/* * 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> #include <linux/slab.h> #include <linux/module.h> struct adp5520_bl { struct device *master; struct adp5520_backlight_platform_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, ADP5520_BL_CONTROL, ADP5520_BL_AUTO_ADJ); ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness); } else { /* * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust * restore daylight l3 sysfs brightness */ ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, data->cached_daylight_max); ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL, ADP5520_BL_AUTO_ADJ); } } else { ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness); } if (data->current_brightness && brightness == 0) ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS, ADP5520_DIM_EN); else if (data->current_brightness == 0 && brightness) ret |= adp5520_clr_bits(master, ADP5520_MODE_STATUS, ADP5520_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, ADP5520_BL_VALUE, ®_val); return error ? data->current_brightness : reg_val; } static const 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_platform_data *pdata = data->pdata; int ret = 0; ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, pdata->l1_daylight_max); ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM, pdata->l1_daylight_dim); if (pdata->en_ambl_sens) { data->cached_daylight_max = pdata->l1_daylight_max; ret |= adp5520_write(master, ADP5520_OFFICE_MAX, pdata->l2_office_max); ret |= adp5520_write(master, ADP5520_OFFICE_DIM, pdata->l2_office_dim); ret |= adp5520_write(master, ADP5520_DARK_MAX, pdata->l3_dark_max); ret |= adp5520_write(master, ADP5520_DARK_DIM, pdata->l3_dark_dim); ret |= adp5520_write(master, ADP5520_L2_TRIP, pdata->l2_trip); ret |= adp5520_write(master, ADP5520_L2_HYS, pdata->l2_hyst); ret |= adp5520_write(master, ADP5520_L3_TRIP, pdata->l3_trip); ret |= adp5520_write(master, ADP5520_L3_HYS, pdata->l3_hyst); ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG, ALS_CMPR_CFG_VAL(pdata->abml_filt, ADP5520_L3_EN)); } ret |= adp5520_write(master, ADP5520_BL_CONTROL, BL_CTRL_VAL(pdata->fade_led_law, pdata->en_ambl_sens)); ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in, pdata->fade_out)); ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS, ADP5520_BL_EN | ADP5520_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 ret; uint8_t reg_val; mutex_lock(&data->lock); ret = adp5520_read(data->master, reg, ®_val); mutex_unlock(&data->lock); if (ret < 0) return ret; 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 = kstrtoul(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, ADP5520_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, ADP5520_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, ADP5520_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, ADP5520_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, ADP5520_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); int ret; ret = kstrtoul(buf, 10, &data->cached_daylight_max); if (ret < 0) return ret; return adp5520_store(dev, buf, count, ADP5520_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, ADP5520_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, ADP5520_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, ADP5520_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, ADP5520_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, ADP5520_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, ADP5520_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 adp5520_bl_probe(struct platform_device *pdev) { struct backlight_properties props; struct backlight_device *bl; struct adp5520_bl *data; int ret = 0; data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); if (data == NULL) return -ENOMEM; data->master = pdev->dev.parent; data->pdata = dev_get_platdata(&pdev->dev); if (data->pdata == NULL) { dev_err(&pdev->dev, "missing platform data\n"); return -ENODEV; } data->id = pdev->id; data->current_brightness = 0; mutex_init(&data->lock); memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = ADP5020_MAX_BRIGHTNESS; bl = devm_backlight_device_register(&pdev->dev, pdev->name, data->master, data, &adp5520_bl_ops, &props); if (IS_ERR(bl)) { dev_err(&pdev->dev, "failed to register backlight\n"); return PTR_ERR(bl); } 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"); return ret; } platform_set_drvdata(pdev, bl); ret |= adp5520_bl_setup(bl); backlight_update_status(bl); return ret; } static int 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, ADP5520_MODE_STATUS, ADP5520_BL_EN); if (data->pdata->en_ambl_sens) sysfs_remove_group(&bl->dev.kobj, &adp5520_bl_attr_group); return 0; } #ifdef CONFIG_PM_SLEEP static int adp5520_bl_suspend(struct device *dev) { struct backlight_device *bl = dev_get_drvdata(dev); return adp5520_bl_set(bl, 0); } static int adp5520_bl_resume(struct device *dev) { struct backlight_device *bl = dev_get_drvdata(dev); backlight_update_status(bl); return 0; } #endif static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend, adp5520_bl_resume); static struct platform_driver adp5520_bl_driver = { .driver = { .name = "adp5520-backlight", .owner = THIS_MODULE, .pm = &adp5520_bl_pm_ops, }, .probe = adp5520_bl_probe, .remove = adp5520_bl_remove, }; module_platform_driver(adp5520_bl_driver); MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_DESCRIPTION("ADP5520(01) Backlight Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:adp5520-backlight");