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388 lines
10 KiB
388 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs |
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* |
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* Copyright 2009 Analog Devices Inc. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/fb.h> |
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#include <linux/backlight.h> |
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#include <linux/mfd/adp5520.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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struct adp5520_bl { |
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struct device *master; |
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struct adp5520_backlight_platform_data *pdata; |
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struct mutex lock; |
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unsigned long cached_daylight_max; |
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int id; |
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int current_brightness; |
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}; |
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static int adp5520_bl_set(struct backlight_device *bl, int brightness) |
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{ |
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struct adp5520_bl *data = bl_get_data(bl); |
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struct device *master = data->master; |
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int ret = 0; |
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if (data->pdata->en_ambl_sens) { |
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if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) { |
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/* Disable Ambient Light auto adjust */ |
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ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL, |
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ADP5520_BL_AUTO_ADJ); |
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, |
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brightness); |
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} else { |
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/* |
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* MAX_BRIGHTNESS -> Enable Ambient Light auto adjust |
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* restore daylight l3 sysfs brightness |
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*/ |
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, |
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data->cached_daylight_max); |
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ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL, |
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ADP5520_BL_AUTO_ADJ); |
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} |
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} else { |
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness); |
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} |
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if (data->current_brightness && brightness == 0) |
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ret |= adp5520_set_bits(master, |
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ADP5520_MODE_STATUS, ADP5520_DIM_EN); |
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else if (data->current_brightness == 0 && brightness) |
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ret |= adp5520_clr_bits(master, |
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ADP5520_MODE_STATUS, ADP5520_DIM_EN); |
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if (!ret) |
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data->current_brightness = brightness; |
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return ret; |
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} |
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static int adp5520_bl_update_status(struct backlight_device *bl) |
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{ |
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return adp5520_bl_set(bl, backlight_get_brightness(bl)); |
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} |
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static int adp5520_bl_get_brightness(struct backlight_device *bl) |
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{ |
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struct adp5520_bl *data = bl_get_data(bl); |
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int error; |
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uint8_t reg_val; |
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error = adp5520_read(data->master, ADP5520_BL_VALUE, ®_val); |
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return error ? data->current_brightness : reg_val; |
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} |
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static const struct backlight_ops adp5520_bl_ops = { |
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.update_status = adp5520_bl_update_status, |
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.get_brightness = adp5520_bl_get_brightness, |
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}; |
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static int adp5520_bl_setup(struct backlight_device *bl) |
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{ |
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struct adp5520_bl *data = bl_get_data(bl); |
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struct device *master = data->master; |
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struct adp5520_backlight_platform_data *pdata = data->pdata; |
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int ret = 0; |
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, |
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pdata->l1_daylight_max); |
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM, |
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pdata->l1_daylight_dim); |
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if (pdata->en_ambl_sens) { |
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data->cached_daylight_max = pdata->l1_daylight_max; |
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ret |= adp5520_write(master, ADP5520_OFFICE_MAX, |
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pdata->l2_office_max); |
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ret |= adp5520_write(master, ADP5520_OFFICE_DIM, |
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pdata->l2_office_dim); |
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ret |= adp5520_write(master, ADP5520_DARK_MAX, |
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pdata->l3_dark_max); |
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ret |= adp5520_write(master, ADP5520_DARK_DIM, |
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pdata->l3_dark_dim); |
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ret |= adp5520_write(master, ADP5520_L2_TRIP, |
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pdata->l2_trip); |
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ret |= adp5520_write(master, ADP5520_L2_HYS, |
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pdata->l2_hyst); |
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ret |= adp5520_write(master, ADP5520_L3_TRIP, |
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pdata->l3_trip); |
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ret |= adp5520_write(master, ADP5520_L3_HYS, |
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pdata->l3_hyst); |
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ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG, |
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ALS_CMPR_CFG_VAL(pdata->abml_filt, |
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ADP5520_L3_EN)); |
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} |
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ret |= adp5520_write(master, ADP5520_BL_CONTROL, |
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BL_CTRL_VAL(pdata->fade_led_law, |
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pdata->en_ambl_sens)); |
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ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in, |
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pdata->fade_out)); |
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ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS, |
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ADP5520_BL_EN | ADP5520_DIM_EN); |
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return ret; |
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} |
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static ssize_t adp5520_show(struct device *dev, char *buf, int reg) |
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{ |
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struct adp5520_bl *data = dev_get_drvdata(dev); |
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int ret; |
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uint8_t reg_val; |
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mutex_lock(&data->lock); |
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ret = adp5520_read(data->master, reg, ®_val); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%u\n", reg_val); |
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} |
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static ssize_t adp5520_store(struct device *dev, const char *buf, |
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size_t count, int reg) |
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{ |
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struct adp5520_bl *data = dev_get_drvdata(dev); |
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unsigned long val; |
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int ret; |
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ret = kstrtoul(buf, 10, &val); |
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if (ret) |
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return ret; |
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mutex_lock(&data->lock); |
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adp5520_write(data->master, reg, val); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t adp5520_bl_dark_max_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return adp5520_show(dev, buf, ADP5520_DARK_MAX); |
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} |
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static ssize_t adp5520_bl_dark_max_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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return adp5520_store(dev, buf, count, ADP5520_DARK_MAX); |
