diff options
| author | Alex Hung <alex.hung@canonical.com> | 2013-06-13 16:46:25 +0800 |
|---|---|---|
| committer | Matthew Garrett <matthew.garrett@nebula.com> | 2013-07-10 15:42:48 -0400 |
| commit | 8667ca9518bbe0eff2222e69d611f4c8549fcbde (patch) | |
| tree | 80fca0c4e3433ab2d0639791a02161f470d7d8cc /drivers/platform | |
| parent | e8f56c80aedacfb1552509c0e4ed265266328bc4 (diff) | |
| download | lwn-8667ca9518bbe0eff2222e69d611f4c8549fcbde.tar.gz lwn-8667ca9518bbe0eff2222e69d611f4c8549fcbde.zip | |
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>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/hp-wmi.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c index 6e142c3b5e97..97bb05edcb5a 100644 --- a/drivers/platform/x86/hp-wmi.c +++ b/drivers/platform/x86/hp-wmi.c @@ -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) @@ -859,6 +903,9 @@ static int __init hp_wmi_bios_setup(struct platform_device *device) 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; add_sysfs_error: |