--- /dev/null
+/*
+ * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/mfd/adp5520.h>
+
+struct adp5520_bl {
+ struct device *master;
+ struct adp5520_backlight_platfrom_data *pdata;
+ struct mutex lock;
+ unsigned long cached_daylight_max;
+ int id;
+ int current_brightness;
+};
+
+static int adp5520_bl_set(struct backlight_device *bl, int brightness)
+{
+ struct adp5520_bl *data = bl_get_data(bl);
+ struct device *master = data->master;
+ int ret = 0;
+
+ if (data->pdata->en_ambl_sens) {
+ if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
+ /* Disable Ambient Light auto adjust */
+ ret |= adp5520_clr_bits(master, BL_CONTROL,
+ BL_AUTO_ADJ);
+ ret |= adp5520_write(master, DAYLIGHT_MAX, brightness);
+ } else {
+ /*
+ * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
+ * restore daylight l3 sysfs brightness
+ */
+ ret |= adp5520_write(master, DAYLIGHT_MAX,
+ data->cached_daylight_max);
+ ret |= adp5520_set_bits(master, BL_CONTROL,
+ BL_AUTO_ADJ);
+ }
+ } else {
+ ret |= adp5520_write(master, DAYLIGHT_MAX, brightness);
+ }
+
+ if (data->current_brightness && brightness == 0)
+ ret |= adp5520_set_bits(master,
+ MODE_STATUS, DIM_EN);
+ else if (data->current_brightness == 0 && brightness)
+ ret |= adp5520_clr_bits(master,
+ MODE_STATUS, DIM_EN);
+
+ if (!ret)
+ data->current_brightness = brightness;
+
+ return ret;
+}
+
+static int adp5520_bl_update_status(struct backlight_device *bl)
+{
+ int brightness = bl->props.brightness;
+ if (bl->props.power != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ return adp5520_bl_set(bl, brightness);
+}
+
+static int adp5520_bl_get_brightness(struct backlight_device *bl)
+{
+ struct adp5520_bl *data = bl_get_data(bl);
+ int error;
+ uint8_t reg_val;
+
+ error = adp5520_read(data->master, BL_VALUE, ®_val);
+
+ return error ? data->current_brightness : reg_val;
+}
+
+static struct backlight_ops adp5520_bl_ops = {
+ .update_status = adp5520_bl_update_status,
+ .get_brightness = adp5520_bl_get_brightness,
+};
+
+static int adp5520_bl_setup(struct backlight_device *bl)
+{
+ struct adp5520_bl *data = bl_get_data(bl);
+ struct device *master = data->master;
+ struct adp5520_backlight_platfrom_data *pdata = data->pdata;
+ int ret = 0;
+
+ ret |= adp5520_write(master, DAYLIGHT_MAX, pdata->l1_daylight_max);
+ ret |= adp5520_write(master, DAYLIGHT_DIM, pdata->l1_daylight_dim);
+
+ if (pdata->en_ambl_sens) {
+ data->cached_daylight_max = pdata->l1_daylight_max;
+ ret |= adp5520_write(master, OFFICE_MAX, pdata->l2_office_max);
+ ret |= adp5520_write(master, OFFICE_DIM, pdata->l2_office_dim);
+ ret |= adp5520_write(master, DARK_MAX, pdata->l3_dark_max);
+ ret |= adp5520_write(master, DARK_DIM, pdata->l3_dark_dim);
+ ret |= adp5520_write(master, L2_TRIP, pdata->l2_trip);
+ ret |= adp5520_write(master, L2_HYS, pdata->l2_hyst);
+ ret |= adp5520_write(master, L3_TRIP, pdata->l3_trip);
+ ret |= adp5520_write(master, L3_HYS, pdata->l3_hyst);
+ ret |= adp5520_write(master, ALS_CMPR_CFG,
+ ALS_CMPR_CFG_VAL(pdata->abml_filt, L3_EN));
+ }
+
+ ret |= adp5520_write(master, BL_CONTROL,
+ BL_CTRL_VAL(pdata->fade_led_law, pdata->en_ambl_sens));
+
+ ret |= adp5520_write(master, BL_FADE, FADE_VAL(pdata->fade_in,
+ pdata->fade_out));
+
+ ret |= adp5520_set_bits(master, MODE_STATUS, BL_EN | DIM_EN);
+
+ return ret;
+}
+
+static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
+{
+ struct adp5520_bl *data = dev_get_drvdata(dev);
+ int error;
+ uint8_t reg_val;
+
+ mutex_lock(&data->lock);
+ error = adp5520_read(data->master, reg, ®_val);
+ mutex_unlock(&data->lock);
+
+ return sprintf(buf, "%u\n", reg_val);
+}
+
+static ssize_t adp5520_store(struct device *dev, const char *buf,
+ size_t count, int reg)
+{
+ struct adp5520_bl *data = dev_get_drvdata(dev);
+ unsigned long val;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&data->lock);
+ adp5520_write(data->master, reg, val);
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static ssize_t adp5520_bl_dark_max_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return adp5520_show(dev, buf, DARK_MAX);
+}
+
+static ssize_t adp5520_bl_dark_max_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ return adp5520_store(dev, buf, count, DARK_MAX);
+}
+static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
+ adp5520_bl_dark_max_store);
+
+static ssize_t adp5520_bl_office_max_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return adp5520_show(dev, buf, OFFICE_MAX);
+}
+
