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sony-laptop: allow complex per-value input/output validation 

Replace sony_acpi_value.{min,max} with a callback function that allows
more complex reasoning in accepting input and presenting output.

This allows consistency between the sony-laptop specific 'brightness_default'
and the backlight subsystem 0-based 'brightness'.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Mattia Dongili 2007-02-12 22:01:07 +01:00 committed by Len Brown
parent 0d477faca3
commit 156c221b72
1 changed files with 62 additions and 19 deletions
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81
drivers/misc/sony-laptop.c
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@ -58,13 +58,17 @@ static ssize_t sony_acpi_show(struct device *, struct device_attribute *,
char *);
static ssize_t sony_acpi_store(struct device *, struct device_attribute *,
const char *, size_t);
static int boolean_validate(const int, const int);
static int brightness_default_validate(const int, const int);
#define SNC_VALIDATE_IN 0
#define SNC_VALIDATE_OUT 1
struct sony_acpi_value {
char *name; /* name of the entry */
char **acpiget; /* names of the ACPI get function */
char **acpiset; /* names of the ACPI set function */
int min; /* minimum allowed value or -1 */
int max; /* maximum allowed value or -1 */
int (*validate)(const int, const int); /* input/output validation */
int value; /* current setting */
int valid; /* Has ever been set */
int debug; /* active only in debug mode ? */
@ -74,13 +78,12 @@ struct sony_acpi_value {
#define HANDLE_NAMES(_name, _values...) \
static char *snc_##_name[] = { _values, NULL }
#define SONY_ACPI_VALUE(_name, _getters, _setters, _min, _max, _debug) \
#define SONY_ACPI_VALUE(_name, _getters, _setters, _validate, _debug) \
{ \
.name = __stringify(_name), \
.acpiget = _getters, \
.acpiset = _setters, \
.min = _min, \
.max = _max, \
.validate = _validate, \
.debug = _debug, \
.devattr = __ATTR(_name, 0, sony_acpi_show, sony_acpi_store), \
}
@ -114,17 +117,18 @@ HANDLE_NAMES(CMI_set, "SCMI");
static struct sony_acpi_value sony_acpi_values[] = {
SONY_ACPI_VALUE(brightness_default, snc_brightness_def_get,
snc_brightness_def_set, 1, SONY_MAX_BRIGHTNESS, 0),
SONY_ACPI_VALUE(fnkey, snc_fnkey_get, NULL, -1, -1, 0),
SONY_ACPI_VALUE(cdpower, snc_cdpower_get, snc_cdpower_set, 0, 1, 0),
SONY_ACPI_VALUE(audiopower, snc_audiopower_get, snc_audiopower_set, 0,
1, 0),
SONY_ACPI_VALUE(lanpower, snc_lanpower_get, snc_lanpower_set, 0, 1, 1),
snc_brightness_def_set, brightness_default_validate, 0),
SONY_ACPI_VALUE(fnkey, snc_fnkey_get, NULL, NULL, 0),
SONY_ACPI_VALUE(cdpower, snc_cdpower_get, snc_cdpower_set, boolean_validate, 0),
SONY_ACPI_VALUE(audiopower, snc_audiopower_get, snc_audiopower_set,
boolean_validate, 0),
SONY_ACPI_VALUE(lanpower, snc_lanpower_get, snc_lanpower_set,
boolean_validate, 1),
/* unknown methods */
SONY_ACPI_VALUE(PID, snc_PID_get, NULL, -1, -1, 1),
SONY_ACPI_VALUE(CTR, snc_CTR_get, snc_CTR_set, -1, -1, 1),
SONY_ACPI_VALUE(PCR, snc_PCR_get, snc_PCR_set, -1, -1, 1),
SONY_ACPI_VALUE(CMI, snc_CMI_get, snc_CMI_set, -1, -1, 1),
SONY_ACPI_VALUE(PID, snc_PID_get, NULL, NULL, 1),
SONY_ACPI_VALUE(CTR, snc_CTR_get, snc_CTR_set, NULL, 1),
SONY_ACPI_VALUE(PCR, snc_PCR_get, snc_PCR_set, NULL, 1),
SONY_ACPI_VALUE(CMI, snc_CMI_get, snc_CMI_set, NULL, 1),
SONY_ACPI_VALUE_NULL
};
@ -189,6 +193,41 @@ static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
return -1;
}
/*
* sony_acpi_values input/output validate functions
*/
/* brightness_default_validate:
*
* manipulate input output values to keep consistency with the
* backlight framework for which brightness values are 0-based.
*/
static int brightness_default_validate(const int direction, const int value)
{
switch (direction) {
case SNC_VALIDATE_OUT:
return value - 1;
case SNC_VALIDATE_IN:
if (value >= 0 && value < SONY_MAX_BRIGHTNESS)
return value + 1;
}
return -EINVAL;
}
/* boolean_validate:
*
* on input validate boolean values 0/1, on output just pass the
* received value.
*/
static int boolean_validate(const int direction, const int value)
{
if (direction == SNC_VALIDATE_IN) {
if (value != 0 && value != 1)
return -EINVAL;
}
return value;
}
/*
* Sysfs show/store common to all sony_acpi_values
*/
@ -205,6 +244,9 @@ static ssize_t sony_acpi_show(struct device *dev, struct device_attribute *attr,
if (acpi_callgetfunc(sony_acpi_handle, *item->acpiget, &value) < 0)
return -EIO;
if (item->validate)
value = item->validate(SNC_VALIDATE_OUT, value);
return snprintf(buffer, PAGE_SIZE, "%d\n", value);
}
@ -224,10 +266,11 @@ static ssize_t sony_acpi_store(struct device *dev,
value = simple_strtoul(buffer, NULL, 10);
if (item->min != -1 && value < item->min)
return -EINVAL;
if (item->max != -1 && value > item->max)
return -EINVAL;
if (item->validate)
value = item->validate(SNC_VALIDATE_IN, value);
if (value < 0)
return value;
if (acpi_callsetfunc(sony_acpi_handle, *item->acpiset, value, NULL) < 0)
return -EIO;