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} |
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static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show, |
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adp5520_bl_dark_max_store); |
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static ssize_t adp5520_bl_office_max_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return adp5520_show(dev, buf, ADP5520_OFFICE_MAX); |
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} |
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static ssize_t adp5520_bl_office_max_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX); |
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} |
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static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show, |
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adp5520_bl_office_max_store); |
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static ssize_t adp5520_bl_daylight_max_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX); |
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} |
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static ssize_t adp5520_bl_daylight_max_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct adp5520_bl *data = dev_get_drvdata(dev); |
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int ret; |
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ret = kstrtoul(buf, 10, &data->cached_daylight_max); |
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if (ret < 0) |
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return ret; |
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return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX); |
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} |
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static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show, |
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adp5520_bl_daylight_max_store); |
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static ssize_t adp5520_bl_dark_dim_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return adp5520_show(dev, buf, ADP5520_DARK_DIM); |
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} |
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static ssize_t adp5520_bl_dark_dim_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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return adp5520_store(dev, buf, count, ADP5520_DARK_DIM); |
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} |
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static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show, |
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adp5520_bl_dark_dim_store); |
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static ssize_t adp5520_bl_office_dim_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return adp5520_show(dev, buf, ADP5520_OFFICE_DIM); |
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} |
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static ssize_t adp5520_bl_office_dim_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM); |
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} |
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static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show, |
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adp5520_bl_office_dim_store); |
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static ssize_t adp5520_bl_daylight_dim_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM); |
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} |
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static ssize_t adp5520_bl_daylight_dim_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM); |
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} |
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static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show, |
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adp5520_bl_daylight_dim_store); |
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static struct attribute *adp5520_bl_attributes[] = { |
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&dev_attr_dark_max.attr, |
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&dev_attr_dark_dim.attr, |
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&dev_attr_office_max.attr, |
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&dev_attr_office_dim.attr, |
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&dev_attr_daylight_max.attr, |
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&dev_attr_daylight_dim.attr, |
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NULL |
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}; |
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static const struct attribute_group adp5520_bl_attr_group = { |
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.attrs = adp5520_bl_attributes, |
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}; |
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static int adp5520_bl_probe(struct platform_device *pdev) |
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{ |
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struct backlight_properties props; |
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struct backlight_device *bl; |
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struct adp5520_bl *data; |
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int ret = 0; |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (data == NULL) |
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return -ENOMEM; |
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data->master = pdev->dev.parent; |
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data->pdata = dev_get_platdata(&pdev->dev); |
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if (data->pdata == NULL) { |
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dev_err(&pdev->dev, "missing platform data\n"); |
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return -ENODEV; |
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} |
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data->id = pdev->id; |
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data->current_brightness = 0; |
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mutex_init(&data->lock); |
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memset(&props, 0, sizeof(struct backlight_properties)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = ADP5020_MAX_BRIGHTNESS; |
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bl = devm_backlight_device_register(&pdev->dev, pdev->name, |
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data->master, data, &adp5520_bl_ops, |
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&props); |
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if (IS_ERR(bl)) { |
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dev_err(&pdev->dev, "failed to register backlight\n"); |
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return PTR_ERR(bl); |
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} |
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bl->props.brightness = ADP5020_MAX_BRIGHTNESS; |
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if (data->pdata->en_ambl_sens) |
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ret = sysfs_create_group(&bl->dev.kobj, |
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&adp5520_bl_attr_group); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to register sysfs\n"); |
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return ret; |
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} |
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platform_set_drvdata(pdev, bl); |
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ret = adp5520_bl_setup(bl); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to setup\n"); |
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if (data->pdata->en_ambl_sens) |
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sysfs_remove_group(&bl->dev.kobj, |
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&adp5520_bl_attr_group); |
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return ret; |
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} |
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backlight_update_status(bl); |
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return 0; |
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} |
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static int adp5520_bl_remove(struct platform_device *pdev) |
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{ |
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struct backlight_device *bl = platform_get_drvdata(pdev); |
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struct adp5520_bl *data = bl_get_data(bl); |
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adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN); |
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if (data->pdata->en_ambl_sens) |
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sysfs_remove_group(&bl->dev.kobj, |
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&adp5520_bl_attr_group); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int adp5520_bl_suspend(struct device *dev) |
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{ |
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struct backlight_device *bl = dev_get_drvdata(dev); |
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return adp5520_bl_set(bl, 0); |
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} |
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static int adp5520_bl_resume(struct device *dev) |
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{ |
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struct backlight_device *bl = dev_get_drvdata(dev); |
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backlight_update_status(bl); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend, |
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adp5520_bl_resume); |
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static struct platform_driver adp5520_bl_driver = { |
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.driver = { |
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.name = "adp5520-backlight", |
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.pm = &adp5520_bl_pm_ops, |
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}, |
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.probe = adp5520_bl_probe, |
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.remove = adp5520_bl_remove, |
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}; |
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module_platform_driver(adp5520_bl_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("ADP5520(01) Backlight Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:adp5520-backlight");
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