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path: root/drivers/hwmon/hp_accel.c
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Diffstat (limited to 'drivers/hwmon/hp_accel.c')
-rw-r--r--drivers/hwmon/hp_accel.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
new file mode 100644
index 000000000000..bf8d40580577
--- /dev/null
+++ b/drivers/hwmon/hp_accel.c
@@ -0,0 +1,265 @@
+/*
+ * hp_accel.c - Interface between LIS3LV02DL driver and HP ACPI BIOS
+ *
+ * Copyright (C) 2007-2008 Yan Burman
+ * Copyright (C) 2008 Eric Piel
+ * 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/semaphore.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/poll.h>
+#include <linux/freezer.h>
+#include <linux/version.h>
+#include <linux/uaccess.h>
+#include <acpi/acpi_drivers.h>
+#include <asm/atomic.h>
+#include "lis3lv02d.h"
+
+#define DRIVER_NAME "lis3lv02d"
+#define ACPI_MDPS_CLASS "accelerometer"
+
+
+/* For automatic insertion of the module */
+static struct acpi_device_id lis3lv02d_device_ids[] = {
+ {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
+
+
+/**
+ * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
+ * @handle: the handle of the device
+ *
+ * Returns AE_OK on success.
+ */
+acpi_status lis3lv02d_acpi_init(acpi_handle handle)
+{
+ return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
+}
+
+/**
+ * lis3lv02d_acpi_read - ACPI ALRD method: read a register
+ * @handle: the handle of the device
+ * @reg: the register to read
+ * @ret: result of the operation
+ *
+ * Returns AE_OK on success.
+ */
+acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
+{
+ union acpi_object arg0 = { ACPI_TYPE_INTEGER };
+ struct acpi_object_list args = { 1, &arg0 };
+ unsigned long long lret;
+ acpi_status status;
+
+ arg0.integer.value = reg;
+
+ status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
+ *ret = lret;
+ return status;
+}
+
+/**
+ * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
+ * @handle: the handle of the device
+ * @reg: the register to write to
+ * @val: the value to write
+ *
+ * Returns AE_OK on success.
+ */
+acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
+{
+ unsigned long long ret; /* Not used when writting */
+ union acpi_object in_obj[2];
+ struct acpi_object_list args = { 2, in_obj };
+
+ in_obj[0].type = ACPI_TYPE_INTEGER;
+ in_obj[0].integer.value = reg;
+ in_obj[1].type = ACPI_TYPE_INTEGER;
+ in_obj[1].integer.value = val;
+
+ return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
+}
+
+static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
+{
+ adev.ac = *((struct axis_conversion *)dmi->driver_data);
+ printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
+
+ return 1;
+}
+
+/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
+ * If the value is negative, the opposite of the hw value is used. */
+static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
+static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
+static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
+static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
+static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
+static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
+
+#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
+ .ident = _ident, \
+ .callback = lis3lv02d_dmi_matched, \
+ .matches = { \
+ DMI_MATCH(DMI_PRODUCT_NAME, _name) \
+ }, \
+ .driver_data = &lis3lv02d_axis_##_axis \
+}
+static struct dmi_system_id lis3lv02d_dmi_ids[] = {
+ /* product names are truncated to match all kinds of a same model */
+ AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
+ AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
+ AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
+ AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
+ AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
+ AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
+ AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
+ { NULL, }
+/* Laptop models without axis info (yet):
+ * "NC651xx" "HP Compaq 651"
+ * "NC671xx" "HP Compaq 671"
+ * "NC6910" "HP Compaq 6910"
+ * HP Compaq 8710x Notebook PC / Mobile Workstation
+ * "NC2400" "HP Compaq nc2400"
+ * "NX74x0" "HP Compaq nx74"
+ * "NX6325" "HP Compaq nx6325"
+ * "NC4400" "HP Compaq nc4400"
+ */
+};
+
+
+static int lis3lv02d_add(struct acpi_device *device)
+{
+ u8 val;
+
+ if (!device)
+ return -EINVAL;
+
+ adev.device = device;
+ adev.init = lis3lv02d_acpi_init;
+ adev.read = lis3lv02d_acpi_read;
+ adev.write = lis3lv02d_acpi_write;
+ strcpy(acpi_device_name(device), DRIVER_NAME);
+ strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
+ device->driver_data = &adev;
+
+ lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
+ if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
+ printk(KERN_ERR DRIVER_NAME
+ ": Accelerometer chip not LIS3LV02D{L,Q}\n");
+ }
+
+ /* If possible use a "standard" axes order */
+ if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
+ printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
+ "using default axes configuration\n");
+ adev.ac = lis3lv02d_axis_normal;
+ }
+
+ return lis3lv02d_init_device(&adev);
+}
+
+static int lis3lv02d_remove(struct acpi_device *device, int type)
+{
+ if (!device)
+ return -EINVAL;
+
+ lis3lv02d_joystick_disable();
+ lis3lv02d_poweroff(device->handle);
+
+ return lis3lv02d_remove_fs();
+}
+
+
+#ifdef CONFIG_PM
+static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
+{
+ /* make sure the device is off when we suspend */
+ lis3lv02d_poweroff(device->handle);
+ return 0;
+}
+
+static int lis3lv02d_resume(struct acpi_device *device)
+{
+ /* put back the device in the right state (ACPI might turn it on) */
+ mutex_lock(&adev.lock);
+ if (adev.usage > 0)
+ lis3lv02d_poweron(device->handle);
+ else
+ lis3lv02d_poweroff(device->handle);
+ mutex_unlock(&adev.lock);
+ return 0;
+}
+#else
+#define lis3lv02d_suspend NULL
+#define lis3lv02d_resume NULL
+#endif
+
+/* For the HP MDPS aka 3D Driveguard */
+static struct acpi_driver lis3lv02d_driver = {
+ .name = DRIVER_NAME,
+ .class = ACPI_MDPS_CLASS,
+ .ids = lis3lv02d_device_ids,
+ .ops = {
+ .add = lis3lv02d_add,
+ .remove = lis3lv02d_remove,
+ .suspend = lis3lv02d_suspend,
+ .resume = lis3lv02d_resume,
+ }
+};
+
+static int __init lis3lv02d_init_module(void)
+{
+ int ret;
+
+ if (acpi_disabled)
+ return -ENODEV;
+
+ ret = acpi_bus_register_driver(&lis3lv02d_driver);
+ if (ret < 0)
+ return ret;
+
+ printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
+
+ return 0;
+}
+
+static void __exit lis3lv02d_exit_module(void)
+{
+ acpi_bus_unregister_driver(&lis3lv02d_driver);
+}
+
+MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS");
+MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
+MODULE_LICENSE("GPL");
+
+module_init(lis3lv02d_init_module);
+module_exit(lis3lv02d_exit_module);
+