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kernel-fxtec-pro1x/drivers/hwmon/hp_accel.c
Eric Piel a002ee896d lis3: remove automatic shutdown of the device 
After measurement on my laptop, it seems that turning off the device does
not bring any energy saving (within 0.1W precision).  So let's keep the
device always on.  It simplifies the code, and it avoids the problem of
reading a wrong value sometimes just after turning the device on.

Moreover, since commit ef2cfc790b had been
too zealous, the device was actually never turned off anyway.  This patch
also restores the damages done by this commit concerning the
initialisation/poweroff.

Also do more clean up with the usage of the lis3_dev global variable.

Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:57 -07:00

389 lines
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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(&lis3_dev);
}
#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)
{
lis3lv02d_poweron(&lis3_dev);
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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