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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/platform/iris
Initial import
Diffstat (limited to 'arch/x86/platform/iris')
-rw-r--r--arch/x86/platform/iris/Makefile1
-rw-r--r--arch/x86/platform/iris/iris.c136
2 files changed, 137 insertions, 0 deletions
diff --git a/arch/x86/platform/iris/Makefile b/arch/x86/platform/iris/Makefile
new file mode 100644
index 000000000..db921983a
--- /dev/null
+++ b/arch/x86/platform/iris/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_X86_32_IRIS) += iris.o
diff --git a/arch/x86/platform/iris/iris.c b/arch/x86/platform/iris/iris.c
new file mode 100644
index 000000000..735ba21ef
--- /dev/null
+++ b/arch/x86/platform/iris/iris.c
@@ -0,0 +1,136 @@
+/*
+ * 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/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.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 bool 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_probe(struct platform_device *pdev)
+{
+ unsigned char 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 int iris_remove(struct platform_device *pdev)
+{
+ pm_power_off = old_pm_power_off;
+ printk(KERN_INFO "Iris power_off handler uninstalled.\n");
+ return 0;
+}
+
+static struct platform_driver iris_driver = {
+ .driver = {
+ .name = "iris",
+ },
+ .probe = iris_probe,
+ .remove = iris_remove,
+};
+
+static struct resource iris_resources[] = {
+ {
+ .start = IRIS_GIO_BASE,
+ .end = IRIS_GIO_OUTPUT,
+ .flags = IORESOURCE_IO,
+ .name = "address"
+ }
+};
+
+static struct platform_device *iris_device;
+
+static int iris_init(void)
+{
+ int ret;
+ if (force != 1) {
+ printk(KERN_ERR "The force parameter has not been set to 1."
+ " The Iris poweroff handler will not be installed.\n");
+ return -ENODEV;
+ }
+ ret = platform_driver_register(&iris_driver);
+ if (ret < 0) {
+ printk(KERN_ERR "Failed to register iris platform driver: %d\n",
+ ret);
+ return ret;
+ }
+ iris_device = platform_device_register_simple("iris", (-1),
+ iris_resources, ARRAY_SIZE(iris_resources));
+ if (IS_ERR(iris_device)) {
+ printk(KERN_ERR "Failed to register iris platform device\n");
+ platform_driver_unregister(&iris_driver);
+ return PTR_ERR(iris_device);
+ }
+ return 0;
+}
+
+static void iris_exit(void)
+{
+ platform_device_unregister(iris_device);
+ platform_driver_unregister(&iris_driver);
+}
+
+module_init(iris_init);
+module_exit(iris_exit);