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hp-wmi: add supports for POST code error 

HP laptops include a POST code error query 0x2A that reports
which point BIOS fails to boot at. The error code is kept in CMOS
until it is cleared.

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Alex Hung 2013-06-13 16:46:25 +08:00 committed by Matthew Garrett
parent e8f56c80ae
commit 8667ca9518
1 changed files with 47 additions and 0 deletions
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47
drivers/platform/x86/hp-wmi.c
View File

@ -56,6 +56,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
#define HPWMI_BIOS_QUERY 0x9
#define HPWMI_HOTKEY_QUERY 0xc
#define HPWMI_WIRELESS2_QUERY 0x1b
#define HPWMI_POSTCODEERROR_QUERY 0x2a
enum hp_wmi_radio {
HPWMI_WIFI = 0,
@ -400,6 +401,16 @@ static int hp_wmi_rfkill2_refresh(void)
return 0;
}
static int hp_wmi_post_code_state(void)
{
int state = 0;
int ret = hp_wmi_perform_query(HPWMI_POSTCODEERROR_QUERY, 0, &state,
sizeof(state), sizeof(state));
if (ret)
return -EINVAL;
return state;
}
static ssize_t show_display(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -445,6 +456,16 @@ static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "%d\n", value);
}
static ssize_t show_postcode(struct device *dev, struct device_attribute *attr,
char *buf)
{
/* Get the POST error code of previous boot failure. */
int value = hp_wmi_post_code_state();
if (value < 0)
return -EINVAL;
return sprintf(buf, "0x%x\n", value);
}
static ssize_t set_als(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@ -457,11 +478,33 @@ static ssize_t set_als(struct device *dev, struct device_attribute *attr,
return count;
}
static ssize_t set_postcode(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
u32 tmp;
long unsigned int tmp2;
ret = kstrtoul(buf, 10, &tmp2);
if (ret || tmp2 != 1)
return -EINVAL;
/* Clear the POST error code. It is kept until until cleared. */
tmp = (u32) tmp2;
ret = hp_wmi_perform_query(HPWMI_POSTCODEERROR_QUERY, 1, &tmp,
sizeof(tmp), sizeof(tmp));
if (ret)
return -EINVAL;
return count;
}
static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
static DEVICE_ATTR(postcode, S_IRUGO | S_IWUSR, show_postcode, set_postcode);
static void hp_wmi_notify(u32 value, void *context)
{
@ -642,6 +685,7 @@ static void cleanup_sysfs(struct platform_device *device)
device_remove_file(&device->dev, &dev_attr_als);
device_remove_file(&device->dev, &dev_attr_dock);
device_remove_file(&device->dev, &dev_attr_tablet);
device_remove_file(&device->dev, &dev_attr_postcode);
}
static int hp_wmi_rfkill_setup(struct platform_device *device)
@ -857,6 +901,9 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
if (err)
goto add_sysfs_error;
err = device_create_file(&device->dev, &dev_attr_tablet);
if (err)
goto add_sysfs_error;
err = device_create_file(&device->dev, &dev_attr_postcode);
if (err)
goto add_sysfs_error;
return 0;