           To compile this driver as a module, choose M here: the module will
           be called wistron_btns.
 
+config INPUT_IXP4XX_BEEPER
+        tristate "IXP4XX Beeper support"
+        depends on ARCH_IXP4XX
+        help
+          If you say yes here, you can connect a beeper to the
+          ixp4xx gpio pins. This is used by the LinkSys NSLU2.
+
+          If unsure, say Y.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ixp4xx-beeper.
+
 config INPUT_UINPUT
         tristate "User level driver support"
         help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index ce44cce01285..184c4129470d 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_INPUT_98SPKR)		+= 98spkr.o
 obj-$(CONFIG_INPUT_UINPUT)              += uinput.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)        += wistron_btns.o
 obj-$(CONFIG_HP_SDC_RTC)                += hp_sdc_rtc.o
+obj-$(CONFIG_INPUT_IXP4XX_BEEPER)       += ixp4xx-beeper.o
diff --git a/drivers/input/misc/ixp4xx-beeper.c b/drivers/input/misc/ixp4xx-beeper.c
new file mode 100644
index 000000000000..d448bb5e4869
--- /dev/null
+++ b/drivers/input/misc/ixp4xx-beeper.c
@@ -0,0 +1,183 @@
+/*
+ * Generic IXP4xx beeper driver
+ *
+ * Copyright (C) 2005 Tower Technologies
+ *
+ * based on nslu2-io.c
+ *  Copyright (C) 2004 Karen Spearel
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <asm/hardware.h>
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("ixp4xx beeper driver");
+MODULE_LICENSE("GPL");
+
+static DEFINE_SPINLOCK(beep_lock);
+
+static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&beep_lock, flags);
+
+         if (count) {
+                gpio_line_config(pin, IXP4XX_GPIO_OUT);
+                gpio_line_set(pin, IXP4XX_GPIO_LOW);
+
+                *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
+        } else {
+                gpio_line_config(pin, IXP4XX_GPIO_IN);
+                gpio_line_set(pin, IXP4XX_GPIO_HIGH);
+
+                *IXP4XX_OSRT2 = 0;
+        }
+
+        spin_unlock_irqrestore(&beep_lock, flags);
+}
+
+static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
+{
+        unsigned int pin = (unsigned int) dev->private;
+        unsigned int count = 0;
+
+        if (type != EV_SND)
+                return -1;
+
+        switch (code) {
+                case SND_BELL:
+                        if (value)
+                                value = 1000;
+                case SND_TONE:
+                        break;
+                default:
+                        return -1;
+        }
+
+        if (value > 20 && value < 32767)
+#ifndef FREQ
+                count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
+#else
+                count = (FREQ / (value * 4)) - 1;
+#endif
+
+        ixp4xx_spkr_control(pin, count);
+
+        return 0;
+}
+
+static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        /* clear interrupt */
+        *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
+
+        /* flip the beeper output */
+        *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
+{
+        struct input_dev *input_dev;
+        int err;
+
+        input_dev = input_allocate_device();
+        if (!input_dev)
+                return -ENOMEM;
+
+        input_dev->private = (void *) dev->id;
+        input_dev->name = "ixp4xx beeper",
+        input_dev->phys = "ixp4xx/gpio";
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->id.vendor  = 0x001f;
+        input_dev->id.product = 0x0001;
+        input_dev->id.version = 0x0100;
+        input_dev->cdev.dev = &dev->dev;
+
+        input_dev->evbit[0] = BIT(EV_SND);
+        input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
+        input_dev->event = ixp4xx_spkr_event;
+
+        err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
+                          SA_INTERRUPT | SA_TIMER, "ixp4xx-beeper", (void *) dev->id);
+        if (err)
+                goto err_free_device;
+
+        err = input_register_device(input_dev);
+        if (err)
+                goto err_free_irq;
+
+        platform_set_drvdata(dev, input_dev);
+
+        return 0;
+
+ err_free_irq:
+        free_irq(IRQ_IXP4XX_TIMER2, dev);
+ err_free_device:
+        input_free_device(input_dev);
+
+        return err;
+}
+
+static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
+{
+        struct input_dev *input_dev = platform_get_drvdata(dev);
+        unsigned int pin = (unsigned int) input_dev->private;
+
+        input_unregister_device(input_dev);
+        platform_set_drvdata(dev, NULL);
+
+        /* turn the speaker off */
+        disable_irq(IRQ_IXP4XX_TIMER2);
+        ixp4xx_spkr_control(pin, 0);
+
+        free_irq(IRQ_IXP4XX_TIMER2, dev);
+
+        return 0;
+}
+
+static void ixp4xx_spkr_shutdown(struct platform_device *dev)
+{
+        struct input_dev *input_dev = platform_get_drvdata(dev);
+        unsigned int pin = (unsigned int) input_dev->private;
+
+        /* turn off the speaker */
+        disable_irq(IRQ_IXP4XX_TIMER2);
+        ixp4xx_spkr_control(pin, 0);
+}
+
+static struct platform_driver ixp4xx_spkr_platform_driver = {
+        .driver         = {
+                .name   = "ixp4xx-beeper",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = ixp4xx_spkr_probe,
+        .remove         = __devexit_p(ixp4xx_spkr_remove),
+        .shutdown       = ixp4xx_spkr_shutdown,
+};
+
+static int __init ixp4xx_spkr_init(void)
+{
+        return platform_driver_register(&ixp4xx_spkr_platform_driver);
+}
+
+static void __exit ixp4xx_spkr_exit(void)
+{
+        platform_driver_unregister(&ixp4xx_spkr_platform_driver);
+}
+
+module_init(ixp4xx_spkr_init);
+module_exit(ixp4xx_spkr_exit);