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Commit 33989ba6 authored by Andy Ross's avatar Andy Ross Committed by Matthew Garrett
Browse files

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: default avatarAndy Ross <andy.ross@windriver.com>
Signed-off-by: default avatarCorentin Chary <corentin.chary@gmail.com>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
parent 8819de7f

drivers/platform/x86/asus-laptop.c

+75 −5
Original line number Diff line number Diff line
@@ -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);
@@ -1220,6 +1286,8 @@ static mode_t asus_sysfs_is_visible(struct kobject *kobj, 
		   attr == &dev_attr_ls_level.attr) {

		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->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) &&
@@ -1407,7 +1475,9 @@ 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) &&

	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);