[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/video/backlight/backlight.c b/src/kernel/linux/v4.19/drivers/video/backlight/backlight.c
new file mode 100644
index 0000000..deb824b
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/video/backlight/backlight.c
@@ -0,0 +1,688 @@
+/*
+ * Backlight Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/backlight.h>
+#include <linux/notifier.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
+
+static struct list_head backlight_dev_list;
+static struct mutex backlight_dev_list_mutex;
+static struct blocking_notifier_head backlight_notifier;
+
+static const char *const backlight_types[] = {
+ [BACKLIGHT_RAW] = "raw",
+ [BACKLIGHT_PLATFORM] = "platform",
+ [BACKLIGHT_FIRMWARE] = "firmware",
+};
+
+#if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
+ defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
+/* This callback gets called when something important happens inside a
+ * framebuffer driver. We're looking if that important event is blanking,
+ * and if it is and necessary, we're switching backlight power as well ...
+ */
+static int fb_notifier_callback(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ struct backlight_device *bd;
+ struct fb_event *evdata = data;
+ int node = evdata->info->node;
+ int fb_blank = 0;
+
+ /* If we aren't interested in this event, skip it immediately ... */
+ if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK)
+ return 0;
+
+ bd = container_of(self, struct backlight_device, fb_notif);
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops)
+ if (!bd->ops->check_fb ||
+ bd->ops->check_fb(bd, evdata->info)) {
+ fb_blank = *(int *)evdata->data;
+ if (fb_blank == FB_BLANK_UNBLANK &&
+ !bd->fb_bl_on[node]) {
+ bd->fb_bl_on[node] = true;
+ if (!bd->use_count++) {
+ bd->props.state &= ~BL_CORE_FBBLANK;
+ bd->props.fb_blank = FB_BLANK_UNBLANK;
+ backlight_update_status(bd);
+ }
+ } else if (fb_blank != FB_BLANK_UNBLANK &&
+ bd->fb_bl_on[node]) {
+ bd->fb_bl_on[node] = false;
+ if (!(--bd->use_count)) {
+ bd->props.state |= BL_CORE_FBBLANK;
+ bd->props.fb_blank = fb_blank;
+ backlight_update_status(bd);
+ }
+ }
+ }
+ mutex_unlock(&bd->ops_lock);
+ return 0;
+}
+
+static int backlight_register_fb(struct backlight_device *bd)
+{
+ memset(&bd->fb_notif, 0, sizeof(bd->fb_notif));
+ bd->fb_notif.notifier_call = fb_notifier_callback;
+
+ return fb_register_client(&bd->fb_notif);
+}
+
+static void backlight_unregister_fb(struct backlight_device *bd)
+{
+ fb_unregister_client(&bd->fb_notif);
+}
+#else
+static inline int backlight_register_fb(struct backlight_device *bd)
+{
+ return 0;
+}
+
+static inline void backlight_unregister_fb(struct backlight_device *bd)
+{
+}
+#endif /* CONFIG_FB */
+
+static void backlight_generate_event(struct backlight_device *bd,
+ enum backlight_update_reason reason)
+{
+ char *envp[2];
+
+ switch (reason) {
+ case BACKLIGHT_UPDATE_SYSFS:
+ envp[0] = "SOURCE=sysfs";
+ break;
+ case BACKLIGHT_UPDATE_HOTKEY:
+ envp[0] = "SOURCE=hotkey";
+ break;
+ default:
+ envp[0] = "SOURCE=unknown";
+ break;
+ }
+ envp[1] = NULL;
+ kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp);
+ sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
+}
+
+static ssize_t bl_power_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ return sprintf(buf, "%d\n", bd->props.power);
+}
+
+static ssize_t bl_power_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc;
+ struct backlight_device *bd = to_backlight_device(dev);
+ unsigned long power, old_power;
+
+ rc = kstrtoul(buf, 0, &power);
+ if (rc)
+ return rc;
+
+ rc = -ENXIO;
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops) {
+ pr_debug("set power to %lu\n", power);
+ if (bd->props.power != power) {
+ old_power = bd->props.power;
+ bd->props.power = power;
+ rc = backlight_update_status(bd);
+ if (rc)
+ bd->props.power = old_power;
+ else
+ rc = count;
+ } else {
+ rc = count;
+ }
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ return rc;
