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linux/drivers/hwmon/hp_accel.c

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/*
* hp_accel.c - Interface between LIS3LV02DL driver and HP ACPI BIOS
*
* Copyright (C) 2007-2008 Yan Burman
* Copyright (C) 2008 Eric Piel
* Copyright (C) 2008-2009 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/uaccess.h>
#include <linux/leds.h>
#include <acpi/acpi_drivers.h>
#include <asm/atomic.h>
#include "lis3lv02d.h"
#define DRIVER_NAME "lis3lv02d"
#define ACPI_MDPS_CLASS "accelerometer"
/* Delayed LEDs infrastructure ------------------------------------ */
/* Special LED class that can defer work */
struct delayed_led_classdev {
struct led_classdev led_classdev;
struct work_struct work;
enum led_brightness new_brightness;
unsigned int led; /* For driver */
void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
};
static inline void delayed_set_status_worker(struct work_struct *work)
{
struct delayed_led_classdev *data =
container_of(work, struct delayed_led_classdev, work);
data->set_brightness(data, data->new_brightness);
}
static inline void delayed_sysfs_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct delayed_led_classdev *data = container_of(led_cdev,
struct delayed_led_classdev, led_classdev);
data->new_brightness = brightness;
schedule_work(&data->work);
}
/* HP-specific accelerometer driver ------------------------------------ */
/* 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.
* @lis3: pointer to the device struct
*
* Returns 0 on success.
*/
int lis3lv02d_acpi_init(struct lis3lv02d *lis3)
{
struct acpi_device *dev = lis3->bus_priv;
if (acpi_evaluate_object(dev->handle, METHOD_NAME__INI,
NULL, NULL) != AE_OK)
return -EINVAL;
return 0;
}
/**
* lis3lv02d_acpi_read - ACPI ALRD method: read a register
* @lis3: pointer to the device struct
* @reg: the register to read
* @ret: result of the operation
*
* Returns 0 on success.
*/
int lis3lv02d_acpi_read(struct lis3lv02d *lis3, int reg, u8 *ret)
{
struct acpi_device *dev = lis3->bus_priv;
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(dev->handle, "ALRD", &args, &lret);
*ret = lret;
return (status != AE_OK) ? -EINVAL : 0;
}
/**
* lis3lv02d_acpi_write - ACPI ALWR method: write to a register
* @lis3: pointer to the device struct
* @reg: the register to write to
* @val: the value to write
*
* Returns 0 on success.
*/
int lis3lv02d_acpi_write(struct lis3lv02d *lis3, int reg, u8 val)
{
struct acpi_device *dev = lis3->bus_priv;
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;
if (acpi_evaluate_integer(dev->handle, "ALWR", &args, &ret) != AE_OK)
return -EINVAL;
return 0;
}
static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
{
lis3_dev.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_rotated_left_usd = {-2, 1, -3};
static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
static struct axis_conversion lis3lv02d_axis_xy_rotated_right = {2, -1, 3};
static struct axis_conversion lis3lv02d_axis_xy_swap_yz_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 \
}
#define AXIS_DMI_MATCH2(_ident, _class1, _name1, \
_class2, _name2, \
_axis) { \
.ident = _ident, \
.callback = lis3lv02d_dmi_matched, \
.matches = { \
DMI_MATCH(DMI_##_class1, _name1), \
DMI_MATCH(DMI_##_class2, _name2), \
}, \
.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),
AXIS_DMI_MATCH("HP2140", "HP 2140", xy_swap_inverted),
AXIS_DMI_MATCH("NC653x", "HP Compaq 653", xy_rotated_left_usd),
AXIS_DMI_MATCH("NC673x", "HP Compaq 673", xy_rotated_left_usd),
AXIS_DMI_MATCH("NC651xx", "HP Compaq 651", xy_rotated_right),
AXIS_DMI_MATCH("NC671xx", "HP Compaq 671", xy_swap_yz_inverted),
/* Intel-based HP Pavilion dv5 */
AXIS_DMI_MATCH2("HPDV5_I",
PRODUCT_NAME, "HP Pavilion dv5",
BOARD_NAME, "3603",
x_inverted),
/* AMD-based HP Pavilion dv5 */
AXIS_DMI_MATCH2("HPDV5_A",
PRODUCT_NAME, "HP Pavilion dv5",
BOARD_NAME, "3600",
y_inverted),
AXIS_DMI_MATCH("DV7", "HP Pavilion dv7", x_inverted),
AXIS_DMI_MATCH("HP8710", "HP Compaq 8710", y_inverted),
{ NULL, }
/* Laptop models without axis info (yet):
* "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 void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
{
struct acpi_device *dev = lis3_dev.bus_priv;
unsigned long 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 = !!value;
acpi_evaluate_integer(dev->handle, "ALED", &args, &ret);
}
static struct delayed_led_classdev hpled_led = {
.led_classdev = {
.name = "hp::hddprotect",
.default_trigger = "none",
.brightness_set = delayed_sysfs_set,
.flags = LED_CORE_SUSPENDRESUME,
},
.set_brightness = hpled_set,
};
static acpi_status
lis3lv02d_get_resource(struct acpi_resource *resource, void *context)
{
if (resource->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
struct acpi_resource_extended_irq *irq;
u32 *device_irq = context;
irq = &resource->data.extended_irq;
*device_irq = irq->interrupts[0];
}
return AE_OK;
}
static void lis3lv02d_enum_resources(struct acpi_device *device)
{
acpi_status status;
status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
lis3lv02d_get_resource, &lis3_dev.irq);
if (ACPI_FAILURE(status))
printk(KERN_DEBUG DRIVER_NAME ": Error getting resources\n");
}
static int lis3lv02d_add(struct acpi_device *device)
{
int ret;
if (!device)
return -EINVAL;
lis3_dev.bus_priv = device;
lis3_dev.init = lis3lv02d_acpi_init;
lis3_dev.read = lis3lv02d_acpi_read;
lis3_dev.write = lis3lv02d_acpi_write;
strcpy(acpi_device_name(device), DRIVER_NAME);
strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
device->driver_data = &lis3_dev;
/* obtain IRQ number of our device from ACPI */
lis3lv02d_enum_resources(device);
/* 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");
lis3_dev.ac = lis3lv02d_axis_normal;
}
/* call the core layer do its init */
ret = lis3lv02d_init_device(&lis3_dev);
if (ret)
return ret;
INIT_WORK(&hpled_led.work, delayed_set_status_worker);
ret = led_classdev_register(NULL, &hpled_led.led_classdev);
if (ret) {
lis3lv02d_joystick_disable();
lis3lv02d_poweroff(&lis3_dev);
flush_work(&hpled_led.work);
return ret;
}
return ret;
}
static int lis3lv02d_remove(struct acpi_device *device, int type)
{
if (!device)
return -EINVAL;
lis3lv02d_joystick_disable();
lis3lv02d_poweroff(&lis3_dev);
flush_work(&hpled_led.work);
led_classdev_unregister(&hpled_led.led_classdev);
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(&lis3_dev);
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(&lis3_dev.lock);
if (lis3_dev.usage > 0)
lis3lv02d_poweron(&lis3_dev);
else
lis3lv02d_poweroff(&lis3_dev);
mutex_unlock(&lis3_dev.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 and support for disk protection LED.");
MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
MODULE_LICENSE("GPL");
module_init(lis3lv02d_init_module);
module_exit(lis3lv02d_exit_module);
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