Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / x86 / platform / iris / iris.c

diff --git a/arch/x86/platform/iris/iris.c b/arch/x86/platform/iris/iris.c
new file mode 100644 (file)
index 0000000..1ba7f5e
--- /dev/null
+++ b/arch/x86/platform/iris/iris.c
@@ -0,0 +1,91 @@
+/*
+ * Eurobraille/Iris power off support.
+ *
+ * Eurobraille's Iris machine is a PC with no APM or ACPI support.
+ * It is shutdown by a special I/O sequence which this module provides.
+ *
+ *  Copyright (C) Shérab <Sebastien.Hinderer@ens-lyon.org>
+ *
+ * This program is free software ; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation ; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 the program ; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/moduleparam.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <asm/io.h>
+
+#define IRIS_GIO_BASE          0x340
+#define IRIS_GIO_INPUT         IRIS_GIO_BASE
+#define IRIS_GIO_OUTPUT                (IRIS_GIO_BASE + 1)
+#define IRIS_GIO_PULSE         0x80 /* First byte to send */
+#define IRIS_GIO_REST          0x00 /* Second byte to send */
+#define IRIS_GIO_NODEV         0xff /* Likely not an Iris */
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
+MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
+MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
+
+static int force;
+
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
+
+static void (*old_pm_power_off)(void);
+
+static void iris_power_off(void)
+{
+       outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
+       msleep(850);
+       outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
+}
+
+/*
+ * Before installing the power_off handler, try to make sure the OS is
+ * running on an Iris.  Since Iris does not support DMI, this is done
+ * by reading its input port and seeing whether the read value is
+ * meaningful.
+ */
+static int iris_init(void)
+{
+       unsigned char status;
+       if (force != 1) {
+               printk(KERN_ERR "The force parameter has not been set to 1 so the Iris poweroff handler will not be installed.\n");
+               return -ENODEV;
+       }
+       status = inb(IRIS_GIO_INPUT);
+       if (status == IRIS_GIO_NODEV) {
+               printk(KERN_ERR "This machine does not seem to be an Iris. Power_off handler not installed.\n");
+               return -ENODEV;
+       }
+       old_pm_power_off = pm_power_off;
+       pm_power_off = &iris_power_off;
+       printk(KERN_INFO "Iris power_off handler installed.\n");
+
+       return 0;
+}
+
+static void iris_exit(void)
+{
+       pm_power_off = old_pm_power_off;
+       printk(KERN_INFO "Iris power_off handler uninstalled.\n");
+}
+
+module_init(iris_init);
+module_exit(iris_exit);