+static ssize_t adp5520_bl_office_max_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ return adp5520_store(dev, buf, count, OFFICE_MAX);
+}
+static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
+ adp5520_bl_office_max_store);
+
+static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return adp5520_show(dev, buf, DAYLIGHT_MAX);
+}
+
+static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct adp5520_bl *data = dev_get_drvdata(dev);
+
+ strict_strtoul(buf, 10, &data->cached_daylight_max);
+ return adp5520_store(dev, buf, count, DAYLIGHT_MAX);
+}
+static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
+ adp5520_bl_daylight_max_store);
+
+static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return adp5520_show(dev, buf, DARK_DIM);
+}
+
+static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ return adp5520_store(dev, buf, count, DARK_DIM);
+}
+static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
+ adp5520_bl_dark_dim_store);
+
+static ssize_t adp5520_bl_office_dim_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return adp5520_show(dev, buf, OFFICE_DIM);
+}
+
+static ssize_t adp5520_bl_office_dim_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ return adp5520_store(dev, buf, count, OFFICE_DIM);
+}
+static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
+ adp5520_bl_office_dim_store);
+
+static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return adp5520_show(dev, buf, DAYLIGHT_DIM);
+}
+
+static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ return adp5520_store(dev, buf, count, DAYLIGHT_DIM);
+}
+static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
+ adp5520_bl_daylight_dim_store);
+
+static struct attribute *adp5520_bl_attributes[] = {
+ &dev_attr_dark_max.attr,
+ &dev_attr_dark_dim.attr,
+ &dev_attr_office_max.attr,
+ &dev_attr_office_dim.attr,
+ &dev_attr_daylight_max.attr,
+ &dev_attr_daylight_dim.attr,
+ NULL
+};
+
+static const struct attribute_group adp5520_bl_attr_group = {
+ .attrs = adp5520_bl_attributes,
+};
+
+static int __devinit adp5520_bl_probe(struct platform_device *pdev)
+{
+ struct backlight_device *bl;
+ struct adp5520_bl *data;
+ int ret = 0;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ data->master = pdev->dev.parent;
+ data->pdata = pdev->dev.platform_data;
+
+ if (data->pdata == NULL) {
+ dev_err(&pdev->dev, "missing platform data\n");
+ kfree(data);
+ return -ENODEV;
+ }
+
+ data->id = pdev->id;
+ data->current_brightness = 0;
+
+ mutex_init(&data->lock);
+
+ bl = backlight_device_register(pdev->name, data->master,
+ data, &adp5520_bl_ops);
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "failed to register backlight\n");
+ kfree(data);
+ return PTR_ERR(bl);
+ }
+
+ bl->props.max_brightness =
+ bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
+
+ if (data->pdata->en_ambl_sens)
+ ret = sysfs_create_group(&bl->dev.kobj,
+ &adp5520_bl_attr_group);
+
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register sysfs\n");
+ backlight_device_unregister(bl);
+ kfree(data);
+ }
+
+ platform_set_drvdata(pdev, bl);
+ ret |= adp5520_bl_setup(bl);
+ backlight_update_status(bl);
+
+ return ret;
+}
+
+static int __devexit adp5520_bl_remove(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct adp5520_bl *data = bl_get_data(bl);
+
+ adp5520_clr_bits(data->master, MODE_STATUS, BL_EN);
+
+ if (data->pdata->en_ambl_sens)
+ sysfs_remove_group(&bl->dev.kobj,
+ &adp5520_bl_attr_group);
+
+ backlight_device_unregister(bl);
+ kfree(data);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int adp5520_bl_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ return adp5520_bl_set(bl, 0);
+}
+
+static int adp5520_bl_resume(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+
+ backlight_update_status(bl);
+ return 0;
+}
+#else
+#define adp5520_bl_suspend NULL
+#define adp5520_bl_resume NULL
+#endif
+
+static struct platform_driver adp5520_bl_driver = {
+ .driver = {
+ .name = "adp5520-backlight",
+ .owner = THIS_MODULE,
+ },
+ .probe = adp5520_bl_probe,
+ .remove = __devexit_p(adp5520_bl_remove),
+ .suspend = adp5520_bl_suspend,
+ .resume = adp5520_bl_resume,
+};
+
+static int __init adp5520_bl_init(void)
+{
+ return platform_driver_register(&adp5520_bl_driver);
+}
+module_init(adp5520_bl_init);
+
+static void __exit adp5520_bl_exit(void)
+{
+ platform_driver_unregister(&adp5520_bl_driver);
+}
+module_exit(adp5520_bl_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-backlight");
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