[PATCH 40/41] sony-laptop: allow complex per-value input/output validation

Len Brown
2007-02-13T05:50:31Z

From: Mattia Dongili <malattia@linux.it>

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>
---
drivers/misc/sony-laptop.c | 81 +++++++++++++++++++++++++++++++++----------
1 files changed, 62 insertions(+), 19 deletions(-)

diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index d7b5330..cabbed0 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -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
};

@@ -190,6 +194,41 @@ static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
}

/*
+ * 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
*/
static ssize_t sony_acpi_show(struct device *dev, struct device_attribute *attr,
@@ -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;
--
1.5.0.rc4.345.gb4d2