+}
+static DEVICE_ATTR_RW(bl_power);
+
+static ssize_t brightness_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ return sprintf(buf, "%d\n", bd->props.brightness);
+}
+
+int backlight_device_set_brightness(struct backlight_device *bd,
+ unsigned long brightness)
+{
+ int rc = -ENXIO;
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops) {
+ if (brightness > bd->props.max_brightness)
+ rc = -EINVAL;
+ else {
+ pr_debug("set brightness to %lu\n", brightness);
+ bd->props.brightness = brightness;
+ rc = backlight_update_status(bd);
+ }
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
+
+ return rc;
+}
+EXPORT_SYMBOL(backlight_device_set_brightness);
+
+static ssize_t brightness_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int rc;
+ struct backlight_device *bd = to_backlight_device(dev);
+ unsigned long brightness;
+
+ rc = kstrtoul(buf, 0, &brightness);
+ if (rc)
+ return rc;
+
+ rc = backlight_device_set_brightness(bd, brightness);
+
+ return rc ? rc : count;
+}
+static DEVICE_ATTR_RW(brightness);
+
+static ssize_t type_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ return sprintf(buf, "%s\n", backlight_types[bd->props.type]);
+}
+static DEVICE_ATTR_RO(type);
+
+static ssize_t max_brightness_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ return sprintf(buf, "%d\n", bd->props.max_brightness);
+}
+static DEVICE_ATTR_RO(max_brightness);
+
+static ssize_t actual_brightness_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int rc = -ENXIO;
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops && bd->ops->get_brightness)
+ rc = sprintf(buf, "%d\n", bd->ops->get_brightness(bd));
+ else
+ rc = sprintf(buf, "%d\n", bd->props.brightness);
+ mutex_unlock(&bd->ops_lock);
+
+ return rc;
+}
+static DEVICE_ATTR_RO(actual_brightness);
+
+static struct class *backlight_class;
+
+#ifdef CONFIG_PM_SLEEP
+static int backlight_suspend(struct device *dev)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
+ bd->props.state |= BL_CORE_SUSPENDED;
+ backlight_update_status(bd);
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ return 0;
+}
+
+static int backlight_resume(struct device *dev)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
+ bd->props.state &= ~BL_CORE_SUSPENDED;
+ backlight_update_status(bd);
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(backlight_class_dev_pm_ops, backlight_suspend,
+ backlight_resume);
+
+static void bl_device_release(struct device *dev)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+ kfree(bd);
+}
+
+static struct attribute *bl_device_attrs[] = {
+ &dev_attr_bl_power.attr,
+ &dev_attr_brightness.attr,
+ &dev_attr_actual_brightness.attr,
+ &dev_attr_max_brightness.attr,
+ &dev_attr_type.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(bl_device);
+
+/**
+ * backlight_force_update - tell the backlight subsystem that hardware state
+ * has changed
+ * @bd: the backlight device to update
+ *
+ * Updates the internal state of the backlight in response to a hardware event,
+ * and generate a uevent to notify userspace
+ */
+void backlight_force_update(struct backlight_device *bd,
+ enum backlight_update_reason reason)
+{
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops && bd->ops->get_brightness)
+ bd->props.brightness = bd->ops->get_brightness(bd);
+ mutex_unlock(&bd->ops_lock);
+ backlight_generate_event(bd, reason);
+}
+EXPORT_SYMBOL(backlight_force_update);
+
+/**
+ * backlight_device_register - create and register a new object of
+ * backlight_device class.
+ * @name: the name of the new object(must be the same as the name of the
+ * respective framebuffer device).
+ * @parent: a pointer to the parent device
+ * @devdata: an optional pointer to be stored for private driver use. The
+ * methods may retrieve it by using bl_get_data(bd).
+ * @ops: the backlight operations structure.
+ *
+ * Creates and registers new backlight device. Returns either an
+ * ERR_PTR() or a pointer to the newly allocated device.
