Add support for the ambient light sensor on the Pegatron Lucid tablet.
This uses a different inteface but the same sysfs interface for
ls_switch, has no equivalent to the existing ls_value threshold
setting, and exports the actual brightness via a new attribute
"ls_value".
Signed-off-by: Andy Ross <andy.ross@xxxxxxxxxxxxx>
---
drivers/platform/x86/asus-laptop.c | 64 +++++++++++++++++++++++++++++++++---
1 files changed, 59 insertions(+), 5 deletions(-)
diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index 6f542af..b397a4c 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -383,6 +383,12 @@ static bool asus_check_pega_lucid(struct asus_laptop *asus)
!acpi_check_handle(asus->handle, METHOD_PEGA_READ, NULL);
}
+static int asus_pega_lucid_set(struct asus_laptop *asus, int unit, bool enable)
+{
+ char *method = enable ? METHOD_PEGA_ENABLE : METHOD_PEGA_DISABLE;
+ return write_acpi_int(asus->handle, method, unit);
+}
+
/* Generic LED function */
static int asus_led_set(struct asus_laptop *asus, const char *method,
int value)
@@ -1051,7 +1057,15 @@ static ssize_t store_disp(struct device *dev, struct device_attribute *attr,
*/
static void asus_als_switch(struct asus_laptop *asus, int value)
{
- if (write_acpi_int(asus->handle, METHOD_ALS_CONTROL, value))
+ int ret;
+ if (asus->have_pega_lucid) {
+ ret = asus_pega_lucid_set(asus, PEGA_ALS, value);
+ if (!ret)
+ ret = asus_pega_lucid_set(asus, PEGA_ALS_POWER, value);
+ } else {
+ ret = write_acpi_int(asus->handle, METHOD_ALS_CONTROL, value);
+ }
+ if (ret)
pr_warning("Error setting light sensor switch\n");
asus->light_switch = value;
}
@@ -1108,6 +1122,35 @@ static ssize_t store_lslvl(struct device *dev, struct device_attribute *attr,
return rv;
}
+static int pega_int_read(struct asus_laptop *asus, int arg, int *result)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ int err = write_acpi_int_ret(asus->handle, METHOD_PEGA_READ, arg,
+ &buffer);
+ if (!err) {
+ union acpi_object *obj = buffer.pointer;
+ if (obj && obj->type == ACPI_TYPE_INTEGER)
+ *result = obj->integer.value;
+ else
+ err = -EIO;
+ }
+ return err;
+}
+
+static ssize_t show_lsvalue(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_laptop *asus = dev_get_drvdata(dev);
+ int err, hi, lo;
+
+ err = pega_int_read(asus, PEGA_READ_ALS_H, &hi);
+ if (!err)
+ err = pega_int_read(asus, PEGA_READ_ALS_L, &lo);
+ if (!err)
+ return sprintf(buf, "%d\n", 10 * hi + lo);
+ return err;
+}
+
/*
* GPS
*/
@@ -1305,6 +1348,7 @@ static DEVICE_ATTR(wimax, S_IRUGO | S_IWUSR, show_wimax, store_wimax);
static DEVICE_ATTR(wwan, S_IRUGO | S_IWUSR, show_wwan, store_wwan);
static DEVICE_ATTR(display, S_IRUGO | S_IWUSR, show_disp, store_disp);
static DEVICE_ATTR(ledd, S_IRUGO | S_IWUSR, show_ledd, store_ledd);
+static DEVICE_ATTR(ls_value, S_IRUGO, show_lsvalue, NULL);
static DEVICE_ATTR(ls_level, S_IRUGO | S_IWUSR, show_lslvl, store_lslvl);
static DEVICE_ATTR(ls_switch, S_IRUGO | S_IWUSR, show_lssw, store_lssw);
static DEVICE_ATTR(gps, S_IRUGO | S_IWUSR, show_gps, store_gps);
@@ -1317,6 +1361,7 @@ static struct attribute *asus_attributes[] = {
&dev_attr_wwan.attr,
&dev_attr_display.attr,
&dev_attr_ledd.attr,
+ &dev_attr_ls_value.attr,
&dev_attr_ls_level.attr,
&dev_attr_ls_switch.attr,
&dev_attr_gps.attr,
@@ -1354,8 +1399,15 @@ static mode_t asus_sysfs_is_visible(struct kobject *kobj,
} else if (attr == &dev_attr_ls_switch.attr ||
attr == &dev_attr_ls_level.attr) {
- supported = !acpi_check_handle(handle, METHOD_ALS_CONTROL, NULL) &&
- !acpi_check_handle(handle, METHOD_ALS_LEVEL, NULL);
+ if (asus_check_pega_lucid(asus)) {
+ /* no ls_level interface on the Lucid */
+ supported = attr == &dev_attr_ls_switch.attr;
+ } else {
+ supported = !acpi_check_handle(handle, METHOD_ALS_CONTROL, NULL) &&
+ !acpi_check_handle(handle, METHOD_ALS_LEVEL, NULL);
+ }
+ } else if (attr == &dev_attr_ls_value.attr) {
+ supported = asus_check_pega_lucid(asus);
} else if (attr == &dev_attr_gps.attr) {
supported = !acpi_check_handle(handle, METHOD_GPS_ON, NULL) &&
!acpi_check_handle(handle, METHOD_GPS_OFF, NULL) &&
@@ -1567,8 +1619,10 @@ static int __devinit asus_acpi_init(struct asus_laptop *asus)
asus->light_switch = 0; /* Default to light sensor disabled */
asus->light_level = 5; /* level 5 for sensor sensitivity */
- if (!acpi_check_handle(asus->handle, METHOD_ALS_CONTROL, NULL) &&
- !acpi_check_handle(asus->handle, METHOD_ALS_LEVEL, NULL)) {
+ if (asus->have_pega_lucid) {
+ asus_als_switch(asus, asus->light_switch);
+ } else if (!acpi_check_handle(asus->handle, METHOD_ALS_CONTROL, NULL) &&
+ !acpi_check_handle(asus->handle, METHOD_ALS_LEVEL, NULL)) {
asus_als_switch(asus, asus->light_switch);
asus_als_level(asus, asus->light_level);
}
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
