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authorPavel Machek <pavel@suse.cz>2008-10-20 23:02:43 +0100
committerRichard Purdie <rpurdie@linux.intel.com>2008-10-20 23:02:43 +0100
commit9c78ff6e65cad9f9fcf0bbde2bfbbf3a544fb704 (patch)
tree3ca17569331f882a265a6ceee5a866640edac145 /drivers/leds/leds-hp-disk.c
parent0adaf6e4c23dd8a7ab20fb3acaa58e3f8422ac60 (diff)
leds: Add driver for HP harddisk protection LEDs
HP notebooks contain accelerometer-based disk protection subsystem, and LED that indicates hard disk is protected. This is driver for the LED part. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
Diffstat (limited to 'drivers/leds/leds-hp-disk.c')
-rw-r--r--drivers/leds/leds-hp-disk.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/leds/leds-hp-disk.c b/drivers/leds/leds-hp-disk.c
new file mode 100644
index 00000000000..d636280198a
--- /dev/null
+++ b/drivers/leds/leds-hp-disk.c
@@ -0,0 +1,156 @@
+/*
+ * leds-hp-disk.c - driver for HP "hard disk protection" LED
+ *
+ * Copyright (C) 2008 Pavel Machek
+ *
+ * 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/dmi.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/kthread.h>
+#include <linux/version.h>
+#include <linux/leds.h>
+#include <acpi/acpi_drivers.h>
+
+#define DRIVER_NAME "leds-hp-disk"
+#define ACPI_MDPS_CLASS "led"
+
+/* For automatic insertion of the module */
+static struct acpi_device_id hpled_device_ids[] = {
+ {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, hpled_device_ids);
+
+struct acpi_hpled {
+ struct acpi_device *device; /* The ACPI device */
+};
+
+static struct acpi_hpled adev;
+
+static acpi_status hpled_acpi_write(acpi_handle handle, int reg)
+{
+ unsigned long ret; /* Not used when writing */
+ union acpi_object in_obj[1];
+ struct acpi_object_list args = { 1, in_obj };
+
+ in_obj[0].type = ACPI_TYPE_INTEGER;
+ in_obj[0].integer.value = reg;
+
+ return acpi_evaluate_integer(handle, "ALED", &args, &ret);
+}
+
+static void hpled_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ hpled_acpi_write(adev.device->handle, !!value);
+}
+
+static struct led_classdev hpled_led = {
+ .name = "hp:red:hddprotection",
+ .default_trigger = "heartbeat",
+ .brightness_set = hpled_set,
+};
+
+#ifdef CONFIG_PM
+static int hpled_suspend(struct acpi_device *dev, pm_message_t state)
+{
+ led_classdev_suspend(&hpled_led);
+ return 0;
+}
+
+static int hpled_resume(struct acpi_device *dev)
+{
+ led_classdev_resume(&hpled_led);
+ return 0;
+}
+#else
+#define hpled_suspend NULL
+#define hpled_resume NULL
+#endif
+
+static int hpled_add(struct acpi_device *device)
+{
+ int ret;
+
+ if (!device)
+ return -EINVAL;
+
+ adev.device = device;
+ strcpy(acpi_device_name(device), DRIVER_NAME);
+ strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
+ acpi_driver_data(device) = &adev;
+
+ ret = led_classdev_register(NULL, &hpled_led);
+ return ret;
+}
+
+static int hpled_remove(struct acpi_device *device, int type)
+{
+ if (!device)
+ return -EINVAL;
+
+ led_classdev_unregister(&hpled_led);
+ return 0;
+}
+
+
+
+static struct acpi_driver leds_hp_driver = {
+ .name = DRIVER_NAME,
+ .class = ACPI_MDPS_CLASS,
+ .ids = hpled_device_ids,
+ .ops = {
+ .add = hpled_add,
+ .remove = hpled_remove,
+ .suspend = hpled_suspend,
+ .resume = hpled_resume,
+ }
+};
+
+static int __init hpled_init_module(void)
+{
+ int ret;
+
+ if (acpi_disabled)
+ return -ENODEV;
+
+ ret = acpi_bus_register_driver(&leds_hp_driver);
+ if (ret < 0)
+ return ret;
+
+ printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
+
+ return 0;
+}
+
+static void __exit hpled_exit_module(void)
+{
+ acpi_bus_unregister_driver(&leds_hp_driver);
+}
+
+MODULE_DESCRIPTION("Driver for HP disk protection LED");
+MODULE_AUTHOR("Pavel Machek <pavel@suse.cz>");
+MODULE_LICENSE("GPL");
+
+module_init(hpled_init_module);
+module_exit(hpled_exit_module);