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asus-laptop: Pegatron Lucid ALS sensor 

Ambient light sensor for Pegatron Lucid.  Supports pre-existing
ls_switch sysfs interface to en/disable automatic control, and exports
the brightness from the device as "ls_value".

Signed-off-by: Andy Ross <andy.ross@windriver.com>
Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Andy Ross 2011-10-14 11:13:36 +02:00 committed by Matthew Garrett
parent 8819de7f98
commit 33989ba6f7
1 changed files with 75 additions and 5 deletions
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80
drivers/platform/x86/asus-laptop.c
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@ -177,9 +177,15 @@ MODULE_PARM_DESC(wwan_status, "Set the wireless status on boot "
/* For Pegatron Lucid tablet */
#define DEVICE_NAME_PEGA "Lucid"
#define METHOD_PEGA_ENABLE "ENPR"
#define METHOD_PEGA_DISABLE "DAPR"
#define PEGA_ALS 0x04
#define PEGA_ALS_POWER 0x05
#define METHOD_PEGA_READ "RDLN"
#define PEGA_READ_ALS_H 0x02
#define PEGA_READ_ALS_L 0x03
/*
* Define a specific led structure to keep the main structure clean
@ -340,6 +346,12 @@ 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)
@ -924,8 +936,18 @@ 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))
pr_warn("Error setting light sensor switch\n");
int ret;
if (asus->is_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;
}
@ -981,6 +1003,35 @@ 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
*/
@ -1169,6 +1220,7 @@ 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_IWUSR, NULL, 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);
@ -1181,6 +1233,7 @@ 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,
@ -1197,6 +1250,19 @@ static mode_t asus_sysfs_is_visible(struct kobject *kobj,
acpi_handle handle = asus->handle;
bool supported;
if (asus->is_pega_lucid) {
/* no ls_level interface on the Lucid */
if (attr == &dev_attr_ls_switch.attr)
supported = true;
else if (attr == &dev_attr_ls_level.attr)
supported = false;
else
goto normal;
return supported;
}
normal:
if (attr == &dev_attr_wlan.attr) {
supported = !acpi_check_handle(handle, METHOD_WLAN, NULL);
@ -1219,7 +1285,9 @@ 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);
!acpi_check_handle(handle, METHOD_ALS_LEVEL, NULL);
} else if (attr == &dev_attr_ls_value.attr) {
supported = asus->is_pega_lucid;
} else if (attr == &dev_attr_gps.attr) {
supported = !acpi_check_handle(handle, METHOD_GPS_ON, NULL) &&
!acpi_check_handle(handle, METHOD_GPS_OFF, NULL) &&
@ -1407,8 +1475,10 @@ 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->is_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);
}