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authorPaul Mundt <lethal@linux-sh.org>2006-11-24 11:22:57 +0900
committerPaul Mundt <lethal@linux-sh.org>2006-12-06 10:45:38 +0900
commit9f5e8eee5cfe1328660c71812d87c2a67bda389f (patch)
treeb016c812709e4cc33496caac213a1315ca0d9e39
parent99a596f93be10001c50894bcab69e458a49a3b8c (diff)
sh: generic push-switch framework.
This adds support for a generic push switch framework. Adaptable for various switches, including GPIO switches and the push switches commonly found on Renesas debug boards. This allows switch states to be trivially reported through sysfs. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r--arch/sh/Kconfig2
-rw-r--r--arch/sh/drivers/Kconfig9
-rw-r--r--arch/sh/drivers/Makefile2
-rw-r--r--arch/sh/drivers/push-switch.c138
-rw-r--r--include/asm-sh/push-switch.h28
5 files changed, 178 insertions, 1 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d62183f355a..a03f155571c 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -473,6 +473,8 @@ config HEARTBEAT
behavior is platform-dependent, but normally the flash frequency is
a hyperbolic function of the 5-minute load average.
+source "arch/sh/drivers/Kconfig"
+
endmenu
config ISA_DMA_API
diff --git a/arch/sh/drivers/Kconfig b/arch/sh/drivers/Kconfig
new file mode 100644
index 00000000000..c54c758e624
--- /dev/null
+++ b/arch/sh/drivers/Kconfig
@@ -0,0 +1,9 @@
+menu "Additional SuperH Device Drivers"
+
+config PUSH_SWITCH
+ tristate "Push switch support"
+ help
+ This enables support for the push switch framework, a simple
+ framework that allows for sysfs driven switch status reporting.
+
+endmenu
diff --git a/arch/sh/drivers/Makefile b/arch/sh/drivers/Makefile
index 338c3729d27..bf18dbfb678 100644
--- a/arch/sh/drivers/Makefile
+++ b/arch/sh/drivers/Makefile
@@ -5,4 +5,4 @@
obj-$(CONFIG_PCI) += pci/
obj-$(CONFIG_SH_DMA) += dma/
obj-$(CONFIG_SUPERHYWAY) += superhyway/
-
+obj-$(CONFIG_PUSH_SWITCH) += push-switch.o
diff --git a/arch/sh/drivers/push-switch.c b/arch/sh/drivers/push-switch.c
new file mode 100644
index 00000000000..f2b9157c314
--- /dev/null
+++ b/arch/sh/drivers/push-switch.c
@@ -0,0 +1,138 @@
+/*
+ * Generic push-switch framework
+ *
+ * Copyright (C) 2006 Paul Mundt
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <asm/push-switch.h>
+
+#define DRV_NAME "push-switch"
+#define DRV_VERSION "0.1.0"
+
+static ssize_t switch_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct push_switch_platform_info *psw_info = dev->platform_data;
+ return sprintf(buf, "%s\n", psw_info->name);
+}
+static DEVICE_ATTR(switch, S_IRUGO, switch_show, NULL);
+
+static void switch_timer(unsigned long data)
+{
+ struct push_switch *psw = (struct push_switch *)data;
+
+ schedule_work(&psw->work);
+}
+
+static void switch_work_handler(void *data)
+{
+ struct platform_device *pdev = data;
+ struct push_switch *psw = platform_get_drvdata(pdev);
+
+ psw->state = 0;
+
+ kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
+}
+
+static int switch_drv_probe(struct platform_device *pdev)
+{
+ struct push_switch_platform_info *psw_info;
+ struct push_switch *psw;
+ int ret, irq;
+
+ psw = kzalloc(sizeof(struct push_switch), GFP_KERNEL);
+ if (unlikely(!psw))
+ return -ENOMEM;
+
+ irq = platform_get_irq(pdev, 0);
+ if (unlikely(irq < 0)) {
+ ret = -ENODEV;
+ goto err;
+ }
+
+ psw_info = pdev->dev.platform_data;
+ BUG_ON(!psw_info);
+
+ ret = request_irq(irq, psw_info->irq_handler,
+ IRQF_DISABLED | psw_info->irq_flags,
+ psw_info->name ? psw_info->name : DRV_NAME, pdev);
+ if (unlikely(ret < 0))
+ goto err;
+
+ if (psw_info->name) {
+ ret = device_create_file(&pdev->dev, &dev_attr_switch);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev, "Failed creating device attrs\n");
+ ret = -EINVAL;
+ goto err_irq;
+ }
+ }
+
+ INIT_WORK(&psw->work, switch_work_handler, pdev);
+ init_timer(&psw->debounce);
+
+ psw->debounce.function = switch_timer;
+ psw->debounce.data = (unsigned long)psw;
+
+ platform_set_drvdata(pdev, psw);
+
+ return 0;
+
+err_irq:
+ free_irq(irq, pdev);
+err:
+ kfree(psw);
+ return ret;
+}
+
+static int switch_drv_remove(struct platform_device *pdev)
+{
+ struct push_switch *psw = platform_get_drvdata(pdev);
+ struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
+ int irq = platform_get_irq(pdev, 0);
+
+ if (psw_info->name)
+ device_remove_file(&pdev->dev, &dev_attr_switch);
+
+ platform_set_drvdata(pdev, NULL);
+ flush_scheduled_work();
+ del_timer_sync(&psw->debounce);
+ free_irq(irq, pdev);
+
+ kfree(psw);
+
+ return 0;
+}
+
+static struct platform_driver switch_driver = {
+ .probe = switch_drv_probe,
+ .remove = switch_drv_remove,
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+static int __init switch_init(void)
+{
+ printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
+ return platform_driver_register(&switch_driver);
+}
+
+static void __exit switch_exit(void)
+{
+ platform_driver_unregister(&switch_driver);
+}
+module_init(switch_init);
+module_exit(switch_exit);
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Paul Mundt");
+MODULE_LICENSE("GPLv2");
diff --git a/include/asm-sh/push-switch.h b/include/asm-sh/push-switch.h
new file mode 100644
index 00000000000..dfc6bad567f
--- /dev/null
+++ b/include/asm-sh/push-switch.h
@@ -0,0 +1,28 @@
+#ifndef __ASM_SH_PUSH_SWITCH_H
+#define __ASM_SH_PUSH_SWITCH_H
+
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+
+struct push_switch {
+ /* switch state */
+ unsigned int state:1;
+ /* debounce timer */
+ struct timer_list debounce;
+ /* workqueue */
+ struct work_struct work;
+};
+
+struct push_switch_platform_info {
+ /* IRQ handler */
+ irqreturn_t (*irq_handler)(int irq, void *data);
+ /* Special IRQ flags */
+ unsigned int irq_flags;
+ /* Bit location of switch */
+ unsigned int bit;
+ /* Symbolic switch name */
+ const char *name;
+};
+
+#endif /* __ASM_SH_PUSH_SWITCH_H */