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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>
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33989ba6f7
@ -177,9 +177,15 @@ MODULE_PARM_DESC(wwan_status, "Set the wireless status on boot "
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/* For Pegatron Lucid tablet */
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#define DEVICE_NAME_PEGA "Lucid"
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#define METHOD_PEGA_ENABLE "ENPR"
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#define METHOD_PEGA_DISABLE "DAPR"
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#define PEGA_ALS 0x04
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#define PEGA_ALS_POWER 0x05
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#define METHOD_PEGA_READ "RDLN"
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#define PEGA_READ_ALS_H 0x02
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#define PEGA_READ_ALS_L 0x03
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/*
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* Define a specific led structure to keep the main structure clean
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@ -340,6 +346,12 @@ static bool asus_check_pega_lucid(struct asus_laptop *asus)
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!acpi_check_handle(asus->handle, METHOD_PEGA_READ, NULL);
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}
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static int asus_pega_lucid_set(struct asus_laptop *asus, int unit, bool enable)
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{
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char *method = enable ? METHOD_PEGA_ENABLE : METHOD_PEGA_DISABLE;
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return write_acpi_int(asus->handle, method, unit);
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}
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/* Generic LED function */
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static int asus_led_set(struct asus_laptop *asus, const char *method,
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int value)
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@ -924,8 +936,18 @@ static ssize_t store_disp(struct device *dev, struct device_attribute *attr,
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*/
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static void asus_als_switch(struct asus_laptop *asus, int value)
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{
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if (write_acpi_int(asus->handle, METHOD_ALS_CONTROL, value))
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pr_warn("Error setting light sensor switch\n");
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int ret;
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if (asus->is_pega_lucid) {
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ret = asus_pega_lucid_set(asus, PEGA_ALS, value);
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if (!ret)
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ret = asus_pega_lucid_set(asus, PEGA_ALS_POWER, value);
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} else {
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ret = write_acpi_int(asus->handle, METHOD_ALS_CONTROL, value);
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}
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if (ret)
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pr_warning("Error setting light sensor switch\n");
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asus->light_switch = value;
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}
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@ -981,6 +1003,35 @@ static ssize_t store_lslvl(struct device *dev, struct device_attribute *attr,
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return rv;
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}
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static int pega_int_read(struct asus_laptop *asus, int arg, int *result)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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int err = write_acpi_int_ret(asus->handle, METHOD_PEGA_READ, arg,
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&buffer);
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if (!err) {
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union acpi_object *obj = buffer.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER)
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*result = obj->integer.value;
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else
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err = -EIO;
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}
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return err;
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}
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static ssize_t show_lsvalue(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct asus_laptop *asus = dev_get_drvdata(dev);
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int err, hi, lo;
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err = pega_int_read(asus, PEGA_READ_ALS_H, &hi);
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if (!err)
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err = pega_int_read(asus, PEGA_READ_ALS_L, &lo);
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if (!err)
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return sprintf(buf, "%d\n", 10 * hi + lo);
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return err;
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}
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/*
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* GPS
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*/
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@ -1169,6 +1220,7 @@ static DEVICE_ATTR(wimax, S_IRUGO | S_IWUSR, show_wimax, store_wimax);
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static DEVICE_ATTR(wwan, S_IRUGO | S_IWUSR, show_wwan, store_wwan);
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static DEVICE_ATTR(display, S_IWUSR, NULL, store_disp);
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static DEVICE_ATTR(ledd, S_IRUGO | S_IWUSR, show_ledd, store_ledd);
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static DEVICE_ATTR(ls_value, S_IRUGO, show_lsvalue, NULL);
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static DEVICE_ATTR(ls_level, S_IRUGO | S_IWUSR, show_lslvl, store_lslvl);
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static DEVICE_ATTR(ls_switch, S_IRUGO | S_IWUSR, show_lssw, store_lssw);
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static DEVICE_ATTR(gps, S_IRUGO | S_IWUSR, show_gps, store_gps);
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@ -1181,6 +1233,7 @@ static struct attribute *asus_attributes[] = {
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&dev_attr_wwan.attr,
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&dev_attr_display.attr,
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&dev_attr_ledd.attr,
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&dev_attr_ls_value.attr,
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&dev_attr_ls_level.attr,
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&dev_attr_ls_switch.attr,
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&dev_attr_gps.attr,
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@ -1197,6 +1250,19 @@ static mode_t asus_sysfs_is_visible(struct kobject *kobj,
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acpi_handle handle = asus->handle;
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bool supported;
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if (asus->is_pega_lucid) {
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/* no ls_level interface on the Lucid */
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if (attr == &dev_attr_ls_switch.attr)
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supported = true;
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else if (attr == &dev_attr_ls_level.attr)
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supported = false;
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else
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goto normal;
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return supported;
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}
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normal:
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if (attr == &dev_attr_wlan.attr) {
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supported = !acpi_check_handle(handle, METHOD_WLAN, NULL);
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@ -1220,6 +1286,8 @@ static mode_t asus_sysfs_is_visible(struct kobject *kobj,
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attr == &dev_attr_ls_level.attr) {
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supported = !acpi_check_handle(handle, METHOD_ALS_CONTROL, NULL) &&
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!acpi_check_handle(handle, METHOD_ALS_LEVEL, NULL);
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} else if (attr == &dev_attr_ls_value.attr) {
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supported = asus->is_pega_lucid;
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} else if (attr == &dev_attr_gps.attr) {
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supported = !acpi_check_handle(handle, METHOD_GPS_ON, NULL) &&
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!acpi_check_handle(handle, METHOD_GPS_OFF, NULL) &&
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@ -1407,7 +1475,9 @@ static int __devinit asus_acpi_init(struct asus_laptop *asus)
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asus->light_switch = 0; /* Default to light sensor disabled */
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asus->light_level = 5; /* level 5 for sensor sensitivity */
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if (!acpi_check_handle(asus->handle, METHOD_ALS_CONTROL, NULL) &&
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if (asus->is_pega_lucid) {
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asus_als_switch(asus, asus->light_switch);
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} else if (!acpi_check_handle(asus->handle, METHOD_ALS_CONTROL, NULL) &&
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!acpi_check_handle(asus->handle, METHOD_ALS_LEVEL, NULL)) {
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asus_als_switch(asus, asus->light_switch);
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asus_als_level(asus, asus->light_level);
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