+ */
+struct backlight_device *backlight_device_register(const char *name,
+ struct device *parent, void *devdata, const struct backlight_ops *ops,
+ const struct backlight_properties *props)
+{
+ struct backlight_device *new_bd;
+ int rc;
+
+ pr_debug("backlight_device_register: name=%s\n", name);
+
+ new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL);
+ if (!new_bd)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&new_bd->update_lock);
+ mutex_init(&new_bd->ops_lock);
+
+ new_bd->dev.class = backlight_class;
+ new_bd->dev.parent = parent;
+ new_bd->dev.release = bl_device_release;
+ dev_set_name(&new_bd->dev, "%s", name);
+ dev_set_drvdata(&new_bd->dev, devdata);
+
+ /* Set default properties */
+ if (props) {
+ memcpy(&new_bd->props, props,
+ sizeof(struct backlight_properties));
+ if (props->type <= 0 || props->type >= BACKLIGHT_TYPE_MAX) {
+ WARN(1, "%s: invalid backlight type", name);
+ new_bd->props.type = BACKLIGHT_RAW;
+ }
+ } else {
+ new_bd->props.type = BACKLIGHT_RAW;
+ }
+
+ rc = device_register(&new_bd->dev);
+ if (rc) {
+ put_device(&new_bd->dev);
+ return ERR_PTR(rc);
+ }
+
+ rc = backlight_register_fb(new_bd);
+ if (rc) {
+ device_unregister(&new_bd->dev);
+ return ERR_PTR(rc);
+ }
+
+ new_bd->ops = ops;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ mutex_lock(&pmac_backlight_mutex);
+ if (!pmac_backlight)
+ pmac_backlight = new_bd;
+ mutex_unlock(&pmac_backlight_mutex);
+#endif
+
+ mutex_lock(&backlight_dev_list_mutex);
+ list_add(&new_bd->entry, &backlight_dev_list);
+ mutex_unlock(&backlight_dev_list_mutex);
+
+ blocking_notifier_call_chain(&backlight_notifier,
+ BACKLIGHT_REGISTERED, new_bd);
+
+ return new_bd;
+}
+EXPORT_SYMBOL(backlight_device_register);
+
+struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
+{
+ bool found = false;
+ struct backlight_device *bd;
+
+ mutex_lock(&backlight_dev_list_mutex);
+ list_for_each_entry(bd, &backlight_dev_list, entry) {
+ if (bd->props.type == type) {
+ found = true;
+ break;
+ }
+ }
+ mutex_unlock(&backlight_dev_list_mutex);
+
+ return found ? bd : NULL;
+}
+EXPORT_SYMBOL(backlight_device_get_by_type);
+
+/**
+ * backlight_device_unregister - unregisters a backlight device object.
+ * @bd: the backlight device object to be unregistered and freed.
+ *
+ * Unregisters a previously registered via backlight_device_register object.
+ */
+void backlight_device_unregister(struct backlight_device *bd)
+{
+ if (!bd)
+ return;
+
+ mutex_lock(&backlight_dev_list_mutex);
+ list_del(&bd->entry);
+ mutex_unlock(&backlight_dev_list_mutex);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ mutex_lock(&pmac_backlight_mutex);
+ if (pmac_backlight == bd)
+ pmac_backlight = NULL;
+ mutex_unlock(&pmac_backlight_mutex);
+#endif
+
+ blocking_notifier_call_chain(&backlight_notifier,
+ BACKLIGHT_UNREGISTERED, bd);
+
+ mutex_lock(&bd->ops_lock);
+ bd->ops = NULL;
+ mutex_unlock(&bd->ops_lock);
+
+ backlight_unregister_fb(bd);
+ device_unregister(&bd->dev);
+}
+EXPORT_SYMBOL(backlight_device_unregister);
+
+static void devm_backlight_device_release(struct device *dev, void *res)
+{
+ struct backlight_device *backlight = *(struct backlight_device **)res;
+
+ backlight_device_unregister(backlight);
+}
+
+static int devm_backlight_device_match(struct device *dev, void *res,
+ void *data)
+{
+ struct backlight_device **r = res;
+
+ return *r == data;
+}
+
+/**
+ * backlight_register_notifier - get notified of backlight (un)registration
+ * @nb: notifier block with the notifier to call on backlight (un)registration
+ *
+ * @return 0 on success, otherwise a negative error code
+ *
+ * Register a notifier to get notified when backlight devices get registered
+ * or unregistered.
+ */
+int backlight_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&backlight_notifier, nb);
+}
+EXPORT_SYMBOL(backlight_register_notifier);
+
+/**
+ * backlight_unregister_notifier - unregister a backlight notifier
+ * @nb: notifier block to unregister
+ *
+ * @return 0 on success, otherwise a negative error code
+ *
+ * Register a notifier to get notified when backlight devices get registered
+ * or unregistered.
+ */
+int backlight_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&backlight_notifier, nb);
+}
+EXPORT_SYMBOL(backlight_unregister_notifier);
+
+/**
+ * devm_backlight_device_register - resource managed backlight_device_register()
+ * @dev: the device to register
+ * @name: the name of the device
+ * @parent: a pointer to the parent device
+ * @devdata: an optional pointer to be stored for private driver use
+ * @ops: the backlight operations structure
+ * @props: the backlight properties
+ *
+ * @return a struct backlight on success, or an ERR_PTR on error
+ *
+ * Managed backlight_device_register(). The backlight_device returned
+ * from this function are automatically freed on driver detach.
+ * See backlight_device_register() for more information.
+ */
+struct backlight_device *devm_backlight_device_register(struct device *dev,
+ const char *name, struct device *parent, void *devdata,
+ const struct backlight_ops *ops,
+ const struct backlight_properties *props)
+{
+ struct backlight_device **ptr, *backlight;
+
+ ptr = devres_alloc(devm_backlight_device_release, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ backlight = backlight_device_register(name, parent, devdata, ops,
+ props);
+ if (!IS_ERR(backlight)) {
+ *ptr = backlight;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return backlight;
+}
+EXPORT_SYMBOL(devm_backlight_device_register);
+
+/**
+ * devm_backlight_device_unregister - resource managed backlight_device_unregister()
+ * @dev: the device to unregister
+ * @bd: the backlight device to unregister
+ *
+ * Deallocated a backlight allocated with devm_backlight_device_register().
