diff options
Diffstat (limited to 'drivers/video/backlight/adp5520_bl.c')
| -rw-r--r-- | drivers/video/backlight/adp5520_bl.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c new file mode 100644 index 000000000..35373e206 --- /dev/null +++ b/drivers/video/backlight/adp5520_bl.c @@ -0,0 +1,397 @@ +/* + * 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); + if (ret) { + dev_err(&pdev->dev, "failed to setup\n"); + if (data->pdata->en_ambl_sens) + sysfs_remove_group(&bl->dev.kobj, + &adp5520_bl_attr_group); + return ret; + } + + backlight_update_status(bl); + + return 0; +} + +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", + .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"); |