+ * Normally this function will not need to be called and the resource management
+ * code will ensure that the resource is freed.
+ */
+void devm_backlight_device_unregister(struct device *dev,
+ struct backlight_device *bd)
+{
+ int rc;
+
+ rc = devres_release(dev, devm_backlight_device_release,
+ devm_backlight_device_match, bd);
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL(devm_backlight_device_unregister);
+
+#ifdef CONFIG_OF
+static int of_parent_match(struct device *dev, const void *data)
+{
+ return dev->parent && dev->parent->of_node == data;
+}
+
+/**
+ * of_find_backlight_by_node() - find backlight device by device-tree node
+ * @node: device-tree node of the backlight device
+ *
+ * Returns a pointer to the backlight device corresponding to the given DT
+ * node or NULL if no such backlight device exists or if the device hasn't
+ * been probed yet.
+ *
+ * This function obtains a reference on the backlight device and it is the
+ * caller's responsibility to drop the reference by calling put_device() on
+ * the backlight device's .dev field.
+ */
+struct backlight_device *of_find_backlight_by_node(struct device_node *node)
+{
+ struct device *dev;
+
+ dev = class_find_device(backlight_class, NULL, node, of_parent_match);
+
+ return dev ? to_backlight_device(dev) : NULL;
+}
+EXPORT_SYMBOL(of_find_backlight_by_node);
+#endif
+
+/**
+ * of_find_backlight - Get backlight device
+ * @dev: Device
+ *
+ * This function looks for a property named 'backlight' on the DT node
+ * connected to @dev and looks up the backlight device.
+ *
+ * Call backlight_put() to drop the reference on the backlight device.
+ *
+ * Returns:
+ * A pointer to the backlight device if found.
+ * Error pointer -EPROBE_DEFER if the DT property is set, but no backlight
+ * device is found.
+ * NULL if there's no backlight property.
+ */
+struct backlight_device *of_find_backlight(struct device *dev)
+{
+ struct backlight_device *bd = NULL;
+ struct device_node *np;
+
+ if (!dev)
+ return NULL;
+
+ if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+ np = of_parse_phandle(dev->of_node, "backlight", 0);
+ if (np) {
+ bd = of_find_backlight_by_node(np);
+ of_node_put(np);
+ if (!bd)
+ return ERR_PTR(-EPROBE_DEFER);
+ /*
+ * Note: gpio_backlight uses brightness as
+ * power state during probe
+ */
+ if (!bd->props.brightness)
+ bd->props.brightness = bd->props.max_brightness;
+ }
+ }
+
+ return bd;
+}
+EXPORT_SYMBOL(of_find_backlight);
+
+static void devm_backlight_release(void *data)
+{
+ backlight_put(data);
+}
+
+/**
+ * devm_of_find_backlight - Resource-managed of_find_backlight()
+ * @dev: Device
+ *
+ * Device managed version of of_find_backlight().
+ * The reference on the backlight device is automatically
+ * dropped on driver detach.
+ */
+struct backlight_device *devm_of_find_backlight(struct device *dev)
+{
+ struct backlight_device *bd;
+ int ret;
+
+ bd = of_find_backlight(dev);
+ if (IS_ERR_OR_NULL(bd))
+ return bd;
+ ret = devm_add_action(dev, devm_backlight_release, bd);
+ if (ret) {
+ backlight_put(bd);
+ return ERR_PTR(ret);
+ }
+ return bd;
+}
+EXPORT_SYMBOL(devm_of_find_backlight);
+
+static void __exit backlight_class_exit(void)
+{
+ class_destroy(backlight_class);
+}
+
+static int __init backlight_class_init(void)
+{
+ backlight_class = class_create(THIS_MODULE, "backlight");
+ if (IS_ERR(backlight_class)) {
+ pr_warn("Unable to create backlight class; errno = %ld\n",
+ PTR_ERR(backlight_class));
+ return PTR_ERR(backlight_class);
+ }
+
+ backlight_class->dev_groups = bl_device_groups;
+ backlight_class->pm = &backlight_class_dev_pm_ops;
+ INIT_LIST_HEAD(&backlight_dev_list);
+ mutex_init(&backlight_dev_list_mutex);
+ BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
+
+ return 0;
+}
+
+/*
+ * if this is compiled into the kernel, we need to ensure that the
+ * class is registered before users of the class try to register lcd's
+ */
+postcore_initcall(backlight_class_init);
+module_exit(backlight_class_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
+MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction");